CN102565915A - Light guide body - Google Patents

Abstract

The invention discloses a light guide body. The light guide body comprises a light incident surface, a light emergent surface and a mesh point surface. The light incident surface has an average light incident direction. The light-emitting surface has an average light-emitting direction. The average light emitting direction is not parallel to the average light incident direction. The screen has a plurality of screens. The projection of the mesh point surface on the reference plane covers the projection of the light-emitting surface on the reference plane. The reference plane takes the average light emitting direction as a normal vector. The density of the mesh points distributed on the mesh point surface is larger as the distance from the light source is longer. The light guide body provided by the invention not only can achieve the effects of uniform light guide and attractive vision, but also can simplify the structure of the light guide body so as to improve the market competitiveness of the light guide body by increasing the distance between the light-emitting surface and the mesh point surface, distributing the mesh points by random numbers, enlarging the light-in surface and the like.

Description

light guide

technical field

The invention relates to a light guide body, in particular to a light guide body capable of achieving uniform light guide and visually pleasing effects by increasing the distance between the light-emitting surface and the dot surface and distributing the dots randomly.

Background technique

In recent years, with the continuous advancement of technology in the optical field, various light guide elements with different light guide functions have been developed in the market, which can be widely used in different fields (such as electronic products, architectural decoration, etc.).

Generally speaking, in addition to the necessary light guide, a traditional light guide element will additionally add a diffuser and a color filter. This is because the traditional light guide element usually uses the distribution of dots to achieve uniform light guide effect. If the light guide element does not use a diffuser to uniform the light, when the user sees the light guide element, the user will It will look directly at the dots, but cannot achieve a visually beautiful effect.

Therefore, in order to achieve the effect of uniform light guide, the traditional light guide element has to add an additional diffuser, but it also makes the structure of the entire light guide element more complicated, and its manufacturing cost is also significantly increased, which seriously affects its market. Competitiveness.

Contents of the invention

Therefore, the purpose of the present invention is to provide a light guide to solve the above-mentioned problems encountered in the prior art.

An object of the present invention is to provide a light guide. The light guide body includes a light incident surface, a light exit surface and a dot surface. The light incident surface has an average light incident direction. The light emitting surface has an average light emitting direction. The average light outgoing direction is not parallel to the average light incoming direction. The halftone mask has multiple halftones. The projection of the dot surface on the reference plane includes the projection of the light-emitting surface on the reference plane. The datum plane takes the average light-emitting direction as the normal vector. The distribution density of multiple dots on the dot surface is that the farther away from the light source, the greater the density.

In an embodiment of the present invention, the distance between the screen dot surface and the light-emitting surface is greater than 5 millimeters.

In an embodiment of the present invention, the width of the light incident surface is larger than that of the light exit surface, so as to increase the light receiving area of the light guide.

In an embodiment of the present invention, the sizes of the dots are the same.

In an embodiment of the present invention, the density of the plurality of dots distributed on the dot plane is linearly related to the distance from the light source.

In an embodiment of the present invention, the distribution density of these dots on the dot plane has a nonlinear relationship with the distance from the light source.

In an embodiment of the present invention, the light incident surface is a plane, and the average light incident direction is parallel to the normal vector of the light incident surface.

In an embodiment of the present invention, the light-emitting surface is a plane, and the average light-emitting direction is parallel to the normal vector of the light-emitting surface.

In an embodiment of the present invention, the light emitting surface is treated with matte surface.

Compared with the prior art, the light guide body proposed by the present invention can not only achieve uniform light guide and visual The beautiful effect can also simplify the structure of the light guide to enhance its market competitiveness.

The advantages and spirit of the present invention can be further understood by using the following detailed description of the invention and the accompanying drawings.

Description of drawings

Fig. 1 shows the schematic diagram of the light guide body of a preferred embodiment of the present invention;

Fig. 2 shows the schematic diagram that the projection of the dot surface on the reference plane covers the projection of the light-emitting surface on the reference plane;

Fig. 3 shows the front view of the light guide body utilizing both sides of the light-emitting diode;

Fig. 4A shows that there is a linear relationship between the dot distribution density in Fig. 3 and the distance between a plurality of dots and the light source;

Figure 4B shows that there is a nonlinear relationship between the network dot distribution density in Figure 3 and the distance between multiple network points and the light source;

FIG. 5A shows that there is a linear relationship between the dot distribution density of the light guide body incident on one side and the distance between multiple dots and the light source;

FIG. 5B shows that there is a non-linear relationship between the dot distribution density of the light guide body incident from one side and the distance between the dots and the light source.

Detailed ways

The invention discloses a light guide body. The light guide body can achieve the effect of light guide uniformity and visual beauty by increasing the distance between the light-emitting surface and the dot surface and randomly distributing the dots, so as to save the cost of additional diffusers and simplify the guide. The structure of the light body.

A preferred embodiment of the present invention is a light guide. In this embodiment, the light guide body is a light guide element having a light guide function, such as a light guide pipe, but not limited thereto. The light guide can be made of PC plastic or acrylic (such as polymethylmethacrylate (PMMA), but not limited thereto.

Please refer to FIG. 1 , which is a schematic diagram of the light guide body of this embodiment. As shown in FIG. 1 , the light guide 1 includes a light incident surface 10 , a light exit surface 12 and a dot surface 14 . The dot surface 14 has a plurality of dots P, and the dots P have the same size, but not limited thereto. In fact, the shape of the light guide body 1 can be determined according to the actual requirements of the product, and can be arc-shaped, straight-line or other different shapes.

In this embodiment, both the light-incident surface 10 and the light-exit surface 12 are planes, and have normal vectors NI and NO, respectively. But in fact, the light incident surface 10 and the light emitting surface 12 can also be non-planar (such as curved surfaces), and the light emitting surface 12 can be treated with a matte surface (such as sandblasting or oxidation) to produce a matte effect, but not limited thereto.

Firstly, the relative relationship among the light incident surface 10 , the light exit surface 12 and the dot surface 14 of the light guide body 1 will be described.

In this embodiment, the light guide 1 receives light from a light source (eg, LED, but not limited thereto) through the light incident surface 10 , and emits the light out of the light guide 1 through the light exit surface 12 . The light incident surface 10 has an average light incident direction DI, and the light exit surface 12 has an average light exit direction DO, and the average light exit direction DO and the average light incident direction DI are not parallel to each other. That is to say, the angle formed between the average light output direction DO of the light output surface 12 and the average light input direction DI of the light input surface 10 is not exactly 0 or 180 degrees. It should be noted that the average light incident direction DI of the light incident surface 10 refers to the average direction obtained by averaging the different directions of all the light incident on the light surface 10, while the average light exit direction DO of the light exit surface 12 refers to the The average direction obtained by averaging all the different directions of the light emitted from the light-emitting surface 12 .

If the average light incident direction DI of the light incident surface 10 and its normal vector NI are parallel to each other, and the average light exit direction DO of the light exit surface 12 and its normal vector NO are parallel to each other, it means that the normal vector NI of the light incident surface 10 and the normal vector of the light exit surface 12 NO are not parallel to each other.

In one embodiment, the average light output direction DO of the light output surface 12 and the average light input direction DI of the light input surface 10 are perpendicular to each other, that is, the average light output direction DO of the light output surface 12 and the average light input direction DI of the light input surface 10 are perpendicular to each other. The angle between them is 90 degrees, which means that the light incident surface 10 and the light exit surface 12 of the light guide body 1 are perpendicular to each other, but it is not limited thereto.

As for the relative relationship between the dot surface 14 and the light-emitting surface 12 of the light guide body 1, please refer to FIG. 1 and FIG. 2 at the same time. FIG. Schematic diagram of the projection. As shown in the figure, assuming that the reference plane S takes the average light-emitting direction DO of the light-emitting surface 12 as a normal vector, the projection PS of the dot plane 14 on the reference plane S will cover the projection PO of the light-emitting surface 12 on the reference plane S.

In addition, it should be noted that, in the light guide body 1, if the distance d between the dot surface 14 and the light exit surface 12 is too small, it will cause the user to look directly at the dot surface 14 through the light exit surface 12 of the light guide body 1. These outlets P. Therefore, in order to avoid the occurrence of the above-mentioned phenomenon, in practical applications, the distance d between the dot surface 14 of the light guide body 1 and the light-emitting surface 12 needs to be greater than 5 millimeters (mm), so that the dots P on the dot surface 14 can be seen in the user's vision. becomes rather inconspicuous. In a preferred embodiment, if the user's line of sight is at an angle (preferably at an angle of 45 degrees) to the average light-emitting direction DO of the light-emitting surface 12, the user will not see these dots P, so as to achieve visual beauty Effect.

Next, the distribution of the dots P produced on the dot surface 14 will be described in detail.

In this embodiment, the dots P can be made on the dot surface 14 of the light guide body 1 by printing, core etching, or core laser. The distribution patterns and shapes and sizes of the dots P can be determined according to the actual requirements of different light guides 1 , and there is no specific limitation.

It should be noted that an important feature of the light guide 1 of the present invention is that in the light guide 1, the distribution density of the dots P on the dot surface 14 is such that the farther away from the light source, the greater the density. Since the light emitted by the light source enters the light guide body 1 from the light incident surface 10 , the distribution density of the dots P on the dot surface 14 is that the farther away from the light incident surface 10 , the higher the density is.

Please refer to FIG. 3 . FIG. 3 is a top view of a light guide that utilizes light from both sides of the light-emitting diode. As shown in Figure 3, look toward the direction of dot surface 24 from light-exit surface 22, light-emitting diode LED1 and LED2 are respectively arranged on both sides X1 and X2 of light guide body 2, and the width of light-incidence surface 20 of light guide body 2 W1 is greater than the width W2 of the light-emitting surface 22, that is, the projection of the light-incident surface 20 on the aforementioned reference plane S is compared with the projection of the light-emitting surface 22 on the aforementioned reference plane S. The width W1 of the former is greater than the width W2 of the latter. To increase the light-receiving area of the light guide body 2 . As for the dot surface 24 , it is located behind the light-emitting surface 22 . In a preferred embodiment, these dots P are provided on the dot surface 24, and the distribution density of these dots P is as described above, and the distribution range of these dots P can only be distributed on the corresponding light-emitting surface 22 On the position, or the whole dot surface 24, not limited by any method.

In addition, as shown in Figure 3, there is a gap d' between the projection of the light-incident surface 20 on the aforementioned reference plane S and the projection of the light-emitting surface 22 on the aforementioned reference plane S. If d' is increased in design, it can be reduced. When the light-emitting diodes LED1 and LED2 enter light from the light-incident surfaces 20 on both sides and emit light from the light-emitting surface 22 , the user observes that both ends are too bright.

Because the dot distribution density on the dot surface is the farther away from the light source, the greater the density, and both sides X1 and X2 of the light guide 2 are provided with a light source, therefore, the dot surface 24 is located at the X1 and X1 on both sides of the light guide 2. The dot distribution density of X2 should be the minimum density value, while the dot distribution density of Xc located at the center of both sides of the light guide body 2 on the dot surface 24 should be the maximum density value. That is to say, the dot distribution density on the dot plane 24 decreases from the maximum density at the center Xc on both sides of the light guide body 2 to the minimum density values at X1 and X2 on both sides of the light guide body 2 respectively.

It should be noted that as long as the dot distribution density on the dot surface of the light guide can conform to the principle that the farther away from the light source, the greater the density, in fact, there is no specific restriction on the distribution position of each dot, and even a random number distribution can be adopted. way to configure the location of each network point distribution.

In a preferred embodiment, the dots on the dot plane of the light guide can only be distributed at the positions projected below the light-emitting surface to increase more light output, thereby reducing energy waste.

In practical applications, the corresponding relationship between the dot distribution density on the dot plane 24 in FIG. 3 and the distance of these dots from the light source may be a linear relationship or a nonlinear relationship. Please refer to Figure 4A and Figure 4B, Figure 4A shows that there is a linear relationship between the distribution density of the dots in Figure 3 and the distance between the multiple dots and the light source; Figure 4B shows the distribution density of the dots in Figure 3 and the distance between the multiple dots There is a non-linear relationship between the distance from the light source.

As shown in Figure 4A, the dot distribution density D on the dot surface 24 decreases from the maximum density value Dc at the center Xc on both sides of the light guide body 2 to both sides in a linear manner to X1 and X1 on both sides of the light guide body 2, respectively. Minimum density values D1 and D2 for X2.

As shown in Figure 4B, the dot distribution density D on the dot surface 24 decreases from the maximum density value Dc at the center Xc on both sides of the light guide body 2 to the two sides respectively to X1 on both sides of the light guide body 2 in a non-linear manner. and the minimum density values D1 and D2 of X2. In fact, the so-called non-linear method may be a curve generated by the method of least squares, but it is not limited thereto.

In practical applications, the light guide does not necessarily adopt the double-sided light incident method as shown in Figure 3, and may also adopt a single-sided light incident method (for example, remove the light-emitting diode LED2 in Figure 3). At this time, The corresponding relationship between the dot distribution density on the dot plane and the distance between these dots and the light source will become the situation shown in Figure 5A or Figure 5B, wherein Figure 5A shows the dots of the light guide body with single-side light input There is a linear relationship between the distribution density and the distance of multiple network points from the light source, and FIG. 5B shows that there is a nonlinear relationship between the distribution density of network points of the light guide body with single-side light input and the distance of multiple network points from the light source.

As shown in Figure 5A, the dot distribution density D increases linearly from the minimum density value D1' at the light incident side X1 of the light guide body to the maximum density value D2' at the non-light incident side X2 of the light guide body. As shown in Figure 5B, the dot distribution density D increases from the minimum density value D1' at the light-incident side X1 of the light guide body to the maximum density value D2' at the light-incident side X2 of the light guide body in a non-linear (such as a curve) manner.

Compared with the prior art, the light guide proposed by the present invention achieves uniform light guide and visual beauty by increasing the distance between the light-emitting surface and the dot surface, distributing the dots with random numbers, and enlarging the light-incoming surface. Therefore, the cost of additional diffusion sheets for the light guide can be saved, so as to enhance its market competitiveness.

With the above detailed description of the preferred embodiments, it is hoped that the features and spirit of the present invention can be described more clearly, rather than limiting the scope of the present invention by the preferred embodiments disclosed above. On the contrary, the intention is to cover various modifications and equivalent arrangements within the scope of the appended claims of the present invention.

Claims (11)

1. a light conductor is characterized in that, comprises:

Incidence surface has and on average goes into light direction;

Exiting surface has average light direction, and it is not parallel that above-mentioned average light direction and above-mentioned is on average gone into light direction; And

The site face has a plurality of sites, and above-mentioned site face contains the projection of above-mentioned exiting surface on the said reference plane in the projection on the reference plane, and the said reference plane is a normal vector with above-mentioned average light direction,

Wherein, the density that above-mentioned a plurality of sites distribute on the face of above-mentioned site is for far away from light source, and density is bigger.

2. light conductor according to claim 1 is characterized in that, the spacing of above-mentioned site face to above-mentioned exiting surface is greater than 5 millimeters.

3. light conductor according to claim 1 is characterized in that the width of above-mentioned incidence surface is greater than the width of above-mentioned exiting surface.

4. light conductor according to claim 1 is characterized in that, above-mentioned a plurality of sites big or small identical.

5. light conductor according to claim 1 is characterized in that, the density that above-mentioned a plurality of sites distribute on the face of above-mentioned site and above-mentioned a plurality of site are linear from the distance of above-mentioned light source.

6. light conductor according to claim 1 is characterized in that, the density that above-mentioned a plurality of sites distribute on the face of above-mentioned site and above-mentioned a plurality of site are nonlinear relationship from the distance of above-mentioned light source.

7. light conductor according to claim 1 is characterized in that, above-mentioned incidence surface is the plane.

8. light conductor according to claim 7 is characterized in that, above-mentioned on average to go into light direction parallel with the normal vector of above-mentioned incidence surface.

9. light conductor according to claim 1 is characterized in that, above-mentioned exiting surface is the plane.

10. light conductor according to claim 9 is characterized in that, above-mentioned average light direction is parallel with the normal vector of above-mentioned exiting surface.

11. light conductor according to claim 1 is characterized in that, above-mentioned exiting surface is handled through cloudy surface.

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