In this paper, we compare a standard wide angle system design to an array of four off-axis micro optics systems. The reference system is a single x/y-symmetric optical system to reach full field of view (FOV) of 140°×170°. To obtain the same FOV an array of four off-axis systems, consisting of tilted and decentered freeform elements, with small sub FOVs is designed. The system design is such that a production via 3D-two-photon printing is possible. We compare the performances of the standard system to that of the array of off-axis systems.
Prism-based augmented reality displays are affordable solutions for head mounted devices. In this paper we supply a seldom applied reflective prism form, which does not require rays to be total internal reflected (TIR) on the surfaces. Therefore, the different folding geometry leads to more freedom in the optical architecture and better performance. Furthermore, to develop the full-color property, an off-axis element is cemented to correct the chromatic aberration. For the specifications, the eye relief is 18mm and the field of view is 50° horizontally and 30° vertically, respectively.
Mixed reality head mounted display (HMD) freeform prism systems are widely applied with one surface in total internal reflection (TIR). This however limits the angle of the incident rays and decreases the design freedom. To avoid this, two seldom used design forms of HMD systems are studied and compared to the general applied TIR HMD optics. One of them is a catadioptric HMD system, consisting of one lens and two mirrors, the other is a prism HMD with a different folding geometry. The designs are compared for a field of view of 40°×30° and an increased field of view of 50°×30°. The evaluation indicates good performance; in particular the prism with an alternate folding geometry indicates advantages in both performance and size.
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