| 摘要 |
PURPOSE:To reduce thermal expansion coefficients of directions X, Y, Z by forming an insulating layer between patterns of unidirectional fiber reinforced plastic. CONSTITUTION:Insulating layers 10 formed between patterns 1a and 2a, 2a and 2b, and 1b and 2b are formed of unidirectional fiber reinforced plastic 8, and vertically laminated unidirectional fiber reinforced plastic 9. Reinforcing fiber generally has small thermal expansion coefficient itself. Accordingly, if the fiber volume content ratio is raised, the coefficient can be reduced. That is, the unidirectional fiber reinforced plastic is used as the insulating layer, the fiber volume content ratio is raised, thereby reducing the thermal expansion coefficients in directions X, Y, Z. |
