Resources Contact Us Home
Motion sensor

Image Number 2 for United States Patent #5523742.

A motion detection device for use as a monitor for patient movement, inclng a sensor for generating motion signals, an integrator for integrating the motion signals over a period of time, and a threshold level of signals generating an alarm signal upon exceeding a predetermined minimum value of the motion signals to activate an alarm. The sensor includes an edge detector for providing a motion sensed outpost of a series of sharp voltage rises and falls to generate a sequence of voltage pulses of predetermined magnitude and time duration which generate an alarm signal if the pulses are generated faster than a preset rate of voltage decay based upon a preselected minimum movement to be sensed. The preferred intermittent switch comprises a conductive rolling sphere in a cylindrical chamber having a conductive wall with one electrical pole and end plates electrically insulated from the conductive wall and having the other electrical pole such that movement of the element caused by movement of the cylinder will generate intermittent electrical contact between one end plate and the cylinder wall. The device preferably further includes a transmitter producing a transmitted radio signal upon receipt of the alarm signal, the radio signal being receivable by a conventional radio.

  Recently Added Patents
Thermal conductivity and phase transition heat transfer mechanism including optical element to be cooled by heat transfer of the mechanism
Methods and apparatus for intelligent selection of goods and services in mobile commerce
Nanoparticle entrapment of materials
Nonvolatile semiconductor storage device and a manufacturing method thereof
Electronic device and recording medium
Implantable defibrillator systems and methods with mitigations for saturation avoidance and accommodation
Boring machine
  Randomly Featured Patents
Devices, methods, systems and software products for coordination of computer main microprocessor and second microprocessor coupled thereto
Multi-well plate cover and assembly adapted for mechanical manipulation
Method and apparatus for auto-exposure control in the presence of artificial illumination
One way animal gate
Surface emitting device, manufacturing method thereof and projection display device using the same
Method and apparatus for automated manufacture of unit filters
Connecting pin for belt fasteners and the like
Method of forming isolating region
Power transmission system in a tractor
Asymmetry correction for magneto-resistive heads