CN1307833C - 照明装置及使用该照明装置的图像传感器 - Google Patents
照明装置及使用该照明装置的图像传感器 Download PDFInfo
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Abstract
本发明公开了一种照明装置,其包括:用于为照明物体照明的光源;反射部件,其设置在光源对面,以便引导从光源发出的照明光的第一部分到照明物体;和遮光部件,其设置在光源和照明物体之间以及反射部件和照明物体之间。遮光部件以特定比例来遮挡照明光的第一引导部分和直接照明所述照明物体的照明光的第二部分,该比例即照明光的第一引导部分的遮光率与照明光的第二直射照明部分的遮光率之比。
Description
技术领域
本发明总地涉及照明装置及图像传感器,具体涉及一种用于原件阅读装置的图像传感器的照明装置及使用该照明装置的图像传感器。
背景技术
能够阅读原件的成像设备例如复印机、传真机和扫描仪都使用包括光源在内的照明装置以便阅读。
某些照明装置包括:直线传感器作为图像传感器,直线传感器设有与原件的主扫描方向平行延伸的光源,如荧光灯或卤素灯。
在成像设备中使用的阅读装置中,在其潜像载体上的电位对比度(照度)和附着到潜像载体上的调色剂量之间的关系用伽玛特性曲线表示,伽玛特性曲线影响原件和它的复制件之间的密度差。在伽玛特性曲线中,照度不均匀性还要引起附着的调色剂量的不均匀性,因此对于复制的图像的清晰度有不利的影响。为了解决这个问题,日本公开的专利申请No.5-199366和No.7-319082提出了在用于阅读装置的照明装置中减小照度不均匀性的此结构。
根据上述每个专利申请公开的内容,在与光源相对的位置设置辅助反射器,用于引导从光源发出的照明光,并且在光源和原件的表面之间设置屏蔽部件,使光量均匀分配在主扫描方向。
在一般情况下,通过接收来自于照明装置的照明光来扫描要照明的原件,同时要保持原件平贴在原件放置面上。然而,由于起皱或起折而起伏不平的那些原件也要经受扫描。
一般来说,只有来自于光源的照明光照明起皱或起折的原件的情况下,由于光源的奇异性在原件的被照明的部分中有可能形成阴影。作为阴影存在的结果,获得了与实际的原件信息不同的信息作为读出信息。为了消除这一缺点,已经提出了两种结构。即,设置多个光源,或者像在上述专利申请中公开的那样,设置辅助反射器。
在这两种结构中,后者相对于前者是优选的,因为前者的缺点是在设置有光源的设备中需要光源所占据的空间,这将增加设备的尺寸。但后者也有下述新问题。
在设置辅助反射器的情况下,通过组合光源发出的直接照射原件表面的光与从辅助反射器反射回来的辅助光,可以减小照明的不均匀性。然而,来自于光源的直射光和来自于辅助反射器的辅助光在数量上是不均衡的。具体来说,辅助光量小于直射光量。因此,在扫描起皱或起折的原件的情况下,其中产生的阴影不能消除,这和直射光的强度有关。进而,在设置辅助反射器的情况下,调节反射的强度很困难,这和反射装置的调节位置有关,因此获得消除阴影所需的光量的平衡是很困难的。
发明内容
因此,本发明的总的目的是提供一种消除了上述缺点的照明装置和包括该装置的图像传感器。
本发明的一个更加具体的目的是提供一种通过适当地调节来自于光源的直射光和从辅助反射器反射的光之间光量的平衡能够消除原件中产生的阴影的照明装置。
本发明的上述目的通过一种照明装置来实现,该照明装置包括:光源,其为照明物体照明;反射部件,其设置在光源对面用于引导从光源发出的照明光的第一部分到照明物体;和遮光部件,其设置在光源和照明物体之间以及反射部件和照明物体之间,以便遮挡照明光的第一引导部分和照明光的第二部分,所述照明光的第二部分以特定比例直接照明所述照明物体,该比例即照明光的第一引导部分的遮光率与照明光的第二直射照明部分的遮光率之比,其中照明光的第二直射照明部分的遮光率大于照明光的第一引导部分的遮光率。
根据上述照明装置,以特定比例来遮挡从光源直接向照明物体发出的照明光以及从反射部件向照明物体反射的照明光,这个比例设定在直射照明光的遮光率和反射照明光的遮光率之间。因此,可以防止反射光量小于直射光量的光量不平衡。
本发明的上述目的还可以通过一种图像传感器来实现,该图像传感器包括:根据本发明的照明装置、接收从照明物体反射的光的受光部件、和向受光部件会聚从照明物体接收的光的聚焦透镜。
根据上述图像传感器,可以消除来自于光源的直射照明光和从反射部件反射的照明光之间的光量的不平衡。因此可以保证,能够防止在扫描起皱或起折的照明物体的过程中产生阴影。
附图说明
当结合附图阅读下面的详细描述时,本发明的其它目的、特征和优点将变得更加显而易见,附图中:
图1是根据本发明实施例的照明装置一部分的剖视图;
图2是说明根据本发明实施例的照明装置的反射部件的第一种变型的视图;
图3是说明根据本发明实施例的照明装置的反射部件的第二种变型的视图;
图4是说明根据本发明实施例的照明装置的反射部件的第三种变型的视图;
图5是说明根据本发明实施例的照明装置的反射部件的第四种变型的视图。
具体实施方式
下面参照附图描述本发明的实施例。
图1是根据本发明实施例的照明装置一部分的剖面图。参照图1,照明装置装入包括受光部件的图像传感器1的壳体单元内。在下面的描述中,为描述的方便起见,将壳体单元称之为图像传感器1。
图像传感器1包括:光源2、透光的透光材料(透光部件)3、反射部件4、聚焦光发送器5和受光部件6。
使用线性光源如卤素灯或荧光灯作为光源2。使用透明体如玻璃作为透光材料3。在透光材料3的上表面上可放置原件100,即照明物体。
根据图1的结构,在透光材料3的上表面上设置可转动的输送滚轮7,以便可将原件100在透光材料3上输送。
反射部件4包括可将光源2发出的光向原件100反射的反射面41。设置的反射部件4使反射面41在光源2的对面,反射面41的位置比光源2更加靠近透光材料3,即,反射面41的位置在距离D1小于距离D2的地方,其中,距离D1是反射部件4的反射面41和原件100之间的距离;距离D2是光源2的发光部分21和原件100之间的距离。所形成的反射部件4的反射面41的角度应使其能引导光源发出的照明光朝向原件100上要照明的位置。根据图1的结构,反射部件4是用注模法形成的树脂注模产品,并要经受铝汽相淀积,从而使它的反射面41的反射率在85%或以上。
根据图1的结构,反射部件4定位成其不会阻挡来自于原件100的反射光的光路,同时使反射面41位于透光材料3和聚焦光发送器5之间,从而使反射部件4的反射面41比光源2的发光部分21更加接近透光材料3,因此能够尽可能多地提高来自于反射面41的反射光的强度。根据这种结构,反射部件4的位置靠近透光材料3。因此可以减小包括反射部件4在内的整个单元的高度,因而可以减小图像传感器1的尺寸。
聚焦光发送器5是一种光学透镜,向受光部件6会聚来自于原件100的反射光。
受光部件6是设置在电路板8上的光电转换部件,电路板8固定到图像传感器1的底部。
向透光材料3上设置遮光部件9和9′。根据图1的结构,遮光部件9设在透光材料3的下表面和反射部件4之间;遮光部件9′设在透光材料3的下表面和光源2之间。
遮光部件9和9′由黑色印刷部分构成,这些黑色印刷部分的位置与透光材料3和反射部件4之间的空间以及透光材料3和光源2之间的空间分别对应。遮光部件9和9′固定在透光材料3的下表面上,成为它的部件。
遮光部件9和9′彼此相对地设置,因此可以在遮光部件9和9′之间的空间形成来自于光源2的照明光、来自于反射部件4的照明光和来自于原件100的反射光的光路。
遮光部件9和9′的相互穿过来自于原件100的反射光的光路,从而使从光源2直接发射到原件100的光和经过反射部件4发射到原件100的光在光量方面是均衡的。
换言之,确定遮光部件9′的位置,以便通过控制来自于光源2的直射照明光的光量,使得从光源2到原件100的直射照明光的光量大致等于从反射部件4到原件100的照明光的光量。结果,可以在来自于光源2的直射光的遮光率和来自于反射部件4的反射光的遮光率之间设定特定比例,其中对于来自于光源2的直射光的遮光程度要大于对于来自于反射部件4的反射光的遮光程度。
根据上述结构,对于从光源2到定位在透光材料3上的原件100的直射光以及对于从反射部件4到定位在透光材料3上的原件100的反射光,可以设定不同的遮光率。因此,通过增加来自于光源2的直射光的遮光率,可以均衡来自于光源2的直射光和来自于反射部件4的反射光的光量。结果,可以防止来自于光源2的直射光的强度大于来自于反射部件4的反射光的强度,从而可以避免出现与只使用来自于光源2的直射光的情况下出现的相同情况。
具体来说,当原件100的表面起皱或起折时,不必使用多个光源,只通过均衡光量就可获得与以上所述相同的结果。
可以要求遮光部件9和9′只具有能够获得遮光功能的结构。因此,当遮光部件9和9′与透光材料3整体形成时,遮光部件9和9′不进行上述遮光的处理或不透光的处理,而是为了散射照明光进行表面处理,以使散射光不会进入照明光的光路和从原件100反射的光的光路。
根据本发明的实施例,通过印刷将遮光部件9和9′设置到透光材料3的下表面。因此,不必形成要作为特殊的部件而附着的遮光部件9和9′,并且可通过简单的处理如着色来形成遮光部件9和9′,而在形成透光材料3时不会增加成本。
如果不是与透光材料3一起通过在透光材料3本身上进行上述印刷或表面处理来整体形成遮光部件9和9′,还可以将遮光部件9和9′形成为与透光材料3分开,然后再设置到透光材料3的部件。在这种情况下,遮光部件9和9′可以由薄膜状的薄片形成,然后再加到透光材料3上,即,在透光材料3和图像传感器1的其余部分之间的一种夹心结构。借此,可以在透光材料3中设置并加入遮光率9和9′。
由于遮光部件9和9′设置到透光材料3上,成为透光材料3的一部分,因此不需要加大遮光部件9和9′的空间。因此,可以减小图像传感器1的整个壳体单元的高度。进而,由于遮光部件9和9′包含在透光材料3内,因此有可能在制造透光材料3的过程中制造出遮光部件9和9′。因此可以简化照明装置的制造方法。进而,由于遮光部件9和9′定位在照明光直接进入的透光材料3上,所以遮光部件9和9′可以相对于原件100精确定位,从而可以相对于原件100精确确定遮光位置。
如图1所示的成对的遮光部件9和9可以由单个薄膜代替,在薄膜中形成用于光路的孔。遮光部件9和9′还可以与透光材料3一起整体形成,从而可以通过在透光材料3上进行印刷或表面处理而在其上形成孔。
反射部件4不限于注模的部件。图2-5表示出根据本发明实施例的反射部件4的各种变型。在图2-5中,用相同的附图标记代表与图1相同的部件。
图2是说明反射部件4的第一种变型的反射部件4a的视图。参照图2,通过施加反射器带10而形成反射部件4a的反射面41a,反射器带10是在基底材料上进行铝汽相淀积形成的。
图3是说明反射部件4的第二种变型的反射部件4a的视图。参照图3,反射部件4b是由片状金属部件形成的,片状金属部件的一个表面镀有反射材料。片状金属部件是弯曲的,因此能形成反射部件4b的反射面41b。
图4是说明反射部件4的第三种变型的反射部件4c的视图。参照图4,反射部件4c是由未曾镀膜的片状金属部件形成的,片状金属部件有一个弯曲部分。将如图2所示的反射器带10加到该弯曲部分,从而形成反射部件4c的反射面41c。
图5是说明反射部件4的第四种变型的反射部件4d的视图。参照图5,反射部件4d由如图2所示的反射器带10形成。反射器带10加到图像传感器1的壳体单元的一部分上,反射器带10包括弯曲表面,因此反射器带10的弯曲部分形成了反射部件4d的反射面41d。
根据图1的结构,光源2向上发射照明光。然而,根据本发明,可以根据图像传感器1的调节状态或原件100的扫描位置来确定光源2发光的方向。例如,如果原件100位于光源2的下方,就可以根据原件100的位置将光源2的发光方向调节到向下方向。通过例如上下颠倒图1的结构,就能够很容易地实现这样一种设计或结构。
本发明不限于具体公开的实施例,在不离开本发明的范围的条件下,可以进行变化和改进。
本发明基于2002年7月10日提交的日本申请No.2002-201747的优先权,该申请的全部内容在此引用作为参考。
Claims (8)
1.一种照明装置,包括:
光源,用于为照明物体照明;
反射部件,其设置在所述光源对面,以便引导从光源发出的照明光的第一部分到照明物体;和
遮光部件,其设置在所述光源和照明物体之间,以及所述反射部件和照明物体之间,以便遮挡照明光的第一引导部分和照明光的第二部分,所述照明光的第二部分以特定比例来直接照明所述照明物体,该比例即照明光的第一引导部分的遮光率与照明光的第二直射照明部分的遮光率之比,其中照明光的第二直射照明部分的遮光率大于照明光的第一引导部分的遮光率。
2.根据权利要求1所述的照明装置,其中所述反射部件的位置使得所述反射部件到照明物体之间的距离小于所述光源和照明物体之间的距离。
3.根据权利要求1所述的照明装置,其中还包括透光部件,照明物体可以放置在该透光部件上,该透光部件设置在所述反射部件和照明物体之间,其中,将所述遮光部件设置在所述透光部件上。
4.根据权利要求3所述的照明装置,其中所述遮光部件支持于所述透光部件上,并且作为所述透光部件的一部分。
5.根据权利要求4所述的照明装置,其中所述遮光部件通过印刷与所述透光部件一起整体形成。
6.根据权利要求4所述的照明装置,其中所述遮光部件通过进行表面处理与所述透光部件一起整体形成。
7.根据权利要求1所述的照明装置,其中所述反射部件的位置使得照明光的第一引导部分和照明光的第二直射照明部分的光量均衡。
8.一种图像传感器,其包括:
根据权利要求1所述的照明装置;
接收从照明物体反射的光的受光部件;和
向所述受光部件会聚从照明物体接收的光的聚焦透镜。
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JP201747/2002 | 2002-07-10 | ||
JP201747/02 | 2002-07-10 | ||
JP2002201747A JP2004048290A (ja) | 2002-07-10 | 2002-07-10 | 照明装置およびイメージセンサ |
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CN1477444A CN1477444A (zh) | 2004-02-25 |
CN1307833C true CN1307833C (zh) | 2007-03-28 |
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US (1) | US7033046B2 (zh) |
EP (1) | EP1381215B1 (zh) |
JP (1) | JP2004048290A (zh) |
CN (1) | CN1307833C (zh) |
DE (1) | DE60322151D1 (zh) |
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WO2008076159A1 (en) * | 2006-12-21 | 2008-06-26 | Cardiac Pacemakers, Inc. | Solid state pulse therapy capacitor |
JP4396715B2 (ja) | 2007-03-01 | 2010-01-13 | 三菱電機株式会社 | イメージセンサ |
JP1553848S (zh) * | 2015-06-18 | 2016-07-11 | ||
JP1553847S (zh) * | 2015-06-18 | 2016-07-11 | ||
JP1553417S (zh) * | 2015-06-18 | 2016-07-11 |
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DE60322151D1 (de) | 2008-08-28 |
EP1381215B1 (en) | 2008-07-16 |
JP2004048290A (ja) | 2004-02-12 |
US20040070978A1 (en) | 2004-04-15 |
EP1381215A1 (en) | 2004-01-14 |
US7033046B2 (en) | 2006-04-25 |
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