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Discharge lamp

A discharge lamp and discharge space technology, which is applied to discharge lamps, gas discharge lamps, and parts of gas discharge lamps, etc., can solve the problems of complicated structure and weight of lamps that are difficult to avoid, and can prevent the generation of glare and reduce the dispersion effect

Inactive Publication Date: 2004-04-21
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Therefore, in order to prevent glare, it is necessary to install an additional visor to shield unnecessary light incident on the front glass 44, so it is difficult to avoid the complexity of the structure of the lamp and the increase in weight.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] figure 1 is a side view of the discharge lamp according to Embodiment 1 of the present invention. The discharge lamp shown in this figure is an example of a metal halide lamp used in an automobile headlight. figure 2 yes figure 1 The discharge lamp shown is a sectional view taken along the length of a plane containing the axis 21 .

[0044] Such as figure 1 , 2 As shown, the discharge lamp of this embodiment has an arc tube 1 inside an outer tube 6. The arc tube 1 is provided with a light emitting portion 1c and a pair of flat sealing portions 1a, 1b connected to both ends of the light emitting portion 1c. A discharge space 1d is formed in the light emitting part 1c, and mercury and metal halide ScI are sealed in the discharge space 1d. 3 , NaI and xenon as an inert gas for starting. and, in figure 1 In order to facilitate understanding, the main structure of the luminous tube 1 in the transparent outer tube 6 is marked by a solid line ( Figure 5 , 7 same...

Embodiment 2

[0072] Figure 5 is a side view of a discharge lamp according to Embodiment 2 of the present invention. The discharge lamp shown in this figure is an example of a metal halide lamp for automobile headlights. Figure 6 is through Figure 5 A cross-sectional view of the III-III line at the center point A between the electrodes 2a, 2b. According to the discharge lamp of this embodiment, its structure is the same as that of Embodiment 1 except for the formation range of the light-shielding film.

[0073] Such as Figure 5 , 6 As shown, on the outer surface of the outer tube 6, two strip-shaped light-shielding films 14, 15 parallel to the axis 21 of the luminous tube and separated from each other are formed in the area near the electrode 2.

[0074] Figure 6 The angle γ shown is the angle formed by the line 16a connecting the upper end 16 of the light shielding film 14 through point A and the line 17a connecting the upper end 17 of the light shielding film 15 through point A...

Embodiment 3

[0088] Figure 7 is a side view of a discharge lamp according to Embodiment 3 of the present invention. The discharge lamp shown in this figure is an example of a metal halide lamp for automobile headlights. Figure 8 is through Figure 7 A cross-sectional view of the IV-IV line at the center point A between the electrodes 2a, 2b. According to the discharge lamp of this embodiment, the configuration other than the formation range of the light-shielding film is the same as that of the first and second embodiments described above.

[0089] On the outer surface of the outer tube 6, two strip-shaped light-shielding films 14, 15 are formed parallel to the axis 21 of the arc tube and separated from each other in a region located near the electrode 2. As shown in FIG. Figure 8 The angle γ shown is the angle formed by the line 16a connecting the upper end 16 of the light shielding film 14 through point A and the line 17a connecting the upper end 17 of the light shielding film 15 t...

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Abstract

A discharge lamp which enables glare reduction, so that a lighting fixture can be simplified and reduced in weight. The discharge lamp includes an arc tube (1) having a discharge space (1d), a pair of electrodes (2a,2b) having tips facing with each other within the discharge space (1d), an outer tube (6) enclosing the arc tube (1), a base that fixes one side of the outer tube (6), and two band-shaped light-intercepting films (14,15) extending on a surface of the outer tube (6) in the direction of the axis of the arc tube (1) and in parallel with each other, wherein in at least one of the light-intercepting films (14,15), an extending portion (15a) is formed that extends on the side of the top (27) of the outer tube (6) with respect to the tip of the electrode (2a) within the discharge space (1d) and in the circumferential direction of the outer tube (6).

Description

technical field [0001] The present invention relates to a discharge lamp used in a headlamp, and more specifically, to a shape of a light-shielding film for a lamp having a light-shielding film. Background technique [0002] When discharge lamps are used as light sources for automobile headlights or liquid crystal floodlights, they are used in combination with reflectors. In recent years, in order to prevent deterioration of reflectors by ultraviolet rays emitted from discharge lamps, discharge lamps in which an outer tube is made of glass that blocks ultraviolet rays have been widely used. [0003] In general, in order to achieve an appropriate light distribution by combining a reflector and a discharge lamp, it is required to set the position of the light-emitting portion, that is, the arc, with respect to the reflector with extremely high accuracy. [0004] However, it is very difficult to mechanically set the light distribution of the arc as the light-emitting part of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F21S8/10F21V11/16H01J61/04H01J61/35
CPCF21S48/145H01J61/35H01J61/04H01J61/025F21S48/1186F21S41/172F21S41/43
Inventor 桐生英明村濑隆幸
Owner PANASONIC CORP