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Optical disk recording/reproducing device

A technology of reproduction device and optical disc recording, applied in the directions of beam reproduction, magnetic recording, data recording, etc., can solve the problems of inability to increase the recording frequency, increase in transmission rate, increase in power consumption, etc.

Inactive Publication Date: 2005-01-19
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the power consumption increases, and there is a problem that the continuous operation time of the portable device becomes short
[0011] On the other hand, if the radial direction range of the magnetic core is increased to correspond to the radial direction movement of the objective lens 5 (in the above example, the range of ±0.6 mm), the inductance of the coil becomes larger.
In recent years, the transfer rate during recording tends to increase and the recording frequency tends to become higher. However, if the inductance becomes large, there is a problem that the recording frequency cannot be increased.

Method used

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  • Optical disk recording/reproducing device
  • Optical disk recording/reproducing device
  • Optical disk recording/reproducing device

Examples

Experimental program
Comparison scheme
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no. 1 example

[0039] Below, use Figure 1 to Figure 6 An optical disc recording and reproducing apparatus according to a first embodiment of the present invention will be described. FIG. 1 is a block diagram illustrating an optical disc recording and reproducing apparatus of the present embodiment, figure 2 It is a graph showing the relationship between the amount of movement of the objective lens in the tracking direction (radius direction) and the objective lens position signal in the optical disc recording and reproducing apparatus of the present embodiment, image 3 is a graph showing the magnetic field intensity distribution in the radial direction, Figure 4 is a graph showing the driving current peak waveform in the optical disc recording and reproducing device of this embodiment, Figure 5 is a diagram showing a driving current pulse waveform.

[0040] As shown in FIG. 1, the objective lens actuator of the optical head 10 is moved in the tracking direction to decenter the object...

no. 2 example

[0054] use Figure 7 The structure and operation of the second embodiment of the present invention will be described. Figure 7 It is a plan view of the optical head and the magnetic head of this embodiment. Figure 7 In FIG. 14 , the same symbols are attached to the components with the same functions and actions as those in FIG. 14 , and detailed description thereof will be omitted.

[0055] 9 is a reflective photointerrupter with a built-in light-emitting diode and a phototransistor, which is used as a moving amount detection unit in the tracking direction of the objective lens 5 . The photo-interrupter 9 is provided on the actuator base 4d which is the fixed side member of the objective lens actuator 4 so as to face the movable side member of the objective lens actuator holding the objective lens 5 . In order to track disc eccentricity etc., when the objective lens 5 is moved in the tracking direction by the objective lens actuator 4, according to the output signal of the...

no. 3 example

[0059] use Figure 8 , Figure 9A , Figure 9B , Figure 9C The structure and operation of the third embodiment of the present invention will be described. Figure 8 It is a plan view of the optical head and the magnetic head of the present embodiment, Figure 9A , Figure 9B , Figure 9C is a schematic diagram of a photodetector.

[0060] Figure 8 , Figure 9A , Figure 9B , Figure 9C In FIG. 14 , the same symbols are attached to the components with the same functions and actions as those in FIG. 14 , and detailed description thereof will be omitted.

[0061] This embodiment and Figure 7 The difference of the second embodiment shown is that instead of using the photo-interrupter 9 of the second embodiment, the photosensitive light-emitting element 1 is used as a movement detection unit (not shown) in the tracking direction of the objective lens.

[0062] Figure 9A , Figure 9B , Figure 9C Among them, 1a is the photodetector built in the photosensitive ligh...

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Abstract

A moved distance detecting means (15) detects the moved distance in a tracking direction of an object lens, a position signal generating means (60) generates a position signal corresponding to the position of the object lens based on the detection, and a drive signal modulating means (40) modulates the drive current of a magnetic head (20) according to this position signal. Therefore, a drive current can be controlled according to the moved distance of the object lens to enable the magnetic head to be driven with a small current when a moved distance is small and with a large current according to a moved distance only when it is large, whereby it is possible to reduce an average drive current and hence reduce power consumption as a whole.

Description

technical field [0001] The present invention relates to an optical disc recording and reproducing device as a device for optically recording and reproducing information. Background technique [0002] The current era is called the information age, in which technological development of high-density large-capacity memory as the core is flourishing. Capabilities required for memory include, for example, high density and large capacity, high reliability, rewrite function, and the like. As recording media satisfying these functions, optical disk memories such as magneto-optical disks are attracting the most attention. The present invention relates to an optical disc recording and reproducing device for recording or reproducing the above-mentioned optical disc memory. [0003] Conventionally, there have been many reports on technologies related to optical disc recording and reproducing devices. Hereinafter, a mini disc device as an optical disc recording and reproducing device ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B11/00G11B11/105
CPCG11B11/10534G11B11/10576G11B11/10573G11B11/10595G11B11/10508
Inventor 高岛诚
Owner PANASONIC CORP
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