Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1978-09-14
1980-10-07
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 904
Patent
active
042272084
ABSTRACT:
An optical comb filter has a plurality of optical comb filter elements disposed successively in the advancing direction of light. The optical comb filter characteristics attenuate and remove specific space frequencies which do not have mutual relationships of odd-number multiples and frequencies of the specific space frequencies. At least one phase plate is interposed between neighboring optical comb filter elements in front and rear positions with respect to the light advancing direction. The phase plate converts a light exiting from the front filter element into a light which is divided in the rear filter element into normal light and abnormal light, exiting with mutually equal light quantity. The normal and abnormal light enters, as incident light, the rear filter element.
REFERENCES:
patent: 3784734 (1974-01-01), Watanabe et al.
patent: 3940788 (1976-02-01), Abe et al.
patent: 4100570 (1978-07-01), Nobutoki et al.
Miyazaki Ken-ichi
Miyoshi Tadayoshi
Motoyama Koichiro
Nakagaki Shintaro
Takanashi Itsuo
Murray Richard
Victor Company of Japan Ltd.
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