Rain-Deflecting Side Mirror with a Pivoting Air-Guide Plate

The problem

During rain, water droplets accumulate on the side-view mirror glass and distort the reflected image. Drivers lose sight of vehicles in adjacent lanes, increasing the risk of lane-change collisions. Conventional solutions rely on electrical heating elements embedded behind the glass, which draw battery or alternator power and require several minutes to evaporate standing water. Aftermarket hydrophobic coatings degrade over time and need reapplication. According to the patent, the objective is to prevent raindrops from remaining on the mirror surface by using a structural arrangement that directs airflow toward the mirror surface.

The solution

1. An air passage (3) is formed along the top of the side mirror housing (1). Its outlet points downward toward the face of the rearview mirror glass (2), and the angle between the passage and the glass surface is acute.
2. At the inlet of the air passage, a guide plate (4) is mounted on a shaft (6) connected to a driving device. The driving device controls the rotation of the plate relative to the housing.
3. When deployed, the guide plate is rotated at the inlet to introduce airflow into the air passage. The passage width gradually decreases from inlet to outlet, and the outlet faces the mirror glass.
4. The housing includes a guide plate slot (5) shaped to receive the plate. One end of the plate has a protruding circular-arc planar surface, and the other end has a protruding arc surface. Corresponding groove portions inside the slot provide face-to-face sliding contact.
5. A planar section (7) at the upper part of the circular-arc groove limits the maximum opening angle of the guide plate to no more than 90 degrees from horizontal.
6. When closed, the guide plate fits entirely within the slot. The mirror glass length falls within the coverage area of the air passage.

Who it is for

• Aftermarket automotive accessory brands seeking a mechanical rain-clearing mirror upgrade.
• Commercial fleet operators (trucks, delivery vans, buses) whose vehicles spend long hours in varied weather and benefit from visibility aids.
• OEM mirror tier suppliers evaluating structural features to differentiate their housing designs for mid-range vehicle platforms.
• Off-road and agricultural equipment manufacturers where electrical heating elements may be vulnerable to vibration or moisture ingress.

How it works

The main parts

Operating steps

1. Deploy the guide plate - the driving device rotates the shaft (6) so the plate (4) rotates relative to the side mirror housing (1).
2. Direct airflow - the guide plate directs airflow into the inlet of the air passage (3).
3. Passage geometry - the passage width gradually decreases from inlet to outlet. The angle between the passage and the mirror glass (2) is acute.
4. Clear water - the moving air pushes raindrops off the glass before they can pool, maintaining a clear reflection.
5. Stow the plate - when rain stops or the vehicle parks, the driving device rotates the plate back until it sits fully inside the guide plate slot. The planar section (7) prevents over-rotation during deployment.

Applications

Highway driving in heavy rain

At sustained speeds, the volume of air entering the passage sweeps large droplets off the glass continuously. Drivers changing lanes on wet highways maintain an unobstructed view of adjacent traffic without waiting for a heater element to warm up.

Commercial truck fleets

Long-haul trucks encounter diverse weather across routes. Adding electrical heating to every mirror increases wiring complexity and alternator load. A structural aerodynamic housing reduces maintenance points while keeping mirrors clear during prolonged rain exposure on interstates.

Delivery vans in urban areas

Frequent stops and starts mean heated mirrors cool down between deliveries. The guide plate deploys instantly, providing airflow across the glass during short bursts of travel between drop-off points in rainy conditions.

Agricultural and construction equipment

Tractors and excavators operate in muddy, wet environments where electrical components face higher failure risks from vibration and water ingress. A mechanical air-guide system built into the mirror housing avoids fragile heating wires and connectors.

Off-road and overland vehicles

Overland builds prioritize reliability over complex electronics. A folding guide plate that stows fully when parked on trails provides active rain clearing once the vehicle is moving on wet roads.

Where it is less suitable

• Stationary driving - when parked, no air passes through the duct, so droplets will remain on the glass.
• Vehicles with highly streamlined mirror pods - some modern aerodynamic mirror shapes leave little room for a top-mounted passage without altering the approved housing envelope.
• Regions with freezing rain or ice - the mechanism clears liquid water but does not generate heat. Ice accumulation requires a separate thermal solution.