We read
the announcement last week that NEC successfully created this drive, now thanks
to PhysOrg we can take a look at it!
This compatible head technology was developed by using
three lasers, the blue, red and infrared laser diodes ("LD"), as the light
source, thus enabling optimal reading of each disc through the optical
head using a single objective lens.
- Correction of the difference in
substrate thickness and wavelength, which causes spherical aberration, was
corrected by changing the magnification of the objective lens. Control of
the numerical aperture of the objective lens corresponding to each disc
format is enabled by an aperture control element that features wavelength
selectivity, which realizes stable
reading. |
You can visit over at the PhysOrg site to get some more information on
this very interesting piece of hardware.
Source: PhysOrg
