Resources Contact Us Home
Optical fingerprint imaging device

Image Number 3 for United States Patent #4925300.

Apparatus suitable for imaging fingerprints directly from a finger in contact with a transparent surface of a lens is described. The conical nature of the contact surface affords the opportunity for a single such surface to accommodate a wide range of finger sizes. The front surface of the lens is conical, and a light source is provided for illuminating the finger, with ridges of the fingerprint being imaged and light illuminating the papillary valleys being refracted away from the imaging means.

  Recently Added Patents
Implantable device
Curable inks comprising surfactant-coated magnetic nanoparticles
Subcarrier cluster-based power control in wireless communications
Method and apparatus for reducing power consumption used in communication system having time slots
Blocky hydroxyethylcellulose, derivatives thereof, process of making and uses thereof
Ventilated vacuum commutation structure
  Randomly Featured Patents
Water purification system with purified water cooling apparatus
Quick release device
Mortalin and methods for determining complementation group assignment of cancer cells
Leisure vehicle
Thin silicon based substrate
Method of preparing tobacco smoke filter
Disperse azo dyestuffs and process for preparation and their use
Method and apparatus for selecting an equalization algorithm depending on the used coding algorithm or on the channel quality
Dual polarized flat antenna device
Extrusion apparatus for making fire kindling device