Auto focusing apparatus selectively operable in an ordinary...

Details Auto focusing apparatus selectively operable in an ordinary... Auto focusing apparatus selectively operable in an ordinary...

2005-12-06

2005-12-06

Ho, Tuan (Department: 2612)

Television

Camera, system and detail

Optics

C348S345000

Reexamination Certificate

active

06972799

ABSTRACT:
A subject image is formed on a CCD through an imaging optical system including a focusing lens. The output from the CCD is input, through an A/D converter and the like, to an AE processor circuit for performing an auto-exposure control processing and an AF processor circuit for obtaining an evaluation value for auto-focusing through a gate circuit. When a release operation is performed, a CPU drives the focusing lens and operates the AF processor circuit and the like at a high speed frame rate if the CPU determines, on the basis of brightness evaluation values from the AE processor circuit, that the brightness of the subject is equal to or higher than predetermined brightness, and drives the focusing lens and operates the AF processor circuit and the like with high precision at an ordinary frame rate if the CPU determines that the brightness of the subject is lower than the predetermined brightness, thereby performing auto-focusing.

REFERENCES:
patent: 5196939 (1993-03-01), Elabd
patent: 5563658 (1996-10-01), Parulski
patent: 5629735 (1997-05-01), Kaneda
patent: 5668597 (1997-09-01), Parulski
patent: 5694168 (1997-12-01), Toji
patent: 6088060 (2000-07-01), Suda
patent: 6091452 (2000-07-01), Nishiyama

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