Camera having improved positioning of a variable aperture

Details Camera having improved positioning of a variable aperture Camera having improved positioning of a variable aperture

1994-11-04

1995-10-17

Greening, Wendy R.

Television

Camera, system and detail

Optics

348363, 348341, 354219, 354410, H04N 5232

Patent

active

054595118

ABSTRACT:
A camera having improved positioning of a variable aperture. A picture taking lens forms an image of a subject on an image forming plane. A picture taking optical system has a picture taking optical path which extends from the image forming plane to an image recording medium. The picture taking optical system receives the image formed on the image forming plane and projects the image to the image recording medium. A variable aperture is positioned in the picture taking optical path between the image forming plane and the image recording medium, and regulates light passing through the picture taking optical system without regulating light passing through a viewfinder optical system. Before an individual photograph is taken, the variable aperture is set to an aperture size which is approximately midway between the maximum aperture size and the minimum aperture size. However, when the camera is in a continuous shooting mode, a variable aperture control device sets the variable aperture to a first aperture size before a first photograph is taken and then, after the first photograph is taken, drives the variable aperture directly to a new aperture size corresponding to the next photograph. The camera also controls the camera shutter to be released after a specific, constant time from the pressing of the release button.

REFERENCES:
patent: 4544250 (1985-10-01), Tanaka et al.
patent: 4623932 (1986-11-01), Inoue et al.
patent: 4918538 (1990-04-01), Saito et al.
patent: 5115319 (1992-05-01), Arai et al.

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