Abstract: A moving coil type pick up capsule having a body, cantilever having first and second ends, a stylus located at its first end and a coil located at its second end and, therebetween, a dampener having an opening therethrough. The cantilever passes through the dampener opening such that the stylus is on a first side of the dampener and the coil is on a second side of the dampener. First and second magnets or yokes are positioned within or proximate the capsule body and spaced from one another to create a gap, the dampener and coil being positioned within the gap such that the fulcrum is located between the stylus and coil and specifically at the dampener. A dampening fluid fills the gap to complete the assembly.

Abstract: This invention aims at reducing a rolling moment generated in coils mounted to lens holder side face without losing drive forces in a focusing direction and tracking direction in an objective lens drive of an optical pickup device. By shifting a coil line portion near the objective lens of two coil line portions substantially parallel to the tracking direction of the first coil in a direction departing from a lens optical axis, increase and decrease in drive forces generated in right and left first coils when the lens holder is moved in the tracking direction cancel each other so as to eliminate imbalance between the right and left drive forces.

Abstract: A lens driving apparatus 1 of the present invention includes a substantially cylindrical yoke 3; a base 5 to which the yoke 3 is attached; a carrier 7 having a lens; a coil 10; and a magnet 13, wherein the carrier 7 is moved in a direction of an optical axis of a lens by electromagnetic force generated by passing current through the coil 10, the base 5 is substantially square-shaped as viewed from a plane, the yoke 3 is placed at an inner position of the base 5, the yoke 3 has an outer peripheral wall 3a and an annular inner peripheral wall 3b to be spaced to each other, each magnet is placed between the outer peripheral wall and the inner peripheral wall and at a position corresponding to a base corner portion of the base 5, and a space between the outer peripheral wall 3a and the inner peripheral wall 3b positioned at a base side portion 3e is made narrower than a space between the outer peripheral wall 3a and the inner peripheral wall 3b positioned at the base corner portion.

Abstract: A moving coil linear motor positioning stage with a concentric aperture is disclosed. The present invention relates to positioning an element or device such as an optic or lens. The apparatus is ideal for moving an optic coaxial with a light beam. The present invention uses a voice coil motor with a cylindrical moving coil and a cylindrical permanent magnet assembly with a radial gap. The moving coil and magnet assemblies have clear apertures concentric with the apparatus and the axis of motion. A pair of planar flexures guides the moving coil. A position-sensing device is used to sense the position of the moving coil to enable fine position control.

Abstract: A photosensitive recording material for recording information by means of a local change in the optical properties of a recording layer under the action of light having a high energy density, and a process for its preparation.

Abstract: In a stereo pick-up having movable coils (14) and an SmCo magnet (22) with a high energy content, with the coil system (14, 15, 18) arranged in front of one pole face of said magnet, a yoke plate (23) of a magnetic soft material is arranged in front of said system to increase the magnetic induction in the coils. The great coercive force of the magnet is utilized for simplifying and reducing the costs of the mechanical structure in that the yoke plate is formed with two legs (26) which extend rearwardly, engage and are secured to two opposite sides of the magnet. The short-circuit of the magnet established by these legs has no noticeable impact on the induction in the air gap because of the high coercive force of the magnet.

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: A pickup cartridge of the moving coil type including a magnetic circuit having, in series, (a) an armature with which the coil is associated, (b) a rear yoke, (c) a magnet, and (d) a front yoke. The improvement constitutes grounding magnetic circuit at a point substantially removed from the armature in the series magnetic circuit, the grounding point being at least as far removed from the armature as the surface of the front yoke. Preferably the grounding point is on the end of the front yoke farthest from the armature.

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 coil assembly comprises a plurality of conductive spiral pattern layers which are piled up via (an) insulating layer(s) on a wafer. The electrical connection between the spiral patterns is established by means of a conductive member, which is a portion of the upper spiral pattern layer, filled in a through-hole which is made in the insulating layer so that the spiral patterns are connected in series to develop a high voltage when the coil assembly is moved in a magnetic field.

Abstract: A phonograph pick-up or cutter has a stylus holder carrying a stylus, which cooperates with two transducers, one for each of two orthogonal directions of vibration. Each transducer has a flat coil and an associated magnet having their axes in line. For each transducer the direction of relative movement of the coil to the magnet corresponds to the direction of the coil axis and the magnetic axis. The stylus holder is connected to the moving parts of the two transducers by a coupling member. Preferably, the moving part is arranged on a support connected to the stationary part, to minimize undesired transverse movements.

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: 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 ends of the magnet for generating a voltage without using any yoke. The magnet is a hollow cylinder having its interior free of any other magnet material.

Abstract: Moving coils of a phonograph pickup are made of a substance having magnetoresistance so that the electrical resistance of the coils are detected by means of bridge circuits. The amounts of resistance variation of the coils are used to produce a vertical component output signal and a horizontal component output signal which respectively indicate the vertical and horizontal displacements of the coils from its optimum operating point with respect to the magnetic field of the pickup. The vertical and horizontal component output signals are used to control vertical and horizontal control motors which correct the attitude of the tone arm so that the moving coils are accurately positioned at the optimum operating point irrespective of the warp and/or eccentricity of the phonograph disk.

Abstract: An electrodynamic pickup cartridge comprises two reproduction channels (1 and 2). Each channel (1 and 2) is provided with a cylindrical coil (3 and 4) representing a single-section structure and so disposed relative to its magnet (5 and 6) that it encompasses both poles (N and S) of said magnet and longitudinal axis thereof is perpendicular to the axis of said magnet (5 and 6) along the N-S line. The magnets (5 and 6) are installed on a stylus holder (7) which is common to both channels (1 and 2) and carries a stylus (8) so that unlike poles (N and S) thereof project on both sides of the stylus holder (7), while their axes (9 and 10) along the N-S line are found in planes crossing at a standard recording angle (.alpha.).

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: In a moving coil type stereophonic pickup cartridge, an armature is provided having first, second, and third leg portions which extend in three directions. A source of magnetic flux is disposed with only one pole thereof adjacent to the first, second and third leg portions of the armature. The magnetic circuits thus constructed, having an open return path, generate signals by changes in the magnetic flux through coils wound on the second and third leg portions due to the movement of the armature relative to the magnetic source. Variations in the design of the three leg armature and the magnetic source are disclosed. Practical embodiments of the invention include disclosure of cartridge replacement features providing convenient electrical connection between moving coils and remainder of the sound reproduction system.

Abstract: A moving-coil type stereo pickup cartridge comprises a vibration mechanism, including a stylus for tracing the groove of a sound track on a record disc, at least one coil plate provided in the vibration system and adapted to vibrate in response to vibrations of the stylus, and a structure for forming a magnetic field for the coil plate. The coil plate comprises a thin insulative substrate and a pair of left and right coils substantially symmetric with respect to a center line and formed by an electrically conductive thin film placed in a spirally wound pattern on at least one surface of the substrate. The magnetic field-forming construction comprises a permanent magnet and a pair of yokes adapted to clamp the permanent magnet. The pair of yokes have confronting surfaces for defining a gap in which the coil plate is interposed and a recessed substantially reverse V-shaped notch or cutout. The notch is defined by edge parts or facets.

Abstract: A phonograph pickup cartridge of moving coil type comprises a cartridge body and a stylus assembly detachably mounted on the body. The body includes a housing which firmly holds a permanent magnet and a pair of pole pieces. Magnetic gaps are defined between the pair of pole pieces in the region of the lower opening of housing. The housing carries a plurality of electrical terminal pins, which have their one end projecting externally from the rear end of the housing and which have their other end projecting through the bottom of the housing. The stylus assembly includes a knob member which supports a stylus subassembly having an armature which carries a pair of coils, and which also supports a plurality of electrical connectors which are adapted to be detachably coupled with the terminal pins. The ends of the coils are electrically connected with the connectors.

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 a moving coil pickup cartridge of a stereophonic type having a magnetic circuit consisting of a permanent magnet, a plate and a yoke, left and right air gaps formed in the magnetic circuit, and left and right pickup coils disposed in the air gaps, respectively, the cartridge including left and right pole pieces formed in the magnetic circuit for providing cone-shape magnetic fluxes on each of the air gaps so as to cross the left and right pickup coils. respectively. Stylus exchanging mechanism is also disclosed.

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 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.

Abstract: A moving-coil type pickup cartridge comprises a vibration system including a stylus for tracing a sound groove of a record disc, at least one coil plate adapted to vibrate in response to vibration of the stylus of the vibration system, and an arrangement for producing magnetic fields with respect to the coil plate. The coil plate has at least one coil formed by thin film in a spirally-shaped pattern. The magnetic field producing arrangement has at least one permanent magnet for producing magnetic fields wherein are produced magnetic fluxes of mutually opposite directions respectively in regions of the coil resulting from substantially halving of the coil in the vibration direction thereof.

Abstract: At least one spiraled semi-circular shaped coil is printed on each surface of a wafer. The coil on a first surface of the wafer is arranged in such a manner that it is rotated 90 degrees with respect to the coil on a second surface thereof. In one embodiment, two such printed coils are symmetrically provided on each surface of the wafer, and the pattern of the printed coils on the first surface is arranged to be rotated 90 degrees with respect to the pattern of the printed coils on the second surface thereof. The spiraling directions of the coils on the same surface are inverse or opposite each other. The inner terminals of the coils on each surface are connected and an output is taken out from the outer terminals thereof, or vice versa. A printed coil is employed, for example, in a moving coil type pick-up cartridge.

Abstract: A lens driving apparatus 1 of the present invention includes a substantially cylindrical yoke 3; a base 5 to which the yoke 3 is attached; a carrier 7 having a lens; a coil 10; and a magnet 13, wherein the carrier 7 is moved in a direction of an optical axis of a lens by electromagnetic force generated by passing current through the coil 10, the base 5 is substantially square-shaped as viewed from a plane, the yoke 3 is placed at an inner position of the base 5, the yoke 3 has an outer peripheral wall 3a and an annular inner peripheral wall 3b to be spaced to each other, each magnet is placed between the outer peripheral wall and the inner peripheral wall and at a position corresponding to a base corner portion of the base 5, and a space between the outer peripheral wall 3a and the inner peripheral wall 3b positioned at a base side portion 3e is made narrower than a space between the outer peripheral wall 3a and the inner peripheral wall 3b positioned at the base corner portion.

Abstract: A lens driving apparatus 1 of the present invention includes a substantially cylindrical yoke 3; a base 5 to which the yoke 3 is attached; a carrier 7 having a lens; a coil 10; and a magnet 13, wherein the carrier 7 is moved in a direction of an optical axis of a lens by electromagnetic force generated by passing current through the coil 10, the base 5 is substantially square-shaped as viewed from a plane, the yoke 3 is placed at an inner position of the base 5, the yoke 3 has an outer peripheral wall 3a and an annular inner peripheral wall 3b to be spaced to each other, each magnet is placed between the outer peripheral wall and the inner peripheral wall and at a position corresponding to a base corner portion of the base 5, and a space between the outer peripheral wall 3a and the inner peripheral wall 3b positioned at a base side portion 3e is made narrower than a space between the outer peripheral wall 3a and the inner peripheral wall 3b positioned at the base corner portion.

Abstract: A lens driving apparatus 1 of the present invention includes a substantially cylindrical yoke 3; a base 5 to which the yoke 3 is attached; a carrier 7 having a lens; a coil 10; and a magnet 13, wherein the carrier 7 is moved in a direction of an optical axis of a lens by electromagnetic force generated by passing current through the coil 10, the base 5 is substantially square-shaped as viewed from a plane, the yoke 3 is placed at an inner position of the base 5, the yoke 3 has an outer peripheral wall 3a and an annular inner peripheral wall 3b to be spaced to each other, each magnet is placed between the outer peripheral wall and the inner peripheral wall and at a position corresponding to a base corner portion of the base 5, and a space between the outer peripheral wall 3a and the inner peripheral wall 3b positioned at a base side portion 3e is made narrower than a space between the outer peripheral wall 3a and the inner peripheral wall 3b positioned at the base corner portion.