Focus condition detecting device for use in a camera

Details Focus condition detecting device for use in a camera Focus condition detecting device for use in a camera

1986-09-09

1988-11-08

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821331, H04N 314

Patent

active

047837012

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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