Technical Field
The present disclosure relates to a method of manufacturing bistable strips having different curvatures.
Discussion of the Related Art
FIG. 1 corresponds to FIG. 2D of French patent application 2988911 filed on Apr. 3, 2012 (B11532), also published in 2013/0280549, which is hereby incorporated by reference in its entirety. FIG. 1 is a cross-section view of a curved bimetal strip at a step of its manufacturing. On a substrate 1, for example, a silicon substrate, blocks 3 are formed, having layers of different materials, for example, metallic materials 5 and 7 forming a bimetal, deposited thereon. Bimetal portions, corresponding to portions of layers 5 and 7 resting on blocks 3, are then cut to form the desired curved strips. Typically, the blocks 3 are removed.
Such a manufacturing method comprises two steps. In a first step, blocks defining the curvature of the curved strips are formed and in a second step, the layers of materials forming the bimetal are deposited.
The block manufacturing method does not enable to accurately control the block curvature. Further, manufacturing batches containing a plurality of bimetals with different bimetal curvatures from one batch to another is difficult.