EP0644571A2 - Farbbildröhre mit Schattenmaskerahmenträger - Google Patents

Farbbildröhre mit Schattenmaskerahmenträger Download PDF

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Publication number
EP0644571A2
EP0644571A2 EP94114353A EP94114353A EP0644571A2 EP 0644571 A2 EP0644571 A2 EP 0644571A2 EP 94114353 A EP94114353 A EP 94114353A EP 94114353 A EP94114353 A EP 94114353A EP 0644571 A2 EP0644571 A2 EP 0644571A2
Authority
EP
European Patent Office
Prior art keywords
plate
spring
panel
support means
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.)
Granted
Application number
EP94114353A
Other languages
English (en)
French (fr)
Other versions
EP0644571B1 (de
EP0644571A3 (de
Inventor
Raymond Edward Keller
Neil Edward Sies
Joseph John Piascinski
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.)
Technicolor USA Inc
Original Assignee
Thomson Consumer Electronics Inc
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 Thomson Consumer Electronics Inc filed Critical Thomson Consumer Electronics Inc
Publication of EP0644571A2 publication Critical patent/EP0644571A2/de
Publication of EP0644571A3 publication Critical patent/EP0644571A3/de
Application granted granted Critical
Publication of EP0644571B1 publication Critical patent/EP0644571B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • This invention relates to color picture tubes of the type having a shadow mask attached to a peripheral frame which is suspended in relation to a cathodoluminescent screen comprising blue-emitting, green-emitting and red-emitting phosphor elements and, more particularly, to improved means for supporting a mask-frame assembly in such a tube so that electron beams, generated by an electron gun, impinge upon the proper phosphor elements.
  • a peripheral frame, supporting a shadow mask is suspended in a faceplate panel by means of springs that are welded either directly to the frame or to plates which in turn are welded to the frame.
  • the springs are usually made of bimetallic materials; and in the plate version, the plates are bimetallic.
  • the springs or plates become heated by transfer of heat from the mask through the frame, the bimetallic materials expand differently, thereby bending the springs or plates to cause movement of the mask-frame assembly toward a screen disposed on the panel. It is also known to use the geometric structure of the springs to cause this same motion towards the screen by action of the force of the expanding mask-frame assembly against the springs.
  • a problem with the above-described structures for the plate version is that it is difficult to nondestructively evaluate the quality of the welds used to attach the springs to the plates, and the plates to the frame.
  • Defective welds may fail due to thermal or mechanical shock, and the welding operation may generate weld splash, i.e., metal particles expelled from the weld area, because of improper contact between the parts to be joined together and the welding electrodes.
  • the weld splash particles may become dislodged within the sealed tube and cause either cosmetic or electrical problems.
  • Another weld-associated problem is that, if the parts to be joined are not flush, a weld nugget is formed between the parts and may act as a pivot point possibly causing weld failure or a relative rotation of the parts and the shadow mask under shock loading. Such a condition results in a misregister between the apertures in the shadow mask and the phosphor elements of the cathodoluminescent screen, thereby causing the electron beams to impinge upon areas of the screen other than the intended areas.
  • An improved color picture tube includes an evacuated glass envelope having a faceplate panel with a cathodoluminescent screen disposed thereon.
  • the panel includes a color selection electrode assembly mounted therein by support means that are located at peripherally spaced positions within the panel.
  • the support means at each of the spaced positions includes a stud attached to the glass envelope, a spring having an opening therein for engaging the stud, and a plate welded between the spring and the color selection electrode assembly.
  • the improvement comprises mechanically joining the spring and the plate by extrusions interlocking the parts together at two spaced-apart locations along one edge of the parts.
  • Fig. 1 shows a rectangular color picture tube 8 having a glass envelope 10, comprising a rectangular faceplate panel 12 and a tubular neck 14 connected by a rectangular funnel 16.
  • the panel 12 comprises a viewing faceplate 18 and a peripheral flange or sidewall 20 which is sealed to the funnel 16.
  • the faceplate panel 12 includes two orthogonal axes: a major axis X-X, parallel to its wider dimension (usually horizontal), and a minor axis Y-Y, parallel to its narrower dimension (usually vertical).
  • the major and minor axes are perpendicular to the central longitudinal axis Z-Z of the tube which passes through the center of the neck 14 and the center of the panel 12.
  • the screen preferably is a line screen with the phosphor lines extending substantially parallel to the minor axis Y-Y. Alternatively, the screen may be a dot screen.
  • a multiapertured color selection electrode, or shadow mask, 24 is removably mounted, by improved means, in predetermined spaced relation to the screen 22.
  • An electron gun 26 is centrally mounted within the neck 14, to generate and direct three electron beams along convergent paths through openings in a curved, apertured portion 25 of the mask 24, to the screen 22.
  • the tube of Fig. 1 is designed to be used with an external magnetic deflection yoke, such as the yoke 28, located in the neighborhood of the funnel-to-neck junction.
  • an external magnetic deflection yoke such as the yoke 28, located in the neighborhood of the funnel-to-neck junction.
  • the yoke 28 subjects the three beams to magnetic fields which cause the beams to scan horizontally and vertically in a rectangular raster over the screen 22.
  • the shadow mask 24 is part of a mask-frame assembly 30 that also includes a peripheral shadow mask frame 32.
  • the mask-frame assembly 30 is shown positioned within the faceplate panel 12 in Figs. 1 and 2.
  • the mask-frame assembly 30 is mounted to the panel 12 by four improved support means 34 shown in Figs. 2, 3 and 4.
  • the shadow mask 24 includes the curved apertured portion 25, an imperforate border portion 27 surrounding the apertured portion 25, and a skirt portion 29 bent back from the border portion 27 and extending away from the screen 22.
  • the skirt portion 29 of the mask 24 is telescoped within or set inside the frame 32 and welded to the inside surface thereof.
  • the support means 34 are located at peripherally spaced positions of the mask-frame assembly 30 and the panel 12.
  • Each support means 34 includes a stud 44, a spring 46 and a plate 48.
  • Each stud 44 is a conically-shaped metal member that is attached to the panel sidewall 20, for example, along the major and minor axes in a 26V tube having a diagonal dimension of 66cm.
  • An aperture 60 in the spring 46 engages the free end of the stud 44.
  • the plate 48 is a bimetallic element comprising a first metal layer 48a and a second metal layer 48b laminated or otherwise bonded together in face-to-face relation.
  • the spring 46 is in contact with and attached to the first metal layer 48a of the plate 48, and the second metal layer 48b is attached to the frame 32.
  • the bimetal materials of the plate 48 are chosen so that, when heated, the plate moves toward the frame and displaces the mask-frame assembly 30 towards the screen 22.
  • the coefficient of thermal expansion of the metal layer 48b next to the frame must be lower than the coefficient of expansion of the layer 48a attached to the spring.
  • the spring 46 is attached to the plate 48 not by welding, but by mechanically joining the components together using extrusions which interlock the components along facing surfaces.
  • the extrusions are formed at two spaced apart locations 50 and 51 along one edge 52 of the joined parts.
  • a cross section of an interlocking extrusion is shown in Fig. 4.
  • the centers of the extrusions are spaced about 19.05 mm (0.750 inch) apart and about 4.78 mm (0.188 inch) from the edge 52 of the joined parts.
  • the other end of the plate 48 is attached to the frame 32 by conventional welding, or by utilizing extrusions of the type described. Attachment points 53, 54, shown in Fig.
  • the lateral spacing, A, between the attachment locations 50, 51 and points 53, 54 is about 22.20 mm (0.874 inch), to provide adequate room for movement of the plate 48 to achieve temperature compensation.
  • the interlocking extrusions at locations 50, 51 may be formed using conventional clinching devices, such as are available from Tech-Line Engineering Co., Warren, Michigan or from BTM Corp., Marysville, Michigan.
  • interlocking extrusion over conventional attachment means, such as welding or riveting, are the elimination of weld splash, the ability to non-destructively inspect the quality of the closures, the high degree of accuracy of the location of the closures, the elimination of pre-forming holes for rivets, and the elimination of additional parts which are required by riveting.
  • a drawback of the interlocking extrusion is that it possesses only about 70 percent of the strength of a "good" weld of equivalent nugget size; however, by slightly increasing the nugget size of the extrusion, comparable closure strength can be achieved.
  • An unexpected advantage of the interlocking extrusion is the improvement in shock test and static load test results for a panel having a shadow mask assembly mounted therein utilizing the novel interlocking extrusion for attaching together the associated springs 46 and plates 48.
  • Shock tests were conducted on twelve test panel assemblies made with the interlocking extrusions at locations 50 and 51. The test assemblies were evaluated versus eight conventional (control) panel assemblies in which the springs were welded to the plates. Both the test and control assemblies had the plates welded to the frame of the shadow mask assembly.
  • the panels were prepared using a conventional matrix process such as that described in U.S. 4,049,452, issued to Nekut on Sept. 20, 1977.
  • a photoresist solution the solubility of which is altered when it is exposed to light, was deposited on the interior surface of the panel and dried.
  • the shadow mask assembly was placed in the panel, and light from a lighthouse was projected through the apertures in the mask to expose selected areas of the photoresist.
  • the lighthouse in this instance, directed the light at an angle identical to the angle that the electron beams, which impinge on the green-emitting phosphor elements, would take.
  • the mask assembly was removed from the panel, and the unexposed, more soluble portions of the photoresist were removed by washing.
  • a solution of light absorbing matrix material was deposited on the bare area of the panel and on the retained areas of exposed photoresist.
  • the matrix solution was dried and then etched with a suitable etchant, which softened and removed the underlying retained areas of the photoresist and the overlying matrix material, leaving light absorbing matrix material on the majority of the panel, with clear windows formed in the locations previously occupied by the underlying retained areas of photoresist and overlying matrix material.
  • the windows in the matrix provide a way to measure register shift.
  • the panels were then shocked by a drop test that provided a 35G shock to the panel with the shadow mask assembly supported therein. G is the gravitational force.
  • the panel assemblies were shocked with the panel in the usual viewing orientation, identified in TABLE 1 as "Y", and with the panel assembly face down, "FD", and also face up, "FU". Separate panels were used for each test. Prior to the shock test, the panel assemblies were thermally stress cycled by passing them through a stabilizing furnace operating at a temperature of 450 ⁇ 15 o C.
  • the recorded measurements were taken by projecting light from the same lighthouse, used for forming the windows in the matrix, through the mask assembly and windows, and then measuring the amount of displacement or "misregister" due to the 35G shock.
  • the recorded values are in micrometers ( ⁇ ); and the smaller the absolute value of the displacement, the lower the register shift.
  • the plus (+) and minus (-) designations refer to shifts in one direction or the other.
  • a comparison of the register shifts for control and test panels dropped with the panel assembly in the usual viewing orientation (Y) reveals that, in the center, the test panels and the control panels had the same amount of misregister. But, at the 2D, 3:00, 4D, 9:00 and 10D locations, the absolute value of the misregister ranged from 2 to 5 ⁇ less for the test panels, while, at the 8D location, the average test panel had 5 ⁇ greater misregister than the controls. On average, the test panels experienced less overall misregister than did the control panels for the Y orientation shock test.
  • the drop test results In the face up (FU) position, the drop test results also favored the test panels, with less misregister in the center and at the 2D, 3:00 and 4D locations, but slightly greater misregister than the control panels at the 8D, 9:00 and 10D locations. In the face down test (FD), the test panels fared worse than the control panels, but all performed poorly.
  • test tubes T13 and T14 were mechanically joined by the novel extrusion interlocking the parts.
  • the plates and springs of the control tubes, C11 and C12 were joined by conventional welding.
  • the plates of both the test and control tubes were welded to the shadow mask frame, as described above for the shock test tubes.
  • the interlocked plates and springs of test tubes T13 and T14 offered more resistance to displacement or misregister than did the welds of the control tubes. This is concluded by comparing the maximum displacements at a non-contacted corner (10D), as the static load is increased from 40 to 55 pounds at the 2D corner.
  • a 45 pound test load simulates the forces on the mask-frame assembly, if the panel with the mask-frame assembly mounted thereon is mishandled during manufacturing and the mask frame is contacted.
  • each support means 34' includes a stud 44', a spring 46' and a plate 48'. Each plate 48' is welded near one end at a truncated corner of the frame 32'.
  • the welds may be conventional, or a pair of novel extrusions at points 53' and 54', which interlock the frame 32' to the plates 48', may be used.
  • the spring 46' is attached at one of its ends to the other end of the plate 48' by extrusions at locations 50' and 51', which interlock the parts together in the manner shown in Fig. 4, for the first embodiment.
  • the spring 46' includes an aperture 60' near its free end, which engages the conical portion of the stud 44'.
  • the plate 48' is of laminated bimetal construction, as shown in Fig. 6.
  • One metal layer 48a', facing the frame 32', is a high thermal expansion material
  • the other metal layer 48b', facing the spring 46' is a low thermal expansion material.
  • the spring 46' and the plate 48' each provide a contribution to the compensation necessary to move the mask-frame assembly 30' relative to the screen, to compensate for thermal expansion of the mask 24' during tube operation.
  • the extent of the contributions of the spring and the plate is described in U.S. Pat. No. 5,063,325, issued to Ragland, Jr. on Nov. 5, 1991.

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  • Electrodes For Cathode-Ray Tubes (AREA)
EP94114353A 1993-09-21 1994-09-13 Farbbildröhre mit Schattenmaskerahmenträger Expired - Lifetime EP0644571B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12418393A 1993-09-21 1993-09-21
US124183 1993-09-21

Publications (3)

Publication Number Publication Date
EP0644571A2 true EP0644571A2 (de) 1995-03-22
EP0644571A3 EP0644571A3 (de) 1995-08-30
EP0644571B1 EP0644571B1 (de) 1997-06-18

Family

ID=22413305

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94114353A Expired - Lifetime EP0644571B1 (de) 1993-09-21 1994-09-13 Farbbildröhre mit Schattenmaskerahmenträger

Country Status (11)

Country Link
EP (1) EP0644571B1 (de)
JP (1) JP3083709B2 (de)
KR (1) KR0150506B1 (de)
CN (1) CN1080449C (de)
CA (1) CA2132187C (de)
CZ (1) CZ284014B6 (de)
DE (1) DE69403873T2 (de)
MY (1) MY111237A (de)
RU (1) RU2089006C1 (de)
SG (1) SG52296A1 (de)
TW (1) TW341378U (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6069437A (en) * 1996-06-20 2000-05-30 Kabushiki Kaisha Toshiba Thermal deformation member for electron tube and color picture tube using thereof, and thermal deformation member for electric current control and circuit breaker and using thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100402736B1 (ko) * 1996-07-31 2003-12-18 삼성에스디아이 주식회사 음극선관용훅스프링및그고정방법
AU3962899A (en) * 1998-04-30 1999-11-23 Svyatoslav Ivanovich Arsenich Shadow-mask colour kinescope

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803436A (en) * 1965-07-16 1974-04-09 A Morrell Shadow mask mounting assemblies
JPS58111242A (ja) * 1981-12-25 1983-07-02 Hitachi Ltd シヤドウマスク保持用スプリング
US4663561A (en) * 1984-09-29 1987-05-05 Standard Elektrik Lorenz Ag Color picture tube with shadow mask mounting means
US4950941A (en) * 1989-07-21 1990-08-21 Rca Licensing Corporation Color picture tube having improved shadow mask-frame assembly support
EP0446792A2 (de) * 1990-03-16 1991-09-18 Thomson Consumer Electronics, Inc. Farbbildröhre mit Schattenmaske/Rahmenträger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803436A (en) * 1965-07-16 1974-04-09 A Morrell Shadow mask mounting assemblies
JPS58111242A (ja) * 1981-12-25 1983-07-02 Hitachi Ltd シヤドウマスク保持用スプリング
US4663561A (en) * 1984-09-29 1987-05-05 Standard Elektrik Lorenz Ag Color picture tube with shadow mask mounting means
US4950941A (en) * 1989-07-21 1990-08-21 Rca Licensing Corporation Color picture tube having improved shadow mask-frame assembly support
EP0446792A2 (de) * 1990-03-16 1991-09-18 Thomson Consumer Electronics, Inc. Farbbildröhre mit Schattenmaske/Rahmenträger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007 no. 218 (E-200) ,28 September 1983 & JP-A-58 111242 (HITACHI SEISAKUSHO KK) 2 July 1983, *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6069437A (en) * 1996-06-20 2000-05-30 Kabushiki Kaisha Toshiba Thermal deformation member for electron tube and color picture tube using thereof, and thermal deformation member for electric current control and circuit breaker and using thereof
US6188172B1 (en) 1996-06-20 2001-02-13 Kabushiki Kaisha Toshiba Color picture tube using a thermal deformation member
SG94336A1 (en) * 1996-06-20 2003-02-18 Sony Corp Thermal deformation member for electron tube and color picture tube using thereof, and thermal deformation member for electric current control and circuit breaker using thereof

Also Published As

Publication number Publication date
CA2132187C (en) 1999-12-28
RU94033987A (ru) 1997-05-27
CN1104803A (zh) 1995-07-05
CN1080449C (zh) 2002-03-06
EP0644571B1 (de) 1997-06-18
TW341378U (en) 1998-09-21
MY111237A (en) 1999-09-30
SG52296A1 (en) 1998-09-28
CA2132187A1 (en) 1995-03-22
RU2089006C1 (ru) 1997-08-27
JP3083709B2 (ja) 2000-09-04
CZ214594A3 (en) 1995-04-12
DE69403873D1 (de) 1997-07-24
JPH07169407A (ja) 1995-07-04
DE69403873T2 (de) 1997-10-16
KR950009859A (ko) 1995-04-26
CZ284014B6 (cs) 1998-07-15
EP0644571A3 (de) 1995-08-30
KR0150506B1 (ko) 1998-10-01

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