Optical low-pass filter

Details Optical low-pass filter Optical low-pass filter

1986-04-04

1987-01-06

Arnold, Bruce Y.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358251, G02B 518, H04N 572

Patent

active

046342192

ABSTRACT:
An optical low-pass filter has a diffraction grating structure wherein flat faces which are perpendicular to the optical axis of an imaging lens and slanting faces which are slanting relative to the flat faces are at a predetermined pitch.

REFERENCES:
patent: 3821795 (1974-06-01), Okano

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