Abstract: A ceramic-ferrite head for use with a flexible data-storage disk comprises a cylindrical body composed of magnetically soft ferrite and formed internally with a cup-shaped recess open at one end and a boss provided with a window at the opposite end. The core assembly is received in this boss and is bonded therein with a glass-resin composition while the coils of the assembly are found in the recess and are connected, together with the ground lead through a cap of the same material as the body, to a printed circuit board on the opposite side of this cap. The recess is lined with a conductive coating which is likewise grounded to the printed circuit board by the ground conductor.

Abstract: A composite head structure having a front core consisting of a non-magnetic spacing device for separating a read-write magnetic flux path from an erase magnetic flu path and first and second core chips adhered together with the spacing device interposed between them. A read/write gap is formed at the central portion of the first core chip which is parallel to the longitudinal direction of the spacing device and whose width is defined by first and second notches which extend from respective side edges of the first core chip. Erase gaps are formed in the second core chip which extend between the side edges of the second core chip parallel to the longitudinal direction of the spacing device and whose widths are defined by a third notch formed at a position substantially corresponding to the read/write gap as viewed along the direction of the arrangement of the first and second core chips.

Abstract: A magnetic erase head for a tape player comprises a head tip portion and a back core portion. The head tip portion consists of a W-shaped tip, which is constructed of a center tip and a pair of side tips connected via spacers to the center tip, and a dummy tip, which is constructed of a tip member and a separator received in a recess made in the tip member. The back core portion consists of a center core equipped with a winding, and an L-shaped core connected to the center core at its rear portion. A recess in the front portion of the L-shaped core receives the front portion of the center core. The L-shaped core has two tapered arms defining the recess. Nonmagnetic blocks may be provided for reinforcing the arms. The dummy tip may be made of a nonmagnetic material if desired. With this arrangement a magnetic erase head having a narrow tip and a high erasure ratio is provided.

Abstract: A magnetic head assembly is disclosed comprising a housing having a front surface including a slot formed therein and extending through the housing; a read/write transducer positioned within the slot and including a read/write gap of predetermined dimensions substantially in the plane of the front surface, the lengthwise extent of the read/write gap being skewed with respect to a first axis running perpendicular to a second, principal axis of the housing; and a pair of erase transducers positioned within the slot on either side of the read/write transducer, each erase transducer including an erase gap of predetermined dimensions substantially in the plane of the front surface, each erase gap being positioned on the opposite side of the first axis from the read/write gap.

Abstract: A terminal has a reciprocating print head bearing a series of linearly arranged, individually-magnetizable styli for printing on magnetic particle oriented paper. The terminal may be used as a printer, or as a display by combining the printer with an erasing head comprising a series of linearly arranged magnets which create a rotating magnetic field to erase the magnetic particle oriented paper when the erasing head is reciprocated. The print and erase heads are mounted on a common carriage. The terminal is cheap to manufacture and, if used as a printer, has the advantage of reusable paper. If used as a display, it required no refresh.

Abstract: A magnetic erasing head for use in a radio receiver/tape recorder combination, includes a housing, a core unit of ferrite and an electrical winding. The housing has an opening which leaves a surface of the core unit free for cooperation with a record carrier to be erased. In order to control the generation of higher harmonics of the erasing frequency which might interfere in particular with radio reception on the medium wave range, the core unit is constructed with an entirely open rear circuit. In other words, the usual closing part is absent.

Abstract: A device for erasing visible recorded signals from a recording medium such as an elongated tape, sheet or web having oriented magnetic components. The carriage carries one or a plurality of rotatable magnets which rotate in a plane parallel to the recording medium. The magnets may be supported by pulleys on which is entrained an endless belt. The pulleys may be operatively coupled by a gear train to a rack gear on a frame so that the magnets rotate when the pulleys are driven and the carriage is moved along the frame. Alternatively, the pulleys may be coupled to a motor which drives the magnets. Spaced or contiguous paths are traversed by magnetic fields maintained by the rotating magnets. The recording medium may be drawn underneath the carriage which is stationary, or the recording medium may be stationary and the carriage moved along the recording medium, or the recording medium and carriage may be moved simultaneously.

Abstract: A magnetic head assembly for reading and/or writing a track of magnetic information on a moving magnetic medium and for erasing edge portions of the track. The head assembly comprises a central data transfer magnetic core including a pair of core portions providing a data transfer gap on an active face of the head assembly with a read/write coil on one of the core portions. The head assembly comprises also an erase core which includes a pair of erase core portions extending along and in contact with one of the write core portions, another pair of erase core portions respectively in alignment with the first named erase core portions and providing therewith erase gaps on the active face of the head assembly that extend transversely of the direction of movement of the magnetic medium on the active face and a core portion on which an erase coil is disposed bridging and between the last two mentioned erase core portions.

Abstract: A magnetic erasing head including a rear part on which an exciting coil is wound, side parts extended from the rear part, a front part on which two or more gaps are formed with each spacer made of a non-magnetic substance. An angle of one of the gaps is different from an angle of the other gap.

Abstract: A magnetic head for a tape player comprises a head tip having a recess and a center tip interposed in the recess via spacers, and a back core having an L-shaped core and a center core. The L-shaped core has a like recess and the front end of the center core is interposed in the recess of the L-shaped core without coming into contact with the L-shaped core, while the other ends of the L-shaped core and the center core are connected to each other. A winding is provided around the center core, while the head tip is fixedly attached to the front surface of the back core so as to constitute a magnetic circuit, thereby providing a narrow head tip width erase head, while erasure efficiency is maintained high.

Abstract: A magnetic erasing head in which a single rear core has a plurality of integrally formed legs. A front core is provided with a plurality of core pieces bonded to each other to form paired units, each unit having an erasing gap formed between adjacent core pieces a coil is adapted to surround one leg of the rear core and supplied with erasing current. The rear end surface of the core pieces of the front core are bonded to corresponding end surfaces of the legs of the rear core.

Abstract: An erasing head is improved with respect to its erasing ratio as well as its distortion ratio. The erasing head has at least two gap portions one of which is so designed as to apply a high erasing magnetic field sufficient to completely erase information recorded on the tape. The other gap portion is so designed as to apply a magnetic field just intense enough to minimize the distortion ratio.

Abstract: An AC magnetic erase head having improved AC erase characteristics, the magnetic head being formed of two half core elements of a magnetic material, preferably ferrite, defining an irregular edged or jagged-edged gap, and including a non-magnetic substance, preferably glass, within the gap. The magnetic head is preferably produced by thermally etching ferrite magnetic material forming the half core elements by means of relatively prolonged heat soak at an elevated temperature.

Abstract: An erase head for erasing single tracks on multi-track magnetic recording tapes by means of a constant magnetic field applied in a direction perpendicular to the direction of tape travel, to avoid any asymmetrical residual magnetization with respect to the direction of a magnetizing field used for recording. A configuration of two pole pieces and two corresponding shields, spaced out from the pole pieces and generally coplanar with the end faces thereof, ensures that the magnetic field strength is relatively uniform in a region between the shields, and falls to a relatively low value outside this region.

Abstract: In a magnetic erasing head having a first gap and a second gap formed respectively between ferrite cores, one or more magnetic material layers (Fe-layers) are arranged in the gaps respectively, and the magnetic material layers have the magnetic flux density (B.sub.10) of more than 5000 gauss, the permeability of more than 5000 and the thickness of 5.mu. to 30.mu..

Abstract: A magnetic head assembly includes read/write pole elements having tip structure flush with slide surfaces on separate mounts, the latter mounting erase poles having ends at opposite sides of the read/write pole tip structure. Separate coils may be located about the erase poles; and notches may be located in the mounts at opposite sides of the read/write pole elements to provide a controlled throat dimension.

Abstract: A track servoing system is disclosed which is particularly useful with floppy disk memories. The system improves the positioning accuracy of a read/write head during a reading operation through the use of tunnel erase heads as read heads. The tunnel erase heads are positioned on either side of the read/write head and their outputs are differentially measured to provide direction and magnitude information to servo positioning electronics. The invention is particularly reliable in reading eccentric variations in data tracks caused by environment, i.e., humidity, temperature, etc.

Abstract: In methods of making head assemblies, a ceramic slider having a row of receiving apertures is united with a multiple serial ferrite arch structure shaped in complementary fashion so that successive arches thereof register within the apertures to define erase pole pieces. The face of the resulting assembly is ground flat and parallel to the arch base and the bridges thus formed on the base side may be separated between the arches. The assembly is then bisected along the row of pole pieces into complementary halves, and the facing surfaces are ground and lapped to provide a desired width for the erase member formed by the pole piece half and associated leg of one of the ferrite arches. Grooves are cut into the bisected surfaces at the pole pieces to define the erase track width and the erase gap length for the erase member.

Abstract: Alternate S- and N-poles are disposed on a multipolar erasing head in the direction of a relative movement of the multipolar erasing head to a magnetic recording medium. The multipolar erasing head includes at least one region where the distances between adjacent magnetic poles of the same polarity are successively shortened in the direction for successively erasing the information recorded on the recording medium. A method and apparatus for manufacturing such an erasing head are also disclosed.

Abstract: An erase head comprises a magnetizable material which can be magnetized into a permanent magnet having N- and S-poles. The magnetization takes place in a manner such that one of the poles which is the first to be contacted by a magnetic medium to be erased is magnetized to produce a field strength which is less than the magnetic field strength produced by the other pole.

Abstract: A magnetic head or transducer assembly for cooperating with a relatively moving magnetic medium and for reading and/or writing a track of magnetic information on the medium and for erasing the edges of the track and old information adjacent to the edges of a newly written track. The head comprises a central magnetic core with a gap on an active face of the head assembly and with a read/write coil on the magnetic core and comprises a pair of additional, erase magnetic cores on opposite sides of the central magnetic core and forming a pair of erase gaps on the active face of the head assembly. A single erase coil is disposed on opposite legs of the erase cores, and an L-shaped side bar completes the erase magnetic circuit for both of the erase cores and lies on one end of the erase coil and provides an air gap between it and the ends of each of these erase core legs so as to cause the action of the two erase gaps to be equal in their erasing action.

Abstract: Apparatus for preventing an inadvertent erasure of a cassette tape in a cassette tape recorder or transcriber which has the function of erasing the full tape width or all the tracks during a rapid advance or a rewind operation. The apparatus disables the full width erasure upon detection of any one of those lugs which are provided on the part of a cassette for purpose of preventing an inadvertent erasure.

Abstract: A magnetic recording medium is erased by mounting at least one magnet with its north-south poles parallel to the surface of the recording medium and transporting the recording medium in a plane horizontal to the north-south pole axis such that the magnetic field lines traverse the recording medium. The magnet may be mounted on an endless belt which moves substantially transverse to the direction of movement of the recording medium. The belt may be oscillated or moved continuously along its transverse path.In an alternative embodiment, magnets may be mounted on the end of an arm which is adapted to be rotated in parallel spaced relation to the surface of the recording medium. Also, a number of permanent magnets may be mounted in two rows in spaced relation to form an aperture therebetween for transport of the recording medium therethrough.

Abstract: A transducer particularly for use with magnetic record disks and composed of cores having transducing gaps therein adapted to contact or be in near contact with a record disk at the gaps an composed also of outriggers on the sides of the cores for increasing the surface area of the transducer adapted to contact or be in near contact with a record disk. The cores are of ferrite and have windings thereon, and the outriggers are of ceramic, both the ferrite and ceramic being nonconductive electrically. One of the outriggers is provided with a plating of electrically conductive material on a side surface with the plating being coterminous with the surface of the outrigger adapted to contact the record disk or be in near contact with it, and a ground lead is connected with the plating so as to ground any electrostatic charge on the surface of the disk.

Abstract: Head support apparatus for a recording and/or playback apparatus including a pivotable support member upon which the head is mounted. The support member is pivotally coupled to a pivot rod and pivots in a plane substantially normal to the movement of tape past the record and/or playback head with the pivotal movement of the support member controlled to selectively place the head in contact with the tape. In one embodiment, the tape is stored in a housing which is supported within the recording/playback apparatus, the tape and tape housing being loaded and unloaded with the assistance of a tray. A second support member adjacent the first-mentioned support member is pivotally coupled to the same pivot rod. A spring is coupled between the tray and the second support member to bias the tray toward a receiving position for receiving a tape housing and to bias the second support member toward the tray.

Abstract: A magnetic head assembly and the method of manufacture therefor comprising a generally cylindrical housing having a tapered portion at one end thereof terminating in a circular aperture having an inner diameter, a circular slider body having an outer diameter slightly less than the inner diameter, a media engaging surface and an internal surface and being disposed within the circular aperture and affixed to the housing. The body also includes a first elongated slot disposed along a first diameter and extending through the body, a second slot disposed along a second diameter normal to the first diameter and extending into the body from the internal surface, and a central aperture extending through the body at the intersection of the first and second slots. A read/write transducer has a pair of read/write pole pieces which are separated to provide a read/write gap and which extend into the first slot with the read/write gap positioned with the central aperture.

Abstract: A magnetic erasing head for magnetic recording apparatus using a static magnetic field. The erasing head includes at least three magnetic poles all of which are arranged to scan the same recorded track on the tape. The first and third poles have the same polarity while the second pole has opposite magnetic polarity. The first pole is arranged to engage the full width of the track and magnetizes it with one polarity. The second pole faces the upper half of the track and magnetizes it with the opposite polarity. The third pole engages the lower half of the track and magnetizes it with the same polarity as the first pole. After passing by these three poles, substantially one-half of the recording track is magnetized with one polarity and the other half of the track is magnetized with the other polarity so that distortion of output signals is maintained small or eliminated for various magnetic tapes having different coercive force values.

Abstract: The present invention relates to an erasing head for a magnetic recording apparatus using a static magnetic field. The erasing head consists of a plurality of magnetic poles having surfaces which confront the recording tape. The first and second poles have polarities opposite to each other. The first pole is arranged to engage a recording track along its full width and magnetizes it to a given polarity. The second pole is arranged to engage the upper half of the track and magnetize it to the opposite polarity. Each half track is magnetized to opposite polarities so that the distortion of output signals is reduced, when the signal is reproduced by a reproducing head engaging both half tracks.