Light emitting diode lamp

• US 5,575,459 A
• Filed: 04/27/1995
• Issued: 11/19/1996
• Est. Priority Date: 04/27/1995
• Status: Expired due to Fees

• Current Assignee: Uniglo Canada Incorporated
• Original Assignee: Uniglo Canada Incorporated
• Inventors: Anderson, Robert A.
• Primary Examiner(s): Gromada, Denise
• Assistant Examiner(s): Cariaso, Alan B.
• Application Number:
  US08/429,552
• Time in Patent Office: 572 Days
• Field of Search: 439/339, 439/605, 439/611, 439/615, 313/318.03, 313/318.09, 313/500, 313/501, 313/512, 315/185 R, 315/185 S, 315/192, 315/291, 315/294, 315/324, 362/226, 362/232, 362/240, 362/249, 362/250, 362/363, 362/800
• US Class Current: 362/240
• 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: F21K 9/65 specially adapted for changing the characteristics or the distribution of the light, e.g. by adjustment of parts
• CPC Class Codes: F21V 14/02 by movement of light sources in vehicle head lamps F21S41/657
• CPC Class Codes: F21V 19/02 with provision for adjustment, e.g. for focusing
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/395 Linear regulators
• CPC Class Codes: H05B 45/50 responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A light emitting diode array mounted on a printed circuit board is provided with capacitive means to reduce voltage, mounted in a glass tube and provided with a standard candelabra or other base for insertion into a light socket in a slim line exit or other sign. In a preferred embodiment the circuit board is rotatable relative to the metal base so as to facilitate maximum light emission from the sign.

Claims

1. A light emitting diode lamp assembly comprising:

a first plurality of light emitting diodes connected in series with each other and in parallel with a second plurality of light emitting diodes with opposite polarity connected in series so that each of said light emitting diodes generate light when properly forwardly biased and including capacitive means to reduce voltage drop across said light emitting diodes;

a rigid base means having said light emitting diodes mounted thereon;

metal base means to connect said light emitting diodes to an AC power source;

a light transmissive cover means adapted to receive and contain said rigid base means and said light emitting diodes mounted thereon; and

insulating means intermediate said cover means and said metal base means, adapted to be received in said metal base means and to receive said cover means, so that said cover means and said rigid base means may be rotated relative to said metal base means when in operative connection with said AC power source, and wherein said insulating means comprises a first cap portion adapted to receive said cover means and including a central bore, a second cap portion including a hollow boss adapted to be slidingly inserted through said central bore and an axially aligned flange portion for rotatable planar engagement with said first cap portion, and means to secure said boss to said metal base means.

2. A light emitting diode lamp assembly as claimed in claim 1 wherein said metal base means comprises a screw threaded candelabra base.

3. A light emitting diode lamp assembly as claimed in claim 1 wherein said light transmissive cover means comprises a glass tube closed at a distal end thereof.

4. A light emitting diode lamp assembly as claimed in claim 3 wherein said glass tube comprises a frosted glass tube.