STRAIN AND PRESSURE SENSING DEVICE, MICROPHONE, METHOD FOR MANUFACTURING STRAIN AND PRESSURE SENSING DEVICE, AND METHOD FOR MANUFACTURING MICROPHONE
First Claim
1. A strain and pressure sensing device, comprising:
- a semiconductor circuit unit including a semiconductor substrate and a transistor provided on the semiconductor substrate; and
a sensing unit provided on the semiconductor circuit unit,the sensing unit havinga space portion and a non-space portion, the space portion being provided above the transistor, the non-space portion being juxtaposed with the space portion in a plane parallel to a surface of the semiconductor substrate with the transistor provided;
the sensing unit further including;
a movable beam having;
a fixed portion fixed to the non-space portion; and
a movable portion separated from the transistor and extending from the fixed portion into the space portion, a distance between the transistor and the movable portion being changeable, the movable beam includinga first interconnect layer; and
a second interconnect layer extending from the fixed portion toward the movable portion,a strain sensing element unit fixed to the movable portion, one end of the strain sensing element unit being electrically connected to the first interconnect layer, one other end of the strain sensing element unit being electrically connected to the second interconnect layer, the strain sensing element unit including a first magnetic layer,a first buried interconnect provided in the non-space portion to electrically connect the first interconnect layer with the semiconductor circuit unit,a second buried interconnect being provided in the non-space portion to electrically connect the second interconnect layer with the semiconductor circuit unit.
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Accused Products
Abstract
According to one embodiment, a strain and pressure sensing device includes a semiconductor circuit unit and a sensing unit. The semiconductor circuit unit includes a semiconductor substrate and a transistor. The transistor is provided on a semiconductor substrate. The sensing unit is provided on the semiconductor circuit unit, and has space and non-space portions. The non-space portion is juxtaposed with the space portion. The sensing unit further includes a movable beam, a strain sensing element unit, and first and second buried interconnects. The movable beam has fixed and movable portions, and includes first and second interconnect layers. The fixed portion is fixed to the non-space portion. The movable portion is separated from the transistor and extends from the fixed portion into the space portion. The strain sensing element unit is fixed to the movable portion. The first and second buried interconnects are provided in the non-space portion.
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Citations
22 Claims
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1. A strain and pressure sensing device, comprising:
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a semiconductor circuit unit including a semiconductor substrate and a transistor provided on the semiconductor substrate; and a sensing unit provided on the semiconductor circuit unit, the sensing unit having a space portion and a non-space portion, the space portion being provided above the transistor, the non-space portion being juxtaposed with the space portion in a plane parallel to a surface of the semiconductor substrate with the transistor provided; the sensing unit further including; a movable beam having; a fixed portion fixed to the non-space portion; and a movable portion separated from the transistor and extending from the fixed portion into the space portion, a distance between the transistor and the movable portion being changeable, the movable beam including a first interconnect layer; and a second interconnect layer extending from the fixed portion toward the movable portion, a strain sensing element unit fixed to the movable portion, one end of the strain sensing element unit being electrically connected to the first interconnect layer, one other end of the strain sensing element unit being electrically connected to the second interconnect layer, the strain sensing element unit including a first magnetic layer, a first buried interconnect provided in the non-space portion to electrically connect the first interconnect layer with the semiconductor circuit unit, a second buried interconnect being provided in the non-space portion to electrically connect the second interconnect layer with the semiconductor circuit unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A microphone, comprising:
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a semiconductor circuit unit including a semiconductor substrate and a transistor provided on the semiconductor substrate; and a sensing unit provided on the semiconductor circuit unit, the sensing unit having a space portion and a non-space portion, the space portion being provided above the transistor, the non-space portion being juxtaposed with the space portion in a plane parallel to a surface of the semiconductor substrate with the transistor provided; the sensing unit further including; a movable beam having; a fixed portion fixed to the non-space portion; and a movable portion separated from the transistor and extending from the fixed portion into the space portion, a distance between the transistor and the movable portion being changeable, the movable beam including a first interconnect layer; and a second interconnect layer extending from the fixed portion toward the movable portion, a strain sensing element unit fixed to the movable portion, one end of the strain sensing element unit being electrically connected to the first interconnect layer, one other end of the strain sensing element unit being electrically connected to the second interconnect layer, the strain sensing element unit including a first magnetic layer, a first buried interconnect provided in the non-space portion to electrically connect the first interconnect layer with the semiconductor circuit unit, a second buried interconnect being provided in the non-space portion to electrically connect the second interconnect layer with the semiconductor circuit unit.
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20. A method for manufacturing a strain and pressure sensing device, comprising:
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forming a transistor on a semiconductor substrate; forming an inter-layer insulating layer on the semiconductor substrate and forming a sacrificial layer on the transistor; forming a first conductive layer used to form a first interconnect layer on the inter-layer insulating layer and the sacrificial layer; forming a strain sensing element unit including a first magnetic layer on the first conductive layer on the sacrificial layer; forming a second conductive layer used to form a second interconnect layer on the strain sensing element unit; forming a first buried interconnect and a second buried interconnect inside the inter-layer insulating layer, the first buried interconnect electrically connecting the first conductive layer with the semiconductor substrate, the second buried interconnect electrically connecting the second conductive layer with the semiconductor substrate; and removing the sacrificial layer. - View Dependent Claims (21)
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22. A method for manufacturing a microphone, comprising:
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forming a transistor on a semiconductor substrate; forming an inter-layer insulating layer on the semiconductor substrate and forming a sacrificial layer on the transistor; forming a first conductive layer used to form a first interconnect layer on the inter-layer insulating layer and the sacrificial layer; forming a strain sensing element unit including a first magnetic layer on the first conductive layer on the sacrificial layer; forming a second conductive layer used to form a second interconnect layer on the strain sensing element unit; forming a first buried interconnect and a second buried interconnect inside the inter-layer insulating layer, the first buried interconnect electrically connecting the first conductive layer with the semiconductor substrate, the second buried interconnect electrically connecting the second conductive layer with the semiconductor substrate; and removing the sacrificial layer.
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Specification