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ＨＳＤとはHolography System Developmentの略称です。
本フォーラムは、消費者やユーザの便宜を最優先としたHolography System(HS)の実現を目指すことを目的としています。HVD(Holographic Versatile Disc)は、HSの一例であり、本フォーラムはHVDに限らず活動の対象としております。
以下にHSの一例であるHVDの技術情報を示します。
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Collinear™ Technology Unlocks the Promise of Holographic Storage by Solving 40 Year Old Problems |
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To-date, conventional wisdom has held that holographic recording required two beams to be projected on the recording medium at precise angles to record and read holographic images. Conventional two-axis holography has labored for 40 years under this approach meeting with limited success. Optware's management team, with years of optical industry experience at companies like the Sony Corporation, took a new approach to solve the problems inherent in conventional holography. Optware's patented Collinear™ Holography coaxially aligns the two beams, data beam and reference beam, and projects them onto the medium through a single lens. Like with CD/DVD's, Optware positioned all of the optics on one side of the disc. This unlocked the potential of holographic storage and provides the following benefits:
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Simple and small optics for small drive and cost reduction |
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Reflective type disc with pre-format address layer (dynamic focusing and tracking servo scheme) for disc interchangeability and higher system margin |
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More robust design for use in harsh environments |
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Unique, patented holographic encryption resulting from reference and data patterns |
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Holographic Versatile Disc – Disc Structure |
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The simple but revolutionary concept of HVD comes from inventor, Mr. Horimai's long time experience in optical disk development and his idea to combine Collinear™ technology with the conventional optical disk technology.
The figure on the right shows the cross section of an HVD disc. As seen in this diagram, holographic recording layer is formed on top of a reflective layer. The simple optical setup of Collinear™ Technology has allowed the HVD disc to have a reflective layer on the substrate and address pits formed on this layer. This configuration is the key to apply Collinear™ Technology to commercial HVD products.
These address pits and the servo technology to read them guarantee the interchangeability of HVD discs, ruggedness against vibration in the real environment, wide system margin against variety of HVD discs from different manufacturers. Of course the servo information also make random access easy.
Then, does HVD need special, sophisticated servo technology? The answer is "No." The servo technology and the address pits are, in fact, not different from those used in the current CD and DVD players and disks. The laser which is used to read address pits is 650nm red laser, also common with DVD players in the market.
Another layer called "Dichroic Mirror Layer・is placed between the holographic recording layer and the substrate to block the green or blue laser, which are used to read/write holographic information, to reach address pits, thus eliminates noise.
To make a long story short, HVD is a disc the holographic recording layer of which is formed on top of a conventional optical disk.
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About HVD and Standardization |
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Optware and its HVD FORUM Partners have successfully led the way to establishing worldwide industry standards for the interchange of Holographic Information Storage Systems. In December 2004 Geneva based Ecma International approved the establishment of Technical Committee TC44. The Scope of TC44 is to maintain an overall view and strategy for standardization in the field of holographic information storage systems, and to identify and develop Standards, Technical Reports and Guidelines in this field. To monitor and pursue standardization at a global level with regard to ISO/IEC JTC 1 and the international standardization community in general, including but not limited to the AV/IT and computer interfaces community. To develop guidelines for the archival life, testing, maintenance and handling of media recorded by holographic means, and to specify end-of-life monitoring techniques, mechanisms and devices. Over 25 people from numerous companies and Universities around the world have attended the meetings of TC44, including Software Architects Inc., InPhase, Pioneer, Panasonic, Ovalrock, Stanford University, Sony, Fujifilm, CMC Magnetics, Texas Instruments, Optware, Toagosei, Hitachi, Toshiba, Plasmon, Pulstec, Philips and IBM. Ecma International has developed 90% of all modern international standards for interchangeable optical and magnetic storage media. According to Ecma Secretary General Mr. Jan van den Beld, "The large capacity together with the high data transfer speed of holographically recorded media will create a quantum leap in media storage technology. Ecma International prides itself on beginning work on ground-breaking standardisation projects at a time which is well aligned with the anticipated availability of products to the commercial market. In this way, those companies who will become the early adopters of those products can work together in the open standards environment of Ecma to reach a broad consensus of support on the minimum set of technical parameters needed to insure true interchangeability of the recorded information. Ecma is very pleased to undertake the standardization of Holographic Versatile Discs, Holographic Versatile Cards and related subjects." TC44 is currently working only on Projects proposed by Optware and its HVD FORUM Partners which are based upon Collinear™ Technologies. |
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Roadmap |
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