JPH09115322A - Light panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of part items of a reflector, facilitate the insertion arrangement thereof, and provide a light panel with its high efficiency of light utilization. SOLUTION: This light panel is provided with a light source 6 mounted on a printed circuit board 5 and a light leading plate 4 in which the light of the light source 6 is incident from a one-end face, propagates the inside of wall thickness, and is emitted to the outside from a light irradiation face 8. A reflector arranged at the back of the light source 6 and a reflector arranged on the full side faces excluding the light irradiation face 8 of the light leading plate 4 are formed by means of an integrated reflecting sheet 20, a reflecting sheet 20 is bent appropriately, and a space constituted by the light source 6 and the light leading plate 4 is constituted by enclosing a almost full area excluding the said light irradiation face 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light panel in which a display member such as a photographic film is placed on a light irradiation surface and light is emitted from the back of the display member.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view showing a schematic internal structure of an example of a light panel of this type. As shown in FIG. 6, the light panel accommodates a printed board 5 on which a light source composed of an elongated cold-cathode fluorescent discharge tube 6 is mounted in a housing 1 and a thick light-guide plate 4 in a flat shape. The photodischarge tube 6 is arranged to face the peripheral side surface 7 formed by the thickness of the light guide plate 4.

The light formed by the cold cathode fluorescent discharge tube 6 enters the light guide plate 4 from the peripheral side surface 7 of the light guide plate 4, propagates in the light guide plate 4, and is guided to the opening side of the housing 1. Surface of light plate 4,
That is, it is emitted from the light irradiation surface 8 to the outside. Then, the opening of the housing 1 is covered with a cover 2 having an opening 3 through which the light irradiation surface 8 of the light guide plate 4 is viewed, and is assembled as shown in FIG.

By the way, in order to improve the light irradiation efficiency of the light panel, a reflector is provided around the light guide plate 4 and in the cold cathode fluorescent discharge tube 6. FIG. 7 is a perspective view of a conventional structure of such a reflector, and 10 is inserted on the side opposite to the light irradiation surface 8 of the light guide plate 4, that is, between the bottom surface of the housing 1 and the light guide plate 4. A reflector, 11 is a reflector inserted between the light guide plate 4 and the inner side wall of the housing 1, and 12 is a cold cathode fluorescent discharge tube 6
Is a reflector that is inserted to the rear of the housing, the bottom surface of the housing 1, the inner side surface of the housing 1, and the cold cathode fluorescent discharge tube 6 when the light panel is assembled.

[0005]

However, the bottom surface of the housing 1, the inner side surface of the housing 1, and the reflectors inserted at the respective positions of the cold cathode fluorescent discharge tube 6 are formed separately from each other. Since the number of points is large and it takes a lot of time and effort to dispose without gaps, further, a discontinuous portion of the reflector, for example, both end portions of the cold cathode fluorescent discharge tube 6 or the reflector 12 and the reflector 10 is required.
Light is leaked to the space between and, and the utilization efficiency of the spectrum is low.

The present invention has been made in view of the above, and an object of the present invention is to provide a light panel in which the number of parts of the reflector is reduced, the insertion and arrangement thereof are facilitated, and the light utilization efficiency is high.

[0007]

The above object of the present invention is to provide a light guide plate having a light irradiation surface, a light source arranged to face a peripheral side surface of the light guide plate, a light irradiation surface of the light guide plate, and the light irradiation surface. 1. A light panel comprising: a light guide plate reflector disposed so as to face a surface other than a peripheral side face opposite to a light source; and a light source reflector for reflecting light of the light source toward the peripheral side face of the light guide plate. This is achieved by providing a light panel characterized in that the light guide plate reflector and the light source reflector are integrally formed in a sheet shape.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the opposite surface of the light guide plate facing the light irradiation surface, the three side surfaces of the peripheral edge, and the reflector arranged on the light source are appropriately formed on a single sheet of polyester, for example. Form notches, notches, and creases to form a series of integrated reflection sheets, which are bent and bent along the creases when assembling the light panel, and are inserted and placed at locations corresponding to the light guide plate and light source values. .

As described above, when the opposite surface facing the light irradiation surface of the light guide plate, the side surfaces on the three sides, and the reflectors arranged on the light source are formed on a series of integral reflection sheets, the light irradiation surface of the light guide plate is formed. It becomes easy to cover the entire circumference of the light guide plate and the light source except for the reflective sheet, and by covering the entire circumference with the reflective sheet, the leakage of light from the discontinuous portion of the reflector is reduced, The light utilization efficiency is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a schematic exploded perspective view of a light panel of an embodiment of the present invention, FIG. 2 is a sectional view of the light panel of the embodiment shown in FIG. 1, FIG. 3 is a perspective view of the light panel of the embodiment shown in FIG. FIG. 4 is a development view of the reflection sheet of the light panel of the embodiment of FIG. 1, and FIG. 5 is a development view of the reflection sheet of the light panel of another embodiment. The overall structure of the light panel excluding the reflector is the same as that described with reference to FIG. 6, and corresponding parts are designated by the same reference numerals.

In FIGS. 1 and 2, 1 is a housing, 2 is a cover, 4 is a thick light guide plate made of acrylic resin or the like having a thick wall, and 5 is a lighting circuit including a high frequency high voltage power source. The printed circuit board 6 is a light source electrically and mechanically connected to the printed circuit board 5 via leads 9. In this embodiment, a cold cathode fluorescent discharge tube having a diameter of about 3 mm and a length of about 97 mm is used. There is. The printed circuit board 5 on which the light guide plate 4 and the light source, that is, the cold cathode fluorescent discharge tube 6 are mounted is shown in FIG.
It is housed inside the housing 1 in the same manner as described with reference to FIG.

Reference numeral 20 is a light guide plate 4 and a cold cathode fluorescent discharge tube 6.
The reflection sheet applied to the sheet is formed by cutting out a sheet of polyester, for example, into an outer shape as shown in FIG. That is, the light irradiation surface 8 of the light guide plate 4
The surface of the light guide plate 4 facing the opposite side, the surfaces 22, 23, and 24 of the cold cathode fluorescent discharge tube 6 which are applied to the three side surfaces of the light guide plate to the peripheral side surface 7 of the light guide plate 4. A surface 25 arranged at a position for reflecting toward the cold cathode fluorescent discharge tube 6 side is integrally formed, and is provided between the surfaces 22, 23, 24 applied to the three peripheral side surfaces and the light guide plate 4 respectively. A surface 21 applied to the surface opposite to the light irradiation surface 8 and a surface 25 arranged on the cold cathode fluorescent discharge tube 6 side.
A notch 28 is formed at a boundary portion between and to facilitate bending.

Further, in the reflection sheet 20, the surface 25 arranged on the cold cathode fluorescent discharge tube 6 side is formed wider than the length of the cold cathode fluorescent discharge tube 6, and therefore, at the time of assembly, A hole 26 for inserting the lead 9 for supporting and connecting the cold cathode fluorescent discharge tube 6 to the printed circuit board 5 and a notch 27 for guiding the lead 9 to the hole 26 are formed.

Further, on the reflection sheet 20, as shown by a dotted line in FIG. 4, a surface 21 applied to a surface opposite to the light irradiation surface 8 of the light guide plate 4 and three peripheral side surfaces of the light guide plate 4. The boundary of each of the surfaces 22, 23, 24 applied to
The lead 9 extends from the hole 26 through which the lead 9 of the surface 25 arranged on the cold cathode fluorescent discharge tube 6 side extends to the tip of the surface 25.
A crease line is formed by a line or a groove or a perforated line or the like which guides the fold at a fold between the width and the boundary exceeding the width and the cold-cathode fluorescent discharge tube 6 to a predetermined curvature. ing.

When assembling a light panel using the reflection sheet 20 thus formed, as shown in FIG. 1, the surface 21 which is applied to the surface opposite to the light irradiation surface 8 of the light guide plate 4 and the three sides. Faces 22, 2 applied to the peripheral side faces of the
3 and 24 are bent along the crease lines at the boundaries, and in the state shown in FIG. 1, the surface 26 of the surface 25 arranged on the cold cathode fluorescent discharge tube 6 side is opened from the hole 26 through which the lead 9 is inserted. Bending along the width between the leads 9 across the tip and the crease line at the boundary exceeding the width, and inserting it from the tip of the surface 25 by submerging it between the cold cathode fluorescent discharge tube 6 and the printed circuit board 5. , The lead 9 is positioned in the hole 26, and the fold is opened to restore the original state.

Next, the surface 25 arranged on the cold cathode fluorescent discharge tube 6 side is bent along the cold cathode fluorescent discharge tube 6 into a predetermined curvature, and the light of the cold cathode fluorescent discharge tube 6 is guided by the light guide plate 4. A reflecting portion that reflects the light toward the peripheral side surface 7 is formed. The printed circuit board 5 is fixed in advance at a predetermined position inside the housing 1, and the work of inserting and arranging the reflection sheet 20 is performed while inserting the reflecting sheet 20 into the housing 1. Then, the light guide plate 4 is housed in the housing 1, and an opening 3 (which may be covered with a light transmissive body such as glass) that looks into the light irradiation surface 8 of the light guide plate 4 is provided in the opening of the housing 1. The formed cover 2 is covered to complete the assembly.

FIG. 2 is a sectional view of the light panel after the assembly is completed. The tip of the surface 25 of the reflection sheet 20 arranged on the cold cathode fluorescent discharge tube 6 side is sandwiched between the light guide plate 4 and the cover 2. It is fixed. The reflection sheet 20 may be fixed in place by using a double-sided adhesive tape or the like.

In the reflection sheet 20 shown in FIG. 4, the surface 25 arranged on the cold cathode fluorescent discharge tube 6 side is formed wider than the length of the cold cathode fluorescent discharge tube 6, and the surface of the light guide plate 4 is formed. The entire circumference of the light guide plate 4 and the cold cathode fluorescent discharge tube 6 except the light irradiation surface is covered with a reflection sheet, so that the light from the discontinuous portion of the reflector, especially the both end portions of the cold cathode fluorescent discharge tube 6 is reflected. The loss due to leakage is almost eliminated, and the light utilization efficiency is greatly improved.

However, when the cold sheet fluorescent discharge tube 6 and the printed circuit board 5 are inserted while penetrating from the tip of the surface 25 of the reflection sheet 20 arranged on the cold cathode fluorescent discharge tube 6 side, the surface 2 is inserted.
In order to match both widthwise ends of 5 with the width between the leads 9, it is necessary to bend the ends once and then open the bend again to return to the original state, which is a little laborious. The embodiment shown in FIG. 5 shows a reflection sheet 30 that can save the trouble.

The reflection sheet 30 shown in FIG. 5 differs from the reflection sheet 20 shown in FIG. 4 in that the reflection sheet 2 shown in FIG.
Formed on the cold cathode fluorescent discharge tube 6 side from the hole 26 through which the lead 9 is inserted to the tip of the surface 25 at the width between the leads 9 and the boundary portion exceeding the width. The point cut off according to the formed crease lines, that is, the reflection sheet 30 shown in FIG. 5, is the area between the leads 9 from the position where the leads 9 of the surface 35 arranged on the cold cathode fluorescent discharge tube 6 side are located to the tip. It is a point formed in the width of.

When the reflection sheet 30 is formed in this manner, the loss due to the leakage of light from both ends of the cold cathode fluorescent discharge tube 6 is slightly larger than that of the reflection sheet 20 shown in FIG. Less panel assembly effort. The configuration of the reflection sheet 30 located on the light guide plate 4 side is the same as that of the reflection sheet 20 shown in FIG. 4, the same reference numerals are given, and detailed description thereof is omitted.

Although the cold cathode fluorescent discharge tube is used as the light source in the embodiment, the light source is not limited to the cold cathode fluorescent discharge tube, and another discharge tube may be used. Further, the shape of the light panel is not limited to the one shown in the drawing, but can be changed to various shapes.

[0023]

As described above, according to the present invention, the opposite surface of the light guide plate opposite to the light irradiation surface, the three peripheral side surfaces, and the reflectors arranged on the light source are formed by a series of integrated reflection sheets. Therefore, the number of parts of the reflector is reduced,
Since there is little labor for inserting and arranging it, and because the space formed by the light source and the light guide plate is appropriately bent to surround the entire area except the light irradiation surface, the light from the discontinuous portion of the reflector Loss is reduced, and the light utilization efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a schematic exploded perspective view of a light panel according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the light panel shown in FIG.

FIG. 3 is a perspective view of the light panel shown in FIG.

FIG. 4 is a development view of a reflection sheet of the light panel according to the embodiment of the invention.

FIG. 5 is a development view of a reflection sheet of a light panel according to another embodiment of the present invention.

FIG. 6 is a perspective view showing a schematic internal structure of a light panel.

FIG. 7 is a perspective view showing a configuration of a reflector of a conventional light panel.

[Explanation of symbols]

1 Case 2 Cover 4 Light Guide Plate 5 Printed Circuit Board 6 Light Source (Cold Cathode Fluorescent Discharge Tube) 7 Peripheral Side 8 Light Irradiation Surface 9 Leads 20, 30 Reflective Sheets 21, 22, 23, 24 Applied to the Surface of Light Guide Plate Reflective surface 25, 35 Reflective surface arranged on the light source side 26 Lead insertion hole

Claims (1)

[Claims] 1. A light guide plate having a light irradiation surface, a light source arranged to face a peripheral side surface of the light guide plate, and a surface excluding a light irradiation surface of the light guide plate and a peripheral side surface opposite to the light source. A light panel having a light guide plate reflector disposed in a light guide plate, and a light source reflector for reflecting light of a light source toward a peripheral side surface of the light guide plate, wherein the light guide plate reflector and the light source A light panel comprising a reflector and a sheet integrally formed.