Snow accretion prevention device for vehicle detectors and its design method

摘要

PROBLEM TO BE SOLVED: To provide a snow accretion prevention device for a vehicle detector having a high snow accretion prevention effect and a design method thereof. SOLUTION: This is a snow accretion prevention device 1 for a vehicle detector provided in a vehicle detector 2 or 2A installed at an ETC gate. It is provided with a vertically long opening 11 that accommodates either a light projecting element that irradiates the vehicle with detection light or a light receiving element that receives the detection light emitted by the light projecting element and allows the detection light to pass through. A pair of left and right center covers 23, 23 and a pair of left and right center covers 23, 23, which are provided on the box body 3 and project forward from the front surface portion 4 of the box body 3 and are arranged so as to sandwich the opening 11, sandwich the pair of left and right center covers 23, 23. Since it is provided with a pair of left and right outer covers 24, 24 projecting forward, when wind is received from the front side, the pressure in the space between the central cover 23 and the outer cover 24 rises, and new air invades. Since it is prevented, it is possible to suppress the intrusion of snow between the central covers 23 and 23. [Selection diagram] Fig. 1