Distance measuring apparatus of camera improved in measuring pro

Details Distance measuring apparatus of camera improved in measuring pro Distance measuring apparatus of camera improved in measuring pro

1997-01-17

1998-02-24

Adams, Russell E.

Photography

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

Lens characteristic compensating

396 96, 396128, G03B 1336

Patent

active

057219770

ABSTRACT:
A distance measuring apparatus includes a pair of line sensors. An image of an object is projected on the line sensor through a lens. The distance up to an object is measured according to the object image in the line sensor. The line sensor includes a plurality of pixels (CCD). The time period for respective pixels to complete charge accumulation with the pixel first completing charge accumulation as the pixel of quantizing reference becomes the data for the respective pixels. In the present invention, the range of pixels used for quantizing reference is altered according to variation in the focal length of the lens. The operation of distance measurement is terminated when charge accumulation for all the pixels within the range of the integration completion determination ends. The range of integration completion determination is altered according to the focal length, the measured brightness value and the shooting mode.

REFERENCES:
patent: 4469417 (1984-09-01), Masunaga et al.
patent: 4475800 (1984-10-01), Kinoshita et al.
patent: 4870441 (1989-09-01), Yamasaki
patent: 4952963 (1990-08-01), Akashi
patent: 4952966 (1990-08-01), Ishida et al.
patent: 5051767 (1991-09-01), Honma et al.

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