| 摘要 |
PROBLEM TO BE SOLVED: To obtain a lightweight optical sensor used for an artificial satellite reducing the focus movement caused by thermal deformation on an orbit, preventing light other than light to be observed from being incident on a photoelectric conversion part, and having resolving power enhanced by reducing the number of members. SOLUTION: The optical sensor has a cylindrical lens-barrel for cutting off light other than light to be observed, the condensing lens arranged in the lens-barrel to condense light incident from the outside, and the photoelectric converter arranged to one end of the lens-barrel opposed to the condensing lens. The condensing lens and the photoelectric converter are respectively fixed to the lens-barrel through a support, and the lens-barrel is constituted of a carbon fiber reinforced plastic material of which the expansion in the optical axis direction of the lens-barrel and the direction crossing the optical axis as a right angle becomes zero.
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