公开(公告)号：US09870913B2

公开(公告)日：2018-01-16

申请号：US15509944

申请日：2016-06-29

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Hiroshi Saiki ,  Shinji Kihara

IPC: H01J17/44 ,  H01J61/54 ,  H01J61/30 ,  H01J61/36 ,  G03B15/04 ,  G09F13/26 ,  G09F13/44

CPC classification number: H01J61/547 ,  G03B15/04 ,  G03B15/05 ,  G09F13/26 ,  G09F13/44 ,  H01J61/30 ,  H01J61/302 ,  H01J61/366 ,  H01J61/54

Abstract: A flash discharge tube includes tungsten pins configuring a pair of discharge electrodes, and an envelope. The envelope includes a central region, serving as an alkali-free region, which is configured with an alkali-free glass except for quartz glass. The central region becomes in a high temperature state during a firing operation of the flash discharge tube. The central region is smaller than a maximum region enclosing a gas-tight space formed by hermetically sealing the pair of the discharge electrodes and is not smaller than a minimum region enclosing an arc-discharge space formed between the tungsten pins of the pair of the discharge electrodes. The alkali-free region contains either no alkali metal component or not larger than a predetermined amount of an alkali metal component. Then, a trigger electrode is disposed in the alkali-free region. This provides the flash discharge tube featuring a stable short-interval continuous-firing operation.

公开(公告)号：US11133172B2

公开(公告)日：2021-09-28

申请号：US17251949

申请日：2019-06-21

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Shinji Kihara ,  Kazuhiro Daijo

IPC: H01J61/54 ,  H01J61/80 ,  H01J61/06

Abstract: There are provided a glass tube in which a rare gas under predetermined pressure is sealed, a cathode electrode and an anode electrode disposed in a first end portion and a second end portion of the glass tube, respectively, facing each other, and a trigger electrode including a transparent conductive film formed on an outer peripheral surface of the glass tube. The trigger electrode includes an electrode body disposed on the outer peripheral surface of the glass tube, along a tube axis direction of the glass tube, and an enlarged portion that covers at least any one of the cathode electrode and the anode electrode, and that has a circumferential width wider than a circumferential width of the electrode body. This provides a flash discharge tube capable of reducing variations in optical distribution characteristics during light emission with a small amount of light, and improving life durability during continuous emission of a large amount of light and at short intervals.