Abstract: An elongated oval track-shaped loudspeaker has a diaphragm of a track-shape having major and minor axes, and a pole piece of an elongated oval shape and disposed to conform its major axis to that of the diaphragm, whereby a sufficient space is secured for a width size of a diaphragm-supporting damper at its portions on both sides along the major axis of the diaphragm, a magnet around the pole piece is enlarged, and the pole piece is dimensioned in its sectional area to correspond to the magnet to cause no magnetic saturation.

Abstract: A multilayer printed wiring board is formed with a plurality of conductor layers laminated as a whole with insulating layers interposed, a non-penetrating via hole provided in the insulating layer as bottomed by the conductor layer exposed, a plated layer provided inside the via hole for electric connection between the conductor layers, the via hole being formed to be of a concave curved surface of a radius in a range of 20 to 100 &mgr;m in axially sectioned view at continuing zone of inner periphery to bottom surface of the via hole, whereby the equipotential surfaces occurring upon plating the plated layer are curved along the continuing zone to unify the density of current for rendering the plated layer uniform in the thickness without being thinned at the continuing zone.

Abstract: A pair of fiber optic coils are mounted on opposite sides of a flexural disk and are arranged to form an interferometer that produces an output signal in response to acceleration of the flexural disk. The flexural disk is mounted in a housing having first and second end plates with a sidewall extending between them. A support member extends between the end plates and through a central passage in the flexural disk. A pair of compressive dampers is mounted in the housing between the flexural disk and the housing end plates. A shear damper mounted on the central support member exerts a radial force on an inner edge of the central passage in flexural disk to dampen vibrations of the flexural member and control the output signal amplitude over a selected frequency range.

Abstract: A rotation sensing system includes a rotation sensor that produces a signal in response to an input rotation about a sensing axis. A servo system is arranged to rotate the rotation sensor at an angle about the sensing axis to null the signal from the rotation sensor such that the rotation sensor is substantially inertially stable. The rotation sensing system is mounted on a resolver arranged to measure the angle through which the servo system has rotated the rotation sensor.

Abstract: A trailer and hitch assembly are arranged so that the trailer may be towed closely behind a motor vehicle without articulation. A pair of frame members extends forward from the trailer for engagement into a corresponding pair of receivers that are included in a hitch extension assembly. Locking mechanisms are arranged to secure the frame members to a hitch cross member that may be included in a standard trailer hitch connected to the motor vehicle.

Abstract: A mattress provides side support that reduces the likelihood that a person will accidentally roll off and also provides increased comfort to a person sitting on the side of the mattress. The mattress includes a top layer, a bottom layer and a buffer layer between the top and bottom layers. A pair of support members are placed in corresponding cavities near the opposite sides of the top layer. The support members are firmer than the top layer and are arranged to support the top layer and provide reduced compression of the mattress when a weight is placed on the upper surface of the top layer near the support members.

Abstract: An optical phase transient is added to the optical signal input to an interferometer sensor array in addition to a CW phase generated carrier used for acquisition of the interferometer phase shift. Detection of an error signal associated with the transient is used to adjust the modulation depth of the CW phase generated carrier to a null the error signal so that there is a known ratio between the coefficients of the sine and cosine terms in the interferometer output signal to allow for normalization.

Abstract: A suspension for a gyroscopic float assembly in a floating gyroscope system comprises a pair of flexures that each have an outer rim and a plurality of flexure beams extending from the outer rim. A plurality of flexure tabs extend outward from outer perimeter portions of the rims for mounting the flexure assembly to a pair of end caps. A plurality of strain relief passages formed in the rims is arranged to provide relief from thermally induced stresses. A plurality of angular stops formed in inner perimeter portions of the rims is arranged to constrain the flexure against rotation about a selected axis.

Abstract: A fiber optic displacement sensor includes a flexural disk assembly affixed to a mounting post that extends from a support base that is enclosed by a housing. Spiral wound optical fiber coils are mounted on opposite sides of the flexural disk with optical fiber leads extending from both the inner and outer diameters of the optical fiber coils and being optically coupled together to form an interferometer. An inertia ring connected to the periphery of the flexural disk has a plurality of peripheral slots therein for routing the optical fiber leads from the optical fiber coils to other components in the housing. The slots in the inertia ring are arranged to allow differing lengths of fiber to be wound circumferentially in different depth slots to accommodate mismatches in optical fiber lead lengths.

Abstract: A fiber optic array cable comprises a plurality of constituent cables that each include an optical fiber, a strength member connected to the optical fiber to provide tensile strength and a jacket surrounding the optical fiber and the strength member. A harness is arranged to enclose the plurality of constituent cables securely. The strength member preferably is formed of a plurality of metal strands layered around the optical fiber.

Abstract: A diaphragm of electroacoustic transducer has an edge formed with alternately up-rolled and down-rolled portions with respect to vibration plane of the diaphragm and disposed at regular intervals in circumferential direction and with sloped-plane portions respectively connecting rims opposing above and below of adjacent ones of the up-rolled and down-rolled portions, the sloped-plane portions extending in respective tangential lines with respect to an inner periphery of the edge and intersecting the circumferential direction at an alternately opposite angle with respect to the vibration plane.

Abstract: A hemadynamometer has an air bag designed for attaining oppression or ischemia of radial artery only without oppressing ulnar artery, with a length of the bag made, when the bag is wound on a user's wrist on its radial side starting from such hard organization area as tendons on palm side of the wrist through the radial artery, to reach at least styloid process of radius but not to reach the ulnar artery, and with a width set for locally oppressing the radial artery at least substantially right above the styloid process of radius in longitudinal direction of the wrist.

Abstract: A displacement sensor and an acceleration sensor are mounted to a common support member. The displacement sensor comprises a first circular flexural disk having a natural frequency less than the frequency range of the acoustic waves of interest. Spiral-wound optical fiber coils are mounted to opposite sides of the first flexural disk. The acceleration sensor comprises a second flexural disk having a natural frequency greater than the frequency range of the acoustic waves. Spiral-wound optical fiber coils are mounted to opposite sides of the second flexural disk. A fiber optic interferometer provides an output signal that is a combination of signals output from the displacement sensor and the acceleration sensor. The displacement sensor includes an inertia ring mounted to an edge of the first flexural disk to keep it nearly stationary when an acoustic wave in the selected frequency range is incident upon the housing.

Abstract: A method for eliminating signals from false targets in a secondary surveillance radar system includes the steps of obtaining plots of radar data for the same target. The range from the radar system to the targets is determined, and the target plot having smallest range of all target plots that indicate reflection of radar signals from the same target is accepted as being a real target. Other target data is rejected as being from a radar reflector. The coordinates of radar reflectors may be stored in a database to form a map of reflectors in the vicinity of the radar.

Abstract: A fiber optic sensor comprises a flexural disk having a pair of fiber optic coils mounted on opposite sides thereof and connected together to form an interferometer that produces an output signal in response to acceleration of the flexural disk. The flexural disk is mounted in a housing having first and second end plates with a sidewall extending between them. The sidewall is formed to have an inwardly facing groove in which an outer edge portion of the flexural disk is mounted. A support member extends between oppositely facing portions of the first and second end plates and through a central passage in the flexural disk. A damping member is mounted on the central support member and arranged to exert a radial force on an inner edge of the central passage in flexural disk to dampen vibrations of the flexural disk and control the sensor output signal amplitude over a selected frequency band in order to maximize dynamic range.

Abstract: A closed loop gain circuit controls the gain of a variable gain amplifier and provides a stable AGC response irrespective of the actual gain level. The amplifier may be arranged to amplify electrical signals output from a fiber optic gyroscope. A perturbation injection circuit provides a perturbation signal ±d to a phase modulator connected to the fiber optic gyro. A perturbation compensation circuit applies perturbation compensation signals to signals output from the variable gain amplifier and produces a compensated signal by reducing the magnitude of the perturbation in the amplified signal output from the variable gain amplifier. A gain error circuit connected to the perturbation compensation circuit produces a gain error signal that indicates the magnitude of the perturbation signal remaining in the amplified signal after perturbation compensation. A feedback system provides a gain control signal to the variable gain amplifier to reduce the magnitude of the gain error signal.

Abstract: A video interface circuit reduces loading losses when a video system component, such as a television receiver, is connected to a transmission line by amplifying the video signal with a high frequency amplifier and providing positive feedback of the amplified signal to the cable.

Abstract: An optical waveguide is formed in an integrated optics chip that includes a substrate formed of an electrooptically active material. The optical waveguide network has an input facet where optical signals may be input to the optical waveguide network and an output facet where optical signals may be output from the optical waveguide network. A structure is located in an upper layer of the substrate to prevent surface waves that propagate in the substrate from cross coupling into the output facet.