Automatic focusing system for a camera having a range finder

Details Automatic focusing system for a camera having a range finder Automatic focusing system for a camera having a range finder

1992-04-09

1993-12-14

Perkey, W. B.

G03B 1336

Patent

active

052707652

ABSTRACT:
In an automatic focusing system, a rangefinder unit is provided with a spot-beam projecting lens and a reflected spot-beam receiving lens which are disposed on the front of the rangefinder case with the space of the base length therebetween in the vertical direction, and a spot-beam emitting device and a reflected spot-beam receiving device which are disposed on the back of the case which is separated from its front by the focal distance of the lenses. The rangefinder unit is moved to scan a subject in a direction perpendicular to the base line, thereby permitting movement of the rangefinder unit to be made small. The automatic focusing system can be made compact and exclude the influence of an error in contrast due to partial return spot-beam images on the spot-beam receiving element.

REFERENCES:
patent: 3720148 (1973-03-01), Harvey
patent: 4470681 (1984-09-01), Johnson
patent: 4571048 (1986-02-01), Sugawara
patent: 4740806 (1988-04-01), Takehana
patent: 4827303 (1989-05-01), Tsuboi
patent: 5137350 (1992-08-01), Misawa et al.

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