Patent ID: 7023144
Filing Date: 2006-04-04
Classification: H01J,H05B,Y02B

Abstract:
1. Device for operation of a high pressure discharge lamp, comprising: a super-high pressure discharge lamp having a silica glass discharge vessel in which a pair of opposed electrodes, with projections which have been formed on the their tips, are disposed with a distance between them of at most 2.0 mm, and the vessel being filled with at least 0.20 mg/mm a feed device which supplies an alternating current to the discharge vessel, wherein the feed device is adapted to supply alternating current to the super-high pressure discharge lamp with both a steady-state operating frequency and a low frequency, the steady-state operating frequency being selected from the range from 60 Hz to 1000 Hz and the low frequency being lower than the steady-state operating frequency and being in the range of from 5 Hz to 50 Hz, and wherein the feed device is adapted to insert the alternating current with the low frequency into the alternating current with the steady-state operating frequency with a time interval which has a length of equal to at least one half period and at most equal to five periods, said time interval being in the range of from 0.1 sec to 120 sec.