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Magnetic
clamper recommendations |
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A magnetic clamper has to be used in order to
keep the disc in position. Such a clamper has
been especially designed for the CD-Pro2LF module and we advise to use it in
order to get the best performances out of your
application (playability, disc
acceptance,…).
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However,
the clamper is a visible part in your
application and you may want to design it
yourself, so that it matches the line of your
products. In this case, the following
recommendations have to be taken into account
(for instance, a too strong clamping force would
brake the spinning motor and have serious
consequences on the playability and the disc
acceptance of the application) :
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The
minimum clamping force is 135 gram force. Below
135 grf, the radial noise increases. Below 85
grf, the radial noise reaches unacceptable
level. Besides, an extra thick disc will
decrease the clamping force.
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The maximum clamping
force is 200 gram force
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The
original magnet is equipped with a metal ring to
act as a shortcut for magnetic stray fields. In
this way, the magnetic stray fields do not reach
the opto-magnetic control system. This should
also be taken into account when designing a new
clamper.
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The
inertia of the system should not be increased by
means of a heavy disc clamp puck. Best is to
keep the puck weight below 150 grams.
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The shape of the
clamper should have a low inertia profile.
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The actual clamping
area is the edge of the turn-table. The clamper
should only clamp in the area close to the edge
of the disc (some discs may be wrongly shaped).
Please refer to the mechanical diagram of the
turn table.
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If
you design a clamper which does not fulfill
the above recommendations, performances of the
application may be seriously affected : it would
be consequently better to use the original clamp
device.
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