Abstract: A magnetic head having a control portion provided integrally with an opposing surface located opposing the recording surface of a magnetic disc or a head mount for generating a negative pressure between the control portion and the magnetic disc to attract the magnetic disc towards the magnetic head, thereby generating an adequate and sufficient negative pressure in the vicinity of the magnetic head and achieving a good head touch. This configuration enables compact design of the mechanism and an increased recording area of the magnetic disc compared with the case in which a magnetic head and a negative pressure generation type stabilizing plate to attract the magnetic disc towards the magnetic head are separately disposed, and eliminates the need for procedures for separate positioning of the individual magnetic head and stabilizing plate, thereby achieving a considerable reduction in manufacturing steps and production cost.
Abstract: A serial memory in which serial address input devices share a terminal with control signal input devices is suitable for the non-shifting storage of information and includes at least one address counter which receives address incrementation signals from a clock and which is suitable for receiving a preset address on the serial address input means.
Abstract: A selective drive cartridge loading/unloading apparatus connects one motor with multiple driving objects. A worm gear is mounted on the motor shaft in such a manner that it rotates together with the shaft and can move axially along the shaft. The worm gear meshes with different power transmission mechanisms when it is at different points along the shaft.
Abstract: A tape loading apparatus comprising a cassette including a videotape received in the cassette, with a longitudinal axis of the received tape forming a tape datum plane in the cassette. A helical scanning type magnetic head drum is provided having a cylindrical head drum surface and a lead edge, with the tape being set on the cylindrical head drum surface for scanning. The lead edge maintains the lead angle between the tape and the magnetic head drum and limits the vertical movement of tape on the cylindrical head drum surface. A tape-drum contacting axis is a contacting line at which the longitudinal axis of the tape set along the lead edge contacts with the cylindrical head drum surface after the tape setting operation on the cylindrical head drum surface is completed with both of the longitudinal ends of the tape-drum contacting axis being arranged substantially on a plane parallel to the tape datum plane.
Abstract: A driving gear is attached to a capstan motor used for driving a capstan. The driving gear is rotated together with the capstan motor. A vertically-movable gear, which is movable in the axial direction thereof, faces the driving gear, and is designed in such a manner as to selectively mesh with the driving gear. The vertically-movable gear is moved up or down by a switch lever, and this switch lever is swung in accordance with the rotation of a mode-switching cam. When the vertically-movable gear is raised by the up swing of the switch lever and brought into mesh with the driving gear, a front loading mechanism moves a cassette holder which holds a tape cassette containing a magnetic tape, and loads the tape cassette in a tape-driving mechanism by utilization of the rotating force of the driving gear transmitted to the front loading mechanism through the vertically-movable gear.
Abstract: This invention relates to a magnetic memory including a first superconductor wire, a second superconductor wire disposed in such a manner as to cross the first superconductor wire substantially orthogonally, a first magnetic film disposed at the point of intersection between the first and second superconductor wires and a second magnetic film interposed between the first magnetic film and the first or second superconductor films, wherein at least one of the uniaxial magnetic anisotropy within the plane of the films and coercive force of the first and second magnetic films is mutually different. Furthermore, a superconductor film containing a large number of microscopic Josephson junctions is disposed between the first and second magnetic films or on the other side of the superconductor wire connected to the magnetic film, and a lead wire for applying a current is connected to the superconductor film.
Abstract: A tape cassette storage rack can accommodate tape cassettes of different sizes at a predetermined position. The accommodated tape cassette may be directly manually withdrawn from the rack without using a jig or the like. The tape storage racks create a high area efficiency available for the storing of the tape cassettes.
June 14, 1989
Date of Patent:
August 6, 1991
Matsushita Electric Industrial Co., Ltd.
Abstract: An automatic erasing and programming device for erasable programmable read-only memory chips includes a housing having a working surface with a plurality of receptacles for receiving the memory chips. A source of ultraviolet light is provide for erasing the memory chips by ultraviolet light irradiation. An ultraviolet light source for turning it on and off. A device for determining completion of erasure of all old data in the memory chips is connected to the light source control device for turning it off when all old data are erased. A programming device for programming the memory chips with new data is responsive to the erasure determining device for starting programming with the new data when the old data have been erased.
Abstract: A data transfer apparatus has a casing with an entrance slot in which a magnetic tape cassette is to be inserted. Upon full insertion of the cassette to a preassigned standby position, a cassette shift mechanism is activated to transport the cassette from the standby position to a data transfer position opposite a substantially fixed magnetic head. A load/eject lever on the front panel of the casing is to be manually turned following the shifting of the cassette to the data transfer position, in order to cause a pair of drive spindles to move into driving engagement with the hubs of the cassette.
Abstract: An optical recording material (21a) or a photochemical hole burning reaction. That is to say, informations are recorded in the recording material formed of a recording member in which molecules (D.sub.1) to (D.sub.3) having a property of changing characteristics of an optical absorption spectrum before and after the absorption of light by absorbing a light within an inherent wavelength range of the optical absorption spectrum are linked with at least one macromolecular chain (P). The optical recording material can be used in memories in the computer system and the like.
Abstract: A tape player which is reduced in number of parts to permit the space on a head base to be utilized effectively and easy to assemble. The tape player comprises a pinch roller shaft secured to a head base, and a torsion coil spring interposed between the head base and a slide base for urging the head base toward a reel base. When the slide base is moved toward the reel base, the head base is moved in the same direction by way of the torsion coil spring. When the slide base is further moved after stopping of the head base with the pinch roller contacted with a capstan, the torsion coil spring is compressed thereby to resiliently contact the pinch roller with the capstan with a tape held therebetween. The slide base has first and second guide elements formed thereon. The first guide element is fitted in a first guide slot formed in the head base to guide the head base for sliding movement on the slide base.
Abstract: A magnetic tape recording and playback apparatus includes a tape driving system for driving a tape, a recording/playing system for recording/playing/erasing and a linking device for mechanically linking the operations of the tape driving system with the recording/playing system. The tape driving system includes a motor, a gear train coupled to the motor and a reel shaft for rotating reels of the cassette. The gear train includes an planetary gear which swings. The planetary gear selectively rotates the reel shaft in correspondence with respective operation modes of the magnetic recording and playback apparatus. The linking device includes a cam coupled to the planetary gear and a head base mounting a recording/playing head. The cam transmits the driving power from the motor to the head base through the planetary gear. The head base moves corresponding to the shape of the cam and in association with the operation of the planetary gear.
June 7, 1989
Date of Patent:
July 2, 1991
Sanyo Electric Co., Ltd., Tottori Sanyo Electric Co., Ltd.
Abstract: A RAM-based FIFO which provides self-timing of the data outputs in read mode. When the data output is not valid, the data output drivers are in a high-impedance condition. Therefore, FIFOs using this RAM-based architecture can readily be combined to provide a wider or deeper FIFO, without introducing any additional delay whatsoever. Small differential delays are preferably introduced in the activation of the output buffers, to avoid noise on power supply lines.
Abstract: A magnetic disk apparatus has a base member and a cover mounted on the base member to form an enclosure having at least six magnetic disks rotatably supported therein. First and second transducers are included for writing information on and reading information from upper and lower surfaces of adjacent ones of the magnetic disks. The transducers are supported by leaf springs in close proximity to both surfaces of adjacent ones of the magnetic disks. The leaf springs extend in a radial direction with respect to the magnetic disks and are supported on one end by a plurality of head arms. The leaf springs are arranged substantially within the same plane parallel to the magnetic disks so they do not overlie one another. A voice coil motor is provided for moving the head arms in order to position the transducer pairs in predetermined positions. A circuit board is included for controlling the magnetic disk apparatus.
Abstract: A disk player with a disk carrier and disk magazine including a pair of reciprocating slide plates provided with guide holes for the disk carrier and the disk magazine. When the slide plates make a reciprocating motion, the disk carrier and the disk magazine both provided on the slide plates are moved via a combination of the guide holes so that a selected disk is withdrawn from the disk magazine and, after being played, returned to the disk magazine.
Abstract: A tape cassette for a magnetic recording tape having metallic magnetic recording layer is provided with a gas trapping layer which is disposed on a portion of the cassette near the path of the magnetic recording tape stretched between a pair of reels. The trapping layer has a trapping tendency which is at least equivalent to that of the magnetic recording tape. Any corrosive gas components coming into the cassette is adsorbed by and made to react with the trapping layer so as to reduce the concentration of the corrosive gas reaching the metallic magnetic recording layer, thus preventing degradation of the magnetic recording layer and ensuring that recording is conducted with high recording density.
February 10, 1989
Date of Patent:
June 11, 1991
Matsushita Electric Industrial Co., Ltd.
Abstract: A magazine in which a plurality of cartridges are contained as vertically moved stepwise by a distance separating two successive ones of the cartridges. The lift has a plurality of lift steps alternately engaged by a latching member. A rotary disk having two pins on its face is arranged adjacent the latching member. During rotation of the disk, one of the pins pivots the latching member out of engagement with a lift steps while the other of the pins supports the disengaged lift step to raise or lower the lift, depending upon the rotational direction of the disk. Further rotation of the disk permits the spring biased latching member to pivot back into a path where it engages the next lift step, thereby accomplishing one step of movement of the lift. Each time the lift is moved by one step, a pinch roller arrangement detects whether a cartridge is in the magazine corresponding to the position currently aligned with the inlet/outlet of the tape changer.
Abstract: A yoke type thin-film magneto-resistive heat includes a magneto-resistive element that detects the magnetic field generated in the magnetic recording medium as resistance changes, a yoke, that leads magnetic flux from the head gap to the above mentioned magneto-resistive element, a DC magnetic field application system, that applies a desirable weak magnetic field to the above mentioned longitudinal direction of the magneto-resistive element, and a conductor, that applies a desirable bias magnetic field to the above mentioned magneto-resistive element in the strip width direction. The easy axis of magnetization of the magneto-resistive element is inclined in a range of 20.degree.-40.degree. to the mentioned longitudinal direction of the magneto-resistive element, so that, anisotropic angle dispersion conditions are relaxed, at the same time, by applying a desirable bias magnetic field to the magneto-resistive element in the strip width direction.
Abstract: A magnetic-head unit (1) is disclosed which includes a lower and an upper drum (3, 4), between which a rotary head disc (17) is interposed, which disc carries a plurality of magnetic heads (18). The magnetic heads (18) are electrically connected to a transformer comprising a rotary transformer section (8) and a stationary transformer section (10), the stationary transformer section (10) being connected to an amplifier arrangement (16) accommodated in a shielding cover (14, 15). The stationary transformer section (10) is arranged near the upper side of the upper drum (4), a bridge construction (11) being arranged externally of the magnetic-head unit (1) to secure the stationary transformer section (10) to the frame (2) of the magnetic-head unit. The amplifier arrangement (16) is situated inside the shielding cover (14, 15) in the direct proximity of the stationary transformer section (10).
April 12, 1989
Date of Patent:
May 28, 1991
U.S. Philips Corporation
Joannes G. M. Van Thuijl, Aart T. Van 'T Veld
Abstract: A silicon substrate with a drain area formed therein is used for the base of the device. A first polysilicon gate is disposed above the substrate with a layer of gate oxide therebetween. Adjacent to the first gate and contiguous to the same plane is a second polysilicon gate. The second gate and the substrate are separated by a layer of tunnel oxide and silicon nitride. The silicon nitride being used to store a charge. The state of the device is determined by the presence of a capacitance in the substrate generated by the charge on the silicon nitride. This device may function as a nonvolatile memory or a dynamic random access memory with the capability of capturing its DRAM state.