Currently, Steep sided aspheric moulds for small optics are among the most demanding of ultra-high precision optics applications and pose a number of challenges in acquiring exact, repeatable form data.
Form Talysurf® PGI Dimension
Unique Capability for Small Steep-sided Lens Moulds
Results you can trust – unmatched repeatability
Excellent form error repeatability on a precision mold is illustrated in Table 1. Results are from the PGI Dimension system, perfect for small steep- sided, concave lens moulds.
Form error (Pt) results (0–180 deg)
UMICORE IR GLASS
The PGI Dimension has given us much improved capability to measure a very large range of optics from small steep spheres to large diameter diffractives and gull wing aspheres. The Dimension also has a very impressive accuracy and robust performance, giving us results we can trust and reliability we can count on day after day.
Yann Guimond, General Manager
Measure Steep-Sided Optics with Ease
The PGI Dimension prevents stylus flanking and eliminates the need for steep-sided measurements by tilting the traverse datum. Data distortion is prevented by this. Before measurement is taken, the sample is aligned using Taylor Hobson’s patented advanced center and level technique. The alignment is attained by taking 4 measurements in turn, indexing the spindle by 90 degrees each time.
PGI Dimension with tilted traverse
Excellent Repeatability – Results You Can Trust!
Highly stable measurement platforms are provided by all Taylor Hobson instruments. This is the base for true characterization of precision optics. It makes sure that the sample remains well aligned for measurement, delivering unprecedented repeatability and offering the perfect solution for research work and production process control.
For more information, customers can contact Taylor Hobson and request Application note A139: High precision measurement of steep-sided miniature aspheres.
- PGI Dimension
- PGI Optics*
- PGI Matrix*
- Aspherics Analysis Utility (AAU)
- Tool tip radius and x-offset correction
* Lower slope
Lens Moulds for Small Optics: Non-Contact
Taylor Hobson’s interferometric scanning metrology system (LuphoScan) can be used to make full 180° scan of the mold surface along with a scan of the rim and the mountings. This gives full, non-contact 3D characterization of lens moulds.
Fast, Full, Non-Contact 3D Characterization of Lens Moulds
An innovative approach...
The various form and alignment measurement capabilities of the LuphoScan system and Interlignment module are shown in the diagram.
Diagram (A) The LuphoScan carries out a non-contact 3D measurement of the optical surface.
Diagram (B) Examples of various datums to which the optical surface of the mold may be referred using the Interlignment module.
(B) 1. Mold rim set as a datum. The tilt of the optical surface to the rim can be subsequently determined, together with the height of the optical axis with regards to the rim.
(B) 2 & 3. The mounting of the mold is measured and set as datum. The tilt and decenter of the optical surface can be subsequently determined.
Interlignment module measurement principle
Benefits of Using the LuphoScan Interlignment module
- Determine the decenter, tilt and absolute position of the optical surface
- Enhance the optical surface of a lens mold and its position relative to the mould rim and mountings
- Enhance the mechanical and optical repeatability of injection moldings
- Ultra high precision and reproducibility
- Rapid non-contact 3D measurement of rim, mold surface and mountings
LuphoScan is an interferometric, scanning metrology system based on MWLI® technology (multi-wavelength interferometry), developed to perform fast, ultra precision non-contact 3D form measurement.
- Aspherics Analysis Utility (AAU)
- Interlignment module
LuphoScan Interlignment measurement
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This information has been sourced, reviewed and adapted from materials provided by Taylor Hobson Limited.
For more information on this source, please visit Taylor Hobson Limited.