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Life expiration detector for light source of image processing apparatus

  • US 4,952,972 A
  • Filed: 10/24/1989
  • Issued: 08/28/1990
  • Est. Priority Date: 10/26/1988
  • Status: Expired due to Fees
First Claim
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1. An apparatus for detecting a life expiration of a light source comprising:

  • means for sensing at least two color components of light obtained from the light source to provide a first color component signal and second color component signal;

    means for detecting a first amount of said first color component signal and a second amount of said second color component signal;

    means for comparing said first amount with said second amount to detect a specific relation between said first and second amounts; and

    means for referring said specific relation to a predetermined value to determine whether or not a life of said light source is expired, and indicating a life expiration of said light source when said specific relation matches said predetermined value.

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