OPTICAL SENSOR CONTROLLER

PURPOSE:To enable key-scanning having accuracy and high speed and causing no cross tale without using a high efficiency LED and a high speed response type photodiode. CONSTITUTION:An optical sensor controller is provided with sensor units 20-0-20-7, 21-0-21-7, and 22-0-22-7 which are composed of LED...

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Bibliographische Detailangaben
1. Verfasser:	MANTANI ROKUROTA
Format:	Patent
Sprache:	eng
Schlagworte:	ACOUSTICS AUTOMATIC MUSICAL INSTRUMENTS DETECTING MASSES OR OBJECTS ELECTROPHONIC MUSICAL INSTRUMENTS GEOPHYSICS GRAVITATIONAL MEASUREMENTS MEASURING MUSICAL INSTRUMENTS PHYSICS PIANOS, HARPSICHORDS, SPINETS OR SIMILAR STRINGED MUSICALINSTRUMENTS WITH ONE OR MORE KEYBOARD TESTING
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Beschreibung
Zusammenfassung:	PURPOSE:To enable key-scanning having accuracy and high speed and causing no cross tale without using a high efficiency LED and a high speed response type photodiode. CONSTITUTION:An optical sensor controller is provided with sensor units 20-0-20-7, 21-0-21-7, and 22-0-22-7 which are composed of LEDs and photodiodes, and the driving circuit 16 which drives LEDs with time division system, wherein, after emitting LEDs of the prestage, the driving circuit 16 puts out LEDs during a time corresponding to delayed time constant of a detecting signal of the photodiode for putting out, after that, LEDs of the succeeding stage are emitted.