WO2014146438A1

WO2014146438A1 - Led tube with large beaming angle of 120 degrees to 360 degrees

Info

Publication number: WO2014146438A1
Application number: PCT/CN2013/087087
Authority: WO
Inventors: Lapwah LIN; Qian Du; Kamchow LEUNG
Original assignee: Lin Lapwah
Priority date: 2013-03-22
Filing date: 2013-11-13
Publication date: 2014-09-25
Also published as: CN203036351U

Abstract

An LED tube with a large beaming angle of 120-360 degrees comprises a cover (1), at least one LED light bar and a light bar fixing seat (2). The LED light bar comprises a circuit board (3) and at least one LED bead (4) coupled thereon. The cover is provided with an axial opening, and both sides of the light bar fixing seat are clamped at the axial opening. The light bar fixing seat is provided with 1-4 mounting surfaces coaxial with the cover for mounting the LED light bar. By clamping both sides of the light bar fixing seat at the axial opening of the cover, the beaming angle of the light irradiated by the LED light bar to the cover relative to the central axis of the cover is larger than 120 degrees, between 120-360 degrees; and after the light rays are reflected by the cover, the whole LED tube has not any or greatly reduced black area, with uniform scattering of the light rays, and the light rays become clearer and brighter after passing through the cover with light scattering function.

Description

LED TUBE WITH LARGE BEAMING ANGLE OF 120 DEGREES TO 360

DEGREES

TECHNICAL FIELD

The present utility model relates to an LED tube, in particular to an LED tube with a large beaming angle.

BACKGROUND ART

In a conventional LED tube, an LED bead is soldered on an aluminum substrate (PCB), and is then adhered to an aluminum case via thermally conductive adhesive for heat dissipation, and a driver is used for voltage transformation and regulation as well as current limitation. After the tube is energized, the LED bead emits light. As the working power of each LED bead has been prefabricated within a certain range, the number of LED bead to be used is thus determined dependent upon the required output power, and the specification of the driver is designed according to a power that is sufficient to run the LED safely. Driver for LED bead must be carefully selected otherwise damage to the LED may cause.

Generally speaking, light source for public lightings currently on market are mainly fluorescent lamps. These fluorescent lamps are mostly mounted on brackets or lamp panels, and most of them utilize the light reflection and refraction principle of the brackets or lamp panels to enhance luminance thereof.

Compared with fluorescent lamps, LED lamps can save 55% - 65% of power and thus cost on electricity, moreover, the LED lamps especially LED tubes can be installed easily. For example, during installation, it only necessary to replace the original fluorescent tube with LED tube and remove the ballast and the electric fluorescent starter. If an Alternating Current power supply is used, an 85V - 265V alternating current mains can be directly applied to the two ends of a LED tube, and if a Direct Current source is adopted, a 15V - 220V Direct Current can be directly applied to the two ends of a LED tube.

A LED tube always has a service life of over 10 times of that for an ordinary florescent tube, and is almost maintenance-free, i.e. problems such as replacement of the tube, the ballast and the electric fluorescent starter can be avoided, and the expense saved therefrom in about half a year can compensate for the cost of the Led tube. Moreover, LED lamp is soft in ray, pure in color, and beneficiary to human eyesight protection and body health which make it an environment-friendly semi-conductor electric light source.

However, the existing LED lamp has following disadvantages: the LED lamp can only outputs light at a beaming angle of 120 degrees, which lacks brightness uniformity and represents strong convergence behavior. When lamp panel and reflecting bracket are used, reflection and refraction can hardly occur such that high brightness can only be achieved right below the LED lamp.

SUMMARY OF THE UTILITY MODEL

In view of the above, it is one objective of the utility model to provide an LED tube with a large beaming angle, i.e. from 120 degrees to 360 degrees in order to solve the above problems.

The utility model is implemented by the following technical solutions:

A LED tube having a 120 degrees to 360 degrees large beaming angle is provided which comprises a cover, at least one LED light bar and a light bar fixing seat, wherein each of the at least one LED light bar comprises a circuit board and at least one LED bead mounted thereon, the cover is provided with an axial opening to which the light bar fixing seat is engaged by its both sides; wherein the light bar fixing seat is provided with one to four mounting surfaces extended coaxial with the cover for mounting the at least one LED light bar.

The LED light bar is formed by soldering the at least one LED bead on the circuit board, which is then mounted on one of the mounting surfaces of the light bar fixing seat. The light emitted by the at least one LED bead is scattered by the cover to provide illumination. Preferably, each LED light bar comprises a plurality of LED beads. As the axial opening is located at a side of the central axis of the cover, the beaming angle of the light emitted by the LED light bar with reference to the central axis of the cover is larger than 120 degrees, e.g. may reach a range between 120 degrees to 360 degrees, and after the light rays are reflected by the cover, dark zone within the LED tube can be eliminated or can be greatly reduced.

In one embodiment, the number of the mounting surface can be one and is located at the axial opening. The mount surface can be arranged such that it is directly opposite the axis of the cover.

[0008] In another embodiment, the number of the mounting surfaces can also be two, and the mounting surfaces are located at an inner side of the axial opening; the two mounting surfaces are connected with each other to form the shape of an inverted V; and the joint line of the inverted V-shaped mounting surfaces is directly opposite the axis of the cover. In such an arrangement, the included angle between the two inverted V-shaped arranged mounting surfaces should be set within a range such that illuminated areas of the LED light bars respectively mounted on the two mounting surfaces have an intersecting point on the cover or in the cover, and tight joint between the light emitted by the two LED light bars is ensured as a result.

In yet another embodiment, the number of the mounting surfaces can also be three, and the mounting surfaces are located at the inner side of the axial opening; the three mounting surfaces are connected with each other to form a π shape with the middle surface of the π-shaped mounting surfaces is directly opposite the axis of the cover. In such a structure, relative positions of the three mounting surfaces should ensure the light-emitting areas of the LED light bars respectively mounted on two adjacent mounting surfaces have an intersecting point on the cover or in the cover, so as to ensure tight joint of the light emitted by the two adjacent LED light bars.

Preferably, the light bar fixing seat is provided with a radiating groove at the outer side; the light bar fixing seat is an aluminum seat or a copper seat; and the LED light bar is mounted on the mounting surface of the light bar fixing seat through a thermally conductive adhesive. Heat generated by the LED light bar is conducted by the light bar fixing seat to the outer side and diffused to the air, and the radiating groove is beneficial to increasing the surface area and improving the radiating effect

The number of the mounting surfaces can also be four, and the mounting surfaces are connected with each other to form a square; and the square mounting surfaces are coaxial with the cover.

The utility model has the following beneficial effects:

According to the utility model, by clamping both sides of the light bar fixing seat at the axial opening of the cover, the beaming angle of the light irradiated by the LED light bar to the cover relative to the central axis of the cover is larger than 120degrees, between 120-360degrees; after the light rays are reflected by the cover, the whole LED tube has not any or greatly reduced black area, with uniform scattering of the light rays, and the light rays become clearer and brighter after passing through the cover with light scattering function; no matter one, two, three or four mounting surfaces are adopted, the light bar fixing seat of the utility model has a very simple structure, and is convenient and quick to mount, and by providing the radiating groove, the whole tube meets the radiating requirement.

These and other objects, features and advantages of the present invention will become more apparent upon reading the following specification in conjunction with the accompanying drawing figures.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural schematic view of a transverse section of an LED tube with a 120-360degrees large beaming angle according to a first embodiment of the utility model;

FIG. 2 is a structural schematic view of a transverse section of an LED tube with a 120-360degrees large beaming angle according to a second embodiment of the utility model;

FIG. 3 is a structural schematic view of a transverse section of an LED tube with a 120-360degrees large beaming angle according a third embodiment of the utility model; and

FIG. 4 is a fourth structural schematic view of a transverse section of an LED tube with a 120-360degrees large beaming angle according to the utility model. wherein different reference signs represent different parts of the structure: cover 1 ; light bar fixing seat 2; circuit board 3; and LED bead 4.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Embodiments of the utility model will now be described in detail with reference to the drawings as accompanied.

To facilitate an understanding of the principles and features of the various embodiments of the invention, various illustrative embodiments are explained below. Although preferred embodiments of the invention are explained in detail, it is to be understood that other embodiments are contemplated. Accordingly, it is not intended that the invention is limited in its scope to the details of construction and arrangement of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or carried out in various ways. Also, in describing the preferred embodiments, specific terminology will be resorted to for the sake of clarity.

It must also be noted that, as used in the specification and the appended claims, the singular forms "a," "an" and "the" include plural references unless the context clearly dictates otherwise. For example, reference to a component is intended also to include composition of a plurality of components. References to a system containing "a" component is intended to include other components in addition to the one named.

Also, in describing the preferred embodiments, terminology will be resorted to for the sake of clarity. It is intended that each term contemplates its broadest meaning as understood by those skilled in the art and includes all technical equivalents, which operate in a similar manner to accomplish a similar purpose.

Ranges may be expressed herein as from "about" or "approximately" one particular value and/or to "about" or "approximately" another particular value. When such a range is expressed, other exemplary embodiments include from the one particular value and/or to the other particular value.

The words "comprising," "containing," or "including" conveys that at least the named compound, element, particle, or method step is present in the composition or article or method, but does not exclude the presence of other compounds, materials, particles, method steps, even if the other such compounds, material, particles, method steps have the same function as what is named. The materials described hereinafter as making up the various elements of the present invention are intended to be illustrative and not restrictive. Many suitable materials that would perform the same or a similar function as the materials described herein are intended to be embraced within the scope of the invention. Such other materials not described herein can include, but are not limited to, materials that are developed after the time of the development of the invention.

Embodiment 1 :

An LED tube with 120 degrees to 360 degrees large beaming angle according to one embedment of the utility model is shown in FIG. 1. The Led tube comprises a cover 1, an LED light bar and a light bar fixing seat 2. In this arrangement, the LED light bar is consisted of a circuit board 3 and an LED bead 4 coupled thereto. The cover 1 is provided with an axial opening (reference sign not assigned) by which both sides of the light bar fixing seat 2 are clamped by means of a clamping structure formed by two clamping slots (reference sign not assigned) provided on respective side of the light bar fixing seat 2 and two edges of the cover 1 which defines the axial opening. The light bar fixing seat 2 is provided with one mounting surface (reference sign not assigned) coaxially arranged with the cover 1 for mounting the LED light bar. The mounting surface is arranged to be located at the axial opening such that the mounting surface is arranged is directly opposite the central axis of the cover 1. The number of the LED light bar is one and is mounted on the mounting surface of the light bar fixing seat 2 via thermally conductive adhesive. The light bar fixing seat 2 is provided with heat dissipation grooves (reference sign not assigned) on the outer side, and the light bar fixing seat 2 can be made of aluminum seat or copper.

In such a configuration, as the beaming angle of the LED bead 4 itself is 120 degrees (see arrows in FIG. 1), and the LED bead 4 is located at the lower half of the cover 1 divided by the central axis, light emitted by the whole LED light bar, after being irradiated to the cover 1, is still at an angle of 120 degrees relative to the LED light bar, however, the angle is certainly larger than 120 degrees relative to the central axis of the cover 1, i.e. approximately 200 degrees. As the beaming angle of the whole tube normally refers to the angle of the light irradiated to the cover 1 relative to the central axis of the cover 1, the beaming angle of the LED tube in the present embodiment is thus wider than 120 degrees. Moreover, the LED tube can be easily fabricated and assembled as the structure of the light bar fixing seat 2 is very simple.

Embodiment 2:

As shown in Fig. 2, in this embodiment, two mounting surfaces (reference sign not assigned) arranged coaxial with the cover 1 are provided on a light bar fixing seat 2 for mounting each thereon a LED light bar. The two mounting surfaces are located at the inner side of the axial opening and connected with each other to form the shape of an inverted V. The two surfaces are arranged such that the jointing line of the inverted V-shaped mounting surfaces is directly opposite to the axis of the cover 1. In this embodiment, two LED light bars are provided and with one LED light bar mounted on one mounting surface of the light bar fixing seat 2 via thermally conductive adhesive. The rest structure of the LED tube is identical to that in embodiment 1.

In such a structure, as the beaming angle of each LED bead 4 itself is 120 degrees (see the arrows in Fig. 2), after the light emitted by the two LED light bars is jointed, the angle of the whole emitting area relative to the central axis of the cover 1 can reach about 300 degrees which is far larger than 120 degrees, that is, the beaming angle of the LED tube in this embodiment can reach about 300 degrees which is far wider than 120 degrees. Moreover, the LED tube can be easily fabricated and assembled as the structure of the light bar fixing seat 2 is very simple.

Embodiment 3 :

As shown in Fig. 3, the light bar fixing seat 2 is provided with three mounting surfaces (reference sign not assigned) arranged coaxial with the cover 1 for mounting LED light bars, and the three mounting surfaces are located at the inner side of the axial opening and connected with each other to form a π shape. The three surfaces are arranged such that the middle surface of the π-shaped mounting surfaces is directly opposite axial the cover 1. Three LED light bars are provided in this embodiment with each one attached to one mounting surface of the light bar fixing seat 2 via thermally conductive adhesive. The rest of the structure is identical with that in embodiment 1.

In such a structure, as the beaming angle of each LED bead 4 itself is 120 degrees (see arrows in Fig. 3), and after the light emitted by two adjacent LED light bars is jointed, the angle of the whole emitting area relative to the central axis of the cover 1 can reach about 330 degrees which is far wider than 120degrees, that is, the beaming angle of the LED tube in the embodiment can be as wide as about 330 degrees which is far wider than 120 degrees. Moreover, the LED tube can be easily fabricated and assembled as the structure of the light bar fixing seat 2 is very simple.

Embodiment 4:

As shown in Fig. 4, a light bar fixing seat 2 is provided with four mounting surfaces (reference sign not assigned) all of which are arranged coaxial with the cover 1 for mounting LED light bars. The four mounting surfaces are connected with each other to form a cuboid with each of the mounting surfaces of the cuboid being arranged coaxial with the cover 1. Each of the four mounting surfaces of the light bar fixing seat 2 is coupled thereon a light bar via thermally conductive adhesive which makes the total number of light bars used four. The rest of the structure is identical with that in embodiment 1.

In such a structure, as the beaming angle of each LED bead 4 of a light bar itself is 120 degrees (see arrows in FIG. 4), and after the light emitted by two adjacent LED light bars is jointed, the angle of the whole emitting area relative to the central axis of the cover 1 can reach 360 degrees which is far wider than 120 degrees as for a single LED bead, i.e., leaving no dark zone within the LED tube.

The specific configurations, choice of materials, and the size and shape of various elements can be varied according to particular design specifications or constraints requiring a device, system, or method constructed according to the principles of the invention. For example, while certain exemplary ranges have been provided for beaming angles and other parameters, other configurations can be used for, for example and not limitation, different environments or application regimes. Such changes are intended to be embraced within the scope of the invention. The presently disclosed embodiments, therefore, are considered in all respects to be illustrative and not restrictive. The scope of the invention is indicated by the appended claims, rather than the foregoing description, and all changes that come within the meaning and range of equivalents thereof are intended to be embraced therein.

Claims

WHAT IS CLAIMED IS:

1. An LED tube having a wide beaming angle of about 120 degrees to 360 degrees, comprising, a cover,

at least one LED light bar, and

a light bar fixing seat,

wherein the LED light bar comprises a circuit board and at least one LED bead coupled thereon,

wherein the cover is provided with an axial opening into which the light bar fixing seat is clamped from both sides; and

wherein the light bar fixing seat is provided with one to four mounting surfaces extended coaxial with the cover for mounting the at least one LED light bar.

2. The LED tube according to claim 1, wherein one mounting surface is provided on the light bar fixing seat which is located at and is disposed in alignment with the axial opening such that the mounting surface is directly opposite the axis of the cover.

3. The LED tube according to claim 1, wherein two mounting surfaces are provided on the light bar fixing seat facing an inner side of the axial opening; the two mounting surfaces are connected with each other to form the shape of an inverted V; and the joint line of the inverted V-shaped mounting surfaces is directly opposite the axis of the cover.

4. The LED tube according to claim 1, wherein three mounting surfaces are provided on the light bar fixing seat facing an inner side of the axial opening; the three mounting surfaces are connected with each other to form a π shape; and the π-shaped mounting surfaces are arranged such that the middle surface of the morning surfaces is directly opposite the axis of the cover.

5. The LED tube according to any of claims 1 to 4, wherein the light bar fixing seat is provided with heat dissipation grooves on an outer side thereof.

6. The LED tube according to any of claims 1 to 4, wherein the light bar fixing seat is made of aluminum or copper.

7. The LED tube according to any of claims 1 to 4, wherein the LED light bar is mounted on the mounting surface of the light bar fixing seat via thermally conductive adhesive.

8. The LED tube according to claim 1, wherein four mounting surfaces are provided and are connected with each other to form a cuboid which have a mounting surface being arranged coaxially with the cover.