Why consider a rigid-flex format for a printed circuit board? The first and most obvious answer is to make use of the flexibility, and to permit movement between two conventional circuit boards, even if the movement is limited to providing tolerance of vibration. Flex circuits that actually flex in regular use can, however, be considered a special case of rigid-flex designs. Often, the intent is to provide an efficient interconnect between two boards that do not lie in the same plane. In such cases, the flexible part may only flex during final assembly of the product, and never do so again.
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