Abstract: In an electroconductive contact unit, a base end of a compression coil spring which may be either a contact member itself or a spring member for urging a needle-shaped contact member is received in a support recess formed in a base board. An end of the internal conductor of the base board is exposed on the bottom end of the support recess, and is electrically connected to the base end of the compression coil spring. There is no need for any electric connector, and the electric resistance between the internal conductor of the base board and the contact member can be minimized. To ensure a favorable electric connection, a base end of the compression coil spring may be soldered to the exposed end of the internal conductor which may be either flat or recessed.

Abstract: A magnetic head device in which one end of a load beam is bent to form a stepped portion, and a vertical bent surface and a pivot are integrally formed. The vertical bent surface provides a load beam height with respect to the head body 1. A fulcrum, the top portion of the pivot, and virtually the center of a head body are lined up in a straight line in the vertical direction, so that the floating force acting on the head body acts vertically on the fulcrum, so that a moment is not produced. Therefore, the floating posture of the head body becomes stable.

Abstract: A magnetic head device in which one end of a load beam is bent to form a stepped portion, and a vertical bent surface and a pivot are integrally formed. The vertical bent surface provides a load beam height with respect to the head body 1. A fulcrum, the top portion of the pivot, and virtually the center of a head body are lined up in a straight line in the vertical direction, so that the floating force acting on the head body acts vertically on the fulcrum, so that a moment is not produced. Therefore, the floating posture of the head body becomes stable.

Abstract: In an electroconductive contact unit including an electroconductive coil member received in an axial bore with the axial ends of the coil member projecting from the axial bore so as to serve as contact pin sections, the contact pin sections are formed by closely wound segments of the coil member while the middle part of the coil member is formed as a compression coil spring section for biasing the contact pin sections. The compression coil spring section includes a coarsely wound segment and a normally wound segment. When in use, the adjacent turns of the coil wire of at least the normally wound segment of the coil member are brought into contact with each other so that the coil member is made electrically equivalent to a cylinder in most part, and can thereby minimize its electric inductance and electric resistance.

Abstract: A supporting structure of a magnetic head device in which small holes of the same size are formed so as to be distributed in a resiliently deformable portion in order to reduce the spring constant thereof and make the resiliently deformable portion less susceptible to torsional resonance. In particular, when the holes are formed at equal intervals in a direction parallel to diagonals drawn across the resilently deformable portion so that the holes are not formed on the diagonals, a structure less susceptible to torsional resonance can be provided.

Abstract: A flexure (2) has hook-shaped restricting pieces (18, 18), while a load beam (3) opposed to the restricting pieces (18, 18) is provided with an insert piece (11). When the flexure (2) and the load beam (3) are secured, the insert piece (11) of the load beam (3) is inserted in the restricting pieces (18, 18), so that the vertical shift of the flexure (2) is limited to within the height (H) of the restricting pieces (18). Hence, even if the magnetic head device is subjected to a strong impact, the flexure (2) does not shift in excess of the height (H), thus permitting improved shock resistance of the flexure (2).

Abstract: In a magnetic head device, I-shaped side and center cores are fitted to a slider, and magnetic gaps are formed by a part of the slider. Therefore, a magnetic path can be shortened, and the magnetic head device is constructed so as not to leave strains on the cores, so that the core loss is low. In addition, a back core (back plate) having a wide area is provided, so that heat-dissipating effect is enhanced. Therefore, magnetic field-generating efficiency can be improved in wide frequency bands. Further, by decreasing the number of turns of a coil, the inductance, the impedance, and the loss factor can be reduced.

Abstract: In an electroconductive contact unit including a pair of needle members projecting from either end of a holder arrangement, and an electroconductive compression coil spring interposed therebetween for resiliently urging the needle members away from each other, the compression coil spring comprises a normally wound segment and a coarsely wound segment. When the contact unit is applied to an object to be contacted, the adjacent turns of the coil wire of the normally wound segment are brought into contact with each other so that the electric path between the needle members is substantially straight along the length of the coil spring with the coarsely wound segment.

Abstract: In a magnetic head device, I-shaped side and center cores are fitted to a slider, and magnetic gaps are formed by a part of the slider. Therefore, a magnetic path can be shortened, and the magnetic head device is constructed so as not to leave strains on the cores, so that the core loss is low. In addition, a back core (back plate) having a wide area is provided, so that heat-dissipating effect is enhanced. Therefore, magnetic field-generating efficiency can be improved in wide frequency bands. Further, by decreasing the number of turns of a coil, the inductance, the impedance, and the loss factor can be reduced.

Abstract: Provided is a contact probe unit for establishing an electric contact between parts to be contacted and terminals of an external circuit. A plurality of needle members are slidably received individually in support holes provided in a support block. A resilient block is placed over the upper surface of the support block, and the needle members can be thereby engaged to the parts to be contacted with a suitable spring force. The electric contact between the upper ends of the needle members and the terminals of the external circuit may be achieved either directly or via a pressure sensitive electroconductive resilient block. The use of resiliently supported needle members ensures a high reliability and a high durability. Furthermore, a high dimensional precision on the pitch of the front ends of the needle members can be achieved without any difficulty.

Abstract: An electronic device is interposed between a pair of contact units of a contact probe unit without using any soldering or other permanent connecting arrangement. Alternatively, the electronic device is interposed between a securing plate and a contact unit provided with a pair of arrays of contact modules. Thus, the electronic device may be incorporated in the contact probe unit without requiring any permanent connecting arrangement such as soldering which may produce any contaminants or other undesirable substances or cannot be readily detached and attached. This is particularly important in a clean room environment. According to a preferred embodiment of the present invention, said electronic device comprises an integrated circuit mounted on said sheet member. For instance, the electronic device may consist of a TAB for driving an LCD panel so that the LCD panel may be tested in a realistic condition.

Abstract: In a magnetic head apparatus that generates a strong magnetic field of magneto-optical recording or the like, a joint assembly of main and side cores is fitted into an accommodating groove formed in a ceramic slider, and a bobbin having a coil wound around it is fitted onto the main core. Further, a back core is fastened to the main and side coils. An electrical insulating layer extending along the dimension of the magnetic path is formed in the main core to divide conductive region by the sections of the main core. Thus, the eddy current generated along a dimension perpendicular to the magnetic path is suppressed, whereby the core loss is mitigated and the quantity of heat generated in the core is reduced.

Abstract: In a contact probe having a pair of needle members elastically projecting from two ends thereof for temporarily connecting two points by contacting them with the two needle members, a coil spring interposed between the needle member consists of material having a low electric resistance, and is securely connected to the rear ends of the associated needle members at its two ends by soldering, brazing, welding, or wire-wrapping to establish an electroconductive path between the two needle members. Thus, the two needle members are substantially directly connected with each other via the compression coil spring serving as an electric conductor, and the electric resistance between them can be kept low and stable. The elimination of a separate conductor to be connected between the two needle members allows the diameter and the length of the contact probe to be reduced.

Abstract: In a contact probe, the conventional tubular holder for receiving the needle member and the compression coil spring is eliminated by receiving them in a through hole provided in an insulator assembly consisting of at least two layers of insulating plate members. By thus eliminating the need for a tubular holder, the effective outer diameter of the contact probe can be reduced, and the density of contact probes in a contact probe assembly including a multiplicity of such contact probes in a parallel relationship can be increased without reducing the spring force of the coil spring or the mechanical strength of the needle member of each contact probe.

Abstract: A contact probe unit includes a plurality of contact probes secured to a receptacle holder plate member, and a free end guide plate member provided with a plurality of guide holes for slidably receiving the needle members, at a density higher than that of the contact probes at the receptacle holder plate member, and at least one intermediate guide plate member disposed between the free end guide plate member and the receptacle holder plate member so as to allow an axial movement to the needle members and provide a lateral support to the needle members. Thereby, each of the needle members can be favorably guided for axial movement between the receptacle holder plate member and the free end guide plate member so as to eliminate the possibility of two adjacent needle member touching each other in the region between the receptacle holder plate member and the free end guide plate member, and improve the durability of the needle members.

Abstract: A floating magnetic head of the type in which a slider is joined to the free end of a magnetic head support device includes wings provided in the free end section of the magnetic head support device and engaged with notches provided in slider sections excluding the ABS surface thereof, thereby providing a high level of resistance to impacts and vibrations.

Abstract: A contact probe, comprising: an electroconductive needle member; a tubular holder slidable receiving the needle member; a compression coil spring fitted on the needle member in the tubular holder to urge the needle member so as to project a forward end of the needle member from one end of the tubular holder; a stopper arrangement for restricting the extent to which the forward end of the needle member projects from the one end of the tubular holder; and a lead wire preferably continuous and integral with the needle member for electrically connecting the needle member to an external circuit. Owing to the use of the compression coil spring which may extend substantially the entire length of the contact probe, a favorable spring property can be obtained. The use of the compression coil spring surrounding the needle member permits generation of a large spring force, and the outer diameter of the contact probe is not required to be increased.

Abstract: A magnetic head for a magneto-optical recording device for magnetically recording information onto a magnetic recording medium under the condition where the magnetic recording medium is heated by irradiation of a laser beam. A leakage magnetic field is effectively suppressed by a skin effect, and a magnetic field due to an eddy current is effectively summed up with a magnetic field generated from the core end, thereby increasing an intensity of a total magnetic field to be applied to the magnetic recording medium. Further, a distribution of the magnetic field intensity at the core end can be easily adjusted to stably and widely apply the magnetic field to the magnetic recording medium.

Abstract: A magnetic head for photo-magnetic recording wherein an adaptor is attached to the distal end of a load beam, and a slider is joined to the adaptor via a flexure. A flat portion of the adaptor to which is attached the flexure is inclined at a given angle in the radial direction of a photo-magnetic disk, or the flat portion of the adaptor and a tongue of the flexure are inclined at respective given angles in the rotational direction of the photo-magnetic disk. The sliding mounting height is set optionally, a static attitude of the slider is held horizontally and stably, and the head is reduced in size and weight to permit high-speed access.

Abstract: A contact probe consisting of a tubular receptacle, a needle member received in the tubular receptacle in a freely slidable manner, and a compression coil spring coiled around the needle member, and compressed between a shoulder surface defined in the receptacle and another shoulder surface defined in the needle member to urge the needle member out of the front end of the tubular receptacle. The compression coil spring is provided with a large diameter portion at its inner end for elastically engaging with an inner surface of the receptacle so that the needle member may be replaced without requiring the receptacle to be removed.