FORMS OF SUPPLY8.1 Glass Blocks
Strip Glass is made by drawing glass out of a furnace. Strips are rectangular
in shape, have slightly rippled fire-polished surfaces (unworked), and are
flame cut to the required lengths. The corners are round. Strips are coarse
or fine annealed. This is the least expensive form of supply.
Thickness 15 ~ 40mm
Width and Length 50 ~ 200mm
The above are standard strip sizes but there are exceptions for certain glass
types.
Please contact our sales department with your specific requirements.
FORMS OF SUPPLY8.2 Reheat Pressings
Reheat pressings are the product molded in heat press to shapes suitable
for spherical polished lenses and prisms.
Please specify followings:
1 ) Diameter (including grinding stock)
2 ) Center Thickness (including grinding stock)
3 ) Radii of curvature
4 ) Glass quality (striae, bubble, etc.)
5 ) Chamfer
The standard diameter range and the dimensional tolerances of these blanks
are shown in Table 14.
Diameter |
Outer & Inner Diameter
Tolerance[Range] |
Cener Thickness
Tolerance[Range] |
D ≦φ18 (mm) |
0.2 (mm) |
1.0 (mm) |
φ18<D ≦φ30 |
0.3 |
0.8 |
φ30<D ≦φ50 |
0.4 |
0.6 |
φ50<D ≦φ70 |
0.6 |
0.6 |
φ70<D ≦φ100 |
0.6 |
0.8 |
φ100<D ≦φ150 |
0.8 |
0.8 |
φ150<D ≦φ200 |
1.0 |
1.0 |
φ200<D ≦φ250 |
1.2 |
1.4 |
Please contact our sales department with your specific requirements.
FORMS OF SUPPLY8.3 Saw Cut Centerless Ground Cylindrical Blanks
These blanks are cut from a precision ground rod formed on a centerless
grinding machine.
The standard diameter range and the dimensional tolerances of these blanks
are shown in Table 15.
Table 15
Product Size |
Diameter Tolerance |
Thickness Tolerance |
φ3~20mm |
0.03mm |
0.3mm |
Please contact our sales department with your specific requirements.
FORMS OF SUPPLY8.4 Dimensional Specified Blanks
Followings are handled as the Dimensional Specified Blanks.
- Circular blanks
- Rectangular blanks
- Prism shaped blanks
- Special shaped blanks
- Fine annealed strips having specified size request
FORMS OF SUPPLY8.5 High Homogeneity Glasses
Ohara utilizes our leading edge technology to provide high homogeneity
glasses in various glass types. The homogeneity of the products are confirmed
by interferometer after striae inspection.
FORMS OF SUPPLY8.6 Polished Balls
These lenses are polished into a spherical shape. Polished ball can be used
as a preform for glass mold lens. For the ball lens dimensions, specifications
and other details, please contact us.
FORMS OF SUPPLY8.7 Polished Preforms
Polished preforms are the product polished spherically in a suitable shape
to be processed into aspherical glass mold lenses.
For the dimensions, specifications and other details on the polished preforms,
please contact our sales department.
FORMS OF SUPPLY8.8 Polished Lenses
The lenses have been subjected to double side polishing, centering and
coating.
For the dimensions, specifications and other details on the polished lenses,
please contact our sales department.
FORMS OF SUPPLY8.9 Glass Mold Lenses
Glass mold lenses are the product fabricated by heating and softening
polished preforms and transferring it in an ultra-high accuracy aspheric
mold and then supplied after centering and coating.
For the dimensions, specifications and other details on the polished preforms,
please contact our sales department.