CN111637978A - 一种dfn封装的数字式红外温度传感器 - Google Patents
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Abstract
本发明公开一种DFN封装的数字式红外温度传感器,包括顶部带有开窗的DFN封装外壳,DFN封装外壳内设有热电堆、TC模板和ASIC模块,DFN封装外壳开窗处设有红外滤光片,所述红外滤光片与DFN封装外壳围成密闭空间;DFN封装外壳上设有引气孔和排气孔,DFN封装外壳底部设有引脚,DFN封装外壳内壁上设有金属屏蔽层和SiO2薄膜。具有微型化,低成本,电磁屏蔽效能好,测量精度高,易读性好,成型工艺简单,适合大规模的生产,应用广泛的优点。
Description
技术领域
本发明属于红外温度传感器技术领域,具体涉及一种DFN封装的数字式红外温度传感器。
背景技术
红外温度传感器的敏感单元吸收待测目标的红外辐射后,其红外光吸收区会产生温升,从而引起温度传感器某些物理量的变化,例如热电压或者热电阻等的变化。红外温度传感器的一个优势是可实现非接触测量,在不宜与待测目标接触的场合下,可以规避接触测温,例如在传染病的防疫工作中,非接触测温具有重要作用。此外,红外温度传感器还具有响应速度快、使用安全、寿命长等优点。
目前红外温度传感器的温度敏感元件较多选用热电堆,一般由若干个热电偶串联而成,待测目标的红外辐射使得热电堆热端温度升高,由于赛贝克效应,会在热电堆的热、冷端产生温差电动势。对温差电动势的冷端温度进行补偿,即可得出待测目标的实时温度。
目前市面上常见的红外温度传感器的封装方式是TO罐封装,将高精度红外热电堆封装于金属TO罐中,但是TO封装体积较大,不易于集成化。
DFN塑料封装方法目前较多用于传统IC集成电路的封装工艺中,具有体积小、可批量化生产等优点;然而,目前却较少将DFN塑料封装方法应用于热电堆红外温度传感器中。主要存在如下技术难点:(1)热电堆接收的红外辐射能量较少,对于热量的隔热要求高;(2)DFN塑料封装,电磁屏蔽效能较弱。此外,虽然有国内公司已经成功研发出微型封装的红外热电堆传感器,但是其输出信号依然是模拟电压信号,不利于该产品的推广应用。
发明内容
鉴于以上述现有技术的存在的问题,本发明提供一种用DFN封装的数字式红外温度传感器。
为实现上述发明的目的,本发明的具体技术方案如下:
一种DFN封装的数字式红外温度传感器,包括顶部带有开窗的DFN封装外壳,DFN封装外壳内设有热电堆、TC模板和ASIC模块,DFN封装外壳开窗处设有红外滤光片,所述红外滤光片与DFN封装外壳围成密闭空间;DFN封装外壳上设有引气孔和排气孔,DFN封装外壳底部设有引脚,DFN封装外壳内壁上设有金属屏蔽层和SiO2薄膜隔热层。
进一步地,所述金属屏蔽层采用在DFN封装的壳体内壁蒸镀有铜镀层和铜镀层,其中铜镀层的厚度为0.5~3.8 μm,镍镀层的厚度为0.2~0.5 μm。
进一步地,所述SiO2薄膜厚度为500 nm或1 μm。
进一步地,所述热电堆为微型热电堆,可实现红外光辐射能量到电压信号的转化。
进一步地,所述红外滤光片的波长通带为2~14 μm,其对应的测温范围约为-65~200ºC。
进一步地,所述TC模块采用金属热电阻或PTC热敏电阻或NTC热敏电阻。
进一步地,TC模块采用微型金属热电阻,其尺寸为0.2 mm~0.3 mm,其金属材料选用铂金。
进一步地,所述Pt热敏电阻丝的宽为2 μm,间距为8 μm,检测精度为±0.05℃。
进一步地,红外滤光片与DFN封装外壳围成密闭空间中充有惰性气体,惰性气体选用氩气。
进一步地,所述封装壳外部的底端安装有五个引脚,分别是SDA,VDD,GND,SCL,ADDR。
本发明的DFN封装的数字式红外温度传感器,具有以下有益效果:
(1)本发明的DFN封装的数字式红外温度传感器基于MEMS工艺,内置微型热电堆,并采用塑料DFN封装方式,实现红外温度传感器的微型化,在可靠性与金属或陶瓷材料相当的前提下,还具有微型化,低成本,成型工艺简单,适合大规模的生产,应用广泛的优点。
(2)本发明通过两个气孔在DFN壳体内部填入惰性气体,增加了壳体内的热阻,降低了热电堆热端的热量流失速率,提高检测精度。
(3)本发明在DFN内壁蒸镀了金属屏蔽层,提高了红外温度传感器的电磁屏蔽效能;本发明采用的Cu/Ni双镀层具有良好的电磁屏蔽功能,镍镀层具有较好的耐磨耐蚀性,可以保护内部的铜层不被氧化,长久耐用。
(4)本发明在DFN金属屏蔽层之外继续蒸镀一层SiO2薄膜,起到防止连接线短路的作用,同时由于SiO2具有较大的热阻,进一步减少热量流失速率,提高检测精度;
(5)本发明采用的镀膜工艺,可批量生产。相比于普通贴膜工艺,可实现生产自动化,且不会产生贴膜误差,比如贴膜过程中造成的贴膜不完整而导致电磁泄漏等问题;
(6)本发明将ASIC模块同时封装于壳体内,实现对热电堆及TC模块的信号处理与温度补偿,并提供电压输入端口与数字输出端口,提高该温度传感器的可读性与易集成性。
附图说明
图1是本发明的整体结构示意图(也作摘要附图);
图2是本发明的顶视图;
图3是本发明的壳体图;
图4是本发明的Pt热电阻;
图中:1、DFN封装外壳;2、红外滤光片;3、引气孔;4、排气孔;5、TC模块;6、装配焊点;7、热电堆;8、ASIC模块;201、窗口;202、SDA;203、VDD;204、GND;205、SCL;206、ADDR;301、DFN封装外壳;302、SiO2薄膜;303、Cu/Ni镀层。
具体实施方式
为了使本领域的技术人员更好地理解本发明的方法与系统,以下结合具体附图对本发明作进一步说明。
实施例一:
本发明的DFN封装的数字式红外温度传感器包括:DFN封装外壳1;红外滤光片2;引气孔3;排气孔4;TC模块5;装配焊点6;热电堆7;和ASIC模块8。
请参阅图1及图2,为最大可能减小所述DFN封装的数字式红外温度传感器的体积,选用微型热电堆作为温度敏感器件,将其封装于传感器内部,其功能是将红外辐射能量转换成电信号;红外滤光片2的波长通带为2~14 μm,实现了干扰光的滤除;所述TC模块5采用可采用金属热电阻或PTC热敏电阻或NTC热敏电阻,对热电堆的冷端温度进行补偿,得出待测目标的实时温度;ASIC模块可对NTC热敏电阻供电,且可对热电堆与TC模块的模拟信号进行处理并作温度补偿运算;热电堆7,TC模块5,ASIC模块8相隔一定间距排列,并通过装配焊点6安装在DFN封装外壳的底部;红外滤光片固定在箱体上部打开的窗口处并密封良好,红外滤光片与DFN封装外壳一起构成密闭空间。
如图1所示,封装壳两侧分别开有引气口3与排气口4,通过这两个气孔注入惰性气体,优选气体是氩气。
实施例二:
请参阅图2,本实例进一步设计在于,封装方式为塑料DFN封装,封装外部的底端安装有五个引脚,分别是SDA,VDD,GND,SCL,ADDR。所述SDA的功能是I2C数据线;VDD是电源端;GND是接地端;SCL是I2C时钟线;ADDR是I2C的LSB端口。
实施例三:
请参阅图3,本实例进一步设计在于,通过在封装壳内壁镀有屏蔽层和隔热层,提高了红外温度传感器的电磁屏蔽效能,防止连接线短路,减少热量流失速率,提高检测精度。DFN封装外壳301内壁上依次为屏蔽层为Cu/Ni镀层303和Cu/Ni镀层303 和SiO2薄膜302,其中铜镀层的厚度为0.5~3.8 μm,镍镀层的厚度为0.2~0.5 μm。隔热层采用SiO2薄膜302,SiO2薄膜厚度为500 nm或1 μm。
实施例四:
本实例进一步设计在于,屏蔽层与隔热层的加工顺序与方法,蒸镀步骤为:DFN封装壳内部先蒸镀一层Cu,然后再蒸镀Ni,最后蒸镀SiO2层。
请参阅图4,TC模块为微型TC模块,用于补偿热电堆的冷端温度。TC模块采用金属热电阻或PTC热敏电阻或NTC热敏电阻。TC模块的尺寸为0.2 mm~0.3 mm。TC模块Pt热电阻的加工工艺包括如下步骤:
a.在硅基表面生SiO2薄膜;
b.在SiO2薄膜上生长Pt层;
c.光刻工艺刻蚀中Pt丝图案;
d.制备SiO2保护层;
e.光刻工艺制备Pt热电阻电连接点。
所属Pt热敏电阻丝的宽为2 μm,间距为8 μm,包含15个线路循环。所述热电堆与TC模块的输出信号接入ASIC模块,对热电堆的冷端温度进行补偿,进而测出待测目标的实时温度。该传感器的原始信息经过处理后存储在RAM中,所述功能由状态机控制,每个测量转换的结果都可以通过I2C访问。
综上所述,本发明的DFN封装的数字式红外温度传感器,TC模块为微型温度补偿模块,DFN封装外壳采用塑料DFN封装,DFN封装壳体的内部蒸镀一层Cu/Ni金属薄膜与SiO2薄膜,分别作为屏蔽层与隔热层。本发明可实现红外温度传感器的微型化,可实现红外温度传感器的微型化;具有不逊于金属或陶瓷封装结构的可靠性,还具有微型化,低成本,成型工艺简单,适合大规模生产,应用广泛等优点。
本申请通过在壳体内部镀有屏蔽层使其具有良好的电磁屏蔽效能;通过在壳体内注入惰性气体及在壳体内壁镀有SiO2薄膜防止连接线短路,减少热量流失速率,提高传感器的检测精度;本发明采用的镀膜工艺可实现批量生产,相对于贴膜工艺,提高了生产效率与产品一致性;通过集成ASIC模块提高了该数字式红外温度传感器的可读性与易集成性。
Claims (10)
1.一种DFN封装的数字式红外温度传感器,其特征在于:包括顶部带有开窗的DFN封装外壳(1),DFN封装外壳(1)内设有热电堆(7)、TC模板(5)和ASIC模块(8),DFN封装外壳开窗处设有红外滤光片(2),所述红外滤光片(2)与DFN封装外壳(1)围成密闭空间;DFN封装外壳上设有引气孔(3)和排气孔(4),DFN封装外壳底部设有引脚,DFN封装外壳内壁上设有金属屏蔽层和SiO2薄膜隔热层。
2.根据权利要求1所述DFN封装的数字式红外温度传感器,其特征在于:所述金属屏蔽层采用在DFN封装的壳体内壁依次蒸镀有Cu金属层和Ni金属层,其中铜镀层的厚度为0.5~3.8 μm,镍镀层的厚度为0.2~0.5 μm。
3.根据权利要求1或2所述DFN封装的数字式红外温度传感器,其特征在于:SiO2薄膜厚度为500 nm或1 μm。
4.根据权利要求3所述DFN封装的数字式红外温度传感器,其特征在于:所述热电堆(7)为微型热电堆,可实现红外光辐射能量到电压信号的转化。
5.根据权利要求4所述DFN封装的数字式红外温度传感器,其特征在于:所述红外滤光片(2)的波长通带为2~14 μm,其对应的测温范围约为-65~200ºC。
6.根据权利要求5所述DFN封装的数字式红外温度传感器,其特征在于:所述TC模块(5)采用金属热电阻或PTC热敏电阻或NTC热敏电阻。
7.根据权利要求6所述DFN封装的数字式红外温度传感器,其特征在于:TC模块(5)采用微型金属热电阻,其尺寸为0.2 mm~0.3 mm,其金属材料选用铂金。
8.根据权利要求6所述DFN封装的数字式红外温度传感器,其特征在于:所述Pt热敏电阻丝的宽为2 μm,间距为8 μm,检测精度为±0.05℃。
9.根据权利要求8所述DFN封装的数字式红外温度传感器,其特征在于:红外滤光片(2)与DFN封装外壳(1)围成密闭空间中充有惰性气体,惰性气体选用氩气。
10.根据权利要求9所述DFN封装的数字式红外温度传感器,其特征在于:所述封装壳外部的底端安装有五个引脚,分别是SDA,VDD,GND,SCL,ADDR。
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