Pick-up device

Abstract

A pick-up device (100) that can be used in a drive device for an optical disc is arranged opposite to the optical disc to irradiate a light beam from a light source onto an information recording surface of the optical disc. The pick-up device (100) has a movable arm mechanism (50), which includes an objective lens (4) for focusing light beams on the information recording surface of the optical disc, and controls the irradiation of the light beams on the optical disc by moving the objective lens (4). In addition, the pick-up device (100) has an optical system for guiding the light beam emitted by the light source (2) to a position below the objective lens (4). The optical system (3) is placed at the same height level as the arm mechanism (50). Therefore, compared with the case where the optical system is located below the actuator mechanism, the thickness of the entire pick-up device is smaller, and a pick-up device suitable for a thin driving device can be obtained.

Description

technical field [0001] The present invention relates to a pick-up for a disc drive for optically writing and reading information on an optical disc, and more particularly to a pick-up suitable for thin disc drives. Background technique [0002] Disk drives for recording and reproducing information on and from optical disks such as CDs (Laser Disks) and DVDs (Digital Video Disks) include optical pickups. In order to accurately record and reproduce information on and from the optical disc, the pickup device performs focus control to control the distance between the objective lens and the information recording surface of the optical disc, and tracking control to control the objective lens to follow the information track of the optical disc. [0003] The pickup device guides a laser beam emitted from a light source such as a laser diode to an objective lens by using predetermined optical system elements, and irradiates the laser beam on an information recording surface of an opt...

AI Technical Summary

Problems solved by technology

[0005] However, when the optical path of the laser beam is set at a lower height level than the lens holder, the overall height (thickness in the vertical direction) of the pickup increases

For example, in a thin drive device such as a drive device installed in a notebook personal computer, a thinner pick-up must be used, so the above-mentioned thicker pick-up cannot be used.

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