Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1985-08-06
1987-04-28
Adams, Russell E.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 1, 354402, G03B 300
Patent
active
046609555
ABSTRACT:
A focus detecting device for a camera is disclosed which employs a CCD for producing an image signal carrying focus information. A monitoring circuit has a charge storing circuit for storing the charge generated from a light receiving element, so that the monitoring circuit monitors the amount of light received from the target object to be photographed and produces a charge signal representing the monitored amount. A reference signal generator is provided for producing a reference signal. Since the reference signal generator is defined by the same circuitry as the charge storing circuit, undesirable fluctuation in the charge signal will also be seen in the reference signal. Since undesirable fluctuation in both signals can be counterbalanced with each other, the comparison between the charge signal and the reference signal can be done with high accuracy.
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Ishida Tokuji
Norita Toshio
Adams Russell E.
Minolta Camera Kabushiki Kaisha
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