US3808492A - Support frame for color selection electrode in color picture tube - Google Patents

Support frame for color selection electrode in color picture tube Download PDF

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US3808492A
US3808492A US00210453A US21045371A US3808492A US 3808492 A US3808492 A US 3808492A US 00210453 A US00210453 A US 00210453A US 21045371 A US21045371 A US 21045371A US 3808492 A US3808492 A US 3808492A
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flange portion
panel
color
electron gun
gun structure
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US00210453A
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T Nagao
I Nagao
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Hitachi Ltd
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Hitachi Ltd
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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
    • H01J29/073—Mounting arrangements associated with shadow masks

Definitions

  • a color picture tube having a color selection electrode supported in a support frame disposed within the tube envelope consisting of a panel, a cone and a neck, said support frame consisting of an axial flange portion extending substantially parallel to the side wall of the panel, a radial flange portion extending inwardly from and at right angles to said axial flange portion and an electron shield flange portion extending rearwardly from the inner edge of said radial flange portion and substantially parallel to the path of electron beams directed to the edge of the color selection electrode.
  • FIG. 1 a PRICR ART PATENTEDAPR30 m4 My 2 F 2 3.8083192 F l 5 2 PRIOR ART BACKGROUND OF THE INVENTION 1.
  • This invention relates to color picture tubes and,
  • the usual color picture tube has a color selection electrode supported in a support frame which is disposed within the tube envelope consisting of a panel having a face plate provided with an inner phosphor screen, a cone and a neck.
  • the color selection electrode support frame usually has an L-shaped cross sectional contour constituted by an axial flange portion extending parallel to the tube axis and a radial flange portion inwardly extending from the axial flange portion.
  • the support frame is usually spaced a gap of about 1 to 2 cm from the side wall of the tube envelope panel.
  • This gap is closed with an electron shield in order to prevent excessively scanned electron beams, i.e., electron beams excessively deflected out of the color selection electrode such as a shadow mask from entering the afore-said gap and reaching the phosphor screen on the inner side of the face plate of the panel, whereby the deterioration of color purity that is likely to result in the edge portion of the reproduced picture on the face plate screen is prevented.
  • Another object of the'invention is to provide a color picture tube, in which the deformation of the color selection electrode and its support frame due to thermal expansion thereof can be reduced to reduce the color fringing and improve the color purity.
  • FIG. 1 is a sectional view, partly broken away, showing a usual color picture tube.
  • FIG. 2 is a fragmentary sectional view showing part of the tube of FIG. 1.
  • An object of the invention is to provide a color picture tube, which is capable of eliminating undesired effects of excessively scanned electron beams and improving the color purity of the reproduced picture.
  • shadow mask type color picture tubes are the most popular of the color picture tubes, so the following description of the preferred embodiment is concerned with shadow-mask type color picture tubes.
  • the invention is not limited to the shadow mask type color picture tubes, but it can also be applied to color picture tubes provided with such color selection electrodes as grids.
  • FIGS. 1 and.2 show a typical color picture tube, which has a glass tube envelope 11 consisting of panel 12, cone l3 and neck 14.
  • the panel 12 has a front face plate 12a provided with inner phosphor screen 15 and a side wall portion 12b extending parallel to the tube axis A A.
  • an electron gun structure 16 which consists of a plurality of electron guns assembled together.
  • the electron gun structure 16 is disposed.such that a plurality of electron beams (not shown) are shot from it toward the phosphor screen 15 on the inner side of the face plate 12a.
  • a perforated shadow mask 17 serving as a color selection electrode. It is supported in a shadow mask frame 18.
  • the frame 18 holds the shadow mask 17 a suitable distance apart from the phosphor screen 15, and it is fixed in position relative to the panel 12 through a leaf spring 19.
  • the shadow mask frame 18 usually has an L-shaped cross sectional profile, consisting of an axial flange portion 18a extending parallel to the tube axis A A and a radial flange portion 18b extending normal to the tube axis A A. It is spaced from the outer side wall 12b of the panel, and the gap between it and the panel, usually of l to 2 cm, is closed with an electron shield 20 in contact with both of them.
  • the electron shield 20 serves to prevent the electron beams from entering the gap between the shadow mask frame 18 and the panel side wall 12b. Thus, the electron beams will not enter the gap between the frame 18 and panel side wall 12b at the time of the so-called excessive scanning at which the beams are deflected beyond the shadow mask 17.
  • the shadow mask 17 is usually elevated to 70 to 100C.
  • the shadow mask frame 18 is usually blackened for radiating heat through the blackened frame so as to eventually hold the shadow mask l7 and the frame 18 at a low temperature.
  • the electron shield 20 which is not blackened covers almost all the rear surface of the radial flange portion 18b of the shadow mask frame 18, greatly hindering the heat radiation from the frame 18.
  • FIGS. 3 and 4 show preferred embodiments of the color picture tube according to the invention.
  • corresponding parts to those in FIGS. 1 and 2 are designated by same reference numerals.
  • reference numeral designates a shadow mask frame, which consists of an axial flange portion 3011, a radial flange portion 30b and an electron shield portion 30c.
  • the axial flange portion 30a extends substantially parallel to the panel side wall 12b
  • the radial flange portion 30b extends substantially perpendicular to the axial flange portion 30a
  • the electron shield portion 30c extends substantially parallel to the path C of electron beam directed to the edge of the shadow mask 17.
  • the radial flange portion 30b extends from the end of the axial flange portion 30a nearer to the electron gun structure, with shadow mask 17 secured to the axial flange portion 30a and electron shield 20 to the radial flange portion 30b of the frame 30 by suitable securing means.
  • the radial flange portion 30b extends from the end of the axial flange portion 30a nearer to the phosphor screen 15, with both shadow mask 17 and electron shield 20 secured to the axial flange portion 300 of the frame 30 by suitable securing means.
  • the reflected electron beams will be interrupted by the electron shield flange portion 30c which extends substantially parallel to the electron beam path reaching the edge of the shadow mask 17, so that the reflected electron beams will not reach the shadow mask 17.
  • the electron shield flange portion 30c which extends substantially parallel to the electron beam path reaching the edge of the shadow mask 17, so that the reflected electron beams will not reach the shadow mask 17.
  • the effective heat radiation area can be readily increased compared to the prior-art shadow mask frame of the L-shaped cross sectional profile shown in FIGS. 1 and 2.
  • heat radiation can be increased, so that the frame 30 can eventually be held at a lower temperature to reduce deformation of the shadow mask 17 due to the thermal expansion of the shadow mask frame 30 so as to reduce or eliminate the fringing of color reproduction and deterioration of the color purity.
  • FIGS. 5a and 5b show modifications of the shadow mask frames 30 shown in FIGS. 3 and 4.
  • the electron shield flange portion 30c of the frame 30 is made progressively thinner toward the rear edge 30d.
  • the electrons striking the edge 30d of the flange portion 30c can be reduced compared to the preceding embodiments of FIGS. 3 and 4, in which the electron shield portion 30c of the frame 30 has a unifonn thickness.
  • the effective heat radiation area can be substantially the same as or rather larger than that in the preceding embodiments of FIGS. 3 and 4.
  • the color picture tube according to the invention it is possible to prevent electron beams reflected at the panel side wall or cone of the tube envelope from reaching the shadow mask and to greatly increase heat radiation from the shadow mask frame.
  • a color picture tube comprising a glass tube envelope consisting of a panel portion, a cone portion, and a neck portion, a phosphor screen provided on the inner side of a face plate of said panel portion, an electron gun structure disposed within said neck portion of said tube envelope for directing electron beams to said phosphor screen, a color selection electrode interposed between said phosphor screen and said electron gun structure and including a plurality of apertures through which said electron beams pass to said phosphor screen, support means for holding said color selection electrode in position in said tube envelope including an annular electrode support spaced from the side wall of said panel portion so that an annular gap is formed therebetween, said electrode support consisting of an axial flange portion extending substantially parallel to the side wall of said panel portion, a radial flange portion extending inwardly from and at right angles with respect to said axial flange portion and a protrusive flange portion extending rearwardly from the inner edge of said radial flange portion toward said electron gun structure, the inner surface
  • a color picture tube comprising a glass tube envelope consisting of a panel, a cone and a neck, a phosphor screen provided on the inner side of a face plate of said panel, an electron gun structure disposed within said neck, a color selection electrode interposed between said phosphor screen and said electron gun structure, and an electrode support to hold said color selection electrode in position, said electrode support consisting of an axial flange portion extending substantially parallel to the side wall of said panel, a raidal flange portion extending inwardly from and at right angle's with respect to said axial flange portion and a protrusive flange portion extending rearwardly from the inner edge of said radial flange portion, the inner surface of said protrusive flange portion facing the tube axis being substantially parallel to the path of electron beams directed from said electron gun structure to the edge of said color selection electrode, said protrusive flange portion being progressively reduced in the thickness toward its end nearer to said electron gun structure.

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Abstract

A color picture tube having a color selection electrode supported in a support frame disposed within the tube envelope consisting of a panel, a cone and a neck, said support frame consisting of an axial flange portion extending substantially parallel to the side wall of the panel, a radial flange portion extending inwardly from and at right angles to said axial flange portion and an electron shield flange portion extending rearwardly from the inner edge of said radial flange portion and substantially parallel to the path of electron beams directed to the edge of the color selection electrode. With this construction, excessively scanned electron beams are prevented from reaching the phosphor screen on the inner side of the face plate of the panel, thus improving the color purity of the reproduced picture.

Description

United States Patent [1 1 Nagao, deceased Apr. 30, 1974 22 Filed:
' 211 App]. No.: 210,453
[ SUPPORT FRAME FOR COLOR SELECTION ELECTRODE lN COLOR PICTURE TUBE [75] Inventor: Tomohiro Nagao, deceased, late of Yokohama, Japan by lwao Nagao, heir [73] Assignee: Hitachi, Ltd., Marunouchi,
Chiyoda-ku, Japan Dec. 21, 1971 [52] US. Cl. 313/85 S, 3l3/92 B 3,549,932 l2/l970 Lindeman... 313/85 S Primary Examiner-J1. K. Saalbach Assistant ExaminerSiegfried H. Grimm Attorney, Agent, or Firm-Craig & Antonelli ABSTRACT A color picture tube having a color selection electrode supported in a support frame disposed within the tube envelope consisting of a panel, a cone and a neck, said support frame consisting of an axial flange portion extending substantially parallel to the side wall of the panel, a radial flange portion extending inwardly from and at right angles to said axial flange portion and an electron shield flange portion extending rearwardly from the inner edge of said radial flange portion and substantially parallel to the path of electron beams directed to the edge of the color selection electrode. With this construction, excessively scanned electron beams are prevented from reaching the phosphor screen on the inner side of the face plate of the panel, thus improving the color purity of the reproduced picture.
6 Claims, 6 Drawing Figures m mgmrnaomm 181381.492
SHEUIUFZ FIG, a PRICR ART PATENTEDAPR30 m4 My 2 F 2 3.8083192 F l 5 2 PRIOR ART BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to color picture tubes and,
more particularly, to improvements in the construction of the color selection electrode support frame for color picture tubes.
Description of the Prior Art The usual color picture tube has a color selection electrode supported in a support frame which is disposed within the tube envelope consisting of a panel having a face plate provided with an inner phosphor screen, a cone and a neck. The color selection electrode support frame usually has an L-shaped cross sectional contour constituted by an axial flange portion extending parallel to the tube axis and a radial flange portion inwardly extending from the axial flange portion. The support frame is usually spaced a gap of about 1 to 2 cm from the side wall of the tube envelope panel. This gap is closed with an electron shield in order to prevent excessively scanned electron beams, i.e., electron beams excessively deflected out of the color selection electrode such as a shadow mask from entering the afore-said gap and reaching the phosphor screen on the inner side of the face plate of the panel, whereby the deterioration of color purity that is likely to result in the edge portion of the reproduced picture on the face plate screen is prevented.
However, with the conventional color picture'tube part of the electron beams reflected at the panel side wall or cone of the tube envelope cannot be prevented from penetrating the color selection electrode, for instance small holes or pores of a shadow mask, and reaching the phosphor screen. Therefore, the color purity of the edgepart of the reproduced picture is deteriorated.
Meanwhile, in the operation of the color picture tube, as electrons shot from the electron guns strike the color selection electrode, their kinetic energy is converted into heat energy, so that the temperature of the color selection electrode, such as a shadow mask, and its support frame is elevated to cause considerable thermal expansion. The deformation of the color selection electrode and its support frame due to thermal expansion thereof would cause color fringing and deteriorate the color purity of the reproduced color picture. To av- Another object of the'invention is to provide a color picture tube, in which the deformation of the color selection electrode and its support frame due to thermal expansion thereof can be reduced to reduce the color fringing and improve the color purity.
BRIEF DESCRIPTION OF THE DRAWING The invention will now be described in connection with the accompanying drawing, in which:
FIG. 1 is a sectional view, partly broken away, showing a usual color picture tube.
FIG. 2 is a fragmentary sectional view showing part of the tube of FIG. 1.
oide this undesirable deformation due to thermal expansion, it is usual to blacken the color selection electrode support frame so that heat produced by impingement of electrons upon the color selection electrode may be radiated via the support frame thereof so as to hold the color selection electrode and the support SUMMARY OF THE INVENTION An object of the invention is to provide a color picture tube, which is capable of eliminating undesired effects of excessively scanned electron beams and improving the color purity of the reproduced picture.
showing other examples of the shadow mask frame for the color picture tube embodying the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Presently, shadow mask type color picture tubes are the most popular of the color picture tubes, so the following description of the preferred embodiment is concerned with shadow-mask type color picture tubes. However, it is to be understood that the invention is not limited to the shadow mask type color picture tubes, but it can also be applied to color picture tubes provided with such color selection electrodes as grids.
To facilitate the understanding of the invention, a typical prior-art color picture tube will now be described.
FIGS. 1 and.2 show a typical color picture tube, which has a glass tube envelope 11 consisting of panel 12, cone l3 and neck 14. The panel 12 has a front face plate 12a provided with inner phosphor screen 15 and a side wall portion 12b extending parallel to the tube axis A A. Within the neck 14 is disposed an electron gun structure 16, which consists of a plurality of electron guns assembled together. The electron gun structure 16 is disposed.such that a plurality of electron beams (not shown) are shot from it toward the phosphor screen 15 on the inner side of the face plate 12a. Between the electron gun structure 16 and phosphor screen 15 there is interposed a perforated shadow mask 17 serving as a color selection electrode. It is supported in a shadow mask frame 18. The frame 18 holds the shadow mask 17 a suitable distance apart from the phosphor screen 15, and it is fixed in position relative to the panel 12 through a leaf spring 19.
The shadow mask frame 18 usually has an L-shaped cross sectional profile, consisting of an axial flange portion 18a extending parallel to the tube axis A A and a radial flange portion 18b extending normal to the tube axis A A. It is spaced from the outer side wall 12b of the panel, and the gap between it and the panel, usually of l to 2 cm, is closed with an electron shield 20 in contact with both of them. The electron shield 20 serves to prevent the electron beams from entering the gap between the shadow mask frame 18 and the panel side wall 12b. Thus, the electron beams will not enter the gap between the frame 18 and panel side wall 12b at the time of the so-called excessive scanning at which the beams are deflected beyond the shadow mask 17.
With the color picture tube of the above construction, however, an electron beam led along path B in FIG. 2 and reflected at the panel side wall 12b or cone 13 is likely to pass through small holes or pores of the shadow mask 17 and strike the phosphor screen 15, thus adversely affecting the color purity of the edge area of the face plate 12a.
Also, in the operation of the color picture tube of the above construction about 80 to 85 percent of electrons shot from the electron gun structure 16 strike the shadow mask 17. Upon impingement of electrons upon the shadow mask, their kinetic energy is converted into heat energy, so that the temperature of the shadow mask 17 is usually elevated to 70 to 100C. Such a high temperature of the shadow mask 17 and its frame 18 can cause a considerable thermal expansion thereof. The deformation of the shadow mask 18 and its frame 18 due to this thermal expansion would cause fringing of the color reproduction and deteriorate the color purity. To avoid the above undesired deformation, the shadow mask frame 18 is usually blackened for radiating heat through the blackened frame so as to eventually hold the shadow mask l7 and the frame 18 at a low temperature.
However, in the usual color picture tube of FIGS. 1 and 2, the electron shield 20 which is not blackened covers almost all the rear surface of the radial flange portion 18b of the shadow mask frame 18, greatly hindering the heat radiation from the frame 18.
FIGS. 3 and 4 show preferred embodiments of the color picture tube according to the invention. In these Figures, corresponding parts to those in FIGS. 1 and 2 are designated by same reference numerals.
Referring to FIGS. 3 and 4, reference numeral designates a shadow mask frame, which consists of an axial flange portion 3011, a radial flange portion 30b and an electron shield portion 30c. The axial flange portion 30a extends substantially parallel to the panel side wall 12b, the radial flange portion 30b extends substantially perpendicular to the axial flange portion 30a, and the electron shield portion 30c extends substantially parallel to the path C of electron beam directed to the edge of the shadow mask 17.
In the embodiment of FIG. 3, the radial flange portion 30b extends from the end of the axial flange portion 30a nearer to the electron gun structure, with shadow mask 17 secured to the axial flange portion 30a and electron shield 20 to the radial flange portion 30b of the frame 30 by suitable securing means.
In the embodiment of FIG. 4, the radial flange portion 30b extends from the end of the axial flange portion 30a nearer to the phosphor screen 15, with both shadow mask 17 and electron shield 20 secured to the axial flange portion 300 of the frame 30 by suitable securing means.
In the color picture tubes having a shadow mask frame 30 of the above constructions, even if there are electron beams led along path D and reflected at panel side wall 12b or cone 13 of the tube envelope, the reflected electron beams will be interrupted by the electron shield flange portion 30c which extends substantially parallel to the electron beam path reaching the edge of the shadow mask 17, so that the reflected electron beams will not reach the shadow mask 17. Thus, deterioration of color purity which is otherwise likely to result in the edge area of the face plate 12a can be completely prevented.
Also, even if one of the axial, radial and electron shield flange portions 30a, 30b and 30c of the shadow mask frame 30 is completely covered with the electron shield 20, the effective heat radiation area can be readily increased compared to the prior-art shadow mask frame of the L-shaped cross sectional profile shown in FIGS. 1 and 2. Thus, heat radiation can be increased, so that the frame 30 can eventually be held at a lower temperature to reduce deformation of the shadow mask 17 due to the thermal expansion of the shadow mask frame 30 so as to reduce or eliminate the fringing of color reproduction and deterioration of the color purity.
FIGS. 5a and 5b show modifications of the shadow mask frames 30 shown in FIGS. 3 and 4. In these modiflcations, the electron shield flange portion 30c of the frame 30 is made progressively thinner toward the rear edge 30d. With this construction, the electrons striking the edge 30d of the flange portion 30c can be reduced compared to the preceding embodiments of FIGS. 3 and 4, in which the electron shield portion 30c of the frame 30 has a unifonn thickness. In these modifications the effective heat radiation area can be substantially the same as or rather larger than that in the preceding embodiments of FIGS. 3 and 4.
As has been described in the foregoing, with the color picture tube according to the invention it is possible to prevent electron beams reflected at the panel side wall or cone of the tube envelope from reaching the shadow mask and to greatly increase heat radiation from the shadow mask frame.
I claim:
I. A color picture tube comprising a glass tube envelope consisting of a panel portion, a cone portion, and a neck portion, a phosphor screen provided on the inner side of a face plate of said panel portion, an electron gun structure disposed within said neck portion of said tube envelope for directing electron beams to said phosphor screen, a color selection electrode interposed between said phosphor screen and said electron gun structure and including a plurality of apertures through which said electron beams pass to said phosphor screen, support means for holding said color selection electrode in position in said tube envelope including an annular electrode support spaced from the side wall of said panel portion so that an annular gap is formed therebetween, said electrode support consisting of an axial flange portion extending substantially parallel to the side wall of said panel portion, a radial flange portion extending inwardly from and at right angles with respect to said axial flange portion and a protrusive flange portion extending rearwardly from the inner edge of said radial flange portion toward said electron gun structure, the inner surface of said protrusive flange portion facing the tube axis being substantially in parallel to the path of electron beams directed from said electron gun structure to the edge of said color selection electrode, and an annular electron shield extending radially outward from said electrode support toward said side wall of said panel portion to close said annular gap.
2. The color picture tube according to claim 1, wherein said radial flange portion extends from the end of said axial flange portion nearer to said electron gun structure.
3. The color picture tube according to claim 2, wherein the thickness of said protrusive flange portion is progressively reduced toward its end nearer to said electron gun structure.
4. The color picture tube according to claim 2, wherein said radial flange portion extends from the end of said axial flange portion nearer to said phosphor screen.
5. The color picture tube according to claim 4, wherein the thickness of said protrusive flange portion is progressively reduced toward its end nearer to said electron gun structure.
6. A color picture tube comprising a glass tube envelope consisting of a panel, a cone and a neck, a phosphor screen provided on the inner side of a face plate of said panel, an electron gun structure disposed within said neck, a color selection electrode interposed between said phosphor screen and said electron gun structure, and an electrode support to hold said color selection electrode in position, said electrode support consisting of an axial flange portion extending substantially parallel to the side wall of said panel, a raidal flange portion extending inwardly from and at right angle's with respect to said axial flange portion and a protrusive flange portion extending rearwardly from the inner edge of said radial flange portion, the inner surface of said protrusive flange portion facing the tube axis being substantially parallel to the path of electron beams directed from said electron gun structure to the edge of said color selection electrode, said protrusive flange portion being progressively reduced in the thickness toward its end nearer to said electron gun structure.

Claims (6)

1. A color picture tube comprising a glass tube envelope consisting of a panel portion, a cone portion, and a neck portion, a phosphor screen provided on the inner side of a face plate of said panel portion, an electron gun structure disposed within said neck portion of said tube envelope for directing electron beams to said phosphor screen, a color selection electrode interposed between said phosphor screen and said electron gun structure and including a plurality of apertures through which said electron beams pass to said phosphor screen, support means for holding said color selection electrode in position in said tube envelope including an annular electrode support spaced from the side wall of said panel portion so that an annular gap is formed therebetween, said electrode support consisting of an axial flange portion extending substantially parallel to the side wall of said panel portion, a radial flange portion extending inwardly from and at right angles with respect to said axial flange portion and a protrusive flange portion extending rearwardly from the inner edge of said radial flange portion toward said electron gun structure, the inner surface of said protrusive flange portion facing the tube axis being substantially in parallel to the path of electron beams directed from said electron gun structure to the edge of said color selection electrode, and an annular electron shield extending radially outward from said electrode support toward said side wall of said panel portion to close said annular gap.
2. The color picture tube according to claim 1, wherein said radial flange portion extends from the end of said axial flange portion nearer to said electron gun structure.
3. The color picture tube according to claim 2, wherein the thickness of said protrusive flange portion is progressively reduced toward its end nearer to said electron gun structure.
4. The color picture tube according to claim 2, wherein said radial flange portion extends from the end of said axial flange portion nearer to said phosphor screen.
5. The color picture tube according to claim 4, wherein the thickness of said protrusive flange portion is progressively reduced toward its end nearer to said electron gun structure.
6. A color picture tube comprising a glass tube envelope consisting of a panel, a cone and a neck, a phosphor screen provided on the inner side of a face plate of said panel, an electron gun structure disposed within said neck, a color selection electrode interposed between said phosphor screen and said electron gun structure, and an electrode support to hold said color selection electrode in position, said electrode support consisting of an axial flange portion extending substantially parallel to the side wall of said panel, a raidal flange portion extending inwardly from and at right angles with respect to said axial flange portion and a protrusive flange portion extending rearwardly from the inner edge of said radial flange portion, the inner surface of said protrusive flange portion facing the tube axis being substantially parallel to the Path of electron beams directed from said electron gun structure to the edge of said color selection electrode, said protrusive flange portion being progressively reduced in the thickness toward its end nearer to said electron gun structure.
US00210453A 1971-12-21 1971-12-21 Support frame for color selection electrode in color picture tube Expired - Lifetime US3808492A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318025A (en) * 1979-11-21 1982-03-02 North American Philips Consumer Electronics Corp. Shadow mask microphonic suppressor
US5327043A (en) * 1992-07-15 1994-07-05 Rca Thomson Licensing Corporation Internal magnetic shield-frame mounting means
US20010033129A1 (en) * 2000-04-25 2001-10-25 Matsushita Electric Industrial Co., Ltd. Color cathode ray tube
US6727638B2 (en) * 2000-12-22 2004-04-27 Thomson Licensing S.A. Shield for a tension masks in a cathode ray tube

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3343024A (en) * 1964-11-25 1967-09-19 Nat Video Corp Cathode ray tube with improved shadow mask mounting spring arrangement
US3506867A (en) * 1968-06-18 1970-04-14 Zenith Radio Corp Cathode ray tube with electron shield hingedly mounted on shadow mask frame
US3549932A (en) * 1969-04-04 1970-12-22 Motorola Inc Color television tube with shadow mask assembly provided with shield for reducing x-ray radiation and the effect of stray magnetic fields

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3343024A (en) * 1964-11-25 1967-09-19 Nat Video Corp Cathode ray tube with improved shadow mask mounting spring arrangement
US3506867A (en) * 1968-06-18 1970-04-14 Zenith Radio Corp Cathode ray tube with electron shield hingedly mounted on shadow mask frame
US3549932A (en) * 1969-04-04 1970-12-22 Motorola Inc Color television tube with shadow mask assembly provided with shield for reducing x-ray radiation and the effect of stray magnetic fields

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318025A (en) * 1979-11-21 1982-03-02 North American Philips Consumer Electronics Corp. Shadow mask microphonic suppressor
US5327043A (en) * 1992-07-15 1994-07-05 Rca Thomson Licensing Corporation Internal magnetic shield-frame mounting means
US20010033129A1 (en) * 2000-04-25 2001-10-25 Matsushita Electric Industrial Co., Ltd. Color cathode ray tube
EP1150325A1 (en) * 2000-04-25 2001-10-31 Matsushita Electric Industrial Co., Ltd. Color cathode ray tube
US6784607B2 (en) 2000-04-25 2004-08-31 Matsushita Electric Industrial Co., Ltd. Color cathode ray tube
US6727638B2 (en) * 2000-12-22 2004-04-27 Thomson Licensing S.A. Shield for a tension masks in a cathode ray tube

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