ショートアーク型水銀蒸気放電ランプ

Title:

ショートアーク型水銀蒸気放電ランプ

Document Type and Number:

Japanese Patent JP4400136

Kind Code:

B2

Abstract:

To provide a short arc type mercury vapor discharge lamp in which emission intensity maintenance factor is high and which has a long life by removing emission of ultraviolet rays of 250 nm or less and by emitting ultraviolet rays of 365 nm with high efficiency, and by suppressing deterioration of a quartz glass bulb.

This is the short arc type mercury vapor discharge lamp in which a positive electrode and a negative electrode are arranged opposed to each other in a quartz glass bulb in which titanium oxide is doped, a rare gas and mercury are filled, and the rare gas is at least one kind or more selected from crypton/argon/neon/helium and filled 1×105 Pa or more by 25°C conversion, and mercury is filled in the range from 0.2 mg/cm3to 10 mg/cm3per unit volume of the capacity inside the bulb. Then, when the maximum diameter of the positive electrode is made D (cm), its length L (cm), the half of the maximum diameter of the nearly spherical part of the bulb R (cm), 0.24≤(D×L)/R2≤1.34 applies, and when the average concentration of titanium in the bulb thickness direction is made N (wtppm), 5≤N≤60 applies.

Inventors:

Yukio Yasuda
Keisuke Okubo
Hiroshi Oshima

Application Number:

JP2003286645A

Publication Date:

January 20, 2010

Filing Date:

August 05, 2003

Export Citation:

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Assignee:

Ushio, Inc.

International Classes:

H01J61/88; H01J61/30

Domestic Patent References:

JP2001102002A
JP11191395A
JP57113550A
JP7291635A
JP11273619A
JP56130070A
JP7215731A
JP3276555A
JP10283998A

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