Exposure controller of a digital camera

Details Exposure controller of a digital camera Exposure controller of a digital camera

2005-01-04

2005-01-04

Christensen, Andrew (Department: 2615)

Television

Camera, system and detail

Optics

C348S229100, C348S296000, C348S297000, C348S364000, C348S370000, C348S371000

Reexamination Certificate

active

06839087

ABSTRACT:
An exposure controller of a digital camera, using an image pick-up device, includes a photometering sensor, and a control device. The control device calculates a first exposure time in accordance with a photometering value obtained via the photometering sensor, and performs a pre-exposure in which a sensitive surface of the image pick-up device is exposed at a second exposure time shorter than the first exposure time. Thereafter, the control device performs a main exposure in which the sensitive surface of the image pick-up device is exposed at a third exposure time obtained by changing the value of one of the first exposure time and the second exposure time in accordance with a picture signal output from the image pick-up device, the picture signal being output when the image pick-up device is exposed at the second exposure time by the pre-exposure.

REFERENCES:
patent: 4956715 (1990-09-01), Okino et al.
patent: 5473375 (1995-12-01), Takayama et al.
patent: 5541645 (1996-07-01), Davis
patent: 6094537 (2000-07-01), Okazaki et al.
patent: 6426775 (2002-07-01), Kurokawa

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