Head-up display with an adjusting device for a mirror

The invention relates to a head-up display comprising an adjustment device for a mirror, in particular for motor vehicles.

A head-up display is known from the prior art, in which light from an imaging device can be projected onto a projection surface via at least one mirror, the at least one mirror. rotatable about a first axis of rotation by means of an adjusting device, and thus the position of an image projected on the projection surface can be varied. It is known from the prior art that such mirrors are adjusted through manual adjustment devices or through electromechanical adjustment devices of complex design. The total space required and the high financial expenditure are unfavorable in this case.

Thus, an object of the invention is to specify an adjustment device for head-up display which is of simple design and which can be produced cost-effectively and which further requires a small overall space.

This object is achieved by virtue of the fact that the adjustment device has an inclined segment which is mounted in a manner permitting rotation about a second axis of rotation, the at least one mirror being connected to a support unit which is arranged with a spacing from the first axis of rotation. Further, the support unit is pressed against the inclined segment in terms of spacing from the first axis of rotation. By rotating the inclined segment about the second axis of rotation, the support surface slides over the inclined segment so that the mirror is rotated about the first axis of rotation. The position of the projected image on a projection surface is varied in this way.

The invention can also be implemented by virtue of the fact that the support surface is rotated instead of the inclined segment. Such a design is described below in connection with a second aspect of the invention.

By virtue of the fact that at least two inclined segments are present on which in each case at least one support surface slides, the inclination forces on the torsion shaft of the inclined segments are minimized. The situation is the same when the support surfaces are rotated instead of the inclined segments.

A plurality of inclined segments can be implemented in the form of a cam in a particularly simple manner. The mechanical design and electronic driver of the adjuster are particularly simple in configuration when a stepping motor is provided as a driving device for the rotations about the second axis of rotation of the jets. inclined segments or support surfaces. It is thus possible in certain circumstances that the position is established very precisely without additional position sensors even in the absence of gearing.

According to a first aspect of the present invention, there is provided a head-up display in which light from an imaging device can be projected onto a projection surface through at least one mirror, and the at least one mirror can be rotated about a first axis of rotation by means of an adjustment device, and thus the position of an image which can be projected on the projection surface can be varied , characterized in that the adjustment device comprises at least one inclined segment which is mounted in a manner permitting rotation about a second axis of rotation, the second axis of rotation not being perpendicular to the surface of the at least an inclined segment, in that the at least one mirror is connected to a support unit, in that the support unit is pressed against the inclined segment at a spacing from the second axis of rotation, and in that, by rotating the at least one inclined segment, the support unit slides over the inclined segment, and the mirror is thus rotated about the first axis of rotation.

Preferably, at least two inclined segments are designed as an axial cam, and at least one support surface slides in each case on each inclined segment. In particular, the support surfaces are designed as pins.

According to a second aspect of the present invention, there is provided a head-up display in which light from an imaging device can be projected through at least one mirror onto a projection surface, and the at least one mirror can be rotated by means of an adjustment device about a first axis of rotation, and thus the position of an image which can be projected on the projection surface can be varied , characterized in that the at least one mirror is connected to a segment inclined at a spacing from the first axis of rotation, in that a supporting surface is present which bears against the inclined segment at the spacing along a way allowing rotation around a second axis of rotation, the inclined segment not being arranged perpendicular to the second axis of rotation, so that due to a rotation of the support surface about the second axis of rotation, the support surface slides on the inclined segment and the mirror is thus rotated about the first axis of rotation.

Preferably, at least two inclined segments are present, against which in each case bears at least one support surface.

In particular, the drive device for the rotation about the second axis of rotation comprises a stepping motor.

The invention is explained in more detail below with the aid of the illustrated figures, in which:

FIG. 1 represents a mirror of a head-up display comprising a particularly preferred adjustment device in accordance with the invention,

Figure 2 shows a particularly preferred axial cam cooperating with a pair of pins,

FIG. 3 represents the partial view of a vehicle comprising a head-up display and an adjustable mirror in accordance with FIGS. 1 and 2,

Figure 4 shows a modification of the adjustment device compared to Figure 1.

A mirror 1 is connected to a pair of pins 2 in FIG. 1. The mirror 1 is mounted in a manner allowing rotation about a first axis of rotation 3. Note also the presence of a spring 4, inclined segments 5, 6 of an axial cam 7, and of a stepping motor 8. The spring 4 presses against the mirror 1. As a result, the pair of pins 2 is pressed against the inclined segments 5, 6 of the axial cam 7. The stepping motor 8 and the axial cam 7 are mounted in a manner permitting rotation about a second axis of rotation 9. As soon as the stepping motor 8 rotates the axial cam 7 around. of the axis of rotation 9, the pair of pins 2 slide on the inclined segments 5, 6 of the axial cam 7. As a result, the pair of pins 2 is moved axially in the direction of the second axis of rotation 9, and thus the mirror 1 is rotated around the first axis of rotation 3. The axial cam 7 should be seen in Fig. 2a. cooperating with the pair of pins 2. The pair of pins 2 comprises the pins 2a, 2b which in each case bear against an inclined segment 5, 6. The inclined segments 5, 6 respectively cover 180 ° of an axis of rotation, the slopes of the two segments being the same, but offset by 180 °. The view of the axial cam 7 in direction b is illustrated in Figure 2b, while the view of the axial cam 7 in direction c is correspondingly illustrated in Figure 2c. Two or more angled segments on the axial cam prevent tilt forces, which would otherwise load the motor shaft in the case of a single spindle. In the present exemplary embodiment, the surfaces of the inclined segments are shown as flat surfaces, and are therefore particularly easy to manufacture. However, it is also possible that the surface is of a different configuration, for example in the form of a worm.

An example of a complete head-up display in a motor vehicle incorporating the adjustment device according to the invention is to be seen in figure 3. An image forming device 10, a fixed mirror 11, a visor. breeze WS of a motor vehicle and an eye A of a user of the motor vehicle are visible in addition to the elements already described. An image is formed in the image forming device 10. This can be formed, for example, by a backlit liquid crystal display, or by an array of light emitting diodes. The image formed in the image forming device 10 is projected through the mirrors 11 and 1 on the windshield in the projection region 12 so that the eye A perceives an image behind the windshield . The projection region 12 can be moved by rotating the mirror 1 around the first axis of rotation 3.

FIG. 4 represents a kinematic inversion with respect to the embodiment of FIG. 1. An axial cam 7A comprising inclined segments 5A,

6A is connected to a mirror 1, while a pair of pins 2A are mounted in a manner allowing rotation about the second axis of rotation 9. The inclined segments 5A, 6A are pressed against the pair of pins 2A. The axial cam 7A is moved in the axial direction of the second axis of rotation 9 by rotating the pair of pins 2A around the second axis of rotation 9.