Focus condition detecting device

Details Focus condition detecting device Focus condition detecting device

1988-05-13

1990-02-20

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250204, G03B 300

Patent

active

049030655

ABSTRACT:
A focus condition detecting device which eliminates a wasteful operation thereof to obtain optical results of detection in a shortest period of time and wherein it can be discriminated correctly depending upon data read from a lens regarding an exit pupil of the lens whether or not detection of a focus condition is possible. The device comprises an optical means which forms a plurality of pairs of light images from beams of light from pairs of areas of an exit pupil plane of an interchangeable lens. Relative displacements between the light images are detected by a plurality of focus condition detecting means. Data regarding optical characteristics of the lens are read from the lens, and in accordance with the data thus read, those ones of the focus condition detecting means for which detection of a focus condition is possible are selected from an optical relationship between the optical means and the exit pupil of the lens. An in-focus condition is finally determined from focus condition signals produced from the selected focus condition detecting means.

REFERENCES:
patent: 4306787 (1981-12-01), Fukuhara et al.
patent: 4346970 (1982-08-01), Kawabata et al.
patent: 4613748 (1986-09-01), Imai
patent: 4687917 (1987-08-01), Kusaka et al.
patent: 4768052 (1988-08-01), Hamada et al.
patent: 4774540 (1988-09-01), Taniguchi et al.

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