Coating Or Shielding Patents (Class 313/479)
  • Patent number: 5847795
    Abstract: A liquid crystal display apparatus includes a liquid crystal panel for data display comprising a pair of oppositely disposed substrates and a liquid crystal disposed between the substrates, a sheet of substantially transparent protection plate disposed opposite to and with a prescribed gap from a display surface of the liquid crystal panel for protecting the liquid crystal panel, and a polarizer sheet for selectively transmitting light having a plane of polarization in a prescribed direction disposed on at least the display surface of the liquid crystal panel. The display apparatus further includes an anti-reflection film disposed on at least a front surface on an opposite side with respect to the liquid crystal panel of the protection plate among two surfaces of the protection plate and a surface of the polarizer sheet.
    Type: Grant
    Filed: July 25, 1996
    Date of Patent: December 8, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Satoh, Katsumi Kurematsu, Hiroshi Takabayashi, Masanori Takahashi, Akisato Katanosaka, Noriko Matoba
  • Patent number: 5841227
    Abstract: An auxiliary radiation shield for a CRT-type video display terminal includes a generally flat front portion having an at least partially transparent conductive central shield and an opaque frame-like conductive outer shield surrounding the central shield, with the transparent central shield having an area substantially equal to that of the faceplate of the CRT and the opaque outer shield having an area at least equal to that of the transparent central shield, whereby when the radiation shield is supported in front of the CRT with the transparent central shield disposed directly in front of the faceplate, the transparent central shield is in the path of the electrical field that would otherwise extend through the faceplate towards any user in front of the CRT, and the opaque outer shield intersects a substantial portion of the electrical fields that would otherwise extend from the sides and top of the CRT towards that user.
    Type: Grant
    Filed: January 24, 1996
    Date of Patent: November 24, 1998
    Inventor: David J. Terpin
  • Patent number: 5841234
    Abstract: A device for shielding an electrical field emitted backward from a video display appliance. The device includes a device for shielding an electrical field emitted backward from a video display appliance including a CRT having an anode to which a high voltage is supplied, a deflection yoke for deflecting electron beams produced from electron guns, and a video board for processing and outputting video signals to the CRT, the device comprising, a first patterned section printed on a periphery of a back of the video board and connected to ground, and a second patterned section printed inside the first patterned section, the scond patterned section having a pulse applying portion to which a pulse voltage having a polarity opposite to the electric field waveform is applied and a termination portion.
    Type: Grant
    Filed: July 29, 1997
    Date of Patent: November 24, 1998
    Assignee: LG Electronics, Inc.
    Inventor: Seok Hwa Jeong
  • Patent number: 5821686
    Abstract: The present invention provides both inner shield materials and its manufacturing method with superior magnetic characteristics and rust protection, which does not require conventional blackening process. Another object of the present invention is to provide the inner-shield manufacturing method, by which steel sheet or strip passing is smoothed in the plating process and Ni-plated steel sheet or strip is prevented from sticking in the annealing process.
    Type: Grant
    Filed: December 24, 1996
    Date of Patent: October 13, 1998
    Assignee: Tokyo Kohan Co., Ltd.
    Inventors: Giichiro Nomura, Osamu Yubuta
  • Patent number: 5817421
    Abstract: An anti-reflection film is produced on the panel surface of a cathode-ray tube by:(A) preparing a solution for forming an anti-reflection film, which contains water and a metal alkoxide having the formula,M(OR).sub.nwherein M is a metal selected from the group consisting of Si, Ti, Al, Zr, Sn, In, Sb and Zn; R is an alkyl group having 1-10 carbon atoms; n is an integer of from 1 to 8; and when n is not 1, the alkyl groups represented by R may be the same or different,(B) coating the solution for forming an anti-reflection film on the outermost surface of the panel of a cathode-ray tube, and(C) applying an ultraviolet light to the solution for forming an anti-reflection film coated on said surface to cure the solution to form a transparent film with fine roughness.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: October 6, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Tomoji Oishi, Sachiko Maekawa, Akira Kato, Masahiro Nishizawa, Yoshifumi Tomita, Kojiro Okude, Kenji Tochigi, Yutaka Misawa
  • Patent number: 5811923
    Abstract: The present invention is directed to methods and apparatus for enhancing the performance of visual display units which utilize plasma display panels. More specifically, the present invention provides methods and apparatus for providing an optically enhancing/noise suppressing device for positioning in front of the viewing surface of a plasma display panel. The device also increases the impact resistance of the PDP. The device of the present invention is manufactured separately from the PDP. The device may be provided with attachment means for securing the device to the surface of the visual display unit in a position in front of the viewing surface of the PDP or may be designed to be free-hanging, i.e., suspended, or otherwise positioned in front of the viewing surface of the PDP.
    Type: Grant
    Filed: December 23, 1996
    Date of Patent: September 22, 1998
    Assignee: Optical Coating Laboratory, Inc.
    Inventors: Jaroslaw Zieba, James W. Seeser, Michael Cumbo, William T. Beauchamp, Robert Scanlon, Curtis Hruska
  • Patent number: 5804912
    Abstract: A magnetic cathode ray tube (CRT) which has an iron or cobalt based amorphous alloy layer on the surface of a glass bulb shows an excellent magnetic shielding effect and has simple structure.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: September 8, 1998
    Assignee: Samsung Display Devices Co., Ltd.
    Inventor: Dong Min Park
  • Patent number: 5789854
    Abstract: A cathode ray tube having a double-layer low-reflective coating layer, or a triple-layer low-reflective coating layer including a high-refractive transparent conductive layer formed on the outer surface of a face plate thereof, and a low-refractive smooth transparent layer formed on the outer surface of the high-refractive transparent conductive layer, or a low-refractive transparent layer having concavities and convexities formed on the low-refractive smooth transparent layer, wherein yellow dye or pigment is added to at least one of said three layers, whereby the reflection spectrum in the visible ray region can be flattened so that a cathode ray tube is obtained in which reflection in the short wavelength region and long wavelength region can be reduced, coloring can be suppressed, and natural external reflected light can be obtained.
    Type: Grant
    Filed: November 8, 1995
    Date of Patent: August 4, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tomoki Takizawa, Suguru Fujii, Mikako Maeda
  • Patent number: 5784201
    Abstract: A reflection-preventing layer for a display device includes a transparent insulating substrate, at least one dielectric film formed on the transparent insulating substrate, and an amorphous carbon thin-film layer having a diamond-like carbon film on the uppermost dielectric layer of the dielectric films, so that the reflectance of the reflection-preventing layer is semi-permanently decreased while increasing the surface solidity thereof.
    Type: Grant
    Filed: September 13, 1995
    Date of Patent: July 21, 1998
    Assignee: LG Electronics Inc.
    Inventors: Kyeong Won Lee, Kyung Chan Park
  • Patent number: 5773924
    Abstract: A color cathode ray tube includes an envelope having a front panel and a funnel joined to periphery of the front panel; a phosphor screen disposed on an inner surface of the front panel; a shadow mask disposed to face the phosphor screen and having a plurality of apertures for passing electron beams; an electron gun disposed in a neck of the funnel and emitting the electron beams toward the shadow mask; and a magnetic shield disposed within the envelope and surrounding a path along which the electron beams travel. The magnetic shield has a first side plate, a third side plate facing the first side plate, a second side plate, a fourth side portion facing the second side plate, a first opening on the side of the shadow mask, and a second opening on the side of the electron gun, thereby forming almost a hollow frustum of quadrangular pyramid, and only each of the first and third side plates has notches in the vicinity of both ends of edges of the first and third side plates on the side of the second opening.
    Type: Grant
    Filed: August 2, 1996
    Date of Patent: June 30, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Kouji Nakamura
  • Patent number: 5773150
    Abstract: A high molecular weight, i.e., molecular weight of 90,000-750,000, conductive polymer soluble in both water and alcohol is mixed with a solution of water, alcohol, tetraethoxysilane (TES), and nitric acid (HNO.sub.3) to provide an antistatic coating for a glass display panel of a cathode ray tube (CRT) for grounding static charge on the panel. Conductive polymers such as of polyaniline mixed with either polystyrene sulfonic acid or polyacrylic acid in a molecular ratio of 1:1 or 3,4 polyethylenedioxythiophene added to polystyrenesulphonate in a molecular ratio of 1:1 form a conductive complex which when mixed with a solution of water, alcohol, TES and HNO.sub.3 provides a coating solution with a resistivity in the range of 10.sup.7-10.sup.9 ohm/cm.sup.2 on the outer surface of the CRT display panel.
    Type: Grant
    Filed: November 17, 1995
    Date of Patent: June 30, 1998
    Assignee: Chunghwa Picture Tubes, Ltd.
    Inventors: Hua-Sou Tong, Chun-Min Hu
  • Patent number: 5763996
    Abstract: A cathode ray tube is provided. The cathode ray tube according to the present invention includes a panel having a fluorescent film formed on the inner surface thereof, a shadow mask frame assembly disposed inside the panel, a funnel to which the panel is sealed and having an electron gun installed in a neck portion thereof and a deflection yoke installed around a cone portion thereof, and a magnetic field shielding portion which is installed along the wall of the funnel and includes a metal plate for blocking the influences of terrestrial magnetic fields. In the cathode ray tube according to the present invention, it is possible to block the influences of terrestrial magnetic fields with a magnetic field shielding portion having a simple structure.
    Type: Grant
    Filed: January 24, 1997
    Date of Patent: June 9, 1998
    Assignee: Samsung Display Devices Co., Ltd.
    Inventor: Jae-woo Kim
  • Patent number: 5760540
    Abstract: A CRT display device including an envelope having a faceplate of a predetermined light transmissivity, a luminescent screen disposed on an inner surface of the faceplate and electron beam producing means disposed within the envelope for exiting the screen to effect production of a luminescent image, a neutral density transmissivity filter means disposed adjacent an outer surface of the faceplate, wherein for viewing under high ambient light conditions the total transmissivity T.sub.t is 10%.ltoreq.T.sub.t .ltoreq.30%, and during operation of the display device the electron beam producing means produce a beam current density on the screen such that the contrast C.sub.4000 is 4.ltoreq.C.sub.4000 .ltoreq.8.
    Type: Grant
    Filed: September 12, 1995
    Date of Patent: June 2, 1998
    Assignee: U.S. Philips Corporation
    Inventor: Jan H. Duistermaat
  • Patent number: 5757117
    Abstract: In a cathode ray tube having an antistatic film 6 stuck to the front surface of a panel section 1 and a conductive tape 7 for grounding the end portion of the antistatic film 6 to the earth, a silicone adhesive 8 containing a conductive filler having an excellent close contact adhesion to silicon dioxide (SiO.sub.2) is interposed in at least a part of an close contact adhesion portion where the conductive tape 7 is stuck to the antistatic film 6. Thanks to the interposition of the conductive filler containing silicone adhesive 8, the resistances between the antistatic film 6 and the conductive tape 7 and between the silicone adhesive 8 and the conductive tape 7 can be lowered and sputtering which may be caused by the high voltage induced in the antistatic film 6 is prevented, so that the breakage of the antistatic film 6 can be prevented at the close contact adhesion portion.
    Type: Grant
    Filed: August 16, 1996
    Date of Patent: May 26, 1998
    Assignees: Hitachi, Ltd., Hitachi Device Engineering Co., Ltd.
    Inventors: Shigemi Hirasawa, Norikazu Uchiyama, Toshio Tojo, Toshio Uyama, Hisashi Nose, Toshikazu Igarashi, Zenjiro Kanzaki
  • Patent number: 5757118
    Abstract: In an X-ray image intensifier tube apparatus inc-luding a cylindrical magnetic shield placed to surround the outer periphery of an X-ray image intensifier tube, a ferromagnetic thin plate is placed in front of a convex input window of a vacuum envelope and a correcting magnetic coil is placed inside the cylindrical magnetic shield to surround the input window. This structure allows an output image which is substantially free of distortion to be obtained.
    Type: Grant
    Filed: May 17, 1996
    Date of Patent: May 26, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hiroshi Kubo
  • Patent number: 5751102
    Abstract: The present invention concerns a cathode ray display tube in which the layers of a scattered electrons suppressing material are formed on the surface of a metal back layer on a phosphor layer and the inner surface of a funnel part. Each of the scattered electrons suppressing material layers on the surface of the metal back layer and on the inner surface of the funnel part is formed with an amount per unit area within specific ranges. The scattered electrons suppressing material layer is provided to form a laminated layer which is composed of lamina shaped graphite particles with a diameter which is ten times or more as large as a thickness and an average particle size in terms of spherical volume not more than 2 .mu.m. The scattered electrons suppressing material layers reduce unnecessary light emission due to scattered electrons and improve the contrast of a display image. A projection display system providing a display image with high contrast can be constituted by using the cathode display tubes.
    Type: Grant
    Filed: June 30, 1997
    Date of Patent: May 12, 1998
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takaaki Tanaka, Masahide Yamauchi, Yasuhisa Ishikura, Masaki Aoki
  • Patent number: 5744904
    Abstract: An apparatus for reducing the leakage of the magnetic field from a deflection yoke without consumption of additional energy is provided. The apparatus includes a first circuit and a second circuit. The first circuit substantially loops around the upper portion of the funnel shaped C.R.T., defining a first space, and is connected to the ground reference. When the upper magnetic field generated from the deflection yoke passes through the first space, a first current of eddy current type is generated within the first circuit which, in turn, results in heat whereby the leakage of the magnetic field is reduced. The second circuit substantially loops around the lower portion of the funnel shaped C.R.T., defining a second space, and is connected to the ground reference.
    Type: Grant
    Filed: September 16, 1996
    Date of Patent: April 28, 1998
    Assignee: Acer Peripherals, Inc.
    Inventor: Hsieh Chang-Fa
  • Patent number: 5742119
    Abstract: The display screen 3 of a cathode ray tube 1 is provided with an electroconductive coating 8 of poly-3,4-ethylene dioxythiophene. The layer 8 has a sheet resistance of 1 k.OMEGA./.quadrature. and a high transmission. The layer 8 provides an effective shield against electromagnetic radiation. The coating can be provided with additional layers of, for example, silicon dioxide to improve the mechanical properties.
    Type: Grant
    Filed: August 8, 1995
    Date of Patent: April 21, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus V. A. Aben, Leo H. M. Krings
  • Patent number: 5742128
    Abstract: Apparatus for mitigating the adverse effects of magnetic interference on the operation of a CRT is provided. More specifically, magnetic sensors are placed in a gap formed between a front bezel and a rear enclosure comprising a magnetic shield enclosing all but the viewing surface of a CRT. The gap serves to concentrate the on-axis magnetic field and the resultant signal from the sensors is amplified to drive current through a compensation coil located inside the front bezel and in front of the viewing surface of the CRT. The current generates a compensation field that mitigates the incoming on-axis magnetic field. The ambient magnetic field is also sensed by a three axis magnetic sensing assemblage located outside the magnetic shield. The output of the sensing arrangement is operated on to produce a trigger to start a degauss cycle.
    Type: Grant
    Filed: May 22, 1996
    Date of Patent: April 21, 1998
    Assignee: Orwin Associates, Inc.
    Inventors: Winfield Scott Bearce, Christopher N. Haywood, John Druchunas
  • Patent number: 5742118
    Abstract: An ultrafine particle film which has excellent anti-staining properties, is effective for the prevention of electrostatic charge and reflection of visible light and can be applied to a large area at low cost, and an image display plate such as the one adapted to a Braun tube to which the ultrafine particle film is applied, and a process for producing the ultrafine particle film which comprises attaching a coating solution bath 22 to a surface of a Braun tube 21, filling the bath with a coating solution 23 containing antistatic SnO.sub.
    Type: Grant
    Filed: April 20, 1994
    Date of Patent: April 21, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Yoshishige Endo, Masahiko Ono, Hiromitsu Kawamura, Katsumi Kobara, Yoshifumi Tomita, Masahiro Miyazaki, Takao Kawamura, Toshihiro Yamada, Toshiaki Kawabata, Takeshi Araya
  • Patent number: 5717281
    Abstract: The inner surface of a video display panel such as cathode ray tube (CRT) glass faceplate is initially coated with a mixture of one of the primary color phosphors, an organic binder such as polyvinyl alcohol (PVA) diluted with water, and a photoresist agent. The organic binder overcomes the poor adhesion to the glass faceplate of the photoresist which typically includes polyvinyl pyrrolidone (PVP) and reduces the oxygen which decreases phosphor exposure time. To overcome PVA and PVP incompatibilities which give rise to nonuniform film thickness, a vinyl pyrrolidone-vinyl alcohol (VP-VA) copolymer is added to the phosphor, organic binder and photoresist mixture in the range of 0.1-30 wt %. The copolymer with both the VP and VA functioning groups serves as a coupling agent between the PVA and PVP and eliminates incompatibilities between these components. The VP-VA copolymer preferably has a VP/VA mole ratio in the range of 20/80 to 80/20.
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: February 10, 1998
    Assignee: Chunghwa Picture Tubes, Ltd.
    Inventors: Hua-Sou Tong, Chun-Min Hu, Yu-Chung Yu
  • Patent number: 5717282
    Abstract: Display device comprising a display screen provided with phosphors, and coated with a spectrally selective, light-absorbing coating comprising silicon oxide and at least two dyes. The spectral transmissions for blue, green and red phosphor light are chosen to be such that the electron currents towards the blue, green and red phosphors for obtaining white D (6,500K) are substantially equal.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: February 10, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Emmanuel W.J.L. Oomen, Daniel Den Engelsen
  • Patent number: 5702179
    Abstract: A discharge lamp, such as a neon lamp or a subminiature fluorescent lamp, includes an elongated tubular lamp envelope containing a fill material for supporting a light-emitting discharge and electrodes mounted at opposite ends of the lamp envelope. A light-transmissive conductive coating on the lamp envelope substantially attenuates emission of RF energy. A conductor in electrical contact with the conductive coating couples the conductive coating to a reference potential, such as ground. The conductor may be a metal or conductive silicone strip in electrical contact with the conductive coating along the length of the lamp envelope. The discharge lamp may be connected to a ballast circuit by coaxial cables. The outer conductor of each coaxial cable is connected to the conductive coating to form a continuous RF shield. The conductive coating and/or the metal strip may be used for heating of the discharge lamp.
    Type: Grant
    Filed: October 2, 1995
    Date of Patent: December 30, 1997
    Assignee: Osram Sylvania, Inc.
    Inventors: Steven C. Sidwell, George J. English, Robert L. Garrison, Ralph J. Johnson
  • Patent number: 5698855
    Abstract: The present invention provides an electron gun assembly including at least one field emission type cold cathode acting as an electron beam source, a support for supporting the cold cathode thereon, a control electrode spaced away from the cold cathode, the control electrode cooperating with the support to enclose the cold cathode therein, a thermal shield member provided both around the control electrode and below the support to prevent heat conduction to the cold cathode. The thermal shield member does not allow heat conduction to the cold cathode when the electron gun assembly is to be enclosed in a glass valve by softening a neck portion of the glass valve with an oxygen burner and then attaching the softened neck portion to the electron gun assembly, resulting in that an emitter of the cold cathode is not increased in temperature and that a summit of an emitter is not oxidized.
    Type: Grant
    Filed: July 16, 1996
    Date of Patent: December 16, 1997
    Assignee: NEC Corporation
    Inventor: Toshio Kaihara
  • Patent number: 5698940
    Abstract: In the faceplate of a cathode ray tube or in an FED the amount of light emanating from the phosphor that reaches a viewer is increased by the use of internal and external antireflection layers and concavities between layers on the side of the viewer with respect to the phosphor layer.
    Type: Grant
    Filed: January 23, 1996
    Date of Patent: December 16, 1997
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Arthur Ballato, David C. Morton
  • Patent number: 5694001
    Abstract: A picture display device is provided with a display screen for transmitting light in a spectral range, and a selectively transmissive coating. The local transmission of the coating in the spectral range is dependent on the radiation which is locally incident on the coating, while the transmission of the coating automatically decreases as the intensity of the incident radiation increases. The transmission of the coating is preferably dependent on the radiation which is incident on the coating at a wavelength outside the spectral range. Such a device has the advantage that the contrast is enhanced in an optimum way, even if the ambient light is not homogeneously distributed across the display screen.
    Type: Grant
    Filed: October 26, 1995
    Date of Patent: December 2, 1997
    Assignee: U.S. Philips Corporation
    Inventor: Ytsen Wielstra
  • Patent number: 5693259
    Abstract: A cathode ray tube is coated on the inner surface with a conductive coating composition using acidic plumous alumina sol, acidic chaining silica sol, and graphite powder as raw materials; and, novel cathode ray tubes of which the inner surface is coated independently with the above, or in combination with other conductive coating agents.
    Type: Grant
    Filed: December 5, 1995
    Date of Patent: December 2, 1997
    Assignee: Acheson Industries, Inc.
    Inventor: Shiro Otaki
  • Patent number: 5677592
    Abstract: A cathode ray tube is constructed such that a resistance of a first conductive element connected to a metal film on the inner side of the panel is lower than a resistance of a second conductive element connected to a shadow mask. Thus, the amount of electrons which are emitted from an electron gun to strike the metal film increases, to thereby enhance luminance, and the amount of electrons striking the shadow mask is decreased, to thereby reduce thermal deformation of the shadow mask.
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: October 14, 1997
    Assignee: Samsung Display Devices Co., Ltd.
    Inventors: Jong-seo Choi, Kwi-seuk Choi, Kyu-nam Joo
  • Patent number: 5656885
    Abstract: The present invention is directed to a transmission type flat cathode ray tube in which a flat glass tube envelope (15) is formed of a triple structure having a screen panel (11), a back panel (12) and a funnel portion (14) having a neck portion (13). A carbon film (24) to which an anode voltage is applied is formed on the inner surface of the back panel 12 in an opposing relation to a phosphor screen (19) of the screen panel (11). Thus, the occurrence of a pseudo signal in the transmission type flat cathode ray tube can be avoided.
    Type: Grant
    Filed: January 29, 1993
    Date of Patent: August 12, 1997
    Assignee: Sony Corporation
    Inventors: Yoji Kohno, Ichiro Utsumi
  • Patent number: 5652476
    Abstract: The present invention is directed to an antireflection film having a multilayer structure in which an antireflection multi-layer film including at least two thin films is formed on a substrate, wherein at least one of the thin films contains a coloring agent. The antireflection multi-layer film absorbs light of an entire range of wavelength of 400-700 nm, and the reflectance of the antireflection multi-layer film with regard to the wavelength, light of which this antireflection multi-layer film can absorb, is smaller than the reflectance of the substrate. The antireflection film can be applied to a cathode ray tube or a light-transmitting display substrate of a display apparatus such as a liquid crystal display apparatus for the purpose of effectively avoiding reflection of external light.
    Type: Grant
    Filed: August 11, 1995
    Date of Patent: July 29, 1997
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hidemi Matsuda, Takeo Itou, Hisashi Chigusa, Michiyo Abe
  • Patent number: 5652477
    Abstract: For use on the outer surface of a faceplate of a display device such as of the cathode ray tube (CRT) type, a first inner antistatic layer of Sb--SnO.sub.2 (particle size between 5-20 nm) is applied to a thickness in the range of 200-600 nm. The Sb--SnO.sub.2 layer has a high light refractive index (n.sub.1 =1.8) and also provides an antireflection function. After pre-heating the faceplate to a temperature in the range of 35.degree.-50.degree. C., a second intermediate antireflection layer of colloidal TiO.sub.2 (light refractive index n.sub.2 =2.0 and particle size between 5-50 nm) is applied over the first inner layer to a thickness of 100-200 nm. A third outer antireflection layer is then applied over the intermediate layer in the form of a silica gel coating at a temperature in the range of 35.degree.-45.degree. C. with a thickness in the range of 100-200 nm and a light refractive index n.sub.3. The second and third antireflective layers follow the 1/4 wavelength rule, where n.sub.3 .perspectiveto..
    Type: Grant
    Filed: November 8, 1995
    Date of Patent: July 29, 1997
    Assignee: Chunghwa Picture Tubes, Ltd.
    Inventors: Hua-Sou Tong, Chung-Min Hu, Mi-Yui Hsu
  • Patent number: 5635793
    Abstract: A cathode-ray tube includes an envelope in which a panel portion, a funnel portion, and a neck portion are integrally formed, and a conductor film and a deflecting yoke mounted on an outer surface of the funnel portion. A strip-type electric field reducing piece has a coated portion coated with an insulator, and an exposed conductive material portion. The coated portion is disposed between the funnel portion and the deflecting yoke, and the conductive material portion is connected to the conductor film.
    Type: Grant
    Filed: June 27, 1996
    Date of Patent: June 3, 1997
    Assignees: Nitto Denko Corporation, Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masatoshi Ochiai, Seiichi Takaoka, Hidenori Takita, Tatsuhiro Hirakawa, Shinji Nohara
  • Patent number: 5621268
    Abstract: A shielding device for blocking electromagnetic waves emitted from a deflection yoke which has a predetermined magnetic permeability and includes at least one shielding plate coaxially disposed on in the neck of the deflection yoke, to thereby simplify assembly and enhance productivity.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: April 15, 1997
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Sung-pyo Hong
  • Patent number: 5621273
    Abstract: Electrically insulating surfaces of a cathode ray tube are covered with a film of an organic material (211). This improves the high-voltage behavior of the cathode ray tube. The film is applied by a method in which a solution comprising an organic material is applied, which is allowed to dry and is subsequently caused to decompose partly.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: April 15, 1997
    Assignee: U.S. Philips Corporation
    Inventor: Gerardus A. H. M. Vrijssen
  • Patent number: 5614789
    Abstract: The present invention is concerned with a method and an arrangement relating to visual display units, preferably a picture tube (1), for reducing to a minimum the electrical alternating fields generated by the display unit in the unit surroundings. The visual display unit is provided with a voltage connected part (5) on which undesirable voltage variations occur. These voltage variations are indicated. A signal which is phase inverted in relation to the indicated voltage variations is generated. The generated phase-inverted signal is fed back to the voltage connected part (5), to compensate for the voltage variations.
    Type: Grant
    Filed: June 29, 1994
    Date of Patent: March 25, 1997
    Inventor: Robert Kristiansson
  • Patent number: 5580662
    Abstract: An antistatic coating for the outer surface of a video display panel such as of a cathode ray tube (CRT), and a method of applying this type of surface coating, employs a conventional antistatic material such as antimony doped tin oxide to which is added a solvent which is (1) soluble in water and alcohol, (2) has an evaporation point higher than that of water, and (3) has greater solubility for oil-based contaminants than for water. Solvents having these characteristics and which are adapted for use in the antistatic coating include ethylene glycol and dimethyl-based solvents, and their derivatives. The antistatic coating has reduced susceptibility to picking up surface contaminants such as dust and wiping residues such as applied in cleaning the display panel, particularly during manufacture, while affording a high degree of static charge dissipation.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: December 3, 1996
    Assignee: Chunghwa Picture Tubes, Ltd.
    Inventors: Hua-Sou Tong, Chung-Min Hu, Yu-Chung Yu
  • Patent number: 5578377
    Abstract: A coating solution for forming a colored thin film, which contains a metal oxide containing nitrogen.
    Type: Grant
    Filed: April 21, 1994
    Date of Patent: November 26, 1996
    Assignee: Asahi Glass Company Ltd.
    Inventors: Takeshi Morimoto, Kazuya Hiratsuka, Yasuhiro Sanada, Keiko Ohashi, Keisuke Abe, Takeshi Kawasato
  • Patent number: 5572086
    Abstract: The outer surface of the glass display panel of a cathode ray tube (CRT) is first coated with an antistatic conductive metal salt solution. A water or organic solvent soluble antireflective coating is then applied by conventional means such as spinning, spraying or dipping to the glass display panel over the first coating. The antireflective coating is comprised of either an organic or an inorganic salt, or a polymer. The coated display panel is then baked, followed by thorough washing with either water in the case of an organic or inorganic salt or water soluble polymer antireflective coating, or toluene in the case of a non-water soluble polymer antireflective coating. Washing the display panel partially dissolves the salt or polymer in the antireflective coating more on the outer surface of the coating than on the inner portion of the coat adjacent the glass facelate.
    Type: Grant
    Filed: May 18, 1995
    Date of Patent: November 5, 1996
    Assignee: Chunghwa Picture Tubes, Ltd.
    Inventors: Hua-Sou Tong, Chun-Min Hu, Yu-Chung Yu
  • Patent number: 5572087
    Abstract: Electrically insulating surfaces of an image intensifier are covered with a film of an organic material. This improves the high-voltage behavior of the image intensifier. The image intensifier further has an anode hung by means of insulating rods, which rods are covered by the film.
    Type: Grant
    Filed: June 28, 1993
    Date of Patent: November 5, 1996
    Assignee: U.S. Philips Corporation
    Inventor: Gerardus A. H. M. Vrijssen
  • Patent number: 5557161
    Abstract: Color display tube of the 3-in-line type having a display screen with a pattern of phosphor rows. The display tube has a shield with two long walls, two short walls and one gun-sided aperture. Viewed at least in projection, at least one area having a decreased magnetic permeability and extending in the longitudinal direction of the tube between the edges of the wall and the aperture is present in the material of each long wall.
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: September 17, 1996
    Assignee: U.S. Philips Corporation
    Inventor: Adrianus J. Van Mensvoort
  • Patent number: 5550429
    Abstract: On the outer surface of a glass face panel 1 of a display device, a first layer 2 of an electrically conductive transparent thin film having a high refractive index, and a second layer 3 and a third layer 4 having a low refractive index are deposited as an anti-reflection film. The first layer 2 is formed to have a thickness in a range of 10-20 nm, whereby the surface of the anti-reflection film has a luminous reflectance of 1.5% or less, and a reflectance of 3% or less at a wavelength of 436 nm most prominent light of blue.
    Type: Grant
    Filed: December 27, 1994
    Date of Patent: August 27, 1996
    Assignee: Matsushita Electronics Corporation
    Inventors: Hidekazu Hayama, Yasunori Miura, Atsushi Suzuki, Keizou Ishiai
  • Patent number: 5543769
    Abstract: The superconducting magnetic switch or fast kicker magnet is employed with electron stream or a bunch of electrons to rapidly change the direction of flow of the electron stream or bunch of electrons. The apparatus employs a beam tube which is coated with a film of superconducting material. The tube is cooled to a temperature below the superconducting transition temperature and is subjected to a constant magnetic field which is produced by an external dc magnet. The magnetic field produced by the dc magnet is less than the critical field for the superconducting material, thus, creating a Meissner Effect condition. A controllable fast electromagnet is used to provide a magnetic field which supplements that of the dc magnet so that when the fast magnet is energized the combined magnetic field is now greater that the critical field and the superconducting material returns to its normal state allowing the magnetic field to penetrate the tube.
    Type: Grant
    Filed: January 11, 1995
    Date of Patent: August 6, 1996
    Assignee: The United States of America as represented by the Department of Energy
    Inventors: Yehuda Goren, Narayan K. Mahale
  • Patent number: 5536994
    Abstract: The inner surface of a video display panel such as cathode ray tube (CRT) glass faceplate is initially coated with a mixture of one of the primary color phosphors, an organic binder such as polyvinyl alcohol (PVA) diluted with water, and a photoresist agent. The organic binder overcomes the poor adhesion to the glass faceplate of the photoresist which typically includes polyvinyl pyrrolidone (PVP) and reduces the oxygen which decreases phosphor exposure time. To overcome PVA and PVP incompatibilities which give rise to nonuniform film thickness, a vinyl pyrrolidone-vinyl alcohol (VP-VA) copolymer is added to the phosphor, organic binder and photoresist mixture in the range of 0.1-30 wt %. The copolymer with both the VP and VA functioning groups serves as a coupling agent between the PVA and PVP and eliminates incompatibilities between these components. The VP-VA copolymer preferably has a VP/VA mole ratio in the range of 20/80 to 80/20.
    Type: Grant
    Filed: April 19, 1995
    Date of Patent: July 16, 1996
    Assignee: Chunghwa Picture Tubes, Ltd.
    Inventors: Hua-Sou Tong, Chun-Min Hu, Yu-Chung Yu
  • Patent number: 5536997
    Abstract: A cathode ray tube in which a glass-enamel layer having particles with a secondary electron emission coefficient smaller than 1, for example Cr.sub.2 O.sub.3 particles, is provided in the neck. The percentage of particles exceeds approximately 30% and the surface resistance or resistivity ranges between 10.sup.10 and 10.sup.14 .OMEGA./.quadrature.. The high-voltage behavior of such a layer is satisfactory. The convergence drift is relatively small. In addition, a description is given of a method of providing such a glass-enamel layer.
    Type: Grant
    Filed: April 17, 1992
    Date of Patent: July 16, 1996
    Assignee: U.S. Philips Corporation
    Inventor: Leonardus Th. M. Van Hout
  • Patent number: 5534748
    Abstract: The display screen (3) of a cathode ray tube (1) is provided with a light-absorbing coating (8) comprising a hybrid inorganic-organic material consisting of an inorganic network of at least silicon oxide and a polymeric component. By means of a sol-gel process the coating can be provided in a relatively large thickness without causing crackles. Consequently, the layer can contain large quantities of dyestuff, so that said layer can very suitably be used as a chrominance or transmission coating to improve the picture contrast. Even if the display screen is not highly polished, the coating can be obtained with a high-polish and it complies with the customary mechanical, chemical and optical requirements.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: July 9, 1996
    Assignee: U.S. Philips Corporation
    Inventor: Emmanuel W. J. L. Oomen
  • Patent number: 5530316
    Abstract: Provided is a color cathode-ray tube with a magnetic shield member which is capable of efficiently reducing only the amount of mislanding caused by the external magnetic field applied in one direction by effectively utilizing the shape effect of a magnetic substance and which can be readily designed. A U-shaped magnetic substance is formed by curving an elongated magnetic substance into a U-like shape. One end of the U-shaped magnetic substance is fixed to a long side wall side of a frame, while the other end thereof extends toward an electron gun. The U-shaped magnetic substance is magnetized therealong due to the shape effect thereof, concentrating an induction field on the area surrounded by the U-shaped magnetic substance. Thus, a great shield effect can be obtained. Further, the U-shaped magnetic substance is readily magnetized in a special direction due to its shape anisotropy.
    Type: Grant
    Filed: July 20, 1993
    Date of Patent: June 25, 1996
    Assignees: Tohoku Gakuin University, Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akira Haga, Hiroshi Nasuno, Keisuke Yamane
  • Patent number: 5528100
    Abstract: A flat cathode-ray tube in which a ceramics film or a glass film is formed by thermal spray on the coupled surface of a metal case. This assembly and a glass screen are coupled through crystallized frit glass or by glass fusion. The coupling between the metal case and the glass screen has a coupling strength sufficient to resist the vacuum stress. The metal case, which is not exposed for a long time to high temperatures during thermal spraying, can be made of a metal for realizing a lightweight without any thermal deformation or dimensional variations, thereby attaining satisfactory mechanical properties.
    Type: Grant
    Filed: July 5, 1994
    Date of Patent: June 18, 1996
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shunichi Igeta, Koji Nakamura, Makoto Ishizuka, Tsunehiko Sugawara, Otojiro Kida
  • Patent number: 5523649
    Abstract: A multilayer antireflective coating is applied to the outer surface of a video display panel such as a cathode ray tube (CRT) or a flat panel display in the form of successive thin layers each having a different light refractive index, where the light refractive index of each layer decreases in the direction away from the surface of the display panel and toward the outer layer of the coating. Each layer is formed from the same starting gel materials, with the degree of crosslinking of each gel layer varied to provide the desired light refractive index for reducing reflections from the display panel's outer surface over a wide spectrum. The extent of crosslinking and thus the individual layer's light refractive index is varied by controlling the aging of the gel, with longer aging providing increased crosslinking and larger molecular weight for a lower light refractive index. For example, silica gels aged over different time periods provide gels having a light refractive index ranging from 1.
    Type: Grant
    Filed: November 8, 1994
    Date of Patent: June 4, 1996
    Assignee: Chunghwa Picture Tubes, Ltd.
    Inventors: Hua-Sou Tong, Chun-Min Hu
  • Patent number: 5520855
    Abstract: A coating solution composition for forming a glass gel thin film, contains at least one material selected from the group consisting of a metal alkoxide and a polycondensate of the metal alkoxide, a coloring material, an alcohol solvent, and a dispersant having an adsorption material for the coloring material, soluble in the alcohol solvent, and having miscibility with the metal alkoxide, wherein the coloring material has an average particle size of 3 nm to 300 nm. A glass gel thin film obtained by sintering this composition at a temperature of 100.degree. to 300.degree. C. is excellent in water resistance, durability and has a high strength.
    Type: Grant
    Filed: March 19, 1992
    Date of Patent: May 28, 1996
    Assignees: Kabushiki Kaisha Toshiba, Fuji Pigment Co., Ltd.
    Inventors: Takeo Ito, Hidemi Matsuda, Kazuo Sakai
  • Patent number: RE35318
    Abstract: A viewing screen protective shield is set forth removably securable in association with a viewing screen, such as LCR screens, as found in fish finders and the like, which are typically exposed to adverse weather conditions. The protective shield is readily removable and replaceable and include convex peripheral edges to conform the shield to the convex screen with an outwardly extending tab formed outwardly of a single corner of the shield to enhance manual grasping thereof. To enhance securement of the shield to the associated screen, a plurality of transparent adhesive strips may be secured to an interior surface of the shield to enhance securement of the transparent shield to the associated screen.
    Type: Grant
    Filed: July 19, 1994
    Date of Patent: August 27, 1996
    Inventor: William J. Warman