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JPH0420863

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DESCRIPTION JPH0420863
[0001]
A. Industrial Field of Application The present invention relates to a rotation detection device
useful for use in a so-called headphone-based electroacoustic transducer, a portable video
camera device, and the like. SUMMARY OF THE INVENTION According to the present invention,
a longitudinal center position 1 of a bimorph plate having a plurality of electrodes polarized and
formed on both sides of a longitudinal central position is fixed to a rotating member which is
rotationally moved together with an object to be rotated. By connecting the electrodes so that the
electromotive forces generated by the curvature of the bimorph plate generated by the rotation
of the rotating member are added to each other, the rotation can be favorably detected while
being easy to manufacture, so-called headphones It is an object of the present invention to
provide a rotation detection device that is useful for the used electro-acoustic transducer, a
portable video camera device, etc. Furthermore, the present invention improves the sensitivity of
rotation detection by providing a connecting member that connects one end and the other end of
the bimorph plate so as to extend between the one end and the other end in the above-described
rotation detection device. It is C6 Conventional Technology Conventionally, using a so-called
headphone device in which a pair of small electro-acoustic transducers are attached and
supported in the vicinity of both auricles, a natural listening feeling as if sound waves propagate
from the outside In order to realize sound reproduction to be given, so-called hinaural directions
have been proposed. This Hinaural method applies a predetermined phase conversion and signal
response transformation to the right channel signal that is originally reproduced only by the
right side electro-acoustic transducer, and supplies it to the left side electro-acoustic transducer,
The right channel signal reproduced only by the acoustic converter is subjected to predetermined
phase conversion and signal-rechel type conversion to be supplied to the right electro-acoustic
converter. In such a Hinaural method, although a good sense of out-of-head localization can be
realized for the sound propagating from the side and the back, it is difficult to achieve a good
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feeling of out-of-head localization for the sound propagating from the front Met. Then, in this
Hinaural method, as described in Japanese Patent Publication No. 54-19242, detection of
rotational movement of the head is performed, and phase conversion and signal are performed in
response to the detected rotational movement of the head. It has been proposed that good out-ofhead localization can be realized for sound propagating from the front by changing the constant
of the learning transformation. In addition, in a portable video camera device, detection of
rotational movement of the video camera device is performed, and predetermined signal
processing is performed on the video signal in response to the detected rotational movement of
the video camera device. It has been proposed that the fluctuation of the image due to the shake
can be corrected.
It should be noted that since such camera shake is a repetitive rotation in the horizontal direction
in a low frequency band of a predetermined frequency of 5 to 100 H 2 or less, if the rotational
movement of the video camera device is frequency-sorted and detected Can correct the influence
of camera shake well. Therefore, conventionally, a rotation detection device has been proposed
which detects rotational movement of a rotation detection object such as a head, for use in an
electro-acoustic conversion device using a hinaural method, a video camera device for portable
use, and the like. That is, in Japanese Patent Publication No. 54-19242, a distance measuring
device comprising a cylinder portion and a piston portion slidably fitted to each other is used,
and one end side of this distance measuring device is one end of the piston on the shoulder of
the user. A device is described which detects the rotational movement of the head of the user
relative to the shoulder of the user by mounting the side and the other end on the head of the
user. There is. Further, this Japanese Patent Publication No. 54-19242 discloses a device in
which a so-called gyroscope device is attached to the head of a user to detect rotational
movement of the head of the user. A rotation detection device configured using such a distance
measuring device or a gyroscope is difficult to miniaturize the device configuration, and, despite
being expensive, it accurately corrects rotational movement such as minute vibration. Can not be
detected. In addition, in the rotation detection apparatus using the said gyroscope, a magnetic
needle can be used instead of this gyroscope. However, in a rotation detection device configured
using a magnetic needle, the response of detection is poor, and accurate rotational movement
detection can not be performed. In addition, the applicant has previously used a sound source
indicating a reference position, and measures the distance to the sound source to detect
rotational movement of the head of the user. We propose a detection device. That is, the rotation
detection device includes a pair of microphone devices attached to the left and right sides of the
head of the user, and detects the phase of the detection sound emitted from the sound source
using the microphone devices. The distance from the sound source to the left and right sides of
the user's head is detected. In this rotation detection device, the rotational movement of the head
of the user is summerized based on the change in the distance from the sound source to the left
and right sides of the head of the user. As described above, it is difficult to miniaturize the
rotation detection device configured using the sound source indicating the reference position so
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as to include the sound source and be portable.
Therefore, this rotation detection device can not be configured to be used outdoors or the like.
Furthermore, in Japanese Patent Application Laid-Open No. 63-272300, there is described a
rotation detection device configured using a pair of bimorph plates. The bimorph plate is formed,
for example, by laminating a metal plate on a piezoelectric ceramic, and is configured to generate
an electromotive force by being bent. In this rotation detecting device, the pair of bimorph plates
are attached at a position between the paths of a rotating member which is rotationally moved
along with the object to be rotated at each of the end sides and supported in a cantilever manner.
And each of these bimorph boards is making the other end side which becomes a free end side
extend in the opposite direction which mutually faces. The electrodes of these bimorph plates are
produced by the curvatures of the respective bimorph plates caused by the rotation of the
rotating member, that is, the curvatures such that the free ends of the respective bimorph plates
displace in the same rotational direction with respect to the rotating member. The electromotive
forces are connected so as to be added to each other. In this rotation detecting device, when the
rotating member performs rotational movement, the bimorph plates are curved in response to
the angular acceleration of the rotational movement, and an electromotive force can be obtained
according to the curvature. That is, in this rotation detection device, the rotation speed and the
rotation angle position of the detected rotation object can be calculated based on the
electromotive force. In this rotation detection device, when the rotating member moves in
parallel with the object to be rotated, the free ends of the bimorph plates are displaced in
mutually opposite rotational directions with respect to the rotating member. Create a curvature
that At this time, since the electromotive forces generated by these bimorph plates cancel each
other, only rotational movement components that are not affected by the parallel movement
components of the above-mentioned rotating member are detected. Problem to be Solved by the
Invention D1 By the way, in the rotation detection device configured by using a pair of bimorph
plates as described above, it is necessary to make the electromotive force characteristics of each
bimorph plate equal to each other. If the electromotive force characteristics of the bimorph
plates are different from each other, the electromotive forces generated in the bimorph plates
can not be offset each other by the parallel movement of the rotating members, so that the
rotational movement component of the rotating members can not be accurately detected. Since it
is difficult to manufacture such a plurality of bimorph plates having the same electromotive force
characteristics, it is necessary to perform sorting or the like based on the electromotive force
characteristics of the bimorph plates when manufacturing this rotation detection device.
Manufacturing becomes complicated.
In addition, in this rotation detection device, since it is necessary to connect the electrodes of
each bimorph plate after the bimorph plates are attached to the rotating member, manufacturing
is complicated. Furthermore, in this rotation detection device, since each of the bimorph plates is
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supported at one end thereof in a cantilever manner with respect to the rotating member, one
end of each of the bimorph plates is given, for example, when an impact is applied from the
outside. There is a possibility that the breakage on the side or the detachment from the abovementioned rotating member may occur. And in this rotation detection apparatus, it is difficult to
make low frequency cutoff frequency about detection of rotation movement lower so that
rotation movement of low frequency can be detected. Further, in this rotation detection device,
the bimorph plate does not produce a curve larger than the amount of bending determined
according to the mass of the bimorph plate when the rotating member is rotated, so that the
detection sensitivity of the rotational movement It is difficult to improve Therefore, in view of the
above-mentioned situation, the present invention is to be made easy, and has a good durability
against shocks and the like, and a wide frequency band including a low frequency band. It is an
object of the present invention to provide a rotation detection device capable of detecting the
rotational movement of an object to be rotated with high accuracy and accuracy. In order to
solve the above-mentioned problems and achieve the above object, the rotation detection device
according to the present invention has its longitudinal center position fixed to a rotating member
that is rotationally moved together with the detected rotation object. A bimorph plate and a
plurality of electrodes formed on the bimorph plate and polarized on both sides in the
longitudinal center of the bimorph plate, each of the electrodes comprising the bimorph plate
produced by the rotation of the rotating member The electromotive forces generated by the
bending are connected so as to be added to each other. Further, in the rotation detection device
according to the present invention, in the above-described rotation detection device, the bimorph
plate is provided so as to extend between one end side and the other end side, and includes a
connecting member connecting the one end side and the other end side. It will be F3 Operation
In the rotation detecting device according to the present invention, since the bimorph plate is
fixed at its longitudinal center position to the rotating member that is rotationally moved with the
object to be rotated, one end of the bimorph plate is rotated by rotating the rotating member. The
side and the other end are curved in the same rotational direction with respect to the rotating
member. Then, the plurality of electrodes formed on the bimorph plate on both sides of the
longitudinal center position of the bimorph plate are added with each other by the electromotive
force generated by the curvature of the bimorph plate generated by the rotation of the rotating
member. Thus, an electromotive force corresponding to each rotational speed of the rotating
member can be obtained.
Further, since the plurality of electrodes are formed on the same bimorph plate, the connection
between the electrodes is simplified and the connection for increasing the electric capacity
between the terminals for taking out the electromotive force is facilitated. It can be carried out.
And, in this rotation detecting device, when a connecting member for connecting one end side
and the other end side is provided so as to extend between the one end side and the other end
side of the bimorph plate, according to the mass of the connection member The amount of
bending of the bimorph plate per rotational angular velocity of the rotary member is increased,
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and the detection sensitivity of the rotational movement is improved. G. Examples Hereinafter,
specific examples of the present invention will be described with reference to the drawings. The
rotation detection device according to the present invention is, for example, a device that detects
a rotational angular acceleration of a rotation detection object such as the head of a user. As
shown in FIG. 1, this rotation detection device is configured to have a bimorph plate 1. The
bimorph plate 1 is configured by bonding a pair of first and second monomorph plates la and Ib
sandwiching a common terminal plate 2 made of a thin metal plate. Each of the monomorph
plates 1a and 1b is, for example, a piezoelectric ceramic. It is configured to generate an
electromotive force between one surface side and the other surface side by being curved in the
thickness direction. The above first monomorph board! The poling direction of a is a direction
from the side of the common terminal plate 2 toward the surface side which is one surface side
of the bimorph plate 1 as shown by arrows A and B in FIG. The poling direction of the second
monomorph plate 1b is the same as that of the first monomorph plate 1a, that is, as shown by
the arrow C and the arrow in FIG. The direction is from the front surface side to the common
terminal board 2 side. As shown in FIGS. 1 and 2, on each surface of the bimorph plate 1, a
plurality of electrodes each made of a conductive thin film are deposited. That is, on the surface
portion of the first monomorph plate 1a which is one surface side of the bimorph plate 1, the
first and second electrodes 3.4 are formed so as to be polarized on both sides in the longitudinal
center position. There is. Further, on the surface portion of the second monomorph plate 1b
which is another example of the bimorph plate 1, third and fourth electrodes 5 and 6 are formed
polarized on both sides in the longitudinal center position. ing. The bimorph plate I is fixed and
supported at a longitudinal center position on the rotating member 7 which is rotationally moved
together with the object to be rotated. The rotating member 7 has a proximal end portion 7b
adapted to be attached to the object to be rotated and the holding portion 7a connected to the
distal end side of the proximal end portion.
The holding portion 7a is formed in a substantially cylindrical shape, and by providing the
holding groove portion 8 having a width substantially equal to the thickness of the bimorph plate
1, the tip end side is bifurcated. The bimorph plate 1 is supported by the holding portion 7a such
that the longitudinal center portion is inserted into the holding groove portion 8 so that the
longitudinal direction is substantially orthogonal to the axis of the holding portion 7a. The
electrodes 3.4 and 5.6 are connected such that electromotive forces generated by the curvature
of the bimorph plate 1 generated by the rotation of the rotating member 7 shown in FIGS. 3 and
4 are added to each other. There is. That is, the first electrode 3 and the third electrode 5 are
connected to the first voltage lead-out terminal 9. The second electrode 4 and the fourth
electrode 6 are connected to a second voltage output terminal 10. The rotation detection device
according to the present invention configured as described above detects a rotational angular
acceleration around the axis of the holding portion 7a indicated by the arrow R in FIG. 1 of the
rotation detection object. That is, in this rotation detecting device, as shown in FIG. 3, when the
rotating member 7 starts to be rotated in the first direction shown by the arrow R1 in FIG. 3,
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both ends of the bimorph plate 1 are inertial Thus, as shown by arrows X1 and X2 respectively in
FIG. 3, they are curved so as to be rotated in a second direction opposite to the first direction. At
this time, portions in the vicinity of the first electrode 3 and the fourth electrode 6 are displaced
so as to be compressed as indicated by arrows S in FIG. Further, portions in the vicinity of the
second electrode 4 and the third electrode 5 are displaced so as to be extended as shown by
arrows l in FIG. 3, respectively. Therefore, a negative potential is generated at the first voltage
output terminal 9 and a positive potential is generated at the second voltage output terminal 10.
Then, in the rotation detecting device, as shown in FIG. 4, when the rotating member 7 starts to
be rotated in the second direction indicated by the arrow R2 in FIG. Thus, as shown by arrows Y1
and Y2 in FIG. 4 respectively, they are curved so as to be rotated in a first direction which is the
opposite direction of the second direction. At this time, portions in the vicinity of the first
electrode 3 and the fourth electrode 6 are arrows in FIG. 4 respectively. It is displaced as it is
stretched. Further, the portions in the vicinity of the second electrode 4 and the third electrode 5
are displaced so as to be compressed as indicated by arrows S in FIG. 4 respectively. A positive
potential is generated at the terminal 9, and a negative potential is generated at the second
voltage output terminal IO.
In this manner, the voltage extracted from the first and second voltage extracting terminals 9 and
10 is a rotational angular acceleration about the axis of the holding portion 7a of the rotating
member 7, that is, the rotational object It corresponds to the rotational angular acceleration
about the axis. When this rotation detection device is shown by an equivalent circuit, as shown in
FIG. 7A, first and third capacitors C, C are connected in parallel to the first voltage lead-out
terminal 9, and The second and fourth capacitors C, C connected in parallel to each other are
connected in series to C + and Cz, and the second voltage output terminal 10 is connected to
these capacitors C2 and C4. It is in a state of being In this equivalent circuit, the first capacitor
C3 indicates the electric capacitance between the first electrode 3 and the common terminal
plate 2. Similarly, the second capacitor C 2 has an electric capacity between the second electrode
4 and the common terminal plate 2, the third capacitor C 34, the third electrode 5 and the
common terminal plate 2. The fourth capacitor C1 has the fourth electrode 6 and the first
capacitor C1! The electric capacitance with the terminal board 2 is shown, respectively. That is,
assuming that the capacitance of each of the capacitors c, C2, c, c is C, and the potential
difference stored in the capacitors CC2, C3, C- due to the curvature of the bimorph plate 1 is e, In
the rotation detecting device, the capacitance is C, and an electromotive force of 2e can be
obtained. The rotation detecting device according to the present invention is not limited to the
above-described embodiment, and as shown in FIG. 5, the poling directions of the monomorph
plates 1a and 1b may be configured to be opposite to each other. . That is, in this rotation
detection device, the poling direction of the first monomorph plate 1a is one surface of the
bimorph plate 1 from the side of the common terminal plate 2 as shown by arrows A and B in
FIG. The direction is toward the front side which is the side. The poling direction of the second
monomorph plate 1b is opposite to the poling direction of the first monomorph plate 1a, that is,
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as shown by arrows E and F in FIG. The direction is from the side of the I terminal Fi2 toward the
surface side which is the other surface side of the bimorph plate 1 described above. Also in this
rotation detection device, the electrodes 34.5.6 are connected such that electromotive forces
generated by the curvature of the bimorph plate 1 generated by the rotation of the rotating
member 7 shown in FIG. ing.
That is, the second electrode 4 and the third electrode 5 are connected to the first voltage leadout terminal 9. The first electrode 3 and the fourth electrode 6 are connected to a second voltage
output terminal 10. In the rotation detecting device according to the present invention
configured as described above, as shown in FIG. 6, when the rotating member 7 starts to be
rotated in the first direction shown by the arrow R8 in FIG. Both ends of I are curved so as to be
rotated by inertia in a second direction opposite to the first direction, as shown by arrows x1 and
x2 in FIG. 6, respectively. At this time, portions in the vicinity of the first electrode 3 and the
fourth electrode 6 are displaced so as to be compressed as shown by the arrows S in FIG. Further,
portions in the vicinity of the second electrode 4 and the third electrode 5 are arrows in FIG. It is
displaced as it is stretched. Therefore, a positive potential is generated at the first voltage output
terminal 9 and a negative potential is generated at the second voltage output terminal 10. Then,
in the rotation detecting device, when the rotating member 7 starts to be rotated in the second
direction, a negative potential is applied to the first voltage lead-out terminal 9 and to the second
voltage lead-out terminal 10. Each produces a positive potential. In this manner, also in this
rotation detection device, the voltage corresponding to the rotational angular acceleration
around the axis of the holding portion 7a of the object to be detected for rotation is obtained
from the first and second voltage lead terminals 9 and 10. It can be taken out. When this rotation
detection device is shown by an equivalent circuit, as shown in FIG. 7, second and third
capacitors C2 and C3 are connected in parallel to the first voltage lead-out terminal 9, and these
respective capacitors C, , C, are connected in series with first and fourth capacitors C, C, which
are connected in parallel with each other, and the second voltage output terminal 10 is
connected to each of the capacitors C, C. Is connected. In this equivalent circuit, the first to fourth
capacitors c, c, c, c, and c are the same as in the equivalent circuit shown in FIG. 7 shows the
electric capacitance between 4.5.6 and the common terminal board 2; That is, in this rotation
detection device, the electric capacity is C, and an electromotive force of 2e can be obtained.
Furthermore, as shown in FIG. 9, the rotation detection device according to the present invention
is configured such that the poling direction of each of the monomorph plates a and 1b is
opposite to each other on one end side and the other end side. You may
That is, in this rotation detection device, the poling direction of the first monomorph plate 1a is
indicated by an arrow A in FIG. 9 at one end side Q where the first electrode 3 is provided. (3) on
the other side of the common terminal plate 2 and on the other side where the second electrode
4 is provided. As shown by the arrow G, the direction from the surface side which is the one
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surface side of the bimorph plate 1 toward the common terminal plate 2 is made. The poling
direction of the second monomorph plate 1b is one surface side of the bimorph plate I at one end
side where the third electrode 5 is provided as shown by arrow C in FIG. At the other end side
where the fourth electrode 6 is provided, as shown by arrow F in FIG. The direction is from the
side toward the front surface side which is one surface side of the bimorph plate l. In this
rotation detection device, the electromotive force generated by the curvature of the bimorph
plate l generated by the rotation of the rotating member 7 shown in FIG. They are connected to
be added to each other. That is, the common terminal board 2 is connected to the first voltage
lead-out terminal 9. The first to fourth electrodes 3.4.5.6 are connected to the second voltage
output terminal 10. The first electrode 3 and the second electrode 4 are connected to each other
by a first connecting wire 11G. In this case, the first electrode 3 and the second electrode 4 may
be formed continuously with each other. Further, the third electrode 5 and the fourth electrode 6
are connected to each other by the second connecting wire 12. The third electrode 5 and the
fourth electrode 6 may be formed to be continuous with each other. In the rotation detecting
device according to the present invention configured as described above, as shown in the tenth
port, when the rotating member 7 starts to be rotated in the first direction indicated by the tenth
arrow R1, the bimorph plate Both ends of 1 are curved by inertia so as to be rotated in a second
direction opposite to the first direction, as indicated by the arrows χ and X2 in the tenth same
respectively. At this time, portions in the vicinity of the first electrode 3 and the fourth electrode
6 are displaced so as to be compressed as shown by the arrows S in FIG. Further, the portions in
the vicinity of the second electrode 4 and the third electrode 5 are displaced so as to be extended
as indicated by arrows i in FIG.
Therefore, a positive potential is stored in the first voltage lead-out terminal 9 and a negative
potential is stored in the second voltage lead-out terminal 10, respectively. Then, in the rotation
detecting device, when the rotating member 7 starts to be rotated in the second direction, a
negative potential is applied to the first voltage lead-out terminal 9 and to the second voltage
lead-out terminal 10. Each produces a positive potential. In this manner, also in this rotation
detection device, the voltage corresponding to the rotational angular acceleration around the axis
of the holding portion 7a of the object to be detected for rotation is obtained from the first and
second voltage lead terminals 9 and 10. It can be taken out. If this rotation detecting device is
shown by an equivalent circuit, as shown in FIG. 8, first to fourth capacitors C1, C2 and C3C4 are
connected in parallel to the first electron number output terminal 9, The second voltage output
terminal 10 is connected to the capacitors CCz, C3 and Ca. In this equivalent circuit, the first to
fourth capacitors Ccz C3, C are the same as in the equivalent circuit shown in FIG. 7i, the first to
fourth electrodes 3.4.5.6. And the common terminal plate 2 are indicated by L7. That is, in this
rotation detection device, the electric capacity is 40 and an electromotive force of e can be
obtained. In this rotation detection device, when connection is made to increase the electric
capacitance between the first and second voltage lead terminals 9 and 10 as described above, the
low cutoff frequency for detection of rotational movement is lowered. It is possible to accurately
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detect rotational movement of a wide frequency band including a low frequency band. In the
rotation detecting device according to the present invention, as shown in FIG. 11, the poling
direction of each monomorph plate + a, Ib or the one end and the other end face each other, and
each monomorph plate 1alb The directions of polling may be configured to be opposite to each
other. That is, in this rotation detecting device, the poling direction of the first monomorph plate
a is, as shown by an arrow A in FIG. 11, at one end side where the first electrode 3 is provided.
The direction from the side of the common terminal plate 2 toward the surface side which is one
surface side of the bimorph plate 1 is made, and the other end side provided with the second
electrode 4 has an arrow G in 1111. As shown, the direction from the surface side which is one
surface side of the bimorph plate 1 toward the common terminal plate 2 is set.
The poling direction of the second monomorph plate 1b is, as shown by an arrow E in FIG. 11,
from the side of the common terminal plate 2 on one end side where the third electrode 5 is
provided. As shown by arrow H in FIG. 11, the other side of the bimorph plate 1 is a direction
toward the surface side which is one surface side of the bimorph plate 1, and as shown by arrow
H in FIG. The direction is from the front surface side to the common terminal board 2 side. In this
rotation detecting device, the respective electrodes 3.54 are connected such that electromotive
forces generated by the bending of the bimorph plate 1 generated by the rotation of the rotating
member 7 shown in FIG. ing. That is, the third electrode 5 and the fourth electrode 6 are
connected to the first voltage extraction terminal 9. The first electrode 3 and the second
electrode 4 are connected to the second voltage output terminal 10. The first electrode 3 and the
second electrode 4 are connected to each other by a first connecting wire 11. In this case, the
first electrode 3 and the second electrode 4 may be formed continuously with each other.
Further, the third current 8i5 and the fourth electrode 6 are connected to each other by a second
connection conducting wire 12. The third electrode 5 and the fourth electrode 6 may be formed
to be continuous with each other. In the rotation detecting device according to the present
invention configured as described above, as shown in FIG. 12, when the rotating member 7 starts
to be rotated in a first direction shown by an arrow R in FIG. Both ends of the plate 1 are rotated
in a second direction opposite to the first direction, as shown by arrows X1 and X2 in FIG. 12,
respectively due to inertia according to the mass of the bimorph plate 1. It is curved as it is. At
this time, portions in the vicinity of the first electrode 3 and the fourth electrode 6 are displaced
so as to be compressed as shown by the arrow S in FIG. Further, portions in the vicinity of the
second electrode 4 and the third electrode 5 are arrows in FIG. It is displaced as it is stretched.
Therefore, a positive potential is generated at the first voltage output terminal 9 and a negative
potential is generated at the second voltage output terminal IO. Then, in the rotation detecting
device, when the rotating member 7 starts to be rotated in the second direction, a negative
potential is applied to the first voltage lead-out terminal 9 and to the second voltage lead-out
terminal 10. Each produces a positive potential.
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In this manner, also in this rotation detection device, the voltage corresponding to the rotational
angular acceleration around the axis of the holding portion 7a of the object to be detected for
rotation is obtained from the first and second voltage lead terminals 9 and 10. It can be taken
out. When this rotation detection device is shown by an equivalent circuit, as shown in FIG. 7C,
first and second capacitors C1 and Cz are connected in parallel to the first voltage lead terminal
9, and the respective capacitors C1 and Cz are connected. For Cz, third and fourth capacitors C, C
connected in parallel to each other are connected in series, and further, the second voltage
output terminal 10 is connected to each of the capacitors Cx, C- It is in a state of In the
equivalent circuit, the first to fourth capacitors c, c, c, c, c are the same as in the equivalent circuit
shown in FIG. 7A, the first to fourth ii & 3. The electric capacitance between 4.5.6 and the said
common terminal board 2 is shown. That is, in this rotation detection device, the electric capacity
is C, and an electromotive force of 2e can be obtained. Further, in the rotation detection device
according to the present invention, the bimorph plate l in each of the above-described
embodiments is provided with a connecting member for connecting one end side and the other
end side of the bimorph Fi + between the one end side and the other end side. Can be configured
to be able to detect rotational movement with higher sensitivity. That is, as shown in FIG. 13, the
rotation detecting device according to the present invention can be configured using the ringshaped connecting member 13 serving as the connecting member. The ring-like connecting
member 13 is formed in an annular shape having an inner diameter substantially equal to the
length of the bimorph plate 1 by a material such as a synthetic resin or metal. The ring-shaped
connecting member 13 is coaxial with the holding portion 7 a so as to surround the holding
portion 7 a of the rotating member 7, and both ends of the bimorph plate 1 are attached to the
inner wall portion. It is supported by the board 1. As described above, in the rotation detection
device configured using the ring-shaped connecting member 13, the ring-shaped connecting
member 13 bends the both end sides of the bimorph plate 1 when the rotation member 7 starts
to rotate. It rotates with respect to the rotating member 7. The rotation of the ring-shaped
connecting member 13 and the bending of the bimorph plate 1 occur due to inertia according to
the mass of the ring-shaped connecting member 13 and the bimorph plate l. Therefore, in this
rotation detection device, the curvature of the bimorph plate 1 is larger than that of the rotation
detection device configured without using the ring-shaped connecting member 13 with respect
to the predetermined rotational angular acceleration of the rotation member 7; It is possible to
detect the rotational movement of the detected object to be rotated with higher sensitivity.
Further, in this rotation detection device, since both ends of the bimorph plate 1 are connected to
each other by the ring-shaped connecting member 13, the bending displacements of both ends of
the bimorph plate 1 are corrected so as to be equal to each other. More accurate detection of the
rotational movement of the detected rotation object can be performed. Further, in the rotation
detecting device according to the present invention, as shown in FIG. 14, a frame-shaped
connecting member 14 formed in a rectangular frame shape can be used as the connecting
member. The frame-shaped connecting member 14 is formed at the inner side in such a size as to
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accommodate the bimorph plate l, and both ends of the bimorph plate 1 are attached to the inner
wall portion so as to surround the holding portion 7a of the rotating member 7. Thus, the
bimorph plate 1 is supported. Also in the rotation detection device configured using such a
frame-shaped connecting member 14, when the rotating member 7 starts to rotate, the frameshaped connecting member 13 bends the both end sides of the bimorph plate 1 and the abovementioned It rotates with respect to the rotating member 7. Therefore, in this rotation detecting
device, the rotational movement of the object to be detected to be rotated can be detected with
high sensitivity, and the bending displacements on both ends of the bimorph plate l are corrected
to be equal to each other. More accurate detection of the rotational movement of the rotational
object can be performed. Furthermore, in the rotation detecting device according to the present
invention, as shown in FIG. 15, an arm-like connecting member 15 formed in a curved rod shape
can be used as the connecting member. The arm-like connecting member 15 is formed so as to
extend to both ends of the bimorph plate 1 and is supported by the bimorph plate 1 by
correspondingly attaching both ends of the bimorph plate 1 to both ends. A rotation detection
bag configured using such an arm-like connecting member 15! Also in this case, when the
rotating member 7 starts to rotate, the arm-like connecting member 15 rotates with respect to
the rotating member 7 while curving both end sides of the bimorph plate l. Therefore, in this
rotation detection device, the rotational movement of the object to be detected to be rotated can
be detected with high sensitivity, and the bending displacements on both end sides of the
bimorph plate 1 are corrected to be equal to each other. More accurate detection of the
rotational movement of the rotational object can be performed. In the rotation detecting device
according to the present invention, both ends of the bimorph plate 1 can be used without using
the connecting member as described above in order to detect the rotational movement of the
object to be rotated with high sensitivity. Alternatively, a weight member may be attached to
increase the inertial mass.
By the way, in the rotation detecting device according to the present invention, as shown in FIG.
16 and FIG. 17, in order to prevent the damage due to the excessive bending displacement of the
bimorph plate l, First to fourth stopper members 16.17.18 19 may be provided to regulate. The
first and second stopper members 16 and 17 are attached to a first stopper support member 20
attached to the rotating member 7. The first stopper support member 20 is formed in a
substantially fan-shaped plate shape, and along the one end side of the bimorph plate 1, even if
the bimorph plate 1 is curved and displaced, the bimorph plate 1 is The base end side is attached
to the rotating member 7 in a non-contacting state. The first and second stopper members 16
and 17 are provided on the side of the tip end of the first stopper support member 20 so as to
face the bimorph plate 1. The first stopper member 16 is opposed to the one surface side of the
bimorph plate 1 at a predetermined interval. Further, the second stopper member I7 is opposed
to the other surface side of the bimorph plate 1 at a predetermined interval. The third and fourth
stopper members 1819 are attached to the second stopper support member 21 attached to the
rotating member 7. Like the first stopper support member 20, the second stopper support
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member 21 is formed in a substantially plate shape, and along the other end side of the bimorph
plate l, the bimorph plate The base end side is attached to the rotating member 7 so as not to
abut on the bimorph plate 1 even if l is bent and displaced. The third and fourth stopper
members 18.19 are provided on the side of the tip of the second stopper support member 21 so
as to face the bimorph plate l. The third stopper member 18 is opposed to the one surface side of
the bimorph plate 1 at a predetermined interval. Further, the fourth stopper member 19 is
opposed to the other surface side of the bimorph plate 1 at a predetermined interval. As
described above, in the rotation detection device configured using the respective stopper
members +6.1718.19, when the amount of bending of the bimorph plate l becomes equal to or
more than the predetermined amount, the bimorph plate l. It abuts on any of 17, 18 and 19 and
the further bending displacement is regulated. That is, the bimorph plate 1 is shown at one end
only between the first and second stopper members 16.17 shown by the arrow I in FIG. 17 and
at the other end shown by the arrow J in FIG. Curved displacement is possible only between the
third and fourth stopper members 18.19.
Therefore, in the rotation detection device configured using the stopper members 16.17 and
18.19, the rotational speeds of the rotary member 7 increase to such an extent that the bimorph
plate l is excessively curved and displaced. Also in this case, the amount of bending displacement
of the bimorph plate 1 is regulated, and the breakage of the bimorph plate 1 is prevented. In
addition, in the rotation detection device configured using the stopper member as described
above, the connection member as described above may be used. And each said stopper member
16.17. In order to prevent damage to the bimorph plate 1 even when the bimorph plate 1 abuts,
the l819 has appropriate flexibility and elasticity such as rubber and a foamable synthetic resin
in order to prevent damage to the bimorph plate 1. You may form with a material. The rotation
detecting device according to the present invention configured as described above is used by
being attached to a so-called hand-held unit 24 of a so-called headphone device, as shown in FIG.
18, for example. The above-described sinkphone device is configured by being connected by a
pair of electroacoustic transducers 22 for the left ear, electroacoustic transducers 23 for the
right ear, and a head hunt unit 24. This headphone device is supported by positioning the left ear
electro-acoustic 9 converter 22 near the left ear 1 pinna of the user by attaching the head hunt
unit 24 to the head 26 of the user. At the same time, the right ear electro-acoustic transducer 23
is positioned and supported near the right auricle of the user. The rotation detecting device is
attached to the above-described headphone device from the fact that the base end side portion
7b of the rotating member 7 is attached to the upper side of the substantially central portion of
the above-mentioned head hand portion 24. By thus attaching the rotation detection device
according to the present invention to the headphone device, it is possible to detect the rotational
movement of the head 26 on which the headphone device is mounted. The phase of the sound
reproduced by each of the ear electro-acoustic transducers 22.23 in response to the rotational
movement of the head 26 detected by the rotation detection device using a signal processing
device (not shown) By performing predetermined signal processing to change the sound
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background, good sound reproduction without so-called in-head localization can be performed. In
addition, when the rotation detection device according to the present invention is attached to a
portable video camera device, the video signal is processed in response to the so-called rotational
movement of the video camera device due to so-called hand movement to correct the swing of
the image. Can be applied to the As described above, in the rotation detecting device according to
the present invention, the bimorph plate is fixed at the center position in the longitudinal
direction to the rotating member that is rotationally moved with the object to be rotated.
Therefore, when the rotation member is rotated, one end and the other end are curved in the
same rotation direction with respect to the rotation member. In this rotation detection device,
one end side and the other end side of the bimorph plate disposed opposite to each other with
the rotating member interposed therebetween are parts of the same bimorph plate, so these one
end side and the other end The emf characteristics of the sides can easily be made equal. In
addition, since the bimorph plate is fixed at the central position to the rotating member, the risk
of breakage or falling off when there is an impact propagation from the outside can be reduced.
Then, the plurality of electrodes formed on the bimorph plate on both sides of the longitudinal
center position of the bimorph plate are added with each other by the electromotive force
generated by the curvature of the bimorph plate generated by the rotation of the rotating
member. Thus, an electromotive force corresponding to each rotational speed of the rotating
member can be obtained. Further, since the plurality of electrodes are formed on the same
bimorph plate, the connection between the electrodes is simplified and the connection for
increasing the electric capacity between the terminals for taking out the electromotive force is
facilitated. It can be carried out. In this rotation detection device, if connection is made to
increase the electric capacity between the terminals for taking out the electromotive force, the
low cutoff frequency for detection of rotational movement can be lowered, and a wide frequency
including the low frequency band The rotational movement of the band can be accurately
detected. And, in this rotation detecting device, when a connecting member for connecting one
end side and the other end side is provided so as to extend between the one end side and the
other end side of the bimorph plate, according to the mass of the connection member. The
amount of bending of the bimorph plate per rotational angular velocity of the rotating member is
increased. Therefore, in the rotation detection device provided with the connection member, the
detection sensitivity of the rotational movement can be further improved. That is, the present
invention is easy to manufacture and has good durability against shocks and the like, as well as
the rotational movement of the accurate and sensitive object to be detected over a wide
frequency band including the low frequency band. It is possible to use a rotation detection device
that can perform detection.
[0002]
Brief description of the drawings
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[0003]
The first is a perspective view showing the configuration of the rotation detection device
according to the present invention, FIG. 2 is a plan view showing the configuration of the rotation
detection device, and the third section is a first rotation of the rotation detection device. It is a
top view which shows the state which is detecting the direction, FIG. 4 is a top view which shows
the state which the said rotation detection apparatus has detected the 2nd rotation direction.
5 is a plan view showing the structure of a rotation detection device according to the present
invention having a poling direction different from that of the rotation detection device shown in
FIG. 1, and FIG. 6 is a rotation detection device shown in FIG. It is a top view which shows the
state which is detecting the 1st rotation direction. FIG. 7A is a circuit diagram showing an
equivalent circuit of the rotation detecting device shown in FIG. 2. FIG. 7B is a circuit l showing
an equivalent circuit of the rotation detecting device shown in FIG. FIG. 7C is a circuit diagram
showing an equivalent circuit of the rotation detecting device shown in FIG. 11, and FIG. 8 is a
circuit diagram showing an equivalent circuit of the rotation detecting device shown in FIG. FIG.
9 is a plan view showing the structure of a rotation detection device according to the present
invention having a polling direction different from that of the rotation detection device shown in
FIG. 5, and FIG. 10 is a rotation detection device shown in FIG. Is a plan view showing a state in
which a first rotation direction is detected. 11 is a plan view showing the configuration of a
rotation detection device according to the present invention having a polling direction different
from that of the rotation detection device shown in FIG. 9, and FIG. 12 is the rotation detection
device shown in FIG. Is a plan view showing a state in which a first rotation direction is detected.
FIG. 13 is a perspective view showing the configuration of a rotation detecting device according
to the present invention using a ring-shaped connecting member. The 14th is a perspective view
showing the composition of the rotation detecting device concerning the present invention using
a frame-like connecting member. FIG. 15 is a perspective view showing the structure of a rotation
detecting device according to the present invention using an arm-like connecting member. The
sixteenth time is a perspective view showing the configuration of the rotation detection device
according to the present invention using the stopper member, and FIG. 17 is a plan view showing
the configuration of the rotation detection device according to the present invention using the
stopper member. Eighteenth is a perspective view showing a state in which the rotation detecting
device according to the present invention is applied to a sound reproducing device.
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