公开(公告)号：JPS62170085A

公开(公告)日：1987-07-27

申请号：JP24332486

申请日：1986-10-15

Applicant: IBM

Inventor： WANG SHERMAN SHEAU-MING ,  DISTEFANO THOMAS HERMAN ,  HOLLIS JR ,  JOHNSON MARK

IPC: G11B23/30 ,  G11B5/58 ,  G11B5/596 ,  G11B5/74 ,  G11B5/82 ,  G11B5/84 ,  G11B23/36

公开(公告)号：DE3175092D1

公开(公告)日：1986-09-18

申请号：DE3175092

申请日：1981-03-06

Applicant: IBM

Inventor： BRADY MICHAEL JOHN ,  GREGOR LAWRENCE VINCENT ,  JOHNSON MARK

IPC: F16C32/00 ,  G02B6/35 ,  G02B26/02 ,  G02B26/08 ,  H02K44/02 ,  G02B6/24 ,  G02F1/00

公开(公告)号：DE3478840D1

公开(公告)日：1989-08-03

申请号：DE3478840

申请日：1984-12-11

Applicant: IBM

Inventor： JOHNSON MARK

IPC: G01S17/02 ,  G01B11/00 ,  G01V8/12 ,  H03K17/78 ,  H03K17/94 ,  H03K17/968 ,  H03K17/945

Abstract: An LED (10) is forward biased to emit light, some of which is reflected back onto itself when one of a series of reflective members (16) passes in proximity to the LED. This varies the impedance of the LED, and the variation is detected by a transistor (22) to produce an output signal (Vs).

公开(公告)号：CA1159916A

公开(公告)日：1984-01-03

申请号：CA366021

申请日：1980-12-03

Applicant: IBM

Inventor： JOHNSON MARK

IPC: G02B26/10 ,  G02B6/12 ,  G02B6/122 ,  G02B6/124 ,  G02B26/02 ,  G02B26/08 ,  G02F1/065 ,  G02F1/313 ,  G02B5/14 ,  H01P3/00

Abstract: CONTROLLABLY DEFORMED ELASTIC WAVEGUIDE ELEMENTS An elastic two dimensionally guiding waveguide is controllably stretched between two or more different configurations, the different configurations being such that wave energy takes different paths through the waveguide at each of the two or more different configurations. The paths are different because wave energy which propagates along and between two parallel boundary surfaces or which follows a surface travels along a geodesic path and the geodesic path can be changed by stretchably deforming the surface shape in a suitable manner. In one embodiment an optically transparent sheet of rubber-like material is stretched into a depression or hole within a substrate using controlled pneumatic forces. Many different active functions may be implemented using this principle, including switching, variable focussing, modulation, scanning and deflection. Y0979-0844

公开(公告)号：DE3475020D1

公开(公告)日：1988-12-08

申请号：DE3475020

申请日：1984-11-23

Applicant: IBM

Inventor： JOHNSON MARK

IPC: G11B5/55 ,  G11B7/09 ,  G11B21/08 ,  G11B21/10 ,  G11B5/596

Abstract: The radial position of a transducer (72) used to read and/or write information into or from a spinning optical or magnetic information storage disk (66) is servo controlled by an optical doppler interferometer (80) mounted at least in part for common movement with the transducer (72). The optical doppler interferometer (80) measures the instantaneous linear velocity (V) of the information storage disk (66) at the position of the transducer (72) or at a fixed relative position with respect to the transducer (72), and the position of the transducer (72) is controlled so as to make the measured instantaneous linear velocity (V) follow a reference signal appropriate for the desired information storage track. A servo pattern is not required on the storage disk (66).

公开(公告)号：DE3166216D1

公开(公告)日：1984-10-31

申请号：DE3166216

申请日：1981-01-08

Applicant: IBM

Inventor： JOHNSON MARK

IPC: G02B26/10 ,  G02B6/12 ,  G02B6/122 ,  G02B6/124 ,  G02B26/02 ,  G02B26/08 ,  G02F1/065 ,  G02F1/313 ,  G02B5/14 ,  G02F1/01 ,  G02B7/26

Abstract: An elastic two dimensionally guiding waveguide (30, 60) is controllably stretched between two or more different configurations, the different configurations being such that wave energy takes different paths (40,42) through the waveguide at each of the two or more different configurations. The paths are different because wave energy which propagates along and between two parallel boundary surfaces or which follows a surface travels along a geodesic path and the geodesic path can be changed by stretchably deforming the surface shape in a suitable manner. In one embodiment an optically transparent sheet of rubber-like material is stretched into a depression or hole (34, 50) within a substrate (32, 66) using controlled pneumatic forces. Many different active functions may be implemented using this principle, including switching, variable focussing, modulation, scanning and deflection.

公开(公告)号：DE3684288D1

公开(公告)日：1992-04-16

申请号：DE3684288

申请日：1986-12-02

Applicant: IBM

Inventor： WANG SHERMAN SHEAU-MING ,  DISTEFANO THOMAS HERMAN ,  HOLLIS JR ,  JOHNSON MARK

IPC: G11B23/30 ,  G11B5/58 ,  G11B5/596 ,  G11B5/74 ,  G11B5/82 ,  G11B5/84 ,  G11B23/36

Abstract: A method and apparatus for format patterning magnetic recording media with servo-control patterns is disclosed herein. The method comprises the steps of applying the control pattern using a resist in liquid form onto the media material by conventional applying techniques. A layer of a thin metallic film is then deposited over the resist and uncovered substrate areas. The resist and its overlayered metal is then removed using a liftoff technique by dissolving the resist in its particular solvent. A control pattern of deposited metallic film remains in those non-resist areas. In the alternative, the process can also use an etching bath to create the servo control pattern.

公开(公告)号：DE3483459D1

公开(公告)日：1990-11-29

申请号：DE3483459

申请日：1984-11-09

Applicant: IBM

Inventor： DISTEFANO THOMAS HERMAN ,  JOHNSON MARK

IPC: G02B26/12 ,  H04N1/047 ,  H04N1/113 ,  H04N1/12 ,  G02B26/10

Abstract: The apparatus includes a primary scanner including laser light sources (10B, 10C) and rotating polygonal mirror (12), which produces a scanning optical beam on a drum (16), and a photoresponsive error sensor (22, 24, 28) which effectively measures over the scan path the successive differences between the actual position of the scanning beam and the desired position of the scanning beam and produces error signal. A secondary scanner (30, 32) is connected to the error sensor for response to the error signals to dynamically correct the position of the scanning beam during the course of the scan. The primary scanner provides a main optical scanning beam and an auxiliary optical scanning beam (20C) traversing substantially the same optical path. The error sensor includes a graticule mask (22) having a substantially uniform optical density along the desired scan path and a graded optical density transverse to the desired scan path of the auxiliary scanning beam.

公开(公告)号：DE3470241D1

公开(公告)日：1988-05-05

申请号：DE3470241

申请日：1984-06-22

Applicant: IBM

Inventor： JOHNSON MARK

IPC: G11B23/30 ,  G11B5/55 ,  G11B5/596 ,  G11B5/82 ,  G11B21/08 ,  G11B21/10 ,  G11B23/42

Abstract: A servo pattern (70) of detectable marks is so disposed on a record disk (66) that when the disk is rotated past a sensor device (72) for sensing the marks, there is a plurality of nested (e.g. substantially concentric) paths along which the rate of sensing the marks is individual to each path whereby it is possible to define a record track (68) on the disk by reference to a selected one of the paths. … The servo pattern (70) does not interfere with or use any of the recording capacity of the record medium (74) on the disk. The servo pattern is sensed by a sensor (72) different from any transducer (12) used to access the record medium. The record medium can be a conventional magnetic layer and the servo pattern can be formed of optically reflective or non-reflective spots overlying or underlying the magnetic record medium. … The sensor (72) is mounted for common radial movement with the transducer (12). As the record disk spins, the sensor produces an output signal from which is derived a mark sensing rate signal. Each record track (68) is defined by an individual mark sensing rate. A servo control system positions the transducer (12) so that the mark sensing rate is maintained at the rate defining a desired record track (68).