JPH09160032A - Illuminator, liquid crystal display device using the illuminator, portable terminal equipment, on board equipment and optical recognition device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a surface light source device thin in thickness and to improve optical coupling efficiency by consecutively forming a light source part in which a light emitting element is sealed and a light transmitting part of transparent resin material. SOLUTION: A light transmission plate 22 made of the transparent resin material such as methacrylic resin is constituted of the light source part 24 in which one or two or more light emitting elements 23 such as a light emitting diode are sealed, and the light transmitting part 26 in which light R outgoing from the light source part 24 is shut and which emits the light R from the light emitting surface 25 being an upper surface. A diffusing plate 30 disposed above the light transmission plate 22 is a sheet or a film made of synthetic resin, whose surface is worked to be finely rugged. The light emitted from the upper surface of the light transmitting surface 25 is diffused by the diffusing plate 30 so as to obtain nearly uniform luminance all over the light transmitting part 26. Since all the light emitted from the light emitting element 23 is emitted into the light transmission plate 22, the optical coupling efficiency and light utilization efficiency are enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device, and a liquid crystal display device, a mobile terminal device, a vehicle-mounted device and an optical recognition device using the lighting device.

[0002]

2. Description of the Related Art Surface light source devices used as a backlight light source of a liquid crystal display device include a direct type surface light source device and an edge light type surface light source device.

(Direct type surface light source device) Direct type surface light source device 1
As shown in FIGS. 1A and 1B, the diffusion plates 2a and 2b are
Behind the light source 3 such as a fluorescent tube provided on the back of the reflector
The diffuser plates 2a and 2b diffuse the light emitted from the light source 3 to uniformly emit diffused light from the light emitting surface of the surface light source device 1.

Such a direct type surface light source device 1 is characterized in that a plurality of light sources 3 can be arranged on the back surface of the diffusion plates 2a and 2b, so that high emission brightness can be obtained. However, in order to obtain uniform brightness in the entire surface light source device 1, it is necessary to set the distance between the light source 3 and the diffusion plates 2a and 2b to some extent, so that the surface light source device 1 becomes thick, and as a result, As a result, there is a problem that it hinders the thinness which is a characteristic of the liquid crystal display device.

(Edge Light Type Surface Light Source Device) FIG. 2 is an exploded perspective view of the edge light type surface light source device 6 with a part thereof cut away. The edge light type surface light source device 6 includes a light source 7, a light guide plate 8, a reflection plate 9 and a diffusion plate 10 as light source elements. The light source 7 is disposed on the incident side surface of the optically transparent light guide plate 8. As the light source 7, a light emitting element array in which light emitting diodes are arranged, a fluorescent tube such as a cold cathode tube, or the like is used. A diffusion layer 11 is formed on the lower surface of the light guide plate 8, and a reflection plate 9 is provided below the diffusion layer 11. The diffusion layer 11 is formed by dot-printing a light-diffusing paint or the like by screen printing, and the area ratio of the diffusion layer 11 gradually increases on the side away from the light source 7. A diffusion plate 10 is stacked on the upper surface of the light guide plate 8. The diffusion plate 10 is a synthetic resin sheet or film whose surface is subjected to fine unevenness processing (mat processing, texture processing, satin processing).

Therefore, the light emitted from the light source 7 enters the inside of the light guide plate 8 from the incident side surface. The light in the light guide plate 8 is totally reflected on the upper surface of the light guide plate 8 or directly after it is diffused in the diffusion layer 1.
Only the light that is out of the total reflection condition out of the light that is incident on 1 and is diffused by the diffusion layer 11 and reflected by the diffusion layer 11 is guided by the light guide plate 8.
Is emitted from the upper surface (light emission surface) of the. Further, since the area ratio of the diffusion layer 11 is large on the side far from the light source 7, light is emitted with uniform brightness in the entire light guide plate 8. Then, the light emitted from the upper surface of the light guide plate 8 is diffused by the diffusion plate 10 and uniform brightness is obtained.

In such an edge light type surface light source device 6, since the light source 7 is located on the side surface of the light guide plate 8, there is a feature that the surface light source device can be made thin. Recently, the liquid crystal display device is made thin. With the increasing demand for the liquid crystal display device, a liquid crystal display device using an edge light type surface light source device that can be configured to be relatively thin has become mainstream.

[0008]

However, as the liquid crystal display device is widely used in portable equipment and the like, it is required to be thinner and lower in power consumption. Further, in order to further reduce the thickness of the liquid crystal display device, it is necessary to further reduce the thickness of the edge light type surface light source device that is advantageous in reducing the thickness. To reduce the power consumption of the liquid crystal display device, the surface light source device is required. It is necessary to improve the optical coupling efficiency between the light source and the light guide plate.

Here, in order to make the edge light type surface light source device thinner, consider the optical coupling efficiency between the light source and the light guide plate when a thin light guide plate is used. FIG. 3 shows the light source 7 arranged on the side surface of the light guide plate 8, and FIG. 4 is a partially enlarged view thereof. The optical coupling efficiency between the light source 7 and the light guide plate 8 depends on the projected angle α in the thickness direction of the light guide plate 8 viewed from the light source 7, and the larger the projected angle α, the greater the optical coupling efficiency. This expected angle α
Assuming that the distance between the light source (light emitting point) 7 and the side surface of the light guide plate 8 is L and the plate thickness of the light guide plate 8 is t, is expressed by the following equation as shown in FIG. tan (α / 2) = t / (2L) Therefore, in order to reduce the thickness t of the surface light source device 6, the thickness t of the light guide plate 8 is made thinner (see the conventional light guide plate in FIG.
It can be seen from the equation (shown by the dashed line) that the projected angle α of the light source 7 becomes smaller and the optical coupling efficiency becomes smaller.

Further, when the thickness t of the light guide plate 8 becomes thin, it becomes difficult to process the end surface of the light guide plate 8. When the thickness t of the light guide plate 8 becomes thin, it becomes difficult to align the optical axes of the light source 7 and the side surface of the light guide plate 8, and it becomes difficult to dispose the light source 7 on the side surface of the light guide plate 8 and it becomes difficult to mount the light source 7. .

When the distance L between the light guide plate 8 and the light source 7 is shortened,
Since the expected angle α becomes large, the optical coupling efficiency increases. However, the light source (light emitting point) 7 is covered in some form. For example, the fluorescent tube is covered with a glass tube, and the light emitting diode is covered with a package of molding resin or the like. Moreover, when the light source 7 and the light guide plate 8 are arranged in close contact with each other, they are scratched, so they are usually arranged apart from each other by about 1 mm. Therefore, there is a limit in reducing the distance L between the light source 7 and the light guide plate 8 in order to improve the optical coupling efficiency, which is a limitation in improving the optical coupling efficiency.

Therefore, in order to obtain the optical coupling efficiency above a certain limit, there is a limit to the thinning of the light guide plate and the surface light source device, and the thinning of the surface light source device and low power consumption (high optical coupling efficiency).
Was difficult to achieve.

The present invention has been made in view of the above-mentioned drawbacks of the conventional examples, and an object thereof is to realize a thin surface light source device and a high optical coupling efficiency.

[0014]

DISCLOSURE OF THE INVENTION In the illuminating device according to claim 1, the light emitted from the light emitting element is guided through a plate-shaped light guiding portion provided with a light reflecting means on one of the facing main surfaces, Further, in the illuminating device which emits light from the main surface of the light guide section where the light reflecting means is not provided, the light source section enclosing the light emitting element and the light guide section are continuously formed by a transparent resin body. It is characterized by being formed.

In the present invention, since the light emitting element is enclosed in the light source section integrally formed with the light guide section by the transparent resin body, the light emitted by the light emitting element immediately enters the light guide section. Therefore, the optical coupling efficiency between the light emitting element and the light guide portion is improved. Further, since the light emitting element is sealed in the transparent resin body, a separate assembling work of the light emitting element and the light guide plate is unnecessary, and the mountability of the light emitting element is improved.

According to a second aspect of the present invention, in the illumination device according to the first aspect, the optical axis of the light emitted from the light emitting element of the light source section is substantially perpendicular to the main surface of the light guide section. As a result, at least a part of the main surface of the transparent resin body, which is provided in the vicinity of the end of the light guide section and to which the light emitted from the light emitting element first reaches, is the light emitted from the light emitting element. Is characterized in that the light is reflected toward the inside of the light guide section.

In this embodiment, since the light of the light emitting element is emitted in the direction perpendicular to the main surface of the light guide portion, the light emitting element and the light guide element are guided by the thickness of the light guide portion or the transparent resin body. The optical coupling efficiency of the light section is not easily affected. Further, since at least a part of the transparent resin body is shaped to reflect the light emitted from the light emitting element toward the inside of the light guide section, the light emitted from the light emitting element is efficiently directed to the light guide section. The light coupling efficiency can be further improved, and the optical coupling efficiency is further improved.

Therefore, in the lighting device according to the first or second aspect, the lighting device can be thinned without lowering the optical coupling efficiency between the light emitting element and the light guide section. Further, the assembling property of the lighting device is also improved.

An illuminating device according to a third aspect of the present invention is an illuminating device comprising a light source and a light guide plate which allows light emitted from the light source to enter, guide the light, and emit the light from one of the opposing main surfaces. The light source is arranged so that the light emitted from the light source enters the light guide plate from the main surface.

In the illumination device according to the third aspect, since the light source is arranged so that the light emitted from the light source enters the light guide plate from the main surface, the light source and the light guide plate are guided by the thickness of the light guide plate. The optical coupling efficiency with the light plate is not affected. Therefore, it is possible to reduce the thickness of the lighting device without reducing the optical coupling efficiency between the light source and the light guide plate.

According to a fourth aspect of the present invention, in the illumination device according to the third aspect, a portion of the light guide plate facing the main surface on which the light from the light source is incident is adapted to detect the light incident on the light guide plate. The light guide plate is characterized in that the light guide plate has a shape that reflects the light toward the light emission region.

In this embodiment, since the light guide plate is provided with a shape that reflects the light entering the light guide plate toward the light emission region of the light guide plate, the light emission efficiency of the illuminating device can be improved. You can

According to a fifth aspect of the present invention, in the illumination device according to the third aspect, the main surface for guiding the light emitted from the light source into the inside of the light guide plate emits the light in the light guide plate to the outside. The main surface is the same as the main surface.

According to a sixth aspect of the present invention, in the illumination device according to the third aspect, the main surface for guiding the light emitted from the light source into the inside of the light guide plate emits the light in the light guide plate to the outside. It is characterized in that it is the main surface opposite to the main surface.

The main surface for guiding the light of the light source to the inside of the light guide plate may be the same main surface as the light emitting surface or the opposite main surface as described in claim 5 or 6. Good.

According to a seventh aspect of the present invention, in the illumination device according to the third aspect, the light source is a light emitting diode positioned on the light guide plate via a spacer.

By using a light emitting diode as a light source, the lighting device can be reduced in power consumption.

An eighth aspect of the present invention is a liquid crystal display device comprising a liquid crystal display panel and the illuminating device according to the first or third aspect arranged on the back surface of the liquid crystal display panel.

According to the illuminating device of the present invention, the illuminating device can be made thin without deteriorating the optical coupling efficiency. Therefore, by using the illuminating device in a liquid crystal display device, the liquid crystal display device can be made thin and consumes little power. Electricity can be saved.

A mobile terminal device according to a ninth aspect is characterized by including the liquid crystal display device according to the eighth aspect.

An on-vehicle device according to a tenth aspect is characterized by including the illumination device according to the first or third aspect or the liquid crystal display device according to the eighth aspect.

An optical recognition device according to an eleventh aspect includes the illumination device according to the first or third aspect for irradiating the display information with light, and the light receiving means for receiving the reflected light from the display information. It is characterized by having.

The lighting device and the liquid crystal display device of the present invention can be applied to portable terminal equipment such as a portable handset and a portable information processing device, in-vehicle equipment such as a display panel and a high mount stop lamp, and an optical recognition device. By using it, the feature can be utilized.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 5 is a schematic sectional view showing an illuminating device (surface light source device) 21 according to an embodiment of the present invention. In this lighting device 21, the light guide plate 22 made of a transparent resin body such as methacrylic resin is a light source unit 24 in which one or more light emitting elements 23 such as light emitting diodes are sealed.
And a light guide section 26 for confining the light R emitted from the light source section 24 and emitting the light R from the light emitting surface 25 on the upper surface. Here, the light emitting element 23 is preferably a small component such as a light emitting diode with low power consumption. Also,
As the light emitting element 23 insert-molded in the light guide plate 22 made of a transparent resin body, the light emitting element 23 with the light emitting element chip exposed may be insert molded in the light source section 24. The light emitting element 23 sealed with resin may be insert-molded in the light source section 24.

The light source section 24 is formed at the side end of the light guide plate 22, and the light emitting element 23 has its optical axis substantially parallel to the light exit surface 25 of the light guide plate 22 and the light exit direction is toward the light guide section 26 side. The leads 27 are exposed to the outside of the light guide plate 22. A diffusion layer 28 is provided on the lower surface of the light guide plate 22, and a reflection plate 29 is provided below the diffusion layer 28. The diffusion layer 28 is formed by dot-printing a light-diffusing paint or the like by screen printing,
The area ratio of the diffusion layer 28 gradually increases on the side away from the light source section 24. Alternatively, the diffusion layer 28 may be the light guide plate 2
It may be an uneven portion provided on the lower surface of No. 2, and in this case as well, the diffusion layer 28 becomes wider as the distance from the light source 23 increases.

Therefore, as shown in FIG.
When the light R is emitted from 3 toward the light guide portion 26 side, the light R entering the light guide portion 26 is totally reflected by the upper surface of the light guide portion 26 or the reflection plate 29 on the lower surface of the light guide plate 22. And light guide plate 2
2 Of the light R reflected by the upper surface or directly incident on the diffusion layer 28, diffused by the diffusion layer 28, and reflected from the diffusion layer 28, only the light that is out of the total reflection condition is incident on the light guide section 26. The light is emitted from the light emitting surface 25 (upper surface). Also, the diffusion layer 2
Since the area ratio of 8 is large on the side far from the light source section 24, light is emitted with uniform brightness throughout the light guide plate 22.

Above the light guide plate 22, a diffusion plate 30 is provided.
Are arranged. The diffuser plate 30 is a synthetic resin sheet or film whose surface is subjected to fine unevenness processing (mat processing, texture processing, satin processing). The light emitted from the upper surface of the light guide plate 22 is diffused by the diffuser plate 30, and a substantially uniform brightness is obtained over the entire light guide portion 26.

Although not shown in FIG. 5, the diffusion plate 3
A condenser lens plate composed of a large number of triangular prism patterns or the like may be arranged above or below 0. Further, a reflection plate may be provided on the outer peripheral surface of the light guide plate 22 to enhance the light confinement effect.

According to the lighting device 21 having such a structure,
Since all the light emitted from the light emitting element 23 is emitted into the light guide plate 22, the optical coupling efficiency and the light utilization efficiency are very high. Therefore, the lighting device 21 can be operated with low power.
The surface brightness of can be increased. In addition, the light emitting element 2
Since 3 is enclosed in the light guide plate 22, the optical coupling efficiency between the light emitting element 23 and the light guide plate 22 is not affected by the plate thickness of the light guide plate 22 unlike the conventional edge light type surface light source device. Therefore, it becomes possible to manufacture a thin lighting device 21 with high light utilization efficiency.

If the light emitting element 23 is set in the molding die when the light guide plate 22 is molded, the light emitting element 23 can be easily insert-molded into the light source section 24. The implementation method of will be simple. further,
Since the light source (light emitting element 23) and the light guide section 26 are integrated, the assembly process of the lighting device 21 is simplified, which contributes to mass production and cost reduction. Further, the light emitting element 2 used
As 3, a chip whose chip is exposed without being sealed with a molding resin can be used, so that the cost of the light source can be reduced. Furthermore, since the light emitting element 23 is inserted in the light guide plate 22, it is also resistant to dust and dirt.

(Second Embodiment) FIGS. 6 and 7 are a perspective view and a partially broken sectional view showing an illuminating device 31 according to another embodiment of the present invention. In FIG. 6, the diffuser plate 30 and the reflector plate 29 are not shown (the diffuser plate 30 and the reflector plate 29 may be omitted in other embodiments described below). In this lighting device 31,
The light source section 24 is provided on the upper surface of the end portion of the light guide plate 22. The light emitting element 23 is insert-molded in the light source section 24 so that the light emission direction is perpendicular to the main surfaces (upper surface and lower surface) of the light guide plate 22. Further, at the end of the light guide plate 22, a reflection surface 32 is formed in a shape in which the lower portion of the light emitting element 23 is obliquely cut.

Thus, the light R is emitted from the light emitting element 23 toward the lower reflecting surface 23, and the light R emitted from the light emitting element 23 is totally reflected by the reflecting surface 32, and then, the light guide portion 26.
After being confined by the light guide portion 26, the light is emitted to the outside from the light emitting surface 25 on the upper surface. Now, the inclination angle θ of the reflecting surface 32 is set to 45 °, and the material of the light guide plate 22 has a refractive index n =
Assuming PMMA (methacrylic resin) of 1.49, the total reflection critical angle Θ is Θ = sin ⁻¹ (1 / n) = sin ⁻¹ (1 / 1.49) ≈42 °. Therefore, the expected angle β from the light emitting element 23 is as shown in FIG.
Therefore, β = (90 ° −θ) + 45 ° = 93 °.

By the way, in the case of the conventional edge light type surface light source device (see FIG. 4), the thickness t of the light guide plate 8 is set to 0.
Assuming that the distance L between the light source 7 and the light guide plate 8 is 8 mm, the projected angle α from the light source is α = 2 × tan ⁻¹ [0.8 / (1 × 2)] ≈44 °. Therefore, according to the configuration of this embodiment, the light source 23
Since the expected angle β seen from is larger than the conventional example,
Optical coupling efficiency is increased. As shown by the broken line in FIG. 7, light incident on the reflecting surface at an incident angle smaller than the total reflection angle is prevented from escaping to the outside of the light guide plate 22 and the optical coupling efficiency is further increased. A metal vapor deposition film or a dielectric multilayer thin film may be added to the reflecting surface 32.

According to the lighting device 31 having such a structure,
Since the light emitting element 23 can be insert-molded in the light guide plate 22, the mounting of the light emitting element 23 can be facilitated, and moreover, the width D of the light source section 24 can be changed to the thickness t of the light guide plate 22.
Therefore, even if the thickness of the light guide plate 22 is thin, the mounting position accuracy of the light emitting element 23 is not required to be high, and the assembling property of the lighting device 31 is improved. Further, even if the thickness of the light guide plate 22 is reduced, the light utilization efficiency of the light emitting element 23 does not decrease, so that a thin lighting device having high surface brightness can be manufactured.

(Third Embodiment) FIGS. 8 and 9 are a perspective view and a sectional view showing an illumination device 33 according to still another embodiment of the present invention. In the lighting device 33, the reflecting surface 32 formed below the light emitting element 23 enclosed in the light source section 24 has an arc surface shape. In this embodiment, since the reflecting surface 32 has an arcuate surface shape, the reflecting surface 32 can act as a concave mirror to direct the light R toward the light guide portion 22 while condensing the light rays. It is possible to reach the end portion away from 24, and the luminance distribution of the lighting device 33 can be made uniform.

(Fourth Embodiment) FIG. 10 shows an illuminating device 34 according to still another embodiment of the present invention, which is curved outside the obliquely inclined reflecting surface 32 in a circular arc shape with a space 35 therebetween. The reflecting plate 29 is provided. According to this embodiment, the light leaking from the reflecting surface 32 (the light as shown by the broken line in FIG. 7) is reflected by the reflecting plate 29, and then is again guided by the light guide plate 2.
2 is incident. Therefore, the light utilization efficiency of the light source can be improved. In addition, the bending of the reflection plate 29 allows light to reach the side away from the light source unit 24, and the luminance distribution of the lighting device 34 can be made uniform.

(Fifth Embodiment) FIG. 11 is a partially cutaway sectional view showing an illuminating device 36 according to still another embodiment of the present invention. In this embodiment, the package type light emitting element 23 in which the light emitting element chip 37 is sealed with the molding resin 38 is inserted into the light source section 24 of the light guide plate 22.

FIG. 12 is a partially cutaway sectional view showing a method of manufacturing the light guide plate 22 by insert-molding the light emitting element 23 in the transparent resin. 39a and 39b are molding dies for molding the light guide plate 22, and 40 is a cavity for molding the light guide plate 22. The light emitting element 2 is provided on the mold opening surface 41 between the upper mold 39a and the lower mold 39b of the molding die.
After holding the light emitting element 23 at a predetermined position with the lead 27 of No. 3 interposed, the light guide plate 22 is molded by injecting the molding resin into the cavity 40, and at the same time, the light emitting element 23 is insert-molded in the light source section 24. To be done.

(Sixth Embodiment) FIG. 13 is a perspective view showing an illuminating device 42 according to still another embodiment of the present invention. In this embodiment, the light guide plate 22 having a flat plate shape is used.
The light source 43 is arranged at the end of the light emitting surface 25 formed on the upper surface of the. A diffusion layer 28 is formed on the lower surface of the light guide plate 22. The light source 43 includes, for example, the light emitting element 4 on the substrate 44.
5 is implemented. Further, a diffusion plate 30 is arranged on the upper surface side of the light guide plate 22, and a reflection plate 29 is arranged on the lower surface side.

Therefore, even in this lighting device 42,
As shown in FIG. 14, the light R emitted from the light source 43 is emitted from the upper surface of the light guide plate 22 (the end of the light emitting surface 25).
The light is incident on the inside and totally reflected inside the light guide plate 22 to be confined inside the light guide plate 22. Of the light R trapped in the light guide plate 22, the light R that does not satisfy the condition of total reflection is emitted upward from the light emitting surface 25. Then, it is diffused by the diffusion plate 30 and illuminated with uniform brightness.

In this illumination device 42, the light guide plate 22
Although the light source 43 and the light source 43 are formed separately, the light source 43 can be easily mounted by disposing the light source 43 at the upper end of the main surface. That is, as in the conventional case, the light guide plate 22
When the light source 43 is arranged so as to face the side end surface of the
Must be located within the thickness of the light guide plate 22, and it becomes difficult to align the optical axes of the light source 43 and the light guide plate 22, but the light source 43 is arranged on the main surface of the light guide plate 22 as in the present embodiment. Then, as can be seen from FIG. 14, the positional accuracy of the light source 43 is not strictly limited. Therefore, the mounting accuracy of the light source 43 on the light guide plate 22 becomes gentle, and the assembly of the lighting device 42 can be facilitated. In addition, the light guide plate 22 can be thinned without sacrificing the optical coupling efficiency and the assemblability, and the lighting device can be made thinner.

(Various light emitting elements) FIGS. 15 (a) and 15 (b)-
FIG. 18 is a diagram showing various light emitting elements 45 used for the light source 43 on the light guide plate 22. The light emitting element 45 shown in FIGS. 15A and 15B is a small light emitting diode for surface mounting, and a light emitting diode chip 47 mounted on a substrate 46.
Is molded with a molding resin 48, and external electrodes 49 are provided on both side ends of the substrate 46, respectively.

FIG. 16 shows a lead frame 50.
The light emitting diode chip 47 is mounted on the top of the chip 4 and
7 and the other lead frame 51 are connected by a bonding wire 52, and a light emitting diode chip 47 is sealed in a resin lens 53 to form a stem type or lead frame type light emitting element 45.

In the structure shown in FIG. 17, the light emitting diode chip 47 is encapsulated in an epoxy resin 54, and an epoxy resin 5 is formed.
4 is a plane emission type light emitting element 45 in which a light scattering agent 55 having a large specific gravity is settled on the tip surface of No. 4. The light-scattering agent 55 is obtained by allowing the light-scattering agent 55 to settle before the epoxy resin 54 is cured when the light-emitting diode chip 47 is sealed with the epoxy resin, and the light is scattered only on the surface of the light-emitting element 45. Therefore, the uniformity of light is good and high brightness is obtained.

In the structure shown in FIG. 18, the light emitting layer 56 and the insulating layer 57 are sandwiched between the front surface electrode 58 and the back surface electrode 59,
Further, the package film 6 is provided through the moisture absorption film 60.
In the planar light emitting element 45 sealed inside 1, the light emitting layer 56 emits light when a voltage is applied from the electrode lead 62. By using such a planar light emitting element 45, the lighting device can be made thinner.

(Seventh Embodiment) Various fixing methods of the light source 43 in the illumination device in which the light source 43 is mounted on the light guide plate 22 as shown in FIG. 13 or 14 will be described below. FIG.
In the lighting device 63 shown in FIGS. 9 and 20, a plurality of bare chip light emitting diode chips 47 are mounted on the substrate 44,
Each light emitting diode chip 47 is made of transparent molding resin 6
A light emitting element 45 is formed by sealing with 4. Light guide plate 22
A hemispherical recess 65 that is slightly larger than the light emitting element 45 is provided on the upper surface of the end portion of the light source 43, and the light source 43 is mounted on the upper surface of the end portion of the light guide plate 22 via a spacer 66. The light source 43 is mounted with the light emitting element 45 facing downward, the portion of the substrate 44 is supported by the spacer 66, and a resin 67 (for example, an ultraviolet curable resin) is provided between the light emitting element 45 and the recess 65. It is filled.

Here, since the concave portion 65 is formed in the light guide plate 22 so as to face the light emitting element 45, the light in the peripheral portion emitted from the light emitting element 45 is less likely to be totally reflected by the light guide plate 22, and the light source 43. The optical coupling efficiency between the light guide plate 22 and the light guide plate 22 can be further improved. Further, since the concave portion 65 is larger than the light emitting element 45, high accuracy is not required for positioning the light source 43. Moreover, since the light source 43 is arranged on the upper surface of the end portion of the light guide plate 22, the concave portion 65 can also be provided on the upper surface of the light guide plate 22, and the processing of the concave portion 65 becomes easy.

Further, below the light source 43, since the arcuate reflecting surface 32 is provided on the outer surface of the light guide plate 22, the light emitted downward from the light source 43 is reflected by the reflecting surface 32. Thereby, the light is condensed in a direction parallel to the main surface of the light guide plate 22 to facilitate the light to reach the side far from the light source 43.

Between the concave portion 65 and the light emitting element 45,
There is no problem even if the space is not filled with the resin 67.

(Eighth Embodiment) FIG. 21 shows a further illumination device 68, in which a protective frame (spacer) 69 and a plate-shaped light source 43 are superposed on the light guide plate 22.
The diffusion plate 30 is fitted into the openings 70 and 71 provided in the protective frame 69 and the light source 43. That is, the substrate 44 of the light source 43 is composed of an element mounting portion 72 to which the light emitting element 45 is attached and a frame portion 73 provided with an opening 71 for fitting the diffusion plate 30. Light guide plate 2
The protective frame 69 inserted between the light source 43 and the light source 43 is made of transparent resin,
The protective frame 69 is made of an opaque resin, a metal plate, or the like, and the protective frame 69 supports the element mounting portion 72 of the light source 43.
4 and a frame 75 provided with an opening 70 for fitting the diffusion plate 30 therein, and a through hole 76 for housing the light emitting element 45 is opened in the supporting portion 74.

Then, as shown in FIG. 22, the light guide plate 2
2 and the protection frame 69 on top of it, and the light source 43 on the protection frame 69.
And stack the light emitting element 45 in the through hole 76 of the protective frame 69,
The light emitting element 45 is opposed to the main surface of the light guide plate 22. Further, the diffusion plate 30 is housed in the openings 70 and 71 of the protective frame 69 and the light source 43. Here, the plate thickness of the protective frame 69 is larger than the protruding length of the light emitting element 45, and the light source 43
There is a gap between the light guide plate 22 and
In the protective frame 69, the light source 43 (resin portion on the surface) is the light guide plate 22.
Protects against touching and damaging. Further, by using such a protective frame 69, the light source 43 and the diffusion plate 30
Can be easily positioned, and the assembling property of the lighting device 68 is improved.

(Ninth Embodiment) FIG. 23 is a partially cutaway sectional view showing an illumination device 77 according to still another embodiment of the present invention. In this embodiment, the through hole 76 of the protective frame 69 is opened in a taper shape, and the light emitting element 45 of the light source 43 placed thereon is exposed to the through hole 76 of the protective frame 69. Is. By forming the through holes 76 in a tapered shape in this way, the spread of light entering the light guide plate 22 from the light source 43 can be increased, so that the light spread in the light guide plate 22 is also increased, and the light emission surface of the illumination device 77 is increased. The brightness is made more uniform as a whole.

If the inner peripheral surface of the through hole 76 is a mirror surface, the light reflected by the inner peripheral surface of the through hole 76 will be the light guide plate 2.
The light utilization efficiency can be further improved. Specifically, the inner peripheral surface of the through hole 76 of the metal plate protective frame 69 is mirror-polished, or a mirror surface is formed on the inner peripheral surface of the through hole 76 of the resin protective frame 69 with an aluminum deposition film or the like. Good.

(Tenth Embodiment) FIG. 24 is a partially cutaway sectional view showing an illumination device 78 according to yet another embodiment of the present invention. In this embodiment, a protective frame 69 made of a transparent resin or a semitransparent resin is used.
At least the inner peripheral surface of each of the through holes 76 of 9 is provided with a light-shielding surface 79. When the transparent or semi-transparent protective frame 69 is used, stray light that passes through the protective frame 69 and enters the diffusion plate 30 can be eliminated by performing a light-shielding treatment on the inner peripheral surface and the periphery of the through hole 76. . Further, by performing a light-shielding process also on the lower surface of the protective frame 69, light escaping from the light guide plate 22 to the protective frame 69 can be blocked, and the light utilization efficiency of the lighting device 78 can be improved.

(Eleventh Embodiment) FIGS. 25 and 26 show another embodiment of the present invention. The light source 43 used in this lighting device is a substrate 44 having a function of a protective frame. That is, the recess 80 is provided on the lower surface of the element mounting portion 72 of the plate-shaped substrate 44, and the light emitting element 45 is provided on the inner surface of the recess 80. Here, the depth of the recess 80 is larger than the height of the light emitting element 45 so that the light emitting element 45 does not protrude beyond the lower surface of the substrate 44.

When the light source 43 is directly stacked on the light guide plate 22, the light emitting element 45 is retracted into the recess 80 and does not directly touch the light guide plate 22, so that the light emitting element 45 is not damaged. Protected by. Also, the diffusion plate 3
0 is positioned by the frame portion 73 of the light source 43.
In this embodiment, the number of parts can be reduced and the number of assembling steps can be reduced as compared with the embodiment of FIG.

(Twelfth Embodiment) FIG. 27 shows another embodiment of the present invention. The diffusion plate 30 used in this lighting device has a function of a protective frame. The diffusion plate 30 has a light source 43 (or a light source 43 at the end of a thin light diffusion portion 81 that functions as a diffusion plate).
The support portion 82 for supporting the element mounting portion 72) is provided. The light source 4 placed on the support portion 82 of the diffusion plate 30.
3 is positioned so that the light emitting element 45 is accommodated in the through hole 83 of the support portion 82. Also according to this embodiment, since the number of parts can be reduced, the number of assembling steps can also be reduced.

(Thirteenth Embodiment) FIGS. 28 and 29 are an exploded perspective view and a partially broken sectional view showing an illumination device 84 according to still another embodiment of the present invention. In this illuminating device 84, stepwise notches 85 are provided on the upper surface of the end portion of the light guide plate 22, and a strip-shaped protective frame 69 is placed on the light guide plate 22 so as to fit in the notches 85. Protective frame 69
The light source 43 is placed on the above. According to such a structure, the light source 43 does not project to the upper surface of the illumination device 84,
The lighting device 84 can be made thinner overall. Further, since the light source 43 does not project, dust and dust are less likely to adhere to the light source 43. Furthermore, at the time of assembly, the protective frame 69
The light source 43 and the light source 43 can be positioned by the notches 85, so that the illumination device 84 can be easily assembled.

(Shape of Through Hole of Protective Frame) Here, the protective frame 6
As shown in FIG. 30, each individual light emitting element 4
5, the light emitting elements 45 are aligned with the through holes 76 so that the light source 4 can be used.
3 can be placed on the protective frame 69, and the light source 43 can be easily mounted. Further, even when the light source 43 having a plurality of individual light emitting elements 45 is mounted on the protective frame 69, one through hole 76 may be provided in the entire light emitting element 45 as shown in FIG. Also in this case, if both ends of the through hole 76 are matched with the shape of the light emitting element 45, the light emitting elements 45 at both ends can be positioned in the through hole 76, whereby the light emitting element 45 can be positioned in the through hole 76. Therefore, the weight of the protective frame 69 can be reduced without lowering the positioning accuracy of the light emitting element 45. Further, when the light source 43 is composed of one rectangular light emitting element 45, one rectangular through hole 76 may be provided in the protective frame 69 as shown in FIG.

(Fourteenth Embodiment) FIG. 33 shows still another embodiment of the present invention. In this embodiment, in the lighting device 86 in which the light source 43 is placed on the band-plate-shaped protection frame 69 as shown in FIGS. 30 to 32, the light guide plate 22 has a hemispherical shape facing the light emitting elements 45. A concave portion 87 is provided. Also in this embodiment, the light source 43 that is totally reflected on the surface of the light guide plate 22 as in the embodiment of FIGS. 19 and 20.
It is possible to reduce the light emitted from the light source and improve the optical coupling efficiency between the light source 43 and the light guide plate 22.

(Fifteenth Embodiment) FIG. 34 shows still another embodiment of the present invention. In this embodiment, the light source 43 is placed on a band-plate-shaped protective frame 69 as shown in FIGS.
In the illuminating device 88 on which is mounted, a Fresnel lens pattern-shaped recess 89 is provided in the light guide plate 22 so as to face each light emitting element 45. Also in this embodiment, as in the embodiment of FIG. 33, the light from the light source 43 totally reflected on the surface of the light guide plate 22 is reduced, and the light source 43 and the light guide plate 22 are reduced.
And the efficiency of optical coupling with the substrate can be improved. Moreover, in this embodiment, the Fresnel lens pattern concave portion 89 is formed.
Therefore, the recess 89 can be made shallower, which contributes to the thinning of the light guide plate 22.

(Sixteenth Embodiment) FIG. 35 shows still another embodiment of the present invention, in which the light source 43 is placed on a band-plate-shaped protective frame 69 as shown in FIGS. In the illumination device 90 described above, the light guide plate 22 is provided with a recess 87 facing each light emitting element 45, and the lower surface side thereof is curved in a parabolic shape to form the reflection surface 32. In this embodiment, the recess 87 improves the optical coupling efficiency between the light source 43 and the light guide plate 22, and the parabolic reflection surface 32 is provided.
Thus, the light incident on the end of the light guide plate 22 can be guided to the end opposite to the light source 43, and the luminance distribution can be made uniform.

(Seventeenth Embodiment) FIG. 36 shows an illuminating device 91 according to still another embodiment of the present invention. In this embodiment, a hemispherical recess 87 is provided on the upper surface of the end portion of the light guide plate 22, and a reflective surface 92 having a saw-toothed cross section is provided below the lower surface of the light guide plate 22. Since the inclined portion of the reflecting surface 92 is inclined so as to become deeper on the end side where the light source 43 is provided, when the light entering the light guide plate 22 from the recess 87 is totally reflected by the reflecting surface 92, The light is reflected toward the end opposite to the light source 43, and the light can reach the end opposite to the light source 43. Moreover, if the reflecting surface 92 having a saw-toothed cross section is used, it is possible to facilitate processing as compared with the reflecting surface 32 having a parabolic shape.

(Eighteenth Embodiment) FIG. 37 shows an illuminating device 93 according to still another embodiment of the present invention. In this embodiment, the Fresnel lens pattern recess 89 is formed.
With the reflecting surface 92 having a saw-toothed cross section, the light coupling efficiency of the light source 43 and the light guiding plate 22 can be improved while reducing the thickness of the light guiding plate 22, and the unevenness of the luminance distribution can be reduced by simple processing. be able to.

(Nineteenth Embodiment) FIG. 38 shows an illumination device 94 according to still another embodiment of the present invention, in which a protective frame 69 is adhered to the upper surface of the end portion of the light guide plate 22 by an adhesive layer 95, and The light source 43 is adhered onto the protective frame 69 by the adhesive layer 95.

(Twentieth Embodiment) FIG. 39 shows an illumination device 96 according to still another embodiment of the present invention, in which a light source is provided on the upper surface of the end portion of the light guide plate 22 via a protective frame 69 coated with an adhesive 97. 43 is fixed.

(Twenty-first Embodiment) FIG. 40 is a partial sectional view showing an illumination device 98 according to yet another embodiment of the present invention. In this embodiment, the protective frame 69
A transparent UV curable resin 99 is filled between the light source 43 and the light guide plate 22 which are overlapped on the upper surface of the end portion of the light guide plate 22 via, and the UV curable resin 99 is irradiated with ultraviolet rays through the light guide plate 22, for example. The light source 43 is fixed on the light guide plate 22 by curing. If the light source 43 is fixed by such a method, the light source 43 can be easily mounted and the resin curing time can be shortened. Moreover, since the entire lower surface of the light source 43 is bonded, the fixing strength of the light source 43 is increased.

(22nd Embodiment) FIG. 41 shows an illuminating device 100 according to still another embodiment of the present invention, in which a light source 43 is fixed by using a molding resin of a light emitting element 45. That is, the molding resin 38 is potted on the substrate 43 on which the light emitting element chip 37 is mounted, and the substrate 44
The light emitting element chip 37 is housed in the through hole 76 of the protective frame 69 before the molding resin 38 is cured with the side facing back. As a result, the protective frame 69 and the recess 87 of the light guide plate 22 are filled with the molding resin 38, and when the molding resin 38 is cured, the molding resin 38 seals the light emitting element chip 37 with the molding resin 38. At the same time, the light source 43 is fixed by the molding resin 38. According to such a method, the light emitting element 45 can be resin-molded and fixed to the light guide plate 22 at the same time, so that the manufacturing process of the lighting device 100 can be simplified.

(23rd Embodiment) FIGS. 42A and 42B.
FIG. 6 is a partially cutaway sectional view showing an assembling procedure of a lighting device 101 according to still another embodiment of the present invention. In this embodiment, the protrusion 102 is provided on the upper surface of the end portion of the light guide plate 22 before the light source is attached. The light source 43 is superposed on the protrusion 102 and heat is applied to the protrusion 102 from above the light source 43. In addition,
The projection 102 of the light guide plate 22 is thermocompression bonded to the light source 43 to fix the light source 43. According to this method, since the protective frame 69 is unnecessary, the number of parts can be reduced and the number of assembling steps can be reduced. Further, the illumination device 101 can be made thinner by the amount that the protection frame 69 is unnecessary.

(Twenty-fourth Embodiment) FIG. 43 is a partially cutaway schematic sectional view showing a liquid crystal display device 103 using an illuminating device 104 according to still another embodiment of the present invention. In this liquid crystal display device 103, a liquid crystal display panel 105 is stacked on a lighting device (surface light source device) 104 with a polarizing plate (not shown) and the like, and the lighting device 104 and the liquid crystal display panel 105 are separated from each other. The frame 106 is connected and integrated.
In the lighting device 104, the light source 43 is placed on the upper surface of the end portion of the light guide plate 22 via the protective frame 69 or directly. The liquid crystal display panel 105 includes two glass substrates 10 on which transparent electrodes, color filters, TFTs, etc. are formed.
A liquid crystal material is sealed between 7 and 108. The glass substrate 107 on the lower surface side of the liquid crystal display panel 105
Is cut out at the end corresponding to the light source 43, and the light source 43 is formed by cutting the glass substrate 107.
It is paid in 9. Therefore, it is possible to prevent a large gap from being generated between the lighting device 104 and the liquid crystal display panel 105 due to the light source 43 arranged on the upper surface of the light guide plate 22, and to make the liquid crystal display device 103 thinner. it can.

(Twenty-fifth Embodiment) FIG. 44 is an embodiment showing a method for connecting the liquid crystal display panel 105 and an external circuit. In this liquid crystal display device 110, the external circuit connecting line 11
The liquid crystal display panel 10 is provided by the clip portion 112 provided at one end.
The end of the external circuit connecting wire 111 is fixed to the glass substrate 108 by holding the end of the glass substrate 108 of 5,
The external circuit connection line 111 is electrically connected to the liquid crystal display panel by the clip portion 112 fixed to the glass substrate 108.

(Twenty-sixth Embodiment) FIG. 45 is an embodiment showing another power supply method to the light source 43. In the liquid crystal display device 113, the flexible wiring 11 is formed on the circuit pattern (not shown) formed on the glass substrate 108 on the upper surface side.
By connecting No. 4, the liquid crystal display panel 105 is connected to the external circuit.

(Twenty-seventh Embodiment) FIG. 46 is a partially cutaway sectional view showing a liquid crystal display device 115 according to still another embodiment. In this embodiment, the end of the glass substrate 107 on the lower surface side of the liquid crystal display panel 105 is cut out, and the light source 43 is attached to the lower surface of the glass substrate 108 on the upper surface side in the cutout portion 109. An LED driver circuit for causing the light emitting element 45 to emit light and a driver circuit for a liquid crystal display panel are mounted on the substrate 44 of the light source 43, and the substrate 44 and the liquid crystal display panel 105.
Are electrically connected via a conductive film 116 (TCP method). Then, when the liquid crystal display panel 105 is stacked on the illumination device 104, the light source 43 fixed to the liquid crystal display panel 105 is placed on the protective frame 69 arranged on the upper surface of the end portion of the light guide plate 22.

In this embodiment, however, the light guide plate 22
The light source 43 can be attached above the light guide plate 22 by stacking the liquid crystal display panel 105 on the above, and the number of assembling steps of the liquid crystal display device 115 can be significantly reduced. Further, since the light source 43 is housed in the cutout portion 109 of the glass substrate 107, the liquid crystal display device 115 can be thinned.

(Twenty-eighth Embodiment) FIG. 47 is a partially cutaway sectional view showing a liquid crystal display device 117 according to still another embodiment. In this embodiment, an end portion of the glass substrate 107 on the lower surface side of the liquid crystal display panel 105 is cut out, and the light source is formed on the circuit pattern 118 formed on the lower surface of the glass substrate 108 on the upper surface side in the cutout portion 109. 43 and a driver LSI (integrated circuit) 119 are mounted (COG method). When the liquid crystal display panel 105 is placed on the lighting device 104, the liquid crystal display panel 1
The light source 43 fixed to 05 is placed on the protective frame 69.

Also in this embodiment, the light source 43 can be attached above the light guide plate 22 by stacking the liquid crystal display panel 105 above the light guide plate 22, and the number of assembling steps of the liquid crystal display device 117 can be greatly reduced. Can be made. Further, since the light source 43 is housed in the cutout portion 109 of the glass substrate 107, the liquid crystal display device 117 can be thinned.

Although not shown, the liquid crystal display panel 10
As a method of connecting 5 and an external circuit, there is a method using a bomb connector.

(Twenty-ninth and Thirtieth Embodiments) FIG. 48 and subsequent drawings are diagrams showing a method of using the liquid crystal display device according to the present invention. FIG. 48 shows a portable handset 120 such as a mobile phone or a low power radio device. This mobile handset 120
Includes a button 121 for inputting a dial and a frequency, an antenna 122, a display section 123 for displaying a destination dial and a frequency, and the like.
Is composed of the liquid crystal display device of the present invention.

Further, FIG. 49 shows a portable information processing device 124 such as an electronic notebook or a calculator, which has an input unit 125.
The liquid crystal display device of the present invention is used for the display unit 126.

Since these devices are portable and driven by a battery, they are required to be lightweight and thin and to save power, and are optimal for using the liquid crystal display device of the present invention.

(Thirty-first and thirty-second embodiments) FIG. 50 shows a display panel 127 of an in-vehicle air conditioner.
The liquid crystal display device of the present invention is used. Further, what is shown in FIG. 51 is a high mount stop lamp 129 provided on the rear surface of the vehicle body of the automobile 128, which uses the lighting device of the present invention.

In the case of the vehicle-mounted type as well, since it is driven by the vehicle-mounted battery, power saving and cost reduction are required. By using the liquid crystal display device and the lighting device of the present invention for such an in-vehicle device, it is possible to save power and enhance the uniformity of the display and the light emitting surface.

(Thirty-Third and Thirty-Third Embodiments) FIG. 52 shows a one-dimensional information reading device 130 such as a bar code reader, and FIG. 53 shows a two-dimensional information reading device such as an image scanner. 131. As shown in FIG. 54, these optical recognition devices display information 134 provided on the surface of the reading object 133 with the light emitted from the surface light source device 132 using the illumination device of the present invention.
To the mirror 135 and the light receiving lens 1
The light is collected on the light receiving element 137 via the light receiving element 1
The display information 134 is read from the light reception signal generated at 37.

By using the illumination device of the present invention in such an optical recognition device, cost reduction and size reduction can be achieved.

[Brief description of the drawings]

1A and 1B are a front view and a cross-sectional view showing a direct type surface light source device.

FIG. 2 is a schematic exploded perspective view showing an edge light type surface light source device.

FIG. 3 is a schematic side view of an edge light type surface light source device.

FIG. 4 is a diagram illustrating the operation of the above edge light type surface light source device.

FIG. 5 is a schematic cross-sectional view showing the lighting device according to the first embodiment of the present invention.

FIG. 6 is a partially omitted perspective view showing a lighting device according to a second embodiment of the present invention.

FIG. 7 is a partially cutaway sectional view of the above lighting device.

FIG. 8 is a partially omitted perspective view showing a lighting device according to a third embodiment of the present invention.

FIG. 9 is a cross-sectional view of the above illumination device.

FIG. 10 is a sectional view showing an illumination device according to a fourth embodiment of the present invention.

FIG. 11 is a partially cutaway sectional view showing an illuminating device according to a fifth embodiment of the present invention.

FIG. 12 is a partially cutaway cross-sectional view illustrating the method of manufacturing the above illumination device.

FIG. 13 is a partially omitted perspective view showing a lighting device according to a sixth embodiment of the present invention.

FIG. 14 is an operation explanatory view of the above illumination device.

15A and 15B are a perspective view and a cross-sectional view showing an example of a light emitting element used for a light source.

FIG. 16 is a cross-sectional view showing another example of a light emitting element used for a light source.

FIG. 17 is a cross-sectional view showing still another example of the light emitting element used for the light source.

FIG. 18 is a perspective view showing a configuration of a planar light emitting element used for a light source.

FIG. 19 is a partially omitted perspective view of a lighting device according to a seventh embodiment of the present invention.

FIG. 20 is a cross-sectional view of the illumination device of the above.

FIG. 21 is an exploded perspective view showing an illumination device according to an eighth embodiment of the present invention.

FIG. 22 is a partially cutaway sectional view of the above illumination device.

FIG. 23 is a partially cutaway sectional view showing a lighting device according to a ninth embodiment of the present invention.

FIG. 24 is a partially cutaway cross-sectional view showing a lighting device according to a tenth embodiment of the present invention.

FIG. 25 is a perspective view showing a light source and a diffusion plate according to an eleventh embodiment of the present invention.

FIG. 26 is a sectional view of the above light source.

FIG. 27 is a sectional view of a diffusion plate according to a twelfth embodiment of the present invention.

FIG. 28 is an exploded perspective view showing a lighting device according to a thirteenth embodiment of the present invention.

FIG. 29 is a partially cutaway cross-sectional view of the above illumination device.

FIG. 30 is a perspective view showing an example of a protection frame.

FIG. 31 is a perspective view showing another protective frame.

FIG. 32 is a perspective view showing still another protective frame.

FIG. 33 is a partially cutaway cross-sectional view of a lighting device according to a fourteenth embodiment of the present invention.

FIG. 34 is a partially cutaway sectional view of a lighting device according to a fifteenth embodiment of the present invention.

FIG. 35 is a partially cutaway cross-sectional view of a lighting device according to a sixteenth embodiment of the present invention.

FIG. 36 is a partially cutaway sectional view of a lighting device according to a seventeenth embodiment of the present invention.

FIG. 37 is a partially cutaway sectional view of a lighting device according to an eighteenth embodiment of the present invention.

FIG. 38 is a partially cutaway sectional view of a lighting device according to a nineteenth embodiment of the present invention.

FIG. 39 is a partially cutaway cross-sectional view of a lighting device according to a twentieth embodiment of the present invention.

FIG. 40 is a partially cutaway cross-sectional view of a lighting device according to a twenty-first embodiment of the present invention.

FIG. 41 is a partially cutaway sectional view of a lighting device according to a twenty-second embodiment of the present invention.

42 (a) and 42 (b) are partially cutaway sectional views showing the assembling procedure of the lighting device according to the twenty-third embodiment of the present invention.

FIG. 43 is a partially cutaway cross-sectional view showing a liquid crystal display device according to a twenty-fourth embodiment of the present invention.

FIG. 44 is a partially cutaway sectional view showing a liquid crystal display device according to a twenty-fifth embodiment of the present invention.

FIG. 45 is a partially cutaway cross-sectional view showing a liquid crystal display device according to a twenty sixth embodiment of the present invention.

FIG. 46 is a partially cutaway cross-sectional view showing a liquid crystal display device according to a twenty-seventh embodiment of the present invention.

FIG. 47 is a partially cutaway cross-sectional view showing a liquid crystal display device according to a twenty-eighth embodiment of the present invention.

FIG. 48 is a perspective view showing a portable handset according to a 29th embodiment of the invention.

FIG. 49 is a perspective view showing a portable information processing device according to a thirtieth embodiment of the present invention.

FIG. 50 is a perspective view showing a display panel of a vehicle air conditioner according to a thirty-first embodiment of the present invention.

FIG. 51 is a perspective view showing a high mount stop lamp according to a 32nd embodiment of the present invention.

52 is a perspective view showing a one-dimensional information reading device according to a thirty-third embodiment of the present invention. FIG.

FIG. 53 is a perspective view showing a two-dimensional information reading device according to a thirty-fourth embodiment of the present invention.

FIG. 54 is a diagram showing a configuration of an optical recognition device such as a one-dimensional information reading device or a two-dimensional information reading device of the above.

[Explanation of symbols]

 22 Light guide plate 23 Light emitting element 24 Light source section 26 Light guide section 32 Reflective surface 43 Light source 69 Protective frame 120 Portable handset 124 Portable information processing device 127 In-vehicle air conditioner display panel 129 High mount stop lamp 130 One-dimensional information reading Device 131 Two-dimensional information reading device

Claims (11)

[Claims] 1. Light emitted from a light-emitting element is guided through a plate-shaped light guide portion having a light reflection means provided on one surface of opposing main surfaces, and further light reflection means of the light guide portion is provided. In a lighting device that emits light from a main surface on a side not covered with the light, the light source part encapsulating the light emitting element and the light guide part are continuously formed of a transparent resin body. apparatus. 2. The light source section is provided near an end of the light guide section such that an optical axis of light emitted from the light emitting element is substantially perpendicular to a main surface of the light guide section. At least a part of the transparent resin body to which the light emitted from the light emitting element first reaches has a shape that reflects the light emitted from the light emitting element toward the inside of the light guide section. The lighting device according to claim 1. 3. An illumination device comprising a light source and a light guide plate which allows light emitted from the light source to enter, guides the light, and emits the light from one of the facing main surfaces, wherein the light emitted from the light source is An illumination device in which the light source is arranged so as to enter the light guide plate from the main surface. 4. A portion of the light guide plate facing the main surface on which the light from the light source is incident has a shape that reflects the light incident into the light guide plate toward the light emission region of the light guide plate. The lighting device according to claim 3, wherein the lighting device is a lighting device. 5. The main surface for guiding the light emitted from the light source to the inside of the light guide plate is a main surface on the same side as the main surface for emitting the light in the light guide plate to the outside. Item 3. The lighting device according to item 3. 6. The main surface for guiding the light emitted from the light source to the inside of the light guide plate is a main surface opposite to the main surface for emitting the light in the light guide plate to the outside. Item 3. The lighting device according to item 3. 7. The lighting device according to claim 3, wherein the light source is a light emitting diode positioned on the light guide plate via a spacer. 8. A liquid crystal display device comprising a liquid crystal display panel and the illuminating device according to claim 1 arranged on the back surface of the liquid crystal display panel. 9. A mobile terminal device comprising the liquid crystal display device according to claim 8. 10. An in-vehicle device comprising the illumination device according to claim 1 or the liquid crystal display device according to claim 8. 11. An optical recognition device comprising: the illuminating device according to claim 1 for irradiating display information with light; and a light receiving means for receiving reflected light from the display information.