Title:
QUARTZ GLASS FOR SHORT WAVE LENGTH ULTRAVIOLET RAY, DISCHARGE LAMP USING THE SAME, CONTAINER THEREFOR AND ULTRAVIOLET IRRADIATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2002/024587
Kind Code:
A1
Abstract:
A quartz glass to be used through exposure to an ultraviolet ray having a wave length of 200 nm or less, characterized in that it is produced from natural rock-crystal or silica sand, has a total content of sodium, potassium, titanium and iron of 2.5 ppm or less and contains an OH group in an amount of 10 ppm or more; and an ultraviolet irradiation apparatus wherein the quartz glass is used as the material of a bulb (11) of a light emitting tube of an ultraviolet discharge lamp (L), and as the material of an ultraviolet-transmittable outer tube or protecting tube (20) housing the ultraviolet discharge lamp. The quartz glass is improved with respect to the lowering of the transmittance of an ultraviolet ray in a shorter wave length region with the elapse of time, which leads to the provision of a discharge lump and an ultraviolet irradiation apparatus which are greatly improved in the degree of retention of ultraviolet ray strength, and thus can be operated at a reduced cost and with saving energy.
Inventors:
NAKANO KOJI (JP)
Application Number:
PCT/JP2001/008197
Publication Date:
March 28, 2002
Filing Date:
September 20, 2001
Export Citation:
Assignee:
PHOTOSCIENCE JAPAN CORP (JP)
NAKANO KOJI (JP)
NAKANO KOJI (JP)
International Classes:
C03C3/06; C03C4/00; H01J61/30; (IPC1-7): C03B20/00; C03C3/06; H01J61/30
Foreign References:
| JPH06305767A | 1994-11-01 | |||
| JPH1160264A | 1999-03-02 | |||
| JP2000086259A | 2000-03-28 | |||
| JPS6230632A | 1987-02-09 | |||
| US5572091A | 1996-11-05 |
Attorney, Agent or Firm:
Iizuka, Yoshihito (Hongo 5-chome Bunkyo-ku, Tokyo, JP)
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