EP1244131A1 - Tube à rayons cathodique - Google Patents

Tube à rayons cathodique Download PDF

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Publication number
EP1244131A1
EP1244131A1 EP01107095A EP01107095A EP1244131A1 EP 1244131 A1 EP1244131 A1 EP 1244131A1 EP 01107095 A EP01107095 A EP 01107095A EP 01107095 A EP01107095 A EP 01107095A EP 1244131 A1 EP1244131 A1 EP 1244131A1
Authority
EP
European Patent Office
Prior art keywords
cathode ray
predetermined breaking
screen
breaking point
ray tube
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.)
Withdrawn
Application number
EP01107095A
Other languages
German (de)
English (en)
Inventor
Ralf Kehlenbeck
Peter Elfner
Stefan Hergott
Roland Kellner
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.)
Schott AG
Carl Zeiss AG
Original Assignee
Carl Zeiss AG
Schott Glaswerke AG
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 Carl Zeiss AG, Schott Glaswerke AG filed Critical Carl Zeiss AG
Priority to EP01107095A priority Critical patent/EP1244131A1/fr
Publication of EP1244131A1 publication Critical patent/EP1244131A1/fr
Withdrawn legal-status Critical Current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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/87—Arrangements for preventing or limiting effects of implosion of vessels or containers

Definitions

  • the invention relates to cathode ray tubes, especially a television tube.
  • the invention aims to prevent implosion of cathode ray tubes to increase.
  • a cathode ray tube is divided into the following areas: the funnel neck, which contains the electron beam gun and is cylindrical; the parabola area around which the deflection coil for guiding the electron beam is arranged and which generally has a round or also rectangular, increasing cross-sectional area; the funnel body, the cross-sectional area of which increases steadily and generally changes from a round or oval to a rectangular shape until the cross-sectional area of the screen is reached.
  • the funnel body and screen are connected to one another via contact surfaces , hereinafter referred to as soldering edges .
  • a so-called implosion band is usually on the web of the Screen applied to the static deformation and thus the forced Counteract tensions.
  • Such a tube is shown in Fig. 1.
  • the tube itself is known to be under vacuum inside. This will in the Glass parts creates a complex, more or less high tension. By very rapid changes in temperature and / or external damage can be a implode such cathode ray tube. The resulting glass fragments are also thrown outwards by scattering through the screen, which can lead to serious injuries.
  • Implosion band it is often found that the implosion security by a so-called Implosion band to be improved.
  • Such an implosion band is in the Usually shrunk onto the web of the screen, but there are also others Tensioning possibilities in use, as described for example in US 4,567,626. This is said to cause deformation of the screen caused by the interior Vacuum is caused to be counteracted. The screen should thus be physically stabilized. With such an implosion band, nothing else done than to limit certain deformations. If an implosion occurs, glass fragments can still occur hurled through the screen. Therefore there is one Solution still has a real potential danger. Furthermore is in the patent US 4,158,419 indicated that the principle of an implosion band, like it is not applicable to all screen types, e.g. at Flat panel displays. Even for large television tubes, an implosion band is not more suitable (patent US 4,943,862).
  • Resolutions that are applied to the screen.
  • Such resolutions can be, for example, a letter of intent such as that described in US patent 4,204,231, or special coatings (such as resins; described for example in the patent US 4,943,862).
  • These measures can a throwing out of broken glass in an implosion avoid, for example, by the resin binding the resulting glass fragments, however, such a method also has various disadvantages.
  • the application each individual coating, or each front lens is another Process step that is expensive on the one hand and on the other hand also potential for errors offers, such as the formation of bubbles, impurities, etc. If such an error occurs, the coated screen is usually not more usable in the further process chain. This creates more Additional costs due to an increased scrap.
  • Another disadvantage is in that a screen edited like this after the end of its life cannot be recycled without preparation (separation of the coatings). This is precisely the point in the course of increasing environmental protection decisive disadvantage.
  • the object of the invention is to provide a cathode ray tube or a television tube, to find an improved compared to the known, previously used Protection against implosion.
  • This object is achieved in that at least one in the base body Predetermined breaking point is introduced.
  • the cathode ray tube has normal vacuum loading have sufficient strength while abrupt Impact load with a bullet according to VDE 0864 at the predetermined breaking point defined breaks. This causes the glass to eject forward, which is too significant Security risks lead, prevent or minimize. Furthermore the cathode ray tube is reduced in weight. This means that neither Wall thickness must be increased, additional components on the cathode ray tube must be applied. The television tube remains recyclable without further steps to separate materials are necessary.
  • the predetermined breaking point according to the invention can take the form of a defined weakening of the material.
  • Such weakening of material can occur both in hot-forming production, as well as after hot forming, for example by milling, drilling, Etching or the like. Such a weakening of the Material can be on both the inside and outside of the tube be attached.
  • a predetermined breaking point offers the possibility of being thick-walled for reasons of implosion executed areas of the tube such as the front of the screen, to be thinner-walled and still to get a safe tube. Thereby additional material and thus weight and costs are saved.
  • Finite element calculations were performed to measure the stresses in a Simulate cathode ray tube with predetermined breaking points.
  • the basic idea is in that the tensile stress generated by a projectile impact on the Front in the middle of the screen, where the predetermined breaking point should be higher, than on the inside of the screen at the floor impact point. Thereby it should be ensured that the tube tears at the predetermined breaking point. requirement however, it is that the tube generates the generated under pure vacuum load Withstands tensile stress.
  • Fig. 1 shows a cathode steel tube according to the prior art.
  • the predetermined breaking points to be provided are described below with reference to FIGS. 3 to 6 explained in more detail.
  • the opening angle is shown in FIG. 2 for further explanation of the geometries ⁇ and the rounding radius R.
  • FIG. 3 shows the predetermined breaking point 9 on the peripheral edge 8 of the screen, which can be regarded as particularly suitable. 3, shown in dashed lines, is the standard design of the peripheral edge of the screen 8. It can clearly be seen that such a predetermined breaking point 9 can also save glass material and thus also weight and costs. The weight saving depends on the size of the screen 4 and the groove depth and can be, for example, in the range from about 0.5 kg to 2 kg. Another advantage of this design of a predetermined breaking point 9 is that it is very easy to manufacture.
  • the remaining wall thickness at the thinnest point of the predetermined breaking point 9 should not be less than 60% of the smallest wall thickness in the screen front, since otherwise the static vacuum resistance is no longer guaranteed. If this value is undershot and a safe tube is nevertheless reached, the screen 4 is generally too thick and consequently unnecessarily heavy and expensive.
  • Fig. 4 shows a variant of a notch in the area of the web 7 of the screen 4. It has been found to be most effective when such a notch is V-shaped is executed and is not rounded, because then the notch effect generated on is highest. If a projectile hits the screen 4, it will be in the notch generates a voltage that exceeds 100Mpa within a very short time. by virtue of Such a groove must be rounded off with the rapidly increasing tension a radius R, otherwise it can be expected that everyone small vibration the tube implodes. A rounding radius has been found to be suitable in the range of 0.1 mm ⁇ R ⁇ 10mm. Is the Radius smaller, the notch effect, as described, becomes too large; will the Radius larger, the notch effect decreases rapidly.
  • the remaining minimum wall thickness in the notch should be 40% not less than the actual wall thickness in the respective area, in order not to endanger the static vacuum resistance. If this value is not reached and still reaches a safe tube, the screen 4 is general too thick and therefore unnecessarily heavy and expensive.
  • Figure 6 shows a predetermined breaking point 9 in the area of the web 7 in the form of a perforation.
  • perforation is an abrupt cross-sectional narrowing of the screen 4, the web 7, the funnel body 3 or the parabolic region 2, which occurs at least twice at regular intervals over the circumference. Examples of this are holes (as shown in Figure 6), but also V and longitudinal grooves.
  • the minimum wall thickness in such a predetermined breaking point should not be less than 40% of the actual wall thickness in the respective area.
  • such perforations produce stresses in the range of 40 MPa after only 5 ⁇ 10 -4 s.
  • Fig. 7 is a comparison of the stresses in the static and dynamic case shown; static means here pure vacuum load, dynamic means Vacuum load plus floor impact after 0.5 ms from a drop height of 300mm.
  • the voltage curve applies to a predetermined breaking point 9, as in Figure 3 is shown. However, its basic course is also based on the other predetermined breaking points 9 can be transferred. It is clear to see that compared to the static load in the area of the predetermined breaking point 9 very high tensile stresses are generated under dynamic load. The rest The area of the screen 4 is comparatively little stressed.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
EP01107095A 2001-03-22 2001-03-22 Tube à rayons cathodique Withdrawn EP1244131A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01107095A EP1244131A1 (fr) 2001-03-22 2001-03-22 Tube à rayons cathodique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01107095A EP1244131A1 (fr) 2001-03-22 2001-03-22 Tube à rayons cathodique

Publications (1)

Publication Number Publication Date
EP1244131A1 true EP1244131A1 (fr) 2002-09-25

Family

ID=8176877

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01107095A Withdrawn EP1244131A1 (fr) 2001-03-22 2001-03-22 Tube à rayons cathodique

Country Status (1)

Country Link
EP (1) EP1244131A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158419A (en) * 1977-12-27 1979-06-19 Rca Corporation Implosion protected CRT
US4245255A (en) * 1979-04-13 1981-01-13 Corning Glass Works Implosion protection for TV tubes
US4264931A (en) * 1979-04-13 1981-04-28 Corning Glass Works Implosion protection for TV tubes
EP0061103A2 (fr) * 1981-03-20 1982-09-29 International Standard Electric Corporation Tube d'image avec protecteur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158419A (en) * 1977-12-27 1979-06-19 Rca Corporation Implosion protected CRT
US4245255A (en) * 1979-04-13 1981-01-13 Corning Glass Works Implosion protection for TV tubes
US4264931A (en) * 1979-04-13 1981-04-28 Corning Glass Works Implosion protection for TV tubes
EP0061103A2 (fr) * 1981-03-20 1982-09-29 International Standard Electric Corporation Tube d'image avec protecteur

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