摘要:
A financial transaction card adapted for individual use in reading information stored externally to the card, having machine readable information contained thereon identifying the user and the issuing institution for transacting business at locations remote from the issuing institution, includes:a. a rigid substantially rectangular base comprising a substantially transparent material and having a top surface and a bottom surface;b. machine readable information carried on the base for identifying the user and the issuing institution; andc. a magnifying lens produced by formation of fresnel contour lines on the top surface of the base and in non-interfering relationship with the machine readable information.
摘要:
A vehicle speed monitoring system has a pair of parallel piezoelectric sensors or pressure transducers carried in closely spaced relation by a common elastomeric carrier such that the distance D between the sensors is maintained constant. A time measuring circuit connected to the sensors measures the time between peak voltages induced in the piezoelectric sensor transducers which is used to calculate and display vehicle speed. A weight is secured to or embedded in the carrier to cause the carrier to hug the roadway and be immune to lifting because of air currents and turbulence.
摘要:
A vehicle detector for detecting a moving vehicle traversing a predetermined roadway includes a coil antenna for detecting electromagnetic radiation inherently generated and emitted by the vehicle as it traverses the predetermined path and producing a first signal. A low noise amplifier receives and amplifies the first signal and outputs an amplified first signal to a differential full wave amplitude modulation envelope detector and produces a second signal. A high pass filter having a predetermined cutoff frequency is connected to receive the second signal and output only third signals having a magnitude proportional to the electromagnetic signal being detected. A converter circuit converts the third signals to a digital signal, the converter circuit including a switching comparator having a source of a stable voltage reference level and outputting a fourth signal. A hysteresis detector causes the comparator to switch upon detection and thereby prevent output switching due to slower or noisy input signals, and a utilization device is connected to receive and be actuated by the fourth signal.
摘要:
A financial transaction card adapted for use in reading externally stored information includes a substantially non-foldable rigid base and a strip for carrying machine readable information, The rigid base comprises a magnifying lens.