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公开(公告)号：US3787964A
公开(公告)日：1974-01-29
申请号：US3787964D
申请日：1971-12-23
Applicant: IBM
CPC classification number: G11B5/3133 , G11B5/17 , G11B5/3166 , Y10T29/49004 , Y10T29/49036 , Y10T29/49044 , Y10T29/49046 , Y10T29/49064
Abstract: This disclosure relates to a method for manufacturing a magnetic head. The steps of the method comprise forming a transformer having a first magnetic layer, a primary winding, a secondary winding separated from the primary winding, the primary and secondary windings being disposed on the first magnetic layer, and a second magnetic layer disposed over the primary and secondary windings. The first and second magnetic layers encircle portions of the primary and secondary windings thus forming a continuous magnetic path. Tests determinative of its magnetic properties are made on the transformer. Thereafter, the transformer is severed between the primary and the secondary windings and the secondary is discarded. The primary is then lapped to form a thin-film magnetic head.
Abstract translation: 本公开涉及一种用于制造磁头的方法。 该方法的步骤包括形成具有第一磁性层，初级绕组，与初级绕组分离的次级绕组，初级和次级绕组设置在第一磁性层上的变压器，以及设置在初级绕组上的第二磁性层 和次级绕组。 第一和第二磁性层围绕初级和次级绕组的部分，从而形成连续的磁路。 在变压器上进行其磁特性的测定。 此后，变压器在初级绕组和次级绕组之间被切断，次级绕组被丢弃。 然后将主体研磨以形成薄膜磁头。
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公开(公告)号：US3778819A
公开(公告)日：1973-12-11
申请号：US3778819D
申请日：1972-11-17
Applicant: IBM
Inventor： BHAGAWAN V , JONES R , MCDOWELL A , RUPP B , WHITTAKER R , MINE G , REMSBURGER L
CPC classification number: H03M11/18
Abstract: A circuit is provided for operating a keyboard in a selected one of four character sets: upper and lower case Latin and upper and lower case Katakana. The circuit responds to signals produced by the familiar Shift and Lock keys of a conventional keyboard. One of the shift keys is designated a Latin shift key and the other is designated a Katakana shift key. Depressing a shift key momentarily sets the keyboard to operate in the lower case of the character set identified by the shift key. For upper case, the operator either sets the shift Lock or holds the appropriate shift key while striking a character key. A specific logic circuit is disclosed.
Abstract translation: 提供一种用于操作四个字符集中所选择的一个键盘的电路：大小写拉丁语和大小写片假名。 电路响应常规键盘熟悉的Shift和Lock键产生的信号。 其中一个换档键被指定为拉丁移位键，另一个被指定为片假名移位键。 按下shift键可以暂时将键盘设置为在由Shift键识别的字符集的小写中操作。 对于大写字母，操作员可以设置移位锁定或保持适当的移位键同时敲击字符键。 公开了一种特定的逻辑电路。
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公开(公告)号：ZA796366B
公开(公告)日：1980-11-26
申请号：ZA796366
申请日：1979-11-23
Applicant: IBM
Abstract: A thin film magnetic transducer for reading and writing a track on a magnetic recording medium consists of layers deposited on a deposition surface of a non-magnetic substrate (20) which has an air bearing surface (ABS) at right angles to the deposition surface. Two of the layers (14, 15) are of magnetic material to form a yoke (13) with a pole tip region having a transducing gap (18) at the air bearing surface(ABS), and with a back region. A read/write coil (10a to 10h) is coupled to the back region. The pole tip region has a width approximating to track width and a length (D) of approximately 5/d where d is the recording density on the recording medium in order to minimise signals from adjacent tracks and maximise read resolution. The thickness and width of the layers (14, 15) in the back region are greater than those dimensions in the pole tip region, the increase in width being provided by a taper. The width of the back region is greater than the width of the pole tip region, the wider back region tapering to join the pole tip region. Also the thickness of the back region magnetic layers (14,15) is at least 60% greater than the thickness of the pole tip region. The back region is designed taking into account saturation to provide an efficient write operation.
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Patent Agency Ranking
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公开(公告)号：SE343698B
公开(公告)日：1972-03-13
申请号：SE424267
申请日：1967-03-28
Applicant: IBM
Abstract: 1,114,148. Record retrieval. INTERNATIONAL BUSINESS MACHINES CORPORATION. 6 March, 1967 [28 March, 1966], No. 10383/67. Heading G4C. A position in a storage unit is addressed and a key field of the record in the addressed position is compared with a mask, the comparison being at least partly under control of a field of the record which specifies the length of the key field, a data field of the record being retrieved on equality. A computer selects a bulk storage module (magnetic discs, drums or tapes) using conventional channel controls by supplying its address, the module recognizing the address and sending its address to the computer for a check comparison. The computer selects a read-write head in the storage module and can perform an associative search on the records in the track thus selected, a serial by bit comparison being performed in the module for high, low or equal under control of the computer apprised of the progress of the search by status bytes transmitted from the module. Each record has three portions. The first portion identifies the disc surface, track and access mechanism (associative search may be done on these bytes) and specifies the lengths of the key and data fields. The second and third portions contain the key and data fields respectively. Associative search may be done on either of them. Particular bytes are skipped during this associative search if the bytes supplied by the computer at the corresponding times for comparison are special " skip " characters. Each portion also contains burst check bytes, an accumulating shift register being provided for checking purposes. Parity bits are also mentioned. A decrementable control counter, presettable from the length fields, is used to delineate the various record fields. Communication with the computer is serial by parallel byte, serial to parallel and parallel to serial conversion being performed as necessary. Ring counters are provided for gating purposes. Each track also starts with various identifying indicia.
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公开(公告)号：BR7908411A
公开(公告)日：1980-09-23
申请号：BR7908411
申请日：1979-12-20
Applicant: IBM
Abstract: A thin film magnetic transducer for reading and writing a track on a magnetic recording medium consists of layers deposited on a deposition surface of a non-magnetic substrate (20) which has an air bearing surface (ABS) at right angles to the deposition surface. Two of the layers (14, 15) are of magnetic material to form a yoke (13) with a pole tip region having a transducing gap (18) at the air bearing surface(ABS), and with a back region. A read/write coil (10a to 10h) is coupled to the back region. The pole tip region has a width approximating to track width and a length (D) of approximately 5/d where d is the recording density on the recording medium in order to minimise signals from adjacent tracks and maximise read resolution. The thickness and width of the layers (14, 15) in the back region are greater than those dimensions in the pole tip region, the increase in width being provided by a taper. The width of the back region is greater than the width of the pole tip region, the wider back region tapering to join the pole tip region. Also the thickness of the back region magnetic layers (14,15) is at least 60% greater than the thickness of the pole tip region. The back region is designed taking into account saturation to provide an efficient write operation.
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