Optical pickup and optical disc apparatus
A technology of optical pickup and optical disc device, which is applied to beam guiding device, optical recording head, recording/reproducing by optical method, etc. The effect of configuration size, reduced manufacturing cost, simplified configuration
Inactive Publication Date: 2006-12-27
SONY CORP
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- Abstract
- Description
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- Application Information
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Problems solved by technology
However, this optical pickup requires a switching mechanism between various types of optical systems, and thus has a complicated structure, resulting in an increase in cost
In addition, it is difficult to reduce the size of the optical pickup due to the large size of the switching mechanism
Method used
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Embodiment Construction
[0013] Next, an optical disc device using an optical pickup according to an embodiment of the present invention will be described with reference to the accompanying drawings.
[0014] like figure 1 As shown in , the optical disc device 1 according to the present embodiment includes: an optical pickup 3 for recording information to or reproducing information from the optical disc 2; a spindle motor 4 serving as a drive for rotatably operating the optical disc 2 device; and a feed motor 5 for moving the optical pickup 3 in the radial direction of the optical disc 2. The optical disc device 1 has achieved compatibility that allows information to be recorded on and / or reproduced from various types of optical discs in different formats.
[0015] The optical disc 2 that can be used in this embodiment is, for example, such as CD (Compact Disc), DVD (Digital Versatile Disc), CD-R (Recordable), and DVD-R on which information can be added in a recordable manner. (recordable) and discs...
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Abstract
There is provided an optical pickup for recording or reproducing an information signal on / from a plurality of optical discs, each including a protective substrate having a different thickness for protecting a signal recording surface. The optical pickup includes: a light source section emitting a light beam having a predetermined wavelength; a first and second objective lens collecting light on the signal recording surface while reducing a spherical aberration due to a protective substrate having a first and second thickness, respectively; a polarization switching section adapted to switch a polarized state of the light beam emitted from the light source section; and a polarization beam splitter adapted to guide the light beam to either the first objective lens or the second objective lens depending on the polarized state of the light beam switched by the polarization switching section.
Description
technical field [0001] The present invention relates to an optical pickup and an optical disc apparatus which record information signals onto or reproduce information signals from an optical disc on which information recording and reproduction are performed optically, wherein the optical disc is, for example, a magneto-optical disc or phase-change discs. Background technique [0002] As the density of information recording media such as optical discs increases, formats using light sources with various wavelengths and including protective substrates with various thicknesses are provided. There is a need for an optical pickup having compatibility with various types of optical discs. [0003] In practice, a compatible optical pickup has recently been known which allows information signals to be recorded on optical discs of different formats using different wavelengths and comprising protective substrates with different thicknesses, and which allows reproduce the information s...
Claims
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IPC IPC(8): G11B7/125G11B7/135
CPCG11B7/1365G11B7/13925G11B2007/0006G11B7/1374G11B7/1395
Inventor 汤川弘章
Owner SONY CORP