Camera

Details Camera Camera

1997-02-14

1998-09-29

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Reliability of focus/distance signal

396125, 396429, 348 64, 348345, G03B 1336, G03B 1748, H04N 718

Patent

active

058157484

ABSTRACT:
To shoot a still picture and a moving picture simultaneously, a light beam having passed through a taking lens is split by a half-mirror into two light beams so that one of the split light beams is directed to silver halide film and the other is directed to a CCD. An image captured by the CCD is displayed on a viewfinder. Focus condition of an image on the silver halide film is detected by the phase-difference detection method and focus condition of an image on CCD is detected by the contrast detection method so that, based on detection results, the focus of the taking lens or of a relay optical system is adjusted to obtain a well-focused image. When focus condition detection by one method is impossible, results of focus condition detection by the other method are used to adjust the focus.

REFERENCES:
patent: 4492449 (1985-01-01), Oinue et al.
patent: 5634162 (1997-05-01), Suzuki

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