FPXvision

FPXvisionTM is the newest generation of Finetechs Vision Alignment Systems (VAS). Going beyond an ordinary evolution, this impressive range of technological innovations opens up new fields of application to the user. With FPXvisionTM Finetech takes FINEPLACER® optics to the next level.

Specially developed optics ensure that the full resolution potential of the FPXvisionTM HD camera chips can be utilized. The IPMCommand operating software and pattern recognition provides optimal visual information!

  • FPXvision - the new Vision Alignment System

Highlights*

  • Large field of view in highest resolution and the freedom of a long working distance
  • Perfect visualization of smallest structures without distortion (WYSIWYG)
  • Improved pattern recognition for best reproducibility with manual and automated alignment
  • Multiple screen magnifiers to show details and overview at the same time
  • Thermal stabilization for highest placement accuracy  at all bonding technologies
  • Uniform illumination in up to three wave lengths for optimal reflectivity at various surface structures and materials

Technical Background

Optics

  • Blue light has the shortest wavelength, allowing a better resolution.

The resolution potential of a camera depends on the camera's chip and the optics (lens). The combined performance is constrained by the weaker of the two. Consequently, today’s high-resolution camera chips with dozens of Megapixels have no added value if the optics are not designed to match capabilities.

With the new FPXvisionTM, Finetech offers a perfectly harmonized optical system with a 10.1 MP camera chip and optics providing a resolution of 400lp/mm which was specifically developed for this type of chip. Using adapted lenses in a defined assembly allows for a high-resolution optical system with a 3.8 x 2.7 mm² field of view and a resolution of 1 µm/px.

Additionally, integrated LED provides coaxial and diffuse illumination of the object in up to three different wavelengths. This allows for optimal appearance of fiducials and structures no matter the material of component or substrate.

FPXvisionTM combines two such optical systems to generate a real-time overlay image of chip and substrate.

What does subpixeling actually mean?

The magnification factor of a lens defines the size of an object represented on the camera's image sensor. For FPXvisionTM the native resolution is 1 pixel per micron, which raises the question: How can you align with sub-micron accuracy? – The answer is: by using sub-pixeling!

In addition to its size, each pixel provides information on its brightness (gray scale). (Fig. 1)

Even for small objects, several adjacent pixels participate in the representation of a structure. (Fig.2)

Each pixel has a certain gray scale value, contributing to the representation. (Fig.3)

So even if the exact visual information on a structure gets lost due to low resolution, the information on the position will stay intact. (Fig. 4). This is true for both the human eye as well as for the picture processing of the pattern recognition. In this example, a 6x sub-pixeling is applied, meaning 1/6 micron based on our original pixel.

If more pixels participate, more information on the position of the structure will be available. Regular or symmetric structures will prove helpful. (Fig. 5)

  • The gray scale value provides information on its level of brightness
  • Also the gray scale values of adjacent pixels contribute to a more exact representation of the structure
  • More pixels=more position information
  • In most cases, adjacent pixels participate in the visual representation of a structure
  • Despite loss of resolution, position information will mostly stay intact

Camera Features and Display Options

FPXvisionTM is an adaptive camera system capable of moving to various positions along the component. This extends the field of view up to 100 mm. Comprehensive calibration algorithms for image correction, which is applied to every single pixel, allow a very precise and realistic representation of structures, edges or markers.

A helpful set of assistant tools is available. This includes a picture-in-picture function and screen magnifiers. With picture-in-picture, it is possible to simultaneously show the entire field of view as well as specific magnified areas. Additionally, multiple screen magnifiers can be freely positioned across the field of view for a better view of structures, edges or markers relevant for the alignment process.

FPXvisionTM offers smart options in combination with the software assisted alignment correction/verification via pattern recognition. The result is a  streamlined alignment routine, providing optimal assistance to the operator and ensuring repeatable placement results.

  • Software-based image restitution
  • Freely defined screen magnifiers

*Technical data are standard values (other values on request). Specifications given are subject to change without notice and may not be used as a basis for a binding offer or quotation.