Patent ID: 9194682
Filing Date: 2015-11-24
Classification: F42C

Abstract:
1. A micro electro-mechanical safety and arming device for a projectile, the device comprising: a bottom substrate layer; a top substrate layer; and at least intermediate substrate layer incorporating at least one cuboid mobile part; wherein: said bottom layer includes a plurality of raised patterns configured to come into contact with a first face of the mobile part and said top layer includes a plurality of raised patterns configured to come into contact with a second face of the mobile part; said raised patterns are arranged such that for each position of the mobile part, multiple raised patterns among the plurality of raised patterns of the bottom layer are in contact with said first face of the mobile part, while simultaneously multiple raised patterns among the plurality of raised patterns of the top layer are in contact with said second face of the mobile part; said first face and second face are both external flat planar surfaces on opposite sides of the mobile part such that a normal direction of the first face is opposite of a normal direction of the second face; said plurality of raised patterns of said bottom layer are evenly spaced over said bottom layer and said plurality of raised patterns of said top layer are evenly spaced over said top layer such that for each position of said mobile part, said mobile part is held stably between said plurality of raised patterns of said bottom layer and said plurality of raised patterns of said top layer while movement of the mobile part is guided along the plurality of raised patterns of said bottom and top layers; and wherein the amount of surface area of the first and second faces of the mobile part in contact with the plurality of raised patterns of the bottom and top layers, respectively, is less than the total surface area of the first and second faces of the mobile part, such that the surfaces of the first and second faces which are not in contact with the plurality of raised patterns of the bottom and top layers, respectively, are also not in contact with the bottom and top layers in order to prevent adhesion resulting from friction between the mobile part and the bottom and top layers.