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Focus pull-in control device and method thereof

A technology for controlling devices and controlling objects, applied in optical recording/reproduction, head configuration/installation, instruments, etc., which can solve problems such as wasting time

Inactive Publication Date: 2010-09-22
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a lot of time is wasted until data recording or reproduction is performed due to failure to perform focus introduction

Method used

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  • Focus pull-in control device and method thereof
  • Focus pull-in control device and method thereof
  • Focus pull-in control device and method thereof

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Embodiment Construction

[0034] Now, aspects of the present invention will be described in detail, examples of which are shown in the accompanying drawings, in which like reference numerals refer to like parts throughout. Hereinafter, aspects of the invention are described by referring to the figures in order to explain the invention.

[0035] Aspects of the present invention estimate disc surface vibrations relative to spindle motor rotation to increase the success rate of focus pull-in for discs with large surface vibrations by using the surface vibration information in focus pull-in operations. In aspects of the present invention, focusing lead-in refers to controlling the objective lens to match the up and down movement of the optical disc so that the laser beam is focused on the vibrating surface of the optical disc. In order to have a matching movement, the timing of the start focus introduction should be as precise as possible.

[0036] image 3 is a block diagram of a focus pull-in control d...

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Abstract

A focus pull-in control device for focusing a light beam on an information recording surface of an information recording medium includes an optical pickup and a control unit. The optical pickup has a light source to emit a light beam, an objective lens to focus the light beam along an optical axis direction on the information recording surface, a focus actuator to move the objective lens in the optical axis direction, and a photodetector to detect the light beam reflected by the information recording medium and to convert the detected light beam into an electric signal. The control unit controls an access speed of the objective lens by driving the focus actuator with reference to a surface vibration data comprising a previously obtained surface vibration amount of the information recording medium to perform a focus search while moving the light beam across the information recording medium and while moving the objective lens.

Description

[0001] This application claims the benefit of Korean Application No. 2005-97731 filed with the Korean Intellectual Property Office on Oct. 17, 2005, which is hereby disclosed by reference. technical field [0002] Aspects of the present invention relate to an apparatus for controlling focus pull-in and a method thereof. Background technique [0003] The optical recording / reproducing apparatus records data with respect to an optical disc or reproduces recorded data using an optical pickup. The optical pickup records data by emitting a laser beam onto the surface of an optical disc, or reads out recorded data by receiving a laser beam reflected by the surface of the optical disc. To do this, the optical pickup must focus precisely on the data recording layer of the disc, which is called focus servo. [0004] The optical pickup focuses the laser beam on the data recording layer of the optical disc by taking into account the surface vibration of the optical disc. The surface v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/09G11B7/00
CPCG11B7/0908G11B7/0956G11B7/0945G11B7/09G11B7/085
Inventor 洪铜基金成奎
Owner SAMSUNG ELECTRONICS CO LTD