Bi-directional viewer just likes a lens of camera. Unlike conventional camera lens, the bi-directional viewer captures not
only front view but also side view around the bi-directional viewer. The barrel of bi-directional viewer was designed to
have cuts in the side to allow side light to come through, and we use two aspherical mirrors to receive and change the
side light to converge on the main optical path. The front view and side view can be imaged simultaneously on an image
sensor. Commercial aspherized achromatic lens and micro video lens were also used to keep the image quality and
miniaturize the size of the bi-directional viewer respectively. We report on the development of bi-directional viewer,
including optical design, optical simulation, optomechanics design, fabrication techniques, assembly procedure and
performance testing. The MTF of the bi-directional viewer is also measured and discussed in this paper. We successfully
design and realize a bi-directional viewer, which can perform 100 lp/mm spatial frequency image in detail above 20%
contrast in the 7.6 mm front view area. And we keep the dimensions of this device within 35 mm in total length and Φ20
mm in diameter.
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