公开(公告)号：WO1985001806A1

公开(公告)日：1985-04-25

申请号：PCT/US1984001671

申请日：1984-10-17

Applicant: MEMOREX CORPORATION

Inventor： MEMOREX CORPORATION ,  EL-SADI, Ashraf, I.

IPC: G05B05/01

CPC classification number: G05D3/14 ,  G11B5/59622 ,  G11B21/106 ,  H03H11/1217

Abstract: A novel technique and associated arrangement for determining the noise-free value of a system parameter which is time variable and has a noise component as detected. The technique involves processing the noise-including value and passing it through "Second Order/Summing" filter means (FF). The technique is particularly useful with the "track-following servo" in a high density disk file to secure superior head-displacement error values which are more noise-free. A pair of first values input to a summer (Sm) are secured by detecting motor current sense voltage (Vi) integrating it with respect to time and passing the result through a pair of novel "second order filter" means --one band-pass (F1), the other low-pass (F2); while also securing a third input to the summer (Sm) by detecting a position error signal voltage (Vxi), including noise components (M(s)) in the usual manner and passing it through a "second order low-pass" filter (F3); then algebraically summing these to secure a relatively noise-free position error signal (Vxo). Thus, the summing filter array gates the position-error voltage (Vxi) but attenuates the (mechanical) noise component (M(s)).

公开(公告)号：WO1985000476A1

公开(公告)日：1985-01-31

申请号：PCT/US1984001076

申请日：1984-07-11

Applicant: MEMOREX CORPORATION

Inventor： MEMOREX CORPORATION ,  MORRIS, Frank, I.

IPC: H02K35/04

CPC classification number: H02K41/0356 ,  G11B21/02

Abstract: A disc drive arrangement including read/write head actuator driven by an improved voice coil motor (35), having a housing (31), or other flux-return structure, that is fabricated and processed of "magnetic ductile iron" and adapted to exhibit improved magnetic characteristics and operation (increased working flux, increased efficiency, and more effective power/acceleration for a given current), thus decreasing access time and being more readily machined than cast steel or similar conventional metals.

公开(公告)号：WO1985000459A1

公开(公告)日：1985-01-31

申请号：PCT/US1984001019

申请日：1984-06-29

Applicant: MEMOREX CORPORATION

Inventor： MEMOREX CORPORATION ,  ROSE, Andrew, M.

IPC: G11B21/10

CPC classification number: G11B5/59627

Abstract: An apparatus for improving the positioning accuracy of a tracking arm in a disc system and eliminating run-out. The apparatus has acceleration apparatus (20) for moving the arm, braking apparatus (84) to brake the movement of the arm, apparatus for detecting run-out (96), and responsive apparatus (88) for removing the braking current in the event run-out is detected.

公开(公告)号：WO1984000436A1

公开(公告)日：1984-02-02

申请号：PCT/US1983001057

申请日：1983-07-14

Applicant: MEMOREX CORPORATION

Inventor： MEMOREX CORPORATION ,  IQBAL, Sikandar

IPC: G11B05/70

CPC classification number: G11B5/7013 ,  Y10S428/90 ,  Y10T428/31855

Abstract: Improved aqueous magnetic coating composition employing a polyacrylic latex polymer as a dispersant. As preferred embodiments, the composition further comprises a polymeric binder having both hard and soft components, as well as the inclusion of flow agents, antifoaming agents, wetting agents and lubricants.

Abstract translation: 使用聚丙烯酸胶乳聚合物作为分散剂的改进的水性磁性涂料组合物。 作为优选实施方案，组合物还包含具有硬组分和软组分的聚合物粘合剂，以及包含流动剂，消泡剂，润湿剂和润滑剂。