GB1453293A - Cathode structures - Google Patents

Cathode structures

Info

Publication number
GB1453293A
GB1453293A GB5132273A GB5132273A GB1453293A GB 1453293 A GB1453293 A GB 1453293A GB 5132273 A GB5132273 A GB 5132273A GB 5132273 A GB5132273 A GB 5132273A GB 1453293 A GB1453293 A GB 1453293A
Authority
GB
United Kingdom
Prior art keywords
cathode
assembly
grid
distance
moved
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
GB5132273A
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.)
RCA Corp
Original Assignee
RCA Corp
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 by RCA Corp filed Critical RCA Corp
Publication of GB1453293A publication Critical patent/GB1453293A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/18—Assembling together the component parts of electrode systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2209/00—Apparatus and processes for manufacture of discharge tubes
    • H01J2209/18—Assembling together the component parts of the discharge tube
    • H01J2209/185—Machines therefor, e.g. electron gun assembling devices

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

1453293 Electron guns RCA CORPORATION 5 Nov 1973 [6 Nov 1972] 51322/73 Heading H1D A method of assembling a cathode 31 and an apertured grid 23 with their confronting surfaces a precise distance S apart, comprises positioning the surfaces a reference distance R apart, moving the cathode and grid towards each other a distance R-S and fixing the cathode and grid together. In an electron gun the method avoids relatively large changes in the screen grid cut off voltage due to arcing between the cathode and control grid caused by variations in S. An electron gun assembly 21 comprises 3 in-line guns 22a, 22b, 22c each with a cathode 31 having an emitting surface 36, control, screen, first and second accelerating and focusing grids 23, 24, 25, 26 with aligned apertures. The electrodes are fixed on two glass rods 27a, 27b. The electrodes are assembled on a "span-set" unit 38 comprising a two part carriage (39) Fig. 2 (not shown) holding assembly 20 without the cathodes, a carriage (40) holding a cathode 31, a measurement probe assembly (41) and a welding assembly (42). Carriage (39) includes front and rear members 47, (48) connected by a vernier adjuster (53). The probe assembly 41 includes distance gauges 81, 82. Gauge 81 comprises a nozzle 83 from which air impinges on a surface 37 of grid 23 and the back pressure varies according to the distance between the nozzle and the surface. The distance between gauge 82 and cathode emitter surface 35 is measured capacitatively. The carriage member 47 and cathode 31 are moved until zero readings are obtained on gauges 81, 82. The member 47 is retracted a known distance, probe assembly 41 is moved, member 47 is moved to its non-retracted position and then moved a distance X-S to accurately position the cathode in the assembly with respect to the grid. The cathode and grid are then welded together by the assembly (42) comprising 4 welding guns arranged radially about the assembly axis 44 and moved pneumatically. The assembly 20 is then moved laterally on a slide (56) to align another gun with the next cathode to be inserted. The span set unit is semi automatic. The cathode may be a dispenser type; the guns may be arranged in a delta.
GB5132273A 1972-11-06 1973-11-05 Cathode structures Expired GB1453293A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00304012A US3848301A (en) 1972-11-06 1972-11-06 Method of directly spacing a cathode-to-grid assembly for a cathode-ray tube

Publications (1)

Publication Number Publication Date
GB1453293A true GB1453293A (en) 1976-10-20

Family

ID=23174647

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5132273A Expired GB1453293A (en) 1972-11-06 1973-11-05 Cathode structures

Country Status (8)

Country Link
US (1) US3848301A (en)
JP (1) JPS5331593B2 (en)
CA (1) CA999639A (en)
DE (1) DE2355240C3 (en)
FR (1) FR2205738B1 (en)
GB (1) GB1453293A (en)
IT (1) IT996904B (en)
NL (1) NL179429C (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5143555U (en) * 1974-09-27 1976-03-31
US4170811A (en) * 1978-09-05 1979-10-16 Rca Corporation Method for coating cathode material on cathode substrate
US4176432A (en) * 1978-12-13 1979-12-04 Rca Corporation Method for establishing uniform cathode-to-grid spacing in an electron gun
DE3035970C2 (en) * 1980-09-24 1982-11-04 Standard Elektrik Lorenz Ag, 7000 Stuttgart Method for adjusting the electrode spacing in beam generation systems of cathode ray tubes
FR2612690B1 (en) * 1987-03-20 1989-05-26 Videocolor CATHODE IMPLANTATION MACHINE IN A CATHODE TUBE CANNON
FR2616268B1 (en) * 1987-06-05 1991-02-01 Videocolor CATHODE TUBE CATHODE LAYOUT MACHINE
FR2625837B1 (en) * 1988-01-13 1990-11-09 Videocolor IMPROVEMENT IN CATHODE LAYING MACHINES IN A CATHODE TUBE CANON
JPH03133023A (en) * 1989-10-16 1991-06-06 Hokuto Denshi Kogyo Kk Assembly of electron gun
US5295887A (en) * 1993-06-16 1994-03-22 Zenith Electronics Corporation K-G1 electrode spacing system for a CRT electron gun

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2872609A (en) * 1957-06-14 1959-02-03 Sylvania Electric Prod Cathode-grid spacing means
US2864935A (en) * 1957-07-01 1958-12-16 Sylvania Electric Prod Apparatus for spacing and uniting parts
SU147602A1 (en) * 1960-02-03 1961-11-30 Ю.И. Гребень The method of assembling cathode-modulator node of the cathode-ray tube
US3114199A (en) * 1962-03-16 1963-12-17 Raytheon Co Assembly apparatus
US3533147A (en) * 1968-07-19 1970-10-13 Zenith Radio Corp Cathode inserting machine and process
US3643299A (en) * 1969-06-16 1972-02-22 Rca Corp Electron beam tube and method of adjusting the electrode spacing of an electron gun therein
US3667824A (en) * 1970-08-10 1972-06-06 Tokyo Shibaura Electric Co Method for adjusting the space between cathode and first plate grid electrodes in an electron gun member

Also Published As

Publication number Publication date
NL179429C (en) 1986-09-01
FR2205738B1 (en) 1977-05-27
JPS4979666A (en) 1974-08-01
JPS5331593B2 (en) 1978-09-04
US3848301A (en) 1974-11-19
DE2355240B2 (en) 1977-07-14
DE2355240A1 (en) 1974-05-16
NL7315142A (en) 1974-05-08
IT996904B (en) 1975-12-10
FR2205738A1 (en) 1974-05-31
CA999639A (en) 1976-11-09
DE2355240C3 (en) 1978-03-09
NL179429B (en) 1986-04-01

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19931104