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Semiconductor laser driving device, optical head device and optical information recording/reproducing device

A driving device and laser technology, applied in the direction of semiconductor lasers, lasers, optical recording heads, etc., can solve the problems of RIN increase, optical information recording and reproduction device reliability reduction, jitter, etc., and achieve the effect of suppressing the increase of noise

Inactive Publication Date: 2007-11-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, if the RIN of the semiconductor laser in the optical head device increases, the reproduction characteristics such as jittering will deteriorate.
[0031] As can be seen from the above description, even if the semiconductor laser or optical system in the optical head device is designed and adjusted to minimize RIN at room temperature, sometimes RIN will increase significantly due to temperature changes during operation, resulting in optical information recording. The problem that the reliability of the regeneration device is lowered

Method used

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  • Semiconductor laser driving device, optical head device and optical information recording/reproducing device
  • Semiconductor laser driving device, optical head device and optical information recording/reproducing device
  • Semiconductor laser driving device, optical head device and optical information recording/reproducing device

Examples

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Embodiment approach 1

[0079] FIG. 10 is a diagram showing the configuration of an embodiment of the semiconductor laser drive device of the present invention.

[0080] The semiconductor laser drive device of this embodiment includes: a semiconductor laser 1, a photodetection element 2 for detecting a part of the laser light emitted from the semiconductor laser 1, a laser drive circuit 4 for supplying a DC component of a laser drive current 6 to the semiconductor laser 1, and A high-frequency superimposing circuit 3 for superimposing a high-frequency current on the DC component of the driving current 6, a high-frequency superimposing control circuit 5 for controlling the operation of the high-frequency superimposing circuit 3, a temperature sensor 9 for detecting the temperature of the semiconductor laser 1, and a temperature sensor 9 for detecting the temperature of the semiconductor laser 1. A noise detection circuit 7 for noise (RIN), and a storage device 8 for storing various data such as the tab...

Embodiment approach 2

[0099] Next, an embodiment of the optical head device of the present invention will be described with reference to FIG. 12 . In FIG. 12 , components having the same functions as those in FIG. 10 are assigned the same symbols.

[0100] The optical head device of the present embodiment is characterized by including the semiconductor laser drive device of the first embodiment.

[0101] In the optical head device of the present embodiment, laser light 22 having a wavelength of 405 nm emitted from semiconductor laser 1 is converted into approximately parallel light by condensing lens 23 , and then incident on objective lens 25 by standing mirror 24 . The objective lens 25 focuses the laser light 22 onto the information layer of the optical disc 26 . The light reflected by the information layer of the optical disc 26 returns along the path opposite to the incident path in the order of the objective lens 25 , the standing mirror 24 , and the condensing lens 23 . The reflected light...

Embodiment approach 3

[0106] Next, an embodiment of the optical information processing device of the present invention will be described with reference to FIG. 13 .

[0107] The optical information processing device of the present embodiment is an optical disc device capable of recording data on and reproducing data from an optical disc, and is characterized in that it includes the optical disc device of the second embodiment.

[0108] The optical information recording and reproducing apparatus of this embodiment includes: the optical head device 31 of Embodiment 2, a motor 32 for rotating the optical disc 26, a power supply device 34 for supplying electric power to the optical head device 31 and the motor 32, and a circuit connected to the above-mentioned components. Substrate 33. A circuit for controlling the operation of the optical head device 31 and a circuit for performing signal processing necessary for recording and reproducing data on the optical disc 26 are provided on the circuit board. ...

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Abstract

A semiconductor laser driving device is provided with a high frequency superimposing circuit (3) for superimposing a high frequency current onto a laser driving current (6) of a semiconductor laser (1) provided in an optical head device; and a high frequency superimposition control circuit (5) which controls the frequency of the high frequency current corresponding to the temperature of the semiconductor laser (1).

Description

technical field [0001] The present invention relates to a semiconductor laser drive device that controls the output power of a semiconductor laser (laser diode: LD), an optical head device including the drive device, and an optical information processing device using the optical head device. Background technique [0002] Data recorded on the optical disc is reproduced by irradiating a rotating optical disc with a relatively weak light beam of a constant light intensity and detecting reflected light modulated by the optical disc. [0003] In a reproduction-only optical disc, information on pits is recorded in a spiral shape in advance at the manufacturing stage of the optical disc. On the other hand, in rewritable optical discs, by vapor deposition or other methods, on the surface of the base material forming the track with spiral lands or grooves, recordings that allow optical recording / reproduction of data are deposited. material film. When recording data on a rewritable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/125H01S5/068
CPCH01S2301/02H01S5/0683G11B2007/0013G11B7/126H01S5/06817H01S5/06832
Inventor 吉田广昭林秀树龟井智忠
Owner PANASONIC CORP