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1. 发明申请

WO1990005280A1 DUAL REFERENCE TRACK SCHEME 审中-公开
标题翻译：双参考轨迹方案
公开(公告)号：WO1990005280A1
公开(公告)日：1990-05-17
申请号：PCT/US1989005119
申请日：1989-11-13
申请人： BRIER TECHNOLOGY, INC.
发明人： BRIER TECHNOLOGY, INC. , KENNY, Philip , CAUTIS, Dan , BIZJAK, John
IPC分类号： G01B21/10
CPC分类号： G11B5/584 , G11B5/5534 , G11B5/5547 , G11B21/106
摘要： A method and apparatus for performing adaptive calibration of a disk assembly and for determining an offset value to compensate for differences in servo head (28) to data head (29) 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 (15) itself. In the preferred embodiment, a single head assembly (27) 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 (10) 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 (11) and centered to within a desired accuracy.

2. 发明专利

DE68924173T2 未知
公开(公告)号：DE68924173T2
公开(公告)日：1996-05-15
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.

3. 发明专利

DE3854924D1 未知
公开(公告)号：DE3854924D1
公开(公告)日：1996-02-29
申请号：DE3854924
申请日：1988-10-28
申请人： BRIER TECHNOLOGY
发明人： BIZJAK JOHN , SHENFIELD LEONARD , MILLER SCOTT , KENNY PHILIP , BENSON WILLIAM , BEHR MICHAEL
IPC分类号： G11B5/55 , G11B5/596 , G11B21/08 , G11B21/10 , G11B5/58 , G11B21/02
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.

4. 发明专利

DE68921349T2 未知
公开(公告)号：DE68921349T2
公开(公告)日：1995-10-05
申请号：DE68921349
申请日：1989-11-13
申请人： BRIER TECHNOLOGY
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.

5. 发明申请

WO1990005975A1 SELF-COMPENSATING HIGH DENSITY DATA RECORDING AND DETECTION SCHEME 审中-公开
标题翻译：自我补偿高密度数据记录和检测方案
公开(公告)号：WO1990005975A1
公开(公告)日：1990-05-31
申请号：PCT/US1989005120
申请日：1989-11-13
申请人： BRIER TECHNOLOGY, INC.
发明人： BRIER TECHNOLOGY, INC. , BIZJAK, John , HASSEL, Michael , NIEMANN, David
IPC分类号： G11B05/09
CPC分类号： G11B20/10009 , G11B20/1419
摘要： At a first frequency (30), flux transitions are achieved which result in large excursions of the information signal. The first frequency approximates the maximum frequency at which such excursions can occur. A second higher frequency (89) is utilized to create small or no excursions. At this second frequency, a complete flux transition is not achieved. Information is represented by the presence or absence of excursions. An adaptive, self-compensating scheme, which is self-adjusting in real time and provides for recovery of the nominal flux transition independent of the information pattern, is utilized. Data recovery is qualified through the use of an excursion detection scheme which compares variations in the tracking peak (91) detect value with the input signal separated by an excursion threshold value. When the input waveform falls below the adaptive threshold voltage (94), a data transition is defined.
摘要翻译：在第一频率（30），实现了磁通转换，导致信息信号的大偏移。第一个频率近似于发生这种偏移的最大频率。使用第二较高频率（89）创建小的或不偏离的偏移。在该第二频率下，不能实现完全的磁通转换。信息由有或无缺席表示。利用自适应自补偿方案，其实时自调节并且提供独立于信息模式的标称通量转换的恢复。通过使用偏移检测方案来限定数据恢复，其将跟踪峰值（91）检测值的变化与由偏移阈值分隔的输入信号进行比较。当输入波形低于自适应阈值电压（94）时，定义数据转换。

6. 发明申请

WO1989004040A1 SERVO PATTERN 审中-公开
标题翻译：伺服图案
公开(公告)号：WO1989004040A1
公开(公告)日：1989-05-05
申请号：PCT/US1988003837
申请日：1988-10-28
申请人： BRIER TECHNOLOGY
发明人： BRIER TECHNOLOGY , BIZJAK, John, F. , SHENFIELD, Leonard, Roy , MILLER, Scott, D. , KENNY, Philip, C. , BENSON, William , BEHR, Michael, I.
IPC分类号： G11B05/58
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.
摘要翻译：用于提供位置和速度信息的轨道间距独立时基伺服模式方案。在从内轨到外轨延伸的数据盘上形成有多条伺服线（1A-7A，1B-7B）。这些伺服线路可以埋在数据层之下，以增加数据存储容量。伺服模式也可以写在磁盘的两侧，因此如果磁盘是透明的，伺服线将从上方观看时会相交。位于盘的每一侧的伺服头（16A，16B）检测伺服线路交叉，并且通过比较盘的任一侧的相应轨道的轨道交叉点之间的时间差，可以确定头部的位置。使用同心校准轨道（109）来确定期望的数据头（20）和伺服头（28）位置之间的偏移。

7. 发明专利

AT133287T 未知
公开(公告)号：AT133287T
公开(公告)日：1996-02-15
申请号：AT89900444
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
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.

8. 发明专利

DE68921349D1 未知
公开(公告)号：DE68921349D1
公开(公告)日：1995-03-30
申请号：DE68921349
申请日：1989-11-13
申请人： BRIER TECHNOLOGY
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.

9. 发明公开

EP0449853A1 SELF-COMPENSATING HIGH DENSITY DATA RECORDING AND DETECTION SCHEME 失效
标题翻译： FOR DATA高密度自动补偿制记录和重放。
公开(公告)号：EP0449853A1
公开(公告)日：1991-10-09
申请号：EP89913192.0
申请日：1989-11-13
申请人： BRIER TECHNOLOGY
发明人： BIZJAK, John , HASSEL, Michael , NIEMANN, David
IPC分类号： G11B5 , G11B20
CPC分类号： G11B20/10009 , G11B20/1419
摘要： Des transitions de flux sont effectuées à une première fréquence (30) et donnent comme résultat de grandes excursions du signal d'information. La première fréquence avoisine la fréquence maximale à laquelle de telles excursions peuvent se produire. Une seconde fréquence plus élevée (89) est utilisée pour créer de petites excursions ou ne pas créer d'excursion du tout. A cette seconde fréquence, une transition de flux complète n'est pas effectuée. Des informations sont représentées par la présence ou l'absence d'excursions. Un programme adaptatif à auto-compensation, autoréglable en temps réel et assurant la récupération de la transition du flux nominal indépendamment de la configuration des informations est utilisé. La récupération des données est qualifiée en utilisant un programme de détection d'excursions qui compare des variations de la valeur de détection de crête de poursuite (91) avec le signal d'entrée séparé par une valeur seuil d'excursion. Lorsque la forme d'onde d'entrée tombe sous la tension de seuil adaptative (94), une transition de données est définie.

10. 发明专利

DE3854924T2 未知
公开(公告)号：DE3854924T2
公开(公告)日：1996-09-05
申请号：DE3854924
申请日：1988-10-28
申请人： BRIER TECHNOLOGY
发明人： BIZJAK JOHN , SHENFIELD LEONARD , MILLER SCOTT , KENNY PHILIP , BENSON WILLIAM , BEHR MICHAEL
IPC分类号： G11B5/55 , G11B5/596 , G11B21/08 , G11B21/10 , G11B5/58 , G11B21/02
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.

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