Patents by Inventor Tomohiro Aoyama

Tomohiro Aoyama 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).

  • Publication number: 20080265708
    Abstract: A commutator main body has a cylindrical insulating body, and a plurality of segments arranged in an outer circumference of the insulating body. A short-circuit member is arranged in an end in an axial direction of the insulating body. The short-circuit member has a plurality of first short-circuit pieces and a plurality of second short-circuit pieces. A tabular insulating portion covers first coupling portions of the first short-circuit pieces, and second coupling portions of the second short-circuit pieces. The insulating portion has a restriction recess, and the end in the axial direction has a restriction projection. The restriction projection is engaged with the restriction recess, whereby the movement of the short-circuit member in the circumferential direction with respect to the commutator main body is restricted. Accordingly, the assembly of the short-circuit member in the commutator main body is facilitated.
    Type: Application
    Filed: June 26, 2007
    Publication date: October 30, 2008
    Inventors: Tomohiro Aoyama, Yasuhide Ito, Toshio Yamamoto
  • Publication number: 20080203847
    Abstract: In a direct current electric motor, segment pieces of a commutator are generally planar and are arranged one after another in a circumferential direction about a rotational axis of the commutator. A slidably engaging surface of each segment piece, which is slidably engageable with a plurality of brushes of the motor, extends in a plane that is generally perpendicular to the rotational axis, and each segment piece includes a radially inner engaging portion at a radially inner end part of the segment piece. Each conductive line extends along a corresponding straight line and electrically interconnects between the radially inner engaging portions of corresponding two of the plurality of segment pieces to implement the same electric potential in the corresponding two of the plurality of segment pieces.
    Type: Application
    Filed: February 21, 2008
    Publication date: August 28, 2008
    Applicant: ASMO CO., LTD.
    Inventors: Yasuhide Ito, Tomohiro Aoyama
  • Publication number: 20080093947
    Abstract: A stator has four or more magnetic poles. A commutator has a plurality of segments arranged in the circumferential direction and a short-circuit conductor for short-circuiting predetermined segments from among these segments. Each segment has an angular width WS, and there is a gap of an angular width WU between the segments. A substantial angular width WB of each of an anode brush and a cathode brush satisfies (n?1)(WS+WU)+WU<WB<n(WS+WU)+WU, where n is an integer no less than two. A plurality of coils are each connected to the corresponding one of the segments in order to form n closed loops. The closed loops each pass through the corresponding segments and are electrically independent of each other.
    Type: Application
    Filed: October 19, 2007
    Publication date: April 24, 2008
    Applicant: ASMO CO., LTD.
    Inventors: Tomohiro Aoyama, Yasuhide Ito, Toshio Yamamoto
  • Publication number: 20080055029
    Abstract: Ferromagnetic bodies, the number of which is n (n is an integer greater than or equal to two), are secured to an inner circumferential surface of a cylindrical yoke. A first gap S1 is provided between ferromagnetic bodies that are adjacent to each other in the circumferential direction. Active magnetic poles, the number of which is m (m is an integer greater than or equal to two), apply magnetic fields to each ferromagnetic body from radially inside. As a result, each magnet has magnetic pole portions the number of which is m. A third gap is provided between each pair of the active magnetic poles that correspond to a common ferromagnetic body. The angular width of the third gap is set greater than a first angular width of the first gap. As a result, all magnetic pole centers are easily arranged at equal angular intervals.
    Type: Application
    Filed: September 4, 2007
    Publication date: March 6, 2008
    Inventors: Tomohiro Aoyama, Yasuhide Ito
  • Publication number: 20080024026
    Abstract: A motor includes an annular armature core, a cylindrical yoke, and a permanent magnet that is fixed to the yoke in such a manner as to face the armature core in the radial direction. A plate-like magnetism guiding portion is located between the armature core and the permanent magnet. The magnetism guiding portion is made of a soft magnetic material, and has a first surface facing the permanent magnet and a second surface facing the armature core. With respect to the axial direction of the motor, the length of the first surface is equal to that of the permanent magnet, and the length of the second surface is less than that of the first surface With respect to the axial direction of the motor, the length of the permanent magnet is greater than that of the armature core.
    Type: Application
    Filed: July 26, 2007
    Publication date: January 31, 2008
    Inventors: Tomohiro Aoyama, Yasuhide Ito
  • Publication number: 20060208605
    Abstract: Coils are provided on a plurality of tooth sections of a core. The coils are formed by successively winding a conductor on the tooth sections with at least one tooth section between each successive windings, such that each portion of the conductor extending between two tooth sections located with at least one tooth section therebetween forms a jumper wire extending in the circumferential direction of the core. A commutator has a plurality of claw portions projecting to the outside of the commutator. Each of the claw portions electrically connects one of a plurality of segments to one of the jumper wires. When the core and the commutator are attached to a rotary shaft, each claw portion is arranged at a position corresponding to one of the jumper wires as viewed in the axial direction of the rotary shaft.
    Type: Application
    Filed: January 23, 2006
    Publication date: September 21, 2006
    Inventors: Tomohiro Aoyama, Yasuhide Ito, Yoshiki Nakano
  • Patent number: 6589337
    Abstract: In a process of producing a SiC device, a Si layer is formed on the surface of a SiC substrate, and the Si layer is removed from the surface of the SiC substrate by supplying oxygen gas to the Si layer in a high ambient temperature and a low ambient pressure. The pressure is set at 1×10−2 to 1×10−6 Pa. Thus a cleaned surface of the SiC substrate, not contaminated by carbon and the like in atmospheric air, can be provided. Preferably, the oxygen pressure and temperature are set at about 10−6 Pa and 1000° C. for removing the Si layer. Thereafter, the oxygen is further supplied to raise the pressure to about 104 Pa to form an oxide film on the cleaned SiC substrate. Thus, the SiC substrate is cleaned and then formed with the oxide layer in the same chamber by changing the ambient pressure but without changing the ambient temperature.
    Type: Grant
    Filed: September 5, 2001
    Date of Patent: July 8, 2003
    Assignee: Denso Corporation
    Inventors: Yoshiyuki Hisada, Shinichi Mukainakano, Takeshi Hasegawa, Ayahiko Ichimiya, Tomohiro Aoyama, Kiyoshige Kato
  • Publication number: 20020033130
    Abstract: In a process of producing a SiC device, a Si layer is formed on the surface of a SiC substrate, and the Si layer is removed from the surface of the SiC substrate by supplying oxygen gas to the Si layer in a high ambient temperature and a low ambient pressure. The pressure is set at 1×10−2 to 1×10−6 Pa. Thus a cleaned surface of the SiC substrate, not contaminated by carbon and the like in atmospheric air, can be provided. Preferably, the oxygen pressure and temperature are set at about 10−6 Pa and 1000° C. for removing the Si layer. Thereafter, the oxygen is further supplied to raise the pressure to about 104 Pa to form an oxide film on the cleaned SiC substrate. Thus, the SiC substrate is cleaned and then formed with the oxide layer in the same chamber by changing the ambient pressure but without changing the ambient temperature.
    Type: Application
    Filed: September 5, 2001
    Publication date: March 21, 2002
    Inventors: Yoshiyuki Hisada, Shinichi Mukainakano, Takeshi Hasegawa, Ayahiko Ichimiya, Tomohiro Aoyama, Kiyoshige Kato
  • Patent number: 5714618
    Abstract: A polymer having a blocked terminal group according to the present invention, represented by the following Formula (I): ##STR1## where R is an alkylene group containing 1 to 20 carbon atoms; X.sub.1 is an acyl group containing 2 to 50 carbon atoms; Y is H, an alkyl group containing 1 to 50 carbon atoms or an alkenyl group containing 1 to 50 carbon atoms; m is a positive integer; and n.sub.1 is 0 or a positive integer.
    Type: Grant
    Filed: January 9, 1997
    Date of Patent: February 3, 1998
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Kunio Kimura, Takeshi Ito, Tomohiro Aoyama, Keiichi Uno, Kiyoshi Hotta, Minako Arichi
  • Patent number: 5618911
    Abstract: A polymer having a blocked terminal group according to the present invention, represented by the following Formula (I): ##STR1## where R is an alkylene group containing 1 to 20 carbon atoms; X.sub.1 is an acyl group containing 2 to 50 carbon atoms; Y is H, an alkyl group containing 1 to 50 carbon atoms or an alkenyl group containing 1 to 50 carbon atoms; m is a positive integer; and n.sub.1 is 0 or a positive integer.
    Type: Grant
    Filed: August 3, 1994
    Date of Patent: April 8, 1997
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Kunio Kimura, Takeshi Ito, Tomohiro Aoyama, Keiichi Uno, Kiyoshi Hotta, Minako Arichi