Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-12-06
1990-09-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022731, G01V 904
Patent
active
049580671
ABSTRACT:
An optical operating device is provided on an operation panel of an audio system or the like, including a recess formed on the operation panel; several light receiving portions are formed on a first inside surface of the recess and arranged in a longitudinl direction of the recess; several light emitting portions are formed on a second inside surface of the recess opposed to the first inside surface, with each light emitting portion corresponding to a light receiving portion. Several light paths thus pass from the light emitting portions across the recess to the light receiving portions, and the light paths are arranged in the longitudinal direction of the recess. A light source supplies the light to each light emitting portion, and a photo detector is connected to the light receiving portions for generating a predetermined signal according to the light emitted from the light emitting portions and received by the light receiving portions. With this arrangement, tone control or the like in the audio system is easily carried out by inserting a finger into the recess and moving the finger to a desired position.
REFERENCES:
patent: 3861792 (1975-01-01), Donati
patent: 4292467 (1981-09-01), Odlen et al.
patent: 4511904 (1985-04-01), Takahashi
patent: 4692609 (1987-09-01), Pettersson
patent: 4695827 (1987-09-01), Beining et al.
patent: 4739160 (1988-04-01), Kawabe et al.
Iwasa Toshirou
Kobayashi Hitoshi
Nakatomi Yoshiyuki
Alpine Electronics Inc.
Carroll David H.
Nelms David C.
Shoup Guy W.
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