Method for manufacturing acceleration sensing unit

1. A method for manufacturing an acceleration sensing unit, comprising:

a) providing an element support substrate in which a plurality of element supporting members is arranged so as to form a plane, each of the element supporting members being coupled to the other element supporting member through a supporting part and having a fixed part and a movable part that is supported by the fixed part through a beam, the beam having a flexibility with which the movable part is displaced along an acceleration detection axis direction when an acceleration is applied to the movable part;

b) providing an stress sensing element substrate in which a plurality of stress sensing elements is arranged so as to form a plane, each of the stress sensing elements being coupled to the other stress sensing element through an element supporting part and having a stress sensing part and fixed ends that are formed so as to have a single body with the stress sensing part at both ends of the stress sensing part;

c) disposing the stress sensing element substrate on the element support substrate such that the fixed ends of each stress sensing element are situated on the fixed part and the movable part;

d) fixing the fixed ends onto the fixed part and the movable part, and

e) dividing the element supporting part and the supporting part.

2. The method for manufacturing an acceleration sensing unit according to claim 1 , wherein in the step c), the stress sensing element is placed over the supporting part.

3. A method for manufacturing an acceleration sensing unit, comprising:

a) providing an element support substrate in which a plurality of element supporting members is arranged so as to form a plane, each of the element supporting members being coupled to the other element supporting member through a supporting part and having a fixed part and a movable part that is supported by the fixed part through a beam, the beam having a flexibility with which the movable part is displaced along an acceleration detection axis direction when an acceleration is applied to the movable part;

b) providing at least a single weight part support substrate in which a plurality of weight parts is arranged so as to form a plane, each of the weight parts being coupled to the other weight part through a weight-part supporting part;

c) providing a stress sensing element substrate in which a plurality of stress sensing elements is arranged so as to form a plane, each of the stress sensing elements being coupled to the other stress sensing element through an element supporting part and having a stress sensing part and fixed ends that are formed so as to have a single body with the stress sensing part at both ends of the stress sensing part;

d) forming a substrate-layered structure by disposing the weight part support substrate on the element support substrate in order to couple at least the weight part with the movable part;

e) dividing the weight-part supporting part;

f) disposing the stress sensing element substrate onto the substrate-layered structure in order to couple the fixed ends of each stress sensing element with the substrate-layered structure; and

g) dividing the element supporting part and the supporting part.

4. A method for manufacturing an acceleration sensing unit, comprising:

a) providing an element support substrate in which a plurality of element supporting members is arranged so as to form a plane, each of the element supporting members being coupled to the other element supporting member through a supporting part and having a fixed part and a movable part that is supported by the fixed part through a beam, the beam having a flexibility with which the movable part is displaced along an acceleration detection axis direction when an acceleration is applied to the movable part;

b) providing a stress sensing element substrate in which a plurality of stress sensing elements is arranged so as to form a plane, each of the stress sensing elements being coupled to the other stress sensing element through an element supporting part and having a stress sensing part and fixed ends that are formed so as to have a single body with the stress sensing part at both ends of the stress sensing part;

c) providing at least a single weight part support substrate in which a plurality of weight parts is arranged so as to form a plane, each of the weight parts being coupled to the other weight part through a weight-part supporting part;

d) forming a substrate-layered structure by disposing the weight part support substrate on the element support substrate in order to couple at least the weight part with the movable part;

e) disposing the stress sensing element substrate on the substrate-layered structure in order to couple the fixed ends of each stress sensing element with the substrate-layered structure; and

f) dividing the supporting part, the weight-part supporting part and the element supporting part.

5. The method for manufacturing an acceleration sensing unit according to claim 3 further comprising: forming concave parts in the supporting part, the element supporting part and the weight-part supporting part.

6. The method for manufacturing an acceleration sensing unit according to claim 5 , wherein the concave part provided in the supporting part is formed along a thickness direction of the stress sensing element substrate, and the concave parts provided in the element supporting part and the weight-part supporting part are formed so as to extend in a depth direction of the concave part provided in the supporting part.