Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1994-11-02
1996-07-09
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
25055938, 356 404, 356375, 354403, G02B 704
Patent
active
055346871
ABSTRACT:
In order to provide a focus detecting optical system of the active type which is capable of effecting good focus detection and enables a space to be effectively used, the focus detecting optical system of the present invention is a focus detecting optical system provided with a light projecting system for applying a beam of light emitted from a light emission source to an object through a light projecting lens. A light receiving surface condenses the reflected beam of light from the object on a light receiving element through a light receiving lens, and measures the distance to the object on the basis of a change in the imaged position on the light receiving element to thereby detect the focus position. The light emission source is positioned with eccentricity by a predetermined distance from the center of the outer diameter of the light projecting lens in a direction orthogonal to the direction of a base length. The paraxial curvature center position of at least one lens surface of the light projecting lens is positioned with eccentricity by a predetermined distance from the center of the outer diameter of the lens in the direction orthogonal to the direction of the base length.
REFERENCES:
patent: 4730293 (1988-03-01), Pierce et al.
patent: 4907026 (1990-03-01), Koyama et al.
patent: 5137350 (1992-08-01), Misawa et al.
Calogero Stephen
Nikon Corporation
Westin Edward P.
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