[go: up one dir, main page]

GB657234A - Improvements in or relating to the focusing and positioning of the beam of a cathode-ray tube - Google Patents

Improvements in or relating to the focusing and positioning of the beam of a cathode-ray tube

Info

Publication number
GB657234A
GB657234A GB507349A GB507349A GB657234A GB 657234 A GB657234 A GB 657234A GB 507349 A GB507349 A GB 507349A GB 507349 A GB507349 A GB 507349A GB 657234 A GB657234 A GB 657234A
Authority
GB
United Kingdom
Prior art keywords
flange
plate
cathode
polepiece
magnet
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
GB507349A
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.)
GERALD AUBREY BARDEN
Harman Motive Ltd
Original Assignee
GERALD AUBREY BARDEN
Electro Acoustic Industries 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 NL676713697A priority Critical patent/NL147885B/en
Priority to BE490180D priority patent/BE490180A/xx
Application filed by GERALD AUBREY BARDEN, Electro Acoustic Industries Ltd filed Critical GERALD AUBREY BARDEN
Priority to GB507349A priority patent/GB657234A/en
Priority to DEP4280A priority patent/DE970363C/en
Publication of GB657234A publication Critical patent/GB657234A/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

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

657,234. Cathode-ray tubes. ELECTRO ACOUSTIC INDUSTRIES, Ltd., and BARDEN, G. A. Feb. 24, 1949, No. 5073. [Class 39 (i)] In a device for adjusting the magnetic gap between soft iron polepieces on a cylindrical magnet surrounding the neck of a cathode-ray tube, three screws cooperate with a flange on a tubular polepiece and a fixed plate on the magnet assembly. In the embodiment shown, the magnet 1 has polepieces in the form of plates 2, 3 having apertures 4, 5, respectively, the latter one being larger to accommodate the tubular polepiece 6 between which and the polepiece 2 is the adjustable magnet gap 11. The flange 7 on pole-piece 6 is triangular and in the case shown carries three captive nuts 9 engaging studs 10 on plate 3. Alternatively screws may engage freely plate 3 or the flange 7 and engage threaded holes in the flange or the plate, tension or compression springs being located between the plate and flange. Further, screws having heads captive on the flange may engage threaded holes in plate 3. The above construction may be used with a device for separately varying the gap as a whole comprising a tubular member having slots or grooves co-operating with a pin or pins or vice versa, the adjustment being obtained by rotating the member.
GB507349A 1949-02-24 1949-02-24 Improvements in or relating to the focusing and positioning of the beam of a cathode-ray tube Expired GB657234A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL676713697A NL147885B (en) 1949-02-24 DRY CELL.
BE490180D BE490180A (en) 1949-02-24
GB507349A GB657234A (en) 1949-02-24 1949-02-24 Improvements in or relating to the focusing and positioning of the beam of a cathode-ray tube
DEP4280A DE970363C (en) 1949-02-24 1950-10-03 Permanent magnetic focusing device for the electron beam from cathode ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB507349A GB657234A (en) 1949-02-24 1949-02-24 Improvements in or relating to the focusing and positioning of the beam of a cathode-ray tube

Publications (1)

Publication Number Publication Date
GB657234A true GB657234A (en) 1951-09-12

Family

ID=9789253

Family Applications (1)

Application Number Title Priority Date Filing Date
GB507349A Expired GB657234A (en) 1949-02-24 1949-02-24 Improvements in or relating to the focusing and positioning of the beam of a cathode-ray tube

Country Status (4)

Country Link
BE (1) BE490180A (en)
DE (1) DE970363C (en)
GB (1) GB657234A (en)
NL (1) NL147885B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2785348A (en) * 1954-06-03 1957-03-12 Philips Corp Adjusting device for a magnetic electron lens

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE424327A (en) * 1936-10-30
DE973258C (en) * 1938-03-08 1959-12-31 Siemens Ag Magnetic pole shoe lens with a small focal length for electron-optical enlargements in electron microscopes
GB576369A (en) * 1943-03-31 1946-04-01 British Thomson Houston Co Ltd Improvements in and relating to electron discharge devices and lens systems therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2785348A (en) * 1954-06-03 1957-03-12 Philips Corp Adjusting device for a magnetic electron lens

Also Published As

Publication number Publication date
NL147885B (en)
DE970363C (en) 1958-09-11
BE490180A (en)

Similar Documents

Publication Publication Date Title
GB504802A (en) Improvements in or relating to permanent magnet devices for producing axially symmetrical magnetic fields
GB513895A (en) Improvements in telephone instruments
GB472165A (en) Improvements in or relating to focusing systems for electron beams
GB605341A (en) Electron focusing apparatus
GB615553A (en) Improvements in or relating to devices for focusing an electron beam
GB657234A (en) Improvements in or relating to the focusing and positioning of the beam of a cathode-ray tube
GB691156A (en) Improvements in or relating to corpuscular ray apparatus
GB792043A (en) Improvements relating to mass spectrometers
GB517704A (en) Improvements in or relating to electron microscopes
US1866361A (en) Driving unit for loud-speakers
GB547728A (en) Improvements relating to electromagnetic telephone instruments
GB699739A (en) Improvements relating to cathode ray tubes
GB766158A (en) A beam generating system for cathode-ray tubes employing an ion trap
GB814892A (en) Improvements in or relating to means for shifting the electron beam of a cathode raytube
GB671957A (en) Improvements in or relating to bone conduction telephone receivers
GB577482A (en) Improvements in or relating to electromagnetic interrupters
GB455200A (en) Improvements in or relating to deflecting means for cathode-ray tubes
GB355227A (en) Improvements relating to the mounting of vibrating reeds, more particularly for use in connection with electromagnetic gramophone pick-ups, loud speakers and the like
GB694517A (en) Improvements in or relating to devices for focussing an electron beam
US2910604A (en) Cathode ray tube clamping centering device
GB535477A (en) Improvements in or relating to electromagnetic deflecting means for use with electron discharge devices
GB670020A (en) Improvements relating to permanent magnet electron lenses
GB1147449A (en) Improvements relating to arrangements for adjusting magnets
GB653134A (en) Improvements in electromagnetic step by step switch magnets
GB731978A (en) Improvements in or relating to magnetic focussing devices for cathode ray tubes