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Optical pickup, optical disc device, compound coupling lens, compound prism and optical information apparatus

A technology of coupling lenses and pickups, applied in beam guides, information storage, optical recording heads, etc., can solve the problems of no display countermeasures, biased focus error signals, and reduced performance of optical discs.

Inactive Publication Date: 2009-10-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0042] However, in the optical pickup 250 shown in Patent Document 2, if the collimator lens 202 movable in the optical axis direction is arranged only in the outward direction, if the collimator lens 202 is moved in the optical axis direction of the laser light to correct the spherical surface aberration, divergent light or converging light will be incident on the optical system of the circuit, and defocus (de-focus) and spherical aberration will occur on the photodetector 215
As a result, an offset occurs in the focus error signal, and the recording or reproduction performance of the optical disc is degraded.
However, Citation 2 does not show a countermeasure against this problem

Method used

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  • Optical pickup, optical disc device, compound coupling lens, compound prism and optical information apparatus
  • Optical pickup, optical disc device, compound coupling lens, compound prism and optical information apparatus
  • Optical pickup, optical disc device, compound coupling lens, compound prism and optical information apparatus

Examples

Experimental program
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Embodiment approach 1

[0319] figure 1 , figure 2 and image 3 is a schematic configuration diagram of an optical pickup according to an embodiment of the present invention. in addition, Figure 1 to Figure 3 The main building blocks of the optical pickup shown are shown by the block diagram in Figure 30 and Figure 31 middle. Figure 30 The shown optical pick-up uses a kind of laser light with wavelength λ1, and can carry out the interaction between the first information recording medium (also called medium) 50 in the form of an optical disc and the second information recording medium 60 in the form of an optical disc. Replace the optical pickup used. in addition, Figure 31 The optical pickup shown can still be used interchangeably with the first information recording medium 50 formed in the form of an optical disc and the second, third, and fourth information recording media 60, 70, and 80 formed in the form of an optical disc. optical pickups such as Figure 31 The shown process gene...

Embodiment approach 2

[0420] Figure 15 , Figure 16 , Figure 17 , Figure 18 and Figure 19 It is a schematic configuration diagram of an optical pickup according to an embodiment of the present invention.

[0421] exist Figure 15 ~ Figure 19 In , components having the same functions as those in Embodiment 1 are assigned the same symbols and their descriptions are omitted. In the optical pickup of the first embodiment described above, the polygonal prism 4 has the first optical surface 4a and the second optical surface 4b, but in the optical pickup of the second embodiment, on the polygonal prism 4, except for the first optical surface 4a It has the 3rd optical surface 4c other than the 2nd optical surface 4b. The optical surface 4c is the third optical surface of the polygonal prism 4, which has the spectral characteristics of substantially totally transmitting the blue-violet light beams and substantially totally reflecting the red and infrared light beams. In addition, in this embodime...

Embodiment approach 3

[0457] Figure 44 , Figure 45 and Figure 46 It is a schematic configuration diagram of an optical pickup according to an embodiment of the present invention.

[0458] exist Figure 44 , Figure 45 , Figure 46 Among them, 1001a is a first light source emitting blue-violet laser light corresponding to the first laser light, and 1001b is a second light source emitting laser light of two wavelengths, red laser light corresponding to the second laser light and infrared laser light corresponding to the third laser light.

[0459] 1002 is a dichroic prism, 1003 is a diffraction grating, 1004 is an outgoing collimator lens equivalent to an outgoing coupling lens, 1005 is a polarized light conversion element composed of a liquid crystal or a transparent piezoelectric element, and 1006 is equivalent to realizing optical path switching In the polarizing beam splitter as an example of the function of the prism, 1008 is a standing mirror, 1009a and 1009b are 1 / 4 wavelength plates, ...

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Abstract

In an optical pickup that makes a blue violet laser light access to a first information recording medium (50) with a first transparent substrate thickness or a second information recording medium (60) with a second transparent substrate thickness, an optical path switching unit (3, 4) to switch the blue violet laser light to a first optical path or a second optical path is disposed between a light source (1a, 1b) and a coupling lens (5, 6) or between the coupling lens and an objective lens. Further, the coupling lens converts a reflective laser light reflected by the first information recording medium or the second information recording medium into converged light. The converged light is guided to a light receiving element (13).

Description

technical field [0001] The present invention relates to an optical pickup for recording and reproducing at least one of optical information on information recording media such as various optical disks, and an optical pickup device having the optical pickup, and having optical information of the optical pickup device. The device includes a compound coupling lens and a compound prism that the optical pickup has. Background technique [0002] In recent years, with the practical use of blue-violet semiconductor lasers, Blu-ray has the same size as CD (Compact Disc) and DVD (Digital Versatile Disc), but has a high-density, large-capacity optical information recording medium (hereinafter referred to as an optical disc). Optical disks (hereinafter referred to as BDs) have been put into practical use. The BD is an optical disc on which information is recorded or reproduced using a blue-violet laser light source that emits blue-violet laser light. In addition, HD and DVD, which als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/135G11B7/1353G11B7/1365G11B7/1374G11B7/1376G11B7/1392
Inventor 田中俊靖山崎文朝金马庆明若林宽尔
Owner PANASONIC CORP
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