GB2311165A - Method of manufacturing color selecting apparatus for a cathode ray tube - Google Patents
Method of manufacturing color selecting apparatus for a cathode ray tube Download PDFInfo
- Publication number
- GB2311165A GB2311165A GB9705060A GB9705060A GB2311165A GB 2311165 A GB2311165 A GB 2311165A GB 9705060 A GB9705060 A GB 9705060A GB 9705060 A GB9705060 A GB 9705060A GB 2311165 A GB2311165 A GB 2311165A
- Authority
- GB
- United Kingdom
- Prior art keywords
- color selecting
- welding
- electrode
- ray tube
- cathode ray
- 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.)
- Granted
Links
Classifications
-
- 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
- H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
- H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/06—Resistance welding; Severing by resistance heating using roller electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/07—Shadow masks
- H01J2229/0727—Aperture plate
- H01J2229/075—Beam passing apertures, e.g. geometrical arrangements
- H01J2229/0755—Beam passing apertures, e.g. geometrical arrangements characterised by aperture shape
- H01J2229/0761—Uniaxial masks having parallel slit apertures, i.e. Trinitron type
Abstract
An aperture grille 5 of a colour selection electrode is seam welded to a frame member 1am e.g. by a rotating discoid electrode 8. To prevent wrinkles being formed in the grille, which would lead to a damping wire being unable to perform its function fully, a cut out 5b is formed in a marginal portion 5a of the grille 5 to allow the welding to be started at a position P2 slightly in advance of the end of grille P1. The spacing L between P1 and P2 is preferably in the range 0-5mm. The marginal portion of the aperture grille is removed after the welding.
Description
METHOD OF MANUFACTURING COLOR SELECTING APPARATUS
FOR A CATHODE RAY TUBE
The invention relates to a method of manufacturing a color selecting apparatus for a cathode ray tube particularly to assemble a color selecting apparatus having a frame and a color selecting electrode welded together.
In a cathode ray tube, a color selecting electrode on which vertically-continuous striped thin metal slits (aperture grille) are formed is set to a frame and color display is performed by the color selecting electrode. In this cathode ray tube, three electron beams emitted from an electron gun G are deflected to scan the whole of a phosphor screen and each electron beam is interrupted by a color selecting electrode and reaches the phosphor screen only when passing through the slits of the color selecting electrode, and it is applied to the phosphor of its corresponding color.
As shown in Fig. 1, the color selecting apparatus has a structure in which a color selecting electrode 5 is set to a frame 1 set in a cathode ray tube 20.
As shown in Fig. 2, the color selecting apparatus 10 in a cathode ray tube 20 has a structure in which the color selecting electrode 5 with the striped thin metal slits is set to frame members la and ib of the frame 1 obtained by welding and joining frame members la, ib, ic, and id to each other so that they are rectangular, and a thin wire (damping wire) 9 is set to the color selecting apparatus 10 between the frame members ic and id perpendicularly intersecting the striped thin metal slits to prevent the vibration of the striped thin metal slits.
Moreover, the color selecting electrode 5 with a vertically-continuous striped slits has a marginal portion 5a to be removed in the manufacturing step at its margin.
Figures 3A to 3E are views showing a procedure for assembling the color selecting apparatus 10.
As shown in Fig. 3A, the frame 1 is held between the holder 6 with a curvature close to that of the frame members la and ib while applying a compressive force F to the frame members la and ib, the color selecting electrode 5 is mounted on a holder 6.
Then, as shown in Fig. 3B, the color selecting electrode 5 is pulled at a force f by holding it by a pressing jig 7 so that the color selecting electrode 5 which is mounted on the holder 6 does not loosen. Under the above state, the frame 1 is pressed against the color selecting electrode and thereafter, as shown in Fig. 3C, the color selecting electrode 5 is welded to the frame members la and 1b by pressurizing it with a discoid welding electrode 8 and rotating the discoid welding electrode 8 along with the frame members la and lb.
Then, as shown in Fig. 3D, the holder 6 and the pressing jig 7 are removed and the compressive force F applied to the frame members la and 1b are released.
Then, as shown in Fig. 3E, assembling of the color selecting apparatus 10 is completed by removing the marginal portion Sa of the color selecting electrode 5 jutting out of the frame 1.
Moreover, as shown in Fig. 2, a damping wire 9 is mounted to the color selecting apparatus 10 so as to perpendicularly intersect the striped thin metal slits 4 in order to prevent vibrations of the striped thin metal slits 4.
Figure 4 is a view showing the state of the color selecting electrode 5 at the start of welding between the color selecting electrode 5 and the frame 1 described in
Fig. 3C.
As shown in Fig. 4, the color selecting electrode 5 placed on a predetermined position on the frame members la and 1b is welded with the frame members la and 1b while rotating the discoid welding electrode 8 to which a depressive force W is applied. In this case, if a welding start position is set to any position of the marginal portion 5a on the color selecting electrode 5, the discoid welding electrode 8 may turn up an end of the color selecting electrode 5 nearby the welding start position.
Therefore, as shown in the circle A drawn by a dotted line, bumps are formed on the color selecting electrode 5 nearby the welding start position. The bumps on the color selecting electrode 5 produce twists and creases on the striped thin metal slits 4.
When these twists and creases are produced, the damping wire 9 does not completely contact the striped thin metal slits 4 nearby an end of the striped thin metal slits 4 in the stripe direction as shown in Fig. 6. Unless the striped thin metal slits 4 properly contacts the damping wire 9, a problem occurs that the vibration of the striped thin metal slits 4 (aperture grille vibration) cannot be prevented. Because the relative positional relation between the aperture grille and a phosphor screen is changed due to the aperture grille vibration, a problem such as a color shift occurs.
According to the present invention, there is provided a method of manufacturing a color selecting apparatus for a cathode ray tube in which a color selecting electrode having striped thin metal slits is welded on a frame, comprising the steps of: forming a plurality of the striped thin metal slits on the color selecting electrode, providing the color selecting electrode on the frame, and welding the color selecting electrode and the frame, a starting position of the welding being a predetermined distance from an end of the color selecting electrode.
If such a method of manufacturing a cathode ray tube particularly to prevent a color selecting electrode from twisting or shifting when welding and securing a color selecting electrode to the surface of a frame, there is the possibility of greatly decreasing vibrations of the color selecting electrode, and hardly causing a color shift.
Preferably, the starting position on the surface of the frame is within 2mm from the end of the color selecting electrode.
Preferably, the forming step includes a step for forming a welding cutout in the color selecting electrode where the striped thin metal slits is not formed.
Preferably, the color selecting electrode is positioned to the frame so that an end of the frame is placed in said welding cutout of the color selecting electrode, and the welding is started from a predetermined position in the welding cutout of the color selecting electrode.
Preferably, the welding is carried out by a discoid welding electrode.
Preferably, the discoid welding electrode is pressed on the color selecting electrode placed on the frame, and rotated to move on the surface of the color selecting electrode.
Preferably, the circumference of the discoid welding electrode is contacted with the surface of the frame at a position within predetermined distance from an edge of the welding cutout in starting the welding, and rotated to move on the surface of the color selecting electrode.
Advantageously a method of manufacturing a color selecting apparatus for a cathode ray tube further comprises a step of mounting a damping wire on the striped thin metal slits at a predetermined tension so as to perpendicularly intersect the striped thin metal slits, after the welding of the color selecting electrode and the frame.
Preferably a method of manufacturing a color selecting apparatus for a cathode ray tube further comprises a step of removing an outer periphery of the color selecting electrode after the welding of the color selecting electrode and the frame.
Preferably, the welding cutout is formed on an end part parallel with the striped thin metal slits, and removed by the removing of the outer periphery of the color selecting electrode.
Preferably, the providing step includes a step for tensing the color selecting electrode at a predetermined force in the direction of the striped thin metal slits.
The invention is diagrammatically illustrated by way of example in the accompanying drawings, in which:
Fig. 1 is a perspective view of a cathode ray tube having a color selecting apparatus;
Fig. 2 is a perspective view showing a color selecting apparatus;
Figs. 3A to 3E are views showing a procedure for assembling a color selecting apparatus;
Fig. 4 is a schematic view showing the shape of the marginal portion of a color selecting apparatus at start of welding;
Fig. 5 is a schematic view showing a state in which a damping wire does not completely contact striped thin metal slits; and
Figs. 6A and 6B are views for explaining a method of manufacturing a color selecting apparatus for a cathode ray tube of the present invention, in which Fig.6A is an illustration viewed from the upside of a color selecting apparatus and Fig.6B is an illustration viewed from the lateral side of a frame.
Preferred embodiments of the present invention will be explained with reference to the attached drawings.
Figure 6A and 6B are illustrations for explaining a method of manufacturing a color selecting electrode for a cathode ray tube of the present invention, in which
Fig. 6A is an illustration viewed from the upside of an color selecting electrode 5 and
Fig. 6B is an illustration viewed from the lateral side of a frame member la.
As shown in Fig.6A, striped thin metal slits 4 are formed on the color selecting electrode S and the color selecting electrode S has a marginal portion Sa on its margin. A predetermined region of the marginal portion Sa is joined with a portion lam to be welded of the frame member la by means of welding.
A welding cutout 5b is formed on a marginal portion of color selecting electrode 5 parallel with the striped thin metal slits 4.
The welding cutoff Sb is formed by cutting out the marginal portion 5a of the color selecting electrode 5 correspondent to an end of the frame member la and lb.
An edge P1 becomes an end of the color selecting electrode after the removing of the marginal portion Sa.
Figure 6A is a view showing a welding cutout only a part correspondent to the frame member la, other part correspondent to the frame member 1b is also formed in the same shape and both of the parts are formed continuously in each other.
The above color selecting electrode is mounted on the holder 6, as shown in
Fig.3Aa, under the state applying a compressive force F to the frame members la and lb of the frame 1.
Then the color selecting electrode 5 is provided to the frame 1 so that an edge face of the frame member la is brought to a predetermined position within a region of the welding cutout formed on the outer marginal portion Sa of the color selecting electrode. As described in Fig. 3B, the marginal portion Sa is held by the pressing jig 7 and pulled at a tension f so that the color selecting electrode 5 does not loosen.
The tension f has a value when a tensile stress of 30 to 70 kgf/mm2 works on the striped thin metal slits 4. The above tension is applied to prevent the position of an electron-beam passing hole from changing due to thermal expansion during operation.
Under the above state, as shown in Fig.6B, the frame member la is pressed by the circumference of the discoid welding electrode 8 at a position within the welding cutout Sb, and rotated in the direction of an arrow along with the frame members la and lb.
The marginal portion Sa of the color selecting electrode 5 is welded to the surface lam to be welded of the frame member la when the discoid welding electrode 8 rotates in the arrow direction and advances. The case of the frame member ib is, although not shown, the same.
Symbol P2 in Figs. 6A and 6B denotes a tangent position when the outer periphery 8a of the discoid welding electrode 8 contacts the surface of the frame member la at the rotation start position of the discoid welding electrode 8.
Thus the rotational start position is set so that the distance L between a rotational start position P2 and an end face of the welding cutout Sb is within predetermined distance.
Accordingly, as described below, the aperture grille vibration occurrence rate of assembled color selecting electrode can be greatly decreased.
The holder 6 and the pressing jig 7 are removed and the compressive force F applied to the frame members la and 1b are released. Then, as shown in Fig. 3E, assembling of the color selecting apparatus 10 is completed by removing the marginal portion Sa of the color selecting electrode S jutting out of the frame 1. Accordingly, the welding cutout Sb is also removed by the removing of the marginal portion Sa.
Next, as shown in Fig. 2, a damping wire 9 is mounted to the color selecting apparatus 10 so as to perpendicularly intersect the striped thin metal slits 4 in order to prevent vibrations of the striped thin metal slits 4.
The color selecting apparatus of this embodiment is assembled by the above steps.
The following shows how the striped thin metal slits vibration (AG vibration) occurs by changing the distance L between the tangent position P2 and the end position P1 from 0 to 10 mm when the outer periphery 8a of the discoid welding electrode 8 contacts the surface of the frame member la at the rotation start position of the discoid welding electrode 8.
[Table 1]
b I 1 I d Embodiment Embodiment Embodiment Comparative Comparative 1 2 3 example 1 example 2 L Omm 2mm swim 7mm loilim AG vibration occurrence 0% 0.5% 3% 20% 70% rate AG vibration occurrence state depending on welding start position
The embodiment 1 in Table 1 shows a case in which the distance L is0 mm, that is, a case in which welding is started from the end position P1. In this case, the
AG vibration does not occur at all.
The embodiment 2 shows a case in which the distance L is 2 mm. In this case, the AG vibration occurrence rate is approx. 0.5% and therefore, the AG vibration slightly occurs.
The embodiment 1 shows a case in which the distance L is 5 mm. In this case, the AG vibration occurrence rate is approx. 3% and therefore, the AG vibration slightly increases.
Then, the comparative example 1 shows a case in which the distance L is 7 mm. In this case, the AG vibration occurrence rate comes to approx. 20% and therefore, it greatly increases.
The comparative example 1 shows a case in which the distance L is 10 mm.
In this case, the AG vibration occurrence rate comes to approx. 70% and therefore, it further greatly increases.
From the above results, it is found that the AG vibration occurrence rate greatly decreases when the distance L between the tangent position P2 and the end position P1 is kept in a range of S mm or less where the outer periphery 8a of the discoid welding electrode 8 contacts the surface of the frame member la at the rotation start position of the discoid welding electrode 8.
Moreover, it is found that the AG vibration occurrence rate extremely increases when the distance L exceeds 5 mm.
Therefore, the discoid welding electrode 8 hardly turns up a portion nearby the end position P1 of the color selecting electrode 5 when the distance L is kept in a range of 0 to 5 mm. Therefore, no bumps are produced at a portion nearby the end position P1 of the color selecting electrode 5 or a portion nearby a welding start position or the striped thin metal slits 4 is not twisted or creased.
Therefore, as shown in Fig. 3, the damping wire 9 with a diameter of 10 to 30 m which is set so as to perpendicularly intersect the striped thin metal slits 4 in order to prevent the striped thin metal slits 4 from vibrating completely contacts the striped thin metal slits 4. Therefore, even if vibrations occur in the striped thin metal slits 4, they are immediately damped. As a result, because the relative positional relation between the striped thin metal slits 4 and a phosphor screen is hardly changed, it is possible to greatly reduce the AG vibration occurrence rate and manufacture a cathode ray tube having no problem on a color shift or the like.
Moreover, in the case of this embodiment, the welding cutout 5b cut out into a predetermined shape shown in Fig.6A is formed on the marginal portion 5a of the color selecting electrode 5. Therefore, it is easily possible to keep the distance L in a range of 0 to 5 mm.
Furthermore, this embodiment is described about a case of welding the marginal portion Sa of the color selecting electrode 5 to the frame member la.
However, the same is true for the frame member lb.
As described above, a method of manufacturing a color selecting apparatus for a cathode ray tube makes it possible to prevent a color selecting electrode from twisting or creasing at a welding start position by setting the rotation start position of a discoid welding electrode to a predetermined position from an end of the color selecting electrode when welding the color selecting electrode to a frame, and thereby obtain a cathode ray tube hardly causing the color selecting electrode to vibrate and having no problem on a color shift or the like.
Claims (12)
1. A method of manufacturing a color selecting apparatus for a cathode ray tube in which a color selecting electrode having striped thin metal slits is welded on a frame, comprising the steps of:
forming a plurality of the striped thin metal slits on the color selecting electrode,
providing the color selecting electrode on the frame, and
welding the color selecting electrode and the frame, a starting position of the welding being a predetermined distance from an end of the color selecting electrode.
2. A method of manufacturing a color selecting apparatus for a cathode ray tube as set forth in claim 1, wherein the starting position on the surface of the frame is within 2mm from the end of the color selecting electrode.
3. A method of manufacturing a color selecting apparatus for a cathode ray tube as set forth in claim 1, wherein the forming step includes a step for forming a welding cutout in the color selecting electrode where the striped thin metal slits is not formed.
4. A method of manufacturing a color selecting apparatus for a cathode ray tube as set forth in claim 3, wherein the color selecting electrode is positioned to the frame so that an end of the frame is placed in said welding cutout of the color selecting electrode, and the welding is started from a predetermined position in the welding cutout of the color selecting electrode.
S. A method of manufacturing a color selecting apparatus for a cathode ray tube as set forth in claim 1, wherein the welding is carried out by using a discoid welding electrode.
6. A method of manufacturing a color selecting apparatus for a cathode ray tube as set forth in claim S, wherein the discoid welding electrode is pressed on the color selecting electrode placed on the frame, and rotated to move on the surface of the color selecting electrode.
7. A method of manufacturing a color selecting apparatus for a cathode ray tube as set forth in claim 5, wherein the circumference of the discoid welding electrode is contacted with the surface of the frame at a position within predetermined distance from an edge of the welding cutout in starting the welding, and rotated to move on the surface of the color selecting electrode.
8. A method of manufacturing a color selecting apparatus for a cathode ray tube as set forth in claim 1, further comprising a step of mounting a damping wire on the striped thin metal slits at a predetermined tension so as to perpendicularly intersect the damping wire to the striped thin metal slits, after the welding of the color selecting electrode and the frame.
9. A method of manufacturing a color selecting apparatus for a cathode ray tube as set forth in claim 1, further comprising a step of removing an outer periphery of the color selecting electrode after the welding of the color selecting electrode and the frame.
10. A method of manufacturing a color selecting apparatus for a cathode ray tube as set forth in claim 9, wherein the welding cutout is formed on an end part parallel with the striped thin metal slits, and removed by the removing of the outer periphery of the color selecting electrode.
11. A method of manufacturing a color selecting apparatus for a cathode ray tube as set forth in claim 1, wherein the providing step includes a step for tensing the color selecting electrode at a predetermined force in the direction of the striped thin metal slits.
12. A method of manufacturing a color selecting apparatus for a cathode ray tube substantially as hereinbefore described and illustrated with reference to Figs. 6A and 6B of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5877096A JPH09251837A (en) | 1996-03-15 | 1996-03-15 | Manufacture of cathode-ray tube |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9705060D0 GB9705060D0 (en) | 1997-04-30 |
| GB2311165A true GB2311165A (en) | 1997-09-17 |
| GB2311165B GB2311165B (en) | 2000-08-16 |
Family
ID=13093794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9705060A Expired - Fee Related GB2311165B (en) | 1996-03-15 | 1997-03-12 | Method of manufacturing a color selecting apparatus for a cathode ray tube |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH09251837A (en) |
| CN (1) | CN1170951A (en) |
| GB (1) | GB2311165B (en) |
| SG (1) | SG52931A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0982752A2 (en) * | 1998-08-26 | 2000-03-01 | Matsushita Electronics Corporation | Method and apparatus for manufacturing a shadow mask |
| US6225736B1 (en) | 1999-04-01 | 2001-05-01 | Thomson Licensing S.A. | Color picture tube having a low expansion tension mask attached to a higher expansion frame |
| US6274975B1 (en) | 1999-04-01 | 2001-08-14 | Thomson Licensing S.A. | Color picture tube having a tension mask attached to a frame |
| US6455992B1 (en) | 1999-04-12 | 2002-09-24 | Thomson Licensing S.A. | Color picture tube having a low expansion tension mask attached to a higher expansion frame |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4682965A (en) * | 1983-12-08 | 1987-07-28 | Sony Corporation | Method for manufacturing an electron beam selection electrode |
| JPS6450338A (en) * | 1987-08-21 | 1989-02-27 | Hitachi Ltd | Manufacture of shadow mask frame |
| US4834686A (en) * | 1987-12-29 | 1989-05-30 | Zenith Electronics Corporation | Rail mapping method and apparatus |
| US4857027A (en) * | 1987-09-25 | 1989-08-15 | Sony Corporation | Method of manufacturing color screen structure for a cathode ray tube |
| US4887988A (en) * | 1987-01-27 | 1989-12-19 | Videocolor | Method for the mounting of a shadow mask in a trichromatic cathode tube and cathode tube comprising a shadow mask mounted according to this method |
-
1996
- 1996-03-15 JP JP5877096A patent/JPH09251837A/en active Pending
-
1997
- 1997-03-11 SG SG1997000760A patent/SG52931A1/en unknown
- 1997-03-12 GB GB9705060A patent/GB2311165B/en not_active Expired - Fee Related
- 1997-03-15 CN CN 97109582 patent/CN1170951A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4682965A (en) * | 1983-12-08 | 1987-07-28 | Sony Corporation | Method for manufacturing an electron beam selection electrode |
| US4887988A (en) * | 1987-01-27 | 1989-12-19 | Videocolor | Method for the mounting of a shadow mask in a trichromatic cathode tube and cathode tube comprising a shadow mask mounted according to this method |
| JPS6450338A (en) * | 1987-08-21 | 1989-02-27 | Hitachi Ltd | Manufacture of shadow mask frame |
| US4857027A (en) * | 1987-09-25 | 1989-08-15 | Sony Corporation | Method of manufacturing color screen structure for a cathode ray tube |
| US4834686A (en) * | 1987-12-29 | 1989-05-30 | Zenith Electronics Corporation | Rail mapping method and apparatus |
Non-Patent Citations (1)
| Title |
|---|
| Patent Abstracts of Japan [E-770], Vol 13, No 248 & JP 01 050 338 A * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0982752A2 (en) * | 1998-08-26 | 2000-03-01 | Matsushita Electronics Corporation | Method and apparatus for manufacturing a shadow mask |
| EP0982752A3 (en) * | 1998-08-26 | 2002-06-12 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for manufacturing a shadow mask |
| US6225736B1 (en) | 1999-04-01 | 2001-05-01 | Thomson Licensing S.A. | Color picture tube having a low expansion tension mask attached to a higher expansion frame |
| US6274975B1 (en) | 1999-04-01 | 2001-08-14 | Thomson Licensing S.A. | Color picture tube having a tension mask attached to a frame |
| US6455992B1 (en) | 1999-04-12 | 2002-09-24 | Thomson Licensing S.A. | Color picture tube having a low expansion tension mask attached to a higher expansion frame |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9705060D0 (en) | 1997-04-30 |
| CN1170951A (en) | 1998-01-21 |
| GB2311165B (en) | 2000-08-16 |
| SG52931A1 (en) | 1998-09-28 |
| JPH09251837A (en) | 1997-09-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20020312 |