In-focus sensing device for sensing an in-focus condition using

Details In-focus sensing device for sensing an in-focus condition using In-focus sensing device for sensing an in-focus condition using

1994-11-14

1995-12-12

Greening, Wendy R.

Television

Camera, system and detail

Optics

348355, 354402, H04N 5232

Patent

active

054754291

ABSTRACT:
In an in-focus sensing device for a camera, an optical system directs the luminous flux from the subject. An optoelectric transducer section converts the optical distribution of the luminous fluxes with different optical path lengths passing through the optical system, into an electrical distribution. A frequency extracting section extracts specific frequency components from each output of the optoelectric transducer section. A frequency component ratio sensing section obtains the ratio of two frequency components with different optical path lengths based on the output of the frequency extracting section. A defocus amount computing section obtains the defocus amount for the optical system based on the frequency component ratio. A driving section drives the optical system based on the defocus amount obtained. A frequency switching section sets a first frequency as the specific frequency at the frequency extracting section, and based on the frequency ratio for the first frequency, sets a second frequency as the specific frequency.

REFERENCES:
patent: 4414575 (1983-11-01), Yamamoto et al.
patent: 4484806 (1984-11-01), Onishi et al.
patent: 4965443 (1990-10-01), Yamasaki et al.
patent: 4967280 (1990-10-01), Takuma et al.
patent: 4978990 (1990-12-01), Yamasaki et al.
patent: 4990947 (1991-02-01), Komiya et al.
patent: 5070353 (1991-12-01), Komiya et al.
patent: 5146071 (1992-09-01), Ookubo et al.
patent: 5264890 (1993-11-01), Komiya
NHK Technical Report, vol. 17, No. 1, pp. 21-37.

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