US 12,474,548 B2
Optical lens assembly and a head-mounted electronic device
Po-Yu Chen, Taichung (TW); Ping-Yi Chen, Taichung (TW); and Fei-Hsin Tsai, Taichung (TW)
Filed by NEWMAX TECHNOLOGY CO., LTD., Taichung (TW)
Filed on Aug. 22, 2022, as Appl. No. 17/892,929.
Claims priority of application No. 111204209 (TW), filed on Apr. 22, 2022; and application No. 111122243 (TW), filed on Jun. 15, 2022.
Prior Publication US 2023/0341659 A1, Oct. 26, 2023
Int. Cl. G02B 13/00 (2006.01); G02B 9/04 (2006.01); G06F 1/16 (2006.01); G02B 5/30 (2006.01)
CPC G02B 13/003 (2013.01) [G02B 9/04 (2013.01); G06F 1/163 (2013.01); G02B 5/3025 (2013.01); G02B 5/3083 (2013.01); G02B 13/009 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical lens assembly comprising three groups comprising, in order from a visual side to an image source side:
a first group including:
a first lens group including one, two, or three lenses, and a visual-side surface of the lens of the first lens group which is closest to the visual side, being convex in a paraxial region thereof; and
an optical element including, in order from the visual side to the image source side: an absorptive polarizer, a reflective polarizer and a first phase retarder;
a second group including, in order from the visual side to the image source side:
a second lens group with positive refractive power, including one, two, or three lenses, and an image source-side surface of the lens of the second lens group which is closest to the image source side, being convex in a paraxial region thereof; and
a partial-reflective-partial-transmissive element; and
a third group including, in order from the visual side to the image source side: a second phase retarder and an image source plane;
wherein a focal length of the first lens group is f_G1, a focal length of the second lens group is f_G2, a focal length of the optical lens assembly focusing at a near point is EFL_N, a focal length of the optical lens assembly focusing at a far point is EFL_F, a distance from the visual-side surface of the lens of the first lens group which is closest to the visual side, to the image source plane along an optical axis is TL, a maximum image-source height of the optical lens assembly is IMH, and following conditions are satisfied: −0.48<f_G2/f_G1<2.15 and 0.51<EFL_N*TL/(EFL_F*IMH)<1.56.