JP2849276B2 - Discharge lamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp device,
More particularly, the present invention relates to a discharge lamp device in which an arc tube, which is a discharge lamp body having a counter discharge electrode in a closed glass bulb, is supported by a lead support projecting from an insulating base made of synthetic resin.

[0002]

2. Description of the Related Art FIG.
As shown in FIG. 3, a pair of metal lead supports 2, 3 acting as current paths from an insulating base 1 made of synthetic resin.
And the arc tube 4 which is the discharge lamp body is supported by the lead supports 2 and 3. The arc tube 4 has electrodes 5, 5 opposed to each other in a closed glass bulb 4 a, and leads 6 a, 6 b electrically connected to the electrodes 5, 5 and led out of the arc tube are connected to lead supports 2, 3. Fixed metal supports 7a, 7
b, and the lead supports 2 and 3 are welded and integrated to metal connector terminals 8a and 8b projecting from the back side of the base 1, respectively. Lead support 2 insert-molded into base 1 in a state integrated with terminal 8a
Is covered with a covering portion 1a rising from the base 1, and an insulating cylindrical body 9 made of ceramic is externally fitted to the covering portion 1a, so that the lead support 3, which is a current path on the side of the terminal 8b, the metal support 7b, Insulation between the lead wires 6b is ensured. Reference numeral 9a denotes a push-on fix for fixing and holding the insulating cylinder 9 to the lead support 2.
Reference numeral 1b denotes a collar-shaped focus ring formed on the base 1.
The electrodes 5, 5 are set to be at a fixed position with respect to the focus ring 1b. Reference numeral G denotes an ultraviolet shielding glove that cuts ultraviolet light in a wavelength range harmful to the human body from the light emitted from the arc tube 4.

[0003]

In the above-described discharge lamp device, the lead support 2, the covering portion 1a and the insulating cylinder 9 are provided so as not to hinder the progress of light emitted from the arc tube 4.
Is formed as small as possible in diameter. However, because of this, a thin covering portion 1a is formed on the outer periphery of the thin and long lead support 2, but the lead support 2 is deformed due to the pressure at the time of molding, and as shown in FIG. The thickness becomes uneven, and sometimes the coating 1a
Of the lead support 2 may be exposed from the
There is a problem that insulation between the lead supports 2 and 3 becomes insufficient and the lead supports cannot be continuously used for a long time.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a discharge lamp device having an insulating base having excellent dielectric strength.

[0005]

According to a first aspect of the present invention, there is provided a discharge lamp device according to the first aspect, wherein an arc tube through-hole and a lead support are provided on a front surface of a synthetic resin insulating base serving as a lamp holder. In addition to fixing an insulating ceramic disk provided with a through hole, a single lead support acting as a current path by externally fitting a ceramic insulating cylindrical body penetrates through the lead support through hole of the ceramic disk to provide insulation. inserted and fixed to the base of the lead support insertion hole, the front end portion of the arc tube is a discharge lamp body is supported by the lead support the front end, a rear extension portion of the arc tube, the arc tube through hole of the ceramic disc Penetrate and insert into the arc tube insertion hole of the insulating base, and fix it.
In addition, the focus ring formed separately from the insulating base is insulated
Aligning the arc tube fixed to the base
It is intended to be fixed .

[0006] According to claim 2, the discharge lamp device according to claim 1, wherein the insulating base side periphery of the arc tube through hole of the ceramic disk engages the insulating base of the arc tube insertion hole arc A tubular extension surrounding the rear end extension of the tube is formed .

[0007]

Since the covering part integral with the insulating base is not formed on the outer periphery of the lead support, the problem of insulation failure due to the uneven thickness of the covering part does not occur. In addition, the lead wire on the rear end side of the arc tube is surrounded by the rear end extension of the arc tube inserted and fixed in the arc tube insertion hole of the insulating base, while the lead support is in the lead support insertion hole of the insulating base. The insulation between the lead wire and the lead support is ensured by being surrounded by a ceramic insulating cylinder inserted and fixed to the base member. In addition, an arc tube fixed to an insulating base
Adjusting the position of the focus ring
After focusing, the focus ring is fixed to the insulating base.

In the second aspect, the lead wire on the rear end side of the arc tube is double surrounded by the rear end extension of the arc tube and the cylindrical extension of the ceramic disk.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment of the present invention. FIG. 1 is a perspective view of a discharge lamp device partially cut away, and FIG. 2 is a longitudinal sectional view of the discharge lamp device. In these figures, the discharge lamp device has an arc tube 10 as a discharge lamp body, an insulating base 20 made of synthetic resin as a lamp holder for supporting the rear end of the arc tube, and a rear end formed on the base 20. The arc tube 1 is supported and extends forward to function as a current path.
A metal lead support 30 for supporting the front end of the base 20 and a ceramic disk 40 fixed to the front surface of the base 20.
And a glove 50 for ultraviolet shielding surrounding the arc tube 10 and the lead support 30.

In the arc tube 10, pinch seal portions 13a and 13b having a rectangular cross section are formed at both ends of an oval-shaped closed glass sphere 12 forming a discharge space, and are further provided outside the pinch seal portions 13a and 13b. The glass bulb 12 has a starting rare gas, mercury, and a metal iodide sealed therein. In the discharge space of the closed glass bulb 12, discharge electrodes 15a, 15 made of tungsten are provided.
b, the discharge electrodes 15a and 15b are connected to the molybdenum foil 16 sealed to the pinch seal portions 13a and 13b.
a, 16b, and pinch seal portions 13a, 13b
The lead wires 18a and 18b connected to the molybdenum foils 16a and 16b respectively pass through the extending portions 14a and 14b and lead to the outside. The extension portion 14a on the front end side of the arc tube is provided with a metal support 3 spot-welded to a lead support 30 extending forward of the base 20.
2 and the lead wire 18a on the front end side of the arc tube.
Are spot-welded to the metal support 32. On the other hand, the extension portion 14b on the rear end side of the arc tube is provided with the arc tube insertion hole 2 provided on the front side of the insulating base 20.
1 and fixed by an adhesive 23. And the lead wire 18b on the rear end side of the arc tube
Is led out from the small hole 21a provided on the bottom surface of the insertion hole 21 to the back side of the base 20, and is spot-welded to a terminal 26a described later.

The insulating base 20 is made of, for example, a synthetic resin material such as PPS. On the front side of the base, an arc tube insertion hole 21 and a lead support insertion hole 24 are provided. Into the lead support insertion hole 24, a lead support 30 in which a ceramic insulating cylinder 38 is externally integrated is inserted and fixed by an adhesive 25. The rear end 30b of the lead support extends from the small hole 24a provided on the bottom surface of the insertion hole 24 to the rear side of the base 20, and is spot-welded to a terminal 26b described later. As described above, the arc tube 10 has its front end supported by the single metal lead support 30 projecting forward from the insulating base 20, and the base tube 20.
The rear end is supported by an arc tube insertion hole 21 formed on the front surface.

A pair of connector terminals 26a, 26b integrated with the base 20 by insert molding are provided on the back side of the insulating base 20, and a lead wire 18b led out from the rear end of the arc tube is connected to the terminal 26a. 26
b is welded to the rear end 30b of the lead support. A cylindrical wall 27 surrounding the terminals 26a and 26b is formed on the base 20 to form a male connector. Between the connector terminals 26a and 26b, a bifurcated cross-section partition wall 27a crossing the cylindrical wall 27 is formed, and this partition wall 27a is engaged with an engagement portion 28a of the female connector 28 side described later, which has a trifurcated cross-section. The insulation between 26a and 26b is ensured. High voltage cords C ₁ and C ₂ extending from a lighting circuit (not shown) are connected to the female connector 28, and a projection 28 b formed on the inner peripheral surface of the cord insertion hole of the female connector 28 connects the high voltage cords C ₁ and C ₂ . It is integrated. The inside of the case of the female connector 28 electrically connected to the code C _1, C _2, the connector terminals 26a of the male connector side, 26b that engage the terminal pins 29a, 29
b is provided. An engagement protrusion 28c is formed on the periphery of the opening of the case of the female connector 28 so as to engage with the engagement recess 27c on the base 20 side.

On the front surface of the insulating base 20, a ceramic disk 40 having a glove engaging groove 41 is provided.
It is fixed by the fastening screws 48. An arc tube through-hole 42 and a lead support through-hole 44 are formed in the ceramic disk 40, and the arc tube rear end side extending portion 14b and the lead support / ceramic cylinder integrated body penetrate these holes 42 and 44, respectively. I have. A cylindrical extension 43 is formed at the base side peripheral edge of the arc tube through hole 42 of the ceramic disk 40, and this extension 43 is formed by the large diameter portion 21 b of the arc tube through hole 21.
Is engaged.

The ultraviolet shielding globe 50 is bonded and fixed to the annular groove 41 of the ceramic disk 40 with an inorganic adhesive 46. The globe 50 is formed by coating an ultraviolet shielding film of ZnO or the like having an action of cutting ultraviolet rays in a harmful wavelength range on the front side and / or the back side of a cylindrical transparent glass body having a closed end. 30 and the arc tube 10.

Reference numeral 60 denotes an annular focusing ring provided on the peripheral portion of the base 20. The front surface of the focusing ring 60 is in contact with the peripheral portion of a valve insertion hole (not shown) of the reflector to provide a valve. A projection 60a for positioning in the front-rear direction, which is a positioning reference portion in the front-rear direction (front-rear direction of the optical axis) of the (discharge lamp device), is provided. A notch 60b is formed which engages with the engaging projection (not shown) of FIG. 1 to position the bulb (discharge lamp device) in the circumferential direction. The focusing ring 60 and the base 20 are joined to each other with a metal ring 6
2, the metal ring 62 is heated by high-frequency induction heating, and the mating surface of the focus ring 60 and the base 20 is welded and integrated.

Therefore, in this embodiment, the female connector 28 is connected to the male connector on the back side of the base 20 to be integrated as a discharge lamp device. Electrode 1
The focus ring 60 is axially and circumferentially moved and adjusted so that the positional relationship between the focus ring 5a and 15b is appropriate, and the focus ring 60 is welded and fixed to the base 20 by high-frequency induction heating. Adjustment is called aligning).

In the conventional discharge lamp device, as shown in FIG. 4, since the focusing ring 1b is formed integrally with the base 1, the alignment after fixing the arc tube 4 to the focusing ring 1b is performed. Can not. For this reason,
The metal supports 7a and 7b are moved with respect to the lead supports 2 and 3 so that the electrode position is appropriate with respect to the focus ring 1b, and the arc tube 4 is slid in the circumferential direction with respect to the metal supports 7a and 7b. Alignment had to be performed, and the alignment work was very troublesome. Moreover, since the arc tube 4 is moved, the arc tube 4 is aligned in a non-lighting state. However, the mercury sealed in the sealed glass bulb 4a adheres to the electrode 5, and the size of the electrode becomes larger than the regular size. The shape and position of the electrode cannot be clearly recognized. There is also a problem that the metal iodide, which is also sealed in the closed glass bulb 4a, adheres to the wall of the glass tube, making it difficult to visually recognize the electrode.

However, in this embodiment, the arc tube 1
0 can be lit and aligned, so the electrode 15
The mercury adhering to the a and 15b and the metal iodide adhering to the glass tube wall are vaporized due to the high temperature caused by the discharge between the electrodes 15a and 15b, so that the electrodes can be clearly recognized. It is also possible to align
Smooth and accurate alignment can be performed.

FIG. 3 is a longitudinal sectional view of a discharge lamp device according to a second embodiment of the present invention. The second embodiment differs from the first embodiment in that the connector cover 28, which is a female connector, is welded and integrated with the focusing base 60 to the insulating base 20 by high-frequency induction heating. . A second different point is that the engaging portion 28a of the female connector 28 that engages with the forked engaging portion 27a of the base that constitutes the female connector is a simple plate side.

[0020] More different third point is that it is directly spot welded to the lead support the rear end 30b of the feed line C ₄ of high voltage cord C ₂ projects into the base rear side.
A lead wire holder 66 is protruded from the base rear side by insert molding.
6 to the arc tube rear end side lead wire 18b and the feeder line C ₃ of the high-tension code C ₁ is a point that is spot welded.

The other parts are the same as those of the above-described embodiment, and the description thereof will be omitted by retaining the same reference numerals.

[0022]

As is apparent from the above description, according to the discharge lamp device of the present invention, the outer periphery of the lead support for supporting the arc tube is not formed with a coating portion integral with the insulating base. The problem of insulation failure due to uneven thickness of the coating does not occur.

The lead wire on the rear end side of the arc tube is surrounded by a rear end extension of the arc tube which is inserted and fixed in the arc tube insertion hole of the insulating base, while the lead support is a lead support of the insulating base. The insulation between the lead wire and the lead support is ensured by being surrounded by the ceramic insulating cylinder inserted and fixed in the insertion hole, so the insulation base of the insulation base has a large dielectric strength, and therefore discharge that can withstand long-term use A lamp is obtained. Also, fixed to the insulating base
The focus ring with respect to the arc tube
Can be aligned with an arc tube.
Compared to the conventional aligning that adjusts the position
The lining work is easy. Also, the arc tube
The electrodes can be lit and aligned, so the electrodes are clearly visible
And smooth and accurate alignment is possible.
You.

According to the second aspect of the present invention, the lead wire on the rear end side of the arc tube is doubly surrounded by the arc tube rear end extension portion and the cylindrical extension portion of the ceramic disk. A discharge lamp device having a larger size and more excellent durability can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a discharge lamp device according to an embodiment of the present invention, which is partially cut away.

FIG. 2 is a longitudinal sectional view of the discharge lamp device.

FIG. 3 is a longitudinal sectional view of a discharge lamp device according to another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a conventional discharge lamp device.

FIG. 5 is an explanatory diagram for explaining a problem of the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Arc tube which is a discharge lamp main body 12 Sealed glass ball 15a, 15b Counter electrode 20 Insulating base which is a lamp holder 21 Arc tube insertion hole 24 Lead support insertion hole 26a, 26b Connector terminal 30 Lead support 38 Ceramic insulating cylinder 42 Arc tube through hole 43 Cylindrical extension formed on the periphery of arc tube through hole of ceramic disk 44 Lead support through hole

Continuation of front page (72) Inventor Masami Handa 500 Kitawaki, Shimizu-shi, Shizuoka Prefecture Koito Manufacturing Co., Ltd. Shizuoka Factory (56) References JP-A-5-94764 (JP, A) (58) Field surveyed (Int) .Cl. ⁶ , DB name) H01J 5/50

Claims (2)

(57) [Claims] An insulative ceramic disc having an arc tube through-hole and a lead support through-hole is fixed to a front surface of a synthetic resin insulative base serving as a lamp holder, and a ceramic insulating cylinder is provided. A lead support acting as a current path is fitted through the lead support through hole of the ceramic disk, and is fixedly inserted into the lead support insertion hole of the insulating base. Part is supported by the front end of the lead support, the rear end extension of the arc tube is inserted through the arc tube through hole of the ceramic disk, and is fixedly inserted into the arc tube insertion hole of the insulating base. On the outer circumference, a focusing ring formed separately from the insulating base is attached to the arc tube fixed to the insulating base. A discharge lamp device which is aligned and fixed. 2. A cylindrical shape surrounding the rear end extension of the arc tube by engaging with the arc tube insertion hole of the insulating base at the peripheral edge of the arc tube through hole of the ceramic disk on the insulating base side. The discharge lamp device according to claim 1, wherein an extension portion is formed.