| 摘要 |
A dual image viewer comprises a first enclosure having a first entrance for admitting light, a first optical path for light and a first exit for light; and a second enclosure having a second entrance for admitting light, a second optical path for light and a second exit for light, the second optical path intersecting the first optical path near the second exit. A semireflective surface is interposed along the first optical path where the second optical path intersects the first optical path, so that at least a portion of the light entering the first entrance is transmitted through the surface towards the first exit and at least a portion of the light entering the second entrance is reflected by the surface and deflected generally along the first optical path towards the first exit.
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