Vehicular camera with lens heater

Abstract

A camera for a vehicular vision system includes a housing and a lens barrel including a lens. The camera is configured to be disposed at an exterior portion of a vehicle so as to have a field of view exterior of the vehicle. A heating device is disposed at an exterior of the lens barrel. The heating device includes a thin foil heating element that at least partially circumscribes the lens barrel. The heating device includes an electrical lead that is configured to electrically connect to an electrical connector of the vehicle when the camera is disposed at the exterior portion of the vehicle. Responsive to a determination of current drawn by the heating device, a control of the camera determines the temperature at the lens and controls operation of the heating device based at least in part on the determined temperature.

1 . A camera for a vehicular vision system, said camera comprising:
 a camera housing;   a lens barrel including a lens having lens optics disposed in said lens barrel, wherein said lens barrel is attached at said camera housing so that said lens is optically aligned with an imager disposed in said camera housing;   wherein said camera is configured to be disposed at an exterior portion of a vehicle so as to have a field of view exterior of the vehicle;   a heating device disposed at an exterior of said lens barrel, said heating device comprising a thin foil heating element that at least partially circumscribes said lens barrel;   a control that controls operation of said heating device responsive at least in part to temperature at said lens;   wherein said heating device includes an electrical lead that is configured to electrically connect to an electrical connector of the vehicle when said camera is disposed at the exterior portion of the vehicle; and   wherein, with said camera disposed at the exterior portion of the vehicle and with said electrical lead electrically connected to the electrical connector of the vehicle, and responsive to a determination of current drawn by said heating device, said control estimates the temperature at said lens, and wherein said control controls operation of said heating device based at least in part on the estimated temperature.   
     
     
         2 . The camera of  claim 1 , wherein, responsive to determination that the estimated temperature at said lens is below a threshold temperature, said control operates said heating device to increase the temperature of said lens barrel of said camera. 
     
     
         3 . The camera of  claim 1 , wherein said control deenergizes said heating device responsive to determination that a threshold time period following energization of said heating device has elapsed. 
     
     
         4 . The camera of  claim 1 , wherein said control deenergizes said heating device responsive to determination that a power consumption of said heating device reaches a threshold level. 
     
     
         5 . The camera of  claim 1 , wherein said control deenergizes said heating device responsive to determination that the estimated temperature at said lens is at or above a threshold temperature. 
     
     
         6 . The camera of  claim 1 , comprising a washer having a connector and fluid passageway, and wherein said connector, with said camera disposed at the exterior portion of the vehicle, is connected to a washer system of the vehicle such that, when the vehicle washer system is actuated, pressurized fluid flows through said fluid passageway and onto said lens. 
     
     
         7 . The camera of  claim 1 , wherein said camera is configured to be fixedly mounted at the exterior portion of the vehicle. 
     
     
         8 . The camera of  claim 7 , wherein, with said camera fixedly mounted at the exterior portion of the vehicle, said lens is exposed at the exterior portion of the vehicle. 
     
     
         9 . The camera of  claim 1 , comprising a temperature sensor for sensing a temperature at said camera, wherein, with said camera disposed at the exterior portion of the vehicle and with said electrical lead electrically connected to the electrical connector of the vehicle, and responsive to an output of said temperature sensor that is indicative of the temperature at said camera being below a threshold level, said control operates said heating device to increase the temperature of said lens barrel of said camera. 
     
     
         10 . The camera of  claim 1 , wherein, with said camera disposed at the exterior portion of the vehicle and with said electrical lead electrically connected to the electrical connector of the vehicle, said control energizes said heating device responsive to determination that an ambient temperature is below a threshold temperature. 
     
     
         11 . The camera of  claim 1 , wherein said heating device, when said camera is disposed at the exterior portion of the vehicle and when said heating device is electrically powered, heats said lens barrel and the lens optics disposed therein. 
     
     
         12 . A camera for a vehicular vision system, said camera comprising:
 a camera housing;   a lens barrel including a lens having lens optics disposed in said lens barrel, wherein said lens barrel is attached at said camera housing so that said lens is optically aligned with an imager disposed in said camera housing;   wherein said camera is configured to be disposed at an exterior portion of a vehicle so as to have a field of view exterior of the vehicle;   a heating device disposed at an exterior of said lens barrel, said heating device comprising a thin foil heating element that at least partially circumscribes said lens barrel;   a control that controls operation of said heating device responsive at least in part to temperature at said lens;   wherein said heating device includes an electrical lead that is configured to electrically connect to an electrical connector of the vehicle when said camera is disposed at the exterior portion of the vehicle;   wherein, with said camera disposed at the exterior portion of the vehicle and with said electrical lead electrically connected to the electrical connector of the vehicle, said control energizes said heating device responsive to determination that an ambient temperature is below a threshold temperature;   wherein, with said camera disposed at the exterior portion of the vehicle and with said electrical lead electrically connected to the electrical connector of the vehicle, and responsive to a determination of current drawn by said heating device when said heating device is energized, said control determines the temperature at said lens;   wherein, responsive to the determined temperature at said lens being below a first threshold temperature, said control operates said heating device to increase the temperature of said lens barrel of said camera; and   wherein said control deenergizes said heating device responsive at least in part to determination that the determined temperature at said lens is at or above a second threshold temperature that is greater than the first threshold temperature.   
     
     
         13 . The camera of  claim 12 , wherein said control deenergizes said heating device responsive to determination that a threshold time period following energization of said heating device has elapsed. 
     
     
         14 . The camera of  claim 12 , wherein said control deenergizes said heating device responsive to determination that a power consumption of said heating device reaches a threshold level. 
     
     
         15 . The camera of  claim 12 , wherein said control energizes said heating device responsive to determination that an ambient temperature is below a threshold temperature. 
     
     
         16 . The camera of  claim 12 , comprising a temperature sensor for sensing a temperature at said camera, wherein, with said camera disposed at the exterior portion of the vehicle and with said electrical lead electrically connected to the electrical connector of the vehicle, and responsive to an output of said temperature sensor that is indicative of the temperature at said camera being below a threshold level, said control operates said heating device to increase the temperature of said lens barrel of said camera. 
     
     
         17 . A camera for a vehicular vision system, said camera comprising:
 a camera housing;   a lens barrel including a lens having lens optics disposed in said lens barrel, wherein said lens barrel is attached at said camera housing so that said lens is optically aligned with an imager disposed in said camera housing;   wherein said camera is configured to be disposed at an exterior portion of a vehicle so as to have a field of view exterior of the vehicle;   a heating device disposed at an exterior of said lens barrel, said heating device comprising a thin foil heating element that at least partially circumscribes said lens barrel;   a control that controls operation of said heating device responsive at least in part to temperature at said lens;   wherein said heating device includes an electrical lead that is configured to electrically connect to an electrical connector of the vehicle when said camera is disposed at the exterior portion of the vehicle;   wherein, with said camera disposed at the exterior portion of the vehicle and with said electrical lead electrically connected to the electrical connector of the vehicle, said control energizes said heating device responsive to determination that an ambient temperature is below a threshold temperature;   wherein, with said camera disposed at the exterior portion of the vehicle and with said electrical lead electrically connected to the electrical connector of the vehicle, and responsive to a determination of current drawn by said heating device when said heating device is energized, said control determines the temperature at said lens, and wherein said control controls operation of said heating device based at least in part on the determined temperature; and   wherein said control deenergizes said heating device responsive to determination that a threshold time period following energization of said heating device has elapsed.   
     
     
         18 . The camera of  claim 17 , wherein, responsive to determination that the temperature at said lens is below a threshold temperature, said control operates said heating device to increase the temperature of said lens barrel of said camera. 
     
     
         19 . The camera of  claim 17 , wherein said control deenergizes said heating device responsive to determination that the temperature at said lens is at or above a threshold temperature. 
     
     
         20 . The camera of  claim 17 , wherein said control deenergizes said heating device responsive to determination that a power consumption of said heating device reaches a threshold level.