Auxiliary light projecting apparatus for a focus detecting syste

Details Auxiliary light projecting apparatus for a focus detecting syste Auxiliary light projecting apparatus for a focus detecting syste

1987-03-25

1988-09-13

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, 250552, 250237G, G03B 300

Patent

active

047713089

ABSTRACT:
An auxiliary light source for a passive focus detector, such as would be used for automatic focusing. A projection lens is inclined with respect to the imaging lens and projects a patterned image from a surface inclined with respect to the projection lens. Preferably the patterned image is projected to lie along the axis of the imaging lens so that a sharp illumination pattern is formed at all distances along that axis. Preferably the pattern is such that a higher intensity portion is imaged at a far distance and a lower intensity portion is imaged at a near distance.

REFERENCES:
patent: 4150888 (1979-04-01), Filipovich
patent: 4255029 (1981-03-01), Freudenschuss
patent: 4394077 (1983-07-01), Yoshino et al.
patent: 4494868 (1985-01-01), Lambeth
patent: 4690538 (1987-09-01), Matsui et al.

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