EP0233616B1 - Farbbildröhre - Google Patents

Farbbildröhre Download PDF

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Publication number
EP0233616B1
EP0233616B1 EP87102106A EP87102106A EP0233616B1 EP 0233616 B1 EP0233616 B1 EP 0233616B1 EP 87102106 A EP87102106 A EP 87102106A EP 87102106 A EP87102106 A EP 87102106A EP 0233616 B1 EP0233616 B1 EP 0233616B1
Authority
EP
European Patent Office
Prior art keywords
plates
electron beams
focusing
picture tube
focusing electrode
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 - Lifetime
Application number
EP87102106A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0233616A3 (en
EP0233616A2 (de
Inventor
Bernhard Dr. Lau
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.)
Panasonic Holdings Corp
Original Assignee
Nokia Unterhaltungselektronik Deutschland GmbH
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 Nokia Unterhaltungselektronik Deutschland GmbH filed Critical Nokia Unterhaltungselektronik Deutschland GmbH
Publication of EP0233616A2 publication Critical patent/EP0233616A2/de
Publication of EP0233616A3 publication Critical patent/EP0233616A3/de
Application granted granted Critical
Publication of EP0233616B1 publication Critical patent/EP0233616B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H01J29/503—Three or more guns, the axes of which lay in a common plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/4844—Electron guns characterised by beam passing apertures or combinations
    • H01J2229/4848—Aperture shape as viewed along beam axis
    • H01J2229/4858—Aperture shape as viewed along beam axis parallelogram
    • H01J2229/4865—Aperture shape as viewed along beam axis parallelogram rectangle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/4844—Electron guns characterised by beam passing apertures or combinations
    • H01J2229/4848—Aperture shape as viewed along beam axis
    • H01J2229/4872—Aperture shape as viewed along beam axis circular

Definitions

  • a color picture tube with an inline beam system is known in which plates are attached to a focusing electrode on both sides of the beam plane.
  • This pair of parallel plates extends towards the screen and is used to compensate for the elliptical beam spot distortions caused by the deflection field, which deteriorate the sharpness of the displayed image. It is attached to the focusing electrode closest to the screen.
  • plates can also be arranged on a focusing electrode adjacent to the first-mentioned focusing electrode on both sides of the beams in the direction of the last focusing electrode. These plates are mounted rotated by 90 degrees compared to the first parallel plate pair.
  • the inline blasting system 14 has a pressed glass plate 20, in which contact pins 21 are melted.
  • the contact pins 21 are conductively connected to the electrodes of the inline beam system 14 (not shown).
  • Grid electrodes 23, 24, focusing electrodes 25, 26 and a convergence pot 27 adjoin this.
  • Cathodes 22 are arranged within the grid electrode 23 and are shown only schematically and in broken lines.
  • the first grid electrode 23 is also called the control grid and the second grid electrode 24 is also called the screen grid.
  • the cathode together with the control and shield grids is called a triode lens.
  • the focusing electrodes 25, 26 form a focusing lens.
  • the individual parts of the inline blasting system 14 are held together by two glass rods 28.
  • the focusing electrode 25 consists of 4 cup-shaped electrodes 25.1 to 25.4, of which two electrodes are connected to each other with their free edge and thereby form a pot-shaped electrode.
  • all electrodes of the inline beam system 14 three openings are arranged in a row, through which the electron beams generated by the three cathodes 22 can step through.
  • three beams 1, 2, 3 are generated in the inline beam system, which land on the luminous layer of the screen 11.
  • the inline beam system is given a corresponding astigmatism. This is caused by a slit diaphragm in the grid electrode 24 of the triode lens and by plates on both sides of the beam plane or on both sides of the beams in the focusing electrode or electrodes.
  • the focusing electrode 26 is shown in a plan view, which has a cup-shaped shape.
  • the bottom of the focusing electrode 26 there are three openings 30 lying in a row, through which the electron beams 1, 2 and 3 pass.
  • two opposing plates 31 are fastened, each having three parts 33 with an arcuate course. These arcuate parts 33 protrude into the openings 30.
  • the plates 31 can also each consist of three individual arcuate parts 33.
  • the arcuate course of the parts 33 corresponds to an arc.
  • the course of the parts 33 can also be elliptical or parabolic or have a similarly curved shape.
  • the distance w1 between the opposite vertices of the parts 33 which protrude into the central opening is less than the distance w2 between the opposite vertices of the parts 33 for the outer openings 30.
  • the vertices of the parts 33 are for the outer openings not on the center line of the outer openings 30.
  • S the distance between the center points of the openings 30 from one another.
  • the distance between the vertices of the outer parts 33 from the central vertex in the plate 31 is denoted by s1. It can clearly be seen that the value s 1 is smaller than the value S. This measure makes it possible to influence the angle which the outer electron beams 1, 3 make in relation to the central electron beam 2 in order to achieve static convergence.
  • FIG. 4 shows the focusing electrode 26 in a section along the line IV / IV in FIG. 3.
  • the Openings 30 in the bottom of the focusing electrode 26 consist of passages, the height of which can be different for the individual openings.
  • the plates 31 are arranged at a certain distance above the inner edge of the passages and can be fastened to the wall 32 of the focusing electrode 26, for example by welding spots 34.
  • the distance from the bottom of the focusing electrode 26 to the lower edge of the parts 33 of the plates 31 projecting into the openings 30 is denoted by d.
  • the distance d 1 for the part 33 projecting into the central opening 30 is greater than the corresponding distances d 2 of the outer parts 33 from the bottom of the focusing electrode 26.
  • the astigmatism of the focusing electrode can be influenced by varying the distance d. It is possible to individually measure the distances d between the different parts 33 from the bottom of the focusing electrode in order to optimally adjust the astigmatism for each individual electron beam.
  • the height of the parts 33 of the plates 31 is denoted by b.
  • the astigmatism of the focusing electrode can also be changed by varying this height b.
  • the height b2 of the outer parts 33 is greater than the height b1 of the inner telescope 33.
  • the focusing electrode 25 is composed of several electrodes 25.1 to 25.4. 5 shows the electrode 25.4, for example, in order to explain how the plates in the case of the focusing electrode 25 must be arranged.
  • the plates 31 arranged on both sides of the electron beams run perpendicular to the longitudinal axis of the focusing electrode.
  • the distance between the respective opposite plates 31 is denoted by w and can be selected individually for each pair of plates in order to adjust the astigmatism.
  • w The distance between the respective opposite plates 31
  • FIG. 6 shows a section along the line VI / VI in FIG. 5. From this representation it can be seen that the plates 31 are arranged at a distance d 1 or d 2 from the bottom of the electrode 25.4. In this embodiment too, it is possible to select the distance d individually for each pair of plates. It can be seen that the distance d 1 is greater than the distance d 2.
  • the plates 31 can be obtained by punching out rags from a single flat part 35.
  • the part 35 is fastened to the wall of the cup-shaped electrode 25.4, for example by welding.
  • FIG. 7 shows the top view of the focusing electrode 26, in which the plates 31 projecting into the openings 30 were produced as in the exemplary embodiment according to FIG. 6.
  • the plates 31 run parallel to the longitudinal axis of the focusing electrode 26 and are at a distance of w 1 or w 2 from one another.
  • the astigmatism can be adjusted by changing the distance between the opposing plates 31.
  • the difference between the exemplary embodiment according to FIGS. 5 and 6 and the exemplary embodiment according to FIG. 7 is that the astigmatism generated by them has a different sign.
  • the attachment of the plates 31 in the focusing electrode 26 or in the focusing electrode 25 also results in a different sign of the astigmatism they produce.
  • the plates 31 described influence not only the astigmatism of the focusing lens, but also the other lens errors, ie the opening error and the other higher-order errors. This influence is different for each of the described embodiments.
  • the higher order errors are mainly noticeable at the edge of the picture. These can be minimized by a suitable combination of the plates on the electrodes of the focusing lens. For example, the correction is divided between the two Focusing electrodes or the impression of excessive astigmatism on one of the two focusing electrodes with partial compensation on the other focusing electrode possible.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
EP87102106A 1986-02-19 1987-02-14 Farbbildröhre Expired - Lifetime EP0233616B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863605247 DE3605247A1 (de) 1986-02-19 1986-02-19 Farbbildroehre
DE3605247 1986-02-19

Publications (3)

Publication Number Publication Date
EP0233616A2 EP0233616A2 (de) 1987-08-26
EP0233616A3 EP0233616A3 (en) 1988-10-26
EP0233616B1 true EP0233616B1 (de) 1991-06-26

Family

ID=6294441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87102106A Expired - Lifetime EP0233616B1 (de) 1986-02-19 1987-02-14 Farbbildröhre

Country Status (5)

Country Link
US (1) US4843278A (enrdf_load_stackoverflow)
EP (1) EP0233616B1 (enrdf_load_stackoverflow)
JP (1) JPS62193044A (enrdf_load_stackoverflow)
CA (1) CA1273986A (enrdf_load_stackoverflow)
DE (2) DE3605247A1 (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR910009635B1 (ko) * 1989-03-09 1991-11-23 삼성전관 주식회사 다이나믹 포커스 전자총
KR910005220Y1 (ko) * 1989-06-10 1991-07-22 삼성전관 주식회사 다이나믹 포커스 전자총
US5731657A (en) * 1992-04-21 1998-03-24 Hitachi, Ltd. Electron gun with cylindrical electrodes arrangement
US6411026B2 (en) 1993-04-21 2002-06-25 Hitachi, Ltd. Color cathode ray tube
JPH08190877A (ja) 1995-01-09 1996-07-23 Hitachi Ltd 陰極線管

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2898493A (en) * 1956-05-31 1959-08-04 Sylvania Electric Prod Method and apparatus for controlling electron beams
US4086513A (en) * 1975-03-03 1978-04-25 Rca Corporation Plural gun cathode ray tube having parallel plates adjacent grid apertures
JPS5525166Y2 (enrdf_load_stackoverflow) * 1977-04-27 1980-06-17
DE3003197A1 (de) * 1980-01-30 1981-08-06 Standard Elektrik Lorenz Ag, 7000 Stuttgart Vorrichtung zum einstellen der elektronenstrahlen einer farbbildroehre
US4412149A (en) * 1981-09-21 1983-10-25 North American Philips Consumer Electronics Corp. CRT Focusing electrode structure
JPS58133743A (ja) * 1982-02-03 1983-08-09 Hitachi Ltd カラ−ブラウン管用電子銃
JPS58216342A (ja) * 1982-06-09 1983-12-16 Nec Corp カラ−受像管用電子銃
JPS59127346A (ja) * 1983-01-10 1984-07-23 Hitachi Ltd カラ−受像管電子銃
US4517488A (en) * 1983-04-14 1985-05-14 North American Philips Consumer Electronics Corp. In-line electron gun structure for color cathode ray tube having lensing electrodes with tapered apertures and beam spot-shaping inserts
JPS60189144A (ja) * 1984-03-07 1985-09-26 Nec Corp インライン一体化電子銃構体

Also Published As

Publication number Publication date
US4843278A (en) 1989-06-27
DE3770951D1 (de) 1991-08-01
DE3605247A1 (de) 1987-08-20
EP0233616A3 (en) 1988-10-26
EP0233616A2 (de) 1987-08-26
JPH0578896B2 (enrdf_load_stackoverflow) 1993-10-29
JPS62193044A (ja) 1987-08-24
CA1273986A (en) 1990-09-11

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