Short-arc type high pressure discharge lamp and lamp apparatus

Abstract

A short-arc type high pressure discharge lamp in which durability is improved and a lamp apparatus including the same is provided. Glass material portions 52A into which glass material enters respectively are provided on both sides of an electrode axis 5402 between the outer circumferential surface 5406 thereof and a curved portion 58 of a sealed metal foil 56, and a gap S3 being continuous with a sealed space 60 remains among the glass material portion 52A, the outer circumferential portion 5406 of the electrode axis 5402, and the curved portion 58. An angle formed by a surface 52-1 of the glass material portion 52A facing the gap S3 and the curved portion 58 is an obtuse angle. In other words, an angle formed by the surface 52-1 of the glass material portion 52A facing the gap S3 and a surface 5602 of the curved portion 58 of the sealed metal foil 56 is the obtuse angle.

Description

technical field [0001] The invention relates to a high-pressure discharge lamp of the short-arc type and a lamp arrangement comprising the high-pressure discharge lamp. Background technique [0002] A short-arc type high-pressure discharge lamp is used as a light source for a projection type projector. figure 1 is a cross-sectional view showing a prior art short-arc high-pressure discharge lamp; figure 2 is a cross-sectional view showing a manufacturing process of a conventional short-arc high-pressure discharge lamp; Figure 3A to Figure 3C is along figure 2 The cross-sectional view taken along line A-A of ; Figure 4 is an enlarged view showing the electrode shaft and the sealed metal foil; FIG. 5A is an enlarged view of the electrode shaft and the sealed metal foil, and FIG. 5B is an enlarged view showing details inside the circle in FIG. 5A. [0003] Such as figure 1 As shown, a short arc type high pressure discharge lamp 10 includes a discharge vessel 12 made of ...

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Problems solved by technology

In addition, since the glass material portion 12A may not be completely entered into each concave portion and form the gap S2 continuous with the sealed space 20, and similarly to the above, since the surface of the glass material portion 12A facing the gap S2 12-2 and the surface 1604 of the sealed metal foil 16 form an acute angle θ, so when the short-arc high-pressure discharge lamp 10 is lit, similar to the above, due to the substantially wedge-like movement along the back of the sealed metal foil 16 Strong forces acting on the boundary surface between surface 1604 and surface 12-2 of glass material portion 12A may cause cracks to form

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