| 摘要 |
PURPOSE:To control so that the dislocation and the inclination of an optical axis due to heat deformation is suppressed at a minimum level and to minimize color shiftings of three kinds of colors R, G and B by combining appropriately materials of two, at least, mounting members which mount an image pickup element on a housing. CONSTITUTION:A three color separating prism 3 which separates photographing light passes through a filter 2 to three chrominance signals R, G and B is held within a housing 4, and mount rings 8-10 which hold each of image pickup tubes 5-7 are fixed with mounting members 11a, 11b-13a, and 13b respectively. As each material of the mounting members 11b-13b, the material having a larger coefficient of thermal expansion than those of the mounting members 11a-13a is used, and the dislocation of the optical axis and the inclination of the image pickup tube 5 due to a temperature change is set so as to agree with those of the three color separation prism 3. For example, aluminum and number are used for members 11a and 11b, and copper alloy and the number for members 12a and 12b, and magnesium and the copper alloy for members 13a and 13b. |
