Results 221 to 230 of about 68,807 (272)

Development of optical pickup for mini disc drives

Optical Review, 1994
In 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, Nobuo Ogata, Yasuo Nakata, Hideaki Sato, Toshio Ishikawa   +4 more
openaire   +1 more source

An increased capacity DataPlay optical disc and drive

SPIE Proceedings, 2004
Based on new market opportunities for consumer electronics devices DataPlay has designed a new version small form-factor optical disc and drive featuring a capacity of 750MB per disc as compared to 500MB per disc of the original product. The NA of the optical pickup has been increased from 0.60 to 0.72.
David L. Blankenbeckler, Bernard W. Bell, Jr., David H. Davies, Lane W. Lee   +3 more
openaire   +1 more source

Drive system and readout characteristics of Micro-Reflector optical disc

Optical Data Storage, 2007
This paper reviews the analyses and the experimental results of Micro-reflector optical disc system. In Micro-reflector optical disc, data are recorded on multiple virtual planes in a monolithic holographic medium. We have demonstrated the possibility of huge capacity from our analyses of readout characteristics of the Micro-reflector.
Kimihiro Saito, Toshihiro Horigome, Hirotaka Miyamoto, Hisayuki Yamatsu, Norihiro Tanabe, Kunihiko Hayashi, Goro Fujita, Seiji Kobayashi, Takao Kudo, Hiroshi Uchiyama   +9 more
openaire   +1 more source

Digital control in optical disc drives

ICCE. International Conference on Consumer Electronics (IEEE Cat. No.01CH37182), 2002
This 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.
openaire   +1 more source

Classifying disc defects in optical disc drives by using time-series clustering

Proceedings of the 2004 American Control Conference, 2004
Optical disc drives are subject to various disturbances and faults. A special type of fault is the so-called disc defect. In this paper we present an approach for disc defect classification. It is based on hierarchical clustering of measured signals that are affected by disc defects.
J. van Helvoirt, G.A.L. Leenknegt, M. Steinbuch, H.J. Goossens   +3 more
openaire   +1 more source

Fast-Settling Control for Optical Disc Drives

IEEJ Transactions on Industry Applications, 2008
A fast-settling control method for the fine actuator system in an optical disc drive has been developed. The fast-settling control is performed by two-degree-of-freedom control, which uses the reference trajectory. The reference trajectory according to the initial state at mode switching between seeking and settling is determined by using a final-state
openaire   +1 more source

An advanced guide feeding system for optical disc drives

Microsystem Technologies, 2014
The rotational speed of some optical disc drives (ODDs) has recently exceeded 15,000 rpm due to demand for high data-transfer rates. At these high speeds, the guide feeding system must maintain control over the optical pickup under hard acceleration and deceleration in random access operation for both read and write processes.
Wonseok Oh, Kyoung-Su Park
openaire   +1 more source

Performance of automatic ball balancers on optical disc drives

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2002
The 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
openaire   +1 more source

Designing Center Error Control in Optical Disc Drive Systems

Japanese Journal of Applied Physics, 2001
In this paper, the feedback control system for controlling the center error which represents the vibration of the object lens of the pick-up during the movement of the coarse actuator is considered. The center error signal measured from the push-pull signal is corrupted by the track-cross noise, which degrades the control performance.
Kyung-Soo Kim Kyung-Soo Kim, Seong-Pyo Hong Seong-Pyo Hong   +1 more
openaire   +1 more source

A new methodology for optical sensing and identification using optical-disc drives

SPIE Proceedings, 2011
Optical 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
openaire   +1 more source