JP2005285702A - Translucent member and lighting system using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a translucent member that enables incident light to be scattered in all directions, thus eliminates dark areas, enables the use of the otherwise dark areas, and, as a result, is reduced in size. <P>SOLUTION: In the translucent member 3 having a translucent member body 3A configured to cause a light exit surface 6 and a light incident surface 2 to cross each other, a number of polygonal-pyramid shaped protrusions 12 protruding from the light incident surface 2 are provided on the light incident surface 2 as light diffusing means for three-dimensionally diffusing the incident light toward the interior of the translucent member body 2A. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lighting device, and is used in, for example, a mobile phone, a portable information device, a personal computer, and a liquid crystal television receiver. The present invention relates to a light guide member used in a backlight device or the like that is an illumination device of a liquid crystal display device, and an illumination device using the same.

  This type of light guide member guides and diffuses light from a fluorescent tube or LED as a light source disposed along the light incident surface, and uniformly emits light from a light emitting surface of a large area. Therefore, it is widely used as a surface light source of a surface-type illuminator that uniformly illuminates a wide display surface, and has recently been widely used as a backlight device for liquid crystal display devices as well as advertising lamps.

  Recently, in order to narrow the frame of a liquid crystal display device, as shown in FIG. 13, one end or both ends of a light incident surface 22 of a light guide member 21 by shortening the entire length of a cold cathode tube 20 which is a kind of fluorescent tube. The electrode part 20A of the cold-cathode tube 20 is in a state of being inserted into. In the present invention, a fluorescent tube other than the cold cathode tube may be used.

  Therefore, no matter how the density of the white printing dots, the sliver dots, the prism dots, or the irregularities on the reflection surface 23 is adjusted, one end of the light incident surface 22 on the electrode portion 20A side or near both ends as shown by hatching in FIG. Has become dark and the high uniformity, which is the required luminance unevenness of the light-emitting screen, cannot be achieved. In FIG. 13, a dark portion near the end of the light incident surface 22 is indicated by 24 hatching.

  Therefore, the light guide member shown in FIG. 14 is used for the purpose of achieving both the optical use of the light guide member without waste and the narrowing of the frame and the screen having high luminance, high uniformity, and luminance unevenness contrary to this. And the illuminating device using the same is proposed.

  This conventional light guide member 30 has a light emitting surface 31 on its front surface, a reflective surface on its back surface, a light incident surface 33 on its one side surface, and reflection side end surfaces 34, 35 on the other surface. 36. Light scattering means for enhancing light scattering is formed on the light incident surface 33 in the direction parallel to the plane of the light emitting surface 31 out of the light incident inside from the light incident surface 33. The light incident from the light source 37 is scattered by the light scattering means and emitted from the light exit surface 31.

  In this case, the light scattering means is formed only on the light incident surface 33, and the light emitting surface 31, the reflecting surface 32, and the reflection side end surfaces 34, 35, and 36 are flat surfaces. The light scattering means formed on the light incident surface 33 of the light guide member 30 positively transmits the light incident on the light incident surface 33 in a direction parallel to the light emitting surface 31 as compared with the case where the light incident surface 33 is flat. 14, the light scattering means has the triangular strips 38 and the concave strips 39 along the thickness direction of the light guide member 30 in FIG. 14 in the width direction of the light guide member 30. It is composed of repetitively formed vertical stripe-shaped prisms. Reference numeral 40 denotes a sheet made of a prism sheet for controlling the directivity of light or a sheet for diffusing light, and a display panel such as a liquid crystal panel is disposed on the sheet. (For example, refer to Patent Document 1).

JP-A-9-113907

  However, in the conventional light guide member 30 described above, the light scattering means provided on the light incident surface 33 has a triangular cross section when the thickness direction of the light guide member 30 is cut parallel to the output surface 31. It forms a vertical stripe-shaped prism in which convex ridges 38 and concave ridges 39 are repeatedly formed in the width direction of the light guide member 30, and is incident on the light incident surface 33 as compared with the case where the light incident surface 33 is flat. Since the light is actively diffused in the direction parallel to the light emitting surface 31, the light in the thickness direction of the light guide member 30 is not efficiently used, and the light mainly travels straight. The upper and lower sides of the light guide member in the vicinity of the light source become dark at hand, and the darkness at the light source hand cannot be used as a part for illuminating this part, thus preventing the light guide member 30 from being downsized.

  In addition, as a conventional lighting device, there is one that uses a plurality of light emitting diodes LED as a light source, but due to the light diffusion or light distribution characteristics of the light emitting diode LED and the difference in refractive index between air and the light guiding member, Since the incident light does not spread so much, the area between the adjacent light emitting diode LED and the light emitting diode LED and the side surface of the light emitting diode LED and the light guide member 30 and the vicinity of the side surface until the incident light sufficiently spreads. At the same time, the area that cannot be covered by the incident angle in the vertical direction also does not hit the prism, and no light is emitted, so that the area becomes a dark area like the dark part 24 in FIG. Since this dark area portion cannot be used to illuminate the liquid crystal panel, there is a problem in that miniaturization of the light guide member 30 is prevented. It was.

  The present invention has been made in order to improve the above-described conventional problems. The first object of the present invention is to allow the incident light to be diffused in all directions, so that the dark portion 24 in FIG. An object of the present invention is to provide a light guide member that can be reduced in size by eliminating the dark region portion and making the portion that was the dark region portion usable.

  In addition, the second object of the present invention is to allow the diffusion of incident light in all directions, particularly in the thickness direction of the light guide plate, and eliminate the dark region portion. It is possible to provide a lighting device that can be reduced in size.

  In order to achieve the first object, a light guide member according to the present invention includes a light guide member body having a configuration in which an exit surface for emitting light and a light incident surface for entering light intersect each other. In the optical member, light diffusing means for diffusing the incident light in a three-dimensional manner toward the inside of the light guide member main body is provided on the light incident surface.

  With this configuration, by providing a light diffusing unit that diffuses light three-dimensionally on the light incident surface, it is possible to diffuse incident light in all directions, not to mention the diffusion of incident light in the horizontal and vertical directions. .

  For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. Since the component of normal incidence from the light source that has been wasted to the light guide member body can be angled in the vertical direction by the light diffusing means, it is possible to use this component of normal incidence and light efficiency. Can lead to an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, and the light guide member can be downsized.

  In the light guide member according to the present invention, in the light guide member according to the present invention described above, the light diffusing means is composed of a large number of polygonal pyramid-shaped convex portions protruding from the light incident surface.

  With this configuration, by providing a large number of polygonal pyramid-shaped convex portions on the light incident surface, it is possible to diffuse the incident light in all directions, not to mention the diffusion in the horizontal and vertical directions.

  For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. The component of normal incidence from the light source that was previously wasted to the light guide member body can be angled in the vertical direction by a large number of polygonal pyramid-shaped convex parts, so it is possible to use this component of normal incidence This leads to an increase in light efficiency and an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, and the light guide member can be downsized.

  The light guide member according to the present invention is the light guide member according to the present invention described above, wherein the light diffusing means is configured by a number of conical convex portions protruding from the light incident surface.

  With this configuration, by providing a large number of conical convex portions on the light incident surface, it is possible to diffuse the incident light in all directions, not to mention the diffusion of the incident light in the horizontal and vertical directions.

  For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. The component of normal incidence from the light source that has been wasted in the past to the light guide member body can be angled in the vertical direction by a large number of conical projections, making it possible to use this component of normal incidence This leads to an increase in light efficiency and an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, and the light guide member can be downsized.

  Further, the light guide member according to the present invention is the light guide member according to the present invention described above, wherein the light diffusion means has a number of polygonal pyramid-shaped recesses that taper from the light incident surface toward the inside of the light guide member body. It is.

  With this configuration, by providing many polygonal pyramid-shaped concave portions on the light incident surface, it is possible to diffuse the incident light in all directions, not to mention the diffusion of the incident light in the horizontal and vertical directions.

  For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. The component of normal incidence from the light source that has been wasted in the past to the light guide member body can be angled in the vertical direction by a large number of polygonal pyramid-shaped recesses, so that it is possible to use this component of normal incidence This leads to an increase in light efficiency and an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, and the light guide member can be downsized.

  The light guide member according to the present invention is the light guide member according to the present invention described above, wherein the light diffusing means is a plurality of conical recesses that taper from the light incident surface toward the inside of the light guide member body. It is configured.

  With this configuration, by providing a large number of conical recesses on the light incident surface, it is possible to diffuse the incident light in all directions, not to mention the diffusion of the incident light in the horizontal and vertical directions.

For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. The component of normal incidence from the light source that has been wasted in the past to the light guide member body can be angled in the vertical direction by a large number of conical pyramid-shaped recesses, so it is possible to use this component of normal incidence This leads to an increase in light efficiency and an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, and the light guide member can be downsized.

  In the light guide member according to the present invention, the polygonal pyramid shape is a quadrangular pyramid.

  With this configuration, since the convex portion (concave portion) has a quadrangular pyramid shape, it is possible to diffuse the incident light in all directions, not to mention the diffusion of the incident light in the horizontal direction and the vertical direction.

  For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. Since the component of the normal incidence from the light source that has been wasted in the past to the light guide member body can be angled in the vertical direction by the convex portion (concave portion) of the quadrilateral thrust shape, it is possible to use this normal incidence component. This can lead to an increase in light efficiency and an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, and the light guide member can be downsized.

  The light guide member according to the present invention is arranged such that one surface of the quadrangular pyramid faces the light exit surface in the light guide member according to the present invention described above.

  With such a configuration, light can be strongly diffused in the thickness (upward direction) of the light guide member main body near the light source, and the hand becomes particularly bright.

  In order to achieve the second object of the present invention described above, the illumination device according to the present invention includes a light guide member having a configuration in which an exit surface for emitting light and a light incident surface for incident light intersect each other. In a lighting device having a light source disposed on a light incident surface side, a light diffusing means for three-dimensionally diffusing incident light from the light source toward the inside of the light guide member on the light incident surface of the light guide member Is provided.

  With this configuration, by providing a light diffusing unit that diffuses light three-dimensionally on the light incident surface, it is possible to diffuse incident light in all directions, not to mention the diffusion of incident light in the horizontal and vertical directions. .

  For this reason, in addition to being able to shorten the run-up distance until the light incident on the light guide member is emitted, it is possible to increase the overall luminance. The component of normal incidence from the light source that has been wasted to the light guide member can be angled in the vertical direction by the light diffusing means, so that the component of normal incidence can be used and light efficiency can be improved. This can lead to an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, the light guide member can be miniaturized, and the lighting device can be miniaturized.

  Moreover, the illuminating device which concerns on this invention is comprised in the above-mentioned illuminating device which concerns on this invention in which the light-diffusion means is comprised of the many polygonal pyramid-shaped convex parts which protrude from a light-incidence surface.

  With this configuration, by providing a large number of polygonal pyramid-shaped convex portions on the light incident surface, it is possible to diffuse the incident light in all directions, not to mention the diffusion in the horizontal and vertical directions.

For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. The component of normal incidence from the light source that was previously wasted to the light guide member body can be angled in the vertical direction by a large number of polygonal pyramid-shaped convex parts, so it is possible to use this component of normal incidence This leads to an increase in light efficiency and an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, the light guide member can be miniaturized, and the lighting device can be miniaturized.
The illumination device according to the present invention is the illumination device according to the present invention described above, wherein the light diffusing means is composed of a number of conical convex portions protruding from the light incident surface.

  With this configuration, by providing a large number of conical convex portions on the light incident surface, it is possible to diffuse the incident light in all directions, not to mention the diffusion of the incident light in the horizontal and vertical directions.

  For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. The component of normal incidence from the light source that has been wasted in the past to the light guide member body can be angled in the vertical direction by a large number of conical projections, making it possible to use this component of normal incidence This leads to an increase in light efficiency and an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, the light guide member can be miniaturized, and the lighting device can be miniaturized.

  Further, the illumination device according to the present invention is the illumination device according to the present invention described above, wherein the light diffusing unit has a plurality of polygonal pyramid shapes in which the light diffusing unit tapers from the light incident surface toward the inside of the light guide member. It is a recessed part.

  With this configuration, by providing many polygonal pyramid-shaped concave portions on the light incident surface, it is possible to diffuse the incident light in all directions, not to mention the diffusion of the incident light in the horizontal and vertical directions.

  For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. The component of normal incidence from the light source that has been wasted in the past to the light guide member body can be angled in the vertical direction by a large number of polygonal pyramid-shaped recesses, so that it is possible to use this component of normal incidence This leads to an increase in light efficiency and an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, the light guide member can be miniaturized, and the lighting device can be miniaturized.

  Further, the illumination device according to the present invention is the illumination device according to the present invention described above, wherein the light diffusing means for three-dimensionally diffusing light has a large number of cones that taper from the light incident surface toward the inside of the light guide member body. It is composed of a concave portion having a shape.

  With this configuration, by providing a large number of conical recesses on the light incident surface, it is possible to diffuse the incident light in all directions, not to mention the diffusion of the incident light in the horizontal and vertical directions.

  For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. The component of normal incidence from the light source that has been wasted in the past to the light guide member body can be angled in the vertical direction by a large number of conical pyramid-shaped recesses, so it is possible to use this component of normal incidence This leads to an increase in light efficiency and an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, the light guide member can be miniaturized, and the lighting device can be miniaturized.

  The lighting device according to the present invention is the above-described lighting device according to the present invention, wherein the polygonal pyramid shape is a quadrangular pyramid.

With this configuration, since the convex portion (concave portion) has a quadrangular pyramid shape, it is possible to diffuse the incident light in all directions, not to mention the diffusion of the incident light in the horizontal direction and the vertical direction.

  For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. Since the component of the normal incidence from the light source that has been wasted in the past to the light guide member body can be angled in the vertical direction by the convex portion (concave portion) of the quadrilateral thrust shape, it is possible to use this normal incidence component. This can lead to an increase in light efficiency and an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, the light guide member can be miniaturized, and the lighting device can be miniaturized.

  Moreover, the illumination device according to the present invention is arranged such that one surface of the quadrangular pyramid faces the emission surface in the illumination device according to the present invention described above.

With such a configuration, light can be strongly diffused in the thickness (upward direction) of the light guide member main body near the light source, and the hand becomes particularly bright.

  According to the light guide member of the present invention, it is possible to diffuse the incident light in all directions and in the thickness direction of the light guide plate, not to mention the diffusion of the incident light in the horizontal direction and the vertical direction. For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. Since the component of normal incidence from the light source to the light guide member body is angled in the vertical direction by the light diffusing means, it becomes possible to use this component of normal incidence, leading to an increase in light efficiency and the screen. An increase in brightness can be brought about. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, and the light guide member can be downsized.

Moreover, according to the illuminating device which concerns on this invention, it cannot be overemphasized that incident light is spread | diffused in the horizontal direction of a light-guide plate, and a perpendicular direction, but the spreading | diffusion of all directions of an incident light is attained. For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. Since the component of normal incidence from the light source that has been wasted to the light guide member body can be angled in the vertical direction by the light diffusing means, it is possible to use this component of normal incidence and light efficiency. Can lead to an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, the light guide member can be miniaturized, and the lighting device can be miniaturized.

In order to achieve the first object, a light guide member according to the present invention includes a light guide member body having a configuration in which an exit surface for emitting light and a light incident surface for entering light intersect each other. In the light member, the light incident surface is provided with a plurality of polygonal pyramid-shaped convex portions protruding from the light incident surface for three-dimensionally diffusing incident light toward the inside of the light guide member body. It is a thing.
With this configuration, by providing light diffusing means for diffusing light three-dimensionally on the light incident surface, it is possible to diffuse incident light in all directions, not to mention diffusion in the horizontal and vertical directions. .
For this reason, in addition to shortening the running distance until the light incident on the light guide member main body is emitted, it is possible to increase the overall luminance. The normal incidence component from the light source to the light guide member body where the loss or attenuation is high and the utilization efficiency is poor in the conventional light guide plate is angled in the vertical direction by the light diffusion means. It is possible to use the above components, leading to an increase in light efficiency and an increase in screen brightness. For this reason, the dark region portion is eliminated, the portion that was the dark region portion can be used, and the light guide member can be downsized.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  Embodiment 1 of the present invention is shown in FIGS. FIG. 1 is a perspective view with a part omitted of the illumination device of the present invention, FIG. 2 is a side view with a part omitted, FIG. 3 is a front view with a part omitted, and FIG. It is an enlarged view of the A section.

  As shown in FIG. 1, the illumination device 1 using the light guide member 3 includes a plate-like light guide member 3 for guiding light introduced from the light incident surface 2, a light source 4, and a light guide member. The reflecting surface or reflecting plate 5 is provided with a reflecting function on the lower surface.

  The light guide member 3 includes a light guide member main body 3A formed of a transparent resin having a large refractive index, such as polycarbonate resin or methacrylic resin. The surface of the light guide member main body 3A is a light emitting surface 6. The back surface is the reflecting surface 7, the one side end surface is the light incident surface 2, and the other surfaces are the reflection side end surfaces 8, 9, 10, and the light exit surface 6 intersects the light incident surface 2. doing. As shown in FIG. 2, a reflective pattern and a diffusion pattern 11 are formed on the reflective surface 7 by patterning application of paint and uneven processing. When the reflecting surface 7 is present, the reflecting plate 5 may not be provided.

  The light incident surface 2 of the light guide member main body 3A is formed with a large number of quadrangular pyramid-shaped convex portions (pyramid prisms) 12 as light diffusing means for diffusing light in three dimensions. These quadrangular pyramid-shaped convex portions 12 have four inclined surface portions 12A, 12B, 12C, and 12D (see FIG. 2) as shown in FIG. 4, and one set of inclined surface portions 12A facing each other, 12C and the other set of inclined surface portions 12B and 12D facing each other are orthogonal to each other.

  Then, the quadrangular pyramid-shaped convex portion 12 faces the one opposing pair of inclined surface portions 12A and 12C in the width direction (horizontal direction) of the light guide member 3 (the reflection side end surface 8 and the reflection side end surface 8). The other side of the inclined surface portions 12B and 12D in the thickness direction (vertical direction) of the light guide member 3 (the direction of the light emitting surface 6 and the reflecting surface 7 on the back surface thereof). ) Then, as shown in FIG. 3, the quadrangular pyramid-shaped convex portions 12 are linearly arranged in the thickness direction and the width direction of the light guide member 3. This arrangement may be arranged in a staggered manner, or may be arranged only in a partial region of the incident surface.

Further, the arrangement of the convex portions 12 will be described.
In the figures shown in the examples so far, for example, pyramid shapes of the same size have been neatly arranged at the same interval, but even if there is a flat surface between adjacent convex parts and convex parts. Good but not necessary. The portion of the flat surface is normally incident without any effect such as diffusion, and is diffused at a portion of the prism, so that the proportion of the light incident on the light guide member can also be adjusted by this ratio. The location of the convex or concave portions may be arranged on the entire light incident side surface of the LED, but it may be arranged only in front of the LED light source, or the highest density in front of the LED. You can put it on. In addition to arranging a number of steps in a straight line, a staggered arrangement, a delta arrangement, or a circular arrangement with the center of the LED light source as an axis may be used.
This is true for both convex and concave portions. This is also true in the following embodiments of the present invention.

In addition, the arrangement of the rhombus by rotating the quadrangular pyramid of the convex portion 45 by 45 ° is shown in the figure.
It can be freely set in accordance with the setting in which direction the diffusion is strengthened in the range of 0 ° to 90 °, not just rotating. Further, the rotation of the polygonal pyramids such as the triangular pyramids and the quadrangular pyramids of all the convex portions or concave portions may be changed. In other words, not all rotation angles need to be the same, and the center of the LED is diffused strongly in the vertical and horizontal directions, but as it moves away from the center, the shape is rotated to increase the diffusion in an oblique direction. Also good.
This is true for both convex and concave portions. This is also true in the following embodiments of the present invention. However, there is no change caused by rotating the convex and concave portions of the cone.

As for the shape of the convex portion 12, the size of the convex portion or the concave portion of the incident surface of the light guide member is arbitrary. It doesn't matter if it is large, but it is better if it is small. It is sufficient if it can be cut as a mold. For example, the diameter of the bottom of the cone is preferably 2 μm to 10 μm, but may be on the order of about 100 μm.
By changing the angle of the apex angle of the quadrangular pyramid, pyramid, and cone, it is possible to independently control how the parallel direction (left and right) and vertical direction (up and down) spread. It may be a regular quadrangular pyramid or cone, a quadrangular pyramid or an elliptical pyramid. The shapes need not all be the same, and may be a quadrangular pyramid or a cone depending on the part, or may be combined.
This is true for both convex and concave portions. This is also true in the following embodiments of the present invention.

  The light source 4 includes a plurality of (three) light emitting diodes LED1, LED2, and LED3 mounted on a circuit board (not shown), for example, a flexible circuit board (FPC), and the light emitting diodes LED1, LED2 The LED 3 is disposed to face the light incident surface 2.

  Moreover, the reflecting plate 5 is formed of, for example, a white resin sheet having a high reflectance, and both side portions are attached to the back surface of the light guide member 3 by a double-sided tape (not shown).

  As shown in FIG. 2, when the light emitted from each of the light emitting diodes LED 1, LED 2, LED 3 of the light source 4 and entering the light guide member 3 from the light incident surface 2 enters the convex portion 12 having a quadrangular pyramid shape. Light diffuses or travels in the light guide plate in a direction corresponding to the inclined surface portions 12A, 12B, 12C, and 12D of the convex portion 12, for example, diffuses in the vertical and horizontal directions.

  That is, incident light is diffused in the horizontal direction by one set of inclined surface portions 12A and 12C of the quadrangular pyramid-shaped convex portion 12, and incident light is diffused in the vertical direction by the other set of inclined surface portions 12B and 12D. . As shown in FIG. 2, the one light beam diffused in the vertical direction is reflected by the light emitting surface 6 and propagated inside the light guide member 3, and the other light beam diffused in the vertical direction is also transmitted. Is reflected by the diffusion pattern 11 on the reflecting surface 7, propagates into the light guide member 3, and is emitted from the light emitting surface 6. For this reason, the light diffusion at the part near the light-emitting diodes LED1 and LED3 of the light source 4 has higher brightness than the conventional case, and the hand becomes particularly bright.

  In this way, by forming the quadrangular pyramid-shaped convex portion (pyramid prism) 12 on the light incident surface 2, it is possible to add vertical diffusion in addition to horizontal diffusion of incident light.

Thereby, since the run-up distance until the light incident on the light guide member 3 is emitted can be shortened, the loss of light amount can be reduced, and the overall luminance can be increased. The component of normal incidence from the light source 4 to the light guide member 3 can be used because it is angled in the vertical direction by the quadrangular pyramid-shaped convex portion 12, which leads to an increase in light efficiency and an increase in screen brightness. Come to bring. For this reason, the dark region portion shown in FIG. 13 of the prior art is eliminated, the portion that was the dark region portion can be used, and the light guide member can be downsized,
The lighting device can be downsized.

  In the first embodiment of the present invention described above, the quadrangular pyramid-shaped convex portions 12 are linearly arranged in the thickness direction and the width direction of the light guide member 3 as shown in FIG. However, as shown in FIG. 5, the light guide member 3 may be arranged so as to be shifted in the thickness direction. Moreover, although not shown in figure, the convex part 12 may be formed only in the incident surface facing LED, and may be formed in a convex part partially in this way.

  Further, in the first embodiment of the present invention described above, the quadrangular pyramid-shaped convex portion 12 has one set of inclined surface portions 12A and 12C directed in the width direction of the light guide member 3, and the other set of The inclined surface portions 12B and 12D are directed in the thickness direction of the light guide member 3, but as shown in FIG. 6, the quadrangular pyramid-shaped convex portion 12 is formed into a quadrangular pyramid-shaped convex diamond shape. One set of inclined surface portions 12A and 12C is inclined 45 degrees with respect to the width direction of the light guide member 3, and the other set of inclined surface portions 12B and 12D is inclined 45 degrees with respect to the thickness direction of the light guide member 3. It may be. Also in this case, vertical diffusion can be added in addition to the horizontal diffusion of incident light, as in the first embodiment of the present invention.

  In the embodiment of the present invention described above, the light diffusing means for diffusing light three-dimensionally is formed with a quadrangular pyramid-shaped convex portion (pyramid prism) 12, but in the present invention, It may be a triangular or pentagonal or more polygonal pyramid shaped convex part.

  In this case, it is possible to diffuse the incident light in all directions, not to mention the diffusion of the incident light in the horizontal and vertical directions. For this reason, in addition to being able to shorten the run-up distance until the light incident on the light guide member main body 3A is emitted, it is possible to increase the overall luminance, and the light guide member 3 has a dark region portion. The portion that was the dark region portion can be used, and the light guide member 3 can be downsized.

  Further, in the present invention, as shown in FIGS. 7 and 8, the light diffusing means may be constituted by a large number of conical convex portions 14 protruding from the light incident surface 2.

  Also in this case, it is possible to diffuse the incident light in all directions, not to mention the horizontal and vertical diffusion of the incident light. For this reason, in addition to being able to shorten the run-up distance until the light incident on the light guide member main body 3A is emitted, it is possible to increase the overall luminance, and the light guide member 3 has a dark region portion. Thus, the portion that was the dark region can be used, and the light guide member 3 can be downsized. Similar to the first embodiment, the convex portions 14 may be arranged in a plurality of upper and lower rows and columns, or may be arranged on a part of the incident surface so as to be arranged on a portion facing the LED. You may arrange | position to the arrangement | positioning pattern of the convex part 12 shown in FIG. 5, FIG.

  In the present invention, as shown in FIGS. 9 and 10, the light diffusing means has a large number of square (polygonal) cones that taper from the light incident surface 2 toward the inside of the light guide member body 3 </ b> A. The recess 15 may be used.

  Also in this case, it is possible to diffuse the incident light in all directions, not to mention the horizontal and vertical diffusion of the incident light. For this reason, in addition to being able to shorten the run-up distance until the light incident on the light guide member main body 3A is emitted, it is possible to increase the overall luminance, and the light guide member 3 has a dark region portion. Thus, the portion that was the dark region can be used, and the light guide member 3 can be downsized. Similar to the first embodiment, the convex portions 14 may be arranged in a plurality of upper and lower rows and columns, or may be arranged on a part of the incident surface so as to be arranged on a portion facing the LED. You may arrange | position to the arrangement | positioning pattern of the convex part 12 shown in FIG. 5, FIG.

  Further, in the present invention, as shown in FIGS. 11 and 12, the light diffusing means is composed of a large number of conical recesses 16 that taper from the light incident surface 2 toward the inside of the light guide member main body 3A. It may be configured.

  Also in this case, it is possible to diffuse the incident light in all directions, not to mention the horizontal and vertical diffusion of the incident light. For this reason, in addition to being able to shorten the run-up distance until the light incident on the light guide member main body 3A is emitted, it is possible to increase the overall luminance, and the light guide member 3 has a dark region portion. Thus, the portion that was the dark region can be used, and the light guide member 3 can be downsized. Similar to the first embodiment, the convex portions 14 may be arranged in a plurality of upper and lower rows and columns, or may be arranged on a part of the incident surface so as to be arranged on a portion facing the LED. You may arrange | position to the arrangement | positioning pattern of the convex part 12 shown in FIG. 5, FIG.

  Further, in the illumination device using the light guide member 3 of the present invention described above, it is possible to diffuse the incident light in all directions, not to mention the diffusion of the incident light in the horizontal direction and the vertical direction. For this reason, in addition to being able to shorten the run-up distance until the light incident on the light guide member main body 3A is emitted, it is possible to increase the overall luminance, and the light guide member 3 has a dark region portion. Thus, the portion that was the dark region can be used, the light guide member 3 can be downsized, and the lighting device can be downsized.

  The present invention enables the diffusion of incident light in all directions, not to mention the diffusion of incident light in the horizontal and vertical directions. For this reason, in addition to being able to shorten the running distance until the light incident on the light guide member main body 3A is emitted, the overall luminance can be increased, and the dark region portion is eliminated. The light guide member which has the effect of enabling the use of the part which has been a part and enables miniaturization of the light guide member, and used for advertising lights, backlight devices of liquid crystal display devices, and the like, and It is useful for a lighting device using the same.

It is the perspective view which abbreviate | omitted one part of the illuminating device of this invention. It is the side view which abbreviate | omitted a part of the illumination device. It is the front view which abbreviate | omitted a part of the illumination device. It is an enlarged view of the A section of FIG. In the illuminating device of this invention, it is the front view which abbreviate | omitted one part which made it arrange | position by shifting the convex part of many pyramid shapes in the thickness direction of a light guide member. In the illuminating device of this invention, it is the front view which abbreviate | omitted one part in case many convex parts of a quadrangular pyramid are a quadrangular pyramid shape and a convex diamond shape. It is explanatory drawing at the time of comprising a light-diffusion means with many cone-shaped convex parts which protrude from a light-incidence surface. It is sectional drawing which follows the BB line of FIG. It is explanatory drawing at the time of comprising a light-diffusion means with many square (polygonal) cone-shaped recessed parts tapering from the light-incidence surface toward the inside of a light guide member main body. It is sectional drawing which follows the CC line of FIG. It is explanatory drawing at the time of comprising a light-diffusion means with many cone-shaped recessed parts which taper toward the inside of a light guide member main body from a light-incidence surface. It is sectional drawing which follows the DD line | wire of FIG. It is the perspective view which a part of conventional illuminating device abbreviate | omitted. It is the perspective view which a part of other conventional illuminating device abbreviate | omitted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Illumination device 2 Light incident surface 3 Light guide member 3A Light guide member main body 4 Light source 5 Reflector 6 Light emission surface 7 Reflective surfaces 8, 9, 10 Reflection side end surface 11 Diffusion pattern 12 Conical convex part (pyramid type Prism) (light diffusion means)
12A, 12B, 12C, 12D Inclined surface portion 14 Conical convex portion (light diffusion means)
15 Square (polygonal) cone-shaped recess (light diffusion means)
16 Conical recess (light diffusion means)

Claims (14)

In a light guide member including a light guide member body having a configuration in which a light exit surface for emitting light and a light incident surface for incident light intersect each other,
A light guide member characterized in that light diffusing means for diffusing the incident light in a three-dimensional manner toward the inside of the light guide member body is provided on the light incident surface.   2. The light guide member according to claim 1, wherein the light diffusing means includes a plurality of convex portions having a polygonal pyramid shape protruding from the light incident surface.   2. The light guide member according to claim 1, wherein the light diffusing unit includes a plurality of conical convex portions protruding from the light incident surface.   2. The light guide member according to claim 1, wherein the light diffusing unit includes a plurality of concave portions having a polygonal pyramid shape that tapers from the light incident surface toward the inside of the light guide member main body. .   2. The light guide member according to claim 1, wherein the light diffusing unit includes a plurality of conical recesses that taper from the light incident surface toward the inside of the light guide member main body.   The light guide member according to claim 2, wherein the polygonal pyramid shape is a quadrangular pyramid.   The light guide member according to claim 6, wherein one surface of the quadrangular pyramid is disposed to face the emission surface. In an illuminating device having a light guide member having a configuration in which a light exit surface that emits light and a light incident surface that enters the light intersect each other and a light source disposed on the light incident surface side,
An illuminating device characterized in that light diffusing means for diffusing the incident light of the light source in a three-dimensional manner toward the inside of the light guide member is provided on the light incident surface.   9. The illumination device according to claim 8, wherein the light diffusing means is configured by a plurality of convex portions having a polygonal pyramid shape protruding from the light incident surface.   9. The illumination device according to claim 8, wherein the light diffusing means is configured by a plurality of conical convex portions protruding from the light incident surface.   9. The illumination device according to claim 8, wherein the light diffusing means is configured by a plurality of concave portions having a polygonal pyramid shape that tapers from the light incident surface toward the inside of the light guide member main body.   9. The illumination device according to claim 8, wherein the light diffusing unit is configured by a large number of conical recesses that taper from the light incident surface toward the inside of the light guide member main body.   The lighting device according to claim 9 or 11, wherein the polygonal pyramid shape is a quadrangular pyramid. The lighting device according to claim 13, wherein one surface of the quadrangular pyramid is disposed to face the emission surface.

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