Image display device
An image display device includes: an imaging element; a light source configured to irradiate light toward the imaging element; an optical system located in an optical path between the imaging element and the light source; a light-shielding member configured to shield a portion of light of at least the light source; and a light-transmitting member configured to transmit light emitted from the imaging element.
1 . An image display device comprising:
an imaging element;
a light source configured to irradiate light toward the imaging element;
an optical system located in an optical path between the imaging element and the light source;
a light-shielding member configured to shield a portion of light of at least the light source; and
a light-transmitting member configured to transmit light emitted from the imaging element; wherein:
the imaging element comprises either:
a base member, and a reflector array provided on the base member, the base member including a first surface and a second surface positioned at a side opposite to the first surface, or
a base member comprising a reflector array, the base member including a first surface and a second surface positioned at a side opposite to the first surface;
the reflector array includes a plurality of reflector rows, the plurality of reflector rows including a plurality of dihedral corner reflectors arranged along a first direction;
each of the plurality of dihedral corner reflectors includes:
a first reflecting surface configured to reflect light from a first surface side, and
a second reflecting surface orthogonal to the first reflecting surface and configured to reflect a reflected light from the first reflecting surface toward the first surface side;
in each of the plurality of reflector rows, an angle between (i) a straight line at which the first reflecting surface and the second reflecting surface meet, and (ii) a plane in which the first direction and a second direction intersecting the first direction extend, is set to a value greater than 0° and less than 90°;
an angle between the first reflecting surface and the plane is greater than 45° and less than 90°;
the plurality of reflector rows include a first reflector row in which the angle between the straight line and the plane is set to a smallest value among those of the plurality of reflector rows;
the reflector rows other than the first reflector row are configured such that the angle between the straight line and the plane is set to values that increase away from the first reflector row in the second direction;
the light source is located at the first surface side;
each of the plurality of dihedral corner reflectors is configured to cause a portion of once-reflected light to travel toward the second reflecting surface, the once-reflected light being light that is emitted from the light source and reflected at the first reflecting surface,
the light-transmitting member is configured to transmit twice-reflected light, the twice-reflected light being a portion of the once-reflected light that is reflected at the second reflecting surface,
the light-shielding member is configured to shield at least a portion of light other than the twice-reflected light.
2 . The image display device according to claim 1 , wherein:
the optical system comprises a plurality of optical elements.
3 . The image display device according to claim 2 , wherein
the plurality of optical elements comprise a freeform mirror.
4 . The image display device according to claim 1 , further comprising:
a control mechanism configured to adjustably set optical axes of the light source and the optical system, and to adjustably set positions of the light source and the optical system in respective directions along the optical axes.
5 . The image display device according to claim 1 , wherein:
the light-shielding member is a portion of a housing provided around the light source and the imaging element, and
the light-transmitting member is another portion of the housing.
6 . The image display device according to claim 1 , further comprising:
a housing located around the light source and the imaging element; wherein:
the light-transmitting member is located at a portion of the housing; and
the light-shielding member is located between the light source and the light-transmitting member.
7 . The image display device according to claim 1 , wherein:
the light source is a display device comprising:
a substrate, and
a plurality of semiconductor light-emitting elements located on the substrate.
8 . The image display device according to claim 7 , wherein:
the display device comprises lenses, each located at a respective one of the plurality of semiconductor elements.
9 . The image display device according to claim 7 , wherein:
the display device comprises a light-scattering member located on the plurality of semiconductor light-emitting elements.
10 . The image display device according to claim 7 , wherein:
the substrate includes a concave surface that is concave toward an emission direction of light; and
the plurality of semiconductor light-emitting elements are located on the concave surface.
11 . The image display device according to claim 7 , wherein:
the substrate is flexible.
12 . An image display device comprising:
an imaging element;
a light source configured to irradiate light toward the imaging element;
an optical system located in an optical path between the imaging element and the light source;
a light-shielding member configured to shield a portion of light of at least the light source; and
a light-transmitting member configured to transmit light emitted from the imaging element; wherein:
the imaging element comprises either:
a base member and a reflector array provided on the base member, the base member including a first surface and a second surface positioned at a side opposite to the first surface, or
a base member comprising a reflector array provided in a base member, the base member including a first surface and a second surface positioned at a side opposite to the first surface;
the reflector array includes a plurality of reflector rows, the plurality of reflector rows including a plurality of dihedral corner reflectors arranged along a first direction;
the plurality of reflector rows are arranged in a second direction to be parallel to each other with a spacing therebetween, the second direction intersecting the first direction;
each of the plurality of dihedral corner reflectors includes:
a first reflecting surface configured to reflect light from a first surface side, and
a second reflecting surface orthogonal to the first reflecting surface and configured to reflect a reflected light reflected from the first reflecting surface toward the first surface side;
in each of the plurality of reflector rows, an angle between (i) a straight line at which the first reflecting surface and the second reflecting surface meet, and (ii) a plane in which the first direction and the second direction intersect, is set to a value greater than 0° and less than 90°;
an angle between the first reflecting surface and the plane is greater than 45° and less than 90°;
the plurality of reflector rows include a first reflector row in which the angle between the straight line and the plane is set to a smallest value among those of the plurality of reflector rows;
the reflector rows other than the first reflector row are configured such that the angle between the straight line and the plane is set to values that increase away from the first reflector row in one direction along the second direction;
the light source is located at the first surface side;
each of the plurality of dihedral corner reflectors is configured such that a first portion of once-reflected light travels toward the second reflecting surface, and a second portion of the once-reflected light travels toward a second surface side, the once-reflected light being light that is emitted from the light source and reflected at the first reflecting surface;
the light-transmitting member is configured to transmit twice-reflected light, the twice-reflected light being a portion of the once-reflected light that is reflected at the second reflecting surface; and
the light-shielding member is configured to shield at least a portion of light other than the twice-reflected light.
13 . The image display device according to claim 12 , wherein:
the optical system comprises a plurality of optical elements.
14 . The image display device according to claim 13 , wherein:
the plurality of optical elements comprise a freeform mirror.
15 . The image display device according to claim 12 , further comprising:
a control mechanism configured to adjustably set optical axes of the light source and the optical system, and to adjustably set positions of the light source and the optical system in respective directions along the optical axes.
16 . The image display device according to claim 12 , wherein:
the light-shielding member is a portion of a housing provided around the light source and the imaging element, and
the light-transmitting member is another portion of the housing.
17 . The image display device according to claim 12 , further comprising:
a housing located around the light source and the imaging element; wherein:
the light-transmitting member is located at a portion of the housing; and
the light-shielding member is located between the light source and the light-transmitting member.
18 . The image display device according to claim 12 , wherein:
the light source is a display device including:
a substrate, and
a plurality of semiconductor light-emitting elements located on the substrate.
19 . The image display device according to claim 18 , wherein:
the display device comprises lenses, each located at a respective one of the plurality of semiconductor elements.
20 . The image display device according to claim 18 , wherein:
the display device comprises a light-scattering member located on the plurality of semiconductor light-emitting elements.
21 . The image display device according to claim 18 , wherein:
the substrate includes a concave surface that is concave toward an emission direction of light; and
the plurality of semiconductor light-emitting elements are located on the concave surface.
22 . The image display device according to claim 18 , wherein:
the substrate is flexible.