Diffractive phase filter having near field wavelength dependent

Details Diffractive phase filter having near field wavelength dependent Diffractive phase filter having near field wavelength dependent

1976-01-08

1978-03-14

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 44, 358 55, 350162R, 594100, H04N 907, H04N 584, G02B 518, G03B 3300

Patent

active

040794113

ABSTRACT:
A phase grating structure is defined in which a series of predetermined sawtooth phase delay steps has the property of focusing respective wavelength components of a spectrum of incident wave energy in accordance with their wavelength at different spots in the near field. Although not limited thereto, the invention has particular utility for spatially separating the color components of polychromatic light. Useful applications for this phase filter include (1) recording color pictures on black-and-white film for display in full color, and (2) a single-gun color television camera.

REFERENCES:
patent: 666424 (1901-01-01), Ives
patent: 2124139 (1938-07-01), Eggert et al.
patent: 2309626 (1943-02-01), Conrad

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