| 摘要 |
<p>PURPOSE:To improve manipulation while simplifying structure by providing a light emitting unit, photoelectric converter, sorting circuit which supplied selectively only electric signals of more than a constant level, switching control circuit which supplies a signal for the discrimination of a photo detecting element irradiated with light, and information generating unit. CONSTITUTION:The light emitting unit consists of light emitting element 1 and lighting circuit 2; light is converted by photo detecting element 3 into an electric signal, which is amplified by amplifier 4, and the obtained electric signal is sent out after being switched in sequence by change-over circuit 5. Further, it is amplified by amplifier 6 and comparator 7 compares the level of the electric signal with a reference level (alpha), thereby sending only signal (e) of more than the level. Oscillator 8 and counter 9 constitute the control circuit which switches change-over circuit 5 in sequence. Register 10, when supplied with signal (e) from comparator 7, holds discrimination signal (g) to generate information signal (f), which is supplied to a gate circuit to use signal (e) as a gate signal, and it is outputted from the gate circuit and inputted to computer 11 of an information processor.</p> |
