Measurement of pancake optics
The greatest challenge in the design of VR headsets is currently to achieve a very high imaging performance with a high level of wearing comfort at the same time. Thus, the weight and size of the headsets must be reduced. Therefore one focus is to reduce the thickness of the optics as well as the distance between optics and display.
The first headset models used Fresnel lenses. These have one advantage: They themselves are already very thin and light. Unfortunately, the required distance of more than 50 mm between the optics and the display is quite large. Furthermore, Fresnel lenses are very sensitive to stray light due to their edge structure.
A promising alternative approach is the use of pancake lenses. Although these are a bit thicker than Fresnel lenses, they can be positioned much closer to the display with a distance of less than 1 mm. Thus, they reduce the size of the VR lens system. At the same time, they improve the optical quality by eliminating the edge structure as they are less sensitive to stray light.
Interested in measurement solutions for pancake lenses?