Patent ID: 11966058
Assignee: BEIJING NED+AR DISPLAY TECHNOLOGY CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An ultra-thin lens, comprising a primary lens, an intermediate lens, and a secondary lens, wherein
the primary lens comprises at least three effective optical surfaces, wherein a first optical surface is an incident surface, a second optical surface is a surface adjacent to a human eye side, and a third optical surface is a surface adjacent to an environmental side; and the primary lens receives image light from a micro-display panel that is transmitted into the primary lens with the first optical surface as an incident surface, propagates in a direction of the third optical surface, and then undergoes total reflection at the third optical surface and the second optical surface in sequence, and the image light after total reflection by the second optical surface is transmitted from the primary lens through the third optical surface and directed to the intermediate lens;
the intermediate lens comprises two effective optical surfaces: a fourth optical surface and a fifth optical surface; and the fourth optical surface is provided adjacent to the third optical surface and has a predetermined gap therewith, the image light directed to the intermediate lens is transmitted into the intermediate lens through the fourth optical surface, and part of the image light is reflected by the fifth optical surface back to the intermediate lens, and then transmitted through the fourth optical surface, the third optical surface, and the second optical surface in sequence, to the human eye for imaging;
the secondary lens is provided adjacent to the fifth optical surface, and environmental light is imaged to the human eye through the secondary lens, the intermediate lens, and the primary lens; and
at least a surface of the primary lens and a surface of the secondary lens form a first outer surface of the ultra-thin lens toward an exit pupil side, and a surface of the primary lens, a surface of the intermediate lens, and a surface of the secondary lens jointly form a second outer surface of the ultra-thin lens toward the environmental side.