JPH0479145A - Discharge lamp apparatus - Google Patents

Abstract

PURPOSE:To easily carry out formation of a metal support and make the durabil ity of a discharge lamp good and easily adjust the position of a discharge lamp by forming a non-pinch seal part of a circular glass pipe unitedly with a pinch seal part by extrusion and grasping the drawn part by a metal support. CONSTITUTION:Pinch seal parts 13a, l3b having rectangular transverse-section are formed in both end parts of an ellipse-shape sealed glass bulb 12 forming a discharging space and an extruded part 14 which is not pinch-sealed and has a circular pipe-like shape is formed unitedly with one pinch seal part 13a and the extruded part 14 is grasped by a metal support 30. Consequently, the extruded part 14 of a discharged lamp 10 grasped by the metal support 30 is a non pinch-sealed part free of residual stress and further since its shape is circular pipe-like shape in transverse-section and it is hard to converge the stress on the non pinch-sealed part as compared with one having a rectangular cross-section, the stress generated on the extruded part 14 becomes small by grasping the part by the metal support 30. As a result, a discharge lamp with good durability is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a discharge lamp device, and more particularly to a discharge lamp device comprising a discharge lamp having opposed discharge electrodes within a sealed glass bulb.

[Prior art]

This type of lamp device has a structure in which a discharge lamp 5 is supported by a pair of lead supports 3.4 projecting from a base 2, as shown in FIG. The discharge lamp 5 has electrodes 6, 6 arranged in a closed glass bulb 5a,
The glass bulb 5a is integrally formed with pinch seal parts 5b, 5b for sealing the molybdenum foils 7, 7 connected to the electrodes 6, 6, and the pinch seal parts 5b, 5b are connected to the molybdenum foil 7.7. The structure is such that the wires 8, 8 are led out to the outside. Metal supports 9a and 9b are welded and fixed to the lead supports 3 and 4, the lead wire 8 is welded to the metal support 9a at the rear end of the discharge lamp, and the pinch seal portion 5b of the discharge lamp is welded to the metal support at the front end. It is held by the body 9b.

[Problem to be solved by the invention]

However, in the above-described discharge lamp device, as shown in FIG. 5, the pinch seal portion 5b of the discharge lamp held by the metal support 9b has a rectangular cross section, so stress tends to concentrate particularly at the corner portion. . The stress from the pinch seal remains as initial stress (residual stress) in the pinch seal portion 5b.

The internal stress generated by being held by the metal support 9b is increased accordingly, and cracks are likely to occur at the corners of the pinch seal portion, resulting in a durability problem.

Furthermore, the metal support 9b is bent and formed into a shape that follows the rectangular cross-sectional shape of the minute pinch seal portion 5b, but it is not easy to form the metal support into such a minute shape, and it is difficult to form the metal support into such a minute shape. Errors in dimensional accuracy are likely to occur, and there are problems such as the grip being too loose or too tight. Further, since the metal support 9b and the pinch seal portion 5b each have a rectangular cross section, it is difficult to rotate them relative to each other, and there is also the problem that position adjustment of the discharge portion with respect to the reflector is restricted accordingly.

The present invention has been made in view of the problems of the prior art,
The purpose is to provide a discharge lamp device in which the metal support is easy to mold, the discharge lamp has good durability, and the position of the discharge lamp can be easily adjusted.

[Means to solve the problem]

In order to achieve the above object, in the discharge lamp device according to the present invention, both ends of a circular glass tube are pinch-sealed to have a rectangular cross section, and discharge electrodes are disposed oppositely in a central sealed glass bulb. A discharge lamp has a structure in which lead wires are led out from the seal part, and the pinch seal part is supported by a metal support fixed to a pair of long and short lead supports protruding from an insulating base, and the discharge lamp is integrated into the base. In the lamp device, a non-pinch seal portion of a circular glass tube is integrally formed to extend into the pinch seal portion;
This extending portion is held by a metal support.

[Effect]

The part of the discharge lamp that is held by the metal support (extension part) is a non-pinch seal part with no residual stress, and has a circular pipe cross section that is less likely to concentrate stress than a rectangular cross section. The internal stress caused by being held by the support is small.

The region of the band-shaped metal support that grips the discharge lamp has an arc shape that follows the outer periphery of the tubular extension, and is easier to mold than a rectangular shape.

Since the metal support and the discharge lamp grip are circular, they can be rotated relative to each other.
It is easy to adjust the position.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

1 to 3 show a first embodiment of the present invention,
FIG. 1 is a partially cutaway perspective view of the discharge lamp device;
FIG. 2 is a longitudinal cross-sectional view of the lamp device, and FIG. 3 is a cross-sectional view of the lamp device (a cross-sectional view taken along line m--■ shown in FIG. 2).

In these figures, the discharge lamp device includes a discharge lamp 10 that is a light emitting part, lead supports 22 and 24 that protrude from an insulating base 20 and support the discharge lamp 10, and a lead support 22 and 24 that surrounds the discharge lamp 10 for shielding ultraviolet rays. It mainly consists of a glove 40.

The discharge lamp 10 includes a pinch seal portion having a rectangular cross section at both ends of an ellipsoidal sealed glass bulb 12 that forms a discharge space by pinching one end and the other end of a circular pipe-shaped quartz glass tube. 13a.

13b is formed, and the glass bulb 12 is filled with a starting rare gas, mercury, and a metal halide.

Further, one pinch seal portion 13a is integrally formed with a circular pipe-shaped extension portion 14 that is not pinch sealed, and this extension portion 14 is held by a metal support 30, which will be described later. There is a tungsten discharge electrode 15 in the discharge space.
a, 15b are arranged facing each other, and the discharge electrodes 15a, 1
5b is connected to molybdenum foils 16a and 16b sealed to the pinch seal parts 13a and 13b, and the pinch seal part 1
Molybdenum foils 16a, 16b are attached from the ends of 3a, 13b.
Lead wires 18a and 18b respectively connected to are led out, and the lead wire 18a is inserted through the extension portion 14 and extends to the outside. The discharge lamp 10 has a structure in which both ends of the discharge lamp 10 are supported via metal supports 30.32 by a pair of long and short lead supports 22.24 which are insert-molded into the insulating base 20 and protrude forward from the base. Insulating base 2o
is made of a synthetic resin material such as PPS, and the lead support 22 has a flat terminal 23 that protrudes from the back side of the base 2o spot welded, and the lead support 24 also has an L-shaped terminal 23 that protrudes from the back side of the base 20. Terminals 25 are plasma welded.

The metal support 30 is formed by forming a belt-shaped metal plate with a constant width into a circular pipe shape to form an arc-shaped lamp gripping part 30a, and attaching plate-shaped flange parts 30b, 30b to form an extension part 14 of the discharge lamp. While holding the lamp with the lamp gripping part 22,
A flange portion 30b is spot welded to the tip of the lead support 30. Therefore, it is easy to slide the discharge lamp 10 in the axial direction (left and right direction in FIG. 1) and in the circumferential direction (in the direction of the cylindrical grip part) with respect to the grip part 30a. −
This makes it easy to adjust the position of the discharge part of the discharge lamp. A rear end lead wire 18a led out from inside the extending portion 14 of the discharge lamp is spot welded to the metal support 30.

The metal support 32 that supports the front end of the discharge lamp 10 is also formed from a band-shaped metal plate with a constant width, like the metal support 3o, and one end is fixed to the tip of the lead support 24 by caulking and spot welded. The other end is folded back to sandwich the front end side lead wire 18b and spot welded. Note that the reference numeral 26 is an insulating cylindrical body made of ceramic for preventing discharge and fitted around the outer periphery of the covering portion 24a of the lead support 24.

Further, on the front surface of the base 20, an annular glove mounting groove 28 is formed by a frame portion 27 having a rectangular cross section that is integrated with the base 2o. The outer flange portion 41 of is engaged and held. An O-ring 29 is loaded into the glove mounting groove 28, and this O-ring 29 elastically fixes and holds the outer flange portion 41 of the glove. Note that the frame-shaped portion 27
The outer flange portion 41 of the glove is placed on the O-ring 29, and with the O-ring 29 compressed, the frame-shaped portion 27 is placed.
By ultrasonically welding the forming member, a disc body having an R-shaped cross section to the base 20, it is integrally joined to the base 2o.

Reference numeral 40 denotes a transparent UV-shielding glove in the shape of a cylindrical cup with a closed front end, which is fixedly held on the insulating base 20 and connected to the lead supports 22, 24 and the discharge lamp 1.
0 is completely covered. glove 40
There is a glove attachment groove 28 on the base 2o side at the periphery of the opening.
An outer flange portion 41 is formed to engage with the glass globe, and an ultraviolet shielding film 4 made of ZnO is formed on the outer surface of the glass globe.
4 is coated. Therefore, when the globe 40 is held on the base 20, the ultraviolet shielding film 44 surrounding the discharge lamp 10 absorbs the ultraviolet rays generated at the same time as the discharge lamp 10 emits light, and only the visible light with the ultraviolet rays cut is transmitted to the globe 40. It is designed to emit light to the outside.

Note that in order to make the transmittance of ultraviolet rays shorter than 37 Onm wavelength O, a film thickness of 1.6 μm or more is required, and from the viewpoint of preventing peeling, a film thickness of 5 μm or less is desirable.

In addition, the wavelength range of ultraviolet rays that can be cut varies depending on the temperature around the glove (at high temperatures, the wavelength range that is cut shifts to the longer wavelength side), so at least the wavelength range of 370 to 3
The film thickness is said to be such that it can block ultraviolet rays of 80 nm or less. Note that the ultraviolet shielding film can be formed by dipping, vapor deposition, spraying, or other coating methods. If the film thickness is adjusted by dipping,
Soaking? This can be done by changing the speed at which the glove is pulled up from the Jl state, or by changing the number of times of dipping. Also, in other ways,
The film thickness can be increased by increasing the number of times of vapor deposition, spraying, etc.

Reference numeral 50 denotes a ventilation hole formed in the base 20, which communicates between the space around the discharge lamp in the globe 40 and the outside air, promotes the generation of convection within the globe 40, and prevents air between the inside and outside of the globe. This is to improve the heat dissipation effect by increasing the circulation of heat. Furthermore, by forming this hole 50, the material density near the wall surface where this hole 50 is formed is increased, and between the conductor A consisting of the terminal 23 and lead support 22 and the conductor B consisting of the terminal 25 and lead support 24. This has the effect of increasing the dielectric strength of the conductors A and B, thereby preventing discharge between the two conductors A and B.

Reference numeral 52 denotes a bulb (discharge lamp device) positioning protrusion provided on the front surface of the peripheral edge of the insulating base 20, which comes into contact with the wall surface of the bulb insertion hole (not shown) and moves the bulb in the front-rear direction (optical axis front-rear direction). positioning is performed.

Reference numeral 54 denotes a notch for positioning in the circumferential direction formed on the peripheral edge of the insulating base 20, and when a bulb (discharge lamp device) is inserted into a bulb insertion hole (not shown), a protrusion on the side of the bulb insertion hole is inserted. By engaging with this notch 54, the valve is positioned in the circumferential direction.

〔Effect of the invention〕

As is clear from the above description, according to the discharge lamp device according to the present invention, the portion (extending portion) of the discharge lamp held by the metal support is a non-pinch seal portion without residual stress, and further Since the cross section is a circular pipe shape that is less likely to concentrate stress than a princess-shaped cross section, the stress generated within this extension when held by a metal support is small, and there is no risk of damage to the extension. In other words, the discharge lamp has good durability.

In addition, the region of the band-shaped metal support that grips the discharge lamp has an arc shape that follows the outer periphery of the circular tubular extension, making it easier to form the metal support than in the case of forming it into a rectangular shape. This also facilitates the manufacture of the discharge lamp device.

Furthermore, since the metal support and the discharge lamp gripping part are circular, they can be rotated relative to each other, making it easier to adjust the position of the discharge lamp relative to the lifter.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of the discharge lamp device;
Fig. 2 is a longitudinal cross-sectional view of the lamp device, Fig. 3 is a cross-sectional view of the lamp device (a cross-sectional view along the line ■-m shown in Fig. 2),
Figure 4 is a side view of the previously proposed discharge lamp device.
FIG. 5 is a perspective view of the main parts of the device. DESCRIPTION OF SYMBOLS 10... Discharge lamp, 12... Sealed glass bulb, 13a, 13b... Pinch seal part, 14... Extension part, 15a, 15b - discharge electrode, 18a, 18b - lead wire, 2o... - Insulating base, 22.24... Lead support, 30... Band-shaped metal support, 3C) a... Lamp gripping part. Figure 2 Figure 3

Claims (1)

[Claims] (1) Pinch-seal both ends of a circular glass tube to have a rectangular cross section, and set discharge electrodes opposite each other in the sealed glass bulb in the center.
The discharge lamp has a structure in which lead wires are led out from the pinch seal part, and the pinch seal part is supported by a metal support fixed to a pair of long and short lead supports protruding from the insulating base, and is integrated with the base. In the discharge lamp device according to the present invention, a non-pinch seal portion of a circular glass tube is integrally formed in the pinch seal portion, and
A discharge lamp device characterized in that the extending portion is held by a band-shaped metal support.