Focus detection device having infrared filter

Details Focus detection device having infrared filter Focus detection device having infrared filter

1994-10-19

1996-03-19

Gellner, Michael L.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354407, 354408, 2502011, G03B 300

Patent

active

055007082

ABSTRACT:
A focus detection device includes an infrared reduction filter positioned behind the field lens between, the field lens and any secondary imaging lenses. Preferably, the infrared reduction filter is positioned closely adjacent to the field lens, i.e., closer to the field lens than to the secondary imaging lenses, usually between the field lens and any deflection mirror that might be located between the field lens and the secondary imaging lenses.

REFERENCES:
patent: 4634255 (1987-01-01), Suda et al.
patent: 4843227 (1989-06-01), Matsui et al.

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