Focus detecting device with varying pitch cylindrical lens eleme

Details Focus detecting device with varying pitch cylindrical lens eleme Focus detecting device with varying pitch cylindrical lens eleme

1981-07-13

1983-12-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250216, 350433, G01J 136

Patent

active

044195745

ABSTRACT:
In the disclosed focus detecting system, the focusing condition of an objective lens relative to an object is determined by a number of pairs of radiation sensitive elements arranged in a linear array, and a number of lens elements arranged in a linear array corresponding to the linear array of the pairs of radiation sensitive elements. Each lens element is disposed so that one radiation sensitive element in each pair of radiation sensitive elements is arranged to cause one radiation sensitive element in each pair of radiation sensitive elements to receive radiation from a first portion of the objective lens and to cause the other radiation sensitive element to receive radiation from a second portion of the objective lens. The plural lens elements assume the form of a plurality of cylindrical lens elements arranged in a linear array corresponding to the linear array of the pairs of radiation sensitive elements with each of the pitches between successive cylindrical lens elements varying along the longitudinal direction of the cylindrical lens element.

REFERENCES:
patent: 3917414 (1975-11-01), Geis et al.
patent: 4185191 (1980-01-01), Stauffer

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