JP3065620U - Discharge lamp device - Google Patents

Abstract

(57) [Problem] To increase the effective emission length of the discharge lamp 1 by shortening the length of the bent portion of the rubber holder 4 into which the discharge lamp 1 is inserted. [MEANS FOR SOLVING PROBLEMS] A discharge lamp 1 is provided at an outer end of an internal electrode 2 which is sealed in a discharge lamp 1 having a phosphor film coated on its inner surface.
The introduction line 3 is electrically connected at a substantially right angle to the valve axis, and the introduction line 3 is airtightly penetrated through the valve wall and led out to the outside. It is connected. The end of the discharge lamp 1, the introduction wire 3, and the inner end of the power supply lead wire 5 are provided so that the outer end of the discharge lamp 1 is located inside the bent portion of the L-shaped rubber holder 4.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a discharge lamp device constituting a backlight unit of a transmissive liquid crystal display device such as a liquid crystal monitor, and more particularly to a discharge lamp device having a longer effective light emission length and improved light quantity.

[0002]

[Prior art]

 A conventional backlight unit composed of a light guide plate forming a light emitting surface and a discharge lamp device as a light emitting source will be described with reference to FIG.

In FIG. 5, an internal electrode 2 is sealed in the vicinity of a sealing portion at both ends of a discharge lamp 1 having a thin wall thickness of about 0.5 mm and an outer diameter of about 3 mm. The lead-in wire 3 connected to the connector is hermetically penetrated from the sealing portion and is led out. The outer end of the introduction wire 3 is connected to the inner end of a power supply lead wire (harness) 5 by soldering 6. The rubber holder 4 is formed in a hollow L-shape, and the rubber holder 4 houses both ends of the discharge lamp 1 and the inner end of the power supply lead wire (harness) 5 together with the introduction wire 3.

As in FIG. 2, the backlight unit is configured by disposing the discharge lamp device at a lower portion in a bottomed case 7.

[0005]

[Problems to be solved by the invention]

 By the way, in the conventional discharge lamp device, the power supply lead wire is connected by soldering at the outer end of the sealed portion of the discharge lamp, so that the end of the discharge lamp in the L-shaped holder is fitted. The axial length of the part to be inserted becomes longer by the thickness of the soldering. Therefore, when the discharge lamp device is disposed in a bottomed case of a predetermined size, the effective emission length of the discharge lamp becomes shorter. there were.

Accordingly, in order to eliminate the disadvantages of the conventional example, the present invention reduces the axial length of the discharge lamp fitting portion of the L-shaped holder by the thickness of soldering, and reduces the length by the shortened length. It is an object of the present invention to increase the effective light emission length of a discharge lamp to increase the amount of light.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the invention according to claim 1 of the present invention is a discharge lamp device arranged in a bottomed case such that a discharge lamp and a power supply lead wire are in a substantially parallel positional relationship. In addition, the discharge lamp electrically connects an introduction wire to an internal electrode sealed near both ends of a glass valve having a phosphor film coated on an inner surface thereof at a substantially right angle with respect to the bulb axis of the glass bulb. The lead-in wire is hermetically penetrated through the glass bulb wall and led out to the outside. The outer end of the lead-in wire is electrically connected to the power supply lead wire, and both ends of the glass bulb and the power supply lead are connected. The inner end of the lead wire is centered on the lead-in line led out of the glass bulb, and the outer wall of the end of the glass bulb is on the inner wall surface of the holder facing the glass bulb insertion opening of the holder having the bent portion. Inside as close It is characterized by comprising been configured.

Further, as in the invention of claim 2, the wall thickness of the bulb wall of the glass bulb is 0.1 mm. It is preferred that it is 3 to 1.0 mm.

It is also conceivable that the connecting portion between the introduction wire and the internal electrode is formed flat as in the invention according to claim 3.

[0010]

[Embodiment of the invention]

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory view showing a main part of an embodiment of the present invention, and FIG. 2 is an explanatory view showing a state in which a discharge lamp device is provided in a bottomed case. In these figures, the discharge lamp 1 has a thin wall having a thickness of 0.3 to 1.0 mm and an outer diameter of about 3.0 mm, and has a phosphor film forming portion on the inner wall surface of a small diameter glass. 2 is sealed. An introduction wire 3 made of a dumet wire penetrates the peripheral wall of the end of the discharge lamp 1 in an airtight manner and is led out. The lead-in wire 3 extends from the peripheral wall of the end of the discharge lamp 1 at an angle of about 90 ° with respect to the valve axis of the discharge lamp 1. And the power supply lead wire 5 by soldering 6. As a specific example, assuming that the distance from the inner end of the internal electrode 2 to the outer wall surface of the rubber holder opposing the glass valve insertion opening of the rubber holder 4 is 5 mm, the power supply lead wire insertion of the rubber holder 4 is performed. It is preferable that the distance from the opening to the outer wall surface of the rubber holder 4 is about 7 mm.

The discharge lamp device shown in this embodiment is mounted below a light guide plate 8 in a bottomed case 7 as shown in the figure, and receives a current flowing from a power supply (not shown) provided outside. The discharge lamp 1 is turned on by flowing the power to the power supply lead wire 5 through the connector 9. The discharge lamp device shown in this embodiment has a long effective light emission length (about 2 mm 2) corresponding to the thickness of soldering, can increase the amount of light, and can achieve higher brightness and smaller size of the liquid crystal display device.

In the embodiment shown in FIGS. 3 and 4, the inner end of the lead wire 3 is formed flat. When flattened, the light emission length becomes even longer. Other configurations are the same as those of the embodiment shown in FIGS. 1 and 2 described above.

[0014]

[Effect of the invention]

 In the present invention, since the lead wire is connected to the outer end of the internal electrode at an angle of about 90 ° with respect to the bulb axis, the length of the glass bulb insertion side of the holder is shortened, and the effective light emission length is reduced. And the liquid crystal display device can be made higher in brightness and smaller in size.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a main part of one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state where a discharge lamp device is provided in a bottomed case.

FIG. 3 is an explanatory view showing a main part of another embodiment of the present invention.

FIG. 4 is an explanatory diagram showing introduction lines.

FIG. 5 is an explanatory view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Discharge lamp 2 Electrode 3 Lead wire 4 Rubber holder 5 Power supply lead wire 6 Soldering 7 Bottom case

Claims (3)

[Utility model registration claims] 1. A discharge lamp device disposed in a bottomed case such that a discharge lamp and a power supply lead wire are in a substantially parallel positional relationship, wherein the discharge lamp has a phosphor film coated on an inner surface thereof. To the internal electrodes sealed near both ends of the glass bulb, electrically connected to the introduction line at a substantially right angle to the bulb axis of the glass bulb, and electrically connected the introduction line, The lead-in wire passes through the glass bulb wall in an airtight manner and is led out.The outer end of the lead-in wire is electrically connected to the power supply lead wire, and both ends of the glass bulb and the power supply lead wire inner end are connected. The part is centered on the introduction line extending from the glass bulb, and the end outer wall of the glass bulb is installed so as to be close to the inner wall surface of the holder facing the glass bulb insertion opening of the holder having the bent portion. Be configured A discharge lamp device. 2. The thickness of the bulb wall of the glass bulb is:
The discharge lamp device according to claim 1, wherein the discharge lamp device has a diameter of 0.3 to 1.0 mm. 3. The discharge lamp device according to claim 1, wherein a connecting portion of the introduction wire with the internal electrode is formed flat.