Focus state detection device

Details Focus state detection device Focus state detection device

1994-12-27

1996-08-13

Perkey, W. B.

G03B 1336

Patent

active

055461573

ABSTRACT:
A focus detection device includes a sensor for detecting focus in at least two regions of an image field. The device further includes a photographic lens for receiving light from a source in the image field, and a field lens for receiving light from the photographic lens. The field lens is disposed between the photographic lens and the sensor, and includes a plurality of field lens elements for receiving light from the regions of the image field. At least two of the field lens elements are adjacent field lens elements corresponding to adjacent regions of the image field. The adjacent field lens elements are separated by a space to deflect stray light. A method of use also is described.

REFERENCES:
patent: 4857718 (1989-08-01), Karasaki et al.
patent: 5138359 (1992-08-01), Nagano et al.
patent: 5227833 (1993-07-01), Ishida et al.

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