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    ELECTRON GUN HAVING A DISTRIBUTED ELECTROSTATIC LENS
    1.
    发明专利
    ELECTRON GUN HAVING A DISTRIBUTED ELECTROSTATIC LENS 未知

    公开(公告)号：CA1111487A

    公开(公告)日：1981-10-27

    申请号：CA304763

    申请日：1978-06-05

    Applicant: RCA CORP

    Inventor： BORTFELD DAVID P ,  COHEN ROGER W ,  DE WOLF DAVID A

    IPC: H01J3/02 ,  H01J29/50 ,  H01J29/62

    Abstract: ELECTRON GUN HAVING A DISTRIBUTED ELECTROSTATIC LENS A color cathode ray tube includes an electron gun having a distributed lens system which yields smaller spot sizes on a phosphor screen at intermediate and higher cathode currents when compared with prior art electrostatic lenses having similar diameters. The lens comprises first, intermediate and final accelerating and focusing electrodes, the intermediate one of which forms a substantially cylindrical electron lens element. The intermediate accelerating and focusing electrode serves to establish an essentially exponentially increasing potential distribution along the electron beam path.

    RESISTIVE LENS ELECTRON GUN WITH COMPOUND LINEAR VOLTAGE PROFILE
    3.
    发明专利
    RESISTIVE LENS ELECTRON GUN WITH COMPOUND LINEAR VOLTAGE PROFILE 未知

    公开(公告)号：CA1143775A

    公开(公告)日：1983-03-29

    申请号：CA357582

    申请日：1980-08-05

    Applicant: RCA CORP

    Inventor： WINARSKY NORMAN D ,  COHEN ROGER W ,  BORTFELD DAVID P ,  VIELAND LEON J

    IPC: H01J29/48 ,  H01J29/50 ,  H01J29/62

    Abstract: RCA 72,299 The electron gun includes a pair of electrodes between which a resistive lens structure comprising a stack of alternate apertured plates and resistive blocks is disposed. A first portion of the resistive stack is electrically paralleled with another stack of resistive blocks whereby bleeder current through the resistive lens structure results in a compound linear potential profile. The other stack of resistive blocks may comprise a second stack in the same lens structure interleaved with the apertured plates of the lens structure, or it may (as claimed herein) constitute together with a different set of apertured plates a second resistive lens structure between a different pair of electrodes of the gun.

    SIMPLIFIED RESISTIVE LENS ELECTRON GUN WITH COMPOUND LINEAR VOLTAGE PROFILE
    5.
    发明专利
    SIMPLIFIED RESISTIVE LENS ELECTRON GUN WITH COMPOUND LINEAR VOLTAGE PROFILE 未知

    公开(公告)号：CA1143774A

    公开(公告)日：1983-03-29

    申请号：CA357581

    申请日：1980-08-05

    Applicant: RCA CORP

    Inventor： BORTFELD DAVID P ,  VIELAND LEON J

    IPC: H01J29/48 ,  H01J29/50 ,  H01J29/62

    Abstract: RCA 74,243A The electron gun includes a pair of electrodes between which a resistive lens structure comprising a stack of alternate apertured plates and resistive blocks is disposed. The stack comprises a first section which has two resistive blocks between each adjacent pair of electrode plates and a second section which has one resistive block between each adjacent pair of electrode plates. The lens is thereby adapted to operate with a potential profile which comprises a compound linear slope in a 1:2 ratio.

    VARIABLE PITCH GROOVED LABEL FOR VIDEO DISC
    7.
    发明专利
    VARIABLE PITCH GROOVED LABEL FOR VIDEO DISC 未知

    公开(公告)号：CA1161954A

    公开(公告)日：1984-02-07

    申请号：CA374768

    申请日：1981-04-06

    Applicant: RCA CORP

    Inventor： JOHN GUNTER ,  HEYMAN PHILIP M ,  BORTFELD DAVID P

    IPC: G06K19/06 ,  G11B19/12 ,  G11B7/00 ,  G11B5/82

    Abstract: RCA 75,269 A video disc record suitable for use with a video disc player apparatus is provided with a label for identifying the program material stored on the surface of the record. The label is formed in a machine readable format which comprises grooves in the surface of the record. In one format whorls of a spiral groove of a first pitch are spaced alternately with whorls of a spiral groove of a second pitch. A readout apparatus comprises a light beam which is arranged to scan the grooved label and a detector which is arranged to sense the light beam reflected from the disc record surface. Light striking a grooved section of first pitch is reflected in a substantially specular direction while light striking a grooved section of second pitch is substantially scattered out of the specular direction. The detector is arranged to collect the light reflected into the specular direction.

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