US 12,135,428 B2
Optical device, image display device, and display device
Ryo Kasegawa, Tokyo (JP)
Assigned to Sony Group Corporation, Tokyo (JP)
Appl. No. 17/421,756
Filed by SONY GROUP CORPORATION, Tokyo (JP)
PCT Filed Dec. 10, 2019, PCT No. PCT/JP2019/048256
§ 371(c)(1), (2) Date Jul. 9, 2021,
PCT Pub. No. WO2020/149053, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 2019-005135 (JP), filed on Jan. 16, 2019.
Prior Publication US 2022/0091421 A1, Mar. 24, 2022
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 6/0076 (2013.01); G02B 2027/0178 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical device in which a light emitted from an image formation device is incident, guided, and emitted, the optical device comprising:
a first light guide plate;
a second light guide plate;
a first deflection unit provided on the first light guide plate; and
a second deflection unit provided on the second light guide plate,
wherein the first light guide plate is disposed in a first plane,
wherein the second light guide plate is disposed in a second plane,
wherein the first plane is parallel to the second plane,
wherein the first light guide plate is spaced apart from the second light guide plate,
wherein the first deflection unit includes a first A deflection member, a first B deflection member, and a first C deflection member,
wherein the second deflection unit includes a second A deflection member, a second B deflection member, and a second C deflection member,
wherein a part of the light emitted from the image formation device is incident on the first A deflection member,
wherein a light incident on the first A deflection member is deflected by the first A deflection member, totally reflected inside the first light guide plate and incident on the first B deflection member, deflected by the first B deflection member, totally reflected inside the first light guide plate and incident on the first C deflection member, deflected by the first C deflection member, and emitted toward a pupil of an observer,
wherein at least a rest of the light emitted from the image formation device is incident on the second A deflection member,
wherein a light incident on the second A deflection member is deflected by the second A deflection member, totally reflected inside the second light guide plate, incident on the second B deflection member, deflected by the second B deflection member, totally reflected inside the second light guide plate, incident on the second C deflection member, deflected by the second C deflection member, and emitted toward the pupil of the observer, and
wherein, when a direction in which a propagation direction of a light deflected by the first B deflection member in the first light guide plate is orthogonally projected onto the first light guide plate is a first direction, and a direction in which a propagation direction of a light deflected by the second B deflection member in the second light guide plate is orthogonally projected onto the first light guide plate is a second direction, the first direction is opposite to the second direction.