Results 211 to 220 of about 3,266,597 (259)
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A New Methodology for Optical Sensing and Identification Using Optical-Disc Drives
Proceedings of SPIE, 2011Optical disc drives are inexpensive, readily available, and use highly sophisticated optoelectronic components which can be adapted for sensing. One limitation of using compact discs (CDs) and optical disk drives for sensing of analytes placed on a CD is the fluctuations in the voltage signal from the disk drive generated while reading the data on ...
Samuel Schaefer, Kenneth J. Chau
exaly +2 more sources
Performance of Automatic Ball Balancers on Optical Disc Drives
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2002The balancing performance of an automatic ball balancer fitted on the spindle motor of optical disc drives, for instance CD-ROM or DVD drives, is analysed. It is well known that the operating speed of an optical disc drive with an automatic ball balancer should be higher than the translational natural frequency of the system to be balanced.
W Kim, J Chung
exaly +2 more sources
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
exaly +2 more sources
Digital Servo IC for Optical Disc Drives
IFAC Proceedings Volumes, 2000Abstract This paper addresses the use of PID regulators to achieve some of the main control goals in an optical disc drive: (i) focusing of the laser spot on the disc surface, (ii) tracking the continuous data spiral during playback, and (iii) radially searching the target location on disc during an access procedure.
Ton H Akkermans, Sorin G Stan
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Optical Disc Drives: A Study of Variation
Nonlinear Optics, 2011Optical disc drives vary significantly in their performance. Here we report a principal components analysis performed on data from new drives, which separates out the better performing drives and finds correlations among drive test variables.
Guilin Jiang +3 more
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Optical Disc for Small Form Factor Optical Drive
Japanese Journal of Applied Physics, 2005We investigated the signal characteristics of a 46 mm small optical disk in a blue laser system [laser wavelength, 405 nm; numerical aperture (NA), 0.85]. To determine the physical dimensions of the rim area of the disk, we considered some factors affecting this rim area.
Myong-do Ro +4 more
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Development of optical pickup for mini disc drives
Optical Review, 1994In order to miniaturize optical disc drives, it is important to miniaturize and thin the optical pickup. We have developed two new optical parts: the hologram laser and the actuator. By optimizing the hologram pattern of the hologram laser, optical path length is shortened. The frequency characteristics of the actuator have been stabilized by improving
Yoshihiro Sekimoto +4 more
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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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Digital control in optical disc drives
ICCE. International Conference on Consumer Electronics (IEEE Cat. No.01CH37182), 2002This paper deals with digital control in read-only and recordable optical disc systems such as CD audio/video, CD-ROM, CD-R/RW and DVD-R/RW. Since 1993, the rapidly growing data storage device market has forced fast system upgrades and new systems for extremely low market prices.
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Miniaturized Optical Pickup and Mechanism for Mobile Optical Disc Drive
Japanese Journal of Applied Physics, 2004Recently, the market for portable instruments has been increasing markedly. If a very small optical disc drive can be realized, it is expected that a new market for memories will be created, because the running cost of an optical disc is very low. The main issues in such realization are miniaturization of a loading mechanism with a disc cartridge ...
Mitsuhiro Togashi +3 more
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