Patents by Inventor Isao Masuzawa
Isao Masuzawa 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).
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Patent number: 6019056Abstract: An anti-rolling apparatus according to the present invention includes rail members which are formed in straight form and disposed perpendicular to a rolling axis of an object whose rolling is to be reduced, a movable weight capable of reciprocating along the rail members, and two springs for generating a stability force for the movable weight, wherein the two springs are elongated or contracted alternately when the movable weight is reciprocated.Type: GrantFiled: October 23, 1997Date of Patent: February 1, 2000Assignee: Tokimec Inc.Inventors: Toru Maeda, Takeshi Hojo, Michio Fukano, Naoki Sakuraoka, Isao Masuzawa
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Patent number: 5781985Abstract: An acceleration detection gyro apparatus is of the electrostatic supporting type. This gyro apparatus call be made inexpensive, long in life, excellent in durability and can be applied to a wide variety of fields. A gyro rotor (20) is supported relative to a gyro case (21) by an electrostatic supporting force in a non-contact fashion and rotated about the spin axis along the Z axis by a rotor driving system. The gyro rotor (20) is disk-shaped and constructed by forming metal thin film electrodes on both surfaces of a plate member made of preferably an insulating material. The gyro apparatus includes a slave control system for slaving a displacement of the gyro rotor (20) relative to the gyro case (21) in the Z-axis direction (spin axis direction) and a central position control system for slaving a displacement of the gyro rotor (20) in the X-axis and Y-axon directions.Type: GrantFiled: April 10, 1995Date of Patent: July 21, 1998Assignee: Tokimec Inc.Inventors: Takafumi Nakaishi, Takeshi Hojo, Takao Murakoshi, Isao Masuzawa, Shigeru Nakamura, Kazuaki Tani
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Patent number: 5781296Abstract: A fiber optic gyro can overcome the defects encountered with conventional fiber optic gyros of phase-modulation method, closed-loop system with serrodyne modulation and digital modulation. A reference phase difference .DELTA..beta. and a ramp phase difference .sigma. are generated in an interference light intensity signal I by use of a triangular waveform, i.e., delta serrodyne waveform signal. The reference phase difference .DELTA..beta. is changed to constant values .DELTA..beta..sub.A and .DELTA..beta..sub.B whose absolute values are the same and whose signs are different at every times T.sub.A and T.sub.B. A phase x of the interference light intensity signal I becomes equal to x=.DELTA..theta.+.sigma.+.DELTA..beta.. The ramp phase difference .sigma. is controlled so as to satisfy .DELTA..theta.+.sigma.=0. Accordingly, at the stable point of the control loop, a Sagnac phase difference .DELTA..theta. is equal to the ramp phase difference .sigma..Type: GrantFiled: July 23, 1996Date of Patent: July 14, 1998Assignee: Tokimec Inc.Inventors: Kanshi Yamamoto, Shinichi Kawada, Takeshi Hojo, Yoshiyuki Okada, Isao Masuzawa
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Patent number: 5719335Abstract: An acceleration detection gyro apparatus is of the electrostatic supporting type. This gyro apparatus can be made inexpensive, long in life, excellent in durability and can be applied to a wide variety of fields. A gyro rotor (20) is supported relative to a gyro case (21) by an electrostatic supporting force in a non-contact fashion and rotated about the spin axis along the Z axis by a rotor driving system. The gyro rotor (20) is disk-shaped and constructed by forming metal thin film electrodes on both surfaces of a plate member made of preferably an insulating material. The gyro apparatus includes a slave control system for slaving a displacement of the gyro rotor (20) relative to the gyro case (21) in the Z-axis direction (spin axis direction) and a central position control system for slaving a displacement of the gyro rotor (20) in the X-axis and Y-axis directions.Type: GrantFiled: April 16, 1996Date of Patent: February 17, 1998Assignee: Tokimec Inc.Inventors: Takafumi Nakaishi, Takeshi Hojo, Takao Murakoshi, Isao Masuzawa, Shigeru Nakamura, Kazuaki Tani
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Patent number: 4855739Abstract: A marine autopilot apparatus having a microcomputer for controlling a rudder control loop formed of at least a rudder servo amplifier, and a power unit, for detecting an abnormality concerning the steering of a rudder and for indicating an alarm concerning the detected abnormality and the like. A representing alarm indicator lamp classifying the abnormalities into a single or plurality of groups and for collectively indicating the abnormalities in the form of the single or plurality of groups. A general-purpose indicator for indicating various data at least concerning the steering, set values and respective contents of the abnormalities detected and a rudder control collective alarm circuit for indicating the occurrence of the abnormality in the rudder control loop. The rudder control collective alarm circuit is driven when at least one of a plurality of alarm points within the rudder control loop, and the power unit exhibits an abnormal condition.Type: GrantFiled: July 17, 1987Date of Patent: August 8, 1989Assignee: Tokyo Keike Co., Ltd.Inventors: Toshio Miyayama, Isao Masuzawa, Nakayasu Hirono
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Patent number: 4811679Abstract: A marine automatic steering apparatus for setting a desired course in a digital fashion is disclosed, in which a course deviation which is a difference between a set course and a ship's heading is indicated in an analog manner on a course deviation indicator whose zero point is set at the position corresponding to the lubber line of a steering repeater card.Type: GrantFiled: August 27, 1986Date of Patent: March 14, 1989Assignee: Kabushiki Kaisha Tokyo KeikiInventors: Isao Masuzawa, Toshio Miyayama, Mitsuo Nakayama, Koichi Nishimura
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Patent number: 4766834Abstract: A marine automatic steering apparatus in which a part or whole of its control circuit is doubled as dual steering control sections same in construction includes a non-volatile memory controlled by either of the dual steering control sections and in and from which data can be written and read out.Type: GrantFiled: February 9, 1987Date of Patent: August 30, 1988Assignee: Kabushiki Kaisha Tokyo KeikiInventors: Toshio Miyayama, Isao Masuzawa, Kanshi Yamamoto, Mitsuo Watanabe, Hidemitsu Yamada
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Patent number: 4763072Abstract: A magnetic sensor including an annular iron core, an annular hollow bobbin for a primary winding which incorporates therein the annular iron core, the bobbin having a plurality of protruded portions which are arranged along a circumference of the annular bobbin with an equal distance, each of the protruded portions being extended in a direction parallel to a center axis of the annular iron core, the primary winding being wound on the annular bobbin at respective portions between adjacent protruded portions with an equal number of turns, a bobbin for a secondary winding having a positioning means for the primary winding in association with the protruded portions of the bobbin for the primary winding when the bobbins for the primary and secondary windings are assembled, the secondary winding being wound on the bobbin to form more than two pairs of winding groups.Type: GrantFiled: May 30, 1986Date of Patent: August 9, 1988Assignee: Kabushikikaisha Tokyo KeikiInventors: Mitsuru Katoh, Shin-Ichi Kawada, Isao Masuzawa
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Patent number: 4336594Abstract: The present invention relates to an automatic steering apparatus for ships which prevents the occurrence of directional instability due to unusual phenomena which occur at small rudder angles of so-called full-bodied ships.When the rudder angle of such ship is small, two stable steady turning conditions occur so that the turning movement cannot assume any single state and it results in a frequent and irregular unstable ship motion.Type: GrantFiled: August 28, 1979Date of Patent: June 22, 1982Assignee: Tokyo Keiki Co., Ltd.Inventors: Isao Masuzawa, Kanshi Yamamoto, Yoichi Hirokawa
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Patent number: 3949696Abstract: A marine steering arrangement wherein each of the starboard steering switch and port steering switch connected to a power source is closed upon receipt of an actuating signal resulting from a difference between an order signal of a rudder angle and an actual signal of a rudder angle, so as to conduct power to a rudder driving mechanism, rotating the rudder to the order rudder angle position within an allowable extent of the rudder angle, is provided with an improvement which further comprises at least one limit switch for shutting off the power source to stop any further rotation of the rudder beyond either of the rudder angle limits.Type: GrantFiled: September 23, 1974Date of Patent: April 13, 1976Assignee: Tokyo Keiki Company LimitedInventors: Kazutoshi Onishi, Tsuneo Awano, Isao Masuzawa