Acoustic transducer
First Claim
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1. An acoustic transducer, comprising:
- a substrate;
a chamber in the substrate;
a first flexible electrode suspended above the chamber, the first electrode including;
a first rectangular portion having a first area;
a second rectangular portion having a second area, the second area being smaller than the first area, the second rectangular portion extending from a first side of the first rectangular portion and the second rectangular portion being separated from the first rectangular portion by a first thin opening;
a plurality of anchors that couple the first flexible electrode to the substrate; and
a fixed membrane coupled to the substrate, the fixed membrane overlying the first flexible electrode, the fixed membrane including;
a first fixed electrode positioned over the first rectangular portion, having a third area; and
a second fixed electrode that is electrically isolated from the first fixed electrode and is positioned over the second rectangular portion, the second fixed electrode having a fourth area that is smaller than the third area.
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Abstract
Provided is an acoustic transducer including: a semiconductor substrate; a vibrating membrane provided above the semiconductor substrate, including a vibrating electrode; and a fixed membrane provided above the semiconductor substrate, including a fixed electrode, the acoustic transducer detecting a sound wave according to changes in capacitances between the vibrating electrode and the fixed electrode, converting the sound wave into electrical signals, and outputting the electrical signals. At least one of the vibrating electrode and the fixed electrode is divided into a plurality of divided electrodes, and the plurality of divided electrodes outputting the electrical signals.
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Citations
18 Claims
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1. An acoustic transducer, comprising:
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a substrate; a chamber in the substrate; a first flexible electrode suspended above the chamber, the first electrode including; a first rectangular portion having a first area; a second rectangular portion having a second area, the second area being smaller than the first area, the second rectangular portion extending from a first side of the first rectangular portion and the second rectangular portion being separated from the first rectangular portion by a first thin opening; a plurality of anchors that couple the first flexible electrode to the substrate; and a fixed membrane coupled to the substrate, the fixed membrane overlying the first flexible electrode, the fixed membrane including; a first fixed electrode positioned over the first rectangular portion, having a third area; and a second fixed electrode that is electrically isolated from the first fixed electrode and is positioned over the second rectangular portion, the second fixed electrode having a fourth area that is smaller than the third area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An acoustic transducer, comprising:
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a substrate; a chamber in the substrate; a first flexible electrode suspended above the chamber, the first electrode including; a first rectangular portion having a first area; a second rectangular portion having a second area, the second area being smaller than the first area, the second rectangular portion extending from a first side of the first rectangular portion and the second rectangular portion being separated from the first rectangular portion by a first thin opening; a plurality of anchors that couple the first electrode to the substrate, wherein the first thin opening only partially separates the first rectangular portion from the second rectangular portion, the first thin opening having curved ends, a first curved end being positioned adjacent to a first one of the plurality of anchors and a second curved end being positioned adjacent to a second one of the plurality of anchors; and a fixed membrane coupled to the substrate, overlying to the first electrode, the fixed membrane including; a first fixed electrode positioned over the first rectangular portion, the first fixed electrode having a third area; and a second fixed electrode positioned over the second rectangular portion, the second fixed electrode having a fourth area that is smaller than the third area. - View Dependent Claims (14)
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15. An acoustic transducer, comprising:
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a substrate; a chamber in the substrate; a first membrane suspended above the chamber, the first membrane including; a first fixed electrode positioned at a first region having a first area; a second fixed electrode positioned at a second region having a second area, the second area being smaller than the first area, the second region extending from a first side of the first region and the second region being separated from the first region; an electrically insulating member positioned between the first and second fixed electrodes to physically separate and electrically isolate the first and second fixed electrodes from each other; and a second membrane that is flexible and is above the chamber, the second membrane including a third flexible electrode, the third flexible electrode including; a first portion having a first area; and a second portion having a second area, the second area being smaller than the first area, the second portion extending from a first side of the first portion and the second portion being separated from the first portion. - View Dependent Claims (16, 17, 18)
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Specification