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Although injection-compression molding has long been
studied, this method has not been used because of the
unsatisfactory levels of its effects and the complex
structure of the metal mold. However, as the demand
for molding quality becomes stronger, the injectioncompression
molding method is being used in a growing
number of applications for optical elements such as
optical waveguide, disc and lens.
Injection-compression molding has the following
effects:
1) Increases dimensional accuracy of the optical lens
and prevents a concave lens from being welded.
2) Increases transferability of fine patterns on the optical
waveguide and disc.
In this report, we discuss the following phenomena
by using a PVT diagram to identify the behavior of resin
in the injection-compression molding of an optical
waveguide and lens.
1) Compression effect related to transfer of fine patterns
in molding an optical waveguide, rising dependence
of compression and existence of optimal compression
time
2) Relation between the shape of a lens and the compression
effect in lens molding |
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