Optical filter device

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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358 61, 358253, G02B 520, H04N 572

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active

045154422

ABSTRACT:
An optical filter device is disclosed made up of a specially designed bandpass filter and a circularly polarizing filter and is typically used in front of the faceplate of a cathode ray tube in a high intensity ambient light environment, such as with navigation displays in some aircraft cockpits, to reduce the high intensity ambient light striking the phosphor of the cathode ray tube and thus effect a reduction in the level of the scattered light that causes a washout of the display thereon, thereby permitting observation of the display on the tube.

REFERENCES:
patent: 3518373 (1970-06-01), Cushera et al.
patent: 3537306 (1970-11-01), Bedinger
patent: 3585281 (1971-06-01), Jordan
IBM Technical Disclosure Bulletin, vol. 12, No. 10, Mar. 1970, pp. 1709-1710, New York L. B. Ii: "High-Contrast Filter".
IBM Technical Disclosure Bulletin, vol. 16, No. 3, Aug. 1973, pp. 745-746, New York, H. M. Murphy: "High-Contrast Optical Bandpass Filter".
IBM Technical Disclosure Bulletin, vol. 13, No. 5, Oct. 1970, pp. 1391-1392, New York, R. H. Mancini: "High Contrast Filter System".
Proceedings of the Society for Information Display, No. 7, Oct. 1966, pp. 47-49, Los Angeles K. P. Lally et al.: "Non-Linear Optical Filters for High Contrast Displays".
Military Standardization Handbook, "Optical Design", MIL-HDBK-141, Oct. 5, 1962.

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