Abstract:
An azimuth measuring device which can obtain offset information corresponding to one in the case where the direction of the azimuth measuring device is arbitrarily changed, without obtaining erroneous offset information when changing the direction of the azimuth measuring device while retaining its attitude with respect to a specific direction, is provided. A data processing section 19 processes data from a triaxial sensor which detects earth magnetism. In the data processing section 19, triaxial output data at the time when the direction of earth magnetism changes in a three dimensional space are repeatedly obtained not smaller than a predetermined number of times; the coordinates of a point where the variation of distances from a group of triaxial output data is minimum in a three dimensional coordinate which triaxial output data are related to respective axial components is estimated by using a statistical method, and is set as a reference point; offset information is calculated based on the coordinates of the reference point, and it is determined whether the group of triaxial output data is distributed in the vicinity of a specific plane; and when it has been determined that the group of triaxial output data is distributed in the vicinity of the specific plane, the coordinates of a reference point are not estimated, or the coordinates of an estimated reference point is deleted.
Abstract:
A magnetic sensor with a signal processing circuit which is constituted of a magnetic sensor section (4) formed from a compound semiconductor thin film or magnetic thin film, and a signal processing circuit (5) which amplifies a magnetic signal detected as an electrical output by the magnetic sensor section (4) and which is constituted of an operational amplifier circuit (51) and a constant current circuit (52) for feedback. The constant current circuit (52) in the signal processing circuit (5) has a plurality of resistors of two or more different temperature coefficients. The current output by the constant current circuit is characterized by that it has a temperature coefficient inversely proportional to that of a combined resistor of a plurality of the resistors.
Abstract:
According to the present invention, there is provided a polishing pad for polishing the surface of wafers for creating semiconductor integrated circuits, wherein said pad has a high polishing speed, said polishing is uniform, and said pad has a long life. Preferably, the polishing pad of the present invention comprises nonwoven fabric (base matrix) and a nonporous photo-setting resin that fills the space between the nonwoven fabric, and can be produced by impregnating the base matrix with a photo-sensitive resin composition containing at least one selected from the group consisting of a hydrophilic photopolymeric polymer or oligomer, and/or a hydrophilic photopolymeric monomer, and then photo-setting the same.
Abstract:
The present invention relates to a magnetic sensor with a sensitivity measuring function and a sensitivity measuring device and a method thereof having a magnetic substance on a semiconductor substrate provided with a plurality of Hall elements. Magnetic sensitivity surfaces (31) detect flux density, and a switching unit (32) extracts magnetic field intensity information of each axis, and inputs it to a sensitivity calculating unit (34) via an amplifier unit (33). The sensitivity calculating unit (34) calculates the sensitivity from the magnetic field intensity information about the individual axes from the magnetic sensitivity surfaces (31). The sensitivity calculating unit includes an axial component analyzing unit (34a) for analyzing the flux density from the magnetic sensitivity surfaces (31) into magnetic components of the individual axes; a sensitivity decision unit (34b) for deciding the sensitivity by comparing the individual axial components of the magnetic field intensity from the axial component analyzing unit (34a) with a reference value; and a sensitivity correction unit (34c) for carrying out sensitivity correction in accordance with the sensitivity information from the sensitivity decision unit (34b). A sensor diagnostic unit (39) carries out self-diagnosis of the validity of the sensitivity of the magnetic sensor according to the sensitivity information, and performs self-sensitivity correction (adjustment).
Abstract:
The present invention provides a voltage controlled oscillator having a wide frequency variation range and an oscillation frequency that shows favorable linearity with respect to control voltage. The present invention includes an amplifier circuit 21, a piezoelectric element 22 connected in parallel to the amplifier circuit 21 and forming a feedback loop, variable capacitive elements 24 and 25 respectively connected to an input terminal and an output terminal of the amplifier circuit 21 and having a capacitance value that is dependent on control voltage, and an analog operation circuit 26 that generates a control voltage Vcs based on an inputted control voltage Vc. In this arrangement, the control voltage Vc is applied to the variable capacitive element 24 and the control voltage Vcs generated by the analog operation circuit 26 is applied to the variable capacitive element 25.
Abstract:
Provided is a pointing device (10) that can be reduced in thickness even if a magnetic field sensor (5) is mounted to a front face of a printed circuit board (p). When a support portion (13a, 21a, 22f) laterally moves, a reverse face of a flexible portion is displaced while being guided away from the printed circuit board due to deformation of a mountain fold flexure portion (13i) as a directional deformation portion (13i, 22c). Therefore, a clearance between the reverse face of the flexible portion (13b, 22a) and the printed circuit board (P) increases, and the magnetic field sensor (5) can be mounted to the front face of the printed circuit board (P), thereby making it possible to reduce thickness of the pointing device (10). At the same time, the flexible portion (13b, 22a) would not be ruptured through sliding contact with the magnetic field sensor (5).
Abstract:
An AGC control section (110) has a first operation mode for controlling the gain of a variable gain amplifier (103) so that the amplitude of a synchronization signal measured by a synchronization signal amplitude measurement circuit (108) is maintained constant and a second operation mode not increasing the gain even if the amplitude of the synchronization signal measured by a video signal processing circuit (109) is smaller than a predetermined first reference value and reducing the gain of the variable gain amplifier (103) only when the video signal amplitude has become greater than a predetermined second reference value. Here, when the synchronization signal amplitude is smaller than the predetermined first reference value and the video signal amplitude is greater than the predetermined second reference value while the AGC control section (110) is operating in the first operation mode, the mode is switched to the second operation mode. On the other hand, when the synchronization signal amplitude has become smaller than the predetermined first value while the AGC control section (110) is operating in the second operation mode, the mode is switched from the second operation mode to the first operation mode.
Abstract:
In a motor control circuit which controls energization of a coil on the basis of a detection result of a rotor position, the control is performed so that the continuous rotation of the rotor due to its own inertia is suppressed and stopped in a short time, and that the reverse rotation of the rotor is prevented. When an external control signal CTL is changed from L to H, the normal rotation control is switched to reverse rotation control, so that a reverse brake state is effected. When motor rotation speed is monitored and reduced to a set rotation speed, a brake control signal SPSB is changed from L to H, so that a short brake state is effected. However, the motor continues to be rotated by its own inertia, and a position detection signal HALL is changed. Thus, reverse brake control is temporarily performed (only during a time period corresponding to a pulse width T RB ). The short pulse reverse brake control is intermittently performed until the motor is completely stopped. Therefore, it is possible to stop the motor in a shorter time as compared with the case where the motor is stopped only by the short brake control after the motor is decelerated to a rotation speed immediately before being stopped.