Results 231 to 240 of about 68,807 (272)
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Cooling Design for the Next Generation Optical Disc Drive
ASME 2007 InterPACK Conference, Volume 2, 2007Recently, the data transfer rate and the memory capacity of optical disc drives have been increasing dramatically. To obtain the high data transfer rate and greater memory capacity, the disc rotation speed and the laser power also need to be increased and these cause an increase in the temperature of the laser diode.
Takayuki Fujimoto +5 more
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Track jump scheme without controller switching in optical disc drives
2008 International Conference on Control, Automation and Systems, 2008Track jump control is a random access strategy applied to short distance movement less than 10 tracks. The most common track jump scheme is a bang-bang control of a kick and brake manner. In a conventional track jump scheme, a track-following controller is turned off during kick and brake periods, and restarted at a target track for track pull-in.
Jung Rae Ryoo, Tae-Yong Doh
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A Study on Flow Fields in an Optical Disc Drive
Transactions of the Korean Society of Mechanical Engineers B, 2005The present study investigates flow characteristics in an optical disc drive (ODD). Detailed knowledge of the flow characteristics is essential to analyze flow-induced noise and vibration, forced convection and flow friction loss. The ODD used in a personal computer is used for the experiment and rotating velocity of disc is under the 4500 rpm.
Ji Won Jung +2 more
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Optical disc drives — the breakthrough in data storage
Electronics and Power, 1983The application of video-disc-type technology to mass data storage promises a storage density at worst egual to that of the most advanced magnetic-based systems. This article provides an introduction to optical disc drives, highlighting a recent introduction from the ...
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Three‐axis balanced driving‐type optical head for high‐density optical disc player
Electronics and Communications in Japan (Part II: Electronics), 1994AbstractIn the optical disc player, there is a necessity to correct the jitter caused by the disc eccentricity and rotation irregularity as well as focusing. For this correction, there are both the electrical correction method using a two‐axis optical head with memory and the mechanical correction method of a three‐axis optical head. If the goal is the
Tsutornu Matsui +3 more
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A study on optical pickup actuator for small form-factor optical disc drives
Mechatronics, 2009Optical disc drives (ODDs) such as CD, DVD and HD-DVD are cheaper and more distributable than solid-state memories and hard disc drives (HDDs). In the era of mobile environment, ultra-slim ODDs have been studied and developed to show the feasibility of mobile application.
Kyung Taek Lee, Sam-Nyol Hong
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Japanese Journal of Applied Physics, 1998
Digital versatile discs (DVDs) promise to provide excellent multimedia storage for both entertainment and computer use. In this paper, we report a newly designed optical module for use in DVD systems. It consists of a laser diode chip, a photodiode chip, a compound prism, and a double-sided polarizing diffractive optical element ...
Tsuyoshi Nagano +3 more
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Digital versatile discs (DVDs) promise to provide excellent multimedia storage for both entertainment and computer use. In this paper, we report a newly designed optical module for use in DVD systems. It consists of a laser diode chip, a photodiode chip, a compound prism, and a double-sided polarizing diffractive optical element ...
Tsuyoshi Nagano +3 more
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Discrete-time sliding mode control of optical disc drive tracking loop
6th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service, 2003. TELSIKS 2003., 2004The paper deals with the control of optical disc drive radial tracking loop using the discrete-time sliding mode control based on generalized minimum variance control techniques. By adding a sliding mode component, the tracking performance is improved in the presence of disturbances.
D.B. Mitic, P.D. Vukovic
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Design of a Write-Once Optical Disc Drive Head
SPIE Proceedings, 1987The design of a write-once-read-multiple optical disc drive head using an 780 nm 20 mW diode laser is presented. To achieve high density data storage, the laser is collimated and aberration corrected before it is focused by a .50 NA objective lens onto the disc.
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Track jump scheme using internal state manipulation in optical disc drives
IEEE Transactions on Consumer Electronics, 2009Track jump control is a random access strategy applied to short distance movement less than 10 tracks. The most common track jump scheme is a bang-bang control of a kick and brake manner. In a conventional track jump scheme, a track-following controller is turned off during kick and brake periods, and restarted at a target track for track pull-in.
Jung Ryoo, Tae-Yong Doh
openaire +1 more source