CN101059222A - 导光体及线照明装置 - Google Patents

导光体及线照明装置 Download PDF

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CN101059222A
CN101059222A CNA2007101064710A CN200710106471A CN101059222A CN 101059222 A CN101059222 A CN 101059222A CN A2007101064710 A CNA2007101064710 A CN A2007101064710A CN 200710106471 A CN200710106471 A CN 200710106471A CN 101059222 A CN101059222 A CN 101059222A
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light
face
light conductor
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池田诚
根本浩之
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Nippon Sheet Glass Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
    • H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array
    • H04N1/031—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array the photodetectors having a one-to-one and optically positive correspondence with the scanned picture elements, e.g. linear contact sensors
    • H04N1/0318—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light-source, a lens array and a photodetector array which are supported by a single-piece frame
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
    • H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
    • H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
    • H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
    • H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
    • H04N2201/03108—Components of integral heads
    • H04N2201/03112—Light source
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
    • H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
    • H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
    • H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
    • H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
    • H04N2201/03108—Components of integral heads
    • H04N2201/03125—Light guide upstream of the scanned picture elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
    • H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
    • H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
    • H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
    • H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
    • H04N2201/03108—Components of integral heads
    • H04N2201/03141—Photodetector lens
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
    • H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
    • H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
    • H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
    • H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
    • H04N2201/03108—Components of integral heads
    • H04N2201/03145—Photodetector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
    • H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
    • H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
    • H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
    • H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
    • H04N2201/0315—Details of integral heads not otherwise provided for
    • H04N2201/0317—Shape

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Heads (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)

Abstract

本发明提供一种使被照射物的位置(原稿位置)的光的纵向强度分布具有展宽，因而即使原稿面浮起也能够降低读取图像恶化的导光体及组装了该导光体的线照明装置。本发明的导光体(10)使由端面射入的光在内面反射，同时由沿长度方向设置的出射面射出，与长度方向正交的方向的侧面形状包含：第1椭圆弧曲面(1)、第2椭圆弧曲面(2)、第1出射面(3)、第2出射面(4)、及形成于各椭圆长轴平面的椭圆焦点位置(或靠近焦点位置)的光散射部(5)。由第1曲面所反射的光的聚光位置与由第2曲面所反射的光的聚光位置不同。

Description

导光体及线照明装置
本申请系申请号为200480017904.X、申请日为2004年6月18日、发明名称为“导光体及线照明装置”的发明专利申请的分案申请。
技术领域
本发明涉及一种在传真机、复印机、扫描仪装置等中用于对原稿进行线条(线状)照明的导光体及组装了该导光体的图像读取装置。
背景技术
为了将来自光源的光有效地对被照射物照射，已经提出了将侧面作成抛物线面或椭圆弧面的导光体(例如，专利文献1、专利文献2)。
专利文献1：特开2001-330734号公报
专利文献2：美国专利第6,259,082号公报
发明内容
本发明试图解决的课题
来自导光体的出射光的焦点存在的问题是，其深度较浅，远离焦点的被摄体亮度较暗。因此，由于原稿的折痕及双联页部分等导致放置在原稿台等之上的原稿浮起时，照明光量会降低，会在线图像传感器等所读取的图像上产生不自然的阴影。
本发明是为了解决这样的课题而做，其目的是提供一种使被照射物的位置(原稿位置)的光的纵向的强度分布具有展宽性，从而即使在原稿面浮起的情况下也可以减少读取图像的恶化的导光体及组装了该导光体的线照明装置。
课题解决办法
为了解决上述课题，本发明的导光体使由端面射入的光在内面反射，同时由沿着长度方向设置的出射面射出；与长度方向正交的方向的侧面形状(沿长度方向的2个侧面形状)具有2个椭圆弧或2个抛物线曲面，其结构为，由一个曲面反射的光的聚光位置与由另一个曲面反射的光的聚光位置不通。
在上述情况下，导光体由例如2个半块贴合而成，每一个半块上形成作为反射面的椭圆弧或抛物线曲面。此外，导光体也可以不分为2个半块，而是一体地成形。
另外，本发明的导光体使由端面射入的光在内面反射，同时由沿着长度方向设置的出射面射出；与长度方向正交的方向的侧面形状的结构具有焦距不同的2个椭圆弧曲面。
进一步，本发明的导光体使由端面射入的光在内面反射，同时由沿着长度方向设置的出射面射出；与长度方向正交的方向的侧面形状的结构为具有至少1个曲面，该曲面具备焦距不同的2个椭圆弧曲面区域。
本发明的图像读取装置具备2组例如在上述导光体的一端或两端设置了发光源的照明单元，各个照明单元配置为从各个出射面射出的光可照射原稿读取面的同一区域。
发明的效果
本发明的导光体及使用该导光体的线照明装置可以通过将焦点位置不同的导光体组合起来，在预定位置和深度提供理想的光分布特性。即，通过在被照射物位置(原稿位置)的光的纵向强度分布具有展宽性，从而即使在原稿面浮起的情况下也可以减少读取图像的恶化，能够读入优质的图像。
附图说明
图1是表示本发明的导光体的第1实施方式的剖面形状图。
图2是具备组装了本发明的导光体的线照明装置的接触式图像传感器(CIS)的剖面图。
图3是表示作为设置于本发明的导光体的端面的光源的各个发光二极管的安装位置的图。
图4是表示本发明的其他导光体的剖面形状的图。
图5是表示本发明的其他导光体的剖面形状的图。
图6是表示本发明的另外一个导光体的剖面形状的图。
图7是表示本发明的另外一个导光体的剖面形状的图。
具体实施方式
下面根据附图说明本发明的实施方式。图1是表示本发明的导光体的第1实施方式的剖面形状图。
导光体10由例如丙烯酸等透明树脂所形成的两个半块10A、10B贴合而成，其剖面形状在导光体10的全长上(例如320mm)是一定的。
其中的一个半块10A上形成的第1曲面1具有由
            [{x-(f1-f2)}/10.6]2+(y/3.5)2≤1
并且-f2≤x≤f1-f2，y≤0所表示的区域的形状。
其中的一个半块10B上形成的第2曲面2具有由
            (x/9.2)2+(y/2.0)2≤1
并且-f2≤x≤0，y≥0所表示的区域的形状。
但是，f1＝10.0＝(10.62-3.52)0.5
f2＝9.0＝(9.22-2.02)0.5
x＝-f1，y＝0是曲线1的焦点座标，
x＝-f2，y＝0是曲线2的焦点座标。
这里，在x＝-f2+Δ，y＝0的区域设有由白色油墨印刷的图案所构成的光散射部5。符号6是底面。
如果导光体10内部有传输光，则到达由印刷图案构成的光散射部5的传输光就会被散射，并分别在各曲面1、2全反射，从各出射面3、4射出。
在曲面1反射的出射光集聚到座标x＝7.7(＝f1/N+(f1-f2))，y＝0附近。其中，N是批量折射率(ロツド屈折率)，当导光体10是丙烯酸酯制造时N＝1.49。
在曲面2反射的出射光集聚到座标x＝6.0(＝f2/N)，y＝0附近。
其中，N是批量折射率，当导光体10是丙烯酸酯制造时N＝1.49。
如果将光散射部5形成于长轴面，则出射面就会位于几乎没有散射指向性的方向上，因而散射光会在椭圆面上反射后射出。依照此种方式，将光散射部5形成于椭圆的长轴平面上，就能够抑制朝向出射面的直接辐射光，借助于椭圆反射面提高聚光效率。图中，虚线表示光散射部5的镜像7。在包含椭圆焦点或其附近的垂直平面(与长轴正交的平面)将椭圆的长轴一侧的顶端部位倒角，可使光散射部5的镜像也位于长轴平面上的焦点附近，同样地，损耗较小(有助于镜像反射)。
此外，导光体10虽然图示为将具有椭圆弧曲面1的大致为1/4椭圆形状的导光体与具有椭圆弧曲面2的大致为1/4椭圆形状的两个半块10A、10B贴合而成，但也可以一体成形。另外，本实施方式中各曲面呈椭圆弧状，但各曲面也可以呈抛物线状。
图2是具备组装了本发明的导光体的线照明装置的接触式图像传感器(CIS)的剖视图，图3是表示作为设置于本发明的导光体的端面的光源的各个发光二极管的安装位置的图。
图2所示的接触式图像传感器(CIS)30具备框体31，该框体31中组装了2组线照明装置20L、20R，另外，框体31中配置正像等倍系透镜阵列32，进一步在框体31的下部安装设有线图像传感器33的基板34。符号35是构成原稿台的覆盖玻璃。
正像等倍系透镜阵列32宜采用焦点深度较深的透镜。通过使用焦点深度较深的透镜，即使在原稿面浮起的情况下也可以读取成鲜明的图像。此外，当无论焦点深度有多深照明光都无法到达的情况下，无法读取成像，因此，为了获得鲜明的图像，最好是使照明系与正像等倍系两者都满足预定的条件，即，正像等倍系中焦点深度要深，照明系中则在该焦点深度的范围内以均匀亮度照明。
各个线照明装置20L、20R由图1所示的导光体10、导光体盒11、及具有图3所示的各发光二极管12R、12G、12B的发光源基板(未图示)构成。各发光二极管12R、12G、12B分别发出红色、绿色、蓝色光，这些发光二极管12R、12G、12B采用芯片型(LED芯片)。
本实施方式中，如图3所示，沿着图1所示的x轴按一列配置各发光二极管12R、12G、12B。
来自发光二极管12R、12G、12B的光在导光体10的内部传输，在光散射部5发生散射。如图2所示，该散射光在各曲面1、2反射。曲面1产生的反射光聚光到距覆盖玻璃35上面向上0.4mm的位置，曲面2产生的反射光聚光到其前方1.7mm的位置(距覆盖玻璃35上面向上1.6mm的位置)。
此外，在未图示的原稿的读取面反射的照明光介由覆盖玻璃35和透镜阵列32，由线图像传感器33检出。由此可读出原稿。
如图2所示，具备组装了本发明的导光体的线照明装置20L、20R的接触式图像传感器(CIS)30在x＝5.2mm的位置(透镜阵列32及线图像传感器33的中心位置)其光量变化在y＝0～2mm(距覆盖玻璃35上面向上到2mm的范围)内保持在5％以内。
因此，即使原稿产生浮起，原稿面的照明光量变化也极小，能够获得优质的读取图像。
图4是表示本发明的其他导光体的剖面形状的图。图4所示的导光体40取消了各出射面3A、4A的高低差异。
图5是表示本发明的另外一个导光体的剖面形状的图。图5所示的导光体50使各出射面3B、4B倾斜，具有由棱镜形成的偏向效果。
图6是表示本发明的另一个导光体的剖面形状的图。图6所示的导光体60将曲率不同的第1及第2椭圆区间组合形成1个曲面。
图7是表示本发明的另一个导光体的剖面形状的图。图7所示的导光体70将导光体一体成形，与图2所示的实施方式一样，第1曲面71具有以
            [{x-(f1-f2)}/10.6]2+(y/3.5)2≤1
并且-f2≤x≤f1-f2，y≤0所表示的区域的形状，第2曲面72具有以
(x/9.2)2+(y/2.0)2≤1并且-f2≤x≤0，y≤0所表示的区域的形状。另外，在与出射面73相对的底面74上设有由白色油墨印刷的图案所构成的光散射部75。

Claims (3)

1.一种导光体，其特征在于，是使由端面射入的光在沿长度方向的侧面的内侧面反射，同时从沿长度方向设置的出射面射出的导光体，上述侧面形状具备焦距不同的2个椭圆弧曲面区域，由各个椭圆弧曲面所反射的光的聚光位置不同。
2.一种图像读取装置，其特征在于，在框体中组装了照明单元和透镜阵列，该照明单元在权利要求1所述的导光体的端面上设置了发光源，该透镜阵列使从该照明单元向原稿照射、经原稿反射或透过原稿的光集聚到受光元件。
3.如权利要求2所述的图像读取装置，其特征在于，配置了2组上述照明单元，各照明单元配置成由各出射面射出的光照射到原稿读取面的同一区域。
CNA2007101064710A 2003-06-25 2004-06-18 导光体及线照明装置 Pending CN101059222A (zh)

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WO2005001529A1 (ja) 2005-01-06
WO2005001529A9 (ja) 2005-07-14
KR20060016121A (ko) 2006-02-21
US20060152805A1 (en) 2006-07-13

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