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Translating step 11

Step 11
Where prior Oculus Rift kits shipped with interchangeable circular lenses (left), the CV1 uses a single set of non-removable, asymmetric lenses (right). A closeup of the CV1 lens reveals these concentric rings, a telltale sign of Fresnel lenses. These cleverly manufactured lenses do the same job as the thick, bulging, curved plastic lenses seen in prior Rifts—using thin arrays of concentric prisms that weigh far less. The Fresnel lens yields the same large viewing angle and short focal length, but with a fraction of the material—which is exactly what VR needs. It all has to go into a brick-sized device you can strap to your face for hours, without putting a strain on your poor neck muscles.
  • Where prior Oculus Rift kits shipped with interchangeable circular lenses (left), the CV1 uses a single set of non-removable, asymmetric lenses (right).

  • A closeup of the CV1 lens reveals these concentric rings, a telltale sign of Fresnel lenses. These cleverly manufactured lenses do the same job as the thick, bulging, curved plastic lenses seen in prior Rifts—using thin arrays of concentric prisms that weigh far less.

  • The Fresnel lens yields the same large viewing angle and short focal length, but with a fraction of the material—which is exactly what VR needs. It all has to go into a brick-sized device you can strap to your face for hours, without putting a strain on your poor neck muscles.

  • Bonus round: by varying the size and shape of the concentric prisms, Oculus was able to fine-tune the lens for this specific application, minimizing spherical aberrations (or distortions) that may result from a traditional curved lens. This probably explains the asymmetric shape.

前两个版本的Oculus Rift圆形镜片是可以随意互换的(左),但是消费者版使用了非常独特的一套不可移除的不对称镜片(右)。

来一个 CV1透镜的特写,我们看到透镜上有很多同心圆,这是菲涅尔透镜的明显特征。相比于前几代笨重、曲面的圆形镜片,菲涅尔透镜的重量大大减轻——它使用了一系列的同心圆。

但却有同样的大视角和短焦距,但是只使用了以前几分之一的材料——这和VR眼镜简直就是绝配。这样一来,你就不必把砖块一样重的设备绑在脸上几个小时,导致颈部肌肉拉伤。

加分点:通过同心圆大小和形状的变化,Oculus能够根据具体情况微调,以减少传统曲面镜造成的视觉扭曲。这也解释了不对称形状。

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