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Optical head device and optical information device, computer, optical disc generator, vehicle navigation system, optical recorder and optical disc server

An optical head device and optical system technology, applied in the direction of optical recording head, optical recording/reproduction, beam guiding device, etc., to achieve the effects of wide range of use, stable focus control performance, stable recording or reproduction

Active Publication Date: 2009-06-03
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, as mentioned above, in the optical information device that alternately adopts a plurality of optical discs with different recording densities, it is necessary to have objective lenses respectively corresponding to a plurality of optical discs with different recording densities. The first objective lens is mounted on the movable part, so that it can move along the focusing and tracking directions

Method used

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  • Optical head device and optical information device, computer, optical disc generator, vehicle navigation system, optical recorder and optical disc server
  • Optical head device and optical information device, computer, optical disc generator, vehicle navigation system, optical recorder and optical disc server
  • Optical head device and optical information device, computer, optical disc generator, vehicle navigation system, optical recorder and optical disc server

Examples

Experimental program
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Embodiment 1

[0044] Fig. 1 is the perspective view of main part of the optical head device in the embodiment 1 of the present invention, Fig. 2 is the schematic side view of the optical head device in the embodiment 1 of the present invention, image 3 It is a perspective view showing the structure of the objective lens actuator in Embodiment 1 of the present invention, Figure 4 It is an exploded perspective view showing the structure of the objective lens actuator in Embodiment 1 of the present invention.

[0045] In Figure 1~ image 3 Among them, T represents the tracking direction (T direction), F represents the focusing direction (F direction), and Y represents the tangential direction of the optical disc (Y direction). The above-mentioned tracking direction is a direction substantially perpendicular to the optical axes of the objective lenses 34 , 41 , and is substantially perpendicular to the tangential direction of the track grooves of the optical discs 32 , 35 , 46 . That is, it...

Embodiment 2

[0115] FIG. 12 is a schematic diagram of an optical information device 167 according to an embodiment of the present invention. In this optical information device 167, the optical head device 155 shown as the first embodiment is provided. In FIG. 12 , an optical disk 35 (or 32 , 46 , the same hereinafter) is mounted on a turntable 162 , is held between a clamper 163 , and is rotated by a motor 164 . The optical head unit 155 is moved to the position of the track on the optical disc 35 where desired information exists by the drive unit 151 of the optical head unit.

[0116] In addition, the optical head device 155 sends a focus error signal or a tracking error signal to the circuit 153 in order to adapt to the positional relationship with the optical disc 35 . The circuit 153 transmits a signal for finely moving the objective lens to the optical head device 155 in response to the above-mentioned signal. According to this signal, the optical head device 155 performs focus cont...

Embodiment 3

[0119] Figure 13 It is a schematic appearance diagram of a computer 100 equipped with the optical information device 167 described in the second embodiment.

[0120] The computer 100 includes: the above-mentioned optical information device 167, an input device 65 such as a keyboard, a mouse, and a touch pad for inputting information, based on information input from the above-mentioned input device 65 or information read from the above-mentioned optical information device 167, etc. A computing device 64 such as a central processing unit (CPU) for calculation, and an output device 61 such as a picture tube, a liquid crystal display device, and a printer for displaying information such as a result calculated by the computing device 64 .

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Abstract

An optical device is made compact with sufficient driving force of an object lens actuator achieved. An optical head device having a first optical system with a first objective lens that concentrates a light flux to an optical disk and having a second optical system with a second objective lens that has a low numerical aperture and concentrates a light flux to an optical disk. The second optical system irradiates the light flux on an optical disk having lower information recording density than a disk in the first optical system. In the optical device is provided an upward prism having a first reflection surface for bending, in the first optical system, the light flux into the direction of the optical axis of the first objective lens and having a second reflection surface for bending, in the second optical system, the light flux into the direction of the optical axis of the second objective lens.

Description

technical field [0001] The present invention relates to an optical information device for reproducing information from an information recording medium represented by an optical disc, or for recording information in an information recording medium, an optical head device for reproducing or recording information in an optical information device, and an optical information device equipped with the optical information recording medium. computer, CD replayer, car navigation system, CD recorder and CD server. Background technique [0002] A digital versatile disc (Digital Versatile Disc) (DVD) is known as an optical disc capable of recording large-capacity data because it can record digital information at a recording density approximately six times that of a compact disc (CD). In recent years, along with an increase in the amount of information to be recorded on an optical disc, an optical disc with a larger capacity is required. In order to increase the capacity of the optical d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/135G11B7/09G11B7/1359G11B7/1362
Inventor 若林宽尔金马庆明田中俊靖
Owner PANASONIC CORP