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JPS5544487

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DESCRIPTION JPS5544487
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing a conventional
cartridge device, FIG. 3 is a schematic view schematically showing it, and FIG. 3 is an
embodiment of the cartridge device according to the present invention. FIG. 5A and FIG. 5B are
side sectional views showing a modification of the present invention. 11 · · · · · · · · Cartridge
housing, 12 · · · · · · · · · · · · · · · · · · · · · · record needle, 14 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
damper 16 · · · · · · · Holta-11 T · · · · · · · · · · · · · · · · Dust cover. ・
DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement C of the
cartridge device. As is well known, C2, a car used for a record player) An IJ device has
conventionally been configured as shown in FIG. That is, the opening formed in the substantially
box-like cartridge housing J (only one part is shown)! A cantilever 3 provided with a record
needle 1 at one end is loosely inserted in 1llllJ1. The other end of the cantilever 3 passes through
the movable pole 4, the turnper 5 and the holder 6 in the cartridge case lid and is screwed into
the holder 6 by a screw 7 and swingable (two supported) by the damper 5. There is. In addition,
fixed poles am and llb are provided on the circular surface of the housing 11 so as to face the
shoulder A pole 4, and the movable bridge 4 and the fixed pole #a are provided. 8b constitute a
so-called movable capacity capacitor C1. The capacitance change of the capacitor C1 is supplied
to the oscillation circuit C (not shown). Further, the opening of the cartridge housing l is closed
by a dust cover 9. Here, the vibration when the skew distribution record needle 2 tresses a
recording board (not shown) is transmitted to the movable bridge 4 via the cantilever 3 and is
extracted as a change in capacity of the capacitor C1. Then, the capacitance change of the
capacitor CI is supplied to the pre-discard loss circuit and is FM-modulated, and an audio signal
can be obtained by detecting this FM modulation signal. It is a thing. However, in such a
conventional cartridge device, as shown in FIG. 2C: schematic C: as shown, the canna lever 1 has
two points (= fulcrum points) by the damper 5 and the dust cover 9, so that the force knee ′
There is a problem that unnecessary resonance occurs in the lever 3 and distortion occurs in the
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audio signal. Further, particularly when the material of the damper 5 and the dust cover 9 is
different, the compliance of the cartridge itself is changed, so that mutual management of the
material of the damper 5 and the dust cover 9 and the compliance is extremely difficult. This
invention is made by layering the above-mentioned circumstances, and it is possible to reduce
unnecessary resonance of the cantilever and to provide an IJ tweezer which is easy to manage
compliance (: scratch and good car). To aim. Hereinafter, one embodiment of the present
invention will be described in detail with reference to the drawings. In FIG. 3, reference numeral
11 denotes a substantially box-like cartridge housing (only one part is shown), and a cantilever
12 is loosely inserted in an opening @ I11 formed in the cartridge housing II.
The cartridge housing JZ outside s1 of the cantilever 12: a projecting end tin is provided with a
readh needle ZJ. The other end of the cantilever 12 located inside the cartridge housing 11 of the
cantilever 12 is inserted into the movable bridge 14, for example, the rubber damper ti and the
holder 11 and fixed to the holder 16 by the screw 17 ( = Supported by a damper 1g so as to
freely swing. The damper J1 (l, for example, a rubber dust cover 18 provided from the vicinity of
the supporting portion of the cantilever 12 in a diverging shape in the direction of the opening
m111 of the cartridge housing 11 from the vicinity of the support portion It is formed integrally
with IJ. A fixed pole 191 ° 192 is provided in the cartridge housing 11 so as to face the movable
bridge 14 and the movable bridge 14 and the fixed poles J9 J and J2 are so-called variable
capacitance capacitors C1. It is what constitutes. Then, the capacitance change of the capacitor 0
is supplied to an oscillation circuit (not shown). Here, the recording needle 13 is not shown, and
the vibration when the t-dot board is squeezed is transmitted to the movable electrode 14
through the cantilever 12 and is extracted as a capacitance change of the capacitor C1. Then, the
capacitance change of the capacitor C8 is supplied to the power generation circuit and subjected
to FM modulation, and an audio signal can be obtained by detecting the FM modulation wj4M
(here, the reproduction of the record board is performed. Therefore, according to the cartridge
apparatus 1 of me as described above, unnecessary resonance occurs because the fulcrum
position of the damper 75 and the dust cover 18 with respect to the cantilever 12 approaches as
schematically shown in FIG. This makes it difficult to reduce distortion of the previous M6 audio
signal. Further, since the damper 15 and the dust cover 18 are integrally formed, it is not
necessary to consider the variation in compliance due to the difference in material, and the
management of compliance is also facilitated. The dust cover 18 is brought into close contact
with the opening edge portion JJJ 7 of the cartridge housing 11 or the inside 1 el 13 including
the opening portion Ill of the cartridge housing 11 as shown in FIG. May be closed. The present
invention is not limited to the above-described embodiment, and various modifications can be
made without departing from the scope of the invention. Therefore, as described in detail above,
according to the present invention, it is possible to provide a tomo that can reduce unnecessary
resonance of the cantilever, and to provide a very good cartridge device in which compliance
management is easy.
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