Virtual image display apparatus
Provided is a virtual image display apparatus including a display device configured to emit an imaging light; a first mirror configured to reflect the imaging light from the display device; a refractive reflective optical member including a mirror portion configured to reflect the imaging light reflected by the first mirror; and a second mirror configured to reflect the imaging light reflected by the mirror portion toward a position of an exit pupil, wherein a distance from the display device to the first mirror is shorter than a distance from the position of the exit pupil to the second mirror; and a first angle θ formed by the imaging light incident on the second mirror and the imaging light reflected by the second mirror is greater than 0 ° and 45 ° or less.
1 . A virtual image display apparatus comprising:
an imaging light emitting unit that emits an imaging light;
a first mirror that reflects the imaging light from the imaging light emitting unit;
an optical member that includes a reflecting portion reflecting the imaging light reflected by the first mirror; and
a second mirror that reflects the imaging light reflected by the reflecting portion toward a position of an exit pupil, wherein
a distance from the imaging light emitting unit to the first mirror is shorter than a distance from the position of the exit pupil to the second mirror; and
a first angle between the imaging light incident on the second mirror and the imaging light reflected by the second mirror is greater than 0° and 45° or less,
the optical member includes an incidence-emission portion where the imaging light from the first mirror is incident and where the imaging light reflected by the reflecting portion is emitted; and
the incidence-emission portion is configured to refract the imaging light incident and the imaging light emitted,
the incidence-emission portion is an aspheric surface or a free curved surface.
2 . The virtual image display apparatus according to claim 1 , wherein
a distance C from the position of the exit pupil to the second mirror is represented by a following formula:
C
=
y
+
z
*
tan
(
θ
+
α
)
cos
(
α
)
*
tan
(
θ
+
α
)
-
sin
(
α
)
where
y is a distance in a vertical direction from the position of the exit pupil to a position of the optical member when a user normally wears the virtual image display apparatus,
z is a distance in a horizontal direction from the position of the exit pupil to the position of the optical member when the user normally wears the virtual image display apparatus,
α is an inclination angle of a line-of-sight of the user with respect to the horizontal direction, and
θ is the first angle.
3 . The virtual image display apparatus according to claim 1 , wherein the first angle is 30° or less.
4 . The virtual image display apparatus according to claim 1 , wherein the first angle is in a range from 35° to 40°; and
in an image according to the imaging light, distortion occurring in a direction corresponding to light guiding of the imaging light by the first mirror, the optical member, and the second mirror is larger than distortion occurring in a direction different to the direction.
5 . The virtual image display apparatus according to claim 1 , wherein
the first angle is smaller than a second angle formed by the imaging light incident on the first mirror and the imaging light reflected by the first mirror.
6 . The virtual image display apparatus according to claim 1 , wherein
the first mirror, the second mirror, and the reflecting portion are each an aspheric surface or a free curved surface.
7 . The virtual image display apparatus according to claim 1 , wherein
the second mirror reflects a portion of the imaging light toward the position of the exit pupil and transmits another portion of the imaging light.