| 摘要 |
PURPOSE:To obtain resistance to vibrations in cosmic environment, etc., and to prevent the optical axis of a lens from deviating by holding a lens in surface contact with the curved receiving surface of a receiving collar and the curved pressure surface of a pressure collar. CONSTITUTION:The curved receiving surface 11 which has curvature R1 equal to the curvature R1 of the lens 2 is formed at an outer peripheral part and a fitting surface 12 for the outer peripheral surface of the lens 2 is formed at the outer periphery of the curved receiving surface 11. The curved pressure surface 13 which has curvature R2 equal to the curvature R2 of the lens 2 is formed at the outer peripheral part and the external diameter is so set that the surface is inscribed with the fitting surface 12 of the receiving collar 3. Then, the lens 2 is fitted to the inside fitting surface 12 of the receiving collar 3 and the outer peripheral part curved surface on the side of the curvature R1 is brought into surface contact with the curved receiving surface; and the pressure collar 4 is fitted to the inside fitting surface 12 of the receiving collar 3 from behind the lens 2 and the curved pressure surface 13 is fixed in surface contact with the outer peripheral part curved surface of the lens 2 on the side of the curvature R2. Consequently, there is no shift against vibrations in cosmic environment.
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