Abstract: A magnetic head has a pair of magnetic core halves opposed to each other with a non-magnetic material posed therebetween to form a magnetic gap, which head includes a pair of magnetic core halves, a first ferromagnetic metal thin film and a second ferromagnetic metal thin film. The magnetic core halves are formed of ferromagnetic oxide such as Mn-Zn ferrite, and they have opposing surfaces opposed to each other to provide the magnetic gap. The first ferromagnetic metal thin film formed of Fe-Si-Al alloy is formed at least on one of the opposing surfaces. The second ferromagnetic metal thin film formed of Fe-Si-Al alloy having different constituent ratio from the first ferromagnetic metal thin film is formed between the magnetic gap and the first ferromagnetic metal thin film. The flux density of the second ferromagnetic metal thin film induced when a magnetic field of 1.2K oersted is applied exceeds 1000 gauss.

Abstract: A tape cassette arranged such that coarse surface areas are formed on guide surfaces used to guide a magnetic tape along the external surface of the front side wall portion formed inside of a cassette lid and that the coarse surface areas are gradually reduced toward the seam 19 of upper and lower parts. Thus, when the upper and lower parts are molded, the upper and lower parts can be removed from the metal molds with ease. Also, electrification can be prevented from occurring in the magnetic tape or in the upper and lower parts when the magnetic tape is transported along the guide surfaces.

Abstract: An assembly and method for securing head suspension members on shelf segments of metallic or ceramic actuator arms in a disk drive. The assembly comprises an actuator arm with a reduced thickness shelf segment, at least one head suspension member, a staking member having particular attributes and a staking plate also having particular attributes. The assembly is designed such that forcible expansion of the staking member takes place exclusively within the material of the staking plate member. The method is formulated such that the constituent elements of the assembly are aligned, placed under compression and staked together wherein an interference fit is formed between the staking member and staking plate member and no forcible pressure from the staking procedure is transmitted to the actuator arm. The assembly and method are ideally utilized in a multi-disk disk drive in which a plurality of head suspensions are secured to multiple arms of a single actuator in a single procedure.

Abstract: A magnetic disk apparatus for reading and writing user's data from a magnetic disk having a data surface with a plurality of concentric data tracks the data surface having a void area in which user's data is inhibited. The magnetic disk apparatus includes a magnetic head for reading and writing the user's data from and to the data tracks, detecting apparatus for detecting a circumferential position of the magnetic head at a target track, a store for storing the position and length of the void area, a timing clock generator for generating a read/write synchronization signal and control circuitry for preventing transmission of the read/write synchronization signal during a time period corresponding to the length of the void area when the circumferential position of the magnetic head corresponds to the position of the void area, thereby inhibiting read-out or write-in to or from an interface circuit while transmission of read/write synchronization signal is prevented.

Abstract: A digital signal processing circuit comprising two memory groups to sequentially store digital data of transmission rate t input by a frame unit, a first controller to control the memory groups so that one of the memory groups simultaneously reads out the stored digital data at transmission rate t/n while another memory group sequentially stores the digital data, a signal processor to sequentially signal-process digital data of n systems alternately output from the two memory groups on DAT format, respectively; two other memory groups to alternately store the data signal-processed by the signal processing means, respectively, and a second controller to control the two other memory groups so that one of the two other memory groups outputs the stored and signal-processed digital data at a velocity n times as great as that on memory in a predetermined sequential manner while the other memory groups store the signal-processed data output from the signal processor.

Abstract: A method of recording including the steps of dividing data of each of a group of frames including video signals and a group of channels of audio signals into a group of divided data independent from other data to be recorded on a recording medium and dividing each of a group of tracks provided on the recording medium into a group of sectors along the longitudinal direction thereof onto which the divided data are separately and optionally recorded so as to be subsequently changed by other divided data during the editing of data and recording the divided data onto the sectors such that each of the divided data relating to the same kind of source signals is arranged in succession within at least more than two of the sectors of tracks which are positioned adjacent to each other in the direction of moving the recording medium so as to form an editing data until consisting of the same kind of source signals which is adapted to be scanned by at least more than two heads at the same time during the editing of data.

Abstract: A floppy disk cleaning machine which has a locker to cause a cam above a link to compress a positioning plate for holding of a floppy disk, a sector wheel at an end of the link to drive a sector wheel at a driving rod which consequently disengage the cam from two rolling shafts which then cause two cleaning rods to hold the floppy disk at its read/write slots by action of a spring, and a motor with rubber shaft to drive a turn plate to rotate the floppy disk for cleaning purpose. The rolling shafts can be extended by the cam after the cleaning process for removal of the floppy disk from the cleaning machine.

Abstract: A thin film magnetic head of the present invention comprises an insulating layer and a protective layer both of which are made of a magnetic material or a nonmagnetic material containing a magnetic material so as to inhibit the contour effect which is a trouble in making an attempt to increase the recording density.

Abstract: A double-side magnetic recording-reproducing apparatus, wherein a top magnetic head and a bottom magnetic head are respectively provided upwardly and downwardly of a magnetic recording medium to be rotated by a spindle motor, and magnetic recording on the both surfaces of the magnetic recording medium or magnetic reproducing therefrom is performed. An actuator for vertically moving the spindle motor and the magnetic recording medium, respectively, is provided, the side of the magnetic recording medium is vertically moved by the actuator, and the top magnetic head or the bottom magnetic head is selectively brought into contact with the top surface or the undersurface of the magnetic recording medium.

Abstract: A disc cartridge loading device for loading a disc cartridge onto a disc drive device includes a retention lever having an engaging portion engaging a recess of the disc cartridge and mounted on a cartridge holder for rotation and movement in the disc cartridge inserting-discharging direction, a spring for biasing the retention lever into rotation in a direction of engagement of the engaging portion with the recess and also into movement in the disc cartridge inserting direction, and an engagement releasing mechanism for rotating the retention lever for releasing the engagement of the engaging portion with the recess up on movement of the retention lever in the disc cartridge discharging direction for halting the disc cartridge at a predetermined position during ejection of the disc cartridge.

Abstract: The magnetic tape cassette of the present invention has the opening portion into which the head drum having the rotary head is inserted. The pair of tape guide members which guide the tape-like record medium so that the record medium is helically wrapped around the head drum are provided in the inside of the opening portion so as to be able to swing independently. Thus, when the head drum is inserted into the opening portion, the two tape guide members are brought in circumferential contact with the peripheral surface of the head drum accurately. Therefore, the recording and/or reproduction can be reliably carried out, which can increase reliability of the magnetic tape cassette.

Abstract: Disclosed is a novel flying head supported on a stationary, rigid arm to present a "hydrodynamic" head-face to a passing flexible record segment, the segment being induced by this face to automatically assume a prescribed, relatively controlled configuration and spacing relative to the head-face.

Abstract: A head carrier for carrying a plurality of head/arm assemblies each of which comprises a rigid arm portion supporting two flexures biased away from each other and a transducer bearing slider at the free end of each flexure. The head carrier provides the head/arm assemblies in the correct orientation for assembly to the actuator mechanism of a disk file. The head/arm assemblies can be attached to the actuator without removing the carrier.

Abstract: A video signal recording apparatus which records a video signal on a recording medium after separating a fixed time portion of an input video signal and extending the time axis of the separated video signal.

Abstract: A computerized video record rental system and method in which a video record unit such as a tape cassette is provided with an integral counting device for counting the number of times the record is played. Upon rental and return of the record, the counts are recorded in computer memory, together with an identification of the record unit, and the computer computes the rental fee due based on the net play count for the record unit. A central computer is provided at a location remote from the rental sites. The computers at the rental sites are connected to the central computer periodically by way of modems and telephone lines. The central computer is similarly linked to computer terminals located at the record owners' places of business. Rental information is gathered from the rental sites in the central computer, which reports rental figures to the owners.

Abstract: A regulating plate disposed opposite to a magnetic head with respect to a rotary flexible magnetic disk and in sliding contact with the flexible magnetic disk, having protruding portions provided on the regulating plate at upstream and downstream sides of the magnetic head, top portions of the protruding portions being formed to flat surfaces, thereby obtaining stable sliding contact of the magnetic head with the flexible magnetic disk from the beginning, and a thin film magnetic head comprised at least of a magnetic layer, a coil conductor layer, and an insulative layer formed on a substrate, and a protective layer stacked on the magnetic layer, characterized in that the protective layer comprises MgO, SiO.sub.2, and Al.sub.2 O.sub.3.

Abstract: A disc drive unit for rotating a data storage disc such as an optical disc or a magnetic disc comprising a turntable for supporting and rotating the disc, and a motor for rotating the turntable. The turntable also functions as a rotor of the motor. At least one driving magnet is mounted on the turntable in opposing relationship with at least one coil of the motor. At least one attraction magnet for securely holding the disc in position on the turntable is securely mounted thereon. One yoke functions as yokes, each of which must be provided for each of two kinds of magnets. When the turntable is made of a plastic, at least one attraction magnet and/or at least one driving magnet is defined by partially magnetizing the turntable at at least one predetermined region thereof. The turntable is securely attached to the bearings so that it rotates about a shaft having one end securely fixed to a stationary portion of the motor.

Abstract: Methods and circuitry for generating sector and data cell timing frequencies for banded variable frequency sector disc drive systems with dedicated plus embedded servo positioning systems which have the timing signals synchronized to servo track information written on a dedicated surface of the disc.

Abstract: A tape loading apparatus according to the present invention comprises a cam gear and a first and second arms that are pivotally mounted by a chassis. The second arm has a guiding pin, and engages the first arm through an urging spring mounted between the two arms. The first arm member is provided with a guiding pin at one end portion thereof which engages a cam groove of the cam gear and is guided along the cam groove from a first end to a second end of the groove when the cam is rotated. Before the guiding pin reaches the second end of the cam groove, the pinch roller abuts a capstan and is the pressed against the capstan by an urging force of the spring when the guiding pin reaches the second end of the case cam groove.

Abstract: A system for recording a plurality of marking signals on a record carrier track during scanning thereof, and for detecting from the track during scanning thereof the marking signals recorded thereon. The system includes recording apparatus which generates the marking signals (M1, M2, M3) as different combinations of first and second recording signals (S1, S2) of different frequencies and of durations which are selected by respective time-control stages (Z1, Z2). The first marking signal (M1) may consist of only the first recording signal (S1) having a predetermined duration T; the second marking signal (M2) may consist of the combination of the first marking signal (S1) of duration T and the second marking (S2) of the same duration T; and the third marking signal (M3) may consist of the combination of the first recording signal (S1) of duration (P) and the second marking signals (S2) of a duration between T and zero such as T/2.