US 7,576,494 B2
High voltage discharge lamp lighting method, lighting apparatus and image device using that lighting apparatus
Atuji Nakagawa, Himeji (Japan); Toshitaka Fujii, Himeji (Japan); Hisao Furukawa, Himeji (Japan); and Kouichi Odani, Himeji (Japan)
Assigned to Phoenix Electric Co., Ltd., Himeji-shi (Japan)
Appl. No. 10/596,184
PCT Filed Sep. 28, 2004, PCT No. PCT/JP2004/014155
§ 371(c)(1), (2), (4) Date Jun. 02, 2006,
PCT Pub. No. WO2005/055674, PCT Pub. Date Jun. 16, 2005.
Claims priority of application No. 2003-407385 (JP), filed on Dec. 05, 2003.
Prior Publication US 2007/0159445 A1, Jul. 12, 2007
Int. Cl. H05B 37/02 (2006.01)
U.S. Cl. 315—105  [315/106; 315/107] 13 Claims
OG exemplary drawing
 
1. A method of lighting a high pressure discharge lamp, comprising the steps of:
(a) reducing power to be supplied to electrodes of the lamp to an extent an arc discharge is not extinguished for a while (period (t2)) in a transition state of making transition from a lighted state to light off;
(b) making transition to a glow discharge;
(c) maintaining for a while (period (t3)); and
(d) cutting the power supply to the electrodes.