Analysis of beam spot deviation considering vibration of components in optical pickup

An optical disc drive uses an optical pickup to read and write data by focusing a laser beam on the data plane of a rotating disc. The pickup is required to keep the beam spot on the current track. The latest trend of replacing metal pickup housing with plastic easily excites elastic deformation mod...

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Autores principales:	Manabu OCHI, Katsuhiko KIMURA, Mitsuo SATAKE
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2018
Materias:	vibration positioning frequency response ray transfer matrix method optical disc drive Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/761cfa49bb0840dab6c01e0b5eac6c3d
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spelling	oai:doaj.org-article:761cfa49bb0840dab6c01e0b5eac6c3d2021-11-26T07:14:14ZAnalysis of beam spot deviation considering vibration of components in optical pickup2187-974510.1299/mej.17-00484https://doaj.org/article/761cfa49bb0840dab6c01e0b5eac6c3d2018-01-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/5/1/5_17-00484/_pdf/-char/enhttps://doaj.org/toc/2187-9745An optical disc drive uses an optical pickup to read and write data by focusing a laser beam on the data plane of a rotating disc. The pickup is required to keep the beam spot on the current track. The latest trend of replacing metal pickup housing with plastic easily excites elastic deformation modes of the pickup housing. Optical components mounted on the housing are vibrated at the mode frequencies of the housing as well. These vibrations tilt the incident angle of a laser beam entering the objective lens and results in the displacement of the beam spot on the data plane. Our purpose in this paper is to improve the accuracy of a vibration model for optical pickups by considering the effect of the elastic deformation modes of the housing in addition to the commonly used mechanical dynamics of an objective lens actuator in order to predict stability in a tracking servo system. The effect of the elastic deformation modes of the housing was formularized as the incident angle deviation and was calculated by adding and subtracting the products of a ray transfer matrix chain representing the transfer from each optical component to the objective lens with its small displacement and tilt vector. This new vibration model reproduced an increased gain around a frequency of 20 kHz in the measured open-loop transfer function of the tracking servo system with 4% error in frequency, which was entirely unexpected in the context of existing vibration models for optical pickups. The calculated results also identified the most influential vibration modes of the housing and estimated the effectiveness of stiffening the housing with 17% error.Manabu OCHIKatsuhiko KIMURAMitsuo SATAKEThe Japan Society of Mechanical Engineersarticlevibrationpositioningfrequency responseray transfer matrix methodoptical disc driveMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 5, Iss 1, Pp 17-00484-17-00484 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	vibration positioning frequency response ray transfer matrix method optical disc drive Mechanical engineering and machinery TJ1-1570
spellingShingle	vibration positioning frequency response ray transfer matrix method optical disc drive Mechanical engineering and machinery TJ1-1570 Manabu OCHI Katsuhiko KIMURA Mitsuo SATAKE Analysis of beam spot deviation considering vibration of components in optical pickup
description	An optical disc drive uses an optical pickup to read and write data by focusing a laser beam on the data plane of a rotating disc. The pickup is required to keep the beam spot on the current track. The latest trend of replacing metal pickup housing with plastic easily excites elastic deformation modes of the pickup housing. Optical components mounted on the housing are vibrated at the mode frequencies of the housing as well. These vibrations tilt the incident angle of a laser beam entering the objective lens and results in the displacement of the beam spot on the data plane. Our purpose in this paper is to improve the accuracy of a vibration model for optical pickups by considering the effect of the elastic deformation modes of the housing in addition to the commonly used mechanical dynamics of an objective lens actuator in order to predict stability in a tracking servo system. The effect of the elastic deformation modes of the housing was formularized as the incident angle deviation and was calculated by adding and subtracting the products of a ray transfer matrix chain representing the transfer from each optical component to the objective lens with its small displacement and tilt vector. This new vibration model reproduced an increased gain around a frequency of 20 kHz in the measured open-loop transfer function of the tracking servo system with 4% error in frequency, which was entirely unexpected in the context of existing vibration models for optical pickups. The calculated results also identified the most influential vibration modes of the housing and estimated the effectiveness of stiffening the housing with 17% error.
format	article
author	Manabu OCHI Katsuhiko KIMURA Mitsuo SATAKE
author_facet	Manabu OCHI Katsuhiko KIMURA Mitsuo SATAKE
author_sort	Manabu OCHI
title	Analysis of beam spot deviation considering vibration of components in optical pickup
title_short	Analysis of beam spot deviation considering vibration of components in optical pickup
title_full	Analysis of beam spot deviation considering vibration of components in optical pickup
title_fullStr	Analysis of beam spot deviation considering vibration of components in optical pickup
title_full_unstemmed	Analysis of beam spot deviation considering vibration of components in optical pickup
title_sort	analysis of beam spot deviation considering vibration of components in optical pickup
publisher	The Japan Society of Mechanical Engineers
publishDate	2018
url	https://doaj.org/article/761cfa49bb0840dab6c01e0b5eac6c3d
work_keys_str_mv	AT manabuochi analysisofbeamspotdeviationconsideringvibrationofcomponentsinopticalpickup AT katsuhikokimura analysisofbeamspotdeviationconsideringvibrationofcomponentsinopticalpickup AT mitsuosatake analysisofbeamspotdeviationconsideringvibrationofcomponentsinopticalpickup
_version_	1718409726029463552

Analysis of beam spot deviation considering vibration of components in optical pickup

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