Chip type light emitting diode and methodof manufacture thereof

• US 20020030445A1
• Filed: 09/12/2001
• Published: 03/14/2002
• Est. Priority Date: 09/13/2000
• Status: Abandoned Application

• Current Assignee: Citizen Electronics Company Limited
• Original Assignee: Citizen Electronics Company Limited
• Inventors: Fukasawa, Koichi
• Application Number:
  US09/949,725
• Publication Number:
  US 20020030445A1
• Time in Patent Office: Days
• US Class Current: 313/512
• CPC Class Codes: G02B 6/4202 for coupling an active element with fibres without intermediate optical elements, e.g. fibres with plane ends, fibres with shaped ends, bundles
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 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 2924/3025 Electromagnetic shielding
• CPC Class Codes: H01L 33/483 Containers
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H05K 1/182 associated with components mounted in the printed circuit board, e.g. insert mounted components [IMC]

Abstract

A chip type light emitting diode and a method of manufacture thereof are disclosed. The chip type light emitting diode can be mounted together with other electronic components on a mother board in the same process at one time and which is very useful as a light source for a liquid crystal backlight.

The chip type light emitting diode has a base portion mounted to one surface side of the mother board, a body portion extending from the base portion and adapted to pass through a hole in the mother board, and a light emitting portion provided on the body portion to emit light on the other surface side of the mother board. The base portion is provided with a pair of external connection electrodes electrically connected to the light emitting portion. The light emitting portion is sealed with a resin sealant block. In one example, when the base portion is mounted to the back surface side of the mother board, the light emitting portion is so arranged that its light emitting direction matches the light conduction direction of the liquid crystal backlight arranged on the mother board.

The method of manufacturing a chip type light emitting diode performs a plurality of steps to form a plurality of chip type light emitting diodes on a single collective circuit board and a final step of dividing the collective circuit board into individual chip type light emitting diodes.

Claims

1. A chip type light emitting diode comprising:

a base portion;

a body portion extending from said base portion;

a light emitting portion provided on said body portion; and

a resin sealant block for sealing said light emitting portion.

2. The chip type light emitting diode according to claim 1, wherein said base and body portions combine to form a T-shaped structure.

3. The chip type light emitting diode according to claim 1, wherein said base portion is provided with a pair of external connection electrodes electrically connected to said light emitting portion.

4. The chip type light emitting diode according to claim 1, wherein said base portion is mounted on one surface side of a mother board and said body portion passes through a hole formed in the mother board so that the light emitting portion on the body portion is exposed on the other surface side of said mother board.

5. The chip type light emitting diode according to claim 1, wherein said light emitting portion is provided on a side face of said body portion and a light emitting direction of the light emitting portion is virtually aligned with a light conduction direction of a light conductor plate of a liquid crystal backlight arranged on a mother board.

6. The chip type light emitting diode according to claim 1, wherein said resin sealant block is provided with a convex lens portion.

7. The chip type light emitting diode according to claim 1, wherein a reflection surface surrounding a light emitting diode element making up said light emitting portion inclines to expand outwardly.

8. The chip type light emitting diode according to claim 1, wherein a light-shielding surface is formed on a part of an external surface of said resin sealant block.

9. A method of manufacturing a chip type light emitting diode comprising:

a step of forming a number of rectangular holes in a collective circuit board in columns and rows at equal intervals, forming through-holes on inner circumferential surfaces of said rectangular holes, and providing between the plurality of holes a plurality of base portions, body portions vertically extending one from each of said base portions, external connection electrodes formed on said base portions, and first and second electrode portions formed on said body portions;

a step of arranging light emitting portions on said first electrode portions and connecting said light emitting portions and said second electrode portions by bonding wires;

a step of putting on said collective circuit board a mold formed with recesses to accommodate said light emitting portions and bonding wires in such a manner that said recesses match said light emitting portions and said bonding wires and sealing said light emitting portions and said bonding wires by filling a resin into said recesses; and

a step of, after removing said mold, cutting said collective circuit board in column and row directions to form chip type light emitting diodes each comprising said base portion having said external connection electrodes and said body portion having said first and second electrode portions and said light emitting portion.