Focus detecting device

Details Focus detecting device Focus detecting device

1989-08-07

1990-12-04

Adams, Russell E.

354408, G03B 1336

Patent

active

049757270

ABSTRACT:
In a focus detecting device having optical means for forming a plurality of light quantity distributions from light fluxes passing through an objective lens and arrays of sensors arranged to sample the light quantity distributions and to separately produce signals, at least a part of the optical means is made of a material having a moisture absorption expansion coefficient .alpha. which is obtained at 100% humidity relative to 0% humidity and satisfies the following condition:

REFERENCES:
patent: 4335959 (1982-06-01), Manning
patent: 4474448 (1984-10-01), Momiyama
patent: 4559446 (1985-12-01), Suzuki
patent: 4650309 (1987-03-01), Ishida et al.
patent: 4662735 (1987-05-01), Karasaki et al.

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