Abstract: A contact probe consisting of a tubular receptacle, a needle member received in the tubular receptacle in a freely slidable manner, 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, and a wire coil or a sleeve member securely wrapped around the part of the needle member which can be adjacent the rear end of the receptacle over the entire stroke of the needle member. The wire coil or the sleeve member effectively reinforces the part of the needle member placed adjacent the rear end of the receptacle against bending stress without substantially reducing the flexibility of the reinforced part of the needle member, and substantially improves the durability of the contact probe for the given material and dimensions of the contact probe.

Abstract: In a magneto-optical recording apparatus, a magnetic head is employed so as to perform vertical, or perpendicular magnetic recording. The magnetic head is constructed of a slider and a plurality of magnetic cores symmetrically positioned with respect to an axis of a magnetic recording medium. Each of the magnetic cores includes a main core, a return path core, and a gap.

Abstract: An electric contact probe, including a needle member made of electroconductive material having a pointed free end, a rod portion having a smaller diameter than the rod portion, and a head portion provided at another end of the stem portion; a tubular receptacle receiving a base end of the needle member therein in an axially slidable manner; a compression coil spring wrapped around the stem portion between an annular shoulder surface between the rod portion and the stem portion, and the head; an annular constricted part provided in the tubular receptacle to restrict axially inward movement of an axially inner end of the compression coil spring; and a small radially inward projection provided in the receptacle a small distance away from the constricted part toward the free end of the needle member to detachably engage an axially inner end portion of the compression coil spring.

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: An electric contact probe, including: a needle member made of electroconductive material having a pointed free end, a rod portion having a smaller diameter than the rod portion, and a head portion provided at another end of the stem portion; a tubular receptacle receiving a base end of the needle member therein in an axially slidable manner; a compression coil spring wrapped around the stem portion between an annular shoulder surface between the rod portion and the stem portion, and the head; an annular contricted part provided in the tubular receptacle to restrict axially inward movement of an axially inner end of the compression coil spring; and a small radially inward projection provided in the receptacle a small distance away from the constricted part toward the free end of the needle member to detachably engage an axially inner end portion of the compression oil spring.