US3772555A - Color cathode ray tube of the shadow mask variety - Google Patents

Color cathode ray tube of the shadow mask variety Download PDF

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Publication number
US3772555A
US3772555A US00239516A US3772555DA US3772555A US 3772555 A US3772555 A US 3772555A US 00239516 A US00239516 A US 00239516A US 3772555D A US3772555D A US 3772555DA US 3772555 A US3772555 A US 3772555A
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United States
Prior art keywords
frame
face
shadow mask
wall
indentations
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.)
Expired - Lifetime
Application number
US00239516A
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English (en)
Inventor
L Mckee
H Roeber
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GTE Sylvania Inc
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GTE Sylvania 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 GTE Sylvania Inc filed Critical GTE Sylvania Inc
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Publication of US3772555A publication Critical patent/US3772555A/en
Assigned to NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP. reassignment NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP. ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981. (SEE DOCUMENT FOR DETAILS). Assignors: GTE PRODUCTS CORPORATION A DE CORP.
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Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • 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
    • H01J2229/0727—Aperture plate
    • H01J2229/0766—Details of skirt or border
    • H01J2229/0772—Apertures, cut-outs, depressions, or the like

Definitions

  • a shadow mask for a color cathode ray tube has a rectangular, relatively rigid, lightweight frame with an inwardly extending flange having attached thereto a circumferential side wall having a constant height.
  • a foraminated relatively fragile face with a solid skirt portion having a portion thereof formed to provide a rectangular peripheral wall with four sides extending from the face is attached to the frame. Attachment is by means of welds between the peripheral skirt wall and the side wall of the frame.
  • the four sides of the peripheral wall have a planar termination whereby the height of any one of the side walls isvcontinuously variable when measured from adjacent points of the termination to the curved face.
  • Color tubes of the type delineated above are in common usage and generally comprise a faceplate portion of glass having a patterned phosphor screen thereon and a plurality of electron guns for emitting streams of electrons which impinge on the patterned phosphors to cause selective color illumination.
  • a shadow mask is positioned between the phosphor screen and'the electron guns.
  • This mask comprises a foraminated portion whose apertures are specifically aligned with the patterned phosphors on the screen.
  • Such construction is well known. It has long been a desire to provide a frameless mask in this type of tube. Such a proposal was described in US. Pat. No. 2,690,518 and much later in U.S. Pat. No. 3,479,546. Both of these patents related to shadow masks which did not utilize a frame. However, neither of these various embodiments has ever been practically successful. Nevertheless, disadvantages continue to exist when a relatively heavy frame is utilized to support the very fragile foraminous mask. These disadvantages are that the heavy frame, of course, adds considerable weight to the tube and further acts as a heat sink during fabrication of the tube and during operation thereof.
  • one of the disadvantages of the heavy frame occurs during required drop testing of finished color television receivers.
  • a mask with a heavy frame is liable to pitch forward with such velocity that the welds which affix the supporting springs to the frame are broken.
  • problems occur during operation of the tube if, for example, a peculiar pattern is generated on the tube which requires that the full energy of all three electron beams be directed at a selected or confined area of the mask for extended periods of time.
  • the fragile mask is very apt to buckle and become permanently distorted. This is due, primarily, to the difference in thermal expansion between the mask area and the heavy frame.
  • the frameless mask type of construction would avoid this problem; however, as has been stated above, such frameless masks inherently have other problems such as lack of sufficient rigidity and difficulty in manufacture.
  • a shadow mask which has a relatively rigid light weight frame of substantially rectangular configuration and which is formed to provide an inwardly extending flange having an attached side wall thereabout, which side wall has a constant height. At least three areas of indentation can be formed in the side wall, one each being formed in the short sides and one in the long side of the frame. Support springs of known design and configuration are attached to the frame within the provided indentations.
  • a relatively fragile, curved, foraminated face is provided which has a solid or imperforate skirt surrounding the face. A portion of the skirt is formed to provide a rectangular peripheral upstanding wall having four sides extending from the face and joined at the comers thereof.
  • the four sides of the upstanding wall have a planar termination whereby the height of any one of the side walls is continuously variable when measured from adjacent points of the termination to the curved face.
  • the peripheral wall of this foraminated face fits over the outside of the frame side wall and is attached thereto by a plurality of welds.
  • FIG. 1 is an exploded perspective view of a prior type color cathode ray tube
  • FIG. 2 is an exploded perspective view of a later type of prior art shadow mask
  • FIG. 3 is an exploded perspective view of a shadow mask incorporating the improvements of this invention.
  • FIG. 4 is a perspective detail of a spring mounting arrangement
  • FIG. 5 is an elevational view of an assembled mask and frame of the invention.
  • FIG. 1 a shadow mask 10 comprising a circular frame 12 and a foraminated face 14.
  • the face 14 has a peripheral circumferential wall 16 having a constant height which engages an upstanding wall 18 on the frame 12.
  • This circular structure was the basic tube for many years until replaced by the rectangular variety now in'use.
  • the mask 20 comprises a rectangular frame 22 and a foraminated face 24.
  • the frame in this instance has upstanding walls 25, the terminal portions 26 of which are curved to conform to the configuration of foraminated face 24.
  • the face 24 has an upstanding wall 28 which, again, is of constant height.
  • the face 24 and side walls 28 are fitted over the side walls 25 of frame 22 and are affixed thereto as by a plurality of welds.
  • the side walls of the frame act as the side walls of the face portion. That is, they provide a very rigid structure with the face portion being restricted in its ability to expand or contract because of the severe attachment of the peripheral wall of the face with the side walls of the frame. It is this restriction of movement which led to the buckling problems of the prior art structures.
  • a shadow mask 30 having a frame 32, of substantially rectangular configuration, which is relatively rigid yet of light weight and a foraminated face 33.
  • the frame 32 has an inwardly projecting flange 34 which has attached thereto a circumferential side wall 36 having a constant height.
  • Elongated indentations 38 are provided in the side wall, generally three in number, with two being oppositely positioned in the short sides of the frame and one in the long side. Support springs for releasably holding the mask within the tube are affixed in these areas as will be explained hereinafter.
  • the foraminated face 33 is relatively fragile and is formed with a curved surface 40 surrounded by a solid skirt 42.
  • a portion of skirt 42 is formed to provide a rectangular, peripheral, upstanding wall 44 having four sides extending from the face 33 and joined at the corners thereof.
  • the four sides of the wall 44 have a planar termination 46 remote from the foraminated face 33.
  • This construction provides for walls whose height is continuously variable when measured from adjacent points of the termination 46 to the curved face 33. Since the face is symmetrically curved about a centerline 47 (see FIG. it is obvious that the height variation discussed above occurs when both measuring points are on the same side of the centerline.
  • a plurality of leaf springs 48 are attached to the side wall 36 of frame 32 within indentations 38, as by welding. These indentations 38 have a depth substantially corresponding to the thickness of the springs; however, this relationship is exaggerated in FIG. 4 for clarity.
  • the springs 48 have a flat area 50 which is in contact with the frame and have an outwardly angled area 52 which extends away from the frame.
  • the distal ends 54 of springs 48 are provided with apertures 56 as is conventional in the art.
  • the sides 44 of face 33 fit over the side wall 36 of frame 32 and are provided with slots 58 to encompass the attached portions of springs 48.
  • the slots have an overlying edge 60 which lies on top of attached flat area 50 and an underlying edge 62 which lies under the angled area 52.
  • the edges of the slots 58 can be provided with an angled entry to facilitate assembly.
  • a detail of the spring-mask assembly can be seen in FIG. 4.
  • sides 44 to side 36 of frame 32 is accomplished by a plurality of welds 64 substantially equally spaced about the periphery of the mask. Further, the welds 64 are substantially the height above the flange 34 of frame 32, a definite advantage in manufacture.
  • edge 60 is usually welded to flat area 50 of spring 48 and edge 62 is welded directly to frame wall 36. Further, it may be necessary that the latter two welds not be aligned with welds 64.
  • the foraminated face with the planar termination of its side walls is stronger and easier to handle in assembly than its predecessor, which, before attachment to a frame, could only support itself on four corners (See FIG. 2).
  • the novel frame provides sufficient rigidity yet is much lighter in weight than those of the prior art.
  • a shadow mask for a color cathode ray tube said shadow mask having increased tolerance to permanent deformation caused by heat generated by impingement of an electron beam in a confined area for extended period of time, and comprising: a relatively rigid light weight frame of substantially rectangular configuration being formed to provide an inwardly extending flange having an attached side wall thereabout having a constant height; at least three areas of indentations formed in said side wall, one each being formed in the short sides and one in the long side of said frame; and a relatively fragile portion having a curved foraminated face and a solid skirt surrounding said face, a portion of said skirt being formed to provide a rectangular, peripheral, upstanding wall having four sides extending from said face and joined at the corners thereof, said four sides of said wall having a planar termination whereby the height of any one of said side walls is continuously variable when measured from adjacent points of said termination to said curved face, said peripheral wall of said foraminated face fitting over the outside of said frame side wall and being attached thereto by a plurality of

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  • Electrodes For Cathode-Ray Tubes (AREA)
US00239516A 1972-03-30 1972-03-30 Color cathode ray tube of the shadow mask variety Expired - Lifetime US3772555A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23951672A 1972-03-30 1972-03-30

Publications (1)

Publication Number Publication Date
US3772555A true US3772555A (en) 1973-11-13

Family

ID=22902507

Family Applications (1)

Application Number Title Priority Date Filing Date
US00239516A Expired - Lifetime US3772555A (en) 1972-03-30 1972-03-30 Color cathode ray tube of the shadow mask variety

Country Status (4)

Country Link
US (1) US3772555A (enrdf_load_stackoverflow)
BE (1) BE797489A (enrdf_load_stackoverflow)
DE (1) DE2315353A1 (enrdf_load_stackoverflow)
FR (1) FR2178228B3 (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872345A (en) * 1972-10-27 1975-03-18 Hitachi Ltd Colour picture tubes
EP0004245A1 (fr) * 1978-03-13 1979-09-19 Videocolor Tube à masque pour la télévision en couleurs
US4327307A (en) * 1979-03-19 1982-04-27 North American Philips Consumer Electronics Corp. Shadow mask for color cathode ray tube
US4437036A (en) 1981-10-23 1984-03-13 Rca Corporation Cathode-ray tube having a temperature compensated mask-frame assembly
US4565945A (en) * 1983-05-11 1986-01-21 North American Philips Consumer Electronics Corp. Deflection limiting means for CRT mask support means
US4645968A (en) * 1984-05-15 1987-02-24 Rca Corporation Vibration control of color picture tube shadow mask
DE3919674A1 (de) * 1989-06-16 1990-12-20 Nokia Unterhaltungselektronik Masken-rahmen-kombination fuer eine farbbildroehre
US5218265A (en) * 1989-06-16 1993-06-08 Nokia (Deutschland) Gmbh Combined mask-frame with double spot welds
WO1998048438A1 (en) * 1997-04-18 1998-10-29 Thomson Consumer Electronics, Inc. Color crt and method of operating
US6278232B1 (en) 1996-03-11 2001-08-21 Hitachi, Ltd. Color cathode ray tube
US6307310B1 (en) 1996-09-17 2001-10-23 Hitachi, Ltd. Color cathode-ray tube
EP1069592A3 (en) * 1999-07-16 2002-01-02 VIDEOCOLOR S.p.A. Cathode ray tube having a multifunction frame/mask support
US6396203B1 (en) * 1997-07-24 2002-05-28 Nec Corporation Color shadow mask assembly with increased resistance to heat and vibration
US6483233B1 (en) * 1998-11-11 2002-11-19 Nec Corporation Color cathode-ray tube with expanded effective display area
US6518695B2 (en) * 1999-03-29 2003-02-11 Samsung Sdi Co., Ltd. Mask-frame assembly for cathode ray tube
EP1369893A1 (en) * 2002-06-07 2003-12-10 LG. Philips Displays Korea Co., Ltd. Shadow mask for cathode ray tube
US20100244645A1 (en) * 2009-03-27 2010-09-30 Ricoh Company, Limited Frame that supports a housing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4593225A (en) * 1984-08-31 1986-06-03 Zenith Electronics Corporation Tension mask colar cathode ray tube

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3349272A (en) * 1965-12-16 1967-10-24 Philips Corp Color television tube with shadow mask provided with electron shielding plate coated with heat radiating material
US3449612A (en) * 1968-04-24 1969-06-10 Sylvania Electric Prod Color cathode ray tube having shadow mask frame formed to accommodate a support system
US3454813A (en) * 1968-09-12 1969-07-08 Admiral Corp Mask-frame captivator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3349272A (en) * 1965-12-16 1967-10-24 Philips Corp Color television tube with shadow mask provided with electron shielding plate coated with heat radiating material
US3449612A (en) * 1968-04-24 1969-06-10 Sylvania Electric Prod Color cathode ray tube having shadow mask frame formed to accommodate a support system
US3454813A (en) * 1968-09-12 1969-07-08 Admiral Corp Mask-frame captivator

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872345A (en) * 1972-10-27 1975-03-18 Hitachi Ltd Colour picture tubes
EP0004245A1 (fr) * 1978-03-13 1979-09-19 Videocolor Tube à masque pour la télévision en couleurs
US4308485A (en) * 1978-03-13 1981-12-29 Videocolor, S. A. Shadow mask support in a color cathode ray tube
US4327307A (en) * 1979-03-19 1982-04-27 North American Philips Consumer Electronics Corp. Shadow mask for color cathode ray tube
US4437036A (en) 1981-10-23 1984-03-13 Rca Corporation Cathode-ray tube having a temperature compensated mask-frame assembly
US4565945A (en) * 1983-05-11 1986-01-21 North American Philips Consumer Electronics Corp. Deflection limiting means for CRT mask support means
US4645968A (en) * 1984-05-15 1987-02-24 Rca Corporation Vibration control of color picture tube shadow mask
DE3919674A1 (de) * 1989-06-16 1990-12-20 Nokia Unterhaltungselektronik Masken-rahmen-kombination fuer eine farbbildroehre
US5218265A (en) * 1989-06-16 1993-06-08 Nokia (Deutschland) Gmbh Combined mask-frame with double spot welds
US6518696B2 (en) 1996-03-11 2003-02-11 Hitachi, Ltd. Color cathode ray tube with shadow mask and mask frame having round corners
US6278232B1 (en) 1996-03-11 2001-08-21 Hitachi, Ltd. Color cathode ray tube
US6307310B1 (en) 1996-09-17 2001-10-23 Hitachi, Ltd. Color cathode-ray tube
US5932957A (en) * 1997-04-18 1999-08-03 Thomson Consumer Electronics, Inc. Cathode-ray tube having detentioning rod assembly for a tension mask frame
WO1998048438A1 (en) * 1997-04-18 1998-10-29 Thomson Consumer Electronics, Inc. Color crt and method of operating
US6396203B1 (en) * 1997-07-24 2002-05-28 Nec Corporation Color shadow mask assembly with increased resistance to heat and vibration
US6483233B1 (en) * 1998-11-11 2002-11-19 Nec Corporation Color cathode-ray tube with expanded effective display area
US6518695B2 (en) * 1999-03-29 2003-02-11 Samsung Sdi Co., Ltd. Mask-frame assembly for cathode ray tube
EP1069592A3 (en) * 1999-07-16 2002-01-02 VIDEOCOLOR S.p.A. Cathode ray tube having a multifunction frame/mask support
EP1369893A1 (en) * 2002-06-07 2003-12-10 LG. Philips Displays Korea Co., Ltd. Shadow mask for cathode ray tube
US20030227244A1 (en) * 2002-06-07 2003-12-11 Yong-Kun Kim Cathode ray tube
US6833660B2 (en) 2002-06-07 2004-12-21 Lg. Philips Displays Korea Co., Ltd. Cathode ray tube
US20100244645A1 (en) * 2009-03-27 2010-09-30 Ricoh Company, Limited Frame that supports a housing
US8210489B2 (en) * 2009-03-27 2012-07-03 Ricoh Company, Limited Frame that supports a housing

Also Published As

Publication number Publication date
BE797489A (fr) 1973-10-01
FR2178228B3 (enrdf_load_stackoverflow) 1976-03-26
FR2178228A1 (enrdf_load_stackoverflow) 1973-11-09
DE2315353A1 (de) 1973-10-25

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Owner name: NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP.,

Free format text: ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981.;ASSIGNOR:GTE PRODUCTS CORPORATION A DE CORP.;REEL/FRAME:003992/0284

Effective date: 19810708

Owner name: NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP.

Free format text: ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981.;ASSIGNOR:GTE PRODUCTS CORPORATION A DE CORP.;REEL/FRAME:003992/0284

Effective date: 19810708