EP0145570A1 - Schattenmaske für eine Farbbildwiedergaberöhre und mit einer solchen Maske versehene Röhre - Google Patents

Schattenmaske für eine Farbbildwiedergaberöhre und mit einer solchen Maske versehene Röhre Download PDF

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Publication number
EP0145570A1
EP0145570A1 EP84402369A EP84402369A EP0145570A1 EP 0145570 A1 EP0145570 A1 EP 0145570A1 EP 84402369 A EP84402369 A EP 84402369A EP 84402369 A EP84402369 A EP 84402369A EP 0145570 A1 EP0145570 A1 EP 0145570A1
Authority
EP
European Patent Office
Prior art keywords
frame
mask
bimetallic
rim
strips
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
Application number
EP84402369A
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English (en)
French (fr)
Other versions
EP0145570B1 (de
Inventor
Carlo Luigi Fonda
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.)
Videocolor SA
Original Assignee
Videocolor SA
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 Videocolor SA filed Critical Videocolor SA
Priority to AT84402369T priority Critical patent/ATE35880T1/de
Publication of EP0145570A1 publication Critical patent/EP0145570A1/de
Application granted granted Critical
Publication of EP0145570B1 publication Critical patent/EP0145570B1/de
Expired 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H01J29/073—Mounting arrangements associated with shadow masks
    • 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
    • H01J2229/0716—Mounting arrangements of aperture plate to frame or vessel
    • 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
    • H01J2229/0722—Frame

Definitions

  • the present invention relates to a shade mask or color selection electrode for a television picture tube, or display, in color. It relates, more particularly, to means for attaching the mask to its support frame which are arranged so as to reduce the initial deformation (swelling or bending) of the mask under the effect of the heat generated by the electronic bombardment of the mask. this.
  • a mask tube generally comprises a glass envelope composed of a rectangular front panel (or slab), bordered by a skirt-shaped side wall, which is sealed to a so-called conical part which narrows and ends in a tubular neck housing at the end a set of three electron guns.
  • horizontal and vertical electromagnetic deflectors are provided for scanning the luminescent screen.
  • This screen composed of phosphors of three primary colors, red R, blue B and green V, is placed on the inside of the screen.
  • this screen is constituted by a repeated succession of three vertical bands of phosphors of different colors R, G, B.
  • the color selection electrode consists of a metal surface provided with a large number of oblong (or elongated rectangular) openings; it is called a shadow mask and is placed on the path of the three electron beams near, and substantially parallel to, the screen.
  • the effect of this mask is to allow only the beam of each electron beam to pass through. part directed towards only one of the bands of phosphors R, G and B, so that a beam is intended to strike the green bands V, another beam only reaches the blue bands B and the last beam only excites the red bands R; the selection is obtained thanks to the angles of incidence of the different beams at the location of the slits. But most (about 80%) of the electrons in each beam hit the mask without passing through the slits. This results in rapid heating of the part of the mask swept by the beams.
  • the mask As the mask must, during the manufacture of the tube, be removed and replaced several times and, in addition, be able to withstand predetermined mechanical shocks and vibrations without undergoing permanent deformation or displacement, it is generally supported by means a rigid metal frame which is preferably made of a profile having an L-shaped section and a thickness significantly greater than that of the mask (from 10 to 15 times, for example).
  • the thickness of the mask is generally between 100 and 200 micrometers, and that of the frame between 2 and 3 millimeters. These values obviously depend on the dimensions of the screen.
  • the thermal inertia of the frame is much higher than that of the mask; this frame is therefore heated only much more slowly.
  • the shadow mask is, from the start of the tube, heated much faster than the frame, heavy and thick.
  • This frame itself is only slightly reached by the electrons, which generally only touch it towards the beginning and the end of each line and each frame of the scan. Consequently, it is mainly heated from the mask and it does not reach its equilibrium temperature until much later than the latter. There is then a phenomenon of swelling or bending of the mask whose central part approaches the screen and whose edges welded to the frame remain held in place by the latter.
  • the frame is itself fixed to the skirt of the front panel using conventional mounting means with leaf springs.
  • This temporary swelling of the perforated mask causes displacements of the slots which, in the center, are purely axial and which have decreasing axial components from the center towards the periphery (where they are initially zero), and radial which are increasing from the center (where they are zero) until about halfway between the center and the edge (where they reach their maximum values) and from there they decrease towards this periphery.
  • This is schematically illustrated in section in FIG. 1, where curve A in dashed lines shows the profile of a mask 12 and of a cold frame 16 and curve B in dashed lines shows the profile of a hot mask 12 with a frame 16 cold causing said swelling.
  • the aforementioned movements of the slits have the effect of displacing the axes of the portions of the beams which pass through them with respect to the vertical axes of the phosphor strips R, G, and B associated in juxtaposed triplets, so as to cause register losses, or defects of alignment, which are highest in an annular zone situated approximately halfway between the center and the edge of the mask 12.
  • the frame 16 is also gradually heated, by conduction, by radiation and possibly by electron bombardment.
  • the frame 16 and the mask 12 are generally made of the same material (rolled steel), they have the same coefficient of thermal expansion.
  • the expansion of the frame 16, consecutive to that of the mask 12, has the effect, on the one hand, of reducing its swelling (by flattening it with respect to the curve B in FIG. 1), on the other hand, of increase the gap between the slots in it, i.e. move them radially.
  • Figure 2 shows (curve A in dashes similar to that of FIG.
  • the mask 12 therefore undergoes a small axial displacement in the center which increases with the radial distance and a spread in the radial direction which has the effect of producing an increase in the pitch and, to a lesser extent, in the width of the slots. This results in register losses due to the spreading of the slots in the plane of the expanded surface, which increase with the radial distance of these from the axis of the tube (i.e. with respect to in the center of the mask 12).
  • This inflation could have been significantly reduced, as well as other torsional effects exerted on the edges of mask 12, by limiting the number of welding points joining the skirt of the mask 12 to the belt of the frame 16 which are parallel, as described in FR-A-1 470 260.
  • the invention allows the production of bimetallic strips of simple shape and therefore inexpensive without compromising the quality of the reduction of the initial swelling of the mask.
  • the bimetallic strips arranged between the rim of the mask and the frame are flat with, preferably, a rectangular outline.
  • the rim of the mask When the rim of the mask is inside the frame, the latter has projections to which the first ends of the flat bimetals are welded, the second ends being welded to the rim of the mask, so that this rim is at a distance from the corresponding wall of the mask. frame to allow the mask to expand inside the frame.
  • each flat bimetallic strip is welded to the bottom of a corresponding notch that presents the frame.
  • the width of the notch is of course greater than the width of the bimetallic strip.
  • the temporary swelling, when the tube is started, of the mask 12 relative to the frame 16 is reduced by making possible the expansion in the radial direction of the mask practically independent of that of the frame.
  • FIG. 3 is a schematic front view respectively indicating the locations of the connecting bimetals 26 and the welds, of a mask-frame assembly according to the invention.
  • Each of the vertical sides, left and right, of the skirt of the mask 12 with slits 11 is joined to the adjacent side of the belt 180 of the frame, by means of three bimetallic tabs 26 of which one, 26 2 , is arranged in the middle on the side concerned and the other two, 26 1 and 26 3 , symmetrically on either side of this medium in the vicinity of the corners 13 1 and 13 2 .
  • the large horizontal sides of the frame and the skirt are directly joined together, for example by three welding points 311, 312 and 313, one of which 31 2 is in the middle and the other two 31 1 and 31 3 located symmetrically on the side and other from this environment.
  • three welding points 311, 312 and 313 one of which 31 2 is in the middle and the other two 31 1 and 31 3 located symmetrically on the side and other from this environment.
  • Figures 4 6, 8, and 10 are partial sectional views of embodiments of the mask-frame assemblies using flat bimetallic strips
  • Figures 5 7, 9, and 11 are perspective views of these bimetallic strips dishes used in the assemblies of the figures above.
  • a frame 16 is used, the side wall 18 of which is provided in its lower part with recesses or recesses 20 which constitute projections towards the inside of this side wall 18 regularly spaced, so that the plane defined by the interior surface is spaced from the rest of the internal face of the wall 18 sufficiently to allow the use of flat bimetals 260 shown in Figure 5.
  • Each bimetal consists of a blade 270 of low expansion and a blade 280 strong superimposed superimposed and joined, of which the first 270 is joined by its lower end to the internal face of the hollow 20, by a weld point 181 and whose second, 280, is joined by its upper end to the external face of the skirt 24, by another welding point 240.
  • the bimetallic strip 260 undergoes an outward bending, analogous to a pivoting in the direction of the arrow N around its point of attachment 181 to the frame 16.
  • the blade 270 one end of which is welded at a point 181 to the belt 18 of the frame 16, is preferably made of an alloy of nickel (30-40% for example) and iron, having a coefficient of thermal expansion weak (and generally known under the name "INVAR").
  • the other blade 280, the other end of which is welded at a point 240 to the skirt 24 of the mask 12 is made of steel, for example, cold rolled (like the mask and the frame) and has a high coefficient of thermal expansion .
  • Figures 6 and 7 partially show, respectively in section and in perspective, another embodiment of a mask-frame assembly using intermediate flat bimetallic strips.
  • the frame 16 is here of the spaced-apart type of recesses or recesses 20, as in FIG. 4.
  • the side wall 18 is provided with cutouts or slots 188 whose flat bottom, parallel to the base 19 of the frame 16, is offset towards the axis of the tube (the interior) relative to the upper edge of the side wall 18.
  • a flat bimetallic strip 262 is welded at 183, similar to that shown in FIG. 5.
  • This bimetallic strip 262 consists of 'a low expansion strip 272 facing outwards (opposite the axis of the tube) and a high expansion strip 282 facing inwards, superimposed and welded together.
  • the top of the internal face of the tab 262 is welded at 240 to the outside face of the skirt 24. When the temperature rises, the welding point 240 is displaced according to the arrow S, towards the outside so that the tabs 262 tighten the mask 12.
  • Figures 4, 5, 6, and 7 show mask-frame assemblies of the type where the skirt (24) is inside the side wall (18, 180) of the frame.
  • the compensating expansion of the swelling, obtained using bimetallic strips is limited to the width of the spacing between the outer face of the skirt 24 and the inner face. of the belt 18 or 180. This limitation is nonexistent in assemblies of the mask type, the skirt 24 of which surrounds the side wall 180 of the frame.
  • FIG. 8 is a partial section of the simplest embodiment of a mask-frame assembly of the type with external skirt using a flat bimetallic strip 263, shown in perspective in FIG. 9.
  • This bimetallic strip 263 consists of a low expansion strip 273 and a high expansion strip 283, superimposed and joined.
  • the lower end of the accessible face of the strip 283 is joined by a weld point 184 at the bottom of the outer face of the side wall 180 of the frame 160.
  • the top of the accessible face of the strip 273 is welded at 241 to the inner face of the skirt 24.
  • a frame 16 is also used, the substantially flat side wall 18 of which (without recesses or protrusions) is provided with slots 187 making it possible to place bimetal 265 flat rectangular plates, each composed of a strip 275 with low expansion and a strip 285 with high expansion, superimposed and welded together over their entire interface, similar to bimetallic strips 260, 262, and 263 in FIGS. 5, 7, and 9.
  • the bottom of the slot 187 is flat and parallel to the base 19 of the frame 16 so as to be able to carry the lower end of the bimetal strip 265 which is joined to this bottom by a weld 186.
  • the accessible face of the low-expansion lamella 275 can be arranged in alignment with the external face of the lateral pacpi of the belt 18 or slightly projecting with respect thereto, the internal face of the skirt 24 of the mask 12 being joined by a weld point 241 at the upper part of the external face of the bimetal strip 265.
  • this face is coplanar with that of the belt 18, the internal face of the skirt 24 can be in contact with the external face of the belt 18 at beginning of the operation of the tube, which possibly makes it possible to ensure faster initial heating of the frame 16, in particular as regards its horizontal lateral branches (left and right).
  • the frame 16 is provided with slots to accommodate the bimetallic strips 262 or 265, the latter is weakened by these cutouts and must have a thickness sufficient to compensate for the weakening .
  • the use of a light frame (160) can be advantageous from the point of view, on the one hand, of the reduction of the temporary swelling as regards its amplitude and duration and, on the other part, compensation for the overall expansion of the frame and the mask, generally provided by conventional bimetal assemblies, which are provided with the frame suspension springs to the front slab of the tube, because the faster temperature rise of the light frame favors that of the bimetallic parts which are welded to it.
  • a radial deviation towards the center is positive and towards the negative edge.
  • the curves in FIG. 12 have been drawn for a temperature rise from 25 to 55 ° C.
  • the curve Y corresponds to a mask-frame assembly according to the invention but without the conventional compensation means ensuring the approximation of the mask assembly - frame of the screen by its axial displacement towards the front while the 0 ⁇ curve relates to a mask-frame assembly according to the invention with in addition said conventional compensation means constituted by bimetallic strips between the frame and the springs of suspension to the glass slab.
EP84402369A 1983-11-25 1984-11-20 Schattenmaske für eine Farbbildwiedergaberöhre und mit einer solchen Maske versehene Röhre Expired EP0145570B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84402369T ATE35880T1 (de) 1983-11-25 1984-11-20 Schattenmaske fuer eine farbbildwiedergaberoehre und mit einer solchen maske versehene roehre.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8318853 1983-11-25
FR8318853A FR2555808B1 (fr) 1983-11-25 1983-11-25 Masque d'ombre pour tube d'image en couleurs et tube d'image le comportant

Publications (2)

Publication Number Publication Date
EP0145570A1 true EP0145570A1 (de) 1985-06-19
EP0145570B1 EP0145570B1 (de) 1988-07-20

Family

ID=9294547

Family Applications (2)

Application Number Title Priority Date Filing Date
EP84402368A Expired EP0143707B1 (de) 1983-11-25 1984-11-20 Schattenmaske für eine Farbbildwiedergaberöhre und mit einer solchen Maske versehene Röhre
EP84402369A Expired EP0145570B1 (de) 1983-11-25 1984-11-20 Schattenmaske für eine Farbbildwiedergaberöhre und mit einer solchen Maske versehene Röhre

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP84402368A Expired EP0143707B1 (de) 1983-11-25 1984-11-20 Schattenmaske für eine Farbbildwiedergaberöhre und mit einer solchen Maske versehene Röhre

Country Status (6)

Country Link
US (2) US4678963A (de)
EP (2) EP0143707B1 (de)
JP (2) JPS60131733A (de)
AT (1) ATE35880T1 (de)
DE (2) DE3472858D1 (de)
FR (1) FR2555808B1 (de)

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US4737681A (en) * 1986-05-21 1988-04-12 Zenith Electronics Corporation Support means for a tensioned foil shadow mask
US4939412A (en) * 1988-03-30 1990-07-03 Rca Licensing Corporation Color picture tube having improved shadow mask-frame assembly
US5029256A (en) * 1988-08-11 1991-07-02 Kabushiki Kaisha Toshiba Color cathode ray tube
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KR930000782Y1 (ko) * 1990-11-29 1993-02-25 주식회사 금성사 미스랜딩 보정유니트를 가진 칼라수상관
KR960012414B1 (ko) * 1993-07-05 1996-09-20 엘지전자주식회사 칼라수상관의 섀도우마스크 지지용 탄성부재
KR200147271Y1 (ko) * 1995-07-24 1999-06-15 손욱 마스크 프레임 구조체
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US5680004A (en) * 1995-12-28 1997-10-21 Thomson Consumer Electronics, Inc. Color picture tube having an improved shadow mask-to-frame connection
US6222309B1 (en) 1996-02-21 2001-04-24 Hitachi, Ltd. Color cathode ray tube with specific skirt portion
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JP3482872B2 (ja) 1998-05-15 2004-01-06 松下電器産業株式会社 カラー陰極線管
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JP2001216912A (ja) * 1999-03-12 2001-08-10 Nec Kansai Ltd シャドウマスク構体およびカラー陰極線管
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KR20010102331A (ko) * 1999-12-24 2001-11-15 요트.게.아. 롤페즈 인장 마스크를 포함하는 컬러 음극선관
JP2001185043A (ja) * 1999-12-28 2001-07-06 Matsushita Electric Ind Co Ltd 陰極線管
KR100683647B1 (ko) 2000-04-21 2007-02-15 삼성에스디아이 주식회사 칼라 음극선관의 텐션 마스크 프레임 조립체
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DE2713246A1 (de) * 1977-03-25 1978-10-05 Licentia Gmbh Farbwahlmaskenanordnung fuer eine farbbildkathodenstrahlroehre
BE864311A (nl) * 1978-02-24 1978-06-16 Gte Sylvania Nv Temperatuur compenserende inrichting voor de bevestiging van schaduwmasker en raam van een kleurenbeeldbuis

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Also Published As

Publication number Publication date
FR2555808A1 (fr) 1985-05-31
FR2555808B1 (fr) 1986-10-10
JPS60131732A (ja) 1985-07-13
EP0145570B1 (de) 1988-07-20
EP0143707B1 (de) 1988-05-11
DE3472858D1 (en) 1988-08-25
US4678963A (en) 1987-07-07
EP0143707A1 (de) 1985-06-05
US4638211A (en) 1987-01-20
JPS60131733A (ja) 1985-07-13
ATE35880T1 (de) 1988-08-15
DE3471201D1 (en) 1988-06-16

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