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

Claim 15:
16. A method for manufacturing a capacitive pressure sensor, the method comprising:
making a first electrode sheet by forming a first electrode layer on a first insulating sheet;
making a second electrode sheet by forming a second electrode layer on a second insulating sheet;
making 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 in the elastic body layer;
applying adhesive layers on both sides of the elastic body layer to attach the elastic body layer between the first electrode sheet and the second electrode sheet, and wherein one of the adhesive layers is formed on a surface of the elastic body layer on a side of the first electrode sheet and another of the adhesive layers is formed on a surface of the elastic body layer on a side of the second electrode sheet;
wherein when the first electrode sheet or the second electrode sheet is pressed, the capacitive pressure sensor detects a pressing force based on a capacitance change between the first electrode layer and the second electrode layer according to a distance change between the first electrode layer and the second electrode layer, 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.