Composite filter and illuminating device

Details Composite filter and illuminating device Composite filter and illuminating device

1990-12-31

1992-05-19

Lazarus, Ira S.

Illumination

Illuminated scale or dial

362293, 362 30, 359350, 359890, G01D 1128

Patent

active

051153793

ABSTRACT:
A composite filter advantageously employable for dark field observation systems which comprises a dyed organic resin layer provided on a dyed glass plate. The organic resin layer and the glass plate in combination absorb light of a radiation spectrum in the region of longer than 600 nm under the condition that the transmission of light at 650 nm is defined to a level of 1.times.10.sup.-4 % to 5% and the transmission of light at 800 nm is defined to a level of lower than 2.times.10.sup.-5 %. Another dyed glass plate which shows an absorption spectrum having absorption peaks in regions of 480-535 nm and 560-600 nm may be incorporated into the composite filter. The composite filter can be introduced into or provided to an illuminating device.

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"Schott Optical Color Filter Glass", Schott Optical Glass, Inc. Oct. 1970, 35 pages.
"Infrared transmission of several Non-Silicate Glass Systems", The Glass Industry, by Lin, Francis Li; vol. 44, No. 2 pp. 87-91 Feb. 1963.

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