Micro electro mechanical system
First Claim
1. A micro electro mechanical system comprising a sensor element,the sensor element including:
- a movable body displaceable in a predetermined displacement direction;
a first spring system having a first fixed portion fixed to the substrate, a first turning portion, an elastically deformable first beam connected at one end to the first fixed portion and at another end to the first turning portion, an elastically deformable second beam connected at one end to the first turning portion and at another end to the movable body, and an elastically deformable third beam connected at one end to the first turning portion and at another end to the movable body; and
a second spring system having a second fixed portion fixed to the substrate, a second turning portion, an elastically deformable fourth beam connected at one end to the second fixed portion and at another end to the second turning portion, an elastically deformable fifth beam connected at one end to the second turning portion and at another end to the movable body, and an elastically deformable sixth beam connected at one end to the second turning portion and at another end to the movable body,wherein the first to sixth beams extend in a perpendicular direction perpendicular to the displacement direction, andwhen a straight line passing through a center of the sensor element in the perpendicular direction and extending in the displacement direction is defined as a center line, the first fixed portion and the second fixed portion are disposed on opposite sides with respect to the center line.
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Accused Products
Abstract
In order to provide a technology capable of suppressing degradation of measurement accuracy due to fluctuation of detection sensitivity of an MEMS by suppressing fluctuation in natural frequency of the MEMS caused by a stress, first, fixed portions 3a to 3d are displaced outward in a y-direction of a semiconductor substrate 2 by deformation of the semiconductor substrate 2. Since a movable body 5 is disposed in a state of floating above the semiconductor substrate 2, it is not affected and displaced by the deformation of the semiconductor substrate 2. Therefore, a tensile stress (+σ1) occurs in the beam 4a and a compressive stress (−σ2) occurs in the beam 4b. At this time, in terms of a spring system made by combining the beam 4a and the beam 4b, increase in spring constant due to the tensile stress acting on the beam 4a and decrease in spring constant due to the compressive stress acting on the beam 4b are offset against each other.
42 Citations
11 Claims
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1. A micro electro mechanical system comprising a sensor element,
the sensor element including: -
a movable body displaceable in a predetermined displacement direction; a first spring system having a first fixed portion fixed to the substrate, a first turning portion, an elastically deformable first beam connected at one end to the first fixed portion and at another end to the first turning portion, an elastically deformable second beam connected at one end to the first turning portion and at another end to the movable body, and an elastically deformable third beam connected at one end to the first turning portion and at another end to the movable body; and a second spring system having a second fixed portion fixed to the substrate, a second turning portion, an elastically deformable fourth beam connected at one end to the second fixed portion and at another end to the second turning portion, an elastically deformable fifth beam connected at one end to the second turning portion and at another end to the movable body, and an elastically deformable sixth beam connected at one end to the second turning portion and at another end to the movable body, wherein the first to sixth beams extend in a perpendicular direction perpendicular to the displacement direction, and when a straight line passing through a center of the sensor element in the perpendicular direction and extending in the displacement direction is defined as a center line, the first fixed portion and the second fixed portion are disposed on opposite sides with respect to the center line. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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2. A micro electro mechanical system comprising:
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a substrate; a movable body displaceable in a predetermined displacement direction; a first spring system having a first fixed portion fixed to the substrate, a first turning portion, an elastically deformable first beam connected at one end to the first fixed portion and at another end to the first turning portion, an elastically deformable second beam connected at one end to the first turning portion and at another end to the movable body, and an elastically deformable third beam connected at one end to the first turning portion and at another end to the movable body; and a second spring system having a second fixed portion fixed to the substrate, a second turning portion, an elastically deformable fourth beam connected at one end to the second fixed portion and at another end to the second turning portion, an elastically deformable fifth beam connected at one end to the second turning portion and at another end to the movable body, and an elastically deformable sixth beam connected at one end to the second turning portion and at another end to the movable body, wherein the first to sixth beams extend in a perpendicular direction perpendicular to the displacement direction, and when the substrate is deformed, the first fixed portion and the second fixed portion are displaced in opposite directions.
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3. A micro electro mechanical system comprising a sensor element,
the sensor element including: -
a movable body displaceable in a predetermined displacement direction; a first spring system having a first fixed portion fixed to the substrate, a first turning portion, an elastically deformable first beam connected at one end to the first fixed portion and at another end to the first turning portion, an elastically deformable second beam connected at one end to the first turning portion and at another end to the movable body, and an elastically deformable third beam connected at one end to the first turning portion and at another end to the movable body; and a second spring system having a second fixed portion fixed to the substrate, a second turning portion, an elastically deformable fourth beam connected at one end to the second fixed portion and at another end to the second turning portion, an elastically deformable fifth beam connected at one end to the second turning portion and at another end to the movable body, and an elastically deformable sixth beam connected at one end to the second turning portion and at another end to the movable body, wherein the first to sixth beams extend in a perpendicular direction perpendicular to the displacement direction, and when a straight line passing through a center of the sensor element in the perpendicular direction and extending in the displacement direction is defined as a center line, the first fixed portion and the second fixed portion are disposed at positions sandwiching the center line.
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Specification