Device for splitting light from an objective lens

Details Device for splitting light from an objective lens Device for splitting light from an objective lens

1981-12-23

1984-08-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250227, G01J 136

Patent

active

044671881

ABSTRACT:
A phase type diffraction grating and a microprism for splitting the light beam from an objective lens into three light beams. The three light beams are split in one direction by the diffraction grating and are directed onto three rows of line sensors disposed on the same plane. In the two optical paths between the diffraction grating and the line sensors, there is disposed an optical path length difference imparting element for forming on the line sensors images at a predetermined focal plane of the objective lens and planes forward and rearward of the predetermined focal plane. Thus, the line sensors detect the images at the predetermined focal plane and at planes forward and rearward of the predetermined focal plane.

REFERENCES:
patent: 3791719 (1974-02-01), Kratzer et al.
patent: 3925603 (1975-12-01), Naruse et al.
patent: 3967109 (1976-06-01), Amos et al.
patent: 4047022 (1977-09-01), Holle
patent: 4185191 (1980-01-01), Stauffer
patent: 4230942 (1980-10-01), Stauffer

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