Abstract: A rotation detector which can improve the manufacturing efficiency of a rotating machine. The rotation detector is provided with a connecting part which is fastened in contact with a rotating part of the power part, an output shaft which extends from the connecting part to one side in the axial direction, and a moving part which is comprised of a connecting part and output shaft and, further, has a detected region which is formed at a maximum outer circumferential surface of the connecting part and output shaft, and a fixed part which is fastened to the connecting part at the outside in the radial direction and which detects a change in magnetic field which is generated along with rotation of the detected region.

Abstract: A rotation detector which can improve the manufacturing efficiency of a rotating machine. The rotation detector is provided with a connecting part which is fastened in contact with a rotating part of the power part, an output shaft which extends from the connecting part to one side in the axial direction, and a moving part which is comprised of a connecting part and output shaft and, further, has a detected region which is formed at a maximum outer circumferential surface of the connecting part and output shaft, and a fixed part which is fastened to the connecting part at the outside in the radial direction and which detects a change in magnetic field which is generated along with rotation of the detected region.

Abstract: A magnetic encoder including an object to be detected, a casing opposite to the object, a magnet and a magnetic sensor accommodated in the casing is provided. The casing of the magnetic encoder has an opposite wall opposite to the object. The opposite wall has a thickened portion and a thin portion integrally formed with the thickened portion. The thin portion has a smaller thickness than the thickened portion. The magnetic sensor is situated at the thin portion.

Abstract: An Oldham coupling includes a first coupling part, a second coupling part and an intermediate part. The first coupling part and the second coupling part are coupled to each other with the intermediate part provided therebetween. The first coupling part and the second coupling part are fitted on fitting portions of the intermediate part extending perpendicular to each other. The first coupling part, the second coupling part and the intermediate part have fitting indication portions. The fitting indication portions allow a positional relationship between the first coupling part and the second coupling part about a rotational axis to be determined.

Abstract: An Oldham coupling includes a first coupling part, a second coupling part and an intermediate part. The first coupling part and the second coupling part are coupled to each other with the intermediate part provided therebetween. The first coupling part and the second coupling part are fitted on fitting portions of the intermediate part extending perpendicular to each other. The first coupling part, the second coupling part and the intermediate part have fitting indication portions. The fitting indication portions allow a positional relationship between the first coupling part and the second coupling part about a rotational axis to be determined.

Abstract: An excitation phase detecting capacitance-type position transducer comprises a stationary part having a plurality of excitation electrode groups and a movable part having a plurality of coupling electrodes. The capacitance-type position transducer detects a signal of which phase varies according to the relative positions of the movable part with respect to the stationary par and calculates an intra-period phase angle ? from two excitation signals having a phase difference of 90° captured at a zero-cross point of the detection signal.

Abstract: A capacitance-type encoder comprising a stator, a movable element, an excitation device and a signal processing device to obtain position data with low power-consumption. The stator has excitation-electrode sets electrically independent and displaced to have phase differences from each other to form a predetermined number of excitation-electrode groups. The movable element has connection electrodes having the same number as the excitation-electrode groups. The excitation device simultaneously applies a first pair of positive and negative pulse voltages respectively to two of the excitation-electrode sets having a phase difference of 180 degrees, and then simultaneously applies a second set of positive and negative pulse voltages respectively to the rest of the excitation-electrode sets.

Abstract: A capacitance-type encoder capable of obtaining position data of a movable element with low power-consumption. The capacitance-type encoder comprises a stator, a movable element arranged to confront the stator, an excitation device and a signal processing device. The stator has at least three excitation-electrode sets electrically independent from each other, each set constituted of excitation electrodes arranged cyclically and electrically connected with each other so that a predetermined number of excitation-electrode groups are formed. The movable element has connection electrodes having the same number as the excitation-electrode groups. The excitation device applies excitation signals to the excitation-electrode sets periodically in a predetermined sequence.

Abstract: A parallel-link operational device in which links of a link mechanism connecting rotary actuators and a movable member do not protrude outside an area of a base. Six flat rotary actuators driven to control position and posture of the movable member are provided on the base, rotary output shafts of which are disposed radially pointing toward the center of the base. The links fixedly mounted on the rotary output shafts of the actuators are connected by joints to one end of rods, and the other end of the rods are connected to the movable member by joints. An end effector mounted on the movable member is rotated by an actuator for posture control mounted on the base via a rotational-force transmission mechanism composed of joints, spline couplings, etc. The links rotate in planes parallel to the sides of the base without protruding beyond the area covered by the base.

Abstract: A film-like electrode member, used as a stationary member or a movable member of an electrostatic motor. The film-like electrode member is provided with an insulating substrate including a major surface and a back surface opposite to the major surface; a plurality of electrodes arranged along the major surface of the insulating substrate at predetermined intervals; a main section including at least a part of the plural electrodes and of the insulating substrate carrying the electrodes; a locally thick section integrally joined to the main section and having a thickness larger than the main section; and a conducting element formed on the thick section and connected to the plurality of electrodes. The thick section includes a protrusion element having insulating properties and locally protruding from the major surface of the insulating substrate; and the conducting element is formed continuously on the insulating substrate and the protrusion element.

Abstract: An electrostatic motor provided with a stationary member including a first major surface and a first back surface opposite to the first major surface; and a movable member including a second major surface and a second back surface opposite to the second major surface, the movable member being arranged to be movable relative to the stationary member in a condition where the second major surface is opposed to the first major surface of the stationary member. The electrostatic motor includes a protuberance provided to project from at least one of the first major surface of the stationary member and the second major surface of the movable member, for ensuring a predetermined clearance between the first major surface and the second major surface. The electrostatic motor may include a plurality of stationary members and a plurality of movable members, assembled with each other in a manner as to alternately arrange the stationary members and the movable members.

Abstract: An electrostatic motor includes a stator electrode member (1a) and a slider electrode member (1b). The stator electrode member (1a) and the slider electrode member (1b) are provided with drive electrode patterns (2), and the drive electrode patterns are covered by cover films (4). Surfaces of the stator electrode member (1a) and the slider electrode member (1b) contacting each other are provided with a plurality of minute projections (5). A clearance between the stator electrode member and the slider electrode member is maintained by the contact of the projections. The projections (5) may also be provided on only one of the stator electrode member (1a) and the slider electrode member (1b), with the other electrode member having a flat surface.

Abstract: Stator and slider film electrodes (1, 2) are integrally provided with spacer members (10; 10?; 10?; 15; 15?; 15?; 20). The spacer member is bonded to one end of a base film (4a) on which different phase electrode elements (3a, 3b, 3c) are disposed. After this, cover films (4b) are bonded to the two surfaces of the base film on which the spacer member is bonded to obtain a spacer-equipped film electrode.

Abstract: A multistage oil seal (4) includes a plurality of lips (7a, 7b, 7c) in a plurality of stages disposed around a motor shaft (1) of a machine tool along the axis of the motor shaft to protect internal members of the motor from the cutting fluid. All or at least two of the lips (7a, 7b, 7c) in the plurality of stages are formed from different materials.

Abstract: A method of production of electrodes for an electrostatic motor generating electrostatic force between a facing stator and slider, including forming core electrodes on a board of at least one of the stator and the slider by patterning a conductive substance and depositing a conductive substance on the core electrodes so that the side edges become rounded. Any method selected from electroplating, electroless plating, electrostatic coating, or screen printing can be used to deposit the conductive substance on the core electrodes. The core electrodes may be patterned using non-etching means. Further, electrodes for an electrostatic motor generating an electrostatic force between a facing stator and slider provided with core electrodes patterned on the board of at least one of the stator and the slider and a conductive substance deposited on the core electrodes to form deposition layers so that the side edges become rounded.

Abstract: A method of manufacturing an electrostatic motor including a stationary member with electrodes disposed on an insulating substrate at regular intervals, a movable member with electrodes disposed on an insulating substrate at regular intervals, a first support member for fixedly supporting the stationary member, and a second support member for movably supporting the movable member. A plurality of electrodes are formed on one surface of an insulating substrate and, simultaneously therewith, a light interrupting mark is locally formed on the surface independently of the electrodes, to produce the stationary or movable member. A local region of the insulating substrate adjacent to the light interrupting mark is irradiated with a light, whereby removing the local region along an edge of the light interrupting mark without substantially damaging the light interrupting mark, to provide a mounting recess in the stationary or movable member.

Abstract: An electrostatic motor includes a stator electrode member (1a) and a slider electrode member (1b). The stator electrode member (1a) and the slider electrode member (1b) are provided with drive electrode patterns (2), and the drive electrode patterns are covered by cover films (4). Surfaces of the stator electrode member (1a) and the slider electrode member (1b) contacting each other are provided with a plurality of minute projections (5). A clearance between the stator electrode member and the slider electrode member is maintained by the contact of the projections. The projections (5) may also be provided on only one of the stator electrode member (1a) and the slider electrode member (1b), with the other electrode member having a flat surface.

Abstract: An electrostatic motor provided with a stationary member including a first major surface and a first back surface opposite to the first major surface; and a movable member including a second major surface and a second back surface opposite to the second major surface, the movable member being arranged to be movable relative to the stationary member in a condition where the second major surface is opposed to the first major surface of the stationary member. The electrostatic motor includes a protuberance provided to project from at least one of the first major surface of the stationary member and the second major surface of the movable member, for ensuring a predetermined clearance between the first major surface and the second major surface. The electrostatic motor may include a plurality of stationary members and a plurality of movable members, assembled with each other in a manner as to alternately arrange the stationary members and the movable members.

Abstract: Stator and slider film electrodes (1, 2) are integrally provided with spacer members (10; 10?; 10?; 15; 15?; 15?; 20). The spacer member is bonded to one end of a base film (4a) on which different phase electrode elements (3a, 3b, 3c) are disposed. After this, cover films (4b) are bonded to the two surfaces of the base film on which the spacer member is bonded to obtain a spacer-equipped film electrode.

Abstract: A film-like electrode member, used as a stationary member or a movable member of an electrostatic motor. The film-like electrode member is provided with an insulating substrate including a major surface and a back surface opposite to the major surface; a plurality of electrodes arranged along the major surface of the insulating substrate at predetermined intervals; a main section including at least a part of the plural electrodes and of the insulating substrate carrying the electrodes; a locally thick section integrally joined to the main section and having a thickness larger than the main section; and a conducting element formed on the thick section and connected to the plurality of electrodes. The thick section includes a protrusion element having insulating properties and locally protruding from the major surface of the insulating substrate; and the conducting element is formed continuously on the insulating substrate and the protrusion element.