| 摘要 |
PURPOSE:To decrease the deviation of registration under large temperature changes and vibration changes by interposing an elastic body between a prism group and a prism base, fixing the prism base to a base and fixing a lens system to a face opposite to the base. CONSTITUTION:The elastic body 3 is interposed between the prism group 1 and the prism bases 2a, 2b and the prism bases 2a, 2b are connected by a coupling member 4 to integrate them. Furthermore, a solid-state image pickup element (image pickup tube) 6 is fixed to the prism bases 2a, 2b or the coupling member 4 at the radiation face side of the prism group 1, fixed to the base 8 and a lens system is fitted to the opposite side. Thus, the difference in thermal expansion and vibration due to the difference in the thermal expansion coefficients of the prism group, the prism base and the coupling member are absorbed and the relative position relation of the image forming point of 3 solid-state image pickup elements (image pickup tube) with respect to the optical axis of the lens system is always unchanged without being affected by temperature changes.
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