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US 8,475,011 B2Granted
Lens member and optical unit using said lens member
AssigneesCitizen Electronics Co., Ltd., Citizen Holdings Co., Ltd.
InventorYasuaki Kayanuma
Life of this patent
Estimating the term…
Abstract
A lens member includes at least one of the annular prisms including a facet at an edge between an inner annular surface and an outer surface of the at least one of the annular prisms. The prisms with facets may be provided at a central portion of the lens member and the facets are configured to refract light toward a light-exit side of the lens member.
Claims17
A lens member comprising:
- a light-entry side including a central axis and a concave shape with the central axis centered;
- a light-exit side opposite to the light-entry side;
- a plurality of annular prisms provided on the light-entry side and concentric with the central axis of the light-entry side, the plurality of annular prisms each including an inner annular surface and an outer annular surface that is positioned outside of the inner annular surface to form each of the prisms;
- and
- at least one of the annular prisms including a facet at an edge between the inner annular surface and the outer annular surface of the at least one of the annular prisms.
2 more elements
Dependencies are inferred from the claim text.