High-intensity discharge lamp

Abstract

A lamp having: an arc tube (30) including a main tube portion and a pair of thin tube portions (46) provided at ends of the main tube portion; and an adjacent conductor (78) including a strip-shaped metal plate. In the adjacent conductor (78), a portion of the metal plate in the direction of length thereof, from the middle of the metal plate to just before an edge thereof, is a gripping portion (92) having a shape suitable for gripping the outer circumferential of one of the thin tube portions (46). One end of the gripping portion (92) is a free end. The gripping portion (92) is disposed along an outer circumferential surface of the thin tube portion (46) so as to be in contact with the outer circumferential surface, and is elastically deformable in accordance with expansion in the radial direction of the thin tube portion (46).

Description

technical field [0001] The present invention relates to the improvement of the starting performance of high intensity discharge lamps. Background technique [0002] As technologies for improving the starting performance of high-intensity discharge lamps such as high-pressure mercury lamps and metal vapor discharge lamps, there are, for example, a technology of encapsulating a starting performance-improving substance in an arc tube (Patent Document 1), and a technology of providing an adjacent conductor in the arc tube ( Patent Documents 2 to 8) and the like. [0003] As adjacent conductors, there are conductors using metallic wire bundles (Patent Documents 2 to 6), conductors using conductive films (Patent Document 7), conductors using metal plates (Patent Document 8), and the like. [0004] In Patent Documents 2 to 6 using a wire bundle, there are described a technique of winding a wire bundle (multiple times) into a coil shape on a thin tube portion of an arc tube, a tech...

AI Technical Summary

Problems solved by technology

However, since it is difficult to connect the conductive film and the power supply line with metal leads, the connection between the conductive film and the power supply line will fall off during transportation.

[0019] In the technology described in Patent Document 8, since a metal plate is used, the contact area with the thin tube can be stably secured, and good starting performance can be obtained. , so there is a problem that the welding operation is complicated and the cost is high

In addition, there are problems such as that the welding of the facing part is peeled off due to thermal expansion of the thin tube part during lighting, or cracks are generated in the thin tube part due to the fastening stress of the metal plate.

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