Patents by Inventor Takashi Mizusawa

Takashi Mizusawa 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: 11073693
    Abstract: In some embodiments, a head mounted display is provided, comprising a light guide, at least first and second diffraction gratings, alignment marks A1 and B1 associated with the first diffraction grating, and alignment marks A2 and B2 associated with the second diffraction grating. The first diffraction grating may be disposed on a first surface of the light guide, the first surface facing away from a light input. The second diffraction grating may be disposed on a second surface of the light guide, the second surface facing towards the light input. The second diffraction grating may be adapted to diffract at least some of the light input into the light guide, and the first diffraction grating may be adapted to diffract at least some light transmitted through the light guide back into the light guide.
    Type: Grant
    Filed: March 6, 2015
    Date of Patent: July 27, 2021
    Assignee: Sony Corporation
    Inventors: Katsuyuki Akutsu, Hideo Nagasaka, Yusuke Kajio, Takashi Mizusawa, Daisuke Tsukuda, Kazutatsu Tokuyama
  • Patent number: 10730571
    Abstract: A crawler includes a crawler main body (a rubber crawler main body (12)), a tensile body (70), guide protrusions (16), and flat surfaces (40). The tensile body (70) is provided with a flat portion (72) that is arranged along a width direction of the crawler main body and a slanting portion (74) that is slanted and arranged at a width direction outer side of the crawler main body relative to the flat portion (72). The guide protrusions (16) are formed at an inner peripheral face of the crawler main body at a width direction middle portion of the crawler main body. The flat surfaces (40) are formed at the width direction outer sides of the crawler main body relative to the guide protrusions (16). Turning wheels (a driving wheel (100), an idling wheel (102) and rolling wheels (104)) provided at a vehicle roll on the flat surfaces (40).
    Type: Grant
    Filed: May 31, 2016
    Date of Patent: August 4, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Takashi Mizusawa, Shingo Sugihara, Kenji Tateishi
  • Patent number: 10633043
    Abstract: An elastic crawler and an elastic crawler drive mechanism collectively suppress the interference between the pin members and the engaging portions, and improve the durability of the engaging portions. The elastic crawler includes on an inner circumferential side thereof a plurality of engaging portions (14) respectively engageable with a plurality of pin members (22) arranged at a spacing in a circumferential direction of a sprocket, wherein: the engaging portions (14) have a pressure receiving surface (14a) which receives the pin members (22), an outline shape in side view of the pressure receiving surface (14a) being formed by an envelope L1 drawn by an outer end of the pin members (22) when the sprocket rolls coaxially with a central axis of a virtual rotor with a rolling diameter D1 defined by D1=(pitch of the engaging portions)×(number of pin members)/(?)×a, and 0.9?a?1, together with the virtual rotor on a plane.
    Type: Grant
    Filed: April 12, 2016
    Date of Patent: April 28, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Takashi Mizusawa
  • Patent number: 10618578
    Abstract: A crawler includes crawler body formed by an elastic body shaped into an endless loop, a tensile body embedded in the crawler body and wound around a circumferential direction of the crawler body, guide projections formed at an inner circumferential surface of a width direction central portion of the crawler body and spaced apart in the circumferential direction of the crawler body, a flat face, upon which a rotating wheel provided at a vehicle rolls, forming an inner circumferential surface further toward a width direction outer side of the crawler body than the guide projections and an inclined face, upon which the rotating wheel rolls, inclined from an outer side end portion of the flat face in a crawler body width direction such that a thickness of the crawler body gradually increases toward the width direction outer side and circumferential inner side of the crawler body.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: April 14, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Shingo Sugihara, Kenji Tateishi, Takashi Mizusawa
  • Publication number: 20190344843
    Abstract: A rubber crawler (10) includes an endless rubber elastic body and protruding lugs (11) formed on the outer peripheral surface at a predetermined pitch in the crawler peripheral direction. The lugs (11) extend to a crawler widthwise end (10b) of the crawler outer peripheral surface (10a). A recess (15) recessed inward in the crawler width direction is formed on the outer end surface (12e) of the crawler widthwise outer end of each lug (11), the outer end surface (12e) facing outward in the crawler width direction. The outline of the recess (15) is separated from the outline of the outer end surface (12e) by a predetermined distance. The opening of the recess (15) has a substantially triangular shape.
    Type: Application
    Filed: January 19, 2018
    Publication date: November 14, 2019
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Takashi MIZUSAWA, Shoko NAGAMOTO
  • Publication number: 20190344844
    Abstract: Provided is an elastic crawler that is easy to produce and has improved mud drainage, without requiring major revision of an existing elastic crawler. The elastic crawler includes a crawler body shaped as an endless belt and lugs (3) arranged at intervals in the peripheral direction on an outer peripheral surface (2a) of the crawler body (2). The lugs (3) each include a kick-in surface (3a) on the kick-in side towards the front in the crawler rotation direction, and the kick-in surface (3a) has a curved shape protruding towards the front in the crawler rotation direction.
    Type: Application
    Filed: January 18, 2018
    Publication date: November 14, 2019
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Takashi MIZUSAWA, Shoko NAGAMOTO
  • Publication number: 20190344842
    Abstract: A rubber crawler (10) includes an endless rubber elastic body and protruding lugs (11) formed on the outer peripheral surface at a predetermined pitch in the crawler peripheral direction. Minute protrusions (14) extending in a direction intersecting the crawler width direction when viewed from the crawler peripheral direction are formed on a first side surface (12a) and a second side surface (12b) of the lugs (11), the side surfaces (12a, 12b) facing the crawler peripheral direction.
    Type: Application
    Filed: January 19, 2018
    Publication date: November 14, 2019
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Takashi MIZUSAWA, Shoko NAGAMOTO
  • Patent number: 10392061
    Abstract: A sprocket (10) is capable of engaging with engaging portions (22) on an elastic endless belt (21). On a tooth face (F) of a tooth (12) of the sprocket (10), a portion of a tooth base on at least one side of a center line (O1) of the tooth (12) is a tooth base surface (12b), and the tooth base surface (12b) is inclined relative to the center line (O1) of the tooth (12) at an angle (A1) in a range of 0° or greater to 7.5° or less so as to approach the center line (O1) of the tooth (12) towards a tooth tip surface (12d).
    Type: Grant
    Filed: February 12, 2016
    Date of Patent: August 27, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Takashi Mizusawa
  • Patent number: 10377433
    Abstract: In an elastic crawler (10) and an elastic crawler drive mechanism (100), at least a portion of the outer edge of an engaging portion (12) has a cross-sectional arc shape such that both the trajectory drawn by the outer edge of the engaging portion (12) from when the engaging portion (12) starts to enter a tooth groove of a sprocket (20) until engagement between the engaging portion (12) and teeth (22) is complete and the trajectory drawn by the outer edge of the engaging portion (12) from when the engaging portion (12) starts to disengage from the teeth (22) until disengagement is complete do not project further outward than the outer edge of the engaging portion (12) when the engagement is complete.
    Type: Grant
    Filed: February 12, 2016
    Date of Patent: August 13, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Takashi Mizusawa
  • Patent number: 10308297
    Abstract: This disclosure is to provide an elastic crawler drive mechanism including an elastic crawler (20) with engaging portions (22) disposed on an endless belt (21), and a sprocket (10) having teeth (12), wherein: engaging surfaces (F2) of the engaging portions (22) have flat engaging planes (22b) in contact with a part of tooth surfaces (F1) of the sprocket (10) when in contact with tooth bottom surfaces (11a) of the sprocket (10), and when the engaging portions (22) are in contact with the tooth bottom surfaces (11a), and simultaneously the engaging planes (22b) are in contact with the tooth surfaces (F1) of the sprocket (10), at least one of the tooth surfaces (F1) of the sprocket (10) and the engaging planes (22b) of the engaging portions (22) form gaps (C) between the tooth surfaces (F1) and the engaging planes (22b), on sides closer to the tooth bottom surfaces (11a) than contact portions (P) of the tooth surfaces (F1) and the engaging planes (22b).
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: June 4, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Takashi Mizusawa
  • Publication number: 20180265144
    Abstract: In an elastic crawler (10) and an elastic crawler drive mechanism (100), at least a portion of the outer edge of an engaging portion (12) has a cross-sectional arc shape such that both the trajectory drawn by the outer edge of the engaging portion (12) from when the engaging portion (12) starts to enter a tooth groove of a sprocket (20) until engagement between the engaging portion (12) and teeth (22) is complete and the trajectory drawn by the outer edge of the engaging portion (12) from when the engaging portion (12) starts to disengage from the teeth (22) until disengagement is complete do not project further outward than the outer edge of the engaging portion (12) when the engagement is complete.
    Type: Application
    Filed: February 12, 2016
    Publication date: September 20, 2018
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Takashi MIZUSAWA
  • Patent number: 10053169
    Abstract: A main cord layer is embedded in a crawler main body, and a first bias cord layer, a second bias cord layer, a third bias cord layer and a fourth bias cord layer are embedded at an outer peripheral side of the main cord layer. Bias cords of the second bias cord layer and bias cords of the third bias cord layer are inclined in a direction that is opposite, with respect to a crawler circumferential direction, bias cords of the fourth bias cord layer that are inclined with respect to the crawler circumferential direction.
    Type: Grant
    Filed: May 31, 2016
    Date of Patent: August 21, 2018
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Takashi Mizusawa
  • Publication number: 20180154959
    Abstract: A crawler includes crawler body formed by an elastic body shaped into an endless loop, a tensile body embedded in the crawler body and wound around a circumferential direction of the crawler body, guide projections formed at an inner circumferential surface of a width direction central portion of the crawler body and spaced apart in the circumferential direction of the crawler body, a flat face, upon which a rotating wheel provided at a vehicle rolls, forming an inner circumferential surface further toward a width direction outer side of the crawler body than the guide projections and an inclined face, upon which the rotating wheel rolls, inclined from an outer side end portion of the flat face in a crawler body width direction such that a thickness of the crawler body gradually increases toward the width direction outer side and circumferential inner side of the crawler body.
    Type: Application
    Filed: June 3, 2016
    Publication date: June 7, 2018
    Inventors: Shingo SUGIHARA, Kenji TATEISHI, Takashi MIZUSAWA
  • Publication number: 20180148113
    Abstract: A main cord layer is embedded in a crawler main body, and a first bias cord layer, a second bias cord layer, a third bias cord layer and a fourth bias cord layer are embedded at an outer peripheral side of the main cord layer. Bias cords of the second bias cord layer and bias cords of the third bias cord layer are inclined in a direction that is opposite, with respect to a crawler circumferential direction, bias cords of the fourth bias cord layer that are inclined with respect to the crawler circumferential direction.
    Type: Application
    Filed: May 31, 2016
    Publication date: May 31, 2018
    Inventor: Takashi MIZUSAWA
  • Publication number: 20180148110
    Abstract: A crawler includes a crawler main body (a rubber crawler main body (12)), a tensile body (70), guide protrusions (16), and flat surfaces (40). The tensile body (70) is provided with a flat portion (72) that is arranged along a width direction of the crawler main body and a slanting portion (74) that is slanted and arranged at a width direction outer side of the crawler main body relative to the flat portion (72). The guide protrusions (16) are formed at an inner peripheral face of the crawler main body at a width direction middle portion of the crawler main body. The flat surfaces (40) are formed at the width direction outer sides of the crawler main body relative to the guide protrusions (16). Turning wheels (a driving wheel (100), an idling wheel (102) and rolling wheels (104)) provided at a vehicle roll on the flat surfaces (40).
    Type: Application
    Filed: May 31, 2016
    Publication date: May 31, 2018
    Inventors: Takashi MIZUSAWA, Shingo SUGIHARA, Kenji TATEISHI
  • Publication number: 20180134333
    Abstract: The elastic crawler according to this disclosure is an elastic crawler comprising on an inner circumferential side a plurality of engaging portions (14) respectively engageable with a plurality of pin members (22) arranged at a spacing in a circumferential direction of a sprocket, wherein: the engaging portions (14) have a pressure receiving surface (14a) which receives the pin members (22), an outline shape in side view of the pressure receiving surface (14a) being formed by an envelope L1 drawn by an outer end of the pin members (22) when the sprocket rolls coaxially with a central axis of a virtual rotor with a rolling diameter D1 as defined in D1=(pitch of the engaging portions)×(number of pin members)/(?)×a, and 0.9?a<1, together with the virtual rotor on a plane.
    Type: Application
    Filed: April 14, 2016
    Publication date: May 17, 2018
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Takashi MIZUSAWA
  • Patent number: 9919752
    Abstract: An elastic crawler includes an endless elastic body; cores that each include a core body and a pair of protrusions; lugs, on the outer circumferential side of the elastic body, each disposed so as to avoid a crawler circumferential direction area corresponding to at least a portion of the core in the crawler circumferential direction; and grooves, on the crawler inner circumferential surface, each positioned outward in the crawler width direction from the pair of protrusions in a crawler circumferential direction area corresponding to the core, each of the grooves being recessed relative to crawler inner circumferential surface portions adjacent to the groove on both sides in the crawler circumferential direction.
    Type: Grant
    Filed: November 7, 2016
    Date of Patent: March 20, 2018
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Takashi Mizusawa
  • Publication number: 20170355406
    Abstract: A sprocket (10) is capable of engaging with engaging portions (22) on an elastic endless belt (21). On a tooth face (F) of a tooth (12) of the sprocket (10), a portion of a tooth base on at least one side of a center line (O1) of the tooth (12) is a tooth base surface (12b), and the tooth base surface (12b) is inclined relative to the center line (O1) of the tooth (12) at an angle (A1) in a range of 0° or greater to 7.5° or less so as to approach the center line (O1) of the tooth (12) towards a tooth tip surface (12d).
    Type: Application
    Filed: February 12, 2016
    Publication date: December 14, 2017
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Takashi MIZUSAWA
  • Patent number: D821452
    Type: Grant
    Filed: June 13, 2017
    Date of Patent: June 26, 2018
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Shoko Nagamoto, Takashi Mizusawa
  • Patent number: D821453
    Type: Grant
    Filed: June 13, 2017
    Date of Patent: June 26, 2018
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Shoko Nagamoto, Takashi Mizusawa