Focal sensor having optical low pass filter

Details Focal sensor having optical low pass filter Focal sensor having optical low pass filter

1982-06-30

1984-10-02

Perkey, William B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354479, 250204, 250237G, 350311, 35016224, G03B 708, G01J 142, G02B 518, G02B 520

Patent

active

044744463

ABSTRACT:
A system having a scaled anti-aliasing random phase filter for use in optical imaging systems having a sampled focal plane or an automatic focussing device. The filter is scaled so that it may be placed near the focal plane or automatic focus sensing device, yet produce the effect of an anti-aliasing filter at the exit pupil of the optical system. In one example, the filter includes a scaled hologram of a Sayanagi filter located at the exit pupil. In a second example, the filter includes a scaled double chirped diffraction grating.

REFERENCES:
patent: 3402001 (1968-09-01), Fleisher
patent: 3631360 (1971-12-01), Lehovec
patent: 3904869 (1975-09-01), Stauffer
patent: 4048492 (1977-09-01), Hartmann
patent: 4132888 (1979-01-01), Kondo
patent: 4247763 (1981-01-01), Stauffer
"Electronic Focus for Cameras", Stauffer et al., Scientific Honeyweller, vol. 3, No. 1, Mar. 1982, pp. 1-13.

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