Light emitting diode lamp

• US 5,931,570 A
• Filed: 05/16/1997
• Issued: 08/03/1999
• Est. Priority Date: 05/20/1996
• Status: Expired due to Term

• Current Assignee: Toshiyo Yamuro
• Original Assignee: Hiyoshi Electric Co., Ltd.
• Inventors: Yamuro, Yukio
• Primary Examiner(s): CARIASO, ALAN B
• Application Number:
  US08/857,441
• Time in Patent Office: 809 Days
• Field of Search: 313/500, 313/511, 313/512, 313/116, 362/244, 362/246, 362/249, 362/310, 362/311, 362/800, 362/255, 362/355, 359/615
• US Class Current: 362/355
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• 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 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• 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 33/54 having a particular shape
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An LED lamp according to the present invention emits light approximately in all directions like a small filament lamp. The LED lamp is a light emitting bulb-shaped unit, and comprises an epoxy resin bulb-shaped portion; two leads of which one end is extended outside the bulb-shaped portion and the other end is embedded in the bulb-shaped portion; and an LED chip connected to the ends of the two leads and embedded in the bulb-shaped portion. The surface of the bulb-shaped portion of the LED lamp is formed in an appropriate process to be a frosted glass surface, a cut-diamond surface, a surface covered with small particles, or an optically-diffusing cap. Thus, a durable, non-fragile, and small power-consuming LED lamp can be obtained.

Claims

1. A light-emitting-diode lamp comprising:

a resin body having a generally cylindrical form, with a convex hemispherical top, and an external surface formed as a frosted surface, and a base portion opposite the top; and

a light source in the base portion of said resin body, wherein;

said light source comprises a light-emitting-diode chip directed to emit light mainly towards said hemispherical top; and

said external frosted surface of said resin body is adapted so that uniformly diffused light is emitted by the lamp in all directions except backward through said base.