JPH1012026A - Backlight - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce the soldered portion of a feedback wire, and enhance the reliability of soldering by providing an island-like solder land portion for heat shutoff on a light source reflector, and coating the solder land portion and the soldered portion of the wire by insulation. SOLUTION: In a soldered portion of a feedback wire 5 and a light source reflector 2, the reflector 2 uses solderable brass, and an island-like solder land 8 is formed on an end portion for heat shutoff. By providing the land 8, the heat diffusion of a soldering iron is limited in a small part, and the soldering iron is hardly deprived of heat so that the wire 5 is easily soldered with the reflector 2. By coating the land 8 and the soldering portion by tubular insulation 9, external force is hardly applied so that the soldered portion is reinforced and reliability is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight used for a liquid crystal display or the like.

[0002]

2. Description of the Related Art FIG. 1 shows a basic structure of a conventional backlight.
FIG. 2 is a partially enlarged view of FIG. In FIG. 1, a discharge tube 1 serving as a light source is arranged on at least one side of an acrylic transparent light guide 3 having a light diffusion layer 6 on a front surface and a light reflection layer 7 on a back surface. The backlight has a structure in which a U-shaped light source reflector 2 made of metal such as brass coated with a light reflector is used.

A high-voltage wire 4 for supplying a high voltage generated by a light source lighting inverter circuit is connected to one end of the discharge tube 1, and the other end of the discharge tube 1 is directly soldered to the light source reflector 2. The light source reflector 2 itself is used as a power supply current return path, and the return wire 5 is soldered to the light source reflector 2 and connected to the ground of the inverter circuit.

[0004]

In the conventional backlight, when soldering the return wire to the light source reflector, the heat of the soldering iron is easily diffused to the light source reflector and the temperature required for the soldering does not easily rise. In addition, there is a problem that the soldered portion is directly received from the outside, so that the soldered portion is detached or the return wire is cut off from the soldered portion.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an island-shaped solder land for heat insulation on a light source reflector, and uses the solder land as a support base and a soldering portion such as a tube. Backlight structure covered with an insulator.

[0006]

By introducing the backlight structure according to the present invention, the soldering portion of the return wire can be strengthened, and the reliability of the soldering can be improved.

[0007]

Embodiment 1 The present invention will be specifically described below with reference to the drawings. Parts having the same functions as those of the conventional backlight shown in FIGS. 1 and 2 are denoted by the same reference numerals.

FIG. 3 shows an embodiment of the present invention relating to a soldering portion between the return wire 5 and the light source reflector 2.

The light source reflector 2 uses brass which can be soldered similarly to a conventional backlight, but has an island-shaped solder land 8 at the end for heat insulation.

By providing the solder land 8, the heat spread of the soldering iron is reduced to only a small portion, the heat of the soldering iron is not easily taken away, and the return wire 5 can be easily soldered to the light source reflector 2. became.

[0011]

Embodiment 2 FIG. 4 shows an embodiment of the present invention relating to a soldering portion between the return wire 5 and the light source reflector 2. By covering the solder land and the tube-shaped insulator 9 with the solder land 8 as a support base, the solder land 8 is less susceptible to external force.

[0012]

As described above, according to the present invention, the soldering of the return wire is facilitated by forming the solder land of the return wire on the light source reflector, and the return wire is covered with an insulator. A backlight having a strengthened soldering portion and improved reliability was obtained.

[Brief description of the drawings]

FIG. 1 is a basic structural diagram of a conventional backlight.

FIG. 2 is a partially enlarged view of a basic structure diagram of a conventional backlight.

FIG. 3 is a structural diagram of a backlight showing one embodiment of the present invention, particularly a structural diagram relating to a solder land portion of a light source reflector.

FIG. 4 is a structural diagram of a backlight showing one embodiment of the present invention, particularly a structural diagram in which an insulator is applied to a soldering portion of a light source reflector and a return wire. 1 to 4 indicate the following items, respectively.

[Explanation of symbols]

 1: Discharge tube 2: Light source reflector 3: Transparent light guide 4: High voltage wire 5: Return wire 6: Light diffusion layer 7: Light reflection layer 8: Solder land 9: Insulator

Claims (2)

[Claims] At least one discharge tube serving as a light source is disposed at at least one side end of a transparent light guide, and the light source is formed into a backlight such that the light source is covered with a light source reflector whose inner surface is covered with a reflector. Wherein the light source reflector is provided with island-shaped solder lands for heat insulation. 2. The backlight according to claim 1, wherein
A backlight, wherein the solder land portion of the light source reflector and the soldered portion of the electric wire are coated with an insulator.