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

1988-09-30

1989-08-29

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821331, H04N 319

Patent

active

048622737

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 producng 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.

REFERENCES:
patent: 3934161 (1976-01-01), Caywood
patent: 4032934 (1977-06-01), Hendrickson et al.
patent: 4293207 (1981-10-01), Aoki et al.
patent: 4320946 (1982-03-01), Aoki et al.
patent: 4410258 (1983-10-01), Aoki et al.
patent: 4410261 (1983-10-01), Masunaga et al.
patent: 4412741 (1983-11-01), Stein
patent: 4460836 (1984-07-01), Tsunekawa et al.
patent: 4529886 (1985-07-01), Yokoyama et al.
patent: 4541016 (1985-09-01), Ochi et al.
patent: 4597014 (1986-06-01), Suzuki
Fairchild Semiconductor 1975 catalogue, "MOS/CCD Databook", 1975, pp. 5-12, 14, 16, and 17.
IEEE Transactions on Electronic Devices, Dec. 1966, vol. ED-13, No. 12, "Monolithic Mosaic of Photon Sensors for Solid State Imaging Applications", by Schuster et al.
IEEE Transactions on Electronic Devices, No. 1971, vol. ED-18, Nov. 11, Charge-Coupled Imaging Devices: Experimental Results, Tompsett et al.
Self-Scanned Image Sensors Based on Charge Transfer by the Bucket-Brigade Method, Weimer et al.

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