Focus detecting system

Details Focus detecting system Focus detecting system

1986-12-15

1989-01-31

Hix, L. T.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354126, 250201, G03B 300, G03B 1503

Patent

active

048019631

ABSTRACT:
A focus detecting system having a focus detecting apparatus for performing focus detection based on the output signal from a photo-sensing device, and a pattern projector for projecting a pattern onto an object, wherein the aforesaid pattern is so arranged that the spatial frequency lowers successively.

REFERENCES:
patent: 2642790 (1953-06-01), Scholkemeier
patent: 3418908 (1968-12-01), Land
patent: 4185191 (1980-01-01), Stauffer
patent: 4690538 (1987-09-01), Matsui et al.

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