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May 17, 2004
Development of Blu-ray Disc, DVD and CD compatible, 3 wavelength recording/playback Optical Head
Sony Corporation has developed a single 3-wavelength recording/playback optical head, capable of recording and playing-back 3 formats, Blu-ray Disc (BD), in addition to DVD, CD, which is a high-density optical disc system capable of recording/playing back high definition contents.
BD is an optical disc system capable of recording and playing-back HD contents from, for example, HD broadcasting. Sony has commercialized the world's first BD recorder <BDZ-S77> with this standard. The BD market is expected to expand in the coming era where high-quality contents will become the mainstream and BD recognized as the indispensable optical disc system. On the other hand, together with the capability to recording/playing-back HD contents of the BD standards, it is desired for the BD recorder to play DVD software, recorded rewriteable/postscript DVD disc, as well as playback of music CD. In order to cope with this, in <BDZ-S77> , 2 optical heads, one to playback DVD and CD, and the other to record and playback BD is incorporated.
In the newly developed 3-wavelength recording and playback optical head, the main characteristics are its capability to record/playback the 3 formats, BD, DVD and CD with one single optical head.This is achieved by the introduction of the newly developed single unit 3 wavelength laser, and also an object lens corresponding to the 3 wavelengths.
<<Playback output signal wave pattern of the newly developed Optical Head ('Eye pattern')>>
Favorable output patterns were obtained by all wavelengths, BD, DVD and CD.
* In the 'Eye pattern', when the signal output from the disc is read by an oscilloscope, the more favorable the output characteristics are, the clearer and better the wave-shape is.
<<Newly developed 3 wavelength laser (hybrid-type)>>
Sony will target commercializing the newly developed 3-wavelength optical head within 2 years, and will positively promote to further technology development. By doing so, in addition to further reducing the number of parts used for achieving smaller size of optical heads, enhancement of productivity and reliability will be achieved. This will contribute to the BD market expansion by realizing BD related key devices to be utilized in various AV and IT products.