JPH0724210B2 - Discharge lamp device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp device, and more particularly to a discharge lamp device provided with a glass tube for shielding ultraviolet rays surrounding a discharge lamp.

[Prior art]

In the recent automobile lamp industry, attention has been paid to a discharge lamp which has good luminous efficiency and color rendering properties and has a long life.
However, the light emitted from this type of lamp contains ultraviolet rays which are harmful to the human body, and therefore, when it is irradiated for a long time, a phenomenon similar to sunburn occurs, which is unfavorable for health. Therefore, as shown in FIG. 3, there has been proposed a technique of cutting ultraviolet rays from the light emission of the discharge lamp. This is a technique disclosed in Japanese Patent Application Laid-Open No. 60-138845, and is a lamp device having a structure in which an ultraviolet shielding member 4 for cutting ultraviolet rays is provided around the discharge lamp 2.

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional technique, it is necessary to provide a shielding member stay 7 for supporting the ultraviolet shielding member 4 in addition to the lead stay 6 for supporting the discharge lamp 2, so that the number of parts is large and it takes time to assemble. There was a problem.

The present invention has been made in view of the above problems of the prior art,
It is an object of the present invention to provide a discharge lamp device having a simple structure capable of blocking ultraviolet rays emitted from the discharge lamp.

[Means for Solving the Problems]

In order to achieve the above object, in a discharge lamp device according to claim (1), a discharge lamp in which a discharge electrode is arranged to face each other in a sealed glass bulb, and a discharge lamp electrically connected to an electrode of the discharge lamp, A pair of lead wires respectively leading out from the front and rear ends of the lamp, a pair of long and short lead supports extending in parallel from the insulating base of the lamp socket to support the lead wires, respectively, and arranged at a position surrounding the discharge lamp. In a discharge lamp device provided with a glass tube for ultraviolet shielding, a lead wire leading from the discharge lamp is sealed at the front and rear ends of the glass tube for ultraviolet shielding, and the discharge lamp is provided with a glass for ultraviolet shielding. It is designed to be sealed in the pipe.

Further, in the discharge lamp device according to claim (2), a discharge lamp in which a discharge electrode is arranged to face each other in a sealed glass bulb, and an electrode of the discharge lamp are electrically connected to each other from the front and rear ends of the discharge lamp. A pair of lead wires leading out, a pair of long and short lead supports extending in parallel from the insulating base of the lamp socket to support the lead wires, respectively, and a glass tube for ultraviolet ray shielding arranged at a position surrounding the discharge lamp. In a discharge lamp device comprising: a pair of lead support lamp sockets, the protrusions from the insulating base are sealed at the rear ends of the glass tubes for ultraviolet shielding, and the discharge lamp is sealed in the glass tube for ultraviolet shielding. It is designed to be sealed.

[Action]

The discharge lamp is sealed in an ultraviolet shielding glass tube, and the ultraviolet rays emitted from the discharge lamp are reliably cut by the ultraviolet shielding glass tube.

Further, in claim (1), the glass tube for ultraviolet ray shielding is supported at both ends by a pair of lead wires which are led out from the front and rear ends of the discharge lamp and supported by a lead support, and in claim (2), The glass tube of is cantilevered by the root position of a pair of lead supports that projects from the insulating base of the lead support and supports the lead wires of the discharge lamp. No stay is required.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing a cross section of a part of a discharge lamp device according to an embodiment of the present invention.

In this figure, reference numeral 10 is a discharge lamp in which discharge electrodes 14, 14 made of tungsten are confronted in a glass bulb 12, and a rare gas for starting, mercury and a metal halide are provided in the glass bulb 12 made of quartz glass. Is enclosed. Pinch portions 13 and 13 are integrally formed on both ends of the glass ball 12, and molybdenum foil 15 connected to electrodes 14 and 14 in the glass ball 12 is sealed to the pinch portion 13. The other end of the molybdenum foil 15 is connected to lead wires 16a and 16b made of molybdenum and sealed to the pinch portion 13, and the lead wires 16a and 16b are connected to the pinch portion 1
It extends out from 3. And the lead wire 16 on the rear end side
b, the discharge lamp 10 and the lead wire 16a on the front end side extend in a straight line, and an ultraviolet shielding glass tube (hereinafter simply referred to as a glass tube) around the discharge lamp 10 for cutting ultraviolet rays from the emission of the discharge lamp 10. 20) are arranged.

The glass tube 20 is made of glass that does not transmit ultraviolet rays, such as soda glass, hard glass, or alumina silicate glass, and has a cylindrical shape with its front and rear ends closed. That is, the front end side lead wire 16a is sealed to the front end chip-off portion 20a of the glass tube 20, and the rear end side lead wire 16b is sealed to the rear end pinch portion 20b of the glass tube 20.
The structure is such that the discharge lamp 10 is sealed in 0. The glass tube 20 is filled with N ₂ gas, but it may be evacuated to reduce heat loss of the discharge lamp 10.

The rear end side lead wire 16b extending from the discharge lamp 10 penetrates and extends through the rear end pinch portion 20b of the glass tube 20, and the front end side lead wire 16a extends through the front end pinch-off portion 20b of the glass tube 20. I have put it out. The lead wires 16a, 16b are supported by a pair of long and short brass lead stays 24, 26 projecting in parallel from the front surface of the disk-shaped insulating base portion 32 of the lamp socket 30. The lead stay 24 supporting the front end side lead wire 16a extends below the glass tube 20 in parallel with the discharge lamp 10, the front end portion is bent upward, and the lead wire 16a is spot-welded to the upper bent portion 24a. There is. On the other hand, the front end portion of the lead stay 26 is bent downward, and the downward bending portion 26
The lead wire 16b is spot-welded to a. As described above, the glass tube 20 for shielding ultraviolet rays is integrated with the lead wires 16a and 16b led out from the discharge lamp 10, and the lead wire 1
The front and rear ends are supported by 6a and 16b. A ceramic discharge prevention insulating cylinder 25 is externally fitted to the lead stay 24 at a position facing the discharge lamp 10.

FIG. 2 shows another embodiment of the present invention. Lead wires 16a, 16b extending from the discharge lamp 10 are supported by lead stays 34, 36 made of molybdenum. The pair of long and short lead stays 34 and 36 is the insulating base 3 of the lamp socket 30.
The lead stay 36 is spot welded to the upper bent portion 16c of the rear lead wire 16b, and the front stay upper bent portion 34a of the lead stay 34 is spot welded to the front end side lead wire 16a. Has been done. Then, the positions of the lead stays 34, 36 near the roots of the protruding portions from the insulating base 32 are sealed to the rear end pinch portion 20b of the glass tube 20, and the glass tube 2
The structure is such that the discharge lamp 10 is sealed in 0. That is, the lead stays 34 and 36 have a structure in which the rear end portion of the glass tube 20 is supported in a cantilever shape. Also lead stay 34,3
6 is fixed to the bridge glass 40 in the glass tube 70, and reinforces the cantilever beam-like support structure of the lead stays 34 and 36 supporting the glass tube 20.

〔The invention's effect〕

As is clear from the above description, according to the discharge lamp device according to claims (1) and (2), since the discharge lamp is sealed in the glass tube for shielding ultraviolet rays, the discharge lamp emits light. UV rays can be reliably cut off, and the human body is not adversely affected.

Further, in any of claims (1) and (2), since the discharge lamp is sealed in the glass tube for shielding the ultraviolet rays, the discharge lamp is hard to cool after being turned off, and the rising of the luminous flux at the time of relighting is good. is there. Further, since it is less likely to be affected by the external environment, particularly the external temperature, the deterioration of the discharge lamp constituent members such as the lead wire and the lead stay and other constituent members around the lamp are reduced to that extent.

Further, the ultraviolet shielding glass tube is supported at both ends by a pair of long and short lead support portions via a pair of lead wires extending from the front and rear ends of the discharge lamp in claim (1), and in claim (2), a pair of long and short. Since the cantilever is supported by the lead support, an independent stay dedicated to the shielding member as in the prior art is not required, the number of parts can be reduced, and the lamp device can be easily assembled.

[Brief description of drawings]

FIG. 1 is a side view showing a cross section of a part of a discharge lamp device according to an embodiment of the present invention, FIG. 2 is a side view of another embodiment of the present invention, and FIG. 3 is a conventional discharge lamp device. It is a principal part side view of FIG. 10 ... Discharge lamp, 12 ... Glass bulb, 14, 14 ... Discharge electrode, 16
a, 16b ... Lead wire, 20 ... UV shielding glass tube, 24,26,3
4,36… Lead stay, 32… Insulating base of lamp socket.

Claims (2)

[Claims] 1. A discharge lamp in which discharge electrodes are arranged opposite to each other in a sealed glass bulb, a pair of lead wires electrically connected to the electrodes of the discharge lamp and led out from front and rear ends of the discharge lamp, respectively. In a discharge lamp device comprising a pair of long and short lead supports that extend in parallel from the insulating base of the socket and respectively support the lead wires, and a glass tube for ultraviolet shielding arranged at a position surrounding the discharge lamp, A discharge lamp device, wherein lead wires led out from a discharge lamp are sealed at front and rear ends of the ultraviolet shielding glass tube, and the discharge lamp is sealed in the ultraviolet shielding glass tube. 2. A discharge lamp in which discharge electrodes are arranged to face each other in a sealed glass bulb, a pair of lead wires electrically connected to the electrodes of the discharge lamp and led out from front and rear ends of the discharge lamp, respectively. In a discharge lamp device comprising a pair of long and short lead supports that extend in parallel from the insulating base of the socket and respectively support the lead wires, and a glass tube for ultraviolet shielding arranged at a position surrounding the discharge lamp, The protrusion from the insulating base of the lamp socket of the pair of lead supports is sealed to the rear end of the glass tube for ultraviolet shielding, and the discharge lamp is sealed in the glass tube for ultraviolet shielding. Characteristic discharge lamp device.