Resources Contact Us Home
Test head for optically inspecting workpieces comprising a lens for elongating a laser spot on the workpieces

Image Number 15 for United States Patent #7292329.

An optical test head comprises a laser source for providing a laser beam. The laser beam passes through a cylindrical lens for modifying the shape of the beam and a spherical lens for concentrating the beam onto a workpiece (typically a magnetic disk platter). The cylindrical lens both a) elongates the laser beam along the radial direction of the platter (by reducing the effective numerical aperture in the radial direction); and b) causes the beam to be out of focus in the radial direction (although the beam is typically in focus in the circumferential direction). The size of the beam in the radial direction is substantially insensitive to the position of the cylindrical lens.

  Recently Added Patents
Information recording medium and information processing method for accessing content with license or copyright protection
Dynamic learning method and adaptive normal behavior profile (NBP) architecture for providing fast protection of enterprise applications
System and method for logical separation of a server by using client virtualization
Automated security analysis for federated relationship
Satellite mounting poles
Method and system for shared high speed cache in SAS switches
Protecting information written to recording medium
  Randomly Featured Patents
Ultimate vent
Postage and mailing information applying system
Optical switching system and control method for micro mirror
Manufacturing process of porous resin mold containing continuous holes and casting mold
Hydraulic turbine for enhancing the level of dissolved gas in water
Apparatus for molding fixed-dimensional spherical bodies from a semisolid stick
One-piece leak-proof battery
Direct transfer sorting system
Crossbar support for vehicle roof rack