Optical sensor device

  • US 5,844,682 A
  • Filed: 03/20/1995
  • Issued: 12/01/1998
  • Est. Priority Date: 03/25/1994
  • Status: Expired due to Fees
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First Claim
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1. An optical sensor device comprising:

  • a light-projecting optical system for projecting light toward an object to be sensed, said projected light having the characteristic that it is not separated into a plurality of polarized light beams by said light-projecting optical system; and

    a light-receiving optical system upon which reflected light, transmitted light or scattered light from the object to be sensed impinges;

    said light-projecting optical system including at least a light-emitting element for outputting projected light; and

    said light-receiving optical system including;

    a polarization beam splitter for separating the reflected light, transmitted light or scattered light from the object into a first luminous flux which is mainly an s-polarized component with regard to the plane of incidence and a second luminous flux which is mainly a p-polarized component with regard to the plane of incidence, said polarization beam splitter having a light separating characteristic that is substantially constant within a range of angles of incidence used;

    a first light-receiving element for receiving the first luminous flux; and

    a second light-receiving element for receiving the second luminous flux.

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