Optical low pass filter

Details Optical low pass filter Optical low pass filter

1989-04-03

1991-03-12

Arnold, Bruce Y.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

35016219, 358 47, 358331, G02B 2760

Patent

active

049988000

ABSTRACT:
An optical low pass filter for use in an imaging device including an objective lens and a solid state image sensor forming a plurality of picture elements thereon, which filter comprises a diffraction grating disposed between the objective lens and the solid state image sensor. The diffraction grating is of a type which the periodicity of an image of the diffraction grating projected onto the solid state image sensor by the objective lens is selected to be twice or 1
of the periodicity of the picture element, wherein n represents an integer. The applicable imaging device may be of a type comprising an objective lens, a solid state image sensor forming a plurality of picture elements thereon, and a color filter array disposed on the solid state image snesor and including a plurality of sets of different color filter elements, or of a type comprising a single tube type color imaging device having an evacuated glass envelope, an objective lens and a color filter array including a plurality of sets of different color filter elements.

REFERENCES:
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patent: 3768888 (1973-10-01), Nishino et al.
patent: 3821795 (1974-06-01), Okano
patent: 3910683 (1975-10-01), Nishino et al.
patent: 3940788 (1976-02-01), Abe et al.
patent: 4093346 (1978-06-01), Nishino et al.
patent: 4178611 (1979-12-01), Okano
patent: 4255019 (1981-03-01), Knop
patent: 4795236 (1989-01-01), Ise
patent: 4850673 (1989-07-01), Velzel et al.

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