ILLUMINATION LIGHT SOURCE AND LIGHTING APPARATUS

• US 20140252946A1
• Filed: 02/28/2014
• Published: 09/11/2014
• Est. Priority Date: 03/08/2013
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: FUJITA, Hiroshi, ITOH, Kazuhiko, HACHIYA, Yoshiaki, GOUDA, Kazuo
• Granted Patent: US 9,137,860 B2
• Time in Patent Office: Days
• US Class Current: 315/51
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21K 9/278 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H05B 45/3577 Emulating the dimming characteristics, brightness or colour temperature of incandescent lamps
• CPC Class Codes: H05B 45/3578 Emulating the electrical or functional characteristics of discharge lamps
• CPC Class Codes: H05B 45/39 Circuits containing inverter bridges
• CPC Class Codes: H05B 47/10 Controlling the light source

Abstract

A light bulb-shaped lamp according to the present invention includes: a board on which an LED is mounted; a circuit board on which a drive circuit that turns on the LED is mounted; output wires for supplying power for turning on the LED from the drive circuit to the LED; a pedestal; and a potential-stabilizing wire electrically connecting the pedestal to a circuit ground of the drive circuit.

Claims

1. An illumination light source comprising:

a module board on which a light-emitting element is mounted;

a circuit board on which a drive circuit that turns on the light-emitting element is mounted;

an output wire for supplying power for turning on the light-emitting element from the drive circuit to the light-emitting element;

a metal component; and

a reference potential wire electrically connecting the metal component to a reference potential of the drive circuit.

2. The illumination light source according to claim 1,

wherein the metal component is a metallic structural component.

3. The illumination light source according to claim 1,

wherein the metal component is a pedestal that supports the module board.

4. The illumination light source according to claim 3,

wherein the metal component is a heat sink that is thermally connected to the module board via the pedestal, the heat sink being for dissipating heat generated by the light-emitting element, and

the heat sink surrounds the drive circuit.

5. The illumination light source according to claim 4,

wherein the heat sink includes an opening portion into which the pedestal is fit, and

the reference potential wire is pinched between the pedestal and the opening portion of the heat sink.

6. The illumination light source according to claim 3,

wherein the pedestal is elongated.

7. The illumination light source according to claim 1, further comprising

a low-profile case that houses the module board and the circuit board.

8. The illumination light source according to claim 1,

wherein the reference potential wire is wound around the metal component.

9. The illumination light source according to claim 1, further comprising

a capacitor connected in series with the reference potential wire, between the reference potential of the drive circuit and the metal component.

10. The illumination light source according to claim 1,

wherein the reference potential wire is a stranded wire.

11. The illumination light source according to claim 1,

wherein the reference potential of the drive circuit is a ground potential of the drive circuit.

12. The illumination light source according to claim 1,

wherein the drive circuit includes:

a direct current power source circuit that converts a first alternating current voltage inputted to the illumination light source to direct current voltage and outputs the converted direct current voltage; and

a high frequency generator circuit that includes an inverter circuit including a switching element, an inductor, and a capacitor, and converts the direct current voltage outputted from the direct current power source circuit to a second alternating current voltage of higher frequency than a frequency of the first alternating current voltage, and

the output wire has a potential that varies in synchronization with a switching operation of the switching element.

13. A lighting apparatus comprising

the illumination light source according to according to claim 1.