Patent Number: 6,670,780

Title: Method for operating high-pressure discharge lamp, lighting apparatus, and high-pressure discharge lamp apparatus

Abstract: Disclosed is a method for operating a high-pressure discharge lamp, a lighting apparatus, and a high-pressure discharge lamp apparatus each capable of operating the lamp at a power lower than the rated power without imposing excessive burden on the lighting circuit. To this end, when a detected lamp voltage (Vla) is below a predetermined level (S102: No), the current is supplied at a lower frequency than the rated frequency for a predetermined time period (S103 and S104 ).

Inventors: Ono; Shunsuke (Takatsuki, JP), Yamamoto; Masahiro (Takatsuki, JP), Ozasa; Minoru (Kyoto, JP), Yoshida; Masato (Takatsuki, JP)

Assignee: Matsushita Electric Industrial Co., Ltd.

International Classification: H05B 41/292 (20060101); H05B 41/39 (20060101); H05B 41/28 (20060101); H05B 41/392 (20060101); G05F 001/00 ()

Expiration Date: 12/30/2020