Optical element, optical head and signal reproducing method
A technology of optical components and optical heads, applied in the field of optical heads, can solve the problems of impossible high-speed reading and slow movement of the cantilever
Inactive Publication Date: 2005-02-02
SONY CORP
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Problems solved by technology
However, high-speed reading is not possible due to the slow movement of the cantilever
Method used
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[0029] refer to Figures 1 to 4 , which illustrate multiple embodiments of optical elements, where each optical element has a conductive element embedded in a hemispherical mirror. A hemispherical mirror is a typical lens capable of near-field phase detection using SIL.
[0030] For example figure 1 In the optical element shown, a conical metal piece M is embedded in the center of the optical axis of the hemispherical mirror L as a conductive element. figure 2 The optical element shown has a metal part M embedded as a conductive element in its hemispherical mirror L, the diameter of which gradually decreases toward the end of the hemispherical mirror L in a stepwise manner.
[0031] image 3 Shown is an embodiment with an optical element with a diameter of several hundred nm embedded in a hemispherical mirror L with a fine metalloid S (for example Si). Figure 4 Shown is an embodiment of an optical element in which a conical transparent conductive material T is embedded i...
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Abstract
An optical element is provided in which in a lens surface substantially perpendicular to the optical axis of the lens, there is embedded a conductive member whose diameter or width is smaller than the diameter of an optical spot incident upon the lens surface. The optical element is used in an optical head which reads a signal by illuminating an optical recording medium with a reading light. The basic principle of this optical head is such that a subtle phase change of the light is detected which is caused by the electromagnetic interaction between the conductive member embedded in the optical element and a conductive material on the surface of the optical recording medium. For example, the interference between return light beams from the optical recording medium is used to read a signal. Alternately, a high frequency current is supplied to the conductive material and a signal synchronous with the high frequency is extracted to detect the interaction between the conductive material on the optical recording medium and the conductive member, to thereby read a signal recorded in the optical recording medium.
Description
technical field [0001] The invention relates to a new type of optical element capable of detecting marks smaller than a light spot, an optical head using the optical element and a signal playback method using the optical head. Background technique [0002] In the field of optical recording, it is required to record signals at high density. To meet such demands, various recording and reproducing methods have been proposed. [0003] For example, in the technical field of an optical head that illuminates an optical recording medium with a reading beam to read a signal, a solid immersion lens (hereinafter denoted as "SIL") or a solid immersion mirror (hereinafter denoted "SIM") as an optical element that records and / or reads signals at high densities, and employs a near-field fringe beam to read signals with a higher numerical aperture (NA) than before. [0004] On the other hand, in order to measure the shape of an object to be measured, it has been proposed to provide a meta...
Claims
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IPC IPC(8): G02B13/00G02B3/00G02B13/24G02B17/08G11B5/02G11B7/00G11B7/005G11B7/12G11B7/122G11B7/13G11B7/135G11B7/1356G11B7/1372G11B7/1374G11B7/1387G11B11/105
CPCG11B7/1356G01Q80/00G01Q60/22B82Y10/00G11B7/1387G11B7/005G11B7/1203B82Y35/00G11B2007/13725B82Y20/00G11B11/10543G11B7/122G11B7/127G11B7/1374G11B21/21
Inventor 渡边健次郎玉田仁志
Owner SONY CORP