Printed wiring board
AssigneeFanuc Corporation
InventorsNobuhisa Sugimoto, Takeshi Sawada
Life of this patent
Estimating the term…
Abstract
In a printed wiring board on which an electronic component comprising electrode terminal rows on four peripheral sides or two opposite sides thereof is mounted, each of pads at the both ends of pad rows corresponding to the electrode terminal rows extend outwardly relative to the other pads in the direction of arrangement of the pads and has a shape obtained by diagonally cutting a corner located farthest from the center of the electronic component.
Claims6
A printed wiring board on which an electronic component comprising electrode terminal rows on four peripheral sides or two opposite sides thereof is mounted, the printed wiring board comprising:
- pad rows corresponding to the electrode terminal rows;
- and
- each of pads at the both ends of the pad rows comprises an extension extending outwardly relative to the other pads not at the both ends of the pad rows, the extension extending outwardly relative to the other pads in the direction of arrangement of the pads from the center of the electronic component, the extension having a shape obtained by diagonally cutting a corner located farthest from the center of the electronic component, wherein
- one of the pads of the printed wiring board is a corner pad overlapping a corner of the electronic component;
- each of the pads at the both ends of the pad rows comprises a solder fillet formed on the pad and on the extension when the electronic component is mounted on the printed wiring board, and
- the solder fillet formed on the pads and the extension of the pads at the both ends of the pad rows is greater and thicker than a solder fillet formed on the pad not at the both ends of the pad rows, and
- wherein, in the direction of arrangement of the pads, each of pads at the both ends of the pad rows has a width greater than widths of the other pads not arranged at the both ends of the pad rows.
A printed wiring board on which an electronic component comprising electrode terminal rows on four peripheral sides or two opposite sides thereof is mounted, the printed wiring board comprising:
- pad rows corresponding to the electrode terminal rows;
- and
- each of pads at the both ends of the pad rows comprises an extension extending outwardly relative to the other pads in the direction of arrangement of the pads from the center of the electronic component, the extension having a shape obtained by diagonally cutting a corner located farthest from the center of the electronic component, wherein
- the electronic component has first and second sides forming a corner of the electronic component,
- one of the electrode terminals of the electronic component is a corner electrode terminal overlapping said corner of the electronic component, said corner electrode terminal having
- a third side extending along the first side of the electronic component,
- a fourth side extending along the second side of the electronic component, and
- a corner where the third side and the fourth side meet each other,
- one of the pads of the printed wiring board is a corner pad overlapping both said corner electrode terminal and said corner of the electronic component, said corner pad having
- a fifth side extending along the first side of the electronic component and the third side of said corner electrode terminal, and
- a sixth side extending along the second side of the electronic component and the fourth side of said corner electrode terminal,
- a line, which is an extension of the third side from the corner of said corner electrode terminal, intersects the sixth side at a first intersection,
- another a line, which is an extension of the fourth side from the corner of said corner electrode terminal, intersects the fifth side at a second intersection, and
- said corner pad further has a slanting side connecting the first intersection and the second intersection.
Dependencies are inferred from the claim text.