H. Watanabe, E. Koyama, T. Nunomura, T. Taii, T. Iida, M. Miura, A. Gotoh, T. Nishida, S. Horigome, N. Ohta
12" W-O type optical disks are used for large capacity archival data storage system. To extend application area more widely both larger data capacity and higher data transfer rate are required. Such a high density disk also requires more advanced reliability and durability. This paper describes double sided 7GB twelve inch diameter disk for high data rate (1.2-2.2MB/s) application keeping disk life longer than 45 years. User data capacity is advanced using pit-edge method1) and MCAV(Modified Constant Angular velocity) method. Corrosion resistant Te alloy recording layer has high signal to noise ratio, and wide jitter margin. High rotation speed makes data transfer rate higher. Acceleration test shows high reliability.
{"title":"Highly Reliable 7GB, 1.2-2.2MB/S Twelve inch Write Once Optical Disk","authors":"H. Watanabe, E. Koyama, T. Nunomura, T. Taii, T. Iida, M. Miura, A. Gotoh, T. Nishida, S. Horigome, N. Ohta","doi":"10.1364/ods.1991.mb2","DOIUrl":"https://doi.org/10.1364/ods.1991.mb2","url":null,"abstract":"12\" W-O type optical disks are used for large capacity archival data storage system. To extend application area more widely both larger data capacity and higher data transfer rate are required. Such a high density disk also requires more advanced reliability and durability. This paper describes double sided 7GB twelve inch diameter disk for high data rate (1.2-2.2MB/s) application keeping disk life longer than 45 years. User data capacity is advanced using pit-edge method1) and MCAV(Modified Constant Angular velocity) method. Corrosion resistant Te alloy recording layer has high signal to noise ratio, and wide jitter margin. High rotation speed makes data transfer rate higher. Acceleration test shows high reliability.","PeriodicalId":408950,"journal":{"name":"Optical Data Storage Topical Meeting","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117069943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Karis, M. Best, J. Logan, J. R. Lyerla, R. T. Lynch, R. McCormack
Certain optical data systems rely upon the ability of the laser to accurately track along grooves in the substrate. The topography and physical properties of the substrate, laser beam characteristics (wavelength, spot size), and physical optics of the optical head all play a role in determining whether tracking is possible on a given optical disk. The effects of each of these variables can be found by modelling the disk as a phase surface which modulates the phase of the incident laser light. Scalar diffraction thcory[l,2] can be used to predict the reflected light intensity as a function of position across the disk for a given system. It is then possible to predict the servo signals which are used for tracking. The primary substrate parameters which affect these tracking signals are the groove depth, the relative widths of the groove and land (duty cycle), the track pitch, the refractive index, and the groove topography. All of these disk properties, excluding the refractive index, are found using Scanning Tunneling Microscopy (STM)[3]. This gives a detailed three dimensional surface profile for the disk which is then used in the theoretical calculation of the tracking servo signals. These calculated values are compared to actual experimental data obtained using an optical disk tester. Disks were measured which have varying depth and varying track pitch at fixed depth.
{"title":"Tracking Servo Signal Simulation from STM Surface Profiles","authors":"T. Karis, M. Best, J. Logan, J. R. Lyerla, R. T. Lynch, R. McCormack","doi":"10.1364/ods.1991.wb6","DOIUrl":"https://doi.org/10.1364/ods.1991.wb6","url":null,"abstract":"Certain optical data systems rely upon the ability of the laser to accurately track along grooves in the substrate. The topography and physical properties of the substrate, laser beam characteristics (wavelength, spot size), and physical optics of the optical head all play a role in determining whether tracking is possible on a given optical disk. The effects of each of these variables can be found by modelling the disk as a phase surface which modulates the phase of the incident laser light. Scalar diffraction thcory[l,2] can be used to predict the reflected light intensity as a function of position across the disk for a given system. It is then possible to predict the servo signals which are used for tracking. The primary substrate parameters which affect these tracking signals are the groove depth, the relative widths of the groove and land (duty cycle), the track pitch, the refractive index, and the groove topography. All of these disk properties, excluding the refractive index, are found using Scanning Tunneling Microscopy (STM)[3]. This gives a detailed three dimensional surface profile for the disk which is then used in the theoretical calculation of the tracking servo signals. These calculated values are compared to actual experimental data obtained using an optical disk tester. Disks were measured which have varying depth and varying track pitch at fixed depth.","PeriodicalId":408950,"journal":{"name":"Optical Data Storage Topical Meeting","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131244440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
First generation magneto-optic (MO) disks have been on the commercial stage advancing their standardizations. To introduce the next generation, development activities are focused on overwritable optical disk technologies such as magnetic modulation or the use of multilayer recording material.1)
{"title":"3-Beam Overwritable Magneto-Optic Disk Drive","authors":"A. Watabe, I. Yamada, M. Yamamoto, K. Katoh","doi":"10.1364/ods.1991.tub5","DOIUrl":"https://doi.org/10.1364/ods.1991.tub5","url":null,"abstract":"First generation magneto-optic (MO) disks have been on the commercial stage advancing their standardizations. To introduce the next generation, development activities are focused on overwritable optical disk technologies such as magnetic modulation or the use of multilayer recording material.1)","PeriodicalId":408950,"journal":{"name":"Optical Data Storage Topical Meeting","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121326210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The next generation optical disk drives need to realize shorter access time, higher data transfer rate and higher information density than the present ones. To realize each requirement, several methods were proposed and estimated, for example, usage of visible laser sources[1], multi-beam lasers[2,3], a split-type head structure[4] and so on. Although a split-type optical head with two or more light sources may be one of good solutions, it is not easy to control plural spots on an information track precisely and simultaneously in case of continuously-grooved disks. To solve this problem, we proposed a simple tracking method with composed the conventional twin-spot and push-pull tracking methods[5].
{"title":"A New Tracking Method for 2-Beam Optical Heads Using Continuously Grooved Disks","authors":"M. Irie, N. Takeshita, T. Fujita, K. Kime","doi":"10.1364/ods.1991.wb5","DOIUrl":"https://doi.org/10.1364/ods.1991.wb5","url":null,"abstract":"The next generation optical disk drives need to realize shorter access time, higher data transfer rate and higher information density than the present ones. To realize each requirement, several methods were proposed and estimated, for example, usage of visible laser sources[1], multi-beam lasers[2,3], a split-type head structure[4] and so on. Although a split-type optical head with two or more light sources may be one of good solutions, it is not easy to control plural spots on an information track precisely and simultaneously in case of continuously-grooved disks. To solve this problem, we proposed a simple tracking method with composed the conventional twin-spot and push-pull tracking methods[5].","PeriodicalId":408950,"journal":{"name":"Optical Data Storage Topical Meeting","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130604967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The bandwidth of high definition television signal is too wide to record the signal on the disc for a long time. Adopting the MUSE (Multiple Sub-Nyquist Sampling Encording) signal, which is band-width compressed to about 8 MHz, to solve the ploblem, we had developed an HDTV videodisc of 30 minutes per side and player for the profesional use. However, in order to introduce MUSE videodisc to consumer market in the future, the playback time per side is required to be at least 60 min. To realize a playback time of 60 minutes, the authors have developed disc recording system and playback system which handle the high density videodisc.
{"title":"High Density Optical MUSE Disc","authors":"Y. Tsuchiya, H. Terasaki, O. Ota","doi":"10.1364/ods.1991.wd6","DOIUrl":"https://doi.org/10.1364/ods.1991.wd6","url":null,"abstract":"The bandwidth of high definition television signal is too wide to record the signal on the disc for a long time. Adopting the MUSE (Multiple Sub-Nyquist Sampling Encording) signal, which is band-width compressed to about 8 MHz, to solve the ploblem, we had developed an HDTV videodisc of 30 minutes per side and player for the profesional use. However, in order to introduce MUSE videodisc to consumer market in the future, the playback time per side is required to be at least 60 min. To realize a playback time of 60 minutes, the authors have developed disc recording system and playback system which handle the high density videodisc.","PeriodicalId":408950,"journal":{"name":"Optical Data Storage Topical Meeting","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132734917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We found two key attributes of cycle stability for phase change erasable disc media. One is nitrogen modified active layer of GeTe-Sb2Te3-Sb system. The other is the combination of dielectric material of ZnS-SiO2 mixture and SiO2. The disc media having the modified active layer and ZnS-SiO2 dielectric layer show wide tolerance for laser power and long life of more than 60 years. New disc construction shows two million overwrite cycle stability of BER characteristics.
{"title":"Erasable Phase Change Media","authors":"T. Ohta","doi":"10.1364/ods.1991.tua1","DOIUrl":"https://doi.org/10.1364/ods.1991.tua1","url":null,"abstract":"We found two key attributes of cycle stability for phase change erasable disc media. One is nitrogen modified active layer of GeTe-Sb2Te3-Sb system. The other is the combination of dielectric material of ZnS-SiO2 mixture and SiO2.\u0000 The disc media having the modified active layer and ZnS-SiO2 dielectric layer show wide tolerance for laser power and long life of more than 60 years. New disc construction shows two million overwrite cycle stability of BER characteristics.","PeriodicalId":408950,"journal":{"name":"Optical Data Storage Topical Meeting","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132333189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Yasukawa, D. Iguchi, S. Yamaguchi, A. Murakami, T. Nomiyama, K. Takahashi, K. Ueyanagi
We have developed a flying optical head to attain high speed accessing which is the important issue in applying optical disks for computer file memories1)2). This time, we studied direct seeking technology with the flying optical head and successfully applied the technology for 90mm magneto-optical disks.
{"title":"10ms direct seeking of 90mm magneto-optical disk with flying optical head","authors":"K. Yasukawa, D. Iguchi, S. Yamaguchi, A. Murakami, T. Nomiyama, K. Takahashi, K. Ueyanagi","doi":"10.1364/ods.1991.tuc3","DOIUrl":"https://doi.org/10.1364/ods.1991.tuc3","url":null,"abstract":"We have developed a flying optical head to attain high speed accessing which is the important issue in applying optical disks for computer file memories1)2). This time, we studied direct seeking technology with the flying optical head and successfully applied the technology for 90mm magneto-optical disks.","PeriodicalId":408950,"journal":{"name":"Optical Data Storage Topical Meeting","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128758253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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