Patents Assigned to GDB Enterprises, Inc.
  • Patent number: 5486914
    Abstract: In a handheld incident light meter instrument, a custom LCD panel provides both a digital readout and a bar graph array which simulates an analog meter but uses no moving mechanical parts and which may be operated in a choice of modes: bar, floating zone or dedicated. Unusual accuracy and stability over a wide dynamic range, from 0.1 to over 50,000 footcandles, are achieved in a novel analog photo-amplifier portion having a linear autoranging preamplifier, an averaging integrator and a temperature-compensated log converter, driving an IC analog-to-digital converter connected to a microprocessor programmed to operate in a choice of modes to operate the LCD via a driver to display light readings according to commands entered via a set of ergonomic user controls. Battery condition is displayed continuously. The digital readout may be backlit for low ambient light level.
    Type: Grant
    Filed: June 27, 1994
    Date of Patent: January 23, 1996
    Assignee: GDB Enterprises, Inc.
    Inventors: Thomas F. Denove, William L. Blowers