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Filter for light receiving element, and light receiving device

  • US 8,369,007 B2
  • Filed: 09/09/2011
  • Issued: 02/05/2013
  • Est. Priority Date: 03/13/2009
  • Status: Active Grant
First Claim
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1. A filter for a light receiving element which receives signal light with a known spectral distributionwherein when energy density of ambient light in the light receiving element is represented as N1 and energy density of signal light in the light receiving element is represented as N2, a ratio of an amount of light which passes through the filter to an amount of light which enters the filter is determined in a range from 70% to 87% such that N1/(N2)2 is minimized while changing a ratio of an amount of light which passes through the filter to an amount of light which enters the filter by changing the transmittance versus wavelength characteristic of the filter.

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