US 10,890,696 B2
Ocular optical system
Chun-Yang Huang, Taichung (TW); and Wan-Chun Chen, Taichung (TW)
Assigned to GENIUS ELECTRONIC OPTICAL CO., LTD., Taichung (TW)
Filed by GENIUS ELECTRONIC OPTICAL (XIAMEN) CO., LTD., Fujian (CN)
Filed on Dec. 3, 2019, as Appl. No. 16/701,160.
Application 16/701,160 is a continuation of application No. 16/255,838, filed on Jan. 24, 2019, granted, now 10,527,763.
Application 16/255,838 is a continuation of application No. 15/813,169, filed on Nov. 15, 2017, granted, now 10,234,604, issued on Mar. 19, 2019.
Claims priority of application No. 2017 1 0954299 (CN), filed on Oct. 13, 2017.
Prior Publication US 2020/0166675 A1, May 28, 2020
Int. Cl. G02B 3/08 (2006.01); G02B 27/01 (2006.01)
CPC G02B 3/08 (2013.01) [G02B 27/0172 (2013.01); G02B 27/0101 (2013.01); G02B 2027/012 (2013.01); G02B 2027/015 (2013.01); G02B 2027/0152 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An ocular optical system, configured to allow imaging rays from a display frame to enter an eye of an observer through the ocular optical system to form an image, wherein a side toward the eye is an eye side, and a side toward the display frame is a display side, the ocular lens system comprises a lens element having an eye-side surface that is toward the eye side and allows imaging rays to pass through and a display-side surface that is toward the display side and allows the imaging rays to pass through;
wherein the lens element has an optical axis extending from the display side toward the eye side, the display-side surface of the lens element adopts a Fresnel lens design, and the ocular optical system satisfies:
4.317≤EFL/T1≤12.463,
wherein EFL represents an effective focal length of the ocular optical system, and T1 represents a thickness of the lens element on the optical axis, and
wherein the ocular optical system comprises only one lens element having refracting power.