CN1297241A - Longitudinal strengthening structure of magnetic shield for colour CRT and its design method - Google Patents
Longitudinal strengthening structure of magnetic shield for colour CRT and its design method Download PDFInfo
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- CN1297241A CN1297241A CN 99123740 CN99123740A CN1297241A CN 1297241 A CN1297241 A CN 1297241A CN 99123740 CN99123740 CN 99123740 CN 99123740 A CN99123740 A CN 99123740A CN 1297241 A CN1297241 A CN 1297241A
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- magnetic shield
- cathode ray
- reinforced ribs
- color cathode
- ray tube
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Abstract
A longitudinal reinforcing structure for magnetic shield of color CRT features that at least one reinforcing rib is made on the inclined surface of magnetic shield (or inner magnetic shield), where the strength is not enough. With said ribs, the inclined surface can not be damaged in the manufacture of CRT, so avoiding the generation of shadow on screen and effectively improving the inner magnetic shield shadow.
Description
The present invention relates to a kind of longitudinal strengthening structure and method for designing thereof of magnetic shield of color cathode ray tube, especially refer to a kind of by on the inclined-plane at undercapacity on the magnetic shield of cathode ray tube, longitudinally dash respectively and establish a reinforced ribs, the intensity on these these inclined-planes of longitudinal strengthening ribs energy reinforcement makes these inclined-planes be difficult for causing the design of caving in because of its weight, temperature or external force influence in the manufacture process of cathode ray tube.
In the manufacturing technology of existing cathode ray tube, consult shown in Figure 1, for avoiding the electron beam in the cathode ray tube 10 to be subjected to the influence in magnetic field of the earth, and taking place, electron beam drop point on display screen 11 is offset, cause the uneven phenomenon of picture, general all when making cathode ray tube 10, in its glass encapsulating body 12, insert a magnetic shield 20 with Magnetic Shielding Effectiveness.In theory, for the magnetic that improves magnetic shield 20 covers effect, except in the configuration design of magnetic shield 20, make its be close to as far as possible on the glass encapsulating body Taper Pipe (Funnel) inner face 13 outside, simultaneously, magnetic shield 20 also must adopt high permeability (Permeability) material, as: Hi-Top, Ni-Top ... Deng material, made.
In addition, magnetic shield is being installed in the process of cathode ray tube, be to be fixed on the framework 15 (Frame) of display screen 11 periphery inner faces with more than one shell fragment 14 (Clip), the formed passage 21 of magnetic shield 20 central position, be with so that 16 electrons excited bundles of electron gun can pass wherein, successfully be incident upon on the fluorescence coating 17 of display screen 11 inboards.So traditionally, magnetic shield adopts to take out and draws (Drawing) or bending (Bending) mode is made.Wherein by taking out the integrated magnetic shield 90 of the mode of drawing, its covering property of magnetic is preferable, and its profile is relatively near the shape (as shown in Figure 2) of Taper Pipe (Funnel) inner face of glass encapsulating body; If adopt the bending mode to make, its fabrication schedule will be bent into the U type respectively by two thin plates 81 that high permeability materials are made earlier, again by welding or snapping mode, with the upright bending type magnetic shield 80 that forms as shown in Figure 3 of these two U type thin plate groups.
Generally speaking, for alleviating the overall weight of cathode ray tube, all make magnetic shield with the high permeability materials between the about 0.10～0.15mm of thickness, because its thinner thickness, a little less than causing structural strength own, very easily be subjected to own wt, external force effect or influence of temperature variation, on the inclined-plane of its two symmetrical sides of growing, form the phenomenon of caving in, see also shown in Figure 4, when magnetic shield 70 is installed in the cathode ray tube usually, be positioned at the inclined-plane 71 of two long symmetrical sides of its upper and lower, mainly be the resilience moment that when bent angle is shaped, is produced by two adjacent corner 72, support the weight of itself material, the shape of magnetic shield 70 still can be maintained on the design size.But this situation, need to strengthen under the trend of its length at magnetic shield along with now large scale cathode ray tube, the weight that the moment that this corner 72 is produced can't be born the symmetrical inclined-plane 71 of this upper and lower, or the moment that this corner 72 is produced is equal to or greater than the critical moment that supports this symmetry inclined-plane weight 71 just, and this symmetry inclined-plane 71 is inwardly easily taken place or the wild effect of outwards being out of shape, hindered the path that electron beam is advanced, cause making and reflect pipe picture generation shadow, form so-called interior screen cover masking phenomenon (IS-Shadow).
Now, the design of various conventional cathode ray tube and manufacturer though equal problems of easily caving at magnetic shield is researched and developed out following various reinforcements, see also shown in Figure 5:
| The reinforcement mode | Pluses and |
| Reinforcement | |
| 61 comprehensively | Easy to make, but, easily cause the magnetic shield torsional deformation because of processing capacity is big |
| Arm of | Reinforcing effect is relatively |
| Bending reinforcement | |
| 63 | Reinforcing effect the best, but make difficulty, and the cost of manufacture height |
But these methods still can't reach an optimized design object on design and construction, cost of manufacture or reinforcing effect.
The longitudinal strengthening structure and the method for designing thereof that the purpose of this invention is to provide a kind of magnetic shield of color cathode ray tube, so that overcome traditional magnetic shield very easily can't bear upper and lower symmetry side inclined-plane because of the moment that its arm of angle produced weight, and this inclined-plane is caved in, hinder the travel path of electron beam, caused making the defective of reflecting pipe picture generation shadow.
The longitudinal strengthening structure of the magnetic shield of color cathode ray tube of the present invention is achieved in that this magnetic shield comprises: two sheet metals, these thin plates are bent into the U type respectively, be combined into one, the passage that also is taper between these two U type thin plates: on two sheet metals of this magnetic shield around formation one, be positioned at it on the inclined-plane of undercapacity, be provided with at least one reinforced ribs along vertically dashing respectively of this passage.
Wherein these reinforced ribs can be a reinforced ribs that extends along the shape that vertically is in line of this passage.
Wherein these reinforced ribs can be a reinforced ribs that extends along the regular path of vertical one-tenth of this passage.
Wherein these reinforced ribs can be a reinforced ribs that extends along the irregular path of vertical one-tenth of this passage.
Wherein these reinforced ribs can be dashed and are located on the position that becomes a suitable angle on this inclined-plane with this longitudinal centre line, the angle on another inclined-plane that this angle must be adjacent greater than this longitudinal centre line.
Wherein these reinforced ribs can be dashed and are set as a circular-arc section.
Wherein these reinforced ribs can be dashed and are set as a leg-of-mutton section.
Wherein these reinforced ribs can be dashed and are set as a trapezoidal section.
The about deeply 1mm of the rib of these reinforced ribs wherein.
Wherein between the about 2mm～10mm of the rib width of these reinforced ribs.
The method for designing of the longitudinal strengthening of the magnetic shield of color cathode ray tube of the present invention is achieved in that this method is on the inclined-plane at undercapacity on the magnetic shield of a cathode ray tube, extends longitudinally to dash respectively to establish at least one reinforced ribs.
Wherein the bearing of trend of these reinforced ribs is in the angular range of the conial channel that surrounds at this magnetic shield.
Wherein the bearing of trend of these reinforced ribs must not be greater than the angle on another inclined-plane adjacent with this inclined-plane.
The present invention mainly is on the inclined-plane at undercapacity on the magnetic shield of cathode ray tube, longitudinally dash respectively and establish at least one reinforced ribs, the intensity on these these inclined-planes of longitudinal strengthening ribs energy reinforcement, make these inclined-planes be difficult in the manufacture process of cathode ray tube, being subjected to the influence of itself weight, variations in temperature or external force effect, cause and cave in, avoid producing shadow in the display frame of cathode ray tube, effectively improve so-called interior screen cover masking phenomenon (IS-Shadow), it is is not only designed and constructed simply, cost of manufacture is low, and has splendid reinforcing effect.
Fig. 1 is the generalized section of conventional cathode ray tube;
Fig. 2 is that tradition is taken out the schematic perspective view that draws the formula magnetic shield;
Fig. 3 is the schematic perspective view of traditional folding type magnetic shield;
Fig. 4 is traditional magnetic shield when being installed in the cathode ray tube, its horizontal section schematic diagram;
Fig. 5 is the schematic perspective view of tradition through the magnetic shield of reinforcement;
Fig. 6 is the schematic perspective view with magnetic shield of longitudinal strengthening rib of the present invention;
Fig. 7 is the horizontal section schematic diagram of the longitudinal strengthening rib on the magnetic shield of the present invention;
Fig. 8 is the longitudinal profile schematic diagram of another embodiment of the present invention;
Fig. 9 is the longitudinal profile schematic diagram of another embodiment of the present invention.
Among the present invention, consult shown in Figure 6, adopt the bending mode, to be bent into the U type respectively by two thin plates 22 that high permeability materials are made earlier, again by welding or snapping 40 modes, these two U type thin plates 22 are combined into a magnetic shield 20, the central position of this magnetic shield 20 is centered on by these two U type thin plates and forms a passage 21, and its shape is taper, just can be installed in glass encapsulating body Taper Pipe (Funnel) inner face of a cathode ray tube, this magnetic shield 20 is to adopt high permeability (Permeability) material to be made, after this magnetic shield 20 is mounted to a cathode ray tube, can make the electron beam in the cathode ray tube not be subjected to the influence in magnetic field of the earth, correctly be projected on the display screen in the cathode ray tube.
In one embodiment of this invention, consult shown in Figure 6 again, these magnetic shield 20 upper belows thereon are on the inclined-plane 23 of undercapacity, longitudinally dash respectively and be provided with at least one reinforced ribs 30, stress and moment that these inclined-planes 23 can be produced because of these longitudinal strengthening rib 30 plastic deformations, raising is to the support force of inclined-plane 231,232 weight between the two adjacent edge angles 24 on this reinforced ribs 30 and this magnetic shield 20, makes these inclined-planes be difficult for being subjected in the manufacture process of cathode ray tube the influence of itself weight, variations in temperature or external force effect to cause and caves in.Consult shown in Figure 7, in this embodiment of the present invention, these longitudinal strengthening ribs 30 are dashed is set as a circular-arc section, the about deeply 1mm of its rib, the about 4mm of rib width, the moulding of this longitudinal strengthening rib 30, via experimental results show that, really can improve the intensity and the stability on these inclined-planes 23, passage 21 limits of this magnetic shield 20 effectively, can effectively improve so-called interior screen cover masking phenomenon, avoid in the display frame of cathode ray tube, producing shadow.When the present invention implemented in reality, the section configuration of these longitudinal strengthening ribs 30 also can be and anyly is easy to punching press and takes off the shape of touching, as triangle, trapezoidal ... Deng, and for avoiding excessive because of processing capacity, its rib width should be controlled between about 2mm～10mm.
In another embodiment of the present invention, consult shown in Figure 8 again, these longitudinal strengthening ribs 30 also can be dashed to be located on this inclined-plane 23 than two long symmetrical sides, magnetic shield 20 upper below thereon, and form a suitable angle α with the longitudinal centre line on this inclined-plane 23, this angle α must be greater than the angle theta on this longitudinal centre line and adjacent another inclined-plane 25, just: α θ.
In addition; in another embodiment of the present invention, consult shown in Figure 9, these longitudinal strengthening ribs 30 reinforced ribs that shape extends that is not limited to longitudinally to be in line; the reinforced ribs that other longitudinally becomes rule or irregular path to extend also all belongs to the present invention and advocates the scope protected.
Claims (13)
1, a kind of longitudinal strengthening structure of magnetic shield of color cathode ray tube, it is characterized in that: this magnetic shield comprises: two sheet metals, these thin plates are bent into the U type respectively, be combined into one, the passage that also is taper between these two U type thin plates: on two sheet metals of this magnetic shield around formation one, be positioned at it on the inclined-plane of undercapacity, be provided with at least one reinforced ribs along vertically dashing respectively of this passage.
2, the longitudinal strengthening structure of the magnetic shield of a kind of color cathode ray tube as claimed in claim 1 is characterized in that: wherein these reinforced ribs can be a reinforced ribs that extends along the shape that vertically is in line of this passage.
3, the longitudinal strengthening structure of the magnetic shield of a kind of color cathode ray tube as claimed in claim 1 is characterized in that: wherein these reinforced ribs can be a reinforced ribs that extends along the regular path of vertical one-tenth of this passage.
4, the longitudinal strengthening structure of the magnetic shield of a kind of color cathode ray tube as claimed in claim 1 is characterized in that: wherein these reinforced ribs can be a reinforced ribs that extends along the irregular path of vertical one-tenth of this passage.
5, the longitudinal strengthening structure of the magnetic shield of a kind of color cathode ray tube as claimed in claim 1, it is characterized in that: wherein these reinforced ribs can be dashed and are located on the position that becomes a suitable angle on this inclined-plane with this longitudinal centre line, the angle on another inclined-plane that this angle must be adjacent greater than this longitudinal centre line.
6, as the longitudinal strengthening structure of the magnetic shield of claim 1 or 2 or 3 or 4 or 5 described a kind of color cathode ray tubes, it is characterized in that: wherein these reinforced ribs can be dashed and are set as a circular-arc section.
7, as the longitudinal strengthening structure of the magnetic shield of claim 1 or 2 or 3 or 4 or 5 described a kind of color cathode ray tubes, it is characterized in that: wherein these reinforced ribs can be dashed and are set as a leg-of-mutton section.
8, as the longitudinal strengthening structure of the magnetic shield of claim 1 or 2 or 3 or 4 or 5 described a kind of color cathode ray tubes, it is characterized in that: wherein these reinforced ribs can be dashed and are set as a trapezoidal section.
9, as the longitudinal strengthening structure of the magnetic shield of claim 1 or 2 or 3 or 4 or 5 described a kind of color cathode ray tubes, it is characterized in that: the about deeply 1mm of the rib of these reinforced ribs wherein.
10, as the longitudinal strengthening structure of the magnetic shield of claim 1 or 2 or 3 or 4 or 5 described a kind of color cathode ray tubes, it is characterized in that: wherein between the about 2mm～10mm of the rib width of these reinforced ribs.
11, a kind of method for designing of longitudinal strengthening of magnetic shield of color cathode ray tube is characterized in that: this method is on the inclined-plane at undercapacity on the magnetic shield of a cathode ray tube, extends longitudinally to dash respectively to establish at least one reinforced ribs.
12, the method for designing of the longitudinal strengthening of the magnetic shield of a kind of color cathode ray tube as claimed in claim 11 is characterized in that: wherein the bearing of trend of these reinforced ribs is in the angular range of the conial channel that surrounds at this magnetic shield.
13, the method for designing of the longitudinal strengthening of the magnetic shield of a kind of color cathode ray tube as claimed in claim 11 is characterized in that: wherein the bearing of trend of these reinforced ribs must not be greater than the angle on another inclined-plane adjacent with this inclined-plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99123740 CN1297241A (en) | 1999-11-18 | 1999-11-18 | Longitudinal strengthening structure of magnetic shield for colour CRT and its design method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99123740 CN1297241A (en) | 1999-11-18 | 1999-11-18 | Longitudinal strengthening structure of magnetic shield for colour CRT and its design method |
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| Publication Number | Publication Date |
|---|---|
| CN1297241A true CN1297241A (en) | 2001-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99123740 Pending CN1297241A (en) | 1999-11-18 | 1999-11-18 | Longitudinal strengthening structure of magnetic shield for colour CRT and its design method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308994C (en) * | 2002-08-12 | 2007-04-04 | 三星Sdi株式会社 | Internal shield and cathode-ray tube containing it |
-
1999
- 1999-11-18 CN CN 99123740 patent/CN1297241A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308994C (en) * | 2002-08-12 | 2007-04-04 | 三星Sdi株式会社 | Internal shield and cathode-ray tube containing it |
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