Source: http://www.freshpatents.com/-dt20121122ptan20120294464.php
Timestamp: 2013-05-22 00:56:16
Document Index: 385917930

Matched Legal Cases: ['art 131', 'art 132', 'art 131', 'art 133', 'art 132', 'art 133', 'art 133', 'art 133', 'art 133', 'art 133', 'art 133']

Mems Microphone 7 views for this patent on FreshPatents.comupdated 05/17/13
Patents sorted by company.	11/22/12 | Class 381 Monitor | RSS | Browse: Prev - Next Mems microphone Abstract: A MEMS microphone includes a silicon substrate, a diaphragm connected to the silicon substrate, a backplate opposed from the diaphragm for forming an air gap. The backplate defines a plurality of first through holes and a plurality of second through holes surrounded by the first through holes, each of the first through holes being formed by a straight boundary and an arc boundary, the radius of the second boundary being greater than half the width of the first boundary.
Agent: Aac Acoustic Technologies (shenzhen) Co., Ltd. - Shenzhen, CA, CNUSPTO Applicaton #: #20120294464 - Class: 381174 (USPTO) - 11/22/12 - Class 381 Related Terms: Mems Microphone The Patent Description & Claims data below is from USPTO Patent Application 20120294464, Mems microphone.
The present disclosure relates to the art of microphones and, particularly to a MEMS microphone used in a portable device, such as a mobile phone.
Various microphone designs have been invented and conceptualized by using silicon micro-machining technology. Despite various structural configurations and materials, the silicon condenser microphone consists of four basic elements: a movable compliant diaphragm, a rigid and fixed backplate (which together form a variable air gap capacitor), a voltage bias source, and a pre-amplifier. These four elements fundamentally determine the performance of the condenser microphone. In pursuit of high performance; i.e., high sensitivity, low bias, low noise, and wide frequency range, the key design considerations are to have a large size of diaphragm and a large air gap. The former will help increase sensitivity as well as lower electrical noise, and the later will help reduce acoustic noise of the microphone. The large air gap requires a thick sacrificial layer. For releasing the sacrificial layer, the backplate is provided with a plurality of through holes. However, the through holes are unequally distributed in the backplate, which affects the releasing speed rate of the sacrificial layer and further affects the performance of the microphone.
Therefore, it is desirable to provide a MEMS microphone which can overcome the above-mentioned problems.
FIG. 1 is an isometric view of a micro-microphone in accordance with an exemplary embodiment of the present disclosure.
FIG. 2 is a cross-sectional view of the micro-microphone taken along line A-A in FIG. 1.
FIG. 3 is an illustration of a backplate of the MEMS microphone of the exemplary embodiment of the present disclosure.
FIG. 4 is an enlarged view of Part B in FIG. 3.
Referring to FIGS. 1 and 2, a MEMS microphone 10 includes a silicon substrate 11, a diaphragm 12 supported by the silicon substrate, and a backplate 13 opposite to the diaphragm 12. In the exemplary embodiment, the MEMS microphone 10 further defines a stopping layer 14 disposed on the silicon substrate 11. Both of the diaphragm 12 and the backplate 13 are anchored to the stopping layer 14. A cavity 140 is defined through the stopping layer 14 and the silicon substrate 11. For electrically separating the diaphragm 12 and the backplate 13, the diaphragm 12 is anchored to a relatively inner part of the stopping layer 14, and the backplate 13 is anchored to a relatively outer part of the stopping layer 14. The diaphragm 12 is insulated from the backplate 13 and comprises a plurality of leaking holes 120 therethrough. The backplate 13 defines a supporting part 131 anchored to the stopping layer 14, an extending part 132 extending upwardly from the supporting part 131, and a main part 133 extending from the extending part 132 and being opposite to the diaphragm 12. The main part 133 is opposite to the diaphragm 12 for forming an air gap 320 therebetween. The leaking holes 120 communicate the cavity 140 with the air gap 320.
Referring to FIGS. 3 and 4, the main part 133 of the backplate 13 comprises a plurality of first through holes 135 adjacent to the edge of the main part 133 and a plurality of second through holes 136 surrounded by the first through holes 135. The first through holes 135 are evenly distributed in the main part 133 with a constant distance between every two adjacent first through holes. Each of the first through holes 135 is same to the others. Further, a distance d is formed between each of the first through holes 135 and the edge of the main part 133.
The second through holes 136 are evenly distributed in the area surrounded by the first through holes 135.
Each of the first through holes 135 is formed by a first boundary 350 and a second boundary 351 connecting two ends of the first boundary 350. The first boundary 350 is spaced from the edge of the main part 133 for forming the distance d. The first boundary 350 is configured to be straight and the second boundary 351 is configured to be an arc. The first boundary 350 defines a width L and includes a middle point P. A longest distance between the middle point P and the second boundary 351 is greater than half of the width L. Another word, the second boundary 351 has a radius greater than half of the width L. And another word, the width L of the first boundary 350 is smaller than the diameter of the second boundary 351.
By virtue of the configuration described above, the sacrificial layer near the edge of the backplate can be fully released through the through holes defined in the main part of the backplate, which effectively improves the performance of the MEMS microphone.
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