Matsushita Electric Industrial Co., Ltd.

Masaharu Ushihara

Jiro Terada

Masami Tamura

Nobuharu Katsuki

Hiroshi Takenaka

Toshihiko Ichinose

Kiyotaka Uehira

Toshiya Nakagaki

Kouji Oike

Koji Oike

Hitoshi Nishimura

Kikuo Kaino

Takeshi Uemura

Susumu Maruno

Junichi Yukawa

Hideo Ohkoshi

Yoshikazu Tsuru

Masaaki Takita

Hiroshi Senda

Masakazu Hatanaka

Taichi Itoh

Masami Nakagawa

Noboru Miyaji

Hiroaki Mouri

Masayoshi Murakami

Michinori Nagahiro

Sumitake Yoshida

Humio Yamazaki

Masumi Tanaka

The rotation angle-detecting device has a main rotator and two detecting rotators that rotate as the main rotator rotates. Each of the two detecting rotators has a magnet and a magnetic detector. As the detecting rotator rotates, a change occurs in magnetic lines of force from the magnet. From the change, the magnetic detector detects rotation of the detecting rotator. According to the rotation detected, the device determines the rotation angle of the main rotator. In addition, a ring-shaped ferromagnetic body is disposed around the magnet or the magnetic detector of the detecting rotator. The structure described above enables magnetic detection without disturbance in each magnetic field of the magnets, and even in a downsized structure, the device can detect the rotation angle with high accuracy.

Rotation angle-detecting device

A detector of an absolute rotation angle and torque includes a first gear coupled to an input shaft of a torsion-bar unit, a gear A engaging with the first gear, and a first detecting section of an absolute rotation angle placed at the center of the gear A. The detector also includes a second gear coupled to an output shaft of the torsion-bar unit, a gear B engaging with the second gear, and a second detecting section of an absolute angle placed at the center of gear B.

Device for detecting absolute rotation angle and torque

A detector of a rotation angle and torque is disclosed. First gear () and second gear () are coupled to input shaft () and output shaft () of a torsion-bar unit respectively. First magnet () magnetized in a radius direction is rigidly mounted to first rotor () engaging with first gear (). Second magnet () magnetized in a radius direction is rigidly mounted to second rotor () engaging with second gear (). Circuit board () is placed between first rotor () and second rotor (). Circuit board () includes first magnetism detecting element () on its first face confronting the first magnet (), and also includes second magnetism detecting element () on its second face confronting the second magnet ().

Device for detecting rotation angle and torque

An inclination sensor having excellent rotational performance, longlasting stability and high sensing precision. The inclination sensor comprises a pendulum ( ) rotatably attached to a case ( ) of a fixed body secured to an attached member, a magnetic flux-generating means ( ) attached to the pendulum ( ), reed switches ( ) and ( ) attached to part of the case ( ) corresponding to the locus along which the magnetic flux-generating means ( ) moves, and a flange portion ( ) which is a damping body being nonmagnetic and electrically conductive and disposed in the case ( ) along the locus of the movement of the magnetic flux-generating means ( ).

Inclination sensor

The pendulum assembly comprises a permanent magnet disposed in the vicinity of a pendulum, a U-shaped yoke by which most of the magnetic flux of the permanent magnet is gathered and passes through, and a rotation shaft. The direction of axis of the rotation shaft is parallel to the direction of magnetic poles of the permanent magnet. Eddy current brakes are inserted into the spaces between one of the magnetic poles of the permanent magnet and one of the ends of the yoke, and between the other magnetic pole the magnet and the other end of the yoke. This construction achieves a more compact and shorter tilt sensor which is resistant to disturbances such as geomagnetism and other magnetic fields and vibrations.

Tilt sensor

The present invention aims at providing an inclination angle sensor that can be mounted on a vehicle such as an automobile, resistant to external disturbances such as vibrations, superior in rotational performance, and small in size. In order to achieve the object, an inclination angle sensor of the present invention includes: a non-magnetic and electrically conductive weight ( ); a rotary shaft ( ) fixed to the weight ( ); a bearing ( ) for rotatably supporting the rotary shaft ( ); a frame ( ) for securing the bearing ( ); one or two combinations of reflection type photo-interrupter ( ) consisting of a light-receiving element ( ) and a light-emitting element ( ) for varying signal in response to a movement of the weight ( ); a flange part ( ) provided to outstretch from an outer perimeter of the weight in parallel to or in a manner to form a predetermined angle with the rotary shaft ( ); and a magnet ( ) fixed to the frame ( ) in a manner produce magnetic flux primarily toward the flange part ( ).

Inclination angle sensor

Angular velocity sensor

A high-performance angular velocity sensor has a tuning-fork structure in which two vibrator units consisting of piezoelectric elements are coupled to each other. The angular velocity sensor comprises two metal plates, a first vibrator including a first actuator and a first detector joined orthogonally to each other, and a second vibrator including a second actuator and a second detector joined orthogonally to each other, the two vibrators being coupled by an electrode block to each other in parallel along an axis of detection. The first actuator and the first detector include piezoelectric elements bonded to the first metal surface, and the second actuator and the second detector include piezoelectric elements bonded to the second metal surface.

Angular velocity sensor having a balanced tuning fork structure

In an angular velocity sensor device, a vibration isolation member, a sensor support plate on which a tuning fork unit functioning as a vibrating type angular velocity sensor is mounted, a collar, a circuit board on which a circuit pattern is formed for driving the tuning fork unit and processing a signal output therefrom are provided by having a plurality of pins inserted, in this order, which extend from the bottom surface of a concave-shaped case. The circuit pattern and the tuning fork unit are connected with each other via a flexible printed circuit board. These components are accommodated inside the concave-shaped case. A cover is fitted in an open top of the case so as to completely seal the case. The angular velocity sensor device with the aforementioned arrangement does not suffer variation in the operational properties due to disturbance vibration and deterioration in the vibration isolation property. In addition, adverse effects of moisture and corrosive gas in the atmosphere on the operational properties are prevented, since air is prevented from entering the inside of the case.

Angular velocity sensor device

The present invention relates to an angular velocity sensor utilized as a gyroscope and particularly, to a high-performance angular velocity sensor having a tuning-fork construction. The vibrator is formed of a metal base plate which is bent about 90 degrees along a center line defined by two opposite slits extending from their respective side edges to a central region of the metal base plate so that its two bent parts are orthogonal to each other. Two piezoelectric elements are bonded to the corresponding surfaces of the two parts of each vibrator which in turn serve as an actuator and a detector.

Angular velocity sensor having a tuning fork construction and its method

An angular velocity sensor having a tuning-fork structure comprising a first vibrator including a first actuator and a first detector each attached to a metal plate and joined orthogonally to each other, and a second vibrator including a second actuator and a second detector each attached to another metal plate and joined orthogonally to each other, the two vibrators being coupled by an electrode block to each other in a generally parallel relationship along the axis of detection of the sensor. The first and second detectors have a rectangular plate shape each holding a piezoelectric element. The rectangular plate shape has a lengthwise edge and a widthwise edge where the lengthwise edge parallel to the axis of detection of the sensor and is longer than the width wise edge. At least one of the lengthwise edges of the detectors has a beveled surface formed by removing metal at an angle from the lengthwise edge of the detector to balance the sensor.

Angular velocity sensor having a balanced tuning fork structure and the

The present invention relates to a ribbon feed mechanism for use in a heat transfer printer. The ribbon feed mechanism includes first, second, and third ribbon feed components fitted on a shaft, a friction plate mounted between the first and second ribbon feed components, a spring mounted between the second and third ribbon feed components, a cylinder which is in contact with the third ribbon feed component at one end thereof, and a ribbon feed presser for pressing the other end of the cylinder toward the third ribbon feed component. The rotational torque is always kept constant, and therefore no unmatching of colors occurs when the mechanism is applied to a printer.

Ribbon feed mechanism

A plurality of magnetic styli are arranged in a row for effecting a line recording. A magnetic styli are magnetized by a magnet held in contact with these styli so that a magnetic fluid attaching to the styli is protruded from each stylus to form continuous wave-like protrusions along the row of the styli. The magnetic fluid protruded from the styli is to fly or migrate as a high voltage is applied selectively between the styli and a control electrode which opposes to the styli across the recording paper, due to a Coulomb force acting on the ends of the protrusions. In consequence, a recording is made by the magnetic fluid serving as an ink on the recording paper in accordance with a recording signal. A predetermined head or height differential is preserved between the magnet and an ink tank. The magnet and the ink tank are connected to each other by means of a pipe filled with the magnetic fluid. A slight gap is formed in the connection between the pipe and the magnet. This gap, however, is completely covered and closed by the magnetic fluid attaching to the magnet so that the ambient air is prevented from coming into the pipe. A vacuum is generated in the pipe due to the aforementioned height differential to control the amount of the magnetic fluid supplied to the magnet. As the magnetic fluid is consumed progressively at the ends of the protrusions, the magnetic fluid is supplied to the protrusions from the ink tank through the pipe and the gap. In consequence, various troubles such as printing failure due to magnetic thickening of the magnetic fluid which inevitably takes place in the conventional apparatus incorporating an elongated magnet type ink supplying device, is completely eliminated to ensure a stable printing of a high quality.

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Hirakata, Japan

Masaharu Ushihara