Light emitting diode with direct view optic
View Patent ↗An LED and light guide assembly has an LED with an output surface; a first power input lead electrically coupled to a first pole and having a first surface and a second surface; and a second power input lead electrically coupled to a second pole and having a first surface and a second surface. A unitary, molded light guide has an axially extending, light transmissive body with a light output window. An input window is formed with the unitary, molded light guide being aligned in a zero-gap relationship to capture substantially all the light emitted by the LED. A support is formed integral with the light guide and envelopes a portion of the first surface and the second surface of the first power input lead and the first surface and the second surface of the second power input lead to anchor the guide with respect to the power inputs.
1. A method of making a unitary LED and light guide assembly ( 10 ) comprising the steps of:
forming first and second electrically isolated power input leads ( 16 , 20 );
securing an LED ( 12 ) with an output surface ( 14 ) to one of said first and second electrically isolated power input leads;
electrically connecting said LED to the other of said electrically isolated power input leads to form a subassembly ( 50 );
placing said subassembly ( 50 ) in a mold; and
molding a unitary light guide ( 24 ) about said subassembly ( 50 ) and further including the steps of providing said unitary light guide ( 24 ) with an axially extending, light transmissive guide body ( 26 ) using total internal reflection, said guide body ( 26 ) having a light output window ( 28 ), an input window ( 30 ) formed to capture substantially all the light emitted by the LED ( 12 ) at said output surface ( 14 ); and
molding the unitary light guide ( 24 ) about said subassembly ( 50 ) to provide an integral support ( 32 ) enveloping at least a portion of a first surface ( 16 a ) and a second surface ( 16 b ) of said first power input lead ( 16 ) and a first surface ( 20 a ) and a second surface ( 20 b ) of said second power input (lead 20 ) to anchor said guide body ( 26 ) with respect to the electrically isolated power inputs ( 16 , 20 ) and molding a base coupling ( 38 ) formed to frictionally engage a recess ( 110 ) in a substrate ( 100 ).
2. An LED and light guide assembly ( 10 ) for mounting to a substrate ( 100 ), comprising:
an LED ( 12 ) with an output surface ( 14 );
a first power input lead ( 16 ) electrically coupled to a first pole ( 18 ) of said LED ( 12 ) and having a first surface ( 16 a ) and a second surface ( 16 b );
a second power input lead ( 20 ) electrically coupled to a second pole ( 22 ) of said LED ( 12 ) and having a first surface ( 20 a ) and a second surface ( 20 b ); and
a unitary, molded light guide ( 24 ) comprising;
a light output window ( 28 );
an input window ( 30 ) axially spaced from said output window ( 28 ) and being aligned to capture substantially all the light emitted by the LED ( 12 ) at said output surface ( 14 ); and
an axially extending, light transmissive, light guide body ( 26 ) using total internal reflection and a support ( 32 ) integral with said light guide body ( 26 ), said support ( 32 ) enveloping at least a portion of said first surface ( 16 a ) and said second surface ( 16 b ) of said first power input lead ( 16 ) and said first surface ( 20 a ) and said second surface ( 20 b ) of said second power input lead ( 20 ) to anchor the light guide body ( 26 ) with respect to said power inputs leads ( 16 , 20 ) and wherein said unitary, molded light guide ( 24 ) includes a base coupling ( 38 ) formed to frictionally engage a recess ( 110 ) in said substrate ( 100 ) to form an anchor for the LED assembly ( 10 ).
3. The LED and light guide assembly ( 10 ) of claim 2 wherein said LED ( 12 ) is coupled to said light guide ( 24 ) in a zero loss light-gap relationship.
4. The LED and light guide assembly ( 10 ) of claim 2 wherein said substrate ( 100 ) is a printed circuit board.
5. The LED and light guide assembly ( 10 ) of claim 2 wherein said base coupling ( 38 ) includes a plurality of peripheral barbs ( 38 a ).