CN100466688C - 内置有图像传感器的带透镜的小型照相机模块 - Google Patents

内置有图像传感器的带透镜的小型照相机模块 Download PDF

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CN100466688C
CN100466688C CNB2006101150976A CN200610115097A CN100466688C CN 100466688 C CN100466688 C CN 100466688C CN B2006101150976 A CNB2006101150976 A CN B2006101150976A CN 200610115097 A CN200610115097 A CN 200610115097A CN 100466688 C CN100466688 C CN 100466688C
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lens
filter
camera module
mentioned
small
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CN1921567A (zh
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中条博则
佐佐木道夫
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Toshiba Corp
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Toshiba Corp
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    • G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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Abstract

在基板上安装图像传感器。在上述基板上进一步形成基座。上述基座在上述图像传感器的上方具有开口部。在上述基座的开口部上固定滤光器。上述滤光器在其周边部分上具有凸起形状的挡板部件。在上述滤光器上方配置保持透镜的透镜镜筒。

Description

内置有图像传感器的带透镜的小型照相机模块
(相关申请的交叉引用)
本申请基于2005年8月24日提交的在先日本专利申请No.2005-243138并要求其优先权，在此引入其全部内容作为参考。
技术领域
本发明涉及内置有CCD(Charge Coupled Device：电荷耦合器件)或者CMOS传感器等的图像传感器的带透镜的小型照相机模块。
背景技术
近年来一直在开发内置CCD或者CMOS传感器等的图像传感器的带透镜的小型照相机模块(例如，参照日本专利申请特开2004-88181号公报)。小型照相机模块经组装到手机、便携信息终端等中而产品化。
小型照相机模块通常在图像传感器上具有防护玻璃罩(coverglass)或者IR(infrared radiation：红外辐射)截止滤光器、光学低通滤光器等的滤光器。该滤光器的作用是：密封图像传感器上的空间，降低在组装工序的后半工序中产生的灰尘(dust)所引起的缺陷；通过蒸镀在保护玻璃罩上的无反射涂层和红外截止涂层等，实现自然的颜色再现性。
作为涉及这种滤光器的现有技术的问题点，有在组装后产生的移动污染物(contaminant)引起的缺陷。这种缺陷虽然在出厂前检验时判定为正品，但在运输和在市场上使用等过程中，存在于管内的灰尘移动到有效区域而成为黑点、斑点(spotting)等的缺陷。作为这些移动污染物的发生源，有IR截止滤光器的碎屑(chipping)和将IR截止滤光器粘接到基座上时使用的粘接剂等的渗出，或者在使透镜镜筒(lens barrel)移动时从螺纹(screw)部掉出的灰尘等。
发明内容
从第1方面看的本发明的小型照相机模块具备：安装在基板上的图像传感器；形成在上述基板上的基座，上述基座在上述图像传感器的上方具有开口部；固定在上述基座的开口部上的滤光器，上述滤光器在其周边部分上具有凸起形状的挡板部件；以及配置在上述滤光器上方、保持透镜的透镜镜筒。
从第2方面看的本发明的小型照相机模块具备：安装在基板上的图像传感器；形成在上述基板上的基座，上述基座在上述图像传感器的上方具有开口部，在上述开口部附近具有凸起部；固定在上述基座的开口部上的滤光器；以及配置在上述滤光器上方、保持透镜的透镜镜筒。
从第3方面看的本发明的小型照相机模块具备：安装在基板上的图像传感器；形成在上述基板上的基座；上述基座在上述图像传感器的上方具有开口部，在上述开口部附近具有沟部；固定在上述基座的开口部上的滤光器；以及配置在上述滤光器上方、保持透镜的透镜镜筒。
附图说明
图1是表示本发明的实施方式1的小型照相机模块的结构的剖面图。
图2A、2B、2C是在表示上述实施方式1的小型照相机模块中的IR截止滤光器14的制造方法的示意图。
图3是表示本发明的实施方式2的小型照相机模块的结构的剖面图。
图4是表示本发明的实施方式3的小型照相机模块的结构的剖面图。
具体实施方式
以下，参照附图说明本发明的实施方式。在说明时，在全部图中，在共同的部分上标注共用的参照符号。
[实施方式1]
说明本发明的实施方式1的小型照相机模块。
图1是表示实施方式1的小型照相机模块的结构的剖面图。
如图1所示，小型照相机模块具备：基板11；图像传感器芯片12；基座13；IR截止滤光器14；透镜托架15；透镜镜筒16；第1透镜17；第2透镜18；以及透镜限制器19。在图像传感器芯片12中使用CCD或者CMOS传感器等。IR截止滤光器14是截止预定的红外线的滤光器。
在基板11上安装图像传感器芯片12。进而，在基板11上以及图像传感器芯片12的上方形成基座13。基座13在图像传感器芯片12上方具有开口部。在基座13的开口部上固定IR截止滤光器14，在IR截止滤光器14的周边部分上形成凸起形状的挡板部件14A。在此，用基座13以及IR截止滤光器14密封图像传感器芯片12上的空间。另外，挡板部件14A既可以使用通常的浇注材料(potting material)，也可以使用环氧树脂等的粘接剂。
在基座13上形成透镜托架15。另外，透镜镜筒16具有光圈，保持第1透镜17、第2透镜18。换句话说，为使通过透镜镜筒16的光圈的光入射到透镜17、18，用透镜限制器19把透镜17、18固定在透镜镜筒16上。用透镜托架15和透镜镜筒16形成螺纹，通过该螺纹的行进使透镜镜筒16上下移动来调整透镜17、18的位置。而且，此处虽然表示了分别形成基座13和透镜托架15的情况，但它们也可以被形成为一体。
透镜17、18、IR截止滤光器14以及图像传感器芯片12配置在光轴上，通过了透镜镜筒16的光圈的光通过透镜17、18，并进一步通过IR截止滤光器14在图像传感器芯片12的表面上成像。
在具有这种结构的小型照相机模块中，在IR截止滤光器14的周边部分上形成凸起形状的挡板部件14A。该挡板部件14A防止IR截止滤光器14的碎屑和将IR截止滤光器14粘接到基座13上时使用的粘接剂等的渗出，或者从用于使透镜镜筒16移动的螺纹部掉出的灰尘等的移动污染物移动到IR截止滤光器14上。由此，可以减少虽然在出厂前的检验时判定为正品，但在运输和在市场中使用等时在管内存在的灰尘移动到有效区域而变成黑点和斑点等的缺陷。
接着，说明具有挡板部件14A的IR截止滤光器14的制造方法。通常，IR截止滤光器14通过把称为大开本的玻璃板按所使用的大小一个一个地分割开而制成。在玻璃板的分割中，利用在通常的半导体的组装工艺中用于晶片的切割中的划片(dicing)装置。
图2A是玻璃板的平面图，图2B是已分割的IR截止滤光器14的平面图，图2C是IR截止滤光器14的剖面图。
首先，如图2A所示，在玻璃板20上把挡板部件20A形成为网格形状。挡板部件20A既可以使用通常的浇注材料，也可以使用环氧树脂等粘接剂。接着，通过划片从挡板部件20A上切断玻璃板20，如图2B所示，制成各个IR截止滤光器14。此时，通过把挡板部件20A的宽度设定为比划片刀口的宽度还宽的预定的宽度，能够在划片后的IR截止滤光器14的周边部分上使挡板部件14A以凸缘(flange)形状留下。
如上所述，如果采用本实施方式1，则用形成在IR截止滤光器14的周边部分上的挡板部件14A，可以防止在组装后产生的移动污染物移动到有效区域的现象。由此，能够降低由于在组装后产生的移动污染物所导致的黑点、斑点等的缺陷。
[实施方式2]
接着，说明本发明的实施方式2。在和上述实施方式1中的结构相同的部分上标注相同的符号并省略其说明。
图3是表示实施方式2的小型照相机模块的结构的剖面图。
在实施方式2的小型照相机模块中的基板11上以及图像传感器芯片12的上方形成基座21。基座21在图像传感器芯片12的上方具有开口部，在开口部的附近形成凸起部21A。进而，在基座21的开口部上固定着IR截止滤光器14。其他结构和实施方式1的小型照相机模块相同。
在具有这样的结构的小型照相机模块中，在基座21的开口部附近形成凸起部21A。该凸起部21A防止IR截止滤光器14的碎屑和将IR截止滤光器14粘接到基座21上时使用的粘接剂等的渗出，或者从用于移动透镜镜筒16的螺纹部掉出的灰尘等的移动污染物移动到IR截止滤光器14上。由此，可以减少虽然在出厂前的检验时判定为正品，但在运输和在市场中使用等时在管内存在的灰尘移动到有效区域而变成黑点、斑点等的缺陷。
[实施方式3]
接着，说明本发明的实施方式3。在和实施方式1中的结构相同的部分上标注相同符号并省略其说明。
图4是表示实施方式3的小型照相机模块的结构的剖面图。
在实施方式3的小型照相机模块中的基板11上以及图像传感器芯片12的上方形成基座22。基座22在传感器芯片12的上方具有开口部，在开口部的附近形成沟部(凹部)22A。进而，在基座22的开口部上固定着IR截止滤光器14。其他结构和实施方式1的小型照相机模块相同。
在具有这种结构的小型照相机模块中，在基座22的开口部附近形成沟部22A。该沟部22A防止IR截止滤光器14的碎屑和将IR截止滤光器14粘接到基座22上时使用的粘接剂等的渗出，或者从用于使透镜镜筒16移动的螺纹部掉出的灰尘等的移动污染物移动到IR截止滤光器14上。由此，可以减少虽然在出厂前的检验时判定为正品，但在运输和在市场中使用等时在管内存在的灰尘移动到有效区域而变为黑点、斑点等的缺陷的现象。即，在上述的各实施方式中，为了防止粘接剂和移动污染物等移动到IR截止滤光器14上，只要在基座和滤光器之间设置凸起(或者沟)即可。
如果采用本发明的实施方式，则可以提供能够降低在组装后产生的移动污染物所导致的黑点、斑点等的缺陷的小型照相机模块。
另外，上述的各实施方式不仅可以分别单独实施，而且也可以适宜地组合实施。进而，在上述的各实施方式中包含各种阶段的发明，通过在各实施方式中公开的许多构成要件的适宜的组合，也能够抽出各种阶段的发明。
本领域技术人员容易想到其它优点和变更方式。因此，本发明就其更宽的方面而言不限于这里示出和说明的具体细节和代表性的实施方式。因此，在不背离由所附的权利要求书以及其等同物限定的一般发明概念的精神和范围的情况下，可以进行各种变型。

Claims (4)

1、一种小型照相机模块，包含:
安装在基板上的图像传感器；
形成在上述基板上的基座，上述基座在上述图像传感器的上方具有开口部；
固定在上述基座的开口部上的滤光器；
形成在上述基座上的透镜托架；
保持配置在上述滤光器上方的透镜、并且与上述透镜托架形成螺纹部的透镜镜筒，通过上述透镜镜筒在上述螺纹部上移动来调整上述透镜的位置；以及
设置在上述滤光器的周边部分上的凸起形状的挡板部件，上述凸起形状的挡板部件在配置了上述透镜的方向上凸起。
2、如权利要求1所述的小型照相机模块，
其中，固定在上述基座的开口部上的滤光器的上表面与上述基座的上表面相比位于下方。
3、如权利要求1所述的小型照相机模块，
其中，上述透镜镜筒具有光圈，从上述光圈入射的光通过上述透镜以及上述滤光器在上述图像传感器上成像。
4、如权利要求1所述的小型照相机模块，
其中，上述挡板部件包含浇注材料以及环氧树脂中的任一种。
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