Dual surveillance camera system

• US 20070013779A1
• Filed: 08/30/2004
• Published: 01/18/2007
• Est. Priority Date: 08/28/2003
• Status: Active Grant

• Current Assignee: Bosch Security Systems Incorporated (Robert Bosch GmbH)
• Original Assignee: Bosch Security Systems Incorporated (Robert Bosch GmbH)
• Inventors: Gin, Jack, Hsu, Dan
• Granted Patent: US 7,724,280 B2
• Time in Patent Office: Days
• US Class Current: 348/159
• CPC Class Codes: G08B 13/19626 optical details, e.g. lenses, mirrors or multiple lenses
• CPC Class Codes: G08B 13/19636 pertaining to the camera
• CPC Class Codes: G08B 13/19643 wherein the cameras play different roles, e.g. different resolution, different camera type, master-slave camera
• CPC Class Codes: H04N 23/11 for generating image signals from visible and infrared light wavelengths
• CPC Class Codes: H04N 23/56 provided with illuminating means
• CPC Class Codes: H04N 23/74 by influencing the scene brightness using illuminating means
• CPC Class Codes: H04N 5/33 Transforming infrared radiation cameras or camera modules for generating image signals from infrared radiation H04N23/20; circuitry of SSIS for transforming infrared radiation into image signals H04N25/20
• CPC Class Codes: H04N 7/181 for receiving images from a plurality of remote sources

Abstract

A surveillance system having two specialized surveillance cameras with corresponding specialized illuminators is provided in a dual compartment container that eliminates internal light reflection problems by separating each camera and corresponding illuminator while combining each camera with an alternate illuminator, rendering the system more accurate, yet more compact and suited to unobtrusive placement. Considerable heat is generated by the specialized illuminators, requiring a heat sink to preserve illuminator life expectancy and to prevent the adjacent cameras from being adversely affected by the heat. Another feature enabling the system to work in its compact form despite the heat from the illuminators is that the protective case itself is adapted to be a heat sink for the illuminators.

Claims

1. A dual surveillance camera system comprising:

a) a camera adapted for recording images under a first type of illumination;

b) a second camera adapted for recording images under a second type of illumination;

c) a first illuminator for providing the first type of illumination;

d) a second illuminator for providing the second type of illumination;

e) a first compartment having a first translucent viewing pane and containing the first camera and the second illuminator;

f) a second compartment having a second translucent viewing pane and containing the second camera and the first illuminator;

in which the first and second compartments are separated from each other by an opaque wall preventing light from the first illuminator originating in the second compartment from reflecting off the second translucent pane directly to the first camera and preventing light from the second illuminator originating in the first compartment from reflecting off the first translucent pane directly to the second camera.

2. The dual surveillance camera system of claim 1, in which the first camera records images when the second illuminator is turned on, the second camera records images when the first illuminator is turned on, and the system switches between using the first illuminator and the second illuminator, depending on which type of illumination provides the best recorded image via its respective camera in ambient conditions for the system from time to time.

3. The dual surveillance camera system of claim 1, in which:

a) the first camera is a colour camera for observation under visible light;

b) the second camera is a monochrome camera for observation under infrared illumination;

c) the first illuminator is a visible light illuminator;

d) the second illuminator is an infrared illuminator.

4. The dual surveillance camera system of claim 1, in which the first and second compartments are formed by a box with a dividing wall.

5. The dual surveillance camera system of claim 1, in which the first and second compartments have cooling fins formed of a heat-conducting material.

6. The dual surveillance camera system of claim 1, in which the first and second compartments are contained in a box that is a heat sink.

7. The dual surveillance camera system of claim 4, in which the compartments are miniaturized to fit within standard electrical switch box dimensions in order to be adapted to be hidden behind a translucent decor switch plate.

8. The dual surveillance camera system of claim 3, in which the colour camera has a lens optimized for colour viewing, with infra-red filtering.

9. The dual surveillance camera system of claim 3, in which the monochrome camera has a lens optimized for monochrome viewing, with visible light filtering.

10. The dual surveillance camera system of claim 3, in which the monochrome camera is supercharged electronically for infrared sensitivity.

11. The dual surveillance camera system of claim 3, in which the infrared illuminator gives illumination in the range of from 805 to 995 nanometers of electromagnetic radiation.

12. The dual surveillance camera system of claim 3, in which the colour camera and the monochrome camera each have an independent lens having a separate varifocal control to enable a switch of mode from day to night operation without a focal shift.

13. The dual surveillance camera system of claim 2, in which

a) the first camera is a colour camera for observation under visible light;

b) the second camera is a monochrome camera for observation under infrared illumination;

c) the first illuminator is a visible light illuminator;

d) the second illuminator is an infrared illuminator.

e) the first and second compartments are formed by a box with a dividing wall;

f) the box is a heat sink with cooling fins formed of a heat-conducting material;

14. The dual surveillance camera system of claim 13, in which the compartments are miniaturized to fit within standard electrical switch box dimensions in order to be adapted to be hidden behind a translucent decor switch plate.

15. The dual surveillance camera system of claim 13 in which:

a) the colour camera has a lens optimized for colour viewing, with infra-red filtering;

b) the monochrome camera has a lens optimized for monochrome viewing, with visible light filtering;

c) the monochrome camera is supercharged for infrared sensitivity;

d) the infrared illuminator gives illumination in the range of from 805 to 995 nanometers of electromagnetic radiation.

e) the colour camera and the monochrome camera each have an independent lens having a separate varifocal control to enable a switch of mode from day to night operation without a focal shift.