Patent · US Expired

Method for coating the quartz burner of an HID lamp

US7306830B2 · kind B2 · utility

0Cited by

9References

12Claims

0Family size

Assignee

Schott AG · DE

Inventors

Wolfgang Moehl · Worms, DE
Lars Bewig · Bad Gandersheim, DE
Thomas Kuepper · Bad Gandersheim, DE
Wolfram Maring · Hamburg, DE
Christopher Moelle · Bad Gandersheim, DE

Key dates

Filing date	Jan 28, 2003
Grant date	Dec 11, 2007
Priority date	—
Expiry date	Jul 31, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH01J61/35
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

In order to improve the energy balance of an HID lamp, the quartz burner, preferably the inside thereof, is coated with a UV reflecting layer system by alternatingly applying amorphous thin layers made at least of titanium oxide and silicon oxide having the respective general stoichiometry TiOy and SiOx by means of a plasma impulse chemical vapor deposition (PICVD) method at a high power density and increased substrate temperatures ranging from 100° to 400° C., using small growth rates ranging from 1 nm/sec to 100 nm/sec so as to form an interference layer system having a thickness of less than 1200 nm and a minimized UV-active defective spot rate ranging from 0.1 to 1 percent.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.