Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1977-01-27
1978-09-12
Mullins, James B.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
235458, 250227, G06K 710
Patent
active
041140451
ABSTRACT:
In a scanning receiver set with a PLL frequency synthesizer, an optical card reader for presetting and memorizing a desired receiving channel is provided. Associated with n light sources which are provided for n channels and successively turned on or off under the control of a scanning control circuit are n reflectors each having one incident surface and m reflection surfaces. A beam of light from respective light sources incident to the incident surface is divided into m reflected light fluxes, substantially parallel with each other, by the m reflection surfaces. One of m light receiving elements receives the m-th reflected light flux of the respective reflectors. Connected to each one of m light receiving elements operable by the reflected light fluxes is a switching circuit which in turn is connected with a programmable counter. Inserted between the reflectors and the light receiving elements is a card having, in a matrix of n columns and m rows, holes which are possibly punched out for transmission or interruption of the reflected light fluxes from the reflectors to the light receiving elements. Operations of the light receiving elements and the switching circuits are controlled by the presence or absence of the holes so that m binary codes are applied to the programmable counter to determine the frequency division ratio of the same.
REFERENCES:
patent: 3065356 (1962-11-01), Blake et al.
patent: 3937972 (1976-02-01), Snell
Hitachi , Ltd.
Mullins James B.
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