Photon welding devices for joining plastic parts
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United States of America Patent
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-
Jun 28, 2005
Grant Date -
May 22, 2003
app pub date -
Jan 4, 2002
filing date -
Jan 6, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Photon welding devices of this invention comprise a non-coherent photon source, and a light pipe coupled to the photon source at one end. A thin mask is positioned at another end of the light pipe that defines a weld location for photon delivery. A work piece to be bonded by the device comprises a top layer of transparent plastic and a base layer of absorbing plastic. The thin mask is in the form of a reflective coating positioned on the end of the light pipe over all surfaces that are not in contact with the work piece. A device includes a member that imposes a controlled, compressive force to the work piece while it is being welded and during a short time thereafter. The device also includes a member that maintains a desired alignment of the light pipe, top layer of the work piece, and base layer of the work piece during the bonding cycle.
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