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Low Tg Optical Glass for Glass
Mold Lens
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| Polished Ball
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This product services a broad range
of uses from telecommunications to imaging. We respond to our
customer's demands for Polished Balls with low cost, excellent
quality and high volume production. The outer diameters can range
from less than 1mm to greater than 10mm, and can be used for various
applications. Our typical diameter tolerance is +/-5μm. Read More... |
| Fine Gob
(FG) |
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Fine Gobs are made of low
Transformation Temperature (Tg) glasses and are used as
pre-forms for precision lens molding. These products are very
efficient and environmentally friendly. Also, the molding process
lends itself to very few surface defects, such as cracks which are
created using conventional polishing
processes.
The
typical shape is "Convex-Oval" per the drawing below. The basic
dimensions of the gobs for various volumes are listed in the chart.
Please let us know your preferred outer diameter, thickness and
radius when you place the order with us.Please
contact us if you are interested in Fine Gobs with 0.1cc or less and
0.7cc or more, or in special shapes including "Ball-Shaped" Fine
Gobs. Read More... |
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Volume (ml) |
0.1 |
0.2 |
0.3 |
0.5 |
0.7 |
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Diameter (mm) |
6.0-6.5 |
7.5-8.5 |
9.0-10.0 |
11.0-12.5 |
12.0-14.5 |
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Thickness (mm) |
4.5-5.0 |
5.5-6.5 |
6.0-7.0 |
7.0-8.0 |
7.5-8.5 |
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R1(mm) |
3.0-4.5 |
4.5-5.5 |
6.0-7.5 |
8.5-11.0 |
12.0-17.5 |
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R2(mm) |
3.0-4.5 |
4.5-7.0 |
5.0-8.5 |
6.0-10.0 |
6.5-12.0 |
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| R1& R2 mean radii in
4mm diameter range |
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Small
Diameter Fine Gob (FG) (Trial
Products)
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These Small Diameter Fine Gobs will
satisfy requirements for smaller diameter molded optics which cannot
be manufactured using our standard size Fine Gobs. Improvement in
the volume accuracy of these Small Diameter Fine Gobs makes them
ideal for use in centerless equipment. The use of low Tg glasses for
lens molding eliminates the environmental concerns of conventional
polishing, is very cost efficient, and leads to smooth, scratch free
surfaces. This form of supply is suitable for small diameter glass
molded lenses for applications such as a cellular-phone cameras and
DVD pickup lenses.
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Calculated Diameter As Spherical Shape
(mm) |
3.5 |
4.0 |
4.5 |
5.0 |
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Volume (ml) |
0.022 |
0.034 |
0.048 |
0.065 |
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Diameter (mm) |
3.5-3.7 |
4.1-4.4 |
4.6-5.0 |
5.1-5.5 |
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Thickness
(mm) |
3.1-3.4 |
3.5-3.9 |
3.6-4.4 |
3.8-4.7 |
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R1
(mm) |
1.6-1.9 |
2.1-2.4 |
2.3-2.7 |
2.4-3.0 |
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R2
(mm) |
1.7-2.4 |
2.3-2.8 |
2.4-5.0 |
2.6-5.0 |
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Reheat Pressing and Saw Cut
Centerless Ground Cylindrical Blanks
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These forms of supply can be used to provide
blanks, including radii, that are near net shape to the finished
lens dimensions. These blanks can incorporate a convex radius and
are suitable for large diameter lens blanks that may be beyond the
diameter size range of our Polished Balls or Fine Gobs. Pressed
Blanks and Saw Cut Centerless Ground Cylindrical Blanks can be
produced in various sizes and shapes and we will maintain the same
quality control and specifications shown in our optical glass
catalog. |
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Diameter
(mm) |
Diameter Tolerance
(mm) |
Thickness
Tolerance
(mm) |
| Pressing |
Φ8.0~Φ100.0 |
±0.1~±0.6 |
±0.3~±0.7 |
| Cylindrical Blanks |
Φ2.5~Φ20 |
±0.02 |
±0.2 |
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*As the range
of dimensions and shapes can change depending on the glass type,
please contact us with your specific
requirements.
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