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Optical head device, optical information device, computer, disc player, car navigation system, optical disc recorder, and vehicle

A technology of optical information and optical head, applied in the direction of optical recording head, beam guiding device, optical recording/reproduction, etc., can solve the problems of not being disclosed, and achieve wide dynamic range of shape, reliable focus servo, and small number of parts Effect

Active Publication Date: 2012-03-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] As another subject of the prior art, since only the case of using a single light source is shown, it is not disclosed in an optical head device having a plurality of, especially different, three-wavelength light sources. The composition of the focus error signal and implemented in the cheapest way

Method used

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  • Optical head device, optical information device, computer, disc player, car navigation system, optical disc recorder, and vehicle
  • Optical head device, optical information device, computer, disc player, car navigation system, optical disc recorder, and vehicle
  • Optical head device, optical information device, computer, disc player, car navigation system, optical disc recorder, and vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0069] figure 1 The structure of the optical head device 100 of this embodiment is shown.

[0070] The optical head device 100 has semiconductor laser elements (hereinafter referred to as "light sources") that emit light beams of at least two different wavelengths, and is capable of recording and / or reproducing information on different types of optical discs. In the following description, an example will be described where there are three light sources and it is possible to record information and / or reproduce information on BD, DVD, and CD.

[0071] The optical head device 100 has: light source modules 1 and 12, parallel plate 3, holographic element 4, relay lens 5, wedge 6, collimator lens 7, erect mirror 8, objective lens 9, photodetector 10, diffraction element 13 and 1 / 4 wavelength plate 18 .

[0072] Next, the function of each component will be described while explaining the operation when the optical head device 100 radiates light. in, figure 1 The middle Y axis is...

Embodiment approach 2

[0129] Figure 8 The structure of the optical head device 200 of this embodiment is shown. Among the components of the optical head device 200, there are the same as the optical head 100 of Embodiment 1 ( figure 1 ) The constituent elements included in ) have the same functional elements are given the same reference symbols, and descriptions thereof are omitted.

[0130] The main difference is that a detection lens 501 is newly installed and an objective lens 25 is installed instead of the objective lens 9 .

[0131] The detection lens 501 is an anamorphic lens provided so that two orthogonal axes have different focal lengths, since the detection lens 501 performs focus error signal detection by the astigmatism method.

[0132] The objective lens 25 is a lens designed as follows. Next, the objective lens 25 of the present embodiment will be described in detail.

[0133] The objective lens 25 is compatible with BD, DVD, and CD. Tables 1 to 4 show specific specifications o...

Embodiment approach 3

[0162] Figure 12 The configuration of the optical information device 167 using the optical head device of Embodiment 1 or 2 is shown. Next, an example in which the optical head device according to Embodiment 1 is used will be described.

[0163] exist Figure 12 Among them, the optical disc 26 (or 27 , 28 , hereinafter the same) is placed on the turntable 182 and is rotationally driven by the motor 164 . The optical head device 155 shown in Embodiment 1 is roughly adjusted to the track position of the optical disc where desired information exists by the drive device 151 of the optical head device.

[0164] The optical head device 155 also sends a focus error (focus error) signal and a tracking error signal to the circuit 153 in accordance with the positional relationship with the optical disc 26 . The circuit 153 sends a signal for finely moving the objective lens to the optical head device 155 in response to the signal. Based on this signal, the optical head device 155 p...

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Abstract

Provided is an optical head device capable of coping with optical discs of different types and assuring a sufficient dynamic range for a low-density optical disc. An optical head device includes: a plurality of light sources which are switched from one to another for use; an objective lens for converging light emitted from one of the light sources onto a recording surface of an optical disc; and a photo detector for receiving the light reflected from the recording surface and outputting a focus error according to the light reception amount. In the optical head device, a defocus detection range of a focus error signal obtained according to light of the first wavelength light is set wider than a defocus detection range of the focus error signal obtained according to light of the second waveform.

Description

technical field [0001] The present invention relates to an optical information device for reproducing information from or recording information on an information recording medium typified by an optical disc, an optical head device for reproducing or recording information in the optical information device, and information equipment and systems using them. Background technique [0002] A digital versatile disc (DVD) is known as an optical disc capable of recording digital information at a recording density approximately six times that of a compact disc (CD), and capable of recording large-capacity data. In recent years, as the amount of information to be recorded on an optical disc increases, an optical disc with a larger recording capacity is required. [0003] In order to increase the recording capacity of an optical disc, it is necessary to increase the recording density of information. Specifically, it is necessary to reduce the size of the spot formed by the light irradi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/1374G11B7/1353G11B7/1275G06F1/16G11B7/125G11B7/135
CPCG11B7/13925G11B7/1275G11B7/1353G11B7/08511G11B7/0909G11B7/1374G11B2007/0006
Inventor 金马庆明山崎文朝林克彦
Owner PANASONIC CORP
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