Patent ID: 7617723

Claim:
A thermal type flow rate measuring apparatus, comprising: a heat-generating element disposed in the flow of a fluid that generates heat when electric current flows therethrough; first and second temperature-detecting elements disposed on both sides of the heat-generating element along the flow of the fluid; a heat-generating element connecting terminal electrically connected to the heat-generating element; first and second temperature-detecting element connecting terminals electrically connected to the first and second temperature-detecting elements; a heat-generating element wiring portion electrically connecting the heat-generating element and the heat-generating element connecting terminal; and first and second temperature-detecting element wiring portions electrically connecting the first and second temperature-detecting elements and the first and second temperature-detecting element connecting terminals, respectively, the apparatus further comprising: a wiring pattern disposed between the heat-generating element wiring portion and the first and second temperature-detecting element wiring portions, wherein the wiring pattern is held at a constant potential; a heat-generating element temperature-detecting element disposed near the heat-generating element for detecting the temperature of the heat-generating element; a heat-generating element temperature-detecting element connecting terminal electrically connected with the heat-generating element temperature-detecting element; a heat-generating element temperature-detecting element wiring portion electrically connecting the heat-generating element temperature-detecting element with the heat-generating element temperature-detecting element connecting terminal; and a wiring pattern disposed between the heat-generating element wiring portion and the heat-generating element temperature-detecting element wiring portion, wherein the wiring pattern is held at a constant potential.