LED lamp

• US 5,289,082 A
• Filed: 09/06/1991
• Issued: 02/22/1994
• Est. Priority Date: 09/07/1990
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Komoto, Satoshi
• Primary Examiner(s): O SHEA, SANDRA L
• Application Number:
  US07/755,841
• Time in Patent Office: 900 Days
• Field of Search: 313/500, 313/512, 362/800
• US Class Current: 313/500
• CPC Class Codes: G02B 3/04 with continuous faces that are rotationally symmetrical but deviate from a true sphere , e.g. so called "aspheric" lenses
• 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 2224/48465 the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• 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 33/54 having a particular shape
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A LED lamp having a lead, a plurality of semiconductor chips placed on a tip portion of the lead, a translucent envelope surrounding the semiconductor chips, characterized in that the envelope is formed of a solid body containing parts of a plurality of ellipsoids or spheres whose axes extend through the semiconductor chips, respectively.

Claims

1. An LED lamp including a lead having a tip portion on which first and second semiconductor chips are mounted, and an envelope surrounding the chips;

wherein

the envelope has upper and lower portions;

the lower portion is cylindrical in shape and has an axis extending through the lead; and

the upper portion is formed of part of a first ellipsoid which has an axis extending through the first semiconductor chip and being parallel with the lead, the first ellipsoid including points which are at different distances from a center of the first ellipsoid, and part of a second ellipsoid which has an axis extending through the second semiconductor chip and being parallel with the lead, the second ellipsoid including points which are at different distances from a center of the second ellipsoid.

2. The LED lamp according to claim 1, wherein the axes of the first ellipsoid and the second ellipsoid are parallel with each other.

3. An LED lamp including a lead having a tip portion of which a plurality of semiconductor chips are mounted, and an envelope surrounding the chips:

wherein

the envelope has upper and lower portions;

the lower portion is cylindrical in shape and has an axis extending through the lead; and

the upper portion is formed of portions of ellipsoids except spheroids, each ellipsoid has an axis extending through one of the semiconductor chips and each of said axes of said ellipsoids being parallel to the lead.

4. A light emitting diode, comprising:

an envelope having an upper and a lower portion;

a plurality of light emitting means contained within said envelope; and

supply means, extending through the lower portion of said envelope, for supplying energy to the plurality of light emitting means;

said upper portion of said envelope comprising portions of ellipsoids corresponding to said plurality of light emitting means such that there is a portion of a different ellipsoid corresponding to each of said light emitting means, each of said ellipsoids including points which are at a different distance from a center of one of said ellipsoids corresponding to the points.

5. A light emitting diode according to claim 4, wherein each of said ellipsoids contains an axis extending through the corresponding light emitting means and said axes are parallel to each other.