Patents by Inventor Keizo Suzuki

Keizo Suzuki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8747763
    Abstract: In order to provide a plasma sterilization apparatus with high plasma generation efficiency, the apparatus includes first and second electrodes (3, 2), a first dielectric body layer (1), and an insulating spacer (6). The first dielectric body layer (1) is disposed between the first and second electrodes (3, 2). The insulating spacer (6) is disposed between the first electrode (3) and the first dielectric body layer (1). The insulating spacer (6) has a lower permittivity than a permittivity of the first dielectric body layer (1).
    Type: Grant
    Filed: April 6, 2012
    Date of Patent: June 10, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Takumi Tandou, Nobuyuki Negishi, Hiroyuki Kobayashi, Keizo Suzuki
  • Publication number: 20120263628
    Abstract: In order to provide a plasma sterilization apparatus with high plasma generation efficiency, the apparatus includes first and second electrodes (3, 2), a first dielectric body layer (1), and an insulating spacer (6). The first dielectric body layer (1) is disposed between the first and second electrodes (3, 2). The insulating spacer (6) is disposed between the first electrode (3) and the first dielectric body layer (1). The insulating spacer (6) has a lower permittivity than a permittivity of the first dielectric body layer (1).
    Type: Application
    Filed: April 6, 2012
    Publication date: October 18, 2012
    Applicant: Hitachi, Ltd.
    Inventors: Takumi TANDOU, Nobuyuki Negishi, Hiroyuki Kobayashi, Keizo Suzuki
  • Patent number: 8094093
    Abstract: A AC type plasma display apparatus has been disclosed, which satisfies various requirements such as the number of gradations that can be displayed, the display luminance, and the upper limit of power and, further, the efficiency of light emission and the luminance can be increased as much as possible and the display quality of which is not deteriorated. In the plasma display apparatus, a frame is composed of plural subfields, an image is displayed by causing a sustain discharge to occur in each subfield, the sustain discharge can be caused to occur by at least a first sustain waveform and a second sustain waveform different from the first sustain waveform, and the ratio of the first sustain waveform to the second sustain waveform changes, both waveforms being used to cause the sustain discharge to occur in each subfield.
    Type: Grant
    Filed: July 17, 2008
    Date of Patent: January 10, 2012
    Assignees: Hitachi Plasma Display Limited, Hitachi Plasma Patent Licensing Co., Ltd.
    Inventors: Takashi Sasaki, Yuichiro Kimura, Yasunobu Hashimoto, Keizo Suzuki, Kenichi Yamamoto
  • Patent number: 8085220
    Abstract: A plasma display apparatus having a priming discharge region PDC partitioned from a display discharge cell DDC, by a traverse rib, at a side where the second electrode between the display discharge cell DDC adjacent in a row direction is adjacent; a second longitudinal rib partitioning the priming discharge region PDC; a third longitudinal rib, further partitioning a region partitioned by the second longitudinal rib into two sections; a convex electrode; and a gap connecting the display discharge cell DDC and the priming discharge cell PDC, wherein a sum of a width in a line direction of a nearly rectangular space region containing adjacent two priming discharge cells PDCs, and a pattern width of the second longitudinal rib is designed larger than a sum of a width in the row direction and a pattern width of the traverse rib.
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: December 27, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Shunichiro Nobuki, Norihiro Uemura, Masakazu Sagawa, Keizo Suzuki, Yoshiro Mikami, Hideto Momose, Shirun Ho
  • Publication number: 20110253313
    Abstract: The present invention provides a plasma processing apparatus in which a plasma distribution, a plasma potential, an etching characteristic or a surface processing characteristic varies in time and spatially, and controllability and reliability are high. In the plasma processing apparatus, at least part of a discharge forming electromagnetic wave is introduced into a processing chamber through a transmission electrode. The transmission electrode is provided with a transmission electrode layer as at least part of constituent elements therefor. Slender-shaped slot opening areas are densely formed in the transmission electrode layer. The transmission electrode behaves like a material having electrical conductivity for an RF bias electromagnetic wave or ion plasma vibrations, thereby implementing high stability and high reliability of plasma characteristics and plasma processing characteristics.
    Type: Application
    Filed: August 12, 2010
    Publication date: October 20, 2011
    Inventors: Keizo SUZUKI, Ken Takei, Takehito Usui, Masami Kamibayashi, Nobuyuki Negishi
  • Publication number: 20110253672
    Abstract: The present invention is intended to improve the uniformity in a distribution function of incident ion energy inside a wafer surface, and realize uniform plasma processing (etching or the like) inside the wafer surface. In a plasma processing apparatus, a bias application portion of a placement electrode on which a wafer is placed is divided into an inner electrode and an outer electrode at positions near the center of the wafer and the edge thereof. Each of a first bias power and a second bias power to be used to accelerate ions incident on the wafer is bifurcated, and the resultant bias powers are fed to the inner electrode and outer electrode using a power distributor by adjusting the power ratio.
    Type: Application
    Filed: August 12, 2010
    Publication date: October 20, 2011
    Inventors: Masami Kamibayashi, Masahito Mori, Hiroyuki Kobayashi, Keizo Suzuki, Naoyuki Kofuji
  • Patent number: 8009122
    Abstract: A plasma display device includes a plasma display panel provided with plural discharge cells each having discharge gas, a pair of sustain electrodes which generate sustain discharge, and a phosphor, and a driving circuit which applies a sustain pulse voltage between the pair of sustain electrodes for generating the sustain discharge. The sustain pulse voltage is formed of a first portion having a main portion of a first voltage Vp and a second portion succeeding the first portion in time and having a main portion of a second voltage Vs higher than the first voltage Vp, the sustain discharge is formed of a pre-discharge and a main discharge succeeding the pre-discharge in time, and the first voltage Vp is selected to satisfy Vpmin?Vp<Vs, where Vpmin is a minimum of the first voltage Vp which stabilizes the sustain discharge.
    Type: Grant
    Filed: August 31, 2006
    Date of Patent: August 30, 2011
    Assignee: Hiachi, Ltd.
    Inventors: Kenichi Yamamoto, Keizo Suzuki
  • Patent number: 7994717
    Abstract: A high-luminance plasma display panel has a plurality of discharge cells including a phosphor film emitting visible rays by excitation caused by ultraviolet light generated by the discharge of a discharge gas. The phosphor film has at least two layers of a phosphor layer and a reflecting layer, and the phosphor layer is arranged closer to the discharge space side than the reflecting layer. A film thickness Wt of the phosphor film is 40 ?m or less, and a film thickness Wp of the phosphor layer, a particle diameter dp of a phosphor that is at least a part of components of the phosphor layer, a film thickness Wr of the reflecting layer, and a particle diameter dr of a reflecting material that is at least a part of components of the reflecting layer satisfy 2dp?Wp?5dp and 2dr?Wr?Wt?Wp.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: August 9, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Kenji Okishiro, Keizo Suzuki, Tatsuya Miyake, Choichiro Okazaki
  • Publication number: 20110062866
    Abstract: A protective layer has, on its back side, an electron emissive layer formed of magnesium oxide crystals. Based on a front view of discharge cells C, there are defined intersection regions (first regions) where display electrode pairs (each including a sustain electrode X and a scan electrode Y) and address electrodes Z intersect and a remaining region (a second region) E1 excluding the intersection regions. The surface density of the magnesium oxide crystals forming the electron emissive layer over the intersection regions (the first regions) is equal to or lower than half the surface density of the magnesium oxide crystals forming the electron emissive layer over the remaining region (the second region) E1 excluding the intersection regions.
    Type: Application
    Filed: August 5, 2010
    Publication date: March 17, 2011
    Applicant: HITACHI CONSUMER ELECTRONICS CO., LTD.
    Inventors: Takeshi TAMAKOSHI, Mitsuharu IKEDA, Keizo SUZUKI, Shirun HO, Yoshiro MIKAMI
  • Publication number: 20110030899
    Abstract: At least a part of a discharging electromagnetic wave is introduced into a processing chamber via a transmission electrode which has characteristics to behave as a dielectric (electric insulator) for the discharging electromagnetic wave, and to behave as a material with electric conductivity for RF bias electromagnetic wave of electromagnetic wave of ion plasma oscillation.
    Type: Application
    Filed: February 19, 2010
    Publication date: February 10, 2011
    Inventors: Keizo SUZUKI, Masaru Izawa, Nobuyuki Negishi, Kenetsu Yokogawa, Kenji Maeda
  • Patent number: 7781973
    Abstract: A plasma display panel has plural discharge cells between two opposing first and second substrates. Each of the discharge cells includes at least one pair of electrodes for generating a discharge for display, a discharge gas and a phosphor film for emitting visible light by being excited by ultraviolet rays produced by the discharge of the discharge gas. Laminated members are dispersed in a plane within each of the discharge cells inside the first substrate from which visible light for display is emitted, and each of the laminated members includes a light absorption layer disposed on a side of the first substrate on which ambient light is incident and a light reflection layer disposed on a phosphor-film side of the laminated members. A visible-light-reflection layer is disposed on a surface of the phosphor film on a side thereof opposite from a space in which the discharge is generated.
    Type: Grant
    Filed: August 23, 2005
    Date of Patent: August 24, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Tatsuya Miyake, Keizo Suzuki, Masatoshi Shiiki, Choichiro Okazaki, Tsuyoshi Fujita, Seiichi Tsuchida
  • Patent number: 7746295
    Abstract: There is provided a plasma display device capable of high luminous efficacy and stable driving for displaying images at various image display load factors. The plasma display device performs the sustain discharge for a light-emission display, and is configured to apply a sustain pulse voltage between a sustain electrode pair in a respective one of the plural discharge cells to generate a sustain discharge in a respective one of the following operating modes selected based upon use of the plasma display device: (a) generating a pre-discharge and then a main discharge; (b) generating a main discharge without a pre-discharge preceding the main discharge; and (c) switching between the mode (a) and the mode (b). The sustain voltage waveforms are used which compensate for an increase in voltage drop due to an increase in discharge current when the image display load factor is excessively increased.
    Type: Grant
    Filed: October 20, 2006
    Date of Patent: June 29, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Kenichi Yamamoto, Keizo Suzuki, Masatoshi Shiiki, Kyoji Kariya, Tomokatsu Kishi, Tetsuya Sakamoto, Takashi Sasaki, Takayuki Shimizu
  • Publication number: 20100096975
    Abstract: In order to reduce the discharge delay time and increase the image quality in a display device such as a PDP using ultraviolet light emission produced by discharge, there is provided a display device including: a front panel and a rear panel disposed opposite to each other with discharge spaces formed therebetween, and a discharge gas being injected into the discharge spaces; at least a pair of electrodes for performing a display discharge; and phosphor layers emitting visible light by using ultraviolet light emission produced by discharge of the discharge gas. At least one of the compounds represented by the composition formulas Cs(1?x)M1xAl02 (where M1 is the I group element, 0?5x<1) and Cs(1?x)M2xAl(1+x)O(2+2x) (where M2 is the II group element, 0?x<1) is present in any of the components constituting the discharge spaces of the display device.
    Type: Application
    Filed: October 14, 2009
    Publication date: April 22, 2010
    Applicant: HITACHI CONSUMER ELECTRONICS CO., LTD.
    Inventors: Shin IMAMURA, Tatsuya MIYAKE, Shunsuke MORI, Kazutaka TSUJI, Keizo SUZUKI, Toshiaki KUSUNOKI, Mitsuharu IKEDA, Shirun HO
  • Publication number: 20100090582
    Abstract: A high-luminance plasma display panel has at least has a plurality of discharge cells including a phosphor film emitting visible rays by excitation caused by ultraviolet light generated by the discharge of a discharge gas. The phosphor film has at least two layers of a phosphor layer and a reflecting layer, and the phosphor layer is arranged closer to the discharge space side than the reflecting layer. A film thickness Wt of the phosphor film is 40 ?m or less, and a film thickness Wp of the phosphor layer, a particle diameter dp of a phosphor that is at least a part of components of the phosphor layer, a film thickness Wr of the reflecting layer, and a particle diameter dr of a reflecting material that is at least a part of components of the reflecting layer satisfy 2dp?Wp?5dp and 2dr?Wr?Wt?Wp.
    Type: Application
    Filed: December 12, 2006
    Publication date: April 15, 2010
    Applicant: HITACHI, LTD.
    Inventors: Kenji Okishiro, Keizo Suzuki, Tatsuya Miyake, Choichiro Okazaki
  • Publication number: 20090284521
    Abstract: A plasma display device of high luminous efficiency is provided. In a plasma display device for performing driving including at least an address period and a sustain-discharge period for emission display, the sustain-discharge period includes a pulse application period and an open period, a voltage of an electrode to which a relatively positive voltage is applied in a sustain-discharge electrode pair in a pulse application period immediately before the open period is set as Vsp, and the voltage of the other electrode is set as Vsn, Vsp-Vsn has a significantly negative value in the open period, and light is emitted by a discharge in the open period.
    Type: Application
    Filed: July 22, 2009
    Publication date: November 19, 2009
    Inventors: Kenichi YAMAMOTO, Keizo Suzuki, Hiroshi Kajiyama, Shirun Ho, Tomokatsu Kishi, Kyoji Kariya
  • Patent number: 7605540
    Abstract: A plasma display panel has plurality discharge cells disposed between a pair of opposing first and second substrates. Each of the discharge cells includes at least: at least one pair of electrodes for generating a discharge for display; a discharge gas; and a phosphor film for emitting visible light by being excited by ultraviolet light produced by the discharge of the discharge gas. Laminated members are dispersed in a plane within each of the discharge cells inside the first substrate from which visible light for display is emitted. Each of the laminated members includes a light absorption layer disposed on a side of the first substrate on which ambient light is incident and a light reflection layer disposed on a phosphor-film side of each of the laminated members.
    Type: Grant
    Filed: February 23, 2005
    Date of Patent: October 20, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Choichiro Okazaki, Masatoshi Shiiki, Keizo Suzuki, Kenichi Yamamoto
  • Publication number: 20090230836
    Abstract: Provided is a display device such as a plasma display device including a front plate and a rear plate arranged opposing to each other to form a discharge space, where a discharge gas filled inside the discharge space, and at least a pair of electrodes for performing a display discharge and a phosphor layer for emitting visible light by an ultraviolet ray emission by the discharge of the discharge gas are provided. Inside the discharge space, a material whose main composition is alumina oxychloride of a group IIa metal and/or a group IIb metal is at least partly contained. Accordingly, a sustain discharge voltage can be reduced.
    Type: Application
    Filed: February 24, 2009
    Publication date: September 17, 2009
    Inventors: Shin Imamura, Shunsuke Mori, Tatsuya Miyake, Hideto Momose, Kazutaka Tsuji, Ryo Inoue, Shirun Ho, Keizo Suzuki
  • Publication number: 20090225008
    Abstract: A plasma display apparatus having a priming discharge region PDC partitioned from a display discharge cell DDC, by a traverse rib, at a side where the second electrode between the display discharge cell DDC adjacent in a row direction is adjacent; a second longitudinal rib partitioning the priming discharge region PDC; a third longitudinal rib, further partitioning a region partitioned by the second longitudinal rib into two sections; a convex electrode; and a gap connecting the display discharge cell DDC and the priming discharge cell PDC, wherein a sum of a width in a line direction of a nearly rectangular space region containing adjacent two priming discharge cells PDCs, and a pattern width of the second longitudinal rib is designed larger than a sum of a width in the row direction and a pattern width of the traverse rib.
    Type: Application
    Filed: November 26, 2008
    Publication date: September 10, 2009
    Inventors: Shunichiro Nobuki, Norihiro Uemura, Masakazu Sagawa, Keizo Suzuki, Yoshiro Mikami, Hideto Momose, Shirun Ho
  • Publication number: 20090184895
    Abstract: A high-definition, high-quality, and high-contrast PDP that features high brightness, guaranteed long life, and stable driving, is provided by improving the time-dependent degradation of address discharge delay. The PDP includes: a front substrate having bus electrodes, and sustain discharge electrodes extending in a lateral direction of the bus electrodes to form display lines; a back substrate having address electrodes facing the sustain discharge electrodes in the lateral direction of the bus electrodes; and discharge cells formed between the substrates. Each of the discharge cells includes a sustain discharge cell and a priming discharge cell, in which a protruding electrode is formed to extend in a direction opposite to the discharge gap from the bus electrode, and a predetermined space is provided between the two cells to supply priming. The shape and size of the space are optimized so that the sustain discharge does not spread to the address discharge cell through the space.
    Type: Application
    Filed: December 29, 2008
    Publication date: July 23, 2009
    Inventors: Norihiro Uemura, Shunichiro Nobuki, Masakazu Sagawa, Shirun Ho, Keizo Suzuki, Yoshiro Mikami
  • Publication number: 20090153050
    Abstract: A high-quality long-life plasma display panel is provided by enabling compatibility between priming-electron emission characteristics, and other characteristics such as sputtering resistance, secondary electron emission characteristics, and wall charge retention. The plasma display panel is structured to include a front substrate, transparent electrodes and bus electrodes provided on the inner side of the front substrate, a dielectric layer covering these electrodes, a first protective layer covering the dielectric layer, and a second protective layer disposed on the side closer to the discharge space than the first protective layer. The first protective layer is doped with Sc to generate a predetermined excitation light by incidence of ultraviolet light. The second protective layer is doped with Si to emit electrons to the discharge space by the excitation light. With this structure, it is possible to realize a plasma display device in which the discharge delay is small, thereby the fluctuation less occurs.
    Type: Application
    Filed: December 16, 2008
    Publication date: June 18, 2009
    Inventors: Kazutaka Tsuji, Ryo Inoue, Shunsuke Mori, Masaaki Komatsu, Tatsuya Miyake, Keizo Suzuki, Hideto Momose, Shirun Ho