close

Вход

Забыли?

вход по аккаунту

?

JPS494325

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS494325
■ Transducer of capacitor type stereo pickup cartridge ■ Japanese Patent Application No. 4551341 [Phase] Application A (No. 45 (1970) June 15 @ inventor Watanabe Shoji Kawasaki City
Ku-ku Ku-ku-ku 70 Yanagimachi Tokyo Shibaura Electric Co., Ltd. Yanagi-cho factory inside
Yanagi-machi factory Same place Yakushiji Nobuo 0 applicant Tokyo Shibaura Electric Co., Ltd.
Kawasaki City Kawasaki City Kuhori-ku Horikawacho 72 [phase] Attorney Attorney Takeshi
Suzue 4, outside
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an electrode
assembly, and FIG. 2 is a perspective view showing an embodiment of a transducer of a capacitor
type stereo pickup cartridge according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transducer of a
capacitive stereo pickup cartridge. Conventionally, an electrode assembly composed of a fixed
electrode and an electret is configured by forming a metal layer on the polarization plane of the
electret by vapor deposition or bonding and fixing a metal plate on the polarization plane with a
conductive adhesive. However, when such an electrode assembly is used for the transducer of the
capacitor type pickup cartridge, the fixed electrode (metal layer, metal plate) is adhered and fixed
to the support fixed to the inner wall of the cartridge case. By the way, electrets have their charge
decay over time, and need to be replaced with new ones when the predetermined value is
lowered. However, in the conventional electrode assembly, the fixed electrode is attached and
provided on the polarization plane of the electret [111111], and since this fixed electrode is
adhesively fixed to the missing body, it is possible to replace only the electret. It is difficult, and if
the electret charge decays, the entire capacitor type pick-up cartridge has to be replaced, which
is very uneconomical. Therefore, an electrode assembly as shown in FIG. 1 has recently been
considered. That is, in this case, the electret 12 is fixed on the metal plate 11 constituting the
04-05-2019
1
fixed electrode by the holding plate (dielectric) 13. Therefore, in this configuration, the electret
12 is fixed on the fixed electrode 11 by the holding plate 13, so that even if the fixed electrode
11 is adhered and fixed to the support, for example, the fixed electrode 11 and the holding plate
It is possible to take out and replace the electret 12 from among the thirteen, which eliminates
the need to replace the entire condenser type pick-up cartridge, which is economical. However,
also in this case, when the transducer of the capacitor type pickup cartridge is configured in
combination with the movable electrode, the movable electrode is disposed to face the holding
plate 13, but the movable electrode is electret 12, that is, the presence of the holding plate 13.
Since it can not be disposed close to the fixed electrode 11, the value of the capacitance formed
between each other becomes small. In this case, in order to increase the capacity, the fixed
electrode 11 and the movable electrode may be thickened, and the facing area between them
may be widened, but the enlargement of the movable electrode adversely affects the vibration
characteristics of the movable electrode. . An object of the present invention is to provide a
transducer of a capacitor type pick-up cartridge using the novel electrode assembly as described
above, in particular, a transducer of a capacitor type stereo pick-up cartridge.
One embodiment of the present invention will be described below with reference to FIG. 2. A pair
of electrodes [111111] EndPage: 1 structure 24 formed by fixing the electret 22 on the fixed
electrode 21 by the pressing plate 23 (dielectric) The presser plate 23 is disposed inward and
fixed in a U-shape in the cartridge case 25. In this case, a notch 26 is formed at one corner of the
holding plate 23, and the pair of electrode structures 24 is positioned on the side closer to the
upper end of the upper end in the upper end. Will be placed on In the cartridge case 25, a pair of
movable electrodes 27. 27 are provided in combination, for example, in a V-shape. In this case,
the movable electrode 27 is a V-shaped electret 22 in the notch 26 each month. And is attached
to the outer periphery of the rear end large diameter portion 29 of the cantilever 28. The tip end
of the cantilever 28 penetrates the lower surface of the cartridge case 25 and protrudes to the
outside, and the record needle 30 is attached to the tip. The cantilever 28 is swingably supported
on the lower surface of the cartridge case 25 via a damper 31. That is, in the pickup cartridge
configured as described above, capacitors for left and right channels are used as stereo pickup
cartridges between each month of the V-shaped movable electrode 27 and each fixed electrode
21 of the pair of electrode structures 24. Type transducer, and when the record needle 30 scans
and vibrates the sound groove of the recording disc, this vibration is transmitted to the movable
electrode 27 through the cantilever 28, so that the left and right channels The capacitance of
each capacitor changes. Thus, according to such a transducer, the notch portion 26 is formed in
the holding plate 23 in the electrode assembly 24, and the movable electrode 27 is arranged
such that each month faces the electret 22 in the notch portion 26. Therefore, the movable
electrode 27 can be disposed close to the electret 22. That is, since a capacitor having a
sufficiently large capacity can be formed by the small movable electrode 27, the movable
electrode 27 can be made smaller, and the mass is reduced, so that the vibration characteristic of
the movable electrode is improved. Further, in this case, the movable electrode 27 is provided so
04-05-2019
2
that each month faces the electret 22 in the notch 26. However, the proximity side of the pair of
electrode structures 24 arranged and fixed in a V shape In this case, since the notch portion 26 is
positioned on the top side, the movable electrode 24 can be configured in a small seven-letter
shape [111111], and the above-mentioned effects become more remarkable. Since the mounting
is obtained closer to the oscillation central axis of the cantilever 28, there is an advantage that
the crosstalk talk of the left and right signals is reduced.
Furthermore, by providing the notched portion 26 as described above and providing the movable
electrode 27 opposite to it, the movable electrode 27 can be directly connected to the cantilever
28 without the need for a mediator such as an armature, so distortion can be reduced. .
Furthermore, when the movable electrode 27 having the same shape and the same mass is used,
the effective operating fixed electrode area can be increased by the configuration as described
above. Although the pressing plate 23 is made of a dielectric in the above embodiment, the
pressing plate 23 may be made of a metal plate. In this case, since both polarized surfaces of the
electret 21 are short-circuited by the holding plate 23 and the fixed electrode 21 which are metal
plates in this case, in this portion, the decay of the charged charge becomes slow and the life
becomes long. . In this case, in the electrode assembly 24 as described above, since the electret
21 can be replaced, when the charge of the portion exposed by the notch 26 is attenuated, the
position of the electret 21 is shifted, and this time The electret 21 can be used any number of
times if it is used so as to expose the shorted portion. Further, in this case, the portion of the
fixed electrode 21 corresponding to the inside of the notch 26 functions as a substantially fixed
electrode and forms a capacitor between the movable electrode 27 and the portion. As described
in detail above, according to the present invention, it is possible to provide a transducer of a
capacitor type stereo pickup cartridge having various advantages as described above.
04-05-2019
3
Документ
Категория
Без категории
Просмотров
0
Размер файла
11 Кб
Теги
jps494325
1/--страниц
Пожаловаться на содержимое документа