Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

West Electric Co., Ltd.

Hisashi Dejima

Norikazu Yamamoto

Teruaki Shigeta

Nobuhiro Shimizu

Yusuke Mori

Yoko Matsubayashi

Toshiaki Murai

Masaki Hirohashi

Yasushi Ogino

Yutaka Wakimura

Shuuji Furukawa

Masaki Tanabe

Koichiro Matsuoka

A discharge tube includes a reflective film formed on an outer periphery of a cylindrical glass bulb by metal deposition. The reflective film is deposited in a range of 240&#xb0; or more in the circumferential direction, and the range being larger in a center part than at each end in the axial direction. A stroboscopic device is equipped with this discharge tube.

Discharge tube and stroboscopic device

A discharge lamp device is provided that includes a light source device including a reflective surface. In the light source, noble gas not including mercury is excited to provide stable light emission and ozone or the like is prevented from being generated. This discharge lamp device includes airtight container () in which both end sections of a glass bulb are sealed. Airtight container () is filled with a discharge medium mainly including noble gas. One end section of airtight container () includes first electrode (). Airtight container () is externally attached to insulating holder () having a square plate-like shape that includes penetration hole(s) () at one or a plurality of position(s). Holder () is fitted to second electrode () shaped to be a U-like groove so that a fixed interval between airtight container () and second electrode () is maintained. Three side faces () of holder () include protrusion () and second electrode () includes fitting hole () fitted with protrusion (). By fitting protrusion () with fitting hole (), holder () is prevented from disengaged from second electrode ().

Discharge lamp device including an airtight container filled with a noble gas

A discharge light having a light emitting tube () encapsulates a discharging medium, an inner electrode () disposed in the light emitting tube, and an outer electrode unit () fixed to the outside of the light emitting tube. The outer electrode unit has at least a plurality of outer electrodes () arranged intermittently in the axial direction of the tube and having a part abutting on the outer wall face of the light emitting tube, and a part () engaging with the light emitting tube while coupling the outer electrodes thereof integrally, wherein the engaging part clamps the light emitting tube at a part thereof thus holding the outer electrode unit around the light emitting tube. The light emitting tube is lighted by applying a voltage between the inner electrode and the outer electrode. The outer electrode can be fixed readily to the light emitting tube and the plurality of outer electrodes can be held against the light emitting tube with high accuracy.

Discharge lamp device and backlight having external electrode unit

Growing community of inventors

Kyoto, Japan

Hisashi Dejima