Compact focus detecting device

Details Compact focus detecting device Compact focus detecting device

1992-12-23

1994-09-06

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

2502018, G03B 1336

Patent

active

053452917

ABSTRACT:
A focus detecting device comprising a condenser lens disposed in the vicinity of a predetermined image surface of a photographic lens system, separator lenses disposed on the side of emergence of the condenser lens and functioning to partially separate a pair of light bundles having passed through different regions respectively of the photographic lens system. The focus detecting device can use, in place of the separator lenses, a reimaging lens having reflecting surfaces which can function also as aperture stops and are formed on a plane including a center of curvature of the surface thereof. This focus detecting device can be made compact and is capable of detecting a focus point with high accuracy.

REFERENCES:
patent: 4949116 (1990-08-01), Karasaki et al.
patent: 4959677 (1990-09-01), Suda et al.

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