 |
 |
| . |
. |
|
|
Blue-Violet Laser Diode for Blu-ray Disc Playback
SLD3131VF
SLD3131VFI
The market for Blu-ray Disc players has been growing due to the increasing
popularity of flat panel digital high-definition television.
Sony has now developed the SLD3131VF and SLD3131VFI blue-violet
laser diodes for Blu-ray Disc playback. By adopting an approach that
satisfies both device characteristic and manufacturability criteria, Sony
plans for these laser diodes to become the standard Blu-ray Disc playback
laser diodes. Sony is releasing two products at the same time,
one in a 5.6 mm diameter package for typical applications and one in
a 3.8 mm diameter package for IT applications. |
|
|
 |
SLD3131VF
SLD3131VFI |
| . |
. |
|
* The standard model Blu-ray Disc playback
laser diodes
* High-temperature operation, low power,
and low noise
* Available in two package options |
|
|
| |
|
 Standard Model Blu-ray Disc
Playback Laser Diodes |
|
Sony has developed the SLD3131VF and
SLD3131VFI blue-violet laser diodes as
light sources for Blu-ray Disc playback.
Sony took both characteristics and mass
production issues into consideration during
development so that the SLD3131VF
and SLD3131VFI would become the long-term
standard models for Blu-ray Disc
playback laser diodes. These lasers have
a maximum rating of 20 mW and support
playback of 2-layer discs that have a capacity
of 50 GB. By optimizing the chip
size and laser structure, there were also
merits from a production standpoint. Sony
has achieved stable product supply
through laser diode mass production technologies
fostered in laser development for
the Sony Computer Entertainment Inc.
PS3*1.
*1 PS3 is a trademark of Sony Computer Entertainment
Inc. |
| High-Temperature Operation,
Low Power, and Low Noise |
|
Since blue-violet laser diodes operate at
short wavelengths that have higher energy
than those of laser diodes used for DVD/CD playback, there is a tendency for them
to generate larger amounts of heat internally.
Thus it is expected that the environmental
temperatures during Blu-ray
Disc playback will also be higher. By optimizing
the laser structures in these devices,
Sony achieved a drive current of 45
mA (typical) and a drive voltage of 4.5 V
(typical) during 20 mW operation under
environments with temperatures as high
as 75ºC. Also, since these devices hold the
threshold current value at room temperature
to a low 25 mA (typical), the natural
light emission components are suppressed
and excellent noise characteristics are acquired. |
| Available in Two Package
Options |
|
Two products, the SLD3131VF and
SLD3131VFI, with differing packages
were developed at the same time. The
SLD3131VF adopts the 5.6 mm diameter
package that is used as the standard for
CD/DVD laser diodes and is expected to
be used in AV players and H/H drives. In
contrast, the SLD3131VFI adopts a 3.8
mm diameter package, and is proposed for
use in slim drives that require thin form
factor designs. Although increases in laser
diode temperature due to this miniaturization
are of concern with the 3.8 mm
diameter package, by optimizing the package
design and package materials, Sony
assured that this package provides equivalent
performance, including temperature
characteristics, to the 5.6 mm diameter
package. |
|
|
| |
|
|
|
•••• Mr. AGATSUMA••••
|
|
|
Although this was the first time I
have been in charge of design of
a Blu-ray Disc laser diode, I was
supported by my extensive experience
in GaN laser diode research
and development and by Sony’s
mass production technologies
and was able to create this product.
This product should become
the standard model blue-violet laser
diode, which is the key device
in the high-definition television
age, and I hope to continue with
design and development efforts
that incorporate our customers’
desires. |
|
 |
See
all articles with figures and tables.  |
|
Vol.49 |
|
|
|
|
