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JPS4927282

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DESCRIPTION JPS4927282
■ Cartridge ■ Japanese Patent Application No. 44-71524 [Phase] Application No. 44 (1969)
September 9 @ Former Joshou Australia 0 Applicant N. Nichii Tokyo Parts Co., Ltd. Tokyo Part
for Districts 6 7 35 [6] Phase] Agent Attorney Minoru Ito
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a bottom perspective view showing an
example of a cartridge according to the present invention, FIG. 2 is a cross sectional view thereof,
FIG. 3 is a cross sectional view showing a part thereof and FIG. It is sectional drawing of the
stylus apparatus which can be applied to invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cartridge for
reproducing signals from a record using an electrostatic mechanical-electrical converter, and in
particular to facilitate the replacement of the mounted head of a stylus. The cartridge according
to the invention will now be described with reference to the drawings. The cartridge 1 according
to the present invention comprises a main body 3 incorporating, for example, two conversion
devices 2 for converting air vibration into an electrical signal, and a head portion 4 formed
detachably with respect to the main body 3. The main body 3 accommodates the above two
conversion devices 2 and an amplification portion 7 for amplifying the electric signal obtained
from the conversion devices 2 in a shield case 17 attached to one surface, for example, the lower
surface of the bracket 5 As shown in FIGS. 2 and 3, the diaphragm 2 has a recess 8b formed on
the back surface 8a of the front plate or substrate 8 as the main body 3 as shown in FIG. 2 and
FIG. (Main diaphragm) 10 with the frame 9 facing forward and further facing the main
diaphragm 10 and housing a back plate (back electrode) 11 via a spacer lla to form [111 111]
There is. In this case, a first air chamber 30 is formed between the main diaphragm 10 and the
substrate 8, and a second air chamber 50 is formed between the main diaphragm 10 and the
back electrode 11. . The distance between the back electrode 11 and the main diaphragm 10 is
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relatively narrow, for example, about 20 to 30 μ. If the distance between the main diaphragm
10 and the back electrode 11 is narrowed, the sensitivity is increased, but if it is narrowed too
much, the air viscosity resistance becomes too large and the sensitivity is lowered. In order to
prevent this, for example, a large number of pores (concave portions) 12 may be formed in the
back electrode 11 substantially at each balance, thereby reducing viscosity resistance and
improving sensitivity. Further, a protrusion 13 having a through hole 31 communicating with the
first air chamber 30 is formed on the front surface of the substrate 8, and an acoustic resistor
13a such as cotton can be filled therein. In this case, the projection 13 is tapered as shown in
FIG. A conductive film is attached to the back electrode 11 side of the main diaphragm 10 of the
conversion device 2, and the back electrode 11 is formed of a conductive material, and an output
terminal of an electric signal is derived therefrom. In addition, the main diaphragm 10 may be set
to be permanently charged as is generally known. The electric signal thus obtained at the output
terminal 14 is supplied to the amplifier 1. Of course, two Q amplifiers 7 are provided
corresponding to the two conversion devices 2 respectively. The main diaphragm IO can be
formed of a polymer film, and the back electrode 11 can be formed of an acrylic resin.
In this case, a conductive film may be deposited on the main diaphragm IO side. The output
signal from such amplifier 7 is led out at the terminal plate 16. In the present invention, the head
portion 4 to which the stylus device 20 described later is attached is mounted on the bracket 5
so as to be fitted to the projection 13 of the conversion device 2 described above. The unit 4 is
configured to be detachable from the main body 3. For this reason, the head unit 4 is constituted
by integrating a stylus device 20, a vibrating body made of an elastic material, that is, a base 021, and a support 22 for holding these in a predetermined relationship [111111] EndPage: 1 .
The stylus device 20 is configured as shown in FIG. That is, an arm mounting portion 42 to which
the stylus arm 41 to which the stylus 40 is fitted is attached, a fixed mounting portion 43
provided on the opposite side of the mounting portion 42 to the arm 41, the arm mounting
portion 42 and the fixing portion The mounting is constituted by a connecting portion 44
mechanically connecting the portions 43 with each other. The stylus arm 41 is made of, for
example, a hollow piano wire, and one end of the arm 41 is formed of a hollow, for example,
flexible, flexible resin that is resistant to external influences such as temperature, etc. Get stuck.
Bonding the parts together by fitting k may be performed by roughening the inner surface of the
cylindrical portion 420 and bonding and bonding using an epoxy adhesive, or may be simply
press-fitted. Further, the connecting portion 44 is formed along the axis o, o 'so as to be closer to
the axis 0-0' as it approaches the center portion of the connecting portion 44, that is, in the
shape of a mountain ridge. The cross-sectional area of the part is formed so as to be extremely
small compared to that of the part 42. Further, as shown in FIG. 4, the arm attachment portion
42 is formed of the same flexible resin as the excitation arms 44a and 44b described above, but
the angles of the respective excitation arms 44a and 44b are the axes 0 to O '. They are formed
maintaining equal angular intervals of 45 ° with respect to the vertical direction. In this case, it
will be apparent that two excitation arms 44a and 44b are provided, one for stereo, but one for
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the excitation sides 44a and 44b, which can be applied for monaural use. The arm attachment
portion 41, the fixing portion 42, the connecting portion 43, and the excitation arms 44a and
44b can be integrally formed with each other. In addition, the fixed portion attachment is
provided with a tapered portion 47 on the side opposite to the connecting portion 44 in the
portion 43 so that a flexible, for example, rubber ring 4B can be inserted into the outer periphery
of the connecting portion 44. As clearly shown in FIG. 2, the support 22 has a projection 45
inward at the contact portion with the substrate 8 and has a through hole 46 in the through hole
45 in the projection 45. The bellows 21 and the fixing portion 43 of the stylus device 20 are
sandwiched and accommodated inside the lever, and the arm 41 of the stylus device 20 is
protruded outward of the head portion 4.
Further, as shown in FIG. 2, the bellows 21 has a cylindrical shape, one end of which is closed,
and the inner surface of the open end (open end) of the other end corresponds to the projection
13 of the conversion device 2 built in the main body 3 Is formed in a tapered shape. The bellows
21 is formed of a flexible material such as rubber. The stylus mounts the device 20 so that the
exciter arms 44a and 44b mentioned above abut the closed end of the bellows 21. When the
head portion 4 is fitted to the main body 3 so as to hold the opening 21ak projecting portion 13
of the bellows 21 in a predetermined relationship, the inner surface of the opening of the bellows
21 is completely and surely projected. Tightly, so that the projection 13 and the bellows 21
create a hollow part. Accordingly, the mechanical vibration obtained by the stylus device 20 is
transmitted to the bellows 21 and this transmission signal is transmitted to the conversion device
2 as air vibration of the hollow portion. In addition, in order to prevent dust and the like from
entering between the support 22 and the stylus device 20, the cover 26 may be provided. A
through hole 27A is drilled in the plate 27 in the main body 3 engaged with the head 4 described
above, and a through hole 28A is drilled in the support 22 so as to communicate with the
through hole 27A, The head 4 is attached to the main body 8 by means of screws 29 passing
therethrough. Accordingly, the head portion 4 can be detachably mounted via the screw 29. In
the illustrated example, the plate portion 27 is attached to the front surface of the substrate 8 of
the main body 3, the upper surface of the projecting portion 45 of the head portion 4 is turned to
the lower surface 49 thereof, and the head portion 4 is attached to the main body 3 Thus, the
opening portion of the bellows 21 of the head portion 4 is configured to be able to be exactly
fitted to the projecting portion 13 of the main body 3. As described above, according to the
present invention, the head unit 4 in which the stylus device 20 and the bellows 21 are
accommodated and fixed in the support 22 is provided so as to be detachable. When it is desired
to replace the stylus due to damage of the device 20 or the like, it is not necessary to replace the
entire cartridge, and the removable head 4 mounted in the main body 3 may be replaced with
leather. Furthermore, according to the configuration described above, since the excitation arm 44
at 44b of the head unit 4 and the bellows 21 are always in contact with each other at the head
unit 4 and are also integrally disposed, when replacing the head unit 4 In the above, EndPage: 2
has a great feature in which there is no fear that the contact state will be changed, and a reliable
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replacement operation can be performed with a simple operation. And since the bellows 21 is
fixed to the head portion 4, the opening of the bellows 21 can always be fitted with the
projecting portion 13 of the conversion device 2, and even after the conversion of the head
portion 4, the same transfer characteristics as before You can get
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