GB1288101A - - Google Patents

Info

Publication number
GB1288101A
GB1288101A GB3479870A GB3479870A GB1288101A GB 1288101 A GB1288101 A GB 1288101A GB 3479870 A GB3479870 A GB 3479870A GB 3479870 A GB3479870 A GB 3479870A GB 1288101 A GB1288101 A GB 1288101A
Authority
GB
United Kingdom
Prior art keywords
apertures
july
cup
arcuate
radial direction
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
GB3479870A
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 GB1288101A publication Critical patent/GB1288101A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/62—Electrostatic lenses
    • 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

Abstract

1288101 Electron lenses NIPPON ELECTRIC CO Ltd 17 July 1970 [25 July 1969] 34798/70 Heading H1D An electron lens for a triple beam colour television tube comprises third and fifth cup-shaped grid electrodes (304, 307, Fig. 3, not shown) disposed at opposite ends of a cylindrical fourth grid electrode (306), and the diaphragms 41, Fig. 4, closing the ends of the cup-shaped electrodes are provided with elongate apertures 42 extending laterally. These elongate apertures have a diverging effect in the radial direction which compensates for the excessive convergence of the whole lens in the radial direction due to spherical aberration, the magnitude of the diverging effect depending on the length/breadth ratio of the aperture. In Fig. 4 there are three rectangular apertures; in a modification, Fig. 5 (not shown), the apertures are arcuate and extend circumferentially. In a further modification, Fig. 6 (not shown), for use with coplanar beams there are two arcuate apertures disposed on opposite sides of a central circular aperture.
GB3479870A 1969-07-25 1970-07-17 Expired GB1288101A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5915069 1969-07-25

Publications (1)

Publication Number Publication Date
GB1288101A true GB1288101A (en) 1972-09-06

Family

ID=13105010

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3479870A Expired GB1288101A (en) 1969-07-25 1970-07-17

Country Status (5)

Country Link
US (1) US3678317A (en)
DE (1) DE2036479A1 (en)
FR (1) FR2055422A5 (en)
GB (1) GB1288101A (en)
NL (1) NL7011026A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4876295A (en) 1987-03-11 1989-10-24 The Dow Chemical Company Flexible thermoplastic epoxy resin and coatings prepared therefrom

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2696571A (en) * 1950-02-10 1954-12-07 Rca Corp Color kinescope
GB1195598A (en) * 1967-01-14 1970-06-17 Sony Corp Cathode Ray Tube

Also Published As

Publication number Publication date
NL7011026A (en) 1971-01-27
FR2055422A5 (en) 1971-05-07
US3678317A (en) 1972-07-18
DE2036479A1 (en) 1971-09-23

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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