| 摘要 |
An infinite-distance detecting circuit for use in an auto-focusing system in a camera including an amplifier section for amplifying a position detection signal, a reference signal generation section sampling the position detection signal, holding the sample as a reference signal level, and amplifying the reference signal level in accordance with a variable gain in order to generate the infinite-distance-determining reference signal, and a comparator comparing the infinite-distance-determining reference signal to the amplified position detection signal in order to detect an infinite focus distance.
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