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    HIGH PRESSURE METAL-VAPOUR DISCHARGE TUBE
    1.
    发明专利
    HIGH PRESSURE METAL-VAPOUR DISCHARGE TUBE 未知

    公开(公告)号：GB1280735A

    公开(公告)日：1972-07-05

    申请号：GB4087070

    申请日：1970-08-25

    Applicant: MATSUSHITA ELECTRONICS CORP

    Inventor： MIZUNO HIDEO ,  KIMURA SADAO ,  AKUTSU HIDEZO ,  YAMAZAKI HARUO ,  OKAMOTO TAKIO ,  WATARAI YOSHIAKI ,  BABA SHOICHI

    IPC: H01J61/04

    Abstract: 1280735 Metal vapour lamps MATSUSHITA ELECTRONICS CORP 25 Aug 1970 [29 Aug 1969] 40870/70 Heading H1D A high pressure metal vapour discharge lamp comprises a sealed transparent polycrystalline high density ceramic tubular enclosure 1 (e.g. alumina, beryllia, magnesia) containing a rare gas (e.g. Xe), Hg, and one or more alkali metals (e.g. Na) to form a saturated vapour pressure, and metal layers 5 in contact with the outer wall at each end to conduct heat from the hotter to the cooler parts. The layer 5 is preferably a metal of high m.p., high thermal conductivity and low vapour pressure and may be Ti, Y, Rh, Ru, Mo, Nb, Ta, W, Pt, Ir, Re or Os and may be foil such as 0À02 mm. thick Ta, formed by chemical or vapour deposition, or by sputtering. Ceramic end discs 2 may be replaced by metal end caps. The metal layers preferably do not extend beyond 5 mm. from the front tip of electrodes 6. In sputtering, the central part of the tube is covered with an insulator such as porcelain supporting a W anode, and the end parts are wound with metal foil. For chemical deposition, the end parts may be heated to 600‹ to 700‹ C. and contacted with a mixed gas of molybdenum pentachloride and hydrogen. Ceramic cement seals the enclosure, discs 2 and leadin metal tubes 3. Discs 2 are preferably the same material as the enclosure, but may be other ceramics with high thermal expansion coefficient approximating that high m.p. tubes 3 of Nb, Ta or Mo for example. Alkali vapour pressures may be 300 to 1000 torr and the coolest and highest tube temperatures may be 650‹ to 800‹ C. and 1200‹ C. respectively (e.g. Fig. 2, not shown).

    A HIGH PRESSURE METAL VAPOUR DISCHARGE LAMP
    3.
    发明专利
    A HIGH PRESSURE METAL VAPOUR DISCHARGE LAMP 未知

    公开(公告)号：GB1270195A

    公开(公告)日：1972-04-12

    申请号：GB3189170

    申请日：1970-07-01

    Applicant: MATSUSHITA ELECTRONICS CORP

    Inventor： MIZUNO HIDEO ,  KIMURA SADAO ,  AKUTSU HIDEZOH ,  OKAMOTO TAKIO ,  YAMAZAKI HARUO

    IPC: H01J61/22

    Abstract: 1,270,195. Metal vapour lamps. MATSUSHITA ELECTRONICS CORP. 1 July, 1970 [4 July, 1969], No. 31891/70. Heading H1D. A high-pressure metal-vapour discharge lamp contains sodium and a rare gas as starter gas in a transparent polycrystalline alumina ceramic tube 1, and an additional charge of Cd or Cd and Hg only, wherein the coolest temperature of the tube is maintained at 750‹ to 900‹ C. during operation. The Cd addition is stated to produce more stable characteristics and enhance the blue emission. End caps 2 and 3 may be of alumina ceramic of equal expansion coefficient to the tube 1, and sealed with a ceramic cement of oxides of Al, Mg, Ca and #. Emission electrodes 6, 7 may be tungsten coils impregnated with BaO and Xe at 20 mm. Hg pressure may be with 15 mg of Na, 30 mg. of Cd or 15 mg. of Na, 40 mg. of Cd and 20 mg. of Hg.

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