Light emitting diode assembly for an illuminated sign

• US 20040196636A1
• Filed: 08/27/2003
• Published: 10/07/2004
• Est. Priority Date: 04/03/2003
• Status: Active Grant

• Current Assignee: ATTO Display Company Limited
• Original Assignee: Atto Co., Ltd.
• Inventors: Kim, Sun-Tai
• Granted Patent: US 6,924,973 B2
• Time in Patent Office: Days
• US Class Current: 361/736
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21S 4/10 with light sources attached to loose electric cables, e.g. Christmas tree lights
• CPC Class Codes: F21V 23/02 the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
• CPC Class Codes: F21V 27/02 Cable inlets
• CPC Class Codes: F21V 31/04 Provision of filling media
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G09F 13/0404 the light source being enclosed in a box forming the character of the sign
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: H05K 5/0017 with operator interface units
• CPC Class Codes: H05K 5/064 sealed by potting, e.g. waterproof resin poured in a rigid casing

Abstract

The light emitting diode assembly for an illuminated sign discloses an enhanced waterproofs function and an enhanced durability. The light emitting diode assembly includes a case being open upwards, in which a connecting recess is formed on upper portions of both sides of the case. A printed circuit board is installed in the case and being mounted on upper sides of a plurality of light emitting diodes. The hollow cap is coupled in the connecting recess of the case, in which a plurality of wires passes through the cap. A synthetic resin material for covering the printed circuit board, the cap and the light emitting diode, the synthetic resin material being filled in the case. In this structure, the light emitting diode assembly can prevent the printed circuit board, transformer and the light emitting diode from being damaged by using an epoxy resin.

Claims

1. A light emitting diode assembly for an illuminated sign, the light emitting diode assembly comprising:

a case being open upwards, in which a connecting recess is formed on upper portions of both sides of the case;

a printed circuit board being installed in the case and being mounted on upper sides of a plurality of light emitting diodes;

a hollow cap being coupled in the connecting recess of the case, in which a plurality of wires pass through the cap; and

a synthetic resin material for covering the printed circuit board, the cap and the light emitting diode, the synthetic resin material being filled in the case.

2. The light emitting diode assembly for an illuminated sign as claimed in claim 1, wherein the cap includes a guiding pipe, in which a coupling groove is formed along a lower edge of the cap so that the cap is inserted into the connecting recess of the case, in which the guiding pipe outwardly protrudes from a one side of the guiding pipe.

3. The light emitting diode assembly for an illuminated sign as claimed in claim 1, wherein the printed circuit board includes a transformer, a rectified circuit, a constant voltage circuit and a constant current circuit, in which the transformer drops the voltage so that a common alternating current supplied through the wires are coincided with a driving voltage of the light emitting diode, in which the rectified circuit transforms the alternating current to direct current voltage, and the constant voltage circuit and the constant current circuit adjust a intensity of a direct voltage supplied through the wire so that the direct voltage is coincided with the driving voltage of the light emitting diode.

4. The light emitting diode assembly for an illuminated sign as claimed in claim 1, wherein the printed circuit board includes a constant voltage circuit and a constant current circuit for adjusting the intensity of a direct voltage supplied through the wire in order to harmonize the direct voltage with the driving voltage of the light emitting diode.

5. The light emitting diode assembly for an illuminated sign as claimed in claim 1, wherein the synthetic resin material comprises an epoxy resin.