Interference film filter for copying machine
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United States of America Patent
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Aug 18, 1992
Grant Date -
N/A
app pub date -
Oct 13, 1989
filing date -
Oct 15, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An interference film filter for use in a copying machine as mounted on an optical path of light traveling through an image-forming lens for preventing transmission of the light in a predetermined wavelength range. The filter comprises a transparent glass substrate, and interference films each consisting of a plurality of layers formed by vapor deposition on the substrate. The interference films include a film disposed centrally of the substrate, and an opposed pair or pairs side films. Each of the side films has a greater optical film thickness than the center film or a film disposed immediately inwardly.
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