G - Physics
03
B
G03B 21/53 (2006.01)
Patent
CA 2125407
2125407 9409405 PCTABS00032 An autofocus device for still projectors, e.g. slide projectors, is disclosed, said device operating according to the triangulation method in which there are provided a generator circuit (61) to control a measuring radiation source (1) designed as an infrared light emitting diode by means of variable current pulses (LI) and a signal processing circuit (62) for digital signals. The generator circuit (61) is provided with a controllable ramp generator (610) to produce sawtooth current pulses (LI), and a control circuit (611) to control their leading edge slopes in response to the signals (E1, E2) obtained from a dual photoreceiver (4). In the signal processing circuit (62) there are provided a threshold circuit (620) to produce digital input signals (ED1, ED2) from the signals (E1, E2) obtained, and a signal decoding circuit (621) to separate a digital direction signal (DIR) and a digital speed signal (SP) from the input signal (ED1, ED2), whereby the signal decoding circuit (621) is followed by signal converting circuit (624, 624') to produce a motor control voltage (MDC, MST) for a servomotor (5).
Eastman Kodak Company
Gowling Lafleur Henderson Llp
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