Capacitive sensor
A capacitive sensor includes a base material provided with a pattern of a light-transmissive conductive film. The light-transmissive conductive film contains metal nanowires. The pattern includes a detection pattern formed of a plurality of detection electrodes arranged with intervals and a plurality of lead-out wirings linearly extending in a first direction from the corresponding ones of the plurality of the detection electrodes. At least one of the detection electrodes of the detection pattern includes a current path-setting section for elongating the linear path length of the current from the detection electrode toward the lead-out wiring.
1. A capacitive sensor comprising:
a base material provided with a pattern of a light-transmissive conductive film, wherein
the light-transmissive conductive film has a structure in which metal nanowires are dispersed in a binder; and
the pattern includes:
a detection pattern of a plurality of detection electrodes arranged with intervals; and
a plurality of lead-out wirings linearly extending in a first direction from corresponding ones of the plurality of the detection electrodes, wherein
at least one of the detection electrodes of the detection pattern includes a current path-setting section for elongating a linear path length of a current from the detection electrode toward the lead-out wiring;
the current path-setting section includes a slit pattern disposed to obstruct the linear path length of the current;
the current path-setting section includes a plurality of slit patterns having a length of a half or more of the length of the detection electrode and restricting the current path;
the plurality of the slit patterns are disposed parallel to each other;
at least a part of the plurality of the slit patterns inward extends from the end of the detection electrode; and
adjacent ones of the slit patterns restrict the current path at positions different from each other;
the current path-setting section includes a wiring path that allows the path of current flowing from the detection electrode toward the lead-out wiring to meander;
at least one of the detection electrodes including the current path-setting section and the lead-out wiring extending therefrom have a structure in which the metal nanowires are dispersed in a binder and are formed in a detection region;
the plurality of the detection electrodes are arranged in the first direction;
a plurality of pair of one of the detection electrodes and one of the lead-out wirings extending from corresponding one of the detection electrodes are formed so as to be separated from each other;
the plurality of the lead-out wirings in the detection region include an equal-interval region where the lead-out wirings are arrayed with a constant first pitch in a second direction orthogonal to the first direction;
the plurality of the slit patterns have widths equal to the intervals of the plurality of the lead-out wirings; and
the pitch of the plurality of the slit patterns is equal to the first pitch.
2. The capacitive sensor according to claim 1 , wherein
the first direction is a direction toward an external terminal region from the detection pattern; and
the current path-setting section is at least disposed to the detection electrode closest to the external terminal region.
3. The capacitive sensor according to claim 2 , wherein the current path-setting section is disposed to each of the plurality of the detection electrodes.
4. The capacitive sensor according to claim 3 , wherein the metal nanowires include silver nanowires.
5. The capacitive sensor according to claim 2 , wherein the metal nanowires include silver nanowires.
6. The capacitive sensor according to claim 1 , wherein the current path-setting section is disposed to each of the plurality of the detection electrodes.
7. The capacitive sensor according to claim 6 , wherein the metal nanowires include silver nanowires.
8. The capacitive sensor according to claim 1 , wherein the metal nanowires include silver nanowires.
9. A capacitive sensor comprising:
a base material provided with a pattern of a light-transmissive conductive film, wherein
the light-transmissive conductive film contains metal nanowires; and
the pattern includes:
a detection pattern of a plurality of detection electrodes arranged with intervals; and
a plurality of lead-out wirings linearly extending in a first direction from corresponding ones of the plurality of the detection electrodes, wherein
at least one of the detection electrodes of the detection pattern includes a current path-setting section for elongating a linear path length of a current from the detection electrode toward the lead-out wiring;
the current path-setting section includes a slit pattern disposed for obstructing the linear path length of the current; and
the current path-setting section includes a plurality of slit patterns having a length of a half or more of the length of the detection electrode and restricting the current path;
the plurality of the slit patterns are disposed parallel to each other;
at least a part of the plurality of the slit patterns inward extends from the end of the detection electrode;
adjacent ones of the slit patterns restrict the current path at positions different from each other;
the current path-setting section includes a wiring path that allows the path of current flowing from the detection electrode toward the lead-out wiring to meander;
the plurality of the detection electrodes are arranged in the first direction;
a plurality of pair of one of the detection electrodes and one of the lead-out wirings extending from corresponding one of the detection electrodes are formed so as to be separated from each other,
the plurality of the lead-out wirings in the detection region include an equal-interval region where the lead-out wirings are arrayed with a constant first pitch in a second direction orthogonal to the first direction;
the plurality of the slit patterns have widths equal to the intervals of the plurality of the lead-out wirings; and
the pitch of the plurality of the slit patterns is equal to the first pitch.