E. LaBudde, C. Shevlin, R. LaBudde, Charles Carlino
The development of an optical disk media suitable for applications in the computer industry requires the development of very high performance optical media and disk drive systems. Of major importance is the development of a media with sufficient sensitivity to be used with commercially available low cost and reliable lasers along with long life and reliability of data recoveries after extended periods of storage times. The overall performance of an optical disk is principally determined by the basic overall design as well as the selection of materials and processes used to manufacture the disk. Of particular importance is the need to develop a disk that has a highly stable operating performance in a wide range of environments, in particular the necessity to protect the recording layer from dust and other contaminations is critical in the error rate performance. This paper describes an overall disk design which promises to meet the stringent performance requirements for a computer compatible optical disk system. In addition, a relatively simple overall thermal and optical model will be developed to describe the behavior of the physical principles involved in the optical recording processes. This paper additionally will provide collaborating test and experimental evidence to confirm the validity of the analytical models. The significance of this paper involves the reporting of a full-up disk design, analytical models, and experimental evidence to confirm that a new disk design has been successfully achieved which promises to meet a high performance application.
{"title":"Some Calculations On A Hole Forming Mechanism Compatible With An In-Contact Overcoat","authors":"E. LaBudde, C. Shevlin, R. LaBudde, Charles Carlino","doi":"10.1364/ods.1983.tua4","DOIUrl":"https://doi.org/10.1364/ods.1983.tua4","url":null,"abstract":"The development of an optical disk media suitable for applications in the computer industry requires the development of very high performance optical media and disk drive systems. Of major importance is the development of a media with sufficient sensitivity to be used with commercially available low cost and reliable lasers along with long life and reliability of data recoveries after extended periods of storage times. The overall performance of an optical disk is principally determined by the basic overall design as well as the selection of materials and processes used to manufacture the disk. Of particular importance is the need to develop a disk that has a highly stable operating performance in a wide range of environments, in particular the necessity to protect the recording layer from dust and other contaminations is critical in the error rate performance. This paper describes an overall disk design which promises to meet the stringent performance requirements for a computer compatible optical disk system. In addition, a relatively simple overall thermal and optical model will be developed to describe the behavior of the physical principles involved in the optical recording processes. This paper additionally will provide collaborating test and experimental evidence to confirm the validity of the analytical models. The significance of this paper involves the reporting of a full-up disk design, analytical models, and experimental evidence to confirm that a new disk design has been successfully achieved which promises to meet a high performance application.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130409500","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":null,"pages":null},"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}
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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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}
It is shown that focus error signal spectrum, measured while disk is spinning, represents Fourier transform of the disk profile modified by the loop gain.
结果表明，圆盘旋转时测得的聚焦误差信号谱表示经环路增益修正后的圆盘轮廓的傅里叶变换。
{"title":"Dynamic Testing of Optical Disk Flatness","authors":"J. Lewkowicz, D. Cohen","doi":"10.1364/ods.1983.wb7","DOIUrl":"https://doi.org/10.1364/ods.1983.wb7","url":null,"abstract":"It is shown that focus error signal spectrum, measured while disk is spinning, represents Fourier transform of the disk profile modified by the loop gain.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121189239","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 CD-ROM ( Compact Disc Read Only Memory), based on the digital audio Compact Disc system[1], is designed as a data storage device for computers. With a 540M-byte capacity, and a high-speed, random-access capability, the CD-ROM offers a wide range of storage applications and greatly expands the potential uses of computers.
CD-ROM (Compact Disc Read Only Memory，光盘只读存储器)是基于数字音频光盘系统[1]而设计的一种计算机数据存储设备。凭借540万字节的容量和高速随机存取能力，CD-ROM提供了广泛的存储应用，并极大地扩展了计算机的潜在用途。
{"title":"CD-ROM System","authors":"Yoichiro Sako, Tadao Suzuki","doi":"10.1364/ods.1985.wcc1","DOIUrl":"https://doi.org/10.1364/ods.1985.wcc1","url":null,"abstract":"The CD-ROM ( Compact Disc Read Only Memory), based on the digital audio Compact Disc system[1], is designed as a data storage device for computers. With a 540M-byte capacity, and a high-speed, random-access capability, the CD-ROM offers a wide range of storage applications and greatly expands the potential uses of computers.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116936989","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. Toda, K. Shigematsu, M. Yoshihiro, M. Ojima, Y. Tsunoda
Magneto-optical (M-0) disk is an erasable and large capacity memory which has been actively developed by many companies in the world. One of the most serious problem in developing M-0 disk is to guarantee the signal to noise (SN) ratio . In the M-0 disk, Kerr effect is utilized to reproduce the recorded data on the disk. However, Kerr effect is usually so small that the SN ratio is considerably small comparing with that of the write-once optical disk. Moreover, the SN ratio decreases in association with the retardation of disk substrate because of the degradation of the polarization state of the laser beam. Consequently, a precise analysis of the SN ratio taking retardation of disk substrate into account is significantly important for designing M-0 disk system. In this paper, retardation of the policarbonate substrate is precisely investigated and quantitative relations between the SN ratio and the retardation of disk substrate are particularly studied by the polarization simulator which traces polarization state of the laser beam.
{"title":"Analysis of Signal to Noise Ratio in Magneto-Optical Disk Using a Polarization Simulator","authors":"T. Toda, K. Shigematsu, M. Yoshihiro, M. Ojima, Y. Tsunoda","doi":"10.1364/ods.1987.wb4","DOIUrl":"https://doi.org/10.1364/ods.1987.wb4","url":null,"abstract":"Magneto-optical (M-0) disk is an erasable and large capacity memory which has been actively developed by many companies in the world. One of the most serious problem in developing M-0 disk is to guarantee the signal to noise (SN) ratio . In the M-0 disk, Kerr effect is utilized to reproduce the recorded data on the disk. However, Kerr effect is usually so small that the SN ratio is considerably small comparing with that of the write-once optical disk. Moreover, the SN ratio decreases in association with the retardation of disk substrate because of the degradation of the polarization state of the laser beam. Consequently, a precise analysis of the SN ratio taking retardation of disk substrate into account is significantly important for designing M-0 disk system. In this paper, retardation of the policarbonate substrate is precisely investigated and quantitative relations between the SN ratio and the retardation of disk substrate are particularly studied by the polarization simulator which traces polarization state of the laser beam.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115706367","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 measurement of write/read characteristics of the media is a common requirement of all media manufacturers. This paper describes the methods used at Eastman Kodak Company in the characterization of the 14" write once media.
{"title":"Practical Specifications for Characterizing Write/Read Performance of Optical Disk Media","authors":"G. R. Lange","doi":"10.1364/ods.1987.wc4","DOIUrl":"https://doi.org/10.1364/ods.1987.wc4","url":null,"abstract":"The measurement of write/read characteristics of the media is a common requirement of all media manufacturers. This paper describes the methods used at Eastman Kodak Company in the characterization of the 14\" write once media.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114654593","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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