SLD3234VF
SLD3234VFI |
| . |
. |
|
* Maximum optical power
output: 170 mW (in pulse
drive mode)
* Package size reduced to a
3.8 mm diameter for use in
slim drives
* Excellent high-temperature
characteristics |
|
 |
| |
|
 Maximum Optical Power Output:
170 mW (in pulse drive mode) |
|
Sony has already released the
SLD3233VF (pulse drive mode maximum
optical power output: 125 mW) blue-violet
laser diode that supports two-layer 2×
speed recording. However, even higher
power levels are now required in blue-violet
laser diodes to make higher recording
densities and speeds possible. When aiming
for higher output levels, what becomes
an issue is catastrophic optical damage
(COD) at the laser element end surface.
In the newly-developed SLD3234VF and
SLD3234VFI of this release, Sony optimized
the end surface film process and the
end surface reflectivity. Also, by improving
the electrode structure, Sony reduced
heat generation in the vicinity of the optical
generation area during high-power
operation and minimized reductions in
reliability due to COD. As a result, Sony
was able to create blue-violet laser diodes
that are capable of a maximum optical
power output of 170 mW in pulse drive
mode. |
| New 3.8 mm Diameter
Miniature Package Supports
Slim Drives |
|
It is expected that there will be increasing
demand for slim form factors in Blu-ray
Disc drives. To respond to these market
demands, Sony developed two products:
the SLD3234VF, which is provided in a
standard 5.6 mm diameter package, and
the SLD3234VFI, which is provided in a
3.8 mm diameter package that supports
slim drives. The SLD3234VFI achieves a
miniaturization to less that one half the
volume of the earlier 5.6 mm diameter
products. Sony adopted a new package
material and took full advantage of high-precision
assembly technologies to prevent
the degradation of laser characteristics
and reliability caused by heat generation
during high-power operation that is
of concern due to package miniaturization.
As a result, Sony achieved laser characteristics
and reliability equivalent to the
product in the existing package. |
| Excellent High-Temperature
Characteristics |
|
During recording, the heat generated by
both the structural components and the
laser diode itself becomes significant.
Also, since hardware internal temperatures
in IT applications can rise significantly,
high reliability in high temperature environments
is necessary in laser diodes. In
the SLD3234VF and SLD3234VFI of this
release, Sony introduced new structures in
the areas surrounding the optical generation
region to suppress temperature dependant
changes in drive current. As a result,
these device achieve stable operation even
under environments with temperatures as
high as 75ºC. |
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|
•••• Mr. MIZUNO ••••
|
|
|
Interest in Blu-ray Discs is increasing
rapidly due to the release of
the PS3*1 and the increasing
popularity of terrestrial digital
broadcasting. The necessity of
blue-violet laser diodes that can
support even higher recording
densities and speeds is becoming
stronger day by day in proportion
to this increasing interest. Although
we had to clear many technological
hurdles in moving to this
higher power, our staff is working
together to push forward our development
efforts to respond to
these and future market demands.
*1 PS3 is a trademark of Sony Computer
Entertainment Inc. |
|
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See
all articles with figures and tables.  |
|
Vol.49 |
|
