CN103591551B - Light guides and lighting equipment - Google Patents

Abstract

The invention provides a kind of guiding device, comprise a light guide plate, and one be arranged at the reflecting element on this light guide plate, this light guide plate include an incidence surface, this incidence surface two opposition side exiting surface extended away from each other and a joint face, one connect this joint face and the reflecting surface of exiting surface, one be positioned at this enters, exiting surface has a common boundary the first connection limit, one be positioned at that this incidence surface has a common boundary with joint face second be connected limit, and one be positioned at that this joint face has a common boundary with reflecting surface the 3rd be connected limit, the 3rd connects limit is projected on this exiting surface and forms a projection line.Definition θ_TFor the angle of total reflection of this light guide plate, θ is the extension angle of this exiting surface and joint face,For the angle between this reflecting surface and exiting surface, d is the distance between this first and second connection limit, and L is the distance between this first connection limit and projection line,θ ＜ θ_T, L >=(d/2)/tan θ, thereby this light guide plate can adjust light quantity and go out light ratio.

Description

Light guides and lighting equipment

technical field

The invention relates to an optical component and an optical module, in particular to a light guide device and lighting equipment.

Background technique

In general exhibition halls, if you need to illuminate a long or large display area, you usually use long fluorescent lamps at the same time, or use multiple round lights to make the light sufficient. However, the use of fluorescent lamps tends to cause the light to be too scattered Insufficient brightness, and the use of multiple lamps is prone to the problem of overlapping lighting ranges in some areas and insufficient brightness in some areas, and the installation of multiple lamps will also increase the cost.

Generally speaking, in order to make the light emitted by the light source more uniform, it will be used with a light guide plate, and there are many related patents on the light guide plate, such as: US6328453, US6752507 patents are to form microstructures on the light guide plate to control the intensity of light Angle of light, or make the light of light more uniform. The design of the light guide plate in previous patent cases after searching is still mainly to carry out various microstructure processing and arrangement change design on the light guide plate. However, forming the microstructure will inevitably increase the manufacturing process of the light guide plate, which cannot reduce the manufacturing cost.

Contents of the invention

Therefore, the purpose of the present invention is to provide a light guide device capable of controlling the light field without passing through the microstructure.

To achieve the above object, the present invention provides the following technical solutions:

A light guide plate, comprising a light guide plate and a reflective element arranged on the light guide plate, wherein the light guide plate includes a light incident surface, a light exit surface connected to one side of the light incident surface, and a The other side of the light-incident surface is a connecting surface extending obliquely away from the light-emitting surface, a reflective surface connecting the connecting surface and the light-emitting surface, a first connecting edge located at the junction of the light-incident surface and the light-emitting surface, a A second connection edge located at the junction of the light incident surface and the connection surface, and a third connection edge located at the junction of the connection surface and the reflection surface. Wherein, the reflective element is arranged on the reflective surface, the light emitting surface and the connection surface extend to form a first included angle, the reflective surface and the light emitting surface form a second included angle, and the third connecting edge A projection line is formed by projecting on the light-emitting surface.

Define θ _T as the total reflection angle of the light guide plate, θ as the first included angle, is the second angle, d is the distance between the first and second connecting sides, L is the distance between the first connecting side and the projection line, and θ<θ _T , and L≥(d/2)/tanθ.

Another object of the present invention is to provide a lighting device used in conjunction with the aforementioned light guide device.

Therefore, the lighting equipment of the present invention includes a light source, a light guide plate for receiving light from the light source, and a reflective element arranged on the light guide plate, wherein the light guide plate includes a light incident surface, a A light emitting surface extending from one side of the surface, a connecting surface extending obliquely from the other side of the light incident surface to a direction away from the light emitting surface, a reflecting surface connecting the connecting surface and the light emitting surface, and a connecting surface located on the light incident surface A first connection side at the junction of the light-emitting surface, a second connection side at the junction of the light-incident surface and the connection surface, and a third connection side at the junction of the connection surface and the reflection surface. Wherein, the reflective element is arranged on the reflective surface, the light emitting surface and the connection surface extend to form a first included angle, the reflective surface and the light emitting surface form a second included angle, and the third connecting edge A projection line is formed by projecting on the light-emitting surface.

Define θ _T as the total reflection angle of the light guide plate, θ as the first included angle, is the second included angle, d is the distance between the first and second connecting sides, L is the distance between the first connecting side and the projection line, and θ<θ _T , and L≥(d/2)/tanθ.

The effect of the present invention is: through the parameter design of the light guide plate, the light emitted by the light source can be transformed into a surface light source with relatively uniform light after the light emitted by the light source passes through the light guide plate. The microstructure can reduce the production process and cost.

Description of drawings

Other features and effects of the present invention will be clearly presented in the implementation manner with reference to the drawings, wherein:

Fig. 1 is a perspective view of a lighting device disclosed in an embodiment of the present invention;

Fig. 2 is a side view of the light guide plate disclosed by the embodiment of the present invention;

Fig. 3 is a side view of a light guide plate disclosed by another embodiment of the present invention.

2 is lighting equipment; 21 is a light source; 211 is a light-emitting diode; 22 is a light guide plate; 221 is a light-incoming surface; 222 is a light-emitting surface; 223 is a connecting surface; Two connecting sides; 227 is the third connecting side; 228 is a projection line; 229 is a straight section; 220 is an inclined section; 23 is a reflection element; θ is a first included angle; is the second angle; d is the distance; L is the distance.

detailed description

Referring to Fig. 1 and Fig. 2, the preferred embodiment of the lighting device 2 of the present invention includes a light source 21, a light guide plate 22 for receiving light from the light source 21, and a reflective element 23 arranged on the light guide plate 22 . In this embodiment, the light source 21 includes a plurality of light emitting diodes 211 arranged at intervals, but it is not limited thereto.

The light guide plate 22 includes a light incident surface 221, a light exit surface 222 connected to one side of the light incident surface 221, and a connection extending obliquely from the other side of the light incident surface 221 to a direction away from the light exit surface 222. Surface 223, a reflective surface 224 connecting the connecting surface 223 and the light-emitting surface 222, a first connecting edge 225 located at the junction of the light-incident surface 221 and the light-emitting surface 222, a first connecting edge 225 located at the junction of the light-incident surface 221 and the connecting surface 223 The second connection side 226 at the junction, and a third connection side 227 at the junction of the connection surface 223 and the reflective surface 224 . Wherein, the reflective element 23 is arranged on the reflective surface 224, and a second included angle is formed between the reflective surface 224 and the light-emitting surface 222. The projection of the third connecting side 227 on the light emitting surface 222 forms a projection line 228 . As shown in FIG. 2 , the light emitting surface 222 and the connecting surface 223 extend to form a first angle θ.

Definition θ _T is the total reflection angle of the light guide plate 22, d is the distance between the first and second connecting sides 225, 226, L is the distance between the first connecting side 225 and the projection line 228, and θ<θ _T , and L≥(d/2)/tanθ. in, is a parameter used to control the angle of beam, L and θ are parameters used to control the width of beam, and the above three parameters can be used to control the output of the light guide plate 22. The amount of light (Flux).

The present invention utilizes two different materials to make the light guide plate 22, one is polycarbonate (Polycarbonate, PC) and the other is polymethylmethacrylate (Polymethylmethacrylate, PMMA). Table 2 contains the test results.

Table 1 Test data of light guide plate made of polymethyl methacrylate

Since the parameter conditions of the light guide plate 22 need to meet The three conditions of θ<θ _T , and L≥(d/2)/tanθ, according to the test results of group (1) in Table 1, meet θ<θ _T (11°<42.16°), and L≥(d/2)/tanθ(79mm>2.2mm), so the light output can reach more than 90%. Similarly, the experiment in group (2) also has the same result, and the experiment in group (3) can also make the light output close to 60%. Judging from the test results of groups (4) to (7), as long as any of the three conditions are not met, the amount of light emitted is significantly reduced to close to 50%, or even below 50%, and the amount of light output cannot be controlled. Effect.

Table 2 Test data of light guide plate made of polycarbonate

Similarly, Table 2 is tested with a light guide plate made of another material, and results similar to Table 1 can be obtained.

In addition, as shown in FIG. 3 , the connecting surface 223 of the light guide plate 22 may also have a straight section 229 connecting the light incident surface 221 and an inclined section connecting the straight section 229 and the reflecting surface 224. Section 220 , the straight section 229 and the light-emitting surface 222 are parallel to each other, and the first angle θ is formed by extending the inclined section 220 between the light-emitting surface 222 and the connecting surface 223 . Let the light guide plate 22 present another form, and the test results similar to those shown in Tables 1 and 2 can also be obtained.

To sum up, through the parameter design of the light guide plate 22, the lighting device 2 of the present invention can control the amount of light output and the light output ratio by changing the parameter conditions, and let the light emitted by the light source 21 that is originally distributed in a linear shape After passing through the light guide plate 22, it becomes a relatively uniform and planar light emitting area, which can provide a wide range of uniform light, so the purpose of the present invention can be achieved indeed.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. A light guide device comprising a light guide plate and a reflective element arranged on the light guide plate, wherein the light guide plate comprises: a light incident surface; a light exit surface connected to one side of the light entrance surface; a connection surface, extending obliquely from the other side of the light incident surface in a direction away from the light exit surface, the light exit surface and the connection surface extend to form a first included angle; a reflective surface, connecting the connection surface and the light-emitting surface, forming a second angle between the reflective surface and the light-emitting surface, and the reflective element is arranged on the reflective surface; a first connection edge located at the junction of the light incident surface and the light exit surface; a second connection edge located at the junction of the light incident surface and the connection surface; and a third connection side located at the junction of the connection surface and the reflective surface, and the third connection side is projected on the light-emitting surface to form a projection line; Wherein, θ _T is defined as the total reflection angle of the light guide plate, θ is the first included angle, is the second angle, d is the distance between the first connecting side and the second connecting side, L is the distance between the first connecting side and the projection line, and θ<θ _T , and L≥(d/2)/tanθ. 2. The light guide device according to claim 1, wherein the connection surface of the light guide plate has a straight section connecting the light incident surface, and an inclined section connecting the straight section and the reflective surface, the straight section The segment and the light-emitting surface are parallel to each other. 3. A lighting device, comprising: a light source, a light guide plate for receiving light from the light source, and a reflective element arranged on the light guide plate, wherein the light guide plate includes: a light incident surface; a light exit surface extending from one side of the light entrance surface; a connection surface, extending obliquely from the other side of the light incident surface in a direction away from the light exit surface, the light exit surface and the connection surface extend to form a first included angle; a reflective surface, connecting the connection surface and the light-emitting surface, forming a second angle between the reflective surface and the light-emitting surface, and the reflective element is arranged on the reflective surface; a first connection edge located at the junction of the light incident surface and the light exit surface; a second connection edge located at the junction of the light incident surface and the connection surface; and a third connection side located at the junction of the connection surface and the reflective surface, and the third connection side is projected on the light-emitting surface to form a projection line; Wherein, θ _T is defined as the total reflection angle of the light guide plate, θ is the first included angle, is the second angle, d is the distance between the first connecting side and the second connecting side, L is the distance between the first connecting side and the projection line, and θ<θ _T , and L≥d/(2tanθ). 4. The lighting device according to claim 3, wherein the connection surface of the light guide plate has a straight section connecting the light-incident surface, and an inclined section connecting the straight section and the reflective surface, and the straight section parallel to the light-emitting surface.