CN101799344B - 硅压力传感器的封装结构 - Google Patents

硅压力传感器的封装结构 Download PDF

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CN101799344B
CN101799344B CN201010156192.7A CN201010156192A CN101799344B CN 101799344 B CN101799344 B CN 101799344B CN 201010156192 A CN201010156192 A CN 201010156192A CN 101799344 B CN101799344 B CN 101799344B
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pressure sensing
silicon chip
sensing silicon
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CN101799344A (zh
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周敬训
沈蓉蓉
常军
郑金荣
王智
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Wuxi Laidun Electronics Co Ltd
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Priority to PCT/CN2011/070528 priority patent/WO2011131045A1/zh
Priority to KR1020127029137A priority patent/KR101482720B1/ko
Priority to EP11771498.0A priority patent/EP2562524A4/en
Priority to US13/641,870 priority patent/US8704318B2/en
Priority to JP2013505309A priority patent/JP2013525766A/ja
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/14Housings
    • G01L19/145Housings with stress relieving means
    • G01L19/146Housings with stress relieving means using flexible element between the transducer and the support
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/14Housings
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/0061Electrical connection means
    • G01L19/0069Electrical connection means from the sensor to its support
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/06Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/02Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
    • G01L9/04Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of resistance-strain gauges
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805Shape
    • H01L2224/4809Loop shape
    • H01L2224/48091Arched

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • Measuring Fluid Pressure (AREA)
  • Pressure Sensors (AREA)

Abstract

一种硅压力传感器的封装结构,包括盖板和底座,两者相互连接并形成中部空腔,在所述中部空腔内设置有密封垫和压力传感硅片,密封垫衬在压力传感硅片下方,压力传感硅片的焊盘通过盖板与外电路连接。本发明简化了封装结构及生产工艺,材料及工艺成本均大幅度降低,并且具备防过载能力。

Description

硅压力传感器的封装结构
技术领域
本发明涉及压力传感器,特别涉及硅压力传感器的封装结构。
背景技术
压力传感器通常被使用和配置在需要对压力变化进行检测和响应的地方。如汽车、航空航天、商业、工业等多种应用场合中。
利用硅MEMS(微电子机械系统)技术制造的敏感元件是压力传感器的核心元件,敏感元件的封装结构对于压力传感器的性能有重要影响。现有的对于介质为腐蚀性气体或液体的敏感元件封装结构如图1所示,首先将用MEMS技术加工好的硅片107(即敏感元件)与玻璃底座108键合在一起后粘结在壳体109内腔,接着将引线柱102用玻璃粉103烧结在壳体109的引线孔内,用金线104将硅片107上的焊盘和引线柱102的一端焊接,引线柱102的另一端连接一块PCB板101,在壳体109内腔充硅油105,最后焊接波纹膜片106。
采用这样的封装结构,一旦腐蚀性介质接触波纹膜片106,就会通过硅油105将压力传递到硅片107上,从而在实现压力传递的同时达到防腐蚀的目的。但是该封装的结构和生产工艺复杂,成本较高,难以满足硅压力传感器的批量生产和应用。
发明内容
针对现有封装结构和生产工艺复杂、成本较高等缺点,申请人经过研究改进,提供一种新型的硅压力传感器的封装结构,简化了结构及生产工艺,材料及工艺成本均大幅度降低,并且具备了防过载能力。
本发明的技术方案如下:
一种硅压力传感器的封装结构,包括盖板和底座,两者相互连接并形成中部空腔,在所述中部空腔内设置有密封垫和压力传感硅片,密封垫衬在压力传感硅片下方,压力传感硅片的焊盘通过盖板与外电路连接。
可选的技术方案一:所述盖板上对应压力传感硅片焊盘的位置有贯通小孔,所述小孔内填充有导电胶。
可选的技术方案二:所述盖板上对应压力传感硅片焊盘的位置有贯通小孔,所述小孔的孔壁及上下边缘设置有导电层。
可选的技术方案三:所述盖板上对应压力传感硅片焊盘的位置有贯通小孔,所述小孔的孔壁及上下边缘设置有导电层,所述小孔内填充有导电胶。
可选的技术方案四:所述盖板内设置有贯穿的导线,压力传感硅片的焊盘与所述导线连接。
其进一步的技术方案是:所述盖板顶层制作有电路,所述电路与信号调理芯片电气连接。
以及,其进一步的技术方案是:所述压力传感硅片顶部与盖板底部之间设置有支撑垫,所述支撑垫设置在压力传感硅片顶部或盖板底部,并位于压力传感硅片中心应变区的外围。
以及,其进一步的技术方案是:所述密封垫由柔性材料制成。
本发明的有益技术效果是:
(1)本发明由于取消了键合工艺,也不需要充硅油和用波纹膜片隔离,简化了封装结构及生产工艺,材料及工艺成本均大幅度降低。
(2)本发明在盖板顶层制成电路,同时具有PCB基板功能,与信号调理芯片实现电气连接,方便制成具有标准信号输出的压力变送模块。
(3)本发明采用柔性的密封垫,使得压力传感硅片在陶瓷腔体内处于浮动状态,避免了刚性封装导致的封装应力。
(4)压力传感硅片顶部周边或盖板底部有一定厚度的支撑垫,能够起到防止压力传感硅片损坏的目的,并且可以抵抗十倍以上的压力过载,具备防过载能力。
附图说明
图1是现有硅压力传感器的封装结构剖视示意图。
图2是本发明实施例一的剖视示意图。
图3是本发明实施例二的剖视示意图。
图4是本发明实施例三的剖视示意图。
图5是本发明实施例四的剖视示意图。
图6是本发明实施例五的剖视示意图。
图7是本发明实施例六的剖视示意图,。
图8是支撑垫形状和位置的放大示意图,从压力传感硅片的顶部俯视。
注:图2至图7从图8的A-A方向剖视。
具体实施方式
以下结合附图,通过实施例对本发明进行具体说明。
实施例一:
图2是本发明实施例一的示意图。如图2所示,盖板201和底座202粘结在一起作为载体,并形成中部空腔,空腔内安放密封垫203和压力传感硅片204,密封垫203衬在压力传感硅片204下方。压力传感硅片204的焊盘通过盖板201与外电路进行连接。其可选的实施方式是,盖板201上对应压力传感硅片204的焊盘的位置预制有贯通小孔,用导电胶205填充在小孔内,从而将焊盘的信号引出至盖板201的顶层,再与外电路连接。本发明的密封垫203为柔性材料制成(如橡胶),使压力传感硅片204在空腔内处于浮动状态,避免了刚性封装导致的封装应力。
实施例二:
如图3所示,其可选的实施方式是,盖板201上对应压力传感硅片204焊盘的位置预制有贯通小孔,小孔的孔壁及上下边缘设置有导电层206。通过导电层206将焊盘的信号引出至盖板201的顶层,再与外电路连接。
实施例三:
如图4所示,其可选的实施方式是,盖板201上对应压力传感硅片204焊盘的位置预制有贯通小孔,小孔的孔壁及上下边缘设置有导电层206,并在贯穿小孔内填充导电胶205,通过导电层206和导电胶205将焊盘的信号引出至盖板201的顶层,再与外电路连接。
实施例四:
如图5所示,其可选的实施方式是,盖板201内设置有贯穿的导线207,导线207的两端连接导电片,压力传感硅片204的焊盘与导线207一端的导电片连接,通过导电片及导线207将焊盘的信号引出至盖板201的顶层,再与外电路连接。
在上述4种实施例的基础上,还可以有以下进一步的实施方案。
实施例五:
如图6所示,其进一步可优选的实施方式是,盖板201顶层用厚膜或薄膜工艺制成电路,同时具备PCB基板功能,与信号调理芯片208实现电气连接,如此制成具有标准信号输出的硅压力传感器的封装结构。
实施例六:
如图7、图8所示,其进一步可优选的实施方式是,压力传感硅片204顶部与盖板201之间设置有支撑垫209。支撑垫209可以设置在压力传感硅片204顶部,也可以设置在盖板201底部,还可以在压力传感硅片204顶部以及盖板201底部均设置支撑垫209,支撑垫209设置在压力传感硅片204中心应变区210以外的区域。支撑垫209的形状和位置在保证支撑效果的前提下可以按设计要求选择,如支撑垫209可以设置于压力传感硅片204顶部的四个角上,支撑垫209同时又可以是压力传感硅片204的焊盘。支撑垫209可以用现有厚膜或薄膜工艺直接附着在压力传感硅片204的顶部或盖板201的底部。此处由于设置了支撑垫209,图7中的盖板201无需像图2至图6般在传感硅片204顶部相应部位开孔。
支撑垫209能够使压力传感硅片204中心应变区210和盖板201底部平面之间形成一定间隙,该间隙大于额定压力时压力传感硅片在垂直方向的变形量,当压力过载时该间隙消除,限制了敏感硅片204应变区210继续变形,达到防止损坏的目的,可以抵抗十倍以上的压力过载。
以上描述是对本发明的解释,不是对发明的限定,本发明所限定的范围参见权利要求,在不违背本发明构思的情况下,本发明可以作任何形式的修改。

Claims (2)

1.一种硅压力传感器的封装结构,其特征在于:包括盖板(201)和底座(202),所述盖板(201)以及底座(202)上分别开有通道,盖板(201)和底座(202)相互连接并形成中部空腔,在所述中部空腔内设置有密封垫(203)和压力传感硅片(204),密封垫(203)衬在压力传感硅片(204)下方,所述密封垫(203)上开有通孔,压力传感硅片(204)在所述中部空腔内处于浮动状态,压力传感硅片(204)的焊盘借助贯穿盖板(201)的小孔内填充的导电胶(205)和/或小孔的孔壁及上下边缘设置的导电层(206)与外电路连接。
2.根据权利要求1所述硅压力传感器的封装结构,其特征在于:所述盖板(201)顶层制作有电路,所述电路与信号调理芯片(208)电气连接。
CN201010156192.7A 2010-04-21 2010-04-21 硅压力传感器的封装结构 Active CN101799344B (zh)

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Application Number Priority Date Filing Date Title
CN201010156192.7A CN101799344B (zh) 2010-04-21 2010-04-21 硅压力传感器的封装结构
PCT/CN2011/070528 WO2011131045A1 (zh) 2010-04-21 2011-01-24 硅压力传感器的封装结构
KR1020127029137A KR101482720B1 (ko) 2010-04-21 2011-01-24 실리콘 압력센서의 패키지구조
EP11771498.0A EP2562524A4 (en) 2010-04-21 2011-01-24 Package structure for a silicon pressure sensor
US13/641,870 US8704318B2 (en) 2010-04-21 2011-01-24 Encapsulation structure for silicon pressure sensor
JP2013505309A JP2013525766A (ja) 2010-04-21 2011-01-24 シリコン圧力センサーのパッケージ構造

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US20130069181A1 (en) 2013-03-21
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