Lens member and optical unit using said lens member
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United States of America Patent
Stats
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Oct 7, 2014
Grant Date -
Mar 29, 2012
app pub date -
Sep 22, 2011
filing date -
Sep 29, 2010
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A lens member includes a central axis, a light-incident side including a Fresnel-lens surface provided with a plurality of annular prisms concentrically arranged with respect to the central axis, and a light-exit surface opposite to the light-incident side. The Fresnel-lens surface further includes an annular lens portion that is concentrically arranged with respect to the central axis and that is extended to be longer and wider than the plurality of annular prisms. Provided is an optical unit in which a light source and a lens member are combined, and parts are disposed in a space provided in an outer periphery of the annular lens portion.
First Claim
Family
International Classification(s)
- F21V:FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES....
- F21Y:INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21L,....
- F21K:LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21L:LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABL....
- G02B:OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
- F21S:NON-PORTABLE LIGHTING DEVICES OR SYSTEMS THEREOF
- [Classification Symbol]
- [Patents Count]
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