Structure of light bulb

• US 20100148650A1
• Filed: 12/17/2008
• Published: 06/17/2010
• Est. Priority Date: 12/17/2008
• Status: Active Grant

• Current Assignee: U-How Co., Ltd.
• Original Assignee: U-How Co., Ltd.
• Inventors: Wu, Ping-Chen, Wu, Ping-Ju
• Granted Patent: US 7,976,206 B2
• Time in Patent Office: Days
• US Class Current: 313/1
• 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 9/61 using light guides
• CPC Class Codes: F21V 13/02 Combinations of only two kinds of elements
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 7/043 with cylindrical surface
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A light bulb includes a bulb body, a light guide, and at least one light-emitting diode (LED). The bulb body includes a light-transmitting shell and a conductive base. The light-transmitting shell is mounted to the base. A circuit board is fixed at one side of the base and is in electrical connection with the base. The LED is mounted to the circuit board that is arranged at one side of the base, and the LED is in electrical connection with the circuit board to provide an internal light source. The light guide is arranged inside the bulb body and has an end forming a cavity that receives the LED therein, whereby the light guide is set erect on the base. As such, advantages of easy manufacturing, reduced costs, operation safety, increased angular range of illumination, and extended lifespan can be provided.

Claims

1. A light bulb, comprising:

a bulb body comprising a light-transmitting shell and a conductive base, the light-transmitting shell being mounted to the base, a circuit board being fixed to one side of the base and in electrical connection with the base;

at least one light-emitting diode mounted to the circuit board that is fixed at one side of the base, the at least one light-emitting diode being in electrical connection with the circuit board to provide an internal light source; and

a light guide arranged inside the bulb body and having an end forming a cavity receiving the at least one light-emitting diode therein, the light guide being erected on the base.

2. The light bulb as claimed in claim 1, wherein the light-transmitting shell is made of a material selected from a group consisting of clear glass, clear plastics, frosted glass, and frosted plastics.

3. The light bulb as claimed in claim 1, wherein the light guide has an outer surface on which a reflective layer is formed to reflect light emitting from the light source, the light guide having a top end forming a sphere for deflecting the light.

4. The light bulb as claimed in claim 1, wherein the light guide has a surface that is roughened for defracting light.

5. The light bulb as claimed in claim 1, wherein the light guide comprises a reflective layer contained therein for deflecting light.

6. The light bulb as claimed in claim 1, wherein the base has an outer surface forming a helical and electrically conductive configuration for threading engagement with a socket of an external power source to establish electrical connection therebetween.

7. The light bulb as claimed in claim 3, wherein the base has an outer surface forming a helical and electrically conductive configuration for threading engagement with a socket of an external power source to establish electrical connection therebetween.

8. The light bulb as claimed in claim 4, wherein the base has an outer surface forming a helical and electrically conductive configuration for threading engagement with a socket of an external power source to establish electrical connection therebetween.

9. The light bulb as claimed in claim 5, wherein the base has an outer surface forming a helical and electrically conductive configuration for threading engagement with a socket of an external power source to establish electrical connection therebetween.

10. The light bulb as claimed in claim 1, wherein the base has a face forming two conductive terminals for plugging into a socket of an external power source to establish electrical connection therebetween.

11. The light bulb as claimed in claim 3, wherein the base has a face forming two conductive terminals for plugging into a socket of an external power source to establish electrical connection therebetween.

12. The light bulb as claimed in claim 4, wherein the base has a face forming two conductive terminals for plugging into a socket of an external power source to establish electrical connection therebetween.

13. The light bulb as claimed in claim 5, wherein the base has a face forming two conductive terminals for plugging into a socket of an external power source to establish electrical connection therebetween.

14. The light bulb as claimed in claim 1, wherein the light guide contains therein diffusion powders for smoothening light emitting from the light source.