The development of the magneto-optical disk memory has been pursued with extreme rapidity over the last few years. Since initially the CN ratio was low, it was felt that a long lead time would be required to bring the development to the stage of practical application. As will be described below, the characteristics have been constantly improved year after year so that the practical use of the magneto-optica1 disk memory is now only a question of time.
{"title":"Recent Trends of Magneto-optical Disk Memory","authors":"N. Imamura","doi":"10.1364/ods.1985.tubb1","DOIUrl":"https://doi.org/10.1364/ods.1985.tubb1","url":null,"abstract":"The development of the magneto-optical disk memory has been pursued with extreme rapidity over the last few years. Since initially the CN ratio was low, it was felt that a long lead time would be required to bring the development to the stage of practical application. As will be described below, the characteristics have been constantly improved year after year so that the practical use of the magneto-optica1 disk memory is now only a question of time.","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":"129147559","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 use of run-length-limited modulation codes to increase the storage capacity and data transfer rate of digital optical recorders is discussed.
讨论了利用限行调制码来提高数字光学记录器的存储容量和数据传输率。
{"title":"Digital Optical Recording - The Case for Coding","authors":"D. Howe, M. Meichle","doi":"10.1364/ods.1987.thb2","DOIUrl":"https://doi.org/10.1364/ods.1987.thb2","url":null,"abstract":"The use of run-length-limited modulation codes to increase the storage capacity and data transfer rate of digital optical recorders is discussed.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"2 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":"132308343","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}
S. Tokuhara, Y. Onisawa, Shuzo Iyoshi, Hirotaka Toba
Polymethylmethacrylate (PMMA) was usually used for the substrate for recently developed 20 cm ϕ or 30 cm ϕ optical memory disks because of the excellent optical properties, especially low level of birefringence. But warping by heat and water absorption during usage and storage is the drawback for PMMA substrate from the viewpoint of durability of disks. Polycarbonate (PC) on the other hand is not liable to warp but has generally poorer moldability and higher birefringence. This is the reason why PC could not be used for the disk substrate larger than compact disk size (12 cmϕ).
聚甲基丙烯酸甲酯(PMMA)由于其优异的光学性能，特别是低双折射水平，通常用于最近开发的20 cm φ或30 cm φ光学存储器的衬底。但从磁盘的耐用性角度来看，在使用和储存过程中由热量和水分吸收引起的翘曲是PMMA基板的缺点。另一方面，聚碳酸酯(PC)不易翘曲，但通常具有较差的可塑性和较高的双折射。这就是PC不能用于比光盘尺寸(12 cmφ)更大的磁盘基板的原因。
{"title":"Polycarbonate Substrate for Large Capacity Optical Memory Disk","authors":"S. Tokuhara, Y. Onisawa, Shuzo Iyoshi, Hirotaka Toba","doi":"10.1364/ods.1984.fca5","DOIUrl":"https://doi.org/10.1364/ods.1984.fca5","url":null,"abstract":"Polymethylmethacrylate (PMMA) was usually used for the substrate for recently developed 20 cm ϕ or 30 cm ϕ optical memory disks because of the excellent optical properties, especially low level of birefringence. But warping by heat and water absorption during usage and storage is the drawback for PMMA substrate from the viewpoint of durability of disks. Polycarbonate (PC) on the other hand is not liable to warp but has generally poorer moldability and higher birefringence. This is the reason why PC could not be used for the disk substrate larger than compact disk size (12 cmϕ).","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"7 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":"124850900","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}
Kenjiro Watanabe, T. Oyama, Y. Aoki, Noboru Sato, S. Miyaoka
Two new recording materials made of vapour-deposited films of Sb2Se3 and Sb2Te3 for video or digital signal recording are reported here. The recording on these films, which take place differently from recording on conventional ablative discs, is achieved by changing the optical characteristics of the film. The transmissivity and reflectivity of these films are greatly changed by irradiation or thermal treatment below 200°C. Since no holes are made on the disc, the size of the recording dot is easy to control, and the noise caused by the edge of the hole is eliminated. These new materials are found to be sensitive enough to permit the use of a diode laser in a DRAW (Direct Read After Write) system.
{"title":"New Optical Recording Material for DRAW Discs","authors":"Kenjiro Watanabe, T. Oyama, Y. Aoki, Noboru Sato, S. Miyaoka","doi":"10.1364/ods.1983.wa4","DOIUrl":"https://doi.org/10.1364/ods.1983.wa4","url":null,"abstract":"Two new recording materials made of vapour-deposited films of Sb2Se3 and Sb2Te3 for video or digital signal recording are reported here. The recording on these films, which take place differently from recording on conventional ablative discs, is achieved by changing the optical characteristics of the film. The transmissivity and reflectivity of these films are greatly changed by irradiation or thermal treatment below 200°C. Since no holes are made on the disc, the size of the recording dot is easy to control, and the noise caused by the edge of the hole is eliminated. These new materials are found to be sensitive enough to permit the use of a diode laser in a DRAW (Direct Read After Write) system.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"105 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":"125597503","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}
A high-performance, field-ready Optical Disk System(1), currently under development at RCA, is designed to meet or exceed the performance capabilities currently required for most remote data collection applications. The system, contained in a single-console unit (Figure 1), includes all disk drive optics and mechanisms, data processing electronics(2), and on-board micro-controller unit. Data is transferred at 20 Mbps continuously or at 40 Mbps in bursts and the user data capacity is 5 x 1010 bits per disk side with no more than 1 in 108 bits in error. Data is recorded (in two parallel channels) using a dual-element CDH-LOC diode laser array. Two-channel operation affords closer track juxtapositioning than is possible with single element devices thus increasing data capacity by as much as fifty percent. A single HeNe laser beam is split into multiple beams by cascaded transmission phase gratings for dual-track readout and radial tracking control. The optical footprint at the recording plane is illustrated in Figure 2.
{"title":"Disk Drive Optical System Operation Under Environmental Stress","authors":"J. S. Deutschbein, A. Earman","doi":"10.1364/ods.1984.wcb4","DOIUrl":"https://doi.org/10.1364/ods.1984.wcb4","url":null,"abstract":"A high-performance, field-ready Optical Disk System(1), currently under development at RCA, is designed to meet or exceed the performance capabilities currently required for most remote data collection applications. The system, contained in a single-console unit (Figure 1), includes all disk drive optics and mechanisms, data processing electronics(2), and on-board micro-controller unit. Data is transferred at 20 Mbps continuously or at 40 Mbps in bursts and the user data capacity is 5 x 1010 bits per disk side with no more than 1 in 108 bits in error. Data is recorded (in two parallel channels) using a dual-element CDH-LOC diode laser array. Two-channel operation affords closer track juxtapositioning than is possible with single element devices thus increasing data capacity by as much as fifty percent. A single HeNe laser beam is split into multiple beams by cascaded transmission phase gratings for dual-track readout and radial tracking control. The optical footprint at the recording plane is illustrated in Figure 2.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"42 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":"122795983","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}
S. Matsui, H. Takiguchi, M. Taneya, O. Yamamoto, H. Hayashi, S. Yamamoto, S. Yano, T. Hijikata
Low noise characteristics of semiconductor lasers are reguired for optical disk systems. In generally, single longitudinal mode lasers originate large mode competition noise as the gain envelope shifts with tempurature. Still more, feedback-induced noise of a single-mode laser occur, when a little portion of the laser output reflected by an external mirror is fed back into the laser cavity1). To improve this noise characteristics, it is important to stabilize the longitudinal mode in index guided laser2). This stabilization would be atained with gain suppression of nonlasing modes caused by nonlinear optical interactions with the lasing mode3)4).
{"title":"Low noise characteristics of VSIS lasers in single-longitudinal mode","authors":"S. Matsui, H. Takiguchi, M. Taneya, O. Yamamoto, H. Hayashi, S. Yamamoto, S. Yano, T. Hijikata","doi":"10.1364/ods.1984.fca2","DOIUrl":"https://doi.org/10.1364/ods.1984.fca2","url":null,"abstract":"Low noise characteristics of semiconductor lasers are reguired for optical disk systems. In generally, single longitudinal mode lasers originate large mode competition noise as the gain envelope shifts with tempurature. Still more, feedback-induced noise of a single-mode laser occur, when a little portion of the laser output reflected by an external mirror is fed back into the laser cavity1). To improve this noise characteristics, it is important to stabilize the longitudinal mode in index guided laser2). This stabilization would be atained with gain suppression of nonlasing modes caused by nonlinear optical interactions with the lasing mode3)4).","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","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":"115360128","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 performance of channel codes with different constraints such as fixed-disparity and d constraints has been measured using an optical recorder with software encoding and decoding.
用光学记录仪对固定视差和d约束条件下的信道码进行了性能测试。
{"title":"Measured Performance of Modulation Strategies for Digital Optical Recording Media","authors":"C. van Uijen","doi":"10.1364/ods.1987.thb1","DOIUrl":"https://doi.org/10.1364/ods.1987.thb1","url":null,"abstract":"The performance of channel codes with different constraints such as fixed-disparity and d constraints has been measured using an optical recorder with software encoding and decoding.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"42 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":"117202494","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}
Thus far CAV (Constant Angular Velocity) method or CLV (Constant Linear Velocity) method has been adopted as optical disk recording method.
到目前为止，光盘记录方法主要采用恒角速度法或恒线速度法。
{"title":"The New Application of MCAV Method to the Optical Disk Memory","authors":"A. Ishihara, Tomohisa Yoshimaru, Akino Chikamori","doi":"10.1364/ods.1987.fb2","DOIUrl":"https://doi.org/10.1364/ods.1987.fb2","url":null,"abstract":"Thus far CAV (Constant Angular Velocity) method or CLV (Constant Linear Velocity) method has been adopted as optical disk recording method.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"34 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":"128064321","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}
Y. Iso, H. Nakagaki, Masafumi Nakamura, Shigeki Inoue
The Digital Audio Disc and Player will be put on the market in '82 Autumn, for expectation consumer products. In 3 spots pick up System, which is composed of main-spot for reading recorded signal and focusing servo, and of 2 side-spots for getting track following signal, lens actuator noise appears in playback. For audio products, the noise is fatal defect. So, it is important, to decrease the noise. The detector sensitivity of track following signal level is deviated by the disc characteristics of reflection ratio, modulation, and crosstalk etc. However, DAD Player needs the stable pick up servo system for any disc. We developed the Automatic Loop gain Control System which solved those problems.
{"title":"Automatic Loop gain Control System of DAD Player’s tracking servo","authors":"Y. Iso, H. Nakagaki, Masafumi Nakamura, Shigeki Inoue","doi":"10.1364/ods.1983.wb5","DOIUrl":"https://doi.org/10.1364/ods.1983.wb5","url":null,"abstract":"The Digital Audio Disc and Player will be put on the market in '82 Autumn, for expectation consumer products. In 3 spots pick up System, which is composed of main-spot for reading recorded signal and focusing servo, and of 2 side-spots for getting track following signal, lens actuator noise appears in playback. For audio products, the noise is fatal defect. So, it is important, to decrease the noise. The detector sensitivity of track following signal level is deviated by the disc characteristics of reflection ratio, modulation, and crosstalk etc. However, DAD Player needs the stable pick up servo system for any disc. We developed the Automatic Loop gain Control System which solved those problems.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"42 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":"126907360","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}
There are two types of recordable disk media : the one using an ablative film forming pits through a process of melting or ablation1−4), the other that displays critical changes in its reflectivity and transmission absorbing the diode laser light power5−6). The latter type has a feasibility to be improved as an erasable medium if it satisfies some conditions for an erasable disk medium.
{"title":"Erasable disk memory using Te-TeO2 thin film","authors":"T. Yamashita, M. Takenaga","doi":"10.1364/ods.1984.thcd1","DOIUrl":"https://doi.org/10.1364/ods.1984.thcd1","url":null,"abstract":"There are two types of recordable disk media : the one using an ablative film forming pits through a process of melting or ablation1−4), the other that displays critical changes in its reflectivity and transmission absorbing the diode laser light power5−6). The latter type has a feasibility to be improved as an erasable medium if it satisfies some conditions for an erasable disk medium.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"39 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":"126352888","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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