Abstract: A dynamic amount sensor has a detecting circuit that detects a change in an electrostatic capacitance of each of electrostatic capacitance elements comprised of a movable electrode and a fixed electrode. A switching circuit switches the detecting circuit to first and second connecting states that detect changes in the electrostatic capacitance of the electrostatic capacitance elements in accordance with a change in an attitude of the movable electrode in corresponding first and second detecting axes directions. In the first and second connecting states, the detecting circuit includes circuits formed by connecting the electrostatic capacitance elements in series which change electrostatic capacitances symmetrically along with inclination of the movable electrode in the corresponding first and second detecting axes directions.

Abstract: An angular velocity sensor amplifies a plurality of detection signals using one amplifying circuit and separates these detection signals after amplification. The angular velocity sensor detects displacements of a mass in the axial directions using x-, y- and z-axis detection circuits. A carrier wave whose phase is shifted 90° from that of a carrier wave of the z-axis detection circuit is applied to the x- and y-axis detection circuits and outputs of the axis detection circuits are collectively inputted to a current/voltage conversion circuit which outputs a combined signal to three synchronous detection circuits that separate the signal into x-, y- and z-axis detection signal components.

Abstract: It is an object of the invention to promote a detection sensitivity by effectively utilizing an arranged fixed electrode. Inclinations in x-axis and y-axis directions of a mass are detected in a two-axis detecting circuit. The two-axis detecting circuit is constituted by fixed electrodes having both of an x-axis detecting circuit function and a y-axis detecting circuit function and also having functions for detecting displacements in an x-axis direction and a y-axis direction. The two-axis detecting circuit switches the x-axis detecting circuit function and the y-axis detecting circuit function by switching wirings in the circuit by way of a switching circuit. Switching of a wiring state of the two-axis detecting circuit is carried out at each constant period based on a timing of a specific clock signal.

Abstract: An angular velocity sensor amplifies a plurality of detection signals using one amplifying circuit and properly separates these detection signals after amplification. The angular velocity sensor detects displacements of a mass in the respective axial directions using an x-axis detection circuit, a y-axis detection circuit and a z-axis detection circuit respectively. A carrier wave which has a phase thereof shifted from a phase of a carrier wave of the z-axis detection circuit by 90° is applied to the x-axis detection circuit and the y-axis detection circuit, wherein the application of the carrier wave to the x-axis detection circuit and the y-axis detection circuit is performed by switching based on a clock signals. Outputs of the respective axis detection circuits are collectively inputted to a current/voltage conversion circuit.

Abstract: Detection accuracy of a sensor is improved by reducing an influence of an exogenous noise. Acceleration acting on an object is detected based on a change of posture of a mass part supported by a flexible substrate. The flexible substrate is fixed at a frame and the mass part is fixed by soldering at the center thereof. When a force such as acceleration acts on the mass part, the posture of the mass part changes and the flexible substrate also becomes deformed. The change of posture of the mass part and the deformation of the flexible substrate are detected based on the amount of change of a circuit constant of a piezoresistive element as a detecting element provided at a beam part. A signal processing circuit for processing a signal detected by the detecting element is formed on an IC chip, by which the mass part is configured.

Abstract: A ferrule has a tubular body for supporting an end of an optical fiber having a coated end. A holder is disposed at a rear end of the tubular body for supporting the coated end of the optical fiber. A collar member is connected to the holder and has a through-hole through which a portion of the holder extends. A positioning groove is disposed at an outer peripheral surface of the collar member for positioning with respect to an optical connector housing.

Abstract: An optical fiber connector has a stop ring having an end portion having an outer periphery and an optical fiber cable having a strength member extending from an end thereof. An adhesive material is disposed over the end portions of the stop ring and the optical fiber cable so that at least a portion of the strength member of the optical fiber cable is embedded in the adhesive material. A heat-shrinkable tube has an inner surface and is disposed on the adhesive material so that the portion of the strength member is disposed between the inner surface of the heat-shrinkable tube and the outer periphery of the stop ring.

Abstract: A ferrule has a tubular body for supporting an end of an optical fiber having a coated end. A holder is disposed at a rear end of the tubular body for supporting the coated end of the optical fiber. A collar member is connected to the holder and has a through-hole through which a portion of the holder extends. A positioning groove is disposed at an outer peripheral surface of the collar member for positioning with respect to an optical connector housing.

Abstract: A single transmission line bidirectional optical communication system comprising a directional coupler employing a polarizing beam splitter, an optical transmitting circuit for coding the data and converting the coded data into optical signals and outputting said signals, an optical receiving circuit employing a comparator having a function of automatically establishing a threshold for converting optical input signals into electrical signals and then decoding the data, a circuit for detecting the frequency differences between the sending signals and receiving signals, and a line diagnosing circuit.The polarizing beam splitter eliminates a near-end reflected beam, and the optical receiving circuit having a function of automatically establishing a threshold eliminates a remote-end reflected beam. The line diagnosing circuit diagnoses the line condition by comparing the sending frequency and receiving frequency.