Patent ID: 11972081
Assignee: NISSHA CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 7:
8. A capacitive pressure sensor, comprising:
a first electrode sheet in which a first electrode layer is formed on a first insulating sheet;
a second electrode sheet in which a second electrode layer is formed on a second insulating sheet;
an elastic body layer formed by a foam sheet in which air bubbles having an average air bubble diameter of 2 to 40 μm are dispersed and sandwiched between the first electrode sheet and the second electrode sheet; and
adhesive layers, one of the adhesive layers being formed on a surface of the elastic body layer on a side of the first electrode sheet and another of the adhesive layers being formed on a surface of the elastic body layer on a side of the second electrode sheet, wherein
the first electrode layer and the second electrode layer are made from one of metal films and conductive paste films,
when the first electrode layer and the second electrode layer are made from the conductive paste films, the first electrode layer and the second electrode layer are directly formed by a printing method, and, wherein
Vg/(Vp+Vg) in a surface layer region at a depth of 20 μm from a surface of the foam sheet is smaller than a half of Vg/(Vp+Vg) in an inner region deeper than the surface layer region of the foam sheet,
Vg refers to a volume of gases in the air bubbles contained per unit volume, and
Vp refers to a volume of plastic contained per unit volume in a portion where the air bubbles are absent.