Image Number 4 for United States Patent #7563342.
In a press process, a buffer member is placed on an RCC with a stainless steel plate between in such a way that the long sides and the short sides of the buffer member are aligned with the long sides and the short sides of the RCC respectively. The length of the long sides and the length of the short sides of the buffer member are designed to be smaller than the lengths of the long sides and the length of the short sides of the RCC respectively. With this feature, it is possible to reduce convexity on the RCC that is created in the peripheral region upon pressing the RCC to a core member.
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