Abstract: An angle data computation apparatus, which comprises arithmetic means (4) for computing the angle data by considering the encoder signals in different phases as triangular-wave signals; correction data storage means (5) for storing correction data for correcting angle errors between the encoder signals and triangular-wave signals based on arithmetic data from the arithmetic means (4) serving as addresses; adder-subtracter means (6) for adding up the arithmetic data from the arithmetic means (4) and the correction data from the correction data storage means (5); and converter means (7) for converting the angle corresponding to the quadrant for the encoder signals.

Abstract: A dustproof type connector comprising a male member 41 having male contact pins 42 and one recess or projection 43 on the internal surface thereof, a female member 44 having a dustproof packing stopper cap 46 on the top thereof, having female contacts 45 which are connected with the male contact pins 42 and which are connected with a pull-out cable which penetrates the dustproof packing stopper cap 46, and having one projection or recess 47 on the external surface thereof to link with the projection or recess 43 of the male member 41, and a dustproof packing 48 having the internal diameter slightly larger than the external diameter of the male member 41 and the external diameter larger than the external diameter of the dustproof packing stopper cap 46, and a dustproof type encoder which employs the dustproof connenctor of this invention.

Abstract: Rotation of a code plate fixed to a shaft of a detecting object is detected for producing a one-rotation signal and an incremental signal corresponding to a division of one revolution into a plurality of equal sections. The incremental signal is counted by a counter, thereby detecting an absolute position using an encoder. The counter is cleared in response to a one-rotation signal arriving first after the encoder starts its detecting operation. The counter continues to count the incremental signal in proportion to rotation of the shaft of the detecting object after its count value is once cleared, without clearing the count value in response to subsequent one-rotation signals. Thus, the counter obtains an absolute distance from a position where the counter received the first one-rotation signal to a present position.

Abstract: 2M-bit position data is divided into lower-order M-bit data and higher-order M-bit data. The lower-order M-bit data is stored in a lower-order storage area (14a) of a read only memory (ROM) (14), the higher-order M-bit data is stored in a higher-order storage area (14b) of the ROM. The lower-order and higher-order items of M-bit data are read out of the lower-order storage area (14a) and higher-order storage area (14b) by making the most significant bit of address data "0" and "1" successively by way of an address changing unit (15). These items of data are combined by a combining unit (17) to obtain 2M-bit position data.

Abstract: An absolute position encoder for detecting the position of a moving object includes a coding part attached to the moving object which receives sinusoidal and cosinusoidal signals through channels. Each channel receiving signals having a different number of cycles from the other channels per unit of movement of the object. The signals received by each channel are converted to digital form by an analog to digital (AD) converter and stored in a ROM. Discrepancies between the sinusoidal and cosinusoidal phase are corrected digitally by comparing the digital results of the channels, adjusting the data from higher-order channels to conform to that of adjacent lower-order channels, and finally combining the data for each channel to obtain the absolute position of the moving object.

Abstract: An encoder having two encoder units. An encoder having two encoders each having means for storing offset between said two encoder units and means for reading and correcting the offset. An encoder having an encoder with means for storing amplitude difference and phase difference between the encodes and means for reading and correcting the amplitude difference and phase difference, and further having two encoder units and means for generating an offset erasing signal between the two units. An encoder having an encoder that has means for storing offset between each unit and the offset erasing signal generating means, and means for reading and correcting the offset, and further having two encoder units and means for generating an offset erasing signal between the two encoder units. An encoder has means for storing amplitude difference and phase difference between the units, and means for reading and correcting the amplitude difference and phase difference.

Abstract: The invention relates to a reference-point return method for returning a movable element of a machine to a reference point using solely a linear scale, without relying upon a limit switch. The method includes providing the linear scale (1) with a second scale portion (2) for stipulating a deceleration starting position and a reference-point position, in addition to first scale portion (3, 4) for generating two-phase signals for position detection, generating signals (S.sub.1, S.sub.2) indicative of the deceleration starting position (D) and reference-point position (O) from the second scale portion (2) of the linear scale, slowing a reference point return rapid-traverse velocity (Va) to a reference-point return rapid-traverse velocity (Vb) using the deceleration starting signal (S.sub.1), and effecting return to the reference point by stopping movement in response to the reference-point signal (S.sub.2).

Abstract: An optical encoder, having an offset adjustment function for causing light receiving element outputs to have the same direct current component level, and capable of greatly reducing an adverse affection by noise, to thereby generate an accurate position signal. A combined signal (i10), generated in a third electric current mirror circuit (T17-T19) for receiving output currents (ia11, ia12) from light receiving elements (A11, A12) through first and second electric current mirror circuits (T11-T13, T14-T16) and serving as a feedback signal (i10', i10") for eliminating an offset between direct current components of the output currents of the light receiving elements, is superimposed through a variable resistor (VRa1) on these output currents.

Abstract: An absolute position encoder comprising a rotary code plate for obtaining sine wave outputs of a plurality of channels each having a different number of cycles per revolution, A/D converters for respectively A/D-converting the sine wave outputs of the plurality of channels for constituting rotational angular data of the code plate, and a ROM for storing at corresponding addresses interpolated data obtained by interpolation of angular data of one wavelength of the channels into a predetermined number of divisions sequentially using outputs of the A/D converters corresponding to the channels as address data, and for storing at corresponding addresses corrected data obtained by correction of an interpolation error included in interpolated data of upper channels having small numbers of cycles based on correction address data using interpolated data of lower channels having large numbers of cycles as the correction address data, wherein an absolute position of a moving body is detected by synthesis of the interpol

Abstract: A digital pulse circuit receives parallel N digital signals, assuming N is an even integer equal to or greater than 4, the levels of the signals inverted every time a constant quantity of change in an objective quantity to be measured occurs, any phase differences between the successive signals of the signals about 1/N of the constant quantity; has a logic circuit which enables only two signals which can change state in due process corresponding to the next change of the objective quantity to be measured, to enter the next stage; and synchronizes each of the N digital signals by a clock pulse, to make any phase difference among the N digital signals equal to or more than a predetermined phase difference, and the remove the influence of noise superposed on the digital signals (FIG. 10).

Abstract: A signal processing apparatus for a pulse encoder for electrically processing an output signal from a signal generating source and improving the resolution of the encoder. A sine-wave signal and a cosine-wave signal supplied from the signal generating source are converted into digital signals by a first and a second A/D converters, and supplied to a signal converting device. The signal converting device outputs an analog amplitude level and position data in response to the outputs from the first and second A/D converters. Consequently, the signal processing apparatus for the pulse encoder has a simple circuit arrangement and a small size, furthermore, the apparatus can confirm the intensity of a signal supplied from the signal generating source.

Abstract: A light receiving element (1) and an operation transistor (3) are connected in series, a plurality of signal output transistors (5a, 5b) are current-miller-connected to the operation transistors (3) in parallel, and photoelectrically converted output signals (O.sub.1, O.sub.2) are separately applied to a plurality of circuits in parallel from the plurality of the signal output transistors (5a, 5b). As a result, in the plurality of the circuits which receive the photoelectrically converted output signals (O.sub.1, O.sub.2) in parallel to carry out predetermined processes, interference will not occur, the signals are processed correctly, the power consumption is reduced, and the speed of responsitivity is improved.

Abstract: A pulse encoder has a motor detecting portion (1) which detects a motion of an object whose position should be measured and which outputs a signal having information regarding the motion. A clock generator (3) outputs a clock pulse. The pulse encoder processes the information regarding the motion synchronized by the clock pulse. The pulse encoder includes a clock malfunction detecting portion (4) which receives the clock pulse and at least a part of the signal having information regarding the motion showing whether the object, whose position should be measured, has moved or not. The clock malfunction detecting portion outputs a clock malfunction signal when motion is detected by the part of the signal having information showing whether the object has moved or not, when the clock pulse is not output.

Abstract: A circuit for an encoder apparatus of an incremental-type construction, including: a unit mechanically joined to a movable machine; a unit for outputting at least two signals having a phase shift and a periodic waveform in response to movement of the unit; a battery-type power supply; and an electric ciruit including a circuit for generating a timing pulse having predetermined frequency and pulse width, a circuit for detecting a change of the signals from the signal outputting circuit and for outputting a pulse signal in response to the change of signals, and a circuit for counting the pulse signal from the signal-change detecting circuit. The apparatus may be optical or magnetic in construction.

Abstract: A rotary encoder apparatus of an incremental-type construction, including: a rotary unit mechanically joined to a movable machine; a unit for outputting at least two signals having a phase shift and a periodic waveform in response to rotation of the rotary unit; a battery-type power supply; and an electric circuit including a circuit for generating a timing pulse having predetermined frequency and pulse width, a circuit for detecting a change of the signals from the signal outputting circuit and for outputting a pulse signal in response to the change of signals, and a circuit for counting the pulse signal from the signal-change detecting circuit. The apparatus may be optical or magnetic in construction.

Abstract: Disclosed is a motor speed detecting device which comprises a first slotted disc (3) having one slot and mounted on a rotational shaft (2) of a motor (1) that is driven by a motor drive unit (7) and a second disc (4) having a plurality of slots, a first magnetic sensor (5) mounted on the first gear (3) in close proximity thereto and outputting two signals with a phase difference and a second magnetic sensor (6) mounted on the second slotted disc in close proximity thereto and outputting two signals with the phase difference and their inverted signals and a detector circuit (8) receiving the output of the first and the second magnetic sensors.