| 摘要 |
PROBLEM TO BE SOLVED: To provide a light receiving lens system able to be constituted at a low cost and further capable of efficiently restraining the spherical aberration of infrared light, in an optical spatial transmitting device having a light receiving part for condensing the infrared light on a photodetector. SOLUTION: This light receiving lens system is used in the optical spatial transmitting device in order to condense the infrared light on the photodetector, and is provided with one positive lens and one negative lens.
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