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Optical deflector, image displaying apparatus, and object apparatus

  • US 10,459,218 B2
  • Filed: 06/02/2017
  • Issued: 10/29/2019
  • Est. Priority Date: 12/08/2014
  • Status: Active Grant
First Claim
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1. An optical deflector used for optically scanning a target surface, the optical deflector comprising:

  • a mirror device configured to include a mirror configured to oscillate; and

    a casing configured to include a window unit for facing the mirror device, and to accommodate the mirror device,wherein the window unit has a transmissive reflection structure in which part of an incident beam is caused to transmit through the window unit toward the mirror, and at least part of a remainder of the incident beam is reflected by the window unit to a direction separated from an optical deflection range that is deflected by the mirror device,wherein the transmissive reflection structure includes a diffraction grating provided on one of a front surface and a back surface of the window unit, andwherein the diffraction grating is provided in an area of the window unit through which the part of the incident beam passes, and is not provided in another area of the window unit through which the deflected beam that has been deflected by the mirror device passes.

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