USRE42179E1 - Light emitting diode package with coaxial leads - Google Patents

Light emitting diode package with coaxial leads Download PDF

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Publication number
USRE42179E1
USRE42179E1 US11/902,931 US90293107A USRE42179E US RE42179 E1 USRE42179 E1 US RE42179E1 US 90293107 A US90293107 A US 90293107A US RE42179 E USRE42179 E US RE42179E
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United States
Prior art keywords
led
electrode
lead
outer lead
leads
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Expired - Lifetime, expires
Application number
US11/902,931
Inventor
Jiahn-Chang Wu
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Cheng Kung Capital LLC
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Individual
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Priority to US11/902,931 priority Critical patent/USRE42179E1/en
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Assigned to CHENG KUNG CAPITAL, LLC reassignment CHENG KUNG CAPITAL, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WU, JIAHN-CHANG
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/857—Interconnections, e.g. lead-frames, bond wires or solder balls
    • H10W90/756—

Definitions

  • This invention relates to light emitting device, particularly to the package of light emitting device (LED) or laser diode (LD).
  • LED light emitting device
  • LD laser diode
  • FIG. 1 shows a prior art package for a LED.
  • a LED 10 chip is mounted in a recess at the top of lead 11 of the LED package, which is in contact with the bottom electrode of the LED 10 .
  • the top electrode of the LED 10 is wire bonded to a second lead 12 of the package with a metal wire 14 .
  • the top portions of the leads 11 , 12 are imbedded in protective glue 13 .
  • the board When such a package is mounted on a planar display board, the board usually has printed wiring on the underside.
  • the LED leads can only reach the printed wiring through plated through holes.
  • a new printed wiring board When a customer changes the display panel pattern, a new printed wiring board must be furnished. Therefore, such a LED package lacks design flexibility for a display.
  • An object of this invention is to provide a LED package design flexibility in mounting on a display panel. Another object of this invention is to provide a LED package which can easily be removed and inserted into a mother board. Still another object of this invention is to save space between the LED leads.
  • the coaxial leads are separated from each other by an insulating sleeve.
  • the LED can be mounted on top of the inner lead, or mounted on the side of the a protruded inner leads to change the direction of light emission.
  • the two bottom electrodes can straddle over the planar tops of the two coaxial leads, or straddles over the two coaxial leads along their telescopic sides.
  • FIG. 1 shows a prior art LED package.
  • FIG. 2 shows a first embodiment of the present invention for a LED package with two coaxial leads.
  • FIG. 3 shows a second embodiment of the present invention with coaxial leads and side-mount LED.
  • FIG. 4 shows a third embodiment of the present invention with coaxial leads for LED with two bottom electrodes.
  • FIG. 5 shows a fourth embodiment of the present invention with coaxial leads for side-mount LED with two bottom electrodes.
  • FIG. 2 shows the basic structure of the LED package based on the present invention.
  • the package has two concentric leads: an inner leads 21 and outer lead 22 .
  • the two concentric leads 21 , 22 are separated by an insulating sleeve 23 . Both the top surfaces of the two leads 21 and 22 are made planar.
  • the LED chip 20 with a bottom electrode and a top electrode is mounted on top of the inner lead 21 .
  • the top electrode of the LED 20 is wire bonded to the outer lead 22 through a wire 24 .
  • the dotted lines show how the LED package of the present invention is inserted into a display panel board.
  • the bottom layer 271 of this dotted structure is a soft conducting layer, which supplies the first power source.
  • the top layer 272 of this dotted structure is a soft conducting layer, which supplies the second power source.
  • a soft insulating layer 273 In between the bottom soft layer 271 and top soft layer 272 is a soft insulating layer 273 .
  • the soft conducting layer refers to conducting sponge, conducting rubber or metallic mesh.
  • the soft insulating layer refers to glue, sponge, etc.
  • the leads 21 , 22 are selected from metal which can withstand repeated insertions.
  • FIG. 3 shows a second embodiment of the present invention.
  • the structure is similar to that in FIG. 2 , except that the LED 20 is mounted on the side of a protruded inner lead 21 .
  • the light emitted from the LED 20 is orthogonal to that emitted from that in FIG. 2 .
  • Other reference numerals refer to the corresponding parts in FIG. 2 .
  • FIG. 4 shows a third embodiment of the present invention. This structure is applicable to a LED 202 with two bottom electrodes with solder 281 , 282 . Both the top surfaces of the two leads 21 and 22 are made planar. These two electrodes straddle over the top of the inner leads 21 and the top of the outer lead 22 to make contacts. Other parts with the same reference numerals as that shown in FIG. 2 perform the same corresponding functions.
  • FIG. 5 shows a fourth embodiment of the present invention.
  • This application is applicable to a LED 202 with two bottom electrodes with solder 281 , 282 , but light emission orthogonal to that in FIG. 4 .
  • the coaxial leads has a telescopic inner lead 21 protruding over the inner lead 22 .
  • the LED 202 has soldered electrodes 281 , 282 straddling over the inner coaxial lead 21 and the outer coaxial lead 22 . Because the insulating layer 23 plus the outer lead 22 is made very thin with a thickness d, the soldered leads 281 , 282 of the LED 202 are aligned along the vertical surfaces of the coaxial leads.
  • Other parts with the same reference numerals as that in FIG. 2 perform the same corresponding functions.

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  • Led Device Packages (AREA)

Abstract

The leads of a light emitting diode are made coaxial. The inner lead protrudes lower than the outer lead. The package is inserted into a spongy display panel for power supply. The display panel has three layers: a lower conducting layer for contacting said inner lead and a top conducting layer for contacting said outer layer, and an insulating layer between the top and the bottom layer. For LED with a bottom electrode and a top electrode, the LED can be mounted on the planar tops of the inner lead and the top electrode wire bonded to the outer lead, or the LED can be mounted on the side surface of the inner lead and the top electrode wire bonded to the outer lead. For LED with two bottom electrode, the LED electrodes can straddle over the planar tops of the inner lead and the outer lead, or the LED electrodes can straddle over the telescopic side surfaces of the two leads.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to light emitting device, particularly to the package of light emitting device (LED) or laser diode (LD).
2. Brief Description of Related Art
FIG. 1 shows a prior art package for a LED. A LED 10 chip is mounted in a recess at the top of lead 11 of the LED package, which is in contact with the bottom electrode of the LED 10. The top electrode of the LED 10 is wire bonded to a second lead 12 of the package with a metal wire 14. The top portions of the leads 11, 12 are imbedded in protective glue 13.
When such a package is mounted on a planar display board, the board usually has printed wiring on the underside. The LED leads can only reach the printed wiring through plated through holes. When a customer changes the display panel pattern, a new printed wiring board must be furnished. Therefore, such a LED package lacks design flexibility for a display.
SUMMARY OF THE INVENTION
An object of this invention is to provide a LED package design flexibility in mounting on a display panel. Another object of this invention is to provide a LED package which can easily be removed and inserted into a mother board. Still another object of this invention is to save space between the LED leads.
These objects are achieved by providing the LEDs with coaxial leads. The coaxial leads are separated from each other by an insulating sleeve. For a LED with a bottom electrode, the LED can be mounted on top of the inner lead, or mounted on the side of the a protruded inner leads to change the direction of light emission. For a LED with two bottom electrodes, the two bottom electrodes can straddle over the planar tops of the two coaxial leads, or straddles over the two coaxial leads along their telescopic sides.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a prior art LED package.
FIG. 2 shows a first embodiment of the present invention for a LED package with two coaxial leads.
FIG. 3 shows a second embodiment of the present invention with coaxial leads and side-mount LED.
FIG. 4 shows a third embodiment of the present invention with coaxial leads for LED with two bottom electrodes.
FIG. 5 shows a fourth embodiment of the present invention with coaxial leads for side-mount LED with two bottom electrodes.
 DETAILED DESCRIPTION THE INVENTION
FIG. 2 shows the basic structure of the LED package based on the present invention. The package has two concentric leads: an inner leads 21 and outer lead 22. The two concentric leads 21, 22 are separated by an insulating sleeve 23. Both the top surfaces of the two leads 21 and 22 are made planar. The LED chip 20 with a bottom electrode and a top electrode is mounted on top of the inner lead 21. The top electrode of the LED 20 is wire bonded to the outer lead 22 through a wire 24.
The dotted lines show how the LED package of the present invention is inserted into a display panel board. The bottom layer 271 of this dotted structure is a soft conducting layer, which supplies the first power source. The top layer 272 of this dotted structure is a soft conducting layer, which supplies the second power source. In between the bottom soft layer 271 and top soft layer 272 is a soft insulating layer 273. When the LED package is inserted into the display panel board, the inner lead 21 makes contact with the bottom layer 271 and the outer lead 22 makes contact with top layer 272. Thus, the LED 20 is energized. The soft conducting layer refers to conducting sponge, conducting rubber or metallic mesh. The soft insulating layer refers to glue, sponge, etc. The leads 21, 22 are selected from metal which can withstand repeated insertions.
FIG. 3 shows a second embodiment of the present invention. The structure is similar to that in FIG. 2, except that the LED 20 is mounted on the side of a protruded inner lead 21. In this structure, the light emitted from the LED 20 is orthogonal to that emitted from that in FIG. 2. Other reference numerals refer to the corresponding parts in FIG. 2.
FIG. 4 shows a third embodiment of the present invention. This structure is applicable to a LED 202 with two bottom electrodes with solder 281, 282. Both the top surfaces of the two leads 21 and 22 are made planar. These two electrodes straddle over the top of the inner leads 21 and the top of the outer lead 22 to make contacts. Other parts with the same reference numerals as that shown in FIG. 2 perform the same corresponding functions.
FIG. 5 shows a fourth embodiment of the present invention. This application is applicable to a LED 202 with two bottom electrodes with solder 281, 282, but light emission orthogonal to that in FIG. 4. The coaxial leads has a telescopic inner lead 21 protruding over the inner lead 22. The LED 202 has soldered electrodes 281, 282 straddling over the inner coaxial lead 21 and the outer coaxial lead 22. Because the insulating layer 23 plus the outer lead 22 is made very thin with a thickness d, the soldered leads 281, 282 of the LED 202 are aligned along the vertical surfaces of the coaxial leads. Other parts with the same reference numerals as that in FIG. 2 perform the same corresponding functions.
While the preferred embodiments has been described, it will be apparent to those skilled in the art that various modification may be made in the embodiments without departing from the spirit of the present invention. Such modifications are all within the scope of the present invention.

Claims (5)

1. A light emitting diode (LED) package, comprising:
a light emitting diode having a top electrode and a bottom electrode,
two coaxial leads having an outer lead and an inner lead protruding below said outer lead, and
an insulating layer separating said two coaxial leads,
wherein the top of inner lead and the top of the outer lead are coplanar, and wherein said LED is mounted on said top of the inner lead and the top electrode of the LED is wire bonded to said outer lead.
2. A light emitting diode (LED) package, comprising:
a light emitting diode having a first electrode and a second electrode;
two coaxial leads having an outer lead connected to said first electrode and an inner leads connected to said second electrode and protruding below said outer lead;
an insulating layer separating said two coaxial leads; and
a display panel having a soft conducting top layer for contacting said outer lead to a first power source, a soft conducting bottom layer for contacting said inner lead to a second power source, and an insulating layer separating said top layer and said bottom layer.
3. A light emitting diode (LED) package comprising:
a light emitting diode having a first electrode and a second electrode;
two coaxial leads having an outer lead connected to said first electrode, and an inner lead connected to said second electrode and protruding below said outer lead; and
an insulating layer separating said two coaxial leads,
wherein said LED has two soldered bottom electrodes.
4. The LED package as described in claim 3, wherein the top of said inner lead and the top of said outer lead are coplanar, and the two soldered bottom electrodes straddle over said top of inner lead and said top of said outer lead.
5. The LED package as described in claim 3, A light emitting diode (LED) package comprising:
a light emitting diode having a first electrode and a second electrode;
two coaxial leads having an outer lead connected to said first electrode, and an inner lead connected to said second electrode and protruding below said outer lead; and
an insulating layer separating said two coaxial leads,
wherein said LED has two soldered bottom electrodes; and
wherein said inner lead protrudes over the top of said outer lead, and the two soldered bottom electrodes straddle over the side surfaces of said outer lead and said inner lead.
US11/902,931 2005-07-06 2007-09-26 Light emitting diode package with coaxial leads Expired - Lifetime USRE42179E1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/902,931 USRE42179E1 (en) 2005-07-06 2007-09-26 Light emitting diode package with coaxial leads

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
TW094122775A TWI287882B (en) 2005-07-06 2005-07-06 Light emitting device package with single coaxial lead
TW94122775 2005-07-06
US11/183,076 US7205579B2 (en) 2005-07-06 2005-07-18 Light emitting diode package with coaxial leads
US11/902,931 USRE42179E1 (en) 2005-07-06 2007-09-26 Light emitting diode package with coaxial leads

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US11/183,076 Reissue US7205579B2 (en) 2005-07-06 2005-07-18 Light emitting diode package with coaxial leads

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USRE42179E1 true USRE42179E1 (en) 2011-03-01

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US11/728,610 Expired - Lifetime US7276741B2 (en) 2005-07-06 2007-03-27 Light emitting diode package with coaxial leads
US11/902,931 Expired - Lifetime USRE42179E1 (en) 2005-07-06 2007-09-26 Light emitting diode package with coaxial leads

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US11/728,610 Expired - Lifetime US7276741B2 (en) 2005-07-06 2007-03-27 Light emitting diode package with coaxial leads

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070096132A1 (en) * 2005-11-01 2007-05-03 Jiahn-Chang Wu Coaxial LED lighting board
US8044412B2 (en) 2006-01-20 2011-10-25 Taiwan Semiconductor Manufacturing Company, Ltd Package for a light emitting element
GB2497702B (en) * 2009-08-20 2014-02-12 Graviton Lite Ltd Mounting for light emitting diode
CA2856519C (en) * 2011-11-22 2020-11-03 Ascension Technology Corporation Tracking a guidewire
US9153518B2 (en) * 2013-08-30 2015-10-06 Infineon Technologies Ag Molded semiconductor package with pluggable lead
DE102018131386A1 (en) * 2018-12-07 2020-06-10 Osram Opto Semiconductors Gmbh METHOD FOR PRODUCING OPTOELECTRONIC SEMICONDUCTOR COMPONENTS AND OPTOELECTRONIC SEMICONDUCTOR COMPONENT
CN110542954A (en) * 2019-08-26 2019-12-06 苏州苏驼通信科技股份有限公司 Laser emission device and coaxial TO encapsulation thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4394679A (en) 1980-09-15 1983-07-19 Rca Corporation Light emitting device with a continuous layer of copper covering the entire header
US6492725B1 (en) * 2000-02-04 2002-12-10 Lumileds Lighting, U.S., Llc Concentrically leaded power semiconductor device package
US20070091620A1 (en) 2005-07-14 2007-04-26 Matheson George E Power board and plug-in lighting module

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6281524B1 (en) * 1997-02-21 2001-08-28 Kabushiki Kaisha Toshiba Semiconductor light-emitting device
JP4550386B2 (en) * 2003-03-27 2010-09-22 三菱電機株式会社 Package for optical semiconductor devices
JP2006019455A (en) * 2004-06-30 2006-01-19 Nec Electronics Corp Semiconductor device and manufacturing method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4394679A (en) 1980-09-15 1983-07-19 Rca Corporation Light emitting device with a continuous layer of copper covering the entire header
US6492725B1 (en) * 2000-02-04 2002-12-10 Lumileds Lighting, U.S., Llc Concentrically leaded power semiconductor device package
US20070091620A1 (en) 2005-07-14 2007-04-26 Matheson George E Power board and plug-in lighting module

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TW200703682A (en) 2007-01-16
US7205579B2 (en) 2007-04-17
US20070012942A1 (en) 2007-01-18
TWI287882B (en) 2007-10-01
US7276741B2 (en) 2007-10-02
US20070170456A1 (en) 2007-07-26

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