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Prism unit

  • US 10,437,008 B2
  • Filed: 07/28/2017
  • Issued: 10/08/2019
  • Est. Priority Date: 01/30/2015
  • Status: Active Grant
First Claim
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1. A prism unit comprising:

  • a composite prism that includes a first prism block and a second prism block bonded to each other, the first prism block including at least one prism and the second prism block including at least one prism;

    a first base plate that comprises a first adhesive portion and a first base-fixing portion, the first prism block being bonded to the first adhesive portion;

    a second base plate that comprises a second adhesive portion and a second base-fixing portion, the second prism block being bonded to the second adhesive portion; and

    a base that comprises a first base plate-fixing portion and a second base plate-fixing portion, the first base-fixing portion of the first base plate being fixed to the first base plate-fixing portion and the second base-fixing portion of the second base plate being fixed to the second base plate-fixing portion,wherein the second adhesive portion is disposed between the first base plate-fixing portion and the second base plate-fixing portion, and a direction in which the second base plate-fixing portion is displaced from the first base plate-fixing portion and a direction in which the second adhesive portion is displaced from the second base-fixing portion are opposite to each other in a case in which the base and the second base plate expand or contract due to a change in temperature,in a case in which a line passing through a center of a panel surface of an image forming panel adjacent to the composite prism and perpendicular to the panel surface is set as an optical axis, the first and second prism blocks of the composite prism are bonded to each other so as to form an air layer in a region including the optical axis, andthe first and second prism blocks of the composite prism are bonded to each other with a spacer interposed therebetween in a region other than the region including the optical axis.

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