Light emitting diode assembly and methods

• US 8,324,642 B2
• Filed: 02/12/2010
• Issued: 12/04/2012
• Est. Priority Date: 02/13/2009
• Status: Active Grant

• Current Assignee: Signify North America Corporation (Signify N.V.)
• Original Assignee: Once Innovations Inc. (Signify N.V.)
• Inventors: Grajcar, Zdenko
• Primary Examiner(s): Lee, Kyoung
• Application Number:
  US12/705,408
• Publication Number:
  US 20100207150A1
• Time in Patent Office: 1,026 Days
• Field of Search: None
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/3011 Impedance
• CPC Class Codes: H01L 33/483 Containers
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 2201/1059 Connections made by press-fit insertion
• CPC Class Codes: H05K 2201/10856 Divided leads, e.g. by slot in length direction of lead, or by branching of the lead
• CPC Class Codes: H05K 3/308 Adaptations of leads connectors to printed circuits H01R12/00

Abstract

Exemplary systems and methods for LED light engines include an LED package with electrical leads, each lead forming a compliant portion for making electrical and mechanical connection upon insertion into a receptacle of a circuit substrate. In an illustrative example, the electrical and mechanical connections may be formed upon the insertion of the compliant portion into the receptacle and without further process steps involving solder. Various examples may further include an elongated thermal dissipation member extending from a bottom of a package that contains the LED, where the elongated thermal member (e.g., tab) may be in substantial thermal communication with the LED die. As an example, the tab may provide a substantially reduced thermal impedance for dissipating heat from the LED die. Upon insertion into a circuit substrate, the LED package may be releasable by mechanical extraction without applied heat to facilitate repair or replacement, for example.

Claims

1. A module capable of removable assembly of a light emitting diode (LED) to a circuit substrate, the module comprising:

a housing with a lens and a body member that define an interior cavity;

an LED die disposed within the interior cavity of the housing and directed to emit light through the lens in response to electrical excitation;

at least one compliant pin attached to the housing, wherein each of the at least one compliant pins comprises;

(i) an insertion portion adapted to collapse radially upon insertion into a receptacle of a circuit substrate; and

(ii) a body portion extending from the insertion portion to the housing; and

an electrical connection between a terminal of the LED die and the body portion of at least one of the compliant pins,

wherein the electrical connection provides a low impedance electrical path from one of an anode and a cathode of the LED die to the body portion.

2. The module of claim 1, wherein the insertion portion provides a radial bias against the receptacle so as provide a retention force to substantially resist extraction forces below a threshold extraction force.

3. The module of claim 1, wherein the insertion section comprises an aperture.

4. The module of claim 3, wherein the aperture defines a volume to permit said collapse upon insertion into the receptacle of the circuit substrate.

5. The module of claim 1, wherein the insertion portion has an outer diameter that is greater than an inner diameter of the receptacle when the insertion portion is outside of the receptacle and in a relaxed state.

6. The module of claim 1, further comprising an elongated heat dissipation member attached to the body member and in substantial thermal communication with the LED die.

7. The module of claim 1, wherein the number of compliant pins is at least two.

8. The module of claim 1, wherein the number of compliant pins is at least four.

9. A module capable of removable assembly of a light emitting diode (LED) to a circuit substrate, the module comprising:

a housing with a lens and a body member that define an interior cavity;

an LED die disposed within the interior cavity of the housing and directed to emit light through the lens in response to electrical excitation;

at least one compliant pin attached to the housing, wherein each of the at least one compliant pins comprises;

(i) an insertion portion adapted to collapse radially upon insertion into a receptacle of a circuit substrate; and

(ii) a body portion extending from the insertion portion to the housing;

an elongated heat dissipation member attached to the body member and in substantial thermal communication with the LED die; and

a low impedance conductive path between the heat dissipation member and an electrical node at a reference potential.

10. A light emitting diode (LED) light engine, comprising:

a circuit substrate with at least one receptacle;

a housing with a lens and a body member that define an interior cavity;

an LED die disposed within the interior cavity of the housing and directed to emit light through the lens in response to electrical excitation; and

,

at least one compliant pin attached to the housing, wherein each of the at least one compliant pins comprises;

(i) an insertion portion adapted to collapse radially upon insertion into one of the at least one receptacle of the circuit substrate; and

(ii) a body portion extending from the insertion portion to the housing; and

an electrical connection between a terminal of the LED die and the body portion of at least one of the compliant pins,

wherein the electrical connection provides a low impedance electrical path from one of an anode and a cathode of the LED die to the body portion.

11. The LED light engine of claim 10, wherein the insertion portion provides a radial bias against the receptacle so as provide a retention force to substantially resist extraction forces below a threshold extraction force.

12. The LED light engine of claim 10, wherein the insertion section comprises an aperture.

13. A light emitting diode (LED) light engine, comprising:

a circuit substrate with at least one receptacle;

a housing with a lens and a body member that define an interior cavity;

an LED die disposed within the interior cavity of the housing and directed to emit light through the lens in response to electrical excitation;

at least one compliant pin attached to the housing, wherein each of the at least one compliant pins comprises;

(i) an insertion portion adapted to collapse radially upon insertion into any one of the at least one receptacle of the circuit substrate; and

(ii) a body portion extending from the insertion portion to the housing;

an elongated heat dissipation member attached to the body member and in substantial thermal communication with the LED die; and

a low impedance conductive path between the heat dissipation member and an electrical node at a reference potential.