GB615553A - Improvements in or relating to devices for focusing an electron beam - Google Patents

Improvements in or relating to devices for focusing an electron beam

Info

Publication number
GB615553A
GB615553A GB613846A GB613846A GB615553A GB 615553 A GB615553 A GB 615553A GB 613846 A GB613846 A GB 613846A GB 613846 A GB613846 A GB 613846A GB 615553 A GB615553 A GB 615553A
Authority
GB
United Kingdom
Prior art keywords
plate
ring
screws
sleeve
supported
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
GB613846A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHARLES ERNEST LOCK
Kolster Brandes Ltd
Original Assignee
CHARLES ERNEST LOCK
Kolster Brandes Ltd
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
Priority to BE470596D priority Critical patent/BE470596A/xx
Application filed by CHARLES ERNEST LOCK, Kolster Brandes Ltd filed Critical CHARLES ERNEST LOCK
Priority to GB613846A priority patent/GB615553A/en
Priority to FR939447D priority patent/FR939447A/en
Priority to ES176695A priority patent/ES176695A1/en
Publication of GB615553A publication Critical patent/GB615553A/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
    • H01J29/54—Arrangements for centring ray or beam
    • 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
    • H01J29/64—Magnetic lenses
    • H01J29/68—Magnetic lenses using permanent magnets only

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

615,553. Magnets. KOLSTER-BRANDES Ltd., and LOCK, C. E. Feb. 27, 1946, No. 6138. [Class 35] [Also in Group XL (a)] An adjustable focusing device for a cathoderay tube consists of an annular permanent magnet 1 clamped between front and back plates 2 and 3 of magnetizable material by means of screws 4 (Fig. 2) of non-magnetic material, e.g. brass, and a sleeve 6 of magnetizable material provided with a knurled flange 7, screwed through the centre of the back plate 3, forming together with the front plate 2 the polepieces of the magnet. The sleeve is locked in position by means such as a spring 8. The device is supported by a resilient e.g. rubber ring 11 (Fig. 1) supported by a fixed plate 14. The ring is secured to the plate by means such as three mushroom-like projections 13 whose heads are forced through corresponding holes in the plate. Screws 15 extend through both ring and plate into threaded holes in the front plate 2, whereby the focus shift can be adjusted. The device is mounted on the neck 20 of the cathode-ray tube by a rubber bush 10. Specification 459,860 is referred to.
GB613846A 1946-02-27 1946-02-27 Improvements in or relating to devices for focusing an electron beam Expired GB615553A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE470596D BE470596A (en) 1946-02-27
GB613846A GB615553A (en) 1946-02-27 1946-02-27 Improvements in or relating to devices for focusing an electron beam
FR939447D FR939447A (en) 1946-02-27 1946-12-20 Device for focusing an electron beam
ES176695A ES176695A1 (en) 1946-02-27 1947-02-26 IMPROVEMENTS IN THE MANUFACTURE OF MOLDED OBJECTS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB613846A GB615553A (en) 1946-02-27 1946-02-27 Improvements in or relating to devices for focusing an electron beam

Publications (1)

Publication Number Publication Date
GB615553A true GB615553A (en) 1949-01-07

Family

ID=9809118

Family Applications (1)

Application Number Title Priority Date Filing Date
GB613846A Expired GB615553A (en) 1946-02-27 1946-02-27 Improvements in or relating to devices for focusing an electron beam

Country Status (4)

Country Link
BE (1) BE470596A (en)
ES (1) ES176695A1 (en)
FR (1) FR939447A (en)
GB (1) GB615553A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533687A (en) * 1949-05-27 1950-12-12 Quam Nichols Company Magnetic focusing device
US2533689A (en) * 1950-06-28 1950-12-12 Quam Nichols Company Magnetic focusing device
US2533688A (en) * 1950-01-31 1950-12-12 Quam Nichols Company Focusing device
US2568668A (en) * 1950-08-18 1951-09-18 Best Mfg Co Inc Cathode-ray tube focusing device of the permanent magnet type
US2580606A (en) * 1951-03-21 1952-01-01 Best Mfg Company Inc Cathode-ray tube focusing device
US2581657A (en) * 1950-07-26 1952-01-08 Myron R Heppner Focusing and centering device for cathode-ray tubes
US2592185A (en) * 1950-12-09 1952-04-08 Quam Nichols Company Focusing device
US2594099A (en) * 1950-04-22 1952-04-22 Ite Circuit Breaker Ltd Focusing coil for cathode-ray tubes
US2606301A (en) * 1949-02-24 1952-08-05 Pye Ltd Magnetic focusing device for cathode-ray tubes
US2623095A (en) * 1949-09-14 1952-12-23 Pye Ltd Suspension arrangement for cathode-ray tubes
DE947253C (en) * 1950-05-04 1956-08-16 Emi Ltd Cathode ray tubes with a magnetic focusing system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2606301A (en) * 1949-02-24 1952-08-05 Pye Ltd Magnetic focusing device for cathode-ray tubes
US2533687A (en) * 1949-05-27 1950-12-12 Quam Nichols Company Magnetic focusing device
US2623095A (en) * 1949-09-14 1952-12-23 Pye Ltd Suspension arrangement for cathode-ray tubes
US2533688A (en) * 1950-01-31 1950-12-12 Quam Nichols Company Focusing device
US2594099A (en) * 1950-04-22 1952-04-22 Ite Circuit Breaker Ltd Focusing coil for cathode-ray tubes
DE947253C (en) * 1950-05-04 1956-08-16 Emi Ltd Cathode ray tubes with a magnetic focusing system
US2533689A (en) * 1950-06-28 1950-12-12 Quam Nichols Company Magnetic focusing device
US2581657A (en) * 1950-07-26 1952-01-08 Myron R Heppner Focusing and centering device for cathode-ray tubes
US2568668A (en) * 1950-08-18 1951-09-18 Best Mfg Co Inc Cathode-ray tube focusing device of the permanent magnet type
US2592185A (en) * 1950-12-09 1952-04-08 Quam Nichols Company Focusing device
US2580606A (en) * 1951-03-21 1952-01-01 Best Mfg Company Inc Cathode-ray tube focusing device

Also Published As

Publication number Publication date
ES176695A1 (en) 1947-06-01
BE470596A (en)
FR939447A (en) 1948-11-15

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