Focus detecting device

Details Focus detecting device Focus detecting device

1986-06-24

1989-07-18

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250204, G03B 300

Patent

active

048497827

ABSTRACT:
A focus detecting device having a field lens disposed near the predetermined imaging plane of an objective and a secondary imaging optical system disposed rearwardly of the field lens, whereby a pair of object images based on light beams passing through different portions of the pupil of the objective are formed and the respective object images are detected by photoelectric conversion element rows disposed rearwardly of the secondary imaging optical system to thereby discriminate the focus state of the objective from the amount of relative deviation of the object images is characterized in that a refracting portion for refracting the light beam in the direction of arrangement of the photoelectric conversion elements is provided in the secondary imaging optical system.

REFERENCES:
patent: 3682071 (1972-08-01), Hosoe
patent: 4132888 (1979-01-01), Kondo
patent: 4220406 (1980-09-01), Schaefer
patent: 4230401 (1980-10-01), Tokutomi et al.
patent: 4497561 (1985-02-01), Suzuki
patent: 4526458 (1985-07-01), Kawamura et al.
patent: 4561570 (1985-12-01), Matsumura
patent: 4563576 (1986-01-01), Matsumura et al.
patent: 4573784 (1986-03-01), Suzuki
patent: 4659917 (1987-04-01), Suzuki et al.
patent: 4712901 (1987-12-01), Ohtaka et al.

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