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| Q1. |
Which division is in charge
of optical components for optical pickups? |
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| A1. |
Plastic Optics Division is in
charge of optical components for optical pickups. |
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| Q2. |
Do you have standardized
products of optical components for optical pickups? Do you
have any catalogs available? |
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| A2. |
Our products are basically custom-made
to suit each customer's own requirements. Our sales department
welcomes your inquiries. |
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| Q3. |
What component has particularly
large market share? |
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| A3. |
Holder integrated type of gratings
has the large market share. Recently, we provide a lot of
hybrid products such as "grating + relay lens".
Additionally, we can also supply a double-sided grating and
new type of gratings which can respond to super multi specifications & DPP
signal processing. For further information, please contact
our development department. |
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| Q4 |
I have a technical inquiry:
what kind of relations between a grating (including pitch)
and a simple pickup optical system are given? |
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| A4. |
Given the following simple model:
LD_Grating_Collimator lens_Objective lens
In this case, and the distance between main beam and sub-beam
on the disc is:
(Simple calculation)
S = L×θ×( Fo / Fc )
S: distance of main beam to
sub-beam on disc
L: distance from LD to Grating
θ: θ  sinθ tanθ / λ/d λ:
wavelength d: Pitch of Grating
Fc: focal length of Collimator Lens
Fo: focal length of Objective Lens
L=5mm, λ=0.78μm,
d=25μm, Fc=21mm, Fo=3.05mm
S = 5×0.78×3.05 / ( 25×21 ) = 0.0227mm = 22.7μm |
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| Q5. |
Do you supply plastic components
for Blue LDs? |
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| A5. |
Recently, material makers are
developing light-stable materials. Up to now, there is only
one material, "ZEONEX-340R" is on the market. We
estimate that it is possible to provide those components
with lower density of blue LD light. For further information,
please contact our development department. |
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| For more information about the Optical
Devices, please contact us. Our addresses and phone
numbers are available here. |
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