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Optical measuring device having d.c. component elimination

  • US 6,922,577 B2
  • Filed: 02/10/2003
  • Issued: 07/26/2005
  • Est. Priority Date: 02/15/2002
  • Status: Active Grant
First Claim
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1. An optical measuring device, comprising:

  • a sensor having a light emitting element which emits light flashes to a subject of detection by being supplied with electric power from a battery for a prescribed duration at prescribed intervals and a light sensitive element which receives reflected light from the subject;

    a subtractor which subtracts a d.c. component from a sensed signal provided by the light sensitive element, thereby extracting a variation component;

    an amplifier which amplifies an output signal of the subtractor;

    an A/D converter which implements an A/D conversion for an output signal of the amplifier; and

    a d.c. component modifying means which modifies a d.c. component level based on an A/D-converted value of the sensed signal provided by the light sensitive element.

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