Contact and Non-Contact Measurements with the LuphoScan

Table of Contents

Lens Moulds for Small Optics: Contact
Unique Capability for Small Steep-sided Lens Moulds
Measure Steep-Sided Optics with Ease
Excellent Repeatability – Results You Can Trust!
Lens Moulds for Small Optics: Non-Contact
Fast, Full, Non-Contact 3D Characterization of Lens Moulds
Benefits of Using the LuphoScan Interlignment module
LuphoScan Platform

Lens Moulds for Small Optics: Contact

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

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)

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.

Standard profilometer

Standard profilometer

PGI Dimension with tilted traverse

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.

Product solutions

  • PGI Dimension
  • PGI Optics*
  • PGI Matrix*

Analysis solutions

  • TalyMap®
  • Aspherics Analysis Utility (AAU)
  • Tool tip radius and x-offset correction

* Lower slope

3D astigmatism

3D astigmatism

Lens Moulds for Small Optics: Non-Contact

LuphoScan

LuphoScan

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

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 Platform

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.

Product solutions

  • LuphoScan
  • CCI

Analysis solutions

  • TalyMap
  • Aspherics Analysis Utility (AAU)
  • Interlignment module

LuphoScan Interlignment measurement

LuphoScan Interlignment measurement

1.9 billion cell phones used worldwide

1.9 billion cell phones used worldwide

Taylor Hobson Limited.

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.

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