GB1226886A - - Google Patents

Info

Publication number
GB1226886A
GB1226886A GB1226886DA GB1226886A GB 1226886 A GB1226886 A GB 1226886A GB 1226886D A GB1226886D A GB 1226886DA GB 1226886 A GB1226886 A GB 1226886A
Authority
GB
United Kingdom
Prior art keywords
target
grid
spot
gun
deflection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Publication of GB1226886A publication Critical patent/GB1226886A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/20—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/22—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information
    • H04N9/24—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information using means, integral with, or external to, the tube, for producing signal indicating instantaneous beam position
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2231/00—Cathode ray tubes or electron beam tubes
    • H01J2231/12—CRTs having luminescent screens
    • H01J2231/121—Means for indicating the position of the beam, e.g. beam indexing

Abstract

1,226,886. Colour television tubes. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 19 Dec., 1968 [22 Dec., 1967], No. 60380/68. Heading H1D. In a cathode-ray tube such as an indexing type colour television tube in which the beam is astigmatically focused as an elongated spot 13 on the target 3, Fig. 1, the undeflected beam 122, Fig. 5, is meridionally focused at a point 125 located in front of the target 103 so that the spot length does not vary rapidly with the deflection angle and does not exhibit a sharp minimum. In order that the width of the spot may be kept small on deflection of the beam, the meridional image plane of the X deflection means and the sagittal image plane of the Y deflection means coincide with the target. The electron-optical system may comprise an astigmatic focusing lens, e.g. a quadrupolar lens, or the electron gun may be astigmatic, e.g. a triode gun with the first grid electrode having an elliptical opening or a tetrode gun, Fig. 7, in which the first grid 49 has an elliptical opening 58 and a second grid 50 has a circular opening 59. The accelerating electrode 51 is formed by a spout-shaped portion of electrode 52 which forms with electrodes 53 and 54 a rotationally-symmetrical focusing lens. Suitable dimensions and voltages for the system are given.
GB1226886D 1967-12-22 1968-12-19 Expired GB1226886A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6717635A NL6717635A (en) 1967-12-22 1967-12-22

Publications (1)

Publication Number Publication Date
GB1226886A true GB1226886A (en) 1971-03-31

Family

ID=19802088

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1226886D Expired GB1226886A (en) 1967-12-22 1968-12-19

Country Status (7)

Country Link
US (1) US3524094A (en)
AT (1) AT287800B (en)
BE (1) BE725860A (en)
DE (1) DE1812023A1 (en)
FR (1) FR1601888A (en)
GB (1) GB1226886A (en)
NL (1) NL6717635A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852608A (en) * 1971-03-22 1974-12-03 Philips Corp Cathode-ray tube having an astigmatic lens element in its electron gun
NL7208728A (en) * 1971-07-28 1973-12-28
NL7203931A (en) * 1972-03-24 1973-09-26
US4399388A (en) * 1980-10-16 1983-08-16 Tokyo Shibaura Denki Kabushiki Kaisha Picture tube with an electron gun having non-circular aperture
NL8500955A (en) * 1985-04-01 1986-11-03 Philips Nv IMAGE RECORDING DEVICE AND TELEVISION ROOM TUBE.
KR970068772A (en) * 1996-03-19 1997-10-13 윤종용 Beam index tube
US6479937B2 (en) 2001-03-13 2002-11-12 Chunghwa Picture Tubes, Ltd. Multi-beam index CRT with horizontal phosphor lines
US6377003B1 (en) 2001-04-16 2002-04-23 Chungwa Picture Tubes, Ltd. Multi-beam group electron gun for beam index CRT
US6815881B2 (en) * 2002-02-11 2004-11-09 Chunghwa Picture Tubes, Ltd. Color CRT electron gun with progressively reduced electron beam passing aperture size
US6674228B2 (en) 2002-04-04 2004-01-06 Chunghwa Pictures Tubes, Ltd. Multi-layer common lens arrangement for main focus lens of multi-beam electron gun

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL110569C (en) * 1954-02-09

Also Published As

Publication number Publication date
FR1601888A (en) 1970-09-21
BE725860A (en) 1969-06-20
US3524094A (en) 1970-08-11
AT287800B (en) 1971-02-10
DE1812023A1 (en) 1969-07-31
NL6717635A (en) 1969-06-24

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees