CN100407752C - The image reading device driving apparatus and a light source of - Google Patents

The image reading device driving apparatus and a light source of Download PDF

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CN100407752C
CN100407752C CN 200510083330 CN200510083330A CN100407752C CN 100407752 C CN100407752 C CN 100407752C CN 200510083330 CN200510083330 CN 200510083330 CN 200510083330 A CN200510083330 A CN 200510083330A CN 100407752 C CN100407752 C CN 100407752C
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surface
light source
scanning direction
light
sub
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CN 200510083330
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CN1722766A (en )
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中村哲郎
水崎正和
益本贤一
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松下电器产业株式会社
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提供一种图像读取装置的光源以及光源的驱动装置。 Driving means is provided an image and a light source is read. 在透明基板上按照透明电极·面发光体·金属电极的顺序形成膜层,以通过对上述的2个电极施加规定的电压而使之发光的图像读取装置的光源为前提。 Phosphor layers formed in the order of metal electrode-surface-transparent electrode on a transparent substrate, the light source by the image reading apparatus of the above-described predetermined voltage is applied to the two electrodes of the light emission of the premise. 并且,以在主扫描方向重复排列了在副扫描方向排列了对应R(红)·G(绿)·B(兰)各种颜色的面发光体列、或者单色的面发光体为特征。 And to repeatedly arranged in the main scanning direction are arranged corresponding to R (red) · G (green) in the sub-scanning direction · B (blue) colors of the light emitting surface of various columns, or monochromatic light emitter surface is characterized. 采用这样的做法,即使在某处一点存在膜厚较薄等缺陷时,由于集中在该阻抗值低的一点的电流仅为一点点,故不会产生从此处烧穿薄膜的问题,且谋求使主扫描方向的照度均一且长寿命化。 With this approach, the presence of even a small thickness and other defects that somewhere, since the current is concentrated in the low resistance value is only a little bit, here is not generated from burning through the film problems, and seeks to uniform illumination in the main scanning direction and a long life.

Description

图像读取装置的光源以及光源的驱动装置本申请是申请号为"02127758.3"、申请日为2002年8月8曰、 发明名称为"图像读取装置的光源以及光源的驱动装置"的申请的分案申请。 The image reading device driving apparatus and a light source of the present application is a continuation of Application No. "02127758.3", filed on August 8, 2002, saying, entitled "image reading device driving apparatus and a light source," the disclosure divisional application. 技术领域本发明涉及图像读取装置的光源。 Technical Field The present invention relates to a light source of an image reading apparatus. 背景技术复印机或扫描仪、进而兼备打印机或传真机等功能的多功能打印机都具有光学地读取在原稿纸上描绘的图像的图像读取装置。 BACKGROUND copier or scanner, and thus both functions such as a printer or a facsimile multifunction printers having an optical reading apparatus reads an image in a document image depicted on paper. 作为上述的图像读取装置,缩小光学方式(缩小CCD方式)是人们熟知的,在该缩小光学方式中,通过加大透镜的焦点深度,可以像的优点,但相反,也存在装置大型化之类S缺点。 Examples of the image reading apparatus, an optical narrow mode (narrow mode CCD) are well known, the reduction in the optical mode, by increasing the depth of focus of the lens, the advantages can be image, but instead, there is the size of the apparatus class S disadvantages. 因此,在考虑装置的小型化.薄型化时,通常如图22所示的那样,使用按等倍正立的方式将来自原稿纸的信息导入传感器108的密合方式。 Accordingly, in consideration of miniaturization of the device. When the thin, generally as shown in Figure 22, by use of magnification upright manner from the introduction information of the original manuscript adhesion sensor 108 embodiment. 即,在原稿面106的上方左右对称地并以规定的倾斜度配置2个LED阵列112,在该2个LED阵列112的中间上方位置上配置杆状透镜阵列121。 That is, at the top of the document surface 106 and symmetrically arranged at a predetermined inclination of two LED array 112, the rod lens array 121 disposed at an intermediate position above the two LED array 112 on. 根据该杆状透镜阵列121,可接受照射到上述原稿面106 的光。 According to this rod lens array 121, the light irradiated to the document acceptable surface 106. 这里,上述LED阵列112如图23所示的那样,在基板124是排列多个LED元件125而成。 Here, the LED array 112 as shown in Figure 23, the substrate 124 is formed by arranging a plurality of LED elements 125. 此外,上述的杆状透镜阵列121如图24 所示的那样,使规定数目的圆柱形状的杆状透镜122邻接排列,形成用基板124来夹住的构成。 Further, the rod lens array 121 as shown in Figure 24, so that a predetermined number of rod lenses 122 arranged adjacent cylindrical shape, formed by the substrate 124 sandwiched configuration. 如果使用这样的密合方式,则由于可以减小原稿面106和杆状透镜122的距离而可以将装置整体做得相当的小。 If such a close contact manner, since the distance from the document surface 106 and the rod lens 122 can be reduced and the entire apparatus can be made relatively small. 由此可见,要进行装置的小型化,将光源尽可能地近接配置在原稿面也是很重要的。 Thus, the device to be miniaturized, the light source disposed in proximity as much as possible the document surface is also important. 但是,由于上迷现有的LED阵列112是点光源的集合,如果不保持该光源与原稿面的某种程度的距离将不能确保照度的均一性。 However, since the above-conventional LED array 112 is a collection of point light source, if the distance is not maintained some degree of the light source and the surface of the document will not ensure the uniformity of illuminance. 即,要使用上述现有的LED阵列进行装置的小型化是有限度的。 That is, to downsize the device is limited to the above-described conventional LED array. 因而,本发明申请人在特许2000-217561号专利等中提出将以下要说明的电致发光膜作为面发光光源使用。 Accordingly, the applicant of the present invention provides an electroluminescent film will be described in the following No. 2000-217561 Patent Laid the like as surface-emitting light source. 即,如图25所示的那样,在主扫描方向,在长的玻璃或者透明树脂等的透明基板101上形成透明电极膜103,在其上面形成作为光媒体的电致发光膜100,进而,在其上面积层金属电极102。 That is, as shown in Figure 25, in the main scanning direction, the transparent electrode film 103 is formed on a transparent substrate 101 of glass or a transparent resin long such as electro-optic medium luminescent film 100 is formed thereon, and further, a metal layer on the area in which the electrode 102. 另外,在以彩色方式来实现这样的面发光光源时,在需要使主扫描方向的照度均一的基础上,如图26所示的那样,要在副扫描方向形成对应R (红)'G (绿)'B (兰)各种颜色的等宽的电致发光膜100rl00gl00b。 Further, when the color mode is achieved in such a surface light source in the main scanning direction is required based on the uniform illuminance, as shown in FIG, to form the corresponding R (red) 'G (in the sub-scanning direction 26 the electrical width green) 'B (blue) colors of the luminescent film 100rl00gl00b. 如图27所示的那样,相互保持规定间隔在原稿9的上方左右对称地配置2个面发光光源5。 As shown in FIG. 27, mutually spaced a predetermined distance around two surfaces arranged symmetrically above the light source 5 of the document 9. 由此,可以使照射到原稿9的光经由配置在2个面发光光源5的中间上方位置的透镜14而导向传感器1。 Thereby, light can be irradiated onto the document disposed on the two faces via the light source above the intermediate position of the lens 5 and the guide 149 of the sensor 1. 这样,即使使面发光光源5接近读取位置Pa,在该读取位置Pa 也可以得到均一的照度。 Thus, even if the surface-emitting light source 5 close to the reading position Pa, the reading position Pa uniform illuminance can be obtained. 即,代替上述现有的LED阵列采用本发明申请人所提出的面发光光源可以进行装置的小型化。 That is, instead of the conventional LED array using the surface light source proposed by the applicant of the present invention may be miniaturized device. 但是,在采用了上述电致发光膜100r.100g.100b面发光光源上, 存在寿命短的问题。 However, using the above-mentioned problems in the electroluminescent film 100r.100g.100b surface-emitting light source, there is a short life. 即,如图26所示的那样,如果在某处的一点X 位置存在膜厚较薄等缺陷,则在该阻抗值低的一点X处将汇集电流, 并由此位置烧穿电致发光膜100b。 That is, as shown in Figure 26, if there is little defect like a thin film thickness X position somewhere, then at the point X at a low impedance value current collecting, and thus the position of the burn-through film electroluminescent 100b. 发明内容本发明是基于上述现有的情况而提出的发明,目的在于使在主扫描方向的照度均一的同时谋求图像读取装置的光源的长寿命化。 The present invention is an invention based on the above conventional circumstances, and an object is to make the life of the light source of the image reading apparatus of the seek while a uniform illuminance in the main scanning direction. 本发明为达成上述目的采用了以下的方法。 To achieve the object of the present invention employs the following methods. 即,本发明是一种图像读取装置的光源,它按照透明电极、面发光体、金属电极的顺序在透明基板上形成膜层,并通过对上述的2个电极施加规定的电压而发光,其特征在于:所述光源具有多个面发光体,其中所述面发光体对应红、绿、蓝这三种颜色中的一种颜色,所述面发光体被形成为非矩形的平行四边形并在主扫描方向上对所述面发光体进行重复排列。 That is, the present invention is a light source of an image reading apparatus, according to which a transparent electrode, a surface light emitter, the order of the metal electrode layer formed on the transparent substrate, and a predetermined voltage is applied to the above-described two electrodes and a light emitting, wherein: said light source having a plurality of surface light emitter, wherein said emitter surface corresponding to red, green color, and blue three colors, the emitter surface is formed, and a non-rectangular parallelogram the surface-emitting body repeatedly arranged in the main scanning direction. 这样,如果采用将发光区域分割成多个面发光体的构成,则即使在某处一点位置存在膜厚较薄等缺陷时,由于集中在该阻抗值低的一点的电流仅为一点点,故不会产生从此处烧穿薄膜的情况。 In this way, if the light emitting region is divided into a plurality of surface light emitters configuration, even when the film is thin like defects in the position of a point somewhere, since the current is concentrated in the low resistance value is only a little bit, so from here the case of no burn-through film. 附图说明图l所示是适用于本发明的彩色面发光光源的构成;图2所示是实验中使用的面发光光源的构成;图3是寿命和开口率的关系图;图4是使用了电致发光膜的彩色面发光光源的说明困;图5是适用于本发明的彩色面发光光源的构成图;图6是相位Zl、相位Z2以及相位Z3的说明图;图7所示是相位Zl、相位Z2以及相位Z3的副扫描方向的照度分布;图8是相位Z4以及相位Z5的说明图;图9所示是相位Z4以及相位Z5的副扫描方向的照度分布;图IO是照度分散的说明图; 图ll所示是适用于本发明的彩色面发光光源的构成; 困12所示是相邻的同种颜色的面发光体同类在副扫描方向重叠的形态;图13所示是相邻的同种颜色的面发光体同类在副扫描方向重叠的形态;图14是用于说明抛物线状的照度分布的图; 图15是用于说明梯形形状的照度分布的图;图16是用于说明上边长度的 BRIEF DESCRIPTION OF DRAWINGS Figure l is a configuration suitable for use in the present invention, light source color planes shown; FIG. 2 is a surface light source used in the experiment shown; FIG. 3 is a graph of the life and the opening ratio; FIG. 4 is used described surface light source color electroluminescent film trapped; FIG. 5 is a block diagram of the present invention is applicable to the color of the surface of the light source; FIG. 6 is a phase Zl, Z2, and explaining the phase of the phase Z3; 7 is shown in FIG. phase Zl, Z2 phase and a phase of the sub-scanning direction Z3 illuminance distribution; FIG. 8 is an explanatory view of a phase of Z4 and Z5 phase; FIG. 9 is a phase of illumination sub-scanning direction Z4 Z5 and phase distribution; FIG illuminance IO FIG explanatory dispersion; ll shown in FIG configuration is useful in the present invention, the surface color of the light source; FIG. 12 is trapped adjacent surface light emitters of the same color in the same sub-scanning direction, overlapping patterns; FIG. 13 adjacent surface light emitters of the same color in the same sub-scanning direction, overlapping patterns; FIG. 14 is a diagram showing a parabolic distribution of the illuminance for explaining; FIG. 15 is a diagram illustrating an illuminance distribution of a trapezoidal shape; FIG. 16 It is a view for explaining the length of the upper 图;图17是用于说明利用2个面发光光源所得到的照度分布的图;图18是面发光光源的配置说明图;图19是原稿纸面照度和MTF值的测量结果;图20所示是驱动发光元件的构成;图21所示是驱动发光元件的构成;图22是现有的图像读取装置的构成图;图23是现有的图像读取装置所具备的光源的斜视图;图24是现有的图像读取装置所具备的杆状透镜阵列的斜视图;图25是使用了电致发光膜的黑白面发光光源的斜视图;图26是使用了电致发光膜的彩色面发光光源的说明图;图27是采用了面发光光源的图像读取装置的构成图。 FIG.; FIG. 17 is a view for explaining the use of two surface-emission light source of FIG illuminance distribution obtained; FIG. 18 is a configuration explanatory view of the surface light source; FIG. 19 is a measurement result of the paper document illuminance and MTF values; FIG. 20 driving the light emitting element is shown configuration; FIG. 21 is a configuration driving a light emitting element; FIG. 22 is a configuration diagram of a conventional image reading apparatus; FIG. 23 is a perspective view of a conventional image reading apparatus includes a light source ; FIG. 24 is a perspective view of a conventional rod lens array included in the image reading apparatus; FIG. 25 is a black and white using the surface light source of FIG perspective electroluminescent film; FIG. 26 is the use of electroluminescent film DESCRIPTION oF FIG color of the surface light source; FIG. 27 is a configuration diagram of an image using the reading device of a surface light source. 具体实施方式以下根据附图详细说明本发明的实施形态。 DETAILED DESCRIPTION The following detailed description of the embodiments of the present invention based on the drawings. 这里,在以下的说明中,有时有将构成l个发光区域的面发光体称为"发光元件,,的情况。(实施形态1)本发明与上述现有技术同样,按照透明电极*面发光体*金属电极的顺序在透明基板上形成膜层,以通过对上述的2个电极施加规定的电压而使之发光的图像读取装置的光源为前提。这里,如图27所示的那样,是以具备2个光源5为前提进行说明,但本发明并非仅限定于此。 即,不仅仅是具备2个光源的构成,只具备其中一方的光源的构成也是本发明的适用范围。下面只说明本发明的构成与上述现有技术不同点。首先,在本发明中,如图l所示的那样,在主扫描方向重复排列了在副扫描方向排列了对应R (红).G (绿).B (兰)各种颜色的等宽-等长度的面发光体5r.5g.5b面发光体列G。这样,如果按照较细地分割面发光体的发光区域的构成,则即l更是在某处一点存在 Here, in the following description, sometimes the material composition of the surface emitting light-emitting region are also called l "in the light emitting element ,,. (Embodiment 1) of the present invention, the above-described prior art Similarly, a transparent electrode according to the surface emitting * * sequence thereof is formed a metal electrode film on the transparent substrate, the light source by the image reading apparatus of the above-described predetermined voltage is applied to the two electrodes of the light emission is premised. here, as shown in FIG. 27, 5 includes two light sources based on the premise will be described, but the present invention is not limited only to this. That is, not only the configuration provided with two light sources, the scope includes only one of which also constituting the light source of the present invention. the following only will be described. first, in the present invention, the present invention is constructed as described above is different from the prior art is shown in Figure l, it is repeatedly arranged in the main scanning direction corresponding to the arrangement of the R (red) in the sub-scanning direction .G (green ) .B width (blue) of various colors - light emission surface of the surface emitting length thereof 5r.5g.5b columns G. Thus, if the configuration according to finely divided light emitting region of the surface of the emitter, i.e., the l there is somewhere a little more 膜厚较薄等缺陷的情况,集中在该阻抗值低的一点处的电流也仅为一点点。因而,不会产生从此处烧穿薄膜的情况,作为结果将可以*〖某求图像读取装置的光源的长寿命化。这里,示于该图的导线Rr.Rg.Rb分别与面发光体5r.5g.5b用的透明电极相连接,此外,导线Rc与金属电极(公共电极)相连接。但是,在发光元件之间,其形成处理上需要设置某一定的间隔。 因而,如果过细地分割面发光体的发光区域,则光源的全部区域中发光区域所占的比例(以下称为"开口率")将降低。因此,在本发明中,在确定发光元件的最佳面积的基础上,如图2所示的那样,对宽度为2.5mm并改变了长度Ld的种种发光元件测量了其寿命。其结果如图3所示的那样,可知随着发光元件的面积的变宽,寿命呈抛物线状地变短,此外,开口率则直线状地升高.一般认为发光元件的长度做 Defects such as when the film thickness is thin, the current focus in the low resistance value at a point of only a little. Therefore, the situation where no burn-through of the film, as a result of the requested image can be read 〖* long life of the light source device. here, in the figure shown respectively Rr.Rg.Rb wire body surface of the transparent electrode is connected to the light emitting 5r.5g.5b used, in addition, Rc wire metal electrode (common electrode) with connection, however, between the light emitting element, the entire region need to set the proportion of a certain interval on the process. thus, if too finely divided light emitting region of the surface light emitter, the light emission region occupied by the formed (hereinafter referred to as "opening ratio") is reduced. Accordingly, in the present invention, the area is determined based on the best of the light emitting element, as shown in FIG. 2, a width of 2.5mm and various changes measured length Ld of the light emitting element its lifetime. as a result, as shown in Figure 3, seen with the wider area of ​​the light emitting element, the life becomes shorter parabolic, in addition, an aperture ratio is increased linearly generally considered the length of the light emitting element do 3mm程度为最好。即可知,如果将发光元件的面积做成7.5mm2 (2.5mmx3mm)的程度,则可以在得到80%的开口率的同时,获得8000hr以上的寿命。如以上这样,如果使面发光体的面积对应根据光源的寿命与开口率的相关关系所确定的面积,则可以在获得满足的开口率的同时谋求图像读取装置的光源的长寿命化。这里,虽然在将发光元件的面积做成了7.5mm2程度时得到了认为是最好的结果,但该面积并非是特别限定的面积。即,光源的寿命与开口率的相关关系依存于发光元件的膜厚、膜生成的处理条件、装置的清洁度等诸条件。因而,即便是被认为是最好的发光元件的面积也会随这些诸条件的变化而变化。此外,这里所例示的是黑白面发光光源,但本发明并非仅限定于该黑白光源。 For the best degree of 3mm. To know, if the degree of 7.5mm2 (2.5mmx3mm) area of ​​the light emitting element is made, it is possible to obtain an aperture ratio of 80%, while more than 8000hr lifetime is obtained. As described above, when the corresponding area of ​​the surface light emitter according to the determined correlation between the life ratio of the opening area of ​​the light source, the light source can be prolonged life of the image reading device while the aperture ratio satisfied. here, although the light emitting element when the area has been made of the degree of 7.5mm2 considered the best results, but the area is not particularly limited area. that is, the correlation between the life of the light source and the aperture ratio of the light emitting element depends on the film thickness, the film-forming treatment conditions, various conditions cleanness apparatus. thus, even if the area is considered to be the best of the light emitting element also changes with these various conditions change. Further, illustrated herein is a black and white surface light source, but the present invention is not limited only to the black and white light. 即,在使面发光体的面积对应根据光源的寿命与开口率的相关关系所确定的面积的点上,彩色面发光光源也是一样的。 I.e., that the area on the surface of the emitter corresponding to the determined correlation between the service life in accordance with the opening ratio of the area of ​​the point light source, the color of the surface light source is the same. (实施形态2)如上述这样,在实施形态l中,在主扫描方向重复排列了在副扫描方向排列了对应RGB各种颜色的等宽.等长度的面发光体5r. 5g. 5b 的面发光体列G。 Surface 5r. 5g. 5b surface length (Embodiment 2) As described above, in the embodiment l, repeatedly arranged in the main scanning direction corresponding to the arrangement of the sub-scanning direction in a wide variety of colors such as RGB et illuminant the light emitting element row G. 采用这样的做法,则可以在获得满足的开口率的同时谋求图像读取装置的光源的长寿命化。 With this approach, it is possible to lengthen the life of the light source of the image reading device while the aperture ratio being met. 但是,利用这样的面发光光源,主扫描方向的照度分布虽然达到了均一,但副扫描方向的照度分布却不能达到均一。 However, with such a surface light source, the illuminance distribution in the main scanning direction although they achieve homogeneity, but the illuminance distribution sub-scanning direction can not achieve uniform. 即,在副扫描方向,由于对应RGB各种颜色的面发光体5r5g.5b为按规定间隔重现, 故副扫描方向的RGB各种颜色的照度分布呈以该间隔为1个周期的波形。 That is, in the sub-scanning direction, since the RGB colors corresponding to the surface emitting body at predetermined intervals 5r5g.5b is reproduced, so that various colors of RGB sub-scanning direction to form the illuminance distribution interval of a waveform cycle. 为了解决上述的课题,如图4所示的那样,可以在主扫描方向重复排列对应RGB各种颜色的等宽的面发光体100r'100g*100b。 To solve the above problem, as shown in FIG 4, may be repeatedly arranged like a wide surface corresponding to each color RGB light emitters 100r'100g * 100b in the main scanning direction. 采用这样的做法,在副扫描方向因为对应RGB各种颜色的面发光体100r.100g.100b必然呈现一个,故可以使副扫描方向的RGB各种颜色的照度分布达到均一。 With this approach, because the sub-scanning direction corresponding to the RGB color plane illuminance distribution of the luminous body presents a 100r.100g.100b necessarily, it is possible to make the sub-scanning direction reaches a uniform RGB colors. 但如果采用这样的面发光光源,副扫描方向的照度分布虽然达到了均一,但主扫描方向的照度分布却不能达到均一。 However, if such a surface-emitting light source, the illuminance distribution in the sub scanning direction, although they achieve homogeneity, but the illuminance distribution in the main scanning direction can not achieve uniform. 即,在主扫描方向,由于对应RGB各种颜色的面发光体100r'100g'100b按规定间隔重现,故主扫描方向的RGB各种颜色的照度分布呈以该间隔为1个周期的波形。 That is, in the main scanning direction, since the surface of the emitter corresponding to each color RGB 100r'100g'100b reproducing predetermined intervals, so that the RGB colors in the main scanning direction, the illuminance distribution in the form of a cycle interval of a waveform . 下面只说明本实施形态与上述实施形态1的不同点。 The following only different points of the present embodiment 1 of the above embodiment. 首先,在本实施形态中,如图5(a)所示的那样,在副扫描方向排列了多个面发光体行Gl,以便使相互的主扫描方向的相位只有面发光体一种颜色程度的不同。 First, in the present embodiment, the degree of only one color emitter surface in FIG. (A), as shown, a plurality of surface light emitters are arranged in a row Gl sub-scanning direction so that each phase of the main scanning direction 5 s difference. 该所谓的面发光体行Gl指的是在主扫描方向重复排列了对应RGB各种颜色的等宽*等长度的面发光体5r-5g'5b的一行。 This so-called surface light emitter line Gl refers to the main scanning direction are repeatedly arranged in a line width corresponding faces of equal length * RGB colors and the like of the light emitter 5r-5g'5b. 釆用这样的做法,由于在主扫描方向的哪一个相位都一定会出现对应RGB各种颜色的面发光体5r.5g.5b,故可以使主扫描方向的RGB 各种颜色的照度分布均一。 Preclude the use of various colors RGB this approach, since all will appear which corresponds to a phase of the main scanning direction of each color of RGB surface emitter 5r.5g.5b, it is possible to make the main scanning direction, uniform illuminance distribution. 此外由于在副扫描方向的哪一个相位都一定会出现对应RGB各种颜色的面发光体5r'5g'5b,故也可以使副扫描方向的RGB各种颜色的照度分布均一。 Furthermore, since the RGB colors will necessarily occur corresponding to a phase in which the sub-scanning direction of each color of RGB surface emitter 5r'5g'5b, it may be that the sub-scanning direction uniform illuminance distribution. 或者,也可以如图5 (b)所示的那样,在副扫描方向排列多个面发光体行G1,以使相互的主扫描方向的相位只有面发光体半种颜色程度的不同。 Alternatively, FIG. 5 (b) as shown, a plurality of surface light emitters are arranged in the sub-scanning direction line G1, so that the phase of each of the main scanning direction and only the different levels of the surface emission color half seed. 不过,如果采用这样的构成,与采用了图5 (a)所示的光源的构成相比,在使RGB各种颜色的主扫描方向的照度分布均一的面上,效果多少有些变小,但却有副扫描方向的照度峰值位置出现在读取位置近旁这样的优点。 However, if such a configuration, the surface configuration using FIG 5 (a) as compared to a light source shown in the main scanning direction of each color of RGB illuminance distribution uniform, the effect of somewhat smaller, but there illuminance peak position in the sub-scanning direction occurs near the reading position advantage. 即,在采用了图5 (a)所示的面发光光源5时,副扫描方向的照度峰值位置不出现在读取位置近旁。 That is, when the light source 5 in the plane shown in Figure 5 using (A), the peak position of the illumination sub-scanning direction do not appear in the vicinity of the reading position. 为了更为详细地说明这一点,如图6所示的那样,给出了关于相互不同的主扫描方向的相位(相位Zl、 相位Z2以及相位Z3),其副扫描方向的照度分布示于图7。 To illustrate this in more detail, as shown in FIG 6 is given a different phase from each other on the main scanning direction (Zl phase, phase and phase Z2 Z3), which sub-scanning direction illumination distribution is shown in FIG. 7. 首先,由于在相位Z1的副扫描方向存在面发光体5rl,故可以得到由该面发光体5rl发出的光所产生的照度分布Yl。 First, due to the presence of a surface light emitter 5rl phase Z1 in the sub-scanning direction, it is possible to obtain the light emitted from the surface light emitter 5rl illuminance distribution generated by Yl. 该照度分布Yl 的照度峰值位置(即,相位Zl的副扫描方向的照度峰值位置)在该图面上出现在读取位置Pa的左方。 The illuminance distribution of illumination Yl peak position (i.e., peak position illuminance sub-scanning direction Zl of phase) occurs in this figure the left surface of the reading position Pa. 此外,由于在相位Z2的副扫描方向存在面发光体5r2,故可以得到由该面发光体5r2发出的光所产生的照度分布Y2。 Further, since the surface emitter 5R2, it is possible to obtain light emission by the illumination of the surface material of the generated emitted 5R2 Y2 distributed phase is present in the sub scanning direction Z2. 该照度分布Y2 的照度峰值位置(即,相位Z2的副扫描方向的照度峰值位置)在该图面上一致于读取位置Pa。 The illuminance distribution Y2 illuminance peak position (i.e., the phase of the sub-scanning direction Z2 illuminance peak position) in the same reading position Pa in the surface. 进而,由于在相位Z3的副扫描方向存在面发光体5r3,故可以得到由该面发光体5r3发出的光所产生的照度分布Y3。 Further, due to the presence of a surface light emitter 5r3 phase Z3 in the sub-scanning direction, it is possible to obtain the illumination light emitted from the surface light emitter 5r3 distribution produced Y3. 该照度分布Y3 的照度峰值位置(即,相位Z3的副扫描方向的照度峰值位置)在该图面上出现在读取位置Pa的右方。 The illuminance distribution Y3 illuminance peak position (i.e., the phase of the sub-scanning direction Z3 illuminance peak position) appear at the right of FIG surface Pa of the reading position. 与此相对应,在采用了图5 (b)所示的面发光光源5时,副扫描方向的照度峰值位置将出现在读取位置近旁。 Correspondingly, the use of the FIG. 5 (b) when the surface light source 5, the peak position of the illumination sub-scanning direction appears in the vicinity of the reading position shown. 为了更为详细地说明这一点,如图8所示的那样,给出了关于相互不同的主扫描方向的相位(相位Z4以及相位Z5),其副扫描方向的照度分布示于图9。 To illustrate this in more detail, as shown in Figure 8, it is given a different phase from each other on the main scanning direction (phase and phase Z4 Z5), which sub-scanning direction illumination distribution is shown in Fig. 首先,由于在相位Z4的副扫描方向存在面发光体5rl以及5r2,以及Y2。 First, due to the presence of a surface light emitter 5rl Z4 in the sub scanning direction and the phase 5R2, and Y2. 该照度分布Yl的照度峰值位置在该图面上出现在读取位置Pa的左方,而该照度分布Y2的照度峰值位置在该图面上则一致于读取位置Pa。 The peak position of the illuminance of the illuminance distribution Yl FIG appear on the left surface of the reading position Pa, and the illuminance distribution of the illuminance on the peak position Y2 FIG surface conforms to the reading position Pa. 因而,合成了该照度分布Yl和Y2的照度分布的照度峰值位置(即,相位Z4的副扫描方向的照度峰值位置)较读取位置Pa出现在稍靠左方。 Thus, the illuminance distribution synthesized luminance peak position Yl and Y2 of the illuminance distribution (i.e., the phase of the sub-scanning direction Z4 illuminance peak position) than in the reading position Pa appeared slightly to the left side. 此外,由于在相位Z5的副扫描方向存在面发光体5r2以及5r3,以k Y3。 Further, since the presence of a surface light emitter 5r2 and 5r3 phase Z5 in the sub scanning direction to k Y3. 该照度分布Y3的照度峰值位置在该图面上出现i读取位置Pa的右方,而该照度分布Y2的照度峰值位置在该图面上则一致于读取位置Pa。 I right reading position Pa of the illuminance distribution of the illuminance peak position Y3 appear in the surface, and the illuminance distribution of the illuminance on the peak position Y2 FIG surface conforms to the reading position Pa. 因而,合成了该照度分布Y2和Y3的照度分布的照度峰值位置(即,相位Z5的副扫描方向的照度峰值位置)较读取位置Pa出现在稍靠右方。 Thus, the synthesized peak position of the illuminance of the illuminance distribution Y2 and Y3 illuminance distribution (i.e., the phase of the sub-scanning direction Z5 illuminance peak position) than in the reading position Pa appear slightly right side. 在采用了图5(b)所示的面发光光源5时,副扫描方向的照度峰值位置出现在读取位置近旁的现象,不仅是上述主扫描方向的相位Z4 以及Z5,在其他的主扫描方向的各相位处也同样地出现。 When using FIG. 5 (b) the surface-emitting light source 5, the peak position of the illumination sub-scanning direction occurs in the vicinity of the reading position phenomenon, not only is the phase Z4 and Z5 of the main scanning direction, in another main scanning direction at each phase also occur. 因而,在采用了图5 (b)所示的面发光光源5时,如图10(b) 所示的那样,在原稿纸没有飘起时的照度分散61和原稿紙飘起时的照度分散62,其特性几乎没有变化。 Thus, using FIG. 5 (b), when the surface light source 5, FIG. 10 (b) as shown, when dispersed illuminance when the illuminance of the original manuscript without dispersion float 61 and float original sheet 62, the characteristics hardly changed. 与之相反,在采用了图5 (a)所示的面发光光源5时,如图10 (a)所示的那样,在原稿纸没有飘起时的照度分散61和原稿纸飘起时的照度分散62,其特性完全不同。 In contrast, when using the FIG. 5 (a), a surface light source 5, FIG. 10 (a) as shown, when the illuminance of the original sheet do not float when the dispersion of the float 61 and the original sheet illuminance dispersion 62, which is completely different properties. 另外,称用于在主扫描方向使传感器1输出的图像的照度分散为恒定的校正为"发散校正"。 Further, for the illumination in said main scanning direction of the output image sensor 1 is corrected to a constant dispersion "the divergence correction." 即,最初读取白紙并特定主扫描方向的照度分散,以后,如果考虑该照度分散并发散校正图像,则可以得到没有照度分散的图像。 That is, the illumination initially read and white specific dispersion main scanning direction, after consideration of the dispersion and divergence corrected image illuminance, luminance dispersion can be obtained without an image. 如上述这样,在采用了图5 (b)所示的面发光光源5时,原稿纸飘起时和原稿纸没有飘起时的照度分散的特性几乎没有变化。 As described above, when employed in FIG. 5 (b) the surface light source shown in FIG. 5, when the luminance dispersion original sheet when no original sheet to float and float almost no change in properties. 因而, 此时由于最初特定的照度分散原样不变地有效,故可以进行发散校正。 Thus, this time due to the initial illuminance specific effective dispersion without change, it can be corrected divergence. 因此,在作为图像读取方式采用平台座方式(后述)时,采用图5(b) 所示的面发光光源5较为合适,这样可以有效地进行发散校正。 Thus, when using the seat platform embodiment (described later) as an image reading method, using FIG. 5 (b) the surface light source shown in FIG. 5 is more appropriate, which can effectively corrected divergent. 与之相反,在采用了图5 U)所示的面发光光源5时,原稿紙飘起时和原稿紙没有飘起时的照度分散的特性完全不同。 In contrast, in the U-using FIG. 5) when the surface light source shown in FIG 5, when the luminance dispersion original sheet when the sheet document is not to float and float completely different properties. 因而,由于此时最初特定的照度分散已经无效,故不能进行发散校正。 Thus, since at this time the initial dispersion has a specific illuminance invalid, it can not be corrected divergence. 因此,在作为图像读取方式采用平面进给方式(后述)时,采用图5 (a)所示的面发光光源5较为合适,这样可以使主扫描方向的照度分布均一。 Thus, as employed in the image reading mode planar feed mode (described later), using surface shown in FIG. 5 (a) is more appropriate light source 5, which can make the illuminance distribution in the main scanning direction is uniform. 这样,根据图像读取方式,最好选择地采用图5 (a)所示的面发光光源5和图5 (b)所示的面发光光源5的某一个。 Thus, according to the image reading mode, it is preferable to selectively use the face shown in FIG. 5 (a) light source 5 and FIG. 5 (b) one of the surface light source 5 shown in FIG. 不过,在采用平面进给方式的同时也可以采用图5 (b)所示的面发光光源5,在采用平台座方式的同时采用图5 (a)所示的面发光光源5也没有关系。 However, while the planar feed mode may be employed in FIG. 5 the surface light source shown in FIG. 5 (B), using the plane shown in FIG. 5 (a) while using the seat platform 5 of a light emitting source it does not matter. 这里,上述所谓的平面进给方式,指的是通过滚筒使原稿纸移动到成像传感头侧来读取描绘在其原稿纸上的图像的方式。 Here, the so-called flat feed mode, means that the original sheet is moved by the drum to the head side of the imaging sensor to read the document image depicted on paper in its way. 在采用该方式时,不需要考虑原稿纸的飘起与否。 When using this embodiment, the original sheet no need to consider whether or not to float. 另一方,上述所谓的平台座方式,指的是将原稿纸固定在玻璃台上,通过在其下移动成像传感头来读取描绘在其原稿纸上的图像的方式。 The other of said seat mode called platform, means that the original manuscript glass fixed on the stage, the image in its embodiment by reading the paper document in which the movement of the imaging sensor head depicted. 采用该方法,具有可使用书本或杂志这样的有厚度的原稿纸的优点,但必须考虑原稿纸的飘起。 With this method, has the advantage of the original sheet thickness may be used such as a book or magazine, it must be considered the original sheet float. (实施形态3)下面只说明本实施形态与上述实施形态2的不同点。 (Embodiment 3) Next, only the different points of the present embodiment aspect 2 of the above embodiment. 即,在本实施形态中,如图ll所示的那样,形成平行四边形并在主扫描方向重复排列了对应RGB各种颜色的等宽*等长度的面发光体5r.5g5b。 That is, in the present embodiment, as shown in FIG ll, and a parallelogram is formed in the main scanning direction are repeatedly arranged like a face width * length and the like corresponding to each color RGB light emitter 5r.5g5b. 即使是利用这样的构成,如图12所示的那样,可知如果相邻的同色的面发光体(在此为红色的面发光体5r)在副扫描方向重叠放置, 则也可以实现照度分散在10%以内。 As shown in FIG. 12 Even with such a configuration, as shown, can be seen if the same color adjacent to a surface light emitter (here, the red light emitter surface 5R) placed one in the sub-scanning direction, the illumination can also be implemented in dispersed 10% or less. 特别地,如图13所示的那样,在某个面发光体的左上顶点Ao较与该面发光体相邻的同种颜色的面发光体的右下顶点d位于右侧时,可知可以实现照度分散在5 %以内。 In particular, as shown in FIG. 13, lower right vertex d of the plane light emitter at the upper left vertex Ao of the light emitter on a face adjacent to the surface than the light emitter when the same color on the right side, seen can be achieved illuminance dispersion within 5%. 如以上这样,通过采用形成平行四边形并在主扫描方向重复排列对应RGB各种颜色的等宽.等长度的面发光体Sr.5g.5b的构成,可以得到与上述实施形态2大致相同的效果。 As described above, by using a parallelogram formed and arranged repeatedly RGB colors corresponding to the width in the main scanning direction. Sr.5g.5b other luminous body constituting the surface length, the above-described embodiment can be obtained substantially the same effects 2 . (实施形态4)但是,要实现目的焦点深度D,则需要即使原稿纸飘起也能够得到清晰的图像。 (Embodiment 4) However, to achieve the object of the focal depth D, the original sheet even if the need to float it is possible to obtain a clear image. 并且,要即使原稿紙飘起也能够得到清晰的图像,则需要如以下将说明的这样,使副扫描方向的照度分布成为梯形形状。 Further, even if the original sheet to float it is possible to obtain a clear image, it is necessary as will be explained in this manner, the illuminance distribution in the sub-scanning direction becomes a trapezoidal shape. 即,如图14给出的在原稿纸飘起时(图面上、下方向为原稿纸飘起的方向)得到的抛物线状的照度分布Y一2,在原稿纸没有飘起时(即原稿纸贴在玻璃台上的情况)得到的抛物线状的照度分布Y一l。 That is, 14 (FIG surface direction, the direction of the original sheet of float) given in FIG float when the original sheet obtained parabolic illuminance distribution of a Y 2, do not float in the original sheet (i.e., the original in the case of paper attached to the glass table) obtained parabolic distribution of the illuminance Y-l. 如该图所示的那样,在副扫描方向的照度分布成为了抛物线状时,如果原稿纸飘起,则因读取位置Pa的照度变低而不能得到清晰的图像。 When as shown in the figure, the illuminance distribution in the sub-scanning direction becomes parabolic, if the original sheet to float, due to the reading position becomes low illuminance Pa can not obtain a clear image. 这里,为了便于说明,是对利用一个面发光光源5所得到的照度分布进行的说明,但可以说关于利用2个面发光光源5所得到的照度分布也是一样的。 Here, for convenience of explanation, is the use of a surface-emitting light source illuminance distribution obtained five instructions, but it can be said on the use of two surface-emission illuminance distribution of the light source 5 is the same obtained. 即,在具备有2个面发光光源5的构成中,如图17 所示的那样,仅仅是合成利用各自的面发光光源5所得到的照度分布。 Specifically, there are provided two light sources emitting surface 5, as shown in FIG. 17, only using the respective synthetic surface-emitting light source 5 illuminance distribution obtained. 与此相对应,图15所示是在原稿纸飘起时得到的梯形形状的照度分布Q一2,在原稿纸没有飘起时(即,原稿纸贴在玻璃台上的情况) 得到的梯形形状的照度分布Q一l。 Correspondingly, FIG. 15 is obtained when the original sheet to float illuminance distribution Q a trapezoidal shape 2, when no original sheet to float (i.e., original sheet attached to the glass case of the stage) to give the trapezoidal a shape of the illuminance distribution Q l. 如该图所示的那样,在副扫描方向的照度分布成为了梯形形状时,即使原稿纸飘起,但因读取位置Pa 的照度没有变低,故也能够得到清晰的图像。 As shown in this figure, the illuminance distribution in the sub-scanning direction becomes a trapezoidal shape, even if the original sheet to float, but not the reading position Pa illuminance becomes low, it is also possible to obtain a clear image. 要将副扫描方向的照度分布做成梯形形状,简单的办法是扩大副扫描方向的发光元件的宽度。 To illuminance distribution in the sub-scanning direction is made a trapezoidal shape, the simplest way is to expand the sub-scanning direction of the light emitting element width. 但是,如果扩大发光元件的宽度,则不但成本上升,还将招致装置的大型化。 However, if the expansion of the light emitting element width, not only the cost increases, the size of the apparatus will be incurred. 因而,在本实施形态中,我们采用了以下的手法。 Thus, in this embodiment, we used the following approach. 图16所示是在原稿纸飘起时得到的梯形形状的照度分布Q一2和在原稿纸没有飘起时得到的梯形形状的照度分布Q—1。 As shown in FIG. 16 is obtained when the original sheet to float trapezoidal illuminance distribution of illumination Q 2 and a trapezoidal shape obtained when no original sheet to float distribution Q-1. 这里,副扫描方向的梯形形状的照度分布的上边长度w为利用下式所求得的值以上。 Here, the length of the upper trapezoidal w illuminance distribution sub-scanning direction using the above values ​​is determined by the following formula. 这里,该式所给出的所谓"『是指连结面发光光源5的中心O和读取位置Pa的线段与原稿面所成的角度。 【式1】 W - 2D/tan6>如果注意困16中用粗线给出的直角三角形F,则可以容易地导出该式。即,因为该直角三角形F的底边的长度为W/2,高度为D,故tan" = D/ ( W/2 ),即求得式1。 Here, "" This formula is given a surface-emitting light source means connecting the center O and the reading position of the line segment Pa 5 document surface angle formed by the formula [1] W -. 2D / tan6> Note that if the storm 16 F is given by thick lines right triangle, can be easily derive this formula. that is, since the length of the base of the right triangle F is W / 2, height is D, so that tan "= D / (W / 2 ), i.e., formula 1 is obtained. 这样,如果上边长度W大于2D/tan0,则原稿纸飘起时和原稿纸没有飘起时的读取位置的照度相等。 Thus, if W is greater than the length of the upper side 2D / tan0, the original sheet of float illuminance at the time of the reading position and original sheet is not equal to float. 因此,扩大发光元件的宽度可以使上边长度W达到2D/tan0以上。 Thus, expanding the width of the light emitting element can reach the upper side length W 2D / tan0 above. 但是,如已经说明过的那样,因为扩大发光元件的宽度有着种种的不便,故在本发明中,决定最佳化该上边长度W。 However, as already described above, since the expansion of the light emitting element has a width variety of inconveniences, in the present invention, therefore, determine the optimum length of the upper side W. 即,虽然详细内容将在后面叙述,但最好上述角度P是限定在40。 That is, although the details will be described later, but preferably, the angle P is defined at 40. 到55。 55. 的范围。 Range. 因而,在本发明中规定了应使上边长度W满足下式的条件地确定发光元件的宽度。 Accordingly, in the present invention should be a predetermined length of the upper side of the formula satisfies the condition W the width of the light emitting element is determined. 采用这样的做法,可以最小限度地抑制因扩大发光元件的宽度而产生的种种不便,即使原稿纸飘起也能够得到清晰的图像。 With this approach, the inconveniences can be minimized by increasing the width of the light emitting element is generated, even if the original sheet to float clear image can be obtained. 【式2】2D/tan550 < - W < - 2D/tan400这里,为了最佳化上边长度W,确定变更发光元件的宽度,但本发明并非仅限定于此。 [Formula 2] 2D / tan550 <- W <- 2D / tan400 Here, in order to optimize the length of the upper side W, the width determines the change of the light emitting element, but the present invention is not limited only thereto. 例如,因为上边长度W也可以根据光源的中心和读取位置之间的距离变化,故也可以通过变更该距离来最佳化上边长度w。 For example, since the upper side length W may be the distance between the center of the light source and the reading position changes, it is also possible by changing the distance of the upper side optimal length w. 这里,普通的复印机大约需要2mm的焦点深度。 Here, Common copier requires approximately a 2mm depth of focus. 在使本发明适用于这样的复印机时,可知在将上述的角度0设定为40°,同时,将光源的中心和读取位置之间的距离设定为3mm时,大约需要4mm的上边长度W。 When making the present invention is applicable to a copying machine, it was found in the above-mentioned time is set to 0 the angle of 40 °, while the distance between the center of the light source and the reading position is set to 3mm, 4mm length approximately the upper side of W. 此外,还可知为了实现该上边长度W,大约需要3mm 宽的发光元件。 Further, to achieve the apparent length of the upper side W, approximately 3mm wide light-emitting element. 下面给出将上述角度0限定在40。 0 will be given the angle 40 is defined. 到55。 55. 范围的依据。 Based on the range. 在此,使面发光光源的位置和角度产生种种变化,并测量、评价了此时的原稿纸照度和MTF (调制传递函数,Modulation Transfer Function)值。 Here the position and angle of the surface emitting light source produces various changes and measured, evaluated at this time the original sheet illuminance and MTF (modulation transfer function, Modulation Transfer Function) value. 这里,所谓的MTF值也称之为传感器的分辨率。 Here, the MTF value is also called resolution of the sensor. 首先,在长手方向(主扫描方向)连接2个长度160mm.宽度4mm 的黑白面发光光源构成A3尺寸,如图18所示的那样,在透镜14的两侧分别安装该2条A3尺寸的光源5。 First, the long hand direction (main scanning direction) connecting two length 160mm. Width of 4mm Among surface-emitting light sources A3 size, as shown in FIG. 18, are attached to the two sides of the A3 size in the lens 14 The light source 5. 并且,在固定连结面发光光源5的中心O和读取位置Pa之间的线段L的长度r为5mm的状态下, 使该线段L与原稿纸面9所成的角度P从20。 And the angle, in the surface light source fixedly connected to the segment length L r between the center O and the reading position Pa 5 is 5mm in a state of the paper document and the line segment L P of from 9 to 20. 一直变化到70。 Up to 70 changes. ,并测量了此时的原稿纸照度和MTF值。 , And the measured illuminance and the original sheet MTF value at that time. 由其结果可知,得到了以上的原稿纸面照度的是如图19(a)所示的那样,角度0为30。 Seen from the results obtained above paper document illumination is shown in FIG 19 (a) as shown, an angle of 0 to 30. 以上的情况,得到了75%以上的MTF 值的是如图19 (b)所示的那样,角度0为60。 Or more, the obtained MTF values ​​is 75% or more in FIG. 19 (b) as shown, an angle of 0 to 60. 以下的情况。 The following cases. 即,可以说,角度6/从30。 That is, it can be said, the angle 6/30 from. 到60。 60. 是较好的范围。 It is a good range. 此外,还可知,得到了2000&以上的原稿紙面照度的是如图19 (a)所示的那样,角度0为40。 Further, it was verified, as is shown in FIG. 19 (a) 2000 & illuminance above the paper document, the angle 0 was 40. 以上的情况,得到了80%以上的MTF 值的是如图19 (b)所示的那样,角度6>为55。 Or more, to obtain the MTF value is more than 80% in FIG. 19 (b) as shown, the angle 6> 55. 以下的情况。 The following cases. 即,可以说,角度0从40°到55。 That is, it can be said, from the 40 ° angle of 0 to 55. 是特别好的范围。 It is a particularly good range. 以上就是将上述角度0限定在40°到55。 The above is the angle defined at 0 to 40 ° 55. 范围的依据。 Based on the range. 这里,例示的是黑白面发光光源,但在使用了彩色面发光光源时我们也得到了同样的结果。 Here, the surface illustrated is a monochrome light source, but the use of a surface-emitting light color we got the same results. 此外,虽然这里是在使用4mm宽度的面发光光源的同时,固定线段L的长度r为5mm,但由在其他的条件下进行了测量的情况可知,角度0从3O。 Further, although the surface is 4mm width using a light source at the same time, the fixed segment length L r is 5mm, but seen from the case of measurements performed in other conditions, the angle 0 from 3O. 到60。 60. 的情况也是较好的范围, 角度0从4O。 The preferred range is also the case, the angle 0 from 4O. 到55。 55. 的情况也是特别好的范围。 The situation is particularly good range. (实施形态5)此外,如图20所示的那样,为了驱动发光元件,简单的办法就是利用一个个的恒流源M分别驱动发光元件,但如果采用这样的构成则成本将上升。 (Embodiment 5) Further, as shown in Figure 20, for driving the light emitting element, the simplest way is to use a constant current source M th light emitting elements are driven, but if such a configuration will increase the cost. 即,如果从成本方面考虑,则最好是采用利用一个恒流源来驱动多个发光元件的构成。 That is, if the terms of cost, is preferably employed using a constant current source configured to drive the plurality of light emitting elements. 但是,如果单纯地采用利用一个恒流源来驱动多个发光元件的构成,则将有损于光源的长寿命化之类的效果。 However, if the use of a simply configured using the constant current source to drive a plurality of light emitting elements, will be detrimental to the effect of extending the life of the light source or the like. 这是因为即便某个发光元件的某处一点存在膜厚较薄等缺陷,但由于应该流经其他的发光元件的电流汇集到该发光元件上的一点处,故将从此处烧穿薄膜。 This is because even if a light emitting element somewhere point defects such as the presence of a small thickness, but should flow through the current sink to the other light emitting element at a point on the light emitting element, from where it is burn-through film. 因此,在本发明中,为了不招致成本的上升且达到无损于光源的长寿命化这样的效果,我们决定利用以下的构成来驱动发光元件。 Accordingly, in the present invention, in order not to incur a cost increase and reached to such a non-destructive effects of long-life light source, we decided to drive the light emitting element by the following configuration. 即,如图21 (a)所示的那样,经由阻抗体N电气地连接多个发光元件和1个恒流源M。 That is, as shown in (a), 21 shown connecting the plurality of light emitting elements and a constant current source via an electrically resistive body M. N 虽然该阻抗体N的阻抗值没有特别地进行限定,但应该选择远远大于发光元件L的阻抗值的较大的值。 Although the resistance value of the resistor N is not particularly limited, it should choose a larger value of L is much larger than the resistance value of the light emitting element. 如果采用这样的做法,即便在某个发光元件的某处一点存在膜厚较薄等缺陷的情况,由于对阻抗体和发光元件的阻抗值的总和几乎没有影响,故应该流经其他的发光元件的电流不会汇乘到该发光元件上的一点处。 With this approach, even though there is a case that defects such as thin thickness somewhere in a light-emitting element, since the sum of the resistance value of the resistor and the light emitting element has little influence, so that should flow through the light emitting elements of the other current does not sink to the point by the light emitting element. 或者如图21 (b)所示的那样,也可以连接多个阻抗体N和发光元件L,并连接应该在各自的两端施加规定的电压的恒压源O。 Or FIG. 21 (b) as shown, the resistor may be connected to the plurality of light emitting elements and N L, and is connected to a constant voltage source to be applied in the respective predetermined voltage across O. 利用这样的构成,如果选择阻抗体N的阻抗值远远大于发光元件L的阻抗值的较大的值,则也可以得到与上述相同的效果。 Larger value With this configuration, if the impedance value of the impedance thereof selected N L is much larger than the resistance value of the light emitting element, it is possible to obtain the same effect as described above. 如以上这样,在本发明中,确定采用不招致成本的上升且可达到无损于光源的长寿命化的构成来驱动发光元件。 As described above, in the present invention, use is determined without incurring an increase in cost and can achieve a longer life lossless configured to drive the light source to the light emitting element. 另外,在此仅对连接多个发光元件和1个恒压源进行了说明,但与一个恒流源连接的发光元件的数目并没有特别的限定。 Further, in this connection only a plurality of light emitting elements and a constant voltage source has been described, but the number of the light emitting element is connected to a constant current source is not particularly limited. 即,既可以将全部发光元件与1个恒流源相连接,或者也可以逐组对应RGB各种颜色的发光元件地与一个恒流源相连接,进而,还可以每个图l或图5所示的面发光体列G地连接一个恒流源。 That is, either all the light emitting element and a constant current source is connected, or may be set by a color corresponding to the RGB light-emitting element is connected with a constant current source, and further, each may also be 5 or Figure l the surface light emitter shown in column G are connected a constant current source. 当然,可以说对于与一个恒流源相连接的发光元件的数目也是同样的情况。 Of course, it can be said with respect to the number of light emitting elements connected to a constant current source is also the case. 此外,在上述的说明中,例示的是图像读取装置的光源,但本发明也可以适用于打印头这样的图像写入装置的光源。 Further, in the above description, exemplified is a light source of an image reading apparatus, but the present invention is also applicable to a light source apparatus in writing such image printing head. 即,只要是按照透明电极.面发光体.金属电极的顺序在透明基板上形成膜层,并通过对上述的2个电极施加规定的电压而使之发光的光源,均可以适用本发明。 That is, any. Emitter surface. Order of the metal electrode layer is formed on a transparent substrate in accordance with a transparent electrode and a predetermined voltage is applied to the above-described two electrodes of the light emitting source, the present invention can be applied. 如以上这样,按照本发明,即便在某处一点存在膜厚较薄等缺陷, 但因汇集到该阻抗值低的一点处的电流仅有一点点,故不会产生从此处烧穿膜层之类的问题,作为结果,可以谋求图像读取装置的光源的长寿命化。 As described above, according to the present invention, even if there is somewhere a little thin film thickness and other defects, but the current collection at the low point of the resistance value is only a little bit, here it is not generated from burning through the film layer the class of problem, as a result, the light source can be prolonged life of the image reading apparatus. 此外,在本发明中,由于是将在主扫描方向重复排列了对应RGB 各种颜色的面发光体的多个面发光体行相互的主扫描方向的相位不同地排列在副扫描方向上,故可以实现主扫描方向的照度分布均一。 In the present invention, the arrangement is repeated in a main scanning direction corresponding to the RGB line phase emitter surface faces the plurality of light emitters each color mutually different main scanning direction are arranged in the sub-scanning direction, so the main scanning direction can be achieved a uniform illuminance distribution. 进而,按照本发明,因为即便在某处一点存在膜厚较薄等缺陷的情况下,其对阻抗体和发光元件的阻抗值的总和几乎没有影响,故应该流经其他的发光元件的电流不会汇集到该发光元件上的一点处。 Further, according to the present invention, since the case where the presence of even a small thickness defects point somewhere, the sum of the resistance value of the resistor and the light emitting element has little influence, so the current should flow through the light emitting element is not another It brought together to the point on the light emitting element. 即, 可以通过不招致成本的上升且可达到无损于光源的长寿命化的构成来驱动发光元件。 That is, without incurring an increase in cost can be achieved and are detrimental to the life of the light source configured to drive the light emitting element.

Claims (4)

  1. 1. 一种图像读取装置的光源,它按照透明电极、面发光体、金属电极的顺序在透明基板上形成膜层,并通过对上述的2个电极施加规定的电压而发光,其特征在于: 所述光源具有多个面发光体,其中每个所述面发光体对应红、绿、蓝这三种颜色中的一种颜色,所述面发光体被形成为非矩形的平行四边形并在主扫描方向上对所述多个面发光体进行重复排列。 1. An image reading light source apparatus, according to which a transparent electrode, a surface light emitter, the order of the metal electrode layer formed on the transparent substrate, and a predetermined voltage is applied to the above-described two electrodes and a light emitting, characterized in that : a light source having a plurality of surface light emitters, wherein each of said surface light emitter corresponding to red, green, and blue color of the three colors, the emitter surface is formed non-rectangular parallelogram and a main scanning direction of the plurality of surface emitting body repeatedly arranged.
  2. 2. 根据权利要求l所述的图像读取装置的光源,其特征在于:相邻的同种颜色的面发光体在副扫描方向上部分重叠。 L 2. The light source of the image reading apparatus as claimed in claim, wherein: the adjacent surface light emitters of the same color overlap in the sub scanning direction.
  3. 3. 根据权利要求l所述的图像读取装置的光源,其特征在于:使上迷面发光体的面积对应于根据光源的寿命与开口率的相关关系所确定的面积、。 The light source of the image reading apparatus according to claim l, characterized in that: the fans that the area of ​​the surface light emitter corresponding to the determined based on the correlation of the life of the light source to the opening area.
  4. 4. 根据权利要求l所述的图像读取装置的光源,其特征在于:在取目标焦点深度为D、连结光源的中心和读取位置的线段与原稿紙面所成的角度为(?时,确定副扫描方向的上述面发光体的宽度,以使副扫描方向的梯形形状的照度分布的上边长度大于或等于2D/tan55。,并且小于或等于2D/tan40。。 L 4. The light source of the image reading apparatus as claimed in claim, wherein: in obtaining a desired focal depth as D, connecting the center position of the light source and the reading of the original line segment and the angle of the sheet (when? width determination sub-scanning direction of the plane light emitter to the sub-scanning direction length of the upper side illuminance distribution of the trapezoidal shape is greater than or equal to 2D / tan55., and less than or equal to 2D / tan40 ..
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Publication number Priority date Publication date Assignee Title
CN1273641A (en) 1998-06-05 2000-11-15 精工爱普生股份株式会社 Light source and display device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1273641A (en) 1998-06-05 2000-11-15 精工爱普生股份株式会社 Light source and display device

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