| 摘要 |
A light space-transmission device includes a light beam transmitting block for modulating a light beam with information signal and for transmitting the light beam, a first luminous-flux-diameter converting part for enlarging the luminous-flux-diameter of the light beam that is sent from the light beam transmitting block and for transmitting the light beam, a second luminous-flux-diameter converting part for enlarging the luminous-flux-diameter of the light beam that is sent from the first luminous-flux-diameter converting part and for transmitting the light beam. An optical-axis correcting portion is inserted into the optical path of the light beam between the first luminous-flux-diameter converting part, and the second luminous-flux-diameter converting part and controls the angle of the optical axis of the light beam thrown to the second luminous-flux-diameter converting part.
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