Virtual image optical system, and virtual image display device and on-vehicle system including virtual image optical system
A virtual image optical system includes first and second optical elements and each configured to guide light from a display unit, wherein the second optical element guides the light from the display unit to a first pupil to form a first virtual image, and the second optical element simultaneously guides the light from the display unit to a second pupil to form a second virtual image, and wherein decentering of the second optical element enables switching of positions of the first pupil and the second pupil to each other.
1 . A virtual image display device comprising:
a display unit; and
first and second optical elements each configured to guide light from the display unit,
wherein the second optical element guides the light from the display unit to a first pupil to form a first virtual image, and the second optical element simultaneously guides the light from the display unit to a second pupil to form a second virtual image,
wherein switching between a first state and a second state is enabled by physically moving the second optical element to cause decentering, wherein the second optical element is a reflective element or a refractive element,
wherein, in the first state, a user is able to visually recognize the first virtual image, and is unable to visually recognize the second virtual image, and
wherein, in the second state, the user is able to visually recognize the second virtual image, and is unable to visually recognize the first virtual image.
2 . The virtual image display device according to claim 1 , wherein the decentering of the second optical element enables the positions of the first pupil and the second pupil to be moved in a direction including a component of a direction perpendicular to a reference axis.
3 . The virtual image display device according to claim 1 , wherein the decentering of the second optical element enables a reflection angle of the light from the display unit with respect to the second optical element to be changed.
4 . The virtual image display device according to claim 1 , wherein a distance from the first pupil to the first virtual image is longer than a distance from the second pupil to the second virtual image.
5 . The virtual image display device according to claim 1 , wherein the first virtual image is non-perpendicular to a straight line connecting a center of the first pupil and a center of the first virtual image.
6 . The virtual image display device according to claim 1 , wherein the first optical element and the second optical element guide the light from the display unit to the first pupil to form the first virtual image, and the second optical element guides the light from the display unit to the second pupil without using the first optical element to form the second virtual image.
7 . The virtual image display device according to claim 1 , further comprising a actuator configured to cause the second optical element to be decentered.
8 . The virtual image display device according to claim 7 , wherein the actuator causes the second optical element to be decentered to adjust at least one of a relative position between the first pupil and a user's eye and a relative position between the second pupil and the user's eye.
9 . The virtual image display device according to claim 7 , wherein the actuator causes the second optical element to be decentered based on at least one of positional information and viewpoint information about the user.
10 . An on-vehicle system comprising:
the virtual image display device according to claim 1 ,
wherein the on-vehicle system is held by a movable apparatus.
11 . The on-vehicle system according to claim 10 , further comprising:
a first obtaining unit configured to obtain at least one of the positional information and the viewpoint information about the user,
wherein the actuator causes the second optical element to be decentered based on the information obtained by the first obtaining unit.
12 . The on-vehicle system according to claim 10 , wherein the actuator causes the second optical element to be decentered based on information about a moving speed of the movable apparatus.
13 . The on-vehicle system according to claim 12 ,
wherein a distance from the first pupil to the first virtual image is longer than a distance from the second pupil to the second virtual image, and
wherein the actuator causes the second optical element to be decentered so that, in a case where the movable apparatus is moving at a first speed, the user is able to visually recognize the first virtual image and, in a case where the movable apparatus is moving at a second speed higher than the first speed, the user is able to visually recognize the second virtual image.
14 . The on-vehicle system according to claim 10 , further comprising a second obtaining unit configured to obtain information about an outside world.
15 . The on-vehicle system according to claim 14 , further comprising a determination unit configured to determine a possibility of collision between the movable apparatus and an object based on the information obtained by the second obtaining unit.
16 . The on-vehicle system according to claim 15 , wherein, in a case where the determination unit determines that there is a possibility of collision between the movable apparatus and the object, the virtual image display device issues a warning to the user.
17 . A movable apparatus comprising:
the virtual image display device according to claim 1 ,
wherein the movable apparatus is configured to move while holding the virtual image display device.
18 . The movable apparatus according to claim 17 , further comprising an optical member configured to reflect light from the virtual image display device toward a user.
19 . The virtual image display device according to claim 1 , wherein decentering of the second optical element enables switching between the first state and the second state is enabled by tilting or shifting the second optical element to cause decentering.