CN100409047C - 导光体及图像读取装置 - Google Patents

导光体及图像读取装置 Download PDF

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CN100409047C
CN100409047C CNB2004800179726A CN200480017972A CN100409047C CN 100409047 C CN100409047 C CN 100409047C CN B2004800179726 A CNB2004800179726 A CN B2004800179726A CN 200480017972 A CN200480017972 A CN 200480017972A CN 100409047 C CN100409047 C CN 100409047C
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light
light conductor
face
exit facet
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CN1813208A (zh
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池田诚
根本浩之
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Nippon Sheet Glass Co Ltd
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    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • H04N2201/03195—Coating, e.g. light adsorbing layer

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

Abstract

本发明反向利用了复合抛物面聚光器(CPC)的特性，将来自某限定区域的遍及全部角度的散射光转换成限定于预定出射角的辐射光，以便将光的扩散抑制到最低限度，并高效地照亮原稿面。在使由端面射入的光经内面反射同时从沿着长度方向设置的出射面4射出的导光体10中，与长度方向正交的方向的剖面形状包含：面对的2条抛物线2和3、连接2条抛物线2和3的焦点a和b的线段(底面)1、相当于出射面4的线段。另外，在连接焦点a和b的线段(底面)1上形成由白色油墨构成的散射图案。

Description

导光体及图像读取装置
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
现已提出了一种以将来自光源的光有效地对被照射物照射为目的，使用在导光体剖面具有抛物线的面的导光体的技术(例如，参照专利文献1)。
另外，忽视成像性以便实现提高聚光效率的复合抛物面聚光器(CPC)是众所周知的(非专利文献1)。
专利文献1：特开2001-330734号公报
非专利文献1：书名第6·光的铅笔5非成像聚光光学***作者：鹤田匡夫
发明内容
本发明试图解决的课题
来自导光体的射出光具有扩散性。因此，当原稿与出射面的距离很大时，原稿读取面的亮度下降，这样不理想。
但是，如非专利文献1所述，复合抛物面聚光器(CPC)是为了有效聚光而提出的光学***，以入射角θ以内的角度射入受光面的光都具有聚集于聚光面的特性。
因此，本发明的目的是提供一种导光体及使用该导光体的线照明装置，该导光体反向地利用复合抛物面聚光器(CPC)的特性，将来自某限定区域的遍及全部角度的散射光转换成限定于预定出射角的辐射光，作为高效地照亮原稿面的光学***，由此可将光的扩散抑制到最低限度。
课题解决办法
为了解决上述课题，本发明的导光体使由导光体的两端面射入的光经内面反射同时从沿长度方向设置的出射面射出，与长度方向正交的方向的剖面形状具有：面对的2条抛物线、连接2条抛物线的焦点的线段、相当于出射面的线段。包含上述连接2条抛物线的焦点的线段的面成为反射面，与该反射面对应的面成为出射面。
利用上述结构，能够抑制从出射面射出的光的扩散。为了使光最高效地射出，最好是将导光体的出射面一侧的侧面设置为大致平行于出射光的光轴。
另外，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到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反向地利用复合抛物面聚光器(CPC)的特性，将来自某限定区域的遍及全部角度的散射光转换成限定于预定出射角的辐射光，作为高效地照亮原稿面的光学***使用，因此可将光的扩散抑制到最低限度。由此，能够高效地照亮原稿面。
附图说明
图1是表示具有本发明的复合抛物面形状的导光体的剖面形状的图。
图2是表示图1所示的本发明的导光体的出射光的图。
图3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4是表示作为设置于本发明的导光体的端面的光源的各发光二极管的安装位置的图。
图5是表示本发明的其他导光体的剖面形状的图。
图6是表示本发明的其他导光体的剖面形状的图。
图7是表示具备复合抛物面反射镜的线照明装置的剖面形状的图。
具体实施方式
下面根据附图说明本发明的实施方式。图1是表示具有本发明的复合抛物面形状的导光体的剖面形状的图，图2是表示图1所示的本发明的导光体的出射光的图。
导光体10由例如丙烯酸等透明树脂形成，其剖面形状在导光体10的全长上(例如320mm)均是一定的。
导光体10的底面1的宽度W为0.52mm，该底面1上形成有以白色油墨或木纹的细凹凸所构成的散射图案。散射图案形成如例如点状。
该散射图案既可形成于底面1的整个面，也可以随着远离来自未图示的发光源的光所射入的端面而逐渐扩大散射图案的形成区域。
侧面2是以原点(x，y)＝(0，0)为旋转中心将以虚线表示的2次曲线(y＝0.81927x2-0.30515)旋转θ＝10度，并在x轴方向平行移动-W1/2＝-0.26mm后的曲线的一部分(y的范围：0≤y≤9.97)。将以虚线表示的2次曲线倾斜，使出射面4一侧的侧面2与y轴(光轴)大致平行。侧面3是侧面2的y轴线对称曲线。
这种情况下，座标(x，y)＝(-0.26，0)成为抛物面即侧面2的焦点a。如图2所示，在来自该焦点a的散射光中，直接到达侧面2的光满足全反射条件，相对于y轴，在导光体10的内部成为倾斜10度的平行光，到达出射面4。
当导光体10是丙烯酸、并且其折射率为n＝1.49时，
1.49·sin10度＝sinθd(斯涅尔定律)(Snell’s Law)
则θd＝15度。
因此，如图2中符号5所示光线那样，相对于y轴倾斜15度的平行光从出射面4射出。
另一方面，在来自焦点a的散射光中，直接到达出射面4的光在穿过座标(x，y)＝(1.50，9.97)时，如图2中符号6所示的光线那样相对于y轴倾斜-15度。
同样地，坐标(x，y)＝(0.26，0)成为抛物面即侧面3的焦点b。在来自该焦点b的散射光中，直接到达侧面3的光满足全反射条件，相对于y轴，在导光体10的内部成为倾斜-10度的平行光，到达出射面4。
因此，来自区间(-0.26≤x≤0.26，y＝0)的散射光(即来自底面1的散射光)包含直接到达侧面3的散射光的反射，相对于y轴限定于±15度的范围之内。
由此，能够将从出射面4射出的光的扩散抑制到很小，其结果是，能够高效地照亮原稿面。
图3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4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3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。
各个线照明装置20L、20R由图1及图2所示的导光体10、导光体盒11、及具有图4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4所示，沿着y轴(光轴)按一列配置各发光二极管12R、12G、12B。由此，形成于导光体10的底面1上的散射点状图案的法线与各发光二极管12R、12G、12B的光轴达到一致。
来自发光二极管12R、12G、12B的光在导光体10的内部传输，在底面1产生散射光。如图3所示，该散射光在各侧面2、3反射，或者直接从出射面4射出，成为照亮放置在覆盖玻璃35上未图示的原稿的读取面的照明光7。
在未图示的原稿的读取面反射的照明光7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。
由各导光体10射出的照明光相对于y轴(光轴)限定于±15度的范围，因此即使到原稿为止的距离很大，也能够抑制照明光的扩散。因此，能够高效地照亮原稿面。
图5是表示本发明的其他导光体的剖面形状的图。图5所示的导光体10A将出射面8作成凸面以缩小出射光的扩散角度。
图6是表示本发明的其他导光体的剖面形状的图。与该导光体的长度方向正交的方向的剖面形状包含由椭圆曲面形成的侧面2′、3′、底面1′及出射面4′，底面1′的两端与侧面2′、3′的焦点a′、b′一致。
即，由具有1.6∶6的纵横比的椭圆曲线
(x/1.6)2+(y/6)2＝1
求出焦点座标，则成为：
x＝0、y＝f＝-(6×6-1.6×1.6)0.5
y为区间
(f≤y≤0)、f＝-(6×6-1.6×1.6)0.5
中的变量，该区间的椭圆曲线为
x＝1.6(1-(y/6)2)0.5
这里，
当以y＝f时的x作为x0(＝0.42667)时的情况下，通过将导光体的侧面作为曲线
x＝1.6(1-(y/6)2)0.5-x0/2
底面1′的两端与侧面(椭圆曲线)2′、3′的焦点a′、b′一致。
将图6所示的导光体作为图3所示的20L、20R使用时，可以利用传感器33检测出与使用图1的导光体时几乎同等的输出。
除了上述图示实例之外，也可以将抛物面2、3或椭圆曲线2′、3′形成为左右不对称，以改变左右的扩散角度。
图7是表示具备复合抛物面反射镜的线照明装置的剖面形状的图。图7所示的线照明装置60使从例如剖面形状为矩形的导光体61的出射面62射出的光在抛物面侧面的反射镜63、64反射，从开口部65作为照明光射出。符号66是塑料盒体。该线照明装置60在折射率介质中没有反射面，因此可以抑制扩散角度。即，复合抛物面反射镜63、64内部是空气，因此光从照明光的出口即开口部65射出时不会扩散。

Claims (4)

1. 一种导光体，是使由导光体的两端面射入的光经内面反射，并同时由沿着长度方向设置的出射面射出的导光体，其特征在于，与上述长度方向正交的方向的剖面形状具有：面对的2条抛物线或2条椭圆曲线；连接上述的2条抛物线的焦点或2条椭圆曲线的焦点的连接线段；相当于上述出射面的线段。
2. 如权利要求1所述的导光体，其特征在于，上述出射面一侧的导光体的侧面与出射光的光轴大致平行。
3. 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或权利要求2所述的导光体的端面上设置发光源，该透镜阵列用来使由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。
4. 如权利要求3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，各照明单元被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。
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