Abstract: A rotation sensor having a vibrating cantilever beam is disclosed herein. The sensor comprises an integral single crystal silicon cantilever beam and support structure, an oscillator circuit for generating an electrical signal vibrating the cantilever beam at or near its natural resonant frequency and a piezoresistive element formed at the base of the base of the vibrating beam. The piezoresistive element is only sensitive to the stresses induced in the beam due to the rotation of the beam about an axis parallel to its length.

Abstract: A wind power generator includes a flexible sheet or fabric supported under tension within a housing frame which guides an airflow therethrough and across the surfaces of the membrane. As the airflow passes over the surfaces, vortices are created which cause the membrane to vibrate. Energy conversion units are coupled to the membrane to tap the oscillatory motion and convert it into other useful energy forms, e.g., electrical, hydraulic or mechanical. Alternately, the membrane can be formed of a plurality of fabric strips which are connected to the energy conversion unit and are dimensioned in width equal to the pitch of the vortices. The distances between the strips preferably are also equal in dimension to the vortices' pitch.

Abstract: A vibrator having a resonant frequency within a knocking frequency range forms a part of a magnetic path. The vibrator vibrates in response to the vibration of an internal combustion engine and this changes the reluctance of the magnetic path. The change in the reluctance is sensed by a coil to detect the presence of knock. The vibrator is enclosed with a damper substance consisting of a liquid or sol substance having viscosity of flow properties so that the vibration of the vibrator is restricted and the Q of the resonance characteristic of the vibrator is deteriorated, thus increasing the substantial range of frequency detection of the apparatus. If necessary, the damper substance is heated to maintain its viscosity at a predetermined value.

Abstract: A system for isolating the mounting pads of a vibrating beam or tuning fork force transducers from longitudinal vibrations generated by transverse vibrations of the beam or tuning fork tines which extend between the mounting pads. The system includes an arrangement of longitudinally resilient support links and masses that flex responsive to change in the length of the beam or tines as the beam or tines vibrate transversely. The support links and masses thus isolate the mounting pads from the longitudinally vibrations of the beam or tuning fork tines while allowing transmission of forces applied between the mounting pads which vary the force dependent resonant frequency of the beam or tuning fork.

Abstract: A magnetostatic wave device for microwave signal processing which includes an input or output transducer finger arrangement which allows shaping of the device response. Two sets of interdigitated fingers are connected to receive the same microwave input signal which is power divided between the two sets. The fingers of one set are substantially parallel to, and in side-by-side relationship with, the fingers of the other set. The device may be used for delay lines, filters, signal correlation, oscillators and numerous other microwave signal processing arrangements.

Abstract: A tuning fork and a manufacturing method thereof which is obtained by punching and folding a material of invariable elasticity. The material is formed in the shape of a plate and processed through a rolling operation, wherein the plate is punched into an approximately V-shape such that the folding line appears at a right angle with respect to the rolling direction of the plate. A piezoelectric element serving as an electrical mechanical conversion device is provided on a vibrating portion.

Abstract: A tuning fork resonator which has a substantially U-shaped tuning fork supported in spaced relation to a support base by means of a support system with at least three support points. The three-point support system includes a pair of support rods holding the tuning fork therebetween and at least one electrode terminal pin supporting the tuning fork at one end face thereof. A piezoelectric transducer element provided for at least one of the opposed tines of the tuning fork is electrically connected to the terminal pin by means of an electroconductive elastic deposit of a bonding agent. An electrically insulating and shock and vibration absorbing layer is provided between the bottom of the tuning fork and the end face of the terminal pin which is held in contact therewith.

Abstract: A seed sensor for sensing seeds flowing along a path is provided with an electromagnetic transducer having a movable diaphragm. An arm is secured to a generally peripheral portion of the diaphragm and extends into the seed flow path to be struck at random by the seeds. The arm has a portion operatively engageable with a mid portion of the diaphragm and functions as a mechanical amplifier to actuate the diaphragm when struck by the seeds for producing usable output signals.

Abstract: A diaphragm pump having a diaphragm which is movable to and fro by an oscillating arm which is in turn driven by an electromagnet has its oscillating arm so mounted that it oscillates in a plane which is perpendicular to the principal lines of force of the magnetic field produced by the electromagnet and parallel to pole faces of the electromagnet. Preferably the electromagnet has a core which is substantially E-shaped with the ends of the arms of the E forming the pole faces and the oscillating arm oscillates in a plane perpendicular to the plane of the E. The oscillating arm is preferably mounted by means of a leaf spring to enable it to oscillate and the leaf spring is fixed to a bearing block projecting from a base plate which also carries the electromagnet.

Abstract: A limited rotation motor has a stator and a rotor mounted for limited rotation relative to the stator. The stator is constructed to conduct bias flux through magnetic circuits that extend across air gaps between the stator and the rotor and a drive system produces drive flux which is conducted through magnetic circuits that extend across air gaps between the stator and rotor to drive the rotor. The stability of radial rotor position in its support bearings is enhanced by an imbalance in the bias flux magnetic circuits which continually produces a resultant radial force on the rotor so that a well defined radial position of the rotor is maintained over the range of limited rotation that the rotor moves in response to the drive system.

Abstract: One or more LEDs are connected across an induction coil wound on a tube slidably carrying an axially polarized permanent magnet, the tube being closed at both ends so that axial reciprocation of the tube causes the magnet to move back and forth through the coil and energize the LEDs.

Abstract: An apparatus for measuring the density of a fluid including a coil assembly comprising a housing of magnetic material having first and second circular end walls and a cylindrical permanent magnet disposed between and interconnecting said first and second end walls, said second end wall having means defining a centrally disposed circular aperture therein; a pole piece which extends from the first end wall and into the said aperture; and a coil which is mounted in the housing with the said pole piece extending axially therethrough, magnetic flux passing outwardly of the housing only through said aperture and being focussed by the latter.

Abstract: A method and a circuit arrangement for driving a two co-ordinate mechanical oscillator with the aid of a deformed rotating field of forces defined by a plurality of exciting and pick-up components. The power dissipation of the employed circuits is kept at a low level by operating the oscillator near the mechanical resonance frequency. The exciting signals are achieved by comparing phase shifted electrical signals derived from the mechanical motion of the oscillator in a first pick-up component with the undisplaced signals of the second directional component and by supplying the difference signal obtained therefrom to the second exciting components of the oscillator. This is continued to the next adjacent components until the ring is closed.

Abstract: An electric motor of the kind in which an oscillating element carries a magnet which is coupled magnetically to a rotor to transmit drive thereto. The electrical driving signals for the oscillating element, derived for example from a divided-down quartz crystal oscillator, have a frequency f which is f/2Q less than the natural resonant frequency of the oscillating element, where Q is the Q factor of the element, to maintain drive of the latter for all variations in natural frequency due to ambient changes.

Abstract: An electromechanical resonator is disclosed for use in optical scanning systems. The resonator comprises a torsionally resonant system including a torsion rod having one end fixed to a nodal zone member and an oscillatory mass at the free end. A flexurally resonant system includes a pair of oppositely disposed flexure arms extending transversely of the torsional axis and having their inner ends fixed to the nodal zone member. The nodal zone member is suspended by a coupling spring from a frame member and the coupling spring permits energy transfer from the flexurally resonant system to the torsional resonant system through nodal zone member. The resonant systems are maintained in oscillation by electrodynamic means coupled with the flexure arms.

Abstract: A mechanical filter device comprises a casing having housed therein a U-shaped tuning fork. A damper extends from the casing between adjoining vibratable tines of the tuning fork to effectively dampen abnormal vibrations of the tines caused by external shocks or impacts being applied to the casing. The damper is formed integrally with the casing as a one-piece structure from synthetic resin.

Abstract: An electrically driven tuning fork of the piezoelectric type, electromagnetic type or the like for use in electrical and electronic equipment which includes a tuning fork vibrator and electrical elements for driving the tuning fork vibrator. The two-pronged tuning fork vibrator has a pair of rectangular projections integrally formed with the prongs on corresponding side edges of the said prongs at one side of the tuning fork, excepting opposite end portions of the prongs adjacent to the node and in same embodiments, both the mode and antinode of the fundamental harmonic oscillation of the tuning fork for suppressing undesirable oscillation other than the fundamental harmonic oscillation of the tuning fork. Electrical elements are affixed onto the outer or inner surfaces of the prongs.

Abstract: The invention concerns an electromagnetic vibration-detector device, in particular for anti-theft, comprising a core which is displaceable in the interior of a winding, said core being secured to the free end of a vibrating blade which is rigidly secured at its other end, the device being characterized in that a thickness of cellular material is stuck on at least one of the faces of the blade, and the thickness of cellular material comprises on its free face a sheet of flexible material.

Abstract: A method for stabilizing the vibration frequency of an oscillator which contains a tuning fork-type quartz crystal element comprising a pair of arms each having a given size and a common connecting section connecting the mutually facing ends of the paired arms.

Abstract: An electromechanical reed filter has a pair of reed elements secured at one end to each other and supported on a base member. A electromechanical transducer is cemented to the side surface of each of the reed elements intermediate of the opposite ends of the reed. The reed filter is housed in a protective casing and is provided with a shock-absorbing member in the vicinity of the free ends of the reed elements. When an abnormal shock is applied to the filter the reed elements are caused to bend transversely and would strike the inner walls of the casing with the shock-absorbing member being interposed therebetween. The impact energy is effectively absorbed so that the cemented portion of the transducer is protected from deformation or cracks. The shock-absorbing member may be applied to the free ends of the reed elements so that spurious vibrations at frequencies higher than the fundamental frequency can be suppressed.

Abstract: This invention relates to an ordnance fuzing device in general and more picularly to a fluidically driven safety and arming mechanism. The present invention also utilizes a fluidically driven electrical generating means capable of transforming pressure energy of a certain magnitude into useable electric energy.The present device comprises an enclosed volume defining a resonant cavity having an annular column of fluid directed toward such cavity so as to produce oscillations therein. A rod connected to a diaphragm of the cavity senses the oscillations of the cavity and causes a mass located at the tip of the rod to undergo translational motion of an elliptical pattern and thereby to drive a cylindrical smooth gear which is disposed adjacent the mass, such that the elliptical motion of the mass rotates the gear. As an additional feature, the invention further provides for a flexible reed which is joined to the rod to transfer oscillations to a magnetic field so as to produce useable electrical energy.

Abstract: There is disclosed a light modulating structure including an open-ended housing within which an electromagnetically driven tuning fork structure is supported. The tuning fork is of composite construction including two L-shaped cross section elements and is manufactured by a method which involves shaping the tines portions of the elements to a desired thickness in a single machining operation before the elements are separated and joined together symmetrically at the toe of the L to form a composite tuning fork.