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Integrated circuit, optical disc device and tracking error signal generating method

An integrated circuit and tracking error technology, which is applied in the field of generating tracking error signals, can solve the problem of difficult to cope with the high density of optical recording media with doubled speed of optical disc devices, and achieve the effects of reducing area, circuit scale and cost.

Inactive Publication Date: 2010-03-31
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Conventionally, in tracking error detection devices that generate tracking error signals by analog signal processing, it is difficult to cope with the increase in the speed of optical disc devices and the increase in density of optical recording media.

Method used

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  • Integrated circuit, optical disc device and tracking error signal generating method
  • Integrated circuit, optical disc device and tracking error signal generating method
  • Integrated circuit, optical disc device and tracking error signal generating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0038] The optical disc device according to Embodiment 1 has figure 1 The tracking error detection device 100 is shown. The tracking error detection device 100 includes a four-quadrant photodetector 101 , four current-to-voltage converters 102 a - 102 d and an integrated circuit 110 .

[0039] The four-quadrant photodetector 101 has four light receiving surfaces 101a to 101d as A channel, B channel, C channel and D channel, and outputs a photocurrent corresponding to the amount of light received by each of the light receiving surfaces 101a to 101d. Here, the light receiving surface 101a and the light receiving surface 101c correspond to the first light receiving surface in the claims, and the light receiving surface 101b and the light receiving surface 101d correspond to the second light receiving surface in the claims.

[0040] The current-to-voltage converter 102a converts the photocurrent corresponding to the amount of light received by the light-receiving surface 101a in...

Embodiment approach 2

[0061] An optical disc device according to Embodiment 2 of the present invention, instead of the tracking error detection device 100 according to Embodiment 1, has figure 2 The tracking error detection device 200 is shown. The tracking error detection device 200 has an integrated circuit 210 instead of the integrated circuit 110 of the tracking error detection device 100 . This integrated circuit 210 includes a sampling frequency setting unit 211 and a low-pass filter control unit 212 in addition to the configuration of the integrated circuit 110 according to the first embodiment. Other configurations and operations of the optical disc device of this embodiment are the same as those of Embodiment 1, and therefore detailed description thereof will be omitted.

[0062] The sampling frequency setting part 211 sets the sampling frequency of the first digital sampling part 113a and the sampling frequency of the second digital sampling part 113b to a frequency different from an int...

Embodiment approach 3

[0067] An optical disc device according to Embodiment 3 of the present invention, instead of the tracking error detection device 100 according to Embodiment 1, has image 3 The tracking error detection device 300 is shown. The tracking error detection device 300 has an integrated circuit 310 instead of the integrated circuit 110 of the tracking error detection device 100 . This integrated circuit 310 includes a first delay circuit 311 a , a second delay circuit 311 b , and a delay amount control unit (controller) 312 in addition to the configuration of the integrated circuit 110 of Embodiment 1. Other configurations and operations of the optical disc device of this embodiment are the same as those of Embodiment 1, and therefore detailed description thereof will be omitted.

[0068] The first delay circuit 311a delays the first binarized signal output from the first comparator 112a before inputting the first binarized signal to the first digital sampling unit 113a.

[0069] T...

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Abstract

A first comparator (112a) compares a first voltage signal with a predetermined threshold value to output a first binarized signal. A second comparator (112b) compares a second voltage signal with a predetermined threshold value to output a second binarized signal. A first digital sampling unit (113a) carries out the sampling of the first binarized signal output by the first comparator (112a) to generate a first sampling signal. A second digital sampling unit (113b) carries out the sampling of the second binarized signal output by the second comparator (112b) to generate a second sampling signal. A phase difference detecting circuit (114) detects a phase difference between the first sampling signal generated by the first digital sampling unit (113a) and the second sampling signal generatedby the second digital sampling unit (113b).

Description

technical field [0001] The present invention relates to a technique for generating a tracking error signal in an optical disc device. Background technique [0002] Conventionally, in a tracking error detection device that generates a tracking error signal by analog signal processing, it is difficult to cope with the increase in the speed of an optical disc device and the increase in density of an optical recording medium. [0003] In the tracking error detection device disclosed in Patent Document 1, in order to solve the above-mentioned problem, a tracking error signal is mainly generated by digital signal processing. More specifically, the tracking error inspection device of Patent Document 1 utilizes an ADC (Analog to Digital Converter: analog-to-digital converter) for the first one representing the amount of light received by two light-receiving surfaces of a four-quadrant photodetector (four-quadrant photodetector). AD conversion is performed on the voltage signal and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09
CPCG11B7/0906
Inventor 片山刚山元猛晴坂井满
Owner PANASONIC CORP