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    42.
    发明专利
    未知

    公开(公告)号：DE69300587D1

    公开(公告)日：1995-11-09

    申请号：DE69300587

    申请日：1993-12-07

    Applicant: RICOH KK

    Inventor： KIMURA MITSUTERU ,  HONMA MASATO

    IPC: B81B3/00 ,  H01J1/20 ,  H01J19/08 ,  H01J19/24 ,  H01J21/06 ,  H01J21/10

    Abstract: In the micro vacuum device according to the present invention, an electron emitter is formed into a thin film form on a thin film heater rising in midair by means of air bridge, or a thin film heater is formed as an electron emitter (106), and the electron emitter is provided adjacent to a gate (104) with a space (109) therebetween so that field emission of electrons is easily effected, or the electron emitter (106) is heated so that thermoelectrons are easily emitted.

    Electron tube cathode heating circuit - has series resistor ensuring constant heating power for cathode on change of resistance
    46.
    发明专利
    Electron tube cathode heating circuit - has series resistor ensuring constant heating power for cathode on change of resistance 未知

    公开(公告)号：DE2834750A1

    公开(公告)日：1980-02-14

    申请号：DE2834750

    申请日：1978-08-08

    Applicant: SIEMENS AG

    Inventor： BOHN JOSEF DIPL ING ,  LINS JUERGEN DIPL ING

    IPC: H01J1/13 ,  H01J19/04 ,  H01J19/08

    Abstract: The circuit comprises a heating voltage source and a series resistor (ST). It is intended for increased service life of the electron gun system, with sufficient electron emission. For this purpose, it is heated with a constant power output, while measuring the voltage drop at the heater (KH), as well as the heating current. The circuit forms the product of these two magnitudes, and the resistor (ST), forming a setting element in the circuit, is so controlled as to keep this product constant. Alternately the setting element can be replaced by a series resistor whose value corresponds to that of the cathode heater in operating state. The measuring signals may be supplied to both inputs of a multiplier (ML) whose output has a constant value.

    47.
    发明专利
    未知

    公开(公告)号：FR2428914A1

    公开(公告)日：1980-01-11

    申请号：FR7817620

    申请日：1978-06-13

    Applicant: THOMSON CSF

    Inventor： LECORNET JEAN-CLAUDE

    IPC: G05F1/44 ,  H01J1/13 ,  H03F1/54 ,  H03F3/24 ,  H01J19/82 ,  H01J19/08 ,  H01J21/10

    Abstract: An apparatus for heating the cathode of an electronic power tube, having a supply for delivering a heating current to the cathode, an interrupter circuit for periodically interrupting the flow of heating current to the cathode, and controls for controlling the duration of these periodic interruptions and for regulating the net amount of heating current. To achieve this, the controls include a voltage control that varies in such a way so as to bring the heating current from a value of O to Io (where Io is the correct heating current at which the tube will be in a pre-heated condition) during a first, predetermined time period, and then from a current Io to a current Im (where Im is the optimum value for the heating current when the tube is normally operating), during a second predetermined time period.

    48.
    发明专利
    未知

    公开(公告)号：FR2172354B1

    公开(公告)日：1977-12-30

    申请号：FR7305566

    申请日：1973-02-16

    Applicant: PHILIPS NV

    IPC: H01J1/15 ,  H01J1/16 ,  H01J19/08

    Abstract: In a reticulated grid cathode which has a flexible connection at one end to the conductor for the filament current present inside the cathode, the flexible connection consists of a number of thin metal strips of the same thickness. The strips constitute an approximately semi-circular arc and each consist of two strips of preferably the same thickness. In order to minimize the bending stress occurring in the strips, the diameter of the arc formed by the strips is chosen to be as large as possible relative to the radial dimensions of the cathode.

    49.
    发明专利
    未知

    公开(公告)号：DE1813991B2

    公开(公告)日：1977-08-04

    申请号：DE1813991

    申请日：1968-12-11

    IPC: H01J1/15 ,  H01J19/08

    Abstract: 1,203,707. Ceramic-metal seals. TOKYO SHIBAURA ELECTRIC CO. Ltd. 11 Dec., 1968 [11 Dec., 1967 (2)], No.58895/68. Heading B3V. [Also in Division H1] A metal strip 11 is adhesively bonded to a ceramic substrate 1, which is desirably porous in the region of the bond, by an adhesive agent which is free from material such as carbon and lead which would permeate the ceramic, for example soldering-glass containing a small amount of bentonite. After the adhesive agent is applied, the substrate and metal strip are heated for 10 minutes at 1100‹ C. in an inert atmosphere, e.g. nitrogen or argon, to complete the bond. The metal is an alloy of Ni-Fe or Fe-Co-Ni.

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