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Precision laboratory apparatus for high temperature compression molding of glass lenses
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View: Figures


Image of FIG. 1.
FIG. 1.

Illustration of molding process for an aspherical glass optic.

Image of FIG. 2.
FIG. 2.

Schematic of the glass molding apparatus. (1) PC with DAQ hardware, (2) thermal PID controller, (3) tube furnace, (4) load measuring assembly, and (5) linear actuator assembly.

Image of FIG. 3.
FIG. 3.

Load cell assembly.

Image of FIG. 4.
FIG. 4.

Axial motion control block diagram.

Image of FIG. 5.
FIG. 5.

Experimental stress vs strain curves of cylinder compression tests at different temperatures for BK7 glass.

Image of FIG. 6.
FIG. 6.

Measured viscosity values obtained from the compression test performed on the high temperature glass molding apparatus for (a) BK7 glass and (b) SK5 glass.

Image of FIG. 7.
FIG. 7.

Mold position and load vs time for the determination of relaxation modulus for BK7 glass at 663 °C utilizing a closed loop positional feedback control.

Image of FIG. 8.
FIG. 8.

Microlens molding schematic.

Image of FIG. 9.
FIG. 9.

A SEM picture of molded microlens array.

Image of FIG. 10.
FIG. 10.

CMM measurement of micro lenses.


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Scitation: Precision laboratory apparatus for high temperature compression molding of glass lenses