Patent ID: 7914877

Claim:
A sintered thin plate member that comprises at least a ceramic sheet, having a uniform thickness of not less than 5 μm and not more than 100 μm, and includes plural convex portions protruding from a plane of the thin plate member and plural concave portions caved in from said plane, wherein at least one of the plural convex portions is formed such that a top positioned at the uppermost point of the convex portion continuously extends in the direction along said plane and directly joins an adjacent one of the plural concave portions, which is formed such that a bottom positioned at an uppermost point of the concave portion continuously extends in the direction along said plane, wherein a top-bottom average distance, which is a sum of the top distance average value obtained by simply averaging the distances from the tops positioned at the uppermost point of the plural convex portions to said plane and a bottom distance average value obtained by simply averaging the distances from the bottoms positioned at the uppermost point of the plural concave portions to said plane, is not less than 20 μm and not more than 400 μm, including at least a pair of the convex portion and concave portion, which is composed of one of the plural convex portions and one of the plural concave portions adjacent to the one convex portion, in which the distance between the top of the one convex portion and the bottom of the one concave portion in the direction along the plane is not less than 0.05 mm and not more than 1.00 mm, and a deflection amount obtained when the thin plate member is supported at a predetermined support section of the thin plate member and a load having a predetermined magnitude is applied to a load applying section, which is other than the support section, of the thin plate member in a direction orthogonal to said plane is smaller than a deflection amount obtained when the thin plate member, which is supposed to be flat without having the convex portion and the concave portion, is supported at the support section thereof and the load having the predetermined magnitude is applied to the load applying section of the supposed thin plate member in the direction orthogonal to the plane.