High-intensity light emitting diode with concave and convex shaped light scattering portions formed on a cover

• US 7,193,365 B2
• Filed: 02/10/2003
• Issued: 03/20/2007
• Est. Priority Date: 02/08/2002
• Status: Active Grant

• Current Assignee: Citizen Electronics Company Limited
• Original Assignee: Citizen Electronics Company Limited
• Inventors: Ishizaka, Mitsunori
• Primary Examiner(s): Roy; Sikha
• Application Number:
  US10/360,922
• Publication Number:
  US 20030151361A1
• Time in Patent Office: 1,499 Days
• Field of Search: 313/512, 313/515, 313501-503, 257 98-103, 362/268, 362/231, 362/256, 362/240
• US Class Current: 313/512
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/32245 the item being metallic
• 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 2224/73265 Layer and wire connectors
• 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 2924/10253 Silicon [Si]
• CPC Class Codes: H01L 2924/12041 LED
• CPC Class Codes: H01L 2924/1815 Shape
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/54 having a particular shape

Abstract

A light emitting diode, capable of accomplishing enlargement of emitted range of light and equalization of brightness of emitted light has a substrate (22), electrodes (23a, 23b), a light emitting element (24) mounted on the substrate (22) and connected electrically with the electrodes (23a, 23b), a resinous cover (26) for sealing the light emitting element (24) and electrodes (23a, 23b) and an uneven shaped light scattering part (30) provided on the surface of the cover.

Claims

1. A high-intensity light emitting diode comprising:

a substrate;

a pair of electrodes provided on said substrate;

a light emitting element mounted on said substrate and connected electrically with said electrodes, the light emitting element having a light-projecting surface;

a transparent cover comprising a cuboid resin formed on said substrate for sealing said electrodes and said light emitting element; and

a concave and convex shaped light scattering part provided on a flat surface of said cover facing toward the light-projecting surface of the light emitting element;

wherein said light scattering part includes a plurality of concave and convex portions formed on the flat surface of the cover,

wherein a depth and an oblique angle of each of the concave and convex portions are un-uniformly formed with respect to each other so that light scatters in a wide-angle direction at the light scattering part,

wherein the depth of each of the concave and convex portions of the light scattering part is 4 μ

m or more, and

wherein the oblique angle made by each of the concave and convex portions of the light scattering part is in a range of 1 to 45 degrees.