JP3092875U - Radiation type light guide plate - Google Patents

Abstract

(57) [Summary] [Problem] To make light rays on a light emitting surface of a light guide plate uniform and improve the brightness thereof by skillful designing means. SOLUTION: A light source, an upper surface portion is a light emitting surface, a bottom surface portion is a reflection surface, the light source is provided on a side portion, and stripes are provided.
The stripes are formed in a radiating shape radiating toward a side portion closer to the light source from an area far from the light source, a light guide plate, and shielding the side surface and the reflective surface of the light guide plate, and At least a reflecting member wrapped between itself and the light guide plate.

Description

[Detailed description of the device]

[0001]   The present invention relates to a radiant ray guide plate, especially for effectively converting a linear light source into a surface light source. Light that can be transmitted to a thin plate type light emitting device such as a liquid crystal display. Regarding the line guide plate.

[0002]

[Prior art]

  In the case of the conventional display, the light beam and the image are curved using the electron beam technology. Or it is generated in a plane range and is limited to the special requirements of the characteristics of the electron beam. As a result, the volume of the video tube of the display device becomes enormous, so that the new R & D Emphasis is placed on reducing the volume of D. The display devices for connecting LCDs have been actively developed, for example, the announcement of LCD TVs. Spare article layout that saves space in a confined living and work environment It is designed to provide space, and for example, in the generalization of portable computers. Therefore, its weight is greatly reduced, and its volume is light, thin, short and small. Outdoor devices such as the placement of electronic signboards are revolutionizing in weight and volume, so the visual With the beautification of quality, it is becoming more and more changing. This has been achieved by the miniaturization of the flannel, of which the light guide plate uses a light source. Is in charge of the effective conversion. How to use the characteristics of light rays Proposal of light rays is to give sufficient and uniform brightness to each area of the guide plate. It is a point to improve the structure of the inner plate.

[0003]   In the case of the conventional light guide plate, as shown in FIGS. 1 and 2, the light source 1a and the light guide plate are used. 2a and the reflecting member 3a, the upper part of the light guide plate 2a becomes the light emitting surface 20a. , The bottom surface of the light guide plate 20a becomes the reflection surface 21a, and The first side portion 22a, the second side portion 23a, the third side portion 24a, and the fourth side portion which are sequentially adjacent to each other. The side surface 25a is provided, and stripes 26a are formed on the reflection surface 21a. 26a is parallel to the first side part 22a, the light source 1a is arranged on the first side part 22a, Moreover, the reflecting member 3a includes the second side portion 23a, the third side portion 24a, and the fourth side portion 25a. The reflecting surface 21a is shielded, and the light source 1a is connected to the reflecting member 3a and the light guide plate 2a. Wrap it so that it is interposed between them.

[0004]   As shown in FIG. 3, the stripes 26a on the reflecting surface 21a of the light guide plate 2a are respectively the first stripes 26a. An L-shaped light source is used as the light source 1a in parallel with the side portion 22a and the second side portion 23a. And disposed on the first side edge 22a and the second side edge 23a, the first side edge 22a And the second side portion 23a intersects with the first end point 27a, and the third side portion 24a. The intersection of the fourth side portion 25a with the third side point 28a.

[0005]   The above-mentioned conventional light guide plate structure is constructed by a light source as shown in FIGS. 1 and 2. Enters from the first side, and is emitted to the light emitting surface by the reflection of stripes on the reflecting surface. Since the light source is arranged on the first side portion, the first side portion is significantly brightened, On the other hand, the third side part becomes darker, and as shown in FIG. Since it is arranged on the side part and the second side part, the range of the light emitting surface near the first end point is large. The width becomes brighter, while the area of the ray emitting surface near the third end point becomes darker. Moreover, the light rays on the light emitting surface are also non-uniform.

[0006]

[Problems to be solved by the device]

  The main purpose of the present invention is to make the light rays on the light emitting surface of the light guide plate uniform and To provide a radiant ray guide plate with improved brightness.

[0007]

[Means for Solving the Problems]

  In order to achieve the above-mentioned purpose, the present invention provides a light source, a top surface as a light emitting surface, and a bottom surface. Is a reflective surface, the light source is provided on the side, and there are stripes, which are far from the light source. A ray guide plate that is formed in a radiant shape that radiates toward the side closer to the light source than , The side surface of the light guide plate and the reflection surface are shielded and the light source is A radiant ray guide plate having at least a reflection member wrapped between the line guide plate is provided. To serve.

[0008]   Hereinafter, preferred embodiments of the present invention will be described in detail and concretely with reference to the accompanying drawings. It should be noted that the specific structures shown in the drawings and the description are merely an implementation of the present invention. It is merely a form and does not narrowly limit the scope of the claims of the present invention.

[0009]

[Embodiment of device]

  As shown in FIG. 4, FIG. 5, FIG. 5A and FIG. , A light source 1, a light guide plate 2, and a reflecting member 4, of which the light source 1 is L-shaped A light source is adopted and a light beam is emitted from the light source 1.

[0010]   The upper part of the light guide plate 2 becomes the light emitting surface 20, and the bottom face of the light guide plate 2 The portion becomes the reflection surface 21, and the first side edge is arranged so as to be sequentially adjacent to the peripheral portion of the light guide plate 2. The portion 22, the second side portion 23, the third side portion 24, and the fourth side portion 25 are in contact with each other, and The intersection of the one side portion 22 and the second side portion 23 becomes the first end point 26, and the second side portion The intersection of 23 and the third side part 24 becomes the second end point 27, and the third side part 24 and the fourth side part 24. The intersection with the side portion 25 becomes the third end point 28, and the fourth side portion 25 and the first side portion 2 The intersection with 2 becomes the fourth end point 29, and the light source 1 has the first side part 22 and the second side part 23. And has a stripe 30 on the reflection surface 21, and the stripe 30 is a fourth area in the area far from the light source 1. The first side 22 and the second side of the area closer to the light source 1 than the side 25 and the third side 24 Each of the stripes 30 is set so as to form a radial pattern toward the side portion 23. The portion between them forms a light path 31, and the starting point of the stripe 30 is the fourth side portion 25 and the third side portion. 24, the closer it is to the third end point 28, the closer the distance is, and The gap gradually increases toward the four end points 29 and the second end point 27. The end points of the stripes 30 are located at the first side edge portion 22 and the second side edge portion 23, and at the first end point 26. The closer the distance is, the wider the distance becomes, and the more the distance is toward the fourth end point 29 and the second end point 27. Then, the gap is gradually reduced, and the width of the light path 31 is reduced to the first side portion 22. And gradually narrows from the second side part 23 toward the fourth side part 25 and the third side part 24. That is, the closer to the first end point 26, the larger the gap of the stripe 30 becomes. The fringe 30 close to the third end point 28 becomes tighter, and the ray is emitted. Stripes 30 corresponding to the reflecting surface 21 are also formed on the surface 20.

[0011]   The reflecting member 4 shields the third side portion 24, the fourth side portion 25, and the reflecting surface 21 that are far from the light source 1. The light source 1 is shielded, and the light source 1 is interposed between the reflection member 4 and the light guide plate 2. And reflect light rays.

[0012]   The light beam emitted from the light source 1 is guided from the first side portion 22 and the second side portion 23 by the light guide plate. 2 and is emitted to the light emitting surface 20 via the reflection of the stripes 30 on the reflecting surface 21, Since 30 are formed so as to be distributed in a radiative manner, they are close to the first end point 26 of the light source 1. The gap between the stripes 30 becomes large, and the width of the ray path 31 becomes large. The number of reflected light rays in the area of the light guide plate 2 is reduced, so that it is close to the light source 1 but is significantly brighter. Since the stripes 30 do not form parallel or perpendicular to the light source 1, The radial inclination setting causes the light rays to be transmitted and reflected to the third end point 28 which is far from the light source 1, and the third end point. The stripes 30 close to 28 become dense and the rays are effectively transmitted to the third end point 28. Therefore, its brightness and uniformity increase.

[0013]   As shown in FIG. 7, the stripe 30 is closer to the light source 1 than the third side portion 24 of the area far from the light source 1. Since it is set so as to form a radiant shape on the first side portion 22 close to Due to the distribution of the stripes 30 in the vicinity of the portion 22, the spacing is increased and the light reflection is reduced. In addition, since the distribution of the stripes 30 becomes close in the vicinity of the third side part 24, It can be effectively transmitted to the three side portions 24, and its brightness and uniformity can be improved.

[0014]   As shown in FIG. 8, the stripe 30 is an intermediate area of the light guide plate 2 in an area far from the light source 1. Radiation toward the first side part 22 and the third side part 24 closer to the light source 1 The stripes 30 near the first side edge 22 and the third side edge 24. Since the gap between the two becomes large, the light ray reflection is reduced, and the intermediate area of the light guide plate 2 is reduced. Since the stripes 30 have a close distribution, the light rays can be effectively transmitted, and their brightness and level are even. One can be improved.

[0015]

[Effect of device]   As described above, in the case of the radiation ray guide plate of the present invention, at least the following It has such excellent points.

[0016]   That is, since the stripes are set so as to radiate, the light guide plate far from the light source. Increase the brightness of the range in, and the brightness of the range in the ray guide plate close to the light source And the brightness of the rays emitted from the entire ray guide plate is made uniform. It

[Brief description of drawings]

FIG. 1 is a plan view showing a structure of a conventional light guide plate.

FIG. 2 is a side sectional view showing a conventional light guide plate structure.

FIG. 3 is a plan view showing the structure of another conventional ray guide plate.

FIG. 4 is a perspective view showing a light guide plate of the present invention.

FIG. 5 is a plan view showing the structure of the light guide plate according to the first embodiment of the present invention.

5A is an enlarged view showing a portion A in FIG. 5. FIG.

FIG. 6 is a partial cross-sectional view showing the structure of the light guide plate of the present invention.

FIG. 7 is a plan view showing the structure of a light guide plate according to a second embodiment of the present invention.

FIG. 8 is a plan view showing a structure of a light guide plate according to a third embodiment of the present invention.

[Explanation of symbols]

1 light source 2 Ray guide plate 4 Reflective member 20 Ray emission surface 21 reflective surface 22 First side 23 Second side 24 Third side 25 Fourth side 26 First end point 27 Second endpoint 28 Third endpoint 29 Fourth endpoint 30 stripes 31 ray passage

Claims (3)

[Scope of utility model registration request] 1. A light source, a light emitting surface on a top surface, a reflecting surface on a bottom surface, the light source provided on a side portion, and stripes, and the side surface closer to the light source than the area far from the light source. A ray guide plate that is formed in a radiation shape that radiates toward a portion, shields the side portion of the ray guide plate and the reflection surface, and wraps the light source between itself and the ray guide plate; A radiant ray guide plate comprising at least a member. 2. The light guide plate has a first side part, a second side part, a third side part and a fourth side part which are sequentially adjacent to each other on the peripheral part of the light guide plate. The intersection of the portion and the second side portion is the first end point, and the intersection of the second side portion and the third side portion is the second end point, and the third side portion and the A light source in which the intersection with the fourth side portion is the third end point, the intersection between the fourth side portion and the first side portion is the fourth end point, and the light source is L-shaped. Adopted, arranged on the first side portion and the second side portion of the light guide plate, the starting point of the stripe is located on the fourth side portion and the third side portion of the area far from the light source, The closer it is to the three end points, the closer the distance is, and the gap is being expanded toward the fourth end point and the second end point one after another, and the end point of the stripe is the first side part and the Second side 2. The distance between the first end point and the first end point is increasing, and the distance between the fourth end point and the second end point is decreasing, and the gap is decreasing toward the fourth end point and the second end point. The radiant ray guide plate described in. 3. The radiant ray guide plate according to claim 1, wherein a ray path is formed between the stripes.