Reissue Patent
- Patent Title: Electric discharge lamp device
- Patent Title (中): 放电灯装置
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Application No.: US11699569Application Date: 2007-01-30
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Publication No.: USRE42141E1Publication Date: 2011-02-15
- Inventor: Noboru Yamamoto , Yukio Kunieda
- Applicant: Noboru Yamamoto , Yukio Kunieda
- Applicant Address: JP Kariya
- Assignee: DENSO CORPORATION
- Current Assignee: DENSO CORPORATION
- Current Assignee Address: JP Kariya
- Agency: Nixon & Vanderhye P.C.
- Priority: JP2002-065559 20020311; JP2002-372516 20021224
- Main IPC: H05B37/00
- IPC: H05B37/00
Abstract:
An electric discharge lamp device has a lighting start voltage storage circuit for storing a lamp voltage immediately after the start of lighting of a lamp, and a change detection circuit for detecting a change in the lamp voltage by subtracting the lamp voltage immediately after the start of lighting of the lamp from the lamp voltage detected currently. The electric power supplied to the lamp is controlled based upon the change in the lamp voltage.
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