Abstract: A contact force testing apparatus includes a measuring sensor that can be contacted with an electrical contact element and measures a contact force (F) of a contact with the electrical contact element of an electrical connector having a male component and a female component. The measuring sensor receives the contact force in a contact region with a piezoelectric pick-up. The measuring sensor includes a plurality of piezoelectric pick-ups that are spaced apart from one another by pick-up gaps. The measuring sensor has a protective sleeve that covers the piezoelectric pick-ups and the pick-up gaps in the contact region.

Abstract: An optical pickup device to provide a stable operation in both low-speed and high-speed modes by controlling a change in natural frequency, the optical pickup device including: a lens holder to support an objective lens; a supporting unit spaced apart from the lens holder; and a plurality of suspension members each having one end fixed to the lens holder and another end supported by the supporting unit to enable a movement of the lens holder, wherein the supporting unit includes a fixing member, a coupling portion provided in the fixing member to couple each suspension member, magnetic fluid received in the coupling portion, and an excite device to apply a magnetic field to the magnetic fluid.

Abstract: A rodent repellent device of random working frequency is disclosed, which comprises: an application-specific integrated circuit (ASIC); a deterring module, electrically connected to the ASIC, capable of emitting a wave emission selected from the group consisting of an ultrasonic wave, a seismic wave and a sound, being used for repelling rodents; and a power source, electrically connected to the ASIC, for providing power to the ASIC and the deterring module. Wherein the ASIC further comprises: an internal precision oscillator; a center processing unit (CPU); a wake-up module, being employed as an activation means for enabling the rodent repellent device to have randomized lasting time of wave emission and randomized intermission between two consecutive wave emissions; a read-only memory (ROM), for storing a program controlling the randomization of each intermission between two consecutive wave emissions and the lasting time of each wave emissions; and a random-access memory (RAM).

Abstract: A shock absorber used for absorbing shock energy generated by a vibrator positioned on a connecting plate is disclosed. The shock absorber has a column, a support plate and a cover plate. The column has an upper damper, a neck zone, a lower damper and a through hole. The neck zone is connected to the connecting plate. The cover plate is positioned above and covered the upper damper and the support plate is located below the lower damper for holding the column. A cylinder is connected to the support plate via the through hole so as to secure the column and the vibrator with the support plate. Furthermore, the neck zone has at least one groove to reduce a contacting area between the neck zone and the connecting plate so as to reduce a horizontal vibration frequency of the column in a horizontal direction.

Abstract: A CD-RW resonance removing apparatus comprises a first holding-down plate where at least the driving plate, the sliding rods and the read/write head are mounted; a second holding-down plate to balance the total weight of the first holding-down plate and other components mounted on it; multiple elastic pads attached to the first holding-down plate, called first elastic pads, for connecting the first holding-down plate to the chassis frame; and multiple elastic pads attached to the second holding-down plate, called second elastic pads, connect the second holding-down plate to the first holding-down plate. The first and second elastic pads could be with different K values and damping values. The balancing weight by the second holding-down plate, the absorbing vibration by the second elastic pads, and the isolating vibration function of the first elastic pads, all together, eliminate resonance during operation.

Abstract: An orientation inspector for LCD cell is utilized to inspect the LCD cell. The LCD cell includes two transparent substrates wherein the first transparent substrate is slightly bigger than the second transparent substrate and a step is formed on the first transparent substrate along the two side edges thereof. The orientation inspector for LCD cell comprises a main body connected to a hoister which can lower the main body to a predetermined position to stop the step at side edge of the LCD cell; a sensor disposed in the main body for detecting the step at side edge of the LCD cell below the main body, wherein when the body stops the step at side edge of the LCD cell and the sensor detects the step on the first transparent substrate, the sensor will confirm that the LCD cell is at correct orientation, and when the main body stops the side edge of the LCD cell and the sensor can not detect the step on the first transparent substrate, the sensor will confirm that the LCD cell is not at correct orientation.

Abstract: The invention is an intensified field focus moving coil phonocartridge assembly (10) including a rear magnet (32) and a front magnet (34) mounted in an axially juxtaposed manner within a support sleeve (38) so as to define therewith a magnetic field chamber (36). A signal coil subassembly (26) is suspended within the field chamber (36) and affixed to a cantilever (24) having a stylus (22) on its opposite end such that vibrations of the stylus (22) are physically translated to the signal coil subassembly (26). Electrical signals generated by the currents induced in the windings (29 and 30) of the signal coil subassembly (26) by induction caused by vibration within the field chamber (36) are carried to signal output pins (18) for electronic processing. The primary usage for the phonocartridge assembly (10) is in high quality stereo phonographic equipment for playing phonograph records.

Abstract: An improved pickup cartridge of the kind including two moving coils is disclosed which is constructed such that a cantilever including a stylus tip at its foremost end is inclinably held by means of a damping rubber fixedly fitted into a longitudinally extending hole in a cartridge case which is preferably divided into two case halves and a pair of coils are wound about the cantilever which are located opposite to one another relative to the damper rubber disposed therebetween. An assembly of a magnet and yokes is fixedly held in the cartridge case so as to generate two magnetic fields which are directed at a right angle relative to one another, one of them being located corresponding to one of the coils and the other one being located corresponding to the other coil. Preferably, an assembly including the cantilever, the coils and the damper rubber is fitted into a sleeve and the latter is inserted in the longitudinally extending hole in the cartridge case.

Abstract: Herein disclosed is a compact, highly reliable and inexpensive moving coil type cartridge comprising a ring-like magnet which is coaxially disposed with respect to a cantilever having a needle at its free end. A back-up first and a ring-like second auxiliary magnetic members are additionally provided at both sides of the ring magnet to attain the effective utilization of magnetic flux from the ring magnet.

Abstract: A stylus for stereo pickups tracking acoustic events mechanically recorded in grooves of a plate shaped record carrier comprises a soft iron tube which is adapted to embody a transducer and which has an open end into which a needle support tube is engaged and secured such as by adhesive connection. The needle is carried by the support with its axis substantially perpendicular to the axis of the support tube at the outward projecting end of the tube. The soft iron tube and the support tube are engaged in an opening of a support plate and embraced by a first elastic element engaged in the opening and elastically engaged with the soft iron tube. The construction includes a second elastic element engaged around a portion of the soft iron tube and the support tube at a location adjacent the open end of the soft iron tube and forms a damping body of a material of high internal friction.

Abstract: A pickup cartridge comprises a stylus arm having a stylus disposed at one end, and having the other end thereof flexibly supported in the cartridge. A flylead connects an electrode arranged on the stylus to a terminal mounted on the cartridge. In accordance with the instant invention, the stylus flylead is covered with a damping compound to improve the reliability of high speed scanning of the disc.

Abstract: In the vibration system of a pickup cartridge of a record player, the object of preliminarily applying a required deforming bias, in a direction opposite to the direction of the vertical tracking force, to the damper which deforms with the application of a vertical tracking force, and of releasing this deforming bias when the stylus is actually applied with a vertical tracking force, is achieved by arranging the cantilever-supporting tension wire which pulls the cantilever in the rearward direction, so as to pass through the damper at a position eccentric relative to the center of this damper which is disposed between the armature-carrying cantilever and the tension wire holder.

Abstract: In a moving-coil type pickup cartridge, a vibrating system including an armature wound with a coil is disposed at an open end area of a magnet with a damper being interposed between the armature and the magnet, and the armature is placed directly under the influence of magnetic flux produced between the one and other ends of the magnet for generating a voltage without using any yoke.

Abstract: An MC type phono cartridge which is simple in construction and easy to assemble and in which the stylus tip may be easily interchanged. The cartridge includes a pair of magnet units and an associated vibration unit. Included in the vibration unit is a cantilever with a stylus tip fixed to one end thereof with a disc-like member fixed to the other end of the cantilever. A string is attached at one end to the cantilever and at the other end to a string member holder which is in turn attached to the supporting member. A damper is disposed between a disc-like member and the supporting member. A pair of induction coils are disposed on the disc-like member. Each of the two magnet units includes a pair of adjacent magnets disposed with like magnetic poles confronting each other with the confronting portions of the magnets spaced from the induction coil at a preset gap. The vibration unit is detachable from the magnet unit for ease of stylus tip interchange.

Abstract: A signal pickup device in a rotary recording medium reproducing apparatus comprises a cantilever having at a free distal end thereof a reproducing element for reproducing recorded signals from tracks of a rotary recording medium, a permanent magnet magnetized in an axial direction of the cantilever and fixed to the cantilever at proximal end thereof, an elastic support member extending perpendicular to a longitudinal direction of said tracks and supporting the proximal end of the cantilever so that the cantilever is rotatable, accompanied by elastic deformation of the elastic support member, and tracking control coil device supplied with a tracking control current to attract and repulse the permanent magnet to cause the cantilever to rotate. The reproducing element is displaced in a direction perpendicular to the longitudinal direction of the recording tracks of the rotary recording medium to tracks.

Abstract: An electromagnetic pickup cartridge in which a cantilever with a stylus tip at the free end thereof is extended perpendicularly from the center of one major surface of an armature which is partially embedded in a holder which is made of a high molecular weight compound, which serves as a suspension part and in turn is mounted through a damper in a sleeve. Since the armature is not needed to be formed with a center aperture, the fabrication cost can be reduced.

Abstract: In a pickup cartridge of the moving magnet type, the components of movement of a cantilever in the vertical and horizontal directions are individually detected to produce two kinds of electromotive forces respectively proportional to the velocity of the detected vertical and horizontal components of movement. The sum and difference signals of the two kinds of electromotive forces are separately obtained for stereophonic reproduction of signals recorded on a recorded disk. The vibration system is given different vibration characteristics for vertical movements thereof than those for horizontal movements thereof, without sacrificing electrical output characteristics such as channel separation characteristic and low frequency response characteristic.

Abstract: A pick-up phono cartridge in which the position of an armature disposed at a base end of a cantilever is made adjustable to thereby produce a desired output voltage. A vibrating system of the cartridge includes an armature secured to a base end of a cantilever having a stylus secured to the other end thereof. A center axis of the cantilever is vibratable around a predetermined position on the armature. A fixed system is provided including at least a front yoke and a rear yoke which are positioned to nearly clamp the armature. The vibrating system is made adjustable in the axial direction of the cantilever upon loosening a stop screw.

Abstract: In order to improve the performance of a stereo phonograph cartridge which includes a base, first and second piezoelectric transducers, first and second individual elastomeric blocks mounting the first and second transducers to the base depending downwardly in a cantilevered manner in horizontal spaced relationship, first and second separate elastomeric stabilizers mounted to the base in horizontal spaced relationship with each other and directly below the first and second transducers, a resolver having four connecting points contacting respectively to the first and second transducers and the first and second stabilizers, a pivot anchor coupling the resolver in a tensioned manner to the base, the pivot anchor being attached to the resolver at a point which is equidistant from each of the four connecting points, and a stylus bar extending from the resolver along the axis of the pivot anchor, the stylus diameter is reduced to thereby reduce stylus mass, the size of the resolver and stabilizers is reduced to per

Abstract: A moving coil type pickup cartridge comprises at least two movement-electromagnetism conversion systems functioning in push-pull mode, each system being arranged by a coil supported on a plate and inserted in an air gap between two opposing magnet blocks each constituted by side-to-side two magnets so as to provide opposite magnetic poles facing each other with the air gap intervening therebetween. A linear movement of the coil is allowed in the air gap in the directions of cutting the magnetic fluxes in the magnetic fields produced between the opposing magnet blocks. This arrangement provides a high density of magnetic fluxes and a high output voltage and improves the quality of signals reproduced. This effect is promoted further by yoke plates of a material of high magnetic permeability arranged to straddle the open magnet poles of the side-to-side magnets, thereby inhibiting leak of magnetic fluxes from these open poles.

Abstract: A moving coil type stereophonic pickup cartridge is disclosed wherein a pair of magnetic air gaps are established corresponding to the walls of the sound groove of a 45.degree.-45.degree. stereophonic record and arranged such that the orientation of magnetic flux in the air gaps projects orthogonally to each other. The two magnetic air gaps are arranged on the right and the left of a cantilever fulcrum respectively. A coil is arranged within each of the gaps, each coil having a winding axis generally parallel to the axis direction of the cantilever. Each coil moves within its associated magnetic air gap integrally with the cantilever, thereby developing high output signals.

Abstract: A pick-up assembly carried by a tone arm itself or a cartridge adapted to be connected to the tone arm includes a vibrating section and a magnetic circuit section. The vibrating section has a cantilever having one end carrying a stylus and the other end mounted in a support ring. A pair of ring-shaped moving coils are mounted on the support ring in such a manner that the longitudinal axes of the coils are in parallel and equidistantly spaced relation to the longitudinal axis of the support ring so that the coils are angularly spaced at right angles to each other about the longitudinal axis of the support ring. The magnetic circuit section has a permanent magnet sandwiched between front and rear yokes of magnetic material.