Functional device, method of manufacturing the functional device, physical quantity sensor, and electronic apparatus
First Claim
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1. A functional device comprising:
- an insulating substrate that has a first recess and a peripheral ledge surrounding the first recess;
a second recess that is provided in a top surface of the peripheral ledge;
a fixed electrode that is provided on the insulating substrate; and
an electrode line that is provided in the second recess, the electrode line being electrically connected to the fixed electrode, whereinwhen a thickness of the electrode line is t and a depth of the second recess is d, the following relation is satisfied;
d>
t,the fixed electrode is connected to the electrode line via a conductive protrusion, anda sum of the thickness of the electrode line and a height of the conductive protrusion is equal to the depth of the second recess.
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Abstract
A functional device according to an embodiment of the invention includes: an insulating substrate; a movable section; movable electrode fingers provided in the movable section; and fixed electrode fingers provided on the insulating substrate and arranged to be opposed to the movable electrode fingers. The fixed electrode fingers include: first fixed electrode fingers arranged on one side of the movable electrode fingers; and second fixed electrode fingers arranged on the other side of the movable electrode fingers. The first fixed electrode fingers and the second fixed electrode fingers are arranged to be spaced apart from each other.
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Citations
18 Claims
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1. A functional device comprising:
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an insulating substrate that has a first recess and a peripheral ledge surrounding the first recess; a second recess that is provided in a top surface of the peripheral ledge; a fixed electrode that is provided on the insulating substrate; and an electrode line that is provided in the second recess, the electrode line being electrically connected to the fixed electrode, wherein when a thickness of the electrode line is t and a depth of the second recess is d, the following relation is satisfied;
d>
t,the fixed electrode is connected to the electrode line via a conductive protrusion, and a sum of the thickness of the electrode line and a height of the conductive protrusion is equal to the depth of the second recess. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A functional device comprising:
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an insulating substrate that has a first recess and a peripheral ledge surrounding the first recess; an insulating layer that is provided on the insulating substrate; a fixed electrode that is provided on the insulating substrate; a second recess that is provided in a top surface of the insulating substrate and the insulating layer; and an electrode line that is provided in the second recess, the electrode line being electrically connected to the fixed electrode, wherein when a thickness of the electrode line is t and a depth of the second recess is d, the following relation is satisfied;
d>
t,the fixed electrode is connected to the electrode line via a conductive protrusion, and a sum of the thickness of the electrode line and a height of the conductive protrusion is equal to the depth of the second recess. - View Dependent Claims (11, 12, 13, 14, 17, 18)
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15. A method of manufacturing a functional device comprising:
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forming a first recess in a first substrate so that a peripheral ledge of the first substrate surrounds the first recess; forming a second recess in a top surface of the peripheral ledge of the first substrate; forming an electrode line in the second recess; forming a conductive protrusion on the electrode line in the second recess; placing a second substrate on the top surface of the peripheral ledge in which the second recess is provided of the first substrate; and etching the second substrate to thereby form a fixed electrode on the first substrate, wherein when a thickness of the electrode line is t and a depth of the second recess is d, the following relation is satisfied;
d>
t,the fixed electrode is connected to the electrode line via the conductive protrusion, and a sum of the thickness of the electrode line and a height of the conductive protrusion is equal to the depth of the second recess.
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16. A method of manufacturing a functional device comprising:
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forming a first recess in a first substrate so that a peripheral ledge of the first substrate surrounds the first recess; forming an insulating layer on a top surface of the peripheral ledge of the first substrate; forming a second recess in the top surface of the peripheral ledge of the first substrate and the insulating layer; forming an electrode line in the second recess; forming a conductive protrusion on the electrode line in the second recess; placing a second substrate on the top surface of the peripheral ledge in which the second recess is provided of the first substrate; and etching the second substrate to thereby form a fixed electrode on the first substrate, wherein when a thickness of the electrode line is t and a depth of the second recess is d, the following relations are satisfied;
d>
t,the fixed electrode is connected to the electrode line via the conductive protrusion, and a sum of the thickness of the electrode line and a height of the conductive protrusion is equal to the depth of the second recess.
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Specification