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JP2005140949

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2005140949
PROBLEM TO BE SOLVED: To provide a speaker box for an electronic keyboard instrument,
which simultaneously emits a musical tone having good characteristics to both a performer and a
spectator. SOLUTION: A substantially columnar casing (30) having a plurality of side surfaces
along the arrangement direction of keys of the electronic keyboard instrument, and a first side
surface (30FL) of the plurality of side surfaces facing the front of the electronic keyboard
instrument A first speaker unit having at least one high frequency speaker (31FL) and one low
frequency speaker (32FL), and a second of the plurality of side surfaces facing the rear of the
electronic keyboard instrument. One high-tone speaker (31BR) provided on the side surface
(30B) of the first speaker unit so as to make the backs face each other with respect to the hightone speaker of the first speaker unit; There is provided a second speaker unit having at least one
bass speaker (32BR) provided so that the back faces are mutually opposed to the bass speaker.
[Selected figure] Figure 2
Speaker box for electronic keyboard instruments
[0001]
The present invention relates to a speaker box for an electronic keyboard instrument suitable for
use in an electronic piano, an electronic organ, and other electronic keyboard instruments.
[0002]
In recent years, in electronic keyboard instruments such as electronic pianos, an electronic
circuit / speaker unit is provided on the lower surface of the electronic keyboard instrument
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main body to facilitate assembly and maintenance inspection of the electronic components, and
electronic components such as amplifiers and speakers are provided here. Centrally
implemented.
That is, inside the electronic circuit / speaker unit, a plurality of pairs of left and right long
rectangular guides extending in parallel from the front to the back are disposed. Various
electronic circuits are mounted on a plurality of plates mounted on these guides, and these plates
are movable in the front-rear direction while sliding the left and right end portions thereof to the
guides (Patent Document 1).
[0003]
There is also known an electronic keyboard instrument in which only a speaker box is attached
to the lower surface of the main body. Among these electronic keyboard instruments, it is also
known that by turning the speaker box, the opening surface of the speaker is directed in the back
direction (for example, the direction of the audience in a concert) or in the front direction (Patent
documents 2, 3). JP, 2002-244661, A JP, 62-41198, A JP, 7-5193, A
[0004]
However, with the techniques described in Patent Documents 1 to 3 described above, it is
difficult to simultaneously emit tones with good characteristics to both the performer and the
audience. The present invention has been made in view of the above-described circumstances,
and an object thereof is to provide a speaker box for an electronic keyboard musical instrument
capable of simultaneously emitting tones with good characteristics to both the performer and the
audience.
[0005]
In order to solve the above problems, the present invention is characterized by comprising the
following configuration. In addition, the inside of a parenthesis is an illustration. In the speaker
box for an electronic keyboard instrument according to claim 1, a substantially columnar casing
(30) having a plurality of side surfaces along the arrangement direction of keys of the electronic
keyboard instrument, and the electronic keyboard among the plurality of side surfaces A first
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speaker unit provided on a first side (30FL) facing the front of the musical instrument and having
at least one high-pitched speaker (31FL) and one low-pitched speaker (32FL); One high-pitched
speaker provided on the second side (30B) facing the rear of the electronic keyboard instrument,
the backs of the high-pitched loudspeakers of the first speaker unit facing each other. (31BR) and
at least a bass speaker (32BR) provided so as to make the backs face each other with respect to
the bass speaker of the first speaker unit And having a speaker unit. According to the second
aspect of the present invention, there is provided the electronic keyboard instrument speaker box
according to the first aspect, wherein a first operation mode for generating a musical tone from
both of the first and second speaker units or The apparatus further comprises operation mode
selection means (106, 108) for selecting one of the second operation modes for generating a
tone from the first speaker unit while muting the second speaker unit. According to the third
aspect of the present invention, in the speaker box for electronic keyboard instruments according
to the second aspect, the first audio signal supplied to any one of the speakers in the first
speaker unit is filtered. A network circuit (102FL, 104FL) and a second network circuit (102BR,
104BR) for filtering an audio signal to be supplied to any of the speakers in the second speaker
unit, the operation mode selection The means supplies the audio signal to the first and second
network circuits in the first operation mode, and supplies the audio signal to the second network
circuit in the second operation mode. Supplying the audio signal to the first network circuit while
interrupting And butterflies. According to a fourth aspect of the present invention, in the speaker
box for an electronic keyboard instrument according to the first aspect, the opening surfaces of
the speakers of the first and second speaker units are inclined obliquely downward. The tilt angle
(θF) of the first speaker unit with respect to the vertical plane may be larger than the tilt angle
(θB) of the second speaker unit with respect to the vertical plane.
[0006]
As described above, according to the configuration in which the corresponding speakers of the
first and second speaker units are provided such that the back surfaces face each other, the
speakers can be arranged symmetrically as viewed from the front side and the back side. It is
possible to emit tones having characteristics substantially equal to both. Furthermore, according
to the configuration in which the first or second operation mode can be selected, it is possible to
emit the musical tone in an optimal manner according to the practice time and the production
time. Furthermore, according to the configuration in which the first and second network circuits
are provided independently for the first and second speaker units, the speaker unit that
generates sound regardless of the selected state of the first or second operation mode. Can be
made uniform. Furthermore, according to the configuration in which the inclination angle of the
first speaker unit with respect to the vertical plane is larger than the inclination angle with
respect to the vertical plane of the second speaker unit, the tone is emitted in an optimal state for
both the performer and the audience. It can sound.
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[0007]
1.
Structure of the Embodiment Next, the structure of the electronic keyboard instrument according
to the embodiment of the present invention will be described with reference to FIGS. In the
figure, reference numeral 10 denotes a frame of the electronic keyboard instrument, which is
formed in a rectangular shape when viewed from the front, and a pentagonal frame when viewed
from the side. A keyboard 20 is disposed on the entire top of the frame 10. The keyboard unit 20
includes an upper keyboard unit and a lower keyboard unit, and a plurality of keys are arranged
along the longitudinal direction of the upper keyboard unit and the lower keyboard unit.
Reference numeral 22 denotes a cover of the keyboard 20, which can be opened and closed.
Below the keyboard unit 20, a flat plate-like shelf board 14 on which the keyboard unit 20 is
disposed is provided, and on the lower surface thereof, an electronic circuit / speaker unit 30
formed in a square pole shape having a trapezoidal cross section .
[0008]
That is, on the lower surfaces of the end portions 141 and 142 of the shelf plate 14 and under
the side plate portions 121 and 122, elongated metal fittings H1 and H2 having L-shaped and
inverted L-shaped cross sections are fixed, respectively. At the upper ends of the circuit / speaker
unit 30, flanges F1 and F2 that protrude in the left-right direction are formed. Then, place the
flanges F1 and F2 on the horizontal parts of the metal fittings H1 and H2, align the electronic
circuit / speaker unit 30 at a predetermined position (the position of FIG. 1B), and fix the screws
N1 and N2 to the flanges F1 and F2. When it is screwed to the shelf board 14 while being
inserted, the electronic circuit / speaker unit 30 is fixed to the shelf board 14. When the screws
N1 and N2 are removed, the electronic circuit / speaker unit 30 can slide in the front-rear
direction while the flanges F1 and F2 slide on the metal fittings H1 and H2. Thus, the brackets
H1 and H2 form guide rails. A knee lever 40 is provided so as to project downward from the
lower surface of the keyboard 20 and the front of the electronic circuit / speaker 30, and is
operated by the player's knee. The numeral 50 is an expression pedal, and 54 is a pedal
keyboard, which are disposed below the frame 10. In FIG. 2, the expression pedal 50 is not
shown.
[0009]
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Next, the configuration of the electronic circuit / speaker unit 30 will be described with reference
to FIGS. 3 (a) to 3 (d). First, in FIG. 6A, the electronic circuit / speaker unit 30 has a trapezoidal
side surface shape, and the upper surface and the bottom surface of the electronic circuit /
speaker unit 30 are formed in a parallel flat plate shape. The front surface and the back surface
of the electronic circuit / speaker unit 30 are respectively inclined inward with respect to the
vertical surface, and the front surface inclination angle θF is set to “20 °” and the back
surface inclination angle θB is set to “10 °” There is. One of the features of this embodiment
is that the inclination angles are different between the front and the back as described above.
First, the back surface tilt angle θB is set to an angle such that the back surface speaker faces
the audience when the electronic keyboard instrument is placed on the stage of a general concert
hall. On the other hand, since the front speakers are disposed below the shelf board 14, it is
difficult to cause the front speakers to directly face the player's face. Therefore, in the present
embodiment, by making the front inclination angle θF larger than the back surface inclination
angle θB, the radiation sound from the front speaker is reflected to the floor so that the
reflection sound can easily reach the performer. .
[0010]
Next, in FIG. 3B, reference numeral 35 denotes an electronic circuit unit, which is provided at a
substantially central portion of the electronic circuit / speaker unit 30. The electronic circuit /
speaker unit 30 is divided into right and left by the electronic circuit unit 35, thereby forming
left and right enclosure units 36L and 36R on which various speakers are mounted. Reference
numerals 30FL and 30FR denote front plates that cover the fronts of the left and right enclosures
36L and 36R, and are fixed to the electronic circuit / speaker unit 30 so as to form substantially
the same surface as the front of the electronic circuit 35. The tweeter 31FL and the woofer 32FL,
33FL are mounted on the left front plate 30FL from the outer side (left side) to the inner side
(right side). Here, the woofer 32FL, 33FL is a speaker of the same shape and the same
specification. Further, since the tweeter 31FL and the woofer 32FL, 33FL are arranged in a
zigzag, the large-aperture woofer 32FL, 33FL can be mounted even if the width of the enclosure
portion 36L is narrow.
[0011]
Here, a set of speakers consisting of the tweeter 31FL and the woofer 32FL, 33FL is called a
"speaker unit". More generally, in the present specification, “at least one high-pitched speaker
and at least one low-pitched speaker opening in the same direction” are referred to as
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“speaker units”. Then, in order to form symmetry with respect to the left speaker unit, a
speaker unit including tweeter 31FR and woofer 32FR, 33FR is attached to the right front plate
30FR from the outer side (right side) to the inner side (left side). There is. 34, 34,... Are velcro
tapes, by which a saran net (not shown) is mounted so as to cover the entire front face of the
electronic circuit / speaker unit 30.
[0012]
Next, in FIG. 3 (c), 30B is a back plate, and woofer 32BL, 33BL, 32BR, 33BR and tweeters 31BL,
31BR for the back are attached thereto. Reference numerals 37 and 37 denote connection cords
for connecting the electronic circuit unit 35 to the keyboard unit 20. These rear speakers are
arranged symmetrically with respect to the front speaker shown in FIG. 3 (b). As a result, as
shown in FIG. 3 (d), the corresponding speaker units for the front and the back are arranged with
the backs facing each other. That is, inside the enclosure portion 36L, the front tweeter 31FL and
the back tweeter 31BR are disposed with the back facing each other, and the front woofer 32FL
and the back woofer 32BR, the front woofer 33FL, and the front woofer 32BR are disposed. The
back surface woofer 33BR is also disposed with the back surface facing in the same manner. The
speakers are arranged in the same positional relationship within the enclosure portion 36R.
Reference numerals 38L and 38R denote cylindrical bass reflex ports, which project from the
lower surface of the enclosures 36L and 36R toward the inside (upward) thereof. Velcro tapes
34, 34,... Are also attached to the back plate 30B, and the entire back plate 30B can be covered
with a saran net not shown.
[0013]
As described above, in the present embodiment, since the electronic circuit unit 35 is disposed at
the center of the electronic circuit / speaker unit 30 and the enclosure units 36L and 36R are
disposed on the left and right thereof, the electronic circuit / speaker unit 30 is integrated as a
whole. At the same time, the distance between the enclosures 36L and 36R can be sufficiently
secured. Further, since the tweeters 31FL and 31FR are disposed outside the woofer 32FL, 33FL,
32FR, and 33FR, sufficient sound image localization can be secured as compared with the case
where the tweeters 31FL and 31FR are disposed inside. Further, the front plates 30FL and 30FR
of these enclosures are disposed so as to form substantially the same surface as the front of the
electronic circuit unit 35, and all the speakers for the back are mounted on the back plate 30B on
one sheet. Therefore, interference between the speakers hardly occurs, and a good sound field
can be realized in the entire periphery of the electronic keyboard instrument.
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[0014]
Next, a network circuit used for band division of each speaker in the enclosure section 36L will
be described with reference to FIG. In the figure, the woofer 32FL, 33FL are connected in series,
and the input signal to the network circuit is applied as it is to the series circuit. Reference
numeral 102FL denotes a capacitor, and reference numeral 104FL denotes an inductor, both of
which constitute a high pass filter. Thereby, the high frequency component in the input signal is
applied to the tweeter 31FL. Further, similarly to the front speakers, the rear woofer 32BR and
33BR are connected in series, and an input signal to the network circuit is applied to the series
circuit via the switch 106. Reference numeral 102BR denotes a capacitor, and reference numeral
104BR denotes an inductor, both of which constitute a high-pass filter. Thereby, the high
frequency component in the input signal is applied to the tweeter 31 BR via the switch 108.
Here, when the capacitance of the capacitors 102FL and 102BR is “1 μF”, the inductance of
the inductors 104FL and 104BR is “0.52 mH”, and the impedance of the tweeters 31FL and
BR is “16Ω”, the frequency characteristics of the high-pass filter are shown in FIG. Shown in
(a).
[0015]
The switches 106 and 108 are interlocked on / off by an operating element provided on the
keyboard unit 20. Therefore, for example, at the time of practice, it is sufficient to emit the
playing sound only to the performer. Therefore, it is preferable to turn off the switches 106 and
108 and sound only the left and right speaker units on the front side. Further, at the time of a
concert, since it is necessary to emit the performance sound to both the performer and the
audience, it is preferable to turn on the switches 106 and 108 to make both the front and back
speaker units sound. A network circuit similar to that shown in FIG. 7 is also provided to the
front and rear speakers in the enclosure section 36R. A switch for turning on and off the rear
speaker unit in the enclosure 36R interlocks with the switches 106 and 108.
[0016]
By the way, although two systems of high pass filters are configured by the capacitors 102FL and
102BR and the inductors 104FL and 104BR in the present embodiment, it is also conceivable to
share the high pass filters for the front and rear tweeters 31FL and BR. An example of the circuit
configuration in that case is shown in FIG. 8 for reference. In FIG. 8, the high frequency
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component in the input signal is applied to the tweeter 31FL by the high pass filter including the
capacitor 102FL and the inductor 104FL as in the present embodiment (FIG. 7). On the other
hand, the tweeter 31BR and the switch 120 are connected in series, and this series circuit is
connected in parallel to the tweeter 31FL. The frequency characteristic when the switch 120 is
turned off in this circuit is similar to the characteristic shown in FIG. On the other hand, the
frequency characteristic when the switch 120 is turned on is as shown in FIG. 9 (b). In the
frequency characteristic of FIG. 9B, a peak appears near “7 to 9 kHz” as compared with the
characteristic of FIG. 9A. Accordingly, it can be understood that, depending on the on / off state
of the switch 120, a difference occurs in the sound quality emitted from the front side speaker.
On the other hand, in the present embodiment, a high pass filter is provided independently for
each speaker unit, so that the sound quality of the front speaker unit can be kept uniform
regardless of the on / off state of the switches 106 and 108. It is possible to
[0017]
2.
Measurement Result Next, the measurement result according to the present embodiment will be
described with reference to FIGS. First, in FIG. 4, the electronic keyboard instrument is placed in
the anechoic chamber, the measurement microphone is placed at a distance of 1 m from the
electronic keyboard instrument, and the electronic keyboard instrument is horizontally oriented
at “0 °”, “45 °”, The frequency characteristic is shown when a uniform level sine wave
signal is supplied to both the front and back speaker units while sweeping the frequency by
rotating by “90 °”, “135 °” or “180 °”. Here, “0 °” indicates the front side of the
electronic keyboard instrument, and “180 °” indicates the back side. According to FIG. 4, it
can be seen that substantially equal frequency characteristics are obtained at “0 °” and
“180 °”. Here, the slight differences in the characteristics at “0 °” and “180 °” are
mainly attributable to the difference between the front and back tilt angles θF and θB.
Moreover, at the rotation angles of "45 °", "90 °" and "135 °", although a slight notch appears
due to the interference of the speaker etc., a substantially flat characteristic is secured over the
entire circumference I understand that.
[0018]
Next, FIG. 5 is a diagram showing the frequency characteristic at an angle (rear) of “180 °”,
where L1 is a characteristic when a sine wave signal is supplied to both front and rear speaker
units, and L2 is a sine wave signal. The characteristics when supplied only to the front speaker
unit are shown. In the characteristic L2, the sound pressure level is significantly reduced
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particularly in the middle to high range compared to the characteristic L1. Moreover, FIG. 6 is a
measurement result when the sine wave signal is supplied only to the front speaker unit, and the
other conditions are equal to the measurement conditions of FIG. Also in this example, the sound
pressure level in the mid-range to the high-range decreases significantly as the rotation angle
increases. Thus, according to FIGS. 5 and 6, in order to emit musical tones with good tone quality
to both the performer and the audience, both front and back speaker units are required. I
understand.
[0019]
3.
Modifications The present invention is not limited to the embodiments described above, and
various modifications can be made, for example, as follows. (1)In each of the above-described
embodiments, one speaker unit is composed of one tweeter and two woofers, but the type and
number of speakers constituting each speaker unit is not limited to this. For example, in addition
to the tweeter and the woofer, a medium-sounding scooka may be added.
[0020]
(2)
In addition, the electronic circuit / speaker unit 30 for mounting the respective speaker units is
not limited to the shape of the embodiment, and various shapes may be used as long as it has a
substantially columnar shape. For example, in the above embodiment, the front face of the
electronic circuit unit 35 is flat, but it may be shaped so as to project forward in a substantially
"H" shape.
[0021]
It is a front and a side view of the electronic keyboard instrument of one example of the present
invention. It is a rear view of the electronic keyboard instrument of one Example. 5 is an external
view of an electronic circuit / speaker unit 30. FIG. It is a frequency characteristic view of an
electronic keyboard instrument. It is a frequency characteristic view of an electronic keyboard
instrument. It is a frequency characteristic view of an electronic keyboard instrument. FIG. 1 is a
circuit diagram of a network circuit in an embodiment. It is a circuit diagram of a network circuit
for reference. It is a frequency characteristic figure of the network circuit of FIG. 7, FIG.
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Explanation of sign
[0022]
10: frame, 14: shelf board, 20: keyboard section, 22: lid section, 30: electronic circuit / speaker
section, 30B: back board, 30FL: left front board, 30FL, 30FR: front board, 30FR: right front board
31FL, 31FR, 31BL, 31BR: tweeter, 32FL, 32FR, 32BL, 32BR: woofer, 33FL, 33FR, 33BL, 33BR:
woofer, 34: magic tape, 35: electronic circuit portion, 36L, 36R: enclosure portion, 40 Reference
numeral: knee lever, 50: expression pedal, 54: pedal keyboard, 102 FL, 102 BR: capacitor, 104
FL, 104 BR: inductor, 120: switch, 121, 122: side plate portion, 141, 142: both ends of shelf plate
14, 106 , 108: switch (operation mode selection means).
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