effective focal length
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2020 ◽  
Vol 10 (21) ◽  
pp. 7931
Author(s):  
So Hyun Seo ◽  
Jae Myung Ryu ◽  
Hojong Choi

An off-axis system refers to an optical system in which the optical axis and the normal vector at the vertex of each surface do not match. An off-axis optical system can be applied in order to construct a thin and light optical system. In particular, the optical system used for a see-through head-mounted display (HMD) must be designed asymmetrically, with respect to the optical axis. Because the vision of a human is different for each individual, HMD requires focus adjustment. The effective focal length (EFL) of the optical system must be calculated to obtain the focus adjustment. However, the off-axis optical system cannot be calculated by conventional methods. In this study, the EFL was calculated by rotating the coordinates of the rays near the optical axis by the angle of reflection or refraction at the intersection of each surface, with the rays coinciding with the optical axis. The magnitude of movement of the micro-display for focus adjustment was obtained from the calculated EFL, for a see-through type HMD.





2018 ◽  
Vol 172 ◽  
pp. 86-93 ◽  
Author(s):  
Pengfei Zhang ◽  
Jacopo Mocci ◽  
Daniel J. Wahl ◽  
Ratheesh Kumar Meleppat ◽  
Suman K. Manna ◽  
...  


Laser Physics ◽  
2017 ◽  
Vol 27 (10) ◽  
pp. 106201 ◽  
Author(s):  
S Leghmizi ◽  
A Hasnaoui ◽  
B Boubaha ◽  
A Aissani ◽  
K Ait-Ameur




Optik ◽  
2015 ◽  
Vol 126 (19) ◽  
pp. 1965-1969
Author(s):  
Julián Espinosa ◽  
Jorge Pérez ◽  
Consuelo Hernández ◽  
David Mas ◽  
Carmen Vázquez


2014 ◽  
Vol 7 (2) ◽  
pp. 293-300
Author(s):  
李刚 LI Gang ◽  
杨晓许 YANG Xiao-xu ◽  
张恒金 ZHANG Heng-jin ◽  
孙东岩 SUN Dong-yan


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