Focal point detecting optical apparatus

Details Focal point detecting optical apparatus Focal point detecting optical apparatus

1989-03-17

1991-05-21

Evans, F. L.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

2502012, 354402, G01B 900, G02B 709

Patent

active

050170058

ABSTRACT:
A focal point detecting optical apparatus has a focal point detecting optical system on an optical axis for reimaging a portion of a primary image formed in the vicinity of an optical axis through a taking lens on a row of light receiving elements linearly arranged by as a pair of images and detecting a focusing state in the vicinity of the optical axis; a focal point detecting optical system outside an optical axis for reimaging a portion of the primary image formed outside the optical axis on the row of light receiving elements and detecting a focusing state outside the optical axis; and light deflecting means disposed in the vicinity of an imaging surface on which the primary image is formed and deflecting beam of light outside the optical axis toward the optical axis side.

REFERENCES:
patent: 4185191 (1980-01-01), Stauffer
patent: 4563576 (1986-01-01), Matsumura et al.
English translation of the Abstract for Japanese Patent No. 61-157046.
English translation of the Abstract for Japanese Patent No. 63-013010.

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