Electron gun and manufacturing method therefor

    公开(公告)号:US11437214B2

    公开(公告)日:2022-09-06

    申请号:US17078598

    申请日:2020-10-23

    摘要: An electron gun comprising a cathode having an electron emitting surface and whose planar shape is circular, a heater to increase the temperature of the cathode, and an anode to apply a positive electric potential relative to the cathode to extract electrons in a predetermined direction is provided. The cathode comprises a through hole at a central portion thereof along a central axis of the cathode, and either the cathode comprises a no-emitting layer at at least one of an opening edge on the electron emitting surface side of the through hole and an inner surface of the through hole, or the opening edge on the electron emitting surface side of the through hole is a chamfered C surface or a chamfered R surface.

    ELECTRON GUN AND MANUFACTURING METHOD THEREFOR

    公开(公告)号:US20210125805A1

    公开(公告)日:2021-04-29

    申请号:US17078598

    申请日:2020-10-23

    IPC分类号: H01J29/48 H01J29/04 H01J9/04

    摘要: An electron gun comprising a cathode having an electron emitting surface and whose planar shape is circular, a heater to increase the temperature of the cathode, and an anode to apply a positive electric potential relative to the cathode to extract electrons in a predetermined direction is provided. The cathode comprises a through hole at a central portion thereof along a central axis of the cathode, and either the cathode comprises a no-emitting layer at at least one of an opening edge on the electron emitting surface side of the through hole and an inner surface of the through hole, or the opening edge on the electron emitting surface side of the through hole is a chamfered C surface or a chamfered R surface.

    Opto-reflector
    3.
    发明授权

    公开(公告)号:US10418507B2

    公开(公告)日:2019-09-17

    申请号:US16060006

    申请日:2015-12-08

    摘要: To achieve an opto-reflector in which a distance to a detection target is shortened to be able to detect the position of the closer detection target, and thereby contributing to the reduction of the arrangement space. The opto-reflector (10) includes a plate-shaped substrate (11); a light emitting element (13) and a light receiving element (14) mounted on the substrate (11); light transmitting resin layer (12) which seals the light emitting element (13) and the light receiving element (14); and a light shielding portion (21) provided between the light emitting element (13) and the light receiving element (14). The light shielding portion (21) is formed at a height such that a part of light beam can be directly transferred between the light emitting element (13) and the light receiving element (14) via the light transmitting resin layer (12).

    CONSTANT-VOLTAGE POWER SUPPLY CIRCUIT
    6.
    发明申请

    公开(公告)号:US20180307260A1

    公开(公告)日:2018-10-25

    申请号:US15959649

    申请日:2018-04-23

    发明人: Toshiyuki NAGAI

    摘要: According to one embodiment, a constant-voltage power supply circuit includes: an error amplifier including an inverting input terminal and a noninverting input terminal, a reference voltage source connected with the inverting input terminal of the error amplifier, an output transistor, the transistor having a source connected with a power supply terminal, a drain connected with a circuit output terminal, and a gate connected with an output terminal of the error amplifier, and an output voltage detecting circuit, the circuit being connected between the circuit output terminal and a power supply terminal, detecting voltage of the circuit output terminal to apply the detected voltage to the noninverting input terminal of the error amplifier. The constant-voltage power supply circuit further includes a positive feedback circuit connected between the output terminal of the error amplifier and the gate of the output transistor.