US 11,994,667 B1
Eyepiece optical assembly, system and device
Huajun Peng, Shenzhen (CN); Hongpeng Cao, Shenzhen (CN); and Jianfei Guo, Shenzhen (CN)
Assigned to Shenzhen NED Optics Co., Ltd, Shenzhen (CN)
Filed by Shenzhen NED Optics Co., Ltd, Shenzhen (CN)
Filed on Feb. 6, 2024, as Appl. No. 18/434,086.
Claims priority of application No. 202310122818.X (CN), filed on Feb. 16, 2023.
Int. Cl. G02B 25/00 (2006.01)
CPC G02B 25/001 (2013.01) 14 Claims
OG exemplary drawing
 
1. An eyepiece optical assembly, comprising a first optics group, a second optics group and a third optics group arranged in sequence along an optical axis from a human eye viewing side to a miniature display;
the first optics group consists of a first lens group, a first polarizer group and a first waveplate group, the first lens group consists of a first lens and a second lens, the first lens, the first polarizer group, the second lens and the first waveplate group are arranged in sequence, the second optics group consists of a second lens group and a transflective optical surface arranged in sequence, and the third optics group consists of a third lens group, a second waveplate group and a second polarizer group; and both the second lens group and the third lens group are positive lens groups;
an optical focal length of the eyepiece optical assembly is F, a length from a first optical surface of the eyepiece optical assembly to the miniature display is D, a combined optical focal length of the first optics group and the second optics group is F12, a combined center thickness of the first optics group and the second optics group is D1, an optical focal length of the third optics group is F3, and a center thickness of the third optics group is D2;
F, F12, D1, F3, and D2 satisfy the following relations:
1.1≤F12/F≤1.8;
1.13≤F3/F≤1.98;
0.56≤F12/F3≤1.59;
0.47≤D1/D≤0.73;
0.2≤D2/D≤0.53;
0.28≤D1/D2≤1.12;
the first polarizer group includes a polarizer a in which light of one polarization state of P light and S light of natural light is reflected and light of the other polarization state transmits, and includes N polarizers bN in which light of one polarization state of P light and S light of natural light is absorbed and light of the other polarization state transmits, wherein N is a natural number;
the first waveplate group includes K waveplates cK with a quarter phase retardation for polarized light, and includes J waveplates dJ with a half phase retardation for polarized light, wherein K is a positive integer greater than or equal to 1, and J is a natural number;
the second waveplate group includes Z waveplates eZ with a quarter phase retardation for polarized light, and includes Y waveplates fY with a half phase retardation for polarized light, wherein Z is a positive integer greater than or equal to 1, and Y is a natural number;
the second polarizer group includes M polarizers gM in which light of one polarization state of P light and S light of natural light is absorbed and light of the other polarization state transmits, and includes X waveplates hX with a half phase retardation for polarized light, wherein M is a positive integer greater than or equal to 1, X is a natural number, and M is a positive integer greater than or equal to 1.