JP2948074B2 - Discharge lamp device for vehicles - 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 for a vehicle in which a bulb-side connector for inserting a power supply connector is integrally provided at a rear end of an insulating base supporting an arc tube.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view of a conventional discharge lamp device of this kind. The discharge lamp device has a structure in which an arc tube 2 is supported and integrated on a front surface of an insulating base 1 made of a synthetic resin, and a rear end of the insulating base 1 is provided with opposed electrodes 3a and 3b in the arc tube 2. The conductive connection terminals 4a and 4b are exposed, and a valve side connector b into which the power supply side connector a can be inserted is provided integrally.

[0003] The power supply side connector a is provided with a pair of female terminals (not shown) for sandwiching the terminals 4a and 4b of the valve side connector b.
When it is inserted into the connector, electrical continuity is secured between the terminals 4a and 4b on the connector a side and the female terminals on the connector b side. Reference numeral 5 denotes an upright wall that surrounds the connection terminals 4a and 4b and engages with the power supply side connector a. Code 6
Is an engagement protrusion provided on the upright wall 5 and is engaged with an engagement hole 7 provided on the power supply side connector a, whereby the connector a is prevented from coming off.

[0004]

However, in the above-mentioned prior art, the power supply side connector a can be inserted into and removed from the valve side connector b, and the engaging portion between the two connectors a and b has a small size. Gap is formed. For this reason, water or dust may enter the vertical wall 5, and in such a case, insulation between the connection terminals 4a and 4b may not be obtained. Also, since the insulating base 1 (standing wall 5) is made of synthetic resin, the discharge lamp device is dropped,
When an impact force acts on the tip of the standing wall 5, the standing wall 5 may be cracked or chipped, and the standing wall 5 may be damaged.
As a result, water and dust easily penetrate into the upright wall 5, which may cause insulation failure.

FIG. 7 shows that the insulating base 1 has
A discharge lamp having a cap-type connection terminal 7a and an annular connection terminal 7b provided on an upright wall 5 surrounding the terminal 7a, and integrally having a bulb-side connector c into which a power supply-side connector a can be inserted. Apparatus (Japanese Patent Application No. 5-2823)
No. 7), and the discharge lamp device having such a structure also has the same problems as those of the above-described prior art.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a vehicular discharge lamp device having excellent insulation between terminals of a bulb-side connector into which a power supply connector is inserted. It is in.

[0007]

In order to achieve the above object, in a vehicle discharge lamp device according to the present invention, a rear end portion of a synthetic resin insulating base supporting an arc tube is opposed to an arc tube. A connection terminal electrically connected to an electrode is exposed, a discharge lamp device for a vehicle provided with a bulb-side connector into which a power supply-side connector is inserted, wherein the bulb-side connector surrounds at least one of the connection terminals. An upright wall is formed to engage with the power supply side connector, and an elastic seal member is provided at the protruding end of the upright wall to press-contact a predetermined portion of the inserted power supply side connector to seal the inside of the upright wall. is there.

[0008]

The elastic sealing member provided at the protruding end of the upright wall surrounding the connection terminal of the valve side connector is pressed against a predetermined portion of the inserted power supply side connector to seal the inside of the upright wall to the outside, Prevents water and dust from entering the standing wall. Further, the elastic seal member reduces the impact acting on the protruding end of the upright wall and prevents the upright wall from being damaged.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 5 show a first embodiment of the present invention. FIG. 1 is a perspective view of a discharge lamp device according to a first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the discharge lamp device. FIG. 3 is a perspective view of the semi-rack disk as viewed from the front side, FIG. 4 is a perspective view of the ceramic disk as viewed from the back side, and FIG. 5 is a perspective view of a belt-like terminal mounting portion of the valve-side connector.

[0010] In these figures, the discharge lamp device comprises:
Arc tube 10 which is a light emitting part, and arc tube 1
0 and an ultraviolet shielding globe 50 surrounding the arc tube 10. The arc tube 10 is pinched near the end of the circular pipe-shaped quartz glass tube,
A structure in which 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 a starting rare gas, mercury and metal Iodide is enclosed. Discharge electrodes 15a and 15b made of tungsten are arranged in the discharge space so as to face each other, and the discharge electrodes 15a and 15b are molybdenum foils 16a and 1a sealed to pinch seal portions 13a and 13b.
6b. Pinch seal parts 13a, 13b
Lead wires 18a, 18b respectively connected to the molybdenum foils 16a, 16b are led out from the ends of the lead wire 1a.
8a is spot-welded to a front end of a lead support 36 described later. On the other hand, the lead wire 18b extends through the cylindrical extension portion 14 that is not pinch-sealed and is connected to the pinch seal portion 13b, extends outside, and is welded to a cap-type connection terminal 26 described later.

The arc tube holder 20 is fixedly integrated with a synthetic resin insulating base 21 having a rear end formed with a valve side connector B into which the power supply side connector A can be inserted, and a front part of the base 21. A ceramic disc 30 supporting the rear end of the arc tube 10 and the rear end opening of the ultraviolet shielding globe 50, and a metal extending through the disc 30 and extending forward to support the front end of the arc tube 10. And a read support 36 of the above.

A ceramic disk 30 is fixed to the front surface of the insulating base 21 by screws 31 screwed at three equally spaced positions in the circumferential direction. As shown in FIGS. 2 and 4, the outer peripheral edge of the disk 30 slightly protrudes toward the base 21. The peripherally provided protruding portion 30a exposes the mating portion between the base 21 and the disk 30 to the outside. Without, it is excellent in appearance. Also, on the back surface of the disk 30, projections as shown by reference numeral 30b in FIG.
On the other hand, the projection 30 b
And a recess (not shown) for engaging with the projection 3
The disc 30 and the base 21 are positioned in the circumferential direction by engaging Ob with the engaging recess on the base 21 side. A circular hole 32 is provided in the center of the disk 30, and the arc tube 10 penetrates the circular hole 32 and engages with an arc tube engaging hole 24 provided on the front surface of the insulating base 21. . The circular hole 32 is loaded with an inorganic adhesive and fixedly supports the rear end extension 14 of the arc tube 10. The circular hole 32 is provided with two opposing semicircular portions 32a, and by supplying an inorganic adhesive through the semicircular portions 32a, the adhesive is supplied to the circular holes 32a.
Can be supplied smoothly.

An engagement hole 24 formed in the base 21
Is formed to have a size slightly larger than the rear end extension 14 of the arc tube, so that the extension 14 does not contact the inner wall of the engagement hole 24 at all. That is, the electrodes 15a, 1
Since the arc tube 10 becomes hot due to the discharge between the electrodes 5b, the arc tube rear end extension 14 also becomes hot, and the insulating base 21 made of synthetic resin is easily affected by high heat. However, the arc tube engaging hole 24 is made larger than the rear end portion 14 of the arc tube to form a heat insulating air layer around the rear end of the arc tube. A concave portion 24b whose peripheral edge of the insertion hole slightly protrudes from the front surface of the base is provided, so that the contact area between the base 21 and the disk 30 is reduced, whereby heat on the arc tube 10 side is insulated. It is difficult to be transmitted to the base 21 side. Therefore, the influence of the high heat of the base 21 (denaturation deterioration) is reduced, and the durability of the base 21 is increased accordingly. Further, since it is not necessary to select the material of the base 21 in consideration of heat resistance as in the related art, the selection range of the material (synthetic resin material) that can be used for molding the base is expanded accordingly. Also, since a sufficient gap (insulated air layer) is formed between the rear end extension 14 of the arc tube and the inner wall of the engagement hole 24, the arc tube (glass)
Even if there is a large difference between the thermal expansion coefficient and the base (synthetic resin), there is no possibility that they will interfere with each other.

A ceramic insulating cylinder 37 for preventing discharge is fitted on a lead support 36 extending forward through the ceramic disk 30, and a rear end of the insulating cylinder 37 is ceramic. It is inserted through the through hole 33 provided in the disc 30 and the insulating cylinder insertion hole 22 provided in the base 21 and is positioned and fixed by the inorganic adhesive loaded in these holes 33 and 32.

A lead wire 18b extending from the rear end extension 14 of the arc tube 10 is provided with a small hole 25a provided in a columnar projection 25 projecting rearward from the rear end of the base 21.
And is welded to a cap-type connection terminal 26 that is externally fitted and fixed to the projection 25. The cap-type terminal 26 is provided with a slit (not shown) extending in the vertical direction, so that the terminal 26 can be easily inserted into the protruding portion 25, and the terminal 26 has a close contact with the protruding portion 25. Has been raised. A cylindrical upright wall 27 surrounding the cap-type connection terminal 26 is formed at the rear end of the base 21, and at the base of the upright wall 27, spot welding or laser welding is performed on the rear end of the lead support 36. A belt-shaped connection terminal 28 welded by the above is fitted.

As shown in FIG. 5, the belt-like terminal 28 is mounted in a shallow concave groove 21a provided around the root of the standing wall 27, and is substantially flush with the outer surface of the base 21 (the outer surface of the standing wall 27). It is formed in one. The terminal 28 has an inwardly bent portion 2
8a, the bent portion 28a is engaged with the engaging concave portion 21b formed in the concave groove 21a, so that the belt-shaped terminal 28 is positioned in the circumferential direction, and a lead support is provided on the inner bent portion 28a. 36 is laser welded. The base-side connector B is constituted by the belt-shaped connection terminal 28 and the cap-type connection terminal 26 which is fitted over the projection 25.
And a power supply side connector A is inserted thereinto.

Reference numeral 23 denotes a power supply connector A which protrudes from the outer periphery of the base 21 and engages with the J slot 66 of the power supply connector A inserted into the valve side connector B.
Are a pair of protruding pins for preventing the base member (base side connector B) from coming off. Power supply connector A
Has a structure in which tongue-shaped terminals 62 and 64 are provided in a connector case 60 having a cylindrical outer peripheral wall capable of engaging with the standing wall 27 of the base 21. When the power supply side connector A is inserted into the valve side connector B, the terminal 62 sandwiches the cap-type connection terminal 26 and the terminal 64 presses against the belt-like terminal 28, thereby connecting the connectors A and B. Is conducted.

A groove 27 is formed on the outer periphery of the protruding end of the standing wall 27.
a, and a packing 29 for sealing the inside of the standing wall 27 is mounted in the concave groove 27a. That is, in a state where the connector A is inserted into the connector B, the packing 29 is attached to the bottom surface 61 of the concave portion 61 for engaging the vertical wall of the connector case 60 (FIG. 2).
(See FIG. 2), the engagement between the connector case 60 and the standing wall 27 is sealed, and the inside of the standing wall 27 is sealed. For this reason, since there is no possibility that water, dust, and the like enter the vertical wall 27, insulation between the terminal 26 and the terminal 28 is ensured.

The concave groove 27a for mounting the packing is formed in a tapered shape whose diameter increases toward the tip end of the upright wall 27, and the cross section of the packing 29 is formed in a trapezoidal shape matching the concave groove 27a. Since the attached packing 29 is prevented from falling off, the reliability of attachment is improved. When an impact force acts on the protruding end of the standing wall 27 by dropping the discharge lamp device or hitting an object,
Since this impact force is reduced by the packing 29, the standing wall 27 is less likely to be damaged.

When the connector A is inserted into the connector B, the compressed gasket 29 acts between the J-slot 66 and the protruding pin 23, so that the fastening force between the connectors A and B is high. . Reference numeral 38 indicates a base 2
1 is a focusing ring externally fitted via a metal ring member 39. The focusing ring 38 is integrated with the base 21 by high-frequency induction heating of the ring member 39. The screw 31 for fixing the ceramic disk 30 to the base 21 is formed of the metal ring member 4 to be heated by high-frequency induction.
2, the screw 31 is made of brass that does not generate heat even when exposed to high frequency, so that applying high frequency to the ring member 39 to weld the focusing ring 38 to the vicinity of the screw 31 has no effect. There is no.

The ultraviolet shielding globe 50 is formed by coating an ultraviolet shielding film having an ultraviolet shielding action such as ZnO on the outside and / or inside of the hard glass glove.
Ultraviolet rays in a wavelength range harmful to the human body and lamp components are cut off from the light emitted from the discharge portion of the arc tube 10. The front end of the ultraviolet shielding globe 50 is spherical, and the rear end opening is engaged with the front recess 35 of the disk 30. In addition, an inorganic adhesive is loaded into the engaging portion between the globe 50 and the disk 30 so that the inside of the globe 50, that is, the periphery of the arc tube 10, is isolated from the outside of the globe 50, thereby providing a discharge lamp. The low molecular siloxane generated in the lamp room space of the lamp in which the device is arranged cannot enter the globe 50, and SiO ₂ does not adhere to the surface of the arc tube 10 which becomes hot.

In the above-described embodiment, a belt-shaped connection terminal 28 is provided on the outer periphery of an upright wall 27 surrounding the cap-type connection terminal 26, and the valve-side connector has a structure in which the terminals 26, 28 are separated by the upright wall 27. The discharge lamp device provided with B has been described, but the present invention, as shown in FIG.
The present invention can also be applied to a discharge lamp device provided with a bulb-side connector having a structure in which two connection terminals 4a and 4b are both housed in an upright wall 5.

[0023]

As apparent from the above description, according to the discharge lamp device of the present invention, when the power supply connector is inserted into the bulb connector provided at the rear end of the insulating base, Since the inside of the upright wall surrounding the connection terminal of the valve-side connector is securely sealed by the elastic sealing member, the problem of poor insulation between the connection terminals due to water or dust entering the upright wall is eliminated.

Further, since the protruding end of the upright wall is protected against impact by the elastic sealing member, the risk of damage to the upright wall is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a discharge lamp device according to an embodiment of the present invention.

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

FIG. 3 is a perspective view of the ceramic disk fixed to the front surface of the insulating base as viewed from the front side.

FIG. 4 is a perspective view of the same disk as viewed from the rear side.

FIG. 5 is a perspective view of a belt-shaped terminal mounting portion of the valve-side connector.

FIG. 6 is a perspective view of a conventional discharge lamp device.

FIG. 7 is a perspective view of a discharge lamp device according to an earlier application.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Arc tube 14 Extension part which is the rear end of arc tube 20 Arc tube holder 21 Insulating base 23 Protruding pin 24 Hole which can be engaged with the rear end of arc tube provided on insulating base 26 Cap type of valve side connector Connection terminal 27 Standing wall 27a Groove for mounting packing 28 Belt-like connection terminal of valve side connector 29 Packing as elastic seal member 30 Ceramic disc (insulating disc) 36 Lead support 50 Ultraviolet shielding glove 62 J slot 62 Power supply side Connector tongue-shaped connection terminal 64 Tongue-shaped connection terminal of power supply side connector A Power supply side connector B Valve side connector

Claims (1)

(57) [Claims] 1. A connecting terminal for conducting to a counter electrode of an arc tube is exposed at a rear end portion of a synthetic resin insulating base supporting an arc tube, and a valve side connector to which a power supply side connector is inserted is provided. In the vehicle discharge lamp device, an upright wall surrounding at least one of the connection terminals and engaging with the power supply side connector is formed in the bulb-side connector, and a protruding end of the upright wall has an insertion wall. A discharge lamp device for a vehicle, comprising: an elastic sealing member that presses against a predetermined portion of the attached power supply side connector and seals the inside of the upright wall.