JPH0877818A - Lighting device - Google Patents

Abstract

PURPOSE: To effectively use lamp light and improve its maintainability. CONSTITUTION: A lighting device comprises a base board 2 attached to a main body 1, a display panel 4 having a light guide board 40 whose one face is set to a diffusion reflection face, a lamp 30 which radiates light from the end face of the light guide board 40 to the inside of the light guide board, and a reflection board 35 which surrounds the lamp and guides the lamp light to the end face of the light guide board. The reflection board 35 is integrally provided with a lamp holder 36 for holding the lamp 30, and the reflection board 35 and the display panel 4 are fixed to the base board 2. Positional relation between the lamp and the light guide board in the display panel is hard to deviate, the lamp held by the lamp holder which is integrally provided with the reflection board is easy to handle, and the positional relation between the lamp and the reflection board is constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device, and more particularly to an illuminating device which has a display panel having a light guide plate and illuminates the display panel by allowing lamp light to enter the light guide plate from its end face.

[0002]

2. Description of the Related Art As an illuminating device, there is an illuminating device provided with a display panel having a light guide plate which reflects the lamp light incident from the end face on the back side and guides it to the front side. Such a lighting device can be used as a guide light.

[0003]

However, in the conventional illuminating device of this type, since the substrate to which the display panel is fixed is attached to the main body to which the lamp is fixed, the lamp and the display panel are not fixed. The positional relationship of the light guide plate is likely to shift, and the light of the lamp often leaks without entering the light guide plate. There is also a problem in maintainability when replacing the lamp.

The present invention has been made in view of the above points, and an object of the present invention is to provide a lighting device which can effectively use lamp light and is excellent in maintainability.

[0005]

SUMMARY OF THE INVENTION According to the present invention, however, a display having a main body provided with a lighting device and a terminal block for power supply connection, a substrate attached to the main body, and a light guide plate having one surface as a diffuse reflection surface. An illumination device comprising: a panel, a lamp that allows light to enter the light guide plate from an end face of the light guide plate, and a reflector plate that surrounds the lamp and guides the light of the lamp to the end face of the light guide plate. Is integrally provided with a lamp holder for holding a lamp, and is characterized in that the reflector and the display panel are fixed to the substrate.

[0006]

According to the present invention, since the lamp unit and the display panel are both fixed to the substrate, the positional relationship between the lamp and the light guide plate in the display panel is unlikely to shift, and the lamp is different from the reflector plate. Since it is held by the integrated lamp holder, it is easy to handle, and it is easy to maintain the positional relationship between the lamp and the reflector that will affect the efficiency of light in a prescribed state. is there.

At this time, if an engaging member that detachably engages with an engaging portion provided on the substrate is provided on the reflecting plate as a means for attaching to the substrate, the lamp unit can be easily attached and detached.
When using a lamp holder that vertically holds two straight tube lamps, a pair of holding pieces that have elasticity and hold both lamps from the left and right are provided, and the holding portion on the upper stage side of the holding pieces is provided. If the distance between the lower holding portions is smaller than the distance, both lamps can be held securely.

When a cold cathode tube lamp is used as the lamp,
If you cover the electrode parts on both ends with bushings made of an insulating material and connect the lead wires that are drawn from the electrode parts and penetrate each bushing to the connector, the exposed parts of the charging part will not be exposed and the lamp will be handled more easily. It will be easy. It is preferable that the bushing comprises a cylindrical portion surrounding the outer periphery of the end of the lamp and a square portion located at the end.

Further, if a wiring holding portion for the lead wire drawn out from the end portion of the lamp is provided on the reflector, the processing of the lead wire is facilitated, and if a heat dissipation hole is provided, heat dissipation can be achieved. This is advantageous, and by providing the inner surface with the claw portion formed by utilizing this heat dissipation hole, the reflection sheet can be reliably held when the reflection sheet is attached to the inner surface of the reflection plate.

If the reflecting plate provided on the inner surface of the reflector plate is coated with an acrylic resin on the lamp side surface, the light utilization efficiency can be further improved. If the diffuse reflection surface of the light guide plate in the display panel is formed by a reflection sheet that covers one surface and the end surface of the light guide plate, and if the reflection sheet arranged on each surface is integrally formed, unnecessary leakage of light in the display panel will occur. It becomes easy to prevent.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the illustrated embodiments. In FIG. 1, reference numeral 1 denotes a box-shaped main body having an opening on the bottom surface, in which a lighting device 10 and a power source connection are connected. A terminal block (not shown) for use is fixed. The main body 1 is fixed to the ceiling surface or is hung from the ceiling surface, and has locking projections 11 and 11 on the inner surfaces at both ends in the longitudinal direction.

A substrate 2 is arranged on the opening surface of the main body 1. The base plate 2 connected to the main body 1 by locking the mounting springs 20 mounted on the upper surfaces of both ends in the longitudinal direction with the locking projections 11 of the main body 1 has a long hole for mounting the display panel 3 in the center thereof. 21 and a mounting piece 22 that rises upward from the edge of the long hole 21. The lamp unit 3 and the display panel 4, which will be described later, are attached to the attachment piece 22.

The display panel 4 comprises a transparent light guide plate 40, a reflection sheet 41, and a panel 42. The reflection sheet 41 is formed on one surface of the light guide plate 40 and both end surfaces and a lower end surface thereof, as shown in FIG. For convenience, the one that covers the four surfaces is integrally formed. Further, the panel 42 is formed in a rectangular tube shape or a rectangular tube shape with a bottom, and the display panel 4 is configured by housing the light guide plate 40 on which the reflection sheet 41 is mounted in the panel 42. The display panel 4 is attached by inserting the upper end of the display panel 4 into the elongated hole 21 and inserting a fixing screw 48 into the attachment piece 22 and the display panel 4.

The reflection sheet 41 here has high diffusion and
It is made of a film-like sheet made of a highly reflective material, for example, polyethylene terephthalate resin, and covers four surfaces except the upper surface which becomes the light incident surface and the surface which becomes the light emitting surface, and these four surfaces are made diffuse reflective surfaces. Since the diffusive reflection surface is formed by the reflection sheet 41 which is a film-like sheet, it is possible to configure a lightweight and thin structure and to reduce the cost. Especially the light guide plate 4
Since the portion that covers the side end surface and the lower end surface of 0 is also integrated, the light can be effectively used and the display unit 4 can be easily assembled.

The lamp unit 3 includes a straight tube type lamp 30 which is a cold cathode tube lamp, a reflecting plate 35 which is a synthetic resin molded product, and a reflecting sheet 3 which is disposed on the inner surface of the reflecting plate 35.
And 4. As shown in FIGS. 3 and 4, the lamp 30 has a bushing 31 made of an insulating material covering the cap portions at both ends which are electrode portions, and the bushing 31 covers the outer peripheral surface of the end portion of the lamp 30. Cylindrical part 32
A pair of lead wires 51, which are connected to the electrodes on both ends of the lamp 30, respectively, and are connected to the connector 52 by being drawn out through the bushings 31. The connector 52 is detachably connected to the connector 15 connected to the lighting device 10 in the main body 1. Since the bushing 31 covers the end portion of the lamp 30, that is, the end portion of the lamp 30 where blackening occurs at the end of its life is covered with the bushing 31 from the beginning, the luminous flux is not enough until the lamp 30 reaches the end of its life. It does not decrease.

The reflection plate 35 has an inverted U-shaped cross section that surrounds the left and right sides and the upper side of the lamp 30, is formed as a synthetic resin molded product, and as shown in FIG. 5, has an elastic lamp holder. 36 are integrally formed at both ends in the longitudinal direction, and mounting hooks 37 extending downward and projecting pieces 55 extending upward are integrally formed on the outer surfaces of both ends. Further, a locking claw 39 is provided on the inner surface side, and a heat dissipation hole 38 is provided on the upper side. As is apparent from FIG. 5B, the locking claws 39 are for locking the reflection sheet 34 arranged on the inner surface of the reflection plate 35, and a plurality of locking claws 39 are provided on both sides. The heat radiation holes 38 are holes provided for molding the locking claws 39 serving as undercut parts, and are used for heat radiation, and the same number as the locking claws 39 is provided. ing.

The reflection sheet 34 is for making the inner surface of the reflection plate 35, which is a synthetic resin molded product, a reflection surface, and is made of a film-like sheet made of a highly diffusive and highly reflective material such as polyethylene terephthalate resin. When arranged on the inner surface of the plate 35, it is mounted along the inner surface of the reflector plate 35 by the locking of the edge by the locking claw 39 and the elasticity of itself as described above, and diffuses and reflects the light of the lamp 30. Reference numeral 340 in the drawing denotes an engaged portion which is an engaging portion with the locking claw 39 in the reflection sheet 34.

As shown in FIG. 6, in the lamp 30, the cylindrical portions 32 of the bushings 31 arranged at both ends of the lamp 30 are held by the lamp holders 36, so that the reflecting plate 3 is formed.
The lamp unit 3 is attached to the lamp unit 5 as shown in FIG. Since the lamp holder 36 is integrally formed with the reflecting plate 35, the relative positional relationship between the reflecting plate 35 and the lamp 30 is reliably determined, and the portion where the lamp holder 36 engages is the cylindrical portion 32. Therefore, even if the lamp 30 is mounted on the reflection plate 35 while being rotated by an angle θ from the original angle as shown in FIG.
The relative position between 0 and the reflection plate 35 is maintained, and the position of the lamp 30 in the longitudinal direction is maintained at a predetermined position by the rectangular portion 33 of the bushing 31 hitting the lamp holder 36. Furthermore, since the lamp holder 36 is composed of a pair of arcuate holding pieces, the lamp 30
The holding force can be kept constant in all directions in the cross-sectional direction of. As shown in FIG. 7, the projecting piece 55 of the reflection plate 35 has a lead wire 5 led out from the lamp 30.
Used for positioning and holding 1. In this way, the lead wire 5
When the positioning of No. 1 is performed, it is possible to suppress the output reduction due to being drawn around the lead wire 51, and the lead wire 51 does not become an obstacle during the assembly or the like. The square portion 33 of the bushing 31 is the lamp 30.
It also has a role of ensuring stability when stacking the lamps and preventing contact between the lamps 30.

In the lamp unit 3, as shown in FIG. 8, a mounting hook 37, which is integrally provided on the reflector 35 and has a hinge at the base, is mounted on the mounting piece 2 of the substrate 2.
It is attached to the substrate 2 by being locked in the engagement hole 24 provided in the substrate 2. By attaching with the attaching hook 37, one-touch attachment / detachment is possible. The attachment hook 37 may be engaged with the engagement hole 24 by its elasticity, and as shown in FIG. 9, the pin 60 provided on the reflection plate 35 is replaced with the key-type engagement provided on the attachment piece 22. It may be performed by engaging with the groove 25. Other mounting structures may be used, but it is preferable in terms of replacement and maintenance of the lamp 30 that it can be attached and detached with one touch. When replacing the lamp 30, since the replacement is performed with the bushing 31 still attached, the charging part of the lamp 30 is not exposed and the connector 52 is used. It can be done without it.

However, in this lighting device, as shown in FIG.
As shown in FIG. 0, if the lamp 30 faces the upper end surface of the light guide plate 40 in the display panel 4 and the lamp 30 is turned on, the light emitted from the lamp 30 may be emitted directly or from the reflector plate 3.
After the diffuse reflection by the reflection sheet 34 on the inner surface 5, the light guide plate 4
0 enters the light guide plate 40 from the upper end face thereof, and is diffused and reflected by the reflection sheet 41 located on the back face, the left and right end faces and the lower end face of the light guide plate 40, and then emerges from the front face of the light guide plate 40. Therefore, the portion of the panel 42 that covers the front surface side of the light guide plate 40 is illuminated from the back surface.

At this time, the display panel 4 and the lamp unit 3 are both mounted on the substrate 2, and therefore, the positional relationship between the lamp 30 and the upper end surface of the light guide plate 40 can always be kept good. Since the lower end of the reflection plate 35 of the lamp unit 3 covers the upper end portion of the light guide plate 40 located inside the mounting piece 22 of the substrate 2, the light from the lamp 30 reaches the light guide plate 40. It rarely leaks outside without incident.

In this lighting device, the lamp 3
When it is necessary to replace 0, the substrate 2 attached by the spring 20 to the lower surface opening of the main body 1 is pulled down to temporarily suspend the substrate 2 from the main body 1. After the lamp unit 3 on the upper surface side is removed from the substrate 2 and the lamp 30 is replaced, the lamp unit 3 is mounted on the substrate 2 again, the substrate 2 is pushed back toward the main body 1 side, and the substrate 2 is locked by the spring 20. The display panel unit 4 does not have to be removed from the substrate 2 simply by positioning it in the opening of the main body 1.

A reflection sheet 34 provided on the inner surface of the reflection plate 35.
A transparent coating layer of acrylic resin may be formed on the surface of the above, that is, the surface on the lamp 30 side. Such a coating layer prevents deterioration of the reflection sheet 34 due to ultraviolet rays, and since light exceeding the critical reflection angle of the acrylic resin is totally reflected as shown in FIG. 11, the efficiency is high. The lamp unit 3 shown in FIG. 12 shows one in which two lamps 30, 30 in a reflector 35 are arranged side by side vertically.
A lamp holder 36 integrally provided with the reflector 35
By making the two arcuate parts continuous vertically,
The two lamps 30, 30 can be held at the same time. Here, the inner diameter r1 of the holding portion of the upper lamp 30 in the lamp holder 35 is also the lower lamp 3
The inner diameter r2 of the holding portion of 0 is also smaller than the outer diameter R of the cylindrical portion 32 of the bushing 31 of the lamp 30, but the inner diameter r2 is smaller than the inner diameter r1. The vertical pitch R1 on the lamp holder 36 side is larger than the diameter (2R) of the cylindrical portion 32. To be exact, r2 <r1 ≦
R, 2R ≤ R1 and r1 when the upper lamp 30 is installed
Even when = R, the relation of r2 <R is maintained. That is, by holding the upper lamp 30 by the lamp holder 36, even if the lower side of the lamp holder 36 expands, the lower lamp 30 does not become uncertainly held by the lamp holder 36. That is why. When r2 <R ≦ r1, the upper stage can be attached with a slight clearance so that the lower stage diameter r2 does not spread and fall while the upper stage bushing 30 is stopped.

The lamp holder 36 shown in FIG. 13 (b) is
Up and down 2 to correspond to the display panel 4 that uses both sides
When using the row lamps 30, 30 in two rows, in this case, by providing a thick piece in the center and thin arc-shaped pieces on the left and right, the thick piece in the center that does not bend to the left and right The distance between the left and right lamps 30, 30 can be determined as a reference.

The display panel 4 using both sides has two light guide plates 40, 40 each having a diffuse reflection portion 43 formed by dot printing on one surface, as shown in FIG. 14, for example.
Are stacked so that the diffuse reflection portions 43 face each other, the side end face and the lower end face are covered with the reflection sheet 41, and this is attached to the panel 42. The two kinds of wire holders 58 shown in FIG. 15 stabilize the lamp current by keeping the distance between the two lead wires 51, 51 connected to the pair of electrodes of the lamp 30 at a certain distance (for example, 5 mm) or more. It is intended to keep the lamp brightness constant when multiple lights are used, and is attached to the inner surface of the main body 1 or the outer surface of the reflector plate 35.
The lead wire 51 drawn from the lamp 30 and the lead wire 51 from the lighting device 10 to the connector 15 are held. Reference numeral 59 in the figure denotes a groove for fitting the lead 51. The wire holder 58 may be formed integrally with the reflection plate 35.

[0026]

As described above, in the present invention, since the lamp unit and the display panel are fixed to the substrate, the positional relationship between the lamp and the light guide plate in the display panel is unlikely to shift, and therefore the lamp is It is possible to efficiently inject the light of the above into the light guide plate from the end face of the light guide plate, and because the lamp is held by the lamp holder that is integrated with the reflector plate, its handling is easy and maintainability is improved. In addition, it is easy to maintain the positional relationship between the lamp and the reflector, which affects the efficiency of light, in a predetermined state, and the display panel can be brightened also in this respect.

At this time, if an engaging member that removably engages with an engaging portion provided on the substrate is provided on the reflecting plate as a means for attaching to the substrate, the lamp unit can be easily attached to and detached from the substrate. Maintainability is high. When using a lamp holder that vertically holds two straight tube lamps, a pair of holding pieces that have elasticity and hold both lamps from the left and right are provided, and the holding portion on the upper stage side of the holding pieces is provided. If the spacing of the holding part on the lower side is smaller than the spacing,
Even if the holding portion for the lower lamp is widened by the upper lamp, the lower lamp can be held, and both lamps can be held reliably.

When a cold-cathode tube lamp is used as the lamp, both end electrodes are covered with bushings made of an insulating material,
It is preferable to connect a lead wire that is drawn from the electrode portion and penetrates each bushing to the connector. Since the exposed portion of the charging section is not exposed, the lamp can be handled more easily, and even a non-specialized person can replace the lamp.

The bushing is composed of a cylindrical portion that surrounds the outer periphery of the end of the lamp and a square portion that is located at the end. When the bush is held by the lamp holder, the lamp loses directionality. At the same time, the position of the lamp becomes stable. In addition, the square shape of the lamp ensures stability during stacking. Furthermore, if a wire holding part for the lead wire pulled out from the end of the lamp is provided on the reflection plate, the processing of the lead wire is facilitated and the lead wire does not interfere with the assembly. be able to. Providing a heat dissipation hole on the reflector plate is advantageous in terms of heat dissipation from the lamp, and providing a claw on the inner surface of the reflector plate ensures that the reflection sheet is secured when the reflection sheet is attached to the inner surface of the reflector plate. Can be held at. If the heat radiation holes are used for molding the claw portions, a very rational configuration can be obtained.

If an acrylic resin coating is applied to the lamp-side surface of the reflecting sheet provided on the inner surface of the reflecting plate,
The absorption of ultraviolet rays by the coating layer can prevent deterioration of the reflection sheet due to ultraviolet rays, and the total reflection of light having a critical angle or more can further improve the light utilization efficiency.
If the diffuse reflection surface of the light guide plate in the display panel is formed by a reflection sheet that covers one surface and the end surface of the light guide plate, and if the reflection sheet arranged on each surface is integrally formed, unnecessary leakage of light in the display panel will occur. This makes it easy to prevent the occurrence of the problem, and it is possible to reduce the thickness of the display panel and ensure good assembly.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment.

2A and 2B show a display panel of the above, wherein FIG. 2A is an exploded perspective view and FIG. 2B is a development view of a reflection sheet.

FIG. 3 is a view showing a lamp and a bushing of the same as above, (a)
Is an exploded perspective view, and (b) is a perspective view.

FIG. 4 is a sectional view of the lamp and bushing of the same.

5A and 5B show the above lamp unit, FIG. 5A is an exploded perspective view, and FIG. 5B is a sectional view of a reflection plate.

6A and 6B show the relationship between the lamp and the lamp holder of the above, wherein FIG. 6A is a perspective view, FIG. 6B is a side view, and FIG. 6C is a sectional view.

FIG. 7 is a perspective view of the above lamp unit.

FIG. 8 is an exploded perspective view of the same reflector and substrate.

FIG. 9 is an exploded perspective view showing another example of the above-described reflector mounting structure.

FIG. 10 is a schematic sectional view of the above.

FIG. 11 is a cross-sectional view of another example of the above reflector.

FIG. 12 is an exploded perspective view of a lamp unit of another embodiment.

FIG. 13 (a) is an explanatory view showing a dimensional relationship between the lamp holder and the lamp, and FIG. 13 (b) is a front view of the lamp holder when the lamps are arranged in two rows.

FIG. 14 is an exploded perspective view of a light guide plate and a reflection sheet in a double-sided display panel.

15A and 15B are perspective views of a lead wire holder.

[Explanation of reference numerals] 1 main body 2 substrate 4 display panel 30 lamp 35 reflector 36 lamp holder 40 light guide plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideki Mori 27, Nishi-shichijo-Hachiman-cho, Shimogyo-ku, Kyoto Within Kloy Electric Co., Ltd. (72) Inventor, Kinyuki Murase, 1048, Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Works Co., Ltd. (72) Inventor, Katsumi Watanabe, 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd.

Claims (9)

[Claims] 1. A main body provided with a lighting device and a terminal block for power supply connection, a substrate attached to the main body, a display panel having a light guide plate whose one surface is a diffuse reflection surface, and a light guide plate from an end surface of the light guide plate. An illuminating device comprising a lamp that allows light to enter the light plate and a reflector that surrounds the lamp and guides the light of the lamp to the end surface of the light guide plate, wherein the reflector integrally includes a lamp holder that holds the lamp. An illuminating device comprising: a reflection plate and a display panel fixed to the substrate. 2. The illuminating device according to claim 1, wherein the reflecting plate is provided with an engaging member that is detachably engaged with an engaging portion provided on the substrate, as a mounting means to the substrate. 3. The lamp holder is for holding two straight tube type lamps in a vertically stacked manner, and is provided with a pair of holding pieces which has elasticity and holds both lamps from the left and right,
2. The lighting device according to claim 1, wherein the holding portion of each lamp in the holding piece has a smaller gap between the holding portions on the lower side than a distance between the holding portions on the upper side. 4. The lamp is a cold-cathode tube lamp, and both end electrodes are covered with a bushing made of an insulating material.
The lighting device according to claim 1, wherein a lead wire that is drawn from the electrode portion and penetrates each bushing is connected to a connector. 5. A cold cathode tube lamp is provided with a bushing made of an insulating material, which covers the electrode portions at both ends of the lamp, and the bushing has a cylindrical portion surrounding the outer periphery of the end portion of the lamp and a rectangular shape located at the end portion. The lighting device according to claim 1, wherein the lighting device comprises: 6. The lighting device according to claim 1, wherein the reflector has a wiring holding portion for a lead wire drawn out from an end portion of the lamp. 7. The reflector is provided with a heat dissipation hole,
The lighting device according to claim 1, further comprising: a claw portion for holding the reflection sheet disposed on the inner surface of the reflection sheet, the claw portion being formed by using the heat dissipation hole. 8. The illumination according to claim 1, wherein the reflecting plate is provided with a reflecting sheet on the inner surface thereof, and the reflecting sheet has an acrylic resin coating on its lamp side surface. apparatus. 9. A diffuse reflection surface of a light guide plate in a display panel is formed by a reflection sheet covering one surface and an end surface of the light guide plate, and a reflection sheet arranged on each surface is integrally formed. The lighting device according to claim 1, which is characterized in that: