Sony Develops Blu-ray Disc, DVD and CD compatible, 3 wavelength recording/playback Optical Head

May 17, 2004
Sony 3 wavelength 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 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 , 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.

In the single unit 3 wavelength laser, by combining production techniques of high-level output blue-violet laser diode and processing precise alignment of multiple laser units, single packaging is realized. In the object lens, introduction of aspherical glass and hologram lens to achieve spherical aberration correction, corresponding to each wavelength enables one series of optical system to deal with 3 wavelengths.

By precisely processing the semiconductor laser chip of each wavelength, BD (wavelength:405nm), DVD (660m,) and CD (785nm), in a single unit, 3 types of lasers are emitted from 1 package.

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.

Find more details at Sony Corp. web-site.

Explore further: Researchers discover low-grade nonwoven cotton picks up 50 times own weight of oil

add to favorites email to friend print save as pdf

Related Stories

Google searches hold key to future market crashes

2 hours ago

A team of researchers from Warwick Business School and Boston University have developed a method to automatically identify topics that people search for on Google before subsequent stock market falls.

Recommended for you

Iliad founder says T-Mobile offer is 'real'

4 hours ago

French telecom upstart Iliad's founder said Friday that the company's offer for US-based T-Mobile is "real" and that he is open to working with partners on a deal.

Law changed to allow 'unlocking' cellphones

4 hours ago

President Barack Obama signed a bill into law on Friday making it legal once again to unlock a cellphone without permission from a wireless provider, so long as the service contract has expired.

Social network challenges end in tragedy

4 hours ago

Online challenges daring people to set themselves ablaze or douse themselves in ice water are racking up casualties and fueling wonder regarding idiocy in the Internet age.

Microsoft sues Samsung alleging contract breach

4 hours ago

Microsoft on Friday sued Samsung in federal court claiming the South Korean giant had breached a contract over cross-license technology used in the fiercely competitive smartphone market.

States debate digital currency

5 hours ago

Now that consumers can use digital currencies like bitcoin to buy rugs from Overstock.com, pay for Peruvian pork sandwiches from a food truck in Washington, D.C., and even make donations to political action committees, states ...

User comments : 0