US 12,253,677 B2
Retinal projection device and near eye wearable device
Tomohito Mizuno, Tokyo (JP); Hideaki Fukuzawa, Tokyo (JP); and Kit Chu Lam, Shanghai (CN)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Dec. 26, 2023, as Appl. No. 18/395,876.
Claims priority of application No. 2022-211779 (JP), filed on Dec. 28, 2022.
Prior Publication US 2024/0219723 A1, Jul. 4, 2024
Int. Cl. G02B 27/01 (2006.01); G02B 27/00 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 27/0093 (2013.01); G02B 27/0179 (2013.01); G02B 2027/0178 (2013.01); G02B 2027/0187 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A retinal projection device to be mounted on a near eye wearable device, the retinal projection device comprising:
a projector module including a light source configured to emit laser light and a movable mirror configured to perform scanning with the laser light;
a reflector configured to project an image onto a retina of a user wearing the near eye wearable device by reflecting the laser light having passed through the movable mirror and irradiating the retina with reflected light; and
a controller configured to determine an irradiation range of the reflector to be irradiated with the laser light in accordance with a position of a pupil of the user and to control the projector module to irradiate the irradiation range with the laser light, wherein
the reflector includes a plurality of unit regions provided along a surface of a lens of the near eye wearable device, and the surface faces an eyeball of the user,
each of the plurality of unit regions is a nanostructure configured to reflect the laser light at a reflection angle corresponding to a position where the unit region is provided when the laser light having passed through the movable mirror is incident on the unit region,
the irradiation range is a part of the plurality of unit regions,
the controller determines a first irradiation range as the irradiation range when the pupil is located at a first position, and determines a second irradiation range as the irradiation range when the pupil is located at a second position different from the first position, and
the first irradiation range partially overlaps the second irradiation range.