Skip to main content
English
Chinese

Translating step 12

Step 12
But wait—if Fresnel lenses do away with the bulging curves of traditional lenses, why are these lenses curved?
  • But wait—if Fresnel lenses do away with the bulging curves of traditional lenses, why are these lenses curved?

  • Turns out, Oculus went a step further down the optical tunnel, and manufactured hybrid Fresnel lenses.

  • These lenses are made up of concentric prisms of uniform thickness (like any other Fresnel lens). But an extra, sloping layer is added to the back of the lens, creating a shape that mimics a traditional curved lens—and allowing the focus to vary along the vertical axis of the lens.

  • That's why the Rift instructs you to focus the headset by simply pushing it higher or lower on your face. Look through a different part of the lens until you find the focus suited to your eyes. Bingo, no more three-sets-of-lenses Rifts.

但是——如果菲涅尔透镜不需要传统透镜的曲面镜,那为什么这些透镜还是曲面的呢?

且慢!各位看官呐,请随我仔细看来,Oculus制造工艺更上一层楼,使用了混合型菲涅尔透镜。

类似一般的菲涅尔透镜,这些镜片由许多同心棱镜组成。但是额外的,这个混合型菲涅尔透镜在镜片后面增加了一个曲面层,从而形成了一个类似传统曲面透镜的形状。基于透镜组的原理——这样的独特结构可以沿着其纵轴变焦。

这下就很容易理解,为何Rift公司只是教导大家把VR眼镜在脸上推高或推低就可简单地完成聚焦。通过透镜不同部分来找到适合你眼睛的焦点。对了,不再有三套透镜了。

Your contributions are licensed under the open source Creative Commons license.