Laser device, optical pickup, and optical disk device

Abstract

The invention relates to a laser device, an optical pickup, and an optical disk device. The laser device includes a semiconductor laser, a signal generating circuit generating a pulse signal for driving the semiconductor laser, an amplifying circuit amplifying the pulse signal, and a control circuit unit provided between the amplifying circuit and the semiconductor laser and controlling the pulse signal by letting alternating-current components of the pulse signal pass through and removing at least part of direct-current components of the pulse signal.

Description

technical field [0001] The present invention relates to a laser device using a semiconductor laser. Furthermore, the present invention relates to an optical pickup and an optical disc device including the laser device. Background technique [0002] As an optical information recording medium, a disc-shaped optical information recording medium (optical disc) is widely used in the prior art. [0003] Typically, Compact Disc (CD), Digital Versatile Disc (DVD), Blu-ray Disc have been used Wait. [0004] On the other hand, optical disc devices supporting optical disc information recording media are configured to record various contents such as music content and video content and various types of information such as various data for computers in the optical information recording medium. [0005] Specifically, in recent years, the amount of information has increased due to, for example, increased resolution of video and increased sound quality of music. Furthermore, it has been...

AI Technical Summary

Problems solved by technology

[0010] However, since these short-pulse light sources can output short pulses through the operation of optical components provided outside the light generator, the size of these light sources is generally large, and their price is relatively high

[0011] Therefore, it is impractical to install a short-pulse light source on an optical disc device

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