Compact focus detecting device suitable for incorporation into a

Details Compact focus detecting device suitable for incorporation into a Compact focus detecting device suitable for incorporation into a

1992-01-22

1993-11-16

Gray, David M.

354407, G03B 1300

Patent

active

052628191

ABSTRACT:
A compact focus detecting device featuring increased optical paths includes a first detecting system having first light intensity distribution forming structure for forming a light beam passing through the objective lens a light intensity distribution of which varies in relative position according to the focus state of the objective lens. A first light receiving sensor receives the first light intensity distribution and outputs a first signal indicative of the focused state of the objective lens. The first detecting system has a first detection field and a first optical path. A second detecting system has a second detecting field with a center spaced apart from the center of the first detection field, and a second optical path. The second detecting system includes second light intensity distribution forming structure for forming from the light beam passing through the objective lens a light intensity distribution which varies in relative position according to the focused state of the objective lens. A second light receiving sensor receives the second light intensity distribution and outputs a second signal indicative of the focus state of the objective lens. A light transmitting optical member is provided for adjusting the length of the first and second optical paths. Preferably, the optical member comprises a block having an internal reflecting surface.

REFERENCES:
patent: 4774539 (1988-09-01), Suda et al.
patent: 4841326 (1989-06-01), Koyama et al.
patent: 4859842 (1989-08-01), Suda et al.
patent: 4878078 (1989-11-01), Koyama et al.
patent: 4901102 (1990-02-01), Karasaki et al.
patent: 4908504 (1990-03-01), Karasaki et al.
patent: 4954701 (1990-09-01), Suzuki et al.
patent: 4959677 (1990-09-01), Suda et al.
patent: 4992819 (1991-02-01), Ohtaka et al.
patent: 5109154 (1992-04-01), Higashihara et al.

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