(19)
(11) EP 2 203 033 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.09.2010 Bulletin 2010/36

(43) Date of publication A2:
30.06.2010 Bulletin 2010/26

(21) Application number: 09015807.2

(22) Date of filing: 21.12.2009
(51) International Patent Classification (IPC): 
G21K 1/00(2006.01)
H05G 2/00(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated Extension States:
AL BA RS

(30) Priority: 25.12.2008 JP 2008329570

(71) Applicant: USHIO DENKI KABUSHIKI KAISHA
Tokyo 100 (JP)

(72) Inventor:
  • Yokoyama, Takuma
    Gotenba-shi Shizuoka-ken (JP)

(74) Representative: Tomerius, Isabel et al
Lang & Tomerius Patentanwälte Landsberger Strasse 300
80687 München
80687 München (DE)

   


(54) Extreme ultraviolet light source device


(57) The invention relates to an extreme ultraviolet light source device, comprising a pair of discharge electrodes (2a, 2b, 52a, 52b) arranged spaced apart from each other; a pulsed power supply means (3, 53) supplying pulsed power to said discharge electrodes (2a, 2b); a raw material supply means (7) adapted for supplying raw material (M) for generating extreme ultraviolet radiation onto said discharge electrodes (2a, 2b, 52a, 52b); an energy beam emitting means (10, 60) adapted for radiating an energy beam (LB2) to the raw material (M) on said discharge electrodes (2a, 2b, 52a, 52b) to gasify said raw material (M); a means (11, 61, 85, 95, 105) for forming a depression (MA) in the raw material (M) supplied onto said discharge electrodes (2a, 2b, 52a, 52b); and a controller (6, 56). Said controller (6, 56) is adapted to control the depression forming means (11, 61, 85, 95, 105) such that it forms a depression (MA) in the raw material (M) supplied onto the discharge electrodes (2a, 2b, 52a, 52b) before the voltage between the electrodes (2a, 2b, 52a, 52b) increases by means of the supply of pulsed power to the discharge electrodes (2a, 2b, 52a, 52b) by said pulsed power supply means (3, 53), and before the energy beam (LB2) is radiated to the raw material (M) on the electrodes (2a, 2b, 52a, 52b) by said energy beam emitting means (10, 60). The invention also relates to a process for generating EUV radiation.







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