Lens defogging system for parking lot entrance and exit recognition cameras

Abstract

The invention discloses a lens defogging system for parking lot entrance and exit recognition cameras. The lens defogging system comprises a hot air defogging module, a heating defogging module, a sensor module and a controller. The hot air defogging module is installed between a housing and a lens, and comprises a piezoelectric fan and a heating body. The heating defogging module includes a connecting portion attached to the lens and a plurality of heating elements disposed on the connecting portion at intervals. The sensor module includes a temperature sensor and a temperature and humidity sensor. The temperature sensor is installed on the outer surface of the housing. The temperature and humidity sensor is mounted on a side between the housing and the lens and away from the hot air defogging module. The lens defogging system combines two high-efficiency defogging modes including a heating defogging mode and a hot air defogging mode, compares the internal temperature of the camera with the external temperature by the controller, compares the internal humidity with the set humidity, and automatically selects a proper defogging solution according to a comparison result so as to automatically and efficiently defog the lens.

Description

technical field [0001] The invention relates to the technical field of lens defogging, in particular to a lens defogging system of a parking lot entrance / exit recognition camera. Background technique [0002] With the development of society and the improvement of people's living standards, people pay more and more attention to the camera monitoring system at the entrance and exit of the parking lot, but the performance of the monitoring camera directly affects the function of the monitoring system. During the operation of the surveillance camera, the internal temperature is relatively high, and generally no water mist will be generated. However, if there is water vapor in the casing itself, such as the inner wall of the casing, PCB, wires, etc. If the temperature is too high, water mist will naturally appear; or the casing is not well sealed and waterproof, and if it is installed in a reservoir or a humid place, water vapor will enter; or if the temperature difference betwee...

AI Technical Summary

Problems solved by technology

The defogging method of anti-fog coating is to coat a layer of anti-fog coating on the surface of the lens. At present, the cost is relatively high, the yield rate is not high, and the use environment is relatively strict; the defogging effect of the desiccant defogging method and the fan defogging method is not good. Good; the heating defogging method is more suitable for the situation where the temperature difference between the internal and external environments of the camera is large; and the wind heat defogging method is more suitable for the situation where the internal humidity of the camera is high

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