LIGHT-EMITTING DIODE LIGHT BULB

Abstract

A light-emitting diode (LED) light bulb includes an outer housing assembly, an inner housing assembly, an LED circuit board and a lamp cap. The outer housing assembly has a non-metallic outer shell and an inner shell affixed to an inner wall of the outer shell. The inner housing assembly is mounted inside the outer housing assembly through a lower opening of the outer housing assembly and is non-metallic and elongated with one end thereof securely connected with the base. The LED circuit board is mounted on a top of the LED mounting disc. The lamp cap is non-metallic and covers the upper opening of the outer housing assembly. Because the outer housing assembly and the lamp cap enclose the LED circuit board therein, users do not easily get an electric shock when holding the outer housing assembly or the lamp cap upon mounting or dismounting the LED light bulb to or from an LED lamp holder.

Claims

1. A light-emitting diode (LED) light bulb, comprising: a base adapted to be mounted into a lamp holder; an outer housing assembly being hollow and having: a lower opening; an upper opening; an outer shell being non-metallic; an inner shell being metallic and affixed to an inner wall of the outer shell; and an LED mounting disc being metallic, mounted on a portion of an inner wall of the inner shell adjacent to the upper opening, and located below the upper opening; an inner housing assembly mounted inside the outer housing assembly through the lower opening of the outer housing assembly, being elongated with one end thereof securely connected with a top end of the base, and having: a tube being non-metallic; and an LED driver mounted inside the tube; an LED circuit board mounted on a top of the LED mounting disc, electrically connected between the LED driver of the inner housing assembly and the base, and having multiple LEDs mounted on a top of the LED circuit board; and a lamp cap being non-metallic and stuck on a top edge of the outer housing assembly to cover the upper opening of the outer housing assembly, wherein the outer housing assembly and the lamp cap jointly receive the LED circuit board and the LED mounting disc of the outer housing assembly therein.

2. The LED light bulb as claimed in claim 1, wherein the outer shell is made of plastic.

3. The LED light bulb as claimed in claim 1, wherein the lamp cap is made of plastic.

4. The LED light bulb as claimed in claim 2, wherein the lamp cap is made of plastic.

5. The LED light bulb as claimed in claim 1, wherein the tube of the inner housing assembly has two fixing holes formed in a top edge portion of the tube; the LED mounting disc has two first through holes and a first terminal hole formed through the LED mounting disc; the LED circuit board has two second through holes and a second terminal hole formed through the LED circuit board; and two self-tapping screws sequentially pass through the respective second through holes of the LED circuit board and the respective first through holes of the mounting disc to engage the respective fixing holes of the tube and fasten the outer housing assembly on the inner housing assembly.

6. The LED light bulb as claimed in claim 2, wherein the tube of the inner housing assembly has two fixing holes formed in a top edge portion of the tube; the LED mounting disc has two first through holes and a first terminal hole formed through the LED mounting disc; the LED circuit board has two second through holes and a second terminal hole formed through the LED circuit board; and two self-tapping screws sequentially pass through the respective second through holes of the LED circuit board and the respective first through holes of the mounting disc to engage the respective fixing holes of the tube and fasten the outer housing assembly on the inner housing assembly.

7. The LED light bulb as claimed in claim 3, wherein the tube of the inner housing assembly has two fixing holes formed in a top edge portion of the tube; the LED mounting disc has two first through holes and a first terminal hole formed through the LED mounting disc; the LED circuit board has two second through holes and a second terminal hole formed through the LED circuit board; and two self-tapping screws sequentially pass through the respective second through holes of the LED circuit board and the respective first through holes of the mounting disc to engage the respective fixing holes of the tube and fasten the outer housing assembly on the inner housing assembly.

8. The LED light bulb as claimed in claim 4, wherein the tube of the inner housing assembly has two fixing holes formed in a top edge portion of the tube; the LED mounting disc has two first through holes and a first terminal hole formed through the LED mounting disc; the LED circuit board has two second through holes and a second terminal hole formed through the LED circuit board; and two self-tapping screws sequentially pass through the respective second through holes of the LED circuit board and the respective first through holes of the mounting disc to engage the respective fixing holes of the tube and fasten the outer housing assembly on the inner housing assembly.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is a perspective view of an LED light bulb in accordance with the present invention;

[0019] FIG. 2 is an exploded perspective view of the LED light bulb in FIG. 1; and

[0020] FIG. 3 is an exploded perspective view of a conventional LED light bulb.

DETAILED DESCRIPTION OF THE INVENTION

[0021] With reference to FIGS. 1 and 2, a light-emitting diode (LED) light bulb in accordance with the present invention includes a base 11, an inner housing assembly 12, an outer housing assembly 13, an LED circuit board 14 and a lamp cap 15.

[0022] The base 11 is metallic, is externally threaded, and is mounted into a lamp holder through threaded connection to receive an operating power. The inner housing assembly 12 is elongated with one end thereof securely connected with a top end of the base 11 and has a tube 120 and an LED driver 123. The tube 120 is non-metallic and has two fixing holes 1201 formed in the top end of the tube 120. The LED driver 123 is mounted inside the tube 120 and is electrically connected between the LED circuit board 14 and the base 11. In the present embodiment, the tube 120 is made of plastic.

[0023] The outer housing assembly 13 is bowl-like and hollow and has a lower opening 131, an upper opening 132, an LED mounting disc 133, an outer shell 134 and an inner shell 135.

[0024] The inner housing assembly 12 is mounted into the outer housing assembly 13 through the lower opening 131. The LED mounting disc 133 is metallic, is mounted on a portion of an inner wall of the inner shell 135 adjacent to the upper opening 132, is located below the upper opening 132, and has two first through holes 1330 and a first terminal hole 1331 formed through the LED mounting disc 133. The outer shell 134 is non-metallic. In the present embodiment, the outer shell 134 is made of plastic. The LED mounting disc 133 conducts heat generated by the LED circuit board 14 to the inner shell 135. The inner shell 135 is metallic, is affixed to an inner wall of the outer shell 134, and serves to dissipate heat generated by the LED circuit board 14 away from the LED circuit board 14. In the present embodiment, the inner shell 135 is made of aluminum. The LED circuit board 14 is mounted on a top of the LED mounting disc 133 and has two second through holes 140, a second terminal hole 141 and multiple LEDs 142. The two second through holes 140 and the second terminal hole 141 are formed through the LED circuit board 14. The multiple LEDs 142 are mounted on a top of the LED circuit board 14. Two self-tapping screws 143 sequentially pass through the respective second through holes 140 of the LED circuit board 14 and the respective first through holes 1330 of the mounting disc 133 to engage the respective fixing holes 1201 of the tube 120 and fasten the outer housing assembly 13 on the inner housing assembly 12. The lamp cap 15 is non-metallic, dome-like and translucent and is stuck on a top edge of the outer housing assembly 13. The lamp cap 15 covers the upper opening 132 of the outer housing assembly 13, and the lamp cap 15 and the outer housing assembly 13 jointly receive the LED circuit board 14 and the LED mounting disc 133 therein. In the present embodiment, the lamp cap 15 is made of plastic.

[0025] Upon installation of the LED light bulb, users can hold the LED light bulb with fingers to grab the outer shell 134 of the outer housing assembly 13. Since the outer shell 134 and the lamp cap 15 enclosing all electrically conducting elements are non-metallic, there is no hazard of electric shock when users hold the outer shell 134 and/or the lamp cap 15 to mount or dismount the LED light bulb to or from an LED lamp holder.

[0026] Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only. Changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.