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11. 发明专利

AU4641889A SELF-COMPENSATING HIGH DENSITY DATA RECORDING AND DETECTION SCHEME 未知
公开(公告)号：AU4641889A
公开(公告)日：1990-06-12
申请号：AU4641889
申请日：1989-11-13
申请人： BRIER TECHNOLOGY INC
发明人： BIZJAK JOHN , HASSEL MICHAEL , NIEMANN DAVID
IPC分类号： G11B5/09 , G11B20/10 , G11B20/14
摘要： The present invention utilizes a dual frequency data writing scheme. At a first frequency, flux transitions are achieved which result in large excursions of the information signal. In the preferred embodiment, the first frequency approximates the maximum frequency at which such excursions can occur. A second higher frequency is utilized to create the very small or no excursions. At this second higher frequency, a complex flux transition is not achieved. Therefore, there is little or no information signal. Information is represented by the presence or absence of excursions. In the preferred embodiment, the first frequency is approximately 33,000 flux changes per inch, and the second frequency is approximately 67,000 flux changes per inch. In order to detect data written by the present scheme, an adaptive, self-compensating scheme is utilized. The present invention utilizes an excursion detection scheme which is pattern and radii independent. This scheme is self-adjusting in real time and provides recovery of the nominal flux transition independent of the information pattern. Data recovery is qualified through use of a novel excursion detection scheme. This scheme compares variations in the tracking peak detect value with the input signal separated by an excursion threshold value. When the input waveform falls below the adaptive threshold voltage, a data transition is defined.

12. 发明专利

AU4801690A DUAL REFERENCE TRACK SCHEME 未知
公开(公告)号：AU4801690A
公开(公告)日：1990-05-28
申请号：AU4801690
申请日：1989-11-13
申请人： BRIER TECHNOLOGY INC
发明人： KENNY PHILIP , CAUTIS DAN , BIZJAK JOHN
IPC分类号： G11B5/55 , G11B5/584 , G11B21/10 , G01B21/10
摘要： A method and apparatus for performing adaptive calibration of a disk drive assembly and for determining an offset value to compensate for differences in servo head to data head distance from a nominal value. The present invention has particular application in a relative track count servo system where absolute track position is not known from a reading of the servo track itself. In the preferred embodiment, a single head assembly having both a data head and a servo head is utilized. The distance between the data head center and the servo head center must be known so that a disk written on one drive assembly can be read in another drive assembly. This distance is a nominal value but may vary due to manufacturing tolerances. In the present invention, both the data and servo heads are utilized to establish a servo anchor reference track and to determine an offset correction value to compensate for variations in the servo/data head spacing. A dual reference track architecture is employed on the disk surface. The data head is positioned over the first reference track and centered to within a desired accuracy. Once the data head is in place, the servo track beneath the servo head is established as the anchor reference servo track. The heads are then moved across the disk until the data head is positioned over the center of the second reference track. During this movement, the servo tracks are counted to determine the number of servo tracks between the first reference track and the second reference track. This count is then compared to a table storing the number of servo tracks crossed when the data/servo head distance corresponds to the nominal value. The difference in the actual number of tracks crossed and the stored value is used to generate an offset value to compensate for data/servo head distance variations during seeks and other positioning operations.

13. 发明专利

AU2811089A SERVO PATTERN 未知
公开(公告)号：AU2811089A
公开(公告)日：1989-05-23
申请号：AU2811089
申请日：1989-10-28
申请人： BRIER TECHNOLOGY
发明人： BIZJAK JOHN F , SHENFIELD LEONARD ROY , MILLER SCOTT D , KENNY PHILIP C , BENSON WILLIAM , BEHR MICHAEL I
IPC分类号： G11B5/55 , G11B5/596 , G11B21/08 , G11B21/10 , G11B21/02 , G11B5/58
摘要： The present invention describes a time based servo pattern scheme which provides position and velocity information with high accuracy. A plurality of servo lines are formed on a data disk extending from the inner track to the outer track, In the preferred embodiment of the present invention, these lines are employed as part of a buried servo scheme such that the entire useable disk surface is dedicated to data storage. The servo pattern is written on each side of the disk so that, if the disk were transparent, the respective servo lines would appear to intersect when viewed from above. Servo heads located on each side of the disk detect servo line crossings. By comparing the time difference between crossings of corresponding tracks on either side of the disk, the radial position of the heads can be determined. Therefore, even when nominal track centers do not fall on servo line intersections, their position can be determined accurately. Thus, the servo pattern of the present invention is track pitch independent. A concentric calibration track is formed on the disk surface so that offsets between the desired servo and data head positions may be detected and compensated.

14. 发明专利

DE68924173D1 未知
公开(公告)号：DE68924173D1
公开(公告)日：1995-10-12
申请号：DE68924173
申请日：1989-11-13
申请人： BRIER TECHNOLOGY
发明人： KENNY PHILIP , CAUTIS DAN , BIZJAK JOHN
IPC分类号： G11B5/55 , G11B5/584 , G11B21/10
摘要： A method and apparatus for performing adaptive calibration of a disk drive assembly and for determining an offset value to compensate for differences in servo head to data head distance from a nominal value. The present invention has particular application in a relative track count servo system where absolute track position is not known from a reading of the servo track itself. In the preferred embodiment, a single head assembly having both a data head and a servo head is utilized. The distance between the data head center and the servo head center must be known so that a disk written on one drive assembly can be read in another drive assembly. This distance is a nominal value but may vary due to manufacturing tolerances. In the present invention, both the data and servo heads are utilized to establish a servo anchor reference track and to determine an offset correction value to compensate for variations in the servo/data head spacing. A dual reference track architecture is employed on the disk surface. The data head is positioned over the first reference track and centered to within a desired accuracy. Once the data head is in place, the servo track beneath the servo head is established as the anchor reference servo track. The heads are then moved across the disk until the data head is positioned over the center of the second reference track. During this movement, the servo tracks are counted to determine the number of servo tracks between the first reference track and the second reference track. This count is then compared to a table storing the number of servo tracks crossed when the data/servo head distance corresponds to the nominal value. The difference in the actual number of tracks crossed and the stored value is used to generate an offset value to compensate for data/servo head distance variations during seeks and other positioning operations.

15. 发明公开

EP0484906A3 Head mounting device 失效
标题翻译：头安装件
公开(公告)号：EP0484906A3
公开(公告)日：1993-04-28
申请号：EP91118909.0
申请日：1991-11-06
申请人： BRIER TECHNOLOGY
发明人： Bizjak, John F. , Cardona, Joseph
IPC分类号： G11B5/48 , G11B5/58
CPC分类号： G11B33/121 , G11B5/486 , G11B7/08 , G11B33/122 , H01R12/59 , H05K3/363
摘要： A head mounting assembly utilizing a specially designed printed circuit board ("PCB") for supporting a read/write head (235) for a floppy disk drive computer memory unit is presented. The PCB flexure replaces the metal flexure of the prior art. The PCB flexure is configured so as to provide a similar degree of flexibility as the metal flexure of the prior art. The electrical leads of the read/write head (235) are connected to first ends (295) of conductive strips (280) formed on the surface of the PCB flexure. The other ends (280) of the conductive strips are connected to the disk drive's electronics package by means of a single flexible circuit. Additional electronic components such as preamplifier may be mounted on the PCT flexure itself or on the flexible circuit limiting the amount of noise and other interference that may degenerate the signals passing from the read/write head to the disk drive's electronics.

16. 发明公开

EP0484905A2 Interface for disk drives 失效
标题翻译： SchnittstellefürPlattenantrieb。
公开(公告)号：EP0484905A2
公开(公告)日：1992-05-13
申请号：EP91118908.2
申请日：1991-11-06
申请人： BRIER TECHNOLOGY
发明人： Bizjak, John F. , Wilson, Lindell M.
IPC分类号： G11B19/20 , G11B19/02 , G06F3/06 , G11B5/48
CPC分类号： G06F3/0601 , G06F2003/0692 , G11B5/4886 , G11B19/02 , G11B19/20
摘要： A disk drive that can read from and write to both standard floppy disks and high capacity floppy disks. The present invention provides a single slot disk drive that can accept both standard floppy disks and high capacity floppy disks. After a floppy disk is inserted, physical cues on the floppy disk are used to inform the disk drive as to the nature (standard or high capacity) of the inserted disk. The disk drive incorporates two interfaces, a standard floppy disk controller (39, 22) and an IDE interface (38, 21) for high capacity disks. The disk drive is configured so that both interfaces can communicate with a host computer at all times, regardless of what type of disk is inserted in the disk drive. This allows the host computer to operate as if it had two separate disk drives available.
摘要翻译：可读取和写入标准软盘和高容量软盘的磁盘驱动器。本发明提供了可以接受标准软盘和高容量软盘的单槽磁盘驱动器。在插入软盘之后，软盘上的物理线索用于通知磁盘驱动器有关插入磁盘的性质（标准或高容量）。磁盘驱动器包含两个接口，标准软盘控制器（39,22）和用于高容量磁盘的IDE接口（38,21）。磁盘驱动器被配置为使得两个接口可以始终与主机通信，而不管磁盘驱动器中插入什么类型的磁盘。这允许主机操作，就好像它有两个独立的磁盘驱动器可用。

17. 发明公开

EP0393116A4 SERVO PATTERN 失效
标题翻译：伺服图案
公开(公告)号：EP0393116A4
公开(公告)日：1991-01-30
申请号：EP89900444
申请日：1988-10-28
申请人： BRIER TECHNOLOGY
发明人： BIZJAK, JOHN, F. , SHENFIELD, LEONARD, ROY , MILLER, SCOTT, D. , KENNY, PHILIP, C. , BENSON, WILLIAM , BEHR, MICHAEL, I.
IPC分类号： G11B5/55 , G11B5/596 , G11B21/08 , G11B21/10 , G11B5/58 , G11B21/02
CPC分类号： G11B5/5965 , G11B5/5534 , G11B5/59661
摘要： A track pitch independant time based servo pattern scheme used for providing position and velocity information. A plurality of servo lines (1A-7A, 1B-7B) are formed on a data disk extending from the inner track to the outer track. These servo lines can be buried beneath the data layers to increase the data storage capacity. The servo pattern can also be written on both sides of the disk so that, if the disk was transparent, the servo lines would appear to intersect when viewed from above. Servo heads (16A, 16B) located on each side of disk detect servo line crossings and by comparing the time difference between track crossings of corresponding tracks on either side of the disk the position of the heads can be determined. A concentric calibration track (109) is used to determine the offsets between the desired data heads (20) and servo heads (28) positions.

18. 发明公开

EP0484907A3 Magnetic head positioning scheme using a capacitive transducer 失效
标题翻译：使用电容式换能器的磁头定位方案
公开(公告)号：EP0484907A3
公开(公告)日：1994-01-12
申请号：EP91118910.8
申请日：1991-11-06
申请人： BRIER TECHNOLOGY
发明人： Kelly, John J. , McGrath, Michael , Miyamura, Harold
IPC分类号： G11B5/55
CPC分类号： G11B5/5547
摘要： A method and apparatus for improving the accuracy and reliability of positioning magnetic recording heads (28) upon rotating magnetic media (30) in a flexible disk drive assembly. The disk drive of the present invention implements a closed loop head positioning scheme. A capacitive transducer assembly (32, 34) is used to provide track crossing information for track positioning purposes. The capacitive transducer scheme includes a transmitter (32) and a receiver (34). The receiver is mounted on the disk drive and is fixed relative to the transmitter which is mounted on the read/write head carriage (26). The relative positions of the transmitter and receiver is determined by comparing the phase of the transmitter signal to the transmitter-induced output signal of the receiver. A "comb" pattern is implemented in the transmitter and receiver and generates time coincident zero crossings that indicate track crossings. A special signature pattern, that may be separate from the track positioning pattern is used to identify a track zero location.Track zero and index position sensor (29) is fixed when the disk drive is manufactured. Any alignment errors are identified and an offset correction factor is generated to compensate for the errors. This offset compensation factor is stored in a nonvolatile memory (12) and is utilized by disk drive control electronics during operation of the drive to insure appropriate drive operation.
摘要翻译：一种方法和装置，用于改善在软盘驱动器组件中旋转磁介质（30）时定位磁记录头（28）的精度和可靠性。本发明的磁盘驱动器实现闭环磁头定位方案。电容式换能器组件（32,34）用于提供用于轨道定位目的的轨道交叉信息。电容式换能器方案包括发射器（32）和接收器（34）。接收器安装在磁盘驱动器上，并相对于安装在读/写头托架（26）上的发送器固定。发射机和接收机的相对位置是通过比较发射机信号的相位和接收机的发射机感应输出信号来确定的。在发射机和接收机中实施“梳形”模式，并生成指示轨道交叉的时间重合过零点。使用可能与轨道定位模式分离的特殊签名模式来识别轨道零点位置。当制造磁盘驱动器时，轨迹零点和索引位置传感器（29）是固定的。识别出任何对准误差并生成偏移校正因子以补偿误差。该偏移补偿因子被存储在非易失性存储器（12）中并且在驱动器的操作期间被磁盘驱动器控制电子器件使用以确保适当的驱动操作。

19. 发明公开

EP0447460A4 DUAL REFERENCE TRACK SCHEME 失效
标题翻译：双参考轨迹方案
公开(公告)号：EP0447460A4
公开(公告)日：1992-12-02
申请号：EP90900681
申请日：1989-11-13
申请人： BRIER TECHNOLOGY
发明人： KENNY, PHILIP , CAUTIS, DAN , BIZJAK, JOHN
IPC分类号： G11B5/55 , G11B5/584 , G11B21/10 , G01B21/10
CPC分类号： G11B5/584 , G11B5/5534 , G11B5/5547 , G11B21/106

20. 发明公开

EP0484906A2 Head mounting device 失效
标题翻译： Kopfhalterung。
公开(公告)号：EP0484906A2
公开(公告)日：1992-05-13
申请号：EP91118909.0
申请日：1991-11-06
申请人： BRIER TECHNOLOGY
发明人： Bizjak, John F. , Cardona, Joseph
IPC分类号： G11B5/48 , G11B5/58
CPC分类号： G11B33/121 , G11B5/486 , G11B7/08 , G11B33/122 , H01R12/59 , H05K3/363
摘要： A head mounting assembly utilizing a specially designed printed circuit board ("PCB") for supporting a read/write head (235) for a floppy disk drive computer memory unit is presented. The PCB flexure replaces the metal flexure of the prior art. The PCB flexure is configured so as to provide a similar degree of flexibility as the metal flexure of the prior art. The electrical leads of the read/write head (235) are connected to first ends (295) of conductive strips (280) formed on the surface of the PCB flexure. The other ends (280) of the conductive strips are connected to the disk drive's electronics package by means of a single flexible circuit. Additional electronic components such as preamplifier may be mounted on the PCT flexure itself or on the flexible circuit limiting the amount of noise and other interference that may degenerate the signals passing from the read/write head to the disk drive's electronics.
摘要翻译：提出了一种利用专门设计的用于支持用于软盘驱动器计算机存储器单元的读/写头（235）的印刷电路板（“PCB”）的头安装组件。 PCB弯曲替代现有技术的金属弯曲。 PCB弯曲构造成提供与现有技术的金属弯曲度相似程度的柔性。读/写头（235）的电引线连接到形成在PCB挠曲件的表面上的导电条（280）的第一端（295）。导电条的另一端（280）通过单个柔性电路连接到磁盘驱动器的电子封装。附加的电子部件例如前置放大器可以安装在PCT挠曲件本身上或柔性电路上，限制可能将从读/写头传递到盘驱动器的电子装置的信号退化的噪声和其他干扰的量。

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