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Optical head device and optical disc device

一种光学头装置、光盘装置的技术，应用在光学记录头、光学探测器、头的配置/安装等方向，能够解决层间串扰、质量劣化等问题，达到抑制层间串扰的效果

Inactive Publication Date: 2014-10-01
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a multi-layer optical disc having a plurality of information recording layers, there is a problem of interlayer crosstalk: that is, because not only the information recording layer (hereinafter referred to as "target layer") which is the object of recording or reproducing information is detected, In addition, reflected light from information recording layers other than the target layer (hereinafter referred to as "other layer stray light") is also detected, so the quality of reproduced RF signals and the quality of servo signals such as tracking error signals are degraded.

Method used

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  • Optical head device and optical disc device
  • Optical head device and optical disc device
  • Optical head device and optical disc device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0045] figure 1 It is a diagram schematically showing the main configuration of the optical disc device 1 according to Embodiment 1 of the present invention. Such as figure 1 As shown, the optical disc device 1 has an optical head device 11, a servo control circuit 12, a signal processing circuit 13, a modulation circuit 14, a laser control circuit 15, a demodulation circuit 16, an MPU (Micro Processor Unit: microprocessor) 17 and a memory 18. The MPU 17 is a controller that executes various control processes in accordance with instructions supplied from a host device (not shown) through an interface (I / F) 23 .

[0046] The servo control circuit 12 includes a spindle motor control unit 121 , a screw motor control unit 123 and an optical head control unit 122 , and these spindle motor control unit 121 , screw motor control unit 123 and optical head control unit 122 independently receive instructions from the MPU 17 to operate. Furthermore, the signal processing circuit 13 ...

Embodiment approach 2

[0115] Next, Embodiment 2 of the present invention will be described. Figure 8 It is a diagram schematically showing the structure of the photodetection element 40B of the second embodiment. The configurations of the optical head device and the optical disk device according to Embodiment 2 except Figure 8Except for the configuration of the photodetection element 40B, the configurations of the optical head device 11 and the optical disc device 1 of Embodiment 2 are substantially the same. In the present embodiment, the photodetection element 40B having a general-purpose light-receiving surface form used in the three-beam push-pull method is used instead of Figure 4 The light detection element 40.

[0116] like Figure 8 As shown, the light detection element 40B includes: a main light receiving part 400A, which receives the light spot of the return light beam RL0 as the 0th order diffracted light; a first sub light receiving part 401B, which receives the light spot of the ...

Embodiment approach 3

[0143] Next, Embodiment 3 of the present invention will be described. Figure 11 It is a diagram schematically showing the basic configuration of an optical head device 11B according to the third embodiment. The structure of the optical head device of this embodiment is substantially the same as that of the optical head device 11 of Embodiment 1 except for a part of the structure of the optical head device 11B. like Figure 11 As shown, the optical head device 11B has a beam splitter 33, a semiconductor laser 34, an objective lens 35, a cylindrical lens 37, an actuator 39, and a photodetection element 40A. The basic functions of these constituent elements 33, 34, 35, 37, 39 are respectively related to figure 2 The components 33 , 34 , 35 , 37 , and 39 of the first embodiment shown have the same functions.

[0144] in addition, Figure 11 is a diagram showing components for the purpose of explaining the basic structure and operating principle of the optical head device 11B...

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Abstract

This optical head device (11) is provided with: an optical element (36) for causing an optical beam emitted from a semiconductor laser (34) to be diffracted in transmission, generating a zero-degree-diffraction optical beam and a + / -1-degree-diffraction optical beam; and an optical detection element (40) for receiving the zero-degree-diffraction optical beam reflected by an optical disc (2) and the +1-degree-diffraction optical beam. The optical detection element (40) comprises a primary light-receiving unit (400) for receiving the zero-degree-diffraction optical beam, and a first auxiliary light-receiving unit (401) disposed outward from the primary light-receiving unit (400). The first auxiliary light-receiving unit (401) is disposed in a position for detecting a portion of the outer side of the light-receiving spot of the +1-degree-diffraction optical beam, and performs photoelectric conversion of the portion to output an auxiliary detection signal.

Description

technical field [0001] The present invention relates to an optical head device for recording or reproducing information on an optical recording and reproducing medium, and an optical disc device including the optical head device. Background technique [0002] Reduce the convergence on the focal plane of the objective lens by reducing the size of the recording mark recorded on the information track of the optical disc, shortening the wavelength of the laser light used for recording or reproducing information, and increasing the numerical aperture of the objective lens Spot size, and realize the large capacity of the optical disc. [0003] For example, in a CD (Compact Disc), the thickness of the disc substrate as the optical transmission layer of the disc (the transparent protective layer covering the information recording layer and the space layer) is about 1.2mm, the wavelength of the laser light is about 780nm, and the The numerical aperture (NA: Numerical Aperture) is 0....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/1353G11B7/09G11B7/131
CPCG11B7/125G11B7/0903G11B7/094G11B7/131G11B7/1353G11B2007/0013
Inventor 大牧正幸中井贤也竹下伸夫
Owner MITSUBISHI ELECTRIC CORP