Patents Assigned to Aisin Seiki Company, Limited
  • Patent number: 4454553
    Abstract: A current detector comprising a current-pulse duty conversion element including a core of an amorphous, magnetically soft material having a first and a second coil disposed thereon. A current which is to be determined is passed through the first coil while the current flowing through the second coil is detected. A pulse of a given frequency is applied to one end of the second coil while the other end of the second coil is connected with an element which converts the current flowing through the second coil into a corresponding voltage. A voltage developed across the element is integrated and then converted into an analog voltage. The duty ratio of the voltage pulse appearing across the element which is connected to the other end of the second coil changes in accordance with the value of current passing through the first coil, whereby the analog voltage shifts.
    Type: Grant
    Filed: March 29, 1982
    Date of Patent: June 12, 1984
    Assignee: Aisin Seiki Company, Limited
    Inventor: Shinichiro Iwasaki
  • Patent number: 4425760
    Abstract: A brake booster for an automobile which includes a reaction disc plate disposed within a central bore of a power piston, one surface of the reaction disc plate contacting the cylindrical member and an opposite side surface contacting force transmitting means wherein one side surface of the reaction disc plate includes a rounded surface complementary to a rounded surface provided on the cylindrical member. A combined cylindrical member and reaction disc plate are utilized such that no space or gap is formed between the cylindrical member and reaction plate so as to shorten the length of the cylindrical member and decrease the time necessary for initiation of brake operation of the brake booster.
    Type: Grant
    Filed: November 13, 1980
    Date of Patent: January 17, 1984
    Assignee: Aisin Seiki Company, Limited
    Inventor: Yoichi Furuta
  • Patent number: 4403515
    Abstract: A position sensor for detecting a displacement of an object, comprising a movable member coupled to the object, a permanent magnet connected to the movable member, and a magnetically soft member surrounded by an electrical coil secured adjacent to a range of movement of the magnet. Voltage pulses are applied to one end of the electrical coil, the other end of which is connected in series with the resistor. For each pulse applied to the coil, a voltage drop across the resistor is detected and a time lag between the leading edge of the applied pulse and the corresponding voltage drop across the resistor is measured by a processing circuit which produces an analog voltage or a digital code indicative of the time lag. A displacement of the object produces a change in magnetic field at the magnetically soft member which results in a corresponding variation in the above-noted time lag, which is therefore indicative of the displacement of the object.
    Type: Grant
    Filed: April 26, 1982
    Date of Patent: September 13, 1983
    Assignee: Aisin Seiki Company, Limited
    Inventor: Shinichiro Iwasaki
  • Patent number: 4398419
    Abstract: A rotational angle sensor arrangement includes a casing, a rotary center shaft rotatably supported by the casing, a permanent magnetic secured to the casing, and at least one magnetically soft member carrying an electrical winding thereon firmly disposed in the casing. A ferromagnetic member is attached to the rotary shaft, and is capable of angular displacement above the upper ends of the permanent magnet and the magnetically soft member without making contact with the same. The angular displacement of the ferromagnetic material member causes corresponding changes in the magnetic flux provided by the permanent magnet acting on the magnetically soft member which are detected. The magnetically soft member is preferably formed from an amorphous magnetic material. Various embodiments of the rotational angle sensor device are disclosed.
    Type: Grant
    Filed: April 26, 1982
    Date of Patent: August 16, 1983
    Assignee: Aisin Seiki Company, Limited
    Inventor: Shinichiro Iwasaki
  • Patent number: 4389864
    Abstract: A key holder which includes a body and a key pivotably mounted on the body and movable between an operating position in which the key is disposed outside of the body and a non-operating position in which the key is housed within the body. The key holder may also include a biasing member for maintaining the key at the operating position thereof or the non-operating position thereof and the key may include a stopper member disposed thereon which is engageable with the body to maintain the key at the non-operating position thereof.
    Type: Grant
    Filed: December 5, 1980
    Date of Patent: June 28, 1983
    Assignee: Aisin Seiki Company, Limited
    Inventor: Minoru Toyoda
  • Patent number: 4389581
    Abstract: A pulse duty control system includes a pulse duty controlling element which is formed by a core of an amorphous magnetically soft material and which carries a first and a second coil thereon. A first set of pulses are applied to one end of the first coil while a constant voltage or a second set of pulses are applied to one end of the second coil. The other end of the first coil is connected to an output terminal while the other end of the second coil is connected to a current controlling transistor. An output pulse which is developed at the other end of the first coil has a rising edge which lags behind the rising edge of the first set of pulses by a time delay which corresponds to the degree of conduction of the transistor, and has a falling edge which is substantially synchronized with that of the first set of pulses.
    Type: Grant
    Filed: August 29, 1980
    Date of Patent: June 21, 1983
    Assignee: Aisin Seiki Company, Limited
    Inventor: Shinichiro Iwasaki
  • Patent number: 4385682
    Abstract: Improved clutch facings for use in motor vehicles containing asbestos fibers, an improved friction property modifier comprising a cashew nutshell resin dust having graphite powder integrally incorporated therein, and a binder.
    Type: Grant
    Filed: October 27, 1980
    Date of Patent: May 31, 1983
    Assignees: Aisin Seiki Company, Limited, Aisin Kako Kabushiki Kaisha
    Inventors: Yasunobu Yamamoto, Toshiaki Sakabe, Eiji Hamada
  • Patent number: 4380928
    Abstract: A rotational angle sensor device includes a casing, a movable body rotatably supported on the casing, a permanent magnet secured to the movable body, a magnetically soft member adjacent to the permanent magnet, and an electrical coil wound on the magnetically soft member. The movable body is responsive to a rotational angle or angular displacement caused by an external object, in response to which the permanent magnet moves in relation to the magnetically soft member, causing variations in the external flux. Those variations in external flux cause corresponding variations in the time interval from the instant at which a voltage is applied to the electrical coil to the instant at which the coil current reaches a certain level. The variations in the time interval are detected to determine the rotational angle caused by the external object. The magnetically soft member is preferably formed from an amorphous magnetically soft material. Various embodiments of the rotational angle sensor device are disclosed.
    Type: Grant
    Filed: April 21, 1982
    Date of Patent: April 26, 1983
    Assignee: Aisin Seiki Company, Limited
    Inventor: Shinichiro Iwasaki
  • Patent number: 4371272
    Abstract: A thermodetector including a ferromagnetic sensor placed on an object to be measured having a magnetic permeability which changes in relation to the temperature, and made of a ferrite material having a measurable change of magnetic permeability in a measuring temperature range. A magnetic flux generator is disposed to apply a magnetic field to the ferromagnetic member and may be a permanent magnet. A magnetically soft member made of a laminated core of thin sheets of amorphous magnetic material is placed within the magnetic field of the magnetic field generator to cooperate with at least the magnetic flux generator to form a magnetic path. An electric coil including a bobbin surrounds the magnetically soft member. The change of magnetic permeability alters the magnetic flux in the magnetically soft member and is sensed by the electric coil to give an indication of temperature.
    Type: Grant
    Filed: August 29, 1980
    Date of Patent: February 1, 1983
    Assignee: Aisin Seiki Company, Limited
    Inventor: Shinichiro Iwasaki
  • Patent number: 4365513
    Abstract: A deceleration sensor comprising a magnetically soft core having an electrical coil wound thereon, a permanent magnet, a spring, and a ferromagnetic member adapted to be displaced against the action of the spring in response to deceleration to thereby change the magnetic flux acting on the magnetically soft core. A pulse voltage is applied to one end of the electrical coil and a corresponding voltage drop develops across a resistor connected to the other end of the coil with a delay corresponding to a deceleration. This delay may be represented in the form of an analog voltage or digital code.
    Type: Grant
    Filed: August 29, 1980
    Date of Patent: December 28, 1982
    Assignee: Aisin Seiki Company, Limited
    Inventor: Shinichiro Iwasaki
  • Patent number: 4361045
    Abstract: A vibration sensor comprised of a movable body, a permanent magnet coupled to the movable body, and a displacement pulse phase conversion unit including a magnetically soft member carrying an electrical coil thereon and fixedly disposed in the vicinity of the course of movement of the permanent magnet. A pulse voltage is applied to one end of the electrical coil. A voltage drop occurs across a resistor which is connected in series with the other end of the electrical coil. A time lag of the voltage drop with respect to the pulse voltage, representing a vibrational amplitude, is provided in the form of an analog voltage.
    Type: Grant
    Filed: August 29, 1980
    Date of Patent: November 30, 1982
    Assignee: Aisin Seiki Company, Limited
    Inventor: Shinichiro Iwasaki
  • Patent number: 4357114
    Abstract: A temperature sensor includes a permanent magnet placed on an object whose temperature is to be measured, a magnetically soft member located within the magnetic field of the magnet and an electrical coil placed around the magnetically soft member. The electrical coil is supplied with voltage pulses at one end while the other end is connected to a resistor in series to detect a voltage drop. The time lag of the voltage drop with respect to the voltage pulse is represented by an analog voltage or a digital code. A change in temperature changes the field strength of the magnet and hence the flux in the magnetically soft member. The coil senses the change in flux as a change in the time lag and thus measures the temperature.
    Type: Grant
    Filed: August 29, 1980
    Date of Patent: November 2, 1982
    Assignee: Aisin Seiki Company, Limited
    Inventor: Shinichiro Iwasaki
  • Patent number: 4356438
    Abstract: A motor speed control system utilizing a pulse duty controlling element including a core of an amorphous, magnetically soft material having a first and a second coil disposed thereon. A first set of pulses are applied to one end of the first coil while a constant voltage or a second set of pulses are applied to one end of the second coil. A duty controlled pulse is outputted from the other end of the first coil for supply to an electric motor. The other end of the second coil is connected to a current level controlling transistor, the base of which is connected to speed presetting means. The output pulse appearing at the other end of the first coil has a rising edge which lags behind the rising edge of a pulse in the first set of pulses by a time delay which depends on the degree of conduction of the transistor which is in turn determined by a preset value of the speed presetting means, and has a falling edge which is substantially synchronized with the falling edge of the pulse in the first set.
    Type: Grant
    Filed: August 29, 1980
    Date of Patent: October 26, 1982
    Assignee: Aisin Seiki Company Limited
    Inventor: Shinichiro Iwasaki
  • Patent number: 4354368
    Abstract: A key holder which includes a body and a key pivotably mounted on the body and movable between an operating position in which the key is disposed outside of the body and a non-operating position in which the key is housed within the body. The key holder may also include a biasing member for maintaining the key at the operating position thereof or the non-operating position thereof and the key may include a stopper member disposed thereon which is engageable with the body to maintain the key at the non-operating position thereof.
    Type: Grant
    Filed: December 5, 1980
    Date of Patent: October 19, 1982
    Assignee: Aisin Seiki Company, Limited
    Inventor: Minoru Toyoda
  • Patent number: 4351191
    Abstract: A pressure sensor comprising a pressure-displacement transducer mechanism including a movable body driven by a hydraulic pressure to be determined and spring means for urging the movable body in a direction opposite to the pressure, and a displacement-pulse phase conversion unit including a ferromagnetic member secured to the movable body, a magnetically soft member carrying an electrical coil thereon and disposed at a stationary point adjacent to the region of movement of the ferromagnetic member and a permanent magnet. A pulse voltage is applied to one end of the electrical coil, the other end of which is connected in series with a resistor. A voltage drop across the resistor is detected, and a time lag of the voltage drop with respect to the pulse voltage, representing a displacement of the ferromagnetic member in response to a change in the hydraulic pressure, is determined and provided in the form of an analog voltage or a digital code.
    Type: Grant
    Filed: August 29, 1980
    Date of Patent: September 28, 1982
    Assignee: Aisin Seiki Company, Limited
    Inventor: Shinichiro Iwasaki
  • Patent number: 4349093
    Abstract: A clutch facing includes an annular reinforcing plate made of metal material, a friction lining bonded on the outer side of the annular reinforcing plate, and another lining bonded on the inner side of the annular reinforcing plate. The annular reinforcing plate is secured to a clutch driven plate assembly by a plurality of rivets. The head portions of the rivets are entirely received in the extruded pocket portions of the annular reinforcing plate, so that the clutch facing will be useful until the friction lining is worn off. Another lining is made of suitable material having a lower comparative cost than the friction lining. An additional lining prevents the annular reinforcing plate from corrosion and prevents the friction lining from experiencing a pressure difference on the friction surface of the friction lining.
    Type: Grant
    Filed: January 17, 1979
    Date of Patent: September 14, 1982
    Assignee: Aisin Seiki Company, Limited
    Inventor: Hisami Tsujio
  • Patent number: 4344331
    Abstract: A fluid flow meter comprised of a body portion having a passage therein for the fluid to flow therethrough, a movable member provided in the passage and adapted to be tiltable to open or close throttling of the passage corresponding to the flow rate of the fluid flowing through the passage, a spiral spring biasing the movable member constantly in the direction of throttling the passage, an amorphous magnetic member fixed to the movable member and provided with coils wound thereon, and a solenoid wound on the body portion to generate magnetic flux that is substantially parallel to the direction of fluid flow.
    Type: Grant
    Filed: August 29, 1980
    Date of Patent: August 17, 1982
    Assignee: Aisin Seiki Company, Limited
    Inventor: Shinichiro Iwasaki
  • Patent number: 4336657
    Abstract: A position sensor comprising a movable member functionally connected with an operative device and moving in response to a positional displacement of the operative device, a displacement-pulse phase conversion unit including a magnetically soft amorphous metal member undergoing stress variations produced by the displacement of the movable member and an electrical coil wound on the magnetically soft amorphous metal member. A pulse voltage is applied to one end of the electrical coil, the other end of which is connected in series with a resistor. A voltage across the resistor is detected, and a time lag of the resistor voltage with respect to the pulse voltage, representing a measure of displacement, is provided in the form of an analog voltage or a digital code.
    Type: Grant
    Filed: August 29, 1980
    Date of Patent: June 29, 1982
    Assignee: Aisin Seiki Company, Limited
    Inventor: Shinichiro Iwasaki
  • Patent number: 4325243
    Abstract: A key holder which includes a body and a key pivotably mounted on the body and movable between an operating position in which the key is disposed outside of the body and a non-operating position in which the key is housed within the body. The key holder may also include a biasing member for maintaining the key at the operating position thereof or the non-operating position thereof and the key may include a stopper member disposed thereon which is engageable with the body to maintain the key at the non-operating position thereof.
    Type: Grant
    Filed: August 22, 1979
    Date of Patent: April 20, 1982
    Assignee: Aisin Seiki Company, Limited
    Inventor: Minoru Toyoda
  • Patent number: 4324137
    Abstract: A temperature sensor including a casing and a core within the casing, where the core includes a bimetallic strip and a magnetically soft amorphous material secured to the strip. A change in temperature causes a deflection in the strip and hence a stress change in the magnetically soft amorphous material. An electrical coil is disposed about the core to convert the stress change in the magnetically soft amorphous member into an electrical signal.
    Type: Grant
    Filed: August 29, 1980
    Date of Patent: April 13, 1982
    Assignee: Aisin Seiki Company, Limited
    Inventor: Shinichiro Iwasaki