JPH08268232A - Waterdrop removal device for vehicle window - Google Patents

Abstract

PURPOSE: To provide a waterdrop removal device for a vehicle such as an automobile attempting protection of a water repellent treated layer as well as preventing a judder on a windshield applied with water repellent treatment. CONSTITUTION: A piezoelectric transducer 2 is fixed on a car body frame 1. A window glass 4 is installed on the car body frame 1 by an adhesive 3 through this piezoelectric transducer 2. Water repellent treatment is applied onto the window glass 4. At the time of traveling in the rain, the water repellent treated window glass 4 is oscillated at specified frequency by applying driving voltage to the piezoelectric transducer 2 from a high frequency electric power source. Consequently, waterdrops on a window glass surface slide on the glass surface and drop. In this case, the small waterdrops on the glass surface are gathered by oscillation, the waterdrop become larger and dropping behavior is promoted by their selfweight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water drop removing device for a vehicle window such as an automobile, and more particularly to a water drop removing device applied to a window which has been subjected to water repellent treatment.

[0002]

2. Description of the Related Art A windshield of a vehicle is provided with a wiper device for removing rainwater on a glass surface during rainy weather operation. Such a conventional wiper device wipes the glass surface by moving the blade attached to the tip of the wiper arm while pressing it against the glass surface with a constant pressure.

FIG. 2 shows a blade cross section of a conventional wiper device. The tip 15a of the blade 15 made of an elastic material such as rubber is pressed against the window glass (not shown) with a constant pressure to slide on the surface of the window glass, and the rainwater on the surface is wiped off while rubbing the surface of the glass. Remove. in this case,
Since a water film is formed on the ordinary glass surface, this water film reduces the frictional force of the blade and the wiper operation is smoothly performed.

On the other hand, a windshield having a water repellent treatment applied to a window glass of an automobile has been conventionally used. Examples of the water repellent treatment include a method in which an inorganic glass is dipped in a solution composed of polydimethylsiloxane and a liquid hydrocarbon at room temperature, applied by a dipping method, and then baked to form a polyfluoroalkyl group. A method of applying a contained silane compound or other fluorine-based water repellent agent to the glass surface is used. By applying such a water-repellent treatment, rainwater on the glass surface is repelled to form water droplets, which prevents the formation of a water film on the glass surface, and reduces the area that wets the glass surface to maintain good visibility. Be done.

[0005]

However, since a water film is not formed on the glass surface of the windshield which has been subjected to the water repellent treatment due to the water repellent treatment, therefore, the windshield wiper is used to remove the water droplets of the windshield during rainy weather traveling. When the is operated, the blade of the wiper and the glass surface are in direct contact with each other, which increases the friction coefficient and causes pulsation (judder) with the movement of the blade, which causes unpleasant noise and smooth removal of water droplets caused by rainwater. It causes a problem that it can not be done. Further, since the blade slides on the water-repellent surface with a large frictional force, the water-repellent agent peels off, the water-repellent effect is reduced, and the service life of the water-repellent layer is shortened.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a water drop removing device for a vehicle such as an automobile capable of preventing judder due to a wiper in a windshield.

It is another object of the present invention to provide a water drop removing device for vehicles such as automobiles, which prevents judder due to a wiper in a windshield that has been subjected to a water repellent treatment and protects the water repellent treatment layer.

[0008]

In order to achieve the above object, the present invention provides a water drop removing device for a vehicle window, characterized in that high frequency vibration means is provided between a window glass and a vehicle body frame. .

In a preferred embodiment, the high frequency vibrating means comprises a piezoelectric vibrator.

It is particularly preferable that the window glass is a water-repellent window glass.

[0011]

The high-frequency vibration (ultrasonic vibration) of the window collects small water droplets on the glass surface to form relatively large water droplets, and slides and drops on the glass surface by its own weight.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of the essential parts of a water droplet removing device according to an embodiment of the present invention. The piezoelectric vibrator 2 is fixed to the body frame 1. The window glass 4 is attached to the vehicle body frame 1 with the adhesive 3 via the piezoelectric vibrator 2. The window glass 4 is subjected to the above-mentioned water repellent treatment. 5 is a mall for preventing rainwater intrusion and for decoration. When traveling in rainy weather, a driving voltage is applied to the piezoelectric vibrator 2 from a high frequency power source (not shown) to vibrate the window glass 4 which is water repellent at a predetermined frequency. As a result, water droplets on the surface of the window glass slide on the glass surface and fall. In this case, the small water droplets on the glass surface are gathered together by the vibration, and the water droplets become large, so that the dropping action due to the self-weight is accelerated.

When vibrating the window glass 4, it is preferable to use a frequency band in which the vibration hardly affects the visibility of human eyes. By using the high frequency power supply in such a frequency band, the vibration of the windshield during rainy weather does not reduce the visibility of the driver, and safe driving is ensured.

In order to remove dirt on the windshield, it is also preferable to use a conventional conventional wiper device together.

[0015]

As described above, in the present invention, since the glass itself of the windshield is vibrated by using the piezoelectric vibrator or the like to remove the water droplets on the surface thereof, the friction as in the conventional wiper is eliminated. There is no judder due to contact, especially water drops on the water-repellent glass surface can be effectively and smoothly removed, good visibility in rainy weather is maintained, visibility is improved and it contributes to accident prevention. be able to. Further, unlike the conventional case, since the blade does not come into sliding contact with the glass surface, the water repellent treatment layer is not rubbed, the deterioration of the water repellent function is prevented, and the water repellent effect can be maintained for a long time.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of a water droplet removal device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional wiper.

[Explanation of symbols]

 1: Body frame 2: Piezoelectric vibrator 3: Adhesive 4: Window glass 5: Mold

Claims (3)

[Claims] 1. A water drop removing device for a vehicle window, characterized in that high-frequency vibration means is provided between the window glass and the body frame. 2. The water drop removing device for a vehicle window according to claim 1, wherein the high-frequency vibrating means comprises a piezoelectric vibrator. 3. The water drop removing device for a vehicle window according to claim 1, wherein the window glass is a window glass subjected to a water repellent treatment.