Discharge lamp having a plurality of coating layers

Electric lamp and discharge devices – With gas or vapor – Envelope with particular structure

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313489, 313112, 313634, H01J 1716

Patent

active

058617159

ABSTRACT:
A discharge lamp in which ultraviolet radiation of short wavelengths can be advantageously cut and in which the amount of emitted light (i-line) of 365 nm wavelength can be increased is achieved according to the invention by providing a quartz glass arc tube that is coated with a plurality of coating layers which include a layer which has Ta.sub.2 O.sub.5 as the main component, and at least one additional coating layer which has a refraction coefficient which differs from the refraction coefficient of the coating layer having the Ta.sub.2 O.sub.5 main component. These layers act to prevent the reflection of light with a wavelength of 365 nm which is incident on the coatings on the arc tube and to cut at least 50% of the ultraviolet radiation having wavelengths of 230 nm or less. According to the invention, the coating layers can be provided on the outer side of the arc tube, on the inner side of the arc tube, or on both on the inner and outer sides of the arc tube.

REFERENCES:
patent: 4524410 (1985-06-01), Kawakatsu et al.
patent: 4721877 (1988-01-01), Kawakatsu et al.
patent: 5550423 (1996-08-01), Oughton
patent: 5552671 (1996-09-01), Parham et al.
patent: 5646472 (1997-07-01), Horikoshi

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