Optical system for a single-lens reflex type video still camera

Details Optical system for a single-lens reflex type video still camera Optical system for a single-lens reflex type video still camera

1986-10-09

1988-07-12

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821313, 358909, H04N 5225, H04N 314

Patent

active

047573872

ABSTRACT:
A video still camera of the single lens reflex type is provided having a movable finder mirror for reflecting light passed through an objective lens, and a movable optical low-pass filter for preventing a light component having a spatial frequency lower than a predetermined value from being incident on an image receiving element. The finder mirror is located at a position in a photographing path through which photographing light passes when the camera is in a finder observation condition, while the optical low-pass filter is located at that position instead of the finder mirror when the camera is in a photographing condition. A driving device for selectively positioning either the finder mirror or the optical low-pass filter at the position is provided. The compactness of the video still camera is improved.

REFERENCES:
patent: 4554585 (1985-11-01), Carlson
patent: 4626918 (1986-12-01), Marisawa
patent: 4677489 (1987-06-01), Nishimura et al.
patent: 4682237 (1987-07-01), Kato et al.
ITI Technical Report, vol. 8, No. 35, TEBS100-4, Dec. 1984.

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