Optical lens system comprising two more than half-spherical lenses
An optical lens and lens technology, applied in optical head manufacturing, optical recording/reproduction, optics, etc., can solve the problems of laborious setting of positioning surface and difficulty in error range
Inactive Publication Date: 2004-11-03
KONINKLIJKE PHILIPS ELECTRONICS NV
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Problems solved by technology
[0006] A disadvantage of the known lens system, the known optical scanner and the known optical player is that it is relatively difficult to obtain a relatively small error range within which the optical axes of the two lenses of the lens system must coincide
This can be attributed to the fact that setting the positioning surfaces on these two lens flanges with ideal precision is a very laborious process
Method used
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Embodiment Construction
[0028] figure 1 Represents the optical player of the present invention, which includes a bracket 1 that can rotate around a rotating shaft 3 and is driven by a motor 5, and the bracket is fastened on a bracket 7. An optically scanned information carrier 9, such as a DVD, can be placed on the tray 1, this information carrier having a disc-shaped transparent substrate on which is located an information layer 13 with a spiral information track. A transparent protective coating 11 covers the information layer 13 . The optical player also comprises an inventive optical scanner 15 for optically scanning the information tracks of the information carrier 9 . Using the displacement device 17 of the optical player, the scanning device 15 is mainly moved relative to the rotating shaft 3 in two opposite radial directions X and X'. To this end, the scanning device 15 is fastened on a slide 19 of a displacement device 17 equipped with a linear guide 21 on which the slide 19 slides, which ...
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Abstract
The invention relates to an objective system (39) which is suitable for use in an optical scanning device (15). The lens system (39) comprises a first lens, or objective lens (45), and a second lens, or auxiliary lens (47), which are mounted in fixed positions in a lens holder (61). The objective lens comprises more than one half of a first spherical lens body (67) having a first diameter (D1) and the auxiliary lens comprises more than one half of a second spherical lens body (69) having a second diameter (D2) which is smaller than the first diameter. The objective lens and the auxiliary lens are surrounded by a first circular-cylindrical inner wall (83) and a second circular-cylindrical inner wall (85), respectively, of the lens holder, having a diameter which is substantially equal to the first and the second diameter, respectively. Said inner walls can be provided in the lens holder in very accurate coaxial positions by means of conventional tools. In this manner, a very accurate centering of the objective lens and the auxiliary lens in the lens holder is achieved in a comparatively simple manner.
Description
technical field [0001] The present invention relates to an optical lens system equipped with: a first lens having a first optical axis and comprising at least a portion of a spherical first lens body having a first diameter; a second lens having a first optical axis The second lens has a second optical axis and includes at least a portion of a spherical second lens body having a second diameter, wherein the second diameter is smaller than the first diameter; The two optical axes of the first and second mirror mounts of the lens and the second lens are coincident. [0002] The invention also relates to a method of manufacturing an optical lens system. [0003] The invention also relates to an optical scanner for scanning the information layer of an optically scannable information carrier, the scanning device being equipped with a light source and having a device for focusing the radiation beam emitted by the light source in operation onto the information layer An optical lens...
Claims
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IPC IPC(8): G11B7/1374G02B7/02G02B13/00G11B7/135G11B7/22G11B11/105
CPCG11B7/1376G11B7/1374G11B7/13927G11B11/10534G11B11/10545G11B7/22G11B2007/13727
Inventor J·P·巴尔特曼B·H·W·亨德里克斯J·T·A·范德维尔东克
Owner KONINKLIJKE PHILIPS ELECTRONICS NV