Pressure sensor

A pressure sensor comprising:

• first and second base films;
• a pair of electrodes, which are located between the base films;
• a layer of pressure-sensitive resistor, which is located between the base films to be distant from one of the electrodes by a predetermined gap;
• a spacer, which is located outside the layer of pressure-sensitive resistor between the base films and used for forming the gap;
• and
• a reinforcing sheet, which is made of a material having a rigidity or a elastic modulus equal to or higher than the base films and located on an outer surface of the second base film such that a deformability of the first base film when a pressure acts on the first base film becomes substantially constant irrespective of specifications of an article in which the pressure sensor is placed, wherein a contact state between the layer of pressure-sensitive resistor and one of the electrodes varies in response to the pressure to vary a resistance between the electrodes.

A pressure sensor comprising:

• first and second base films;
• a plurality of electrodes, which are located between the base films;
• a layer of pressure-sensitive resistor, which is located between the base films to be distant from one of the electrodes by a predetermined gap;
• and
• a spacer, which is located outside the layer of pressure-sensitive resistor between the base films and used for forming the gap,
• wherein the second base film has a rigidity or an elastic modulus higher than the first base film such that a deformability of the first base film when a pressure acts on the first base film becomes substantially constant irrespective of specifications of an article in which the pressure sensor is placed and wherein a contact state between the layer of pressure-sensitive resistor and one of the electrodes varies in response to the pressure to vary a resistance between the electrodes.