Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 7706102 | Secure data storage A hard disk drive includes a chassis which supports a “sealed” housing containing a data storage magnetic disk, and read/write heads and actuator. The housing also contains an erasure device which generates a magnetic or other field or emanation for erasing the ... | 04/27/2010 |
| 7576949 | Servo track magnetic recording head for pre-erasing magnetic tape The present invention relates to direct current (“DC”) pre-erasing servo channels of a magnetic tape prior to writing servo data in a servo channel. The present invention particularly relates to those servo recordings which were written with a uni-polar current ... | 08/18/2009 |
| 7561378 | Data erasing device using permanent magnet A data erasing device that erases data recorded on a magnetic disk, by a magnetic field generated in a horizontal direction by magnets, in order to prevent leakage of the data recorded on the magnetic disk of a magnetic disk device to be abandoned. The data erasing ... | 07/14/2009 |
| 7394619 | Disk drive write head for writing cross-track magnetizations An inductive write head has its write poles and write gap oriented to generate magnetic fields in the cross-track direction on a magnetic recording disk in a disk drive. The disk has the magnetizations in the concentric data tracks oriented in the cross-track direct... | 07/01/2008 |
| 7319569 | Servo writer A servo writer is provided, which applies DC magnetization to a zone of a magnetic tape that is in advance subjected to AC erasing and writes a servo signal onto the DC magnetized zone. The servo writer has a DC erasing head and a servo signal writing head. The DC e... | 01/15/2008 |
| 7301716 | Stepped time based servo pattern and head The present invention relates to a method of synthesizing the slanted transitions in a time based servo pattern using servo write gaps that are perpendicular to the tape motion. The present invention particularly relates to a method of writing a servo pattern on mag... | 11/27/2007 |
| 7289289 | Recording servo stripes onto a servo track To access data on a storage medium, at least three servo stripes simultaneously recorded in a servo track are read. The at least three servo stripes have different orientations on the servo track. An indication of a lateral position of a storage medium access head w... | 10/30/2007 |
| 7280299 | Recording method for magnetic recording medium, recording device for magnetic recording medium and magnetic recording medium After a DC erasing is performed in a direction by permanent magnets on a servo signal recording part, servo signals are recorded in the signal recording area of the servo signal recording part by a magnetic field in the direction opposite to that of the DC erasing. ... | 10/09/2007 |
| 7256962 | Magnetic tape drive with AC erase element upstream from plural head elements A magnetic head including a plurality of head element units provided along a width direction with respect to a magnetic tape. Each head element unit is provided with at least one recording element for recording a data signal on the magnetic tape and at least one rep... | 08/14/2007 |
| 7199957 | Write head alignment for full amplitude time-based servo The invention is directed to a servo writing apparatus having accurate alignment of write gaps of servo write heads. In particular, the write gaps substantially align in a servo channel corresponding to a servo band of a magnetic data storage tape. The servo band is... | 04/03/2007 |
| 7133245 | Servo write head assembly and servo writer A servo write head assembly comprises an AC demagnetizing head that slides in contact with a magnetic tape all of which surface is magnetized in one direction of longitudinal directions thereof, and demagnetizes a data band of the magnetic tape; a servo write head t... | 11/07/2006 |
| 7109837 | Controlled inductance device and method Improved inductive apparatus having controlled core saturation which provides a desired inductance characteristic with low cost of manufacturing. In one embodiment, a pot core having a variable geometry gap is provided. The variable geometry gap allows for a “step... | 09/19/2006 |
| 7061742 | Desk-top continuous-use magnetic media eraser/degausser A manually operated continuous-use desk-top magnetic media eraser/degausser that utilizes elaborately shielded state-of-the-art Rare Earth Magnets to uniformly remove magnetically recorded information from audio and video tapes, PC diskettes, and many other types of... | 06/13/2006 |
| 7027259 | Disk unit with increased head-positioning accuracy A disk unit for reading information from or writing information to a disk by means of a head supported by an actuator includes a shroud having a face perpendicular to a surface of the disk and opposing a peripheral edge of the disk, and a spoiler having a given heig... | 04/11/2006 |
| 7027709 | Method for forming magnetic gap of video signal erasure head, erasure head, and video recorder having the same The invention provides a simple method for forming a gap for an erasure head to improve the quality of this erasure head. A front core 3 constituting an erasure head H includes in configuration two magnetic substances 5 and a magnetic gap 6 made... | 04/11/2006 |
| RE39029 | Magnetic recording/reproducing apparatus with the recording/reproducing heads preceding the erasing heads A magnetic recording/reproducing apparatus is provided in which among diametrically oppositely disposed heads, a recording head and an erasing head of a same channel are disposed adjacently to each other. The recording head is disposed so as to precede by two tracks... | 03/21/2006 |
| 7006324 | Disk drive including an airflow blocker with a planar portion extending from a blocker arm portion A disk drive includes a disk drive base and at least one rotatable disk including a disk surface extending to an outer disk edge. The disk drive further includes a head stack assembly rotatably attached to the disk drive base in operable communication with the disk,... | 02/28/2006 |
| 6920685 | Method for fabricating a thin film magnetic head A writing magnetic pole portion composed of a first magnetic film and a second magnetic film formed on the first magnetic film via a gap film is fabricated on a given wafer. Then, the writing magnetic pole portion is swung forward and backward around a rotation stan... | 07/26/2005 |
| 6903899 | Magnetic disk device with wind shield members The magnetic disk device includes magnetic disks, magnetic head arms and wind shield members arranged above and below the magnetic disks, respectively, in a region adjacent to the magnetic head arms. The wind shield members are arranged on the rotationally upstream ... | 06/07/2005 |
| 6822827 | Erasure techniques for magnetic tape media Methods and apparatus for erasing magnetic tape are described. The tape to be erased is fed through an erasure unit that includes an array of magnetic elements. The array of magnetic elements includes a first set of magnetic elements and a second set of magnetic ele... | 11/23/2004 |
| 6714398 | Bulk degausser with fixed arrays of magnetic poles configured for thick and small form factor, high coercivity media A bulk degaussing apparatus and method for erasing magnetic media of various sizes. A media passage track is provided such that media passing therethrough is uniformly exposed to the magnetic fields provided through the gap. The bulk degaussing apparatus has fixed m... | 03/30/2004 |
| 6072668 | Full width erase head assembly for magnetic reproducer Disclosed is a full width erase head assembly for a magnetic reproducer. According to the present invention, a horizontal flow preventing member is extended to a predetermined angle from a rear side portion of the body which is installed on the main base.... | 06/06/2000 |
| 6064537 | Disk drive with fault detector for erase heads A floppy disk drive comprises a read/write head and a pair of erase heads. The read/write head has a gap that extends across and beyond opposite edges of a track, while the gaps of the erase heads are aligned with each other and extend from the opposite e... | 05/16/2000 |
| 6040963 | Fringe field compensation system for multi-track servo recording head A multi-track servo recording head assembly records a plurality of identical tracks of servo information longitudinally defined within a very high density servo section along a magnetic recording medium. The servo recording head assembly includes a write ... | 03/21/2000 |
| 5979774 | Magnetic display erasing apparatus including a plurality of magnets A magnetic display erasing apparatus is provided in which an ideal erasing magnetic field can be realized by using a small-sized magnet. A magnet is formed by bending a rectangular plate-like magnet, having the N-pole on the surface and the S-pole on the ... | 11/09/1999 |
| 5959812 | Fringe field compensation system for multi-track servo recording head A multi-track servo recording head assembly records a plurality of identical tracks of servo information longitudinally defined within a very high density servo section along a magnetic recording medium. The servo recording head assembly includes a write ... | 09/28/1999 |
| 5953482 | Magnetic recording/reproducing apparatus with the recording/reproducing heads preceding the erasing heads A magnetic recording/reproducing apparatus is provided in which among diametrically oppositely disposed heads, a recording head and an erasing head of a same channel are disposed adjacently to each other. The recording head is disposed so as to precede by... | 09/14/1999 |
| 5822160 | Full erase head with guide portion being supported by the tape guide post of VCR A full erase head assembly for erasing a signal recorded on a tape includes a full erase head, a guide post installed on a deck base for guiding the tape, a guide portion formed on a first side of the full erase head, the guide portion being supported by ... | 10/13/1998 |
| 5771128 | Edit recording method and apparatus using erase head control An edit recording method and apparatus using erase head control is provided in which connection portions between programs are edited and recorded in a manner which prevents the erasure of a recorded end portion between a full erase head and a video head w... | 06/23/1998 |
| 5742460 | Movable full erasing head A full erasing head unit disposed on a deck chassis of a video cassette recorder includes a full erasing head, a base plate for mounting the full erasing head thereon in such a way that the full erasing head comes into contact with a traveling tape, the b... | 04/21/1998 |
| 5537277 | Magnetic head for use in converting a low track density disk to a high track density disk A magnetic head for sliding on a recording medium for executing magnetic recording or magnetic reproducing of information includes a magnetic core having a recording/reproducing magnetic gap whose track width is defined narrow in accordance with high-rank... | 07/16/1996 |
| 5428892 | Method of manufacturing a combined tunnel erase head In a method of manufacturing a tunnel erase type combined magnetic head core using a first core member having a predetermined pole height dimension defined by a surface on a magnetic gap formation side and an apex, and a predetermined back height dimensio... | 07/04/1995 |
| 5309296 | System for eliminating noise arising from difference in polarity of magnetization by tunnel erase heads A magnetic disk drive is disclosed which has a tunnel erase head assembly comprising a read/write head for writing and reading data on a magnetic disk, and a pair of tunnel erase heads for trimming a pair of opposite marginal edges of the record track bei... | 05/03/1994 |
| 5243483 | Rotary drum device This invention relates to a rotary drum device used in magnetic recording and playback apparatus such as VTRs, and particularly to the structure of a magnetic head and flying erasure head mounted on the rotary drum. The flying erasure head and recording h... | 09/07/1993 |
| 5229903 | Magnetic head with inclined core The structure of a magnetic head for use in a disk drive has an erase core and a read/write core which are inclined to a track of a floppy disk or disket. An erase gap and a read/write gap formed in the erase core and read/write core, respectively, each i... | 07/20/1993 |
| 5181150 | Dual magnetic head for reading and writing information at high and low track density including erase gaps having an undulating shape A dual magnetic head capable of reducing unneccessary magnetic flux developed in erase cores. The dual magnetic head includes a first read/write core (30) having a first gap width (34) and extending in a track direction in which the tracks will be formed ... | 01/19/1993 |
| 5138508 | Magnetic head core A composite magnetic head core with a writing/reading track and two erasing tracks, including a first ferrite block, and a second and a third ferrite block bonded to opposite surfaces of the first block interposed therebetween. The opposite abutting surfa... | 08/11/1992 |
| 5132860 | Magnetic media erasure system An erasure system for magnetic information storage media is disclosed by which magnetic media, such as computer, video and audio tapes, cassettes and discs, can be thoroughly erased. The system uses high energy product permanent magnets preferably positio... | 07/21/1992 |
| 5122916 | Electromagnetic head having interference compensation circuitry In a magnetic sensing head with reduced crossfeed interference circuitry, the winding of each half of a magnetic core of the head is wound in the same direction as the other about the core. Each winding is coupled to an individual differential amplifier a... | 06/16/1992 |
| 5061842 | Erasure mechanism for card readers A card reader having a card reading mechanism, a card perforating device and a card erasure mechanism, wherein the erasure mechanism comprises a permanent magnet movable by means of a pivoted arm towards and away from a card erasure position, and a drive ... | 10/29/1991 |
