NDLI: Auto-adjustment of the Objective Lens Neutral Position in Optical Disc Drives

Content Provider	IEEE Xplore Digital Library
Author	Jung Rae Ryoo Tae-Yong Doh
Copyright Year	1975
Abstract	Optical axis misalignment, which represents deviated neutral position of the objective lens from the optical axis, is an inevitable assembly error in an optical pick-up. Since the laser power intensity varies with respect to the distance from the optical axis, the misalignment leads to variation of the laser spot power intensity, which is one of the critical factors increasing data bit-error-rate in optical disc drives. In this paper, an auto-adjustment scheme of the objective lens neutral position is proposed to eliminate the undesirable variation of the laser spot power intensity in optical disc drives. An envelope of the data signal is extracted and utilized to detect the optical axis misalignment. Then an adjustment input is added to the driving input of the fine actuator to align the objective lens to the optical axis. Finally, the feasibility is verified by a series of experiments.
Sponsorship	IEEE Consumer Electronics Society
File Size	1305015
File Format	PDF
ISSN	00983063
Volume Number	53
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Lenses Drives Surface emitting lasers Optical feedback Power lasers Stimulated emission Actuators Optical control Laser beams Optical recording
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Media Technology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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