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
Catalysts and process for producing aldehydes
Method and system for associating a cell-sector with time-dependent location parameters
Method for producing semiconductor substrate, semiconductor substrate, method for manufacturing electronic device, and reaction apparatus
Method and apparatus for optimizing paging in a communication network
Method of processing data and display apparatus for performing the method
Magnetic circuit and speaker using same
Error correct coding device, error correct coding method, and error correct coding program
  Randomly Featured Patents
Communication packet processor with a look-up engine and content-addressable memory for updating context information for a core processor
External storage subsystem
Buffer of semiconductor memory apparatus
Closely coupled, dual turbine volumetric flow meter
Picture frame and easel
Swimming pool drain
Camera storage case
Golf club sleeve and golf clubs for use therewith
Electronic thermometer
Method for fabricating dishing free shallow isolation trenches