×

Defogging device for a surveillance camera

  • US 20070109441A1
  • Filed: 11/15/2005
  • Published: 05/17/2007
  • Est. Priority Date: 11/15/2005
  • Status: Active Grant
First Claim
Patent Images

1. A defogging device for a surveillance camera having a case with a front end, an inner cavity, an inner surface and multiple threaded seats formed on and protruding in from the inner surface near the front end of the case, and each threaded seat having a threaded hole facing the front end;

  • a surveillance camera mounted in the inner cavity of the case and having a lens, a camera mechanism and a power source;

    a washer mounted in the front end of the case against the threaded seats and has an inside surface and an annular groove formed in the inside surface of the washer;

    a lens cover mounted in the annular groove in the washer and having an exterior surface, a center and an outer edge;

    a retaining ring mounted against the lens cover and holding the washer and the lens cover in the front end of the case; and

    multiple fasteners through the washer and the retaining ring and into the threaded seats to hold the lens cover in the front end of the case, and the defogging device comprising a heating device adapted to be mounted on the lens cover concentrically with the camera lens and to melt frost and dissipating moisture on the lens cover and having a heating element adapted to be mounted concentrically on the lens cover near the outer edge; and

    two contacts attached respectively to the ends of the heating element and adapted to be located at the outer edge of the lens cover;

    a circuit board for comparing ambient temperature to a preset temperature and activating the heating device and that has a power input terminal;

    a power output terminal; and

    a temperature sensor mounted between the power input terminal and the power output terminal to compare ambient temperature to a preset temperature and activate the heating device; and

    a power cord connected to the circuit board and the heating device and comprising an electrical cord having a proximal end; and

    a distal end connected securely to the terminals of the heating device; and

    a plug connected to the proximal end of the electrical cord and connected to the power output terminal of the circuit board.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×