JPH0541002U - Discharge lamp for vehicle lighting - Google Patents

Abstract

(57) [Abstract] [Purpose] In a conventional discharge lamp for a vehicle, the passing beam distribution characteristic cannot be obtained due to the characteristics of the discharge tube that emits light in all directions. It was impossible to form a headlamp. [Structure] By providing a shade 1 formed of an opaque member on the discharge part 11a of the discharge lamp 10 and covering substantially the lower half part,
When the discharge lamp 10 is incorporated in a vehicular lamp, a rotating parabolic reflecting mirror is used to block a portion that becomes upward reflected light, and a passing beam distribution characteristic can be formed to solve the problem.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 It is an object of the present invention to provide a discharge lamp suitable for use as a light source of a vehicle lamp, particularly a lighting lamp such as a headlamp.

[0002]

[Prior Art]

 6 and 7 show an example of the configuration of a conventional discharge lamp 10 of this type. First, the discharge lamp 11 of FIG. 6 is suitable for use in a vehicle lamp (not shown). The discharge unit 11a, which is the light-emitting unit of the discharge tube 11, has a predetermined position such as the focus position of a reflector having a paraboloid of revolution. It can be installed in the.

Further, FIG. 7 shows a structure in which a filter cap 13 for covering the above-mentioned discharge tube 11 is added in addition to the structure of the above-mentioned discharge tube 11 and fixed focus base 12, and the filter cap 13 is a vehicle lamp. Is attached for the purpose of preventing the deterioration of the resin lens of the vehicular lamp due to the emission of a relatively large amount of ultraviolet rays from the discharge tube 11. .. In any of the above cases, as the discharge tube 11, a metal halide discharge tube having an excellent color rendering property is used.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional discharge lamp 10, the discharge part 11a of the discharge tube 11 emits light uniformly in almost all directions. Only the traveling beam light distribution characteristic MB including the upward light as shown is obtained, and as the light distribution characteristic of the vehicular lamp, the upward light, which is required together with the traveling beam light distribution characteristic described above, is almost entirely present. There was a problem that the cross beam distribution characteristics cut into two could not be obtained, and the solution to this point was a problem.

[0005]

[Means for Solving the Problems]

 The present invention is, as a concrete means for solving the above-mentioned conventional problems, a discharge lamp for a vehicle, which is formed so that a discharge part is arranged at a substantially focal point of a rotating parabolic reflector of a lamp for a vehicle. The problem is solved by providing a discharge lamp for a vehicular lamp, wherein the discharge lamp is provided with a shade covering an approximately lower half portion with an opaque member.

[0006]

【Example】

 Next, the present invention will be described in detail based on an embodiment shown in the drawings. In order to facilitate understanding, the same parts as those of the conventional example will be described with the same reference numerals, and the description of the overlapping parts will be partially omitted. FIG. 1 shows a first embodiment of the present invention. In this embodiment, a shade 1 is externally provided on a discharge part 11a of a discharge tube 11 of the discharge lamp 10, that is, a light emitting part. As for the passing beam distribution characteristic SB as shown in FIG. 2, it has the same function as the passing filament of the H4 halogen bulb in which the light shielding hood is integrally provided in the lower half part. ..

Next, a specific configuration for providing the shade 1 will be described. As the discharge tube 11, a double end type in which electrodes are normally provided at both ends of the discharge part 11a is adopted. When forming 10, the discharge tube 11 is directly attached to the fixed focus die 12 at one end, and the other end is attached to the fixed focus die 12 via the stay 11b to conduct electricity and mechanically support. It has become a thing.

In this embodiment, the shade 1 is attached to an appropriate position of the stay 11b by, for example, welding to cover a predetermined range of the discharge part 11a. At this time, the shade 1 has a light-shielding property. It is preferable to be formed of a metal from the viewpoints of excellentness, being capable of welding at the time of mounting as described above, and being excellent in heat resistance.

3 is a second embodiment of the present invention, which is similar to the first embodiment described above in that the shade 1 covers the discharge portion 11a, but this embodiment is the same as the first embodiment. In the example, the shade 1 is not fixed to the stay 11b, but one end is fixed to a separately provided shade support stay 2, and the other end of the shade support stay 2 is fixed to the fixed focus ferrule 12. This allows it to be supported in place.

At this time, as shown in FIG. 4, a ring 3 is provided on the other end side of the shade support stay 2, and the ring 3 is provided on the fixed focus base 12 and the vehicle lamp. If it is mounted by sandwiching it with a reflecting mirror (not shown), it is possible to freely select whether the shade 1 is installed or not. For example, the discharge lamp 10 is commonly used for a traveling beam and a passing beam. It is possible to achieve this, and it is even more preferable.

FIG. 5 also shows a third embodiment of the present invention, which corresponds to the discharge lamp 10 provided with the filter cap 13 described in the conventional example. The same effect can be obtained by forming the light shielding film 4 covering the lower half of the filter cap 13 instead of the shade 1 covering the discharge part 11a employed in the second embodiment.

In forming the light-shielding film 4, it may be formed by coating with an opaque paint having excellent heat resistance, or may be formed by vapor deposition of a metal, or by pressing a metal plate. Any forming method may be used as long as it can be formed by molding and is essentially opaque and can withstand the temperature rise generated in this portion.

Further, although not shown, also in the discharge lamp 10 provided with the filter cap 13, the shade 1 for covering the discharge portion 11a may be attached as described in the first embodiment, for example. It goes without saying that it is free.

[0014]

[Effect of the device]

 As described above, according to the present invention, by providing the discharge lamp with the shade that covers the lower half of the discharge lamp with the opaque member, when the discharge lamp is attached to the reflecting mirror of the paraboloid of revolution in an appropriate position. The same light distribution characteristics as the halogen bulb can be obtained, and it is possible to realize a headlamp that requires a running beam and a passing beam with this type of discharge lamp. It has an excellent effect on improvement.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a discharge lamp of a vehicular lamp according to the present invention.

FIG. 2 is an explanatory view showing a light distribution characteristic of the discharge lamp according to the present invention.

FIG. 3 is a sectional view showing a second embodiment of a discharge lamp of a vehicular lamp according to the present invention.

FIG. 4 is a perspective view showing a main part of a second embodiment.

FIG. 5 is a sectional view showing a third embodiment of the same discharge lamp.

FIG. 6 is a cross-sectional view showing a conventional discharge lamp.

FIG. 7 is a cross-sectional view showing another conventional example.

FIG. 8 is an explanatory diagram showing a light distribution characteristic of a conventional discharge lamp.

[Explanation of symbols]

 1 ... Shade 2 ... Shade support stay 3 ... Ring 4 ... Shading film 10 ... Discharge lamp 11 ... Discharge tube 11a ... Discharge part, 11b ... Stay 12 ... Focus cap 13 ... Filter cap

Claims (3)

[Scope of utility model registration request] 1. A discharge lamp for a vehicle, wherein a discharge portion is arranged substantially at a focal point of a rotary parabolic reflector of a lamp for a vehicle. A discharge lamp for a vehicle lamp, comprising a shade for covering the vehicle. 2. The shade is provided in contact with the discharge portion of the discharge lamp.
A discharge lamp for the vehicle lighting described. 3. The discharge lamp of a vehicular lamp according to claim 1, wherein the shade is provided in contact with a filter attached to the discharge lamp.