Photosensor controller for musical instrument having a driving m

Details Photosensor controller for musical instrument having a driving m Photosensor controller for musical instrument having a driving m

1992-10-07

1994-03-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250221, 250229, 341 31, 84462, H01J 4014

Patent

active

052910113

ABSTRACT:
A photosensor controller is described comprising sensor units 17-0 to 17-7, 18-0 to 18-7, 19-0 to 19-7 and a circuit 16 driving light emitting diodes by a method of time division. Each sensor unit comprises pairs of an LED and a photodiode. After the driving circuit 16 turn on the proceeding LED, if turns off the next LED for a period corresponding to the delay time constant of a detected signal from a photodiode which corresponds to "OFF", making a completely to "0" in this off period of turning off, even in case of waveform rounding. Following this, the next LED is turned on.

REFERENCES:
patent: 4970928 (1990-11-01), Tamaki
patent: 5130532 (1992-07-01), Clemens

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