Optical low-pass filter and photographic system using the same

Details Optical low-pass filter and photographic system using the same Optical low-pass filter and photographic system using the same

1989-07-13

1991-03-12

Arnold, Bruce Y.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

350167, 350311, 358331, G02B 518, G02B 520, H04N 907

Patent

active

049988018

ABSTRACT:
An optical low-pass filter formed in a trapezoid wave profile having the top and bottom sides of lengths "a" and "b" respectively, a height ".delta." thereof and a length of one period thereof and made from a material having a refractive index "n", and satisfying the following conditions: for a wavelength of .lambda..sub.M .gtoreq.1.6 .lambda.m, ##EQU1## wherein .lambda..sub.M and .lambda.m are respectively maximum and minimum wavelengths in a wavelength range in which the filter works, and MIN(x,y) represents the smaller one of values which variables x and y take.

REFERENCES:
patent: 2182993 (1939-12-01), Moreno
patent: 2605434 (1952-07-01), Homrighous
patent: 3781091 (1973-12-01), Ferguson
patent: 3784734 (1974-01-01), Watanabe et al.
patent: 3821795 (1974-06-01), Okano
patent: 3940788 (1976-02-01), Abe et al.
patent: 4330175 (1982-05-01), Fujii et al.
patent: 4405405 (1983-09-01), Fujii et al.
patent: 4634219 (1987-01-01), Suzuki
patent: 4759607 (1988-07-01), Kawatsuki et al.
patent: 4795236 (1989-01-01), Ise
Savitskii et al, "Efficiency Optimization of Reflecting Diffraction Graftings with a Trapezoidal Grating Profile," Opt. Spectrosc., vol. 59, No. 2, USSR, Aug. 1985, pp. 251-254.

Affiliated with

Also associated with

Rating

Optical low-pass filter and photographic system using the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical low-pass filter and photographic system using the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical low-pass filter and photographic system using the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-444726