VIRTUAL IMAGE DISPLAY DEVICE

1 . A virtual image display device comprising:

a holding unit configured to detachably hold a portable terminal equipped with a display surface for displaying an image;

a combiner configured to reflect light of the image emitted from the display surface to let an observer visually recognize the image as a virtual image; and

a base unit connected to the holding unit and the combiner,

wherein the combiner and the holding unit are connected to be configured to change distance between the combiner and the holding unit.

2 . The virtual image display device according to claim 1 ,

wherein the base unit is connected to a ceiling part of a vehicle or an attachment unit configured to be attached to a sun visor on the ceiling part.

3 . The virtual image display device according to claim 2 ,

wherein the base unit includes a connecting member configured to rotatably connect the base unit to the attachment unit.

4 . The virtual image display device according to claim 2 ,

wherein the holding unit holds the portable terminal in a state that a normal line of the display surface passes above a center point of a reflection surface of the combiner.

5 . The virtual image display device according to claim 4 ,

wherein the combiner has a concave reflection surface whose curvature becomes gradually larger at a position closer to a bottom of the combiner and farther from a top of the combiner.

6 . The virtual image display device according to claim 5 ,

wherein the curvature of the reflection surface gradually varies so that image formation distance of the virtual image corresponding to the bottom of the combiner is longer than the image formation distance of the virtual image corresponding to the top of the combiner.

7 . The virtual image display device according to claim 1 ,

wherein the holding unit is rotatably connected to the base unit to be configured to direct the display surface of the portable terminal held by the holding unit to the combiner and to the observer.

8 . (canceled)

9 . The virtual image display device according to claim 1 , further comprising

a sending unit configured to send information on a type of the virtual image display device used for the portable terminal to switch a display mode of the image displayed on the display surface, and

wherein the sending unit sends the information on the type to the portable terminal at a time when distance between the holding unit and the portable terminal is equal to or shorter than a predetermined distance.

10 . The virtual image display device according to claim 1 , further comprising

a reflection unit connected to the base unit to reflect the light of the image displayed on the display surface of the portable terminal to the combiner,

wherein the holding unit holds and directs the display surface of the portable terminal to the reflection unit.

11 . The virtual image display device according to claim 10 ,

wherein the holding unit holds the display surface of the portable terminal in substantially parallel with the base unit.

12 . The virtual image display device according to claim 10 ,

wherein the holding unit is rotatably connected to the base unit to be configured to direct the display surface of the portable terminal held by the holding unit to the reflection unit and to the observer.

13 . The virtual image display device according to claim 12 ,

wherein the reflection unit is connected to the base unit to be configured to rotate in the same direction as rotational direction of the holding unit, and

wherein the holding unit rotates together with the reflection unit within a predetermined angle range of a rotatable range of the reflection unit.

14 . (canceled)

15 . The virtual image display device according to claim 1 ,

wherein on the combiner, there is provided a light shielding member configured to block out or decay natural light coming against direction in which the virtual image is visually recognized by the observer.

16 . The virtual image display device according to claim 3 ,

wherein the holding unit holds the portable terminal in a state that a normal line of the display surface passes above a center point of a reflection surface of the combiner.

17 . The virtual image display device according to claim 2 ,

wherein the holding unit is rotatably connected to the base unit to be configured to direct the display surface of the portable terminal held by the holding unit to the combiner and to the observer.

18 . The virtual image display device according to claim 3 ,

wherein the holding unit is rotatably connected to the base unit to be configured to direct the display surface of the portable terminal held by the holding unit to the combiner and to the observer.

19 . The virtual image display device according to claim 4 ,

wherein the holding unit is rotatably connected to the base unit to be configured to direct the display surface of the portable terminal held by the holding unit to the combiner and to the observer.

20 . The virtual image display device according to claim 5 ,

wherein the holding unit is rotatably connected to the base unit to be configured to direct the display surface of the portable terminal held by the holding unit to the combiner and to the observer.

21 . The virtual image display device according to claim 6 ,

wherein the holding unit is rotatably connected to the base unit to be configured to direct the display surface of the portable terminal held by the holding unit to the combiner and to the observer.

22 . The virtual image display device according to claim 2 , further comprising

a sending unit configured to send information on a type of the virtual image display device used for the portable terminal to switch a display mode of the image displayed on the display surface, and

wherein the sending unit sends the information on the type to the portable terminal at a time when distance between the holding unit and the portable terminal is equal to or shorter than a predetermined distance.