SLD266ZS |
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■ 30 µm pitch 8-beam laser diode
■ 11.4 mm diameter, 10-pin
package
■ Even laser characteristics and low
crosstalk
■ High reliability
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 30 µm Pitch 8-Beam Laser Diode |
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There are two approaches to increasing
printing speeds in high-speed digital
copiers: the mechanical approach, in which
the rotational speed of the polygon mirror
is increased and/or the number of sides on
the mirror are increased, and the optical
approach, in which the number of beams in
the multiple laser beams that scan at the same
time is increased. To date, Sony has supported
the latter approach by providing a lineup
of laser diodes that provide two and four
beams per device. Now, as a key device for
achieving higher speed and higher resolution,
Sony has developed the SLD266ZS, which
doubles the number of beams from current
products to eight beams. Since the SLD266ZS
integrates eight laser stripes monolithically at
a 30 µm pitch, there are only extremely small discrepancies in the beam exit positions, and
it is easy to adjust the optical axis position of
the optical system.
The SLD266ZS is provided in a unique Sony
11.4 mm diameter, 10-pin package that was
designed for this product. |
| Even Laser Characteristics and
Low Crosstalk |
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To achieve high-quality printing, the laser
characteristics must be uniform between
beams and the thermal and electrical
interference between beams (crosstalk)
must be held to the absolute minimum. In
the SLD266ZS, Sony used its multibeam
technologies fostered up to now as the
basis and developed a new wafer process
to achieve even laser diode characteristics.
Furthermore, to achieve low inter-beam
thermal and electrical crosstalk, Sony adopted
their unique high-efficiency laser structure
which has a low threshold current value,
improved the device structure in the vicinity
of the light-emitting region, and succeeded
in significantly reducing the current loss. As
a result, the thermal generation in the laser
itself is held to a minimum thus achieving
low crosstalk. |
High Reliability
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Since digital copiers that use multibeam lasers
are high-end products, even higher reliability
is required as the number of beams increases.
In the SLD266ZS, from the very start of
development, we aimed to achieve high
reliability even at optical output power levels
one rank higher than the device rating as we
progressed with design and development.
As a result the SLD266ZS design includes
margins in both optical output and reliability.
Thus this device can also respond to needs for
higher output levels relatively easily. |
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•••• Mr. Yoshida••••
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In designing and developing this product
we aimed to achieve such high levels, in
both device characteristics and reliability,
that it would remain competitive even into
the next generation. While there were
some extremely difficult issues, such as
adopting a new and different process
technology, the commercialization team
worked together as a group and, with
the support of many other parties, has
already achieved volume production. I am
hopeful that Sony's 8-beam laser diodes
will prove useful to society for many
years. |
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See
all articles with figures and tables.  |
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Vol.60 |
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