A monitoring method is adapted for a circuit board. The circuit board includes a board body, a main circuit, and a standby circuit. The main circuit is located on the board body. The standby circuit is located on the board body, and is electrically connected to the main circuit. The standby circuit includes a first pressure detection circuit and a control circuit. The first pressure detection circuit is located at an area being monitored of the board body, and the control circuit outputs a first signal or a second signal according to a first detection value and a first predetermined range of the first pressure detection circuit.

A conductive ink composition contains a (meth)acrylic polymer (A) and silver particles (B). The (meth)acrylic polymer (A) has a glass transition temperature of 0 C., a weight average molecular weight of 500,000, and a hydroxyl value of more than 50 mgKOH/g. The silver particles (B) have a specific surface area of 0.5 to 3.0 m.sup.2/g, a 50% average particle diameter of 0.5 to 14.0 m, a maximum particle diameter of 8 m, and a solid content from 50 to 80% by mass. Another conductive ink composition contains a (meth)acrylic polymer (A) and carbon black (CB). The (meth)acrylic polymer (A) has a glass transition temperature of 0 C., a weight average molecular weight of 500,000, and a hydroxyl value of more than 50 mgKOH/g. The carbon black (CB) has a specific surface area of 50 m.sup.2/g, an aggregate diameter of 400 nm, and a solid content from 15 to 30% by mass.

A pressure detection element of a capacitive system includes a dielectric having two opposing surfaces including a first surface and a second surface, a conductor layer provided on the first surface of the dielectric, a conductive elastic member provided on the second surface of the dielectric, a spacer that positions the conductive elastic member at a predetermined distance from the second surface of the dielectric, and a pressing member configured to push the conductive elastic member toward the dielectric. An end surface of the pressing member that presses the conductive elastic member has a predetermined curvature, with an apex at a center of the end surface. A protrusion is provided at the apex at the center of the end surface of the pressing member.

A pressure detection element of a capacitive system includes a dielectric having two opposing surfaces including a first surface and a second surface, a conductor layer provided on the first surface of the dielectric, a conductive elastic member provided on the second surface of the dielectric, a spacer that positions the conductive elastic member at a predetermined distance from the second surface of the dielectric, and a pressing member configured to push the conductive elastic member toward the dielectric. An end surface of the pressing member that presses the conductive elastic member has a predetermined curvature, with an apex at a center of the end surface. A protrusion is provided at the apex at the center of the end surface of the pressing member.

A force sensing device comprises a sensing array comprising a first conductive layer having a plurality of conductive rows and a second conductive layer having a plurality of conductive columns. The plurality of conductive rows and plurality of conductive columns are arranged to define a plurality of intersections. The force sensing device also comprises an electro-active layer overlaying the first conductive layer and comprising a pressure sensitive element at each intersection. A force concentrating structure is positioned at each intersection on the second conductive layer.

A vehicle wheel with monitoring device, and a monitoring device, comprising a housing which is arranged rotatably with a rim part of the vehicle wheel, an electronic circuit which is arranged in the housing and is coupled to a load detection device arranged in the housing and having strain gauges for detecting forces acting on the vehicle wheel. In order to create a monitoring device which is easy to install on different vehicle wheels and which can reliably determine the load forces occurring on the vehicle wheel, the housing has two fastening zones which are spaced apart from one another and which are connected to one another via at least one bending strut connected to both fastening zones as a component of the load detection device, at least one pair of strain gauges being arranged on the bending strut between the fastening zones for detecting the bending of the bending strut caused by load forces.

A vehicle wheel with monitoring device, and a monitoring device, comprising a housing which is arranged rotatably with a rim part of the vehicle wheel, an electronic circuit which is arranged in the housing and is coupled to a load detection device arranged in the housing and having strain gauges for detecting forces acting on the vehicle wheel. In order to create a monitoring device which is easy to install on different vehicle wheels and which can reliably determine the load forces occurring on the vehicle wheel, the housing has two fastening zones which are spaced apart from one another and which are connected to one another via at least one bending strut connected to both fastening zones as a component of the load detection device, at least one pair of strain gauges being arranged on the bending strut between the fastening zones for detecting the bending of the bending strut caused by load forces.

A pressure-sensitive sensor includes a plurality of first-electrode cloths arranged at a first-interval on a first-surface of a conductive cloth and a plurality of second-electrode cloths arranged at a second-interval on a second-surface of the conductive cloth in a direction intersecting that of the first-electrode cloths. Areas of intersection between the first-electrode cloths and the second-electrode cloths are formed to have a matrix structure, first-conductive particles are applied to coat the conductive cloth, and second-conductive particles having greater electrical conductivity than the first-conductive particles are applied to coat the first-electrode cloths and the second-electrode cloths.

A pressure-sensitive sensor includes a plurality of first-electrode cloths arranged at a first-interval on a first-surface of a conductive cloth and a plurality of second-electrode cloths arranged at a second-interval on a second-surface of the conductive cloth in a direction intersecting that of the first-electrode cloths. Areas of intersection between the first-electrode cloths and the second-electrode cloths are formed to have a matrix structure, first-conductive particles are applied to coat the conductive cloth, and second-conductive particles having greater electrical conductivity than the first-conductive particles are applied to coat the first-electrode cloths and the second-electrode cloths.

A monitoring method is adapted for a circuit board. The circuit board includes a board body, a main circuit, and a standby circuit. The main circuit is located on the board body. The standby circuit is located on the board body, and is electrically connected to the main circuit. The standby circuit includes a first pressure detection circuit and a control circuit. The first pressure detection circuit is located at an area being monitored of the board body, and the control circuit outputs a first signal or a second signal according to a first detection value and a first predetermined range of the first pressure detection circuit.