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. |
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 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, and in special shapes including "Ball-Shaped" Fine Gobs |
| 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 |
| 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 Radiuses in 4mm diameter range
Small Diameter Fine Gob (FG)
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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 environment 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.
Please also inform specification and available shape of us. |
| 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 |
| Diameter(mm) |
3.5-3.7 |
4.1-4.4 |
4.6-5.0 |
5.1-5.5 |
| Thickness(mm) |
3.1-3.4 |
3.5-3.9 |
3.6-4.4 |
3.8-4.7 |
| R1(mm) |
1.6-1.9 |
2.1-2.4 |
2.3-2.7 |
2.4-3.0 |
| R2(mm) |
1.7-2.4 |
2.3-2.8 |
2.4-5.0 |
2.6-5.0 |
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 |
*As the range of dimensions and shapes can change depending on the glass type, please contact us with your specific requirements.
Introducution of Glass Properties CONTENTS
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