Coin shaped light-emitting device and coin shaped spotlight comprising same

• US 7,559,669 B2
• Filed: 01/05/2007
• Issued: 07/14/2009
• Est. Priority Date: 08/25/2006
• Status: Expired due to Fees

• Current Assignee: Lin Yuan
• Original Assignee: Lin Yuan
• Inventors: Lin, Yuan
• Primary Examiner(s): Vu; David Hung
• Assistant Examiner(s): Le; Tung X
• Application Number:
  US11/649,895
• Publication Number:
  US 20080048566A1
• Time in Patent Office: 921 Days
• Field of Search: 315/200.A, 315/210, 315/224, 315/291, 262/202, 262/208, 262/227, 262/800, 262/804
• US Class Current: 362/202
• CPC Class Codes: F21S 2/00 Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
• CPC Class Codes: F21S 8/02 of recess-mounted type, e.g. downlighters specially adapted for vehicle exteriors F21S41/00-F21S45/00
• CPC Class Codes: F21V 23/00 Arrangement of electric circuit elements in or on lighting devices characterised by cooling arrangements F21V29/508
• CPC Class Codes: F21V 31/005 Sealing arrangements therefor
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48137 the bodies being arranged next to each other, e.g. on a common substrate
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/40 Details of LED load circuits
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A coin shaped light-emitting device is disclosed and includes a light-emitting member formed by encapsulating and wiring a plurality of LEDs on a thin substrate, a constant current controller for operating the light-emitting member in constant current and causing the light-emitting member to emit bright light, and a shell for enclosing the light. A water-resistant arrangement is further incorporated into the light-emitting device. A coin shaped spotlight is further disclosed and is formed by connecting a plurality of light-emitting devices in series, in parallel, or in another configuration. The spotlight has advantages of increased reliability, energy saving, and prolonged useful life.

Claims

1. A coin shaped light (1) comprising:

a light-emitting member (11) comprising a plurality of LEDs (113) and a lens (14) formed together by encapsulation;

a constant current controller (12) electrically connected to the light-emitting member (11) for supplying a constant current;

an electrical connector (13) electrically connected the constant current controller (12) and the light-emitting member (11) to a source of power; and

a hollow cylinder (23) for fastening the light-emitting member (11), the constant controller (12), and the connector (13) together as a coin shaped light unit.

2. The light (1) of claim 1, wherein the light-emitting member (11) further comprises a substrate (111) and a LED array (110) together with the lens (14) formed on a surface of the substrate (111) by encapsulation.

3. The light (1) of claim 2, wherein the LED array (110) are formed by electrically connecting the plurality of LEDs (113) together by encapsulation and wiring.

4. The light (1) of claim 1, wherein the constant current controller (12) comprises parallel first and second constant current control circuits (121;

122), each of the first and second constant current control circuits (121;

122) comprising;

an operational amplifier (123 or 123′

);

a reference voltage source (124 or 124′

) electrically connected to a first resistor (125 or 125′

) which is in turn electrically connected to a positive terminal of the source of power so as to apply a reference voltage to a negative terminal of the operational amplifier (123 or 123′

) via the first resistor (125 or 125′

) and the reference voltage source (124 or 124′

);

a sampling resistor (126 or 126′

) interconnected a negative terminal of the source of power and a positive terminal of the operational amplifier (123 or 123′

) so as to apply a sampling voltage to the positive terminal of the operational amplifier (123 or 123′

) via the sampling resistor (126 or 126′

); and

a switch (127 or 127′

) adapted to conduct or cut off an output of either the first constant current control circuit (121) or the second constant current control circuit (122) based on a comparison result of the reference voltage and the sampling voltage.

5. The light (1) of claim 1, wherein the connector (13) comprises two conductors (132) electrically connected the constant current controller (12) and a plurality of pairs of terminals (131), each pair of terminals (131) adapted to electrically connect to the source of power.

6. A coin shaped spotlight including a plurality of light-emitting devices each comprising:

a light (1) comprising;

a light-emitting member (11) comprising a plurality of LEDs (113) and a lens (14) formed together by encapsulation;

a constant current controller (12) electrically connected to the light-emitting member (11) for suplying a constant current; and

an electrical connector (13) electrically connected the constant current controller (12) and the light-emitting member (11) to a source of power; and

a shell (2) comprising;

a hollow cylindrical case (21);

a cover (22) releasable secured to one end of the case (21) and comprising a central through hole (221);

a hollow cylinder (23) mounted within the case (21) for fastening the light-emitting member (11), the constant current controller (12), and the connector (13) together; and

a fastener (24) threadedly secured to the other end of the case (21) and comprising a hollow internal water-resistant member (243) with wires (251) passed through the water-resistant member (243) and the case (21).

7. The spotlight of claim 6, wherein the light-emitting member (11) further comprises a substrate (111) and a LED array (110) together with the lens (14) formed on a surface of the substrate (111) by encapsulation, and wherein the substrate (111) comprises a plurality of fasteners (15) driven into the cylinder (23) for securing the substrate (111) to the cylinder (23).

8. The spotlight of claim 6, wherein the constant current controller (12) comprises parallel first and second constant current control circuits (121;

122), each of the first and second constant current control circuits (121;

122) comprising;

an operational amplifier (123 or 123′

);

a reference voltage source (124 or 124′

) electrically connected to a first resistor (125 or 125′

) which is in turn electrically connected to a positive terminal of the source of power so as to apply a reference voltage to a negative terminal of the operational amplifier (123 or 123′

) via the first resistor (125 or 125′

) and the reference voltage source (124 or 124′

);

a sampling resistor (126 or 126′

) interconnected a negative terminal of the source of power and a positive terminal of the operational amplifier (123 or 123′

) so as to apply a sampling voltage to the positive terminal of the operational amplifier (123 or 123′

) via the sampling resistor (126 or 126′

); and

a switch (127 or 127′

) adapted to conduct or cut off an output of either the first constant current control circuit (121) or the second constant current control circuit (122) based on a comparison result of the reference voltage and the sampling voltage.

9. The spotlight of claim 6, wherein the connector (13) comprises two conductors (132) electrically connected the constant current controller (12) and a plurality of pairs of terminals (131), each pair of terminals (131) adapted to electrically connect to the source of power.

10. The spotlight of claim 6, wherein the cover (22) further comprises a lens (222) configured and dimensioned to mount in the through hole (221).

11. The spotlight of claim 6, wherein the cylinder (23) comprises a body (231), a positioning member (233) of curved section extended downward from the body (231) and comprising a plurality of threaded holes (235) on one end for fastening the light-emitting member (11) thereon by the fasteners (15), and a pin (234) inserted through the positioning member (233) to fasten the positioning member (233) and the connector (13) together.

12. The spotlight of claim 6, wherein the wires (251) are electrically connected to the connector (13), and wherein the fastener (24) further comprises:

a hollow first portion (241) comprising an externally threaded first element (244) at one end, an externally threaded second element (245) at the other end, and a knurled extension (246) projected from the second element (245); and

a hollow second portion (242) having inner threads secured to the second element (245) for fastening the knurled extension (246) in the water-resistant member (243).

13. A coin shaped light (1) comprising:

a light-emitting member (11) comprising a plurality of LEDs (113) and a lens (14) formed together by encapsulation;

a constant current controller (12) electrically connected to the light-emitting member (11) for supplying a constant current; and

an electrical connector (13) electrically connected the constant current controller (12) and the light-emitting member (11) to a source of power,

wherein the constant current controller (12) comprises parallel first and second constant current control circuits (121;

122), each of the first and second constant current control circuits (121;

122) comprising;

an operational amplifier (123 or 123′

);

a reference voltage source (124 or 124′

) electrically connected to a first resistor (125 or 125′

) which is in turn electrically connected to a positive terminal of the source of power so as to apply a reference voltage to a negative terminal of the operational amplifier (123 or 123′

) via the first resistor (125 or 125′

) and the reference voltage source (124 or 124′

);

a sampling resistor (126 or 126′

) interconnected a negative terminal of the source of power and a positive terminal of the operational amplifier (123 or 123′

) so as to apply a sampling voltage to the positive terminal of the operational amplifier (123 or 123′

) via the sampling resistor (126 or 126′

); and

a switch (127 or 127′

) adapted to conduct or cut off an output of either the first constant current control circuit (121) or the second constant current control circuit (122) based on a comparison result of the reference voltage and the sampling voltage.