Weld-free mask support blade structure for a crt

专利摘要:
According to the present invention, the mask support members 40, 60, 70, 80, and 90 may include the first sidewalls 42, 62, 70, 82, 92, the second sidewalls 44, 64, 74, 84, and 94. One of the tabs 49, 87 formed along the edge of the rear wall receiving the respective openings 50, 88 in the side wall 42 and the ridges 69, 79, 89 formed in the first side wall in contact with the rear wall. , An improved tension mask frame assembly 10 having rear walls 44, 64, 74, 84, 94 held together preferentially by 99.
公开号:KR20040011536A
申请号:KR10-2003-7016244
申请日:2002-06-04
公开日:2004-02-05
发明作者:이스트반 고로그；마스터톤월터데이비드；부처알란위어
申请人:톰슨 라이센싱 에스.에이.；
IPC主号:

专利说明:

Non-welding mask support blade structure for cathode ray tube {WELD-FREE MASK SUPPORT BLADE STRUCTURE FOR A CRT}
[2] The cathode ray tube (CRT) includes an electron gun for generating and inducing three electron beams on the screen of the CRT. The screen is located on the inner side of the faceplate panel of the CRT and consists of an array of elements of three different color emitting phosphors. A color selection electrode, which may be a shadow mask or a focus mask, is interposed between the gun and the screen such that each electron beam hits only the phosphor elements associated with the beam.
[3] Recently, CRTs with flat screen panels are more preferred. As the CRT becomes flat, a flatter shadow mask is needed. Such flat shadow masks tend to generate vibrations or generate microphonics that adversely affect the display screen of the CRT during operation. To reduce the microphonics, the shadow mask is stretched and welded to the support member. The support members are secured to the frame to help maintain tension on the shadow mask. These types of masks that are stretched are commonly referred to as tensile shadow masks.
[4] The support members and mask frame used to support the tensile shadow mask may be conveniently constructed of a sheet metal structure welded together to provide a means for supporting the tensile mask. Fabrication of such structures often results in high labor costs and relatively high operating costs as a result of the many welding required to reinforce the support members. In addition, the welding operation exerts thermal expansion on the support members that can distort the support members that affect the placement of the mask relative to the screen. In addition, during CRT manufacture, the tensile mask-frame assembly is exposed to temperatures reaching or exceeding about 460 ° C. At this temperature, weld joints have the potential for fatigue crack initiation at high stress points.
[1] The present invention relates to a color cathode ray tube (CRT) with a tension mask, and more particularly to a tension mask assembly with a support member for connecting a tension mask to a frame.
[7] The invention will now be described by way of example with reference to the accompanying drawings.
[8] 1 is a cross-sectional view of a color cathode ray tube (CRT) with a tension mask frame assembly mounted behind a screen panel.
[9] FIG. 2 is a perspective view of the tension mask frame assembly shown in FIG. 1.
[10] 3 is a plan view of a sheet used to form the support blade structure used in the tensile mask frame of FIG.
[11] 4 is a front view of a portion of the support blade structure of FIG.
[12] FIG. 5 is a sectional view taken along line 5-5 of FIG.
[13] 6 is a perspective view of the support blade structure during assembly;
[14] 7 shows a partial end view of a first support blade structure.
[15] FIG. 8 shows a cross-sectional view of the first alternative support blade structure taken along line 8-8 of FIG. 7.
[16] 9 shows a partial front view of a second alternative support blade structure.
[17] 10 is a cross sectional view of a second alternative support blade structure taken along line 10-10 of FIG.
[18] 11 shows a partial front view of a third alternative support blade structure.
[19] 12 is a cross sectional view of a third alternative support blade structure taken along line 12-12 of FIG.
[20] 13 shows a partial front view of a fourth alternative support blade structure.
[21] 14 is a sectional view of a fourth alternative support blade structure.
[5] Accordingly, the present invention provides an improved tensile mask frame assembly for a CRT, wherein the mask support members have a back wall and side walls held together without requiring welding.
[6] Embodiments of the present invention are provided such that the rear wall and the side walls of the mask support member are attached to each other by a ridge on one wall that engages the rear wall. Alternatively, the rear wall of the support member has tabs formed along the edges, each tab each opening well received or well formed between the multiple ridges to secure the back to the sides creating a closed support member. Is accepted by. In addition, the tabs are secured to the sidewalls by engagement with the device such that any two adjacent walls become restricted and thus become a mask support member having torsional stiffness.
[22] FIG. 1 shows a colored cathode ray tube 1 with a tubular neck 4 connected by a funnel 5 and a glass envelope 2 comprising a screen panel 3. The funnel portion 5 has an internal conductive coating (not shown) that extends from the anode button 6 to the neck 4 towards the panel 3. The panel 3 comprises an observation screen 8 and a peripheral flange or side wall 9 which is sealed to the funnel part 5 by the glass frit 7. The trichromatic phosphor screen 12 is supported by the inner side of the panel 3. Screen 12 is a line screen with phosphor lines arranged in the triad, each triad including each phosphor line in three colors. The tensile shadow mask assembly 10 is removably mounted in a predetermined spaced relationship with respect to the screen 12. Electron gun 13 schematically shown by the dashed line in FIG. It is mounted centrally in the neck 4 to generate and guide accordingly.
[23] The tube 1 is designed for use with an external magnetic deflection yoke 14 shown in the vicinity of the funnel to neck junction. The yoke 14, when activated, applies three beams to a magnetic field that causes the beam to be scanned horizontally and vertically to the rectangular raster on the screen 12.
[24] The tensile shadow mask assembly 10 shown in FIG. 2 includes two long sides 22, 24 and two short sides 26, 28. The two long sides 22, 24 of the frame are parallel to the central major axis X of the tube and the two short axes 26, 28 are parallel to the central minor axis Y of the tube. Tensile shadow mask assembly 10 includes an open shadow mask 30 that includes a plurality of metal strips (not shown) that are parallel to the major axis of shadow mask 30 and have various long slits (not shown) therebetween. It includes. The intermediate support member 40 can be fastened to the frame 20 and vary in height from the center to the end of the support member 40 to allow for the best curvature and tensile compliance over the shadow mask 30.
[25] Referring to Figure 3, the intermediate support member 40 is formed from a sheet of metal that is folded along the dashed line. The sheet is configured to have a plurality of sidewalls, a first sidewall 42, a rear sidewall 46, and a rear wall 44. Angled portion 48 extends along rear wall 44. The mask receiving edge 43 is positioned along the end of the side wall extension 45. The mask receiving edge 43 may be appropriately contoured such that the shadow mask 30 matches the internal contour of the screen 12. A plurality of openings 50 are formed in the side wall 42 adjacent to the fold line for the extension 45. The back sidewall 46 extends from the side wall 42 and further extends to the back wall 44. Angled portion 48 extends from rear wall 44 and is profiled to have a plurality of tabs 49 extending along its edge.
[26] 4 shows the intermediate support member 40 in an assembled state, and FIG. 5 shows the intermediate support member 40 in a mounting position with respect to the frame 20. In assembly, the seat is folded as shown in FIG. 3 such that the side wall 42, rear side wall 46, rear wall 44 and angled portion 48 form a closed tubular structure best shown in the cross-sectional view of FIG. It is folded along the dashed line as shown in FIG. The back wall 44 is folded and pressed through the side wall 42 until the tab 49 enters the opening 50. The opening 50 is dimensioned to be received in the tab 49 in a tight fit. When the tab 49 is inserted into the opening 50 to complete the intermediate support member 40, the intermediate support member is secured to the frame 20 as shown in FIG. 5. Fasteners 52 or any other suitable support member may be used to secure intermediate support member 40 to frame 20 at thick sidewall 46. Thereafter, the shadow mask 30 is applied to the mask receiving edge 43 to complete the tensile shadow mask assembly 10. When the tension mask 30 is applied to the mask receiving edge 43, a force cantilever is applied to the extension 45, pressing the side wall 42 against the angled portion 48 so that the intermediate support member 40 Keep it in place.
[27] 7 and 8 show a first alternative embodiment of the intermediate support member 60. This first intermediate support member 60 is similar in that it has a side wall 62, a rear side wall 66 and an extension 65 extending along the side wall 62. However, the back wall 64 extends between the side walls 62 and 66 and is otherwise fixed. The rear wall does not have tabs formed along the edges as in the embodiment of Figures 3-6. Instead, a ridge 69 is formed in the sidewall 62 just below the extension 65. The ridge 69 extends along the entire length of the intermediate support member 60 and is used to contact the edge of the rear wall 64 to secure the rear wall with respect to the side wall 62. This first alternative intermediate support member 60 is similarly secured to the frame 20 and similarly receives the shadow mask 30 along the mask receiving edge 63. When the tension mask 30 is applied to the mask receiving edge 63, the force cantilever is applied to the extension 65 to press the side wall 62 against the back wall 64. Since the side wall 62 is pressed against the rear wall 64, the ridge 69 is in place to form the intermediate support member 40 in a closed tubular structure, as shown in FIG. 8. ).
[28] 9 and 10 show a second alternative embodiment of the intermediate support member 70. This second alternative intermediate support member 70 is similar in that it has a side wall 72, a rear side wall 76 and an extension 75 extending along the side wall 72. However, the back wall 74 extends between the side walls 72 and 76 and is secured to the side wall 72 in another manner. The rear wall 74 does not have tabs formed along the edges as in the embodiment of FIGS. 3 to 6. Instead, a plurality of perforated ridges 79 are formed in the sidewall 72 along the length of the rear wall just below the extension 75. The perforated ridge portion 79 is used to contact the edge of the rear wall 74 to secure the rear wall relative to the side wall 72. This second alternative intermediate support member 70 is similarly secured to the frame 20 and similarly receives the shadow mask 30 along the mask receiving edge 73.
[29] 11 and 12 show a third alternative embodiment of the intermediate support member 80. This third alternative intermediate support member 80 is similar in that it has a side wall 82, a rear side wall 86 and an extension 85 extending along the side wall 82. However, rear wall 84 extends between side wall 82 and rear side wall 86 and is secured to side wall 82 in another manner. Here, the rear wall 84 has a plurality of tabs 87 formed along the edges similar to the embodiment of FIGS. 3 to 6. A plurality of perforated ridges 89 are formed in the sidewall 82 along their length just below the extension 85. A plurality of perforated ridges 89 define openings 88 therebetween to accommodate each tab 87 along the edge of the back wall 84. The perforated ridge portion 89 is used to contact the edge of the rear wall 84 and secure the rear wall with respect to the side wall 82. This third alternative intermediate support member 80 is similarly supported to the frame 20 and similarly receives the mask 30 along the mask receiving edge 83. As in Figures 3-6, this embodiment has the sidewalls 88 and rear walls 84 under the torsional load applied to the intermediate support member 80, since the tabs 87 are fixed in the openings 88. It is advantageous in that it does not slip against each other.
[30] 13 and 14 show a fourth alternative embodiment of the intermediate support member 90. This fourth alternative intermediate support member is similar in that it has a side wall 92, a rear side wall 94 and an extension 95 extending along the side wall 92. The back wall 94, which is a separate member, extends between the side wall 92 and the back side wall 96 and is secured to the side wall 92 in another manner. Here, the rear wall 94 does not have tabs formed along the edges as in the embodiment of FIGS. 3 to 6. The first ridge 99 is formed in the side wall 92 just below the extension 95. The second ridge 97 is formed in the rear sidewall 96 adjacent the free end 90. Preferably, the ridges 97 and 99 extend along the entire length of the intermediate support member 90. It should be understood that these ridges 99, 97 may alternatively be perforated ridge portions, as shown in other embodiments. It should also be understood that the rear wall 94 may optionally have tabs formed therein to interlock between any of the perforated ridge portions selected as shown in the embodiment of FIG. This fourth alternative intermediate support member 90 is assembled by first forming a ridge 97 or ridge 99 and then inserting a rear wall 94. The other ridges 97 and 99 are then formed to secure the rear wall 94 to the side walls 92 and 96 to complete the intermediate support member 90. Alternatively, the ridges 97 and 99 may be formed to enable the rear wall 94 to be snapped in place so that the rear wall 94 is pressed therebetween and forms a closed tubular intermediate support member 90. The fourth alternative intermediate support member 90 is similarly secured to the frame 20 and similarly receives the shadow mask 30 along the mask receiving edge 93.
[31] An advantage of the present invention is that the closed tubular structure is formed of an intermediate support member without the need to weld along the structure. This significantly saves manufacturing costs and reduces the material and time required to create such a structure.
[32] The foregoing illustrates some possibilities for practicing the present invention. Many other embodiments are possible within the scope and spirit of the invention. The foregoing description, therefore, is intended to be illustrative rather than restrictive and the scope of the invention is to be given by the appended claims along with the full scope of equivalents.

权利要求:
Claims (8)
[1" claim-type="Currently amended] Intermediate supporting members 40, 60, 70, 80, 90 for mounting on the frame 20 inside the cathode ray tube 1 and for receiving the tension mask 30,
The first side walls 42, 62, 70, 82, 92,
Second side walls 46, 66, 76, 86, 96 extending from the first side wall,
Rear walls 44, 64, 74, 84, 94 having a plurality of tabs 49, 87 extending from the second sidewall and formed along the edge,
And a plurality of openings (50, 88) extending along at least a portion of the first sidewall to receive the tabs to form a closed structure.
[2" claim-type="Currently amended] Further comprising an extension (45, 65, 75, 85, 95) extending from the first sidewall and having tension mask receiving edges (43, 63, 73, 83, 93). And a mask helps to press the first side wall towards the rear wall.
[3" claim-type="Currently amended] A single intermediate support member 40, 60, 70, 80, 90 for mounting on the mask frame 20 for the cathode ray tube 1 and for receiving the tension mask 30,
The first side walls 42, 62, 70, 82, 92,
Second side walls 46, 66, 76, 86, 96 extending from the first side wall,
Rear walls 44, 64, 74, 84, 94 extending from the second sidewall,
And a ridge (69, 89, 99) extending along at least a portion of the first side wall to contact the first side wall and the first side wall forming a closed structure.
[4" claim-type="Currently amended] 4. The single intermediate support member of claim 3 wherein the ridge comprises a plurality of perforations (89) forming a plurality of openings (88).
[5" claim-type="Currently amended] 5. A single intermediate support member according to claim 4, wherein the rear wall further comprises a plurality of tabs (87) each fitted with respective openings (88) between perforations.
[6" claim-type="Currently amended] Mask frame assembly 10 having support members 40, 60, 70, 80, 90 for CRT 1,
The support member includes first side walls 42, 62, 70, 82, 92, second side walls 46, 66, 76, 86, 96 and rear walls 44, 64, 74, forming a closed channel therebetween. 84, 94, wherein at least one of the sidewalls further comprises ridges 69, 79, 89, 99 extending along at least a portion of the at least one sidewall, and the rear wall is a distal end fixed by the ridge. Mask frame assembly, characterized in that having a.
[7" claim-type="Currently amended] 7. The mask frame assembly of claim 6, wherein the support member further comprises a second ridge (97) formed on the other of the side walls.
[8" claim-type="Currently amended] 8. The mask frame assembly of claim 7, wherein the back wall is secured to the side walls by being located under both ridges.

类似技术:

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KR970008561B1|1997-05-27|Color cathode-ray tube

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EP0121628A1|1984-10-17|Cathode-ray tube having taut shadow mask

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US4491763A|1985-01-01|Color picture tube with shadow mask supporting members

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JP3927826B2|2007-06-13|CRT with vibration damping part for tension mask

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US4072876A|1978-02-07|Corrugated shadow mask assembly for a cathode ray tube

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KR20010006307A|2001-01-26|Color crt having a support frame assembly with detensioning means

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US4173729A|1979-11-06|Cathode-ray tube having a stepped shadow mask

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EP0278709B1|1991-09-04|Cathode ray-tube having shadow mask for low overscan

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US4572983A|1986-02-25|Color picture tube having an improved support structure for a color selection electrode

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US4146816A|1979-03-27|Cathode-ray tube with a corrugated mask having a corrugated hinging skirt

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US3487251A|1969-12-30|Parallelogram mounting fixture for shadow mask

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HU0302315A2|2007-01-29|Compliant tension mask assembly

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US6630776B2|2003-10-07|Color cathode ray tube

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US6781297B2|2004-08-24|Method and apparatus for maintaining mask strand spatial uniformity

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US5424603A|1995-06-13|Color selection means for color display tubes

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JP3746425B2|2006-02-15|Color picture tube with tensioning mask-support frame assembly

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US4122368A|1978-10-24|Cathode ray tube with a corrugated mask having a corrugated skirt

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US20020190629A1|2002-12-19|Flat mask for cathode ray tube

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US20020011772A1|2002-01-31|Color cathode ray tube

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2001-06-13|Priority to US09/880,196

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2001-06-13|Priority to US09/880,196

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2002-06-04|Application filed by 톰슨 라이센싱 에스.에이.

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2002-06-04|Priority to PCT/US2002/017648

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2004-02-05|Publication of KR20040011536A

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2008-12-22|Application granted

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2008-12-22|Publication of KR100875322B1

优先权:

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申请号 | 申请日 | 专利标题

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US09/880,196|2001-06-13|

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US09/880,196|US6683401B2|2001-06-13|2001-06-13|Weld-free mask support blade structure|

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PCT/US2002/017648|WO2002101782A2|2001-06-13|2002-06-04|Weld-free mask support blade structure for a crt|