Victor Company of Japan, Ltd. (JVC) developed a proprietary "Extended Deep Ultraviolet Mastering System" (provisional name) that manufactures read-only Blu-ray master discs known as BD-ROM for the same cost as DVD master discs. BD-ROM and Blu-ray discs store over 2 hours of high-definition video.
JVC's new system records this master optical disc. It shines a laser beam corresponding to the formatted content signal on a spinning glass disc coated with photoresist made of photosensitive polymer resin. This optically activates the photoresist to create a small pit or depression that stores the signal.
In the DVD mass replication process, the glass master is what stampers are in turn made from. The final stamped disc is what is standard in any retail DVD software or music product.
Until now, manufacturing high-capacity BD-ROM glass masters required an expensive electron beam system with a beam finer than a laser beam, as well as special optics and photoresist material created in a vacuum. The manufacturing cost of BD-ROM master discs was therefore significantly higher than DVD master discs.
JVC's newly developed Extended Deep Ultraviolet Mastering System uses a deep ultraviolet laser beam to manufacture BD-ROM masters with just a small modification to a conventional DVD master recording system which uses blue violet to ultraviolet rays. For this reason it produces BD-ROM master discs for the same cost as DVD master discs. # # # JVC anticipates the spread of BD-ROM mass production systems using this system. <Extended DUV Mastering System> | (1) | The system is based on a conventional DVD master recording system, but uses a deep ultraviolet laser with a shorter wavelength than lasers used for DVDs. JVC improved the precision of the moving unit that holds the laser beam housing to enable highly accurate signal recording on the optical disc master. |
| (2) | The system is based on a conventional DVD master recording system, but uses a deep ultraviolet laser with a shorter wavelength than lasers used for DVDs. JVC improved the precision of the moving unit that holds the laser beam housing to enable highly accurate signal recording on the optical disc master. |
| (3) | The system is based on a conventional DVD master recording system, but uses a deep ultraviolet laser with a shorter wavelength than lasers used for DVDs. JVC improved the precision of the moving unit that holds the laser beam housing to enable highly accurate signal recording on the optical disc master. |
| (4) | The system is based on a conventional DVD master recording system, but uses a deep ultraviolet laser with a shorter wavelength than lasers used for DVDs. JVC improved the precision of the moving unit that holds the laser beam housing to enable highly accurate signal recording on the optical disc master. |
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<Schematic Diagram of Extended DUV Mastering System>
<About Read-only Blu-ray Discs>
The Blu-ray Disc Founders (BDF), made up of 13 leading Consumer electronic, PC and Media manufacturers, are currently finalizing the read-only Blu-ray discs tandard, as well as developing and promoting Blu-ray discs.
The BDF was created in May 2002. The 13 companies comprising the BDF are Dell Computer, Hewlett-Packard, Hitachi, LG Electronics, Matsushita Electric Industrial, Mitsubishi Electric, Pioneer, Philips, Samsung Electronics, Sharp, Sony, TDK, and Thomson Multimedia.
<Light Wavelength used for Optical Discs>
<Effect of Direct Focus Servo Unit>
| Without Direct Focus | | With Direct Focus |
|  | Comparison of focus error signal
Height variation for disc master was reduced to less than 1/10 previous values. |
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<Newly Developed High-Resolution Photoresist>
| Conventional photoresist | Newly developed photoresist |
|  | | The new photoresist for use with Blu-ray discs improves pit edge roughness, leading to significant noise reduction. The electron microscope images show pits created with a conventional photoresist (left) and the newly developed photoresist (right). |
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