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Optical pickup

An optical pick-up and light source technology, which is applied in the direction of optical recording head, recording/reproduction by optical method, beam source, etc., can solve the problems that it is difficult to realize the tracking servo of the optical pick-up head, and the TES offset cannot be corrected correctly.

Inactive Publication Date: 2005-02-02
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In this way, if the offset sensitivity of the push-pull signal changes sharply, the offset of the TES cannot be corrected correctly, and it is difficult to achieve a better tracking servo for the optical pickup.
Therefore, in the optical pickup using the phase shift grating, in order to improve the reliability of the tracking servo, there is room for further improvement

Method used

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Experimental program
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Effect test

Embodiment approach 1

[0046] The following according to Figure 1 to Figure 7 One embodiment of the present invention will be described.

[0047] The pick-up device (optical pick-up head) of the present embodiment, as shown in Figure 1 (a), is equipped with light sources 1 such as semiconductor lasers for generating light beams, the light beams emitted from this light source 1 are divided into main light beams (0-order light) ) 30 and the grating (light diffraction element) 3 of the above-mentioned 3 beams of 2 beams of sub-beams (+1 order light) 31 sub-beams (-1 order light) 32, the 3 beams of beams that are divided are placed on the optical disc (optical recording medium) ) 6 focused on the objective lens (focusing element) 5, from the reflected light of the respective optical disc 6 of the above-mentioned 3 beams, a photodetector (photodetection element · photodetector) 8 that detects a push-pull signal. Such as Figure 4 As shown, the above-mentioned photodetector 8 is divided into two photod...

Embodiment approach 2

[0089] Below, according to Figure 8 to Figure 11 Other embodiments of the present invention will be described. In addition, for convenience of description, members having the same functions as those shown in the drawings of Embodiment 1 above are denoted by the same reference numerals, and description thereof will be omitted.

[0090] The pick-up device of the present embodiment is that in the structure described in the above-mentioned Embodiment 1, instead of the grating 3, it is equipped with Figure 8 The grating 23 is shown. The grating 23 has the pattern A and the pattern B described in the first embodiment as a grating pattern, and a first area, a second area, and a third area are arranged in parallel in a direction perpendicular to the y direction (track direction). The above-mentioned first to third regions are distinguished by the layout patterns when the above-mentioned patterns A and B are arranged. In this embodiment, in each region, the patterns A and the patte...

Embodiment approach 3

[0107] Below, according to Figure 12 to Figure 15 Further other embodiments of the present invention will be described. In addition, for convenience of description, members having the same functions as those shown in the drawings of Embodiment 1 above are denoted by the same reference numerals, and description thereof will be omitted.

[0108] The pick-up device of this embodiment is as Figure 12 As shown, a holographic laser assembly is equipped with a light source 1, a grating 3 as a three-beam grating, a holographic element 9 as a beam deflection hologram for servo signal generation, and a photodetector equipped with a photodetector, that is, a photodetection element 10. The system is integrated into one component.

[0109] In the above holographic laser components, such as Figure 12 As shown, the light beam emitted from the light source 1 is divided into three light beams by a grating 3 , a main beam (0-order light) 30 , and two sub-beams (+1st-order light) 31 · sub-...

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Abstract

Regional borderlines that are the borderlines between the first region and the second region on a diffraction grating of an optical pickup partially overlap a group of y-axis parallel borderlines that are borderlines between pattern A and pattern B that are parallel to a direction parallel to the y-axis.

Description

technical field [0001] The present invention relates to an optical pickup for optically recording and reproducing information on an information recording medium such as an optical disc, and relates in detail to an optical pickup for correcting offsets in tracking error signals. Background technique [0002] Optical discs are used in many fields such as audio, video recorders, and computers as information signal media capable of recording a large amount of information signals at high density. In the above-mentioned information recording medium such as an optical disk, in order to reproduce an information signal recorded in units of micrometers, it is necessary to accurately track a light beam to a track of the optical disk. Various methods are known for detecting a tracking error signal (TES: Tracking Error Signal) used for the above-mentioned tracking. [0003] As one of the above-mentioned tracking methods, there is a differential push-pull method (DPP: Differential Push P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09G11B7/00G11B7/12G11B7/125G11B7/135G11B7/1353
CPCG11B7/1353G11B7/0903
Inventor 渡边由纪夫上山彻男
Owner SHARP KK