Patent Application
20120194071
1. Field of the Invention
The present invention relates to the field of an LED light bulb, and more particularly to a multi-tubular LED light bulb.
2. Description of Related Art
The LED has the characteristic of lower energy consumption and is therefore used to be a light source of the illuminator. The traditional light source of the illuminator is replaced with the LED. With reference to
Since the LED of the LED light bulb has directional lighting characteristic and all of the LEDs are mounted on a same face of the circular printed circuit board, the LED light bulb provides lighting in only one direction and limits an illuminating range. In addition, the LED light bulb does not provide high brightness since the area of the face of the circular printed circuit board is too small and the number of the LEDs is limited.
To overcome the shortcomings, the present invention provides a multi-tubular LED light bulb to mitigate or obviate the aforementioned problems.
The main objective of the present invention is to provide a multi-tubular LED light bulb having high and even brightness.
The multi-tubular LED light bulb has a seat having a power plug, multiple glass tubes mounted on the seat, multiple multi-directional lighting LED strips respectively mounted inside the glass tubes and an AC to DC converting circuit board mounted inside the seat and connected to the power plug to obtain AC power and converting the AC power to DC power. The multi-directional lighting LED strips are electronically connected to the DC power source from the AC to DC converting circuit in parallel. Since the LED light bulb has multiple multi-directional lighting LED strips, different directional lightings and even brightness are provided. Further, heat from the LED strip is easily and quickly transmitted to the sidewall of the glass tube to expend the lifetime of the LED light bulb since the multi-directional lighting LED strips are close to a sidewall of the corresponding glass tube.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
The seat 10 has a hollow base 11, a cover 12 and a power plug 13. The hollow base 11 has a top opening covered by the cover 12. Multiple through holes 121 are defined through the cover 12. The power plug 13 is mounted on a bottom of the hollow base 11. In the first embodiment, the type of the power plug is Edisson screw including E27, E14, B22 etc. With further reference to
The glass tubes 20 are respectively inserted into the corresponding through holes 121 of the seat 10, so that a bottom portion of each glass tube 20 is mounted on the seat 10. In the first embodiment, the LED light bulb 10 has four glass tubes 20 and may further has four supports 24 respectively connected between outsides of the two corresponding adjacent glass tubes 20. The support 24 may maintain a fixed gap between the two adjacent glass tubes 20. Each of the at least one support 24 has a length matching a distance between the two through hole 121, where the corresponding adjacent glass tubes 20 are inserted. Each glass tube 20 has a cylinder body 21, a bell-shaped bubble 22 and an airtight pipe 23. The bell-shaped bubble 22 is received inside the cylinder body 21 from a bottom opening 211 and a bottom of the bell-shaped bubble 22 is integrally connected to bottom edge of the cylinder body 21, wherein the bottom edge is formed around the bottom opening 211. The airtight pipe 23 downwardly extends from a top of the bell-shaped bubble 22 and communicates with an inner space of the cylinder body 21.
Multiple multi-directional lighting LED strips 30 are respectively mounted inside the glass tubes 20. Each multi-directional lighting LED strip 30 is mounted inside the corresponding glass tube 20 and has multiple lengthwise LED circuit boards 31, a lateral LED circuit board 32 and two power pins 33. In the preferred embodiment, four LED lengthwise circuit boards 31 are arranged in a cross shape and the lateral LED circuit board 32 is mounted across top of the lengthwise LED circuit boards 31. The power pins 33 are mounted on the lengthwise LED circuit boards 31 and passing through outside the bottom opening 211 of the glass tube 20. In a preferred embodiment, two power pins 33 are passing through a gap between the bell-shaped bubble 22 and the airtight pipe 23 and protruding outside the bottom opening 211 of the glass tube 20. Since multiple LEDs are mounted on two opposite sides of the lengthwise LED circuit boards 31, each lengthwise LED circuit 31 has two opposite lighting faces. Therefore, the multi-directional lighting LED strip 30 provides different directional lightings to have boarder lighting area. With further reference to
With further reference to
In addition, the inner space of the glass tube 20 may be further filled with gas having high heat conductive coefficient, such as inert gas including neon or argon, or nitrogen. To draw the gas in the inner space of the glass tube 20, the multi-directional lighting LED board 30 is inserted into the inner space of the glass tube 20 from the bottom opening 211 thereof before forming the bell-shaped bubble and the airtight pipe. When the multi-directional lighting LED strip 30 is mounted inside the inner space of the glass tube 20, a preformed bell-shaped bubble 22 with a pipe having an opening is heated to adhere to the bottom edge of the cylinder body 21. Air in the inner space is drawn from the opening of the pipe until the inner space is vacuum. After then, the gas having high heat conductive coefficient is inserted into the inner space through the opening of the pipe 23 to prevent metal material on the circuit boards from being oxidized and the lifetime of the circuit boards is extended. In the final step, the opening of the pipe 23 is heated to be close to form the airtight pipe 23.
Based on the foregoing description, the LED light bulb has multiple multi-directional lighting LED strips and each LED strip has multiple lengthwise LED boards each of which has two lighting faces and a lateral LED board, so that the LED light bulb provides different directional lightings to have boarder lighting area and high and even brightness. In addition, since the glass tube is long and the multi-directional lighting LED strip is close to a sidewall of the glass tube, heat from the LED strip is easily and quickly transmitted to the sidewall of the glass tube to expend the lifetime of the LED light bulb.
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.
| Number | Date | Country | Kind |
|---|---|---|---|
| 100202259 | Jan 2011 | TW | national |
