JPH1097806A - Lighting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize emission of a light source and easily replace it. SOLUTION: On a side surface of a liquid crystal display element 13, constituent parts such as lens sheet 5, a diffusion sheet 2, a light conductor plate 1, an irregular reflector 4 and a reflection sheet 3 are placed in position in this order, and a light sources 6, 7 are placed on both sides 1c of the light conductor plate 1 and supported by a light source holder 11. All constituent parts are integrated in a pair f main chasis 8 and sub chasis 9. Since a protruding portion 11a having characteristics of light reflection and insulation is positioned between the light sources 6 and 7, each light source 6 or 7 is insulated so that stable emitting can be always secured. Since the light sources unit 10 containing the light sources 6, 7 and the light source holder 11 can be removed by sliding from a lighting equipment body, replacement of the light source 6, 7 is easily achieved by puling out the light source unit 10 from the light equipment body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device used for a light-receiving display device such as a liquid crystal display device.

[0002]

2. Description of the Related Art A conventional illumination device for a light-receiving display device such as a liquid crystal display device includes an edge light type illumination device.
In recent years, it is expected that a liquid crystal display device will be replaced by a cathode ray tube (CRT), and there is a demand for higher brightness of the liquid crystal display device. In order to achieve higher brightness of liquid crystal display devices,
There is an edge-light type illumination device having two light sources at each end with an increased number of light sources.

FIG. 14 is a plan view of a two-edge edge light type illuminating device 34 at both ends according to the prior art. FIG. 15 is a cross-sectional view when the two-end edge light type illumination device 34 at each end is cut along the cutting plane line BB shown in FIG. FIG.
6 is an enlarged sectional view showing a region 36 shown in FIG. 15 of the two-light edge light type illuminating device 34 at both ends.

A two-edge edge light type illuminating device 34 at each end.
Are a light guide plate 21, a diffusion sheet 22, and a reflection sheet 23.
, Diffuse reflection member 24, lens sheet 25, light source 2
6, 27, a main chassis 28, and a sub-chassis 29
It is comprised including. The light guide plate 21 is disposed on one surface side of the liquid crystal display element 33, and the liquid crystal display element 3 of the light guide plate 21 is disposed.
The diffusion sheet 22 is disposed in close contact with the light-dissipating surface 21a that is the third surface, and the reflection sheet 23 is disposed in close contact with the light-shielding surface 21b of the light guide plate 21 opposite to the light-dissipating surface 21a. One or two lens sheets 25 are arranged between the liquid crystal display element 33 and two light sources 26 and 27 are arranged on both sides 21 c of the light guide plate 21 facing each other. The light sources 26 and 27 are linear, parallel to both side surfaces 21c of the light guide plate 21, and
7 are arranged in the thickness direction of the light guide plate 21.

[0005] An irregular reflection member 24 is formed on the light-shielding surface 21b of the light guide plate. The irregular reflection member 24 is formed by, for example, directly forming irregularities on the light-shielding surface 21b or printing an ink containing glass beads. The components arranged as described above are covered and integrated by a main chassis 28 and a sub-chassis 29 which are a pair of housings. A region of the main chassis 28 facing the display surface of the liquid crystal display element 33 has a light transmitting property.

The light emitted from the light sources 26 and 27 is reflected by the reflection sheet 23 toward the light guide plate 21 and is emitted from the light diffusion surface 21a of the light guide plate 21. At this time, the irregular reflection member 24 on the light shielding surface 21b of the light guide plate 21 is
Since light is formed in a scattered point shape having an optimum gradation with respect to 27, light emitted from the light diffusion surface 21a becomes uniform surface light emission. The light transmitted through the light guide plate 21 is directed in the front direction by the diffusion sheet 22, and
5, the front luminance is increased, and the light enters the liquid crystal display element 33.

FIG. 17 is a perspective view showing a method of attaching and detaching the light sources 26 and 27. The two-edge-edge-light-type illuminating device 34 at both ends is connected to the main chassis 2
8. Although not shown, the lens sheet 25, the diffusion sheet 22, the light guide plate 21, and the reflection sheet 23 are arranged in order, and further, the sub-chassis 29 is arranged. The constituent members arranged as described above correspond to both side surfaces 2 of the light guide plate 21.
1c, together with the light sources 26 and 27 respectively arranged between the main chassis 28 and the sub-chassis 29,
From the side of the sub-chassis 29 opposite to the liquid crystal display element 33,
It is fixed by screws 32.

The light sources 26 and 27 have a lifetime. Generally, the light source is turned on for about 10,000 hours or more,
Since the luminance with respect to the initial state is halved, it is necessary to replace the light source whose luminance has decreased for long-term use of the lighting device 34. The replacement of the light sources 26 and 27 is performed by removing the sub-chassis 29 fixed with the screw 32 and disassembling the lighting device 34.

[0009]

The conventional two-light edge-light type illuminating device 34 at each end includes a light-shielding surface 21b of the light guide plate 21.
The light transmitted through the light guide plate 21 is uniformly emitted from the light diffusion surface 21a by the irregular reflection member 24 formed thereon. The diffuse reflection member 24 is formed by adjusting the light emitted from the light sources 26 and 27 so as to have uniform surface light emission. Stable light emission is required. However, the conventional two-edge-edge-light illuminator 34 at each end is used.
The gap between the light source 26 and the light source 27 arranged side by side on both side surfaces 21c of the light guide plate 21 is very narrow, about 1 to 3 mm. Therefore, the electric field and the magnetic field generated from the respective light sources 26 and 27 interfere with each other, so that a current leaks and the stable light emission of the light sources 26 and 27 is prevented. As a result, a luminance difference occurs between the light source 26 and the light source 27, or a predetermined tube current does not flow through each of the light sources 26 and 27, so that the light emission amount is reduced. Therefore, the luminance value per power consumption is reduced. A problem occurs, and the surface light emission from the light diffusion surface 21a of the light guide plate 21 becomes non-uniform.

In order to replace the light sources 26 and 27 whose luminance has been reduced, it is necessary to disassemble the main chassis 28 and the sub-chassis 29 which are fixed with screws 32.
The operation is relatively complicated and takes a lot of time. further,
The extremely thin light sources 26 and 27 are attached and detached by the operator by touching them directly with their hands, so that careful handling is required to prevent damage.

An object of the present invention is to provide a lighting device capable of stably obtaining light and a lighting device capable of easily replacing a light source.

[0012]

SUMMARY OF THE INVENTION The present invention comprises at least a light source, light guiding means for guiding light from the light source to display means, and reflecting means for reflecting light from the light source toward the light guiding means. The light source, covering the light guide means and the reflection means, are arranged on the display means side and the opposite side, respectively,
A pair of housings that are fixed to each other, wherein a region facing the display surface of the display unit of the housing is arranged on the display unit side of the pair of housings. A light-reflecting insulating member that is provided on at least one side surface of the light guide unit and is provided between the plurality of light sources provided on the side surface side of the light guide unit. It is a lighting device characterized by the above.

According to the present invention, each light source is insulated by arranging the light-reflecting insulating member between the plurality of light sources as described above, and interference of electric and magnetic fields generated from other light sources is prevented. As a result, current leakage does not occur, and stable light emission can always be obtained.

The present invention also provides a light source, light guiding means for guiding light from the light source to a display means, reflecting means for reflecting light from the light source toward the light guiding means, at least the light source, A pair of housings that are arranged on the display unit side and the opposite side to cover the light unit and the reflection unit, respectively, and are fixed to each other; one of the housing units arranged on the display unit side of the pair of housing units In a lighting device having a light-transmitting property, a region facing the display surface of the display means holds the light source, and a surface facing the light source includes a holding means having a light reflecting property. A lighting device, characterized in that cutouts are formed as insertion holes through which the holding means can be detachably inserted when fixed to each other.

According to the present invention, the holding means can be slidably attached to and detached from the illuminating device main body by an insertion hole formed when the pair of housings are fixed to each other. Therefore, the replacement of the light source whose luminance has been reduced can be easily performed in a short time by extracting the holding means from the lighting device body. In addition, since the light source is covered with the holding means, it is easy to handle, preventing damage to the light source, and improving work efficiency.

Also, the present invention provides a light source, a light guiding means for guiding light from the light source to a display means, a reflecting means for reflecting light from the light source toward the light guiding means, at least the light source, A pair of housings that are arranged on the display unit side and the opposite side to cover the light unit and the reflection unit, respectively, and are fixed to each other; one of the housing units arranged on the display unit side of the pair of housing units In a lighting device having a light-transmitting region facing the display surface of the display means, a plurality of the light sources are provided adjacent to each other on at least one side surface of the light guide means, and a plurality of the light sources are collectively provided. Holding means having a light-reflecting and insulating protruding portion disposed between the plurality of light sources, the holding means having a light-reflecting surface facing the light source; Are fixed to each other. The holding means when a lighting apparatus, wherein a detachably be inserted to the insertion hole cutout is formed respectively.

According to the present invention, the plurality of light sources are held by the holding means. In the holding means, a projection having light reflectivity and insulation is arranged between the light sources, so that light from the light sources is reflected toward the light guide means, and the light sources are insulated from each other and generated from other light sources. Since there is no interference of the electric field or magnetic field, no current leakage occurs and stable light emission can be obtained. Further, when the pair of housings are fixed to each other, an insertion opening through which the holding means is removably inserted is formed, so that the holding means can be slidably attached to and detached from the lighting device body. Therefore, the light emission of the light source can be stabilized, and the light source whose luminance has decreased can be easily replaced in a short time. Further, since the light source is covered with the holding means, it is easy to handle, preventing damage to the light source, and improving work efficiency.

The present invention also provides a plurality of light sources, holding means having a plurality of light sources close to each other and collectively holding the light sources, and having a light-reflecting curved surface opposed to each light source, and a display means. A light source held by the holding means is arranged on at least one side, and a light guide means for guiding light from the light source to a display means, and a display means of the light guide means are opposite to each other. A reflection unit disposed on the side and reflecting the light from the light source toward the light guide unit; and covering the light source, the light guide unit and the reflection unit held by the holding unit, and opposing the display unit side. A pair of housings respectively arranged on the side and fixed to each other, and at least a region of the housing which is arranged on the display means side of the pair of housings and faces at least a display surface of the display means has a light transmitting property. And a pair of housings Mukoto an illumination apparatus according to claim.

According to the present invention, a plurality of light sources are collectively held by a holding means having a curved surface having light reflectivity, facing each light source. Light emitted from each light source is reflected by each of the curved surfaces, and most of the light enters the light guide means without affecting other light sources. Therefore, interference of the electromagnetic field between one of the plurality of light sources and the other light source is reduced, and the conventional illumination that reflects light from the plurality of light sources on a single reflecting surface and guides the light to the light guide means. Light emission more stable than the device can be obtained. Such a holding means is effectively used when a space for providing the protrusion between the light sources cannot be secured.

Further, the present invention is characterized in that the pair of housings are formed with cutouts each serving as an insertion opening through which the holding means is detachably inserted when fixed to each other.

According to the present invention, the holding means having the curved surface can be slidably moved in the insertion opening formed when the pair of housings are fixed to each other, and the holding means can be moved relative to the lighting device main body. The holding means can be detached. Accordingly, when the brightness of the light source that emits light with relatively stable light is reduced, the holding unit is extracted from the lighting device main body, and the light source can be replaced only by the holding unit. Furthermore, when the light source is mounted on the holding means, the light source is covered with the holding means, so that it is not necessary to directly touch the light source with the hand, and the light source can be safely and quickly mounted on the lighting device.

Further, the present invention is characterized in that the holding means is provided with a support member for assisting the holding of the light source.

According to the present invention, since the holding means is provided with a support member for assisting the holding of the light sources, each light source is more reliably held in the holding means.
Therefore, even in an unstable state where vibration is applied to the light source, such as when attaching and detaching the holding means from the lighting device body for replacement of the light source, the risk of the light source coming off the holding means and being damaged is reduced, and a safe light source is provided. The replacement and the light emitting operation of the light source can be continued.

Further, the present invention is characterized in that a support member for assisting the holding of the light source is further provided from the projecting portion of the holding means.

According to the present invention, in the holding means,
A support member is further provided from the protrusion. For example, by providing the support member so as to further wrap the outside of the light source from the projection, a plurality of light sources can be reliably supported collectively, and the light source is not damaged even if it receives some vibration. .

Further, the present invention is characterized in that a support member for assisting the holding of the light source is further protruded from the convex portion of each curved surface of the holding means.

According to the present invention, in the holding means having a curved surface, a support member is further provided to project from a convex portion between the curved surfaces. For example, by expanding the area in contact with the light source from the convex portion and providing the support member so as to enclose the light source, the plurality of light sources can be reliably held in the holding means, and the light source can be securely held even if it receives some vibration. Will not be damaged.

Further, the present invention is characterized in that it includes a wiring board on which wiring from a held light source is formed, which is arranged on the back of the holding means.

According to the present invention, a wiring board is provided on the back of the holding means. When the wiring cable is pulled out from the insertion side end of the holding means through the insertion opening of the lighting device body, the wiring cable passes between the holding means and the inner wall of the insertion opening, and the holding means is easily caught when attaching and detaching. ,
Also, the wiring cable may be rubbed and disconnected, but in the present invention, the wiring board guides the electrode of the light source to the end of the holding means located on the entrance side of the insertion port. There is no need to pass through. By providing the wiring board in, for example, a thin flat plate shape and integrally provided with the holding means, the holding means is not caught by the insertion opening, and the holding means can be smoothly attached and detached. Further, disconnection of the wiring cable can be prevented.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view of a two-edge edge light type illumination device 14 at both ends according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the two-end edge light type illumination device 14 at each end when cut along a cutting plane line AA shown in FIG. FIG. 3 is an enlarged sectional view showing the region 16 shown in FIG. 2 of the two-light edge light type illumination device 14 at each end. FIG. 4 is a perspective view showing a light source unit 10 which is a constituent member of the two-light edge light type illumination device 14 at each end.

The above-mentioned two-light edge-light type illuminating device 1 at each end
4 is a light guide plate 1, a diffusion sheet 2, a reflection sheet 3,
Diffuse reflection member 4, lens sheet 5, light sources 6, 7, main chassis 8, sub-chassis 9, light source unit 1
0. The light source unit 10 is obtained by integrating the light sources 6 and 7 and a light source holder 11 that is a holding unit of the light source.

The light guide plate 1 is arranged on one surface side of the liquid crystal display element 13, the diffusion sheet 2 is arranged on a light diffusion surface 1 a of the light guide plate 1 on the liquid crystal display element 13 side, and the light diffusion The reflection sheet 3 is disposed in close contact with the light shielding surface 1b opposite to the surface 1a, and one or two lens sheets 5 are disposed in close contact between the diffusion sheet 2 and the liquid crystal display element 13. The light source units 10 are respectively arranged on both side surfaces 1c facing each other. The light sources 6 and 7 included in the light source unit 10 are linear, and are arranged in parallel along both side surfaces 1 c of the light guide plate 1, and the light sources 6 and 7 are arranged in the thickness direction of the light guide plate 1. , 7 are held by a light source holder 11. The light source unit 10 can be attached to and detached from the lighting device main body 15 by a sliding method in a certain direction.

As the light guide plate 1, for example, a V-shaped light guide plate is used. The V-shaped light guide plate becomes thinner from both sides 1c of the light guide plate to the center and has a V-shaped shape, so that the brightness becomes higher than that of a flat light guide plate. Therefore, although it is preferable to use a V-shaped light guide plate, a flat light guide plate similar to the prior art may be used. On the light guide plate light-shielding surface 1b, an irregular reflection member 4 formed by printing ink containing glass beads, for example, is formed. The irregular reflection member 4 is adjusted in accordance with the light emission state of the light sources 6 and 7, and is arranged in an optimal gradation pattern. Each of the constituent members arranged as described above is a main chassis 8 which is a pair of housings.
And the sub-chassis 9 and are integrated. The area facing the display surface of the display panel of the sub-chassis 8 is:
It has translucency.

The light radiated from the light sources 6 and 7 is reflected toward the light guide plate 1 by the reflection sheet 3 and is guided as uniform surface light by the irregular reflection member 4 formed on the light shielding surface 1b of the light guide plate 1. Light is emitted from the light diffusion surface 1a of the light plate 1. The light transmitted through the light guide plate 1 is directed in the front direction by the diffusion sheet 2, and the brightness thereof is increased by the lens sheet 5, and then enters the liquid crystal display element 13.

The light source holder 11 for holding the light sources 6 and 7
It is manufactured by injection molding polycarbonate, which is a high-reflectance insulator. The light source holder 11 includes a light source 6 and a light source 7.
And a plate-shaped protrusion 11a having light reflectivity and insulating property, which is disposed between them. The protrusion 11a has a thickness of, for example, 1 mm and a length of at least the diameter of the light sources 6, 7. Since the light sources 6 and 7 are insulated by the protrusion 11a, it is possible to prevent one of the light sources 6 and 7 from being interfered by the other light source, and to constantly emit light stably. Therefore, the brightness difference between the light sources 6 and 7 caused by the current leak of the two light sources 6 and 7, the variation in the surface brightness of the light diffusion surface 1 a of the light guide plate 1 caused by the mismatch of the gradation pattern of the irregular reflection member 4, and the like In addition, it is possible to prevent a decrease in luminance per power consumption.

By making the surface of the light source holder 11 facing the light source have light reflectivity, the light of the light sources 6 and 7 can be reflected toward the light guide plate 1. The light source holder 11 has sockets 6 at both ends as shown in FIG.
a, 7a are provided, and the light sources 6, 7 are supported by the opposed sockets 6a, 7a, respectively.
At this time, terminals connected to the terminals of the light sources 6 and 7 are formed in the sockets 6a and 7a.

FIG. 5 is an exploded perspective view showing the light source unit 10 of the two-light edge light type illuminating device 14 at both ends after the light source unit 10 is extracted. FIG. 6 is a perspective view showing a method of attaching and detaching the light source unit 10. The two-light edge-light illuminating device 14 at both ends is arranged in the order of the main chassis 8, the lens sheet 5, the diffusion sheet 2, the light guide plate 1, the reflection sheet 3, and the sub-chassis 9 from the liquid crystal display element 13 side. The arranged components are sandwiched between the main chassis 8 and the sub-chassis 9, and the liquid crystal display element 1 of the sub-chassis 9 is provided.
3 is fixed by screws 12 from the opposite side.

Cutouts 18 and 19 are formed on the side walls 8a and 9a of the main chassis 8 and the sub-chassis 9, which are a pair of housings, which cover one side 1d of both sides different from the both sides 1c of the light guide plate 1. Each is formed. When the main chassis 8 and the sub-chassis 9 are fixed by the screws 12, the cutout 18 and the cutout 19 facing each other form an insertion opening 20 at at least one end of the lighting device main body 15. In this embodiment, the insertion ports 20 are formed at both ends. The light source unit 10 is moved in the longitudinal direction 10 a of the insertion port 20 with respect to the lighting device body 15 by the insertion port 20.
The slide type is detachable.

Therefore, when replacing the light sources 6 and 7, there is no need to remove the sub-chassis 9 fixed with the screws 12 and disassemble the illumination device main body 15 as in the conventional case.
By extracting only 0 from the lighting device body 15,
It can be easily performed in a short time. Light sources 6 and 7
Since the surroundings are covered by the light source holder 11, the number of times the operator directly touches the hand is reduced, and the handling is facilitated.
The damage of the light sources 6 and 7 can be prevented, and the working efficiency is improved.

FIG. 7 is a cross-sectional view of a two-edge edge light type illuminating device 37 at both ends according to another embodiment of the present invention.
FIG. 8 is an enlarged cross-sectional view of the area 38 shown in FIG.
The illuminating device 37 shown in FIGS. 7 and 8 is a two-edge edge light type illuminating device 14 shown in FIGS.
And the configuration of the light source unit 39 including the light source holder 44 is different. Therefore,
The configuration of the light source unit 39 and the mounting operation of the light sources 6 and 7 to the light source holder 44 will be described. Further, the same constituent members will be described with the same reference numerals.

FIG. 9 is a perspective view of the light source unit 39.
The light source unit 39 includes light sources 6 and 7, sockets 6a and 7
a, light source holder 44, wiring board 41, cables 49, 5
2 and a connector 43. The light source holder 44 has one concave curved surface portion 40 for each light source on the reflection surface facing the light sources 6 and 7. The curved surface portion 40 is effectively used when a space for providing the protrusion 11a between light sources cannot be secured. Most of the light from one of the two light sources 6 and 7 mounted on the lighting device, for example, the light from the light source 6 is reflected by the reflection surface having the curved portion 40 and is incident on the light guide plate 1. So
The other light source 7 is hardly affected. The same applies to the light source 7. For this reason, it is possible to prevent a difference in luminance between the light sources and a decrease in luminance per power consumption, and it is possible to emit light more stably than the conventional lighting device 34 in which one reflecting surface is provided for a plurality of light sources. is there.

Next, the shape of the light source holder 44 and the state of the wiring will be described with reference to FIGS. 9, 10, and 11. FIG. FIG. 10A is a rear view of the light source holder 44 on which the wiring board 41 is provided, and FIG.
FIG. FIG. 10C is a front view showing the opening side of the light source holder 44 in which the light sources 6 and 7 are mounted.
0 (d) is a side view of FIG. 10 (c) viewed from a cathode side end surface 44a described later. FIG. 10E is a front view showing the light sources 6 and 7. 11 (a) to 11
(C) is a cross-sectional line I- in FIG.
It is sectional drawing when the light source holder 44 is cut | disconnected by I, II-II, III-III.

The light source holder 44 includes a plurality of linear light sources,
In the present embodiment, two are held. The light source holder 44 includes a back plate 60 having substantially the same length as the light sources 6 and 7,
, And includes an upper plate 61 and a bottom plate 62 having the same length as the back plate 60. These top plate 61, back plate 60 and bottom plate 6
Due to 2, the shape of the light source holder 44 when viewed from the side is U-shaped. The light source is disposed and held inside a U-shaped portion surrounded by the top plate 61, the back plate 60, and the bottom plate 62.

The light source holder 44 is provided with a curved surface portion 40. Specifically, the light source side surface of the back plate 60 is formed in a concave curved shape along the light source surface to form the curved surface portion 40. The curved surface portion 40 is provided for each light source held.

The light source holder 44 is provided with a support member 45. More specifically, the protrusions are further protruded from the protrusions between the curved surface portions 40 provided on the back plate 60 at both ends in the longitudinal direction of the back plate 60.
The light source 6 disposed on the upper surface plate 61 side of the two light sources 6 and 7 includes an upper surface plate 61, a rear plate 60, and a curved surface portion 40.
And the other light source 7 disposed on the bottom plate 62 side is surrounded by the convex portion between the bottom plate 62, the rear plate 60, and the curved shape portion 40 and the support member 45. And is kept. Therefore, the upper plate 6
1. It is possible to prevent the light sources 6 and 7 from falling off from the open portion in the space surrounded by the back plate 60 and the bottom plate 62. The light source 6, by forming the light source side surface of the support member 45 into a concave curved shape along the light source surface.
7 can be stably held. Thus, even if vibration is applied, the light sources 6 and 7 do not come off or come off the light source holder 44 and are not damaged, so that handling becomes easy.

The light source holder 44 is provided with notches 53 and 54. Specifically, the back plate 60
Are provided at both ends in the longitudinal direction. By the notch 53 provided on the cathode side of the held light sources 6 and 7,
FIG. 1 is provided on a side opposite to the light source with respect to the back plate 60.
3, glass epoxy resin layer 46, copper foil layer 4
7. The wiring board 41 having a three-layer structure of the epoxy-based ink material layer 48 is exposed. At this time, the epoxy-based ink material is used as an adhesive, and the wiring board 41 is attached so that the epoxy-based ink material layer 48 is in contact with the back plate 60. The respective cathodes of the held light sources 6 and 7 are connected to the exposed terminals of the wiring board 41 by solder, respectively, and are led to the anode sides of the light sources 6 and 7 by the wiring formed on the wiring board 41 to form a single unit. It is connected to the cable 49 by soldering.
The cable 49 is led out to the opening side of the light source holder 44 via a cutout 54 provided on the anode side of the held light sources 6 and 7. On the other hand, each anode of the held light sources 6 and 7 is directly led out to the opening side of the light source holder 44 by two cables 52. The cables 49 and 52 thus led out are both connected to the connector 43. Therefore, it is not necessary to pull out the cable line from the cathode side, which is the insertion end of the light source holder 44 into the lighting device main body 15, whereby the cable line is pinched or inserted between the entrance of the insertion port 20 of the main body and the light source holder 44. Breakage of the cable line caused by rubbing between the inner wall of the opening 20 and the light source holder 44 is eliminated. Therefore, attachment and detachment of the light source holder 44 to and from the lighting device main body 15 become smooth.

More specifically, only the light source unit 39 is detached from the lighting device 37, and the cathode connection 51 connects the cathode terminal 51 of the light source to the wiring board 41 at the cathode end 44a.
At the anode side end 44b, by taking the solder connection between the anode terminal 55 of the light source and the anode cable 52, respectively,
The light sources 6 and 7 can be removed from the light source holder 44 and the light sources can be replaced.

The connector 43 is connected to an external power supply (not shown), and a power supply voltage is supplied to the light source unit 39. Alternatively, when the lighting device 37 is used in combination with the liquid crystal display element 13 having a power supply circuit, the connector 43 is connected to the power supply circuit of the liquid crystal display element 13 so that the power supply voltage is supplied to the light source unit 39. It may be.

FIG. 12 is a perspective view showing a method of attaching / detaching the light source holder 44 to / from the lighting device main body 15. The light source can be attached to and detached from the illumination device main body 15 by sliding the light source holder 44 in the longitudinal direction 10a of the insertion port 20 of the illumination device 37 with the cathode end 44a as a tip.
By providing the wiring board 41, the cable lines 49 and 52 from both poles are put together on the anode side, so that the light source holder 44 does not catch on the cable line during attachment / detachment.
Therefore, similarly to the above embodiment, the light source unit 39 can be removed from the lighting device 37, and the light sources 6, 7 can be easily replaced.

In this embodiment, the side wall 57 is provided between the notch 53 of the cathode end 44 a of the light source holder 44 and the reflection curved surface portion 40. Specifically, the side wall 57
The light source holder 44 protrudes from the light source side surface of the rear plate 60 and is provided between the upper surface plate 61 and the bottom plate 62 along a direction perpendicular to the longitudinal direction of the light source holder 44. The side wall 57 has a notch 56, from which only the cathode terminals 51 of the light sources 6 and 7 protrude, and are soldered to the wiring board 41 as described above. Side walls 57 are provided with light sources 6 and 7
Of the light sources 6 and 7 are determined, and the arrangement positions of the light sources 6 and 7 in the light source holder 44 are determined.

In the present embodiment, since the light source holder 44 has the support member 45, the sockets 6a, 6a, Light sources 6 and 7 having 7a are inserted and mounted. Since the sockets 6a and 7a are made of a material having a cushioning property such as rubber, the light sources 6 and 7 are held by the light source holder 44 by being fitted in the space formed by the light source holder 44 and the support member 45. You. At this time, the anode terminals 55 of the light sources 6 and 7 are connected to the cable wires 52 by making cuts or making holes in the sockets 6a and 7a. When there is no support member 45 as in the above-described embodiment, sockets 6a and 7a are installed at both ends of the light source holder 44, and the socket 6
The light sources can also be mounted from the opening side of the light source holder 44 such that the light sources 6 and 7 are held only by the light sources a and 7a.
At this time, as in the case of the above embodiment, the socket 6
Connection terminals are formed on the terminals a and 7a, and the connection terminals are connected to the anode terminals 55 of the light sources 6 and 7, respectively.

The reflection curved surface portion 40 of the light source holder 44 is
As long as it has a concave shape facing the light source, any curved surface shape has the effect of preventing electromagnetic field interference with other light sources, but a reflective curved surface is formed concentrically from the central axis of the light source. It is particularly preferred to do so. Further, it is preferable that the distance between the light source and the reflection curved surface portion 40 is selected to be about 0.5 to 1.0 mm.

FIG. 13 is a sectional view of the wiring board 41.
The wiring board 41 is formed from the lowermost layer to the glass epoxy resin layer 4.
6, a copper foil layer 47 and an epoxy-based ink material layer 48 are laminated in this order. Glass epoxy resin uses glass fiber as a reinforcing material and increases the hardness of the resin. The wiring board 41 is realized as follows.
First, a copper foil is placed on the glass epoxy resin layer 46 and placed in a bath of about 80 degrees to allow the copper foil to adapt to the glass epoxy resin layer 46 to form a copper foil layer 47. Next, the copper foil layer 47
The epoxy-based ink material layer 48 is provided by printing (resist processing) the epoxy-based ink material thereon, and the wiring board 41 is formed. The epoxy ink material layer 48 forming the uppermost layer is used not only as an adhesive layer to the light source holder 44 as described above, but also as a copper foil layer 4 serving as a wiring.
7 is provided as a protective film layer.

The materials for forming the components of the lighting device will be described below. The light guide plate 1 can be realized using, for example, a transparent plastic made of acrylic resin, polycarbonate, silicon rubber, a polymer alloy thereof, or glass. The reflection sheet 3 is obtained by applying a paint containing a reflection material such as titanium oxide, silica, glass beads or the like to one or both sides of a support sheet made of, for example, polyethylene terephthalate, or aluminum or silver on a support sheet made of polyethylene terephthalate. And the like can be realized by evaporation. The diffusion sheet 2 can be realized by, for example, a sheet made of a resin compound in which a light diffusion material such as titanium oxide is contained in a transparent resin, or a sheet in which a paint containing a diffusing agent is applied to one or both sides of a transparent sheet. As the light sources 6 and 7, a cold cathode tube or a hot cathode tube can be used. The light source holders 11, 44 and the support member 45 are made of, for example, polycarbonate or ABS (Acrylonitrile-butadien).
e-styrene) and other highly reflective plastic resins. The support member 45 may be formed integrally with the light source holder 44 or may be attached to the light source holder 44 later. The main chassis 8 and the sub-chassis 9 can be realized by a plastic resin such as polycarbonate or ABS, for example. The sub-chassis 9 includes, for example, galvanized steel sheet, aluminum,
A metal material such as stainless steel may be used. The sockets 6a and 7a are formed of a material having a buffer property such as rubber.

In the above-described two embodiments, the case where two light sources are arranged on both side surfaces 1c of the light guide plate 1 has been described. However, even if three or more light sources are arranged, the light source Projection 11 having light reflecting and insulating properties
A stable light can be obtained by disposing a in the same manner or by providing one reflection curved surface each facing the light source. Further, even if the number of light sources arranged on both side surfaces 1c of the light guide plate 1 is one, or three or more, or the light source is arranged only on one side surface of the light guide plate, Similarly, the light source can be easily exchanged by supporting the light source with a light reflecting and insulating light source holder. Further, in these two embodiments, the case where the display device is used as a lighting device for a liquid crystal display device has been described. However, the display device is not limited to liquid crystal, and may be another light-receiving display device.

The provision of a support member 45 for reinforcing the holding of the light sources 6 and 7 on the light source holder 11 having the projection 11a is also included in the scope of the present invention. Similarly, attaching the wiring board 41 to the back surface of the light source holder 11 having the projection 11a also belongs to the scope of the present invention.

[0057]

As described above, according to the present invention, an insulating member having light reflectivity is arranged between a plurality of light sources provided on one side surface of the light guide means, so that each light source is insulated. Stable light emission can always be obtained without interference from electric and magnetic fields generated from other light sources. Further, it is possible to prevent a luminance difference between the light sources caused by a current leak between the light sources, a variation in surface luminance caused by an inconsistent gradation pattern of the irregular reflection member, a decrease in luminance per power consumption, and the like.

Further, according to the present invention, when the pair of housings are fixed to each other, the holding means forms the insertion opening through which the holding means can be detachably inserted. By extracting the lighting device from the lighting device main body, it can be easily performed in a short time. Further, since the light source is held and covered by the holding means, the handling is easy, the damage of the light source can be prevented, and the working efficiency can be improved.

According to the present invention, a plurality of light sources provided on one side surface of the light guiding means are held by the holding means, and the holding means has a light reflecting and insulating projection disposed between the light sources. Since the part was formed, each light source can be supported,
And each light source is insulated. Therefore, since there is no interference of electric and magnetic fields generated from other light sources, current leakage does not occur and stable light emission can be obtained at all times. It is possible to prevent a decrease in brightness per unit area. Further, the pair of housings has an insertion opening through which the holding means is detachably inserted when they are fixed to each other, so that the holding means can be extracted from the lighting device main body, and the light source can be easily and quickly replaced. . Since the extracted holding means covers the light source, it is easy to handle, prevents damage to the light source, and improves work efficiency.

Further, according to the present invention, a plurality of light sources are collectively held by holding means having a curved surface having light reflectivity facing each light source. Light emitted from each light source is reflected by each reflection curved surface of the holding means, and most of the light is incident on the light guide means. Therefore, compared with a conventional lighting device in which light from a plurality of light sources is reflected by a single reflecting surface, interference of electromagnetic fields between the light sources is reduced, and current leakage hardly occurs, so that relatively stable light emission is obtained. Obtainable. This can solve the problems of the lighting device having a plurality of light sources, such as a difference in luminance between the light sources.
The curved shape is suitably used when a space for providing the protrusion between light sources cannot be secured.

Further, according to the present invention, the holding means having a reflection curved surface facing each light source can slide the insertion opening formed when the pair of housings are fixed to each other. The holding means can be attached to and detached from the lighting device body. Therefore, it is possible to obtain a lighting device having a relatively stable light emission characteristic, in which light sources can be easily replaced.

Further, according to the present invention, since the holding member is formed with the support member for assisting the holding of the light sources, each light source can be held more reliably in the holding means. As a result, the possibility that the light source escapes from the arrangement position in the holding means and is damaged due to vibration applied to the lighting device and the holding means is reduced,
A lighting device resistant to vibration can be realized. Further, the light source can be easily replaced.

Further, according to the present invention, a support member is further provided so as to protrude from the protrusion disposed between the light sources. Therefore,
The light source can be more reliably held in the holding means, and an easy-to-handle lighting device as described above can be obtained.

Further, according to the present invention, a support member is further provided to project from the convex portion between the curved surfaces of the holding means. This also allows the light source to be reliably held as described above.

Further, according to the present invention, one terminal of the light source can be guided to the other terminal side by the wiring board provided on the back surface of the holding means, so that it is not necessary to use cable wiring. Therefore, the cable wiring is not caught between the holding means and the side wall of the insertion port of the lighting device,
When replacing the light source, the holding means can be easily attached and detached. In addition, there is no disconnection in the cable wiring.

[Brief description of the drawings]

FIG. 1 is a plan view of a two-light edge light type illumination device 14 at both ends according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the two-end edge light type illumination device 14 at both ends when cut along a cutting plane line AA shown in FIG.

FIG. 3 is an enlarged sectional view showing a region 16 shown in FIG. 2 of the two-edge edge light type illumination device 14 at each end.

FIG. 4 is a perspective view showing a light source unit 10, which is a constituent member of the two-light edge light type illumination device 14 at each end.

FIG. 5 is an exploded perspective view of the light source unit 10 of the two-light edge light type illumination device 14 at both ends after the light source unit 10 is extracted.

FIG. 6 is a perspective view showing a method of attaching and detaching the light source unit 10.

FIG. 7 is a cross-sectional view of a two-edge edge light type illuminating device 37 at both ends according to another embodiment of the present invention.

FIG. 8 is an enlarged sectional view showing a region 38 shown in FIG. 7 of the two-light edge light type illumination device 37 at each end.

9 is a perspective view of the light source unit 39. FIG.

10A is a rear view of a light source holder 44 on which a wiring board 41 is provided, FIG. 10B is a top view of the light source holder 44, and FIG. 10D is a front view showing the opening side of the light source holder 44 on which the light source is mounted, FIG. 10D is a side view of the light source holder 44 viewed from the cathode side end surface 44a in FIG. 10C, and FIG. 6,
It is a front view which shows 7.

FIG. 11C is a sectional view taken along lines II and I in FIG.
FIG. 3 is a sectional view when the light source holder 44 is cut along I-II and III-III.

FIG. 12 is a perspective view showing a method of attaching and detaching the light source holder 44 to and from the lighting device body 15;

FIG. 13 is a cross-sectional view of the wiring board 41.

FIG. 14 is a plan view of a conventional two-edge edge light type illumination device 34 at both ends.

FIG. 15 shows an edge-light type illuminating device 34 with two lights at each end.
FIG. 15 is a cross-sectional view taken along a cutting plane line BB shown in FIG. 14.

FIG. 16 shows a two-edge-edge-light type illuminating device 34 at each end.
FIG. 16 is an enlarged sectional view showing a region 36 shown in FIG. 15 of FIG.

FIG. 17 is a perspective view showing a method of attaching and detaching the light sources 26 and 27.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light-guide plate 2 Diffusion sheet 3 Reflection sheet 4 Diffuse reflection member 5 Lens sheet 6, 7 Light source 8 Main chassis 9 Sub-chassis 10, 39 Light source unit 11, 44 Light source holder 11a Projection 13 Liquid crystal display element 14, 37 Two edges at each end Light-type lighting device 18, 19 Cutout 20 Insertion port 40 Curved surface portion 41 Wiring board 42 Convex portion 43 Connector 45 Support member

Claims (9)

[Claims] A light source; a light guiding unit for guiding light from the light source to a display unit; a reflecting unit for reflecting light from the light source toward the light guiding unit; and at least the light source, the light guiding unit, and A pair of housings that are arranged on the display unit side and the opposite side to cover the reflection unit and are fixed to each other, and the display unit of one of the housings arranged on the display unit side of the pair of housings In a lighting device having a light-transmitting region opposed to the display surface, a plurality of the light sources are provided close to each other on at least one side of the light guide, and provided on a side of the light guide. A lighting device, comprising: an insulating member having light reflectivity disposed between the plurality of light sources. 2. A light source; a light guiding unit for guiding light from the light source to a display unit; a reflecting unit for reflecting light from the light source toward the light guiding unit; and at least the light source, the light guiding unit, and A pair of housings that are arranged on the display unit side and the opposite side to cover the reflection unit and are fixed to each other, and the display unit of one of the housings arranged on the display unit side of the pair of housings In a lighting device having a light-transmitting property, a region opposed to the display surface holds the light source, and a surface facing the light source includes a holding unit having a light reflective property. The pair of housings are fixed to each other. A lighting device characterized in that cutouts are formed as insertion holes through which the holding means are detachably inserted. 3. A light source; a light guiding unit for guiding light from the light source to a display unit; a reflecting unit for reflecting light from the light source toward the light guiding unit; and at least the light source, the light guiding unit, and A pair of housings that are arranged on the display unit side and the opposite side to cover the reflection unit and are fixed to each other, and the display unit of one of the housings arranged on the display unit side of the pair of housings In a lighting device having a light-transmitting region facing the display surface, a plurality of the light sources are provided adjacent to each other on at least one side surface of the light guide unit, and the plurality of light sources are collectively held. A surface facing the light source is a holding unit having light reflectivity, the holding unit having a light reflective and insulating protrusion disposed between the plurality of light sources; Are fixed to each other Said holding means is insertion opening for inserting detachably cutout are formed in the illumination apparatus according to claim. 4. A plurality of light sources, and a plurality of said light sources are held close to each other and collectively,
Holding means having a curved surface having light reflectivity respectively opposed to each light source, and arranged to face the display means, and the light source held by the holding means is arranged on at least one side, and A light guide unit for guiding light to a display unit; a reflection unit disposed on a side of the light guide unit opposite to the display unit, for reflecting light from the light source toward the light guide unit; A pair of housings, which are arranged on the display means side and the opposite side thereof, respectively, and are fixed to each other,
An illumination device, wherein at least a region of the housing which is disposed on the display means side of the pair of housings and which faces at least a display surface of the display means includes a pair of light-transmitting housings. 5. The lighting device according to claim 4, wherein the pair of housings are formed with cutouts each serving as an insertion opening through which the holding unit is removably inserted when fixed to each other. 6. The lighting device according to claim 2, wherein the holding means is provided with a support member for assisting holding of the light source. 7. The lighting device according to claim 3, wherein a supporting member for assisting holding of the light source is further provided from the protrusion of the holding means. 8. The lighting device according to claim 4, wherein a supporting member for assisting holding of the light source is further provided protruding from a convex portion of each curved surface of said holding means. 9. The lighting device according to claim 2, further comprising a wiring board disposed on a back surface of said holding means and formed with wiring from a held light source.