ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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22.10
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: February 06, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.10.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: February 06, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.10.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • The Piggyback Actuator for Ultra-high Track Density HDD
    Y. Uematsu
    Article type: Article
    Pages 1-8
    Published: February 06, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.10.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Keeping the increase rate of the HDD storage area density, the improvement of the high TPI technology should be achieved more than that of the high BPI, because of the transfer capability of electronics, the write capability of the recording head, the magnetic thermal fluctuation and so on. So the track pitch less than 1 micron-meter demands the extreme accuracy of head positioning. One of the most important issue is the tracking accurately by the new piggyback actuator. There are three generations among piggyback actuators. Cost and manufacturability are quite tough issues.
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  • Pivot Friction Compensation Using an Accelerometer and a Disturbance Observer for Hard Disk Drives
    Jun Ishikawa, Masayoshi Tomizuka
    Article type: Article
    Pages 9-16
    Published: February 06, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.10.0_9
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This report is concerned with the compensation of pivot bias in hard disk drives by a combined use of an accelerometer and a disturbance observer (DOB). Since the proposed method can be implemented as an analog system, it provides wider bandwidth control compared with traditional digital bias compensation scheme such as an integral action. The difference is demonstrated by a sequence of O.5msec head positioning. The probability that the tracking error at the end of each positioning is within ±5% of the track pitch has been improved from 0.35 (an integral action) to 0.80.
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  • Optical System and Focusing Method in a Multi-Beam Head for Optical Tape Recording
    Kiyotaka Arai, Hideyo Okumura, Norikazu Kawamura, Shin-ichi Yoshimura, ...
    Article type: Article
    Pages 17-22
    Published: February 06, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.10.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
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    An optical tape recording system using a rotating optical head is being developed in order to realize a small-sized video storage with large capacity. To record and retrieve high quality moving pictures for broadcasting use, high bit recording is necessary. Among the methods to meet this requirement, parallel recording is the most effective way. With an experimental multi-beam head utilizing a four-beam laser diode array, we have successfully realized an optical system to keep the spot intervals on the optical tape constant and a precise focus control method. The performance of the head was confirmed by recording experiments.
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  • Development of High Speed Tape Transfer Technology for Digital VTR
    Chiaki Yamawaki, Masaji Nakatani, Shigeaki Kakiwaki, Hitoshi Takeuchi, ...
    Article type: Article
    Pages 23-28
    Published: February 06, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.10.0_23
    CONFERENCE PROCEEDINGS FREE ACCESS
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    For high speed search system of the video cassette reorder, the precision tape speed control, tape tension control and digital data detection are required. We have studied high speed tape transport mechanism, using directly driven take-up and supply reels and controlling both reels by using the decoupling control of tape speed and tape tension. And we have developed a new method for decuopling control of tape tension in witch tape running resistance by tape guide is taken into consideration. Furthermore, in the control of phase locked loop center frequency offset, we have employed a new method that controls reproducing signal frequency deviation by correlation of tape search speed and head azimuth angle, and relative tape-head speed. As a result the system obtained the high performance of data detection in accordance with the digital VCR standard.
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  • A Study on Tape Tension Control for Belt-Driven Tape Transport system
    Haruo Kasai, Daiichiro Kato, Yukichi Miyata
    Article type: Article
    Pages 29-34
    Published: February 06, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.10.0_29
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Research is being conducted on a high-speed tape transport system suitable for a thin tape as part of the effort to increase the volume-recording density and reduce search time. This study investigated the control of tape tension when running a thin tape with a belt-driven tape transport system used for a computer storage. In a belt-driven tape transport system, it is known that a thinner tape must support a greater burden because of the big changes in tape tension at the start and finish of tape winding. Our study established that tape tension control to reduce such tension can be achieved by altering the belt-winding angle, moving the position of the belt roller on the supply-reel side. The results show that the stable and high-speed transport of a thin tape is possible.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: February 06, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.10.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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