Patent ID: 8646153

Claim:
A hinge mechanism, comprising: a shaft part forming a rotary shaft; a base part pivotally supporting the shaft part, and having one of a recess and a boss on a circumference around the rotating shaft for click engagement; a plate spring fastened to the shaft part for rotating integrally with said shaft part, said plate spring including a plate spring portion having the other of the recess and the boss to be selectively fitted into the one of the recess and boss for click engagement; a stress relief portion holding the plate spring portion between the stress relief portion and the base part, and pressing the plate spring portion against the base part, and wherein the plate spring is folded back along a fold portion to form the plate spring portion and the stress relief portion such that the plate spring portion and the stress relief portion tightly press against each other, and one of the plate spring portion and the stress relief portion is fastened to the shaft part by caulking.