Head-up display device

1 . A head-up display device comprising:

a display unit that emits display light;

a first mirror that reflects the display light from the display unit;

a second mirror that reflects the display light reflected at the first mirror;

a mirror holder that supports the first mirror; and

a mirror driving unit that rotates the mirror holder together with the first mirror around a rotation axis,

wherein the mirror holder includes a light shielding wall portion that is formed between a light path through which the display light passes and the mirror driving unit in the head-up display device and hides the mirror driving unit from the light path, and

wherein the first mirror, the light shielding wall portion, and the mirror driving unit are arranged along the rotation axis such that the first mirror is located on a first side of the light shielding wall portion and the mirror driving unit is located on a second side of the light shielding wall portion, the second side being opposite the first side.

2 . The head-up display device according to claim 1 , further comprising:

a shaft support portion,

wherein the mirror holder further includes a shaft portion rotatably supported by the shaft support portion and located at an end portion of the first mirror in the direction along the rotation axis,

wherein a spherical portion is formed in one of the shaft portion and the shaft support portion, and

wherein a receiving hole that the spherical portion enters is formed in the other of the shaft portion and the shaft support portion.

3 . The head-up display device according to claim 1 ,

wherein the first mirror is a concave mirror, and

wherein a width of the first mirror in the direction along the rotation axis is smaller than a width of the second mirror in the direction along the rotation axis.

4 . The head-up display device according to claim 3 ,

wherein the first mirror is positioned to face a portion of the second mirror, and

wherein the mirror driving unit is positioned to face a rest portion of the second mirror.

5 . The head-up display device according to claim 1 ,

wherein the light shielding wall portion includes a first plate portion extending along a light emission direction of the display light reflected at the first mirror.

6 . The head-up display device according to claim 5 ,

wherein the first mirror is a concave mirror concavely curved in the direction along the rotation axis, and

wherein the first plate portion also extends along a light expansion direction of the display light reflected at the first mirror.

7 . The head-up display device according to claim 5 ,

wherein the mirror holder includes a shaft portion located in an end portion of the mirror holder along the rotation axis, and

wherein the light shielding wall portion includes a second plate portion surrounding the shaft portion from above and formed on a back surface of the first plate portion at a side opposite to the light path.

8 . The head-up display device according to claim 1 ,

wherein the mirror holder includes a gripped portion configured to be gripped by the mirror driving unit, and

wherein the light shielding wall portion includes a third plate portion formed to hide the gripped portion from the light path and extending in a direction intersecting with a width direction of the first mirror.