Resources Contact Us Home
Method and apparatus for an optical laser keypad

Image Number 3 for United States Patent #6525677.

An optical laser numeric keypad (100) provides a digital signal indicative of which of a plurality of key locations is selected. The optical laser numeric keypad (100) comprises a plurality of optical sensors (132 and 134) each configured to respond to a change in a received light quantity and to provide an electrical signal in response to a selection of a key at a key location. The received light quantity of at least one of the plurality of optical sensors (132 and 134) is changeable by selection of a key location.

  Recently Added Patents
Grounding fitting
Liquid-level sensor
Round carrying case
Cathode active material and lithium secondary battery comprising the same
Method and apparatus for controlling power supply
Uplink interference mitigation method and apparatus
Electromagnetic sensor cable and electrical configuration therefor
  Randomly Featured Patents
Composition for desmutting aluminum
Structural bridging fastener
Water fountain light
Automated survey kiosk
Remote monitoring system
Air-fuel ratio feedback control
Foldable adapter for a water closet for use by a pet animal
Outboard jet propulsion device
Low cost electronic probe devices manufactured from conductive loaded resin-based materials