WO2012152536A1

WO2012152536A1 - A lighting apparatus and a lighting system having the lighting apparatus

Info

Publication number: WO2012152536A1
Application number: PCT/EP2012/056939
Authority: WO
Inventors: Yaojun Feng; Yuanyuan He; Canbang Yang; Nimchung Ku; Yabin Luo
Original assignee: Osram Ag
Priority date: 2011-05-12
Filing date: 2012-04-16
Publication date: 2012-11-15
Also published as: CN102777777A; CN102777777B

Abstract

The present invention relates to a lighting apparatus comprising at least one shell body (1), a reflection structure and a plurality of light sources (2), wherein the shell body (1) comprises a top cover (3), side walls (4) and a light outlet (5) opposite to the top cover (3), and wherein the reflection structure includes two first reflectors (6) and a second reflector. The two first reflectors (6) are disposed on two opposite side walls (4), respectively, and each first reflector (6) has a plurality of first reflection bodies (7), and each first reflection body (7) is provided with one light source (2). The second reflector is disposed on the top cover (3). The first reflector (6) reflects the light from the light sources (2) to the second reflector, and the second reflector reflects the light to a direction towards the light outlet (5). In addition, the present invention relates to a lighting system having a plurality of lighting apparatus of the above type.

Description

A Lighting Apparatus and a Lighting System Having the

Lighting Apparatus

Technical Field

The present invention relates to a lighting apparatus and a lighting system having a plurality of the lighting apparatus.

Background Art LED is widely used in the linear lamp in the office lighting apparatus. However, since the LED itself has a very small size, a plurality of LEDs should be used in the linear lamp of the above type, which leads to generation of glare. In or^¬ der to solve this problem, there are various solutions in the prior art. One solution is that a light emitting side of an LED chip is provided with a diffusive cover that can effec^¬ tively eliminate the glare but reduces the lighting effi^¬ ciency of the lighting apparatus. Besides, a lighting system is also disclosed in the prior art. A shell body of the lighting system has a light outlet, a plurality of LED chips are arranged opposite to each other on both sides of the light outlet, wherein light emitting directions of the LED chips arranged on both sides are opposite to each other, and a light guide plate is provided between the LED chips on both sides; in addition, a reflection body is provided on one side opposite to the light outlet of the light guide plate, and a diffusive sheet is provided on one side facing the light out^¬ let of the light guide plate; moreover, the diffusive sheet covers the light outlet. In this solution, the light guide plate can make the light from the LED chips have a good light diffusivity. But due to application of the diffusive sheet, these solutions inevitably have the problem of quite low lighting efficiency, which likewise reduces the lighting per^¬ formances of the lighting system to a great extent. Summary of the Invention

In order to solve the above problem, the present invention provides a lighting apparatus and a lighting system having a plurality of the lighting apparatus. The first object of the present invention is accomplished via a lighting apparatus as follow, i.e. the lighting apparatus comprises at least one shell body, a reflection structure and a plurality of light sources, wherein the shell body com^¬ prises a top cover, side walls and a light outlet opposite to the top cover, the reflection structure includes two first reflectors and a second reflector, the two first reflectors are disposed on the two opposite side walls, respectively, each first reflector has a plurality of first reflection bod^¬ ies and each first reflection body is provided with one light source, and the second reflector is disposed on the top cover, the first reflectors reflect light from the light sources to the second reflector, and the second reflector re^¬ flects the light to a direction towards the light outlet. When a user looks at the lighting apparatus according to the present invention directly, no hot spot will be seen on the lighting apparatus, that is to say, no glare will be gener^¬ ated. The lighting apparatus illuminates uniformly. Moreover, as the lighting apparatus according to the present invention merely directly reflects the light through the reflection structure, no light will be lost; therefore, a very high lighting efficiency is further obtained.

According to a preferred solution of the present invention, the first reflection body comprises an installation face for placing the light source, a first reflection face provided on one side of the light source and a second reflection face provided on another side of the light source, wherein the first and second reflection faces are configured to reflect at least part of light on sides where they are located to the second reflector. In the lighting apparatus according to the present invention, the light sources provided in the first reflection bodies are arranged linearly on the side walls of the shell body, and the light emitted from the light sources is directed to the light sources on the opposite side and re^¬ flected to the second reflector through the first and second reflection faces of the first reflection bodies so as to pre^¬ vent most of the light from being irradiated directly from the light outlet and thus avoid generation of hot spots ef^¬ fectively.

Preferably, the first reflection face and the second reflec- tion face are asymmetrically arranged with respect to the light source so that the light from the light source is re^¬ flected towards the second reflector as much as possible.

According to a preferred solution of the present invention, the second reflection face comprises a first reflection por- tion and a second reflection portion, wherein the first reflection portion and the second reflection portion are arranged with a predetermined angle therebetween. Besides, the first reflection body further has an auxiliary reflection portion configured to obtain a uniform light distribution and extending to the direction of the light source starting from a place where the first reflection portion and the second re^¬ flection portion come into contact with each other. The light emitted from the light sources may be reflected several times within the reflection structure, and the light after re- fleeted several times may be finally reflected to the second reflector through the auxiliary reflection portions so as to effectively reduce the light loss and further improve the lighting efficiency of the lighting apparatus.

Preferably, the auxiliary reflection portion is designed to be a slope reflection body extending to the direction of the light source and rising up gradually, wherein the slope re^¬ flection body has a V shape that has a sharp end pointing to the light source; moreover, two side faces of the V-shaped slope reflection body are designed to be concave arc faces. This is further favorable to reflecting the light from the light sources to the second reflector.

According to a preferred solution of the present invention, the first reflection body further comprises a third reflec^¬ tion face configured to cut off light, wherein the third re- flection face extends in a direction of a light axis of the light source on the installation face. The third reflection face is provided between the second reflection portion and the first reflection face and intersects the first reflection face and the second reflection portion so as to effectively cut off the light emitted in this direction, and the cut-off light is reflected to the second reflector, which further re^¬ duces the light loss and improves the lighting efficiency.

Preferably, the first reflection face, the second reflection face and the third reflection face are designed to be arc faces, respectively. Of course, the above reflection faces also may be designed to be other types of reflection faces, for instance, plane reflection faces.

According to a preferred solution of the present invention, the light sources in the first reflector on one side are pro- vided on perpendicular bisectors of two neighboring light sources in the first reflector on the opposite side, so that the light from the light sources on both sides do not irradi^¬ ate each other and the direct light emitted from the light sources also may be reflected to the second reflector through the first reflector on the opposite side, thus, the light loss is prominently reduced and the lighting efficiency is improved .

Preferably according to the present invention, the second re^¬ flector is a microstructure formed by a plurality of second reflection bodies to enable the output light to obtain a good expected light distribution. Preferably, the second reflec^¬ tion bodies are jointly arranged into a curved arch in a di^¬ rection away from the light outlet, and the second reflection body has a cylindrical reflection face, a spherical reflec- tion face, a triangular reflection face or a pyramidal reflection face. A more uniform light distribution may be acquired through such second reflector formed by a plurality of the second reflectors, and a better lighting effect is ob- tained.

Preferably according to the present invention, the second re^¬ flector is designed to be a mirror type reflector or a diffu^¬ sive reflector so as to provide expected lighting effect ac^¬ cording to requirements. The other object of the present invention is accomplished via a lighting system having a plurality of the lighting apparatus of the above-mentioned types. This lighting system may include a plurality of lighting apparatus according to re^¬ quirements to obtain an expected lighting effect, effectively avoid generation of glare and have a quite high lighting ef^¬ ficiency .

Brief Description of the Drawings

The drawings constitute a portion of the Description for fur^¬ ther understanding of the present invention. These drawings illustrate the embodiments of the present invention and ex^¬ plain the principle of the present invention together with the Description. In the drawings,

Fig. 1 is a perspective view of a lighting apparatus accord^¬ ing to the present invention; Fig. 2 is a light path view of the lighting apparatus accord^¬ ing to the present invention;

Fig. 3 is a perspective view of a first reflection body of a first reflector in the lighting apparatus according to the present invention; Fig. 4 is a perspective view of the first reflection body ac- cording to Fig. 3 from another angle;

Fig. 5 is a light intensity distribution of light reflected by the first reflector of the lighting apparatus according to the present invention; Fig. 6 is a diagram of arrangement of light sources of the lighting apparatus according to the present invention;

Fig. 7 is a schematic diagram of a second reflector of the lighting apparatus according to the present invention;

Fig. 8 is a diagram of light distribution of the lighting ap- paratus according to the present invention; and

Fig. 9 is a schematic diagram of a lighting system according to the present invention.

Detailed Description of the Embodiments

Fig. 1 is a perspective view of a lighting apparatus accord- ing to the present invention. It can be seen from the figure that the lighting apparatus comprises a shell body 1, a re^¬ flection structure and a plurality of light sources 2, wherein the shell body 1 comprises a top cover 3, side walls 4 and a light outlet 5 opposite to the top cover 3, the re- flection structure includes two first reflectors 6 and a sec^¬ ond reflector 8 (see Fig. 7), the two first reflectors 6 are disposed on the two opposite side walls 4, respectively, each first reflector 6 has a plurality of first reflection bodies

7 that are arranged in a straight line on the side wall 4 and a group of the first reflection bodies 7 likewise are pro^¬ vided on the opposite side wall, each first reflection body 7 is provided with one light source 2, and the second reflector

8 is disposed on the top cover 3, the first reflectors 6 re^¬ flect light from the light sources 2 to the second reflector 8, and the second reflector 8 reflects the light to a direc^¬ tion towards the light outlet 5. Fig. 2 is a light path view of the lighting apparatus accord^¬ ing to the present invention. It can be seen from the figure that a part of light from a light source 2 on the left side is reflected to the second reflector 8 through a first re- flection face A of the first reflector 6 and goes out through the light outlet 5 after reflected by the second reflector 8, and the other part of light from the light source 2 is re^¬ flected to the second reflector 8 through a second reflection face B of the first reflector 6 and goes out through the light outlet 5 after reflected by the second reflector 8. The light path view of light from a light source 2 on the right side is not shown in the figure, but it is mirror-symmetrical with the light path view of the light from the light source on the left side. Fig. 3 is a perspective view of the first reflection body of the first reflector in the lighting apparatus according to the present invention. It can be seen from the figure that the first reflection body 7 comprises an installation face 9 for placing the light source 2, a first reflection face A provided on one side of the light source 2 and a second re^¬ flection face B provided on another side of the light source 2, wherein the first and second reflection faces A and B are configured to reflect at least part of light on the sides where they are located to the second reflector 8. It also can be seen from the figure that the first reflection face A and the second reflection face B are asymmetrically arranged with respect to the light source 2 so as to enable the light to be deflected towards a direction of the second reflector 8. Be^¬ sides, it further can be seen from the figure that the second reflection face B comprises a first reflection portion Bl and a second reflection portion B2 that are arranged with a pre^¬ determined angle therebetween. In addition, the first reflec^¬ tion body 7 further has an auxiliary reflection portion C configured to obtain a uniform light distribution and extend- ing to a direction of the light source 2 starting from a place where the first reflection portion Bl and the second reflection portion B2 come into contact with each other. The auxiliary reflection portion C is designed to be a slope reflection body extending to the direction of the light source 2 and rising up gradually, and particularly, the slope re^¬ flection body has a V shape that has a sharp end pointing to the light source 2, and two side faces of the V-shaped slope reflection body are designed to be concave arc faces. The specific configuration of the auxiliary reflection portion C may be further observed in Fig. 4.

Moreover, it also can be seen from Fig. 3 and Fig. 4 that the first reflection body 7 further comprises a third reflection face D configured to cut off light, wherein the third reflec^¬ tion face D extends in a direction of a light axis of the light source 2 on the installation face 9, and intersects the first reflection face A and the second reflection portion B2. It can be seen from Fig. 4 that the third reflection face D is arranged with a predetermined angle in relation to the in^¬ stallation face 9. The predetermined angle preferably is 30°- 90° .

In an embodiment according to the present invention, the first reflection face A, the second reflection face B and the third reflection face D are designed to be arc faces, respec^¬ tively. Of course, they also may be designed to be other types of reflection faces, for instance, plane reflection faces . Fig. 5 is a light intensity distribution of light reflected by the first reflector of the lighting apparatus according to the present invention. It can be seen from the figure that the light after reflected by the first reflector 6 according to the present invention is quite uniformly distributed in a horizontal direction but deflected for about 30° in a verti^¬ cal direction, i.e. deflected for about 30° towards the sec^¬ ond reflector 8, so that most of the light is reflected to the second reflector 8.

Fig. 6 is a diagram of arrangement of light sources of the _

y

lighting apparatus according to the present invention. In a solution of the present invention, LED is used as the light source 2. It can be seen from the figure that the light sources 2 in the first reflector 6 on one side are provided on perpendicular bisectors of two neighboring light sources 2 in the first reflector 6 on the opposite side, so that the light from the light sources 2 on both sides do not irradiate each other and the direct light emitted from the light sources 2 also may be reflected to the second reflector 8 through the first reflector 6 on the opposite side, thus, the light loss is prominently reduced and the lighting efficiency is improved

Fig. 7 is a schematic diagram of the second reflector of the lighting apparatus according to the present invention. A re- flection face of the second reflector 8 is designed to be a cylindrical face so that a uniformly distributed light output is obtained through the second reflector 8. In the present embodiment, the second reflector 8 has a microstructure formed by a plurality of second reflection bodies 10 that are jointly arranged into a curved arch in a direction away from the light outlet 5; moreover, the second reflection body 10 has a cylindrical reflection face, and of course, the second reflection body 10 also may have a spherical reflection face, a triangular reflection face or a pyramidal reflection face. Fig. 8 is a diagram of light distribution of the lighting apparatus according to the present invention. It can be seen from the figure that, after the light is reflected by the second reflector 8, a uniformly distributed light distribu^¬ tion is obtained in both horizontal and vertical directions. Fig. 9 is a schematic diagram of a lighting system according to the present invention. This lighting system is formed by connecting in series a plurality of lighting apparatus of the above-mentioned types. The shell bodies 1 of the lighting ap^¬ paratus are connected together side by side so as to obtain the lighting system capable of providing an expected lighting effect .

The above is merely preferred embodiments of the present in^¬ vention but not to limit the present invention. For the per^¬ son skilled in the art, the present invention may have vari- ous alterations and changes. Any alterations, equivalent sub^¬ stitutions, improvements, within the spirit and principle of the present invention, should be covered in the protection scope of the present invention.

List of reference signs

1 shell body

2 light source

3 top cover

4 side wall

5 light outlet

6 first reflector

7 first reflection body

8 second reflector

9 installation face

10 second reflection body A first reflection face B second reflection face Bl first reflection portion B2 second reflection portion

Claims

Patentanspriiche / Patent claims

1. A lighting apparatus comprising at least one shell body

(1) , a reflection structure and a plurality of light sources (2), the shell body (1) comprising a top cover (3), side walls (4) and a light outlet (5) opposite to the top cover (3), wherein the reflection structure includes two first re^¬ flectors (6) and a second reflector (8), the two first re^¬ flectors (6) are disposed on two opposite side walls (4), re- spectively, each of the first reflectors (6) has a plurality of first reflection bodies (7) and each of the first reflec^¬ tion bodies (7) is provided with one light source (2), and the second reflector (8) is disposed on the top cover (3), the first reflectors (6) reflect light from the light sources (2) to the second reflector (8), and the second reflector (8) reflects the light to a direction towards the light outlet (5) .

2. The lighting apparatus according to claim 1, wherein the first reflection body (7) comprises an installation face (9) for placing the light source (2), a first reflection face (A) provided on one side of the light source (2) and a second re^¬ flection face (B) provided on another side of the light source (2), and wherein the first and second reflection faces (A, B) are configured to reflect at least part of light on sides where they are located to the second reflector (8) .

3. The lighting apparatus according to claim 2, wherein the first reflection face (A) and the second reflection face (B) are asymmetrically arranged with respect to the light source

(2) .

4. The lighting apparatus according to claim 3, wherein the second reflection face (B) comprises a first reflection por- tion (Bl) and a second reflection portion (B2), and wherein the first reflection portion (Bl) and the second reflection portion (B2) are arranged with a predetermined angle therebe^¬ tween .

5. The lighting apparatus according to claim 4, wherein the first reflection body (7) further has an auxiliary reflection portion (C) configured to obtain a uniform light distribution and extending to a direction of the light source (2) starting from a place where the first reflection portion (Bl) and the second reflection portion (B2) come into contact with each other .

6. The lighting apparatus according to claim 5, wherein the auxiliary reflection portion (C) is designed to be a slope reflection body extending to the direction of the light source (2) and rising up gradually, and wherein the slope re^¬ flection body has a V shape that has a sharp end pointing to the light source (2) .

7. The lighting apparatus according to claim 6, wherein two side faces of the slope reflection body that has the V shape are designed to be concave arc faces.

8. The lighting apparatus according to claim 2, wherein the first reflection body (7) further comprises a third reflec^¬ tion face (D) configured to cut off light, and wherein the third reflection face (D) extends in a direction of a light axis of the light source (2) on the installation face (9) .

9. The lighting apparatus according to claim 8, wherein the third reflection face (D) intersects the first reflection face (A) and the second reflection portion (B2) .

10. The lighting apparatus according to any one of claims 2- 9, wherein the first reflection face (A) , the second reflec^¬ tion face (B) and the third reflection face (D) are designed to be arc faces, respectively.

11. The lighting apparatus according to any one of claims 2- 9, wherein the light sources (2) in the first reflector (6) on one side are provided on perpendicular bisectors of two neighboring light sources (2) in the first reflector (6) on the opposite side.

12. The lighting apparatus according to any one of claims 2- 9, wherein the second reflector (8) is a microstructure formed by a plurality of second reflection bodies (10) .

13. The lighting apparatus according to claim 12, wherein the second reflection bodies (10) are jointly arranged into a curved arch in a direction away from the light outlet (5) .

14. The lighting apparatus according to claim 12, wherein the second reflection body (10) has a cylindrical reflection face, a spherical reflection face, a triangular reflection face or a pyramidal reflection face.

15. The lighting apparatus according to claim 12, wherein the second reflector (8) is designed to be a mirror type re^¬ flector or a diffusive reflector.

16. A lighting system, wherein the lighting system is formed by a plurality of the lighting apparatus according to any one of the preceding claims.