Optical low pass filter utilizing a phase grating

Details Optical low pass filter utilizing a phase grating Optical low pass filter utilizing a phase grating

1985-12-20

1989-01-03

Arnold, Bruce Y.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358331, G02B 518, H04N 907

Patent

active

047952369

ABSTRACT:
An optical low pass filter including a phase grating, wherein the grating is implanted inwardly from the surface of a substrate, the grating having a uniform repetitive period and having a refractive index different from that of the substrate.

REFERENCES:
patent: 3821795 (1974-06-01), Okano
patent: 3910683 (1975-10-01), Nishino et al.
patent: 4009939 (1977-03-01), Okano
patent: 4178611 (1979-12-01), Okano
Oldengarm, J., "Development of Rotating Diffraction Gratings and Their Use in Laser Anemometry", Optics and Laser Technology, vol. 9, No. 2, Apr. 1977, pp. 69-71.
Mino et al, "Optical Low-Pass Filter for a Single-Vidicon Color Television Camera", Journal of the SMPTE, Apr. 1972, vol. 81, pp. 282-285.
Townsend, "Spatial-Frequency Filter for a Kell-Type Color Camera", Nov. 1972 issue of Applied Physics, vol. 11, No. 11, pp. 2463-2471.
Oikawa et al, article "Distributed-index Planar Microlens", Mar. 15, 1982 issued of Applied Physics, vol. 21, No. 6, pp. 1052-1056.

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