JPH06301034A - Back light device and assembling method therefor - Google Patents

Abstract

PURPOSE:To provide a device which is simplified in constitution, is reduced in size and thickness, is good in durability and is improved in luminance by providing the device with projecting pins (reference points) to be engaged with the holes of a light diffusion plate to position this light diffusion plate and fluorescent lamps. CONSTITUTION:The positioning hole parts XH, YH to be engaged with the positioning pins XP and YP mounted on lamp fixing plates 20a, 20b are formed in the lateral central positions of the light diffusion plate 60. Consequently, the fluorescent lamps are mounted with the positioning pins as a reference, dot pattern parts DPa to DPf formed on the light diffusion plate 60 are mounted with the fixing plates 20a, 20b for fixing the fluorescent lamps as a reference and the dot patterns are printed with the positioning analog as a reference and, therefore, the dot patterns are disposed opposite exactly to the positions of the fluorescent lamps. The positioning is executed with the exact positional relation between the fluorescent lamps and the dot patterns in this device and, therefore, the uniformity of light diffusion, i.e., the uniformity of the luminance on the diffusion plate is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device used as an illuminator for liquid crystal display panels, display panels and the like, and an assembling method thereof.

[0002]

2. Description of the Related Art A backlight device for a liquid crystal display panel is disclosed in, for example, Japanese Patent Application Laid-Open No. 1-241590. The backlight device includes an edge type and a direct type.

In the edge method, irregular reflection marks (light diffusion layers) are formed in a checkered pattern on the back surface of an acrylic light guide plate, and the reflection plates are laminated. Further, a diffusion plate that diffuses light is provided on the surface of the light guide plate. Then, the straight tube-shaped fluorescent lamp is arranged along the edge of the light guide plate. The light emitted from the fluorescent lamp is guided inside from the edge of the light guide plate, reflected by the light diffusion layer on the back surface, and diffused by the diffusion plate on the front surface. Further, the light traveling from the space between the light diffusion layers to the back surface side is reflected by the reflection plate and travels toward the front surface side.

In the direct type, a plurality of straight tubular fluorescent lamps are arranged in parallel in a housing, and a diffusing plate for diffusing light is provided so as to close the opening of the housing. In this case, a film (lighting curtain) having a dot pattern of aluminum vapor-deposited is arranged between the diffusion plate and the fluorescent lamp in order to make the emitted light uniform. The light emitted from the fluorescent lamp is reflected by the reflection plate provided on the inner surface of the housing and travels toward the diffusion plate. In this case, the light intensity is different between directly above the fluorescent lamp and above the side portion of the fluorescent lamp. Therefore, the lighting curtain is trying to control and equalize the amount of light passing therethrough.

[0005]

First, according to the conventional apparatus, the number of parts and the number of assembling steps are large, and the cost is increased. In addition, the film has elasticity due to temperature fluctuations, and the positional correspondence between the fluorescent lamp and the reflection pattern shifts,
It may impair the uniformity of light. Further, since the reflection pattern is formed by vapor deposition of aluminum or the like, peeling occurs or a large-scale device is required in the manufacturing process.

Further, according to the conventional backlight device, when the fluorescent lamp (cold cathode ray tube) is attached to the lamp fixing plate, a hole is formed in the lamp fixing plate and the work is inserted into the hole. Therefore, the assembling work is troublesome and the cost is high. Further, since the fluorescent lamp is a type having a lead wire, there is a problem that connection workability is poor and safety and reliability are poor. That is, in the case of the lead wire type, when connecting the power supply connection cable and the lead wire, the power supply connection cable and the lead wire are connected to each other by being twisted and soldered, or by using a caulking connector. For this reason, if the wires are soldered together, the workability will be poor, and the heat of the soldering will cause slow leaks.Because the cable cannot be completely fixed, mechanical stress is added to the root of the lead wire due to vibrations, etc. Since the soldered part, which causes disconnection, is not fixed stably, a step of covering the insulating tube is required. When crimping the crimp connector, mechanical stress may be applied to the root of the lead wire when crimping.
There are problems such as poor contact and easy workability.

[0007]

Therefore, according to the present invention, a backlight device which can simplify the structure of the entire device and can be made small and thin, has high durability and high reliability, and is also effective for improving the brightness. The purpose is to provide. To this end, a plurality of straight tubular fluorescent lamps are arranged in a thin, substantially rectangular dish-shaped housing, a reflective film is provided on the inner surface of the housing, and an acrylic resin is used to close the housing. In a backlight device having a light transmissive light diffusing plate disposed therein, a light diffusing layer is provided on the transparent acrylic plate, and a surface facing the fluorescent lamp is denser at a position closer to the fluorescent lamp and becomes coarser as it goes away. As described above, a diffusion layer having a reflectance of about 40 to 70% and a transmittance of about 55 to 25% by the light diffusion ink is provided.
In addition, the light-diffusing layer is made into an ink using a light-diffusing material as a transparent material, and has a light transmittance of 80 to 90% and a light diffusing property of
The amount used is 5 to 80%.

A further object of the present invention is to provide a backlight device which simplifies the component construction of the entire device and has good assembly workability, high durability, high reliability, and effective cost reduction. In order to achieve this object, a lamp whose both ends are base electrodes, a lamp fixing plate arranged at both ends of the lamp in a direction substantially orthogonal to the lamp axis, and a part of each of both sides of the lamp are provided. A bush having elasticity and a bush holding portion which is opened so as to be cut from one edge of the lamp fixing plate and to which the bush holding the lamp is attached, and a bush which is attached to a side surface of the lamp fixing plate. A clip socket for holding the base electrode is mounted, and a ballast capacitor connected to the lamp is mounted, and the clip socket is mounted when a bush holding the lamp is mounted on the bush holding portion. A printed circuit board provided to receive and hold the base electrode of the lamp.

[0009]

With the above-mentioned means, the function of the prior art can be achieved by one light diffusing plate, the number of assembling parts is small, and the working efficiency is improved. Further, since it is obtained by printing or coating with a light diffusing ink on a light diffusing plate, it is more resistant to temperature and functionally reliable than conventional films.

If the lamp and the bush are assembled by the above means and the bush is attached to the bush holding portion, the base electrode of the lamp is automatically connected to the clip socket of the printed board. Then, the lamp can be connected to the power source through the wiring of the printed circuit board and the ballast capacitor, the assembling work is easy, and the electrical connection is automatically obtained.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. Reference numeral 10 denotes a housing formed of an aluminum plate, which is a thin approximately square dish type. Specifically, FIG. 2 shows a plan view, a side view and a front view. The blades 11a and 11b are bent so as to stand at both ends in the long side direction, and the blades 12a and 12b are bent so as to stand at both ends in the short side direction. Wings 12
a and 12b stand up at an angle in an oblique direction. Lamp fixing plates 20a and 20b (20b is not shown) are arranged on both sides of the housing 10 in the longitudinal direction.

Both ends of the lamp fixing plate 20a are formed in a taper shape so as to match the preceding blade pieces 12a and 12b. The lamp fixing plate 20a is made of a highly reflective plastic (reflectance 98%). Further, notches or hole-shaped mounting portions a, b, c, d, e, f for fixing a plurality of lamps are formed on the edge side in contact with the bottom of the housing 10. In the embodiment, six fluorescent lamps 40a, 40b, 40c, 40d, 4 are used.
0e and 40f can be attached. Fluorescent lamps 40a, 40b, 40c, 40d, 40e, 40
A rubber cap is attached to an end portion of f, that is, a portion corresponding to the mounting portions a to f.

A reflector plate 50 is provided on the inner surface side of the housing 10.
(Thickness 0.2 mm, material RF188) is arranged. The fluorescent lamps 40a to 40f are arranged in parallel on the reflection plate 50. Although FIG. 1 shows the structure on one side, the other side is similarly configured. As shown in FIG. 2, in the portion where the lamp fixing plates 20a and 20b are arranged,
Screw holes X1 to X5 and Y1 to Y5 are formed, and correspondingly, lamp fixing plates 20a and 20b are also formed with holes for tightening screws.

FIG. 3 shows the lamp fixing plate 20a as a representative. The lamp fixing plate 20a has a fixing hole X1.
1 to X15 are provided, and holes X16 for attaching positioning pins are also formed at the left and right midpoints on the upper surface side. The same applies to the other lamp fixing plate 20b.

The above-mentioned reflector 50 and fluorescent lamps 40a-
When 40f and the lamp fixing plates 20a and 20b are assembled, the fluorescent lamp group has a housing with an open top. Therefore, the light diffusing plate 6 should be closed to close the opening of this housing.
0 is placed.

FIG. 4 shows still another embodiment of the lamp fixing plate. The same figure (A) is the same as that of FIG. 3, but the figure (B) and (C) is an example in which the hole-shaped mounting portions a, b, c, d, e, f are divided. The lamp can be pinched. Also, in the case of the same figure (B), a bush such as rubber is used to hold the lamp, and a U-shaped notch is formed in the lamp fixing plate, and the bush holding the lamp end is pushed into this. Has become. The structure shown in FIG. 6D is not a completely divided type, but has a hinge portion.
The same parts as those in FIG. 3 are designated by the same reference numerals.

FIG. 5 shows the light diffusion plate 60 in detail. The light diffusion plate 60 has a uniform light diffusion layer formed on one surface (for example, the upper surface) of a transparent acrylic plate. This light diffusion layer is formed by printing or coating and diffuses light uniformly.

Further, the position (area) where the fluorescent lamp exists immediately below is shown by hatching for convenience of the drawing. The circled part surrounded by the broken line is an enlarged view of a part of the shaded part. The light diffusion layer of the light diffusion plate 60 (when the light diffusion layer is provided on the lower surface) is printed or applied to
A dot pattern of a light control layer having a reflectance of about 40 to 70% by the light diffusion ink and a transmittance of about 55 to 25% is provided. As shown in the enlarged view, the dots are patterned so that the area becomes smaller as the distance from the position corresponding to the axis of the fluorescent lamp increases. The arrow A in the enlarged view is the portion located on the axis of the fluorescent lamp, and the area of the dots on this axis is the largest. According to this light diffusion ink, the reflectance is about 40 to 70% and the transmittance is about 55 to 25%.
The light loss is 2-5%. As a result, the light transmittance of the portion close to the light source is low, and the light transmittance is high as it is hung away from the light source, and uniform light is emitted as a whole plane.

Further, at the right and left center positions of the light diffusion plate 60,
Positioning holes XH and YH that engage with the positioning pins XP and YP attached to the lamp fixing plates 20a and 20b are formed. As a result, with reference to the fixing plates 20a and 20b for fixing the fluorescent lamp, the dot pattern portions DPa to DPf formed on the light diffusion plate 60 are attached with the fluorescent lamp based on the positioning pins, and the positioning analog is used. Since the dot pattern is printed on the basis of, it is possible to face the fluorescent lamp in correspondence with the position of the fluorescent lamp.

If the positional relationship between the fluorescent lamp and the dot pattern is not exactly in a predetermined relationship, the light will be diffused unevenly. However, since accurate positioning is possible with this device, the light is evenly diffused, that is, on the diffuser plate surface. It is possible to obtain uniform brightness. Further, since the positioning means is provided, accurate positioning can be easily performed even during assembly work.

The shape of the unit dot of the dot pattern in the present invention is arbitrary. Further, it may be a stripe type pattern. As the light diffusion ink, medium hollow glass bubbles are made into ink with a polymer resin binder and screen printed and applied to form a light transmissive light diffusion layer.Borosilicate glass medium cavity glass bubbles have high light transmission and medium cavity. There is a structure in which light is transmitted and refracted to have high diffusivity depending on the structure. Further, the organic fluorescent light-inducing luminescent material may be made into an ink with a polymer resin binder. Further, a transparent photocurable resin ink may be used. Further, transparent conductive ITO (indium oxide, tin oxide) dispersion type ink may be used. According to these, the light transmittance is 80 to 90.
%, A light diffusion layer having a light diffusion property of 55 to 80% can be obtained.

Further, FIG. 6 shows the principle of another structural example of the light diffusion plate 60. The light diffusing plate 60 has a transparent acrylic plate 601 on which a diffusing agent prepared by blending silica, zinc oxide, titanium, or a fluorescent substance is uniformly printed or applied to form a diffusion layer 602 (thickness: 0.5 μm to 100 μm)
m). Furthermore, on the upper surface of the diffusion layer 602,
The lens layer 603 is formed as a dot pattern. The lens layer 603 is made of a transparent resist or the same material as the diffusion layer. Further, the lens portion has a pattern in which the lens near the light source is small, and the lens becomes large as the distance from the light source 611 increases. By doing this, for example, as shown in the figure, the light energy of one light source is 100%, and as the distance increases, it becomes 8%.
Since the lens diameter is set so that the light collection rate increases as the distance increases from 0% to 50%, the adjacent light source 612
Since the utilization factor from the above is also set as described above, the condensing utilization factor of 100% is eventually obtained on the upper surface side. The lens part
Since it has a function of condensing the light, the utilization rate is extremely good, and the light condensed by the lens is now the diffusion layer 6
02, it will be diffused uniformly. The lens layer is
It may be a dot pattern, or may be a semi-cylindrical pattern along a fluorescent lamp.

In the above embodiment, the lens layer 603 is provided on the lower surface side (light source side) of the transparent acrylic plate 601, but the lens layer 603 is provided on the upper surface side (opposite to the light source side) as shown in FIG. Surface). In this case, the light source 61
The lens layer 603 having a convex lens shape in which the lens condensing effect becomes stronger as the distance from the position closer to 1 and 612 increases.
Becomes That is, in this embodiment, the light directivity of the lens is used, and even if the convex lens has a large thickness,
Utilizing the fact that the directivity is stronger than the thin one,
The one far from the light source has a strong directivity, and the one close to the light source has a small directivity to make the light uniform. In manufacturing, if the pattern is printed with a uniform amount of the lens ink, a thick lens and a thin lens are completed depending on the surface tension of the ink, the amount and the dot area.

Further, the present invention is based on a transparent acrylic plate 601.
The positional relationship among the light diffusion layer 602 and the lens layer 603 is shown in FIG.
Even if they are arranged as shown in (A) and (B), the effect is almost the same. That is, the lens layer 603 is sandwiched between the transparent acrylic plate 601 and the light diffusion layer 602. The same materials as those in the previous embodiment are designated by the same reference numerals.

As described above, according to the present invention, it is possible to provide a backlight device which simplifies the overall structure of the device and makes it small and thin, and which has good durability and high reliability and is effective for improving the brightness. Obtainable.

8 and 9 further show another embodiment of the present invention. FIG. 8 and FIG. 9 are divided exploded perspective views. The basic structure is the same as in the above embodiment.
That is, the plurality of fluorescent lamps 47a to 47 arranged in parallel.
The lamp fixing plates 20a and 20b are arranged in parallel to each other at both ends of f. In addition, the fluorescent lamps 40a-40
Reflecting plates 50 are arranged below the f at intervals. Although the entire housing 11 is not shown in the previous embodiment, the housing is specifically a rectangular aluminum chassis 151, and frames 111 and 121 arranged to face the long sides of the chassis 151, and a short frame. The frames 131 and 141 are arranged to face the sides. The frames 111, 121, 131, 141 have a U-shaped cross section when cut in the longitudinal direction, and are made of synthetic resin. Then, the lower surface side of the frame and the chassis 151 are integrated by screws. A diffusion plate 60 is arranged on the upper surface side of the frame. This constitutes a housing having an internal space.

This embodiment is characterized by the mounting structure of the lamp fixing plate and the fluorescent lamp and the power supply connecting structure of the fluorescent lamp. In the following, the partial structure of each part of FIGS. 8 and 9 will be separately taken and individually described.

FIG. 10A shows an example of a fluorescent lamp used in this embodiment and a structure for mounting this fluorescent lamp on a lamp fixing plate in principle. The fluorescent lamp includes a lead wire type fluorescent lamp 45 and a base type fluorescent lamp 47 sealed with a metal lid. In this embodiment, a mouthpiece type having a mouthpiece 471 is used in consideration of workability. When the lead wire type fluorescent lamp is attached to the lamp fixing plate, a rubber sleeve 46 must be attached to the contact portion in order to protect the tube, but the work is complicated. In this embodiment, the bush 70 is used.

The bush 70, which will be described as a representative one, is made of an elastic material, and its outer shape is, for example, U.
It has a character shape and has a hole 71 through which the lamp is inserted.
Lamp slot 7 cut into a V-shape from the curved part to 0
2 is formed. Therefore, the V-shaped lamp insertion port 72
The lamp can be easily fitted into the hole 70 by pressing around the lamp.

FIG. 10B shows in principle the mounting structure of the bush 70 and the lamp fixing plates 20a and 20b.
Although a large number of fluorescent lamps 47 and bushes 70 are used (see concrete perspective views of FIGS. 8 and 9), reference numerals 47 and 70 are used.
Is shown on behalf of. Further, one of the lamp fixing plates 20a will be described as a representative. The lamp fixing plate 20a is provided with a bush holding portion 75 that is opened so as to be cut into the lower edge and can be fitted with the bush 70. The bush holding portion 75 is opened in a U shape so as to match the shape of the bush. Therefore, if a bush is attached to each fluorescent lamp in advance and a bush is attached to the bush holding portion of the lamp fixing plate, a large number can be assembled simultaneously at the same time.

The bush 70 can be assembled with the fluorescent lamp 47 from the direction perpendicular to the tube axis, and has good workability.
The tube holding power is also excellent. If the method of inserting the sleeve is used, a force-consuming operation is required, and it takes time and damage is not small. In addition, there is a case where mechanical stress remains in the pipe, the lead wire and the portion where the lead wire is attached due to the forced pushing, but according to this embodiment, such a problem is solved.

Next, in this embodiment, the power supply connection of the lamp can be obtained simultaneously at the time of assembling. That is, the lamp fixing plate 20a side will be described as a representative. The lamp fixing plate 20a has a plurality of slits 201, 202, ...
Is provided. The protrusions 81 and 82 formed on the printed circuit board (relay substrate) 80a can be inserted into the slits 201, 202, ... To attach the printed circuit board 80a to the lamp fixing plate 20a. Although there are various mounting means without using the slit and the protruding piece, this has an advantage that the number of parts is small and the mounting work is simple. Slits 201, 20
The position of 2 is determined so that the printed circuit board 80a is located above the end of the fluorescent lamp, that is, the printed circuit board 80a is located on the cutout end side of the bush holding portion. Next, a ballast capacitor connected to each lamp is mounted on the printed circuit board 80a, and a clip socket 85 for elastically sandwiching the base 471 of each lamp for electrical connection is mounted. FIG. 10B shows a combination of the base 471 and the clip socket 85, but the other parts have the same relationship. The clip socket 85 acts like a fuse holding clip socket, and when the base 471 of the lamp 47 is pressed from below, the base 471 can be easily held.

According to this structure, first, the printed circuit board 80a is attached to the lamp fixing plate 20a, then the fluorescent lamp 47 and the bush 70 are integrated, and the bush 70 is attached to the bush holding portion 75. The base portion is also connected to the clip socket 85, so that the assembling work can be obtained with one touch as a whole.
The fluorescent lamps have printed wiring 86 for common connection to a power source after passing through corresponding ballast capacitors.
Electrically connect to. One end of the power supply lead wire 102 is soldered to the printed wiring 86 at the end of the printed circuit board 80a.

FIG. 11A shows the lamp fixing plate 20.
A, the printed circuit board 80a, the fluorescent lamp 47 and the like are assembled. FIG. 11B shows an example of a basic electric circuit of the fluorescent lamp 47 in this embodiment. Both terminals of the fluorescent lamp 47 are connected to the printed circuit board 80.
It is electrically connected by the clip sockets mounted on a and 80b. In this case, the ballast capacitors 89 are mounted on the printed circuit board 80a so as to correspond to the respective fluorescent lamps 47, but the printed circuit board 80b is provided with wiring for commonly connecting the electrodes of the respective fluorescent lamps 47. Good. When the plurality of fluorescent lamps are turned on, the ballast capacitors 89 are connected to each other in order to correct the imbalance of the electric characteristics of the respective tubes and ensure stable operation.

As described above, by mounting the ballast capacitor 89 on the printed circuit board 80a, the electrode processing work of the fluorescent lamp 47 can be simplified. In addition, it is possible to prevent components from being forgotten, soldering mistakes, and the like during assembly work. Further, it is sufficient to connect the two lead wires 101 and 102 connected to the common wiring of the printed circuit boards 80a and 80b to the first and second terminals of the power source 90, and the peripheral wiring becomes extremely simple. .

FIG. 11C shows the printed circuit board 8 described above.
It is the cross-sectional view which changed the direction of the 0a attachment part and the pipe attachment part, and was seen. One of the edges of the printed circuit board 80a is positioned by inserting the protruding piece into the slit of the lamp fixing plate 20a, while the other edge of the printed circuit board 80a is attached to the substrate holding portion 112 molded inside the frame 111. Engaged. The board holding portion 112 is formed so as to sandwich the upper and lower surfaces of the edge of the printed board 80a. The frame 111 is, for example, U-shaped when viewed in cross section from its longitudinal direction, and a diffusion plate can be attached to one piece and a housing (chassis) can be attached to the other piece (see FIG. 8 and FIG. 9).

According to the above-mentioned structure, the printed wiring of the printed circuit board 80a can be easily routed to the inner side of the main body (since the printed wiring is preliminarily formed), and the safety standard can be further secured. In other words, without using a printed circuit board,
If the lead wire is drawn around, the position of the lead wire may become unstable and the lead wire may be biased toward the frame side.
Then, a high pressure may cause a safety problem, but according to this embodiment, such a problem does not occur.

FIG. 12 is a view for explaining a reflector mounting structure which is a further characteristic part of this embodiment. That is,
In this embodiment, the reflection plate 50 is sandwiched and held by the lower edges of the lamp fixing plates 20a and 20b and the chassis 151. The reflection plate 50 is sandwiched between the bottom plate side of the chassis 151 and the bottom surfaces of the lamp fixing members 20a and 20b when, for example, screws are tightened. With such a configuration, it is possible to reduce the work process of fixing the reflection plate 50 alone and improve the assembly work efficiency.

FIG. 13A shows the apparatus of the above-mentioned embodiment in a sectional view. The reflector 50 is the chassis 1
It is fixed by being sandwiched by 51 and the lamp fixing plate 20a. Therefore, the mounting portions of the lamp fixing plate 20a and the reflecting plate 50 need only be partially tightened with screws or the like. Here, the chassis 151 described above has an electrical effect of increasing the brightness of the lamp and achieving stable operation. Figure 1
FIG. 3B is a diagram shown for explaining the electric effect of the chassis 151. The chassis 151 is connected to the midpoint potential (earth potential) of the line bypass capacitor of the power supply 90. The chassis 151 functions as an auxiliary electrode of the lamp, stabilizes the discharge state, and consequently increases the brightness. In this device, the chassis 151 is exposed on the back surface of the device, but it may be covered with an insulating frame.

[0040]

As described above, according to the present invention, the structure of the entire device can be simplified to make it compact and thin, and the backlight device has good durability and high reliability, and is also effective for improving the brightness. Can be obtained. Further, it is possible to obtain a backlight device which has a small number of parts, has good workability in assembling, and can reduce cost.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing the housing of FIG. 1 taken out.

FIG. 3 is an explanatory view showing the lamp fixing plate of FIG. 1 taken out.

FIG. 4 is an explanatory view showing various examples of a lamp fixing plate.

FIG. 5 is an explanatory view showing the light diffusion plate of FIG. 1 taken out.

FIG. 6 is a diagram shown for explaining a structural example of a light diffusion plate.

FIG. 7 is a diagram further shown for explaining a structural example of a light diffusion plate.

FIG. 8 is a diagram showing a part of an exploded perspective view of another embodiment of the present invention.

FIG. 9 is a diagram showing a part of an exploded perspective view of another embodiment of the present invention.

FIG. 10 is a view showing a part of the component connecting structure of FIGS. 8 and 9;

FIG. 11 is a view showing a part of the component coupling structure of FIGS. 8 and 9 similarly.

FIG. 12 is a view similarly showing a part of the component coupling structure of FIGS. 8 and 9;

FIG. 13 is an explanatory diagram of a part of the component coupling structure and the electric circuit of FIGS. 8 and 9;

[Explanation of symbols]

10 ... Housing, 20a, 20b ... Lamp fixing plate, 4
0a-40f, 47a-47f, 47 ... Fluorescent lamp, 5
0 ... Reflector, 60 ... Light diffuser, 71 ... Bush, 80
a, 80b ... printed circuit board, 85 ... clip socket,
86 ... Printed wiring, 89 ... Ballast capacitor, 90 ... Power supply, 101, 102 ... Lead wire, 201, 202 ... Slit, 151 ... Chassis.

Claims (16)

[Claims] 1. A plurality of straight tubular fluorescent lamps are arranged in a thin, substantially rectangular dish-shaped housing, and a reflective film is provided on the inner surface of the housing, and an acrylic light-transmitting material is used to close the housing. In a backlight device in which a fluorescent light diffusing plate is arranged, a lamp fixing plate having engaging holes capable of engaging the ends of the respective fluorescent lamps is arranged at both ends of the fluorescent lamp group. Is fixed to the housing with hooks and screws, and the upper end surface of the lamp fixing plate is engaged with the hole of the light diffusing plate to position the light diffusing plate and the fluorescent lamp. The backlight device is characterized in that a protruding pin (reference point) is provided. 2. A plurality of straight tubular fluorescent lamps are arranged in a thin, substantially rectangular dish-shaped housing, and a reflective film is provided on the inner surface of the housing, and an acrylic light-transmitting material is used to close the housing. In a backlight device in which a light-diffusing plate is arranged, a light-diffusing layer is applied to or printed on the transparent acrylic plate, and on a surface facing the fluorescent lamp, positions closer to the fluorescent lamp become larger and denser Print or apply light-diffusing ink in a pattern that is small and rough, and has a reflectance of about 40-70% and a transmittance of about 55-25%.
A backlight device characterized by being used as a diffusion layer of. 3. The light-diffusing ink is an ink made by using a light-diffusing material as a transparent material, and has a light transmittance of 80.
The backlight device according to claim 2, wherein the backlight device has a light diffusion property of 90% to 55% and a light diffusion property of 55% to 80%. 4. A plurality of straight tubular fluorescent lamps are arranged in a thin rectangular dish type housing, and a reflective film is provided on the inner surface of the housing, and an acrylic light transmitting material is provided to close the housing. In a backlight device in which a transparent light diffusing plate is arranged, on a surface of the transparent acrylic plate facing the fluorescent lamp,
A backlight characterized in that a light diffusing layer is applied or printed, and a convex lens-shaped lens pattern layer is formed on a surface close to the fluorescent lamp so that the lens condensing effect becomes weaker as the distance from the position closer to the light source increases. apparatus. 5. A plurality of straight-tube fluorescent lamps are arranged in a thin, substantially rectangular dish type housing, and a reflective film is provided on the inner surface of the housing, and an acrylic light transmitting material is provided to close the housing. In a backlight device in which a transparent light diffusion plate is arranged, a surface opposite to the surface of the transparent acrylic plate facing the fluorescent lamp is coated or printed with a light diffusion layer, and a surface close to the fluorescent lamp is a light source. A backlight device, wherein a lens pattern layer having a convex lens shape is formed so that the lens condensing effect becomes stronger as the distance from the near position increases. 6. A plurality of straight tubular fluorescent lamps are arranged in a thin, substantially rectangular dish-shaped housing, and a reflective film is provided on the inner surface of the housing, and an acrylic light-transmitting material is used to close the housing. In a backlight device in which a light-diffusing plate is disposed, a convex lens whose lens condensing effect becomes stronger on a surface of the transparent acrylic plate facing the fluorescent lamp or an opposite surface thereof as the distance from the position closer to the light source increases. A back light device, comprising: forming a lens pattern layer having a circular shape, and coating or printing a light diffusion layer on an upper surface of the lens pattern layer. 7. The structure in which the engaging hole of the lamp fixing plate is formed by a U-shaped notch, and a bush made of an elastic material such as rubber holding the end of the fluorescent lamp is attached to the notch. The backlight device according to claim 1, which is characterized in that. 8. A lamp having both ends having base electrodes, a lamp fixing plate disposed at both ends of the lamp in a direction substantially orthogonal to the lamp axis, and an elastic member holding a part of each side of the lamp. A bush holding part, which is opened so as to cut from one edge of the lamp fixing plate, and to which a bush holding the lamp is attached, and a bushing holding part which is attached to a side surface of the lamp fixing plate and which has the base of the lamp. A clip socket that holds an electrode is mounted, and a ballast capacitor that is connected to the lamp is mounted, and the clip socket is configured such that when the bush holding the lamp is attached to the bush holding portion, the lamp And a printed circuit board provided so as to receive and hold the base electrode of the backlight device. . 9. The printed circuit board according to claim 8, wherein the printed circuit board has a protruding piece at an edge thereof, and the protruding piece is attached by being inserted into a slit formed in the lamp fixing plate. Backlight device. 10. The lamp includes a plurality of lamps, and the printed board provided on one side of the lamp has the clip sockets corresponding to the respective lamps, and each clip socket has a common clip socket provided on the board. 9. The backlight device according to claim 8, wherein the backlight device is connected to a wiring, and a lead wire for connecting a power source is soldered to the wiring. 11. The bush holding portion is U-shaped,
The bush has a configuration such that its outer shape matches the U-shape, and has a hole through which the lamp is inserted, and a lamp mounting opening cut into a V-shape from a curved portion is continuous to this hole. 9. The backlight device according to claim 8, wherein. 12. The backlight device according to claim 8, wherein the reflector arranged below the lamp is sandwiched and held by the lower surface of the lamp fixing plate and the chassis. 13. One output terminal of the inverter power supply is connected to one electrode of the cold cathode ray tube, and the other output terminal of the inverter power supply is connected to the other electrode of the cold cathode ray tube via a ballast capacitor. In the backlight device, an auxiliary electrode connected to the ground potential of the inverter power supply is arranged along the cold cathode ray tube. 14. A plurality of fluorescent lamps arranged in parallel, a lamp fixing plate arranged at both ends of the fluorescent lamp in a direction substantially orthogonal to the tube axis, and one of the both sides of the fluorescent lamp. Lamp holding means for holding a portion to the lamp fixing plate, a flat plate-shaped reflector plate arranged at intervals in the plurality of fluorescent lamps, arranged so as to be juxtaposed with the reflector plate, A backlight device comprising: a flat auxiliary electrode plate to which a ground potential of a power source is applied. 15. The backlight device according to claim 14, wherein the auxiliary electrode plate forms a bottom of the housing. 16. A step of preparing a plurality of lamps each having a base electrode at both ends, and a step of disposing first and second lamp fixing plates at both ends of the lamp in a direction substantially orthogonal to a lamp axis, respectively. A step of holding a part of each of both sides of the lamp with a bush having elasticity; and a printed board on which a clip socket for holding the base electrode of the lamp is mounted and a ballast capacitor connected to the lamp is mounted. The step of attaching to the side surface of the lamp fixing plate, and the bush holding portion opened so as to cut from one edge of the lamp fixing plate, at the same time as mounting the bush holding the lamp, to the clip socket, And a step of mounting a base electrode of a lamp.