Patent ID: 7242086
Filing Date: 2007-07-10
Classification: H01L,H05K,Y02P

Abstract:
1. A printed wiring board having first and second wiring patterns that are formed on a mounting surface thereof so as to oppose each other across an insulating region, an optical semiconductor bare chip being flip-chip mounted on the mounting surface and having, on one surface thereof, first and second electrodes that are disposed so as to oppose each other, and the first and second wiring patterns respectively corresponding in position and shape to the first and second electrodes, wherein in a plan view of the insulating region divided into a first region that includes a point nearest to a center point of the optical semiconductor bare chip that takes a normal mounting position, and second and third regions that sandwich the first region, (i) an outer edge portion of the first wiring pattern which adjoins the second region, and an outer edge portion of the second wiring pattern which adjoins the third region, and/or (ii) an outer edge portion of the first wiring pattern which adjoins the third region, and an outer edge portion of the second wiring pattern which adjoins the second region, are formed so as to recede inwardly as a distance from the center point increases with respect to outer edges of the first and second electrodes of the optical semiconductor bare chip that takes the normal mounting position.