Printed wiring board, printed circuit board, and electronic device
Provided is a printed wiring board comprising: a substrate; a conductive layer including a land and a wiring and formed on a surface of the substrate, the wiring having a width smaller than the land and drawn from the land; and an insulating layer formed on the conductive layer. The insulating layer has an opening corresponding to a position of the land, and an edge of the opening runs above the land and above one of edges in a width direction of the wiring.
1. A printed wiring board comprising:
a substrate;
a conductive layer including a plurality of lands, at least a part of which are provided in a matrix, and a wiring, and formed on a surface of the substrate, the plurality of lands including a first land provided at an outermost circumference of the plurality of lands and a second land provided inside the outermost circumference of the plurality of lands; and
an insulating layer having a plurality of openings and formed on the conductive layer, the plurality of openings including a first opening corresponding to the first land and a second opening corresponding to the second land,
wherein the wiring has a boundary with the second land, a first edge, and a second edge, the wiring being drawn from the boundary, the first edge and the second edge being formed along a drawing direction of the wiring, and a distance between the first edge and the second edge being smaller than a width of the second land,
wherein the second land includes a first region covered with the insulating layer and a second region exposed by the second opening, the first region being connected to the first edge of the wiring and the second region being connected to the second edge of the wiring,
wherein an edge of the second opening runs above the second land and above the second edge of the wiring and does not run above the first edge of the wiring,
wherein the first land includes a third region covered with the insulating layer and a fourth region exposed by the first opening, and
wherein the first region is smaller than the third region.
2. The printed wiring board according to claim 1 ,
wherein the edge of the second opening has an intersecting point with the boundary, and
wherein an angle of a normal direction of the edge of the second opening running from the intersecting point to a second opening direction at the intersecting point relative to a direction in which the wiring is drawn, is less than or equal to 90 degrees.
3. The printed wiring board according to claim 2 , wherein a shape of the second opening has a recess inward of the second opening in a top view from a direction perpendicular to the surface of the substrate.
4. The printed wiring board according to claim 1 , wherein the wiring is provided to be separated from the second land in a spiral manner.
5. The printed wiring board according to claim 1 , wherein the insulating layer is a solder resist that, when an electronic component is mounted on the printed wiring board by using solder, defines a range where the solder can be connected to the conductive layer.
6. The printed wiring board according to claim 1 , wherein a shape of the second land is any one of a circle, an ellipse, an oval, a rectangle, a square, a rounded rectangle, and a rounded square in a top view from a direction perpendicular to the surface of the substrate.
7. The printed wiring board according to claim 1 , wherein the second opening of the insulating layer is arranged so as to expose a part of the surface of the substrate.
8. A printed circuit board comprising:
a printed wiring board including:
a substrate,
a conductive layer including a plurality of lands, at least a part of which are provided in a matrix, and a wiring, and formed on a surface of the substrate, the plurality of lands including a first land provided at an outermost circumference of the plurality of lands and a second land provided inside the outermost circumference of the plurality of lands; and
an insulating layer having a plurality of openings and formed on the conductive layer, the plurality of openings including a first opening corresponding to the first land and a second opening corresponding to the second land; and
an electronic component joined to the conductive layer by solder,
wherein the wiring has a boundary with the second land, a first edge, and a second edge, the wiring being drawn from the boundary, the first edge and the second edge being formed along a drawing direction of the wiring, a distance between the first edge and the second edge being smaller than a width of the second land,
wherein the second land includes a first region and a second region, the first region being connected to the first edge of the wiring and the second region being connected to the second edge of the wiring,
wherein the second region and a part of the second edge of the wiring are in contact with the solder and the first region and the first edge of the wiring are not in contact with the solder,
wherein the first land includes a third region covered with the insulating layer and a fourth region exposed by the first opening, and
wherein the first region is smaller than the third region.
9. The printed circuit board according to claim 8 ,
wherein an edge of the second opening runs above the second land and the second edge of the wiring and does not run above the first edge of the wiring.
10. The printed circuit board according to claim 9 , wherein the second opening of the insulating layer is arranged so as to expose a part of the surface of the substrate.
11. The printed circuit board according to claim 9 ,
wherein the edge of the second opening has an intersecting point with the boundary, and
wherein an angle of a normal direction of the edge of the second opening running from the intersecting point to a second opening direction at the intersecting point relative to a direction in which the wiring is drawn, is less than or equal to 90 degrees.
12. The printed circuit board according to claim 11 , wherein a shape of the second opening has a recess inward of the second opening in a top view from a direction perpendicular to the surface of the substrate.
13. An electronic device comprising:
a printed circuit board built in the electronic device; and
an electronic component,
wherein the printed circuit board includes a printed wiring board including:
a substrate,
a conductive layer including a plurality of lands, at least a part of which are provided in a matrix, and a wiring, and formed on a surface of the substrate, the plurality of lands including a first land provided at an outermost circumference of the plurality of lands and a second land provided inside the outermost circumference of the plurality of lands; and
an insulating layer having a plurality of openings and formed on the conductive layer, the plurality of openings including a first opening corresponding to the first land and a second opening corresponding to the second land,
wherein the electronic component is joined to the conductive layer by solder,
wherein the wiring includes a boundary with the second land, a first edge, and a second edge, the wiring being drawn from the boundary, the first edge and the second edge being formed along a drawing direction of the wiring, and a distance between the first edge and the second edge being smaller than a width of the second land,
wherein the second land includes a first region covered with the insulating layer and a second region exposed by the second opening, the first region being connected to the first edge of the wiring and the second region being connected to the second edge of the wiring,
wherein the second region and a part of the second edge of the wiring are in contact with the solder and the first region and the first edge of the wiring are not in contact with the solder,
wherein the first land includes a third region covered with the insulating layer and a fourth region exposed by the first opening, and
wherein the first region is smaller than the third region.
14. The electronic device according to claim 13 ,
wherein an edge of the second opening runs above the second land and the second edge of the wiring and does not run above the first edge of the wiring.
15. The electronic device according to claim 14 , wherein the second opening of the insulating layer is arranged so as to expose a part of the surface of the substrate.
16. The electronic device according to claim 14 ,
wherein the edge of the second opening has an intersecting point with the boundary, and
wherein an angle of a normal direction of the edge of the second opening running from the intersecting point to a second opening direction at the intersecting point relative to a direction in which the wiring is drawn, is less than or equal to 90 degrees.
17. The electronic device according to claim 16 , wherein a shape of the second opening has a recess inward of the second opening in a top view from a direction perpendicular to the surface of the substrate.