CN100406998C - The light source apparatus - Google Patents

The light source apparatus Download PDF

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Publication number
CN100406998C
CN100406998C CN 200510091703 CN200510091703A CN100406998C CN 100406998 C CN100406998 C CN 100406998C CN 200510091703 CN200510091703 CN 200510091703 CN 200510091703 A CN200510091703 A CN 200510091703A CN 100406998 C CN100406998 C CN 100406998C
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light
surface
prism
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CN 200510091703
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CN1737662A (en
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千葉一清
山下友義
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三菱丽阳株式会社
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Priority to JP2000379089 priority
Priority to JP2001-314149 priority
Priority to JP2001-325205 priority
Application filed by 三菱丽阳株式会社 filed Critical 三菱丽阳株式会社
Priority to CN01820374.4 priority
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Abstract

具有引导一次光源的光并且从出射面(33)倾斜出射的导光体(3)和与光出射面相邻配置的光偏转元件(4)。 A light guide having a light emission surface and (33) of the light guide member is inclined from the exit (3) and a light-light deflection member (4) disposed adjacent the exit face. 光偏转元件的入光面(41)上形成并排的多个棱镜条。 The light incident surface of the deflection element (41) is formed on a plurality of juxtaposed prismatic ridge. 远离该一次光源侧的棱镜面在设想虚拟棱镜条(I)时,以所述虚拟棱镜条的形状为基准,形成凸曲面形状,该虚拟棱镜条使导光体光出射面出射的光的出射光分布中的峰值出射光从一个棱镜面进入,在另一棱镜面进行内部全反射后,从出光面(42)往所希望的方向出射,并且按与光偏转元件中棱镜条排列间距相同的间距排列,其顶角θ为50度~70度。 Away from the primary prism surface light source side when envisaged virtual prismatic ridge (the I), the shape of the virtual prism component strip as a reference, a convex curved shape, the virtual prismatic ridges of the light guide the light the light exit surface of the peak distribution of light emitted in the outgoing light enters from a prism face, after total internal reflection on the other prism face (42) towards a desired direction is emitted from the light exit surface, and in the arrangement with the article prismatic light deflection elements are the same distance arranged at a pitch, which is the apex angle θ is 50 degrees to 70 degrees. 用棱镜条排列间距P归一化后的曲率半径r的值(r/P)为7~30,棱镜面与虚拟棱镜条(I)的棱镜面的最大距离d与棱镜条的排列间距P的比(d/P)为0.05%~5%。 With prismatic ridges arrangement pitch P normalized value of the radius of curvature r of the one of (r / P) 7 to 30, the virtual prismatic ridge (I) the maximum distance prism surface of the prism surface d of the arrangement of the prismatic ridge of the pitch P ratio (d / P) is 0.05% to 5%.

Description

光源装置本申请为下述申请的分案申请:原申请的申请日(国际申请日):2001年12月11日原申请的国家申请号:01820374.4 (国际申请号:PCT/JP01/讓2)原申请的发明名称:光源装置技术领域本发明涉及构成笔记本个人计算机和液晶电视机中用作显示部的液晶显示装置等的侧照式光源装置,尤其涉及配置在导光体的光出射面侧的光偏转元件的改进。 The light source device of the present application is a divisional application of the following application: the filing date of the parent application (international filing date): Country Application No. 2001, December 11 original application: 01820374.4 (International Application No: PCT / JP01 / 2 let) parent application entitled: technical field the present invention relates to a light source device constituting the liquid crystal television and a notebook personal computer is used as the liquid crystal display unit of the edge-lit light source device such as a display, particularly to a light exit surface side of the light guide is arranged at improved light deflection element. 技术背景近年来,彩色液晶显示装置作为便携式笔记本个人计算机和个人计算机等的监视器,或者作为液晶电视机和视频综合型液晶电视机等的显示部,在各种领域广泛使用。 BACKGROUND ART In recent years, color liquid crystal display device of a notebook personal computer and a portable personal computer, a monitor, or a liquid crystal televisions and liquid crystal televisions, etc. integrated video display unit, is widely used in various fields. 随着信息处理量增大、需求多样化、适应多媒体等,液晶显示装置大力进行大屏幕化、高清晰化。 With the information processing amount increases, the diverse needs, multimedia adaptation, the liquid crystal display device of a large screen vigorously, higher definition. 液晶显示装置基本上由背后照明部和液晶显示元件部组成。 The liquid crystal display device is substantially displayed by the backlight unit and a liquid crystal element unit composed. 作为背后照明部,有光源配置在液晶显示元件部正下方的下照式和光源配置成与导光体侧端面对置的侧照式。 A backlight unit, a light source unit disposed directly below the display element and the light source is illuminated and the light guide configured to face the opposite side end of the edge-lit liquid crystal. 从液晶显示装置小型化的角度看,多数采用侧照式。 From the perspective of downsizing the liquid crystal display device, the majority of uses edge-lit. 然而,近年来,显示屏幕尺寸较小且用作观看方向范围较窄(例如便携电话机)的显示部的液晶显示装置等中,根据减少耗电的观点,作为侧照式背后照明部,为了有效利用一次光源发出的光量, 一直利用的是:尽可能减小屏幕出射光束的扩展角,使光集中在所需角度范围出射。 However, recently, as the display screen size is smaller and a narrower range of viewing direction (e.g., cellular phone) in the liquid crystal display device or the like of a display unit, power consumption is reduced according to the viewpoint, as a back-side illuminated lighting unit for effective utilization of light emitted from the primary light source, have been utilized are: the screen to minimize the spread angle of the light beam, the light focus at a desired exit angle range. 作为这样限定观'看方向范围并且集中在较窄范围进行光出射以便提高一次光源的光量利用效率和减少耗电的光源装置,本申请人在日本特愿2000—265574号专利申请中,提出采用靠近导光体的光出射面且双面具有棱镜形成面的棱镜板。 As so defined concept 'look direction range and focus light emitted in a narrow range in order to improve the utilization efficiency of the light amount of the primary light source and the light source device to reduce power consumption, the present applicant in Japanese Unexamined Patent Application No. 2000-265574, proposed using close to the light guide light exit surface and a double-sided prism sheet having a prism surface is formed. 该双面棱镜板在作为一个面的入光面和作为另一个面的出光面分别形成相互平行的多个棱镜条,使入光面和出光面上棱镜条方向一致,并且在对应的位置配置各棱镜条。 The double sided prism plate is formed as a plane surface as a light incident surface and the other surface of the plurality of prismatic ridges were parallel to each other, so that the light incident surface and the light exit surface of the prism section in the same direction, and arranged at positions corresponding to each prism strip. 据此,从导光体的光出射面出射,在对该出射面倾斜的方向具有出射光峰值,并且分布在适当角度范围的光,从棱镜板入光面的一个棱镜面入射,并且在另一棱镜面往内部反射,进而在出光面的棱镜中受到折射作用,使光集中到比较窄的所需方向出射。 Accordingly, from the light exit surface of the light guide body having a light emission light peak, and is distributed in a suitable angular range in the direction of the exit surface is inclined, a prism face incident light incident surface of the prism plate and on the other internal reflection to a prism surface, and further by the refraction in the prism surface, the light focused to a relatively narrow exit in the desired direction. 利用这种光源装置,可集中在较小的角度范围出射,但作为用作光偏转元件的棱镜板, 必须使两面相互平行的多个棱镜条在入光面和出光面上棱镜条方向一致,并且将各棱镜条配置在相互对应的位置,其成形复杂。 With this light source apparatus can be concentrated in a smaller exit angle range, but as a prism sheet used as the light deflecting element, a plurality of prismatic ridges on both sides must be parallel to each other in the light incident surface and consistent direction of the prism surface of the article, and the prismatic ridge disposed at each of the positions corresponding to each other, forming a complex thereof. 特表平9—507584号公报、特开平9—105804号公报、特开平11—38209号公报、特开2000—35763号公报以用棱镜板使导光体出射光偏转时提高光汇聚性和方向性为目的,提出将构成棱镜板的棱镜条中远离光源侧的棱镜面做成凸曲面形状。 Japanese Kohyo Publication No. 9-507584, Laid-Open Publication No. 9-105804, Japanese Patent Publication No. 11-38209, Laid-Open Patent Publication No. 2000-35763 to improve the light exiting the light guide to collect the light deflected by the prism sheet and the direction for the purpose, made from the light source side of the prism surface of the prism in the prism plate constituting the article a convex curved shape. 然而,这些公报记载的凸曲面状棱镜面,其曲率半径均较大或较小,因而导光体的出射光分布或者不能达到视野足够窄, 或者使视野非常窄,或者有时反而扩大视野。 However, the convex curved surface prism described in these publications, which are larger or smaller radius of curvature, and therefore the light guide member or a distribution of light emitted can not be achieved sufficiently narrow field of view, or a very narrow field of view, or sometimes amplify the field of view. 而且,这些公报记载的导光体不能赋予其光出射机构高方向性,出射的光分布范围较大,即使在棱镜板聚光,也不能达到亮度充分提高。 Further, the light guide body disclosed in these publications can not impart a high directivity light emitting means, a larger range of emitted light distribution, even if the prism sheet condensing, brightness can not be achieved sufficiently improved. 发明内容本发明的目的在于提供一种光源装置,将出射光分布控制得非常窄, 一次光源的光量利用效率可提高(即,使一次光源发出的光集中到所需观看方向出射的效率提高),亮度极高,而且结构简化,便于提高图像质量。 SUMMARY OF THE INVENTION An object of the present invention is to provide a light source apparatus, the exit light distribution control very narrow, a quantity of light use efficiency of light can be improved (i.e., light primary light source is concentrated to the desired viewing direction emitted efficiency) , high brightness, and simplifying the structure, easy to improve the image quality. 根据本发明,作为达到如上所述目的的装置,提高一种光源装置,该装置配备一次光源、 具有入射该一次光源所发光的光入射面和引导入射光并将其出射的光出射面的导光体以及与该导光体的光出射面相邻配置的光偏转元件,其特征在于,该光偏转元件具有所处位置与所述导光体的光出射面对置的入光面和处于其相反侧的出光面,所述入光面上形成有相互平行配置的多个棱镜条,该棱镜条具有两个棱镜面,至少远离所述一次光源侧的棱镜面在设想多个虚拟棱镜条时,以所述虚拟棱镜条的形状为基准,形成凸曲面形状,该虚拟棱镜条使所述导光体光出射面出射的光的出射光分布中的峰值出射光从一个棱镜面进入,在另一棱镜面进行内部全反射后,从所述出光面往所希望的方向出射, 并且按与所述光偏转元件中棱镜条排列间距相同的间距排列,其顶 According to the present invention, as a means to achieve the object as described above, to improve a light source device which is equipped with a light source means, having an emission surface of the light guide enters the primary light source emitting a light guide incident surface and incident light and outgoing and the light guide and the light exit surface of the light deflection element arranged adjacent to the light, wherein the light deflection element having a location of the light guide light exit face opposing the light incident surface and in the opposite side surface of the light-receiving surface is formed with a plurality of prismatic ridges arranged parallel to each other, the prismatic ridge having two prism surfaces, at least the side away from the primary light source is contemplated in the plurality of virtual prism surface prismatic ridges when, in the shape of the virtual prism strip as a reference, a convex curved shape, the virtual prismatic ridges so that the light guide light peak distribution of light emitted emitting surface of the light exiting the outgoing light enters from a prism face, in after a further prism surface for total internal reflection from the surface to a desired exit direction, and in the arrangement of the prismatic light deflection elements are arranged at the same pitch spacing strips, the top 9为50度〜70度;所述凸曲面形状按所述棱镜条的排列间距P归一化所得的曲率半径r的值(r/P)为7〜30。 9 ~ 70 degrees to 50 degrees; the convex curved shape in the arrangement of the prism strip spacing value P of the radius of curvature r of the resulting normalized (r / P) of 7~30. 本发明的一形态中,所述光偏转元件中各棱镜条的凸曲面形状棱镜面和所述虚拟棱镜条棱镜面的最大距离d与所述棱镜条排列间距P的比(d/P )为0.05%〜5%。 One aspect of the present invention, each of the convex curved surface of the optical deflector element prismatic bar shape and the maximum distance d prism surface of the prism strips and the virtual prism face of the prism arrangement than the stripe pitch P (d / P) is 0.05% ~ 5%. 本发明的一形态中,所述虚拟棱镜条的一次光源邻近侧棱镜面的倾斜角为45度以上。 One aspect of the present invention, the inclination angle of the virtual prism strip light source adjacent the primary side of the prism surface is 45 degrees or more. 本发明的一形态中,所述虚拟棱镜条的截面是等腰三角形。 One aspect of the present invention, the cross section of the virtual prism is an isosceles triangle strip. 本发明的一形态中,所述导光体的光出射面和/或其相反侧的背面是具有方向性光出射功能的面。 One aspect of the present invention, the guide and / or the back surface opposite the light emitting member having a light exit plane directivity of the light function. 本发明的一形态中,所述具有方向性光出射功能的面的平均倾斜角为0.5度〜15度。 One aspect of the present invention, the average tilt angle having directionality of the light exit surface function is a ~ 15 degrees 0.5 degrees. 本发明的一形态中,所述具有方向性光出射功能的面是粗糙面或多个棱镜条排列成的面。 One aspect of the present invention, the function having a directional light exit surface is a rough surface or a surface arranged in a plurality of prismatic ridges. .根据本发明,为了达到如上所述的目的,提供一种光源装置,该装置配备一次光源、具有入射该一次光源所发光的光入射面和引导入射光并将其出射的光出射面的导光体以及与该导光体的光出射面相邻配置的光偏转元件,其特征在于,该光偏转元件具有所处位置与所述导光体的光出射面对置的入光面和处于其相反侧的出光面,所述入光面上形成有相互平行配置的多个棱镜条,该棱镜条具有两个棱镜面,至少远离所述一次光源侧的棱镜面在设想多个虚拟棱镜条时,以所述虚拟棱镜条的形状为基准,形成凸曲面形状,该虚拟棱镜条使所述导光体光出射面出射的光的出射光分布中的峰值出射光从一个棱镜面进入,在另一棱镜面进行内部全反射后,从所述出光面往所希望的方向出射, 并且按与所述光偏转元件中棱镜条排列间距相同的间距排列,其顶角e为5 According to the present invention, in order to achieve the above object, there is provided a light source apparatus which is equipped with a light source having an emission surface of the light guide enters the primary light source emitting a light guide incident surface and incident light and outgoing and the light guide and the light exit surface of the light deflection element arranged adjacent to the light, wherein the light deflection element having a location of the light guide light exit face opposing the light incident surface and in the opposite side surface of the light-receiving surface is formed with a plurality of prismatic ridges arranged parallel to each other, the prismatic ridge having two prism surfaces, at least the side away from the primary light source is contemplated in the plurality of virtual prism surface prismatic ridges when, in the shape of the virtual prism strip as a reference, a convex curved shape, the virtual prismatic ridges so that the light guide light peak distribution of light emitted emitting surface of the light exiting the outgoing light enters from a prism face, in after a further prism surface for total internal reflection from the surface to a desired exit direction, and in the arrangement of the prismatic light deflection elements are arranged at the same pitch spacing bars, which apex angle e is 5 0度〜70度;所述凸曲面形状的棱镜面与所述虚拟棱镜条的棱镜面的最大距离d与所述棱镜条的排列间距P的比(d/P)为0.2%〜2%。 0 ° ~ 70 °; the convex curved shape of the virtual prism face of the prism surface of the prism strips the ratio P of the maximum distance d (d / P) is 0.2% ~ 2% of the arrangement pitch of the prism strips. 本发明的一形态中,所述棱镜条具有与所述虚拟棱镜条共同的底部,所述凸曲面形状是用所述棱镜条排列间距P归一化所得曲率半径r的值(r/P)为2〜80的大致凸圆柱面形状。 One aspect of the present invention, the prismatic ridges having a common bottom strip and the virtual prism, the convex curved shape is a stripe arrangement pitch of the prism value P obtained normalized radius of curvature r (r / P) a substantially cylindrical convex surface shape of 2~80. 本发明的一形态中,所述虚拟棱镜条的一次光源邻近侧棱镜面的倾斜角为45度以上。 One aspect of the present invention, the inclination angle of the virtual prism strip light source adjacent the primary side of the prism surface is 45 degrees or more. 本发明的一形态中,所述虚拟棱镜条的截面是等腰三角形。 One aspect of the present invention, the cross section of the virtual prism is an isosceles triangle strip. 本发明的一形态中,所述导光体的光出射面和/或其相反侧的背面是具有方向性光出射功能的面。 One aspect of the present invention, the guide and / or the back surface opposite the light emitting member having a light exit plane directivity of the light function. 本发明的一形态中,所述具有方向性光出射功能的面的平均倾斜角为0.5度〜15度。 One aspect of the present invention, the average tilt angle having directionality of the light exit surface function is a ~ 15 degrees 0.5 degrees. 本发明的一形态中,所述具有方向性光出射功能的面是粗面或多个棱镜条排列成的面。 One aspect of the present invention, the light exit surface has a directivity function is rough or strips arranged in a plurality of prismatic surfaces. 据本发明,作为达到上述目的的装置,提供一种光源装置,该装置配备主光源、具有入射该主光源所发光的光入射面和引导入射光并将其出射的光出射面的导光体以及与该导光体的光出射面相邻配置的光偏转元件,其特征在于,该光偏转元件具有所处位置与所述导光体的光出射面对置的入光面和处于其相反侧的出光面,所述入光面上形成有相互平行配置的多个棱镜条,该棱镜条具有两个棱镜面,至少一个棱镜面形成凸曲面形状,该形状具有的倾斜角大于如下所述的倾斜角,即该所述的倾斜角为,假设沿所述导光体光出射面所发光的出射光分布中峰值出射光方向掠过相邻虚拟棱镜条顶部的虚拟光,在相邻虚拟棱镜条另一棱镜面内部全反射,在比该全反射的位置接近所述出光面的位置,所述虚拟棱镜条的棱镜面的至少一部分对所述出光面形成的倾斜角 According to the present invention, as a means to achieve the above object, there is provided a light source apparatus which is equipped with a primary light source, having a light source emitting a main incident on the light incident surface and incident light and guiding the light emitted from the light emitting surface of the guide and a light deflection element adjacent to the light guide light exit surface is arranged, wherein the light deflection element having a location of the light guide light exit face opposing the light incident surface and in the opposite the side surface of the light-receiving surface is formed with a plurality of prismatic ridges arranged parallel to each other, the prismatic ridge having two prism surfaces, at least one prism surface is formed convex curved shape that has an inclination angle larger than the following the angle of inclination, i.e. the inclination angle of the assumed direction of the light guide light virtual light emitting surface distribution of light emitted in the peak emission direction of light passing outgoing virtual prismatic ridge adjacent to the top of the adjacent virtual Article prismatic other internal total reflection prism surface, than the position of the total reflection surface near the position of the virtual prism face of the prism strips at least a portion of an inclination angle of said surface is formed 本发明的一形态中,所述棱镜条具有与所述虚拟棱镜条共同的底部,所述凸曲面形状是用所述棱镜条排列间距P归一化所得曲率半径r的值(r/P)为2〜80的大致凸圆柱面形状。 One aspect of the present invention, the prismatic ridges having a common bottom strip and the virtual prism, the convex curved shape is a stripe arrangement pitch of the prism value P obtained normalized radius of curvature r (r / P) a substantially cylindrical convex surface shape of 2~80. 本发明的一形态中,所述光偏转元件的各棱镜条凸曲面形状的棱镜面与所述虚拟棱镜条的棱镜面的最大距离d与所述棱镜条的排列间距P的比(d/P)为0.05%〜5%。 One aspect of the present invention, the prism surface of the prism pieces of the convex curved shape of the prismatic light deflection element strip virtual prism face maximum distance d of the arrangement of the prismatic ridges of the pitch ratio P (d / P ) is 0.05% ~ 5%. 本发明的一形态中,所述虚拟透镜条的主光源邻近侧的棱镜面的倾斜角为45度以上。 One aspect of the present invention, the inclination angle of the virtual prism face of the main light source adjacent the side of the lens section is not less than 45 degrees. 本发明的一形态中,所述虚拟棱镜条的截面是等腰三角形。 One aspect of the present invention, the cross section of the virtual prism is an isosceles triangle strip. 在本发明的一形态中,所述导光体的光出射面和/或其相反侧的背面是具有方向性光出射功能的面。 In one aspect of the invention, the guide and / or the back surface opposite the light emitting member having a light exit plane directivity of the light function. 在本发明的一形态中,所述具有方向性光出射功能的面的平均倾斜角为0.5度一15度。 In one aspect of the present invention, the average tilt angle having directionality of the light exit plane functionality for a 0.5 degree to 15 degrees. 本发明的一形态中,所述具有方向性光出射功能的面是粗面或多个棱镜条排列成的面。 One aspect of the present invention, the light exit surface has a directivity function is rough or strips arranged in a plurality of prismatic surfaces. 根据本发明,作为达到上述目的的装置,提供一种光源装置,该装置配备一次光源、具有入射该一次光源所发光的光入射面和引导入射光并将其出射的光出射面的导光体以及与该导光体的光出射面相邻配置的光偏转元件,其特征在于,该光偏转元件具有所处位置与所述导光体的光出射面对置的入光面和处于其相反侧的出光面,所述入光面上形成有相互并列配置的多个棱镜条,该棱镜条具有两个棱镜面,至少一个棱镜面在设想多个虚拟棱镜条时,以所述虚拟棱镜条的形状为基准,形成凸曲面形状,该虚拟棱镜条使所述导光体光出射面出射的光的出射光分布中的峰值出射光从一个棱镜面进入,在另一棱镜面进行内部全反射后,从所述出光面往所希望的方向出射,并且按与所述光偏转元件中棱镜条排列间距相同的间距排列,其顶角e为50度〜70度;所述导 According to the present invention, as a means to achieve the above object, there is provided a light source apparatus which is equipped with a light source having a light exit surface of the light guide member enters the primary light source emitting a light guide incident surface and incident light and outgoing and a light deflection element adjacent to the light guide light exit surface is arranged, wherein the light deflection element having a location of the light guide light exit face opposing the light incident surface and in the opposite the side surface of the light-receiving surface is formed with a plurality of prismatic strips arranged in parallel to each other, the prismatic ridge having two prism surfaces, at least one prism surface is contemplated when a plurality of virtual prismatic ridge to the virtual prismatic ridges It shapes as a reference, a convex curved shape, the virtual prismatic ridges so that the light guide light peak distribution of light emitted emitting surface of the light exiting the outgoing light enters from a prism face, internally totally reflected on the other prism surface after, from the surface to a desired exit direction, and in the arrangement of the prismatic light deflection elements are arranged at the same pitch spacing bars, which apex angle e is 50 degrees ~ 70 degrees; the guide 体的光出射面和/或其相反侧的背面是平均倾斜角为0.5度〜15度的具有方向性光出射功能的面。 Light exit surface of the body and / or the back surface side opposite to the average tilt angle of 0.5 degrees ~ 15 degrees directional light exit surface function. 本发明的一形态中,所述棱镜条具有与所述虚拟棱镜条共同的底部,所述凸曲面形状是用所述棱镜条排列间距P归一化所得曲率半径r的值(r/P)为2〜80的大致凸圆柱面形状。 One aspect of the present invention, the prismatic ridges having a common bottom strip and the virtual prism, the convex curved shape is a stripe arrangement pitch of the prism value P obtained normalized radius of curvature r (r / P) a substantially cylindrical convex surface shape of 2~80. 本发明的一形态中,所述光偏转元件的各棱镜条凸曲面形状的棱镜面与所述虚拟棱镜条的棱镜面的最大距离d与所述棱镜条的排列间距P的比(d/P)为0.05%〜5%。 One aspect of the present invention, the prism surface of the prism pieces of the convex curved shape of the prismatic light deflection element strip virtual prism face maximum distance d of the arrangement of the prismatic ridges of the pitch ratio P (d / P ) is 0.05% ~ 5%. 本发明的一形态中,所述虚拟棱镜条的一次光源邻近侧的棱镜面的倾斜角为45度以上。 One aspect of the present invention, the inclination angle of the virtual prism face of the prism strips adjacent the side of the primary light source is 45 degrees or more. 本发明的一形态中, 所述虚拟棱镜条的截面是等腰三角形。 One aspect of the present invention, the cross section of the virtual prism is an isosceles triangle strip. 本发明的一形态中,所述具有方向性光出射功能的面是粗面或多个棱镜条排列成的面。 One aspect of the present invention, the light exit surface has a directivity function is rough or strips arranged in a plurality of prismatic surfaces. 根据本发明,作为达到上述目的的装置,提供一种光源装置,其特征在于,配备一次光源、具有入射该一次光源所发光的光入射面和引导入射光并将其出射的光出射面的导光体以及与该导光体的光出射面相邻配置并且具有入光面和其相反侧的出光面的光偏转元件,该入光面位于与所述导光体光出射面相对的位置且形成有相互平行排列的多个棱镜条;所述导光体光出射面出射的光在与所述光入射面和光出射面垂直的面内的出射光分布的半值宽度B为36度以下,所述光偏转元件出光面出射的光在与所述光入射面和光出射面垂直的面内的出射光分布的半值宽度A为所述半值宽度B的30%〜95%。 According to the present invention, as a means to achieve the above object, there is provided a light source device, wherein, with a light source having an emission surface of the light guide enters the primary light source emitting a light guide incident surface and incident light and outgoing light deflection element arranged adjacent to the light exit surface and having a light incident surface and the opposite side of the light exit surface and the light guiding body, the light incident surface is located at the position of the light guide opposite to the light exit surface and is formed with a plurality of prismatic bars parallel to each other; and the light guide light exit surface of the light in the width of the light incident surface and the light half-value exiting the exit plane plane perpendicular to the light distribution B is 36 degrees or less, the surface of the light deflection element the light emitted in the light incident surface and light exit surface perpendicular to the exit surface of the light distribution within the half-width a of the half-value width B of 30% ~ 95% of. 本发明的一形态中,所述光偏转元件出光面出射的光在与所述光入射面和光出射面垂直的面内的出射光分布的半值宽度A为所述半值宽度B的30X〜80X。 One aspect of the present invention, the light deflecting 30X~ surface emitted light in half-width A of the light incident surface and an exit in the plane of the light exit plane perpendicular to the light distribution of the half-value width B of the elements shown 80X. 本发明的一形态中,所述光偏转元件出光面出射的光在与所述光入射面和光出射面垂直的面内的出射光分布的半值宽度A为所述半值宽度B的30X〜70X。 One aspect of the present invention, the light deflecting 30X~ surface emitted light in half-width A of the light incident surface and an exit in the plane of the light exit plane perpendicular to the light distribution of the half-value width B of the elements shown 70X. 本发明的一形态中,所述光偏转元件出光面出射的光在与所述光入射面和光出射面垂直的面内的出射光分布的半值宽度A为5度〜25度。 One aspect of the present invention, the surface of the light deflection element emitted light in half-width A and the exit in the incident surface and light exit surface perpendicular to the plane of the light distribution is 5 degrees ~ 25 degrees. 本发明的一形态中,所述光偏转元件的入光面上形成的棱镜条具有两个棱镜面,至少一个棱镜面在设想多个虚拟棱镜条时,以所述虚拟棱镜条的形状为基准,形成凸曲面形状,该虚拟棱镜条使所述导光体光出射面出射的光的出射光分布中的峰值出射光从一个棱镜面进入,在另一棱镜面进行内部全反射后,从所述出光面往所希望的方向出射,并且按与所述光偏转元件中棱镜条排列间距相同的间距排列,其顶角e为50度〜70度。 One aspect of the present invention, the prism strips formed on the light incident surface of the light deflection element having two prism surfaces, the shape of the at least one prism surface is contemplated when a plurality of virtual prismatic strips to the strip as a reference a virtual prism after forming a convex curved shape, the virtual prism strips the light guide light peak distribution of light emitted emitting surface of the light exiting the outgoing light enters from a prism face, internally totally reflected on the other prism surface, from the the said surface to a desired exit direction, and in the arrangement of the prismatic light deflection elements are arranged at the same pitch spacing bars, which apex angle e is 50 degrees ~ 70 degrees. 本发明的一形态中,所述棱镜条具有与所述虚拟棱镜条共同的底部,并且所述凸曲面形状是按所述棱镜条的排列间距P归一化所得的曲率半径r的值(r/P)为2〜80的大致凸圆柱状。 One aspect of the present invention, the prismatic ridges having a bottom strip with the virtual common prism, and the convex curved shape of the pitch P obtained normalized by the radius of curvature r of the arrangement of the prism strips value (r / P) is substantially convex cylindrical shape of 2~80. 本发明的一形态中,所述光偏转元件的各棱镜条凸曲面形状的棱镜面与所述虚拟棱镜条的棱镜面的最大距离d与所述棱镜条的排列间距P的比(d/P)为0.05%〜5%。 One aspect of the present invention, the prism surface of the prism pieces of the convex curved shape of the prismatic light deflection element strip virtual prism face maximum distance d of the arrangement of the prismatic ridges of the pitch ratio P (d / P ) is 0.05% ~ 5%. 本发明的一形态中,所述虚拟棱镜条的一次光源邻近侧的棱镜面的倾斜角为45度以上。 One aspect of the present invention, the inclination angle of the virtual prism face of the prism strips adjacent the side of the primary light source is 45 degrees or more. 本发明的一形态中,所述虚拟棱镜条的截面是等腰三角形。 One aspect of the present invention, the cross section of the virtual prism is an isosceles triangle strip. 本发明的一形态中,所述导光体的光出射面和/或其相反侧的背面是具有方向性光出射功能的面。 One aspect of the present invention, the guide and / or the back surface opposite the light emitting member having a light exit plane directivity of the light function. 本发明的一形态中,所述具有方向性光出射功能的面的平均倾斜角为0.5度〜15度。 One aspect of the present invention, the average tilt angle having directionality of the light exit surface function is a ~ 15 degrees 0.5 degrees. 本发明的一形态中,所述具有方向性光出射功能的面是粗糙面或多个棱镜条排列成的面。 One aspect of the present invention, the function having a directional light exit surface is a rough surface or a surface arranged in a plurality of prismatic ridges. 根据本发明,作为达到如上所述目的的装置,提供一种光源装置,其特征在于,配备一次光源、具有入射该一次光源所发光的光入射面和引导入射光并将其出射的光出射面的导光体以及与该导光体的光出射面相邻配置并且具有入光面和其相反侧的出光面的光偏转元件,该入光面位于与所述导光体光出射面相对的位置且形成有相互并列排列的多个棱镜条;所述导光体光出射面出射的光在与所述光入射面和光出射面垂直的面内的出射光分布的半值宽度B超过36度,所述光偏转元件出光面出射的光在与所述光入射面和光出射面垂直的面内的出射光分布的半值宽度A为所述半值宽度B的30%〜70%。 According to the present invention, as a means to achieve the object described above, provides a light source apparatus, characterized in that, with the primary light source, having a light source incident on the light incident surface and emitting incident light and guiding the emitted light exit surface a light guide and a light guide member disposed adjacent to the light exit surface and having a light incident surface and the opposite side surface of the light deflection element, the light incident surface of the light guide member positioned light exit face opposite position and forming a plurality of prismatic ridge has parallel aligned with each other; and the light guide light exit surface of the light in the width of the light incident surface and the light perpendicular to an exit in a plane at half maximum of the light distribution of the emission surface B exceeds 36 degrees , the surface of the light deflection element the light emitted at the light incident surface and light exit surface perpendicular to the exit surface of the light distribution within the half-width a of the half-value width of 30% ~ 70% B is. 本发明的一形态中,所述光偏转元件出光面出射的光在与所述光入射面和光出射面垂直的面内的出射光分布的半值宽度A为所述半值宽度B的30X〜60X。 One aspect of the present invention, the light deflecting 30X~ surface emitted light in half-width A of the light incident surface and an exit in the plane of the light exit plane perpendicular to the light distribution of the half-value width B of the elements shown 60X. 本发明的一形态中,所述光偏转元件出光面出射的光在与所述光入射面和光出射面垂直的面内的出射光分布的半值宽度A为所述半值宽度B的30X〜50X。 One aspect of the present invention, the light deflecting 30X~ surface emitted light in half-width A of the light incident surface and an exit in the plane of the light exit plane perpendicular to the light distribution of the half-value width B of the elements shown 50X. 本发明的一形态中,所述光偏转元件出光面出射的光在与所述光入射面和光出射面垂直的面内的出射光分布的半值宽度A为25度以下。 One aspect of the present invention, the surface of the light deflection element emitted light in half-width A and the exit in the incident surface and light exit surface perpendicular to said light distribution plane is 25 degrees or less. 本发明的一形态中,所述光偏转元件的入光面上形成的棱镜条具有两个棱镜面,至少一个棱镜面在设想多个虚拟棱镜条时,以所述虚拟棱镜条的形状为基准,形成凸曲面形状,该虚拟棱镜条使所述导光体光出射面出射的光的出射光分布中的峰值出射光从一个棱镜面进入,在另一棱镜面进行内部全反射后,从所述出光面往所希望的方向出射,并且按与所述光偏转元件中棱镜条排列间距相同的间距排列,其顶角0为50度〜70度。 One aspect of the present invention, the prism strips formed on the light incident surface of the light deflection element having two prism surfaces, the shape of the at least one prism surface is contemplated when a plurality of virtual prismatic strips to the strip as a reference a virtual prism after forming a convex curved shape, the virtual prism strips the light guide light peak distribution of light emitted emitting surface of the light exiting the outgoing light enters from a prism face, internally totally reflected on the other prism surface, from the the said surface to a desired exit direction, and the press element and the light deflecting prism arrangement pitch strips are arranged at the same pitch, 50 ° apex angle of 0 ~ 70 degrees. 本发明的一形态中,所述棱镜条具有与所述虚拟棱镜条共同的底部,并且所述凸曲面形状是按所述棱镜条的排列间距P归一化所得的曲率半径r的值(r/P)为2〜80的大致凸圆柱状。 One aspect of the present invention, the prismatic ridges having a bottom strip with the virtual common prism, and the convex curved shape of the pitch P obtained normalized by the radius of curvature r of the arrangement of the prism strips value (r / P) is substantially convex cylindrical shape of 2~80. 本发明的一形态中,所述光偏转元件的各棱镜条凸曲面形状的棱镜面与所述虚拟棱镜条的棱镜面的最大距离d与所述棱镜条的排列间距P的比(d/P)为0.05%〜5%。 One aspect of the present invention, the prism surface of the prism pieces of the convex curved shape of the prismatic light deflection element strip virtual prism face maximum distance d of the arrangement of the prismatic ridges of the pitch ratio P (d / P ) is 0.05% ~ 5%. 本发明的一形态中,所述虚拟棱镜条的一次光源邻近侧的棱镜面的倾斜角为45度以上。 One aspect of the present invention, the inclination angle of the virtual prism face of the prism strips adjacent the side of the primary light source is 45 degrees or more. 本发明的一形态中,所述虚拟棱镜条的截面是等腰三角形。 One aspect of the present invention, the cross section of the virtual prism is an isosceles triangle strip. 本发明的一形态中,所述导光体的光出射面和/或其相反侧的背面是具有方向性光出射功能的面。 One aspect of the present invention, the guide and / or the back surface opposite the light emitting member having a light exit plane directivity of the light function. 本发明的一形态中,所述具有方向性光出射功能的面的平均倾斜角为0.5度〜15度。 One aspect of the present invention, the average tilt angle having directionality of the light exit surface function is a ~ 15 degrees 0.5 degrees. 本发明的一形态中,所述具有方向性光出射功能的面是粗糙面或多个棱镜条排列成的面。 One aspect of the present invention, the function having a directional light exit surface is a rough surface or a surface arranged in a plurality of prismatic ridges. 附图说明图1是示出本发明的面光源装置的图解立体图; 图2是光偏转元件入光面中棱镜条形状的说明图; 图3是示出本发明的面光源装置的图解立体图。 BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram showing a perspective view of a surface light source device according to the present invention; FIG. 2 is a light deflection element into the surface illustrated in FIG bar prism shape; FIG. 3 is a diagram showing a perspective view of a surface light source device according to the present invention. 具体实施方式下面,参照附图说明本发明的实施形态。 DETAILED DESCRIPTION The following describes embodiments of the present invention with reference to. 图l是示出本发明的面光源装置一实施形态的图解立体图。 Figure l is a diagram illustrating the surface light source device of the present embodiment of the invention illustrating a perspective view showing a state. 如图1所示,本发明的面光源装置的组成部分包含将至少一个侧端面作为光入射面31并且将与其大致正交的一个表面作为光出射面33的导光体3、配置成与该导光体3的光入射面31对置并且用光源反射器2 覆盖的一次光源1、配置在导光体3的光出射面上方的光偏转元件4和配置成与导光体3中光出射面33的背面34对置的光反射元件5。 As shown, part of the surface light source device according to the present invention comprises a light emitting surface 33 of the guide member 3, arranged with the at least one side end surface as a light incident surface 31 and substantially perpendicular thereto as a surface light light guide light incident surface 31 opposed to 3 and with a light source reflector 2 is covered by 1, arrangement of the light guide light light deflection element emitting side surface 3, 4 and arranged with the light guide 3 in the light exit in 34, the back surface 33 opposed to the light reflective element 5. 导光体3配置成与XY面平行,整体上为矩形板状。 The light guide member 3 is disposed parallel to the XY plane, a rectangular plate shape as a whole. 导光体3有4个侧端面,其中与YZ 面平行的一对侧端面中的至少一个侧端面为光入射面31。 The light guide 3 has four side end faces, wherein at least a side end surface of a light incident surface 31 of side end surface parallel to the YZ plane in. 光入射面31配置成与光源1对置, 光源1发的光从光入射面31入射到导光体3内。 The light incident surface 31 arranged opposite the light source 1, a light source is incident issued from the light incident surface 31 into the light guide 3. 本发明中光源也可配置在例如与光入射面31相对的侧端面32等其他侧端面。 In the present invention, for example, the light source may be disposed in the end face 31 opposite the side of the light incident surface 32 of the other side end face. 导光体3中与光入射面31大致正交的两个主面分别与XY面大致平行,其中任何一个面(图中为上表面)为光出射面33。 3 with the light guide 31 is substantially perpendicular to both main surfaces of the light incident surface is substantially parallel to the XY plane, respectively, any one surface (upper surface in the figure) of the light exit surface 33. 赋予该光出射面33或其背面34的至少一方由粗糙面构成的方向性光出射功能部或由将棱镜条、双凸棱镜条、V状槽等多个棱镜条排列得与光入射面31大致平行而形成的透镜面构成的方向性光出射功能部等,将从光入射面31入射的光引导到导光体3,同吋从光出射面33出射与光入射面31和光出射面33垂直的面(XZ面)内的出射光分布中有方向性的光。 The light 33 imparted directivity or at least one roughened surface consisting of the back surface 34 of the exit surface of the light emitting functional part or a plurality of prisms arranged in strips made from the prismatic bar, lenticular prismatic ridges, V-shaped grooves 31 and the like to the light incident surface the directivity of the lens surface is formed substantially parallel to a light exit functional unit and the like, from the guides incoming light incident surface 31 into the light guide 3, the same inch exit surface 33 from the light 33 exiting the light incident surface emitting surface 31 and the light distribution of light emitted in a vertical plane (XZ plane) of the directional light. 该XZ面内分布的出射光分布峰值方向与光出射面31形成的角度为a。 Angular distribution of the exit surface 31 is formed in the XZ plane direction of the outgoing light and the light distribution peak is a. 该角度a等于10度〜40度为佳,出射光分布的半值宽度等于10度〜40度为佳。 The angle a is preferably equal to 10 degrees ~ 40 degrees, the half value width of the light emission distribution is preferably equal to 10 degrees ~ 40 degrees. 导光体3表面上形成的粗糙面或棱镜条依据IS04287/1 — 1984,平均倾斜角9 a取为0.5 度〜15度的范围,从谋求光出射面33内的亮度均匀性的角度看,属佳。 Rough surface or prismatic ridges 4 formed on the surface of the light guide according to IS04287 / 1 - 1984, average tilt angle 9 a is taken to be the range of 0.5 degrees ~ 15 degrees, from seeking light uniformity angle of brightness in the exit surface 33 to see, It is a good. 平均倾斜角0a范围为1度〜12度较佳,1.5度〜11度的范围更佳。 0a average tilt angle in the range of 1 ° ~ 12 ° preferred, more preferably the range of 1.5 ~ 11 degrees. 该平均倾斜角ea根据导光体3的厚度(t) 和入射光传播方向的长度(L)的比(L/t)设定最佳范围为佳。 The average tilt angle ea preferably set to an optimum range of the thickness (t) of the light guide member 3 and a length (L) in the propagation direction of the incident light ratio (L / t). 也就是说,作为导光体3, L /t采用20〜200左右时,平均倾斜角ea取0.5度〜7.5度为合适,取1度〜5度的范围较佳, 取1.5度〜4度的范围更佳。 That is, as the light guide 3, L / t is about 20~200 employed, the average inclination angle of 0.5 ° ~7.5 ° ea taken as appropriate, to take the range of 1 ~ 5 degrees preferred, of 1.5 ° ~ 4 ° the range is better. 作为导光体3, L/t采用20以下时,平均倾斜角Ga取7度〜12 度为合适,取8度〜11度的范围较佳。 As the light guide 3, L / t using 20 or less, the average inclination angle of 7 degrees ~ 12 degrees Ga take an appropriate range taking 8 ° ~ 11 ° preferred. 遵照IS04287/1 — 1984,用触针式表面粗糙度计测定粗糙面形状,并将测量方向的坐标取为jc,获得斜率函数/(;c)后,可用以下的式(1)和式(2)求出导光体3上形成的粗糙面的平均倾斜角&。 In accordance with IS04287 / 1 - 1984, rough surface roughness measured with a stylus surface shape, and the coordinate measurement direction is taken as JC, obtained slope function / (; c), the following formula can be used (1) and formula ( 2) obtaining the average inclination angle of the light guide is formed on the roughened surface of the body & 3. 式中,Aa是平均倾斜角^j的正切,丄是测量长度。 Wherein, Aa ^ j is the average inclination angle of the tangent, Shang length is measured. <formula>formula see original document page 9</formula>(1)<formula>formula see original document page 10</formula>(2)作为导光体3,其光出射率在0.5%〜5%的范围为合适,在1%〜3%的范围较佳。 <Formula> formula see original document page 9 </ formula> (1) <formula> formula see original document page 10 </ formula> (2) as the light guide 3, the light emission frequency range of 0.5% ~ 5% of It is suitable, preferably in the range of 1% ~ 3%. 这是因为光出射率小于0.5%,则从导光体3出射的光量少,存在得不到足够亮度的趋势,而光出射率大于5%,则在光源1附近出射大量的光,光出射面33内的X方向上光衰减显著,存在光出射面33中亮度均匀性降低的趋势。 This is because the light reflectance of less than 0.5%, from the light guide small amount of light 3 emitted there are not sufficient luminance tendency thereof, and the light reflectance is greater than 5%, in the vicinity of the light source 1 a large amount of light, light an X-direction in the emission surface 33 significantly attenuated glazing, in the presence of the light emitting surface 33 tends to decrease luminance uniformity. 这样,通过将导光体3的光出射率取为0.5%〜5%, 可从导光体3出射方向性高的出射特性的光,并且可在光偏转元件4使该出射方向有效偏转, 从而能提供具有高亮度的面光源元件。 Thus, by the light guide light 3 of reflectance is taken as 0.5% ~ 5%, from the three light with high emission directivity emission properties of the light guide, and may be 4 so that the outgoing direction of light deflection element effective deflection, so that it can provide a surface light source device having high luminance. 该出射特性使光出射面所出射光的出射光分布中峰值光的角度a在10度〜40度的范围,与光入射面和光出射面两者垂直的XZ面中的出射光分布半值宽度为10度〜40度。 The emission characteristics of the light exit surface of the exit light exit width of peak light angle a distribution of light emitted at half maximum in the range of 10 ~ 40 degrees, and the light incident surface and the light of both exit surface perpendicular to the XZ plane of the light distribution 10 degrees ~ 40 degrees. 本发明中,导光体3的光出射率定义如下。 In the present invention, the light exiting the light guide 3 ratio is defined as follows. 设导光体3的厚度(Z方向的尺寸)为t,则光出射面33中光入射面31侧的边缘上的出射光强度(Io)与离开光入射面31侧边缘为L的位置上的出射光强度(I)满足以下式(3)的关系。 Provided the light guide thickness (dimension in the Z direction) 3 is t, the light intensity of outgoing light (Io) on the edge side of the exit surface 33 of the light incident surface 31 and away from 31 the side edges of the light incident surface to the L position outgoing light intensity (I) satisfy the relationship of the following formula (3). <formula>formula see original document page 10</formula> (3)式中,常数a是光出射率,等于光出射面33中与光入射面31正交的X方向上每单位长度(与导光体厚度t相当的长度)从导光体3出射光的比率(%)。 <Formula> formula see original document page 10 </ formula> (3) where the constant A is a light reflectance, is equal to the light exit surface 33 per unit length in the X direction 31 perpendicular to the light incident surface (the light guide length corresponding to thickness t) from the ratio (%) of a light emitting light guide 3. 该光出射率利用分别在纵轴和横轴标出光出射面33出射光强度的对数和(L/t),根据其斜率可求出。 The light reflectivity using vertical and horizontal axes, respectively indicated at the light exit surface 33 of the outgoing light intensity, and the number (L / t), can be obtained according to the slope. 未赋予方向性光出射功能的其他主面上,为了控制与导光体3出射光的光源1平行的面(YZ面)中的方向性,最好形成排有在对光入射面31大致垂直的方向(X方向)延伸的多个棱镜条的透镜面。 Directionality is not given the light exit surface of the other main function, in order to control the light guide 3 and the light source emitting a parallel light plane (YZ plane) of the directivity, is preferably formed with a row in the light incident surface 31 is substantially perpendicular a plurality of prismatic ridges of the lens surface direction (X direction) extends. 图l所示的实施形态中,光出射面33形成粗糙面,背面34形成对光入射面31大致垂直的方向(X方向)上延伸的多个棱镜条排列成的透镜面。 Figure l in the embodiment illustrated, the light exit surface 33 is formed a roughened surface, the back lens surface 34 are formed a plurality of prismatic ridges extending on the light incident surface 31 is substantially perpendicular to the direction (X direction) is arranged. 本发明中,也可与图l所示的形态相反,在光出射面33形成透镜面,而背面34做成粗糙面。 The present invention may also be the opposite to the embodiment shown in Figure l, the lens 33 is formed in the surface of the light exit surface, and rear surface 34 is made a rough surface. 如图1所示,导光体3的背面34或光出射面33形成棱镜条时,作为该棱镜条,可以是在大致X方向延伸的棱镜条双凸棱镜条及V字形槽等,但最好做成YZ方向的剖面为大致三角形的棱镜条。 1, the back surface of the light guide 34 or the light exit surface 333 when the prismatic ridge is formed as strip of the prism, the prismatic ridge may be a lenticular prismatic bars and the like V-shaped groove extending in the direction X substantially, but the most good made YZ direction substantially triangular cross section of the prismatic ridges. 本发明中作为导光体3上形成的棱镜条形成棱镜条时,最好将其顶角做成70度〜150度的范围。 Forming the prismatic ridge of the prism strips of the present invention is formed on the light guide 3, which is preferably made of an apex angle in the range of 70 ° ~ 150 °. 这是因为顶角做成该范围能充分汇聚导光体3的出射光,达到充分提高面光源元件的亮度。 This is because this range is made sufficiently apex converging light exiting the light guide, to sufficiently increase the brightness of the three surface light source device. 艮P,利用将棱镜的顶角做在该范围内,能对包含出射光分布中的峰值光,在与XZ 面垂直的面汇聚的出射光分布半值宽度为35度〜65度的出射光进行出射,能使面光源元件的亮度提高。 Gen P, the prism apex angle use will be within the above range, can containing the peak light emission light distribution, distribution of light emitted half-value width in the plane XZ perpendicular to the plane of convergence of the emitted light 35 degrees ~ 65 degrees for outgoing, can improve the brightness of the surface light source device. 光出射面33上形成棱镜条时,顶角最好做成80度〜100度的范围,背面34上形成棱镜条时,顶角最好做成70度〜80度或100度〜150度的范围。 Forming the prismatic ridge on the light exit surface 33, preferably made of an apex angle range of 80 ° ~ 100 °, back surface 34 is formed on the prism strips, preferably made of an apex angle 70 ° ~ 80 ° ~ 150 degrees or 100 degrees range. 也可利用在导光体内部掺入光扩散性微粒子来赋予方向性光出射功能,代替上述那样在光出射面33或其背面34形成光出射功能部或与该功能部同时使用。 It may also be utilized light diffusing fine particles incorporated within the light guide to the light exit impart directivity function, instead of the light exit surface 33 or back surface 34 or the light exit portion of the functional unit functions in use simultaneously as described above. 作为导光体3,不限于图1所示的形状,可用楔状、船状等各种形状。 As the light guide 3 is not limited to the shape shown in FIG. 1, wedge-like shapes can be used, boat shape. . 光偏转示件4配置在导光体3的光出射面33上。 The light deflector 4 is shown disposed on the light guide 3 is the light exit surface 33. 光偏转元件4的两个主面41和42相互相对,各自处在整体上与XY面平行的位置。 Light deflection element 4 two main faces 41 and 42 opposing each other, are each a whole in the XY plane parallel position. 主面41和42中的一个(位于导光体的光出射面33侧的主面)为入光面41,另一个为出光面42。 And the main surface 42 a (light light guide located in a front side surface 33 of the emitting surface) 41 of the surface 41, the surface 42 to the other. 出光面42做成与导光体3的光出射面33平行的平坦面。 The surface of the light guide 42 made of the light exit surface 33 is parallel to the flat surface 3. 入光面41为多个在Y方向延伸的棱镜条相互平行排列成的棱镜形成面。 41 is a prism surface into a plurality of strips extending in the Y direction are arranged in parallel to each other prism surface is formed. 棱镜形成面可在相邻棱镜条之间设置宽度较窄的平坦部(例如宽度与棱镜条间距大致相同或小于该间距的平坦部),但从提高光利用效率的角度看,最好连续形成棱镜条,不设平坦部。 Prism surface is formed flat may be provided a narrow width portion between the adjacent prismatic ridge (e.g., width and pitch of the prismatic ridge substantially equal to or smaller than the pitch of the flat portion), in view of improving the light utilization efficiency point of view, preferably continuously formed prismatic ridges, no flat portion. 图2是光偏转元件4中入光面41的棱镜条形状的说明图。 FIG 2 is an explanatory view of the light deflection element into the surface shape of the prismatic ridges 41 4. 入光面41的棱镜条形状设定如下。 The prismatic surface 41 is set as a stripe shape. 即,首先,取棱镜条排列间距为P,设定三角形剖面的虚拟棱镜条I。 That is, first, taken prismatic ridge arrangement pitch is P, and sets a virtual prismatic ridges of triangular cross-section I. 设该虚拟棱镜条I的两个棱镜面i一i和i一2形成的角度(即虚拟棱镜顶角)为e 。 The two prism surfaces disposed virtual prismatic ridges and I, i i a i a second angle (i.e., a virtual apex angle prism) is formed e. 将该虚拟棱镜顶角e设定成从导光体3的光出射面33来的光在XZ面内强度分布中的峰值出射光(倾斜角a)入射到虚拟棱镜条I,并且由虚拟棱镜面I一2进行内面全反射后,进到例如出光面42的法线方向。 The virtual prism apex angle e is set to the light from the light guide 3 peak light intensity distribution in the exit plane 33 to the XZ plane of the outgoing light (the inclination angle a) is incident to the prism strip virtual I, and the virtual prism after a 2 plane I totally reflected internally, e.g. proceeds to the normal direction of the surface 42. 虚拟棱镜顶角e在例如从光偏转元件4的出光面42出射的光的峰值出射光朝向出光面42的法线方向附近(例如离开法线方向土10度范围内)时,做成50度〜70度为宜,在55度〜70度的范围较佳,在60度〜70度的范围更佳。 E virtual apex angle prism, for example, light emitted from the peak light toward the light exit surface 4 of the deflection element 42 in the vicinity of the exit surface 42 of the normal direction (e.g., away from the normal direction of the soil within 10 degrees), 50 degrees is made ~ 70 degrees is appropriate, preferably in the range of 55 degrees ~ 70 degrees, more preferably in the range of 60 degrees ~ 70 degrees. 虚拟棱镜条中一个棱镜面的倾斜角(对出光面42 形成的角度)由于要用光偏转元件4使导光体3的出射光偏转到效率高的所希望方向,做成45度以上为宜,47度以上较佳,50度以上更佳。 A virtual prismatic bars prism surface inclination angle (an angle formed on the surface 42) light deflection element 4 due to use of the guide light emitted to the optical deflector 3 in a desired direction, a high efficiency, preferably 45 degrees or more to make , preferably more than 47 degrees, more preferably more than 50 degrees. 接着,以上文那样设定形状的虚拟棱镜条I的形状为基准,决定实际的棱镜条形状,使至少一个棱镜面为凸曲面形状。 Next, the above described shape is set as a virtual I prismatic bar shape as a reference to determine the actual shape of the prism strips, at least one prism surface is a convex curved shape. 具体而言,最好如以下那样决定实际棱镜条的形状。 Specifically, the shape is preferably determined as the actual prismatic strips as follows. 设定从导光体3中光出射面33出射的光的出射光分布峰值出射光(倾斜角a)掠过一次光源1侧相邻虚拟棱镜条的顶部,并入射到虚拟棱镜条I的虚拟光,将该虚拟光通过虚拟棱镜面I一1的位置取为Kl ,到达虚拟棱镜面I一2的位置则为K2。 Setting the light 3 in the light exit surface 33 exiting the light guide emission light distribution peak emitted light (the inclination angle a) the top of the virtual prism component strip passing primary light source 1 side adjacent incident virtual prismatic ridges I Virtual light, light passing through the virtual position of a virtual prism face I 1 is taken as Kl, I reaches the surface position of a virtual prism 2 compared with K2. 通常将比位置K2接近出光面42的整个面做成凸曲面形状为佳。 Closer than the position K2 generally the entire surface of a convex surface 42 is preferably curved shape. 另一方面,比虚拟棱镜条I中棱镜面I一2内部全反射位置K2接近入光面41的位置(即远离出光面42的位置)可为平面状,也可为凸曲面状。 On the other hand, the ratio of the virtual prism face of the prism bar I I 2 a total internal reflection position K2 into the position close to the surface 41 (i.e., a position away from the surface 42) may be planar, may also be a convex curved surface. 任一情况下,做成使位置K2的出光面42侧附近的棱镜面形状伸长的形状为佳,棱镜条顶部与虚拟棱镜条顶部也可不一致。 In either case, K2 is made of the position of the prism surface 42 side surface shape close to a shape preferably elongate, strip virtual prism vertex of the prism strips and the top may be inconsistent. 棱镜条形状最好在比虚拟棱镜条I中棱镜面I一2的内部全反射位置K2接近出光面42的位置上,其至少一部分或全部成为凸曲面形状,具有棱镜面倾斜角大于虚拟棱镜条I中棱镜面I一2倾斜角的倾斜角。 Prismatic bar shape is preferable than a prismatic article I of the virtual I internal total reflection prism surface K2 a position close to the position 2 on the surface 42, at least a portion or all of a convex curved shape, having an inclination angle greater than the virtual prism face of the prism strips I I is a prism surface 2 of the inclinations. z = {(P. tan a. cot[6> / 2] /(tan a + cot[P / 2〗)}. [cot[6> / 2] + {cot 0 /(cot[(9 / 2] — cot 0)}]这相当于图2所示尺寸z (棱镜条顶点与虚拟棱镜面I一2内部反射位置K2间在Z方向的距离)在上式所示值以上的Z方向位置上,实际棱镜面具有大于下式所示虚拟棱镜条I中棱镜面I一2的倾斜角(式中,n是棱镜条的折射率)。歸s[30 / 2] = sin(a — [0 / a])这样设定入光面41的棱镜条形状,能减小从光偏转元件4出射的光的分布角度(半值宽度)。其理由如下。即,比虚拟棱镜条I中棱镜面I一2内部全反射位置接近出光面42的位置上到达的光是从一次光源侧相邻虚拟棱镜条顶部下方以大于a的倾斜角入射的光线的集合。 因此,其分布峰值的方向是大于a的倾斜方向,其内部全反射光的分布峰值方向为从出光面42的法线方向沿内部全反射的虚拟棱镜面的方向倾斜的方向。这种光起的作用是扩展出 z = {(P. tan a. cot [6> / 2] / (tan a + cot [P / 2〗)}. [cot [6> / 2] + {cot 0 / (cot [(9/2 ] - cot 0)}] which corresponds to the position in the Z direction as shown on the above formula size value z (prism vertex of the virtual prism face I a second distance in the Z direction between internal reflection position K2) as shown on FIG. 2 , is greater than the actual virtual prism surface having the prismatic ridges represented by the following formula I, the inclination angle of a prism surface I 2 (wherein, n is the refractive index of the prism strips) normalized s [30/2] = sin (a -. [0 / a]) set such that the prismatic ridges of the shape of the surface 41 can be reduced from the angular distribution of the light emitted light deflection element 4 (half value width) for the following reasons. that is, the ratio of the virtual prism face of the prism section I a total internal reflection I 2 reaches a position close to the light from the primary light source adjacent the lower side of the top bar to the virtual prism set larger than a tilt angle of the incident beam. Thus the position of the light receiving surface 42, which direction is larger than the peak of the distribution a tilt direction, the direction of the peak of the distribution of the internal total reflection of light from the inclined surface 42 in a direction normal to the direction of a virtual internal total reflection prism surface direction of this light is the role of an extension 面42的出射光的角度分布。因此,为了将光量集中到特定方向出射,在比虚拟棱镜条I中棱镜面I一2内部全反射位置K2接近出光面42的位置,对其至少一部分,使实际棱镜条中棱镜面的倾斜角大于相应区域棱镜面的倾斜角,从而能修正成使该区域中实际内部全反射光的行进方向移动到比虚拟棱镜面上的反射光更接近出光面42法线方向的部位,可提高亮度和集中视野。可在比虚拟棱镜条I中棱镜面I一2内部全反射位置K2接近出光面42的整个位置形成上述凸曲面形状,而在比内部全反射面K2远离出光面42的位置为虚拟棱镜条中棱镜面I一2 的原状,也可包含比内部全反射位置K2远离出光面42的位置在内,使整个棱镜面为凸曲面形状。作为这种凸曲面形状,可例举出与虚拟棱镜条至少底部共同的曲率半径为r的凸圆柱面形状。这里,作为用间距P归一化的曲率半径r的值 Outgoing light angle surface 42 of the distribution. Thus, to the amount of light focused on a specific direction out of the exit, in the ratio I prism faces virtual prismatic ridge a second internal total reflection position K2 I close position surface 42, at least a portion thereof, so that the actual inclination angle of the prismatic ridges of the prism surface area greater than a corresponding angle of inclination of the prism surface, so that the area can be corrected so that the actual internal total reflection of light traveling direction of the reflected light moves to the virtual prism surface closer to the surface 42 method bit line direction, can improve the brightness and focus field of view may be close to the position of the entire surface 42 of the convex curved shape is formed in a plane I I 2 prism total internal reflection prism position K2 than the virtual item, and in the ratio of total internal reflection surface K2 surface 42 away from the position of the virtual prism face of the prism undisturbed a strip 2 is I, may also include internal reflection position than the position K2 away from the inner surface 42, the entire surface of the prism in a convex curved shape. as such convex curved shape, may include a convex cylindrical surface shape at least the prismatic ridge of the virtual common radius r of curvature of the bottom of here, as normalized by the radius of curvature r of the pitch P value (r/P),其范围取2〜80为宜,7〜30的范围较佳,7.5〜20的范围更佳,8〜15的范围尤佳。这是因为将r/P取为该范围,能使从光偏转元件4中出光面42出射的出射光分布的半值宽度足够窄,可充分提高光源装置的亮度。 例如,棱镜条的间距为40nm〜60pm时,曲率半径r取250pm〜3000 的范围为宜,取350 pm〜1000阿的范围较佳,取350pm〜700 pm的范围更佳。作为光偏转元件4中各棱镜条的凸曲面形状,虚拟棱镜条棱镜面和凸曲面形状棱镜面的最大距离d与上述棱镜条排列间距P的比(d/P)为0.05%〜5%范围的这种比较缓变的曲面形状为宜,0.1%〜3%的范围较佳,0.2%〜2%的范围更佳,0.7%〜1.5%的范围尤佳。 (R / P), which range is appropriate to take 2~80, 7~30 preferred range, more preferably in the range of 7.5~20, plus a range of 8~15. This is because r / P to take this range , from the surface enables the optical deflector element 442 or exit the half width of the light distribution is sufficiently narrow, can sufficiently increase the brightness of the light source device. For example, when the pitch of the prismatic ridge 40nm~60pm, the radius of curvature r takes 250pm~ preferably the range of 3000, taking 350 pm~1000 a preferred range, better take 350pm~700 pm range as light deflection element 4 convex curved shape of each prism strip, and the virtual prism face of the prism strips convex curved shape the maximum distance d of the prism surface arrangement pitch P of the prism strip ratio (d / P) is 0.05% ~ 5% of such comparison graded preferably curved shape, the range of 0.1% ~ 3% preferred, 0.2 % ~ 2% of range better, the range of plus 0.7% ~ 1.5%. 这是因为d/P超过5%,则光偏转元件4的聚光效应受损,存在产生光发散的趋势,趋向于不能使光偏转元件4中出光面出射的出射光分布半值宽度充分縮小。 This is because d / P exceeds 5%, the light deflecting damaged converging effect element 4, there is a tendency to produce diverging light, tend to half width of light distribution emitted not allow light deflection element 4 in the surface emission is sufficiently narrow . 反之,d/P不到0.05%,则光偏转元件4的聚光效应不充分,趋向于不能使光偏转元件4中出光面出射的出射光分布半值宽度充分縮小。 Conversely, d / P is less than 0.05%, the effect of converging the light deflecting element 4 is insufficient, and tend not to deflect light exit surface element 4 in the half width of the emission distribution of light emitted reduced sufficiently. 在本发明中,光偏转元件4的各棱镜条的凸曲面形状不限于如上所述的曲率半径r的剖面圆弧状,如果是在上述那样的d/p的范围内,也可以是非球面状的凸曲面形状。 In the present invention, the light deflecting element convex curved surface of each prism strip 4 is not limited to the cross-sectional radius of curvature r of the circular arc shape as described above, if it is within the scope of the above-described d / p, the aspherical shape can be convex curved shape. 本发明中,上述那样的凸曲面形状的棱镜面至少形成在远离一次光源1侧的面为佳。 In the present invention, the prism surface of the convex curved shape as described above is formed at least one side face remote from a light source is preferable. 这样,在导光体3的端面32也配置一次光源时,能充分减小从光偏转元件4出射的光的分布角度。 Thus, when the end face 32 of the light guide 3 is also arranged a light source, the angle distribution can be sufficiently reduced from the light deflecting element 4 is emitted. 凸曲面形状的棱镜面当例如导光体3传播的光在与光入射面31相反侧的端面32进行反射而返回的比例较大时,接近一次光源1侧的棱镜面也做成凸曲面形状较佳。 Prism surface convex curved shape, for example, when the proportion of large prism surface reflecting light to the light incident surface 31 opposite to end surface 32 side of the returned light guide 3 propagation, a side near the primary light source is also a convex curved shape better. 将接近一次光源1侧的棱镜面做成对出光面42的法线方向与虚拟棱镜面I一2对应的实际棱镜面对称的形状尤佳。 Near the primary light source 1 side of the prism surface is made of a I 2 corresponding to the actual prism surface normal direction 42 of the virtual prism surface symmetrical shape is preferred. 反之,凸曲面形状的棱镜面在例如导光体3传播的光在与光入射面31相反侧的端面32进行反射而返回的比例较小时,接近一次光源1侧的棱镜面也可为平面。 On the contrary, the prism surface of the convex curved shape at the time of, for example, a smaller proportion of light reflected to the light incident surface 31 opposite to end surface 32 side is returned to the light guide 3 propagates close to a light source prism surface side may be flat. 为了抑制对导光体3装光偏转元件4时产生卡阻现象而需要使棱镜条顶部呈尖形(明显地形成顶部前端的棱边)时,使接近一次光源1侧的棱镜面为平面,与两个棱镜面均为凸面时相比,能较正确地做成用于形成棱镜条的成型模构件中形状复制面的形状,棱镜条顶部容易形成尖状,因而较佳。 4:03 order to suppress the light deflecting means to generate jamming element of the light guide is necessary that the top was tapered prismatic ridge (apparently formed on the top front edges), the proximity of the primary light source 1 side of the prism surface is flat, when compared with the two prism surfaces are convex, can more accurately be made for shaping die member is formed in the shape of the prismatic ridge of the transfer surface, the top bar is easy to form a prism-shaped tip, and thus preferred.本发明的光偏转元件中,为了在精确制作所希望棱镜形状,取得稳定光学性能的同时, 抑制组装作业时和作为面光源装置使用时的棱镜顶部磨损和变形,可在棱镜条的顶部形成平坦部或曲面部。这时,从抑制产生作为面光源装置时亮度降低和卡阻现象造成的亮度不均匀图案的角度看,棱镜顶部所形成平坦部或曲面部的宽度取3 pm以下为宜,取2 pm以下较佳, 取1 pm以下更佳。本发明中,为了提高质量,可调整作为面光源装置时的视野角,或者在光偏转元件的出光面侧形成光扩散面,使棱镜条中含有光扩散剂。作为光扩散层,其形成方法可为:在光偏转元件的出光面侧装光扩散板,或者在出光面侧与光偏转元件合为一体地形成光扩散层。这时,为了尽可能不妨碍光偏转元件视野窄带来的亮度提高效果,最好形成异向扩散性光扩散层,使光在所希望的方向扩散。作为分散在棱镜条中的光扩散剂,可用折射率与棱镜条中不同的透明微粒子。这时,选择光扩散剂的含有量、粒径、折射率等,以便尽可能不妨碍光偏转元件使视野窄带来的亮度提高效果。这样。在导光体3的光出射面33上装上述那样的光偏转元件4,使其棱镜条形成面成为入光面侧,能进一步縮小导光体3中光出射面33出射的方向性出射光在XZ面的出射光分布, 可达到作为光源装置时亮度高、视野窄。来自这种光偏转元件4的出射光在XZ面内的出射光分布,其半值宽度在5度〜25度的范围为宜,10度〜20度的范围较佳,12度〜18度的范围更佳。这是因为如果该半值宽度为5度以上,造成视野极端窄,会失去图像等的难见度, 而25度以下,则能达到提高亮度和縮小视野。本发明中光偏转元件4的縮小视野影响导光体3中光出射面33的出射光分布(XZ面内) 的扩展程度(半值宽度),因而光偏转元件4中出光面42的出射光分布半值宽度A相对于导光体3中光出射面33的出射光分布半值宽度B的比率随该半值宽度B变化。例如,该半值宽度B不到26度时,半值宽度A在半值宽度B的30X〜95X的范围为宜,在半值宽度B 的30%〜80%的范围较佳,在半值宽度B的30X〜70X的范围更佳。该半值宽度B为26度以上时,半值宽度A在半值宽度B的30X〜80X的范围为宜,在半值宽度B的30%〜70% 的范围较佳,在半值宽度8的30%〜60%的范围更佳。尤其是,该半值宽度B为26度〜36 度时,半值宽度A在半值宽度B的30X〜80X的范围为宜,在半值宽度8的30%〜70%的范围较佳,在半值宽度B的30X〜60X的范围更佳。来自导光体3的出射光分布的半值宽度B超过36度时,半值宽度A在半值宽度B的30%〜70%的范围为宜,在半值宽度B的30 %〜60%的范围较佳,在半值宽度B的30X〜50X的范围更佳。这样,本发明中,导光体3的出射光分布半值宽度越大,视野縮小的效果越大,因而在縮小视野的效率方面,将光偏转元件与出射光分布半值宽度B为26度以上的导光体组合使用为宜,该半值宽度B超过36度的导光体较佳。导光体3的出射光分布半值宽度小时,縮小视野的效果小,但导光体3的出射光分布半值宽度越小,越能实现高亮度,因而在提高亮度方面,将光偏转元件与出射光分布半值宽度B不到26度的导光体组合使用为佳。一次光源1是在Y方向延伸的线状光源,作为该一次光源1,可用例如荧光灯或冷阴极管。本发明中,作为一次光源l,不限于线状光源,可用LED光源、卣素灯、金属卣化物灯等点光源。尤其用于便携电话机和便携信息终端设备等的屏幕尺寸较小的显示装置时,用LED 等小型点光源为佳, 一次光源1不仅如图1所示设置在导光体3的一个侧端面,而且根据需要,还可以进一步设置在相对的另一侧端面。光源反射器2是将一次光源1的光低损耗地引导到导光体3的部件。作为其材料,可用例如表面具有金属蒸镀反射层的塑料膜。如图中所示,光源反射器2从光反射元件5的端缘部外表面经一次光源1的外表面巻绕到光偏转元件4的出光面端缘部。另外,光源反射器2 也可避开光偏转元件4,从光反射元件5的端缘部外表面经一次光源1的外表面巻绕到导光体3的出光面端缘部。也可在导光体3的侧端面31以外的侧端面添加与这种光源反射器2相同的反射构件。作为光反射元件5,可用例如表面具有金属蒸镀反射层的塑料板。本发明中,作为光反射元件5, 可以是利用金属蒸镀等在导光体3的背面34形成的光反射层等,以代替反射板。本发明的导光体3和光偏转元件4可由光透射率高的合成树脂组成。作为这种合成树脂, 其例子有甲基丙烯树脂、丙烯树脂、聚碳酸酯类树脂、聚酯树脂、聚氯乙烯类树脂。尤其甲基丙烯树脂,其光透射率高,耐热性、力学特性、成形加工性优良,最合适。作为这种甲基丙烯树脂,是以甲基丙烯酸甲酯为主成分的树脂,甲基丙烯酸甲酯达80重量%以上的为佳。在形成导光体3和光偏转元件4中粗糙面的表面结构或棱镜条等的表面结构时,可以用具有所需表面结构的模具以热压形成透明合成树脂板,也可用丝网印刷、挤压成形和注塑成形等, 在成形的同时赋予形状。又能用热固化或光固化树脂等,形成结构面。还可在聚酯类树脂、 丙烯类树脂、聚碳酸酯类树脂、聚氯乙烯类树脂、聚甲基丙烯酰亚胺类树脂等组成的透明膜或板等透明基材上,在表面形成活性能量线固化型树脂构成的粗糙面结构或棱镜条排列结构, 也可用粘接、融接等方法,在个体透明基材上将这种薄板接合为一体。作为活性能量线固硬化型树脂,可用多官能(甲基)丙烯酸化合物、聚乙烯化合物、(甲基)丙烯酸酯类、烯丙化合物、(甲基)丙烯酸的金属盐化合物等。在以上那样的一次光源l、光源反射器2、导光体3、光偏转元件4和光反射元件5组成的面光源装置的发光面(光偏转元件4的出光面42)上,配置液晶显示元件,从而构成液晶显示装置。观看者从图1的上方通过液晶显示元件观看液晶显示装置。本发明中,由于能从面光源装置将分布足够窄的光入射到液晶显示元件,液晶显示元件中无灰度反相等,能得到亮度、色相均匀性良好的图像显示,同时能得到集中在所需方向的光照射,可提高对该方向照明的一次光源所发光量的利用率。图3是示出本发明的面光源装置另一实施形态的示意立体图。此实施形态与对上述图1、 图2说明的实施形态的不同点仅在于:导光体3的背面34为平坦面,形成从光入射端面31到相反侧端面32的方向上厚度逐渐减小的楔状,并且一次光源1附近配置防止亮光和暗光用的遮光件6。以上的实施形态对面光源装置进行了说明,但本发明也可用于Y方向尺寸为例如导光体3厚度的5倍以下的X方向细长的棒状光源装置。这时,作为一次光源l,可用LED等大致点状的光源装置。下面,用实施例具体说明本发明。以下的实施例中,各种性能的测量进行如下。面光源元件法线亮度、发光强度半值宽度的测量将冷阴极管用作光源,对逆变器(HARISON公司制造的HIU—742A)施加直流12V,以高频使其点亮。亮度方面,将面光源装置或导光体表面按20mm的正方形划分成3x5个,求各正方形法线方向亮度值对15的平均值。发光强度半值宽度方面,在面光源装置或导光体的表面固定具有(Hmm的针孔的黑纸,使针孔位于表面的中央,并且调整距离,使亮度计测量的圆为8mm〜9mm,又进行调节,使测角器的旋转轴在冷阴极管纵轴的垂直方向和平行方向以针孔为中心进行旋转。使旋转轴分别在各方向以0.5度的间隔从+80度旋转到一80度,同时用亮度计测量出射光的发光强度分布,求出法线方向的亮度、发光强度分布的半值宽度(半峰值分布的扩展角)。平均倾斜角(ea)的测量遵照IS04287 / 1 — 1987,以触针采用010—2528 (R为1拜且55度的圆锥形金刚石) 的触针式表面粗糙度计(东京精器株式会社制造的SAHCOM570A),用0.0 3mm/秒的驱动速度测量粗糙面的表面粗糙度。从该测量所得的记录曲线以平均值的差校正其斜率,根据上述式(1)和式(2)计算并求出平均倾斜角。[实施例1 ]借助用丙烯树脂(三菱REYON株式会社制造的ACRYPETVH5#000)进行注塑成形, 制作一个面为粗糙面(平均倾斜角3.0度)的导光板。该导光板形成195mmx253mm、厚度3mm至lmm的楔板状。在该导光体的镜面侧用丙烯类紫外线固化树脂形成相连并排着的顶角140度、间隔50 iam的棱镜条的棱镜层,使其与导光体中长度为195mm的边(短边)平行。配置冷阴极管,沿其长边用光源反射器(丽光公司制造的银反射膜)覆盖,并且使该冷阴极管与导光体中长度为53mm的边(长边)相应的一个侧端面(厚度3mm侧的端面)对置。再在另一侧端面粘贴光扩散反射膜(TORAY公司制造的E60),并且在棱镜条阵列(背面) 配置反射板。将以上的结构体装入壳体。该导光体的光出射率为1 .5%,出射光的发光强度分布最大峰值相对于光出射面法线方向为70度,半值宽度(半值宽度B)为24.5度。另一方面,制作棱镜板,该 在厚度50 pm的聚酯膜的一个表面用折射率1.5064的丙烯类紫外线固化树脂形成相连并排着多个棱镜条的棱镜条形成面,这些棱镜条的两个棱镜面的整个面均分别为表l所示曲率半径的凸曲面形状,并且棱镜条的间距为50 pm。这时,作为虚拟棱镜条,设定间距50pm,且顶角65.4度的等腰三角形剖面的棱镜条,使棱镜板的出射光在其出光面的法线方向。装配所得的各棱镜板,使棱镜条形成面朝向上述导光体的光出射面侧,并且棱镜条的棱线与导光体的光入射面平行。求出以上那样制作的面光源装置的峰值亮度的强度比和与冷阴极管垂直方向面内的出射光分布半值宽度(半值宽度A),其结果示于表l。 [比较例1〗除棱镜板的形成有棱镜条的棱镜面为平面外,与实施例1相同,制作棱镜板,该板在一个表面形成间距为50 pm,且顶角65.4度的等腰三角形剖面的棱镜条。装配该棱镜板,使棱镜条形成面朝向实施例1中所得导光体的光出射面侧,并且棱镜条的棱线与导光体的光入射面平行。求出以上那样制作的面光源装置的峰值亮度的强度比和与冷阴极管垂直方向面内的出射光分布半值宽度(半值宽度A),其结果示于表l。 <table>table see original document page 17</column></row> <table><table>table see original document page 18</column></row> <table>〖实施例2]用丙烯树脂(三菱REYON株式会社制造的ACRYPETVH5弁000)进行注塑成形,制作一个面为粗糙面(平均倾斜角8.0度)的导光板。该导光板形成195mmx253mm、厚度3mm 至lmm的楔板状。在该导光体的镜面侧用丙烯类紫外线固化树脂形成相连并排着顶角140 度、间距50 ^m的棱镜条的棱镜层,使其与导光体中长度为195mm的边(短边)平行。配置冷阴极管,沿其长边用光源反射器(丽光公司制造的银反射膜)覆盖,并且使该冷阴极管与导光体中长度为53mm的边(长边)相应的一个侧端面(厚度3rnm侧的端面)对置。再在另一侧端面粘贴光扩散反射膜(TORE公司制造的E60),并且在棱镜条阵列(背面)配置反射板。将以上的结构体装入壳体。该导光体的光出射率为4.5%,出射光的发光强度分布最大峰值对光出射面法线方向为61度,半值宽度(半值宽度B)为39度。另一方面,制作棱镜板,该板在厚度50 pm的聚酯膜的一个表面用折射率1.5064的丙烯类紫外线固化树脂形成相连并排着多个棱镜条的棱镜条形成面,这些棱镜条的两个棱镜面的整个面均分别为表2所示曲率半径的凸曲面形状,并且棱镜条的间距为50|im。这时,作为虚拟棱镜条,设定间距5(Him,且顶角65.4度的等腰三角形剖面的棱镜条,使棱镜板的出射光在其出光面的法线方向。装配所得的各棱镜板,使棱镜条形成面朝向上述导光体的光出射面侧,并且棱镜条的棱线与导光体的光入射面平行。求出以上那样制作的面光源装置的峰值亮度的强度比和冷阴极管垂直方向面内的出射光分布半值宽度(半值宽度A),其结果示于表2。[比较例2]除棱镜板的形成有棱镜条的棱镜面为平面外,与实施例1相同,制作棱镜板,该板在一个表面形成间距为50^m,且顶角65.4度的等腰三角形剖面的棱镜条。装配该棱镜板,使棱镜条形成面朝向实施例2中所得导光体的光出射面侧,并且棱镜条的棱线与导光体的光入射面平行。求出以上那样制作的面光源装置的峰值亮度的强度比和与冷阴极管垂直方向面内的出射光分布半值宽度(半值宽度A),其结果示于表2。 <table>table see original document page 18</column></row> <table><table>table see original document page 19</column></row> <table>生产上的可用性如以上所说明,根据本发明,以按照导光体峰值出射光倾斜角设定的虚拟棱镜条形状为基准,将光偏转元件的入光面上形成的棱镜条的至少一个棱镜面做成凸面形状,因而能提供使一次光源发的光向所需观看方向集中出射的效率(一次光源的光量利用率)得到提高,而且光偏转元件出光面为平坦面简化得便于成形的光源装置。尤其在本发明中,对光偏转元件中入光面的棱镜面倾斜角做成在比根据导光体峰值出射光倾斜角设定的虚拟棱镜条的位置接近出光面的位置,具有大于虚拟棱镜面倾斜角的倾斜角的凸曲面形状,因而能提供提高将一次光源发的光集中到所需观看方向出射的效率(一次光源的光量利用率) 且光偏转元件出光面按平坦面简化得便于成形的光源装置。

Claims (6)

1. 一种光源装置,配备一次光源、具有入射该一次光源所发光的光入射面和引导入射光并将其出射的光出射面的导光体、以及与该导光体的光出射面相邻配置的光偏转元件,该光源装置为侧照式,其特征在于, 该光偏转元件具有所处位置与所述导光体的光出射面对置的入光面和处于其相反侧的出光面,所述入光面上形成有相互并列配置的多个棱镜条,该棱镜条具有两个棱镜面,至少远离所述一次光源侧的棱镜面的至少一部分为凸曲面形状,该凸曲面形状的棱镜面与连接该棱镜面的顶部和底部的平面之间的最大距离d与所述棱镜条的排列间距P的比为0.2%~2%, 所述光偏转元件的各棱镜条的虚拟棱镜顶角为50度~70度,所述虚拟棱镜顶角是两个连接所述棱镜面的顶部和底部的平面之间的夹角。 1. A light source device equipped with a light source having a light source incident on the light incident surface and emitting incident light and guiding the emitted light exit surface of the light guide, the light guide and the light exit surface o light deflection element arranged in the light source device is edge-lit, characterized in that the light deflection element having a light guide location of the light exit face opposing the light incident surface and in the opposite side of the light surface, the light-receiving surface is formed with a plurality of prisms arranged in parallel to each other strips, the prismatic ridge having two prism surfaces, away from the at least one prism surface at least a portion of the light source side is a convex curved shape, the convex curved shape prism surface attached to the largest distance between the planar top and bottom surface d of the prism of the prism strips and the arrangement pitch P ratio of 0.2% to 2%, of each prism of the prism strips virtual light deflecting element an apex angle of 50 degrees to 70 degrees, the angle between the plane of the virtual apex angle prism is connected to two top and bottom surface of the prism.
2. 如权利要求1所述的光源装置,其特征在于,所述光偏转元件的各棱镜条的凸曲面形状是其曲率半径r相对所述棱镜条排列间距P之比为2〜30的大致凸圆柱面形状。 The light source apparatus according to claim 1, characterized in that the convex curved shape of each prism strip is the light deflection member relative to a radius of curvature r of the arrangement pitch P of the prismatic ridge substantially ratio of 2~30 convex cylindrical surface shape.
3. 如权利要求1所述的光源装置,其特征在于,所述光偏转元件的各棱镜条的邻近一次光源侧的棱镜面,连接该棱镜面的顶部和底部的平面的倾斜角为大于等于45度。 The light source apparatus according to claim 1, wherein the optical surface of each prism of the prism element adjacent the strip deflected primary light source side, the inclination angle of a plane connecting the top and bottom surfaces of the prism is greater than or equal 45 degree.
4. 如权利要求1〜3中任一项权利要求所述的光源装置,其特征在于,所述导光体的光出射面和/或其相反侧的背面是具有方向性光出射功能的面。 The light source device according to claim any one of claims 1 ~ 3, wherein the back surface and the light exit surface of the light / or an opposite side of the guide is a light exit surface having a directivity function .
5. 如权利要求4所述的光源装置,其特征在于,所述具有方向性光出射功能的面的平均倾斜角为0.5度〜15度。 The light source apparatus according to claim 4, wherein said surface has an average inclination angle of the directivity of the light exit function is 0.5 degrees ~ 15 degrees.
6. 如权利要求4所述的光源装置,其特征在于,所述具有方向性光出射功能的面是粗糙面或多个棱镜条排列而成的面。 The light source apparatus according to claim 4, characterized in that said directional light exit surface is a function of the roughened surface or a plurality of prisms arrayed strip surface.
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EP0802446A1 (en) 1995-11-06 1997-10-22 Seiko Epson Corporation Illuminator, liquid crystal display using the illuminator and electronic device
CN1212042A (en) 1996-02-01 1999-03-24 三菱丽阳株式会社 Surface light source element and liquid crystal device and sign display device using same

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EP0802446A1 (en) 1995-11-06 1997-10-22 Seiko Epson Corporation Illuminator, liquid crystal display using the illuminator and electronic device
CN1212042A (en) 1996-02-01 1999-03-24 三菱丽阳株式会社 Surface light source element and liquid crystal device and sign display device using same

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