公开(公告)号：EP0248650A3

公开(公告)日：1988-10-26

申请号：EP87304907

申请日：1987-06-03

Applicant: FUJITSU LIMITED

Inventor： Mihara, Takahisa ,  Samma, Shoji ,  Saito, Sigeo

IPC: G11B05/48 ,  G11B05/55 ,  G11B25/04

CPC classification number: G11B33/121 ,  G11B5/4853 ,  G11B5/486 ,  G11B5/4886 ,  G11B5/5521 ,  G11B25/043

Abstract: A half-height magnetic disc device comprising: a base (1); four magnetic discs (4) arranged one above the other on the base (1); five head arms (6e) rotatable about a pivot (6f) for seeking motion on both surfaces of each magnetic disc (4); eight magnetic heads (5) each attached to an end of the head arm (6e) through springs (8, 9) facing a surface of each disc (4); a rotational drive unit (6b, 6c) for swinging the head arms (6e); a main printed circuit board (7) arranged on a rear side of the base (1); and, a cover (2) which covers an upper surface of the base (1).

公开(公告)号：EP0183412A3

公开(公告)日：1987-09-16

申请号：EP85308122

申请日：1985-11-07

Applicant: Ing. C. Olivetti & C., S.p.A.

Inventor： De Marco, Giuliano ,  Fehl, Alessandro

IPC: G11B05/02 ,  G11B15/12 ,  G11B05/48 ,  G11B05/265 ,  G11B05/012 ,  G11B05/55

CPC classification number: G11B5/012 ,  G11B5/02 ,  G11B5/2655 ,  G11B5/488 ,  G11B5/4886 ,  G11B15/12

Abstract: Apparatus for recording and reproducing data on a magnetic recording medium (27) having a plurality of recording tracks (29) comprises a magnetic head (32) and a mechanism which selectively positions the head (32) with respect to the tracks (29) of the magnetic medium (27). The head has at least two gaps which are of different lengths and which can be selected one at a time for reading and/or recording data on the magnetic recording medium (27). A control circuit controls the positioning mechanism to move the head with respect to the magnetic recording medium by a distance which depends on the gap selected. The packing density of tracks on the recording medium determines which gap is selected for use.

公开(公告)号：EP0126371A3

公开(公告)日：1986-11-26

申请号：EP84105165

申请日：1984-05-08

Applicant: TOKYO ELECTRIC CO., LTD.

Inventor： Saito, Shunji

IPC: G11B19/20 ,  G11B05/55 ,  G11B21/02

CPC classification number: G11B19/20 ,  G11B5/553

Abstract: A floppy disk drive apparatus includes a control signal generating circuit (38) for generating a step signal and a direction instruction signal, head driving section (12, 40, 42, 46, 48) for driving a magnetic head in the radial direction of a floppy disk, and a detector circuit (22, 30, 32, 34, 36, 50) for generating an output signal when the magnetic head locates in the outer limit location of the floppy disk. The detector circuit (22, 30, 32, 34, 36, 50) is inhibited from generating an output signal in response to the direction instruction signal generated for driving the magnetic head in an inner direction of the floppy disk.

公开(公告)号：EP0109154A3

公开(公告)日：1985-05-29

申请号：EP83305529

申请日：1983-09-20

Applicant: CIPHER DATA PRODUCTS, INCORPORATED

Inventor： Barton, William M., Jr. ,  Murphy, John F. ,  Offerman, Karl B. ,  Fisher, Richard G.

IPC: G11B15/66 ,  G11B15/18 ,  G11B05/55

CPC classification number: G11B5/5504 ,  G11B15/1883 ,  G11B15/67521

Abstract: A drive for a tape cartridge having an access door along one side edge thereof. The drive includes a housing having a front panel and an elongate tray dimensioned to have the cartridge inserted endwise thereon. The tray is supported within the housing for longitudinal movement from a retracted position in which the tray is substantially contained within the housing to an extended position in which a portion of the tray extends through a slot in the front panel of the housing. A mechanism is provided for opening the access door of the cartridge while the cartridge is supported on the tray and the tray is being moved from its extended position to its retracted position. Another mechanism is provided for moving a read/write head and a capstan drive within the housing between operative engagement and disengagement with the cartridge after the cartridge has been inserted onto the tray and the tray has been moved to its retracted position.

公开(公告)号：EP0034938A3

公开(公告)日：1981-12-16

申请号：EP81300740

申请日：1981-02-23

Applicant: NORTHERN TELECOM INC.

Inventor： Oliver, Theodore Arthur

IPC: G11B05/58 ,  G11B21/10 ,  G11B05/55

CPC classification number: G11B5/5965

Abstract: An embodded servo track following system and method for positioning a transducer (10) relative to a storage medium (13) to read and write data on the medium such as a magnetic disc. The system includes positioning means (15) energizable for moving the transducer to preselected recording positions relative to the storage medium. A plurality of side-by-side closely spaced alternately arranged odd and even servo tracks are embedded or recorded on the medium such that a pair of the odd and even servo tracks identifies a preselected position or informational data track on the medium therebetween. Each of the odd and even tracks generates a waveform having a net DC component. The DC component of the odd and even tracks are equal in magnitude but opposite in polarity such that the DC components of the odd and even tracks cancel each other when the transducer is disposed therebetween. Servo control circuit means is provided for sensing the output of the transducer and selectively energizing the positioning means to null the output of the transducer and thereby centre the transducer between a preselected odd and even track pair (e.g. on line 36).

Abstract translation: 一种用于相对于存储介质（13）定位换能器（10）以在诸如磁盘的介质上读取和写入数据的体现的伺服轨道跟随系统和方法。 该系统包括可激励的定位装置（15），用于将换能器相对于存储介质移动到预选的记录位置。 多个并排紧密间隔的交替布置的奇数和偶数伺服磁道被嵌入或记录在介质上，使得一对奇数和偶数伺服磁道识别其间的介质上的预选位置或信息数据轨道。 奇数和偶数轨道中的每一个产生具有净DC分量的波形。 奇数和偶数轨道的直流分量的幅度相等，但极性相反，使得当换能器置于其间时，奇数和偶数轨道的直流分量相互抵消。 提供伺服控制电路装置，用于感测换能器的输出并选择性地激励定位装置以使换能器的输出为零，从而将换能器定位在预选的奇数和偶数轨道对之间（例如在线36上）。

公开(公告)号：EP0262690A3

公开(公告)日：1988-09-28

申请号：EP87114637

申请日：1983-05-06

Applicant: DIGITAL EQUIPMENT CORPORATION

Inventor： Sidman, Michael D.

IPC: G11B05/55 ,  G11B05/596

CPC classification number: G11B5/5965 ,  G11B5/5534

Abstract: A method for use in a magnetic disk drive of the type in which a disk assembly has a dedicated servo surface containing circular tracks of dedicated servo signals (75) and data surfaces containing circular data tracks divided into sectors each of which includes a data field (256) and a servo field (254) containing embedded servo signals, a dedicated servo signal detector for detecting servo signals (75) on said dedicated surface, an embedded signal detector for detecting embedded servo signals (254) on a data surface and a head positioning system for positioning a read/write head over a selec­ted data track. The entire output of the embedded signal detector is combined with the high-frequency components of the output of the dedicated signal detec­tor to produce a composite track error signal and the head positioning system responds to the composite track error signal to maintain the read/write head over the selected data track.

公开(公告)号：EP0221762A3

公开(公告)日：1988-07-27

申请号：EP86308401

申请日：1986-10-29

Applicant: CIPHER DATA PRODUCTS, INC.

Inventor： Barton, William M., Jr. ,  Murphy, John F. ,  Jacobs, Lynn C. ,  McGee, Jeffrey S. ,  Netzeband, William F. ,  Johnson, Roger S.

IPC: G11B15/67 ,  G11B23/107 ,  G11B05/55

CPC classification number: G11B15/67 ,  G11B5/5521 ,  G11B23/107

Abstract: A transport (20) for a rectangular tape cartridge (22) enclosing a supply reel (24) having a web of magnetic tape wound thereabout terminating in a free end attached to a leader block. The illustrated embodiment of the transport (20) is designed to fit within the computer industry standard 5 ¼-inch form factor and utilizes the ½-inch tape cartridge defined in Proposed American National Standard X3B5/85-075. An elongate rectangular housing (38) has internal mechanisms for supporting the tape cartridge therein and referencing the cartridge off its side surfaces. The cartridge (22) is manually inserted into the housing (38) through a slot in a face panel extending across a transverse end of the housing (38). Electro-mechanical assemblies lock the cartridge in place and complete the loading sequence by engaging a drive chuck with the hub of the supply reel (24), extracting the leader block from the cartridge (22), and pulling the leader block to the take-up (219) hub to thread the tape along a tape path. A gear driven articulated arm (168) has an outer end which is guided along a hook-shaped track (162) and carries the leader block into engagement with a receptacle (224) in the take-up hub (219). Precision transverse movement of a magnetic head (226) in the tape path is accomplished by a stepper motor coupled to a band drive through a worm gear reduction.

公开(公告)号：EP0219116A3

公开(公告)日：1988-03-30

申请号：EP86114270

申请日：1986-10-15

Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA

Inventor： Kawada, Junji Ryoden Engineering

IPC: G11B05/55 ,  G11B21/08

CPC classification number: G11B5/5521 ,  Y10T74/18832

Abstract: A head positioning device used for a disc type memory system comprises a head (2) being movable by a metallic band (7), which is extended between a capstan (5) and an idle roller (6) in a loop form and is wound around the capstan with at least one turn.

公开(公告)号：EP0159668A3

公开(公告)日：1987-05-13

申请号：EP85104695

申请日：1985-04-18

Applicant: HITACHI, LTD.

Inventor： Seki, Gen ,  Hayashi, Seiichi

IPC: G11B05/48 ,  G11B05/54 ,  G11B05/55 ,  G11B05/58

CPC classification number: G11B5/58 ,  G11B5/4833 ,  G11B5/54

Abstract: A magnetic head positioning apparatus includes a chassis, a driving device provided on the chassis, a guide member provided on the chassis, a carrier movably provided on the guide member, a first metallic head support mounted on the carrier and adapted to support a first magnetic head, and a second metallic head support mounted on the carrier and adapted to support a second magnetic head which is disposed to oppose the first magnetic head. A coupling member is formed on the first head support and directly connected to the driving device. By moving the coupling member by the operation of the driving device, the carrier is moved along the guide member through the first head support. Thus, it is possible for the magnetic head positioning apparatus to possess excellent resistance to environmental changes and to effect highly accurate positioning of the magnetic heads.

公开(公告)号：EP0087300A3

公开(公告)日：1984-07-18

申请号：EP83300875

申请日：1983-02-21

Applicant: BURROUGHS CORPORATION (a Michigan corporation)

Inventor： Donkin, Charles William

IPC: G11B21/08 ,  F16C31/04 ,  G11B05/55

CPC classification number: F16C31/04 ,  G11B5/5521 ,  G11B21/08

Abstract: A rotary actuator is provided for use as part of a servomechanism for positioning one or more data recording and/or recovering heads over selectable radii on one or more rotating data storage discs, the actuator 10 comprising a head arm 24 pivoted to rotate with a shaft 20 held between bearings 18 32 in a yoke 12, the actuator 10 being characterised by one of the bearings 18 being a composite bearing allowing both axial and rotational movement of the shaft 20 without play and by the other bearing 32 being a rotary bearing, the two bearings 18,32, co-operating to fix the axial position of the shaft 20 whilst allowing free rotation and axial movement due to dimensional changes whenever the axial force exceeds a predetermined limit, thereby avoiding rotary bearing binding or undue play attendant upon prior art designs.