CN104115041B - 具有可调光谱透射比的自动焊接滤光器 - Google Patents

具有可调光谱透射比的自动焊接滤光器 Download PDF

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CN104115041B
CN104115041B CN201380004890.7A CN201380004890A CN104115041B CN 104115041 B CN104115041 B CN 104115041B CN 201380004890 A CN201380004890 A CN 201380004890A CN 104115041 B CN104115041 B CN 104115041B
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CN104115041A (zh
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克里斯蒂娜·M·芒努松
肯尼思·亚雷福斯
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3M Innovative Properties Co
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    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
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Abstract

本发明涉及一种自动焊接滤光器，所述自动焊接滤光器响应于入射焊接光从明透射状态变化到暗透射状态，并且包括其光谱透射比可改变以使焊接作业的视觉外观最佳化的颜色可调滤光器。所述颜色可调滤光器包括设置在具有大致平行的偏振方向的偏振滤光器之间的至少一个低扭转液晶单元。用户能够响应于改变低扭转液晶单元的双折射特性的用户选定的颜色信号而独立于明暗度调节处于所述暗透射状态的所述自动焊接滤光器的颜色。

Description

具有可调光谱透射比的自动焊接滤光器
技术领域
本发明涉及一种自动焊接滤光器。具体而言，本发明涉及一种自动焊接滤光器，所述自动焊接滤光器响应于入射焊接光从明透射状态变化到暗透射状态，并且包括其光谱透射比可改变以使焊接作业的视觉外观最佳化的颜色可调滤光器。
背景技术
自动焊接滤光器为众所周知的，并且通常由可切换滤光器组成，所述可切换滤光器位于个人防护器械(例如，帽子或眼镜)上或作为个人防护器械的一部分。可切换滤光器能够响应于焊接光激活自动地从明透射状态切换到暗透射状这通常通过使用位于个人防护器械上或作为个人防护器械的一部分的传感器而实现，所述传感器检测焊弧的起点并产生对应的控制电压，所述对应的控制电压在被施加到可切换滤光器时致使可切换滤光器从明透射状态变化到暗透射状态。还可通过沿焊接吹管与自动焊接滤光器之间的通信通道传输激活信号来控制可切换滤光器的激活，这受对应通信单元控制，参见WO2007/047264(Garbergs等人)。此技术确保焊接工具在可切换滤光器已达到其暗透射状态之前不被激活。
US4,240,709()阐述可通过将一个扭转向列型液晶单元夹在一对相互交叉的偏振器之间来形成可切换滤光器；然而，大多数商业产品现在利用通过将两个扭转向列型液晶单元夹在三个交叉的偏振器之间形成的可切换滤光器。液晶分子能够在电子模块的控制之下跨液晶单元施加电压时定向。可切换滤光器随后在检测落在光电探测器上的入射焊接光时通过电子模块自动变暗。现有技术的自动焊接滤光器还包括使焊接光的有害IR波长分量和UV波长分量衰减的干涉滤光器，并且有时可包括在电子模块出现故障的情况下提供“故障安全”中间透射状态的第三液晶单元(通常为宾主型液晶单元)。WO95/29428(等人)揭示这样一种现有技术的自动焊接滤光器。
WO95/29428中所述的发明还解决了处于暗透射状态的可切换滤光器由于滤光器效果严重依赖于焊接光的入射角度的事实而不均匀地变暗的问题。WO95/29428提出一种包括低扭转向列型液晶单元的可切换滤光器，其中扭转角不同于常规的90度，并且小于85度。此方法显著改进在可切换滤光器的暗透射状态下的同质性。
使用这样一种自动焊接滤光器可大大提高电极布置精度，从而达到更高质量的焊接。生产率也随着对研磨和返工需要的相应减少而提高。然而，对于现有的自动焊接滤光器，焊接光的发射光谱因所使用的焊接方法和材料而异，并且这有时可使在暗透射状态下观察焊接作业变得更困难，而且这另外可导致效率和焊接质量的下降。
发明内容
本发明旨在通过提供自动焊接滤光器来解决这些问题，所述自动焊接滤光器包括：可切换滤光器，其响应于激活信号从明透射状态变化到暗透射状态；颜色可调滤光器，其与所述可切换滤光器光学对准，所述颜色可调滤光器的光谱透射比适于响应于用户选定的颜色信号而改变；和电子控制单元，其用于接收并控制所述信号。
使用其光谱透射比可响应于用户选定的颜色信号而改变的颜色可调滤光器的优点在于用户能够独立于明暗度调节处于所述暗透射状态的所述自动焊接滤光器的颜色，以提高可见度并使各种各样的焊接作业的视觉外观最佳化。优选地，所述颜色可调滤光器包括设置在具有大致平行的偏振方向的偏振滤光器之间的至少一个低扭转液晶单元。
此外，所述用户选定的颜色信号改变所述低扭转液晶单元的双折射特性。
所述低扭转液晶单元的扭转角可介于0度和60度之间。
优选地，所述低扭转液晶单元的扭转角介于30度和50度之间。
此外，具有大致平行的偏振方向的偏振滤光器以介于0度和15度间的角度对准。
所述可切换滤光器可包括第一扭转向列型液晶单元、第二扭转向列型液晶单元以及带通滤光器；并且所述第一扭转向列型液晶单元设置在第一偏振滤光器和第二偏振滤光器之间，并且所述扭转向列型第二液晶单元设置在第二偏振滤光器和第三偏振滤光器之间，所述偏振滤光器具有大致垂直的偏振方向。
优选地，所述第一扭转向列型液晶单元的扭转角和所述第二扭转向列型液晶单元的扭转角介于20度与85度之间。
此外，所述带通滤光器使IR波长分量和UV波长分量衰减。在所述电子控制单元出现故障的情况下，所述颜色可调滤光器可通过提供中间透射状态默认至故障安全操作模式。
优选地，所述明透射状态对应于焊接明暗度2至4中的任一个并且所述暗透射状态对应于焊接明暗度7至14中的任一个。
此外，所述中间透射状态对应于焊接明暗度5至8中的任一个。
所述用户选定的颜色信号可与所述可切换滤光器的透射状态无关。
优选地，所述用户选定的颜色信号适于以连续方式改变或通过选择多个预定义的用户设置来改变。
此外，所述颜色可调滤光器的光谱透射比可在380nm至780nm的可见光范围内变化。
本发明还提供一种焊接防护罩，所述焊接防护罩包括保护壳，所述保护壳中设置有如上文所述的自动焊接滤光器；和至少一个传感器，其被连接到所述电子控制单元以检测入射光，所述电子控制单元响应于指示入射光的存在的激活信号而对所述可切换滤光器施加电压。
优选地，所述自动焊接滤光器是能够替换的。
本发明还提供一种过滤高强度焊接光的方法，所述方法包括以下步骤：将光引导穿过带通滤光器，所述带通滤光器使IR波长分量和UV波长分量衰减；将光引导穿过可切换滤光器，所述可切换滤光器响应于激活信号自动地从明透射状态变化到暗透射状态；以及将光引导穿过颜色可调滤光器，所述颜色可调滤光器的光谱透射比能够响应于用户选定的颜色信号而改变。
此外，所述可切换滤光器和颜色可调滤光器为液晶单元。
优选地，本发明还包括以下步骤：使用连接到电子控制单元的至少一个传感器来检测高强度焊接光的存在；以及响应于所感测到的激活信号而对所述可切换滤光器施加电压。
附图说明
现在将结合附图仅以示例的方式描述本发明，图中：
图1是根据本发明的自动焊接滤光器10的分解图；
图2是安装在防护罩40上的本发明的自动焊接滤光器10的一个实施例的透视图；
图3是示意性地示出根据本发明的自动焊接滤光器10的操作的框图；
图4是根据本发明的颜色可调滤光器的分解图；并且
图5显示随着用户选定的颜色信号改变而从本发明的自动焊接滤光器10获得的光谱透射比响应。
具体实施方式
本发明已采用有利于用户能够独立于明暗度调节处于暗透射状态的自动焊接滤光器的颜色，以提高不同焊接作业的可见度的方法。从焊弧获得的发射光谱因所采用的焊接方法、所使用的材料、和保护气体和电流而异。同样地，从焊接烟尘散射的光也会影响作业的视觉外观。这另外可使在暗透射状态下观察焊接作业变得更加困难，而这又可导致效率和焊接质量的下降。有利地，提供另外在电子模块出现故障的情况下回到故障安全状态的颜色可调滤光器意味着不再需要另外的宾主液晶单元。
图1显示根据本发明的自动焊接滤光器10的分解图。焊接滤光器10最外面的组件是用来使来自高强度焊接光的IR波长分量和UV波长分量衰减的带通滤光器12。该带通滤光器可使用反射IR辐射并吸收焊接光的UVA、UVB和UVC分量的干涉滤光器来实现。作为另外一种选择，本领域的技术人员将会了解，带通滤光器12可使用单独的IR反射和/或吸收滤光器和UV反射和/或吸收滤光器的组合来实现。带通滤光器12的作用是去除来自高强度焊接光的有害IR波长分量和UV波长分量。
自动焊接滤光器10还包括第一偏振滤光器14、第一光学旋转液晶单元16、第二偏振滤光器18、第二光学旋转液晶单元20和第三偏振滤光器22。偏振滤光器14,18和22具有大致垂直的偏振方向。换句话讲，第二偏振滤光器18的偏振方向与第一偏振滤光器14的偏振方向大致垂直，并且第三偏振滤光器22具有与第一偏振滤光器14大致相同的偏振方向。
与这些组件光学对准的是其光谱透射比可由用户改变以控制焊接作业的视觉外观并使焊接作业的视觉外观最佳化的颜色可调滤光器。颜色可调滤光器包括设置在一对偏振滤光器之间的低扭转液晶单元24、第三偏振滤光器22和第四偏振滤光器26。偏振滤光器22和26具有大致平行的偏振方向。图1还显示液晶单元16,20和24中的每一个分别具有连接器30,32和34，可由所述连接器来施加控制电压。
颜色可调滤光器包括低扭转液晶单元24，所述低扭转液晶单元设置在具有大致平行的偏振方向的第三偏振滤光器22和第四偏振滤光器26之间。如本文件中所使用，术语“低扭转”意指具有小于90度的扭转角。例如，低扭转液晶单元24具有小于90度(通常为零或1至60度)的扭转角。更具体地讲，低扭转液晶单元24的扭转角为30至50度。低扭转颜色可调液晶单元24的设计在许多方面类似于下文所述的低扭转液晶单元16和20，但其操作完全不同，因为其相对于交叉偏振器被夹在平行偏振器22和26之间。颜色可调液晶单元24为暗的并且在不对连接器34施加电压的情况下表现出在用户看来主要为蓝色的某一颜色。当施加大于约4.0V的电压时，颜色可调液晶单元24变为光学透明的。所观察到的颜色随后可在更低电压(介于约0V和2.0V之间)下改变，如关于图5进一步阐述。本领域的技术人员将会了解，电压水平将根据所使用的液晶材料、不同的单元间隙几何形状等等针对不同的单元设计而不同。
当使用自动焊接滤光器10时，用户可选择一些预定义的用户颜色和明暗度设置或水平。这些设置或水平可以数字方式或经由例如通过刻度盘或可变电位计等输入。用户选定的颜色信号则是施加到液晶单元24的连接器34并改变低扭转液晶单元24的双折射特性的电压。光学效应是波长相依的，并且针对某些波长出现透射比峰值。透射比峰值(即，能够在指定波长下穿过液晶单元24的入射光的更大部分)可通过改变电压移位到不同波长，如下文所述。
液晶单元16和20也是“低扭转”单元。即，所述液晶单元具有小于90度(通常为零度或1至89度)的扭转角。此类低扭转单元的典型构造由定位在玻璃板之间的扭转向列型液晶材料组成。液晶单元的面朝内玻璃板具有透明导电电极层(例如，氧化铟锡层)，所述透明导电电极层上面施加有例如以机械方式(例如通过沿特定的对准方向涂刷或摩擦)处理的聚酰亚胺层。液晶界定表面中的所得结构迫使向列型分子采取特定角位置，以使分子扭转穿过它们介于界定表面之间的相应扭转角。在使用中，低扭转液晶单元24设置在具有大致平行的偏振方向的偏振滤光器之间，所述偏振滤光器以介于0度和15度之间的角度对准。在电非激活状态下(在不对连接器30和32施加电压的情况下)，随着光穿过单元，偏振平面被旋转并且滤光器变得透明。可通过在界定表面之间施加电场来控制向列型液晶分子的取向。在使用中，第一扭转向列型液晶单元16的扭转角和第二扭转向列型液晶单元20的扭转角介于20度和85度之间。
对连接器30和32施加电压在界定表面之间形成电场。向列型液晶分子与垂直于界定表面而不是平行于界定表面的电场对准，并且单元达到变暗状态。因此，当对低扭转单元16和20施加控制电压时，获得滤光器效果。可通过改变控制电压来控制向列型分子的旋转角度，并且因此也可控制相应的滤光器效果。结果是液晶单元16和20在不存在施加电压的情况下处于明透射状态，而在存在施加电压的情况下处于暗透射状态。本领域的技术人员将会了解，电压水平将根据所使用的液晶材料、不同的单元间隙几何形状等等针对不同的单元设计而不同。在使用中，根据EN379:2003的定义，明透射状态对应于焊接明暗度2至4中的任一个，并且用户可选择的暗透射状态对应于焊接明暗度7至14中的任一个。
图2为安装在自动变暗滤光器设备44中的本发明自动焊接滤光器10的一个实施例的透视图，所述自动变暗滤光器设备可被包括于防护帽，例如防护罩40(如安全防护罩，也被称为头盔)中。防护罩40包括防护罩主体42。自动变暗滤光器设备44包括自动焊接滤光器10，所述自动焊接滤光器被放置在适当位置以拦截电磁辐射(例如，可见光、UV光、IR等等)。在优选实施例中，自动变暗滤光器设备44定位在防护罩主体42中，以使其在防护罩由用户佩带时直接位于佩带者的眼睛的前面。
在本发明的其他实施例中，可在任何其他合适的器械或物件中以及针对其他应用提供一个或多个自动变暗滤光器设备44。例如，自动变暗滤光器设备44可提供作为防护眼镜(例如，护目镜)而不是图2的全覆盖防护罩42的一部分。作为另外一种选择，自动变暗滤光器设备44可被提供于手持装置中，或者被提供于允许检视其中可能存在高强度光的房间、机柜、机舱等的窗口或小孔中。
自动变暗滤光器设备44可结合工业操作使用，例如焊接(如弧焊接、吹管焊接、乙炔焊接)、切割(如激光切割、乙炔切割)、硬钎焊、软钎焊等等。它还可以结合涉及高强度光的医疗过程(如激光手术、除毛、去除纹身、牙科用树脂的光固化等)使用。本领域的技术人员将会了解，也可存在许多其他用途。
图3是示意性地示出根据本发明并安装在防护罩40中的自动焊接滤光器10的操作的框图。自动变暗滤光器设备44包括电子控制单元50，所述电子控制单元用于接收并控制到达自动焊接滤光器10，并且更具体地讲，分别经由连接器30,32和34到达液晶单元16,20和24的各种信号，如图1所示。
电子控制单元50经由用户输入模块54接收两组用户选定的信号。首先，用户可控制焊接明暗度7至14中的任一个之间的滤光器10的暗透射状态。其次，用户可独立地选择一些预定义的用户颜色设置，所述预定义的用户颜色设置在380nm至780nm的可见光谱内改变自动焊接滤光器10的颜色。预定义的用户颜色设置可经由数字手段(即，对应于红色、绿色或蓝色等的特定输入件或按钮)输入。作为另外一种选择，用户选定的颜色设置可经由刻度盘或可变电位计等以连续或类似方式改变，以使焊接作业的视觉外观最佳化。
用户随后能够独立于明暗度调节处于暗透射状态的自动焊接滤光器10的颜色，以提高各种各样的焊接作业的可见度。
电子控制单元50还包括输入检测器52。检测器52能够检测到指示高强度焊接光的存在的至少一个输入。在各种实施例中，检测器52可实体定位在靠近自动变暗滤光器设备44的一些或全部其他组件(硬件等等)的位置，或者可实体定位在远离一些或全部其他组件的位置。在图3中，检测器52显示为实体定位在防护罩40上，但本领域的技术人员将会了解，检测器52可形成自动变暗滤光器设备44或焊接滤光器10的一部分，或实体远离。本领域的技术人员将会了解，检测器52可使用各种光电探测器装置和技术来构建。作为另外一种选择，本领域的技术人员将会了解，指示高强度焊接光的存在的输入可响应于由例如焊接工具或吹管产生的激活信号由电子控制单元50产生。此陈述于WO2007/047264(Garbergs等人)中，并且这样一种方法也可结合本发明使用。
在电子控制单元50出现故障的情况下，颜色可调滤光器24通过提供中间透射状态默认至故障安全操作模式。根据EN379:2003的定义，中间透射状态是对应于焊接明暗度5至8中的任一个的故障安全模式或断电模式。
虽然图1示出作为设置在大致平行的偏振器22和26之间的单个低扭转液晶单元24的颜色可调滤光器的优选实施例，但本发明的另一实施例示出于图4中。
图4显示颜色可调滤光器的分解图，所述颜色可调滤光器包括设置在偏振滤光器64,66和68之间的两个液晶单元60和62。第一扭转向列型液晶单元60设置在第一偏振滤光器64和第二偏振滤光器66之间，并且第二扭转向列型液晶单元62设置在第二偏振滤光器66和第三偏振滤光器68之间。这两个液晶单元60和62中的液晶分子的扭转角为40度。这两个液晶单元60和62大致相同，但他们相对于彼此旋转180度，以针对不同观察角度赋予较少颜色变化。
所使用的液晶为具有夹在具有4μm的单元间隙的两个光学透明基板之间的0.09的Δn(普通光线与特殊光线的折射率之间的差值)的向列型。液晶单元60和62的光学透明基板的面朝内表面具有透明导电电极层(例如，氧化铟锡层)，所述透明导电电极层上面施加有定向层，例如已以机械方式(例如通过沿特定对准方向涂刷或摩擦)处理的聚酰亚胺层。液晶界定表面中的所得结构迫使向列型分子采取特定角位置，以使分子扭转穿过它们介于界定表面之间的相应扭转角。
对连接器80和82施加电压在液晶界定表面之间形成电场。向列型液晶分子与垂直于界定表面而不是平行于界定表面的电场对准，并且单元表现出不同的光谱透射比响应。
在图4所示实施例中，液晶单元60和62的对准方向被布置成彼此大致平行，并且相对于彼此不对称地定向。例如，液晶单元60的对准方向61被布置成大致平行于液晶单元62的对准方向69，并且相对于液晶单元62的对准方向69不对称地(即，沿相反方向)定向。相似地，液晶单元60的对准方向63被布置成大致平行于液晶单元62的对准方向67，并且相对于液晶单元62的对准方向67不对称地定向。此不对称取向在图4中由指示对准方向61,63和67,69的相反指向箭头示出。
偏振器64,66和68具有不同的取向，相对于垂直轴70分别为0度、5度和10度。偏振器取向已被选择成在不对连接器80和82施加电压的情况下赋予合适的光谱透射比(颜色)，并且使由单元间隙变化所引起的焊接滤光器10的观察区上面的颜色变化最小化。
图5显示从图1中所示的自动焊接滤光器10获得的不同的光谱透射比响应。图5显示针对本发明自动焊接滤光器所获得的三个不同的光谱透射比曲线。不同的光谱透射比响应在同一焊接明暗度处表现出不同的颜色，根据EN379:2003的定义。
光谱响应A是在不对颜色可调滤光器施加电压(0V)时获得。透过自动焊接滤光器观察到的颜色看起来为蓝色。光谱响应B通过对颜色可调滤光器施加约1.6V的电压而获得。透过自动焊接滤光器观察到的颜色看起来为绿色。光谱响应C通过对颜色可调滤光器施加约1.3V电压而获得。透过自动焊接滤光器观察到的颜色看起来为红色。这个顺序是因为存在两个透射比峰值。蓝色透射比峰值在施加电压时消失，并且来自红色侧的峰值随着电压增大而朝更短的波长移动。
如所提及，用户可选择一些预定义的用户颜色设置，所述设置在380nm至780nm的可见光谱内改变自动焊接滤光器10的颜色。预定义的用户颜色设置可以数字方式或经由例如刻度盘或可变电位计来输入。当不对颜色可调滤光器施加电压信号时，光谱透射曲线具有处于可见光谱的更短波长部分中的峰值，并且透过自动焊接滤光器10所观察到的主要为蓝色。随着电压增大，光谱透射曲线朝更短波长移位。蓝色透射比峰值朝离开可见范围的方向移动，并且另一透射比峰值从红外侧移动到可见范围内。在高电压状态下，颜色可调滤光器移位到在自动焊接滤光器10处于明透射状态时主要使用的透明颜色。

Claims (19)

1.一种自动焊接滤光器，包括：
可切换滤光器，其响应于激活信号从明透射状态变化到暗透射状态；
颜色可调滤光器，其与所述可切换滤光器光学对准，所述颜色可调滤光器的光谱透射比适于响应于用户选定的颜色信号而改变；和
电子控制单元，其用于接收并控制信号，其中
所述颜色可调滤光器包括设置在具有大致平行的偏振方向的偏振滤光器之间的至少一个低扭转液晶单元，所述低扭转液晶单元的扭转角小于90度。
2.根据权利要求1所述的自动焊接滤光器，其中所述用户选定的颜色信号改变所述低扭转液晶单元的双折射特性。
3.根据权利要求1所述的自动焊接滤光器，其中所述低扭转液晶单元的扭转角介于0度和60度之间。
4.根据权利要求1所述的自动焊接滤光器，其中所述低扭转液晶单元的扭转角介于30度和50度之间。
5.根据权利要求1所述的自动焊接滤光器，其中所述具有大致平行的偏振方向的偏振滤光器以介于0度和15度之间的角度对准。
6.根据权利要求1所述的自动焊接滤光器，其中所述可切换滤光器包括第一扭转向列型液晶单元、第二扭转向列型液晶单元以及带通滤光器；并且所述第一扭转向列型液晶单元设置在第一偏振滤光器和第二偏振滤光器之间，并且所述第二扭转向列型液晶单元设置在第二偏振滤光器和第三偏振滤光器之间，所述偏振滤光器具有大致垂直的偏振方向。
7.根据权利要求6所述的自动焊接滤光器，其中所述第一扭转向列型液晶单元的扭转角和所述第二扭转向列型液晶单元的扭转角介于20度和85度之间。
8.根据权利要求6所述的自动焊接滤光器，其中所述带通滤光器使IR波长分量和UV波长分量衰减。
9.根据权利要求1所述的自动焊接滤光器，其中在所述电子控制单元出现故障的情况下，所述颜色可调滤光器通过提供中间透射状态默认至故障安全操作模式。
10.根据权利要求1所述的自动焊接滤光器，其中所述明透射状态对应于焊接明暗度2至4中的任一个，并且所述暗透射状态对应于焊接明暗度7至14中的任一个。
11.根据权利要求9所述的自动焊接滤光器，其中所述中间透射状态对应于焊接明暗度5至8中的任一个。
12.根据权利要求1所述的自动焊接滤光器，其中所述用户选定的颜色信号与所述可切换滤光器的透射状态无关。
13.根据权利要求1所述的自动焊接滤光器，其中所述用户选定的颜色信号适于以连续方式改变或通过选择多个预定义的用户设置来改变。
14.根据权利要求1所述的自动焊接滤光器，其中所述颜色可调滤光器的光谱透射比能够在380nm至780nm的可见光范围内变化。
15.一种焊接防护罩，包括：
保护壳，所述保护壳中设置有根据权利要求1所述的自动焊接滤光器；和
至少一个传感器，其连接到所述电子控制单元以检测入射光，所述电子控制单元响应于指示入射光的存在的所述激活信号而对所述可切换滤光器施加电压。
16.根据权利要求15所述的焊接防护罩，其中所述自动焊接滤光器为能够替换的。
17.一种过滤高强度焊接光的方法，所述方法包括以下步骤：
将光引导穿过带通滤光器，所述带通滤光器使IR波长分量和UV波长分量衰减；
将光引导穿过可切换滤光器，所述可切换滤光器响应于激活信号自动地从明透射状态变化到暗透射状态；以及
将光引导穿过颜色可调滤光器，所述颜色可调滤光器的光谱透射比能够响应于用户选定的颜色信号而改变，所述颜色可调滤光器包括设置在具有大致平行的偏振方向的偏振滤光器之间的至少一个低扭转液晶单元，所述低扭转液晶单元的扭转角小于90度。
18.根据权利要求17所述的方法，其中所述可切换滤光器和颜色可调滤光器为液晶单元。
19.根据权利要求17所述的方法，所述方法还包括以下步骤：
使用连接到电子控制单元的至少一个传感器来检测高强度焊接光的存在；以及
响应于所感测到的激活信号而对所述可切换滤光器施加电压。
CN201380004890.7A 2012-01-25 2013-01-15 具有可调光谱透射比的自动焊接滤光器 Active CN104115041B (zh)

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