Optical low-pass filter
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United States of America Patent
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-
Aug 17, 1993
Issued Date -
N/A
app pub date -
Jun 12, 1990
filing date -
Apr 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical low-pass filter comprising at least two boundary surfaces arranged substantially parallel to each other which can split incident light into two components or reflect it and at least one of which has color dependency, in order to make it possible to be favorably used to an objective optical system for for endoscopes, to have wavelength dependency to response, and to minimize the generation of color moire. The optical low-pass filter is constructed in the form of various shaped prisms and can also have two-dimensional filter characteristics.
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