公开(公告)号：US3609723A

公开(公告)日：1971-09-28

申请号：US3609723D

申请日：1969-12-24

Applicant: IBM

Inventor： ALSTAD JOHN K ,  WIITALA JAMES R

IPC: G02B26/06 ,  G02F1/09 ,  G02F1/315 ,  G11B11/10 ,  G11B11/105 ,  G02F1/22

CPC classification number: G11B11/10 ,  G02B26/06 ,  G02F1/09 ,  G02F1/315 ,  G11B11/10547

Abstract: Magnetic information is converted to optical signals by placing a coupled piezoreflective-magnetostrictive film layer between the information-containing medium and a light source; and the pattern of magnetization on the medium induces a similar pattern of elongation or contraction in the magnetostrictive film which imparts a strain at corresponding locations in the piezoreflective film and a resulting change in reflectivity of the film. Accordingly, the reflectance of light incident upon the piezoreflective film surface can be sensed to determine the presence or absence of magnetization at particular locations on the information-containing medium.

公开(公告)号：US3498837A

公开(公告)日：1970-03-03

申请号：US3498837D

申请日：1967-01-11

Applicant: IBM

Inventor： ALSTAD JOHN K ,  BATE GEOFFREY ,  MILLER RICHARD C ,  MORRISON JOHN R ,  SPELIOTIS DENNIS E

IPC: C23C14/00 ,  G11B5/72 ,  C23C13/02 ,  C22C39/14

CPC classification number: G11B5/72 ,  C23C14/0021 ,  Y10S428/90 ,  Y10T428/31678

公开(公告)号：US3665431A

公开(公告)日：1972-05-23

申请号：US3665431D

申请日：1970-06-25

Applicant: IBM

Inventor： ALSTAD JOHN K ,  ARMITAGE JOHN D JR ,  BATE GEOFFREY

IPC: G02F1/09 ,  G11B11/105 ,  G11B5/30

CPC classification number: G11B11/10547 ,  G02F1/09

Abstract: Disclosed herein is a new magneto-optic transducer which orients the transfer film non-parallel to the record storage medium with only an edge of the transfer film adjacent the record storage medium. The magneto-optic transducer also provides a reflecting surface adjacent the surface of the record storage medium on either side of the transfer film so that the magneto-optic Kerr or Faraday Effect may be utilized with the transducer. Furthermore, the reflecting surface permits a focused light beam to be directed near the edge of the transfer film adjacent the storage medium.

公开(公告)号：US3453646A

公开(公告)日：1969-07-01

申请号：US3453646D

申请日：1965-05-26

Applicant: IBM

Inventor： SPELIOTIS DENNIS E ,  MORRISON JOHN R ,  ALSTAD JOHN K ,  BATE GEOFFREY

IPC: G11B5/00 ,  G11B5/09 ,  G11B11/105 ,  G11B11/11 ,  G11C13/06 ,  G01D15/12

CPC classification number: G11C13/06 ,  G11B5/00 ,  G11B5/09 ,  G11B11/10532 ,  G11B11/11 ,  G11B2005/0021