Optical pickup device and information recording and reproducing device
An optical pick-up device and information recording technology, which is applied in the direction of optical recording head, light beam guiding device, optical recording/reproduction, etc., can solve the problems of rising cost and unfavorable miniaturization
Inactive Publication Date: 2010-01-20
KONICA MINOLTA OPTO
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Problems solved by technology
[0004] 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, but since multiple optical systems are required, it is not conducive to miniaturization, and the cost increases
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[0148] 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.
[0149] 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
An optical pickup device and an information recording and reproducing device are provided for making it possible to carry out proper information recording and / or reproducing for an optical information recording medium with multiple-layer information recording surfaces. With respect to a direction perpendicular to an optical axis of an objective lens (OBJ) provided with a compatible diffraction structure, multiple-layer information recording surfaces (LY1, LY2) of an optical recording medium as shown by solid lines are inclined, so that a light bundle is made to be incident from a light source to an objective lens along the optical axis. The n-th diffraction light generated from the diffraction structure is reflected from the information recording surface (LY1), returns to a direction inclined with respect to the objective lens (OBJ) and is detected by a light detector (PDy). On the other hand, when the m-th diffraction light, (m is not equal to n), is collected on the information recording surface (LY2), the diffraction light returns to a direction inclined with respect to the optical axis of the objective lens (OBJ) but two reflecting light components (R1, R2) are shifted to become in parallel. Thus, if the light detector (PDy) is set at a position where only the reflecting light (R1) can be detected, there is a less risk that the reflecting light (R2) is detected in error, so that information recording and / or reproducing can be carried out properly.
Description
technical field [0001] 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 [0002] 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 a wavelength of about 400 nm is rapidly progressing. For example, for an optical disc that records / reproduces with a specification of NA0.85 and a light source wavelength of 405nm, that is, the so-called Blu-ray Disc (hereinafter referred to as BD), the size is the same as that of a DVD (NA0.6, light source wavelength of 650nm, memor...
Claims
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IPC IPC(8): G11B7/135G11B7/095
CPCG11B2007/0013G11B7/1374G11B7/1353
Inventor 小野雄树
Owner KONICA MINOLTA OPTO