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
Interface circuit and interface system
Method for producing (meth)acrylic anhydride, method for storing (meth)acrylic anhydride, and method for producing (meth)acrylate
Three-dimensional shape data processing apparatus and three-dimensional shape data processing method
DL control channel structure enhancement
N-phenyl-(homo)piperazinyl-benzenesulfonyl or benzenesulfonamide compounds suitable for treating disorders that respond to the modulation of the serotonin 5-HT.sub.6 receptor
Resuming piecewise calibration of a real-time-clock unit after a measured offset that begins at the next calibration period
Fast and compact circuit for bus inversion
  Randomly Featured Patents
Self-cleaning device for detachably connecting electrical conductor wires
Chip card with dual communication interface
Check valve
Drive system for an agricultural or industrial utility vehicle and method for operating a drive system
HCEC blown rigid foams with low thermal conductivity
Fancy stitchery working frame support
Cobalt titanium oxide dielectric films
Writing instrument
Filler cradle for looseleaf ringbinders
Display arrangements