Ultrasound probe and flexible substrate used in ultrasound probe
An ultrasound probe of the present disclosure includes an ultrasound element unit 1 , to which a flexible substrate 7 is connected, the flexible substrate 7 including lamination of a ground layer 7 e and a signal layer 7 a via an insulation layer 7 c . The flexible substrate 7 includes a bending part and a flat part. The signal layer 7 a includes a linear first signal line and a linear second signal line that are adjacent to each other. The ground layer 7 e at the bending part includes a linear first ground line and a linear second ground line that are adjacent to each other. The first signal line and the first ground line are opposed to each other, and the second signal line and the second ground line are opposed to each other.
1. An ultrasound probe including an ultrasound element unit, to which a flexible substrate is connected, the flexible substrate including a lamination of a ground layer and a signal layer via an insulation layer, wherein:
the flexible substrate includes a bending part and a flat part,
the flexible substrate is divided into a plurality of blocks, which are divided from each other,
the plurality of blocks of the flexible substrate are overlaid on each other such that the flexible substrate is folded to be overlaid on itself at the bending part,
the signal layer includes a linear first signal line and a linear second signal line, which, in a state before the flexible substrate is folded, are adjacent to each other and parallel to each other,
the ground layer includes a linear first ground line and a linear second ground line, which, in the state before the flexible substrate is folded, are adjacent to each other and parallel to each other,
the first signal line and the first ground line are opposed to each other in a lamination direction at the bending part, and
the second signal line and the second ground line are opposed to each other in the lamination direction at the bending part.
2. The ultrasound probe according to claim 1 , wherein the ground layer includes a part which is continuously formed at the flat part from above the first signal line to above the second signal line.
3. The ultrasound probe according to claim 1 , wherein the insulation layer between the signal layer and the ground layer is continuously formed at the bending part from above the first signal line to above the second signal line.
4. The ultrasound probe according to claim 1 , wherein the first signal line has a width smaller than a width of the first ground line.
5. The ultrasound probe according to claim 1 , wherein:
the flexible substrate is folded to be overlaid on itself at the bending part by a fold that is concave from a point of view of the ground layer, at a first part of the bending part, and by a fold that is convex from the point of view of the ground layer, at a second part of the bending part, and
the first ground line and the second ground line are located at the second part of the bending part.
6. The ultrasound probe according to claim 5 , wherein the ground layer is continuously formed at the first part of the bending part from above the first signal line to above the second signal line.
7. The ultrasound probe according to claim 1 , wherein the flexible substrate includes a mark to enable visual checking of a bending position at the bending part.
8. The ultrasound probe according to claim 7 , wherein the mark is inscribed at the insulation layer.
9. The ultrasound probe according to claim 1 , wherein the ground layer has mesh-form patterning at the flat part.
10. The ultrasound probe according to claim 1 , wherein:
the flexible substrate is folded to be overlaid on itself at the bending part by a fold that is concave from a point of view of the ground layer, at a first part of the bending part, and by a fold that is convex from the point of view of the ground layer, at a second part of the bending part, and
the ground layer has mesh-form patterning at the first part of the bending part.
11. A flexible substrate configured to be used for an ultrasound probe including an ultrasound element unit to which the flexible substrate is connected, the flexible substrate comprising:
a lamination of a ground layer and a signal layer via an insulation layer,
wherein:
the flexible substrate has a bending part and a flat part,
the flexible substrate is divided into a plurality of blocks, which are divided from each other, and which are configured to be overlaid on each other such that the flexible substrate is foldable to be overlaid on itself at the bending part,
the signal layer includes a linear first signal line and a linear second signal line that are adjacent to each other and parallel to each other,
the ground layer includes a linear first ground line and a linear second ground line that are adjacent to each other and parallel to each other,
the first signal line and the first ground line are opposed to each other in a lamination direction at the bending part,
the second signal line and the second ground line are opposed to each other in the lamination direction at the bending part, and
gaps are provided between the first signal line and the second signal line, and between the first ground line and the second ground line.