FLEXIBLE PRINTED WIRING BOARD AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a flexible printed wiring board which hardly has a dielectric breakdown even if it operates on a high voltage under the conditions of high temperatures and high humidity. SOLUTION: A one-sided or double-sided flexible printed wiring board comprises a base material 1 having a pair of opposed surfaces, wiring pattern layers 2a and 2b formed on either or both of the surfaces of the base material 1, and coverlays 4a and 4b formed above the wiring pattern layers respectively. Oxide films 5a and 5b of silicon oxide or aluminum oxide are formed on at least one of the surfaces of the flexible printed wiring board.