Optical device and direction display device

1. An optical device for displaying a condensing mark, comprising:

a light source; and

an optical element for condensing a light emitted from the light source into a shape of the condensing mark on an irradiated surface,

wherein a deflection surface of the optical element is divided into a plurality of regions, the deflection surface being a surface for condensing the light, and

each of the divided regions on the deflection surface irradiates partial irradiation images formed on the irradiated surface by lights emitted through each of the divided regions,

each of the partial irradiation images formed on the irradiate surface have a linear shapes, each linear shape has a different inclination, and each linear shape is located at different positions on the irradiated surface, and

the partial irradiation images become the condensing mark when combined with the partial irradiation images.

2. The optical device according to claim 1 ,

wherein the optical element is a reflector for reflecting the light emitted from the light source, and

the deflection surface is a reflection surface of the reflector.

3. The optical device according to claim 1 ,

wherein the optical element is a lens, the lens receiving incidence of the light emitted from the light source, and emitting the light from an emission surface, and

the deflection surface is at least one of the emission surface and an incident surface of the lens.

4. A direction display device installed in a vehicle, comprising:

the optical device according to claim 1 ; and

a lamp controller for controlling lighting or blinking of the optical device,

wherein the irradiated surface is a road surface around the vehicle,

the lamp controller acquires a detection signal from a state detection device, the state detection device being mounted on the vehicle for detecting a behavior of the vehicle and peripheral environmental information of the vehicle, and

the lamp controller lights or blinks the optical device based on the detection signal.

5. The direction display device according to claim 4 ,

wherein the irradiated surface is a road surface located at least at one of a front side, a lateral side, and a rear side of the vehicle.

6. The direction display device according to claim 4 ,

wherein the lamp controller acquires an operation signal indicating a right turn or a left turn from a direction indicator installed in the vehicle, and lights or blinks the optical device based on the operation signal.

7. The direction display device according to claim 4 ,

wherein the lamp controller acquires a traveling speed of the vehicle from a vehicle speed sensor installed in the vehicle, and lights or blinks the optical device when the traveling speed is lower than a predetermined value.

8. The direction display device according to claim 4 ,

wherein the lamp controller acquires a reflectance of a road surface around the vehicle from a road surface analyzer installed in the vehicle, and makes an illuminance by the optical device to a predetermined value or smaller when the reflectance is equal to or larger than a predetermined value.

9. The direction display device according to claim 4 ,

wherein the lamp controller acquires a current position of the vehicle from a navigation device installed in the vehicle, and lights the optical device when the current position of the vehicle is in a blind spot for a driver of the other vehicle irrespective of the detection signal.

10. The direction display device according to claim 4 ,

wherein a plurality of travelling directions exist for displaying the condensing marks,

the direction display device comprises a plurality of the optical devices provided corresponding to each of the travelling directions for displaying the condensing marks, and

the lamp controller lights or blinks the optical device corresponding to the travelling direction in accordance with the detection signal.

11. The direction display device according to claim 10 ,

wherein each of the optical devices provided corresponding to each of the travelling directions for displaying the condensing marks displays the condensing marks on the display regions of the irradiated surface, each of the display regions being different in distance from the vehicle, and

the condensing mark to be displayed on the display region farthest from the vehicle is different in color from the condensing mark to be displayed on the display region closest to the vehicle.

12. The direction display device according to claim 4 ,

wherein the optical device comprises:

a forward optical device for displaying the condensing mark indicating a forward direction;

a right turn optical device for displaying the condensing mark indicating a direction of right; and

a left turn optical device for displaying the condensing mark indicating a direction of left, and

the lamp controller lights or blinks one of the forward optical device, the right turn optical device, and the left turn optical device in accordance with the detection signal.

13. The direction display device according to claim 12 ,

wherein each of the forward optical device, the right turn optical device, and the left turn optical device displays a plurality of differently colored condensing marks on different display regions of the irradiated surface.

14. The direction display device according to claim 12 ,

wherein each of the forward optical device, the right turn optical device, and the left turn optical device displays the condensing marks on a plurality of display regions of the irradiated surface, each of the display regions being different in distance from the vehicle, and

the condensing mark displayed on the farthest display region from the vehicle is different in color from the condensing mark displayed on the closest display region to the vehicle.

15. The optical device according to claim 1 , wherein the condensing mark having a shape of any one of an arrowhead shape, an arrow shape and a X-shape.

16. The optical device according to claim 1 ,

each of the divided regions on the deflection surfaces has a free-form surface shape.

17. The optical device according to claim 16 ,

wherein the free-form surface shape is a Nonuniform rational B-spline (NURBS) curved surface.