Abstract: A circuit device includes an A/D conversion unit that performs A/D conversion of a temperature detection voltage applied from a temperature sensor unit and outputs temperature detection data, a processing unit that performs a temperature compensation process of an oscillation frequency on the basis of the temperature detection data, and an oscillation signal generation circuit that includes a D/A conversion unit and an oscillation circuit and generates an oscillation signal using frequency control data received from the processing unit and a vibrator. The D/A conversion unit includes modulation circuit that receives the frequency control data of (n+m) bits and modulates n-bit data on the basis of m-bit data of the frequency control data, a D/A converter that performs D/A conversion of the modulated n-bit data, and a filter circuit that smoothes the output voltage of the D/A converter.

Abstract: Provided is a rotation detection device that detects a rotational direction and amount of a rotatable operation member. The detection device manages to reduce the rotation detection pitch while maintaining sufficient clearance for a rotation detection switch to operate. In other words, sufficient distance is given between rotation detection members such that the switch can accurately detect the movement from one member to the next. The rotatable operation member generally includes a plurality of switch driving sections that rotate in unison. A rotation detection switch generally includes a portion that moves in a first and second direction opposite to each other when coming into contact with the rotatable operation members, and is configured to output a detection signal at each movement. The switch and rotatable operation members are configured so that the movement direction of the detector is in a direction orthogonal to the circumferential direction of rotation.

Abstract: Disclosed are various embodiments of interpolation circuits for use in conjunction with optical encoders. The analog output signals provided by incremental or absolute motion encoders are provided to an interpolation circuit, which is capable of providing high interpolation factor output signals having high timing accuracy. The disclosed interpolation circuits may be implemented using CMOS or BiCMOS processes without undue effort.

Abstract: Disclosed are various embodiments of interpolation circuits for use in conjunction with motion encoders. The analog output signals provided by incremental or absolute motion encoders are provided to an interpolation circuit, which is capable of providing high interpolation factor output signals having high timing accuracy. Problems with noise spikes common to zero-hysteresis comparators typically employed in interpolation circuits are eliminated, as are problems with time delays differing between comparators that do feature hysteresis. The disclosed interpolation circuits may be implemented using CMOS processes without undue effort.

Abstract: In one embodiment of the present invention, a rotary encoding switch is disclosed such as used in the function setting for relays or similar. In one embodiment, a particularly secure function setting for relays or similar may be achieved by means of a rotary encoding switch with a number of switch stages with separations between the switch stages which are not constant.

Abstract: A high speed quadrature counter for use with a displacement measuring device is disclosed. The counter provides high speed counting by partitioning the tracking counter into a small fast tracking counter portion for the LSBs and a larger slow tracking counter portion for the MSBs. The fast tracking counter portion outputs a smaller number of bits according to a fast clock rate, while the slow tracking counter portion outputs a larger number of bits to update the remainder of the position at a slower clock rate. In various embodiments, the counter provides a corrected position value that has an effective timing within a few fast clock cycles of the time of the latch trigger signal. A corrected latched position circuit corrects an error that may otherwise be produced by the partitioning and the different clock rates of the fast and slow tracking counter portions.

Abstract: A method for providing a correlation between a periodic analog/digital conversion and an angle-synchronous signal, in which the periodic analog/digital conversion is provided with a timing mark, which correlates with the angle-synchronous signal, and is assigned to an angular position of a device via this timing mark.

Abstract: Method for coding at least one datum using three digital signals A, B, C delivered on respectively one channel, in which the third signal C is delivered by a combination of the first two signals A, B in order to form m binary triplets, where m<8. The method provides for modifying the third signal C according to the data to be coded in order to generate n binary triplets, where n>1, the n triplets being different from the m triplets. A device for determining the absolute angular position of a turning member is described.

Abstract: An apparatus for transmitting a position detection signal of a multi-shaft motor whereby a parallel-form detection signal that is output from position-detecting devices disposed on each of a plurality of motors and used for indicating a motor rotation position can be transmitted to motor drivers for controlling the driving of the motors via a group of a small number of wires. In the apparatus for transmitting a position detection signal of a multi-shaft motor, a transmission-side converter converts a parallel-form detection signal from rotary encoders to a serial signal and presents the resulting signal to a reception-side converter via a serial signal transmission path. The reception-side converter returns the received serial-form detection signal to a parallel-form signal and presents the signal to motor drivers.

Abstract: A main scale 10 has protrusive grating 12 of a thin film of e.g. Cr formed on a base member 11. The base member 11 and the Cr thin film constitute a reflecting face which is set to provide the sufficient quantity of received light on a light receiving side. The protrusive grating 12 can be formed accurately by photo-etching the thin film.

Abstract: A novel encoder system adapted for use in print architecture at least includes: a codewheel coupled to a rotating print architecture element; a first encoder sensor mounted at a first position relative to the periphery of the codewheel, the first encoder adapted to output a first output signal; a second sensor mounted at a second position relative to the periphery of the codewheel, the second encoder adapted to output a second output signal, and the second sensor positioned substantially 180 degrees relative to the first encoder sensor; and a logic correction circuit adapted to receive the first and second output signals, and for outputting a correction signal with a period that is the average of the periods of the first and second output signals.

Abstract: A rotary encoder has housing case provided with common electrode and signal electrode disposed to an area narrower than the entire circumference, or an angular range of generally ½ of the circumference in concentrical with central hole of housing case, and sliding contact in a confronting manner to the electrodes, the sliding contact provided with four combinations of contacts points arranged at four equally divided angular positions, or every 90 degrees along the same circumference about the rotary axis, each of the combinations comprises contact point on inner side for connectively sliding on common electrode and two contact points on outer side for connectively sliding on signal electrode. The rotary encoder of this structure can reduce the cost by decreasing a width of material needed for fabrication of electrodes, and decrease distances for contact points to slide on electrodes, to thereby improve durability to sliding abrasion.

Abstract: A sensor system is provided in which a digital absolute value of the particular position of a stationary part (stator) with respect to a part moving relative to it (rotor) is created, which is transferred in serial transmission to an evaluation circuitry, whereby transfer of the serial absolute value is induced each time by an external signal. In order to increase the resolution of the encoder, the change in absolute value is recorded each time in the sensor and finest interpolation is undertaken beginning each time from the time of the change. Finally, the absolute value is amended by the accumulated result of finest interpolation when interrogated by the external signal.

Abstract: Phase-locked oscillators (74, 152, 172, or 196) include both a digital integrator (82 or 146) and a digital lead compensator (84, 148, or 180), and use either analog (108) or digital (184) summation of integration and leadcompensation signals to provide a lead-compensated digital integrator (86, 150, or 182). Preferably, integration and/or lead compensation includes decoding UP and DOWN signals into plus one, minus one, and/or zero signals. The phase-locked oscillators (74, 152, 172, or 196) may include one or more nonlinear digital-to-analog converters (282, 292, 310, 340, or 370) for digital-to-analog converting the digital phase-locking information and the digital lead-compensation information.

Abstract: A position recognition arrangement for a selector lever in motor vehicles, in which a separate recognition switch is assigned to every valid and selectable position. The recognition switches are actuated simultaneously in a transition area from one position to the adjacent position. Preferably, the recognition switches are formed by mutually separate contact paths which extend in the operating direction of the selector lever, of which at least the respective adjacent contact paths are offset with respect to one another perpendicularly to the operating direction and overlap one another at least in a transition area relative to the perpendicular line with respect to the operating direction.

Abstract: An absolute encoder for detecting the absolute (as opposed to the relative) rotational displacement of an encoder shaft includes a pair of pitch signals recorded on tracks and an associated signal processing circuit. The pair of pitch signals have different periods (wave lengths) which are such that they have no common factors. The signal processing circuit includes magnetic sensors for producing absolute position data indicative of the degree of displacement of the encoder shaft, on the basis of the pitch signals. Through the use of a pair of pitch signals having periods with no common factor, a high degree of resolution is obtained, without having no significantly increase the number of pitch signal tracks.