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Optical system of optical pick-up

A technology of optical system and pick-up, applied in the field of optical system, can solve the problems such as the reduction of flare intensity of CD data recording layer

Active Publication Date: 2008-07-30
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] With this structure, those rays incident on the peripheral area for CD are diffused into a wider area on the CD data recording layer, so the flare intensity on the CD data recording layer is reduced

Method used

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Embodiment Construction

[0065] Embodiments of the present invention are described below with reference to the accompanying drawings.

[0066] figure 1 Shown is a configuration diagram of an optical system of an optical pickup according to an embodiment of the present invention. The optical system 100 supports at least two types of optical discs 20A and 20B. That is, the optical system 100 can record data into and / or reproduce data from various kinds of optical disks 20A and 20B.

[0067] The optical disc 20A has a relatively thick film thickness and a relatively low recording density. For example, the optical disc 20A may be a CD or a CD-R. The optical disc 20B has a relatively thin film thickness and a relatively high recording density. For example, the optical disc 20B is a DVD.

[0068] Such as figure 1 As shown, the optical system 100 includes light sources 30A and 30B, a half mirror 40 , a collimating mirror 50 , an objective lens 10 and a light detection unit 60 . The optical disc 20A (o...

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Abstract

There is provided an optical system of an optical pick-up for recording / reproducing data to / from at least two types of optical discs including a first optical disc and a second optical disc whose recording density is higher than that of the first optical disc. The optical system is provided with a light source unit for the first and second optical discs, an objective lens, and a photo detector. The optical system further includes an optical surface to satisfy compatibility between the at least two types of optical discs, the optical surface being located between the light source unit and one of the at least two type of optical discs. The optical surface has an inner region having a numerical aperture for the first optical disc, an outer region located having a numerical aperture for the second optical disc, and an intermediate region that is located within the outer region at a periphery of the inner region. Transmissivity for a light beam having a wavelength suitable for the first optical disc in the intermediate region is lower than that in the inner region.

Description

technical field [0001] The present invention relates to an optical system for an optical pickup of an optical disc device for recording data to / from a plurality of optical discs from among a plurality of optical discs having different coating thicknesses. Background technique [0002] Various optical discs in which digital information is recorded at different recording densities and which differ in film thickness have been widely used. For example, the recording density of DVD (Digital Multimedia Disc) is higher than that of CD (Compact Disc) and CD-R (Compact Disc Recordable), and its coating thickness is thinner than that of CD or CD-R. [0003] In the optical system of an optical pickup, spherical aberration varies with the thickness of the optical disc coating used. Therefore, when the system is changed to another optical disc with a different coating thickness and recording density, the numerical aperture (numerical aperture--NA) of the light used for recording / reprodu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/135G02B13/00G11B7/00
CPCG11B7/1374G11B2007/0006G11B7/1353
Inventor 山中健三丸山晃一竹内修一
Owner KONICA MINOLTA INC