Circuit board and electronic-component-equipped circuit board
A multilayer body includes insulator layers including a first insulator layer laminated in a vertical direction. Electrodes include a signal electrode and are provided at an upper main surface of the first insulator layer and arranged in a transverse direction. At least a portion of each of the electrodes is exposed to outside from a circuit board. First and second interlayer connection conductors extend through the first insulator layer in the vertical direction and electrically connect the signal electrode and a signal conductor layer. Mounting portions are located at the portions of the electrodes that are exposed to the outside from the circuit board. The first and second interlayer connection conductors are electrically connected to the signal electrode so as not to overlap the mounting portion that is provided at the signal electrode.
1 . A circuit board comprising:
a multilayer body including a plurality of insulator layers including a first insulator layer laminated in a vertical direction;
a plurality of electrodes including a signal electrode and provided at an upper main surface of the first insulator layer so as to be arranged in a transverse direction, at least a portion of each of the plurality of electrodes being exposed to outside from the circuit board;
a signal conductor layer provided at the multilayer body and located below the signal electrode; and
a first interlayer connection conductor and a second interlayer connection conductor extending through the first insulator layer in the vertical direction and electrically connecting the signal electrode and the signal conductor layer to each other; wherein
a plurality of mounting portions are located at the portions of the plurality of electrodes that are exposed to the outside from the circuit board;
the first interlayer connection conductor and the second interlayer connection conductor are electrically connected to the signal electrode so as not to overlap one of the plurality of mounting portions located at the signal electrode when viewed in the vertical direction;
the circuit board includes a mounting region including the plurality of electrodes and a line region connected to the mounting region and in which the signal conductor layer extends; and
a width of the multilayer body in the mounting region in a direction orthogonal or substantially orthogonal to a direction in which the signal conductor layer extends is larger than a width of the multilayer body in the line region in the direction orthogonal or substantially orthogonal to the direction in which the signal conductor layer extends.
2 . The circuit board according to claim 1 , wherein
the first interlayer connection conductor is connected to the signal electrode at a position farther forward in a rear side to a front side direction than the mounting portion that is provided at the signal electrode; and
the second interlayer connection conductor is connected to the signal electrode at a position farther rearward in the rear side to the front side direction than the mounting portion that is provided at the signal electrode.
3 . The circuit board according to claim 2 , wherein the first interlayer connection conductor, the mounting portion provided at the signal electrode, and the second interlayer connection conductor are sequentially arranged in a line from the front side to the rear side.
4 . The circuit board according to claim 1 , wherein
the plurality of insulator layers include a protective layer covering the plurality of electrodes;
the protective layer includes an opening;
at least a portion of the signal electrode is exposed to the outside from the circuit board through the opening;
the plurality of mounting portions are located at the opening; and
the first interlayer connection conductor and the second interlayer connection conductor overlap the protective layer when viewed in the vertical direction.
5 . The circuit board according to claim 1 , wherein
a thickness of the circuit board in the mounting region in the vertical direction is larger than a thickness of the circuit board in the line region in the vertical direction.
6 . The circuit board according to claim 5 , further comprising a reinforcement structure fixed to a lower main surface of the multilayer body in the mounting region.
7 . The circuit board according to claim 1 , wherein
the signal electrode includes:
a signal-electrode main body;
a signal-electrode first connecting portion; and
a signal-electrode second connecting portion; wherein
the mounting portions are located at the signal-electrode main body;
the first interlayer connection conductor is connected to the signal-electrode first connecting portion;
the second interlayer connection conductor is connected to the signal-electrode second connecting portion; and
a width of the signal-electrode first connecting portion in a direction orthogonal or substantially orthogonal to a direction in which the signal conductor layer extends and a width of the signal-electrode second connecting portion in the direction orthogonal or substantially orthogonal to the direction in which the signal conductor layer extends are each larger than a width of the signal-electrode main body in the direction orthogonal or substantially orthogonal to the direction in which the signal conductor layer extends.
8 . The circuit board according to claim 1 , further comprising a ground electrode surrounding the signal electrode when viewed in the vertical direction.
9 . The circuit board according to claim 8 , further comprising:
ground conductor layers provided at the insulator layers; and
one or more third interlayer connection conductors extending through the first insulator layer in the vertical direction and electrically connecting the ground electrode to the ground conductor layers; wherein
when viewed in a direction in which the first interlayer connection conductor and the second interlayer connection conductor are arranged and in a direction orthogonal or substantially orthogonal to the vertical direction, the one or more third interlayer connection conductors do not overlap either the first interlayer connection conductor or the second interlayer connection conductor.
10 . The circuit board according to claim 1 , further comprising:
connection conductor layers provided at the insulator layers; and
a fourth interlayer connection conductor extending through the insulator layers in the vertical direction and connecting the connection conductor layers to the signal conductor layer;
the first interlayer connection conductor and the second interlayer connection conductor are connected to the connection conductor layers; and
the fourth interlayer connection conductor does not overlap either the first interlayer connection conductor or the second interlayer connection conductor when viewed in the vertical direction.
11 . The circuit board according to claim 1 , wherein a material of the plurality of insulator layers includes a thermoplastic resin.
12 . The circuit board according to claim 1 , wherein the signal conductor layer is a power transmission line or an antenna line.
13 . The circuit board according to claim 1 , further comprising a plurality of conductive bonds each of which is provided at one of the plurality of mounting portions.
14 . The circuit board according to claim 1 , further comprising a plurality of plating layers each of which is provided at one of the plurality of electrodes.
15 . An electronic-component-equipped circuit board comprising:
an electronic component; and
a circuit board; wherein
the electronic component includes:
at least one terminal; wherein
the circuit board includes:
a multilayer body including a plurality of insulator layers including a first insulator layer laminated in a vertical direction;
a signal electrode provided at an upper main surface of the first insulator layer and including a portion exposed to outside from the circuit board;
a signal conductor layer provided at the multilayer body and located below the signal electrode;
a first interlayer connection conductor and a second interlayer connection conductor extending through the first insulator layer in the vertical direction and electrically connect the signal electrode and the signal conductor layer to each other; and
a conductive bond; wherein
a mounting portion is located at the portion of the signal electrode that is exposed to the outside from the circuit board;
the first interlayer connection conductor and the second interlayer connection conductor are electrically connected to the signal electrode so as not to overlap the mounting portion, which is provided at the signal electrode when viewed in the vertical direction;
the conductive bond electrically connects the at least one terminal of the electronic component and the mounting portion to each other;
the circuit board includes a mounting region including the plurality of electrodes and a line region connected to the mounting region and in which the signal conductor layer extends; and
a width of the multilayer body in the mounting region in a direction orthogonal or substantially orthogonal to a direction in which the signal conductor layer extends is larger than a width of the multilayer body in the line region in the direction orthogonal or substantially orthogonal to the direction in which the signal conductor layer extends.
16 . The electronic-component-equipped circuit board according to claim 15 , wherein
the at least one terminal includes a plurality of terminals; and
the electronic component is a connector including the plurality of terminals.
17 . The electronic-component-equipped circuit board according to claim 15 , wherein a material of the plurality of insulator layers includes a thermoplastic resin.
18 . The electronic-component-equipped circuit board according to claim 15 , wherein the signal conductor layer is a power transmission line or an antenna line.
19 . The electronic-component-equipped circuit board according to claim 15 , further comprising a conductive bond provided at the mounting portion.