JP2000259087A - Surface illuminator and portable terminal equipment using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface illuminator satisfactory in luminance distribution, satisfactory in visibility and small in size even when the number of used light sources of light emitting diodes or the like is a few and the length of a light transmission part is short. SOLUTION: This illuminator is provided with the light transmission plate 2 provided with an incident plane 3a on which light emitted from light source 1 is made incident, reflection surfaces 3b reflecting light entering from the incident plane 3a and a light releasing part 4 for releasing light which is reflected on the reflection surfaces 3b and came by propergating the inside of the plane in a surface shape and a partition 3b suppressing the light emitted from the light source 1 from entering into the vicinity of the light source 1 of the light transmission plate 2 directly with a light transmission part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface lighting device for illuminating a liquid crystal display device from the back, and more particularly to a surface lighting device using a light source having a small light emitting area such as a light emitting diode.

[0002]

2. Description of the Related Art A surface illumination device used as a backlight of a liquid crystal display device such as a cellular phone or a personal handy phone system uses a point light source using a chip-shaped light emitting diode because of its small size and low power consumption. Have been done. More recently, the display unit of portable terminal devices such as various portable information terminals, digital cameras, video cameras, etc., has a cold-cathode tube in order to reduce the size of the surface illumination device, extend the life of the battery, and improve the impact resistance. Is shifting from light emitting diode light sources to light emitting diode light sources.

[0003] There are various configurations of conventional surface lighting devices using these light emitting diode light sources. For example, as described in Japanese Patent Publication No. 3-32075, a light emitting diode light source for top emission is arranged on the back side of the liquid crystal display, and the light is radiated directly toward the back of the liquid crystal display for illumination. However, due to problems such as the thinness of the device and the installation of electronic circuits on the back of the liquid crystal display element, the backlight of a liquid crystal display such as a mobile phone emits light directly on the back side of this liquid crystal display. There are few diode light sources. On the other hand, as a backlight of a liquid crystal display device such as a mobile phone, a method of arranging a light emitting diode light source outside a display surface of a liquid crystal display element is often used, for example, as described in JP-B-5-21233. As described above, there is known a device in which a light emitting diode light source for top emission is arranged outside the display surface of a liquid crystal unit, and light is guided below the liquid crystal display unit using a reflection surface and a resin plate. Have been.

An example in which a light-emitting diode light source is disposed outside the display surface of a liquid crystal display device as described above will be described with reference to FIGS. 19 and 20 as a conventional surface illumination device. FIG. 19 is a plan view of a conventional surface lighting device, FIG. 20 is a side view of the conventional surface lighting device, and 100 is a light source such as a light emitting diode.
00 is a light guide plate, 300 is a light guide part of the light guide plate 200, 300
a is an incident surface of the light guide 300, 400 is a light emitting part of the light guide plate 200, 500 is a light scattering part formed on the lower surface of the light emitting part 400, 500a is a milky white to white ink light scattering part 50.
Light scattering dots printed at 0, 600 is a storage member for holding the light guide plate 200, and 700 is a reflection surface formed on the storage member 600. Here, the light emitted from the light source 100 is reflected by the reflection surface 700 and then enters the light guide unit 300 of the light guide plate 200 from the incident surface 300a of the light guide unit 300. The light incident on the inside of the light guide section 300 is
00, the light scattering dots 500a of the light scattering portion 500
And is emitted from the upper surface of the light emitting section 400.

However, in the above-described conventional surface illumination device and the like, if the number of light sources 100 is only one in the center of FIG. Are particularly bright, and the vicinity of the portion B tends to be dark. In particular, this luminance distribution becomes remarkable as the area to be illuminated increases. When such a luminance distribution is generated, when used as a backlight of a liquid crystal display element or the like, display characters and the like are difficult to see, and further, a display portion that is dark and cannot be recognized is generated. In order to solve this problem, conventionally, measures have been taken to improve the luminance distribution of the surface illumination device by increasing the number of light sources 100 used and reducing the arrangement intervals of the light sources 100.

[0006]

However, in a liquid crystal display device of a portable terminal device such as a portable telephone, if the number of light sources used in the surface illumination device is increased, not only the power consumption is increased but also the light source related to the mounting of the light source. There is a problem that complexity and an increase in manufacturing cost occur. Therefore, as a method of improving the luminance distribution, there is a method in which the light guide portion of the light guide plate is lengthened and the light is emitted from the light emitting portion after the light is sufficiently diffused. However, this method limits the miniaturization of the entire device. There is a problem that is.

Therefore, the present invention provides a planar lighting device which has a good luminance distribution, a good visibility and a small size even if the number of light sources such as light emitting diodes is small and the length of the light guide portion is short. The purpose is to:

[0008]

In order to solve the above-mentioned problems, a surface illuminating device according to the present invention comprises an incident surface on which light emitted from a light source is incident and a reflecting surface for reflecting light incident from the incident surface. And a light-guiding member having a light-emitting portion for emitting light reflected by the reflecting surface and propagating inside, and suppressing light emitted from the light source from directly entering the light-emitting portion near the light source. And a partition wall.

Also, an incident surface on which light emitted from the light source is incident, a reflecting surface for reflecting light incident from the incident surface, and a light emitting portion for emitting light reflected by the reflecting surface and propagating inside. And a reflecting member for reflecting the light emitted from the light source toward the incident surface of the light guiding member.

Further, an incident surface on which the light emitted from the light source is incident, a reflecting surface for reflecting the light incident from the incident surface, and a light emitting portion for emitting light reflected by the reflecting surface and propagating through the inside are provided. A light guide member provided, a partition wall for suppressing light emitted from the light source from directly entering the vicinity of the light source in the light emitting section, and reflecting light emitted from the light source in the direction of the incident surface of the light guide member. A reflection member is provided.

[0011] Further, display means, conversion means for converting at least one of a data signal or an audio signal into a transmission signal or converting a reception signal into at least one of a data signal or an audio signal, and converting the transmission signal and the reception signal. A portable terminal device including an antenna for transmitting and receiving and a control unit for controlling each unit, wherein the above-described surface illumination device is used below the display unit.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a light source, a light incident surface on which light emitted from the light source is incident, a reflecting surface for reflecting light incident from the incident surface, and the reflecting surface. By providing a light guide member having a light emitting portion that emits light that has been reflected and propagated inside, and a partition wall that suppresses light emitted from the light source to directly enter the light emitting portion. In addition, since the light emitted from the light source can be prevented from directly entering the light emitting unit, it is possible to prevent the vicinity of the light source in the light emitting unit from becoming extremely bright.

According to a second aspect of the present invention, the light emitted from the light source is reflected by the reflection surface of the light guide member and enters the light emitting portion. The light is emitted after the light is sufficiently diffused. Since the light can be made incident on the light emitting portion, the luminance unevenness in the light emitting portion can be further reduced.

According to the third aspect of the present invention, since the surface of the partition wall on the light source side has a reflecting action, and light absorption in the partition wall can be almost eliminated, light use efficiency can be improved.

According to a fourth aspect of the present invention, a part of the light reflected by the partition is reflected by the reflection surface of the light guide portion and is incident on the light emitting portion, thereby improving the light use efficiency. Can be done.

According to a fifth aspect of the present invention, a storage member for storing the light guide member is provided, and the partition is integrally molded with the storage member. Steps such as alignment between light from a light source, alignment between a partition and a storage member, and joining can be eliminated, so that productivity of the surface illumination device can be improved.

According to a sixth aspect of the present invention, there is provided a light source, an incident surface on which light emitted from the light source is incident, a reflecting surface for reflecting light incident from the incident surface, and an interior reflected by the reflecting surface. By providing a light guide member including a light emitting portion that emits light that has propagated, and a reflecting member that reflects light emitted from the light source in the direction of the reflection surface, the light is emitted upward from the light source. Most of the light traveling direction can be converted to the direction of the reflection surface of the light guide member, and most of the light emitted from the light source can be guided to the light guide member, thereby improving the light use efficiency. In addition, since the distribution of light incident on the light emitting portion of the light guide member can be made more uniform, it is possible to realize a surface illumination device with small luminance unevenness and easy for a user to see.

According to a seventh aspect of the present invention, there is provided a storage member for storing the light guide member, wherein the reflection member is integrally formed with the storage member, so that mass productivity can be improved and the reflection can be improved. Steps such as alignment between the member and light from the light source, alignment between the reflection member and the storage member, and joining can be eliminated, so that the productivity of the surface illumination device can be improved.

According to an eighth aspect of the present invention, the reflection member is disposed on the light source, and the cross-sectional shape of the reflection member is substantially V-shaped, and converts the light emitted upward from the light source into a traveling direction. However, the light can be efficiently incident on the light guide member.

According to a ninth aspect of the present invention, the sectional shape of the reflecting member is a concave curved surface, and the light emitted upward from the light source is efficiently incident on the light guide member while changing the traveling direction. be able to.

According to a tenth aspect of the present invention, the shape of the apex of the reflecting member facing the light source is a curved surface or a flat surface, and light near the center of the light source having the highest luminance is more directly transmitted to the light guiding member. Can be suppressed, so that even if the relative position of the light source with respect to the reflecting member is slightly shifted, it is possible to suppress a change in the luminance unevenness in the light emitting portion.

According to the present invention, the light source, an incident surface on which the light emitted from the light source is incident, a reflecting surface for reflecting the light incident from the incident surface, and an interior reflected by the reflecting surface are formed. A light guide member including a light emitting portion that emits light that has propagated, a partition wall that suppresses light emitted from the light source to directly enter the light guide member, and light emitted from the light source. By providing the reflecting member that reflects in the reflecting surface direction, it is possible to convert the traveling direction of most of the light emitted upward from the light source to the in-plane direction of the light guide member,
Since most of the light emitted from the light source can be guided to the light guide member, the light use efficiency can be improved, and the light emitted from the light source can be suppressed from directly entering the light emitting portion. Therefore, it is possible to prevent the vicinity of the light source in the light emitting portion from becoming extremely bright.

According to a twelfth aspect of the present invention, a storage member for storing the light guide member is provided, and the partition wall and the reflection member are integrally molded with the storage member, so that mass productivity can be improved. This eliminates the steps of positioning between the partition wall and the reflecting member and the light from the light source, and positioning between the partition wall and the reflecting member and the storage member, and joining steps. Can be improved.

According to a thirteenth aspect of the present invention, there is provided a light source, an incident surface on which light emitted from the light source is incident, a reflecting surface for reflecting light incident from the incident surface, and an interior reflected by the reflecting surface. A light-guiding member having a light-emitting portion that emits the propagated light, and the high-intensity light near the central axis of the light-emitting intensity of the light source enters the light-emitting portion by being reflected at least twice or more. With such a configuration, while the light emitted from the light source is repeatedly reflected, the intensity distribution of the light is made uniform, and the luminance unevenness of the light emitting portion can be reduced.

According to a fourteenth aspect of the present invention, the transmitted light scattering member is provided on the light emitting portion of the light guide member, and the traveling direction of the transmitted light is changed to various directions, and the surface illumination device is provided. Brightness unevenness can be further reduced.

According to a fifteenth aspect of the present invention, the transmitted light scattering member and the light guide member are provided separately, and the light is guided to every corner of the light guide member by total reflection on the upper surface of the light guide member. And the deviation of the light quantity can be reduced.

According to the invention, a light scattering portion is formed on the lower surface of the light emitting portion of the light guide member, and the light quantity distribution in the light emitting portion can be made more uniform.

According to the seventeenth aspect of the present invention, a reflection plate is provided below the light scattering portion, and the light transmitted through the light scattering portion can be made incident on the light guide member again. Efficiency can be improved.

According to the eighteenth aspect of the present invention, the concave portion for accommodating the reflection plate is formed in the storage member, so that the reflection plate can be positioned by the storage member and the surface illumination device can be made thin. it can.

According to a nineteenth aspect of the present invention, the reflection plate and the light guide member are provided separately, and the plate is stored in the first recess formed in the storage member, and is formed in the storage member. Since the reflection plate is housed in the second concave portion, the step of aligning the light guide member and the reflection plate can be omitted, and the productivity of the surface illumination device can be improved.

According to a twentieth aspect of the present invention, the reflecting surface of the light guide is a concave curved surface, and the incident light is diffused in the in-plane direction of the light guide, and the inner surface of the light guide is formed. Reflection on etc.
Since the light is diffused, the luminance in the light emitting portion can be made uniform.

According to a twenty-first aspect of the present invention, the luminous intensity distribution of the light source includes a first surface passing through the central axis of the luminous intensity of the light source and parallel to the partition and a second surface passing through the central axis of the luminous intensity and perpendicular to the partition. It is different, the number of reflections with the partition and the reflection member until the light emitted from the light source reaches the incident surface is reduced,
Light can be efficiently guided to the light guide member.

According to a twenty-second aspect of the present invention, a display means,
Converting means for converting at least one of a data signal and a voice signal into a transmission signal or converting a reception signal into at least one of a data signal and a voice signal; an antenna for transmitting and receiving the transmission signal and the reception signal; and controlling each unit. A portable terminal device provided with a control unit, wherein the surface illumination device according to any one of claims 1 to 21 is used below the display unit, so that uneven brightness can be reduced in a display unit of the portable terminal device. Thus, it is possible to realize a portable terminal device which is easy for the user to see and therefore has few misidentifications. Further, since only one light source is used, a portable terminal device with extremely low power consumption can be realized, and the battery duration of the portable terminal device can be extended.

[0034] The invention according to claim 23 has a light source,
A light guide that has an incident surface on which light emitted from the light source is incident and a reflective surface that reflects light coming from the incident surface, introduces the light from the light source and spreads it in a plane, and propagates through the light guide A light-guiding member comprising a light-emitting portion that emits the emitted light in a plane, and a partition that suppresses light from the light source from directly entering the light-emitting portion near the light source through the light-guiding portion. The light emitted from the light source can be prevented from traveling near the light source in the light emitting unit, so that the vicinity of the light source in the light emitting unit can be prevented from becoming extremely bright.

[0035] The invention according to claim 24 has a light source,
A light guide that has an incident surface on which light emitted from the light source is incident and a reflective surface that reflects light coming from the incident surface, introduces the light from the light source and spreads it in a plane, and propagates through the light guide A light-guiding member comprising a light-emitting unit that emits the emitted light in a planar shape, and a reflecting member that changes the direction of light emitted from the light source and reflects the light toward the incident surface of the light-guiding unit. Since the traveling direction of the main component of the light emitted upward from the light source can be converted to the direction of the incident surface of the light guide member, most of the light emitted from the light source can be guided to the light guide member. In addition, the light utilization efficiency can be improved, and the distribution of light incident on the light emitting portion of the light guide member can be made more uniform, thereby realizing a surface illumination device that has less luminance unevenness and is easy for the user to see. can do.

[0036] The invention according to claim 25 has a light source,
A light guide that has an incident surface on which light emitted from the light source is incident and a reflective surface that reflects light coming from the incident surface, introduces the light from the light source and spreads it in a plane, and propagates through the light guide A light-guiding member comprising a light-emitting portion that emits light in a planar manner, and a partition that suppresses light from the light source from directly entering the light-emitting portion near the light source through the light-guiding portion. A reflecting member that changes the direction of the light emitted from the light source and reflects the light toward the incident surface of the light guide section, and of the light emitted from the light source, The light emitted from the light source by converting the traveling direction of the main component of the light emitted upward from the light source into the direction of the incident surface of the light guide member can be suppressed while preventing the vicinity of the light source from becoming extremely bright. Can be guided to the light guide member, and the light use efficiency can be improved.

[0037] The invention according to claim 26 has a light source,
A light guide that has an incident surface on which light emitted from the light source is incident and a reflective surface that reflects light coming from the incident surface, introduces the light from the light source and spreads it in a plane, and propagates through the light guide A light emitting member that emits the emitted light in a planar manner, and the high-intensity light near the central axis of the light emission intensity of the light source is incident on the light emission portion by performing at least two or more reflections. While the light emitted from the light source is repeatedly reflected, the intensity distribution of the light is made uniform, and the luminance unevenness of the light emitting portion can be reduced.

(Embodiment 1) Embodiment 1 of the present invention will be described with reference to FIGS.

FIG. 1 is a plan view of the surface lighting device according to the first embodiment of the present invention, FIG. 2 is a side view of the surface lighting device according to the first embodiment of the present invention, and FIG. FIG. 4 is a perspective view of a light guide plate of the surface illumination device, FIG. 4 is a perspective view of a storage member of the surface illumination device according to Embodiment 1 of the present invention, and FIG.
Is a cross-sectional view of the vicinity of the partition wall of the surface illumination device according to the first embodiment of the present invention, and shows a cross section D in FIG.

1 to 5, reference numeral 1 denotes a light source. As the light source 1, a point light source such as a miniature bulb, a wheat bulb, a light emitting diode, or the like can be considered.
m ³ about or in less, the thickness is about 2mm or less, in particular with a high efficiency light emitting diodes in one emission area of 2.5 mm ² approximately or less. In particular, when used in small mobile phones and personal digital assistants, very small and thin ones are required.
It is preferably used m ³ or less. Also, in this case, the fact that the light source 1 can be surface-mounted on the substrate
Can be easily attached to the substrate, so that productivity is improved.

Reference numeral 2 denotes a light guide plate made of a transparent material, which has a function of guiding light from the light source 1. The material is highly transparent such as methacrylic resin or polycarbonate resin. Specifically, the transmittance per 1 mm thickness is 95% or more, and when the length is 30 mm or more, the transmittance per 1 mm thickness is 98%. % Of the material is preferable because the reduction in the amount of light can be suppressed to a minimum and the luminance can be further increased. As such a material, an organic material or glass is suitable. In particular, it is preferable to use a resin having a high degree of freedom in shape and high mass productivity by injection molding using a metal mold. In this embodiment, a methacrylic resin having a high light transmittance among the resins is used. When the light guide plate 2 has a refractive index of 1.3 or more, preferably 1.4 or more, total reflection between the light guide plate 2 and a layer of air (refractive index: about 1) is likely to occur. The amount of light leaking from the light guide plate 2 can be suppressed, and the loss due to the radiation of the light incident on the light guide plate 2 to the outside can be minimized, so that the light use efficiency can be improved and the power consumption of the surface lighting device can be suppressed. It is preferred. 2a is the upper surface of the light guide plate 2, and 2b is the side surface of the light guide plate 2.

Reference numeral 3 denotes a light guide portion of the light guide plate 2, which is an incident surface 3a on which light from the light source 1 is incident and a reflecting surface 3 on which light after incident is reflected.
The light guide portion 3 is a region having a function of spreading light in the width direction of the light guide plate 2 via b.

The light from the light source 1 is applied to the light guide plate 2 from the entrance surface 3a.
The light incident surface 3 a is formed non-perpendicularly to the upper surface 2 a of the light guide plate 2. With such a configuration, it is possible to effectively suppress the light from the light source 1 from passing through the plate thickness of the light guide unit 3 and scatter outside the system, and to increase the light from the light source 1 more. It is preferable because it can be guided to the light guide plate 2.

The reflecting surface 3b is a side surface of the light guide plate 2 where most of the light after entering from the incident surface 3a is first reflected, and is provided to be inclined with respect to the side surface portion 2b of the light guide plate 2. . Thereby, even the light guide plate 2 having a wider width can make light incident on every corner. By providing the reflection surface 3b, even if the length of the light guide portion 3 is shortened, it is possible to realize a surface illumination device with small luminance unevenness and good visibility.

Reference numeral 4 denotes a light emitting portion of the light guide plate 2, and light incident on the light guide plate 2 is emitted from the upper surface of the light emitting portion 4. Since the light emitting portion 4 has a surface roughness of 1 μm or less in average roughness and hardly disturbs light emitted with an appropriate luminance distribution at a boundary surface, a surface lighting device which is easy for a user to see is provided. Can be realized.

Reference numeral 5 denotes a light scattering portion provided on the lower surface of the light emitting portion 4 and has a function of reflecting or transmitting light incident on this portion in various directions. In the present embodiment, the light emitting unit 4
Although the light scattering portion 5 is provided on the lower surface of the light emitting portion, the light scattering portion 5 may be provided on the upper surface of the light emitting portion 4 or on both upper and lower surfaces.

Reference numeral 5a denotes light-scattering dots which actually take on the light-scattering action of the light-scattering portion 5, and are formed from milky white to white ink. The light scattering dots 5a are formed so that the luminance distribution on the upper surface of the light emitting unit 4 becomes uniform and the area ratio increases as the distance from the light source 1 increases. The formation of the light scattering dots 5a on the light scattering portion 5 is often performed by printing, and among printing, screen printing or pad printing is preferable because mass productivity can be improved. In particular, the use of pad printing is preferable because even if the light guide plate 2 has a projection, the light scattering dots 5a can be printed evenly.

Further, it is preferable to form the light scattering dots 5a from milky white to white ink, since good scattering can be obtained and light absorption by the light scattering dots 5a can be minimized. As the milky white to white ink, those in which white fine particles such as titanium oxide are dispersed in a medium are particularly preferable. However, it is not always necessary to mix colored particles, and the same effect can be obtained by putting glass beads having a higher refractive index than the ink in the ink or using air bubbles having a lower refractive index than the ink in the ink. In addition, a sufficient effect can be obtained by using only the medium. In addition, by forming a large number of minute projections or depressions directly on the light scattering portion 5 by using a mold or the like, a scattering effect can be provided and the light scattering dots 5a can be used instead.

Reference numeral 6 denotes a reflecting plate, and the reflecting plate 6 is a member having a high reflectance placed on the lower surface of the light scattering portion 5.
Part of the light that has passed through the light guide plate 2 and exited from the light guide plate 2
Works to return to the inside of the. The reflection plate 6 is often made of a PET (polyethylene terephthalate) sheet or the like, and among the PET sheets, it is particularly preferable to use a microfoamed sheet because the reflectance is improved. Further, the reflection plate 6 may be provided as a separate member with respect to the light guide plate 2, or may be formed directly on the light guide plate 2 in advance by a method such as printing or vapor deposition. Alternatively, a contact surface of the light guide plate 2, which will be described later, with the light scattering portion 5 of the storage member 8 may be used in place of the reflection plate 6. When the reflecting plate 6 is formed directly on the light guide plate 2, the manufacturing process of the surface lighting device can be simplified, the productivity of the surface lighting device can be improved, and the manufacturing cost of the surface lighting device can be reduced. This is a preferable configuration because the surface illumination device can be made thinner. Further, in the case where the light scattering dots 5a are directly formed, the reflection plate 6 may be formed only on the light scattering dots 5a and may not be formed in a place where the light scattering dots 5a are not provided. With this configuration, the light passing through the light scattering dots 5a is surely reflected by the reflection plate 6, and in a portion where the light scattering dots 5a are not provided, the light is efficiently reflected by total reflection on the surface of the light guide plate 2. be able to.

In the case where the reflection plate 6 is formed of another member,
By interposing an air layer between the light guide plate 2 and
Since both the total reflection at the light guide plate 2 and the reflection at the reflection plate 6 can be utilized, it is preferable because the light use efficiency can be improved as a whole. Further, the reflection plate 6 and the light guide plate 2 may be joined in advance in a predetermined positional relationship. This is preferable because the process of assembling the surface lighting device can be simplified. The reflecting plate 6 is provided with a second concave portion 8 of a storage member 8 described later.
It may be configured to be joined in advance to c. In this case, at the time of assembling the surface illumination device, it is possible to suppress the occurrence of inconvenience such that the reflection plate 6 cannot be stored in the second concave portion 8c because the position of the light guide plate 2 and the reflection plate 6 that have been joined in advance is shifted. be able to.

Reference numeral 7 denotes a transmitted light scattering member.
Are arranged on the upper surface of the light emitting portion 4 and have a function of converting the traveling direction of the transmitted light into various directions when the light passes through the transmitted light scattering member 7. This transmitted light scattering member 7
Is often made of a PET sheet or the like whose surface is matte-finished, and may be provided as a separate member for the light guide plate 2, or may be directly formed on the light guide plate 2 by printing or a mold in advance. You may. When directly formed, the manufacturing process of the surface lighting device can be simplified, the number of parts can be reduced, the productivity of the surface lighting device can be improved, and the manufacturing cost of the surface lighting device can be reduced. This is a preferable configuration because the surface illumination device can be made thinner.

In the case where the light guide plate 2 is formed by another member,
The light can be guided to every corner of the light guide plate 2 by the total reflection on the upper surface 2a of the light guide plate 2a, and the bias of the light amount can be reduced. Further, when the light guide plate 2 is formed of a separate member, the transmitted light scattering member 7 and the light guide plate 2 may be joined in a predetermined positional relationship in advance. This is preferable because the process of assembling the surface lighting device can be simplified.

Reference numeral 8 denotes a storage member, and the storage member 8 includes the light guide plate 2.
And the reflection plate 6 and the transmitted light scattering member 7 are housed in desired positions. The material of the storage member 8 is stainless steel,
Various metal materials such as iron and aluminum and resin materials are conceivable, but it is particularly preferable to use a resin material which has a good degree of freedom in shape and mass productivity and also contributes to weight reduction. In particular, the type of resin is ABS (acrylonitrile butadiene.
Styrene), polycarbonate, and the like are preferable, and the color thereof is preferably a color having high reflectance such as white in order to efficiently return the light that has exited the light guide plate 2 from outside the light emitting portion 4 to the inside of the light guide plate 2. In particular, it is preferable to use a material having a reflectance of 80% or more with respect to the light emitted from the light source 1 because the light use efficiency can be improved and required luminance can be secured with less power. In the present embodiment, the light from the light guide plate 2 is reflected on the inner surface of the housing member 8, but a reflective surface may be separately formed on the inner surface with a metal material or a dielectric material having a higher reflectivity. .

The storage member 8 has a configuration in which the light guide plate 2, the reflection plate 6, and the transmitted light scattering member 7 are stored at predetermined positions. This will be described.

The storage member 8 has a first recess 8a, a partition 8
b, second concave portion 8c, rib portion 8d, void portion 8e, partition wall 8
g and the space 8i are molded.

The first concave portion 8a is a portion for accommodating the light guide plate 2, and its outer peripheral shape has such a shape that at least a part thereof is fitted to the outer periphery of the light guide plate 2, and the accommodating member of the light guide plate 2 is provided. 8 is performed. The height h of the side surface portion of the first concave portion 8a is higher than the thickness of the light guide plate 2,
The light leaked from the side surface of the light guide plate 2 can be reflected on the side surface of the first concave portion 8a and returned to the light guide plate 2 again.
This is preferable because the use efficiency of light is improved and the luminance of the surface illumination device is improved.

The second recess 8c is a portion for accommodating the reflection plate 6, and the second recess 8c is formed in a shape such that at least a part of the lower surface of the first recess 8a is further dug down. The height of the side surface portion of the second concave portion 8c is higher than the thickness of the reflection plate 6 to be stored.

8b and 8g are partition walls. The partition wall 8b is disposed between the gap 8e and the first concave portion 8a in the thickness direction of the light guide plate 2, and most of the light from the light source 1 is directly transmitted to the light guide plate 2, In particular, it functions to prevent light from entering near the center of the light guide plate 2 adjacent to the light source 1. By providing the partition walls 8b, it is possible to suppress the light from the light source 1 from directly entering the light guide plate 2, so that the brightness of the light emitting portion (C portion) close to the light source 1 is extremely bright as compared with other portions. Can be suppressed. Therefore, it is possible to realize a surface illumination device having a small luminance distribution and easy for a user to see. In addition, the partition 8b is
It is preferable that the partition wall 8b and the storage member 8 be positioned integrally with each other, so that mass productivity can be improved, and the position between the partition 8b and the light from the light source 1 and the position between the partition 8b and the storage member 8 can be improved. Since steps such as alignment and joining can be eliminated, the productivity of the surface illumination device can be improved. In the present embodiment, the partition wall 8b is constituted by a shielding plate, but may not be a plate having a complete shielding effect.
Those having many minute openings or slits can also be used.

Although the partition wall 8b is formed integrally with the storage member 8 in consideration of mass productivity and the like, it is not always necessary to integrate it.

The partition 8g is provided substantially parallel to the in-plane direction of the light guide plate 2 from the top of the partition 8b to the top of the rib 8d adjacent to the light source 1 on the light emitting portion 4 side. It has a function of reflecting light emitted and emitted upward, and finally causing most of the light emitted upward to enter the light guide plate 2. In the present embodiment, the partition wall 8g
Is integrally formed with the storage member 8 together with the partition wall 8b.

By providing the partition wall 8g, the light source 1
The light emitted above the light source 1 can be efficiently guided to the light guide plate 2, and the light emitted above the light source 1 is directly emitted to the outside of the surface illumination device, and the light emitted from a portion that should not emit light originally Can be prevented from leaking.

Further, the width of the partition wall 8g depends on the light guide portion 3 of the light guide plate 2.
If the distance between the incident surfaces 3a is almost the same, the gap 10 between the partition wall 8g and the light guide plate 2 can be almost eliminated, so that the amount of light leaking from here is minimized. can do.

In the present embodiment, the inner surfaces of the partition walls 8b and 8g on the side of the light source 1 are formed as flat surfaces. Therefore, light can be guided to the light guide plate 2 more efficiently.

The rib 8d reinforces the storage member 8 and increases the mechanical strength of the storage member 8. Further, it has a function of reflecting at least a part of the light diffused from the light source 1 on its side surface, and reflects a part of the light that is not directly guided from the light source 1 to the light guide unit 3, and 3 can be indirectly incident. With this configuration, the use efficiency of light emitted from the light source 1 can be improved, so that power consumption is further reduced and
A surface lighting device with sufficient luminance can be realized.

In the gap 8e through which the light from the light source 1 to the reflection surface 3a of the light guide 3 passes, the light is scattered by dust and the like, so that the amount of light guided to the light guide 3 can be suppressed from being reduced. Preferably, the height of the rib portion 8d is substantially the same so that the top surface 8f is along a substrate (not shown) disposed thereunder. With such a configuration, the amount of dust entering the gap 8e can be reduced, so that the amount of light that is scattered by the dust and does not enter the light guide 3 can be reduced. This is preferable because the use efficiency of the compound can be improved.

Reference numeral 8i denotes a space for avoiding interference with a component mounted on a substrate (not shown). By providing this space, the effective mounting area of the substrate can be increased.

As described above, since the light guide plate 2 and the reflection plate 6 are stored in the storage member 8, the thickness of the surface illumination device can be reduced, and the demand from users for the reduction in the thickness of the device can be met. And a surface lighting device capable of performing such operations.

Next, the procedure for assembling the light guide plate 2, the reflection plate 6, and the transmitted light scattering member 7 with respect to the storage member 8 will be described.
The following methods (1) to (4) are conceivable.

(1) A method of assembling the light guide plate 2, the reflection plate 6, and the transmitted light scattering member 7 in the storage member 8 in a state where they are joined in a predetermined positional relationship in advance (2) Printing, vapor deposition, etc. on the surface of the light guide plate 2 The reflection plate 6 and the transmitted light scattering member 7 are formed in advance by the method described in
(3) The reflecting plate 6 housed in the second recess 8c is a separate member, the reflecting plate 6 is housed in the second recess 8c of the housing member 8, and then the transmitted light scattering member A method of incorporating the light guide plate 2 previously bonded or formed into the storage member 8 (4) The light guide plate 2, the reflection plate 6 and the transmitted light scattering member 7 are separate members, and the reflection sheet 6 is the second member of the storage member 8. After the light guide plate 2 is housed in the concave portion 8c, the light guide plate 2 is assembled into the first concave portion 8a of the holder 8, and then the transmitted light scattering member 7 is joined to a predetermined position of the light guide plate 2 In the above method (1) According to this, the assembling process of the light guide plate 2, the reflecting plate 6, and the transmitted light scattering member 7 and the assembling process of the surface illumination device can be performed in parallel in a separate process up to the incorporation into the storage member 8. Speeds up the process of assembling the surface illumination device, improving productivity It can be.

According to the method (2), the number of parts can be reduced efficiently, and the number of assembling steps and the number of lines can be reduced. Therefore, the productivity of the surface lighting device can be further improved. it can.

Further, according to the method (3), since the reflecting plate 6 can be reliably housed in the second recess 8c, a defective product due to a positional shift between the reflecting plate 6 and the second recess 8c. Can be suppressed, and the yield of the surface illumination device can be improved.

Next, the operation of the surface illumination device according to the first embodiment will be described. Of the light emitted from the light source 1,
The light that reaches the partition 8b of the storage member 8 is reflected by the partition 8b without directly entering the light guide portion 3 because the light is blocked by the partition 8b. The light incident on the partition 8g is not directly emitted to the outside of the surface illumination device but is reflected by the partition 8g because the light is blocked by the partition 8g. A part of the light reflected by the partitions 8b and 8g is transmitted from the incident surface 3a to the light guide portion 3 of the light guide plate 2.
To the light emitting portion 4 of the light guide plate 2 after being reflected by the reflecting surface 3b. On the other hand, of the light emitted from the light source 1, most of the light that does not hit the partition walls 8 b and 8 g enters the inside of the light guide plate 2 from the incident surface 3 a of the light guide unit 3. The incident light travels inside the light guide unit 3 and hits the reflection surface 3 b, and thereafter proceeds toward the light emitting unit 4. A part of the light that has reached the light emitting unit 4 is directly emitted from the upper surface of the light emitting unit 4. Another part is irregularly reflected by the light scattering dots 5 a of the light scattering section 5 and is emitted from the light emitting section 4. Still another part is transmitted through the light scattering part 5 while being disturbed in the traveling direction by the light scattering dots 5 a of the light scattering part 5, reflected by the reflector 6, returned to the light guide plate 2 again, and emitted from the light emitting part 4. You.

Thereafter, the light emitted from the light emitting section 4 passes through the transmitted light scattering member 7. At that time, the traveling direction is changed to multiple directions, and the luminance unevenness is further improved. Further, if the transmitted light scattering member 7 is not provided, there is a disadvantage that the pattern of the light scattering dots 5a is clearly recognized by the human eyes. There is also an advantage that the pattern cannot be recognized to a level at which there is no problem.

As described above, by providing the partition wall 8 b and changing the distribution of light from the light source 1, the light emission portion 4
Extremely high luminance of the portion C near the light source 1 can be prevented, and the luminance can be made uniform.

(Embodiment 2) Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 6 is a perspective view of a storage member of the surface illumination device according to Embodiment 2 of the present invention,
FIG. 7 is a cross-sectional view of the vicinity of the partition wall of the surface illumination device according to the second embodiment of the present invention, and shows a cross section E of a portion indicated by a dotted line in FIG. In FIG. 7, 8h is a reflection member,
The reflecting member 8h is an inner surface of the partition wall 8g on the light source 1 side and is formed by a V-shaped wall, and most of the traveling direction of light emitted upward from the light source 1 is directed to the reflecting surface 3b of the light guide plate 2. Has the function of converting to Most of the light emitted from the light source 1 can be guided to the light guide plate 2 by the reflecting member 8h, so that the light use efficiency can be improved.

When the intensity distribution of the light source 1 is symmetric, the apex or top line of the V-shaped wall of the reflecting member 8h is
Since the light source 1 is disposed so as to be on the extension of the light emission center axis, the amount of light reflected by the reflecting member 8h can be made substantially equal between the left and right, so that the luminance distribution in the light emitting section 4 is good. In addition, it is possible to realize a surface illumination device with high visibility. In the case of an asymmetric type, the reflecting member 8h
By making the area of the surface forming the V-shaped wall forming the shape different according to the degree of asymmetry, the amount of light reflected by the reflecting member 8h can be made substantially equal between the left and right. It is possible to realize an easy-to-see surface illumination device having a small luminance distribution. Further, by intentionally varying the area of the surface constituting the reflecting member 8h, the light amount can be reduced.
It is also possible to make them different in the light emitting section 4.

Further, the incident surface 3a should be an inclined surface which is in contact with the end of the reflecting member 8h and becomes divergent, so that, of the light emitted from the light source 1, the light which is directly incident on the incident surface 3a, It is preferable because both of the light incident on the incident surface 3a via the reflecting member 8h can be efficiently incident on the light guide 3.

Further, the angle of the V-shape of the reflecting member 8h is different from that of the light source 1.
And the distance from the reflecting member 8h to the incident surface 3a of the light guide portion 3 and the thickness of the light guide plate 2, etc., because the light use efficiency can be further improved. preferable. The other components are substantially the same as those in the first embodiment.

In this embodiment, the V-shaped reflection member 8h is formed on the partition wall 8g. However, a similar V-shaped reflection surface may be formed on the inner surface of the partition wall 8b on the light source 1 side. Thereby, the amount of light incident on the light guide plate 2 can be further increased. The sectional shape of the reflecting member 8h may be a U-shape.

Next, the operation of the above-described surface lighting device will be described. Of the light emitted from the light source 1 in the direction of the partition 8g,
The light that has reached the reflecting member 8h has its traveling direction changed by the reflecting member 8h, and most of the light is incident on the incident surface 3a of the light guide unit 3. On the other hand, light emitted laterally from the light source 1 is directly incident on the inside of the light guide plate 2 from the incident surface 3 a of the light guide unit 3. The light that has entered the light guide unit 3 in this manner is reflected by the reflection surface 3b, and then emitted from the light emission unit 4. By providing the reflecting member 8h formed of the V-shaped wall as described above, light emitted upward (in the direction of the partition wall 8g) from the light source 1 which was almost indirectly usable in the first embodiment. Can be efficiently guided to the light guide unit 3, so that the light use efficiency can be greatly improved and a low-power-consumption and high-efficiency surface illumination device can be realized.

The reflecting member 8h may be configured as shown in FIG. FIG. 8 is a sectional view showing the vicinity of the partition wall of the surface illumination device according to the second embodiment of the present invention. The reflecting member 8h shown in FIG. 7 has its V-shaped wall formed in a planar shape, but in FIG. 8, the surface of the reflecting member 8h formed by the V-shaped wall is concaved. It has a configuration. Due to this concave surface, the reflecting member 8h can not only reflect the diffused light from the light source 1 hitting this surface but also have a function of reducing the diffusion angle. Therefore, it has a function of changing the traveling direction while condensing the incident light. Thus, V of the reflecting member 8h
The concave shape of the U-shaped wall makes the light source 1 more efficient than the surface illumination device shown in the second embodiment.
Since the light emitted upward can be guided to the light guide section 3, the efficiency of the surface illumination device can be further improved.

The reflecting member 8h may be configured as shown in FIG. FIG. 9 shows a cross-sectional view of the vicinity of the partition wall of the surface illumination device according to the second embodiment of the present invention. 7 and 8
The top or top line portion of the reflecting member 8h indicated by is very sharp, and it is very likely that it will be damaged if it comes into contact with anything, and if it is accidentally touched during assembly work, etc. May be done. On the contrary,
In the reflecting member 8h shown in FIG. 9, the shape of the apex (or top line) of the V-shaped wall is such that a sharp part is cut off or rounded, and the shape is not an edge. Thus, the possibility of damage to the reflecting member 8h can be reduced, and the safety of the assembling work can be improved. In addition, the light source 1 and the reflecting member 8
Even when the relative positional relationship of h is shifted, the variation in the luminance distribution of the light emitting unit 4 can be minimized.

Embodiment 3 Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 10 is a plan view of the surface lighting device according to the third embodiment. FIG.
In the present embodiment, as shown in FIG.
It is a concave curved surface, and the shape of the fitting portion of the storage member 8 is a convex curved surface in accordance with the concave curved surface. Light emitted from the light source 1 directly or indirectly enters the inside of the light guide plate 2 from the incident surface 3a of the light guide unit 3 via the partition wall 8b or the reflection member 8h. The incident light travels inside the light guide 3 and hits the reflection surface 3b. The light that has hit the reflecting surface 3b is diffused in the in-plane direction of the light guide portion 3 because the shape of the reflecting surface 3b is a concave curved surface, and is reflected and diffused on the inner surface of the storage member 8 and the like. It proceeds toward the scattering unit 5. Since the concave curved surface of the reflection surface 3b diffuses light as described above, the luminance of the light emitting unit 4 can be made uniform. At this time, it is preferable that the curvature of the reflection surface 3b is changed according to the intensity distribution of the light emitted from the light source 1 and incident on the reflection surface 3b. That is, where the strength is high,
Reduce the curvature of the concave surface, diffuse the light more,
In a portion where the intensity is low, it is preferable to increase the curvature of the concave portion so that light is not diffused so much that the luminance of the light emitting portion 4 can be made uniform. .

(Embodiment 4) Next, Embodiment 4 of the present invention will be described with reference to FIGS.
FIG. 11 is a plan view of a surface lighting device according to the fourth embodiment,
FIG. 12 is a side view of the surface lighting device according to the fourth embodiment. In the structures of the first to third embodiments, the light source 1 has been described as a top emission type.
As shown in FIG. 1, a side emission type light source 1 is used. Correspondingly, the partition 8b and the reflecting member 8h are arranged at the positions shown in FIG. According to the present embodiment, F in FIG.
Since the overall height of the surface illumination device, which is the size, can be kept low, the device can be made thinner.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIG. 13, FIG. 14, and FIG. FIG. 13 is a perspective view of a light source of the surface illumination device according to the fifth embodiment, FIG. 14 is a light emission intensity distribution diagram of the light source, and FIG.
5 is a side view of the same-surface lighting device. The type of the light source 1 of the present embodiment is a point light source such as a light emitting diode. In FIG. 13, 1a is a light emitting diode chip that is actually emitting light, and 1b is formed so as to surround the light emitting diode chip 1a. The lens 1c is a base substrate on which the light emitting diode chip 1a is mounted. The material of the lens 1b is preferably an epoxy resin which has high optical transparency and can withstand the high temperature of the later soldering process, and has a semi-cylindrical shape as shown in FIG. With such a shape of the lens 1b, the light source 1 has an emission intensity distribution as shown in FIG. That is, when viewed from the G direction in FIG.
Due to the effect of the curved surface b, a steep light emission distribution having a peak immediately above the light emitting diode chip 1a is obtained. Further, the light emission distribution becomes gentle when viewed from the H direction in FIG. When this light source 1 is arranged in a surface illumination device as shown in FIG. 15, components of the light emitted from the light source 1 that fall on the partition walls 8b and the rib portions 8d of the storage member 8 are reduced, so that the light energy due to the reflection of these walls is reduced. Since the absorption loss of light is reduced, the light use efficiency can be further improved.

In the first to fifth embodiments, the light source 1 is described as having a single light-emitting diode chip 1a mounted in the light source 1. However, the light-emitting diode chips having different light emission wavelengths are included in the light source 1. If the light source 1 includes a plurality of light sources 1a, it is possible to realize a surface lighting device capable of switching emission colors.

In all of the above embodiments, one light source 1 has been described. However, if the area to be illuminated becomes large, it is of course possible to use a plurality of light sources 1.

(Embodiment 6) Next, as an example in which the surface lighting device shown in Embodiments 1 to 5 is used for an electronic device, a portable terminal device which is particularly frequently used will be described.

FIGS. 16 and 17 are a perspective view and a block diagram, respectively, showing a portable terminal device according to Embodiment 6 of the present invention. 16 and 17, reference numeral 29 denotes a microphone for converting a sound to a sound signal, 30 denotes a speaker for converting a sound signal to a sound, 31 denotes an operation unit including dial buttons and the like, 32 denotes a display unit, and 32 denotes a display unit. Displays characters such as a telephone number and the name of the other party based on incoming information, outgoing information, search information, and the like, and is often constituted by a liquid crystal or the like. A surface lighting device is mounted. 33 is an antenna, 34
Is a transmission unit for demodulating an audio signal from the microphone 29 and converting it to a transmission signal. The transmission signal produced by the transmission unit 34 is emitted to the outside through an antenna. A receiving unit 35 converts a received signal received by the antenna into an audio signal. The audio signal created by the receiving unit 35 is converted into audio by the speaker 30. 36 is a transmitting unit 34, a receiving unit 35, an operation unit 3
1, a control unit for controlling the display unit 32;

Hereinafter, an example of the operation will be described.

First, when there is an incoming call, the receiving unit 35
Sends an incoming signal to the control unit 36, the control unit 36 displays a predetermined character or the like on the display unit 32 based on the incoming signal, and further presses a button or the like for receiving an incoming call from the operation unit 31. And a signal is sent to the control unit 36,
The control unit 36 sets each unit to the incoming call mode. That is, the signal received by the antenna 33 is converted into an audio signal by the receiving unit 35, the audio signal is output as audio from the speaker 30, and the audio input from the microphone 29 is converted into an audio signal, Through the antenna 33 to the outside.

Next, a case of transmitting a call will be described.

First, when a call is transmitted, a signal to the effect that the call is transmitted from the operation unit 31 is input to the control unit 36. Subsequently, when a signal corresponding to the telephone number is transmitted from the operation unit 31 to the control unit 36, the control unit 36 transmits a signal corresponding to the telephone number from the antenna 33 via the transmission unit 34. At this time, the input signal is often displayed on the display unit 32. When communication with the other party is established by the transmission signal, a signal to that effect is sent to the control unit 36 through the reception unit 35 via the antenna 33, and the control unit 36 sets each unit to the transmission mode. That is, the signal received by the antenna 33 is converted into an audio signal by the receiving unit 35, the audio signal is output as audio from the speaker 30, and the audio input from the microphone 29 is converted into an audio signal.
The data is transmitted to the outside via the antenna 33 via the transmission unit 34.

In the present embodiment, an example in which voice is transmitted and received has been described. However, the present invention is not limited to voice, and the same applies to electronic devices that transmit and / or receive data other than voice such as character data. The effect can be obtained.

Next, the configuration near the display section 32 will be described in detail with reference to FIG. FIG. 18 is a partial cross-sectional view of the portable terminal device according to the sixth embodiment of the present invention.
3A shows a cross section. In the figure, 11 is a housing which is an exterior material of the mobile terminal device, 12 is a liquid crystal display element for displaying some information of the mobile terminal device, and 13 is Embodiment 1 to Embodiment 1.
Any one of the surface lighting devices described in the third embodiment, 14
Denotes a substrate on which the surface illumination device 13 is mounted and on which electronic circuits and the like are mounted. The use of the surface illumination device 13 makes it possible to reduce uneven brightness in the display unit 32 of the mobile terminal device, so that a mobile terminal device that is easy for the user to see and that has little false recognition can be realized. Also one
Since only three point light sources are used, a portable terminal device with extremely low power consumption can be realized.

[0096]

As is apparent from the above, the surface illuminating device of the present invention comprises an incident surface on which light emitted from a light source is incident, a reflecting surface for reflecting light incident from the incident surface, and the reflecting surface. A light guide member having a light emitting portion that emits light that has been reflected and propagated inside, and a partition wall that suppresses light emitted from the light source to be directly incident on the light emitting portion near the light source. As a result, of the light emitted from the light source,
Since the light that goes directly to the light emitting portion near the light source can be suppressed, it is possible to prevent the light emitting portion near the light emitting portion from being extremely bright, and to realize a surface illumination device with small luminance unevenness and good visibility. Can be.

Also, by providing a reflecting member for reflecting the light emitted from the light source in the direction of the incident surface, most of the light emitted upward from the light source travels in the direction of the incident surface of the light guide member. The light can be converted and most of the light emitted from the light source can be guided into the light guide member, so that the light use efficiency can be improved and the light incident on the light emitting portion of the light guide member can be improved. Can be made more uniform, so that it is possible to realize a surface illumination device with small luminance unevenness and good visibility.

Further, display means, conversion means for converting at least one of a data signal and an audio signal into a transmission signal or converting a reception signal into at least one of a data signal and an audio signal, and converting the transmission signal and the reception signal A mobile terminal device including an antenna for transmitting and receiving and a control unit for controlling each unit, wherein the surface illumination device described above is used below the display unit, so that the display unit of the mobile terminal device has brightness unevenness. Therefore, it is possible to realize a portable terminal device which is easy for the user to see and therefore has few misidentifications. Further, since only one light source is used, a portable terminal device with extremely low power consumption can be realized, and the battery duration of the portable terminal device can be extended.

[Brief description of the drawings]

FIG. 1 is a plan view of a surface lighting device according to a first embodiment of the present invention.

FIG. 2 is a side view of the surface lighting device according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a light guide plate of the surface illumination device according to the first embodiment of the present invention.

FIG. 4 is a perspective view of a storage member of the surface lighting device according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of the vicinity of a partition wall of the surface illumination device according to the first embodiment of the present invention.

FIG. 6 is a perspective view of a storage member of the surface illumination device according to the second embodiment of the present invention.

FIG. 7 is a cross-sectional view of the vicinity of a partition wall of the surface illumination device according to the second embodiment of the present invention.

FIG. 8 is a cross-sectional view of the vicinity of a partition wall of the surface illumination device according to the second embodiment of the present invention.

FIG. 9 is a cross-sectional view around a partition wall of the surface illumination device according to the second embodiment of the present invention.

FIG. 10 is a plan view of a surface lighting device according to a third embodiment of the present invention.

FIG. 11 is a plan view of a surface lighting device according to a fourth embodiment of the present invention.

FIG. 12 is a side view of a surface lighting device according to a fourth embodiment of the present invention.

FIG. 13 is a perspective view of a point light source of a surface illumination device according to a fifth embodiment of the present invention.

FIG. 14 is an emission intensity distribution diagram of a point light source of the surface illumination device according to the fifth embodiment of the present invention.

FIG. 15 is a side view of a surface lighting device according to a fifth embodiment of the present invention.

FIG. 16 is a perspective view showing a portable terminal device according to Embodiment 6 of the present invention.

FIG. 17 is a block diagram showing a portable terminal device according to Embodiment 6 of the present invention.

FIG. 18 is a partial cross-sectional view of a portable terminal device according to Embodiment 6 of the present invention.

FIG. 19 is a plan view of a conventional surface lighting device.

FIG. 20 is a side view of a conventional surface lighting device.

[Explanation of symbols]

 Reference Signs List 1 light source 1a light emitting diode chip 1b lens 1c base substrate 2 light guide plate 2a upper surface 2b side surface 3 light guide unit 3a incident surface 3b reflection surface 4 light emission unit 5 light scattering unit 5a light scattering dot 6 reflection plate 7 transmitted light scattering member 8 housing Member 8a First concave portion 8b Partition wall 8c Second concave portion 8d Rib portion 8e Void portion 8f Top surface 8g Partition wall 8h Reflection member 8i Space 10 Gap 11 Housing 12 Liquid crystal display element 13 Surface illumination device 14 Substrate 30 Speaker 31 Operation unit 32 Display unit 33 Antenna 34 Transmitting unit 35 Receiving unit 36 Control unit

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takahiro Omori 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 2H091 FA14Z FA23Z FA31Z FA41Z FA45Z FD01 FD03 GA11 LA11 LA16 LA18 5G435 AA03 AA18 BB12 DD13 EE27 FF03 FF08 GG23 LL07

Claims (29)

[Claims] A light source; an incident surface on which light emitted from the light source is incident; a reflecting surface for reflecting light incident from the incident surface; and light reflected by the reflecting surface and propagating through the interior. A surface lighting device, comprising: a light guide member including a light emitting portion; and a partition wall for suppressing light emitted from the light source from directly entering the light emitting portion. 2. The surface illumination device according to claim 1, wherein the light emitted from the light source is reflected by the reflection surface of the light guide member and enters the light emitting portion. 3. The surface lighting device according to claim 1, wherein the surface of the partition wall on the light source side has a reflecting action. 4. The surface illumination device according to claim 3, wherein a part of the light reflected by the partition is reflected by the reflection surface of the light guide and enters the light emitting portion. 5. The surface lighting device according to claim 1, further comprising a storage member for storing the light guide member, wherein a partition is integrally formed with the storage member. 6. A light source, an incident surface on which light emitted from the light source is incident, a reflecting surface for reflecting light incident from the incident surface, and a light reflected by the reflecting surface and propagating inside. A surface lighting device, comprising: a light guide member including a light emitting portion; and a reflecting member configured to reflect light emitted from the light source toward the reflecting surface. 7. The surface lighting device according to claim 6, further comprising a storage member for storing the light guide member, wherein a reflection member is integrally formed with the storage member. 8. A reflection member is provided on a light source, and the reflection member has a substantially V-shaped cross section.
A surface lighting device according to claim 1. 9. The surface illumination device according to claim 6, wherein a cross-sectional shape of the reflection member is a concave curved surface. 10. The surface lighting device according to claim 8, wherein the shape of the vertex of the reflecting member facing the light source is a curved surface or a flat surface. 11. A light source, an incident surface on which light emitted from the light source enters, a reflecting surface for reflecting light incident from the incident surface, and a light reflected by the reflecting surface and propagating inside. A light guide member including a light emitting unit, a partition wall for suppressing light emitted from the light source from directly entering the light emitting unit, and reflecting the light emitted from the light source toward the reflection surface. A surface lighting device comprising a reflecting member. 12. The surface lighting device according to claim 11, further comprising a storage member for storing the light guide member, wherein a partition wall and a reflection member are integrally formed with the storage member. 13. A light source, an incident surface on which light emitted from the light source is incident, a reflecting surface for reflecting light incident from the incident surface, and a light reflected by the reflecting surface and propagating inside. And a light guide member having a light emitting portion, wherein at least two high-intensity lights near the central axis of the light emission intensity of the light source are provided.
A surface illumination device characterized by being incident on a light emitting portion by performing reflection more than once. 14. A light-scattering member is provided on a light-emitting portion of the light-guiding member.
A surface lighting device according to any one of the preceding claims. 15. The surface lighting device according to claim 14, wherein the transmitted light scattering member and the light guide member are provided separately. 16. The surface lighting device according to claim 1, wherein a light scattering portion is formed on a lower surface of the light emitting portion of the light guide member. 17. The surface illumination device according to claim 1, wherein a reflection plate is provided below the light scattering portion. 18. The surface lighting device according to claim 17, wherein a concave portion for storing the reflection plate is formed in the storage member. 19. A reflection plate and a light guide member are provided separately,
The light guide member is housed in a first recess formed in the housing member, and the reflector is housed in a second recess formed in the housing member.
8. The surface lighting device according to 7. 20. The surface illumination device according to claim 1, wherein the reflection surface of the light guide is a concave curved surface. 21. The luminous intensity distribution of the light source is different between a first surface passing through the central axis of the luminous intensity of the light source and parallel to the partition and a second surface passing through the central axis of the luminous intensity and perpendicular to the partition. The surface lighting device according to claim 1, wherein: 22. Display means, conversion means for converting at least one of a data signal and an audio signal into a transmission signal or converting a reception signal into at least one of a data signal and an audio signal, and converting said transmission signal and said reception signal. 22. A portable terminal device comprising an antenna for transmitting and receiving and control means for controlling each part, wherein the portable terminal device is provided near the display means.
A portable terminal device comprising the surface lighting device according to any one of the preceding claims. 23. A surface having a light source, having an incident surface on which light emitted from the light source is incident, and a reflecting surface for reflecting light incident from the incident surface, and introducing incident light from the light source. A light-guiding member including a light-guiding unit that spreads out in a shape and a light-emitting unit that emits light that has propagated through the light-guiding unit in a planar shape, and light from the light source passes through the light-guiding unit through the light. A surface illumination device, comprising a partition wall for suppressing direct incidence on the emission section near the light source. 24. A surface having a light source, having an incident surface on which light emitted from the light source is incident, and a reflecting surface for reflecting light incident from the incident surface, and introducing incident light from the light source. A light-guiding member comprising a light-guiding unit that spreads out in a shape and a light-emitting unit that emits light propagating through the light-guiding unit in a planar shape, and the light-guiding unit changes the direction of light emitted from the light source. A reflecting member for reflecting light in a direction of the incident surface of the portion; 25. A surface having a light source, a light incident surface on which light emitted from the light source is incident, and a reflecting surface for reflecting light incident from the light incident surface, the light incident on the light source being introduced. A light-guiding member including a light-guiding unit that spreads out in a shape and a light-emitting unit that emits light that has propagated through the light-guiding unit in a planar shape, and light from the light source passes through the light-guiding unit through the light. A partition wall that suppresses direct incidence near the light source of the emission unit,
A surface lighting device, comprising: a reflecting member that changes a direction of light emitted from the light source and reflects the light toward the incident surface of the light guide. 26. A surface having a light source and having a light incident surface on which light emitted from the light source is incident and a reflecting surface for reflecting light incident from the light incident surface, for introducing incident light from the light source. A light guide member composed of a light guide portion that spreads out in a shape, and a light emission portion that emits light that has propagated through the light guide portion in a planar shape, and at least high-intensity light near the emission intensity center axis of the light source is provided. A surface illumination device, wherein the light is incident on a light emitting portion by performing reflection twice or more. 27. The surface lighting device according to claim 1, wherein a point light source is used as the light source. 28. The surface lighting device according to claim 27, wherein a light emitting area of the point light source is 2.5 mm ² or less. 29. The surface lighting device according to claim 27, wherein a light emitting diode is used as the point light source.