CN115052377A - 传感器罩的发热构造 - Google Patents
传感器罩的发热构造 Download PDFInfo
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Abstract
提供能够抑制将加热线设置于传感器罩的方法受到限制的情况的传感器罩的发热构造。传感器罩的发热构造应用于发送接收用于检测车外的物体的电磁波的车载传感器的传感器罩。上述发热构造具有设置于传感器罩的加热线(8),该传感器罩位于车载传感器的电磁波的发送方向的前方。在上述发热构造中,通过针对加热线(8)的通电而使得该加热线(8)发热。上述加热线(8)具有两个电极部(11)以及多个并列部(12)。上述两个电极部(11)具有规定的长度,且相互隔开距离而配置。上述多个并列部(12)以将两个电极部(11)连结的方式互相平行地延伸。上述电极部(11)的线宽设为大于或等于多个并列部(12)的线宽的合计值。
Description
技术领域
本发明涉及传感器罩的发热构造。
背景技术
在汽车等车辆搭载有发送接收用于检测车外的物体的电磁波的车载传感器。在车载传感器的电磁波的发送方向的前方配置有传感器罩。传感器罩用于使得从车外不易看到车载传感器。传感器罩能够使得电磁波透过。但是,随着冰雪向传感器罩的附着,传感器罩的电磁波的透过性会下降。因此,对于传感器罩,想到如专利文献1所示设置加热线(heaterwire)。在该情况下,如果对加热线通电而使得该加热线发热,则附着于传感器罩的冰雪融化。由此,能够抑制因冰雪的附着而使得传感器罩的电磁波的透过性下降的情况。
专利文献1:日本特开2019-145498号公报
发明内容
但是,在专利文献1中,以遍及传感器罩的要加热的整个部位的方式将一个加热线配置为较长地延伸。
这里,通电时的加热线的发热量由该加热线的电阻值R决定。加热线的电阻值R是基于加热线的电阻率ρ、长度L以及截面积S,如下式“R=ρ·L/S”那样规定的。根据该式可知,加热线的长度L越长,电阻值R越大,因此为了将长度L较长的加热线的发热量抑制为期望的值,必须增大加热线的截面积S。
在加热线为薄膜状的情况下,加热线的截面积S为线宽w与厚度t之积。因此,上式变为“R=ρ·L/(w·t)”。在该情况下,可知,为了将长度L较长的加热线的发热量抑制为期望的值,必须增大加热线的线宽w以及厚度t中的至少一者。然而,如果过度增大加热线的线宽w,则因加热线而导致传感器罩的电磁波的透过性下降。
在加热线为薄膜状的情况下,关于线宽w,无法设为大于或等于能够确保传感器罩的电磁波的透过性的最大值。因此,为了抑制因长度L增大而导致的加热线的发热量增大,必须增大加热线的厚度t。因此,作为将加热线设置于传感器罩的方法,例如难以采用溅射之类的无法充分减小加热线的厚度t的方法。
下面,对用于解决上述问题的方法及其作用效果进行记载。
解决上述问题的传感器罩的发热构造应用于发送接收用于检测车外的物体的电磁波的车载传感器的传感器罩。上述发热构造具有设置于所述传感器罩的加热线,所述传感器罩位于车载传感器的电磁波的发送方向的前方。关于上述发热构造,通过针对加热线的通电而使得该加热线发热。上述加热线具有两个电极部以及多个并列部。上述两个电极部具有规定的长度,且相互隔开距离而配置。上述多个并列部以将两个电极部连结的方式相互平行地延伸。上述电极部的线宽设为大于或等于多个并列部的线宽的合计值。
根据上述结构,即使增大多个并列部的各并列部的电阻值,也能够将多个并列部的合成电阻值抑制得较小。因此,在将加热线设为薄膜状的情况下,在将加热线的并列部的线宽规定为小于能够确保传感器罩的电磁波的透过性的最大值时,即使减小并列部的厚度,也能够将多个并列部的合成电阻值抑制得较小。由此,无需为了将加热线的电阻值、即加热线的发热量抑制为期望的值而增大并列部的厚度。其结果,作为将加热线设置于传感器罩的方法,例如可以采用溅射之类的无法充分减小加热线的厚度t的方法,能够抑制将加热线设置于传感器罩的方法受到限制的情况。
另外,将电极部的线宽设为大于或等于多个并列部的线宽的合计值,由此能够将多个并列部所连结的电极部的电流密度抑制得较小。其结果,能够抑制电极部的发热量增多,能够抑制随着电极部的发热的增多而在包含电极部以及多个并列部的加热线处产生发热的不均匀的情况。
可以考虑将上述电极部配置于不与从车载传感器发送的电磁波干涉的位置。
上述电极部的线宽大于并列部的线宽。因此,电极部容易屏蔽从车载传感器发送的电磁波。然而,根据上述结构,电极部配置于不与从车载传感器发送的电磁波干涉的位置,因此能够抑制该电磁波由电极部屏蔽而导致电磁波对车外的物体的检测精度下降的情况。
可以考虑如下方案,即,上述车载传感器在规定的角度区域发送电磁波,上述多个并列部以相对于上述角度区域平行的方式延伸。
根据该结构,在规定的角度区域内从车载传感器发送电磁波时,该电磁波与多个并列部不易干涉。因此,能够抑制电磁波对车外的物体的检测精度因多个并列部而下降的情况。
附图说明
图1(a)是表示车载传感器、壳体以及传感器罩的示意图,(b)是表示(a)的传感器罩的由双点划线包围的部分的放大剖面图。
图2是表示加热线的简图。
图3是表示电极部以及并列部相对于从车载传感器发送的电磁波的位置关系的简图。
图4是表示传感器罩的其他例子的示意图。
具体实施方式
下面,参照图1~图3对传感器罩的发热构造的一个实施方式进行说明。
图1(a)表示车载传感器1、壳体2以及传感器罩4。车载传感器1发送接收用于检测车外的物体的电磁波,例如考虑采用红外线传感器。作为上述电磁波,红外线传感器将红外线朝向车外(图1的左侧)发送,另一方面,接收与车外的物体接触而反射的上述红外线,通过这种红外线的发送接收而对车外的物体进行检测。
车载传感器1收容于搭载于车辆的壳体2内。壳体2朝向车载传感器1的电磁波的发送方向的前方(图1的左侧)开口。在该壳体2的开口部安装有用于使得无法从车外直接看到车载传感器1的传感器罩4。
图1(b)放大表示传感器罩4的由图1(a)的双点划线包围的部分的剖面。图1(b)所示的传感器罩4的罩基材5具有基底层6以及透明薄膜7。基底层6由PET(聚对苯二甲酸)等透明树脂形成。透明薄膜7将基底层6的与车载传感器1相反侧的面(图1(b)的左侧的面)覆盖。罩基材5位于由车载传感器1(图1(a))发送接收的电磁波的路径上。传感器罩4的罩基材5能够使由车载传感器1发送接收的电磁波透过。
传感器罩4具有加热线8、保护层9以及AR涂层10。加热线8由铜等金属制成且通过通电而发热。加热线8配置于罩基材5(透明薄膜7)的与车载传感器1相反侧的表面。保护层9将加热线8以及透明薄膜7覆盖,由PET等透明树脂形成。AR涂层10在保护层9的与车载传感器1相反侧的面通过防反射涂敷而形成。传感器罩4的保护层9以及AR涂层10也能够使由车载传感器1发送接收的电磁波透过。
接下来,对加热线8进行详细说明。
附着于传感器罩4的冰雪通过加热线8的通电的发热而融化。由此,能够抑制因冰雪的附着而妨碍电磁波相对于传感器罩4的透过。
如图2所示,加热线8具有两个电极部11以及多个并列部12。电极部11以及并列部12均呈薄膜状。两个电极部11具有规定的长度,并且彼此隔开距离地配置。多个并列部12以将两个电极部11连结的方式彼此平行地延伸。电极部11的线宽设为大于或等于多个并列部12的线宽的合计值。而且,通过对电极部11施加电压而进行针对加热线8的电极部11以及多个并列部12的通电,加热线8发热。
图3表示电极部11以及并列部12相对于从车载传感器1发送的电磁波的位置关系。车载传感器1在规定的角度区域A发送电磁波。上述角度区域A大致水平地扩展。加热线8的电极部11配置于不与从车载传感器1发送的电磁波干涉的位置、换言之为不与上述角度区域A重叠的位置。加热线8的多个并列部12以相对于上述角度区域A平行的方式延伸。在该例子中,多个并列部12大致沿水平方向延伸。
加热线8的多个并列部12的线宽w设为小于能够确保传感器罩4的电磁波的透过性的最大值的值。作为这种线宽w的最大值,例如能举出100μm。另外,包含电极部11以及多个并列部12的加热线8通过能够以呈薄膜状的方式设置于传感器罩4的方法、例如溅射而设置于传感器罩4。此外,可以通过能够以呈薄膜状的方式设置于传感器罩4的方法中的除了溅射以外的方法、例如蒸镀之类的干式镀覆、或者电镀以及无电解镀之类的湿式镀覆而将加热线8设置于传感器罩4。
接下来,对本实施方式的传感器罩4的发热构造的作用进行说明。
加热线8的发热量由整个加热线8的电阻值R决定,该电阻值R由加热线8的长度L以及截面积S决定。在加热线8为薄膜状的情况下,截面积S为加热线8的线宽w与厚度t之积。关于加热线8的多个并列部12,必须将线宽w设为小于上述最大值,因此必须通过厚度t的调节而实现用于将并列部12的发热量抑制为期望的值的截面积S的增大。
然而,如果将厚度t例如增大设定为大于或等于3μm,则在作为将包含电极部11以及多个并列部12在内的加热线8设置于传感器罩4的方法而采用溅射等的情况下,有可能厚度t变得过大而导致加热线8剥落。关于这一点,在加热线8中,多个并列部12分别以将两个电极部11连结的方式与该电极部11连接。在该情况下,多个并列部12的各自的厚度t较小而限制并列部12的截面积S的增大,即使各并列部12的电阻值增大,也能够将多个并列部12的合计电阻值抑制得较小。
因此,无需为了将加热线8的发热量(与电阻值对应)抑制为期望的值而增大并列部12的厚度t。其结果,作为将加热线8设置于传感器罩4的方法,例如可以采用溅射之类的无法充分减小加热线8的厚度t的方法,能够抑制将加热线8设置于传感器罩4的方法受到限制的情况。
另外,在加热线8中,电极部11的线宽设为大于或等于多个并列部12的线宽的合计值。由此,能够将多个并列部12连结的电极部11的电流密度抑制得较小。其结果,能够抑制电极部11的发热量增多,能够抑制伴随着电极部11的发热的增多而在包含电极部11以及多个并列部12在内的加热线8处产生发热的不均匀的情况。
根据以上详细叙述的本实施方式,能够获得下面所示的效果。
(1)能够抑制将加热线8设置于传感器罩4的方法受到限制的情况。
(2)能够抑制加热线8处的发热的不均匀。
(3)电极部11的线宽大于并列部12的线宽。因此,电极部11容易屏蔽从车载传感器1发送的电磁波。然而,电极部11配置于不与从车载传感器1发送的电磁波干涉的位置,因此能够抑制该电磁波由电极部11屏蔽而导致电磁波对车外的物体的检测精度下降的情况。
(4)车载传感器1在规定的角度区域A发送电磁波。多个并列部12以相对于上述角度区域A平行的方式延伸。因此,在规定的角度区域A内从车载传感器1发送电磁波时,该电磁波与多个并列部12不易干涉。因此,能够抑制电磁波对车外的物体的检测精度因多个并列部12而下降的情况。
此外,例如还可以以下面的方式对上述实施方式进行变更。可以在技术上不矛盾的范围对上述实施方式以及下面的变更例进行组合而实施。
·举例示出了作为传感器罩4而安装于壳体2的情况,但也可以如图4所示与壳体2分体地设置。在该情况下,在壳体2安装用于将其开口部封闭的其他罩13。
·发送来自车载传感器1的电磁波的角度区域A并非必须水平地扩展。
·加热线8的两个电极部11可以配置于与从车载传感器1发送的电磁波干涉的位置、换言之为与上述角度区域A重叠的位置。在该情况下,可以通过两个电极部11的位置调整而限制上述角度区域A。
·还可以通过金属浆料的分配或印刷之类的方法将加热线8设置于传感器罩4。
·作为发送接收电磁波的车载传感器1而举例示出了红外线传感器,但车载传感器1也可以是作为电磁波而发送接收毫米波的毫米波雷达。
标号的说明
1…车载传感器
2…壳体
4…传感器罩
5…罩基材
6…基底层
7…透明薄膜
8…加热线
9…保护层
10…AR涂层
11…电极部
12…并列部
13…罩。
Claims (3)
1.一种传感器罩的发热构造,其应用于发送接收用于检测车外的物体的电磁波的车载传感器的传感器罩,所述发热构造具有设置于所述传感器罩的加热线,所述传感器罩位于所述车载传感器的电磁波的发送方向的前方,所述发热构造通过针对该加热线的通电而使得该加热线发热,其中,
所述加热线具有两个电极部以及多个并列部,
所述两个电极部具有规定的长度,并且相互隔开距离而配置,
所述多个并列部以将所述两个电极部连结的方式相互平行地延伸,
所述电极部的线宽设为大于或等于所述多个并列部的线宽的合计值。
2.根据权利要求1所述的传感器罩的发热构造,其中,
所述电极部配置于不与从所述车载传感器发送的电磁波干涉的位置。
3.根据权利要求1或2所述的传感器罩的发热构造,其中,
所述车载传感器在规定的角度区域发送电磁波,
所述多个并列部以与所述角度区域平行的方式延伸。
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