Light space-transmission device

摘要

A light space-transmission device has a simple configuration and a wide range of optical-axis correction. Provided are light beam transmitting means (10) for modulating a light beam with the stated information signal and for transmitting the light beam, first luminous-flux-diameter converting means (33) for enlarging the luminous-flux-diameter of the light beam that is sent from the light beam transmitting means (10) and for transmitting the light beam, second luminous-flux-diameter converting means (36) for enlarging the luminous-flux-diameter of the light beam that is sent from the first luminous-flux-diameter converting means (33) and for transmitting the light beam, and optical-axis correcting means (20) that is inserted into the optical path of the light beam lying between the first luminous-flux-diameter converting means (33) and the second luminous-flux-diameter converting means (36) and that controls the angle of the optical axis of the light beam thrown to the second luminous-flux-diameter converting means (36).