Optical filter, optical filter module, spectrometric instrument, and optical instrument
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United States of America Patent
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Aug 26, 2014
Grant Date -
Feb 23, 2012
app pub date -
Aug 17, 2011
filing date -
Aug 20, 2010
priority date (Note) -
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Abstract
An Etalon filter includes a first substrate, a second substrate which faces the first substrate, a first optical film which is provided on the first substrate, and a second optical film which is provided on the second substrate to face the first optical film. The reflective characteristic of the first optical film determined by the reflectance of light of each wavelength in a reflective band is different from the reflective characteristic of the second optical film determined by the reflectance of light of each wavelength in the reflective band. The first optical film can have a reflective characteristic with a first wavelength λ1 as a center wavelength, and the second optical film can have a reflective characteristic with a second wavelength λ2 different from the first wavelength as a center wavelength.
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