专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5293116A Method and apparatus for measuring nonlinearity in thin film heads during their fabrication 失效
标题翻译：在制造薄膜头期间测量非线性的方法和装置
公开(公告)号：US5293116A
公开(公告)日：1994-03-08
申请号：US882246
申请日：1992-05-08
申请人： Donald E. Horne , Prakash Kasiraj , Fior D. Sargent
发明人： Donald E. Horne , Prakash Kasiraj , Fior D. Sargent
IPC分类号： G01R31/00 , G01R33/12 , G11B5/31 , G11B5/455 , G11B3/90 , G11B27/36 , G11C7/06
CPC分类号： G01R33/1207 , G11B5/3166 , G11B5/455
摘要： At the wafer level, a conventional write signal is applied to a pre-selected thin film head. Thereafter, first and second constant amplitude, differing frequency sine wave signals are applied to the head along with a DC bias signal whose magnitude is varied. The level of frequency mixing in the output signal of the head is detected at each level of magnitude of the DC bias signal and this data is utilized in predicting the level of noise in the read-back signal of the thin film head during normal read and write operations in connection with a rotating storage disk.
摘要翻译：在晶片级，常规的写入信号被施加到预先选择的薄膜头。此后，第一和第二恒定幅度，不同频率的正弦波信号与其幅度变化的DC偏置信号一起施加到头部。在直流偏置信号的每个电平级别检测头部的输出信号中的混频电平，并且该数据用于在正常读取期间预测薄膜磁头的回读信号中的噪声电平，并且与旋转存储盘相关的写入操作。

2. 发明授权

US6111406A System and method for testing a write head in a combined magnetic head using an associated read sensor in the combined head 失效
标题翻译：用于在组合磁头中使用相关联的读取传感器来测试组合磁头中的写头的系统和方法
公开(公告)号：US6111406A
公开(公告)日：2000-08-29
申请号：US920033
申请日：1997-08-28
申请人： Glen Adam Garfunkel , Donald E. Horne , Michael Salo
发明人： Glen Adam Garfunkel , Donald E. Horne , Michael Salo
IPC分类号： G11B5/00 , G11B5/012 , G11B5/31 , G11B5/455 , G01R33/12 , G11B5/39
CPC分类号： G11B5/455 , G11B2005/0013 , G11B5/012 , G11B5/3166
摘要： A method for assessing write element performance in a combined magnetic head that also includes a magneto-resistive (MR) read element for a data storage drive includes exciting the write element with a square wave immediately after lapping the head during manufacture, before mounting the head for operation in the drive. The write element generates an output signal, and the output signal is detected by the read element and then used to determine whether the write element is defective. By using a square wave, temperature gradients in the head and inductive pick up is avoided, thereby facilitating the use of the read element as a test sensor.
摘要翻译：一种用于评估组合磁头中的写入元件性能的方法，该组合磁头还包括用于数据存储驱动器的磁阻（MR）读取元件，包括在制造期间在研磨磁头之后立即激励具有方波的写入元件，然后安装磁头用于在驱动器中操作。写元件产生输出信号，并且读出元件检测输出信号，然后用于确定写元件是否有故障。通过使用方波，避免了头部和感应拾取中的温度梯度，从而便于使用读取元件作为测试传感器。

3. 发明授权

US5508614A Non-contact method for testing for MR shield short circuits 失效
标题翻译：非接触式MR屏蔽短路测试方法
公开(公告)号：US5508614A
公开(公告)日：1996-04-16
申请号：US450751
申请日：1995-05-25
申请人： Glen A. Garfunkel , Donald E. Horne , Robert L. Smith
发明人： Glen A. Garfunkel , Donald E. Horne , Robert L. Smith
IPC分类号： G01R17/10 , G01R33/20
CPC分类号： G01R17/10
摘要： The present invention provides a test circuit and method for testing for short circuits in an MR head, merged MR head or piggyback MR head without contacting either of the shield layers. This is accomplished by a bridge circuit which employs part of the components of the head. The bridge circuit has four consecutively arranged branches which are interconnected by four consecutively arranged terminals. The first terminal comprises the substrate or one of the write pads and the second and fourth terminals comprise the first and second read pads. A signal generator is connected across the first and third terminals and a detector, such as a differential amplifier, is connected across the read pads. With this arrangement the first branch of the bridge circuit includes a capacitance which is formed by one of the gap layers between one of the shield layers and a first one of the leads and the second branch of the bridge circuit includes a capacitance which is formed by said one of the gap layers between said one of the shield layers and a second one of the leads. The differential amplifier detects any impedance imbalance in the bridge circuit which indicates that coupling between one or more of the shields and one or more of the leads has changed. Most likely the head has a shield short circuit and can be discarded.
摘要翻译：本发明提供了一种测试电路和方法，用于在不接触屏蔽层之一的情况下测试MR磁头，合并MR磁头或搭载MR磁头中的短路。这是通过使用头部的一部分的桥接电路实现的。桥接电路具有四个连续布置的分支，其由四个连续布置的端子互连。第一端子包括衬底或写入焊盘之一，第二和第四端子包括第一和第二读取焊盘。信号发生器连接在第一和第三端子之间，并且诸如差分放大器的检测器跨越读取焊盘连接。利用这种布置，桥接电路的第一分支包括由一个屏蔽层之间的间隙层和第一个引线之间的间隙层之一形成的电容，并且桥接电路的第二分支包括由所述屏蔽层中的所述一个之间的间隙层和引线中的第二个间隔层中的一个。差分放大器检测桥接电路中的任何阻抗不平衡，这表明一个或多个屏蔽和一个或多个引线之间的耦合已经改变。头部很可能有屏蔽短路，可以丢弃。

4. 发明授权

US4823205A Capacitive sensor for head positioning in magnetic recording disk files 失效
标题翻译：用于头磁头定位在磁记录磁盘文件中的电容式传感器
公开(公告)号：US4823205A
公开(公告)日：1989-04-18
申请号：US153101
申请日：1988-02-08
申请人： David M. Hannon , Donald E. Horne
发明人： David M. Hannon , Donald E. Horne
IPC分类号： G11B5/596 , G11B21/10 , G11B13/00
CPC分类号： G11B21/106 , G11B5/596
摘要： A capacitive sensor for detecting capacitive contrast servo information on a disk in a data recording disk file includes a center-tapped inductor connected to a high frequency oscillator, a sensing probe formed on the back side of the slider and electrically coupled to one end of the inductor, and a dummy probe also formed on the back side of the slider and electrically connected to the other end of the inductor. The center-tapped inductor forms a primary coil of a transformer so that variations in capacitance sensed by the sensing probe provide a differential output signal in the inductor which is sensed by the transformer secondary coil. The probes, and their electrically conductive leads and terminal pads, are formed by thin film deposition techniques on the back side of the slider and are located with respect to the inductive read/write head so as to equally receive any noise generated by the read/write head. The dummy probe is spaced away from the air bearing surface of the slider so that the variation in capacitance due to the capacitive contrast pattern on the disk is received only by the sensing probe.
摘要翻译：一种用于检测数据记录盘文件中的盘上的电容对比度伺服信息的电容式传感器包括连接到高频振荡器的中心抽头电感器，形成在滑块的背面上的电感耦合器，电感器，以及也形成在滑动件的背面并电连接到电感器的另一端的虚拟探头。中心抽头电感器形成变压器的初级线圈，使得由感测探头感测的电容的变化在电感器中提供由变压器次级线圈感测到的差分输出信号。探针及其导电引线和端子焊盘通过薄片沉积技术在滑块的背面形成，并且相对于电感读/写头位于相同位置，以便均等地接收由读/ 写头虚拟探针与滑动器的空气支承表面间隔开，使得由于磁盘上的电容对比度图形引起的电容变化仅由感测探头接收。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式