Abstract: Disclosed is a magnetic recording/reproduction apparatus wherein a pulse corresponding to rotation of a magnetic disk is obtained by detecting a PG yoke signal as a rotational position detection index in the disk by a PG coil as a pulse detection means, recording/reproduction control is performed by a control circuit or the like as erase recording/reproduction control means operated in accordance with the pulse, erase and recording/reproduction operations of data are performed with respect to the disk by a composite magnetic head controlled by the erase recording/reproduction control means, i.e., the composite magnetic head in which an erase gap and a read/write gap are internally provided so as to be separated from each other in the longitudinal direction of a recording track.

Abstract: A magnetic head device for a floppy disk drive apparatus, which can read data from, and write data on, floppy disks of different recording densities is disclosed. The magnetic head device comprises a read/write head having at least two read/write gaps, an erase head, and gap selecting circuit. The read/write gaps have different gap length one another. Respective gap lengths correspond to the recording densities of the floppy disks. A gap selecting circuit of the magnetic head device selectes an optimal read/write gap for the floppy disk loaded to the floppy disk drive apparatus. The type, or the recording density, of the floppy disk loaded to the floppy disk drive apparatus is checked by means of a high recording density detecting switch. The detecting switch sends a signal to the gap selecting circuit in accordance with the recording density of the loaded floppy disk.

Abstract: An improved form of magnetic erase head is provided which utilizes, in a magnetic erase head, leading and trailing "terminators", which suppress stray fields emanating from leading and trailing magnets.

Abstract: A new use of manufacture is disclosed. The marketing research method includes preparing a video tape for viewing by a member of a defined research sample. The tape is placed into a cassette and supplied to the member. In some cases the tape is viewed on a one-time basis. The survey material is collected and analyzed.

Abstract: A magnetic head apparatus used for a movable magnetic medium, comprising a magnetic head core in which a recording/reproducing core and an erasing core are respectively disposed on the entrance side of the movable medium and on the exit side of the movable medium, both of the cores being formed as an integrated magnetic core. The head cap of the recording/reproducing core is placed within a range defined between a position spaced about 0% of the longitudinal length of the integrated magnetic core apart from the center of the magnetic core toward the entrance side of the movable medium and another position spaced about 20% of the longitudinal length of the integrated magnetic core apart from the center toward the exit side of the movable medium.

Abstract: A complex magnetic transducer head with a single magnetic pole includes a recording and reproducing main magnetic pole made of a thin film of soft magnetic material with a predetermined width and in contact with a magnetic recording medium. A non-magnetic guard member is adjacent each side of the recording and reproducing main magnetic pole and a magnetic core portion is integrated with each guard member. Grooves are formed in the magnetic core portion for separating a first auxiliary magnetic pole portion in contact with the recording and reproducing main magnetic pole from a magnetic flux return path portion. The winding is wound around the recording reproducing main magnetic pole through the grooves.

Abstract: A tunnel erasing-type magnetic head having a short distance between the gaps, wherein a second core half is sandwiched between the first core half and the third core half, a magnetic gap for recording and reproducing the signals is formed between the first core half and the second core half, and a magnetic gap for erasing is formed between the second core half and the third core half, so that the second core half can be utilized for both recording and reproducing the signals and erasing the signals. The second core half is obtained by forming a thin magnetic film of a high saturation flux density on the base portion composed of a nonmagnetic material that forms the magnetic gap. The first and third core halves are also obtained by forming a thin magnetic film of a high saturation flux density on the magnetic gap surfaces of the base portions to produce performance that can be used for the magnetic recording media having high coercive force. The magnetic head has a short distance between the gaps.

Abstract: A cassette having improved erasing means is disclosed. The cassette has a top and a base which define a front wall. The front wall defines an opening through which the tape passes on its way to a take-up reel mounted in the base. A magnet which is aligned in a horizontal orientation is mounted adjacent the opening. As the tape passes the magnet, the signals on the tape are erased. The magnet is moved out of its erase position to allow redubbing of the tape.

Abstract: A composite magnetic head is integrally formed with a recording/reproducing head section having a recording/reproducing gap and an erasing head section having two erasing gaps. The magnetic head has formed in its surface facing a magnetic recording medium two parallel diagonal grooves extending across the two head sections which are inclined with respect to the gaps and spaced apart so as to define the outer ends of the recording/reproducing gap and respective inner ends of each of the erasing gaps.

Abstract: Based on the fact that the recording track width depends on the width of a core at the trailing side relative to the moving direction of magnetic recording medium, narrower track recording and wider track erasing, or a two-mode recording operation either for high-density recording or normal-density recording are realized using a single magnetic head having a narrower core and a wider core opposing to each other through a gap by changing the moving direction of the magnetic recording medium relative to the magnetic head.

Abstract: An apparatus having a pair of magnetic transducer head assemblies for data transfer with both sides of a recording medium such as a flexible magnetic disk. One of the head assemblies is mounted via a planar flexure seat on a carriage movable radially of the medium, whereas the other head assembly is mounted via another planar flexure seat on a load arm which is hingedly mounted on the carriage for pivotal motion toward and away from the medium. At least one, preferably both, of the head assemblies has a data transfer coil such as a read/write coil at least partly, preferably wholly, disposed on that side of the flexure seat which is directed toward the recording medium. An erase coil, if any, of each head assembly may also be disposed on the same side of the flexure seat. This coil arrangement affords a significant reduction in the thickness of the apparatus.

Abstract: Track misregistration between a read-back head and a previously recorded pair of tracks can cause erroneous data to be detected by the read head. It has been discovered that a prior erasure to eliminate any residual magnetization reversals occurring between and along side of the two parallel data tracks in twin track vertical recording can unexpectedly increase track misregistration tolerance by several hundreds of percents over the tolerance exhibited by twin track vertical recording having no pre-write erasure in the space between tracks and along side of the tracks. The erase before write technique may be practiced with a new read-write head structure having an E-shaped erase core aligned with the twin track read-write head and insulated from it to precede the read-write structure in the direction of relative motion between the read-write head structure and the magnetic medium.

Abstract: A magnetic disk drive apparatus is disclosed including a read and write head having a read and write coil and an erase head having an erase coil at the opposite sides of the read and write head for erasing data at the both sides of the written data track, the improvement includes a leakage magnetic flux cancelling coil wound on the read and write head which is energized with a d.c. current for cancelling the leakage magnetic flux from the erase head when the erase coil is energized with a d.c. current.

Abstract: The present invention relates to a magnetic head, which can form guard bands on a magnetic recording medium and which is especially suitable for magnetic discs, and a fabrication process thereof. The magnetic core of the present invention includes a recording and reproduction head core (31) and an erasure head core (32) which is integrally joined in series to the head core (31) for forming guard bands. Magnetic circuits are constructed of metallic magnetic materials (34), (34'), (35) and (35') formed on non-magnetic members (33) and (33'). As a result, a recording medium having high coercive forces can be recorded while the track width is reduced and the fabrication is facilitated with a high accuracy.

Abstract: A magnetic recording apparatus of a helical scanning system comprises a rotary cylinder (13), recording heads (A and B) and an erase head (10) attached to slightly project from a rotating surface (13a) of the cylinder (13). The rotary erase head (10) has a gap (4) comprising a ferrite core half (1) and a Sendust film (3) formed on a ferrite core half (2) opposed to the ferrite core half (1) and having a larger saturation magnetic flux density. In addition, the recording heads (A and B) and the rotary erase head (10) are attached on the rotary cylinder (13) so that an end (P1) located forward with respect to the tape travelling direction (11) of the Sendust film (3) may trace the backward side with respect to the tape travelling direction (11), apart by a distance which is a half of the gap length of the rotary erase head (10), as compared with a forward end (Q) of a recorded track pattern ( 15a) formed on a tape (14) by the recording head (A) scanning immediately after erasing by the rotary erase head (10).

Abstract: A magnetic head comprising a pair of erasing cores, a coupling body coupling the pair of erasing cores together, the coupling body having a groove, and a recording and reproducing core fitted into the groove in the coupling body so as to form an erasing gap on each side of the recording and reproducing core. At least the periphery of the groove is formed by a nonmagnetic material having a glass erosion resistance.

Abstract: A magnetic head comprises a first magnetic core having a first gap on an exposed surface side; a second magnetic core having a second gap on an exposed surface side forming an identical surface with an exposed surface of the first magnetic core, and disposed in the vicinity of the first magnetic core; and a magnetic film disposed in the vicinity of the second magnetic core and for magnetically short-circuiting a magnetic circuit of the second magnetic core without passing through a coil wound around the second magnetic core. The magnetic film prevents crosstalk to the first magnetic core from the second magnetic core.

Abstract: A read head for a Wiegand wire has an E-core with a pick-up coil for the "1" bit wound on one outer leg and a separate pick-up coil for the "0" bit wound on a second outer leg. The E-core is composed of a relatively thin ferromagnetic E-laminae spaced from a relatively thick E-laminae. Between thin and thick laminae in each leg there is an appropriately polarized magnet. The result is to establish a first field across the face of the read head between the center leg and a first outer leg. This first field reads the one bits. Similarly, a second field between the center leg and the other outer leg reads the zero bits. Each one bit wire is on one side of the code strip and each zero bit wire is on the other side of the code strip so that the one bit and zero bit wires are passed respectively across the first and second reading fields provided by the read head.

Abstract: A magnetic head for vertical magnetic recording having a leg portion formed on a core on the recording and reproducing side, which leg portion is put in connection with the recording and reproducing magnetic thin film and a leg portion formed on a core on the erasing side, which leg portion is put in connection with the erasing magnetic thin film. A recording and reproducing coil is provided on the leg, or pillar, portion formed on the core on the recording and reproducing side and an erasing winding, or coil, is provided in a groove, or on a pillar portion, formed on the core on the erasing side.

Abstract: An erasing head for magnetic recording medium by magnetizing said recording medium with a permanent magnet is improved by a ferrite head body having a slider plane wider than a track to be erased, and, a magnetic metal thin film covering said slider plane. Said magnetic thin film solves the problem caused by undesired natural magnetization of a permanent magnet, so as to improve the erase ratio and S/N ratio, and the use of slider plane wider than that of a track simplifies producing process of the head since no step is provided between the track to be erased and neighboring track, and no polishing process for smoothing said step is required.

Abstract: In a hard disk drive with a closed housing (10) enclosing a magnetic disk pack (24,26) and a carrier arrangement (32) for magnetic heads (36), permanent-magnet or electromagnetic erase heads (44,62) are arranged in this which can be operated independently of the magnetic heads (36).

Abstract: A magnetic head assembly comprises a recording-reproducing head and erasing heads placed at both sides of said recording-reproducing head and the magnetic field strength of the erasing gap of one of the erasing heads which move adjacent data produced by a recording-reproducing gap is made different from that of the erasing gap of the other erasing gap to control a data area to be erased.

Abstract: An information processing apparatus for effecting the erasure of information recorded on a recording medium has wide area erasing means for erasing the recording information of a wide area recorded on the recording medium, and narrow area erasing means for erasing the recorded information of a relatively narrow area as compared with the wide area erasing means. The wide area erasing means and the narrow area erasing means are used together to erase a desired range of recorded information.

Abstract: In a magnetic transducer of the type including a pair of opposed, generally C-shaped pole pieces positioned in facing relationship with a gap between first ends of the pole pieces, each pole piece being formed from a ferrite material and having a coil would therearound, and at least one length of conductive gap material positioned within the gap so as to shunt the magnetic lines of flux flowing through the pole pieces into a magnetic recording medium which engages the pole pieces in the area of the gap, there is disclosed an improved erase head wherein an elongate bar made from a conductive material is positioned between the pole pieces, in the cavity therebetween, parallel thereto and to the gap and spaced from the gap.

Abstract: A non-magnetic part bonded to a magnetic core portion made of Ni-Zn ferrite in a magnetic head assembly which is made of a ceramic material comprised of 30 to 50 volume % of TiO.sub.2 and 70 to 50 volume % of Ba.sub.2 Ti.sub.9 O.sub.20 and BaAl.sub.2 Ti.sub.5 O.sub.14 wherein the volume ratio of Ba.sub.2 Ti.sub.9 O.sub.20 to the total volume of Ba.sub.2 Ti.sub.9 O.sub.20 and BaAl.sub.2 Ti.sub.5 O.sub.14 is 0.05 to 0.5.

Abstract: A video tape cassette includes a case or housing formed by upper and lower mating case sections of molded plastics material. A tape supply reel and a take-up reel are supported for rotation within the housing, and a prerecorded magnetic tape is wound onto the supply reel. The leading end portion of the tape extends around guide rollers along a predetermined path to the take-up reel, and a tape erasing element or magnet is supported within the housing to erase the prerecorded material from the tape as it is wound onto the take-up reel and thereby provide for only one time viewing of the prerecorded material. The internal tape erasing element may be made ineffective to provide for original recording of the material on the tape and may be made ineffective after the one time viewing so that the cassette may be reused by the purchaser as a blank cassette. The cassette may also be constructed as a disposable cassette.

Abstract: A tape cassette comprising at least one print-through echo-erasing device in the form of at least one appropriately shaped magnetic member made of permanent magnet material which is conveniently arranged on a tape guide element or near the apertures in the front wall of the cassette housing for the admission of scanning means. Such echo-erasing device can be used with advantage in any kind of magnetic tape cassette or cassette containing a recording medium having at least one magnetic track.

Abstract: An automatic tape loading type recording and/or reproducing apparatus comprises a guide drum having one or a plurality of recording and/or reproducing heads for recording and/or reproducing a signal on and/or from a tape, first and second loading members which relatively enter within a tape cassette which is loaded into the apparatus, a first loading mechanism for moving the first loading member over a short distance so as to draw the tape out of the loaded tape cassette and wrap the tape around a peripheral surface of the guide drum, a second loading mechanism comprising a rotatable loading ring mechanism which is disposed to encircle the guide drum, for moving the second loading member along the peripheral surface of the guide drum in a direction opposite to the moving direction of the first loading member so as to draw the tape out of the loaded tape cassette and wrap the tape around the peripheral surface of the guide drum, and a control mechanism for controlling an operating timing of the first loading m

Abstract: Given that there is a limit to the extent to which a record head may be excited before its pole tips saturate (gap fuzziness) while overwriting a second set of information signals atop a first set of information signals recorded in a high coercivity recording medium, the present invention concerns the discovery that if the record gap is dimensioned to equal approximately the flux change length that corresponds with a 2 f signal (FCL.sub.2) recorded atop a 1 f signal, i.e. if the record gap is somewhere between about 0.7 and 1.5 times the flux change length associated with the 2 f signal, erasure of the 1 f signal (as well as other signals) will be most effective.

Abstract: A magnetic head assembly has, at least, a recording/reproducing magnetic head made of an Mn-Zn ferrite, a first reinforcer made of a non-magnetic ceramic material and bonded by a glass to the recording/reproducing magnetic head in parallel with the gap formed in the recording/reproducing magnetic head, erasing magnetic heads attached to both sides of the first reinforcer so as to limit the recording width of the recording/reproducing magnetic head, and second reinforcers made of a non-magnetic ceramic material and bonded in parallel to gaps in the erasing magnetic heads, the second reinforcers being positioned at both sides of said recording/reproducing magnetic head. The area Af defined by the thermal expansion coefficient curve of the Mn-Zn ferrite in the temperature range between the normal room temperature and the softening point of the bonding glass and the area Ac defined by the thermal expansion coefficient curve of the first reinforcer in the same temperature range satisfy the following condition:-3.

Abstract: A magnetic head comprising a recording/reproducing core is formed with a recording/reproducing gap at an intermediate portion of the tip end portion thereof, and a pair of erasing cores are arranged on either side of the tip end portion to sandwich the recording/reproducing core. The magnetic head is characterized in that a part of the tip end portion of the recording/reproducing core is made thinner than the other portion thereof and that the pair of erasing cores are arranged at the opposite sides of the thin portion.

Abstract: The present invention relates to a tape recorder and, more particularly, to a tape recorder having an automatic reverse function. The tape recorder has a selecting structure, a head and a head rotating mechanism. When control buttons are operated by a user, the selecting structure can select one of the forward and reverse tape transport directions, and the head rotating mechanism can rotate the head to one of the two positions corresponding to the forward and reverse tape transport directions in accordance with a selection by the selecting structure. The tape contact surface of the selecting structure then faces the tape.

Abstract: A magnetic head assembly for writing on and reading out data or signals from a magnetic medium such as a floppy disc, having a read-write magnetic head and eraser magnetic heads in combination. Control of the depth of the eraser gap in this magnetic head assembly is accomplished not by the eraser magnetic head core, but by the read-write magnetic head core.

Abstract: Magnetic recording circuitry supplies to the recording head in addition to the signal to be recorded a train of constant amplitude pulses of extremely short duration and of low duty cycle; for example, pedestal pulses of polarity corresponding to the signal are superimposed on the signal for higher positive and negative signal amplitudes, while alternating polarity pulses are supplied during periods of low signal amplitude, such that the transducer system exhibits a substantially linear transfer function.

Abstract: A magnetic erasing head of a double effective gap type which has gaps different in width to each other, includes a magnetic center core having a predetermined width positioned between the gaps and a winding for inducing a magnetic flux. An erasing signal is supplied to the winding, and a wavelength of the erasing signal having a predetermined relationship relative to a width of the magnetic center core.

Abstract: In a flexible disc device having a magnetic head for reading data written in a flexible disc medium or writing data to the medium, the magnetic head enables to change effective track width specified by core width of writing/reading head gap and erasing head gap at the writing state corresponding to the record density in the diameter direction of the disc medium, thereby compatibility is obtained between plural sorts of flexible disc media being different in the track density.

Abstract: A magnetic head unit comprises erase heads on both sides of a read/write head and an erasing back core having the -shaped cross section consisting of a magnetic material. The back core is engaged with the open end of a rear part opposing to the gap forming region in front of the cores of both erase heads, thereby ensuring high magnetic efficiency, receiving lesser influence of external magnetic field, and improving the magnetic characteristic and back core mounting work efficiency.

Abstract: In a magnetic head having a write/read layer for writing and reading data, erase layers for erasing edge portions of recording newly written in a writing operation and recording previously written, and an erase-back core, the improvement wherein the erase-back core is made of metal magnetic material and has side clamping pieces for clamping the core on both sides of the erase layers.

Abstract: A magnetic head suitable for use in a magnetic disk. In a magnetic head in accordance with the present invention, a read/write head and an erase head are placed side by side in the rotation direction of the magnetic disk. A gap in the read/write head is placed at a distance of l from a pair of gaps in the erase head. In addition, the read/write gap in the read/write head is deviated by a distance L in the external circumference direction with respect to a pair of erase gaps in the erase head.

Abstract: A magnetic erasing head for erasing a magnetic recording media such as magnetic tape. The device has a head surface defined to make sliding contact with the tape surface. The head surface includes a permanent magnet material and a high permeability material. The permanent magnet material defines the portion of the head surface extending from the inlet side toward the exit side thereof for the sliding tape and is magnetized to include portions which have alternate polarities and which have a field strength which gradually decrease from the inlet side to the exit side of the head surface. The high permeability material defines a portion of the head surface with a predetermined length from the exit side toward the inlet side and with a width of about one-half of the recording track of the tape. The high permeability material is positioned substantially in alignment with the center of the recording track.

Abstract: A tape recorder using a magnetic erase head wherein the erase head is brought into contact with a tape in the record mode and is separated therefrom in the play mode. A record operating member determines whether or not the erase head is brought into contact with the tape. The movement of the erase head is controlled by the rotational force of the motor, thereby improving "soft-" or "feather-touch" operation.

Abstract: A read head for a Wiegand Wire has a low reluctance core on which a pick-up coil is wound. The Wiegand Wires are passed over a face of the core and coil and switch state directly over the core and coil so that the change in the magnetic field is coupled to the coil to produce an output pulse. Outboard of the direction in which the Wiegand Wires travels are first and second magnets that generate the field. In contact with these magnets and bridging both sides of the coil are first and second magnetic shunt members which control and determine the shape of the field. A first magnetic shunt member has a relatively narrow bridge portion which saturates under the field involved and thus there is a large leakage field adjacent to the face of the read head for the purpose of appropriately setting the Wiegand Wires. The second shunt has a much larger bridge portion so that there is much less leakage flux. However this smaller leakage flux is in the opposite direction from the leakage flux from the first shunt.

Abstract: The disclosed erasing apparatus serves for erasing a signal from individual recording tracks of a magnetic recording medium. A soft magnetic and high permeability member forms a magnetic circuit which passes through a magnetic head and the recording medium. A suitable arrangement causes either the magnetic head or the high permeability member to produce a magnetic field for erasing the signal.

Abstract: In a video tape recorder having at least one rotary magnetic head for recording and reproducing a video signal on a magnetic recording tape, a control signal which will be used for controlling the rotation of the rotary head and the movement of the tape is recorded via a stationary head located at a preceding point from the rotary head. The gap of the stationary head extends in the transverse direction of the tape so as to cover the entire or nearly entire width of the tape. Thus, the control signal is recorded on the magnetic tape throughout the entire or nearly entire width thereof, preventing undesirable dropout. By supplying the stationary head with a high frequency erasing current together with the control signal, the stationary head may function not only as a control signal recording head but also as an erase head.

Abstract: A transcriber used for repeatedly reproducing information recorded on a tape, comprised of a through-hole provided in a part of the main body of the transcriber and an eraser which has a magnet to generate magnetic flux in a prescribed direction to the through-hole.

Abstract: The data recovery procedure for errors caused by track occlusion as a result of adjacent track misregistration or head sensitivity to the low frequency content of adjacent tracks is effected by reading and storing the information from the adjacent tracks and thereafter erasing the adjacent tracks either on centerline or with the transducer offset toward the intermediate track of interest. The track of interest can then be read with the transducer aligned with the track centerline and at varying positions of offset. If this sequence of rereads fails, the erase step can be repeated with greater amounts of offset toward the intermediate track to further reduce inband interference and the reread sequence also repeated.

Abstract: A magnetic head characterized in that a nonmagnetic material of an erasing core chip in which two erasing cores are coupled by the nonmagnetic material is provided with a groove portion and that a recording/reproducing core is inserted in the groove portion. The magnetic head can be fabricated by a method characterized by comprising the step of providing first and second orthogonal grooves in a face plate, the step of providing the groove portion in the nonmagnetic material of the erasing core chip, the step of inserting the recording/reproducing core in the first groove, inserting the erasing core chip in the second groove and inserting the recording/reproducing core in the groove portion of the nonmagnetic material, and the step of fixing the face plate, the recording/reproducing core and the erasing core chip with glass or the like and polishing a front surface of the face plate.

Abstract: A magnetic head assembly comprising a read/write head unit adapted for reading and writing data and provided with a magnetic core 1 having a thin sheet of an Mn-Zn ferrite. The magnetic head assembly also has erase head units bonded to the read/write head unit and adapted to erase the edges of the data, each of the erase head units being provided with a magnetic core 2 having a thin sheet of an Ni-Zn ferrite. The read/write head unit and erase head units are bonded by means of a glass 6.

Abstract: A degaussing head is mounted on a tape drive transport unit adjacent to a rotating reel of tape. The degaussing head is selectively energized by a signal indicating that the tape is to be erased. Preferably, the degaussing head takes the form of an E-shaped iron core driven by a coil supplied with attenuated DC current. The degaussing head is mounted on the door of the tape drive transport cabinet in such a manner that when the door is closed the legs of the degaussing head orthogonally span the tape in the reel to provide an attenuated alternating magnetic field for bulk erasing the tape as it is rotated past the head.

Abstract: A magnetic head device comprising a recording/playback magnetic head and erasing magnetic head, each of which consisting of cores made from a ferrite of Mn-Zn system and a reinforcement plate made from a non-magnetic ceramic material and bonded to respective cores; and sliders made from a non-magnetic ceramic material and united with the magnetic heads. The non-magnetic ceramic material for the sliders has a thermal expansion coefficient which is at least 5.times.10.sup.-7 /.degree.C. greater than that of the non-magnetic ceramic material for the reinforcement plate.