Patents by Inventor Takashi Enomoto

Takashi Enomoto 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).

  • Zoom lens system
    Patent number: 6813090
    Abstract: A zoom lens system includes a positive first lens group, a positive second lens group, and a negative third lens group. Zooming is performed by moving the first, second and third lens groups in the optical axis direction. The positive first lens group is constituted by a negative lens element and a positive lens element. The zoom lens system satisfies the following condition: 0.15<&Sgr;d2G/fW<0.28  (1) wherein &Sgr;d2G designates the distance from the most object-side surface of the positive second lens group to the most image-side surface thereof; and fW designates the focal length of the entire zoom lens system at the short focal length extremity.
    Type: Grant
    Filed: August 15, 2002
    Date of Patent: November 2, 2004
    Assignee: PENTAX Corporation
    Inventor: Takashi Enomoto
  • Dry etching method
    Publication number: 20040214445
    Abstract: A dry etching method involving etching an organic antireflection film 104 through a mask layer 105 having a predetermined pattern, characterized in that the organic antireflection film is etched by the plasma etching using an etching gas comprising CF4 and O2. The method allows an organic antireflection film to be etched in such a manner that the etched film exhibits a sidewall portion having a better shape as compared to that formed by a conventional technique.
    Type: Application
    Filed: May 18, 2004
    Publication date: October 28, 2004
    Inventors: Akitaka Shimizu, Takashi Tsuruta, Takashi Enomoto, Hiromi Oka, Akiteru Koh
  • Electron source and image display device
    Patent number: 6762542
    Abstract: An electron source includes a substrate, a coating layer provided on the substrate, plural electron emission elements disposed on the coating layer, and a metal for connecting the plural electron emission elements. The electron emission element includes a conductive film including the electron emission part disposed on the coating layer, with the conductive film being connected to a wiring line with a conductive member for blocking the metals contained in the wiring lines from being transferred to the conductive film.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: July 13, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kouki Nukanobu, Takashi Enomoto, Keishi Danjo
  • Zoom lens system
    Publication number: 20040105165
    Abstract: A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a negative fourth lens group. Zooming is performed by moving each of the positive first through the negative fourth lens groups along the optical axis.
    Type: Application
    Filed: November 26, 2003
    Publication date: June 3, 2004
    Applicant: PENTAX Corporation
    Inventor: Takashi Enomoto
  • ZOOM LENS SYSTEM
    Publication number: 20040105166
    Abstract: A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a negative fourth lens group.
    Type: Application
    Filed: November 26, 2003
    Publication date: June 3, 2004
    Applicant: PENTAX Corporation
    Inventor: Takashi Enomoto
  • Zoom lens system and a focusing method thereof
    Patent number: 6735021
    Abstract: A zoom lens system includes a positive first lens group, a positive second lens group, and a negative third lens group. Upon zooming from the short toward the long focal length extremities, the three lens groups are moved independently along the optical axis so that the distance between the first and second lens groups increases, and the distance between the second and third lens groups decreases. The first lens group and the second lens group which are independently moved upon zooming are integrally moved upon focusing.
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: May 11, 2004
    Assignee: PENTAX Corporation
    Inventor: Takashi Enomoto
  • Image display apparatus and manufacturing method and manufacturing apparatus for image display apparatus
    Publication number: 20040080261
    Abstract: An image display apparatus includes an envelope which has a front substrate and a rear substrate opposed to each other and individually having peripheral edge portions sealed together. A sealed portion is sealed by a sealing member. the sealing member has electrical conductivity and melts when supplied with current. After the sealing member in the sealed portion is supplied with current and melted during manufacture, the current supply is stopped to cool and solidify the sealing member, whereupon the respective peripheral edge portions of the front substrate and the rear substrate are selected together.
    Type: Application
    Filed: October 23, 2003
    Publication date: April 29, 2004
    Inventors: Masahiro Yokota, Takashi Enomoto, Takashi Nishimura, Akiyoshi Yamada, Shouichi Yokoyama
  • Zoom lens system
    Patent number: 6721107
    Abstract: A zoom lens system includes a negative first lens group, a positive second lens group, and a negative third lens group. Zooming is performed by moving the first through third lens groups in the optical axis direction. The negative first lens group is constituted by a negative single lens element having a concave surface facing toward the object, and satisfies the following condition: −1<r1/fW<0  (1) wherein r1 designates the radius of curvature of the object-side concave surface of said negative single lens element; and fW designates the focal length of the entire zoom lens system at the short focal length extremity.
    Type: Grant
    Filed: January 22, 2002
    Date of Patent: April 13, 2004
    Assignee: PENTAX Corporation
    Inventor: Takashi Enomoto
  • Zoom lens system
    Publication number: 20040001260
    Abstract: A zoom lens system includes a positive first lens group, a negative second lens group. Zooming is performed by moving the first and second lens groups in the optical axis direction thereof. The most image-side lens element of the positive first lens group includes a positive lens element having at least one aspherical surface.
    Type: Application
    Filed: June 10, 2003
    Publication date: January 1, 2004
    Applicant: PENTAX Corporation
    Inventor: Takashi Enomoto
  • Zoom lens system
    Publication number: 20030231405
    Abstract: A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a negative fourth lens group, in this order from the object. Zooming is performed by moving the positive first through negative fourth lens groups along the optical axis.
    Type: Application
    Filed: June 6, 2003
    Publication date: December 18, 2003
    Applicant: PENTAX Corporation
    Inventor: Takashi Enomoto
  • Zoom lens system
    Patent number: 6618558
    Abstract: Zoom lens system includes a positive first lens group, and a negative second lens group. Zooming is performed by moving the positive first lens group and the negative second lens group in an optical axis direction. The positive first lens group includes a negative first lens element, a second lens element having an aspherical surface on which the curvature is smaller toward the periphery thereof, and a positive third lens element. The negative second lens group includes a positive fourth lens group and a negative fifth lens group. The zoom lens system satisfies the following conditions: −7<fT/f2G<−4.5 −9<fT/f2GN<−7 wherein fT designates the focal length of the entire zoom lens system at the long focal length extremity; f2G designates the focal length of the negative second lens group, and f2GN designates the focal length of the fifth lens element in the negative second lens group.
    Type: Grant
    Filed: August 22, 2002
    Date of Patent: September 9, 2003
    Assignee: Pentax Corporation
    Inventor: Takashi Enomoto
  • Treatment of textile product for imparting water and oil repellency
    Publication number: 20030161953
    Abstract: A textile having durability of maintaining water- and sufficient oil-repellency and soil releasability before and after cleaning can be obtained by a method of preparing a treated textile, having steps of: (1) preparing a treatment liquid containing a water- and oil-repellent agent, (2) adjusting pH of the treatment liquid to at most 7, preferably at most 3, (3) applying the treatment liquid to a textile, (4) treating the textile with steam, and (5) washing the textile with water and dehydrating the textile, wherein the water- and oil-repellent agent is an emulsion containing a fluorine-containing compound and an emulsifier, the fluorine-containing compound is a fluorine-containing polymer and/or a fluorine-containing low molecular weight compound, and the emulsifier contains an anionic surface active agent having pKa of at least 2.
    Type: Application
    Filed: September 27, 2002
    Publication date: August 28, 2003
    Inventors: Takashi Enomoto, Ikuo Yamamoto, Norihito Otsuki, Teruyuki Fukuda
  • Water and oil repellency treatment of fibre product
    Publication number: 20030115678
    Abstract: A textile having excellent water- and oil-repellency can be obtained by a method of preparing a treated textile, having steps of: (1) preparing a treatment liquid comprising a water- and oil-repellent agent, (2) adjusting pH of the treatment liquid to at most 7, preferably at most 3, (3) applying the treatment liquid to a textile, (4) treating the textile with steam, and (5) washing the textile with water and dehydrating the textile, wherein the water- and oil-repellent agent is at least one fluorine-containing compound selected from the group consisting of a fluorine-containing polymer and a fluorine-containing low molecular weight compound, and the water- and oil-repellent agent or the treatment liquid contains an organic salt.
    Type: Application
    Filed: October 18, 2002
    Publication date: June 26, 2003
    Inventors: Takashi Enomoto, Ikuo Yamamoto, Norihito Otsuki, Teruyuki Fukuda, Kayo Kusumi
  • Treatment of textile product for imparting water and oil repellency
    Publication number: 20030106161
    Abstract: A textile having sufficient water repellency, oil repellency and soil releasability before and after cleaning can be prepared by a method of preparing a treated textile has the steps of (1) preparing a treatment liquid containing a water- and oil-repellent agent and a stain blocking agent, (2) bringing the pH of the treatment liquid to at most 7, (3) applying the treatment liquid to the textile, (4) thermally treating the textile with steam, and (5) washing the textile with water and dehydrating the textile, wherein the water- and oil-repellent agent has a combination of (A) a fluorine-containing polymer comprising a repeat unit derived from vinyl chloride and/or vinylidene chloride, and (B) a fluorine-containing polymer free from a repeat unit derived from vinyl chloride and/or vinylidene chloride.
    Type: Application
    Filed: July 24, 2002
    Publication date: June 12, 2003
    Inventors: Takashi Enomoto, Ikuo Yamamoto, Teruyuki Fukuda, Norihito Otsuki
  • Zoom lens system
    Patent number: 6560035
    Abstract: A zoom lens system including a negative first lens group, a positive second lens group, and a negative third lens group. Zooming is performed by moving the first through third lens. The negative first lens group includes positive-negative cemented lens elements, and the most object-side surface thereof is a concave surface. The zoom lens system satisfies: −1<r1/fW<0 . . . (1); 1.4<f1G/f1N<1.8 . . . (2); wherein r1: the radius of curvature of the most object-side surface of the first lens group; fW: the focal length of the entire zoom lens system at the short focal length extremity; f1G: the focal length of the first lens group; and f1N: the focal length of the lens element of the cemented lens elements.
    Type: Grant
    Filed: February 26, 2001
    Date of Patent: May 6, 2003
    Assignee: Pentax Corporation
    Inventor: Takashi Enomoto
  • Vortex prevention apparatus in pump
    Patent number: 6533543
    Abstract: A vortex prevention apparatus is combined with a pump, and prevents an air entrained vortex or a submerged vortex from being produced when water in the pump pit is pumped up by a pump. A suction member is disposed in an open water channel and has a suction port. An auxiliary flow-path forming structure is disposed substantially concentrically around the suction member with a gap defined between the auxiliary flow-path forming structure and an outer circumferential surface of the suction member.
    Type: Grant
    Filed: January 31, 2001
    Date of Patent: March 18, 2003
    Assignee: Ebara Corporation
    Inventors: Masashi Tagomori, Takashi Enomoto, Tsuyoshi Tomita, Hiroyuki Kato
  • Zoom lens system
    Publication number: 20030048542
    Abstract: A zoom lens system includes a positive first lens group, a positive second lens group, and a negative third lens group. Zooming is performed by moving the first, second and third lens groups in the optical axis direction. The positive first lens group is constituted by a negative lens element and a positive lens element.
    Type: Application
    Filed: August 15, 2002
    Publication date: March 13, 2003
    Applicant: ASAHI KOGAKU KOGYO KABUSHIKI KAISHA
    Inventor: Takashi Enomoto
  • Zoom lens system
    Publication number: 20030049026
    Abstract: A zoom lens system includes a positive first lens group, and a negative second lens group. Zooming is performed by moving the positive first lens group and the negative second lens group in an optical axis direction. The positive first lens group includes a negative first lens element 1a, a second lens element 1b having an aspherical surface on which the curvature is smaller toward the periphery thereof, and a positive third lens element 1c. The negative second lens group includes a positive fourth lens group 2a and a negative fifth lens group 2b.
    Type: Application
    Filed: August 22, 2002
    Publication date: March 13, 2003
    Applicant: ASAHI KOGAKU KOGYO KABUSHIKI KAISHA
    Inventor: Takashi Enomoto
  • Zoom lens system
    Patent number: 6519093
    Abstract: A zoom lens system includes a negative first lens group, a positive second lens group, and a negative third lens group. Zooming is performed by moving the first through third lens groups along the optical axis, and the zoom lens system satisfies: 0.03<(dW12−dT12)/fW<0.1   (1); −4<fT/f1G<−2   (2); wherein dW12 and dT12 designate the distance between the most image-side surface of the first lens group and the most object-side surface of the second lens group, at the short focal length extremity and long focal length extremity, respectively; fW and fT designate the focal length of the entire zoom lens system at the short focal length extremity and the long focal length extremity, respectively; and f1G designates the focal length of the negative first lens group.
    Type: Grant
    Filed: June 18, 2001
    Date of Patent: February 11, 2003
    Assignee: Pentax Corporation
    Inventor: Takashi Enomoto
  • Liquid crystal apparatus
    Patent number: 6496170
    Abstract: A liquid crystal apparatus comprises: a liquid crystal device including a liquid crystal having a spontaneous polarization and causing a state change accompanied with a polarity inversion thereof within a response time. Drive means sequentially selects scanning signal lines each in a scanning selection period and applies data signal voltages to the pixels along an associated scanning signal line, wherein the scanning selection period for a scanning signal line is shorter than the response time for the liquid crystal at a pixel on the scanning signal line thus being liable to leave a remaining portion of polarity inversion to reach a desired state change, and the data signal voltage applied to the pixel is set to include a compensation voltage for compensating for a voltage decrease caused by the remaining portion of polarity inversion.
    Type: Grant
    Filed: April 29, 1999
    Date of Patent: December 17, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akio Yoshida, Katsumi Komiyama, Takashi Enomoto