Patent
1986-12-24
1989-02-14
Corbin, John K.
35016211, 350163, 350447, 350451, G02B 310, G02B 518, G02B 2700
Patent
active
048042498
ABSTRACT:
An optical filter for use with an imaging lens in an incoherent imaging system operating in broadband illumination for increasing the depth-of-focus of the lens while maintaining energy thru-put is disclosed. The optical filter comprises a transparent support having on one surface thereof an array of transparent, discrete steps of substantially equal size, each step having a thickness that differs from all other steps by at least the coherence length of the radiation to be passed and the size of the array being equal to the size of the lens. In use, the optical filter is positioned in front of the imaging lens. When so positioned, the depth of focus of the imaging lens is proportional to the size of the individual steps rather than the size of the lens while the energy thru-put of the imaging remains the same as it would be without the optical filter.
REFERENCES:
patent: 2959105 (1960-11-01), Sayanagi
Reynolds, G. O., et al, JOSA, 72 (12), Dec., 1982, p. 1746.
Laurin, T., et al, eds., The Optical Industry & Systems Directory, 22 ed., vol. 2, Pittsfield, MA: The Optical Publishing Co., Inc. 1976, p. D-17.
Matsumura, M., "Speckle Noise Reduction by Random Phase Shifters," Japanese Journal of Applied Physics, vol. 13, No. 3, Mar. '74, pp. 557-558 (J102-7404-B.
Mueller Peter F.
Reynolds George O.
Corbin John K.
Edmondson David J.
Honeywell Inc.
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