Patent ID: 7555944

Claim:
A physical quantity sensor, comprising: a substrate; a rectangular diaphragm formed in said substrate; and resistors for measuring a physical quantity constituting a voltage generated on said resistors, said resistors being formed on an electric insulating film on said diaphragm in a pattern of strips, said resistors including a horizontal resistor component and a vertical resistor component, and said horizontal resistor component and said vertical resistor component being orthogonal with each other, wherein a ratio of a piezoresistance coefficient of the vertical resistor component to a piezoresistance coefficient of the horizontal resistor component is substantially equal to a resistance value ratio of the resistance value of the vertical resistor component to a resistance value of the horizontal resistor component, said piezoresistance coefficient of said vertical resistor component being obtained by imposing a stress to said vertical resistor component in a vertical direction, said piezoresistance coefficient of the horizontal resistor component is obtained by imposing a stress to said horizontal resistor component in a horizontal direction.