| 摘要 |
PROBLEM TO BE SOLVED: To improve the precision of a fingerprint recognition.SOLUTION: A printed wiring board of an embodiment comprises: an insulation layer having a first face and a second face on the opposite side of the first face; a first conductor circuit for a fingerprint authentication on the first face of the insulation layer; a second conductor circuit for a fingerprint authentication on the second face of the insulation layer; and a solder resist layer on the first face of the insulation layer and on an upper side on the first conductor circuit. Moreover, the dielectric constant of the solder resist layer on the upper side is higher than the dielectric constant of the insulation layer.SELECTED DRAWING: Figure 1 |
