Printed wiring board and manufacturing method thereof

    公开(公告)号:JP5293527B2

    公开(公告)日:2013-09-18

    申请号:JP2009215268

    申请日:2009-09-17

    Abstract: PROBLEM TO BE SOLVED: To provide a printed wiring board allowing for stable and accurate appearance quality check of an opening pattern of a via, and which is capable of suppressing or eliminating the generation of appearance unevenness, poor quality, or the like, in an electroless tin plated film formed on the surface of a land 5, and to provide a method of manufacturing the printed wiring board. SOLUTION: The printed wiring board includes a lead section 9 for detecting elution of copper, where the surface is exposed with an area smaller than an exposed area of the land 5, at a position differing from the land 5 and the electroless tin plated film is provided on the surface. In PSR films 6, 15, a first layer 6 and a second layer 15 are laminated on an insulating substrate 1, in this order. The film thickness T1 of the first layer 6 is not less than 8 μm and not more than 20 μm, in terms of height from the surface of a copper wiring pattern 3, the film thickness T2 of the second layer is not less than 5 μm and not more than 20 μm, in terms of height from the surface of the second layer 15, and the aspect ratio of the via 7, assuming that the opening area of the via 7 is converted into a circle having the same area, is not more than 0.10 for both of the first layer 6 and the second layer 15. COPYRIGHT: (C)2011,JPO&INPIT

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