Turn signal unit for an external mirror

A turn signal unit for an external mirror for a motor vehicle is designed to radiate a flashing light forwards in the direction of travel with the turn signal unit and the external mirror in the installation position at the side of the vehicle. The turn signal unit includes a light source and a lens disposed in front of the light source. A film with alternating light transmissive and non-light transmissive structures is clamped in the space between the light source and the lens. The film is clamped via a clamping structure which includes structure that is part of the lens and/or a housing portion of the turn signal unit.

CROSS REFERENCE TO RELATED APPLICATION

The invention is based on a priority patent application DE 10 2016 212 527.3, filed Jul. 8, 2016, which is hereby incorporated herein by reference in its entirety.

FIELD OF THE INVENTION

The present invention relates generally to the field of exterior rearview mirror assemblies for vehicles and, more particularly, exterior rearview mirror assemblies that include a turn signal unit.

BACKGROUND OF THE INVENTION

External mirrors that comprise a turn signal unit are well known. They are increasingly popular additional turn signal devices in motor vehicles and on the one hand increase the safety of the vehicle and on the other hand enhance the vehicle aesthetically.

Various embodiments of external mirrors with integrated turn signals are known, for example from US 2007/0279923 A1.

A light window for an illuminated unit in an external mirror arrangement is known from DE 10 2011 103 200 A1, wherein the light window is matched to the external contour of the housing of the external mirror arrangement and the light window closes an opening in the housing of the external mirror arrangement, and wherein the light window acts as a light conductor and comprises output coupling structures at one point at least of the light window, wherein the light window is made of an optical film with a sprayed-on coating that is implemented as a light conductor, and wherein the optical film contains at least one output coupling structure. Features such as captions can be integrated within the film. The film is completely integrated within a plastic material forming the coating and a protective layer.

SUMMARY OF THE INVENTION

The present invention concerns a turn signal unit for an external mirror for a motor vehicle, wherein the turn signal unit is arranged to radiate a flashing light forwards in the direction of travel with the turn signal unit and the external mirror in the installation position and concerns an external mirror comprising such a turn signal unit.

It is an object of the invention to provide a turn signal unit for an external mirror for a motor vehicle, wherein the optical design of the turn signal unit can be altered simply and inexpensively for various types of vehicles or various vehicles.

The object is achieved by a turn signal unit for an external mirror for a motor vehicle, wherein the turn signal unit is designed to radiate flashing light forwards in the direction of travel in the installation position, wherein the turn signal unit comprises a light source and a lens disposed in front of the light source, and wherein a film with alternating light transmissive and non-light transmissive structures is clamped in the space between the light source and the lens.

In this case, “in front of” according to the invention means in the illumination direction and thereby also forwards in the direction of travel of the motor vehicle—accordingly “behind” refers to the reverse direction, i.e., opposite to the illumination direction of the turn signal.

According to the invention, a film is disposed between the light source and the lens, which preferably forms the outer boundary of the turn signal unit, and is fixed by clamping. The film carries alternating light transmissive and non-light transmissive structures, i.e., structured sections, so that it structures the emanating light during flashing and can form patterns, styles, captions, logos and similar for example.

The film is clamped and preferably not fixed in other ways in the turn signal unit; in particular it is not glued or sprayed, so that the film can easily be replaced.

This enables the optical design of the turn signal unit to be changed very simply and inexpensively for different types of vehicle or vehicles during the manufacture thereof, or even thereafter depending on the implementation by replacing the film.

The alternating light transmissive and non-light transmissive structures of the film preferably form a pattern, in particular a visually appealing design, a caption and/or a logo.

The turn signal unit preferably comprises an aperture or element between the light source and the lens. The film can then preferably be clamped by the aperture or element and the lens, i.e., be clamped between the aperture element and the lens. The aperture element and the lens can have approximately the same size.

The turn signal unit preferably comprises a housing floor behind the light source. The film can be clamped by the housing floor and the lens. The housing floor can likewise be of a similar size to the lens and can preferably be slightly larger than the lens and can hold the lens and/or accommodate the lens as a frame.

If the turn signal unit comprises a housing floor behind the light source and an aperture or element between the light source and the lens, the film can be clamped by the housing floor and the aperture element. A clamping effect can also be achieved by the housing floor, aperture and lens together.

The housing floor and/or the aperture element and/or the lens preferably comprises at least one shape that is designed to clamp the film in a non-slip manner, in particular a flange that can be oriented parallel to the film, or a spring element or a groove element. As a result, the film can in particular be clamped between two flange surfaces and/or between groove and spring elements.

The light source of the turn signal unit can preferably be formed by a light conductor and/or by LEDs.

The lens can also be permanently fixed after attaching the film, in particular it can be welded to the housing.

A plurality of films can also be used in a turn signal unit according to the invention, preferably with all films being clamped.

An external mirror according to the invention for a motor vehicle comprises a turn signal unit as described above. In the case of an installed external mirror, the turn signal unit is disposed in the external mirror such that the flashing light is essentially radiated forwards in the direction of travel, and in doing so passes through the clamped film with light transmissive and non-light transmissive structures. The film acts as a mask for the flashing light in order to combine the forward-radiating light field of the turn signal with optical structures, such as patterns, captions or logos. The optical structures are preferably only visible, or only markedly visible, if the turn signal is active.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

InFIG. 1, a turn signal unit according to the invention for an external mirror for a motor vehicle is shown in an exploded representation. The turn signal unit comprises—looking in the direction of travel of the vehicle and in the illumination direction of the turn signal unit, which is at the upper edge of the image inFIG. 1—the following components from the rear forwards: a housing floor5that acts as a support for the turn signal unit, a control unit9, which can be implemented as a PCBA (Printed Circuit Board Assembly) and that can form an electrical input or optical input for a light source, a light source1, which is implemented as a light conductor, an aperture or element4that comprises in the centre thereof an opening for the passage of light and comprises a non-light transmissive frame, a film3with alternating light transmissive and non-light transmissive structures, i.e. a pattern that acts as a mask for the passage of light, and an at least partly light transmissive lens2forming the boundary and front housing component of the turn signal unit.

In the embodiment ofFIG. 1, the film3is clamped between the flange surfaces6of the aperture or element4on the one hand and the lens2on the other hand and can thus in particular be simply removed from the turn signal unit following removal of the lens2and replaced.

FIG. 2andFIG. 3show further possibilities for the arrangement and clamping of the film3in a turn signal unit in sectional representations.

Here inFIG. 2the film3is directly clamped between the lens2and the housing floor5. In addition to mutually parallel flange surfaces6, in said embodiment spring elements7are formed on the lens2to clamp the film3.

The version of a turn signal unit represented inFIG. 3comprises an aperture or element4. The film3is clamped here by means of groove and spring elements8,7of the aperture or element4and housing floor5.

Of course, the film3can also be clamped by a plurality of elements, in particular by the interaction of the lens2, aperture or element4and housing floor5.

REFERENCE CHARACTER LIST