Patent
Focusing a light beam more than thirty focal depths from the aplanatic point with a plano-convex lens
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TLDR
In this article, a plano-convex lens was used to focus the radiation beam to a point at least 30 focal depths away from an aplanatic point of the planoconveX lens.Abstract:
A device is described for optically scanning a record carrier with a radiation beam having a high numerical aperture. The radiation beam is focused on the record carrier by means of an objective lens and a plano-convex lens. The plano-convex lens has a gap with the record carrier of several tens of micrometers. It focuses the radiation beam to a point at least 30 focal depths away from an aplanatic point of the plano-convex lens. As a consequence, the lens has a relatively large tolerance for sideways movements.read more
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Patent
Optical pick-up apparatus
Tohru Kimura,Kohei Ota +1 more
TL;DR: An optical pickup apparatus for conducting recording and/or reproducing information of an optical information recording medium, comprises a light source; a converging optical system having an objective lens; and a photo-detector as discussed by the authors.
Patent
Optical Scanning Device
Gert W. t'Hooft,Frank Jeroen Pieter Schuurmans,Bernardus Hendrikus Wilhelmus Hendriks,Mohammed Meftah +3 more
TL;DR: In this paper, a wavefront aberration of the radiation beam is compensated by adjusting the fluid meniscus configuration to adjust the angular displacement of the wavefront in the input radiation beam path.
Patent
Optical information processing system using optical aberrations and information medium having recording layer protected by transparent layer having thickness irregularity
TL;DR: In this article, a thickness servo system using optical aberrations is presented, which includes an objective lens facing a recording layer covered with a transparent layer accompanying thickness irregularity.
Patent
Optical element, optical head, optical recording reproducing apparatus and optical recording/reproducing method
Hidenori Wada,Tetsuo Saimi,Daisuke Ogata,Seiji Nishino,Hiroaki Yamamoto,Shinichi Kadowaki,Yoshiaki Komma +6 more
TL;DR: In this article, an optical element with which an optical head can be configured, in which there is little deterioration of the correctional effect when the objective lens shifts, as well as an optical recording/reproducing apparatus using such an optical elements.
Patent
Information recording medium, reproducing apparatus thereof and recording apparatus thereof
Tetsuya Kondo,Kenji Oishi +1 more
Abstract: An information recording medium 1 at least comprises a substrate 13 having a microscopic pattern 20, which is constituted by a shape of continuous substance of approximately parallel grooves formed with a groove section G and a land section L alternately, a recording layer 12 formed on the microscopic pattern 20 and a light transmission layer 11 formed on the recording layer. The microscopic pattern 20 is formed so as to satisfy a relation of P<λ
References
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Patent
Optical recording system employing a solid immersion lens
TL;DR: An optical recording system including a read/write optical assembly including an objective lens for reading or writing from an optical medium including a solid immersion lens disposed between the objective lens and having a surface closely spaced from the recording medium as discussed by the authors.
Patent
Optical disk data storage system with radiation-transparent air-bearing slider
TL;DR: In this article, a super-hemispherical solid immersion lens (SIL) is used to focus the light from the disk drive's light source to a point on the ABS.
Patent
optical pickup apparatus
TL;DR: In this paper, an optical pickup apparatus is constructed of an objective lens for condensing a light beam emitted from a light source toward an optical recording medium, and a convex lens arranged between the recording medium and the objective lens.
Patent
Optical flying head with solid immersion lens having raised central surface facing media
Neville K. S. Lee,John S. Berg +1 more
TL;DR: An air bearing assembly for an optical drive carries a solid immersion lens (SIL) having a bottom surface facing the disk contoured such that a central region (16c) where the optical path exits the bottom surface is closest to the recording media regardless of perturbations in the attitude of the air bearing and neighboring points on the surface (16b) surrounding the central region recede for clearance but function at least partly as an air bearing.
Patent
Flying head with solid immersion lens partially mounted on a slider
TL;DR: In this paper, the authors present a head for a disk drive for reading data from and/or writing data to an optical recording medium, having a slider with a channel surface and an air-bearing surface, an optical clear path through the slider, a solid immersion lens mounted at least partially within the slider and an objective lens mounted to the slider.