Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Method of controlling mechanical mechanisms of optical storage apparatus for peak power/current reduction, and related optical storage apparatus and machine-readable medium
System and method for controlling device location determination
Apparatus and method for phase synchronization in radio frequency transmitters
Signal transfer apparatus
Human embryonic stem cell methods and PODXL expression
Method and apparatus for token-based context caching
Specializing disambiguation of a natural language expression
  Randomly Featured Patents
Mechanically actuated barrier system
Delayed delivery of web pages via e-mail or push techniques from an overloaded or partially functional web server
Heat exchanger housing with fan operated door
System for applying metadata for object recognition and event representation
Spray gun body
Multi-switch throw linkage
Direct edge connection for multi-chip integrated circuits
Methods for detecting human platelet-derived growth factor receptor agonists and antagonists
Diffraction optical element
Portable tubular cooler for canned beverages