MXPA99005270A - A mirror pane especially for rearview mirror for motor vehicles. - Google Patents

Abstract

A mirror pane suitable for use on rearview mirrors for motor vehicles includes a front and a back side, a carrier plate, a reflection coating applied on the carrier plate, and at least one side formed by the reflection coating and the glass plate, and a dirt and water repellant protective coating applied to the front side as the outermost coating. The coating may be an inorganic-organic nanocomposite, gradient coating with fluoridized organic side chains.

Description

MIRROR GLASS ESPECIALLY FOR REAR VIEW MIRROR OF MOTORIZED VEHICLES Description of the invention The invention is concerned with a mirror glass, especially for rear-view mirrors of motor vehicles as well as with a rear-view mirror system with a mirror glass of this type. he knows about aviation technology how to coat the windshield glass of the cabin with a water repellent coating. This water repellent coating prevents the accumulation of scratches and due to the high air speed of the airplanes, the line of sight for the pilot remains clear. Also, in the field of hygiene engineering, coatings for Plexiglas walls and shower enclosures, etc. are offered, which are repellent to the garbage and facilitate cleaning them. The mirror glass of the mirrors in motor vehicles accumulate garbage due to its location exposed to the rain and the dew concurrent with it, which as a result that the clear vision is obstructed. This obstruction of sight must be repeatedly cleared by manual cleaning. This frequent cleaning leads to a deeper deposit of garbage and other corrosive substances in the peripheral areas of the mirror glass. In these peripheral areas, several layers REF. : 30480 in a mirror glass extend outwards, beyond the glass and thus this peripheral area is especially subject to corrosion. This is particularly true with respect to mirrors that employ silver as the reflective layer on the back side. It is now recognized a need, in the case of mirror glass, to reduce the accumulation of garbage in peripheral areas. Hence, because of the foregoing, the purpose of the invention is to make a mirror glass available, especially for rear-view mirrors of motor vehicles, in which a large undesirable deposit of garbage and corrosive substances in the peripheral areas is prevented. Furthermore, it is a purpose of the present invention to make available a rear view mirror with a mirror glass of the type described. The attainment of these purposes can be carried out by means of the features of claims 1 and 2. By coating the mirror glass with a known garbage and water repellent protective coating, following the practice of hygiene technology and of flight, the point reached is that the beads of dew water coalesce in large drops, although the front part of the mirror glass is not facing the direction of travel and thus does not meet with the flow of water through.

Through this coalescence in large droplets, garbage and other corrosive substances remain in suspension or solution in the rainwater, to be carried in the wind through and removed from the peripheral areas. By this, a collective agglomeration of the corrosive substances in the peripheral areas is prevented. In addition, it has been determined counterintuitively, that these known protective coatings are very resistant to scratches and are also easier to free from frost or packing and from the accumulation of ice. Presented as especially well suited for such protective coatings, INM (Institute for New Materials, gem, GmbH) has developed and marketed an inorganic, nano-composite step coat, with fluorinated organic side chains that are presented as "coatings". Easy to clean. " The coatings that use this material are optically transparent, exhibit a high stability to ultraviolet light, as well as a high resistance to scratches and abrasion. This material is susceptible to application by conventional means, such as coatings by immersion, spraying or centrifugation with subsequent photochemical and thermal hardening. The protective coating is applied to the front side of the mirror glass as the outermost film.

It is also adapted for the front surface of the mirror and the rear surface of the mirror. In the case that the chromium is the reflective material then coated simultaneously, the resistance to the stripes is substantially increased. With this situation, it becomes possible to install this kind of a coated mirror on the front in the domain of commercial vehicles. The advantage of the lower reflectivity and the improved freedom of glare can be obtained with this material without a concurrent loss in the scratch resistance. The advantage of a lower degree of garbage accumulation is also valid naturally in the case of mirrors coated on the sides with chrome or silver as the reflective coating. According to a particularly advantageous embodiment of the invention, the protective coating is also brought on the peripheral sides of the mirror glass; whereby the interstitial space between the glass plate and the reflection coating are sealed and thus protected. This is particularly important with the mirror coated on the sides that has silver as the reflecting medium, since these mirrors corrode very easily if the border coating on the periphery is not protected. Usually, in the case of the known rear coated mirrors with silver as the reflecting agent, these sensitive border coatings are covered with a protective coating and sealed. According to the present invention with the mirror, simultaneously, a garbage and water repellent coating is placed on the front side and a sealing of the peripheral area is obtained at the edges. The application of an additional protective coating on the peripheral edges on the sides thus becomes superfluous. As carrier plates, glass and plastic plates can be considered. When thinking about a reflective coating and due to the high scratch resistance of the protective coating, in addition to the chromium, the installations can be made with the softer and more sensitive aluminum coatings and sensitive interference coatings. Further details, features and advantages of the invention will become apparent from the following description of the preferred embodiments with reference to the drawings. Wherein: Figure 1 is a sectional view through the mirror glass of a mirror coated on the front with chrome as the reflective or reflective coating and Figure 2 is a sectional view through the mirror glass of a mirror coated by behind with silver as the reflective coating. Figure 1 shows a section through a type of front surface of a mirror glass that is in accordance with the present invention. This mirror glass exhibits a front side 2, which is the side which will be observed and a rear side 4. A glass plate 6 has front and rear main surfaces 8 and 9, also as sides 10. The side 10 has areas of the beveled edges 12 and 13 which are respectively designed as "upper" e * lower. "On the glass of the first main surface 8 a coating (14) of chromium is applied as the reflecting means, i.e. the reflection coating 14 is It is located on the front side of the mirror glass, in such a way that the mirror can be designated as a "front coated mirror." A protective coating 16 is applied as the outermost coating on the front side 2 consisting of a repellent material. in the garbage and water, the protective coating 16 in this case is extended from the front side 2 onto the upper bevelled area 12 on the side.Thus, the protective coating 16 also protects to the border area, in which the chrome coating 14 and the glass plate 8 form the upper bevel edge 12. Due to the scratch-resistant coating in this chrome coating 14 inherently sensitive to the stripes of the front surface of the mirror, the installation of this mirror is possible for commercial vehicles and commercial motorized vehicles. Figure 2 shows a second advantageous embodiment of the invention in the form of a mirror glass for a rear mirror coated with silver as the reflection coating. The mirror according to this second embodiment also includes a glass plate 6 with a front main surface 8 and a rear main surface 9. The sides 10 thereof possess beveled edge areas 12 and 13. On the rear main surface 9 is respectively, a coating of plate 20, on top of this a copper coating 22, on it a coating of lacquer base and finally a coating of coating lacquer 26. The glass plate 6 in the area of the second main surface 9 and the coatings 20 to 26 form the lower localized bevelled edge 13. On the upper main surface 8 once a protective coating 28 is applied to the glass plate, which covering 28 also covers the side 10 that includes the beveled edge 12 and 13.

In this way, with one operation stage and with a protective coating 28 not only the front side 2 of the mirror plate, this is the main surface 8 of the glass plate 6 but also the corrosion sensitive sides 10, especially the lower bevelled edge 13 is provided with a garbage and water repellent coating. It is noted that, in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it refers.

Claims (12)

1. Claims Having described the invention as above, the content of the following claims is claimed as property: 1. A mirror glass, especially for rear-view mirrors of motor vehicles, with a front and a rear side, a carrier plate, a cover of reflection applied on the carrier plate and at least one side formed by the reflection coating and the glass plate thereon, characterized in that a protective garbage and water repellent coating is applied to the front side as the outermost coating.
2. 2. A mirror glass according to claim 1, characterized in that the protective coating is a gradient, nano-composite, inorganic-organic coating with fluorinated organic side chains.
3. 3. A mirror glass according to claim 1 or 2, characterized in that the carrier plate is made of glass.
4. 4. A mirror glass according to claim 1, characterized in that the carrier plate is made of plastic.
5. 5. A mirror glass according to any of the preceding claims, characterized in that the reflection coating is a silver coating.
6. 6. A mirror glass according to any of claims 1 to 4, characterized 5 because the reflection coating is a chromium coating.
7. 7. A mirror glass according to any of claims 1 to 4, characterized in that the reflection coating is a coating of aluminum.
8. 8. A mirror glass according to any of claims 1 to 4, characterized in that the reflection coating is an interference coating.
9. 9. A mirror glass according to claim 1, characterized in that the mirror glass is a front surface mirror with a reflection coating applied on the front side which is especially of chromium and because the coating protector is applied on the reflection coating.
10. A mirror glass according to any of the preceding claims 1 to 8, * characterized in that the mirror glass is a mirror 25 coated at the rear with a reflection coating, particularly silver, applied to the back side and because the coating Protector on the front side is applied as a transparent carrier plate.
11. 11. A mirror glass according to any of the preceding claims, characterized in that the protective coating covers at least the boundary area between the reflector coating and the carrier plate and also the edges.
12. 12. A rearview mirror for motor vehicles, in particular for commercial vehicles, with an articulated box and a mirror glass advantageously rotatably retained on the box, characterized in that it is in accordance with any of the preceding claims. SUMMARY OF THE INVENTION The invention is concerned with a mirror glass, especially for rear-view mirrors of motor vehicles as well as with a rearview mirror system with a mirror glass of this type.