JP2002133908A - Light-emitting device and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting device, by which the light from light- emitting diodes which is a light source, is diffused effectively and is allowed to irradiate an object or objective person with high luminance. SOLUTION: The light-emitting device 1 includes a transparent, bar-shaped diffusion member 11 and a cap 31 having a light source 21 inside, comprising a plurality of light-emission diode 21a, 21b, and 21c, wherein insulating oil 3 is sealed into the cap 31, the inside of which is the passage of the light coming from the light source 21 into the diffusion member 11. A first reflection plate 17 is provided on the end surface of the diffusion member 11, the end surface being opposite to the light source 21, while a second reflection plate 39 is provided on the cap 31, the second reflection plate being opposite to the first reflection plate. On the sidewall of the diffusion member 11, a plurality of sidewall reflection plates 15 are arranged radially, wherein a space is formed between each sidewall reflection plate 15, a lens member 13a is integrally molded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device having a light emitting diode as a light source, and a display device having the light emitting device.

[0002]

2. Description of the Related Art Conventionally, a light emitting diode is often used as a light source of a light emitting device which does not require high brightness, such as an electric bulletin board, other display lights, and warning lights.
In general, incandescent lamps, fluorescent lamps, halogen lamps, and the like are still used as light sources for light-emitting devices that require high luminance.

A light emitting diode is not used as a light source requiring a high luminance because a sufficient luminance cannot be obtained by itself as compared with an incandescent lamp, a fluorescent lamp, a halogen lamp, or the like. In other words, the only way to make a high-luminance lighting device or the like using light-emitting diodes is to attach a large number of light-emitting diodes and supplement the luminance with the number.

[0004]

However, the light emitting diode is superior in power consumption and durability in comparison with a conventional incandescent lamp or the like, and can emit light with high luminance, and is thus illuminated. If it can be replaced with lights, indicator lights, warning lights, and other light-emitting devices, power consumption can be reduced, and it is not necessary to frequently replace light sources due to burnout of bulbs. Very socially beneficial.

[0005] For these reasons, there has been a great social demand for the development of light-emitting diodes with higher brightness than before, and research and development on the improvement of the brightness of such light-emitting diodes has been conducted by various research institutions. Results are being obtained. However, there are still many light-emitting devices using light-emitting diodes in which light-emitting diodes are simply arranged, and it cannot be said that a sufficiently useful light-emitting device has been developed. For example, a lighting device using a current light emitting diode as a light source,
In many cases, point light sources are used, but even if the brightness of the light emitting diode is increased, light cannot be diffused on average, so the brightness is too high near the light source, and the brightness is not sufficient at a remote position. Would.

The light emitting diode requires low power consumption and its usefulness in durability. Therefore, the light emitting diode of the light source is efficiently propagated and diffused, and the light is emitted from the object or the subject. If the direction in which is located can be illuminated, higher luminance and power saving can be achieved, which can be very useful.

The present invention has been made in view of such a problem, and in a light emitting device using a light emitting diode as a light source, the light emitted from the light source is efficiently diffused, and a high luminance is given to an object or a person. It is an object to provide a light-emitting device that can emit light and a display device including the light-emitting device.

[0008]

In order to achieve the above object, according to the present invention, there is provided a light emitting device comprising a light emitting diode as a light source and a transparent diffusion member for diffusing light from the light source. It is provided with a cap member for fitting to the diffusion member, the light source is fixed inside the cap member, of the light incident on the diffusion member from the light source fixed to the cap member A liquid for increasing the transmittance of light from the light source is sealed in the path.

According to a second aspect of the present invention, there is provided a light emitting device including a light emitting diode as a light source and a transparent diffusion member for diffusing light from the light source, wherein the diffusion member is made of synthetic resin. By encapsulating the light source and performing injection molding,
It is characterized by being formed integrally with the light source.

According to a third aspect of the present invention, in the light emitting device according to the first or second aspect, the diffusion member has a rod shape, and the light source is provided at one end of the diffusion member. I do. According to a fourth aspect of the present invention, in the light emitting device according to the third aspect, the diffusion member has a side wall for reflecting light propagating from the inside of the diffusion member toward the side wall toward the inside of the diffusion member. A reflecting plate is provided along the longitudinal direction of the diffusion member.

According to a fifth aspect of the present invention, in the light emitting device according to the fourth aspect, a plurality of the side wall reflectors are radially arranged on a side wall of the diffusion member from a central axis in a longitudinal direction of the diffusion member. It is characterized by having been done. According to a sixth aspect of the present invention, in the light emitting device according to any one of the third to sixth aspects, the light that propagates from the inside of the diffusion member toward the tip thereof is provided to the diffusion member. A first reflection plate for reflecting light inside is provided on an end surface of the diffusion member opposite to the light source.

According to a seventh aspect of the present invention, in the light emitting device according to the sixth aspect, the second light for reflecting the light reflected from the first reflector and entering the light source toward the inside of the diffusion member again. The reflector is provided at an end on the light source side. The invention described in claim 8 is the third invention.
The light emitting device according to any one of claims 1 to 7, wherein a lens member for determining an emission angle of diffused light from the diffusion member is provided on a side wall of the diffusion member along a longitudinal direction of the diffusion member. It is characterized by having been done.

According to a ninth aspect of the present invention, in the light emitting device according to the eighth aspect, the lens member is formed integrally with the diffusion member. According to a tenth aspect of the present invention, in the light emitting device according to any one of the first to ninth aspects, the light source includes a plurality of light emitting diodes that emit light of different colors. And

According to the present invention, there is provided a display panel on which a display pattern formed of characters, figures, symbols or a combination thereof is formed, and the display panel is illuminated from the inside to display the display pattern. And a light-emitting device comprising: a light-emitting device;
The light-emitting device according to any one of the above.

According to a twelfth aspect of the present invention, there is provided a display device capable of three-dimensionally displaying a display pattern composed of characters, figures, symbols, or a combination thereof.
0 is provided, and the display symbol is formed by combining a plurality of the light emitting devices.

According to a thirteenth aspect of the present invention, there is provided a display device capable of three-dimensionally displaying a display pattern composed of characters, figures, or symbols, or a combination thereof.
0, wherein the diffusing member of the light emitting device is formed in a shape corresponding to the display symbol.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The light emitting device according to the first aspect of the present invention has the following features to enhance the transmittance of light incident on a diffusion member from a light source.
A liquid is sealed in a path of light incident on the diffusion member from the light source. The liquid used here is selected to be transparent and has a refractive index close to that of the diffusion member, so that the transmittance of light from the light source can be increased. When such liquid is sealed, compared to when no liquid is sealed,
Most of the light reflected by the difference in refractive index from air is transmitted through the diffusion member and propagates, so that the intensity of light diffused from the diffusion member to the outside increases, and the light emitting device can emit light with high luminance. .

In the light-emitting device according to the second aspect, if an air layer is present in the light path when the light enters the diffusion member, the light transmission loss increases, so the diffusion member is injection-molded with a synthetic resin. At this time, a light emitting diode is sealed so that an air layer is not formed. Thus, the light emitting device according to the second aspect can emit light with high luminance, similarly to the light emitting device according to the first aspect.

According to a third aspect of the present invention, in the light emitting device, the diffusion member has a rod shape, and a light source is provided at one end of the diffusion member. Thereby, the light diffused from the light emitting device to the outside is
Since the light is not diffused radially from one point but is diffused averagely in the direction perpendicular to the axis of the diffusion member, the light emitting device of the present invention has a higher intensity of emitted light compared to a conventional light emitting device that is a point light source. Even if they are the same, the range that can be illuminated can be widened. Further, since the light emitting device of the present invention has a larger light emitting area than a point light source light emitting device, visibility is improved, and the effect can be exhibited even when used for a warning light, an indicator light, or the like.

A light emitting device according to a fourth aspect is a light emitting device in which a diffusion member is provided with a side wall reflector along a longitudinal direction thereof. In a light emitting device without a side wall reflector, light is diffused uniformly from the diffusion member, but the light emitting device does not necessarily need to diffuse light to the entire surroundings, and depending on its use,
In some cases, it is better to diffuse light in a specific direction. Therefore, if the light emitted in the direction that does not need to be diffused is originally returned to the inside of the diffusion member by the side wall reflector, the emitted light in the direction not blocked by the side wall reflector is provided. And the brightness of the light emitting device can be increased. Further, in this way, the user can irradiate the object or the subject with high-brightness light with low power consumption.

According to a fifth aspect of the present invention, in the light emitting device, the side wall reflecting plate of the fourth aspect is radially arranged on the side wall of the diffusion member. When the light-emitting device is used for a device that mainly requires visibility, such as a warning light, there is a high possibility that the subject who needs to be visually recognized is in the vicinity, and light is emitted around the subject so that the subject can view it. It needs to be spread. However, in such a case, the light does not have to be uniformly diffused in all directions, and the light may be diffused within the range of the visual field of the subject. Therefore, the light emitting device of the present invention uses the radially arranged side wall reflectors to disperse the light emitting directions to the extent that the target person can visually recognize them, and instead increase the light brightness. Thus, the light from the light emitting device can be visually recognized even by a distant subject, and the light can be visually recognized by surrounding subjects.

According to a sixth aspect of the present invention, in the light emitting device, a first reflector is provided on an end surface of the diffusion member opposite to the light source. Since the light emitting device includes the light source at one end of the diffusion member, most of the light is emitted from the tip of the diffusion member. Therefore, when the first reflection plate is provided on the diffusion member, light originally emitted from the front end of the diffusion member returns to the inside by the first reflection plate and exits from the side wall. As a result, the intensity of light diffused from the side wall of the diffusion member increases, and the luminance of the light emitting device can be increased.

Further, if the second reflector is provided at one end as in the light emitting device according to claim 7, the light source is included in the light reflected from the first reflector provided at the end face of the diffusion member. Light propagating in the direction can be reflected back into the diffusion member. Therefore, the luminance of the light emitting device can be further increased by using the light emitting device together with the first reflector.

In the light emitting device according to the eighth aspect, a lens member is provided along the longitudinal direction of the diffusion member so that the emission angle of light emitted from the side wall of the diffusion member can be adjusted by the lens member. It was done. Accordingly, if the lens member is formed in such a shape that the spread angle of the emitted light is reduced, the light emitting device can increase the intensity of the light irradiated in a specific direction, and the object or the object in that direction can be increased. It is possible to illuminate the person sufficiently brightly and to enhance the visibility from the target person. Further, if the lens member is formed in such a shape that the divergence angle of the outgoing light becomes large, the illumination range can be widened while brightening the central portion of the illumination range as in the case where the lens member is not used. When the irradiation range is the same as when the member is not used, the subject can feel bright.

Further, when the lens member is integrally formed with the diffusion member as in the light emitting device according to the ninth aspect, no air layer is formed between the lens member and the diffusion member. The light emission angle can be adjusted and the luminance and visibility in a specific direction can be increased without causing light propagation loss due to passing through the member.

In addition, like the light emitting device according to claim 10, the light source of the light emitting device according to claim 1 is
If the light emitting device is configured by a plurality of light emitting diodes that emit light of different colors, the light emitting device can emit light of various light colors by combining the light emitted from these light emitting diodes. This broadens the range of applications for light emitting devices,
It can be used not only as a lighting device and a warning light but also as a light source for an illuminated signboard.

Further, a display device can be constituted by using the light emitting device according to any one of the first to tenth aspects. The display device according to claim 11 includes a display plate on which a display pattern is formed, and the light emitting device according to claim 1, wherein the display plate is illuminated with light from the light emitting device, The display symbol on the display panel is displayed.
As described above, when the display panel is illuminated using the light emitting device of the present invention, light from the light source is diffused from the surface of the diffusion member, and light from a normal light emitting diode serving as a point light source is directly displayed. Rather than illuminating the board to illuminate the display design,
The display design can be uniformly illuminated. In other words, the display pattern can be clearly displayed without illuminating the display panel by arranging many light emitting diodes as in a conventional display device.

Further, in the display device of the present invention, the light from the light emitting diode is efficiently diffused to the outside by using an insulating oil or by integrally molding the light emitting diode and the diffusion member. Since the brightness of the image is increased, the display pattern can be displayed more clearly.

Furthermore, the light-emitting device of the present invention using a light-emitting diode consumes less power and can be used for a longer period of time than a conventional incandescent lamp or the like. The labor required for managing the display device such as replacement of the light emitting device can be greatly reduced.

The display device according to the twelfth aspect is the display device according to the first aspect.
A display symbol is formed by combining a plurality of the light emitting devices according to any one of claims to 10, and the display symbol is displayed by light diffused from the diffusion member. In this way, the light from the diffusion member forming the display symbol directly reaches the subject's eyes, so that the visibility of the display symbol is good, and the display symbol can be formed by combining the diffusion members. A desired display symbol can be easily configured.

A display device according to a thirteenth aspect is the display device according to the first aspect.
The display symbol can be displayed by forming the diffusion member of the light emitting device according to any one of claims to 10 into a shape corresponding to the display symbol. With this configuration, the light from the diffusion member forming the display symbol directly reaches the eyes of the subject, so that the visibility of the display symbol is good and the configuration of the display device can be simplified.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the structure and operation of the light emitting device of the present invention described above, embodiments of the present invention will be described below with reference to the drawings. The light emitting device 1 of the first embodiment mainly includes a rod-shaped diffusion member 11 for diffusing light to the outside, and a cap member 31 having a light source 21 inside. FIG. 1 shows a light emitting device 1 according to the first embodiment.
FIG. 2 is a schematic diagram showing the configuration of FIG.

The diffusion member 11 is formed of a transparent acrylic resin so that the light from the light source 21 is not attenuated inside the diffusion member 11, and is formed in a columnar shape. On the side wall, a convex lens member 13a is integrally formed with the diffusion member 11, and the lens member 13a of the diffusion member 11 is formed.
A side wall reflector 15 shown by a dotted line in FIG.

The cap member 31 is made of aluminum.
It has a substantially cylindrical shape with one open end closed so as to fit into the diffusion member 11, and has a light source 21 inside. The cap member 31 is attached to one end of the diffusion member 11.
Are fitted, and the light from the light source 21 is
The light enters the diffusion member 11 from one end. Further, a first reflection plate 17 for reflecting light from the light source 21 fixed inside the cap member 31 to the inside of the diffusion member 11 is provided on an end surface of the diffusion member 11 opposite to the cap member 31. Have been.

Here, the first reflection plate 17 and the side wall reflection plate 15 are sealed and formed inside the diffusion member 11 when the diffusion member 11 is injection-molded with acrylic resin.
It may be formed so as to be bonded to the surface of the diffusion member 11. Further, the diffusion member 11 of the first embodiment is not so long with respect to the cap member 31, but may be appropriately determined depending on the application as long as the light from the light source 21 is sufficiently transmitted. .

Next, FIG. 2 is an explanatory diagram showing the internal configuration of the light emitting device 1. 2A is a cross-sectional view of the light emitting device 1 which is a plane parallel to the longitudinal direction of the light emitting device 1, and FIG.
2B is a cross-sectional view of the diffusion member 11 which is a plane perpendicular to the longitudinal direction of the diffusion member 11, and FIG. 2C is a bottom view of the cap member.

As shown in FIG. 2A, the cap member 3
1, a light emitting diode 21a that emits red light, which is a light source 21, and a light emitting diode 2 that emits green light
1b and a light emitting diode 21c that emits blue light are fixed side by side in the longitudinal direction.

Here, the light emitting diodes 21a, 21b,
The reason why the arrangement of 21c is such is to prevent the diameter of the diffusion member 11 from becoming large and to make the light emitting device itself compact. Light emitting diode 21 used
Since a, 21b, and 21c are formed by covering the light-emitting body with a transparent resin, even if the light-emitting diodes 21a, 21b, and 21c are arranged side by side in the longitudinal direction,
The light is not hindered by the other diodes.

Further, as described above, the light emitting device 1 of the first embodiment has the light emitting diodes 21a, 21b,
Various light sources can be emitted by controlling the current values of the light emitting diodes 21a, 21b, and 21c. Therefore, if the intensity of the red light, the green light, and the blue light are all the same by the current control and the light emitted from the light source 21 is the white light, it can be used as a lighting device such as a conventional fluorescent lamp. To emit only red light,
By making 1 blink, the light emitting device 1 can be used also for an electric sign, a warning light, and the like.

Further, the inside of the cap member 31 to which the light source 21 is fixed is filled with an insulating oil 33 as a liquid for increasing the transmittance of light to the diffusion member 11. When the insulating oil 33 is sealed in this manner, the light transmittance is increased because the insulating oil 3 is higher than the refractive index of air.
This is because the refractive index of 3 is closer to the refractive index of the acrylic resin.

When light enters the diffusion member 11 made of acrylic resin from the air layer, most of the light is reflected because the relative refractive index of the acrylic resin to air is very large. However, when the insulating oil 33 is sealed in the light path from the light source 21 to the diffusion member 11, the relative transmittance of the acrylic resin to the insulating oil 33 is smaller than the relative refractive index to air. Increase, diffusion member 1
The intensity of light incident on the inside of the light source 1 increases. Therefore, when the insulating oil 33 is sealed inside the cap member 31, which is a path of light incident on the diffusion member 11 from the light source 21,
This is because the intensity of light emitted from the diffusion member 11 increases, and the luminance of the light emitting device 1 increases.

The insulating oil 33 is applied to the cap member 31.
A screw hole 35a for injecting the insulating oil 33 is formed in the cap member 31 of the light emitting device 1 of the first embodiment. Therefore, if the cap member 31 is fitted to one end of the diffusion member 11 and oil is injected from the screw hole 35a and the screw 35b is screwed, the insulating oil 33 can be sealed. still,
The two screw holes 35a are formed so that the air inside the cap member 31 can easily escape when oil is injected.

In addition, the cap member 31 is provided with a second reflector 39 on a surface facing the first reflector 17. This is for enabling the light returning to the light source direction among the light reflected by the first reflection plate 17 to be returned to the inside of the diffusion member 11 again. With this configuration, the light propagating from the first reflector 17 toward the light source 21 is reflected by the second reflector 39 into the diffusion member 11, so that the brightness of the light emitting device 1 can be increased.

The light emitting diodes 21a, 21b, 21c are provided on the bottom of the second reflection plate 39 and the cap member 31 thereof.
A lead hole 36 for passing the lead is provided.
Since the cap member 31 of the first embodiment is made of aluminum, the insulating oil 33 cannot be sealed as it is. However, after the lead is passed through the lead hole 36, the lead hole 36 is closed with a synthetic resin or the like. The insulating oil 33 does not leak from the lead hole 36.

As described above, the screw hole 35a is formed in the cap member, and the insulating oil 33 is injected from the screw hole 35a. A hole is formed corresponding to 35a so that the insulating oil 33 can be injected into the inside of the cap member.

In addition, the cap member 31 is inserted so that the diffusion member 11 is not inserted into the cap member 31.
Is provided with a protrusion 37 inside. As described above, the light emitted from the light source 21 fixed to the cap member 31 is guided into the diffusion member 11 by the second reflection plate 39 and the first reflection plate 17, and is directed to the side wall of the diffusion member 11. To spread. However, since the side wall reflector 15 is provided on the side wall of the diffusion member 11, the light is also reflected by the side wall reflector 15, and the light from the light source 21 is finally emitted from the lens member 13a.

In the light emitting device 1 of the first embodiment, as shown in FIG. 2, the side wall reflecting plate 15 is provided on the side wall of the diffusion member 11 along the longitudinal direction of the diffusion member 11 from the central axis of the diffusion member 11. Since a plurality of light beams are radially arranged, the light propagating in this direction is returned to the inside of the diffusion member 11 again by the side wall reflection plate 15. Note that being radially arranged means that the adjacent side wall reflection plates 15 are arranged at an equal angle with respect to the central axis of the diffusion member 11. That is, in the light emitting device 1 of the first embodiment, the three side wall reflectors 15
It is arranged at equal intervals by degrees.

The lens member 13a is provided between the diffusion member 1 and the adjacent side wall reflecting plate 15 arranged as described above.
Three are arranged on one side wall along the longitudinal direction. That is, since the lens members 13a are arranged at equal intervals of 120 degrees, light from the light source 21 is emitted in three directions different by 120 degrees through the lens member 13a.

Further, when the light is emitted from the surface of the lens member 13a, the light propagates by changing its emission direction by refraction. That is, due to refraction, the angle of incidence of light incident on the surface of the lens
The exit angle of the light exiting from the surface changes, and the light propagates in a direction different from the exit direction of the light when the lens member 13a is not installed. Therefore, the lens member 13
The degree of diffusion of the light emitted from a, that is, the spread angle of the light emitted from the lens member 13a can be adjusted by changing the shape of the lens member 13a.

For example, as shown in FIG. 3 (a), the surface of the lens member 13a of the first embodiment has a center axis O at the center axis of the diffusion member 11 and a side wall which intersects a plane perpendicular to the center axis. Since the processing is performed so that the radius of curvature is smaller than the radius of the circle, the light passing through the lens member 13a can be refracted to the vertex side of the convex portion of the lens member 13a.

In other words, since the center point O 'of the circle having the arc of the surface of the lens member 13a is closer to the side wall than the center point O of the circle having the side wall of the diffusion member 11 as the circumference, the light is transmitted to the center of the circle. Assuming that the light propagates from the point O in the direction of the lens member 13a, the emission angle Y with respect to the normal direction of the curved surface of the lens member 13a becomes the incident angle X because the relative refractive index of air with respect to the lens member 13a is smaller than 1. Larger than
The light is refracted in the direction of the line connecting the center point O and the center point O ′ with respect to the normal line of the diffusion member 11 extending further from the center point O. Therefore, the light that has passed through the lens member 13a is
The light propagates along a path whose divergence angle becomes smaller or converges at a certain focal point, and the light emitting device 1 emits light so as to increase the luminance in a specific direction.

Further, the shape of the lens member 13a of the first embodiment may be changed to a shape as shown in FIG.
In other words, if the lens member 13b is formed so that the radius of curvature of the surface is larger than the radius of the circle of the diffusion member, unlike the lens member 13a,
The spread angle of the light emitted from b can be increased. Note that, among the light emitted from the lens member 13b, the intensity of the light propagating in the linear direction connecting the center point O and the center point O ′ is not so affected by passing through the lens member 13b. Is diffused in a wide range in such a manner that the luminance is high in the linear direction and the luminance is weakened as the position deviates from the direction.

On the other hand, in the case of the light emitting device 1 which does not use the lens member 13b but merely reduces the width of the arc of the side wall reflector 15 and increases the spread angle of the emitted light, Light emitted from the side wall of the diffusion member 11 is uniformly diffused from the side wall. Therefore, in the light emitting device 1 in which the divergence angle is increased by using the lens member 13b, even if the divergence angle is the same as in the case where the divergence angle is increased without using the lens member 13b, the subject is The light emitting device 1 can be felt even brighter.

The operation and effect are described in FIG.
Instead of the lens member 13b shown in FIG.
The same can be obtained by using a concave lens member 13c as shown in FIG. The above is the cap member 3
This is a description of the light emitting device 1 of the first embodiment including the light emitting device 1.
The light emitting device 41 of the embodiment will be described with reference to FIG.

FIG. 4 is an explanatory view showing the structure of the light emitting device 41 of the second embodiment. FIG. 4 (a) is a perspective view of the light emitting device 41, and FIG. It is sectional drawing of the light emitting device 41 which is a parallel surface. This light emitting device 41
Is composed of a transparent rod-shaped diffusion member 11, a light source 21, a side wall reflection plate 15, a first reflection plate 17, and a second reflection plate 39.

The diffusion member 11 is made of an acrylic resin, is formed in a columnar shape, and has a light source 21 at one end. That is, the diffusion member 11 is formed by enclosing the light emitting diodes 21a, 21b, and 21c serving as the light source 21 when injection molding is performed using an acrylic resin. The reason for this formation is to prevent an air layer that causes light propagation loss from being formed in the path of the light propagating from the light source 21 to the diffusion member 11. Light source 21 and diffusion member 11
Is integrally formed, no air layer is formed in such a light path, so that the light emitting device 41 can emit light with sufficient luminance.

In order to increase the luminance, the light emitting device 41 does not diffuse the light transmitted from the light source 21 from the tip of the diffusion member 11 to the end of the diffusion member 11 opposite to the light source 21. A first reflection plate 17 is provided. Further, a second reflector 39 is provided on the end face on the light source side of the diffusion member 11, and the light reflected from the first reflector 17 and returning to the light source 21 is returned to the inside of the diffusion member 11 again. I can guide you. As described above, all the light from the light source 21 is returned to the inside of the diffusion member 11, and is finally diffused outside from the side wall of the diffusion member 11.

Note that, similarly to the light emitting device 1 of the first embodiment, three side wall reflectors 15 are provided radially on the side wall of the diffusion member 11 shown by the dotted line in FIG. Thereby, the intensity of the light emitted from the side wall is increased. Further, the light source 21 of the light emitting device 41 of the second embodiment
Are light emitting diodes 21a that emit red light, light emitting diodes 21b that emit green light, and light emitting diodes 21c that emit blue light, similarly to the light source 21 of the first embodiment.
It is configured to emit various lights by combining those lights.

The structure of the light emitting device 41 of the second embodiment has been described. The light emitting device 41 of the second embodiment is mainly composed of the light source 21.
Is sealed at one end of the diffusion member 11 at the time of injection molding. Therefore, similarly to the light emitting device 1 of the first embodiment, the lens members 13a, 13b, and 13c are provided on the side walls, and these are diffused. It may be formed integrally with the member 11.

The side wall reflection plate 15, the first reflection plate 17, and the second reflection plate 39 of the light emitting device 41 of the second embodiment are all sealed inside when the diffusion member 11 is injection-molded. The first reflector 17 and the second reflector 39 may be formed on the end face of the diffusion member 11, and the side wall reflector 15 may be formed on the side wall thereof. However, in the case of joining, it is necessary to prevent an air layer or the like from being formed on the joining surface.

Next, since the light emitting device 41 of the second embodiment can be used as a light source of a display device, a display device 51 using the light emitting device 41 will be described below with reference to FIG.
Will be described. However, in the light emitting device 41 used in the display device 51, the side wall reflection plate 15 is not arranged radially, and only one is disposed on a frame or a support plate side, which will be described later, so that a display symbol is displayed in front. I have. Also, FIG.
FIG. 4 is an explanatory diagram related to a display device 51 using the light emitting device 41, and is a schematic perspective view illustrating a configuration of a display device 51 including a display plate 55 on which a display pattern 53 composed of characters ABC is formed and the light emitting device 41. .

As shown in FIG. 5, the display device 51 includes a display plate 55 on which a display pattern 53 is formed, a light emitting device 41 for illuminating the display plate 55 from the inside thereof to display the display pattern 53, Frame 57 for fixing display panel 55
And a fixing member 59 for fixing the light emitting device 41 to the frame 57.

That is, the display plate 55 is formed of a transparent acrylic resin plate member, and has a display pattern 53 printed on the surface thereof using pigments of various colors. The frame 57 for fixing the display plate 55 is hollow and box-shaped with one end opened. The display plate 55 is joined to the frame 57 so as to close the open end, and the display plate 55 is fixed to the frame 57 by screwing screws from screw holes (not shown) at the ends of the display plate 55. I can do it.

A fixing member 59 for fixing the light emitting device 41 is formed in a plate shape, and a groove is formed on the surface thereof so as to be fitted to an end of the light emitting device 41.
1 are arranged inside the frame 57 corresponding to the end faces on both sides. The light emitting device 41 is sandwiched and fixed by fitting both ends into grooves (not shown) formed in the fixing member 59, and is fixed inside the frame 57.

In the display device 51, the light emitting device 4 fixed to the frame 57 by the fixing member 59 in this way.
When the light from No. 1 is applied to the display plate 55 fixed to the frame 57, the display symbol 53 formed on the display plate 55
It can be illuminated and displayed.

The method for fixing the light emitting device 41 to the frame 57 is not limited to the fixing member 59, and the light emitting device 41 may be fixed to the frame 57 using a belt or the like. The display pattern 53 is formed by using a transparent sheet-like color film instead of using a pigment.
It can also be formed by sticking to a portion corresponding to the display symbol 53 of No. 5.

The above is the description of the display device 51 using the display plate 55. Even if the display device 51 is not used, for example, as shown in FIG. By arranging them at positions corresponding to the respective portions of the character E, it is possible to form the display device 61 capable of displaying the character E, which is the display symbol 63, in three dimensions.

That is, a fixing member 59 for fixing the light emitting device 41 is attached to the support plate 65, and both ends of the light emitting device 41 are fitted into grooves formed in the fixing member 59, so that the light emitting device 41 is 65 and the display symbol 63 may be formed. If the light emitting device 41 is deformed and fixed to the support plate 65 as shown in FIG. 6B, the display device 71 that can display the display pattern 73 such as the character C in three dimensions even with one light emitting device 41 can be used. Can be formed.

In the display devices 61 and 71, the light emitted from the light emitting device 41 directly and three-dimensionally forms the display symbols 63 and 73 as compared with the display device 51 described above. Therefore, if the light from the light emitting diode is made colorful, the display symbols 63 and 73 can be clearly displayed. still,
FIG. 6 shows a display device 6 using the light emitting device 41 of the second embodiment.
FIG. 6A is an explanatory diagram showing a configuration of a light emitting device 1 and a light emitting device 71. FIG.
FIG. 6B is a perspective view of the display device 61 on which the character E of 3 is formed, and FIG. 6B shows the display device 71 on which the character C of the display symbol 73 is formed by deforming the diffusion member 11 of the light emitting device 41. FIG.

Although the embodiments of the present invention have been described above, the light-emitting devices 1 and 41 of the present invention mainly provide a light path from the light source to the diffusion member so that an air layer is not formed, and Therefore, the present invention is not limited to the above-described embodiment, and various modes can be adopted as long as the purpose is not contradicted.

For example, the insulating oil 33 is used inside the cap member 31 of the first embodiment as a liquid for increasing the transmittance of light to the diffusing member 11. The present invention is not limited to this. Distilled water or the like may be used as long as it has insulating properties and the intensity of light transmitted to the diffusion member 11 increases. In the light emitting device 1 of the first embodiment, the liquid is sealed using the screw holes 35a and the screws 35b. However, any method can be used as long as the liquid can be sealed. The liquid may be sealed by inserting a ring.

In addition, acrylic resin is used for the diffusion member 11, but other synthetic resins may be used as long as they are transparent. Further, the shape of the diffusion member 11 does not necessarily have to be a columnar shape, and may be formed in a square rod shape or a spherical shape.
The point is that the shape is determined according to the use of the light emitting devices 1 and 41, and the light path between the light source 21 and the diffusion member 11 is filled with an insulating oil 33 or the like,
Can be integrally formed during the injection molding of the diffusion member 11.

Further, the side wall reflectors 15 of the light emitting devices 1 and 41 described in the embodiment are arranged particularly to enhance the visibility of the light emitting devices 1 and 41. 41 does not limit the number or arrangement. That is, the number of the side wall reflectors 15 of the light emitting devices 1 and 41 of the present invention may be determined and arranged according to the application.
Similarly, the number, arrangement, and shape of the lens members 13a, 13b, and 13c may be determined according to the application, and may not be provided if unnecessary.

The light source 21 is composed of light emitting diodes 21a, 21b, 21c of different colors, but the number of light emitting diodes 21a, 21b, 21c used as the light source 21 is not particularly limited. Instead, various light emitting diodes 21a, 21
b and 21c may be combined and used as the light source 21. That is, the light emitting diode 21 that emits light of the same color
The light source 21 may be provided by providing a plurality of a, 21b, and 21c.

In addition, the display device 51 described in the embodiment,
The light emitting device 1 is replaced with the light emitting device 41 instead of the light emitting device 41.
Etc. may be used. That is, for example, if the light emitting device 1 having a lens member arranged so that light converges on the display symbol 53 of the display plate 55 is provided on the display device 51 instead of the light emitting device 41, the display symbol 53 becomes brighter. Lighting is convenient.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of a light emitting device 1 according to a first embodiment, and is a perspective view thereof.

FIG. 2 is an explanatory diagram illustrating a configuration of a light emitting device 1 according to a first embodiment.

FIG. 3 is an explanatory diagram illustrating a path of light propagating through lens members 13a, 13b, and 13c.

FIG. 4 is an explanatory diagram illustrating a configuration of a light emitting device 41 according to a second embodiment.

FIG. 5 is a schematic perspective view illustrating a configuration of a display device 51 using the light emitting device 41.

6 is an explanatory diagram illustrating a configuration of display devices 61 and 71 using the light emitting device 41. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1, 41 ... Light emitting device 11 ... Diffusion member 21 ... Light source 31 ... Cap member 13a, 13b, 13c ... Lens member 15 ... Side wall reflector 17 ... First reflector 21a, 21b, 21c ... Light emitting diode 33 ... Insulating oil 35a ... Screw hole 35b ... Screw 36 ... Lead hole 37 ... Protrusion 39 ... Second reflector 51,61,71
... display devices 53, 63, 73 ... display symbols 55 ... display plates 57 ...
Frame 59: fixing member 65: support plate

Claims (13)

[Claims] 1. A light emitting device comprising a light emitting diode as a light source and a transparent diffusion member for diffusing light from the light source, comprising: a cap member for fitting to the diffusion member; The light source is fixed inside the member, and a liquid for increasing the transmittance of light from the light source is sealed in a path of light incident on the diffusion member from the light source fixed to the cap member. A light-emitting device, comprising: 2. A light-emitting device comprising a light-emitting diode as a light source and a transparent diffusion member for diffusing light from the light source, wherein the diffusion member emits light while enclosing the light source with a synthetic resin. A light emitting device, which is formed integrally with the light source by molding. 3. The light emitting device according to claim 1, wherein the diffusion member has a rod shape, and the light source is provided at one end of the diffusion member. 4. The diffusion member is provided with a side wall reflector for reflecting light propagating from the inside of the diffusion member toward the side wall thereof to the inside of the diffusion member along a longitudinal direction of the diffusion member. The light emitting device according to claim 3, wherein the light emitting device is provided. 5. The light emitting device according to claim 4, wherein a plurality of the side wall reflectors are radially arranged on a side wall of the diffusion member from a central axis in a longitudinal direction of the diffusion member. 6. The diffusion member has a first reflector for reflecting light propagating from the inside of the diffusion member toward the tip thereof to the inside of the diffusion member, opposite to the light source of the diffusion member. 4. The device according to claim 3, wherein the second end is provided on the side end surface.
The light emitting device according to claim 6. 7. A second reflector for reflecting light reflected from the first reflector and entering the light source toward the inside of the diffusion member again is provided at an end on the light source side. The light emitting device according to claim 6, wherein 8. A lens member for determining an emission angle of diffused light from the diffusion member is provided on a side wall of the diffusion member along a longitudinal direction of the diffusion member. The light emitting device according to claim 3. 9. The light emitting device according to claim 8, wherein the lens member is formed integrally with the diffusion member. 10. The light-emitting device according to claim 1, wherein the light source includes a plurality of light-emitting diodes that emit light of different colors. 11. A display panel having a display pattern formed of characters, figures, symbols, or a combination thereof, and a light emitting device for illuminating the display panel from the inside thereof and displaying the display pattern. A display device according to claim 1, wherein the light emitting device is the light emitting device according to any one of claims 1 to 10. 12. A display device capable of three-dimensionally displaying a display pattern composed of characters, figures, or symbols, or a combination thereof, comprising a plurality of light emitting devices according to any one of claims 1 to 10, The display device, wherein the display symbols are formed by combining the light emitting devices. 13. A display device capable of three-dimensionally displaying a display pattern composed of a character, a figure, a symbol, or a combination thereof, comprising: the light emitting device according to claim 1; Wherein the diffusion member is formed in a shape corresponding to the display symbol.