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JPS546881

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DESCRIPTION JPS546881
■ Photoelectric Type Pickup ■ Japanese Patent Application No. 46-5457 [Phase] Application
No. 46 (1971) Published 9th February 47-18505 @ Akira 47 (1972) Sept. 14 0 Kobayashi
Tatsuo Osaka City Abeno Ward Nagaikecho 22 22 Sharp Co., Ltd. @ Applicant Sharp Co., Ltd. 22
22 Naikecho Abeno-ku, Osaka-shi Akebono-cho Atsushi Attorney Attorney General Attorney
Attorney Fukushi A detailed explanation of the invention Invention according to the sound
groove of the record, the light source and photoelectric conversion The invention relates to an
optoelectronic pickup that suppresses noise from the pickup when the power is turned off in a
pickup having a configuration in which a shielding plate inserted between elements is vibrated to
change an amount of light irradiated to the photoelectric conversion element to convert it into an
electric signal. It is a thing. Generally, the photoelectric pickup has a circuit configuration as
shown in FIG. That is, the quantity of light of the lamp 1 is controlled by the mechanism of
[111111] according to the left and right signals of the stereo record to irradiate the photoelectric
conversion elements 2 and 2 'such as solar cells and phototransistors. , 2 'to obtain an output and
obtain a stereo signal In such a conventional photoelectric type pickup, a shock noise appears at
the output of the photoelectric type pickup when the lamp 1 is turned off. The present invention
aims to prevent the above-mentioned shock noise, and will be described below with reference to
the drawings. FIG. 2 shows an embodiment of the photoelectric pickup according to the present
invention, in which the photoelectric conversion elements 2 and 2 'are provided facing the lamp
1, and the photoconductors 3 and 3' are interposed from each photoelectric conversion element.
It takes out the stereo left and right signals. The photoconductors 3 and 3 ′ are provided at
positions irradiated by the lamp 1. Here, the term "photoconductor" refers to an element whose
impedance is low when light is irradiated to it and which becomes high when light is not
irradiated. That is, in the present embodiment, while the lamp 1 is on, the impedance of the
photoconductors 3 and 3 'is low, so that the equivalent circuit is as shown in FIG. When the lamp
1 is extinguished, the impedance of the photoconductors 3 and 3 becomes high, so that noise
noise generated when the lamp 1 is extinguished is not transmitted to the subsequent stage.
Here, the reason is described in more detail. In the case of a photoconductor, for example, CdS,
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the resistance value becomes steep if it is not suddenly irradiated at all even if light is irradiated
so that the resistance value becomes low to the extent shown in FIG. The time of shock noise
generation does not occur completely at the same time as the extinguishment of the lamp 1
completely, but it follows the change of its resistance value completely, that is, this is like CdS
This is because the change in the resistance value of the photoconductor 3, 3 'is rapid.
That is, a photoconductor such as CdS is made of a semiconductor, and the change in resistance
is considered to be the output current per energy of incident light, and the response speed is
about 10 m8 [111111] EndPage: 1
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