US3702950A - Electrostatic focussing-type television picture tube utilizing a plurality of metal disks - Google Patents
Electrostatic focussing-type television picture tube utilizing a plurality of metal disks Download PDFInfo
- Publication number
- US3702950A US3702950A US29519A US3702950DA US3702950A US 3702950 A US3702950 A US 3702950A US 29519 A US29519 A US 29519A US 3702950D A US3702950D A US 3702950DA US 3702950 A US3702950 A US 3702950A
- Authority
- US
- United States
- Prior art keywords
- disks
- picture tube
- electric field
- periodic electric
- group
- 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
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- 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
- H01J29/622—Electrostatic lenses producing fields exhibiting symmetry of revolution
- H01J29/624—Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun
Definitions
- ABSTRACT [30] Foreign Application Priority Data An electrostatic focussing-type television picture tube 7 V wherein a plurality of ring-shaped metal plates are April 21, 1969 Japan ..44/34362 successively coaxiauy stacked to form an electrode sembly with the plates being separated, a relatively g "315/31 small space between adjacent plates.
- This electrode assembly is placed between a first accelerating elec- [58] Field of 13/79 3 1 F trode and a screen, whereby a periodic electric field is produced by the electrode assembly to thereby pro- [56]
- References Cited vide a lens effect of a main lens which is apparently a unitary system and which is moreover substantially UNITED STATES PATENTS free of on- 2,884,559 4/1959 Cooper et al ..3 15/31 TV 3 Claims, 5 Drawing Figures /0 f A 1 &
- the picture tube according to the present invention also incorporates an electrostatic focusing lens system 0 periodic electric field type in which the arrangement of electrodes is a simple one comprising a plurality of ring-shaped metal plates successively stacked with each plate being separated from the succeeding one by a relatively small space, and furthermore the individual lens units providing a periodic electric field interferes with one another so that apparently they act as a unitary main lens system to exert a focusing action on the electron beam.
- the lens effect can be readily adjusted by selecting the diameters of central apertures of the respective ring-shaped metal plates so as to differ from one another.
- FIG. 1 shows a local side cross section of a picture tube embodying the present invention
- FIG. 2 shows an enlarged side cross section of the main lens system incorporated in the picture tube of FIG. 1;
- FIG. 3 shows an example of the periodic electric field produced by the main lens system of FIG. 2;
- FIG. 4 shows local side cross section of another picture tube embodying the present invention.
- FIG. 5 shows the enlarged side cross section of the main lens system incorporated in the picture tube of FIG. 4.
- a glass bulb 1 is provided with a cathode 2, a cup-shaped control grid 3, a first acceleratingelectrode 4, a periodic electric fieldtype electrostatic focusing system 5 and a fluorescent screen 6 which are sealed in this arrangement in the inside of the glass bulb 1.
- the periodic dlectric field electric focusing system 5 comprises a plurality of ringshaped metal disks 8 each thereof having a circular aperture 7 through which an electron beam is passed and, as shown in FIG. 2, the plates 8 are arranged in a stacked form in the direction of the electron beam path with the disks being spaced away from one another by a distance d.
- the radius of the aperture 7 is r and the radius of the metal disks 8 is r and the thickness of the metal disks 8 may be about 0.8 mm or smaller.
- the metal disks 8 which are six in all, for example, the metal disks of odd orders and those of even orders are connected to bus bars 9 and 10, respectively, with a group of the odd-ordered metal disks A, C and E being connected to a power source E and a group of the even-ordered metal disks B, D and F to a power source E
- Potential V of the power source E and potential V of the power source E are so chosen that there is a relation V V 0.2 V and the value of V may be arbitrarily selected to be between 5 KV and 30 KV.
- a conductive film 11 disposed to extend from the neck portion of the bulb to the internal surface area of its funnel portion is electrically connected to the last electrode F of the focusing system 5.
- the focusing effect on the electron beam by the focusing system 5 will be greater as the value of V V (V V )/3 increases, and this focusing effect will also be greater as the ratio of the distance d to the radius r of the aperture 7 becomes larger. However if the ratio r d has an excessively large value, it will give rise to a problem of aberration within the focusing system 5.
- both the aperture radii of the metal disks in the odd-ordered group and the metal disks in the even-ordered group are represented by the same r they may assume different values provided that the previously stated conditions are satisfied.
- the aperture radius of respective metal disks A, C, E and G' of an odd-ordered group is r;
- that of metal disks B D and F of an even-ordered group is r,
- the values of these radii are so chosen that there is a relation r r
- a relation V V with respect to potential V of a power source E and potential V of a power source E in addition to a periodic electric field effect due to the relation V V a periodic electric field effect owing to the relation r r synergetically acts to thereby exert an improved focusing action on the electron beam.
- numeral designates the focusing system.
- V may assume any value between 5 KV and 30 KV.
- a periodic electric fieldtype lens system which comprises at least five metal disks having circular apertures and being axially aligned in sequential order from a first accelerating electrode and along an electron beam path between said first accelerating electrode and a fluorescent screen, the group of disks of odd order being at one potential and the group of disks of even order being at another potential so as to form a periodic electric field along said electron beam path, the improvement in that the apertures of the disks of each said group have the same diameter, the aperture radius r of said disks and the distance d between adjacent disks meet the condition 2r; g d, whereby said disks constitute a unitary main focusing lens system under said periodic electric field to cause electron beams passing through said first accelerating electrode to focus on said fluorescent screen.
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- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP44034362A JPS4818674B1 (fi) | 1969-04-24 | 1969-04-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3702950A true US3702950A (en) | 1972-11-14 |
Family
ID=12412038
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US29519A Expired - Lifetime US3702950A (en) | 1969-04-24 | 1970-04-17 | Electrostatic focussing-type television picture tube utilizing a plurality of metal disks |
Country Status (2)
Country | Link |
---|---|
US (1) | US3702950A (fi) |
JP (1) | JPS4818674B1 (fi) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2534912A1 (de) * | 1974-08-02 | 1976-02-19 | Zenith Radio Corp | Fokussierlinsenanordnung fuer den elektronenstrahl einer kathodenstrahlroehre |
US4253041A (en) * | 1979-08-16 | 1981-02-24 | Zenith Radio Corporation | Extended field electron gun having a synthesized axial potential |
US4701677A (en) * | 1984-07-30 | 1987-10-20 | Matsushita Electronics Corporation | Color cathode ray tube apparatus |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53103580U (fi) * | 1977-01-27 | 1978-08-21 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD74232A (fi) * | ||||
US2070319A (en) * | 1931-05-30 | 1937-02-09 | Siemens Ag | Apparatus for influencing the character of electron rays |
US2548870A (en) * | 1949-10-17 | 1951-04-17 | Jr Walter L Colterjohn | Point projection ion microscope |
US2884559A (en) * | 1956-09-07 | 1959-04-28 | Bell Telephone Labor Inc | Electron lens systems |
US3417199A (en) * | 1963-10-24 | 1968-12-17 | Sony Corp | Cathode ray device |
-
1969
- 1969-04-24 JP JP44034362A patent/JPS4818674B1/ja active Pending
-
1970
- 1970-04-17 US US29519A patent/US3702950A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD74232A (fi) * | ||||
US2070319A (en) * | 1931-05-30 | 1937-02-09 | Siemens Ag | Apparatus for influencing the character of electron rays |
US2548870A (en) * | 1949-10-17 | 1951-04-17 | Jr Walter L Colterjohn | Point projection ion microscope |
US2884559A (en) * | 1956-09-07 | 1959-04-28 | Bell Telephone Labor Inc | Electron lens systems |
US3417199A (en) * | 1963-10-24 | 1968-12-17 | Sony Corp | Cathode ray device |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2534912A1 (de) * | 1974-08-02 | 1976-02-19 | Zenith Radio Corp | Fokussierlinsenanordnung fuer den elektronenstrahl einer kathodenstrahlroehre |
US4253041A (en) * | 1979-08-16 | 1981-02-24 | Zenith Radio Corporation | Extended field electron gun having a synthesized axial potential |
US4701677A (en) * | 1984-07-30 | 1987-10-20 | Matsushita Electronics Corporation | Color cathode ray tube apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPS4818674B1 (fi) | 1973-06-07 |
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