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 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 permanent-magnet field rotor (20) for use in a synchronous motor such as an AC servo motor comprises a shaft (21), a pair of end plates (22, 23) fixed on the shaft (21) and axially spaced from each other, a plurality of permanent magnets (24) extending outwardly in the radial direction of the shaft (21) and axially extending between the end plates (22, 23), and a plurality of yokes (25) disposed between successive permanent magnets (24) and axially extending between the end plates (22, 23) to hold the permanent magnets (24). Each of said yokes (25) has an axial protrusion (34, 35) at either end thereof, and the end plates (22, 23) have provided therein engagement holes (26, 37) which serve, when engaged on the axial protrusions (34, 35) to prevent the yokes from moving circumferentially and radially.

Abstract: An optical absolute endoder, provided with a rotary code plate and fixed plate, for detecting the angle of rotation and the position of rotation of a motor, etc. The rotary code plate has a plurality of concentric code patterns with light passage portions and light blocking portions alternately arranged and a reference pattern comprised of just a light passage portion sandwiched between adjoining code patterns and arranged concentrically with the code patterns. The fixed plate is provided with first and second code pattern slit groups arranged in the radial direction of the rotary code plate at first predetermined intervals and corresponding to the code patterns and with reference pattern light passage portions provided at positions corresponding to the reference pattern at positions separated by exactly second predetermined intervals from the center line of the code pattern light groups. By this, fluctuations in the voltage level of the reference signals due to light leakage are prevented.

Abstract: The time for positioning of a machine under numerical control is determined so that the positioning is finished at the moment when the amplitude of vibration of the machine is reduced to zero. In the thus predetermined time at least accelerating control and decelerating control are conducted to achieve control for positioning the machine at a commanded position.