Optical pickup device and information recording and reproducing device
An optical pickup device, a technology for information recording, which can be applied to optical recording heads, beam guiding devices, recording/reproducing by optical methods, etc., and can solve problems such as unfavorable miniaturization and rising cost.
Inactive Publication Date: 2011-12-21
KONICA MINOLTA OPTO
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Problems solved by technology
[0005] Here, as a method for properly recording / reproducing information while maintaining compatibility with any of high-density optical discs, DVDs, and CDs, it is conceivable to selectively switch Optical systems for high-density optical discs and optical systems for DVDs. However, since multiple optical systems are required, it is not conducive to miniaturization, and the cost increases
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[0149] Embodiments of the present invention will be described below with reference to the drawings. Figure 4 (a) is a schematic top view of an information recording and reproducing device, which includes an optical pickup device of this embodiment capable of appropriately recording / reproducing information on optical information recording media (also referred to as optical discs) BD and DVD having different protective layer thicknesses, Figure 4 (b) is cut along line IVB-IVB Figure 4 The structure of (a) is seen in the direction of the arrow.
[0150] Figure 4 Among them, the carriage base CB is arranged so that it can move along two guide shafts GS3 extending in parallel by a transmission device not shown. A semiconductor laser LD, a polarization beam splitter PBS, a sensor lens SEN, a photodetector PD, and a collimator lens CL are disposed on the carriage base CB. In the present embodiment, the optical disks BD and DVD are arranged obliquely with respect to the two gui...
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Abstract
The present invention provides an optical pickup device and an information recording and reproducing device capable of appropriately recording and / or reproducing information on an optical information recording medium having a multilayer information recording surface. As shown by the solid line, the multilayer information recording surface of the optical information recording medium is inclined relative to the direction perpendicular to the optical axis of the objective lens provided with the diffractive structure for compatibility, so that the light beam is incident from the light source along the optical axis of the objective lens. The n-order diffracted light generated from the diffraction structure is reflected on the information recording surface (LY1), returns in a direction inclined to the optical axis of the objective lens, and is detected by a photodetector. On the other hand, the m (≠n) order diffracted light may converge on the information recording surface (LY2) and return in a direction oblique to the optical axis of the objective lens, but the two reflected lights are offset and parallel. Therefore, as long as the photodetector is arranged at a position where only reflected light (R1) can be detected, the possibility of erroneous detection of reflected light (R2) is reduced, and appropriate information recording and / or reproduction can be performed.
Description
[0001] The application date is February 22, 2008, the application number is 200880007817.4, the title of the invention is "optical pick-up device and information recording and reproducing device", and the applicant is a branch of the Chinese invention patent application of Konica Minolta Precision Optics Co., Ltd. case application. technical field [0002] The present invention relates to an optical pickup device and an information recording and reproducing device, and more particularly to an optical pickup device and an information recording and reproducing device capable of recording and / or reproducing information on an optical disc having a multilayer information recording surface. Background technique [0003] In recent years, the research and development of high-density optical disc systems capable of recording and / or reproducing information (hereinafter "recording and / or reproducing" is referred to as "recording / reproducing") using a blue-violet semiconductor laser with...
Claims
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IPC IPC(8): G11B7/135G11B7/005
CPCG11B7/1353G11B7/1374G11B2007/0013
Inventor 小野雄树
Owner KONICA MINOLTA OPTO