Abstract: A gyro apparatus comprising a gyro casing incorporating therein a gyro the spin axis of which is made substantially horizontal, a supporting apparatus for supporting the gyro casing with a freedom of three axes, a north-seeking apparatus for giving a north-seeking action to the gyro, a follow-up ring having a follow-up shaft which follows the gyro casing around its substantially vertical axis, a binnacle for supporting the follow-up shaft, a servo motor for rotating the follow-up shaft and a slip ring for supplying a power to the gyro and the like through the follow-up shaft, in which the follow-up ring is formed as a fork-shape and supported to the binnacle in a canti-lever fashion, the follow-up shaft is rotatably supported to the binnacle by one thin-type ball bearing having a large diameter and one bearing having a small diameter, the follow-up shaft is fixedly provided with a rotor of a pancake-type servo motor of a direct drive system, a stator of the servo motor is attached to the binnacle at the posit

Abstract: A gyro apparatus having a tuning fork and a detecting portion for detecting the moment generated by Coriolis force in the tuning fork is disclosed, in which the detecting portion is formed of a rectangular-shaped hinge, a base portion to which both ends of the rectangular-shaped hinge are fixed and a pair of detection piezo-electric elements fixed to the rectangular-shaped hinge spaced apart from each other in its up and down direction and in which the tuning fork is fixed to the central portion of the rectangular-shaped hinge between the pair of detection piezo-electric elements such that the tuning fork axis becomes substantially perpendicular to the longitudinal direction of the rectangular-shaped hinge portion and parallel to the plane of the rectangular-shaped hinge and the center of mass of the tuning fork coincides with the center of the rectangular-shaped hinge.

Abstract: A vibration-type gyro apparatus is disclosed, which includes a vibration mass portion, a piezo-electric element for detecting the displacement of the apparatus and a preamplifier having an input resistance R and supplied with the output from the piezo-electric element, wherein the input resistance R is selected to have a value substantially expressed as R.apprxeq.1/C.omega. (where C is an electrostatic capacity of the piezo-electric element and .omega. is a vibration angular velocity of the mass portion) so that the gyro apparatus will be substantially free of variations due to temperature changes.

Abstract: An erector for holding a spin axis of a gyro rotor in the vertical direction used in a gyroscopic horizon or gyro vertical which comprises a gyro casing incorporating therein a gyro rotor rotating at high speed, a spin axis of the gyro rotor being held substantially in the vertical direction, first supporting member for rotatably supporting the gryo casing around a first horizontal axis which is perpendicular to the spin axis and second supporting member for rotatably supporting the first supporting member around a second horizontal axis which is perpendicular to both the spin axis and the first horizontal axis is disclosed, which includes a base plate, a motor mounted on the base plate, a rotation receptacle container having an annular shape cavity and rotated at low speed by the motor, and liquid charged into the annular shape cavity of the rotation receptacle container, the base plate being mounted on the gyro casing such that the rotation axis of the rotation receptacle container and the spin axis of the

Abstract: A gyro apparatus is disclosed which includes a base table, a detecting piezoelectric element attached at its one end to the base table such that its longitudinal direction, is perpendicular to the surface of the base table, a tuning fork having a vibration surface parallel to the surface of the base table and disposed such that its axis is parallel to the surface of the detecting piezoelectric element, and an L-shaped attaching portion attached to a base portion of the tuning fork such that its one leg portion is parallel to said surface of the base table and extended in the direction to vibration mass portions of the tuning fork, wherein the one leg portion is attached with the other end of the detecting piezoelectric element.

Abstract: An accelerometer is disclosed, which includes a flexible hinge, a base table fixed with one end of the flexible hinge, a pendulum fixed to the other end of said flexible hinge, torquers for producing a torque proportional to acceleration applied from the base table to the pendulum and a displacement detecting apparatus for electrically detecting a relative displacement between the fixed portion of the base table and the pendulum, wherein the base table is formed of first and second frames, the first frame is provided with an engagement portion for engaging with the second frame, a fixed portion for the flexible hinge, a fixed portion for the displacement detecting apparatus. In this case, the first frame is provided at its outer peripheral portion with an attaching flange portion and, one plane of the flange portion is used as an attaching reference plane for attaching the accelerometer to a body the acceleration of which is to be measured.

Abstract: A gyro apparatus including a gyro case for housing a gyro therein, the spin axis of which is selected to be substantially horizontal, a container for accommodating therein the gyro case and containing a liquid within it, a first supporting device for supporting the gyro case within the container, a second supporting device for supporting the container in a manner that the container may have the freedom of three axes, and a vertical follow-up device for making the container to follow-up the gryo case around a gravity line, in which there is further provided a device in connection with the container for substantially changing the gap formed between the container containing the liquid and the gyro case from the outside of the container so as to adjust the displacement between the center of gravity of the gryo case and the center of viscous force caused by the liquid acting on the gyro case.

Abstract: In a gyrocompass in which a gyro is housed in a gyro case with a spin axis arranged substantially horizontal, a container is provided for surrounding the gyro case and for containing a liquid. A suspension wire supports the gyro case within the container and a supporting device is provided to support the case with three degrees of freedom. A vertical follow-up device ensures that the container follows the gyro case around a vertical axis. A detector supplies a detected signal to the follow-up device to produce a follow-up error responsive to displacement and twisting of the suspension wire so that a damping torque is applied to the gyro case. A delay element supplies the detected signal to the follow-up device to produce a follow-up error therein.

Abstract: A bearing apparatus is disclosed which has a first attaching member secured to a fixed portion, a flexible member, a second attaching member secured to a rotary portion, the flexible member being attached to the first and second attaching members, and a flexible portion formed on the flexible member. In this case, the neutral plane of the flexible portion includes the rotary axis of the rotary portion and the center in the lengthwise direction of the flexible portion coincides with the rotary axis of the rotary portion.

Abstract: A bearing apparatus is disclosed which has a first attaching member secured to a fixed portion, a flexible member, a second attaching member secured to a rotary portion, the flexible member being attached to the first and second attaching members, and a flexible portion formed on the flexible member. In this case, the neutral plane of the flexible portion includes the rotary axis of the rotary portion and the center in the lengthwise direction of the flexible portion coincides with the rotary axis of the rotary portion.

Abstract: A gyrocompass having a gyro rotor, and a device for applying to the gyro rotor about its vertical axis a torque in proportion to an inclination angle of the spin axis of the gyro rotor from a horizontal plane so as to attenuate the north-seeking action of the gyro rotor, in which the torque is controlled to be proportional to the inclination angle for its component which varies with a period same or close to that of the north-seeking action while to be approximately zero for a component of the inclination angle which does not vary.