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JPS5625898

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DESCRIPTION JPS5625898
Description 1, title of the invention
コンデンサカートリッジ
The present invention relates to a capacitor cartridge, and more particularly to an improvement
of its complementary type stereo pickup unit. As well known, a capacitor cartridge provided for
use as a disc record h has a movable body interlocked with a cantilever as its pickup portion and
a fixed pole opposed to the movable rod, and a record needle has a sound groove. The vibration
generated by tracing is converted into a change in capacitance between both electrodes to obtain
a reproduction output. FIG. 1 shows a basic configuration conventionally known as such a
capacitor cartridge t, and from the side of the fixed pole 13 opposite to the movable body 12
interlocked with the cantilever 11, the 'good air signal of F9N5'. In the conversion circuit 14 for
converting into a signal, an output which has a small value and a change in valley amount is
introduced. Here, the 1d recent electret tends to be used as the fixed electrode 13, and it is
general to use a source follower circuit by field effect transistors as shown in the figure as the
conversion circuit 14 of the lift. However, in the case of considering the complementary type
stereo pickup in such a fundamental configuration, as shown in FIG. 2, naturally, as shown in FIG.
2, four fixed & 131N 132. 133, 134 are required for R channel output. EndPage: 1 had the
following disadvantages. In other words, requiring four fixed poles to obtain the output of both L
and R channels is disadvantageous in terms of manufacturing, cost and reliability, etc., and it is
more likely that there is a gap between each fixed pole above all. The point is that you must take
into account that And, such a defect is highlighted as a very serious defect when using an electret
as a fixed pole. Therefore, the present invention has been made in view of the above-described
point, and is an extremely good capacitor cartridge including a complementary type stereo pickup portion which is improved so as to simplify and reliably remove the above-mentioned
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conventional defects. The purpose is to provide. First, the basic configuration of the capacitor
cartridge according to the present invention will be briefly described. As shown in FIG. 3, the
output is introduced directly into the conversion circuit 24 from the movable body · 22
interlocked with the canner and -lever 2 The fixed pole 23 opposite to the body 22 is connected
to the reference potential point so as to be grounded. That is, according to such a principle
configuration, when considering a complementary type stereo pickup V, the fixed poles provided
on both sides of the movable body are respectively.
It is possible to make common to both R channels. That is, the capacitor cartridge according to
the present invention supports a pair of blade-like movable bodies having a predetermined
opening angle through the insulator at the base end of the cantilever and having a plane
perpendicular to the axial direction of the force / tever lever. A pair of flat plate-like fixed poles
are provided so that flat portions face each other in common on both sides of the pair of vanelike movable bodies, and the outputs of both R channels are obtained from the pair of vane-like
movable bodies. It is equipped with a complementary type stereo pickup configured to be
separately derived, and is characterized in that fixed poles opposed to both sides of the movable
body are common to both nL and R channels. is there. Next, an embodiment of the present
invention will be described in detail with reference to FIG. 4 based on the above outline. That is,
the thin tapered tubular cantilever 31 made of a light metal portion or the like has the record
needle 32 attached to the small diameter tip thereof, and the large diameter proximal end thereof
has a predetermined opening angle through the insulator 33. The pair of blade-like movable
bodies 341.342 are supported with the direction orthogonal to the axial direction of the
cantilever as a plane. Here, the base end portion of the cantilever 31 is vibratably supported by a
predetermined portion of the cartridge housing (not shown) via the tension member 35 and the
holder 36. Then, a pair of flat plate-like fixed electrodes 371.372 having an electret or the like,
having flat portions of a size opposite to the pair of blade-like movable bodies 31.degree. 342 in
common on both sides thereof, are provided in pair. Ru. Further, a lead wire 3111.382 which is
not shown in the drawing but is connected to a conversion circuit of both R channels is derived
from the pair of blade-like movable bodies 341, 34; The pair of flat plate-like fixed electrodes J7J
and 372 are connected to a reference potential point via a grounding means (not shown). Thus,
in the above configuration, the vibration of the record needle 32 transmitted to the cantilever 31
is distributed to each of the pair of blade-like movable bodies 341.342 on both sides thereof, and
is distributed to each R channel. Between the pair of flat plate-like fixed electrodes 321.degree.
372 common to both R channels, a change in capacitance according to the amount of vibration of
the corresponding Tiginnel is obtained complementarily. The complementary capacitance change
output for each channel is supplied to a conversion circuit (not shown) through leads 38J, 382
derived from a pair of blade-like movable bodies 341. The reproduction output converted to the
signal is superior.
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That is, according to the capacitor cartridge as described above, the single type stereo pickup
unit is formed on both sides of the movable body, and is configured as a pair of flat plate-like
fixed poles shared by both R channels. Since two flat plate fixed poles EndPage: 2 are required
without requiring four fixed poles, it is advantageous in terms of manufacturing, cost and
reliability, and the variation in both R channels is taken into consideration. It has the advantage
of not having to be. And such an advantage is particularly effective when using an electret as a
fixed pole. Of course, the present invention is not limited to only the illustrated and illustrated 冥
-examples, and various modifications can be made without departing from the scope of the
present invention. Accordingly, as described in detail above, according to the present invention,
by making the fixed poles of both L and R channels common, an improved complementary can be
obtained so that conventional defects can be easily and surely removed. It is possible to provide a
very comfortable condenser cartridge comprising a stereo pickup unit.
4. Brief description of the drawings. FIG. 1 and FIG. 2 are perspective views showing the basic
construction of a conventional capacitor cartridge and the complementary type stereo pick-up
portion thereby, and FIGS. 3 and 4 are capacitor cartridge according to the present invention. 31
is a perspective view showing the principle of the basic configuration of the present invention
and a complementary example of the complementary type stereo pickup unit according to the
present invention 31... Cantilever 32 .. record needle 33 insulator 34 J 142. Working pole, 35:
tension member, 36 holder, 371.372, fixed pole, 381, 382 lead wire. Applicants Attorney
Attorney Takehiko Suzue EndPage: 3
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