CN1255241C - 具有平表面的受控衰减型毛细管焊头 - Google Patents
具有平表面的受控衰减型毛细管焊头 Download PDFInfo
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- CN1255241C CN1255241C CNB028067428A CN02806742A CN1255241C CN 1255241 C CN1255241 C CN 1255241C CN B028067428 A CNB028067428 A CN B028067428A CN 02806742 A CN02806742 A CN 02806742A CN 1255241 C CN1255241 C CN 1255241C
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- soldering tip
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Abstract
本发明公开了一种用于将细引线焊接在基板上的受控衰减型焊头。所述焊头包括:第一圆柱形部分(1302),其具有大致均匀的第一直径;以及第二圆柱形部分(1304),其具有小于所述第一直径的大致均匀的第二直径。所述第二圆柱形部分连接着所述第一圆柱形部分的一端,并且具有沿着所述第二圆柱形部分的长度的至少一部分形成的平面区域(1303、1305)。
Description
技术领域
本发明总体上涉及一种用于将引线焊接在半导体装置上的焊头,特别地讲,涉及一种具有受控衰减特性的焊头。
背景技术
现代电子设备极其依赖于安装着半导体芯片或集成电路(IC)的印刷电路板。芯片与基板之间的机械和电连接对设计者是巨大的挑战。将IC与基板连接起来的三个众所周知的技术是:引线焊接、带式自动焊接(TAB)和倒装芯片。
这些方法中最常用的是引线焊接。在引线焊接中,多个焊垫在基板上表面上呈一种图形布置,芯片安装在焊垫图形的中心,并且芯片的上表面背离基板的上表面。细引线(可以是铝或金线)被连接在芯片上表面上的触点和基板上表面上的触点之间。特别地,连接引线通过毛细管焊头施加和焊接在基板上,下面对该焊头进一步描述。
毛细管焊头用于将焊球焊在电子装置上,特别地讲,是将引线(焊丝)焊接在半导体装置的焊垫上。这种毛细管焊头通常由一种陶瓷材料形成,这种陶瓷材料主要是氧化铝、碳化钨、红宝石、氧化锆增韧氧化铝(ZTA)、氧化铝增韧氧化锆(ATZ)和其他材料。通常是与直径为大约1mil的金、铜或铝丝类似的非常细的焊丝穿过毛细管焊头中的轴向通道,焊丝的末端上形成有小焊球,并且焊球被安置在毛细管焊头末端的外面。最开始目的是将焊球焊接在半导体装置的焊垫上,然后沿着焊丝将焊球一部分继续焊接在引线框架或类似物上。在焊接循环中,毛细管焊头执行一种以上的功能。
在焊球形成之后,毛细管焊头必须首先将焊球部分地集中在用于目标焊垫的毛细管内。经过第一焊接步骤,焊球被焊接在半导体装置的焊垫上。当毛细管焊头将焊球向下与焊垫接触时,焊球被压扁和变平。由于焊垫通常由铝制成,所以会有一层薄的氧化物形成在焊垫的表面上。为了形成正确的焊接,优选破坏掉氧化物表面,以将铝表面暴露出来。破坏氧化物的有效方法是使用焊球“擦洗”氧化物表面。焊球被放置在氧化铝表面上,然后毛细管焊头沿着由放置在超声波扬声器内的压电元件的膨胀和收缩确定的直线方向快速移动,毛细管焊头连接在超声波扬声器上。在通过焊垫施加热量的同时,再加上快速运动,能在焊丝和焊垫之间形成有效焊接。
然后,毛细管焊头在焊丝的拱丝过程中对其进行控制,以将焊接焊丝平稳地输出毛细管然后再拉回至毛细管中。这样,毛细管焊头将形成“针脚式”焊接和“点固”或“端固”焊接。
目前,热压超声波引线焊接是将半导体装置与它们的支承基板连接的可选择的方法。热压超声波焊接方法部分地依赖于超声波能量从换能器向焊球或焊丝的传输,其中换能器通过例如毛细管或楔块型焊头而被连接在可移动焊头上,焊球或焊丝则被焊接在半导体装置或支承基板上。
在传统的毛细管焊针(焊头)中,焊头的几何形状不能够更改能量向焊球/焊丝连接区分界区域的传输。本发明的发明人已经发现,焊头的超声波衰减控制对于控制焊接过程和其性能至关重要。
然而,传统焊头设计存在缺陷,这是因为传统焊头设计基于连接间距和焊丝拱丝高度,而没有考虑控制超声波衰减。
图1示出了传统焊头。如图1所示,焊头100具有圆柱形本体部分102和锥形部分104。轴向通道108从焊头100的端部110延伸至其末端106。焊丝(未示出)穿过轴向通道108和末端106,以最终在基板(未示出)上进行焊接。
发明内容
为了解决传统焊头的上述不足,本发明涉及一种焊头,其能够对焊头衰减的方向和增益进行控制。
该焊头包括:第一圆柱形部分,其具有大致均匀的第一直径;第二圆柱形部分,其具有与第一圆柱形部分的一端连接的第一端,并且具有小于第一直径的大致均匀的第二直径;以及第三部分,其具有预定锥形,且其第一端与第二圆柱形部分的一端连接。
根据本发明的另一方面,焊头包括:第一圆柱形部分,其具有大致均匀的第一直径;第二圆柱形部分,其具有与第一圆柱形部分的第一端连接的第一端,所述第二圆柱形部分具有:i)与第一圆柱形部分的第一直径大致相等的直径,以及沿着至少一部分第二圆柱形部分的长度的平面区域;以及第三部分,其具有预定锥形,且其第一端与第二圆柱形部分的一端连接。
根据本发明的另一方面,焊头包括:第一部分,其具有大致均匀的第一直径,并且具有平面部分,该平面部分沿着至少一部分第一部分的长度形成;第二圆柱形部分,其具有与第一部分的一端连接的第一端,并且具有与第一直径基本相等的大致均匀的第二直径;以及第三部分,其具有预定锥形,且其第一端与第二圆柱形部分的第二端连接。
根据本发明的又一方面,焊头包括:第一圆柱形部分,其具有大致均匀的第一直径;以及第二圆柱形部分,其具有与第一圆柱形部分的一端连接的第一端,所述第二圆柱形部分具有:i)小于第一直径的大致均匀的第二直径,以及沿着至少一部分第二圆柱形部分的长度的平面区域。
根据本发明的一个方面,焊头由单块材料形成。
根据本发明的另一方面,过渡区域连接在第一部分和第二部分之间。
根据本发明的另一方面,锥形部分在其一端上具有另一个锥形部分。
根据本发明的又一方面,定位导向部分安置在焊头的第一部分的第二端。
下面,通过参照附图对本发明的示例性实施例进行描述,以说明本发明的这些及其他方面。
附图说明
下面,通过参照附图对本发明进行详细描述,可更好地理解本发明。应当强调,根据常识,附图的各种特征并不是按比例表示的。相反,为了清楚表示,各种特征的尺寸可以任意地扩大或缩小。附图包括:
图1是一种传统焊头的侧视图;
图2示出了焊头相对于换能器运动的响应;
图3A-3H是根据本发明的第一示例性实施例的焊头的各种视图;
图4A-4E是根据本发明的第二示例性实施例的焊头的各种视图;
图5是曲线图,描绘的是超声波能量对根据本发明示例性实施例的焊头的作用;
图6是曲线图,描绘的是根据本发明示例性实施例的焊头的超声波能量与谐振频率之间的关系;
图7是曲线图,描绘的是根据本发明示例性实施例的焊头的毛细管位移;
图8示出了示例性焊头与超声波换能器的相互关系;
图9A-9F示出了用于将示例性焊头定向在超声波换能器内的示例性方法;
图10A-10D和图11A-11E示出了超声波换能器与图9A-9F中的焊头的详细配合情况;
图12A-12C是根据本发明的第三示例性实施例的焊头的各种视图;以及
图13A-13D是根据本发明的第四示例性实施例的焊头的各种视图。
具体实施方式
本发明通过沿着焊头长度方向改变质量分布克服了传统毛细管焊头的不足。与传统焊头相比,这种焊头在基板上形成焊点需要较小的超声波能量。超声波衰减方向能通过下面将进一步介绍的适当设计而被控制和更改。
超声波焊头的设计可用描述超声波换能器驱动的焊头的运动的数学公式描述。这样一种系统可用方程(1)表示的悬臂梁表示:
其中,E是弹性模量,I是转动惯量,m是质量分布,z是至移动支承的距离,X是垂直于悬臂梁的位移,X0表示的是移动支承的运动。
方程(1)的边界条件是:
(1)x(O,t)=x0·eiw·t
(3)m(l,t)=0
其中:
l是悬臂长度;
V是剪力。
图2示出了根据方程(1)的焊头响应。如图2所示,为了说明焊头的设计,悬臂梁200表示焊头,204表示换能器202的运动x0,以及206表示焊头的响应运动x(z,t)。由于质量和转动惯量可以沿着悬臂梁变化,因此这些参数可以用于设计焊头的成分和“形状”,以便产生所希望的焊接超声波运动。
如上所述,在传统设计中,转动惯量I和质量分布m并没有为衰减超声波的目的而被控制,而仅仅是为获得所要求的连接间距和焊丝拱丝高度而控制。在本发明的示例性实施例中,横截面形状和质量分别得到具体限定,以控制超声波衰减方向和/或增益。
下面给出了区域转动惯量I和质量分布m的设计结果的几个实例。表1是与验证该思想相关的实验工作的汇总。
毛细管 | 直径314(10-3英寸) | 宽度(10-3英寸) | 高度(10-3英寸) |
A1 | 16.0(0.406mm) | 17.2(0.437mm) | 165.6(4.206mm) |
A2 | 14.7(0.373mm) | 17.0(0.431mm) | 174.3(4.427mm) |
A3 | 13.7(0.348mm) | 17.8(0.452mm) | 183.3(4.656mm) |
H1 | 16.0(0.406mm) | 17.2(0.437mm) | 184.4(4.683mm) |
H2 | 16.5(0.419mm) | 17.4(0.442mm) | 151.4(3.845mm) |
H3 | 16.6(0.422mm) | 16.4(0.417mm) | 140.7(3.573mm) |
W1 | 15.9(0.404mm) | 13.6(0.345mm) | 161.8(4.110mm) |
W2 | 15.9(0.404mm) | 19.3(0.490mm) | 164.6(4.181mm) |
D1 | 11.4(0.289mm) | 17.4(0.442mm) | 165.4(4.201mm) |
D2 | 8.2(0.208mm) | 16.9(0.429mm) | 165.7(4.209mm) |
H1D2 | 11.5(0.292mm) | 17.1(0.434mm) | 181.9(4.620mm) |
H2D2 | 8.2(0.208mm) | 15.6(0.419mm) | 149.8(3.805mm) |
表1
图3A-3G是根据本发明第一示例性实施例的毛细管焊头的各种视图。图3A和3D分别是根据本发明第一示例性实施例的焊头300的侧视图和透视图。如图3A所示,焊头300具有上圆柱形本体部分302、下圆柱形本体部分304和圆锥形本体部分306。安置在上圆柱形本体部分302与下圆柱形本体部分304之间的是过渡区域312。在该示例性实施例中,过渡区域312呈斜面形状。然而,本发明过渡区域312并不受限于这种形状,其也可以是其他形状,例如图3E中所示的曲线形状312A。然而,为了能使能量平稳地传过过渡区域312,优选使过渡区域312不具有锋利边缘,例如,过渡区域312不能仅被构造为上圆柱形本体部分302与下圆柱形本体部分304之间的“台阶式缩减部分”。
在该示例性实施例中,焊头300的总长度301在大约0.300-0.600英寸(7.62-15.748mm)之间,优选为大约0.437英寸(11.0mm)。上圆柱形本体部分302的直径308在大约0.0625-0.0866英寸(1.5875-2.20mm)之间,优选大约0.0625英寸(1.59mm)。下圆柱形本体部分304的直径314在大约0.0342-0.0625英寸(0.86868-1.5875mm)之间,并且下圆柱形本体部分304以距离焊头300的端部332大约0.020-0.279英寸(5.08-7.0866mm)的位置328作为起始。在本发明优选实施例中,直径314为大约0.0342英寸(0.868mm)。过渡区域312的角度313为大约90°。
图3B是焊头300的侧向剖视图。如图3B所示,轴向通道320从焊头300的端部322延伸至端部332。在该示例性实施例中,轴向通道320具有大致连续的锥形形状,该锥形具有大约2°-5°、优选为大约2°-3°的预定角度326。然而,本发明并不受限于此,也可使通道320具有大致恒定的直径,或者仅在焊头300的一部分长度上呈锥形。后者有利于焊丝在焊头300的上端322插入。这些替代性轴向通道的实例如图3F和3G所示。如图3F所示,轴向通道320在焊头300相当大的长度上具有大致恒定的直径330。在图3G中,轴向通道320在焊头300相当大的长度上具有大致恒定的直径340,而在邻近于焊头300的端部322具有锥形部分342。
为了保持焊头300的结构整体性,在焊头300的设计过程中,必须考虑轴向通道320与外壁327之间的距离。本发明人将该距离称为“最小壁厚”(MWT)324。现参看图3H,焊头300的放大横截面详细地描述了MWT 324。在优选实施例中,焊头300的MWT 324在大约0.0004-0.01625英寸(0.01mm-0.40mm)之间。
参看图3C,图中示出了圆锥形本体部分306的详细剖视图。在图3C中,末端310从圆锥形本体部分306的下端延伸。在该示例性实施例中,末端310的外角318在大约5°-20°之间,优选大约10°,而圆锥形本体部分306的外角316在大约17°-31°之间。同样地,过渡部分334用于在圆锥形本体部分306与末端310之间形成过渡。如图3C所示,轴向通道320的角度在圆锥形本体部分306的整个长度和末端310的大部分长度上保持大致恒定。然而,在末端310的下部分上,轴向通道320相对于纵向轴线的角度降至为大约0°,因此在末端310的最终部分上轴向通道320具有直径大致均匀的通道336。
如上所述,用于形成毛细管焊头的材料包含:氧化铝、氧化锆、氮化硅、碳化硅、碳化钨、红宝石、ZTA和ATZ。可以设想,示例性焊头可以以单件的形式通过机加工和/或模塑上述材料形成。
参看图4A-4E,图中示出了本发明的第二示例性实施例。图4A和4E分别是根据本发明第二示例性实施例的焊头400的侧视图和透视图。如图4A所示,焊头400具有上圆柱形本体部分402、下本体部分404和圆锥形本体部分406。
第一和第二示例性实施例之间的显著区别是下本体部分404具有彼此平行的平面部分403、405,它们位于下本体部分404的相反两侧上。在该示例性实施例中,平面部分403与405之间的距离414在大约0.0345-0.0625英寸(0.8763-1.5875mm)之间。另一区别是下本体部分404具有与上本体部分402的直径408大致相等的直径。在优选实施例中,下本体部分404的直径与上本体部分402的直径相等。图4C是沿着图4A的横截面C-C的俯视图,图中示出了平面部分403、405和下本体部分404的直径408之间的关系。
图4B是焊头400的侧向剖视图。如图4B所示,轴向通道420从焊头400的端部422延伸至焊头400的端部432。在该示例性实施例中,轴向通道420具有大致连续的锥形形状,该锥形形状具有(如图4D中详细所示)大约2°-5°、优选为大约2°-3°的预定角度426。然而,本发明并不受限于此,可以设想,轴向通道420也可以具有大致恒定的直径,或者与第一示例性实施例相似而仅在焊头400的一部分长度上呈锥形。与第一示例性实施例相似,过渡区域412、413分别在平面部分403、405所在的区域上从上圆柱形本体部分402过渡到下本体部分404。尽管过渡区域412、413如图4B所示具有斜面形状(平表面),但也可以采用与图3D所示的相似的曲面。
本发明人已经发现,如果采用非对称的形状,根据第二示例性实施例的焊头沿着X轴的刚度就会与沿着y轴的刚度不同。这种差别可以通过改变平面部分403、405的长度和/或宽度控制。本领域普通技术人员可以理解,平面部分403、405的宽度直接与它们之间的距离414相关。也即,平面部分403、405的宽度越大,它们之间的距离414就越小。
在其他所有方面,第二示例性实施例与第一示例性实施例相似。
参看图5,图中示出了曲线图500。在图5中,曲线图500描述的是下本体部分304、404的质量减小对焊头300、400的位移206(如图2所示)的影响结果,其中位移206是由超声波沿着焊头300、400的长度即从换能器安装件(未示出)到自由焊接端(末端310、410)施加强迫作用而引起的。在图5中,纵坐标是以英寸表示的相对于换能器底部的位置,横坐标是以μm表示的焊头的位移。曲线图500是为多种焊头绘制的,这些焊头中下本体部分304、404的位置和几何形状各不相同。在图5中,因固定频率的超声波能量而引起的零位移焊头运动的位置以节点502表示。在本发明中,下本体部分304、404的质量被调整,以使焊头300、400的节点位于502。本发明人已经发现,调整下本体部分304、404的质量以使节点位于502,可使焊头的效率最大化。在图5中,曲线504表示的是一种传统(参考)焊头的响应,曲线506-518表示的是根据本发明示例性实施例的焊头的响应。
在图6中,曲线图600示出了固定焊头末端位移的超声波能量与谐振频率之间的关系。在图6中,示出了谐振点602-624,并且这些谐振点被绘制成曲线626。如图6所示,点624表示参考的传统焊头,与根据本发明的焊头(如点602-622所示)相比,其需要显著更高的能量。曲线图600表明,调整焊头300、400的下本体部分304、404的质量能够明显地降低所需能量。
在图7中,曲线图700示出了根据本发明的焊头和传统焊头的位移。如图7所示,几何形状最优化的焊头的位移比标准杆状焊头的位移大,其中几何形状最优化是通过控制转动惯量及按照示例性实施例中所示特征进行机加工而实现的。对图7进行分析可知,对于引线焊接,末端位移曲线在使用根据本发明的受控几何形状的毛细管焊头之前(曲线702)和之后(曲线704)均比标准焊头的曲线(706)高。
本发明人还发现,示例性焊头的受控衰减能够进行更高质量的焊接。表2是表示各种焊头、焊接(超声波)能量、结合力、破坏结合所需的剪力的数据的汇总。从表中清楚可知,示例性焊头使用的能量小于传统焊头所需能量的50%,但提供的焊接却表现出更优秀的抗剪切能力。
毛细管焊头 | 剪力/UA(gr/mil2) | 焊球直径(μm) | USG(mA) | 时间(ms) | 力(gr) |
参考(传统设计) | 6.37 | 43.7 | 80 | 6 | 11 |
160W3 | 7.10 | 41.8 | 30 | 6 | 12 |
160W3-1 | 6.79 | 40.0 | 30 | 6 | 12 |
160W3-2 | 7.41 | 41.1 | 30 | 6 | 12 |
160W3-3 | 7.71 | 41.7 | 30 | 6 | 12 |
160W3-4 | 6.51 | 41.2 | 30 | 6 | 12 |
160W3-5 | 6.88 | 40.5 | 30 | 6 | 12 |
表2
表3是用于表示与传统焊头相比根据本发明的焊头所形成的结合具有更优秀的抗拉能力的数据的汇总。
毛细管焊头 | 拉力X(gr) | 拉力Y(gr) | 平均拉力(gr) | USG(mA) | 时间(ms) | 力(gr) |
参考(传统设计) | 7.15 | 7.08 | 7.11 | 65 | 5 | 120 |
160W3 | 7.24 | 7.04 | 7.14 | 35 | 6 | 100 |
160W3-1 | 7.00 | 7.12 | 7.06 | 35 | 6 | 100 |
160W3-2 | 7.33 | 7.23 | 7.28 | 35 | 6 | 100 |
160W3-3 | 7.81 | 7.36 | 7.58 | 35 | 6 | 100 |
160W3-4 | 7.15 | 7.25 | 7.20 | 35 | 6 | 100 |
160W3-5 | 7.28 | 7.16 | 7.22 | 35 | 6 | 100 |
表3
图8示出了示例性焊头300、400与超声波换能器800的相互连接关系。如图8所示,焊头300、400插入超声波换能器800的孔804中。
上面根据第二示例性实施例描述的焊头400由于将平面部分403、405设置在下本体部分404中而具有方向性。这样,就可以理想地将焊头400定向在超声波换能器800中,以便高效地沿着交坐标轴中的一个轴线传导更多的超声波能量。确保正确定向的一个方法是将焊头400上的一个定位器与超声波换能器上的相似定位器紧密配合。示例性方法将通过参看图9A-9F给以描述。
参看图9A-9F,图中示出了用于将焊头400定向在超声波换能器800(如图8所示)中的示例性方法。在图9A中,示出了沿着焊头400上部安置的定位平面900。斜平面被成形为相对于焊头400的纵向轴线呈角度γ。
在图9C中,示出了沿着焊头400的上部放置的定位键槽904。在该示例性实施例中,键槽904具有与纵向轴线正交的均匀深度。然而,本发明并不受限于此,如图9D-9F所示,键槽可以具有斜面形状例如键槽906、曲线或椭圆形状908或锯齿形状910。根据前面所述的定向方法,基于具体焊接需要,定位器(900、902、904、906等)可以沿着与平面部分403、405相同的平面放置,或者与它们垂直放置。采用这种方式,在所希望的方向上可以使能量效率最大化。
参看图10A-10D,图中详细地示出了超声波换能器800与焊头(如图9A和9B所示)紧密配合的情况。图10A和10B分别是超声波换能器800的端部的俯视图和侧向剖视图。在图10A和10B中,孔1000形成在超声波换能器800中,并具有用于与定位平面900(如图9A所示)紧密配合的平坦部分1002,因此能够正确地将焊头400定向在超声波换能器800内,以沿着所希望的焊接方向提供较高的能量效率。类似地,图10C示出了用于与斜定位平面902(如图9B所示)配合的具有斜平面部分1006的孔1004。如图10C所示,孔1004的平面部分1006与斜平面902类似,也是形成角度γ上。图10D是超声波换能器800的端部的透视图,示出了孔1000、1004。
类似地,图11A-11E示出了超声波换能器800中的具有凸起部分1102、1104、1106的孔1100,这些凸起部分用于与合适的键槽904、906、908、910(如图9C-9F所示)紧密配合。尽管在这些图中没有示出,但可以理解,凸起部分1102可以形成在一个角度上,以与斜面键槽906(如图9D所示)配合。虽然没有具体说明,但也可以理解,键槽908、910也可以形成在一个相对于焊头纵向的角度上。同样,凸起部分1104、1106也可以分别形成在合适的角度上,以与这些斜面键槽紧密配合。
在图12A-12C中,示出了本发明第三示例性实施例。图12A是根据本发明第三示例性实施例的焊头1200的侧向剖视图。如图12A所示,焊头1200具有上本体部分1202、下圆柱形本体部分1204及圆锥形本体部分1206。沿着上本体部分1202的长度设有平面部分1203。在该实施例中,平面部分1203用于改变焊头的质量和转动惯量,并且提供了用于将焊头1200对正在超声波换能器中的装置。
在一个示例性实施例中,平面部分1203的长度为大约0.177英寸(4.50mm),下圆柱形本体部分1204的直径为大约0.0625英寸(1.59mm),平面部分1203与上本体部分1202上的与平面部分相反的外壁之间的距离至少为0.05英寸(1.27mm)。如上所述,在第一示例性实施例中,平面部分1203与轴向通道1220的内壁之间的MWT(例如,如图3H中所示)必须能够保持焊头的整体性。在其他所有方面,本实施例与第一和第二示例性实施例相似。
在图13A-13D中,示出了本发明第四示例性实施例。图13A是根据本发明第四示例性实施例的焊头1300的侧向剖视图。如图13A所示,焊头1300具有上圆柱形部分1302、下本体部分1304及圆锥形本体部分1306。沿着下本体部分1304的长度设有平面部分1303、1305。第四示例性实施例是第一和第二示例性实施例的组合。在该实施例中,下本体部分和平面部分1303、1305改变了焊头1300的质量和转动惯量,因此能够影响焊头1300的衰减。
图13B是示出了孔1320的焊头1300的侧向剖视图。图13C是示出了上圆柱形部分1302、下本体部分1304和平面部分1303和1305之间关系的焊头1300的俯视图,图13D是焊头1300的透视图。如上所述,在第一示例性实施例中,平面部分1303与轴向通道1320的内壁之间的MWT(例如,如图3H中所示)必须能够保持焊头的整体性。在其他所有方面,本实施例与第一和第二示例性实施例相似。
虽然前面参照示例性实施例描述了本发明,但本发明并不局限于此。相反,应当认为权利要求的范围包括在不脱离本发明真实精神和范围的前提下由本领域普通技术人员对本发明所作的其他变化和实施例。
Claims (26)
1.一种用于将细引线焊接在基板上的焊头,包括:
第一圆柱形部分,其具有大致均匀的第一直径;
第二圆柱形部分,其具有与所述第一圆柱形部分的一端连接的第一端,所述第二圆柱形部分具有:i)小于所述第一直径的大致均匀的第二直径,以及ii)沿着所述第二圆柱形部分的长度的至少一部分形成的平面区域;以及
轴向通道,其沿着所述焊头的纵向轴线从所述焊头的第一端延伸至所述焊头的第二端。
2.如权利要求1所述的焊头,其特征在于:所述平面区域是分别位于所述第二圆柱形部分的相反侧上的彼此大致平行的两个平面区域。
3.如权利要求1所述的焊头,还包括:第三部分,其具有第一预定锥形,且所述第三部分的第一端连接着所述第二圆柱形部分的第二端。
4.如权利要求3所述的焊头,其特征在于:所述第一预定锥形的角度在17°-31°之间。
5.如权利要求3所述的焊头,其特征在于:所述第三部分具有另一个锥形部分,所述另一个锥形部分具有第二预定锥形,且连接着所述第三部分的第二端。
6.如权利要求5所述的焊头,其特征在于:所述第一预定锥形的角度为20°,所述第二预定锥形的角度为10°。
7.如权利要求1所述的焊头,其特征在于:所述轴向通道在所述第一圆柱形部分的第一端具有第一直径,并在所述第一锥形部分的末端具有第二直径,所述第一直径大于所述第二直径。
8.如权利要求1所述的焊头,还包括:过渡部分,其连接在所述第一圆柱形部分与所述第二圆柱形部分之间。
9.如权利要求8所述的焊头,其特征在于:所述过渡部分是锥形部分和曲线部分二者之一。
10.如权利要求1所述的焊头,其特征在于:所述焊头由以下材料中的至少一种形成:氧化铝、氮化硅、金刚砂、碳化钨、红宝石、陶瓷和氧化锆。
11.如权利要求1所述的焊头,其特征在于:所述第二圆柱形部分的第一端与所述焊头的末端相隔。
12.如权利要求11所述的焊头,其特征在于:所述距离在5.08-7.0866mm之间。
13.如权利要求1所述的焊头,其特征在于:所述焊头由单块材料形成。
14.一种用于将细引线焊接在基板上的焊头,包括:
第一圆柱形部分,其具有大致均匀的第一直径;
第二圆柱形部分,其具有连接着所述第一圆柱形部分的第一端的第一端,所述第二圆柱形部分具有:i)与所述第一圆柱形部分的第一直径大致相等的直径,以及ii)沿着所述第二圆柱形部分的长度的至少一部分形成的平面区域;
第三部分,其具有第一预定锥形,且所述第三部分的第一端连接着所述第二圆柱形部分的一端;以及
轴向通道,其沿着所述焊头的纵向轴线从所述焊头的第一端延伸至所述焊头的第二端。
15.如权利要求14所述的焊头,其特征在于:所述平面区域是分别位于所述第二圆柱形部分的相反侧上的彼此大致平行的两个平面区域。
16.如权利要求15所述的焊头,其特征在于:所述平面区域之间的距离在0.8763-1.5875mm之间。
17.如权利要求14所述的焊头,其特征在于:所述平面区域延伸到所述第三部分的一个部位上。
18.如权利要求14所述的焊头,其特征在于:所述第一预定锥形的角度在17°-31°之间。
19.如权利要求14所述的焊头,其特征在于:所述锥形部分具有另一个锥形部分,所述另一个锥形部分具有第二预定锥形,且连接着所述第三部分的第二端。
20.如权利要求19所述的焊头,其特征在于:所述第一预定锥形的角度为20°,所述第二预定锥形的角度为10°。
21.如权利要求14所述的焊头,其特征在于:所述轴向通道在所述第一圆柱形部分的第一端具有第一直径,并在所述锥形部分的末端具有第二直径,所述第一直径大于所述第二直径。
22.如权利要求14所述的焊头,其特征在于:所述第二圆柱形部分的第一端与所述焊头的一端相隔。
23.如权利要求22所述的焊头,其特征在于:所述距离在5.08-7.0866mm之间。
24.如权利要求14所述的焊头,其特征在于:所述焊头由单块材料形成。
25.一种与换能器一同使用的焊头,包括:
第一圆柱形部分,其具有大致均匀的第一直径;
第二圆柱形部分,其具有连接着所述第一圆柱形部分一端的第一端,所述第二圆柱形部分具有:i)小于所述第一直径的大致均匀的第二直径,以及ii)沿着所述第二圆柱形部分的长度的至少一部分形成的平面区域;
导向部分,其设置在所述第一圆柱形部分的第一端,用于将所述焊头定位在所述换能器内;以及
轴向通道,其沿着所述焊头的纵向轴线从所述焊头的第一端延伸至所述焊头的第二端。
26.如权利要求25所述的焊头,其特征在于:所述导向部分是沿着所述第一圆柱形部分的上部形成的平面部分和孔二者之一。
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US09/886,560 US6497356B2 (en) | 2000-04-28 | 2001-06-21 | Controlled attenuation capillary with planar surface |
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EP (1) | EP1345727A1 (zh) |
JP (1) | JP2004531897A (zh) |
KR (1) | KR20040010604A (zh) |
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JP3742332B2 (ja) * | 2001-11-12 | 2006-02-01 | 株式会社新川 | ワイヤボンデイング装置 |
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US7261230B2 (en) * | 2003-08-29 | 2007-08-28 | Freescale Semiconductor, Inc. | Wirebonding insulated wire and capillary therefor |
US20050109746A1 (en) * | 2003-11-26 | 2005-05-26 | International Business Machines Corporation | Method for fluxless soldering of workpieces |
EP1535689A3 (en) * | 2003-11-26 | 2006-09-20 | International Business Machines Corporation | Method for fluxless soldering of workpieces |
US7320425B2 (en) * | 2004-05-12 | 2008-01-22 | Kulicke And Soffa Industries, Inc. | Low-profile capillary for wire bonding |
KR100642071B1 (ko) * | 2005-03-03 | 2006-11-10 | 이정구 | 개선된 보틀 넥을 갖는 미세피치 본딩용 캐필러리 및 그 제조방법 |
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KR101319691B1 (ko) * | 2006-07-03 | 2013-10-17 | 쿨리케 앤드 소파 인더스트리즈, 인코포레이티드 | 개선된 마무리의 본딩 공구 |
KR101221928B1 (ko) * | 2007-07-24 | 2013-01-14 | 스몰 프리시젼 툴즈 인코포레이티드 | 다수의 외측 단차를 갖는 와이어 본딩용 캐필러리 툴 |
US20090127317A1 (en) * | 2007-11-15 | 2009-05-21 | Infineon Technologies Ag | Device and method for producing a bonding connection |
JP5376413B1 (ja) * | 2013-01-25 | 2013-12-25 | Toto株式会社 | ボンディングキャピラリ |
TWI534919B (zh) * | 2014-03-17 | 2016-05-21 | 矽品精密工業股份有限公司 | 銲線形成方法及其銲線設備 |
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- 2002-05-08 CN CNB028067428A patent/CN1255241C/zh not_active Expired - Fee Related
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CN1516633A (zh) | 2004-07-28 |
KR20040010604A (ko) | 2004-01-31 |
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