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US 12,717,140 B2Granted
Optical member, virtual image display device, and measurement method for optical member
AssigneeSeiko Epson Corporation
InventorsToshiaki Miyao, Toshiyuki Noguchi, Mitsutaka Ide
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Abstract
An optical member includes a plurality of optically effective surfaces, and a plurality of measurement reference members that are associated with the plurality of optically effective surfaces and each of which serves as a reference for positioning of the plurality of optically effective surfaces. In this case, a relative positional relationship of the optically effective surfaces can be determined, and the optical performance of the optical member can be accurately evaluated.
Claims11
An optical member comprising:
- a first optically effective surface;
- a second optically effective surface;
- and
- a wedge-shaped protrusion portion sandwiched between the first optically effective surface and the second optically effective surface;
- wherein an optical axis of the first optically effective surface and an optical axis of the second optically effective surface form an angle greater than 90 degrees and less than 180 degrees, and
- the wedge-shaped protrusion portion includes a first reference surface serving as a reference for positioning the first optically effective surface and a second reference surface serving as a reference for positioning the second optically effective surface, the first reference surface and the second reference surface facing each other and forming an angle greater than 0 degrees and less than 90 degrees.
3 more elements
Dependencies are inferred from the claim text.