Automatic zoom camera and driving method therefor

Details Automatic zoom camera and driving method therefor Automatic zoom camera and driving method therefor

1993-05-05

1994-10-18

Perkey, W. B.

354412, 354419, 3541271, G03B 500, G03B 1336, G03B 1505

Patent

active

053573080

ABSTRACT:
An automatic zoom camera and driving method therefor by which a user can take an optimal photograph, while controlling a zoom operation by synthetically controlling a shading of a picture and a change of colour varied in response to a zoom operation in accordance with a distance of an object, sensitivity of a film, environmental brightness and a brightness index of a strobe, while operating a zoom function. The automatic zoom camera is constituted by a switch block to sense information about an automatic zoom mode, a strobe mode, a sensitivity of film and a zoom position. In addition, the camera is able to sense the distance of an object via an infrared-emitting element and a light receiving element; information about an environmental brightness via a photoconductive cell; and a micro controller to minimize changes of colour and shading of a photograph in accordance with the distance of the object, the sensitivity of the film, the environmental brightness and a strobe brightness index, while automatically carrying out the zooming operation in case the operation mode is an automatic zoom mode. A flash driving circuit is used for compensating a lack of sufficient light by driving the strobe in response to an output signal of the micro controller; and a motor driving circuit and a shutter driving circuit for automatically adjusting a focus are driven for adjusting an exposure value, taking a photograph and advancing the film in response to the output signal of the micro controller.

REFERENCES:
patent: 4777508 (1988-10-01), Aoshima
patent: 4829331 (1989-05-01), Aihara
patent: 4942417 (1990-07-01), Miyazawa et al.
patent: 5119122 (1992-06-01), Kudo et al.

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