Abstract: An optical encoder includes a light emitting part for emitting light, a stationary slit part and a rotational slit part which allow part of the light emitted from the light emitting part to pass therethrough, a light receiving part for detecting the light passing through the stationary slit part and the rotational slit part, and a support for supporting the stationary slit part. The stationary slit part includes a patterned portion in which a plurality of slits for allowing light to pass therethrough are formed, a fixed portion fixed to the support, and an elastic structure which is elastically deformable and provided between the patterned portion and the fixed portion.

Abstract: An optical encoder includes a light emitting part for emitting light, a stationary slit part and a rotational slit part which allow part of the light emitted from the light emitting part to pass therethrough, a light receiving part for detecting the light passing through the stationary slit part and the rotational slit part, and a support for supporting the stationary slit part. The stationary slit part incudes a patterned portion in which a plurality of slits for allowing light to pass therethrough are formed, a fixed portion fixed to the support, and an elastic structure which is elastically deformable and provided between the patterned portion and the fixed portion.

Abstract: An optical encoder includes a light emitting part for emitting light, a stationary slit part and a rotational slit part which allow part of the light emitted from the light emitting part to pass therethrough, and a light receiving part for detecting the light passing through the stationary slit part and the rotational slit part, in which the stationary slit part is made of resin. The optical encoder also includes a support for supporting the stationary slit part, and the stationary slit part is fixed to the support by adhesive.

Abstract: When a communication abnormality occurs between an encoder and communication circuit apparatus in a work apparatus feeding back data output from encoders for control by a control apparatus, an encoder communication circuit is used in place of the encoder to identify the location of occurrence of the abnormality. The encoder communication circuit outputs encoder data comprised position or speed data and alarm data to said control apparatus when connected to the control apparatus through a communication cable.

Abstract: An encoder having a function for detecting noise which may affect an internal signal of the encoder, without using a noise detecting circuit within the encoder, whereby the cost and size thereof may be reduced. The encoder has a detecting part adapted to detect the movement of an electric motor or a driven object; a signal processing circuit adapted to process a detection signal from the detecting part and obtain positional data of the motor or the object; and a transmitting part adapted to transmit the positional data from the signal processing circuit at regular time intervals and a fluctuation component calculated on the basis of the positional data, to external equipment. The signal processing circuit has a fluctuation component detecting circuit adapted to detect a fluctuation comment included in the calculated positional data, and the detected fluctuation component is transmitted to the external controller as an amount of noise.

Abstract: A reliable encoder capable of reducing vibration of a printed board when the encoder is subjected to vibration or shock, by means of a simple structure. The encoder has a housing, a rotating code plate arranged in the housing and configured to rotate in synchronization with an object to be measured, a printed board attached to the housing and positioned above the rotating code plate, wherein the encoder has a reinforcing member configured to contact a portion of the printed board where the displacement of the printed board is large while the printed board is resonated due to vibration or shock applied to the encoder.

Abstract: An amplitude calculation apparatus or an amplitude calculation program of an output signal of an encoder dividing a resurge waveform into a predetermined number of angle areas, presetting and storing coefficient ? of the A-phase and the coefficient ? of the B-phase corresponding to the divided angle areas, the coefficients being set so that ?A+?B approximates the radius of the theoretical resurge waveform, calculating the radius of the resurge waveform as ?A+?B, and making the calculated radius the amplitude of the output signal of the encoder or converting a phase angle ? of a quadrant n to a phase angle ?? of the quadrant 1, and calculating the radius of the resurge waveform as ?|A|+?|B|, whereby the circuit size of the apparatus for calculating the resurge radius from the output of the encoder is reduced and the processing time by software for calculating the resurge radius is shortened.

Abstract: A reliable encoder capable of reducing vibration of a printed board when the encoder is subjected to vibration or shock, by means of a simple structure. The encoder has a housing, a rotating code plate arranged in the housing and configured to rotate in synchronization with an object to be measured, a printed board attached to the housing and positioned above the rotating code plate, wherein the encoder has a reinforcing member configured to contact a portion of the printed board where the displacement of the printed board is large while the printed board is resonated due to vibration or shock applied to the encoder.

Abstract: An encoder having a function for detecting noise which may affect an internal signal of the encoder, without using a noise detecting circuit within the encoder, whereby the cost and size thereof may be reduced. The encoder has a detecting part adapted to detect the movement of an electric motor or a driven object; a signal processing circuit adapted to process a detection signal from the detecting part and obtain positional data of the motor or the object; and a transmitting part adapted to transmit the positional data from the signal processing circuit at regular time intervals and a fluctuation component calculated on the basis of the positional data, to external equipment. The signal processing circuit has a fluctuation component detecting circuit adapted to detect a fluctuation comment included in the calculated positional data, and the detected fluctuation component is transmitted to the external controller as an amount of noise.

Abstract: A center voltage of an analog signal from a magnetic sensor is measured to match a reference voltage with the center voltage. Then, a combination of portions to be disconnected of adjustment patterns 1 and 2 of adjustment circuits 1 and 2 is determined so that the reference voltage is adjusted to the measured center voltage, and the portions are disconnected. The adjustment circuits 1 and 2 respectively include recovery patterns 1 and 2. If an adjustment pattern 1 and 2 is erroneously disconnected, the corresponding recovery pattern 1 and 2 is short-circuited by means of soldering or the like to short-circuit the adjustment pattern 1 and 2 once again.

Abstract: A fan having a function for detecting a fault such as a breakage or a loss of a rotating part of the fan as well as reduction in the rotational speed of the fan, the function being not affected by an operating condition of the fan. The fan includes a stationary part, a rotating part rotatably attached to the stationary part, a first electric circuit arranged on the rotating part, a second electric circuit arranged on the stationary part, the second electric circuit being electromagnetically connected to the first circuit, and a fault detecting circuit electrically connected to the second electric circuit, for detecting a fault of the rotating part.

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 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 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: In an encoder which is equipped with two detectors arranged on both sides of a rotating shaft in order to eliminate an eccentricity error, the mounting of the detectors is facilitated by making provisions so as to not cause a problem in the calculating of an average even if the detectors happen to be so mounted that the difference between the angular values calculated from the outputs of the respective detectors becomes equal to 180°. In an initialization process after power on, the difference ?? between the angular values ?1 and ?2 calculated from the signals output from the respective detectors is stored as an initial value. Position data ? is output by taking an average between ?3 and ?2, where ?3 is a value obtained by correcting ?1 by the initial difference ??.

Abstract: A magnetic type angle sensor includes a rotary body having a first sensed part provided on a circumferential surface thereof with projecting parts and recessed parts at equal intervals in a circumferential direction thereof and a second sensed part provided on a circumferential surface thereof with a projecting parts at just one location, and a magnetic sensing device for sensing a change in a magnetic field along with rotation of the rotary body. The rotary body is formed with a plurality of projecting parts and recessed parts in a gear shape by gear cutting on the circumferential surface, then is cut with a groove at the center thereof in the axial direction thereof and has all projecting parts in a half section in the axial direction thereof cut off except for one.

Abstract: An optical encoder having a structure for preventing water or the like from adhering to a V-shaped groove of a code plate of the encoder. The optical encoder has a protective plate made from an optically transmissive material, the protective plate being positioned adjacent to a surface of the code plate on which the V-shaped groove is formed.

Abstract: When a communication abnormality occurs between an encoder and communication circuit apparatus in a work apparatus feeding back data output from encoders for control by a control apparatus, an encoder communication circuit is used in place of the encoder to identify the location of occurrence of the abnormality. The encoder communication circuit outputs encoder data comprised position or speed data and alarm data to said control apparatus when connected to the control apparatus through a communication cable.

Abstract: A seal structure for an electric circuit unit is formed of an elastic material and includes an annular seal member mounted between an inner peripheral surface of an opening formed in a casing to pass a cable therethrough and an outer peripheral surface of the cable, a fixed member fixed on the casing at the opening, and a size-changing member formed with a through hole for allowing the cable to pass therethrough and adapted to change the size of the opening of the casing so as to fit the size of the outer periphery of the cable. The size-changing member is fixed in the opening, so that the fixed member is deformed by being held between the size-changing member and the fixed member, thereby bringing the seal member into close contact with the inner peripheral surface of the opening of the casing and the outer peripheral surface of the cable.

Abstract: An amplitude calculation apparatus or an amplitude calculation program of an output signal of an encoder dividing a resurge waveform into a predetermined number of angle areas, presetting and storing coefficient ? of the A-phase and the coefficient ? of the B-phase corresponding to the divided angle areas, the coefficients being set so that ?A+?B approximates the radius of the theoretical resurge waveform, calculating the radius of the resurge waveform as ?A+?B, and making the calculated radius the amplitude of the output signal of the encoder or converting a phase angle ? of a quadrant n to a phase angle ?? of the quadrant 1, and calculating the radius of the resurge waveform as ?|A|+?|B|, whereby the circuit size of the apparatus for calculating the resurge radius from the output of the encoder is reduced and the processing time by software for calculating the resurge radius is shortened.