Title:
DISCHARGE LAMP OPERATION DEVICE AND PROJECTOR
Document Type and Number:
WIPO Patent Application WO/2005/081589
Kind Code:
A1
Abstract:
A DC-DC converter (111) having a switching element (Q11) changes the power supply of a high-luminance discharge lamp (DL1). The ON/OFF of the switching element (Q11) is controlled by a control circuit (13). The control circuit (13) controls the ON/OFF state of the switching element (Q11) by the constant lamp power control when the lamp is stably lit. The control circuit (13) controls the ON/OFF state of the switching element (Q11) so that a lamp power greater than the lamp power by the constant power control is supplied to the lamp according to the high power control during the lamp lit period. Thus, it is possible to appropriately maintain the temperature of the lamp electrode and in the bulb and suppress generation of flicker and deterioration of the electrode by a simple control.
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Inventors:
Watanabe, Koji c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Konishi, Hirofumi c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Hasegawa, Junichi c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Nakada, Katsuyoshi c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Sasaki, Toshiaki c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Konishi, Hirofumi c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Hasegawa, Junichi c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Nakada, Katsuyoshi c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Sasaki, Toshiaki c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Application Number:
PCT/JP2004/012973
Publication Date:
September 01, 2005
Filing Date:
September 07, 2004
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS, LTD. (1048, Oaza-Kadoma Kadoma-shi, Osaka 86, 57186, JP)
Watanabe, Koji c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Konishi, Hirofumi c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Hasegawa, Junichi c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Nakada, Katsuyoshi c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Sasaki, Toshiaki c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Watanabe, Koji c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Konishi, Hirofumi c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Hasegawa, Junichi c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Nakada, Katsuyoshi c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
Sasaki, Toshiaki c/o Matsushita Electric Works Ltd. (1048, Oaza-Kadom, Kadoma-shi Osaka 86, 57186, JP)
International Classes:
H05B41/288; (IPC1-7): H05B41/24; H05B41/288; G03B21/14
Attorney, Agent or Firm:
Nishikawa, Yoshikiyo (Hokuto Patent Attorneys Office, Umeda-Daiichiseimei Bldg. 5F 12-17, Umeda
1-chome, Kita-k, Osaka-shi Osaka 01, 53000, JP)
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