CN1538107A - 车用灯具的透镜 - Google Patents
车用灯具的透镜 Download PDFInfo
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Abstract
本发明提供一种车用灯具透镜,形成在双色成形透镜的单层部分颜色不混合的结构,开灯和不开灯时的外观都很好。该车用灯具的透镜结构如下:在后浇铸的表面颜色浅的第二树脂层24里面的规定位置上,使先浇铸的颜色深的第一树脂层26层压成形。在叠层部23中,第二树脂层24向第一树脂层26侧隆起,第一、第二树脂层的界面25向第一树脂层26偏离规定距离δ。虽然先浇铸的第一树脂层26与后浇铸的熔融状态的第二树脂24接触,一部分熔融,被第二树脂24的流动牵引,但与第二树脂层24向第一树脂层26侧的隆起部24b对应的内腔部C1内的台阶部44b作为阻止熔融的第一树脂26向第二树脂层24内流动的障壁发挥作用,可以得到深色的第一树脂24没有混入浅色的第一树脂层26内,不开灯时外观良好,发光面积大的前面透镜20。
Description
技术领域
本发明涉及下述车用灯具的透镜,其在表面一侧颜色浅的第二树脂层的里侧规定位置上层压成形颜色深的第一树脂层。
背景技术
作为该种透镜的现有技术,已有下述车用灯具的透镜,如图8所示,在表面浅色(如透明(クリア))的第二树脂层2的里面周边位置上层压成形深色(如黑色)的第一树脂层1。符号1a是沿透镜里面周边形成的密封插脚。
为了成形该透镜,首先移装先浇铸成形的一次成形品(深色的第一树脂层1),插入金属模a、b内,后浇铸浅色的第二树脂层2,并层压成形,符号G是第二树脂注射模塑成形用的侧门。
但是,当后浇铸的第二树脂层2注射模塑成形时,先浇铸的第一树脂层1由于与后浇铸的熔融状态的第二树脂层2接触,一部分熔融,如图8箭头A所示,熔融了的第一树脂1被第二树脂2的流动所牵引,如符号1b所示,混入第二树脂层2中,存在所谓灯没开时外观不好,灯开时不按规定的功能色发光的问题。
在下述特许文献1(参照图9(a)、(b))中,公开了以下结构的车用灯具透镜,其在表面一侧浅色(如透明)的第二树脂层2的里面周边位置上,使深色的第一树脂层1层压成形。在先浇铸的第一树脂层1开口部的周边形成嵌入后浇铸第二树脂2时的第一树脂1的凸部4,在凸部4内包住第一树脂1的溶入部1b,在透镜发光部5中,第一树脂1的溶入部1b没有混入。这样的结构是大家所熟知的。图9(b)中的箭头表示金属模射出的第二树脂2的流动方向。
[特许文献1]实开平5-90708号(图3、4)
然而,特许文献1所示的透镜,在透镜的发光部5确实没有混入第一树脂1,但是,与凸部4相当的金属模的内腔形状变复杂,与凸部4相当的发光部5的大小变小,开灯时透镜的发光面积缩小。进而存在灯具没开时,由一层第二树脂构成的发光部5的周边部(凸部4)污染并可以看出,外观变差的问题。
本发明是鉴于上述现有技术的问题提出的,目的在于提供一种车用灯具的透镜,由于其作成金属模的内腔形状没有被复杂化,在双色成形透镜的单层部分颜色没有混合的结构,故在开灯时可以确保较大的发光面积,同时不开灯时外观良好。
发明内容
为了达到上述目的,在本发明第一方面涉及的车用灯具的透镜中,其使先浇铸的颜色深的第一树脂层层压成形在后浇铸的表面颜色浅的第二树脂层的里侧规定位置上,上述叠层部如下构成:第二树脂层向第一树脂层一侧隆起,第一、第二树脂层的边界面向第一树脂层一侧偏移。
(作用)在先成形的颜色深的第一树脂层上,使颜色浅的第二树脂层成形为叠层形态。当注射模塑成形该第二树脂层时,先浇铸的第一树脂层虽然由于与后浇铸的熔融状态的第二树脂接触,一部分熔融,被第二树脂的流动牵引,但在叠层部与第二树脂层向第一树脂层一侧隆起部对应的内腔中的台阶部(与第一、第二树脂层的边界面的偏移量相当的台阶部)作为阻止熔融的第一树脂流入第二树脂层内的障壁起作用。
另外,使先浇铸的第一树脂的量减少,其程度仅仅是增加的后浇铸的第二树脂的量就可以,也没有使金属模内的内腔形状变复杂。
本发明的第二方面,在发明第一方面所述的车用灯具的透镜中,至少在后浇铸、流动的第二树脂从叠层移动到单层的区域设置在所述叠层部中的第二树脂层一侧的隆起部。
(作用)由于颜色深的第一树脂向颜色浅的第二树脂层内的混入在后浇铸的第二树脂流动并从双层(叠层)移动到单层的位置上发生,故至少在叠层部的规定区域(第二树脂流动并从双层移动到单层的位置)内设置隆起部即可。
附图说明
图1是使用本发明一实施例的尾部停车指示灯的正面图;
图2是该灯的垂直剖面图(沿图1所示的线II-II的剖面图);
图3是该灯主要部分的前面透镜的剖面图;
图4是表示后浇铸的第二树脂在金属模内流动的剖面图;
图5是说明内腔的台阶部阻止第一树脂向第二树脂内流入的作用的说明图;
图6是作为使用本发明第二实施例的主要部件的尾部停车指示灯的主要部分的前面透镜剖面图;
图7是作为使用本发明第三实施例的主要部件的尾部停车指示灯的主要部分的前面透镜剖面图;
图8是现有的双色成形透镜的剖面图;
图9是现有的另一双色成形透镜的剖面图。
符号说明
10 灯体
11 反射板
14 光源——白色灯泡
16 红色罩
20 20A 20B前面透镜
S 灯室
23 叠层部
24 里面的第一树脂层(黑色丙烯酸树脂层)
24b 第一树脂层的隆起部
25 第一、第二树脂层的界面
26 表面的第二树脂层(透明的丙烯酸树脂层)
26f 插入二次成形用金属模的一次成形品——第一树脂层的表面
40(42,44) 二次成形用金属模
P.L.二次成形用金属模的分型线
C 透镜成形用内腔
C1 叠层部成形用内腔部
C2 第二树脂层成形用内腔部
44a第二树脂层的里面成形面
44b叠层部成形用内腔部内的台阶部
δ 叠层部中第一树脂层向第二树脂层一侧的偏移量
46导引槽
具体实施方式
下面,根据实施例说明本发明的实施方式。
图1至图5表示本发明的一实施例。图1是使用本发明的一实施例的尾部停车指示灯的正面图,图2是该灯的垂直剖面图(沿图1所示的线II-II的剖面图),图3是作为该灯主要部分的前面透镜的剖面图,图4是表示后浇铸的第二树脂在金属模内流动的剖面图,图5是说明内腔的台阶部阻止第一树脂向第二树脂内流入的作用的说明图。
在这些图中,符号10是尾部停车指示灯的容器状的灯体,在灯体10的前面开口部上安装前面透镜20形成灯室S,符号21是靠前面透镜20的里面周边部设置的密封插脚,例如通过超声波焊接固定在灯体10的前缘部上。
在灯体10的内周面上整体形成铝蒸镀的抛物面状的反射板11,同时,在设于灯体10后顶部的灯泡插装孔12中插装有作为光源的白色灯泡14,在白色灯泡14的周围设有其脚部16a固定在灯泡插装孔12周围的红色罩16,由白色灯泡14发出的光(白色)透过红色罩16变成带有红色。
前面透镜20是双色成形透镜,其使形成透镜整个形状的表面侧透明的第二树脂(丙烯酸树脂)层24与在第二树脂层24的里面周边部全部区域及上下方向中央部的左右各自按规定幅度延伸的黑色第一树脂(丙烯酸树脂)层26层压一体化。符号26a表示第一树脂层26的周边部区域,符号26b表示第一树脂层26的上下方向中央的棒状部区域,在第一树脂层26的整个区域内第二树脂层24被层压,构成叠层部23。另外,第一树脂层26没有与第二树脂层24层压在一起,在第二树脂层24的单层区域24a的里面设有左右延伸的圆柱状台阶24s。
而第一树脂层26和第二树脂层24的叠层部23由于在灯不开时通过表面的透明第二树脂层24可以透过看到里面的黑色第一树脂层26,如图1所示,可以看到由透明的第二树脂层24单层构成的左右长的上下两个发光部区域24a,24a用沿透镜周边部的周边部区域26a和上下方向中央的棒状部区域26b组成的叠层部23作成黑色边缘。
而开灯时,由于光不能透过透镜20里面的黑色第一树脂层26,透明的发光部区域24a,24a透过灯室S侧的红色光,发出功能色为红色的光。
在透镜20中的第一树脂层26和第二树脂层24叠积起的叠层部23,如图3符号24b所示,构成第二树脂层24向第一树脂层26侧隆起,第一、第二树脂层26、24的界面25向第一树脂层26侧偏移规定值δ的形态,通过对先浇铸的黑色第一树脂层26后浇铸透明的第二树脂层24,使透镜20层压成形,形成在后浇铸的透明第二树脂层24内完全没有混入黑色第一树脂26的双色成形透镜结构。
即,首先,为了形成透镜20,利用没有图示的一次成形用金属模,使作为规定厚度的一次成形品的深色第一树脂层26成形。其次,将该一次成形品(第一树脂层26)从一次成形用金属模中取出,如图4所示,装入二次成形用金属模40(上下的金属模42、44)内。在二次成形用金属模40(上下的金属模42、44)内设有内腔C,其由在下金属模44侧形成的叠层部成形用内腔部C1和在上金属模42中形成的第二树脂层成形用内腔部C2组成。在叠层部成形用内腔部C1中装入的一次成形品(第一树脂层26)的表面26f,在从沿分型线P.L.几乎笔直延伸的第二树脂层24的里面成形面44a到内腔部C1内只深入规定距离δ的位置(只偏离规定距离δ的位置)。之后,在使金属模40(42、44)合模的基础上,通过设在上金属模42上的导引槽46向金属模40(42、44)的内腔C(C2)射出第二树脂24。向内腔C(C2)内射出的第二树脂24从槽46的位置呈放射状在内腔部C2内流动,填充整个内腔C(C2)。此时,事先装入的一次成形品(第一树脂层26)的表面26f由于与流动的高温熔融状态的第二树脂24接触,一部分熔融,该熔融后的第一树脂26将会被第二树脂24的流动(参照图5白色箭头B1)牵引(参照图5箭头B2)。但是,由于在叠层部23中,与第二树脂层24向第一树脂层26侧的隆起部24b相对应的内腔部C1内的台阶部(相当第一、第二树脂层26、24的界面25的偏移量δ的台阶部)44b作为阻止熔融的第一树脂26流入第二树脂24内的障壁发挥作用,熔融的第一树脂26不混入第二树脂层24内,被留在叠层部成形用内腔部C2内。
其结果,在作为表面透明的第二树脂层24单层区域的发光部区域24a中,完全没有混入黑色第一树脂26的前面透镜20层压成形(参照图3)。
在第一、第二树脂层26、24层合的叠层部23中,第二树脂层24向第一树脂层26侧的隆起部24b的高度(第一、第二树脂层26、24间的界面25向第一树脂层26侧的偏移量)δ,根据本发明者的实验,确认最好为0.2~0.8mm。
上述的实施例,虽然叠层部23内的第二树脂层24整体均匀地向第一树脂层26侧隆起那样构成,但由于二次成形时,熔融的一部分第一树脂26向第二树脂层24内的混入主要发生在后浇铸的第二树脂24流动并从双层(叠层部)移动到单层的位置上,故也可以只在第二树脂24流动并从叠层部移动到单层区域的位置设隆起部。
因而,或如图6所示,在从正面看的前面透镜20A的上下方向的中央部中,只在向左右延伸的叠层部23的第二树脂层24形成隆起部24b,或如图7所示,在从正面看的前面透镜20B的上下方向的中央部中,是向左右延伸的叠层部23的第二树脂层,当二次成形时,在射出的第二树脂24从叠层部23向单层流动侧(从射出的第二树脂24的叠层部23向单层流动的位置)形成隆起部24b,上述两种结构都可以。
上述实施例虽然说明了表面是浅色(透明)的丙烯酸树脂层26,里面是深色(黑色)的丙烯酸树脂层24的双色成形结构,但作为树脂材料不限于丙烯酸树脂,颜色也不限于透明和黑色。
上述实施例对尾部停车指示灯的前面透镜进行了说明,但其对示宽灯、倒车灯、转向指示灯和其它的标识灯用的前面透镜和包含在灯室内的内部透镜也同样可以适用。
发明效果
由以上说明可知,若使用发明第一方面的车用灯具的透镜,由于颜色深的第一树脂没有混入到表面颜色浅的第二树脂层中,在灯具开时,可以得到较大的发光面积,同时,灯不开时,可以得到外观好的透镜,其明确地分成第二树脂层单色部分和第一、第二树脂层的混色部分两种颜色。
由于没有使金属模内的内腔形状变复杂,故金属模的结构和其设计也没有变复杂。
若使用发明的第二方面,颜色深的第一树脂由于含染料和颜料多,与颜色浅的第二树脂相比成本高,但相当隆起部的树脂材料少,由此可以使透镜价格降低。
Claims (2)
1.一种车用灯具的透镜,其中先浇铸的颜色深的第一树脂层在后浇铸的表面一侧颜色浅的第二树脂层的里侧规定位置上层压成形,其特征在于,在该叠层部中,第二树脂层向第一树脂层一侧隆起,第一、第二树脂层的界面向第一树脂层偏移。
2.权利要求1所述的车用灯具透镜,其特征在于,在所述叠层部中的第二树脂层一侧的隆起部至少设在后浇铸并流动的第二树脂从叠层向单层移动的区域中。
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CN106881807A (zh) * | 2015-12-02 | 2017-06-23 | 株式会社小糸制作所 | 树脂成型品 |
US10099413B2 (en) | 2015-12-02 | 2018-10-16 | Koito Manufacturing., Ltd. | Resin-molded component |
CN106881807B (zh) * | 2015-12-02 | 2019-11-26 | 株式会社小糸制作所 | 树脂成型品 |
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CN108302474B (zh) * | 2016-09-28 | 2022-11-08 | 法雷奥照明公司 | 用于获得用于机动车辆的散光组件的方法 |
CN108253376A (zh) * | 2018-01-24 | 2018-07-06 | 上海小糸车灯有限公司 | 车灯结构及安装厚壁注塑小透镜的方法 |
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US20050003159A1 (en) | 2005-01-06 |
DE102004018876B4 (de) | 2009-09-17 |
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JP2004319347A (ja) | 2004-11-11 |
DE102004018876A1 (de) | 2005-03-10 |
KR100592755B1 (ko) | 2006-06-26 |
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FR2853952B1 (fr) | 2008-05-30 |
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