公开(公告)号：ID23492A

公开(公告)日：1997-03-13

申请号：ID990591

申请日：1996-07-25

Applicant: DISCOVISION ASS

Inventor： HOLLEN ZDENEK A ,  MURPHY KENT T ,  MEYER RUSSELL A ,  RUSSELL ROBERT C ,  MONSEN CHRISTOPHER J ,  DEPUY CHARLES ,  HEATON HERBERT E ,  HOOVER DOUGLAS E ,  KNORR CHRISTOPHER A ,  ANDERSON GARY ,  PAPIERNIK DAVID L ,  HALL HOLLIS O'NEAL II ,  LOUIE JAMES K ,  TAYLOR WILHEHLM ,  GRASSENS LEONARDUS J

IPC: G11B7/00 ,  B23P21/00 ,  G01M11/00 ,  G02B7/00 ,  G11B7/085 ,  G11B7/09 ,  G11B7/22 ,  G11B11/105 ,  G11B21/02 ,  B25B27/24

Abstract: A method and apparatus for manufacturing information storage devices. The apparatus includes a bearing insertion device, a lens insertion device, a coarse coil gluing tool, a spring gluing tool, a device for gluing pole pieces, a pentaprism insertion and inspection tool, a constants and transfers test, an optics module alignment device, wedge, microprism and beamsplitter insertion devices, a read channel alignment test, a mass balance attachment devise, a position sensor alignment tool, a device for the attachment of focus and radial coils, a quality control test for testing an optical storage device prior to insertion of the objective lens, and a servo system test. The method includes steps for manufacturing information storage devices with increased quality and efficiency.

公开(公告)号：CA2167549A1

公开(公告)日：1996-07-26

申请号：CA2167549

申请日：1996-01-18

Applicant: DISCOVISION ASS

Inventor： CRUPPER RANDOLPH SCOTT ,  DAVIS MARVIN BENJAMIN ,  GETREUER KURT WALTER ,  GRASSENS LEONARDUS J ,  HALL HOLLIS O'NEAL II ,  LEWIS DAVID E ,  SCHELL DAVID LOUIS

IPC: G11B7/0045 ,  G02B7/04 ,  G11B5/55 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105 ,  G11B15/467 ,  G11B17/04 ,  G11B19/28 ,  G11B20/10 ,  G11B20/12 ,  G11B21/02 ,  G11B21/10 ,  G11B25/04 ,  G11B33/08 ,  H02K41/035 ,  H03B5/08 ,  H03B5/12 ,  G11B20/18

Abstract: An optical disc system including a focusing mechanism and a tracking mechanism, wherein the mechanisms are controlled by feedback loops having electronic circuits for generating a servo error signals. The error signals are communicated in the feedback loop for effecting corrections of the focusing mechanism and the tracking mechanism. The optical disc system is provided with digital lead/lag compensation circuit assembly including a servo loop having servo loop transfer function and an error signal. The circuit assembly includes a motor or actuator having a mechanical resonance frequency being less than a predetermined sampling frequency and a compensation circuit for stabilizing the servo loop. The error signal of the servo loop is sampled at the predetermined sampling frequency. Normalization of the error signals to the information signal occurs during sampling. The compensation circuit has a compensation transfer function including a single lead and a complex lag for producing a notch filter with a notch. The compensation transfer function is formulated so that the notch occurs at approximately one half the predetermined sampling frequency thereby reducing amplitude of the mechanical resonance frequency in the servo loop transfer function. The optical disc system also includes a mechanical isolator for vibration isolation and accommodation of thermal expansion, an oscillator with a tank circuit having an increased resistance, an improved focus capture system, and means for identifying blank sectors in a storage medium.