Camera

Details Camera Camera

2005-08-09

2005-08-09

Perkey, W. B. (Department: 2851)

Photography

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

Having auxiliary illumination

C396S120000, C396S243000

Reexamination Certificate

active

06928240

ABSTRACT:
A camera includes a light emitter, a light detector, a clamp circuit, a calculator for outputting an output ratio signal, a converter for converting the output ratio signal into a distance signal corresponding to the distance or a predetermined fixed value, a light meter for measuring the luminance of outside light, and an exposure control that, when the luminance of the outside light measured by the light meter is lower than a predetermined switchover luminance, controls the aperture of the camera lens to a released aperture value, and when higher than the predetermined switchover luminance, controls the aperture of the camera lens to increase corresponding to the luminance. A first auto-focus (AF) signal value corresponds to an infinity determination distance and a second AF signal value corresponds to the switchover luminance. The AF signal value, which corresponds to the shorter range, is set as an infinity determination threshold value.

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patent: 6026246 (2000-02-01), Yoshida et al.
patent: 6421115 (2002-07-01), Yoshida et al.
patent: 2-67529 (1990-07-01), None

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