Low-loss non-imaging optical concentrator for use in infrared remote control systems
AssigneeInFocus Corporation
InventorBrian D. Wichner
Life of this patent
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Abstract
Infrared radiation receivers (40, 72) of this invention include non-imaging optical concentrators (18, 70) having light exit surfaces (52, 86); a light sensor (46) having a light entrance surface that is separated from the light exit surface by a small air gap (53); and a soft, pliable, light transmissive medium (100, 110) inserted in the gap to reduce the light transmission loss across the gap. The soft, pliable medium is held in place by either a recess (116) in the concentrator or by a surrounding annular ring (104).
Claims14
A light radiation receiver apparatus having a low light transmission loss, comprising:
- a radiation transmissive body having a light exit surface and a recess surrounding the light exit surface;
- a light sensor having a light entrance surface that is separated from the light exit surface by a gap;
- and
- a light transmission medium inserted in the gap and into the recess to reduce the light transmission loss across the gap.
A method of making a light radiation receiver having a low light transmission loss, comprising:
- providing a radiation transmissive body having a light exit surface and a recess;
- providing a light sensor having a light entrance surface;
- separating from the light exit surface by a gap;
- and
- inserting a light transmission medium in the gap and into the recess to reduce the light transmission loss across the gap.
Dependencies are inferred from the claim text.