Analysis showed that the servo system should have less than 0.4 um dynamic focus error. This accuracy could be guaranteed with a standard high bandwidth second order loop with lead lag compensation and a low frequency integrator. In the electronic design attention has been paid to avoid signal saturation during seeks due to optical crosstalk between the focus and the tracking channel. This crosstalk is discussed in a companion paper.(2) A measurement of the focus loop transfer function can be found in figure 1.
{"title":"An Interactive Multiple Servo System for an Optical/Digital Drive","authors":"K. W. Getreuer, T. E. Berg, J. Hulshof","doi":"10.1364/ods.1984.fcb1","DOIUrl":"https://doi.org/10.1364/ods.1984.fcb1","url":null,"abstract":"Analysis showed that the servo system should have less than 0.4 um dynamic focus error. This accuracy could be guaranteed with a standard high bandwidth second order loop with lead lag compensation and a low frequency integrator. In the electronic design attention has been paid to avoid signal saturation during seeks due to optical crosstalk between the focus and the tracking channel. This crosstalk is discussed in a companion paper.(2) A measurement of the focus loop transfer function can be found in figure 1.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"1 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":"132669844","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}
Kodak's 14" optical disk drive uses Run-Length-Limited (RLL) encoding techniques to increase the in-track packing density. In a pulse length encoding scheme using RLL codes, the clock and data are encoded in the mark edges and not in the mark itself. The use of such encoding schemes allows an increase in the in-track density over pulse position encoding techniques. The price of using this technique is that the CNR and linearity of the media must be consistent and of high quality.
{"title":"Head Media Interface Tolerancing Kodak Optical Head & Kodak LWR Media","authors":"J. J. Miceli, Scott B. Chase, Scott A. Gerger","doi":"10.1364/ods.1987.tha3","DOIUrl":"https://doi.org/10.1364/ods.1987.tha3","url":null,"abstract":"Kodak's 14\" optical disk drive uses Run-Length-Limited (RLL) encoding techniques to increase the in-track packing density. In a pulse length encoding scheme using RLL codes, the clock and data are encoded in the mark edges and not in the mark itself. The use of such encoding schemes allows an increase in the in-track density over pulse position encoding techniques. The price of using this technique is that the CNR and linearity of the media must be consistent and of high quality.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"18 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":"133244534","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 world's requirements for the storage of digitized information is increasing at a compound annual growth rate of 30 to 35% per year. Optical storage systems offer a logical alternative for many current and future applications in the scientific and business environments. A write-once optical recording system has been developed that offers both high capacity (6.8 gigabytes per disk) and high user data rate (maximum of 1.0 megabyte per second at the disk). The media is based on an organic dye/binder recording layer, coated on a 14-inch aluminum substrate and protected with a thin off-spaced cover sheet. The optical disk recorder is coupled with an intelligent controller that supports SCSI and IPI-3 interfaces. An overview of Eastman Kodak Company's approach to large optical recording systems will be discussed.
{"title":"The Kodak Optical Storage System","authors":"R. Graham","doi":"10.1364/ods.1987.tha1","DOIUrl":"https://doi.org/10.1364/ods.1987.tha1","url":null,"abstract":"The world's requirements for the storage of digitized information is increasing at a compound annual growth rate of 30 to 35% per year. Optical storage systems offer a logical alternative for many current and future applications in the scientific and business environments. A write-once optical recording system has been developed that offers both high capacity (6.8 gigabytes per disk) and high user data rate (maximum of 1.0 megabyte per second at the disk). The media is based on an organic dye/binder recording layer, coated on a 14-inch aluminum substrate and protected with a thin off-spaced cover sheet. The optical disk recorder is coupled with an intelligent controller that supports SCSI and IPI-3 interfaces. An overview of Eastman Kodak Company's approach to large optical recording systems will be discussed.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","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":"131833525","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}
C. Chung, M. Alexander, D. Evanicky, C. W. Harrison
The 3M Optical Recording media consists of four essential layers. This quadri-layer structure is shown to be fundamentally stable in severe temperature and humidity environments. The impact of pregrooved plastic substrate materials on the stability of this structure is discussed.
{"title":"Stability of 3M Draw Optical Recording Media","authors":"C. Chung, M. Alexander, D. Evanicky, C. W. Harrison","doi":"10.1364/ods.1984.thcb1","DOIUrl":"https://doi.org/10.1364/ods.1984.thcb1","url":null,"abstract":"The 3M Optical Recording media consists of four essential layers. This quadri-layer structure is shown to be fundamentally stable in severe temperature and humidity environments. The impact of pregrooved plastic substrate materials on the stability of this structure is discussed.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"17 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":"134065377","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}
M. Nakajima, M. Hamada, M. Moribe, H. Hirano, K. Itoh, S. Ogawa
Improvement of carrier to noise ratio (C/N) is one of the most important problems of optical disk media.
提高载波噪声比(C/N)是光盘介质的重要问题之一。
{"title":"Reduction of Media Noise in Optical Disks","authors":"M. Nakajima, M. Hamada, M. Moribe, H. Hirano, K. Itoh, S. Ogawa","doi":"10.1364/ods.1985.thcc5","DOIUrl":"https://doi.org/10.1364/ods.1985.thcc5","url":null,"abstract":"Improvement of carrier to noise ratio (C/N) is one of the most important problems of optical disk media.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"28 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":"130373370","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}
Amorphous CoGd films proposed for magneto-optic recording1 lack sufficient coercivity, HC, to support sub-micron domains. Amorphous CoGdTb films having low Tb substitution and prepared by r.f. sputtering have magnetic properties similar to CoGd films2. However CoGdTb films have increased HC enabling them to support submicron domains3, 4. CoGdTb films were prepared under a variety of sputtering conditions and characterized for their thermomagnetic/magneto-optic recording application. The influence of substrate bias voltage, VBias, and argon partial pressure, PAr, used during fabrication were determined.
{"title":"Magnetic Properties of CoGdTb Thin Films for Thermo-Magnetic/Magneto-Optic Recording","authors":"D. Hairston, M. Kryder","doi":"10.1364/ods.1985.tubb4","DOIUrl":"https://doi.org/10.1364/ods.1985.tubb4","url":null,"abstract":"Amorphous CoGd films proposed for magneto-optic recording1 lack sufficient coercivity, HC, to support sub-micron domains. Amorphous CoGdTb films having low Tb substitution and prepared by r.f. sputtering have magnetic properties similar to CoGd films2. However CoGdTb films have increased HC enabling them to support submicron domains3, 4. CoGdTb films were prepared under a variety of sputtering conditions and characterized for their thermomagnetic/magneto-optic recording application. The influence of substrate bias voltage, VBias, and argon partial pressure, PAr, used during fabrication were determined.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"1 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":"132030771","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}
An erasable bilayer organic dye-polymer optical recording medium has been developed which provides high CNR performance and the prospect for long archival data integrity. Media operation utilizes separate lasers for the write (λ=840nm) and the erase (λ=780nm) processes. This paper will include a description of media operation and a summary of preliminary test results.
{"title":"Erasable Bilayer Dye-Polymer Optical Recording Medium","authors":"J. Hartman, M. A. Lind","doi":"10.1364/ods.1987.fa4","DOIUrl":"https://doi.org/10.1364/ods.1987.fa4","url":null,"abstract":"An erasable bilayer organic dye-polymer optical recording medium has been developed which provides high CNR performance and the prospect for long archival data integrity. Media operation utilizes separate lasers for the write (λ=840nm) and the erase (λ=780nm) processes. This paper will include a description of media operation and a summary of preliminary test results.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","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":"131783999","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}
Antireflective thin film structures(1) have been used advantageously in write – once(2)(3) and reversible phase change(4) materials design to provide increased sensitivity, better marking contrast and to amplify the optical effects of small laser-induced marking effects. The same structures may be used in magneto-optic recording to increase the shot-noise-limited figure of merit R½ΘK for Kerr readout. Previous reports have analyzed the effects of single quarter-wave overlayers(5) and more powerful approaches such as the encapsulated trilayer (quadrilayer)(6). This paper will present a comprehensive analysis of the various approaches to antireflection structures and their relative enhancement capabilities for shot noise limited magneto-optic readout.
{"title":"Antireflection Structures for Magneto-Optic Recording","authors":"A. Bell","doi":"10.1364/ods.1987.thd2","DOIUrl":"https://doi.org/10.1364/ods.1987.thd2","url":null,"abstract":"Antireflective thin film structures(1) have been used advantageously in write – once(2)(3) and reversible phase change(4) materials design to provide increased sensitivity, better marking contrast and to amplify the optical effects of small laser-induced marking effects. The same structures may be used in magneto-optic recording to increase the shot-noise-limited figure of merit R½ΘK for Kerr readout. Previous reports have analyzed the effects of single quarter-wave overlayers(5) and more powerful approaches such as the encapsulated trilayer (quadrilayer)(6). This paper will present a comprehensive analysis of the various approaches to antireflection structures and their relative enhancement capabilities for shot noise limited magneto-optic readout.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"86 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":"131815892","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. Itao, S. Hara, A. Watabe, H. Nakanishi, Yamamoto Manabu
A high data transfer rate and high speed accessing optical disk drive has been developed for its application to the information processing for the office automation, with the performance capabilities summerized in Table 1. The 130 mm diameter disk holds 520 MB of user data on both side. The composite continuous groove track format is adopted in order to realize the fast track counting and accessing.
{"title":"High Data Transfer Rate and High Speed Accessing Optical Disk Drive Technology","authors":"K. Itao, S. Hara, A. Watabe, H. Nakanishi, Yamamoto Manabu","doi":"10.1364/ods.1987.fb1","DOIUrl":"https://doi.org/10.1364/ods.1987.fb1","url":null,"abstract":"A high data transfer rate and high speed accessing optical disk drive has been developed for its application to the information processing for the office automation, with the performance capabilities summerized in Table 1. The 130 mm diameter disk holds 520 MB of user data on both side. The composite continuous groove track format is adopted in order to realize the fast track counting and accessing.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"28 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":"133889442","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}
D. Kowalski, Tu Chen, Charles W. DePuy, D. Treves, G. Sitts, L. Klinger, D. J. Curry, R. Sprague
A portable highly stable air bearing magneto-optic tester is described that has been used to evaluate first and second surface media. The system was designed to handle 14 and 12 inch diameter disks with inner diameter holes similar to magnetic disks. Disk substrates made of glass, plastic, or aluminum can be tested at spin rates in the range of 200 to 3600 RPM. Two electromagnets are built into the tester. One is used to saturate the media and another to supply the write and erase field. A single optical head is used to write and read out data. The disk drive system is built of heavy aluminum plates in the form of a compact cage. An air bearing spindle driven by a brushless dc motor is used to spin the disk. The disk runs over the optics module in an inverted configuration selected to minimize the problem of dust settling on first surface media and to provide the means of working with smaller diameter disks. An air bearing slide is used to move the optical head. This slide is driven by a Compumotor stepper motor through a precision V-nut and screw. The stepper motor and controller combination can achieve a resolution of 1/20 micrometer per step. The stability of the media tester with glass disks is such that it can sit on a written one micrometer wide track for onver 30 minutes without noticing any degrading effect on the output signal.
{"title":"High Data Rate Erasable Magneto-Optic Media Tester","authors":"D. Kowalski, Tu Chen, Charles W. DePuy, D. Treves, G. Sitts, L. Klinger, D. J. Curry, R. Sprague","doi":"10.1364/ods.1984.thcc2","DOIUrl":"https://doi.org/10.1364/ods.1984.thcc2","url":null,"abstract":"A portable highly stable air bearing magneto-optic tester is described that has been used to evaluate first and second surface media. The system was designed to handle 14 and 12 inch diameter disks with inner diameter holes similar to magnetic disks. Disk substrates made of glass, plastic, or aluminum can be tested at spin rates in the range of 200 to 3600 RPM. Two electromagnets are built into the tester. One is used to saturate the media and another to supply the write and erase field. A single optical head is used to write and read out data. The disk drive system is built of heavy aluminum plates in the form of a compact cage. An air bearing spindle driven by a brushless dc motor is used to spin the disk. The disk runs over the optics module in an inverted configuration selected to minimize the problem of dust settling on first surface media and to provide the means of working with smaller diameter disks. An air bearing slide is used to move the optical head. This slide is driven by a Compumotor stepper motor through a precision V-nut and screw. The stepper motor and controller combination can achieve a resolution of 1/20 micrometer per step. The stability of the media tester with glass disks is such that it can sit on a written one micrometer wide track for onver 30 minutes without noticing any degrading effect on the output signal.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"28 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":"132642325","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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