Information reproducing/recording device
A technology for information reproduction and recording equipment, which is applied in data recording, information storage, optical recording heads, etc., and can solve problems such as collisions, reduction of focus error signal amplitude, and focus pullback
Inactive Publication Date: 2008-02-06
FUNAI ELECTRIC CO LTD
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Problems solved by technology
This aberration reduces the amplitude of the focus error signal, resulting in failure of focus draw-in, collision between the objective lens of the optical pickup and the multilayer optical recording medium, etc.
Method used
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[0044] FIG. 1 is a block diagram of an information reproducing / recording device 10 according to an embodiment of the present invention. The information reproducing / recording device 10 reproduces or records information through the multilayer optical recording medium 1 . The multilayer optical recording medium 1 is an optical disc such as a DVD (Digital Versatile Disc) formed by stacking a plurality of recording layers L0, L1 capable of reproducing and recording information from a surface layer. The optical pickup 2 includes: a laser source 3 , a coupling lens 4 , a prism 5 , a condenser lens 6 , a photodetector 7 , an aberration correction element 8 , an objective lens 9 and an actuator 11 . The laser light source 3 is a semiconductor laser element or the like. The aberration correcting element 8 is a liquid crystal element or the like. The actuator 11 includes an electromagnetic induction coil, a magnet, and the like, and supports the objective lens 9 and the aberration corr...
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The present invention aims to provide an information reproducing / recording device capable of enhancing the reliability of a focus jump. In the information reproducing / recording device in which the laser light emitted from a laser light source of an optical pickup is collected by an objective lens, irradiated on a multi-layered optical recording medium, and reflected by the multi-layered optical recording medium so as to be received by a light detector to be converted to an electrical signal, so that a focusing error signal and a tracking error signal are detected by the electrical signal in a signal processing circuit and focusing servo and tracking servo are executed based on the respective signal to reproduce or record information, the power of the laser light emitted from the laser light source is raised (S3) with the focusing and tracking servo turned OFF when reproduction of information and the like with respect to one of the recording layers of the multi-layered optical recording medium is finished to execute focus jump while optimally maintaining the amplitude of the focusing error signal.
Description
technical field [0001] The present invention relates to an information reproducing / recording apparatus for performing a focus jump process in which the focus position of laser light irradiated onto a multilayer optical recording medium having a plurality of recording layers is changed from one recording layer to Move to another recording layer. Background technique [0002] An optical recording medium such as a DVD (Digital Versatile Disc) includes a plurality of recording layers capable of reproducing and recording information stacked from a surface layer. In an information reproducing / recording apparatus capable of reproducing and recording information through such a multilayer optical recording medium, an optical pickup (pickup) is driven to irradiate laser light from one surface side of the multilayer optical recording medium when reproducing information or the like to a recording layer; detecting a focus error signal, a tracking error signal, etc., from laser light ref...
Claims
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IPC IPC(8): G11B7/085G11B7/09G11B7/125
CPCG11B7/13925G11B2007/0013G11B7/08511
Inventor 中尾诚仁清水真弥紫原哲也
Owner FUNAI ELECTRIC CO LTD