公开(公告)号：US3926500A

公开(公告)日：1975-12-16

申请号：US52896574

申请日：1974-12-02

Applicant: IBM

Inventor： FROSCH ALBERT ,  KORTH HANS ERDMANN

IPC: G02B21/00 ,  G02B21/08 ,  G02B27/58 ,  G02B21/06 ,  G05D25/00

CPC classification number: G02B27/0075 ,  G02B21/082 ,  G02B27/58

Abstract: In order to increase the depth of focus of a high resolution microscope objective a diaphragm having small openings 25, 26 is rotatably mounted in plane 13 which is conjugate to object plane 12. Object 11 is illuminated (scanned) through semi-transparent mirror 19 and said diaphragm in such a way that light passing through said openings is sharply focused only on areas lying near to, or in object plane 12 within the depth of focus range of objective 2. Only light scattered or reflected from such areas passes through said openings substantially without losses and after passing through lens 20 provides a clear image of high contrast of those areas of object 11 which lie within the depth of focus of lens 2. Light coming (reflected, scattered) from all other areas of object 11 lying outside the depth of focus is subject to substantial losses so that no image appears at 22. If object 11 is moved cyclically with say 50 cps vertically to plane 12 so that all object points pass at least once through the depths of focus range of lens 2 a clear image of high contrast of all object points is visible at 22.

公开(公告)号：CH634656A5

公开(公告)日：1983-02-15

申请号：CH1243078

申请日：1978-12-05

Applicant: IBM

Inventor： KORTH HANS ERDMANN ,  SCHEDEWIE FRANZ

IPC: G01J3/36 ,  G01J3/22 ,  G01J3/28

公开(公告)号：AU6647086A

公开(公告)日：1987-06-18

申请号：AU6647086

申请日：1986-12-12

Applicant: IBM

Inventor： KORTH HANS ERDMANN

IPC: G02B6/00 ,  G02B17/08 ,  G11B7/08 ,  G11B7/12 ,  G11B11/105 ,  G11B7/135

Abstract: In an optical storage system where an information bearing surface (1) moves relative to a read/write head the latter consists of a transparent body (6) in which light beams sent to and from the surface (1) are guided by multiple internal reflections. Beam shaping and focussing is effected by optical elements (21-23; 26) integrated in the surface of the body at the locations where the internal reflections occur. A distortion free imaging system is obtained with two series-arranged aspheric reflection surfaces (26a, 26b) which focus the beam on the information bearing surface 1. The separation of the input and the reflected beam paths is achieved with a polarizing beam splitter (24) and an associated quarter-wave layer (25). For readout of a magneto-optic information bearing surface a nonperfect polarizing beam splitter (41) is used in connection with a differential detection scheme to increase the signal to noise/ratio.

公开(公告)号：AU586720B2

公开(公告)日：1989-07-20

申请号：AU6647086

申请日：1986-12-12

Applicant: IBM

Inventor： KORTH HANS ERDMANN

IPC: G02B6/00 ,  G02B17/08 ,  G11B7/08 ,  G11B7/12 ,  G11B11/105 ,  G11B7/135

Abstract: In an optical storage system where an information bearing surface (1) moves relative to a read/write head the latter consists of a transparent body (6) in which light beams sent to and from the surface (1) are guided by multiple internal reflections. Beam shaping and focussing is effected by optical elements (21-23; 26) integrated in the surface of the body at the locations where the internal reflections occur. A distortion free imaging system is obtained with two series-arranged aspheric reflection surfaces (26a, 26b) which focus the beam on the information bearing surface 1. The separation of the input and the reflected beam paths is achieved with a polarizing beam splitter (24) and an associated quarter-wave layer (25). For readout of a magneto-optic information bearing surface a nonperfect polarizing beam splitter (41) is used in connection with a differential detection scheme to increase the signal to noise/ratio.

公开(公告)号：BR8605867A

公开(公告)日：1987-08-25

申请号：BR8605867

申请日：1986-12-01

Applicant: IBM

Inventor： KORTH HANS ERDMANN

IPC: G02B6/00 ,  G02B17/08 ,  G11B7/08 ,  G11B7/12 ,  G11B11/105

Abstract: In an optical storage system where an information bearing surface (1) moves relative to a read/write head the latter consists of a transparent body (6) in which light beams sent to and from the surface (1) are guided by multiple internal reflections. Beam shaping and focussing is effected by optical elements (21-23; 26) integrated in the surface of the body at the locations where the internal reflections occur. A distortion free imaging system is obtained with two series-arranged aspheric reflection surfaces (26a, 26b) which focus the beam on the information bearing surface 1. The separation of the input and the reflected beam paths is achieved with a polarizing beam splitter (24) and an associated quarter-wave layer (25). For readout of a magneto-optic information bearing surface a nonperfect polarizing beam splitter (41) is used in connection with a differential detection scheme to increase the signal to noise/ratio.