CN100392495C - Surface light source device and light guide plate - Google Patents

Surface light source device and light guide plate Download PDF

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Publication number
CN100392495C
CN100392495C CN 200510088209 CN200510088209A CN100392495C CN 100392495 C CN100392495 C CN 100392495C CN 200510088209 CN200510088209 CN 200510088209 CN 200510088209 A CN200510088209 A CN 200510088209A CN 100392495 C CN100392495 C CN 100392495C
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surface
guide plate
light guide
side
light
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CN 200510088209
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Chinese (zh)
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CN1721953A (en
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大川真吾
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株式会社恩普乐
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Priority to JP2001-228670 priority
Priority to JP2002-50858 priority
Priority to JP2002-116329 priority
Priority to JP2002-190053 priority
Priority to CN02803216.0 priority
Application filed by 株式会社恩普乐 filed Critical 株式会社恩普乐
Publication of CN1721953A publication Critical patent/CN1721953A/en
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Abstract

配置作为光源的LED(5)、使其对向导光板(3)的入射面(4),该LED(5)的光从导光板(3)的入射面(4)射入导光板(3)内部后在导光板(3)内部进行传播,在这种传播过程中,对于射出面(6)的入射角小于临界角的光,从导光板(3)的射出面(6)射出。 As the LED light source configuration (5), so that the incident surface of the light guide plate (3) (4), the LED (5) of the light (4) incident on the light guide plate (3) from the light guide plate (3) of the incident surface propagated through the light guide plate (3) after the inside, in such a communication process, for the emission surface (6) is an incident angle smaller than the critical angle of the light, from the light guide plate (3) of the emission surface (6) is emitted. 而且在导光板(3)的射出面(6)及其相反一侧面(10)的至少一方上,沿入射面(4)平行形成多条从入射面(4)附近向远离的方向延伸设置的棱形凸起(12)。 Also on one side, along the incident surface (4) forming a plurality of parallel extending from the vicinity of the incident surface (4) at least in a direction away from the light guide plate (3) of the emission surface (6) and the opposite side surface a (10) prismatic projections (12). 此外,形成棱形凸起(12)侧面侧部分(10b)、使越靠近入射面(4)凸起高度逐渐降低。 Further, a prismatic projection (12) side surface portion (10B), so that (4) the height of the projection gradually decreases the closer to the incident surface. 采用这种构成,在将LED作为光源使用的场合,也能抑制导光板入射面附近异常发光,并谋得射出光亮度均匀。 With this configuration, in the case where the LED as the light source, the light guide plate can be suppressed near the incident surface of the light emitting abnormality and gained uniform brightness is emitted.

Description

面光源装置及导光板 A light guide plate and surface light source device

本申请是国际申请日为2002年7月26日、国际申请号为PCT/JP02/07594、 中国国家申请日为2003年6月16日、申请号为02803216.0、发明名称为"面光源装置、图象显示装置及导光板"的专利申请的分案申请。 This application is the international filing date, 2002 July 26, International Application No. PCT / JP02 / 07594, China National filed, 2003 June 16, Application No. 02803216.0, entitled "surface light source device, and FIG. image display means and the light guide plate divisional application "patent applications.

技术领域 FIELD

本发明涉及在手机、携带型电子终端装置、电子记事本、汽车驾驶导向系统、数码相机、VTR装置、个人电脑、电视、各种办公用设备中,作为面状照明液晶显示屏(被照明部件)的后照光等使用的面光源装置及具备这种面光源装置的图象显示装置。 The present invention relates to a mobile phone, portable electronic terminal device, an electronic organizer, car navigation systems, digital cameras, the VTR device, a personal computer, a television, various office equipment, as the planar lighting LCD panel (member to be illuminated ) of the surface light source device using the back light, etc., and this surface light source device includes an image display device. 此外,还涉及这些面光源装置及图象显示装置中使用的 In addition, also relates to these surface light source device and an image display apparatus used in

导光板。 The light guide plate.

背景技术 Background technique

例如,手机、携带型电子终端装置等中使用的面光源装置,在导光板的侧面(入射面) 一侧配置作为光源的荧光灯,通过导光板将该荧光灯的光呈面状射出,使其射出光照射液晶显示屏。 For example, surface light source device used in mobile phones, portable electronic terminal devices, in the light guide plate side surface (incidence surface) disposed on the side of the fluorescent lamp as a light source, the light emitted by the fluorescent light guide plate were planar, so that it emits LCD light irradiation. 而且,这种面光源装置和液晶显示屏一起构成图象显示装置。 Moreover, this surface light source device and a liquid crystal display device together constitute an image display. 此外,为了谋求提高面光源装置的亮度等,就一直在导光板上作各种努力,其中之一是本专利申请人提出的形成多条对着导光板的入射面并向实质上正交方向延伸的棱形凸起的方案(例如,参照特开平10 — 268138 号公报)。 Further, in order to seek to improve the brightness of the surface light source device, various efforts have been made in the light guide plate, one of which is proposed by the applicant of the present patent are formed a plurality of front incident surface of the light guide plate and substantially orthogonal direction prismatic projections extending programs (e.g., see JP 10 - Publication No. 268,138).

可是,近年来,为了使用户使用方便,手机、携带型电子终端装置等在谋求电话机主体和装置主体薄、轻的同时,试图尽可能将显示画面做大。 However, in recent years, in order to make user-friendliness, mobile phones, portable electronic terminal devices while seeking the telephone apparatus main body and a thin, light, trying as much as possible to enlarge a display screen. 在这样的技术背景的基础上,使用LED作点光源代替荧光灯,縮小光源的收容空间, 研制面光源装置,以便只削减光源的收容空间谋求显示画面的大型化。 On the basis of such a technical background, the use of LED as a point light source instead of a fluorescent lamp, the light source accommodating space narrowing, development of surface light source device, so that only the light source housing space to seek to reduce the size of the display screen. 使用这种面光源装置的手机、携带型电子终端装置等已经上市。 Mobile such surface light source device, portable electronic terminal devices already on the market.

图40〜图41示出在形成上述多条棱状凸起的导光板上将LED100作为光源使用的面光源装置101的例子。 FIG 40~ FIG. 41 shows an example of forming the plurality of rib-like projections on the light guide plate as a surface light source device LED100 light source 101. 如这些图所示,面光源装置101配置着多个LEDIOO,使得对向导光板102的侧面(入射面)103。 As shown in these figures, the surface light source device 101 is configured with a plurality of LEDIOO, such that the side surface of the light guide plate 102 (incidence surface) 103. 而且,这种面光源装置 Furthermore, such a surface light source apparatus

101在背面(和射出面106相反一侧的面)105上形成多条结导光板102的入射面103向实质上正交的方向延伸的棱形凸起104,在这种棱形凸起104上将导光板102内部传播的光L反射,将导光板102的射出面106射出的光会聚于射出面106的法线方向附近,提高照明亮度(参照图42)。 Prism 101 on the back surface (surface opposite to and the exit face 106) a plurality of junction 105 is formed an incident surface 102 of the guide plate 103 extending in the direction substantially orthogonal to the projection 104, in which the prismatic protrusion 104 the light L reflected on the light guide plate 102 propagates inside the light guide plate 102 of the exit surface 106 converges the light emitted in the vicinity of the normal direction of the emission surface 106, to improve the brightness of illumination (see FIG. 42).

但是,作为用于这种导光板102的光源,就原封不动地将荧光灯置换LEDIOO,如图40所示,在从射出面106侧观察导光板102时,在入射面103 附近,几乎与LED100对应产生V字形的异常发光(亮线)H,有时显著损坏照明的品质。 However, as the light source for such a light guide plate 102, it is intact fluorescent lamp replacement LEDIOO, 40, when viewed from the emitting surface 106 side of the light guide plate 102, in the vicinity of the incident surface 103, almost LED100 corresponding to the V-shaped abnormal emission (bright lines) H, may significantly damage the quality of illumination. 可以认为这是由于LED100和荧光灯具有不同的指向性,及导光板102内部传播的光L在位于入射面附近的棱形凸起104上反射向着射出面106 的特定方向射出的缘故。 This is considered due to the LED100 and fluorescent lamps having different directivity, and the light L propagated inside the light guide plate 102 toward the reflective protrusion 104 emission surface 106 in a particular direction because of the emitted near the incident surface of the prism.

此外,如图43〜图44所示,用于手机、携带型电子终端装置等的面光源装置在导光板102的侧面(入射面103) —侧配置作为棒状光源的荧光灯IOOA, 通过导光板102该荧光灯100A的光呈面状射出,就变成用该射出光照射图中未示出的液晶显示屏。 Further, as shown in FIG. 43~ 44, a mobile phone, portable electronic terminal device and the like in the surface light source device side (incidence surface 103) of the light guide plate 102 - arranged side fluorescent IOOA as rod-shaped light by the light guide plate 102 the light of the fluorescent lamp 100A emitting planar state, it becomes irradiated with the light emitted from the liquid crystal is not shown in FIG display. 而且,这种面光源装置101和配置成与导光板102的射出面106对向的图中未示出的液晶显示屏一起构成图象显示装置。 Further, 106 pairs of the exit surface 102 of FIG such surface light source device 101 and a light guide plate arranged in the liquid crystal display screen (not shown) together constitute the image display apparatus. 此外,这种面光源装置101为了提高照明光的亮度, 一直对导光板作各种努力,例如在导光板102的里面105上形成多条对于导光板102的入射面103实质上正交的方向延伸的棱形凸起,利用该棱形凸起104的光反射功能以图提高照明光的亮度(例如:特开平10 — 268138号公报)。 Furthermore, such a surface light source device 101 to improve the brightness of the illumination light, light guide plate that various efforts have been, for example, a direction substantially perpendicular to the incident surface 103 of the light guide plate 102 on which a plurality of the light guide plate 102, 105 prismatic projections extending by projection 104 of the prismatic light reflecting function in order to improve FIG illumination light brightness (for example: Japanese Patent Publication 10 - Publication No. 268,138).

但是,使用荧光灯IOOA作为这种线状光源的面光源装置101,因位于荧光灯100A两端的电极部分不发光,所以在结构上存在导光板102的入射面103 侧的两端比其它部分容易出现暗的部分(图43上用斜线表示低亮度部分110) 的问题。 However, a fluorescent lamp as a surface light source device IOOA 101 such linear light sources, due to the electrode portions at both ends of the fluorescent lamp 100A do not emit light, there is the structure at both ends of the light guide plate 103 side of the incident surface 102 is prone to be darker than the other portions part (FIG. 43 showing the low-luminance part 110 by diagonal lines) problem. 此外,这种面光源装置101如图43及图44所示,具有从导光板102 的入射面上下边缘部103A、 103B射入的光H1、 H2容易从射出面106的入射面附近部分作为明亮的线(亮线)111射出(容易辩认)的问题。 Furthermore, such a surface light source device 101 in FIG. 43 and FIG. 44, having a lower edge portion 103A from the incident surface of the light guide plate 102, 103B incident light H1, H2 readily from a portion near the exit surface of the incident surface 106 as bright lines (bright lines) 111 emitted (easily recognizable) problem. 这种面光源装置101的问题,在谋求显示画面大型化上,因为要尽可能地将导光板102的有效发光面积(能作为均匀的面照明光使用的射出面上的面积)做大,近年来, 在该行业内,对此更加密切关注。 This problem of surface light source device 101, seeking on the screen size of the display, because (the area of ​​the light exit surface can be used as a uniform illumination of the surface) should be kept as an effective light emitting area of ​​the light guide plate 102 bigger, in recent years, come within the industry, which more closely.

发明内容 SUMMARY

本发明的目的为谋求能抑制使用点光源的LED或线状光源的荧光灯的导光 The light guide object of the present invention can be suppressed to seek a point light source or a linear light source is an LED fluorescent lamp

板和面光源装置的入射面附近异常发光,使射出光亮度均匀化。 Near the incident surface plate and the abnormal light emitting surface light source device, so that uniform brightness is emitted. 此外,本发明的又一目的为谋求提高具备这种导光板和面光源装置的图象显示装置的照明质量。 Further, still another object of the present invention includes an image to be improved such a light guide plate and surface light source device of the display quality of the illumination device.

本发明的面光源装置,在导光板的侧面配置光源,来自该光源的光射入导光板的内部后在导光板的内部传播,在这种传播过程中,从导光板的射出面射出对于射出面入射角的临界角以下的光,在这样的面光源装置中,导光板的射出面和其相反一侧面这两个面中的另一个面上,从侧面开始朝着远去方向延伸的棱形凸起沿着侧面平行形成多条,棱形凸起的前述侧面的部分形成具有随着靠近侧面使凸起高度逐渐降低的倾向。 The surface light source device of the present invention, a light source disposed on the side of the light guide plate, the light guide plate propagate in the interior of the light guide plate is incident from the light source, in which the propagation process, the light guide plate is emitted from the emission surface for emitting below the critical angle the incident angle of the light plane, in such a surface light source device, the exit surface and a side surface thereof opposite to the other surface of the light guide plate of the two surfaces, and began to move away from the side edge extending in a direction shaped protrusions are formed along the sides of a plurality of parallel, part of the side surface of the prismatic projection having a tendency to form so as approaching the side projection height gradually decreases. 这里,所谓"具有使凸起高度逐渐降低 Here, "has a projection height gradually decreases

的倾向"例如,如图18C〜图18D所示,意思为包括在一部分上,凸起高度具有一定的部分(从侧面4开始至Pa点范围)的棱形凸起。 Tendency "For example, as shown in FIG. 18C~ FIG. 18D, meant to include a portion, having a protrusion height constant portion (4 ranging from the start point side to Pa) of the prismatic protrusion.

这种面光源装置也适用于光源为点光源以外的棒状光源的场合。 This surface light source device is also applicable to rod-shaped light source is a light source other than the point light source applications. 此外,也可以在导光板的射出面和其相反一侧面这两个面中的另一个面上,形成与导光板的射出面及其相反一侧面这两个面中的一个面上形成的棱形凸起同样的棱形凸起。 In addition, the other surface may be the surface of the two exit face of the guide and opposite to a side surface thereof, formed with the ribs formed on one of the face and the two exit faces of the light guide plate opposite to a side surface the same prism protrusions shaped projection. 此外,理想的为形成棱形凸起面中侧面附近为平面。 Further, it is desirable to form a prismatic projections near the side surface is flat. 还有,理想的为邻接棱形凸起侧面侧部分包括相邻的凸起间的沟形形成断面实质上呈园弧状的部分。 Further, preferably prismatic convex side adjacent to the side portion includes a groove formed between the adjacent convex portions is formed substantially in the cross-sectional arc park. 在光源为点光源的场合,理想的为形成棱形凸起,使得至少在侧面附近,点光源光轴上的凸起高度为最小,随着从点源的光轴向着沿侧面方向离凸骈起高度逐渐增加。 In the case where the light source is a point light source, it is desirable to form a prismatic protrusion, such that at least in the vicinity of the side surface, the height of the projections on the optical axis of the point light source to a minimum, as a point source from the optical axis toward the direction away from projections along a side gradually increasing in height from the Pian. 另一方面,在光源为棒状光源时,理想的为形成棱形凸起, 使至少在侧面附近,从棒状光源两端部附近沿着朝棒状光源各端部侧的方向其凸起高度逐渐增加。 On the other hand, when the rod-shaped light source is a light source, preferably formed as prismatic projections, at least in the vicinity of the side surface, both end portions from the vicinity of the rod-shaped light source projection height which gradually increases in the direction toward the respective end portions of the rod-shaped light source side .

在这种面光源装置中,可以形成在和棱形凸起的形成的面相反一侧的面上,随着远离侧面凸起高度逐渐降低并且一偏离规定尺寸其凸起高度就变成零,有别于棱形凸起的其它棱形凸起,包括邻接的凸起间的沟形状成为断面实质上呈园弧形的部分。 In such a surface light source device, may be formed on the surface and the surface opposite the prismatic projection is formed, as the height of the protrusion gradually decreases away from the side and a dimension which deviates from a predetermined projection height becomes zero, Unlike other prismatic projection prismatic projections, including the shape of the groove between the adjacent convex portions becomes circular arc shape in cross-section substantially. 在光源为点光源的场合,理想的为形成其它的棱形凸起, 使得至少在侧面的附近,点光源光轴上的凸起高度成为最小,随着从点光源的光轴向沿着前述侧面方向远离凸起高度逐渐增加。 In the case of the light source is a point light source, it is desirable to form the other prismatic projections, such that at least in the vicinity of the side of the point light source on the optical axis of the projection height is minimized, as the point light source from the optical axis along the direction away from the projection side surface gradually increasing in height. 另一方面,在光源为棒状光源的场合,理想的为形成别的棱形凸起,使得至少在侧面的附近,从棒状光源的两端部附近开始沿着向棒状光源的各端部侧的方向其凸起高度逐渐增加。 On the other hand, in the case where the light source is rod-shaped light source, it is desirable to form another prismatic projections, at least in the vicinity of the side surface such that, starting from the vicinity of both end portions of the rod-shaped light sources along the side of the respective end portions of the rod-shaped light sources gradually increasing in height direction of the projections.

在上述面光源装置中,理想的为在导光板的射出面及其相反一侧面这两个面中的另一个面上,沿着侧面平行地形成多条从侧面开始向着远离的方向延伸 In the surface light source device, it is preferable for the exit surface and the other surface of the light guide plate opposite to a side surface of the two surfaces is formed from a plurality of sides extending away toward the direction in parallel along the side

的棱形凸起,将导光板的射出面及其相反一侧面这两个面中的另一个面上形成的棱形凸起做成随着从侧面开始远去凸起高度具有逐渐降低的倾向并且从侧面开始一偏离规定尺寸其凸起高度就变成零。 The prism protrusions formed on the other surface of the prism exit surface and a side surface of the light guide plate opposite to the two faces of the projections is made from the side with the protrusion height tends away starts gradually decreasing and start from the side of a predetermined size which deviates from the height of the projection becomes zero. 这里,所谓"凸起高度具有逐渐 Here, "having a projection height gradually

降低的倾向"例如,如图18B〜图18C所示,意思为也包括部分具有凸起高度一定的部分(从侧面4开始至P6点的范围)的棱形凸起。在该场合,理想的为将导光板的射出面及其相反一侧面这两个面中的另一个面上形成的棱形凸起邻接的凸起间的沟形做成断面实质上呈园弧形。在光源为点光源的场合,理想的为在导光板的射出面及其相反一侧面这两个面中的另一个面上形成的棱形凸起做成至少在侧面的附近,点光源的光轴上的突起高度为最小,随着从点光源的光轴开始朝着沿前述侧面的方向离去凸起高度逐渐增加。另一方面,在光源为棒状光源的场合,理想的为将导光板的射出面及其相反一侧面这两个面中的另一个面上形成的棱形凸起做成至少在侧面的附近,从棒状光源的两端部附近沿着向棒状光源的各端部侧的方向其凸起高度逐渐增加。此外,在这种面 Tends to decrease, "for example, as shown in FIG. 18C 18B~, meant to also include portions (P6 start point to the range from the side surface 4) having a convex prismatic protrusion height constant. In this case, preferably adjacent prismatic projection formed on the other surface of the exit surface of the light guide plate and opposite to a side surface of the two surfaces of the grooves formed between the projections were made of a substantially circular arc cross section. in the light source is a point the case of the light source, preferably in prismatic exit surface and a side surface opposite to the other surface of the light guide plate is formed of two surfaces in the vicinity of at least the protrusion is made in the side of the projection on the optical axis of the point light source minimum height, with the start point light source toward the optical axis direction of the left side surface of the projection height gradually increases. on the other hand, in the case of a rod-shaped light source, it is desirable for the exit surface of the light guide plate and forming a prismatic side face thereof opposite to the other surface of the two faces of the projections is made at least in the vicinity of the side, from the vicinity of both ends of the rod-shaped light sources along the direction of the convex side of the respective end portions of the rod-shaped light sources since the height gradually increases. Further, in this plane 光源装置上,理想的为包括导光板的射出面及其相反一侧面这两个面中的另一个面上形成的棱形凸起侧面侧部分邻接的凸起间的沟形形成断面实质上呈园弧形的部分。在光源为点光源的场合,理想的为将导光板的射出面及其相反侧面这两个面中的另一个面上形成的棱形凸起做成至少在侧面的附近,点光源的光轴上的凸起高度成为最小,随着从点光源的光轴开始向着沿侧面的方向离去,凸起高度逐渐增加。另一方面,在光源为棒状光源的场合,理想的为在导光板的射出面及其相反侧面这两个面中的另一个面上形成的棱形凸起做成至少在侧面的附近,从棒状光源的两端部附近开始沿着向棒状光源各端部侧的方向其凸起高度逐渐增加。 Substantially in the light source apparatus, preferably side portion adjacent to the convex side surface comprises prismatic light guide plate exit surface and a side surface opposite to the other surface of the two surfaces of the channel-shaped cross section is formed between the projection circular arc portion. in the case where the light source is a point light source, is preferably formed on the other surface of the prismatic emitting face of the guide and the opposite side faces of the two projection side surfaces is made in the vicinity of at least the projection on the optical axis of the point light source becomes a minimum height, with the start point light source toward the optical axis direction of the left side surface of the projection height gradually increases. on the other hand, in the case of a rod-shaped light source is a light source, preferably is the exit face of the guide and the prism side surface is formed opposite to the other surface of the two faces of the projections is made at least in the vicinity of the side, from the vicinity of both end portions of the rod-shaped light sources along the rod-like direction of the end side of the projection height which gradually increases.

此外,上述的面光源装置中,可做成在导光板的射出面及其相反一侧面这两个面中的至少一个面上形成能使光漫反射或光扩散的粗糙面,棱形凸起的侧面侧的部分包括邻接的凸起间的沟形做成断面实质上呈园弧形的部分。 Further, the surface light source device can be made of at least one of the face of the emission surface and the two opposite sides of a light guide plate formed can diffuse or roughened surface to diffuse light, prismatic protrusion comprises a portion of the gutter-side surface between the adjacent projections were made of a substantially circular arc cross-section portion.

本发明的其它形态的面光源装置,光源配置在导光板的侧面,该光源的光射入导光板的内部后在导光板的内部传播,在该传播过程中,对于射出面的入射角小于临界角的光、从导光板的射出面射出,在上述面光源装置中,在导光板的射出面及其相反侧面这两个面中的一个面上沿着侧面,平行形成多处从侧面开始随着远去凸起高度逐渐降低,并且一偏离侧面规定尺寸其凸起高度就变成零的棱形凸起,在导光板的射出面及其相反一侧面这两个面中的至少一个面 Other aspect of the present invention, the surface light source device, a light source disposed on the side surface of the light guide plate, the light guide plate in the incident light propagating inside the light guide plate of the light source, the communication process, for less than a critical angle of incidence exit surface the angle of the light, emitted from the emission surface of the light guide plate, in the surface light source device, a surface of the light guide plate exit surface and the opposite side of the two surfaces is formed with multiple starts along the sides from the side, parallel the projection height gradually decreases away, and offset from a side surface of a predetermined size which protrusion height becomes zero prismatic protrusion, the exit surface and a side surface of the light guide plate opposite to a surface of the at least two surfaces of

上,形成能使光漫反射或光扩散的粗糙面,棱形凸起包括邻接的凸起间的沟形做成实质上呈园弧形的部分。 , Forming a light can diffuse or roughened surface to diffuse light, the prismatic projection grooves formed between adjacent projections comprises a part made of a substantially circular arc shape.

这种面光源装置除了光源为点光源之外,还适用于棒状光源的场合。 This surface light source device in addition to the light source is a point light source, is also applicable to the case of the rod-shaped light sources. 光源为点光源的场合,理想的为形成棱形凸起,使得至少在侧面附近,点光源光轴上的凸起高度为最小,随着从点光源光轴开始向沿着侧面的方向离去凸起高度逐渐增加。 Where the light source is a point light source, it is desirable to form a prismatic protrusion, such that at least in the vicinity of the side surface, the height of the projections on the optical axis of the point light source to a minimum, as from the point light source optical axis in a direction along the sides of the leaving the projection height gradually increases. 另一方面,光源为棒状光源的场合,理想的为形成棱形凸起,使得至少在侧面的附近,从棒状光源两端部附近沿着向棒状光源各端部侧的方向其凸起高度逐渐增加。 On the other hand, the rod-shaped light source of the light source, preferably formed as prismatic projections, such that at least in the vicinity of the side of the rod-shaped light from the vicinity of both end portions thereof in a direction along the height of the projections of each end side of the rod-shaped light gradually increase.

本发明的导光板,在这种来自从侧面射入的光源的光在导光板内部传播的过程中,对于射出面的入射角小于临界角的光从射出面射出的导光板上,在射出面及其相反一侧面这两个面中的另一个面上,沿着侧面平行形成多条从侧面开始向着远去的方向延伸的棱形凸起,棱形凸起的前述侧面侧部分,越靠近侧面凸起高度就逐渐增高。 The light guide plate according to the present invention, in which the process from the side of incident light from the light source is propagated in the light guide plate of, for angles of incidence less than the exit surface of the light guide plate is emitted from the exit surface of the critical angle, the exit plane and a side surface opposite to the other surface of the two plane, parallel side surfaces are formed along the side surface extends from the prism toward the direction away a plurality of projections, the projections of the prism side surface portion, the closer side bump height gradually increased.

该导光板除了光源为点光源之外,还适用于棒状光源。 The light guide plate except for the point light source, is also applicable to rod-shaped light sources. 此外,也可在导光板的射出面及其相反一侧面这两个面中的另一个面上形成和导光板的射出面及其相反一侧面这两个面中的一个面上形成的棱形凸起同样的棱形凸起。 Prism exit surface and a side surface opposite to addition, may be formed on the light guide plate exit surface and a side surface of the light guide plate opposite to the other surface of the two surfaces is formed on one surface of the two surfaces the same prism protrusions projections. 此外,理想的为棱形凸起形成的面中的侧面附近为平面。 Further, it is desirable for the prismatic projection formed in the side surface near the plane. 再有,理想的为棱形凸起的侧面侧的部分包括邻接的凸起间的沟形形成实质上呈园弧形的部分。 Further, prismatic portion preferably comprises a side surface of the convex-shaped grooves between the adjacent convex portions is formed in a substantially circular arc shape. 光源为点光源时,理想的为形成棱形凸起,使得至少在侧面附近,点光源光轴上的起高度为最小,从点光源光轴开始向着沿侧面的方向远去凸起高度逐渐增加。 When the light source is a point light source, it is desirable to form a prismatic protrusion, such that at least in the vicinity of the side surface, the height from the optical axis of the point light source to a minimum, in the direction toward the start side of the projection height gradually increases away from the optical axis of the point light source . 另一方面在棒状光源时,理想的为形成棱形凸起,使得至少在側面附近,从棒状光源两端部附近沿着向棒状光源各端部侧的方向其凸起高度逐渐增加。 On the other hand when the rod-shaped light source, it is desirable to form a prismatic protrusion, such that at least in the vicinity of the side surface, both end portions from the vicinity of the rod-shaped light source along a projection height which gradually increases toward the respective ends of the rod-shaped light source side.

在这种导光板中,可以做成在与形成棱形凸起的面相反一侧的面上,从侧面开始随着远去起高度逐渐降低并且从侧面开始一偏离规定尺寸其凸起高度就变成零,有别于棱形凸起的其它的棱形凸起,包括邻接的凸起间的沟形成为断面实质上呈园弧形的部分。 In this light guide plate, can be made on the surface opposite to the surface of the prismatic projection formed from the side away gradually decreases with height starting from the side and the beginning of a size which deviates from a predetermined height on the projection becomes zero, the other is different from the prism protrusions prismatic protrusion, comprising grooves between the adjacent convex portions is formed as a section of a substantially circular arc shape. 在光源为点光源时,理想的为形成其它的棱形凸起,使得至少在侧面的附近,点光源光轴上的凸起高度为最小,从点光源的光轴开始随着沿前述侧面的方向离去凸起高度逐渐增加。 When the light source is a point light source, it is desirable to form the other prismatic projections, such that at least in the vicinity of the side of the bump height on the optical axis of the point light sources is minimized, starting from a point source along said optical axis with the side surface leaving protrusions gradually increasing in height direction. 另一方面,在光源为棒状光源时,理想的为形成其它的棱形凸起,至少在侧面的附近,从棒状光源两端部附近开始沿着向棒状光源各端部侧的方向其凸起高度逐渐增加。 On the other hand, when the light source is rod-shaped light source, it is desirable to form the other prismatic projections, at least in the vicinity of the side of the rod-shaped light from the vicinity of both end portions along the direction of projection starts its respective end side portions of the rod-shaped light source gradually increasing in height.

在上述导光板中,可以做成在导光板的射出面及其相反一侧面这两个面中 In the light guide plate, the exit surface can be made in a side surface of the light guide plate and the opposite surfaces of these two

的另一个面上,沿着侧面平行形成多条从側面开始向着远去的方向延伸的棱形凸起,将导光板射出面及其相反一側面这两个面中的另一个面上形成的棱形凸起越远离侧面凸起高度逐渐降低并且从侧面开始一旦偏离规定尺寸其凸起高度就变成零。 The other surface, are formed in parallel in the direction angled away from the side surface of beginning a plurality of projections extending along the sides, forming the other surface opposite to the light guide plate exit surface and a side surface of the two surfaces prismatic protrusion height of the protrusion gradually decreases away from the side and from the side of a predetermined size deviate from its beginning once the protrusion height becomes zero. 在这时,理想的为将导光板的射出面及其相反一侧面这两个面中的另一个面上形成的棱形凸起邻接的凸起间的沟形状做成断面呈园弧形。 At this time, it is desirable for the shape of the groove formed between the other surface of the prism exit surface and a side surface of the light guide plate opposite to the two adjacent projection plane projection section was made circular arc. 光源 light source

为点光源时,理想的为将导光板的射出面及其相反一侧面这两个面中的另一个面上形成的棱形凸起做成,至少在侧面附近,点光源光轴上的凸起高度为最小, 从点光源光轴开始向着沿前述侧面的方向随着离去凸起高度逐渐增加。 Is a point light source, it is desirable to form the prism exit surface and the other surface of the light guide plate opposite to a side surface of the two surfaces made of projections, at least in the vicinity of the side surface, a point light source on the optical axis of projection since minimum height, from the point light source toward the optical axis direction of the side surface of the projection height gradually increases with the departure. 另一方面,在光源为棒状光源时,理想的为将导光板出面及其相反一侧面这两个面中的另一个面上形成的棱形凸起做起,至少在侧面附近,从棒状光源两端部附近 On the other hand, when the rod-shaped light source is a light source, preferably formed of prismatic light guide plate to come forward and the other surface opposite to a side surface of the two faces of the start projections, at least in the vicinity of the rod-shaped light source side, from near both ends

开始沿着向棒状光源各端部侧的方向其凸起高度逐渐增加。 Gradually increases along the direction of the respective side end portions of the rod-shaped light projection height thereof. 此外,在该导光板中,理想的为导光板的射出面及其相反一侧面这两个面中的一个面上形成的棱形凸起的侧面侧的部分包括邻接的凸起间的沟形做成实质上呈园弧形的部分。 Prismatic convex part side surface Further, in the light guide plate, preferably formed as a plane face of the two exit faces and the opposite side surface of the light guide plate comprises a groove formed between adjacent projections portion made of a substantially circular arc shape. 在光源为点光源时,理想的为将导光板的射出面及其相反一侧面这两个面中的一个面上形成的棱形凸起做成,至少在侧面附近,点光源的光轴上的凸起高度为最小,从点光源的光轴开始,朝着沿侧面的方向随着离去凸起高度逐渐增加。 When the light source is a point light source, preferably to the prismatic emitting face of the guide and a side surface opposite to one surface of two surfaces of the projection is made, at least in the vicinity of the side on the optical axis, the point light source the minimum height of the projections, starting from the optical axis of the point light source, the direction along the side surface of the projection height gradually increases with the departure. 另一方面,在光源为棒状光源时,理想的为将导光板的射出面及其相反一侧面这两个面中的一个面上形成的棱形凸起做成,至少在侧面附近,从棒状光源两端部附近开始沿着向棒状光源各端部侧的方向其凸起高度逐渐增加。 On the other hand, when the light source is rod-shaped light source is preferably formed on a surface of the prism exit surface and the light guide plate opposite to a side surface of the two faces of the projections is made, at least in the vicinity of the side from the rod-shaped start both end portions near the light source in a direction along its respective end portions of the rod-shaped light source side projection height gradually increases.

此外,在上述的导光板中,可做成在导光板的射出面及其相反一侧面这两个面中的至少一个面上,形成能使光漫反射或光扩散的粗糙面,棱形凸起侧面侧的部分包括邻接的凸起间的沟形状做成实质上呈园弧形的部分。 Further, in the above-described light guide plate may be made of at least one of the face surface and the two exit light guide plate opposite to a side surface, forming a light can diffuse or roughened surface to diffuse light, the prismatic projection since the groove portion includes a side surface shape between the adjacent projections were made of a substantially circular arc portion.

本发明的其它形态的导光板,在这种来自侧面射入的光源的光在导光板内部传播的过程中,对于射出面的入射角小于临界的光从射出面射出的导光板上,射出面及其相反一侧的面这两个面中的一个面上,沿着侧面平行形成多条从侧面开始随着远去凸起高度逐渐降低。 Other aspect of the present invention, the light guide plate, in such a process the light from the light source side incident propagating inside the light guide plate, is smaller than the critical angle of incidence for the light exit plane of the light emitted from the emission surface of the light guide plate exit surface and a surface opposite to one surface of the two surfaces is formed from the side away gradually decreased with a plurality of projections along a side parallel to the height. 并且从侧面开始一偏离规定尺寸其凸起高度就变成零的棱形凸起,在射出面及其相反一侧面这两个面中的至少一个面上,形成能使光漫反射或光扩散的粗糙面,棱形凸起包括邻接的凸起间的沟形做成断面实质上呈园弧状的部分。 And start from the side of a predetermined size deviate from its convex prismatic protrusion height becomes zero, at least one of the face of the emission surface and the two opposite sides a, can form a light-scattering or light-diffusing rough surface, comprising a prismatic projection grooves formed between adjacent convex section made substantially in the arcuate portion park.

该导光板除了光源为点光源之外,还适用于棒状光源的场合。 The light guide plate except for the point light source, is also applicable to the case of the rod-shaped light sources. 在光源为点光源时,理想的为形成棱形凸起,使得至少在侧面附近,点光源光轴上的凸起 When the light source is a point light source, it is desirable to form a prismatic protrusion, such that at least in the vicinity of the side surface, a point light source on the optical axis of the projection

高度为最小,从点光源光轴开始向着沿侧面的方向随着离去凸起高度逐渐增加。 Minimum height, from the point light source toward the optical axis direction of the side surface of the projection height gradually increases with the departure. 另一方面,在光源为棒状光源时,理想的为形成棱形凸起,使得至少在侧面附近,从棒状光源两端部附近开始沿着向棒状光源各端部侧的方向其凸起高度逐渐增加。 On the other hand, when the rod-shaped light source is a light source, preferably formed as prismatic projections, such that at least in the vicinity of the side surface, both end portions from the vicinity of the rod-shaped light sources along the direction of the start end side of the rod-shaped light projection height gradually increase.

本发明的图象显示装置,包括上述任一项面光源装置,及利用这种面光源装置射出的光进行面状照明的被照明部分。 The image display apparatus according to the present invention, including any preceding surface light source device and a surface light source device utilizing such light emitted from the illuminated portion is planar illumination.

附图说明 BRIEF DESCRIPTION

图1表示本发明第1实施形态的图象显示装置分解立体图。 FIG 1 shows a first embodiment of the present invention, the image display device of an exploded perspective view of FIG.

图2表示图i的n — n线剖视图。 FIG 2 shows a i n - n line cross-sectional view.

图3表示除去图2的反射片后的B方向视图。 Figure 3 shows the direction B after removing the reflection sheet 2 is a view of FIG.

图4A〜图4E表示第1实施形态的导光板局部放大剖视图,图4A表示沿图3的IVA—IVA线切断的局部放大剖视图,图4B表示沿图3的IVB — IVB线切断的局部放大剖视图。 Partial view 4A~ FIG 4E shows a first embodiment of the light guide plate partially enlarged cross-sectional view, FIG. 4A shows along line IVA-IVA 3 cut enlarged sectional view, IVB FIG. 4B showing in FIG. 3 - IVB line cut partially enlarged cross-sectional view . 图4C表示沿图3的IVC—IVC线切断的局部放大剖视图, 图4D表示沿图3的IVD—IVD线切断的局部放大剖视图,图4E表示沿图3的IV E—IVE线切断的局部放大剖视图。 4C shows along the line IVC-IVC 3 cut partially enlarged cross-sectional view, FIG. 4D shows along the IVD-IVD line 3 is cut partially enlarged cross-sectional view, FIG. 4E shows along IV E-IVE wire 3 is cut partially enlarged sectional view.

图5表示导光板的棱形凸起的聚光功能。 Figure 5 shows the light guide plate prism protrusions condensing function.

图6表示棱形凸起的形状变形示例。 6 shows a modified example of the shape of the prismatic projection.

图7表示棱形凸起的形状的其它变形示例。 7 shows another modified example of the shape of the prismatic projection.

图8表示本发明第l实施形态的图像显示装置的变形示例的图象显示装置的分解立体图。 FIG 8 shows an image of the embodiment of the present invention l exploded perspective view of a modified example of the image display device.

图9表示本发明第l实施形态的图象显示装置的其它变形示例的图象显示装置的剖视图(与图2对应的图)。 L FIG. 9 shows the embodiment of the present invention display an image (corresponding to FIG. 2 and FIG.) Sectional view of a another modified example of the image display apparatus.

图IO表示本发明第1实施形态的图象显示装置的其它变形示例的图象显示装置的分解立体图。 FIG IO showing a first embodiment of the present invention is an image display device according exploded perspective view showing another modified example of the image display device.

图ll表示图IO的XI — XI线剖视图。 FIG ll represents the FIG IO XI - XI line sectional view.

图12表示除去图10的反射片后的B1方向视图。 12 shows the removal direction of the rear reflecting sheet B1 in FIG. 10. FIG.

图13表示本发明第1实施形态的图象显示装置的其它的变形示例的图象显示装置的分解立体图。 13 shows a first embodiment of the present invention, the image display apparatus of FIG exploded perspective view of another modified example of the image display device.

图14表示本发明第1实施形态的图象显示装置的其它变形示例的剖视图(与图2对应的图)。 14 shows a sectional view of another modified example of the apparatus (corresponding to FIG. 2 and FIG.) Of the first embodiment of the present invention, the image display.

图15A表示本发明第2实施形态的导光板的平面图,图15B表示图15A的XVB — XVB线剖视图。 15A shows a second embodiment of the present invention, a plan view of the light guide plate, 15A of FIG. 15B shows XVB - XVB line cross-sectional view.

图16A〜图16D表示沿图15B的XVIA—XVIA线〜XVID —XVID线切断的导光板局部放大剖视图。 16A~ FIG 16D shows a partially enlarged cross-sectional view taken along line XVIA-XVIA of FIG. 15B ~XVID -XVID guide plate along the line.

图17A表示本发明第2实施形态的变形示例的导光板平面图,图17B表示图17A的XV0B — XVEB线剖视图。 FIG 17A shows a modification of the second exemplary embodiment of the present invention, a plan view of the light guide plate, FIG. 17A to 17B showing FIG XV0B - XVEB line cross-sectional view.

图18A〜图18D表示本发明第3实施形态的导光板,图18A表示导光板平面图,图18B表示图18A的XVIDB—XVD1B线剖视图,图18C表示图18A的XV1IIC 一XVIDC线剖视图,图18D表示图18A的XVIDD — XV1D线的剖视图。 FIG 18A~ FIG. 18D showing the light guide plate of the third embodiment of the present invention, the light guide plate 18A shows a plan view, FIG. 18B shows the line 18A XVIDB-XVD1B sectional view, FIG XV1IIC 18C shows a sectional view XVIDC line 18A, FIG. 18D showing FIG. 18A XVIDD - XV1D line cross-sectional view.

图19A〜图19D表示沿图18B的XIXA — XIXA线〜XIXD线切断后的导光板局部放大剖视图。 FIG 19A~ FIG. 19D showing in FIG. 18B XIXA - after the guide plate ~XIXD wire cutting line XIXA partially enlarged cross-sectional view.

图20A〜图20D表示沿图18C的XXA—XXA线〜XXD—XXD线切断后的导光板局部放大剖视图。 FIG 20A~ 20D shows a partially enlarged cross-sectional view of the light guide plate taken along the line XXA-XXA of FIG ~XXD-XXD cut line 18C.

图21A〜图21D表示沿图18D的XXIA — XXIA线〜XXID —XXID线切断后的 FIG 21A~ showing FIG 21D taken along the XXIA 18D - XXIA line after line of cut ~XXID -XXID

导光板局部放大剖视图。 Partially enlarged sectional view of the light guide plate.

图22表示说明导光板的断面用的图。 22 shows a section for explaining a light guide plate used in FIG.

图23A〜图23D表示本发明第3实施形态变形示例涉及的导光板,图23A 表示导光板的平面图23B表示图23A的XXniB — XXIIIB线剖视图,图23C表示图23A的XXmC — XXniC线剖视图,图23D表示图23A的XXIIID—XXIIID线剖视图。 FIG 23A~ FIG. 23D showing a third modified form of the light guide plate exemplary embodiment according to the present invention, FIG. 23A shows a plan view of the light guide plate 23B in FIG. 23A represents XXniB - XXIIIB line cross-sectional view, FIG. 23A XXmC FIG. 23C showing - XXniC line sectional view of FIG. FIG. 23A 23D represents XXIIID-XXIIID line cross-sectional view.

图24A〜图24D表示本发明第4实施形态的导光板,图24A表示导光板平面图,图24B表示图24A的XXIVB — XXIVB线剖视图,图24C表示图24A的XX IVC —XXIVC线剖视图,图24D表示图24A的XXIVD — XXIVD线剖视图。 FIG 24A~ FIG 24D shows a fourth embodiment of the present invention, the light guide plate, FIG. 24A shows a plan view of the light guide plate, 24A, FIG. 24B shows XXIVB - XXIVB line sectional view of FIG. 24A FIG. 24C showing the sectional view along line XX IVC -XXIVC, FIG. 24D 24A is a diagram showing XXIVD - XXIVD line cross-sectional view.

图25A〜图25D表示本发明第4实施形态的变形示例的导光板,图25A表示导光板平面图,图25B表示图25A的XXVB — XXVB线剖视图,图25C表示图25A的XXVC — XXVC线剖视图,图25D表示图25A的XXVD —XXVD线剖视图。 FIG 25A~ FIG. 25D showing the light guide plate according to a fourth modified example embodiment of the present invention, FIG. 25A shows a plan view of the light guide plate, 25A, FIG. 25B shows XXVB - XXVB line cross-sectional view, FIG. 25A FIG. 25C showing XXVC - XXVC line cross-sectional view, FIG. 25A XXVD -XXVD line cross-sectional view showing FIG 25D.

图26A〜图26D表示本发明第5实施形态涉导光板,图26A表示导光板平面图,图26B表示图26A的XXVIB —XXVIB线剖视图,图26C表示图26A的XX VIC — XXVIC线剖视图,图26D表示图26A的XXVID—XXVID线剖视图。 FIG 26A~ FIG. 26D showing a fifth embodiment of the present invention relates to a light guide plate, the light guide plate 26A shows a plan view, FIG. 26B shows a line XXVIB -XXVIB 26A is a sectional view, FIG. 26C is a view showing XX VIC 26A - XXVIC line cross-sectional view, FIG. 26D 26A is a diagram showing a sectional view along line XXVID-XXVID.

图27A〜图27D表示本发明第5实施形态的变形示例的的导光板,图27A 表示导光板平面图,图27B表示图27A的XXWB—XXVnB线剖视图,图27C表 FIG 27A~ FIG 27D shows a modification example of the fifth embodiment of the present invention, the light guide plate, FIG. 27A shows a plan view of the light guide plate, FIG. 27B shows the line 27A XXWB-XXVnB sectional view, FIG. 27C table

示图27A的XXWC — XXWC线剖视图,图27D表示图27D的XXWD — XXVHD线剖视图。 XXWC shown in FIG. 27A - XXWC line cross-sectional view, FIG. 27D showing FIG 27D XXWD - XXVHD line cross-sectional view.

图28A〜图28D表示本发明第6实施形态的导光板,图28A表示导光板的平面图,图28B表示图28A的XXMB — XXV1BB线剖视图,图28C表示图28A的XXVIDC — XXVIIIC线剖视图,图28D表示图28A的XXVIBD—XXV1DD线剖视图。 FIG 28A~ FIG. 28D showing a sixth embodiment of the present invention, the light guide plate, FIG. 28A shows a plan view of the light guide plate, FIG. 28A to 28B showing FIG XXMB - XXV1BB line cross-sectional view, 28A of FIG. 28C showing FIG XXVIDC - XXVIIIC line cross-sectional view, FIG. 28D 28A is a diagram showing a sectional view along line XXVIBD-XXV1DD.

图29放大表示本发明第6实施形态的导光板背面一部分。 FIG 29 shows a rear enlarged portion of the light guide plate of a sixth embodiment of the present invention.

图30A〜图30D表示本发明第7实施形态的导光板,图30A表示导光板的平面图,图30B表示图30A的XXXB —XXXB线剖视图,图30C表示图30A的XXXC 一XXXC线剖视图,图30D表示图30A的XXXD —XXXD线剖视图。 FIG 30A~ FIG 30D shows a seventh embodiment of the present invention, the light guide plate, FIG. 30A shows a plan view of the light guide plate, FIG. 30B shows the line XXXB -XXXB FIG. 30A is a sectional view, FIG. 30C showing a XXXC line XXXC FIG 30A is a sectional view, FIG. 30D FIG sectional view showing XXXD -XXXD line 30A.

图31A〜图31B表示本发明第8实施形态的导光板,图31A表示导光板的平面图,图31B表示图31A的XXXIB —XXXIB线剖视图。 FIG. FIG. 31B shows the light guide plate 31A~ eighth embodiment of the present invention, a plan view of the light guide plate of FIG. 31A, FIG. 31B shows the line 31A of FIG XXXIB -XXXIB sectional view of FIG.

图32A〜图32B表示本发明第9实施形态的导光板,图32A表示导光板的平面图,图32B表示图32A的XXXDB—XXXSB线剖视图。 FIG 32A~ FIG. 32B shows a ninth embodiment of the present invention, the light guide plate, a plan view of the light guide plate of FIG. 32A, FIG. 32B XXXDB-XXXSB FIG 32A is a sectional view showing the line.

图33表示LED配置构成的变形示例。 33 shows a modified example of an LED arrangement configuration.

图34A〜图34C表示本发明第IO实施形态的涉导光板,图34A表示模式地表示导光板和液晶显示屏间关系的纵剖视图(图34B的XXXIVA—XXXIVA线剖视图),图34B表示导光板平面图,图34C表示导光板射出面上形成的粗糙面覆盖平面曲线图。 FIG 34A~ FIG. 34C showing the first IO embodiment relates to a light guide plate of the present invention, FIG. 34A showing schematically a longitudinal relationship between the light guide plate and LCD sectional view (XXXIVA-XXXIVA of FIG. 34B is a sectional view of the line), Fig. 34B represents a guide plate plan view, FIG. 34C showing a rough surface formed on the light guide plate exit surface of the covering plane graph.

图35A〜图35C表示本发明的第IO实施形态的导光板的变形示例,图35A 表示模式地表示导光板的变形示例,图35A表示模式地表示导光板和液晶显示屏间关系的纵剖视图(图35B的XXXVA—XXXVA线剖视图),图35B表示导光板平面图,图35C表示导光板的射出面上形成的粗糙面的覆盖率曲线图。 FIG 35A~ FIG 35C shows a modification of the light guide plate IO exemplary embodiment of the present invention, the vertical relationship between the light guide plate and LCD panel 35A of a schematic cross-sectional view showing a modified example of the light guide plate, FIG. 35A shows schematically showing ( line XXXVA-XXXVA of FIG. 35B is a cross-sectional view), FIG. 35B shows a plan view of the light guide plate, FIG. 35C represents a graph showing the coverage of the roughened surface formed on the output surface of the light guide plate.

图36表示本发明第11实施形态的导光板,表示导光板应用例子的示意图。 36 shows the light guide plate 11 of the embodiment of the present invention, a schematic representation of an example of application of the light guide plate.

图37表示本发明第11实施形态的导光板的其它应用例子的示意图。 FIG 37 shows a schematic view of another application example of the light guide plate 11 embodiment of the present invention.

图38表示本发明第12实施形态的棱形片的棱形凸起形状的第1例的示意图。 38 shows a schematic view of a first example of a prismatic prism sheet 12 of the present embodiment of the invention a convex shape.

图39表示本发明第12实施形态的棱形片的棱形凸起形状的第2例的示意图。 39 shows a schematic view of a second embodiment 12 of a prismatic embodiment of the present invention prismatic convex shape of the sheet.

图40表示以往的面光源装置的平面图。 FIG 40 is a plan view showing a conventional surface light source device.

图41表示图40面光源装置的侧视图。 41 shows a side view of the surface light source device 40 of FIG.

图42表示图40的F方向导光板局部放大图。 FIG. 42 shows a direction of the light guide plate 40 F partially enlarged view.

图43表示以往的其它面光源装置的平面图。 43 shows a plan view of another conventional surface light source device.

图44表示图43的面光源装置侧视图。 FIG 44 shows a side view of the surface light source device 43. 实施本发明的最佳形态 Preferred embodiment of the present invention

以下,参照附图详细说明本发明的实施形态。 Hereinafter, embodiments of the present invention with reference to the accompanying drawings. [第1实施形态] [First Embodiment]

图〜图3表示本发明第1实施形态的及的图象显示装置1。 FIGS to 3 illustrate a first embodiment of an image and the aspect of the present invention, the display device 1. 其中,图l表 Wherein FIG Table l

示图象显示装置i的分解立体图。 I is an exploded perspective view illustrating the image display apparatus. 此外,图2表示沿图i的n—n线切断后 In addition, Figure 2 shows along the line n-n i is cut

的剖视图,图3表示除去反射片2后的B方向视图。 Sectional view, FIG. 3 represents the direction B after removing the reflection sheet 2 view.

在这些图中,图象显示装置1配置多个与导光板3的入射面(侧面)4对向、作表示点光源的LED (发光二极管)5。 In these figures, the incident surface of the image display device 1 and a plurality of light guide plate 3 (the side surface) the four pairs, as represented by a point light source LED (light emitting diode) 5. 而且,如与导光板3的射出面(图l中,上面)6对向那样地重迭配置作为光控制部分的棱形片7,还在棱形片的图1中上面侧上重迭配置作为被照明部件的液晶显示屏8。 Further, the overlapping configuration such as an upper side surface of the light guide plate 3 and the exit (Figure l, above) to the six pairs of overlapping configuration so as prismatic light control sheet portion 7, also FIGS prismatic sheet as a member to be illuminated of the liquid crystal display 8. 此外,如与导光板3的背面(图1中下面,和射出面6相反一侧的面)IO那样,配置着光反射性优良的反射片2。 Further, as the back surface (the following, 6 and exit surface opposite to the surface in FIG. 1) of the light guide plate 3 as IO, Configuration 2 of the excellent light-reflective reflecting sheet. 还有,上述LED5、导光板3、棱形片7及反射片2构成面状照明液晶显示屏的面光源装置11。 Further, LED5 above, the light guide plate 3, prism sheet 7 surface light source device and a reflection sheet 2 is composed of a planar lighting the LCD 11.

导光板3使用P醒A (有机玻璃)、PC (聚碳酸酯)、环希泾系树脂材料等透光性优良的材料,做成随着离入射面4一侧越远板厚逐渐变薄、断面实质上呈楔形的形状(参照图2),并且平面形状做成实质上呈矩形(参照图3)。 P using the light guide plate 3 wake A (PMMA), PC (polycarbonate), ring Jing Xi based resin material excellent in light-transmitting material, made with the thickness from the incident surface 4 farther side tapering , a substantially wedge-shaped cross section (see FIG. 2), and made of a substantially rectangular planar shape (see FIG. 3). 还有,在该导光板3的背面10上,沿着入射面4平行形成多条在与入射面4 实质上正交方向上延伸的棱形凸起12。 Further, on the back surface 10 of the light guide plate 3 is formed along the incidence surface 4 in a plurality of parallel prism 4 extending substantially perpendicular to the direction of the incident surface of the projection 12.

该导光板3的背面10形成的棱形凸起12,在导光板3的侧面侧部分10b 的规定范围L2内,形成棱形凸起12的高度越靠近入射面4而逐渐降低,做成在导光板3的入射面附近(在远离导光板3的入射面4的方向上至离开规定距离Ll位置的背面lO) 10a处其高度为零。 The back surface of the prism 10 of the light guide plate 3 a protrusion 12 is formed, in a predetermined range of the side surface portion 10b of the light guide plate 3 L2, the height of the projections 12 of the prism is formed closer to the incident surface 4 gradually decreases, made in nearby (lO back surface to leave a predetermined distance Ll position 4 in the direction away from the incident surface of the light guide plate 3) of the light guide plate 3 at the incident surface 10a whose height is zero. 即导光板3的背面10的入射面附近10a做成平面(参照图4E)再有,上述规定距离L1及规定范围L2根据导光板3的板厚(尤其是入射面4侧的板厚)和LED5的特性等设定成最合适的数值。 I.e., the incident surface 10a near the guide plate 3 is made flat back surface 10 (see FIG. 4E) Further, the predetermined distance L1 and predetermined range L2 depending on the thickness (in particular the thickness of the incidence surface 4 side) of the light guide plate 3 and LED5 like characteristics set to optimum values.

图4A〜图4D表示上述棱形凸起12的断面形状,表示分别沿着IVA—IVA 线一IVD—rVD线切断图3的导光板后各断面的局部放大图。 FIG 4D shows the above-described prismatic 4A~ convex cross-sectional shape 12, showing the light guide plate 3 are cut off after a partial enlarged view of the cross-sections along a line IVA-IVA line IVD-rVD. g卩,棱形凸起12 如图4A所示,除去侧面侧部分10a的规定范围L2的部分(以L3表示的背面部分)10C以几乎一定的高度形成,其断面形状实质上呈三角形,其顶角在50度〜130度的范围里,理想的为定在60度〜110度的范围里。 g Jie, prismatic projections 12 shown in Figure 4A, the side surface portion 10a is removed a predetermined range L2 of a portion (the rear surface portion by L3) 1OC almost constant height is formed, a substantially triangular sectional shape, which apex angle in the range of 50 ° ~130 °, the ideal is set in a range of 60 ° ~110 ° in. 此外,导光板3 的侧面侧部分(以L2表示的范围)10b的棱形凸起12。 Further, the side surface portion of the light guide plate 3 (the range indicated by L2) 10B prismatic projection 12. 如图4B〜图4D所示, 从顶部形成实质上呈园弧形的曲面开始至全体实质上呈丰园形的部分(图4D) 为止连续变化。 4B~ shown in FIG. 4D, the curved surface forming a substantially circular arc shape from the top to form a substantially whole portion of the circular abundance (FIG. 4D) until the change continuously. 还有,上述L2的范围和L3的范围的边缘附近,棱形凸起12 的形状从图4A那样的税角三角形连续地变换成顶部实质上呈园弧形的光滑的三角形。 Further, the vicinity of the edge of the range of the L2 and L3 of the range, the shape of prism protrusions 12 continuously changes from duty corners of the triangle as shown in FIG 4A to a smooth top of a substantially triangular shape of circular arc. 此外,各相邻棱形凸起12、 12间的间距P,在图4A〜图4D上大致相同。 Further, each adjacent prismatic projection pitch P 12, 12 between the substantially the same as in FIG. 4A~ FIG 4D.

在这样构成的导光板3的背面10侧形成的棱形凸起12在从入射面4射入导光板3内部传播的光中,起着将与入射面4实质上平行的面内的光向射出面6的法线方向聚光的功能。 Prism 10 is formed in the rear surface side of the light guide plate 3 thus constructed projection 12 in the interior of the light propagating from the incident surface 4 3 enters the light guide plate, the light to be played in a plane substantially parallel to the incident plane 4 normal direction of emission surface 6 of the condensing function. 但,棱形凸起12的侧面侧部分(L2的范围)10b越靠近入射面4凸起高度逐渐降低,因为棱形凸起12的断面形状从断面实质上呈三角形连续变化成实质上呈半园形,所以棱形凸起12的上述聚光功能越近入射面4就越弱。 However, prismatic convex side surface portion (the range of L2) 10b 4 12 closer to the incident surface projection height gradually decreases, because the cross-sectional shape convex prism 12 by substantially triangular cross-section from a substantially semi-continuously changed to circular, so that the condensing function of prism protrusions 12 closer the incident surface 4 weaker. 而且,导光板3的背面10的入射面附近(Ll的范围)10a 上没有形成棱形凸起12。 Further, the rear surface near the entrance surface 10 of the light guide plate 3 (range Ll) is not formed on the prism protrusions 12 10a. 因此,本实施形态的导光板3即使将LED5作为光源使用,也能有效地防止在以往的例子中一直成为问题的、因导光板3的入射面附近10a形成的棱形凸起12引起的异常发光(参照图40的符号H)。 Accordingly, the present embodiment even when the light guide plate 3 LED5 as a light source, can be effectively prevented in the conventional example has a problem, due to the prismatic light guide plate 3 in the vicinity of the incident surface 10a of the protrusion 12 is formed due to abnormal emission (the reference code H 40). 另一方面,本实施形态的导光板3在射出光亮度易降低的部分(即离开入射面的部分L3的范围)10c上,能充分利用棱形凸起12的聚光功能,促使向射出面6的法线方向射出(参照图5),使得导光板3整体能获得均匀明亮的照明。 On the other hand, the present embodiment the light guide plate 3 (i.e., departing from the scope of the incident surface of the portion L3) in the light emission brightness tends to decrease the portion 1OC, can fully utilize the condensing function of prism protrusions 12, causes the emission surface 6 emitted normal direction (see FIG. 5), so that the entire light guide plate 3 can be obtained uniformly bright illumination. 还有, 导光板3的内部传播的光即离入射面4而去的部分的光因在导光板3内部经多次反射,光的指向性变弱,即使充分利用棱形凸起12的聚光功能,也不会发生以往例子那种异常发光。 Further, the light propagating inside the light guide plate 3, i.e., from the result of the multiply-reflected portion of the light incident surface 4 away in the light guide plate 3, the light directivity becomes weak, even if the full use of the prismatic projections 12 poly light function, the conventional example does not occur that anomalous light emission.

导光板3的射出面6上形成适宜射出面6射出的光扩散的细微的凹凸部的图案。 6 is formed on the exit surface of the light guide plate 3 in a suitable pattern of fine irregularities emitting portion diffusing light exit surface 6. 还有,通过根据射出面的场所适当替换该细微凹凸部的形成密度,从而能将射出光调整得更理想。 Further, by appropriately replacing the density of fine uneven portion is formed depending on the location of the exit surface, thereby capable of emitting light adjusted to be over. 这样,若在导光板3的射出面6上将细微凹凸部形成图案状,和上述棱形凸起12的效果相加,就能使导光板3射出的面照明均匀化。 Thus, if a pattern is formed on the emission surface 6 of the light guide plate 3 minute uneven portion, and said convex prismatic effect of adding 12, you can make the surface of the light guide plate 3 emitted from the illumination uniform.

棱形片7用PET (聚对苯二甲酸二乙酯)、PMMA、或PC等透光性优势的材料形成,做成和导光板3的射出面6几乎同样的矩形形状,在与导光板3的射出面6对向的面(图l及图2中的下面)形成多条棱形凸起。 7 prism sheet of PET (polyethylene terephthalate), a light-transmitting material advantages PMMA, PC, or formed, 6 almost the same rectangular shape and the exit surface is a light guide plate 3, the light guide plate to the surface (lower surface in FIG. 2 and FIG. l) 6 pairs exit surface 3 forms a plurality of prism projections. 该棱形片7的棱形凸起13向与上述导光板3的棱形凸起13向与上述导光板3的棱形凸起12 The prism sheet 7 prismatic projection 13 projects toward the light guide plate 3 and the prism protrusions 12 of the prism 13 and the light guide plate 3

实质上呈正交的方向延伸,沿着与入射面4实质上正交的方向平行形成多条。 Extending in a direction substantially orthogonal shape is formed along a plurality of substantially parallel to the direction perpendicular to the incidence surface 4.

此外,该棱形片7的棱形凸起13形成和图4A所示等导光板3的棱形凸起12 的断面形状几乎同样的形状。 In addition, the prism sheet 7 prism protrusion 13 is formed of prismatic light guide plate 3 and the like shown in FIG. 4A the projections 12 of the cross-sectional shape almost the same shape. 这样构成的棱形片7与导光板3的入射面4正交, 并且发挥将与导光板3的射出面6正交的面内的光偏向导光板3的射出面6的法线方向的功能。 Such prism sheet 7 constituting the light guide plate 3 perpendicular to the incidence surface 4, and the play of light in a plane orthogonal to the emission surface 6 of the light guide plate 3 toward the light guide plate 3 in the normal direction of the emission surface 6 of the function . 即,LED5发出的光通过上述导光板3的棱形凸起12和该棱形片7的棱形凸起13就成两个阶段聚光*偏向。 That is, the light emitted by the light guide plate 3 LED5 prismatic projections 12 and the prism sheet 7 prismatic projections 13 on two phases into converging toward *. 还有,导光板3形成的棱形凸起12和棱形片7形成的棱形凸起13也可以形成几乎不同样的形状,其顶角、 间距、高度等在两凸起12、 13上可以有适当的差异。 Further, the prism light guide plate 3 is formed of prism protrusions 12 formed prismatic sheet 7 and the projection 13 may be formed almost the same shape, apex angle, spacing, height, etc. on the two projections 12, 13 the difference may be appropriate.

反射片2可用白色PET等光反射性优良的材料做成,形成和导光板3的背面10几乎同样大小的矩形形状。 Light reflective material excellent in reflecting sheet 2 and the like made available white PET, and 10 are formed of the same size as the rectangular shape of the back of the light guide plate 3. 该反射片2将导光板3的背面10射出的光反射返回导光板3内部,能有效利用LED5来的光。 The reflective sheet 2 to the back surface 3 of the light guide plate 10 emits the reflected return light guide plate 3, light can be effectively utilized to the LED5.

采用以上构成的本实施形态的图象显示装置1为LED5发出的光从导光板3 的入射面4射入导光板3的内部。 According to this embodiment of the above configuration image display apparatus 1 is a light incident on the light guide plate 3 from the incident surface of the light guide plate 3 4 LED5 emitted. 来自射入导光板3的内部的LED5的光在射出面6和背面10之间反复反射在导光板3的内部传播。 Light incident from the light guide plate 3 is inside LED5 between the emission surface 6 and back surface 10 is repeatedly reflected inside the light guide plate 3 spread. 而且,该导光板3内传播的光,每在背面10上反射一次对于射出面6的入射角就降低,在其传播过程中,对射出面6的入射角小于临界角的光从射出面6向导光板3的外部射出。 Further, the light propagating within the light guide plate 3, the angle of incidence reflected once every emission surface 6 on the back surface 10 is lowered, in its propagation process, the angle of incidence of the light emission surface 6 is smaller than the critical angle from the emission surface 6 emitted to the outside of the light guide plate 3.

在本实施形态中,导光板3如上所述,其背面IO上形成棱形凸起12,但侧面侧部分10b的棱形凸起12做成越近入射面4凸起高度逐渐降低,同时, 其断面形状从实质上呈三角形连续地变化成实质上呈半园形,而且,在入射面附近10a上没有形成棱形凸起12。 In the present embodiment, the light guide plate 3 as described above, is formed on the back surface IO prismatic projection 12, but the side surface portion 10b of the prismatic projection 12 is made incident surface 4 near the projection height gradually reduced, at the same time, sectional shape thereof continuously varies from the substantially triangle to the substantially semi-circular shape, and prismatic projections 12 are not formed in the vicinity of the incident surface 10a. 因此,本实施形态的图象显示装置1,在导光板3入射面附近10a处棱形凸起12的聚光功能不能完全发挥,此外,导光板3的侧面侧部分10b处越近入射面4聚光功能就降低。 Thus, this embodiment of the image display apparatus 1, the condensing function of prism protrusions 12 in the vicinity of the light guide plate 3 at the incident surface 10a can not play, in addition, the light guide plate side surface 10b of the side portion near the incident surface 3 of the 4 collecting function is lowered. 另一方面,本实施形态的图象显示装置1在导光板3来的射出光亮度变低的部分(离开入射面4的部分)10c处,能充分发挥棱形凸起12的聚光功能,促使光向导光板3的射出面6的法线方向射出。 On the other hand, the image display device of the present embodiment emits light at a luminance of the light guide plate 3 becomes lower portion (portion away from the incidence surface 4) at 1OC, can give full play of the prismatic projections 12 converging function, causes light emission in the normal direction of the emission surface 6 of the light guide plate 3.

因此,采用本实施形态的图象显示装置1,即使将LED5作为光源使用,也能防止因导光板3的棱形凸起12引起的异常发光,因为能用以导光板3的整体射出的均匀、明亮的面状照明光对液晶显示屏8照明,所以,显示图象明亮清晰。 Therefore, the present embodiment is an image display apparatus 1, even when used as a light source LED5, can be prevented by the projection 12 of the prism light guide plate 3 due to abnormal light emission, since the light guide plate 3 in its entirety can be uniformly emitted bright plane illumination light for illuminating the liquid crystal display 8, therefore, bright and clear display image.

上述第1实施形态在导光板3的背面10上形成棱形凸起12的形态,但也 The above-described first embodiment is formed on the light guide prism rear surface 103 of the projection 12 form, but

可以在导光板3的射出面6上形成和上述实施形态的棱开凸起12同样的棱形凸起,此外,又可以在导光板3的背面10和射出面6的两面形成与上述实施形态棱形凸起12同样的棱形凸起。 Rib may be formed and the above-described embodiment the same prismatic projections apart projections 12 on the emission surface 6 of the light guide plate 3, in addition, they may be formed on both surfaces of the above-described embodiment, the back surface 10 and emission surface 6 of the light guide plate 3 the same prism protrusions 12 prismatic projection. 在两面上形成棱形凸起时, 一个面上形成的棱形凸起也可部分地形成。 When prismatic protrusions are formed on both surfaces, the prismatic projection formed on one surface may be partially formed. 例如,在一个面上形成的棱形凸起可以只在与前述L2的范围相当的部分形成。 For example, the projections may be formed only at the relatively wide portion L2 is formed in a prismatic surface.

此外,在上述第1实施形态中,导光板3的背面10的侧面侧部分10b形成的棱形凸起12如图6所示,棱形凸起12的底部可以形成光滑的实质上呈半园形的形状,此外,如图7所示,也可以将棱形凸起12的整体形成光滑的曲面。 Further, in the first embodiment, prismatic side surface portion of the rear 10b of the light guide plate 3 is formed of projections 12 shown in Figure 6, the bottom of the prism protrusion 12 may be formed of a substantially smooth semi-circular shape shape, in addition, as shown in FIG. 7, may be prismatic projections 12 integrally formed a smooth curved surface.

此外,在上述第1实施形态,导光板3的棱形凸起12有在形成对着入射面4向正交方向延伸的情形、和从对着入射面4正交的方向开始向着倾斜几度的方向延伸的情形。 Further, in the above-described first embodiment, prism light guide plate 3 has a projection 12 formed in the case where the incident surface 4 extending in the direction orthogonal to the front, and starting from 4 facing the direction perpendicular to the incident surface inclined by several degrees toward the extending direction of the case.

此外,本发明并不限于上述第1实施形态,如图8所示,将扩散片14重迭配置在导光板3的射出面6上,还适用于将液晶显示屏8 —侧形成棱形凸起15的第1棱形片16重迭配置在扩散片14上,将形成与该第1棱形片16的棱形凸起15实质上正交的方向上向上的棱形凸起17形成的第2棱形片18重迭配置在第1棱形片16上面的形态。 Further, the present invention is not limited to the above-described first embodiment, shown in Figure 8, the diffusion sheet 14 arranged on the exit surface of the overlapped light guide plate 3 6, is also applicable to the liquid crystal display 8 - prism protrusions formed on the side prism 15 from the first prism sheet 16 overlapped on the diffuser sheet 14, the prism is formed upwardly of the first prism sheet 16 of the projection 15 is substantially perpendicular to a direction of the projection 17 is formed the second prism sheet 18 overlapping shape 16 disposed above the first prism sheet.

此外,在上述第1实施形态中,导光板3的棱形凸起12做成从导光板3 的背面10向外凸出(参照图2),但,如图9所示,可以做成棱形凸起12顶部和背面IO几乎变成同一面。 Further, in the above-described first embodiment, the light guide plate 3, the prismatic projection 12 is made from the rear surface 3 of the light guide plate 10 projecting outwardly (see FIG. 2), however, shown in Figure 9, ribs can be made shaped projection 12 and the back top IO becomes almost the same plane.

此外,上述第1实施形态列举了使用LED5作为点光源的形态,但如图10〜 图12所示,也可以使用荧光灯5A作为线状光源代替LED5。 Further, the above-described first embodiment, as exemplified using a point light source LED5 form. However, as shown in FIG. 10~ 12, a fluorescent lamp 5A may be used in place of the linear light sources LED5. 加上,如图13所示,可使用图8的面光源装置11的LED5代替荧光灯5A。 Coupled, as shown in Figure 13, using the surface light source device of FIG. 8 LED5 11 in place of the fluorescent lamp 5A. 更如图14所示,可做成使用图9所示面光源装置11的LED5代替荧光灯5A。 More As shown, LED5 can be made as shown in FIG 9 the surface light source device 11 in place of the fluorescent lamp 5A 14. 还有在图10〜图14 所示的面光源装置11上,对于和上述实施形态构成相同的构成赋以和上述实施形态同一的符号,省略和上述实施形态重复的说明。 As well as in the surface light source of FIG. 10~ 14 shown in FIG. 11, for the above-described embodiment and the same components as the above-described embodiment, and assigned with the same reference numerals, and omitting repeated description above embodiment.

这样,用荧光灯5A代替LED5的本变形例的面光源装置11和上述实施形态一样,在导光板3入射面附近棱形凸起12的聚光功能完全不能发挥,此外, 导光板3的侧面侧10b越靠近入射面4棱形凸起12的聚光功能降低,另一方面,在导光板3来的射出光亮度变低的部分(离开入射面4的部分)10c处棱形凸起12的聚光功能充分发挥。 Thus, the surface light source device according to the present modified embodiment instead of fluorescent lamp LED5 5A 11 and, like the above embodiment, the condensing function of the projections 12 of the light guide plate 3 near the prism incident surface can not fully exert, in addition, the side surface side of the light guide plate 3 10b closer to the incident plane 4 prismatic projections 12 of the condensing function decreases, on the other hand, in the brightness of light emitted by the light guide plate 3 becomes lower portion (portion away from the incidence surface 4) of the prismatic protrusion 10c 12 condensing fully functioning. 其结果,导光板入射面附近10a及侧面侧部 As a result, the light guide plate 10a and a side near the incident surface side portion

分10b的明暗差不易产生,从导光板上下边缘4A、 4B射入的光产生的亮线、 The difference in brightness points 10b less likely to occur, the upper and lower edges of the light guide plate is incident from the bright line of light generated 4A, 4B,

或导光板3入射面4附近的射出面6的两端产生的低亮度部分变得不显眼。 Low brightness or both of the emission surface 6 of the light guide plate 3 near the incidence surface 4 produced becomes inconspicuous.

因此,采用本变形的图象显示装置1,尽管使用荧光灯5A作为光源,仍能防止因导光板3的棱形凸起引起的异常发光,能以从导光板3全体射出的均匀、 明亮的面状照明光照亮液晶显示屏8,故显示图象明亮清晰。 Accordingly, this modification of the image display apparatus 1, although the fluorescent lamp 5A as a light source, still preventing the abnormal light emitting light guide plate 3 due to the prismatic projections caused from the light guide plate 3 can be uniformly emitted from all of the bright surface illumination light illuminates the liquid crystal display 8, so that bright and clear display image. [第2实施形态] [Second Embodiment]

图15A、图15B及图16A〜图16D表示第2实施形态。 FIG. 15A, 15B and FIG 16A~ 16D shows the second embodiment. 其中,图15A表示从导光板3射出面6 —侧看到的平面图、图15B表示图15A的XVB — XVB线剖视图、图16A表示图15B的XVIA—XVIA线剖视图、图16B表示图15B的XVIB 一XVIB线剖视图、图16C表示图15B的XVIC —XVIC线剖视图、图16D表示图15B的XVID — XVID线剖视图。 Wherein FIG. 15A shows the three exit face of the guide 6 - plan view of the side of the saw, 15A of XVB 15B shows FIG - XVB line cross-sectional view, FIG. 16A shows FIG XVIA-XVIA line 15B is a sectional view, XVIB of FIG. 16B shows FIG. 15B a sectional view along line XVIB, FIG. 15B to FIG 16C shows a cross-sectional view of the line XVIC -XVIC, 15B, 16D shows XVID - XVID line cross-sectional view.

如上述诸图所示,导光板3和前述第1实施形态的导光板3—样,为离入射面4一侧越远板厚越薄、断面实质上呈楔形的形状,并且形成平面形状实质上呈矩形。 As shown in the figures described above, the light guide plate 3 and the first embodiment of the light guide plate-like 3-, 4 from the side of the incident surface is farther thinner thickness, a substantially wedge-shaped cross-sectional shape and a planar shape of the substance the rectangular. 而且,导光板3在其背面10侧的整个面上形成棱形凸起23之同时, 在其射出面6并从入射面4起在规定的范围内形成棱形凸起24。 Further, the light guide plate 3 is formed of a prismatic projection 23 while the entire surface of the back side 10 thereof, and in which the emission surface 6 are formed within a predetermined range from the incidence surface 4 from the prism protrusions 24. 这些棱形凸起23、 24都在与入射面4实质上呈正交的方向上延伸,并沿入射面4平行地形成多条。 These prism protrusions 23, 24 extend in a direction orthogonal to the incident surface was substantially 4, and is formed along the incidence surface 4 a plurality of parallel. 这里,所谓规定范围为从图15A及图15B所示导光板3的入射面4至P1 点为止的范围,设导光板3的入射面4侧的板厚为(T),则为离入射面4约20 (T)的范围。 Here, the predetermined range is from FIGS. 15A and 15B, the range until the incident surface 4 of the light guide plate 3 to point P1, the light guide plate 3 side of the incidence surface 4 of the plate thickness (T), was removed from the incident surface 4 range from about 20 (T) of the.

导光板3背面10侧的棱形凸起23从离开入射面4规定尺寸的位置(Po) 开始至导光板3的端部(导入射面4相反一侧的侧面22)的范围上,形成同一高度并同一形状(实质上呈三角形)(参照图16D)。 Over a range of prismatic light guide plate 310 back surface side of the projection 23 from the start position (Po) leaving a predetermined size of the entrance surface 4 of the guide plate to the end portion (4 introducing emitting surface opposite to the side surface 22) 3, is formed in the same the same height and shape (substantially triangle) (see FIG. 16D).

此外,导光板3背面10侧的棱形凸起23和图15B所示,形成从离开入射面4规定尺寸的位置(Po)开始朝着入射面4凸起高度逐渐降低。 In addition, the back surface side of the prism 310 and the light guide plate 15B, protrusions 23 are formed from a start position (Po) leaving a predetermined size of the entrance surface 4 of the projection height gradually decreases toward the incidence surface 4.

这里,图16A〜图16D表示沿图15B的XVIA—XVIA线〜XVID—XVID线切断的导光板3的局部放大剖视图。 Here, FIG. 16D shows 16A~ along the line XVIA-XVIA ~XVID-XVID cutting line 15B of the light guide plate 3 is a partially enlarged cross-sectional view. 如上述诸图所示,在导光板3的背面10顶lj, 离入射面4规定尺寸的位置(Po)处棱形凸起23、 24间的沟形为实质上呈三角形(参照图16D),但随着向入射面4各棱形凸起23、 24间的沟深逐渐减小并且其沟的形状从实质上呈三角形光滑地变化成实质上呈园弧形。 As shown in the figures described above, the back surface of the light guide plate 10 lj 3, 4 from the position of the predetermined size incident surface (Po) of the prism-shaped raised channel 23, 24 is substantially triangular (see FIG. 16D) , but with groove depth projections 23, 24 of each of the prism 4 to the incident surface and the shape of the groove gradually decreases from a substantially triangular shape is smoothly changed to a substantially circular arc shape.

导光板3射出面6侧的棱形凸起24如图15B所示,从离入射面4规定尺寸的位置(Pl)开始向着入射面4形成凸起高度逐渐增加,棱形凸起24断面 Prismatic light guide plate 3 side of the emission surface 6 of the protrusion 24 shown in FIG. 15B, toward the incidence surface 4 is formed beginning from a position away from the incidence surface 4 of a predetermined size (Pl is) increasing the height of the projection, the projection 24 of prismatic section

形状如图16A〜图16C所示,棱形凸起24间的沟形呈现实质上园弧形稍呈波形的形状。 As shown in FIG. 16C 16A~ shape, prism-shaped grooves between the projections 24 presents a substantially circular arc shape of the waveform is slightly.

又如图16A〜图16D所示,导光板3的射出面6傻lj,从离入射面4规定尺寸的位置(Pl)至前端侧的侧面22为未被形成棱形凸起的平面(参照图16D)。 Another example is shown in FIG. FIG 16A~ light guide plate emission face 6 silly lj 3 from the incidence surface 4 from the position of a predetermined size (Pl is) to the front end side of the side surface 22 is not formed flat prismatic projection (refer to 16D FIG. 16D). 换言之,导光板3的射出面6从位置(Pl)至侧面22形成平面,另一方面, 以位置(Pl)为起点向着入射面4刻出徐徐变深、断面实质上呈园弧形的沟, 形成相对凸起高度逐渐增高的棱形凸起24。 In other words, the emission surface 6 of the light guide plate 3 to the side surface 22 is formed from a flat position (Pl is), on the other hand, the position (Pl is) as the starting point toward the incidence surface 4 gradually becomes deeper engraved, cross-sectional shape substantially circular arc groove , the relative height of the projections is formed of prism protrusions 24 gradually increases.

在本实施形态,形成导光板3背面10侧的棱形凸起23从离入射面4规定尺寸的位置(PO)向入射面4凸起高度逐渐降低的形状,和前述第l实施形态l一样,抑制导光板3入射面4侧的棱形凸起23的聚光功能,虽然设法使以前成为问题的亮线H (参照图40)不引人注目,但,在本实施形态中,还通过随着向入射面4将棱形凸起23间的沟形从实质上呈三角形光滑地变化成实质上呈园弧形,从而能使亮线H更加不引人注目。 In this embodiment, prism 310 formed in the back surface side of the light guide plate 23 is gradually raised from the lowered position away from the incidence surface 4 of a predetermined size (PO) 4 to the height of the convex shape of the incident surface, and the second embodiment, l l as , prismatic light guide plate 3 to suppress the incident surface 4 side of the projection 23 of the light condensing function, although the problem previously managed to bright lines H (see FIG. 40) are not noticeable, but, in the present embodiment, through with the raised channel shaped incident surface 23 to the prism 4 will vary smoothly from substantially triangular shape to a substantially circular arc, so that bright lines H can be more inconspicuous. 可以认为这是通过取棱形凸起23 间的沟形为实质上呈园弧形,其部分起着宛如凹透镜的作用,到达界面的光扩大的反射、折射,通过发挥光扩散功能,从而不易产生亮线。 This is considered by taking the gutter-prismatic projection 23 is a substantially circular arc shape, which is concave portion plays a role like, light reaching the reflection interface expanded, refracted light diffusing function by playing so easily bright line.

此外,本实施形态中,导光板3射出面6侧形成的凸起24也期待能形成同样的光扩散功能,用和导光板3的背面侧10形成的棱形凸起23的组合,能更有效防止亮线H的发生。 Further, in this embodiment, the light guide plate 3 side of the emission surface 6 are formed projections 24 can be formed also expect the same light diffusing function, a combination of the projections 23 with the prismatic light guide plate 3 and the back side 10 is formed, more effectively prevent bright lines H.

这里,在只用导光板3背面10侧形成的棱形凸起23能充分满足实用的场合,导光板3射出面6侧形成的棱形凸起24择需也可省略。 Here, the prism formed with only the back surface 10 side of the light guide plate 3 projections 23 can fully meet practical case, prismatic light guide plate 3 formed on the emission surface 6 side for an optional protrusion 24 may be omitted. 即上述棱形凸起24在上述棱形凸起23的亮线防止效果不充分的场合,应辅助其而设置。 I.e. prismatic projection 24 above the projection 23 of the bright line preventing effect is not sufficient in the case of the above-described prismatic, which should be provided assistance. 根据上述观点,上述棱形凸起24在前述第1实施形态中,也能为和导光板3背面10侧形成的样态所示的棱形凸起24在将以往所知的背面等作部分表面粗糙化相等构成的导光板上,也能适用于在将LED用作光源时防止光源附近亮度不均的对策。 View of the above, in the above-described prismatic projections 24 of the first embodiment, the projections 24 can be known in the back surface of a conventional prismatic portion or the like as shown in FIG. 3 and the like state in the rear surface side of the light guide plate 10 is formed surface roughening on the light guide plate composed of equal, can be applied to a countermeasure against uneven brightness near the light source when the LED is used as a light source. 此外,上述第2实施形态例举了作为点光源使用LED5的形态,但如图17A及图17B所示,也可做成作为线状光源使用荧光灯5A代替LED5。 Further, the second embodiment exemplifies LED5 used in the form of point light source, but shown in FIGS. 17A and 17B, the fluorescent lamp 5A may be made instead of the linear light sources LED5. 还有, 在图17A及图17B所示的面光源装置11上,对于和上述第2实施形态构成相同的构成赋以与第2实施形态同一符号,省略和第2实施形态重复和说明。 Further, in FIGS. 17A and 17B on the surface light source device shown in FIG. 11, for the above-described second embodiment and the same components assigned with the same reference numerals to the second embodiment, the second embodiment will be omitted and explanation and repeated.

这样,荧光灯5A替代LED5的本变形例的面光源装置11和上述第2实施形态一样,通过导光板3背面10侧的棱形凸起随着向入射面4凸起高度逐渐降低,从而抑制棱形凸起23的聚光功能,又通过将棱形凸起23间的沟形做成 Thus, the fluorescent lamp 5A LED5 alternative surface light source device 11 according to the present modified embodiment and the second embodiment, as with the height gradually decreases toward the projection 4 through the prism incident surface of the back surface side of the light guide plate 310 projection, thereby suppressing rib shaped projection 23 of the condensing function, but also by the projections 23 of the prism-shaped grooves made

实质上呈园弧形,因棱形凸起23间的沟能发挥光扩散功能,故能使入射面4 上下边缘4A、 4B射入的光引起的亮线、导光板3入射面4侧两端的低亮度部分不引人注目。 A substantially circular arc shape, prismatic projection grooves 23 due to the play of light diffusing function, it can make the upper and lower edge 4 incident surface 4A, 4B of the incident light due to the bright line, the incident surface of the light guide plate 3 4 side two low-luminance part of the end unobtrusive.

本变形例中,导光板3射出面6侧形成的棱形凸起24期待形成和上述第2 实施形态面光源装置11同样的光扩散功能,以和导光板3背面10侧形成的棱形下起的组合,能更有效地防止亮线的发生。 Modification of the present embodiment, the prism light guide plate 3 side of the emission surface 6 are formed protrusions 24 are formed and said look the same light diffusing function 11 of the second embodiment of the surface light source device 10 to the back surface side of the prism and the light guide plate 3 is formed at from combination, can more effectively prevent the occurrence of bright lines.

[第3实施形态] [Third Embodiment]

图18A〜图18D表示本发明第3实施形态的及的导光板3,表示第2实施形态所示导光板3的其它实施形态。 FIG 18A~ FIG. 18D showing a third embodiment of this invention and the light guide plate 3, showing another embodiment of the light guide plate 3 in the second embodiment shown in FIG. 这里,图18A表示从导光板3射出面6侧看到的平面图、图18B表示图18A的XVfflB — XVllB线剖视图、图18C表示图18A 的XVfflC — XVIIlC线剖视图、图18D表示图18A的XV11D —XV1D线剖视图。 Here, FIG 18A shows a plan view seen from the 3 exit 6 side face of the guide, XVfflB FIG. 18B shows FIG. 18A - XVllB line cross-sectional view, FIG. 18C showing FIG. 18A XVfflC - XVIIlC line cross-sectional view, FIG. 18D showing XV11D FIG. 18A - XV1D line cross-sectional view. 还有, 所谓XVIDB —XWIB线剖视图、XVBIC —XVIIC线剖视图、XMD —XMD线剖视图,如图22所示,表示垂直于导光板3的射出面6的面PL,称为用通过棱形凸起间的沟底部的面PL切断的断面。 There, the so-called sectional view along line XVIDB -XWIB, XVBIC -XVIIC line cross-sectional view, XMD -XMD line cross sectional view shown in Figure 22, PL denotes a plane perpendicular to the exit surface 6 of the light guide plate 3 is referred to by a prismatic projection PL between the bottom surface of the groove cut section.

如上述诸图所示,导光板3和第1〜第2实施形态的导光板3—样,为离入射面4越远板厚变薄、断面实质上呈楔形的形状,并形成平面形妹实质上呈矩形。 As shown in the figures above, 1 ~ 3 and the second embodiment of the light guide plate-like light guide 3-, as farther away from the incidence surface 4 thin thickness, a substantially wedge-shaped cross section, and is formed planar sister essentially rectangular. 而且,导光板3在其背面10侧的整个面上形成棱形凸起20之同时,其射出面6并从入射面4起在规定范围内形成棱形凸起21这些棱形凸起20、 21 都在与入射面4实质上正交方向上延伸,并沿入射面4平行形成多条。 Further, the light guide plate 3 is formed on the entire surface of the prism 10 which the back surface side of the projection 20 at the same time that the emission surface 6 and the prism protrusions 21 from the incident surface 4 is formed in a predetermined range from the prism protrusions 20, 4 21 extend in the direction substantially perpendicular to the incident surface, and forming a plurality of parallel along the incidence surface 4. 这里, 所谓规定范围为图18A〜图18D所示导光板3入射面4起至P1点止的范围,设导光板3的入射面4侧的板厚为(T),则为离入射面4约20 (T)的范围。 Here, the predetermined range is a range shown in FIG. 4 18A~ until the stop point P1 incident surface of the light guide plate 3, the light guide plate 4 side incident surface 18D having a thickness of 3 (T), was removed from the incident surface 4 range from about 20 (T) of the.

导光板3背面10侧的棱形下起20在光轴方向上从离入射面4规定尺寸的位置(PO)至导光板3的前端(入射面4和相反一侧的侧面22)的范围内,形成同一高度并同一形状(实质上呈三角形)(参照图19D、图20D、图21D)。 The guide plate 20 to the distal end (opposite to the incident surface 4 and the side face 22) in the range of 3 prism back surface side of the light guide plate 310 in the optical axis direction from the position away from the incidence surface 4 of a predetermined size (PO) is formed at the same height and the same shape (substantially triangle) (see FIG. 19D, FIG. 2OD, FIG. 21D).

此外,又为导光板3背面10侧的棱形下起20, LED5光轴La上的棱形下起20如图18B所示,做成从离入射面4规定尺寸的位置(PO)起向着入射面4 下起高度逐渐降低。 In addition, also for the back surface side of the prism 310 from the light guide plate 20, since the prism 20 in FIG. 18B LED5 on the optical axis La as shown, it is made from the position away from the incidence surface 4 of a predetermined size (PO) towards since the height of the incident surface 4 gradually decreases. 这里,所谓光轴La如图18A所示,为通过LED5中心的线, 与入射面4正交的线。 Here, the optical axis La as shown in FIG. 18A, a line through the center of LED5, 4 and perpendicular to the incident surface of the line.

这里,图19A〜图19D表示沿图18B的XIXA — XIXA线〜XIXD — XIXD线切断的导光板3的局部放大剖视图。 Here, FIG. 19D showing 19A~ FIG. 18B XIXA along - line XIXA ~XIXD - XIXD cut line partially enlarged cross-sectional view of the light guide plate 3. 如上述各图所示,在导光板3背面10侧, 从入射面4开始在光轴方向上离规定尺寸的位置(PO)处,棱形凸起20、 20间的沟形为实质上呈三角形(参照图19D),但随着向入射面4各棱形下起20、 20间的沟深逐渐减低并且其沟形从实质上呈三角形光滑地变化成实质上呈园弧形。 As shown in the figures described above, in the back surface 10 side of the light guide plate 3, 4 starts off from the incident surface in the optical axis direction position of a predetermined size (PO), the prism-shaped raised channel 20, 20 is in substantially triangle (see FIG. 19D), but reduced gradually as the groove depth from 20, 20 to the incident surface 4 of each prismatic-shaped groove and which smoothly changes from a substantially triangular shape to a substantially circular arc.

此外,导光板3背面10侧的棱形下起20并入射面4附近棱形下起20在相邻LED5、 5间的中间位置及导光板3的宽度方向(如图18A所示,与光轴La 正交方向)的两端做成凸起高度最高,在宽度方向上也使凸起高度变化。 Further, since the prism 3 side of the light guide plate 10 near the back surface 20 and the incident surface 20 from the prism 4 adjacent LED5, 5 and the intermediate position between the light guide plate 3 in the widthwise direction (FIG. 18A, and light La orthogonal to the axial direction of both ends) of the protrusion maximum height is made, in the width direction also changes the height of the projections. 艮P, 本实施形态中,如图18C及图18D所示,导光板3背面10侧棱形凸起20的凸起高度从位置(PO)朝着入射面4逐渐降低,其后变成一定,凸起高度变成一定的范围做成在宽度方向上离光轴越远亦越大,在相邻LED5、 5间的中间位置及导光板3的宽度方向两端部最大,与凸起高度的变化部分(第3部分)和凸起高度的一定部分(第4部分)的交点Pa的轨迹(在图18A上用虚线表示的曲线M1)和入射面4所围的范围相对应。 Gen P, according to the present embodiment, as shown in FIG. 18C and FIG. 18D, the back surface 10 side of the prism light guide plate 3 protrusion height of the projection 20 gradually decreases from the position 4 (PO) toward the incident surface, and thereafter becomes constant , the height of the projection becomes a certain range is made larger the farther away from the optical axis is also in the width direction, the adjacent LED5, light guide plate 5 and the intermediate position between the widthwise end portions 3 of the maximum, and the height of the projections a change section (section 3), and a certain height of the convex portion (part 4) of the intersection Pa locus (curve M1 shown in FIG. 18A by a broken line) and the range surrounded by the incidence surface 4, respectively. 还有,导光板3背面IO侧棱形凸起20上,凸起高度一定的部分为交点Pa至入射面4的部分(第3部分)、和位置PO开始至侧面22的部分(第5部分)。 Further, the light guide plate 3 IO back surface side of the prismatic projections 20, the projections certain section (section 3) to the height of the portion of intersection Pa of the incidence surface 4, and the position PO to the beginning of the side portion 22 (Part 5 ).

这里,图20A〜图20D表示沿图18C的XXA—XXA线〜XXD—XXD线切断的导光板3的局部放大剖视图。 Here, FIG. 20D shows 20A~ along the line XXA-XXA line 18C ~XXD-XXD cutting the light guide plate 3 is a partially enlarged cross-sectional view. 如上述各图所示,导光板3背面10侧上,从入射面4在光轴方向离规定尺寸的位置(PO)处棱形凸起20、 20间的沟形为实质上呈三角形(参照图20D),随着从位置(PO)开始向入射面4各棱形凸起20、 20间的沟深逐渐降低并其沟形从实质上呈三角形光滑变化成实质上呈园弧形(参照图20B〜图20C),从图18C的交点Pa开始入射面4侧形成凸起高度为一定的棱形凸起20、 20 (参照图20A)。 As shown in the figures described above, the rear surface 310 side of the light guide 4 from a predetermined size from the incident surface in the optical axis direction position (PO) of the prism-shaped raised channel 20, 20 is substantially triangular (see FIG 2OD), with the start of the projections Goushen 20, 20 from the position (PO) to 4 each prism incident surface and gradually decreases from its gutter-smooth changes into a substantially triangular shape substantially circular arc (see FIG 20B~ FIG. 20C), starts from the incident surface 4 side of the intersection Pa in FIG 18C formed protrusion height constant prismatic projections 20, 20 (see FIG. 20A).

此外,图21A〜图21D表示沿着图18D的XXIA —XXIA线〜XXID—XXID线切断的导光板3的局部放大剖视图。 Further, FIG. 21D showing FIG 21A~ taken along the line XXIA -XXIA ~XXID-XXID of FIG line 18D the light guide plate 3 is a partial enlarged cross-sectional view. 如上述各图所示,在导光板3背面10侧从入射面4起在光轴方向离规定尺寸的位置(P0)处棱形凸起20、 20间的沟形为实质上呈三角形(参照图21D),随着位置(P0)起朝入射面4各棱形下起20、 20间沟深逐渐降低并其沟形从实质上呈三角形光滑变化成实质上呈园弧形(参照图21C),从图18D的交点Pa起入射面4侧处形成凸起高度为一定的棱形凸起20 (参照图21B〜图21A)。 As shown in the figures described above, in the light guide plate 3 from the back surface 10 side from the incidence surface 4 from the predetermined size in the optical axis direction position (P0) of the prism-shaped raised channel 20, 20 is substantially triangular (see FIG. 21D), as the starting position (P0) groove depth gradually decreased from 20, 20 toward the incidence surface 4 and the respective prismatic-shaped groove which is substantially smooth change from a substantially triangular shape to a circular arc (see FIG. 21C ), the height of the projections is formed from the side of the incident surface 4 from the intersection Pa in FIG. 18D is a constant prismatic projections 20 (see FIG. 21B~ FIG. 21A).

这里,图19A、图20A及图21A的导光板3背面10侧上,棱形凸起20依图19A、图20A、图21A的棱形凸起20的次序凸起高度增加,宽度方向上凸起高度光滑变化。 Here, FIG. 19A, on the rear surface 310 side of the light guide plate 20A and 21A, the prism protrusions 20 according to FIG. 19A, 20A, 21A of FIG prismatic projections 20 of the order of increasing height projections, projecting in the width direction since the height of the smooth change. 在导光板3射出面6侧的棱形凸起21处,LED5光轴La上的棱形凸起21 如图18B所示,形成从离入射面4规定尺寸的位置(Pl)向入射面4凸起高度逐渐增高,形成从P6点至入射面4为止的凸起高度为一定。 Prismatic light guide plate 3 in the side of the emission surface 6 of the protrusion 21, LED5 on the optical axis La prism protrusions 21 shown in FIG. 18B, is formed from a position away from the incidence surface 4 of a predetermined size (Pl is) to the incident plane 4 the projection height gradually increased until the height of the projections formed from the point to the incident surface 4 P6 constant.

在导光板3射出面6侧的棱形凸起21处,LED5光轴La上的棱形凸起21 如图18B所示,形成从离入射面4规定尺寸的位置(Pl)向入射面4凸起高度逐渐增高,形成从P6点至入射面4为止的凸起高度为一定。 Prismatic light guide plate 3 in the side of the emission surface 6 of the protrusion 21, LED5 on the optical axis La prism protrusions 21 shown in FIG. 18B, is formed from a position away from the incidence surface 4 of a predetermined size (Pl is) to the incident plane 4 the projection height gradually increased until the height of the projections formed from the point to the incident surface 4 P6 constant.

这里,图19A〜图19D表示沿图18B的XIXA—XIXA线〜XIXD—XIXD线切断的导光板3的局部放大剖视图。 Here, FIG. 19D showing 19A~ FIG along lines XIXA-XIXA ~XIXD-XIXD cutting line 18B of the light guide plate 3 is a partially enlarged cross-sectional view. 如上述各图所示:在导光板3射出面6侧, 从光轴方向上离入射面4规定尺寸的位置(Pl)起至前端侧的侧面22为没有形成棱形凸起21的平面(参照图19D),从位置(Pl)向入射面4至P6点形成棱形凸起21的高度逐渐增高,从P6点至入射面4形成棱形凸起21的高度为一定。 As shown in the above FIG: 3 in the light guide plate emission face 6 side, the size of the position (Pl is) until the distal side of the side surface 22 is not formed from the incidence surface 4 from the optical axis direction of the predetermined plane of the prismatic projections 21 ( Referring to FIG. 19D), formed from a position (Pl is) to the incident surface 4 to point P6 height of the prismatic projection 21 is gradually increased, the point P6 is formed from the prism 4 to the incident surface 21 of the protrusion height constant. 这里,导光板3射出面6侧的棱形凸起21的断面形状如图19A〜图19C所示,棱形凸起21的断面形状如图19A〜图19C所示,棱形凸起21间的沟形为呈现实质上园弧形的稍作波形的形状。 Here, the prism light guide plate 3 side of the emission surface 6 of the protrusion 21 is shown in cross-sectional shape as shown in FIG. 19C 19A~ prismatic convex cross-sectional shape 21 is shown in FIG. 19C 19A~, prismatic projections 21 groove shaped to present a substantially circular arc shape of the waveforms slightly.

此外,导光板3射出面6侧的棱形凸起21并入射面4附近的棱形凸起21 做成相邻LED5、 5间的中间位置及导光板3的宽度方向两端处凸起高度最高, 在宽度方向上也使凸起高度变化。 Further, the prism light guide plate 3 side of the emission surface 6 of the prismatic projections 21 and the vicinity of the incidence surface 4 adjacent projections 21 made LED5, an intermediate position and the light guide plate 5 at both ends of the width direction of the height of the projections 3 the highest, in the width direction also changes the height of the projections. 即,本实施形态中,如图18B及图18C所示, 做成在导光板3射出面6侧棱形凸起21的凸起高度为一定的范围内在宽度方向上离光轴La越远就越小,该导光板3射出面6侧棱形凸起21的凸起高度在一定的范围内相邻LED5、 5间的中间位置及导光板3宽度方向两端部大致变成零。 That is, in this embodiment, as shown in FIG. 18B and FIG. 18C, 3 made in the light guide plate emission face 6 side of the prismatic protrusion height of the protrusion 21 is farther from the optical axis La on a certain range of the width direction of the inner the smaller, the emission surface 6 side of the light guide plate 3 protrusion height of the prism protrusions 21 adjacent LED5 within a certain range, the light guide plate 5 and the intermediate position of the both widthwise end portions 3 becomes substantially zero. 换言之,导光板3射出面6侧棱形凸起21的高度为一定的范围是凸起高度的变化部分(第2部分)和凸起高度一定的部分(第1部分)的交点P6的轨迹(图18A中以细线表示的曲线M2)和入射面4所围的范围。 In other words, the emission surface 6 side of the light guide plate 3 the height of prism protrusions 21 is constant variation in the height range is convex portion (Part 2) and a certain height of the convex portion (Part 1) of the intersection point P6 locus ( FIG. 18A curve M2 shown by thin lines) and a range surrounded by four incident surface.

这里,图20A〜图20D表示沿图18C的XXA—XXA线〜XXD—XXD线切断的导光板3的局部放大剖视图。 Here, FIG. 20D shows 20A~ along the line XXA-XXA line 18C ~XXD-XXD cutting the light guide plate 3 is a partially enlarged cross-sectional view. 如上述各图所示,在导光板3的射出面6侧,在入射面4至P6点的范围形成棱形凸起21为一定高度(参照图20A) , P6点至位置(Pl)的范围形成棱形凸起21的高度逐渐减低(参照图20B〜图20C)。 As shown in the figures described above, the emission surface 6 side of the light guide plate 3, prism is formed in the range of 4 to P6 incident surface protrusion point 21 is a height (refer to FIG 2OA), the range of the point P6 to a position (Pl is) of the height of prism protrusions 21 are formed is gradually reduced (see FIG 20B~ FIG. 20C). 还有,如图20A〜图20C所示,棱形凸起21的断面形状形成相邻的棱形凸起21、 21间的沟形变成实质上呈园弧形,呈现稍作波形的形状。 Also, as shown in FIG. 20C 20A~ prismatic projection 21 is formed adjacent to the cross-sectional shape of the prism protrusions 21, 21 into the groove shaped substantially circular arc shape, the waveform exhibits little shape .

此外,图21A〜图21D为表示沿图18D的XXIA —XXIA线〜XXID —XXID线切断的导光板3的局部放大剖视图。 Further, FIG. 21D is a 21A~ FIG along line XXIA -XXIA ~XXID -XXID line 18D partially cutting the light guide plate 3 is an enlarged cross-sectional view. 如上述各图所示:导光板3射出面6侧, As shown in the above drawings: emission surface 6 side of the light guide plate 3,

棱形凸起21形成从位置(Pl)随着向入射面4使凸起高度逐渐增高。 Prismatic projection 21 is formed from a position (Pl is) so as to the height of the convex incident surface 4 is gradually increased. 还有, and also,

如图图21A〜图21D所示,棱形凸起21断面形状形成相邻的棱形凸起21、 21 间的沟形变成实质上呈园弧形状,呈现稍作波形的形状。 As shown in FIG 21A~ FIG. 21D, the prism protrusions 21 formed adjacent to the cross-sectional shape of the prism protrusions 21, 21 into the groove shaped substantially as a circular arc shape, assumes the shape of a little wave.

这里,图19A、图20A、图21A导光板3的射出面6侧,棱形凸起21依图19A、图20A、图21A的棱形凸起21的次序凸起高度增高,和导光板3背面10 侧同样,在导光板3宽度方向上,凸起高度光滑地变化。 Here, FIG. 19A, 20A, FIG. 21A emission surface 6 side of the light guide plate 3, prism protrusions 21 according to FIG. 19A, 20A, 21A of FIG prismatic projections 21 of the order of increasing bump height, and the light guide 3 Similarly the back surface 10 side, in the width direction of the light guide plate 3, the height of the projections vary smoothly.

采用上述构成的本实施形态的导光板3,能抑制从作为点光源的LED5附近的射出光,促使来自LED5、 5间或宽度方向两端部的易变暗区的部分的光射出, 使射出面整体的亮度均一,以前成为问题的亮线H (参照图40)能更不显眼。 According to this embodiment the configuration of the light guide plate 3, light emitted can be suppressed from the point light source as close to LED5, prompting from LED5, the light emitting portion easily darkened region 5 or both end portions in the width direction, so that the exit surface overall brightness uniform, bright lines H before the problem becomes (see FIG. 40) can be more inconspicuous. 其结果,使用本实施形态的导光板3的面光源装置11能明亮均一的面照明。 As a result, the present embodiment using the light guide plate 11 of the surface light source device 3 can be a uniform bright surface illumination. 此外,使用本实施形态导光板3的图象显示装置1能实现显示品质的高质量。 Further, the image light guide plate 3 in this embodiment using the display apparatus 1 can realize high display quality.

还有,本实施形态中,P0、 Pl、 Pa、 Pb各点根据导光板3大小、导光板3 入射面4侧的板厚(T)、相邻LED5、 5间隔等可适当变化。 Further, in this embodiment, P0, Pl,, Pb may be suitably changed points Pa size light guide plate 3, the thickness (T) the light guide plate 3 side of the incidence surface 4, adjacent accordance LED5, 5 intervals and the like. 但是,是为了照明手机的液晶显示装置等使用的导光板,在射出面6的面积比个人电脑的液晶监视器用导光板小的导光板的场合,经实验确认取P0、 Pl的位置几乎为20T 是有效的。 However, the light guide plate is used for an illumination device or the like of the mobile phone liquid crystal display, the area of ​​the emission surface 6 of the light guide plate is smaller than a personal computer where the liquid crystal monitor light guide plate, taken experimentally confirmed P0, the position is almost Pl 20T It's effective.

(第3实施形态的变形例) (Modification of third embodiment)

上述第3实施形态列举了使用LED5作为点光源的例子,如图23A〜图23D 所示,也可将荧光灯5A作为线状光源代替LED5使用。 The above-described third embodiment shows example LED5 as a point light source, as shown in FIG. 23D 23A~ can also be replaced by a linear light source as a fluorescent lamp 5A LED5 use. 还有,在图23A〜图23D 所示的面光源装置11上,对和上述第3实施形态构成同一构成赋以和第3实施形态同一符号,省略和第3实施形态重复的说明。 Further, in the surface light source device illustrated in FIG 23A~ FIG 23D 11, configured and assigned to the third embodiment the same reference numerals, and omitting the third embodiment and repeated description of the third embodiment is configured the same.

导光板3背面10侧的棱形凸起20从光轴方向上离入射面4规定尺寸的位置(P0)至导光板3的前端(入射面4和相反一侧的侧面22)的范围内做成同一高度并同一形状(实质上呈三角形)(参照图19D、图20D、图21D),这里, 所谓光轴方向,如图23A所示,为对荧光灯5A长度方向正交的方向,与入射面4正交的方向。 310 back surface side of the prism light guide protrusion 20 position (P0) from a predetermined size of the incidence surface 4 from the optical axis direction to make the range of the light guide plate (opposite to the incident plane 4 and the side face 22) of the front end 3 into the same height and the same shape (substantially triangle) (see FIG. 19D, FIG. 2OD, FIG. 21D), here, the optical axis direction, as shown, the direction orthogonal to the longitudinal direction of the fluorescent lamp 5A, FIG. 23A incident 4 a direction perpendicular to a plane.

此外,导光板3背面10侧的棱形凸起20,从荧光灯A的端面至仅离开距离Lb的端部附近的棱形凸起20,如图23B所示,将离入射面4规定尺寸的位置(P0)作为起点,形成从该位置起向入射面4使凸起高度逐渐降低。 In addition, the back surface side of the prism 310 the light guide plate boss 20, from the end A to the fluorescent prismatic only near the end away from the Lb of the projection 20, as shown in FIG. 23B, the predetermined size from the incidence surface 4 of the position (P0) as a starting point, the height of the protrusion is formed so that the incident surface 4 gradually decreases from this position.

这里,沿图23B的XIXA — XIXA〜XIXD —XIXD线切断表示导光板3的局部放大剖视图和图19A〜图19D相同。 Here, FIG. 23B along XIXA - XIXA~XIXD -XIXD cutting line represents the light guide plate 3 is an enlarged partial cross-sectional view of the same and 19A~ FIG 19D. 如上述各图所示,导光板3的背面10侧, As shown in the above drawings, the back surface 10 side of the light guide plate 3,

从光轴方向上离入射面4规定尺寸的位置(PO)处棱形凸起20、 20间的沟形 4 from the position of a predetermined size from the incident surface of the optical axis (PO) at a prism-shaped raised channel 20, 20 of

实质上呈三角形(参照图19D),随着向入射面4各棱形凸起20、 20间的沟深逐渐降低并其沟形从实质上呈三角形光滑变化成实质上呈园弧形。 A substantially triangular (see FIG. 19D), with the groove depth projections 20, 20 of each of the prism 4 to the incident surface and gradually decreases from its substantially triangular shaped groove is changed to a substantially smooth circular arc shape.

此外,导光板3背面10侧的棱形凸起20并入射面4附近的棱形凸起20 做成导光板3的宽度方向(如图23A所示,沿入射面4的方向)的两端部凸起高度最高,宽度方向上也使凸起高度变化。 In addition, the back surface side of the prism 310 the light guide plate 20 and the incident surface of prismatic projections 4 made of the light guide plate 20 near the projections 3 in the width direction (FIG. 23A, the direction of the incident surface 4) at both ends the maximum height of the projection portion, but also the change in bump height in the width direction. 即,在本变形例中,如图23C及图23D所示,导光板3背面10侧棱形凸起20的凸起高度从位置(PO)起向着入射面4逐渐降低,其后成一定。 That is, in this modification, as shown in FIG. 23C and FIG. 23D, 3 the back surface 10 side of the prism light guide protrusion height of the protrusion 20 of the incident surface 4 gradually decreases from the position (PO) towards the starting and thereafter to a constant. 而且,凸起高度成一定的范围形成从荧光灯5A 的端部附近起沿着向荧光灯5A的两端的方向增大,导光板3宽度方向两端部处最大。 Further, the projection height is increased into a certain range is formed from the vicinity of the end portion of the fluorescent lamp 5A toward both ends in the direction of the fluorescent lamp 5A, the light guide plate 3 at the both widthwise end portions maximum. 该导光板3背面10侧的棱形凸起20为其凸起高度变化部分(第3部分)和凸起高度一定部分(第4部分)的交点Pa的轨迹(图23中以虚线表示的曲线M3)所围的入射面4侧的角部。 3 the back surface side of the prism 10 of the light guide plate 20 to its convex protrusion height variation section (section 3) and a constant height of the convex portion (part 4) of the locus of the intersection Pa (23 in FIG curve indicated by a broken line M3) surrounded by the corner portions of the incident surface 4 side. 还有,导光板3背面IO侧的棱形凸起20中,凸起高度一定的部分为交点Pa至入射面4的部分(第3部分)和位置P0至侧面22的部分(第5部分)。 Further, the prism 3 side of the back surface of the light guide plate IO protrusion 20, the protrusion (Part 3) and the position P0 to the side portion 22 (Part 5) the height of certain portions Pa to the intersection of the incidence surface 4 .

这里,沿图23的XXA—XXA线〜XXD — XXD线切断表示导光板3的局部放大剖视图和图20A〜图20D相同。 Here, along the line XXA-XXA of FIG. 23 ~XXD - XXD line partially cutting the light guide plate 3 showing an enlarged cross-sectional view of the same, and FIG. 20A~ FIG 20D. 如上述各图所示,在导光板3背面10侧,从光轴方向上离入射面4规定尺寸的位置(P0)处棱形凸起20、 20间沟形为实质上呈三角形(参照图20D),随着从位置(P0)向入射面4各棱形凸起20、 20 间沟深逐渐降低并其沟形从实质上呈三角形光滑变化成实质上呈园弧形(参照图20C〜图20B),从图23C的交点Pa起入射面4侧形成凸起高度一定的棱形凸起20、 20 (参照图20A)。 As the respective positions shown in FIG, 3 in the back surface side of the light guide plate 10, away from the incidence surface 4 of a predetermined size from the optical axis direction (P0) of the prism protrusions 20, 20 is substantially triangular-shaped groove (see FIG. 2OD), with the projections 20, 20 from the position (P0) to the incident surface 4 of each prism groove depth thereof is gradually lowered and a smooth change from the channel-shaped into a substantially triangular shape substantially circular arc (see FIG 20C~ FIG. 20B), a certain height of the projections is formed of prismatic projections 20, 20 (see FIG. 20A) from the intersection Pa from the incident surface 4 side of FIG. 23C.

此外,沿图23D的XXIA — XXIA〜XXID — XXID线切断表示导光板3的局部放大剖视图和图21A〜图21D相同,如上述各图所示,导光板3背面10侧,从光轴方向上离入射面4规定尺寸的位置(P0)处棱形凸起20、 20间的沟形实质上呈三角形(参照图21D),从位置(P0)随着向入射面4各棱形凸起20、 20间的沟深逐渐降低并且其沟形从实质上呈三角形光滑变化成实质上呈园弧形(参照图21C),从图23D的交点Pa起入射面4侧形成凸起高度一定的棱形凸起20 (参照图21B〜图21A)。 Further, FIG. 23D along XXIA - XXIA~XXID - XXID cutting line represents the light guide plate 3 a partially enlarged cross-sectional view of FIG. 21D and FIG 21A~ same, as shown in the figures described above, the back surface 10 side of the light guide plate 3, the optical axis direction incidence surface 4 from the position predetermined size (P0) of the prism-shaped raised channel 20, 20 is substantially triangular (see FIG. 21D), with the projections 20 from the position (P0) toward the respective prism incident surface 4 Goushen 20 and which gradually decreases from a substantially triangular-shaped groove is changed to a substantially smooth circular arc shape (see FIG. 21C), formed starting from the intersection Pa in FIG. 23D incidence surface 4 side of the edge protrusion height constant shaped projection 20 (see FIG. 21B~ FIG. 21A).

这里,图19A、图20A、及图21A导光板3背面10侧,棱形凸起20依图19A、图20A、图21A的棱形凸起20的次序凸起高度增高,荧光灯5A端部附近的位置(离端面距离Lb的位置)起向着荧光灯5A的两端(在宽度方向上)凸 Here, FIG. 19A, 20A, 21A, and FIG. 10 the back surface side of the light guide plate 3, prism protrusions 20 according to FIG. 19A, 20A, 21A of FIG prismatic protrusion height of the projection 20 higher order, near an end portion of the fluorescent lamp 5A starting position (the position of distance Lb from the end faces) toward both ends of the fluorescent lamp 5A (in the width direction) projecting

起高度光滑地增高。 Since the height smoothly increased.

导光板3射出面6侧形成的棱形凸起21在离荧光灯5A的两端规定距离Lb 的端部附近,如图23所示,形成从离入射面4规定尺寸的位置(Pl)起向入射面4凸起高度逐渐增高,从Pb点至入射面4止的凸起高度为一定。 Prism exit surface 6 side of the light guide plate 3 is formed from the projection 21 in the vicinity of both ends of the fluorescent lamp 5A is a predetermined distance Lb end portion 23, is formed from the position away from the incidence surface 4 of a predetermined size (Pl is) to 4 incident surface projection height gradually increased from the point Pb to the incident surface of the locking projection 4 constant height.

这里,沿图23B的XIXA —XIXA〜XIXD — XIXD线切断表示导光板3的局部放大剖视图和图19A〜图19D相同,如上述各图所示,在导光板3的射出面6 侧,从光轴方向离入射面4规定尺寸的位置(Pl)至前端侧的侧面22为没有形成棱形凸起21的平面(参照图19D),形成从位置(Pl)向着入射面4至Pb点棱形凸起21的高度逐渐增高,形成从Pb点至入射面4棱形凸起21的高度成一定。 Here, FIG. XIXA -XIXA~XIXD 23B along the - line represents a cutting XIXD the light guide plate 3 is an enlarged partial cross-sectional view identical to FIG. 19D and FIG 19A~, as shown in the figures described above, the emission surface 6 side of the light guide plate 3, light from the position (Pl is) from the axial direction of a predetermined size 4 to the side of the incident surface of the front end side of the prism protrusions 22 is not formed in the plane 21 (see FIG. 19D), formed to the incident surface point Pb prism 4 from the position (Pl is) toward the height of the projection 21 is gradually increased, to the point Pb is formed from the incident surface 4 prismatic projection 21 into a certain height. 这里,导光板3射出面6侧人棱形凸起21的断面形状如图19A〜图19C所示,棱形凸起21间的沟形呈现实质上园弧形的稍作波形的形状。 Here, the light guide plate 3 side of the emission surface 6 persons prismatic convex cross-sectional shape 21 as shown in FIG. 19C 19A~, prism-shaped raised channel 21 exhibits a substantially circular arc shape of the waveform of slightly.

此外,导光板3射出面6侧棱形凸起21并入射面4附近的棱形凸起21做成导光板3宽度方向两端部凸起高度最高,宽度方向上也使凸起高度变化。 Moreover, the emission surface 6 side of the light guide plate 3 prismatic prism protrusions 21 and the incident surface 4 near the projections 3 the light guide plate 21 is made widthwise end portions protrusion maximum height, the height of the protrusions in the width direction also changes. 艮P, 在本变形例,如图23B、图23C所示,导光板3射出面6侧棱形凸起21的凸起高度成一定的范围从荧光灯5A端部附近起沿着向荧光灯5A两端的方向渐渐变小,在导光板3入射面4侧宽度方向两端部约为零。 Gen P, in this modified embodiment, FIG. 23B, FIG. 23C, the light guide plate 3 side of the emission surface 6 of the height of the prismatic projection projection 21 into a certain range from the vicinity of the fluorescent lamp 5A toward the end portion of the fluorescent lamp 5A along two end direction gradually decreases, the light guide plate 3 at both end portions in the width direction incident surface 4 is approximately zero. 换言之,导光板3射出面6侧棱形凸起21的高度成一定的范围为用凸起高度变化部分(第2部分) 和凸起高度一定部分(第1部分)的交点Pb的轨迹(图23A上用细线表示的线M4)和入射面4所围的范围。 In other words the trajectory, the light guide plate 3 side of the emission surface 6 of the prismatic protrusion 21 at a certain height range of variation with height of the convex portion (second portion) and a protrusion height constant portion (Part 1) of the intersection point Pb (FIG. lines 23A indicated by thin lines M4) and a range surrounded by four incident surface.

这里,沿图23D的XXAOXXA线〜XXD — XXD线切断表示导光板3的局部放大剖视图和图20A〜图20D相同。 Here, along the line of FIG. 23D XXAOXXA ~XXD - XXD line partially cutting the light guide plate 3 showing an enlarged cross-sectional view of the same, and FIG. 20A~ FIG 20D. 如上述各图所示,导光板3射出面6侧,入射面4至Pb点的范围形成棱形凸起21—定的高度(参照图20A) , Pb点至位置(Pl)的范围形成棱形凸起21的高度逐渐降低(参照图20B〜图20C)。 As shown in the figures described above, the emission surface 6 side of the light guide plate 3, the range of the point Pb to the incident surface 4 is formed prismatic projections 21 of a given height (see FIG 2OA), the range of the point Pb to a position (Pl is) forming rib shaped projection 21 is gradually reduced height (see FIG 20B~ FIG. 20C). 还有, 如图20A〜图20C所示,棱形凸起21的断面形状形成相邻棱形凸起21、 21间 Also, as shown in FIG. 20C 20A~ prismatic convex cross-sectional shape 21 is formed adjacent prism protrusions 21, 21

的沟形变成实质上呈园弧形,呈现稍作波形的形状。 Groove shaped into a substantially circular arc shape, assumes the shape of a little wave.

此外,沿图23D的XXIA — XXIA线〜XXID —XXID线切断表示的导光板3局部放大剖视图和图21A〜图21D相同。 Further, in FIG. 23D XXIA - XXIA wire cutting line ~XXID -XXID enlarged sectional view showing the light guide plate, and FIG. 3 a partial view of the same 21A~ 21D. 如上述各图所示,在导光板3射出面6 侦ij,棱形凸起21形成从位置(Pl)随着向入射面4使凸起高度逐渐增高。 As shown in the figures above, the investigation ij 3 6 exit face of the guide, the prismatic projection 21 is formed from a position (Pl is) so as to the height of the convex incident surface 4 is gradually increased. 还有,如图21A〜图21C所示,棱形凸起21的断面形状形成为相邻棱形凸起21、 21间的沟形实质上呈园弧形,呈现稍作波形的形状。 Also, as shown in FIG. 21C 21A~ prismatic convex cross-sectional shape 21 is formed adjacent prism protrusions 21, the groove 21 is substantially shaped as a circular arc, the waveform exhibits little shape.

这里,图19A、图20A、及图21A导光板3射出面6侧,棱形凸起21依图 Here, FIG. 19A, 20A, and FIG. 21A emission surface 6 side of the light guide plate 3, FIG prismatic projections 21 by

19A、图20A、图21A的棱形凸起21的次序凸起高度增高,和导光板3背面10 侧一样,导光板3宽度方向上凸起高度光滑变化。 . 19A, 20A, 21A of FIG prismatic projections 21 of the order of increasing bump height, and the back surface 10 side of the light guide plate 3 as a smooth bump height variation in the width direction of the light guide plate 3.

采用上述构成的本变形例的导光板3能增多从荧光灯5A两端对应的入射面4侧角部来的射出光量,能使作为光源使用荧光灯5A时易产生的低亮度部分不显眼。 Modification of the present embodiment using the configuration of the light guide plate 3 can increase the amount of light emitted from the incident surface 4 side corner portions at both ends of the fluorescent lamp 5A corresponding to the low luminance part can easily generated when the fluorescent lamp 5A as a light source inconspicuous. 此外,采用本变形例的导光板3,在使入射面4侧棱形凸起20、 21 的凸起高度在宽度上变化之同时,通过将棱形凸起20、 21间的形状做成实质上呈园弧形,通过在因棱形凸起20、 21产生的光的反射。 Furthermore, this modification of the light guide plate 3, when the incidence surface 4 side of the prismatic protrusion height of the projection 20, 21 vary in width the same time, by the shape of the prism protrusions 20, 21 made of the substance the circular arc shape, the reflected light generated due to the prismatic projection by 20, 21. 扩散作用上下功夫, 能使入射面4上下边缘4A、 4B射入的光产生的亮线不显眼。 Efforts on the diffusion effect, can make the upper and lower edge 4 incident surface 4A, 4B incident light bright line generated inconspicuous. 其结果,使用本变形例导光板3的面光源装置11能获得明亮、均匀的照明。 As a result, this modified embodiment of the guide plate surface light source device 11 can obtain a bright, uniform illumination. 此外,使用本变形例导光板3的图象显示装置1能谋求显示品质的高质量。 Furthermore, the use of this modification the light guide plate 3, the image display apparatus 1 is possible to achieve high display quality.

[第4实施形态] [Fourth Embodiment]

图24A〜图24D表示本发明第4实施形态涉及的导光板3。 FIG. 24D showing the light guide plate 24A~ FIG fourth embodiment of the present invention relates to 3. 其中,图24A 表示从导光板3射出面6侧看到的平面图、图24B表示图24A的XXIVB — XXIVB 线剖视图、图24C表示图24A的XXIVC — XXIVC线剖视图、图24D表示图24A 的XXIVD—XXIVD线剖视图。 Wherein FIG. 24A is a plan view seen from the side surface of the light guide plate 3 exit 6, 24A, FIG 24B shows XXIVB - XXIVB line sectional view of FIG. 24A FIG. 24C showing XXIVC - XXIVC line cross-sectional view, XXIVD- FIG. 24A showing FIG 24D XXIVD line cross-sectional view.

本实施形态的导光板3在使其背面10侧及射出面6侧的两面的棱形凸起25、 26的凸起高度在宽度方向上变化这种点上和前述第3实施形态导光板3共同,但在使其棱形凸起25、 26凸起高度变化的方法上和前述第3实施形态涉及的导光板3不同。 In this embodiment the light guide plate 3 in the manner the back side 106 and the emission-side surface of both sides of the prismatic protrusion height of the protrusions 25, 26 and the point of this change on the third embodiment of the light guide plate 3 in the width direction and the light guiding plate according to the third embodiment 3 on various common methods, but it prismatic projection 25, the projection 26 of the height variation.

艮P,本实施形态的导光板3和前述第1〜第3实施形态导光板3—样,随着离入射面4侧越远板厚变薄、断面实质上呈楔形,并且平面形状做成矩形。 Gen P, the light guide plate 3 according to the present embodiment and the third embodiment of 3- 1 ~ comp guide plate, as the distance from the incident surface 4 side thin thickness, a substantially wedge-shaped cross section, and shaped to a plane rectangle. 而且,导光板3,其背面IO侧整个面形成棱形凸起25,同时,入射面4起在规定范围的射出面6上形成棱形凸起26。 Further, 3, the entire surface of the back surface side of the light guide plate is formed IO prismatic projection 25, while the incidence surface 4 is formed from prism protrusions 26 on the emission surface 6 of the predetermined range. 这些棱形凸起25、 26都在与入射面4实质上呈正交的方向上延伸,并沿入射面4平行形成多条。 These prism protrusions 25, 26 extend in a direction orthogonal to the incident surface was substantially 4, and forming a plurality of parallel along the incidence surface 4.

射出面的棱形凸起26,离入射面4规定距离的点(例如,设入射面4的板厚为T,约在离入射面20T的位置)P2起向入射面4形成凸起高度逐渐增高。 Prismatic projections 26 of the exit surface, the distance from the predetermined point 4 incident surface (e.g., 4 disposed incident surface thickness is T, at a position about 20T away from the incidence surface) from P2 to form raised height is gradually incident surface 4 increased. 而且,该射出面6的棱形凸起26形成从光轴La向导光板3的轴向随着离去凸起高度逐渐增高,在相邻LED5、 5间中间位置及导光板3的宽度方向两端形成凸起高度最高。 Moreover, the emission surface 6 of the prismatic projection 26 is formed the bump height increased gradually from the optical axis La of the light guide plate 3 in the axial direction with leaving, adjacent LED5, 5 Room widthwise intermediate position of the light guide plate 3 and the two end of the protrusion maximum height is formed. 这里,射出面6的棱形凸起26如图24B、图24C、图24D所示, 形成棱形凸起26、 26的沟26a的倾角(棱形凸起26、 26间的沟26a和射出面6的夹角)a从光轴La起随着向导光板3宽度方向离去而变大。 Here, the emission surface 6 of the prism protrusions 26 FIG. 24B, FIG. 24C, FIG. 24D, the prismatic projection grooves 26a with an angle of 26, a 26 (groove 26a prismatic projections 26, 26 between the emitted and 6 face angle.) a 3 starting with the departure of the light guide plate width direction becomes larger from the optical axis La. 其结果,射 As a result, radio

出面6的棱形凸起26的凸起高度如上所述,随着从光轴La向导光板3的宽度方向离去而逐渐增高。 6 prismatic protrusions 26 come out of bump height described above, as departure from the optical axis La in the width direction of the light guide plate 3 gradually increases.

背面10的棱形凸起25自离入射面4规定距离的点(例如,设导光板3入射面4侧的板厚为T,离入射面4约20(T)的位置)P3至导光板3的前端(侧面22)的范围内,形成同一凸起高度。 Prismatic projection 25 from the back surface 10 of the point a predetermined distance from the incidence surface 4 (e.g., a thickness of the light guide plate 3 side of the incidence surface 4 is T, and a position away from the incidence surface 4 to about 20 (T) of) the light guide plate P3 the range of the front end (side 22) 3, is formed in the same projection height. 而且,背面10的棱形凸起25从入射面4至规定距离的点P3的范围内形成随着向入射面4凸起高度逐渐降低。 Further, the back surface 10 of the prism protrusions 25 from the incident surface 4 is formed to a predetermined height decreases with the incidence surface 4 of the projection distance in the range of point P3. 而且, 该背面10的棱形凸起25形成随着从光轴La向导光板3宽度方向离去凸起高度逐渐增高,在相邻LED25、 25间的中间位置及导光板3宽度方向两端部上凸起高度最高。 Further, the back surface 10 of the prism protrusion 25 is formed away from the optical axis La as the width direction of the light guide plate 3 gradually increased bump height, at an intermediate position 25 between the light guide plate 3 and the both widthwise end portions adjacent LED25 raised on the highest level. 这里,背面10的棱形凸起25如图24B、图24C、图24D所示, 形成棱形凸起25、 25间的沟25a的倾角(棱形凸起25、 25间的沟25a和背面IO的夹角)e随着从光轴La向导光板3宽度方向离去而减小。 Here, the back surface 10 of the prism protrusions 25 FIG. 24B, FIG. 24C, FIG. 24D, the prism protrusions 25 are formed, the groove 25a of the angle of inclination 25 (prism protrusions 25, 25 and the back groove 25a IO angle) e away from the optical axis La as the width direction of the light guide plate 3 is reduced. 还有,棱形凸起25、 25间沟25a的倾角P在相邻LED5、 5间的中间位置及导光板3的宽度方向两端部上可取PO。 Further, the prism protrusions 25, 25 of the groove 25a in the adjacent LED5 angle P, PO desirable intermediate position between the light guide plate 5, and both end portions in the widthwise 3. .

上述构成的本实施形态导光板3和上述第3实施形态导光板3 —样,能抑制LED5附近的射出,促进光从LED5、 5间、宽度方向两端易变成暗部处射出, 实现射出面6整体亮度均匀,能使以往成为问题的亮线H (参照图40)更不显眼。 The present embodiment is composed of the light guide plate 3 and the third embodiment, the light guide plate 3 - like, can be suppressed near the LED5 emitted, from light to promote LED5, 5 rooms, both widthwise easily emitted at a dark portion, to achieve emission surface 6 the overall luminance uniformity, the conventional problem can bright lines H (see FIG. 40) less visible. 其结果,使用本实施形态导光板3的面光源装置11能获得明亮、均匀的面照明(参照图1及图8)。 As a result, with the present embodiment, the light guide plate 3 of the surface light source device 11 can obtain a bright and uniform surface illumination (see FIGS. 1 and 8). 此外,使用本实施形态导光板3的图象显示装置1能实现显示品质的高质量(参照图1及图8)。 Further, the image light guide plate 3 in this embodiment using the display apparatus 1 can realize high display quality (see FIGS. 1 and 8). 还有,通过将导光板3的点P2、 P3至入射面4的各棱形凸起26、 26间及25、 25间的沟26a、 25a的断面形状做成例如如图19A所示实质上呈园弧形,则能有效地产生光的扩散或漫反射,能进一步更有效地实现导光板3射出的光亮度均一及高亮度。 Further, by the light guide plate 3 in points P2, P3 to the incident surface 4 of each prismatic projections 26, 26 and grooves 25, 25 between 26a, 25a of the cross-sectional shape substantially as shown in FIG. 19A made e.g. circular arc shape, it is effective to produce diffusion or irregular reflection of light can be further achieved more effectively emitted light guide plate 3 uniform brightness and high brightness. (第4实施形态的变形例) (Modification of the fourth embodiment)

上述第4实施形态列举使用LED5作为点光源的形态的例子,但如图25A〜 图25D所示,也可将荧光灯5A作为线状光源使用代替LED5。 It includes the above-described fourth embodiment LED5 used as a point light source form an example, but as shown in FIG. 25D 25A~, the fluorescent lamp 5A may be used in place of the linear light sources LED5. 还有,在图25A〜 图25D所示的面光源装置11上,对与上述第4实施形态的构成相同的构成赋以与上述第4实施形态同一符号,省略和第4实施形态重复的说明。 Further, in the surface light source device illustrated in FIG 25A~ FIG 25D 11, constituting the above-described fourth embodiment is the same as the above-described configuration assigned to the fourth embodiment, the same reference numerals, and the fourth embodiment are omitted redundant description . 这里,图25A表示从导光板3射出面6侧所见的平面图、图25B表示图25A的XXVB—XXVB 线剖视图、图25C表示图25A的XXVC-XXVC线剖视图、图25D表示图25A的XXVD — XXVD线剖视图。 Here, FIG. 25A showing a plan view as seen from the 3 exit 6 side face of the guide, FIG. 25B to FIG XXVB-XXVB line 25A is a sectional view, FIG. 25C showing FIG XXVC-XXVC line 25A is a sectional view, XXVD FIG. 25D showing FIG. 25A - XXVD line cross-sectional view.

本变形例导光板3和前述第1〜第4实施形态导光板3 —样,为离入射面 This modification of the light guide plate 3 and a fourth embodiment of the light guide plate 1 ~ 3 - like, is away from the incident surface

4侧越远板厚变薄、断面实质上呈楔形,并形成平面形状为实质上呈矩形。 4 thinner thickness the farther side, a substantially wedge-shaped cross section, and is formed in a substantially rectangular planar shape. and

且,导光板3在其背面10侧整个面形成棱形凸起25,同时,离入射面4规定范围内射出面6上形成棱形凸起26。 And, the entire surface of the light guide plate 3 is formed prismatic projections 25 on its back surface 10 side, while the exit plane 6 is formed prismatic projection in the range of from 26 4 predetermined incident surface. 这些棱形凸起25、 26都在与入射面4实质上呈正交的方向上延伸,并沿入射面4平行形成多条。 These prism protrusions 25, 26 extend in a direction orthogonal to the incident surface was substantially 4, and forming a plurality of parallel along the incidence surface 4.

射出面的棱形凸起26离入射面4规定距离的点(例如,设入射面4的板厚为T,离入射面4约20T的位置)P2向入射面4形成凸起高度逐渐增高。 Prismatic projections emission surface 4 a predetermined distance from the incident face 26 points (e.g., 4 disposed incident surface thickness is T, the position of about 20T away from the incidence surface 4) gradually increasing the height of the projection P2 is formed to the incident surface 4. 而且,该射出面6的棱形凸起26形成从荧光灯5A的端部附近(离端面距离L6 的部位)随着向荧光灯5A的端面方向去凸起高度逐渐增加,导光板3宽度方向两端部形成凸起高度最高。 Moreover, the emission surface 6 of the prismatic projections 26 are formed gradually increasing in height from the vicinity of an end portion of the fluorescent lamp 5A (L6 from the end surface of the distance portion) to the projection with the end surface direction of the fluorescent lamp 5A, the light guide plate 3 at both ends in the width direction protrusion maximum height portion is formed. 这里,射出面6的棱形凸起26如图25B、图25C、 图25D所示,形成棱形凸起26、 26间的沟26a的倾角(棱形凸起26、 26间沟26a和射出面6的夹角)a从荧光灯5A的端部附近起随着向荧光灯5A的端面方向远去而增大。 Here, the emission surface 6 of the prism protrusions 26 25B, the FIG. 25C, FIG. 25D, the prism protrusions formed grooves 26a 26, 26 of the angle (prism protrusions 26, 26 and the exit groove 26a 6 face angle.) a away from the end surface with the direction of the fluorescent lamp 5A is increased from the vicinity of the end portion of the fluorescent lamp 5A. 其结果,射出面6的棱形凸起26的凸起高度如上所述,从荧光灯5A的端部附近起随着在向荧光灯5A的端面方向远去而逐渐增高。 As a result, the emission surface 6 of the prismatic protrusion height of the projection 26 as described above, from the vicinity of the end portion of the fluorescent lamp 5A toward the end face as in the direction away of the fluorescent lamp 5A is gradually increased.

背面10的棱形凸起25在离入射面4规定距离的点(例如,设导光板3入射面4侧的板厚为T,离入射面4约20 (T)的位置)P3至导光板3的前端(侧面22)的范围内形成同一凸起高度。 Prismatic projections 25 of the back surface 10 at a point a predetermined distance from the incidence surface 4 (e.g., a thickness of the light guide plate 3 side of the incidence surface 4 is T, and a position away from the incidence surface 4 to about 20 (T) of) the light guide plate P3 range front end (side 22) of the projection 3 is formed in the same height within. 而且,背面10的棱形凸起25在从入射面4至规定距离的点P3的范围内形成随着向入射面4凸起高度逐渐降低。 Further, the back surface 10 of the prism protrusion 25 is formed to gradually decrease as the height of the incident surface in the range of 4 projections point P3 from the incident surface 4 to a predetermined distance. 而且, 该背面10的棱形凸起25形成从荧光灯5A的端部附近随着向荧光灯5A的端面方向远去,凸起高度逐渐增高,导光板3宽度方向两端部形成凸起高度最高。 Further, the back surface 10 of the prism protrusion 25 is formed with an end portion away from the vicinity of the fluorescent lamp 5A toward the end surface direction of the fluorescent lamp 5A, the height of the projections is gradually increased, the light guide plate 3 is formed widthwise end portions highest projection height. 这里,背面10的棱形凸起如图25B、图25C、图25D所示,形成棱形凸起25、 25间的沟25a的倾角(棱形凸起25、 25间的沟25a和背面10的夹角)P随着从荧光灯5A的端部附近向荧光灯5A的端面方向远去而变小。 Here, the back surface 10 of the prism protrusion 25B, the FIG. 25C, FIG. 25D, the prism protrusions 25 are formed, the groove 25a of the angle of inclination 25 (prism protrusions 25, 25 and the back surface 25a of the groove 10 angle) P as away from the vicinity of the end portion of the fluorescent lamp 5A toward the end face direction of the fluorescent lamp 5A becomes smaller. 还有,棱形凸起25、 25间的沟25a的倾角e可在导光板3宽度方向两端部上,取P :0° 。 Further, the prismatic projection grooves 25a 25, 25 between the angle e may be on both ends of the light guide plate 3 in the width direction, taking P: 0 °.

采用上述构成的本变形例的导光板3,能增多从荧光灯5A的两端部对应的入射面4侧导光板3的角部来的射出光量,能使作为光源使用荧光灯5A的场合易产生的低亮度部分不显眼。 The light guide plate using the above-described configuration of the present modification 3, can increase the amount of light emitted from both ends of the fluorescent lamp 5A corresponding to the incident surface side of the light guide plate 4 3 to the corner portion, where a fluorescent lamp as a light source can easily generated 5A low luminance portion inconspicuous. 此外,本变形例的导光板3通过使其宽度方向两端侧并入射面4侧棱形凸起20、 21的凸起高度在宽度方向变化使得其宽度方向两端部最高,从而能使因入射面4的上下边缘4A、 4B射入的光产生的亮线不显眼。 Further, the light guide plate 3 in this modification both ends of the width direction side, and by making the incident surface 4 side prism protrusions 20, 21 of the bump height variation in the width direction such that both end portions in the width direction maximum, thereby enabling the result of 4 of the upper and lower edges incident surface 4A, 4B incident light bright line generated inconspicuous. 其结果,使用本变形例导光板3的面光源装置11能获得明亮、均匀的面照明。 As a result, this modified embodiment of the guide plate surface light source device 11 can obtain a bright and uniform surface illumination. 此外使用本变形例导光板3的图象显示装置1能实现显示品质高质量。 Moreover this modified embodiment the light guide plate 3, the image display apparatus 1 can achieve high display quality.

还有,通过将导光板3的点P2、 P3至入射面4的各棱形凸起26、 26间及25、 25间的沟26a、 25a的断面形状做成如图19A所示实质上呈园弧形,从而能有效地产生光的扩散或漫反射,进一步有效地谋求导光板3射出的光亮度均匀及提高亮度。 Further, by the light guide plate 3 in points P2, P3 to the incident surface 4 of each prismatic projections 26, 26 and grooves 25, 25 between 26a, 25a of the sectional shape shown in Figure 19A is made substantially in the circular arc, which can effectively produce a diffusion or irregular reflection of light, more effectively seek brightness emitted from the light guide plate 3 and improve the uniform luminance.

[第5实施形态] [Fifth Embodiment]

图26A〜图26D表示本发明第5实施形态涉及的面光源装置11。 FIG 26A~ FIG. 26D showing the surface light source device of the present invention according to the fifth embodiment 11. 其中,图26A表示从导光板3射出面6侧所见的平面图、图26B表示图26A的XXVIB— XXVIB线剖视图、图26C表示图26A的XXVIC —XXVIC线剖视图、图26D表示图26A的XXVID — XXVID线剖视图。 Wherein FIG. 26A is a plan view as seen from the side surface of the light guide plate 3 exit 6, FIG. 26B shows the line 26A XXVIB- XXVIB sectional view, FIG. 26C showing the line XXVIC -XXVIC FIG. 26A is a sectional view, XXVID of FIG. 26A FIG. 26D showing - sectional view along line XXVID.

本实施形态导光板3在宽度方向上使其背面10侧及射出面6侧的两面棱形凸起27、 28的凸起高度变化这种点上,与前述第3及第4实施形态导光板3 共同,但使其棱形凸起27、 28凸起高度变化的方法上与前述第3及第4实施形态涉及的导光板3不同。 Both surfaces of the light guide plate 3 in this embodiment so that the side 10 and the exit-side surface 6 in the width direction of the back surface of the prismatic projection 27, the projection 28 on the height variations of this point, and the third and fourth embodiment of the light guide plate 3 common, but the method of the light guide plate so as prismatic projections 27, 28 and the bump height variation in the third and fourth embodiment according to 3 different.

艮口,本实施形态的导光板3和前述第1〜第4实施形态的导光板3 —样, 为随着离入射面4侧越远板厚变薄、断面实质上呈楔形,并形成平面形状为矩形。 Gen port, according to the present embodiment of the light guide plate 1 ~ 3 and the fourth embodiment of the light guide plate 3 - like, as is farther away from the incidence surface 4 side thin thickness, a substantially wedge-shaped cross section, and forms a plane rectangular in shape. 而且,导光板3其背面10侧整个面形成棱形凸起27之同时,在入射面4 的附近(特别易发生异常发光(亮线)的部分)的射出面6上形成棱形凸起28。 Further, the back surface 3 side of the whole surface of the light guide plate 10 is formed simultaneously prismatic projection 27, the projection 28 is formed on the prism exit surface 6 in the vicinity of the incidence surface 4 (particularly the abnormal light emitting (bright line) prone portion) of . 这些棱形凸起27、 28都在与入射面4实质上正交的方向上延伸,并沿入射面4 平行形成多条。 These prism protrusions 27, 28 extend in a direction substantially perpendicular to the incident surface 4, and is formed along the incidence surface 4 a plurality of parallel.

输出面6的棱形凸起28形成随着越近入射面4凸起高度逐渐增高。 Prism output plane 6 is formed with projections 28 near the incidence surface 4 gradually increasing height projections. 而且, 该射出面6的棱形高度28形成从光轴La起随着向导光板3宽度方向凸起高度逐渐增加,在相邻LED5、 5间的中间位置及导光板3的宽度方向两端部形成凸起高度最高。 Moreover, the emission surface 6 of the prism 28 is formed from the height of the optical axis La increases gradually as the height of the projections 3 in the width direction toward the light guide plate, adjacent LED5, light guide plate 5 and the intermediate position between both end portions in the widthwise direction 3 forming protrusion maximum height. 这里,射出面6的棱形凸起28如图28B〜图28D所示,形成其相邻棱形凸起28、 28间沟28a的倾角(沟28a和射出面6的夹角)成为全部相同的倾角S。 Here, the emission surface 6 of the prism protrusions 28 shown in FIG 28B~ FIG. 28D, is formed adjacent prism protrusions 28, 28 of the groove 28a inclination (angle between the groove 28a and the emission surface 6) become all the same the inclination S. 其结果,射出面6没有棱形凸起28的位置(凸起高度为零的点) P4如图26A所示,在光轴La上最近入射面4,在LED5、 5间的中间位置及导光板3的两端部离入射面4最远。 As a result, the emission surface 6 is not prismatic projection position (the projection height of zero point) 28 P4 shown in FIG. 26A, recently incident surface on the optical axis La 4, in LED5, and an intermediate position of the guide 5 both end portions of the optical plate 3 furthest from the incidence surface 4. 而且,射出面6棱形凸起28的凸起高度为零的点P4的轨迹如图26所示,光滑的曲线M5变成连成波形的形状。 Moreover, the emission surface 6 prismatic protrusion height of the protrusion 28 of the track zero point P4 shown in Figure 26, the smooth curves M5 connected into a shape waveform. 还有, 本实施形态中,在射出面6棱形凸起28的凸起高度为零的位置P4并离入射面4最远的位置P4设导光板3入射面4的板厚为(T),则定在光轴方向上离入射面4约20 (T)的位置。 Further, in this embodiment, the emission surface 6 in the position P4 prismatic protrusion height of the protrusion 28 is zero and P4 positions provided from the incidence surface 4 of the light guide plate furthest thickness of 3 to 4 incident surface (T) , the predetermined position from the incidence surface 4 to about 20 (T) in the optical axis direction.

背面10的棱形凸起27至少在离入射面4规定距离的点(例如,设入射面 Prismatic projections 27 of the back surface 10 at a point at least a predetermined distance from the incidence surface 4 (e.g., the incident surface disposed

的板厚为T,离入射面约20T的位置)至导光板3的前端(侧面22)的范围上, 形成同一凸起高度。 Over a range of thickness T, the position of about 20T away from the incidence surface) to the front end of the light guide plate (3 side 22) is formed in the same projection height. 而且,背面10的棱形凸起27在入射面4的附近,形成从凸起高度一定的部分起随着向入射面4形成使凸起高度逐渐降低。 Further, the back surface 10 of the prism protrusions 27 in the vicinity of the incidence surface 4, as from a certain portion of the incident surface 4 is formed so that the projection height gradually decreases from the height of the projection. 而且,该背面10的棱形凸起27随着从光轴La向导光板3宽度方向离去形成凸起高度逐渐增高,在相邻LED5、 5间的中间位置及导光板3的宽度方向两端部形成凸起高度最高。 Further, the back surface 10 of the prism protrusion 27 away from the optical axis La as the width direction of the light guide plate 3 is formed gradually increased bump height, widthwise ends of the adjacent LED5 3, and an intermediate position between the light guide plate 5 protrusion maximum height portion is formed. 这里,背面10的棱形凸起27如图26B、图26C、图26D所示,棱形凸起27、 27间沟27a的倾角(棱形凸起27、 27间沟27a和背面10的夹角) e不论在何种断面都一定。 Here, the back surface 10 of the prism protrusions 27 in FIG. 26B, FIG. 26C, 26D shown in FIG prismatic projection angle 27, 27 of the groove 27a (prismatic projections 27, grooves 27a and the back surface 27 of the clamp 10 angle) e are constant no matter what section. 因此,背面10的棱形凸起27上,凸起高度一定的部分和凸起高度变化的部分的交点P5位于光轴La上离入射面4最远的位置, 随着向导光板3宽度方向离去而靠近入射面4。 Thus, the back surface 10 of the prism protrusion 27, protrusion height constant position farthest from the incidence surface 4 and the intersection portion of the protrusion height varying portion P5 on the optical axis La, with the width direction of the light guide plate 3 from the 4 and close to the incident surface. 由此,背面10棱形凸起27凸起高度变化点P5的轨迹如图26A所示,光滑的曲线(以虚线表示的曲线)M6 呈现波形连接的形状,呈和射出面6侧的轨迹M5几乎相反的形状。 Thereby, the back surface 10 of prismatic projection 27 convex trajectory height variation of the point P5 in FIG. 26A, a smooth curve (curve indicated by dotted lines) M6 takes the shape of a waveform connection, the track 6 and the exit plane side was M5 shape almost opposite. 还有,在图26D所示断面上,可以在背面10整个面上形成凸起高度几乎一定的棱形凸起27。 Further, in the cross-section shown in FIG. 26D, the height of the projections may be formed of substantially constant prismatic projections 27 on the entire surface of the back surface 10. 这时,背面10的棱形凸起27的凸起高度为一定的部分和凸起高度变化的部分的交点P5的轨迹变成从离入射面4规定距离20 (T)的位置至入射面4 的光滑曲线。 At this time, the back surface 10 of the prism protrusion height of the protrusions 27 is constant and the convex portion of the height variation of the track portion from the intersection point P5 becomes a distance 20 (T) 4 from the predetermined position to the incident surface of the incident surface 4 smooth curve.

上述构成的本实施形态导光板3和上述第3及第4实施形态的导光板3 — 样,能抑制LED5附近的射出,促使光从LED5、 5间宽度方向两端部的易变暗的部分射出,实现射出面6整体亮度均匀,以前成为问题的亮线H(参照图40) 能更不显眼。 3 of the present embodiment, the light guide plate and said third and fourth embodiment of the light guide plate 3 constituting the - like, can be suppressed near the exit LED5, causes light from LED5, 5 between both ends in the width direction easily darkened portion injection, a uniform overall brightness exit surface 6, the bright line before the problem becomes H (see FIG. 40) can be more inconspicuous. 其结果,使用本实施形态导光板3的面光源装置11能获得明亮、 均匀的面照明(图1及图8参照)。 As a result, with the present embodiment, the light guide plate 3 of the surface light source device 11 can obtain a bright and uniform surface illumination (FIG. 1 and FIG. 8). 此外,使用本实施形态导光板3的图象显示装置1能实现显示品质高质量(参照图1及图8)。 Further, the image light guide plate 3 in this embodiment using the display apparatus 1 can realize high display quality (see FIGS. 1 and 8). (第5实施形态的变形例) (Modification of the fifth embodiment)

上述第5实施形态列举了使用LED5作为点光源样态的例子,如图27A〜图27D所示,也可使用荧光灯5A作为线状光源代替LED5。 The above-described fifth embodiment shows example LED5-like state as a point source, as shown in FIG. 27D 27A~ may be used instead of a linear light source as a fluorescent lamp 5A LED5. 还有,在图27A〜图27D所示的面光源装置11,对于与上述第5实施形态同一构成赋以与第5实施形态同一的符号,省略与第5实施形态重复的说明。 Further, in the surface light source device illustrated in FIG 27A~ FIG 27D 11, those of the fifth embodiment with the same configuration assigned to the fifth embodiment the same reference numerals, and repeated description thereof will be omitted fifth embodiment. 这里,图27A表示从导光板3射出面6侧所见的平面图,图27B表示图27A的XXVIIB—XXVIIB线断面, 图27C表示图27A的XXVnC — XXVHC线剖视图、图27D表示图27A的XXWD —XX WD线剖视图。 Here, as seen from FIG. 27A shows the side surface of the light guide plate 3 6 exit plan, XXVnC 27A of FIG. 27B shows a section taken along line XXVIIB-XXVIIB, FIG. 27A FIG. 27C represents - XXVHC line cross-sectional view, FIG. 27A, FIG. 27D showing XXWD - sectional view along line XX WD.

本变形例的导光板3的前述第5实施形态导光板3同样,离入射面4侧越远板厚越薄断面实质上呈楔形,并且形成平面形状为矩形。 The light guide plate 3 according to the present modification of the fifth embodiment of the light guide plate 3 Similarly, from the incident surface 4 side farther thinner thickness substantially wedge-shaped cross section, and is formed in a rectangular planar shape. 而且,导光板3在其背面10侧的整个面形成棱形凸起27之同时,还在入射面4附近(特别是容易发生异常发光(亮线)的部分)的射出面6上形成棱形凸起28。 Further, the light guide plate 3 is formed of the prism protrusions 27 on the entire surface thereof while the back surface 10 side, the prism 64 is also formed near the incident surface (especially prone to abnormal light emitting (bright line) portion) of the exit plane projection 28. 这些棱形凸起27、 28都在与入射面4实质上正交的方向上延伸,并沿入射面4平行形成多条。 These prism protrusions 27, 28 extend in a direction substantially perpendicular to the incident surface 4, and is formed along the incidence surface 4 a plurality of parallel.

射出面6的棱形凸起28形成越近入射面4凸起高度逐渐增高。 Prism exit surface 6 of the protrusion 28 is formed near the incidence surface 4 gradually increasing height projections. 而且,该射出面6的棱形凸起28形成从离荧光灯5A的端面距离L6的位置(端部附近) 起沿着向荧光灯5A端面的方向凸起高度逐渐增高,在导光板3宽度方向两端部凸起高度最高。 Moreover, the emission surface 6 of the prismatic projections 28 are formed from the end face gradually increasing in distance from the fluorescent lamp 5A L6 position (near the end) along the height of the protrusions from the fluorescent lamp 5A toward the end surface, the light guide plate 3 in the width direction of the two end protrusion maximum height.

这里,射出面6的棱形凸起28如图27B〜图27D所示,形成其相邻棱形下起28、 28间沟28a的倾角(沟28a和射出面6的夹角)全部为同一倾角6 。 Here, the emission surface 6 of the prismatic projections 28 as shown in Figure 27D 27B~, 28 which are formed, the groove 28a of the angle 28 (the angle between the groove 28a and the emission surface 6) from all the adjacent prismatic same inclination 6. 其结果,无射出面6棱形凸起28的位置(凸起高度为零的点)P4如图27A所示,与荧光灯5A两侧端部附近对应的位置之间变成与入射面4几乎平行的直线M6a最接近入射面4,导光板3的两端部离入射面4最远。 As a result, no emission surface 6 prismatic projection position (the projection height of zero point) 28 P4 shown in Figure 27A, it becomes a position in the vicinity of the fluorescent lamp 5A between both ends of the incident surface corresponding to almost 4 M6a closest to a straight line parallel incident surface 4, both end portions of the light guide plate 3 furthest from the incidence surface 4. 而且,射出面6 的棱形凸起28的凸起高度变成零的点P4的轨迹如图27A所示,变成在直线M6a 的两端部光滑的曲线M6b、 M6b连接的形状。 Further, the emission surface 6 of the prismatic protrusion height of the protrusion 28 of the track becomes zero point P4 shown in FIG. 27A, the curve becomes a smooth shape in the both end portions of the straight line M6a M6b, M6b connection. 还有,在本实施形态,射出面6 棱形凸起28的凸起高度变成零的位置P4并离入射面4最远的位置P4设导光板3入射面4侧的板厚为T,则可以定为在光轴方向上离入射面4约20 (T) 的位置。 Further, in the present embodiment, the emission surface 6 of the prismatic protrusion 28 protrusion height becomes zero position P4 and a position farthest from the incidence surface 4 provided P4 thickness light guide plate 3 side of the incidence surface 4 is T, It may be set at a position away from the incidence surface 4 to about 20 (T) in the optical axis direction.

背面10的棱形凸起27至少从离入射面4规定距离的点(例如,设入射面的板厚为T,则离入射面约20T的位置)至导光板3的前端(侧面22)的范围内,形成同一凸起高度。 Prismatic projections 27 of the back surface 10 from at least a predetermined distance from the incident surface of 4:00 (e.g., provided the incident surface thickness is T, the position of about 20T away from the incidence surface) of the front end of the light guide plate (side 22) 3 the range, the same projection height is formed. 而且,背面10的棱形凸起27在入射面4附近,形成从凸起高度一定的部分起越近入射面4凸起高度逐渐降低。 Further, the back surface 10 of the prism protrusions 27 in the vicinity of the incident surface 4, is formed near the incidence surface from a certain height of the convex portion 4 from the projection height gradually decreases. 而且,其背面10 棱形凸起27形成从荧光灯5A的端部附近起沿着向荧光灯5A的端面凸起高度逐渐增高,在导光板3的宽度方向两端部形成凸起高度最高。 Further, the back surface 10 of prismatic projections 27 formed along end surfaces of the fluorescent lamp 5A projection height gradually increases from the vicinity of the end portion of the fluorescent lamp 5A, the height of the highest protrusion is formed at both ends in the width direction of the light guide plate 3.

这里,背面10的棱形凸起27如图27B、图27C、图27D所示,棱形凸起27、 27间沟27a的倾角(棱形凸起27、 27间的沟27a和背面10的夹角)e在任何断面都是一定。 Here, the back surface 10 of the prism protrusions 27 in FIG. 27B, FIG. 27C, FIG. 27D, the prism protrusions 27, 27a of the groove 27 angle (prism protrusions 27, 10 and the back groove 27a 27 angle) e at any cross section is constant. 因此,在背面10的棱形凸起27上,凸起高度一定的部分和凸起高度变化的部分的交点P5在荧光灯5A两端部附近对应的位置间位于离入射面4最远的位置,变成从荧光灯5A的端部附近随着向荧光灯5A端面方向 Thus, the back surface 10 of the prism protrusion 27, a certain height of the convex portion and the convex portion of the height variation of the point of intersection P5 located farthest from the incidence surface 4 between positions corresponding to both end portions in the vicinity of the fluorescent lamp 5A, into the vicinity of the end with the fluorescent lamp 5A toward the end surface direction of the fluorescent lamp 5A

远去而靠近入射面4。 4 close to the incident surface away. 由此,背面10棱形凸起27的凸起高度变化的点P5的轨迹如图27A所示,呈现以直线M7a连接两端光滑的曲线(用虚线表示的曲线) M7b、 M7b的形状,呈与射出面6侧的轨迹(用直线M6a连接曲线M6b和曲线M6b之间的线)几乎相反的形状。 Thus, the prismatic projection 10 of the projection 27 changes the height of the back surface of the track point P5 shown in Figure 27A, the curve exhibits (curves indicated by broken lines) to a straight line M7a M 7 b connected to both ends of the smooth, M 7 b shape, form shape of the trajectory is almost opposite to the side of the exit 6 (a curve connecting between a straight line M6a curves M6b and M6b line). 还有,在图27D所示断面上,可以做成在背面10的整个面形成凸起高度几乎一定的棱形凸起27。 Further, in the cross-section shown in FIG. 27D, it can be made in the entire surface of the back surface 10 is formed substantially constant height of the projections 27 of the prismatic protrusion. 这时,背面10棱形凸起27的凸起高度一定的部分和凸起高度变化的部分交点P5的轨迹变成从离入射面4规定20 (T)的位置至入射面4的光滑曲线。 At this time, the back surface 10 of prismatic convex protrusion height constant portion of the track 27 and the height of the protrusion portion changing from the intersection point P5 becomes a predetermined from the incident surface 4 20 (T) to position 4 of the incident surface smooth curve.

采用上述构成的本变形例的导光板3能增多从荧光灯5A两端部对应的入射面4侧角部射出的光量,能使将荧光灯5A作为光源使用的场合易产生的低亮度部分不显眼。 Using the light guide plate 3 according to the present modification can increase the amount of light emitted from the incident surface 4 side corner portions corresponding to both ends of the fluorescent lamp 5A, the low-luminance part can be a fluorescent lamp 5A as a light source used in the case inconspicuous easy to produce configuration. 此外,采用本实施例的导光板3通过使其宽度方向两端侧并入射面4侧的棱形凸起20、 21的凸起高度在宽度方向上变化使其宽度方向两端部最高,从而能使从入射面4上下边缘4A、 4B射入的光产生的亮线不显眼。 Further, with the present embodiment the light guide plate 3 and the incident surface 4 side by side so that both ends in the width direction of prismatic projection height of the projection 20, 21 in the width direction of the change so that the highest both widthwise end portions, whereby 4 enables the upper and lower edges incident surface 4A, 4B incident light bright line generated inconspicuous. 其结果,使用本变形例导光板3的面光源装置11能获得明亮、均匀的面照明。 As a result, this modified embodiment of the guide plate surface light source device 11 can obtain a bright and uniform surface illumination. 此外,使用本变形例导光板3的图象显示装置1能实现显示品质高质量。 Furthermore, the use of this modification the light guide plate 3, the image display apparatus 1 can achieve high display quality.

还有,通过将从导光板3的点P4、点P5至入射面4的各棱形凸起26、 26 间及25、 25间的沟26a、 25a的断面形状例如形成图19A那样实质上呈园弧形, 从而,能有效地产生光的扩散或漫反射,能进一步有效地实现导光板3射出光的亮度均匀及提高亮度。 Further, by the light guide plate from the point P4 3, the point P5 to the incident surface 4 of each prismatic projections 26, 26 and grooves 25, 25 between 26a, 25a, for example, cross-sectional shape as in FIG 19A is formed in substantially circular arc, thus, effective to produce diffusion or irregular reflection of light can be further effectively achieved luminance uniformity of light emitted from the light guide plate 3 and improve brightness.

[第6实施形态] [Sixth Embodiment]

图28A〜图28D表示本发明第6实施形态涉及的面光源装置11。 FIG 28A~ FIG. 28D showing a surface light source device of the sixth embodiment of the present invention 11. 其中,图28A表示从导光板3射出面6侧所见的平面图、图28B表示图28A的XXV1B — XXV1B线剖视图、图28C表示图28A的XXVfflC — XXVIIC线剖视图、图28D表示图28A的XXMD —XXV1D线剖视图。 Wherein FIG. 28A shows a plan view as seen from the 3 exit 6 side face of the guide, 28A of XXV1B FIG. 28B showing FIG - XXV1B line cross-sectional view, FIG. 28C showing FIG. 28A XXVfflC - XXVIIC line cross-sectional view, the XXMD FIG. 28D showing FIG. 28A - XXV1D line cross-sectional view.

该图28A〜图28D所示的面光源装置11代替前述第5实施形态涉及的导光板3背面10形成的棱形凸起27,除了用以往大家熟悉的方法将导光板3背面10表面加工粗糙这种点以外,其余和前述第5实施形态面光源装置11基本构成相同。 FIG. 28D 28A~ the surface light source device illustrated in FIG 11 instead of the prism rear surface of the light guide plate 3 according to the fifth embodiment of the projection 10 is formed 27, except that the conventional methods familiar to the back surface of the light guide plate 310 rough machining beyond this point, and the rest of the fifth embodiment of the surface light source device 11 is configured substantially the same. 因此,在本实施形态涉及的面光源装置11的说明中,对和前述第5 实施形态面光源装置11同一构成赋以同一符号,省略和前述第5实施形态重复的说明。 Accordingly, in the description of the surface light source apparatus according to the present embodiment 11, and for the fifth embodiment of the surface light source device 11 of the same configuration assigned the same reference numerals, omitting the fifth embodiment, and duplicate description. 还有,导光板3的背面10用喷砂处理、腐蚀等以往熟悉的方法将注射横型成形模具的成形面加工粗糙,通过靠注射模塑成形将经粗糙加工后的成形面复制从而使面粗糙。 Further, the rear surface 10 of the light guide plate 3 by sandblasting, etching and other methods familiar to a conventional horizontal injection molding mold surface roughening processing, so that the copy surface after surface roughening is shaped against a rough processed by injection molding .

艮P,图28A〜图28D所示本实施形态的面光源装置11在导光板3的背面10上形成大量由图29所示的微小凹凸组成的粗糙面31,由此,导光板3的背面10变粗糙。 Gen P, the surface light source device of FIG 28A~ FIG 28D of the present embodiment shown in FIG. 11 minute uneven large roughened surface 29 shown in FIG. 31 composed of the light guide plate 3 is formed on the back surface 10, whereby the rear surface, the light guide plate 3 10 roughened. 还有,粗糙面31在和导光板3射出面6侧形成的棱形凸起28 间的关系上,决定最佳的密度分度。 Further, the rough surface 31 in the prism 6 and the exit-side surface of the light guide plate 3 is formed on the projection 28 of the relationship, determine the optimal density of the indexing.

采用上述构成的本实施形态,靠发挥光散射功能的粗糙面31和棱形凸起28的迭加作用,能抑制LED5附近的射出,促使光从LED5、 5间、宽度方向两端部易变成暗部的部分射出,实现射出面6整体亮度均匀,使以往成为问题的亮线(参照图40)更不显眼。 According to this embodiment having the above structure, the light scattering function played by the rough surface of prismatic projections 31 and 28 of the superposition effect, can be suppressed near the exit LED5, causes light from LED5, 5 rooms, variable widthwise end portions emitting portion to a dark portion, to achieve the overall luminance uniformity exit surface 6, so that the conventional problem of bright line (see FIG. 40) less visible. 其结果,使用本实施形态导光板3的面光源装置ll能获得明亮、均匀的面照明(参照图1及图8)。 As a result, with the present embodiment, the light guide plate of the surface light source apparatus ll 3 to obtain a bright and uniform surface illumination (see FIGS. 1 and 8). 此外,使用本实施形态导光板3的图象显示装置1能实现显示品质高质量(参照图1及图8)。 Further, the image light guide plate 3 in this embodiment using the display apparatus 1 can realize high display quality (see FIGS. 1 and 8).

还有,本实施形态中,用印刷等以往熟悉的方法在导光板3的背面10直接形成粗糙面31,可使导光板3的背面IO粗糙。 Further, in this embodiment, by a conventional method such as printing familiar rough surface 10 is formed directly on the back surface 31 of the light guide plate 3, the back of the light guide plate can IO 3 roughness.

此外,本实施形态虽表示在导光板3的射出面6上形成棱形凸起28,在导光板3背面10形成粗糙面31使表面粗糙的样态,但并不限于此,也可在导光板3背面10侧形成棱形凸起28,用粗糙面31等使导光板3的射出面6粗糙。 Further, although the present embodiment is formed on the exit plane represents light guide plate 3 6 prismatic projection 28, the light guide plate 3 is formed in a rough surface roughened backside surface 1031 like state, but is not limited to this, and the guide 3 the back plate 10 side of the light prism protrusion 28 is formed, a rough surface 31 with the like emission surface 6 of the light guide plate 3 roughened. 还有,在导光板3射出面6上形成棱形凸起28之同时,也可在导光板3射出面6上形成粗糙面31而使面粗糙。 Further, while the projections 28 of the prism is formed on the exit surface of the light guide plate 3 6, the surface 31 may be formed on the roughened surface roughened surface of the light guide plate 3 exit 6. 也可以加上,在导光板3背面IO上形成棱形凸起28及粗糙面31,使面粗糙。 May be coupled, is formed on the back surface of the light guide plate 3 IO prism protrusions 28 and roughened surface 31, so that a rough surface. 也可再加上导光板3的射出面6和背面10 的至少一个面上形成棱形凸起28,在导光板3射出面6及背面10的两面上实施粗糙面31等的表面粗糙处理。 May also be coupled with the exit surface of the light guide plate 3 is formed at least one surface of the prismatic projection 28 and the back surface 10 of 6, Embodiment 3 on both sides roughened surface emitting surface 10 and the back surface 6 of the light guide plate 31 and the like surface roughening treatment. 这样,通过在导光板3上形成棱形凸起28和粗糙面(-〉*"夕一> 31),从而能发挥粗糙面产生的光的散射或扩散功能与棱形凸起28的光控制功能的迭加效果,能使暗区和亮线不引人注目,获得 Thus, by the projections 28 and the roughened surface is formed on the prismatic light guide plate 3 (-> * "Tokyo a> 31), so that it can control the play of light scattering or diffusing function of the light generated by the rough surface of prismatic protuberance 28 function superposition effect, dark and light lines can unobtrusive obtain

均匀明亮的面照明。 Uniform and bright surface illumination. [第7实施形态] [Seventh Embodiment]

图30A图30D表示本发明第7实施形态涉及的面光源装置。 FIG. 30A FIG. 30D showing the surface light source device of a seventh embodiment of the present invention. 其中图30A 表示从导光板3射出面6侧所见的平面图、图30B表示图30A的XXXB—XXXB 线剖视图、图30C表示图30A的XXXC —XXXC线剖视图、图30D表示图30A的XXXD — XXXD线剖视图。 Wherein as seen from FIG. 30A shows three emission-side face of the guide 6 a plan view, the line XXXB-XXXB 30A is a sectional view showing FIG 30B, and FIG. 30C showing the line XXXC -XXXC FIG. 30A is a sectional view, FIG. 30D showing XXXD of FIG. 30A - XXXD line cross-sectional view.

该图30A〜图30D所示的面光源装置11代替前述第5实施形态变形例涉及的导光板3背面10形成的棱形凸起27,除了用以往熟悉的方法将导光板3背面10表面加工粗糙这种点之外,和前述第5实施形态的变形例涉及的面光源 FIG. 30D 30A~ the surface light source device shown in FIG. 11 in place of the fifth embodiment of the modified prism light guide plate 3 according to a back surface 10 of the protrusion 27 is formed, in addition to the conventional methods familiar with the back surface 10 of the surface machining the light guide plate 3 beyond this point rough, and the modification of the fifth embodiment of the surface light source according to

装置ll基本构成相同。 Ll the same basic configuration means. 因此,在本实施形态涉及的面光源装置11的说明中, Accordingly, in the description of the surface light source apparatus 11 according to this embodiment, the

对和前述第5实施形态的变形例涉及的面光源装置11同一构成赋以同一符号, 省略和前述第5实施形态的变形例重复的说明。 And a surface light source device of a modified example of the fifth embodiment 11 according to the same configuration assigned the same reference numerals, to omit redundant description modified embodiment and the fifth embodiment. 还有,导光板的背面10用喷砂处理、腐蚀等以往熟悉的方法将注射模型成形模具的成形面加工粗糙,通过靠注射模塑成形复制其表面粗糙后的成形面,从则使面粗糙。 Further, the conventional methods familiar to the back surface of the light guide plate 10 by sandblasting, etching or the like injection molder molding die machining surface roughness, after the copy forming surface against surface roughening by injection molding so that the surface roughening from .

即,图30A〜图30D所示本实施形态的面光源装置11在导光板3的背面形成大量图29所示的微小的凹凸组成的粗糙面31,由此,导光板3的背面10变得粗糙。 That rough surface, the surface light source device of FIG 30A~ FIG 30D of the present embodiment shown in FIG 11 is formed of a large number of fine irregularities 29 shown in FIG. 3 on the back surface of the light guide plate 31 composed, whereby, the rear surface 10 of the light guide plate 3 becomes rough. 还有,粗糙面31在和导光板3射出面6侧形成的棱形凸起28间的关系上,决定最佳的密度分布。 Further, the rough surface 31 in the prism 6 and the exit-side surface of the light guide plate 3 is formed on the relationship of the projections 28 decides the optimum density distribution.

采用这种构成的本实施形态,通过发挥光散射功能的粗糙面31和棱形凸起28的迭加作用,促使光从荧光灯5A两端部附近对应的导光板3宽度方向两端部易变成暗区的部分射出,同时,能使从导光板3入射面4上下边缘4A、 4B 入射光产生的亮线不显眼,实现射出面6整体亮度均匀,提高射出光亮度。 According to this embodiment of this configuration, the projection 28 by the action of superposition rough surface 31 and the prismatic light-scattering function of play, causes the corresponding light from the vicinity of both ends of the fluorescent lamp 5A widthwise end portions of the light guide plate 3 variable emitted to a dark part region, at the same time, make the bright line generated from the upper and lower edges of the light guide plate 4 3 incident surface 4A, 4B of the incident light inconspicuous, to achieve a uniform emission face 6 overall brightness, improved brightness is emitted. 其结果,使用本实施形态导光板3的面光源装置11能获得明亮、均匀的面照明(参照图1及图8)。 As a result, with the present embodiment, the light guide plate 3 of the surface light source device 11 can obtain a bright and uniform surface illumination (see FIGS. 1 and 8). 此外,使用本实施形态导光板3的图象显示装置1能实现显示品质的高质量(参照图1及图8)。 Further, the image light guide plate 3 in this embodiment using the display apparatus 1 can realize high display quality (see FIGS. 1 and 8).

还有,在本实施形态,也可用印刷等以往熟悉的方法在导光板3的背面10 上直接形成粗糙面31,使导光板3的背面粗糙。 Further, in the conventional methods familiar to the present embodiment, printing or the like may also be formed directly on the rough surface 31 on the rear surface 10 of the light guide plate 3, the back surface of the light guide plate 3 roughened.

此外,本实施形态表示在导光板3射出面6上形成棱形凸起28,在导光板3背面10上形成粗糙面31使面粗糙的样态,但并不限于此,也可在导光板3 背面10侧形成棱形凸起28,用粗糙面31等使得导光板3的射出面6粗糙。 Further, this embodiment represents 3 formed on the prism exit face of the guide protrusion 28 6, the rough surface 31 is formed so that a rough surface of the light guide plate 3 like state on the back surface 10, but is not limited to this, and the light guide plate 3 the back surface 10 side of the prism protrusion 28 is formed with a rough surface 31 and the like so that the emission surface 6 of the light guide plate 3 roughened. 再有,可在导光板3的射出面6上形成棱形凸起28之同时,在导光板3射出面6 上形成粗糙面31并使面粗糙。 Further, while the protrusion 28 may be formed of the prism on the exit surface 6 of the light guide plate 3, forming a rough surface 31 and a roughened surface on the light guide plate 3 emission surface 6. 加上,可在导光板3背面10上形成棱形凸起28 及粗糙面31使面粗糙。 Plus, the light guide plate 3 may be formed on the back surface 10 of prismatic projections 28 and 31 so that a rough surface rough surface. 再加上,可以在导光板3射出面6的背面10中至少一个面上形成棱形凸起28,上导光板3射出面6及背面10的两面上实施粗糙面31等表面粗糙处理。 Plus, it can be formed at least one surface of the prism protrusions 28 in the back surface 6 of the light guide plate 3 emission surface 10, surface roughening treatment and other rough surfaces 31 on both sides of the light guide plate 3 embodiment emission surface 6 and the back 10. 这样,通过在导光板3上形成棱形凸起28粗糙面31,从而能发挥粗糙面的光散射或扩散功能和棱形凸起28的光控制功能迭加的效果, 能使暗区、亮线不引人注目,能获得均匀、明亮的面照明。 Thus, by forming the prism protrusions 28 on the light guide plate 3 roughened surface 31, so that it can play a light scattering or diffusing function of the roughened surface and the prismatic projections 28 of the light control function superposition effect can dark area, light line is not noticeable can be obtained a uniform, bright surface illumination.

[第8实施形态] [Eighth Embodiment]

图3A〜图3B表示的面光源装置11代替图28A〜图28D及图29所示第6 实施形态涉及的导光板3射出面6形成的棱形凸起28,除了和图15A及图15B 3A~ FIG. 3B shows a surface light source device 11 in place of FIG. 3 28A~ prism exit face of the guide of FIG. 28D and FIG. 29 relates to the sixth embodiment shown in FIG. 6 are formed protrusions 28, in addition to FIGS. 15A and 15B and FIG.

所示第2实施形态涉及的导光板3背面10形成的棱形凸起23同样的棱形凸起 As shown in the back of the prismatic light guide plate 3 according to the second embodiment of the projection 10 is formed the same prism protrusions 23

32这种点以外,因和前述第6实施形态构成基本构成相同,故对和前述第6实施形态面光源装置11同一构成赋以与前述第6实施形态面光源装置11的各构成同一的符号,省略与前述第6实施形态重复的说明。 32 other than this point, since the sixth embodiment and the configuration basically the same configuration, and so the sixth embodiment of the surface light source device 11 assigned with the same configuration with the sixth embodiment of the surface light source device constituting the same respective reference numerals 11 is omitted and the sixth embodiment repeated.

艮P,本实施形态涉及的面光源装置11在导光板射出面6上,平行形成对着导光板3的入射面4向实质上呈正交方向延伸的多条棱形凸起32,入射面4 侧的部分越近入射面4凸起高度逐渐降低,同时,棱形凸起32间的沟形断面实质上呈园弧形。 Gen P, the surface light source apparatus 11 of the present embodiment relates to a light guide plate exit plane 6, parallel incident surface facing the light guide plate 3 is formed of four projections 32 to a plurality of substantially prismatic form extending in a direction perpendicular to the incident surface portion 4 side of the incidence surface 4 near the projection height gradually decreases, while the prismatic projections 32 of the gutter-sectional shape substantially circular arc. 这种构成的面光源装置11通过将入射面4侧的部分棱形凸起32做成和第6实施形态的棱形凸起28同样的形状,从而能得到和前述第三实施形态同样的效果,同时,除此以外的部分,能使断面三角形的棱形凸起发挥聚光功能。 This surface light source device 11 is configured the same shape as the projection portion 28 by the side of the incident surface of the prism 4 made of projections 32 and the sixth embodiment prismatic, and thus can be obtained the same effects as the third embodiment , while other portions, can play a sectional triangular prism projection light condensing function. 还有,在本实施形态,和第6实施形态一样,根据LED5的配置能适当变化入射面4侧部分的棱形凸起32的高度。 Further, in the present embodiment, and, like the sixth embodiment, according to the configuration of LED5 can be appropriately changed prism 4 side portion of the incident surface 32 of the projection height.

[第9实施形态] [Ninth Embodiment]

图32A〜图32B所示的面光源装置11代替图30A〜图30D所示第7实施形态涉及的导光板3射出面6形成的棱形凸起28,除了形成和图17A及图18B所示的第2实施形态变形例涉及的导光板3背面10形成的棱形凸起23同样的棱形凸起32这种点以外,和前述第7实施形态的构成基本的构成相同,故,对于和前述第7实施形态面光源装置11同一构成赋以与前述第7实施形态面光源装置11的各构成同一符号,省略与前述第7实施形态重复的说明。 FIG 32A~ FIG. 32B instead of the surface light source device 11 shown in FIG. 3 FIG. 30D 30A~ prismatic emitting face of the guide according to a seventh embodiment of the projection 28 6 is formed, and in addition is formed as shown in FIGS. 17A and 18B same prism rear surface of the second light guide plate 3 according to a modified embodiment of the projection 10 is formed the same prism protrusions 32 beyond this point 23, and the seventh embodiment is substantially the constituent, so, and for 11 assigned with the same configuration of the seventh embodiment of each surface light source device 11 constituting the same reference numerals are omitted with the seventh embodiment described repeated a seventh embodiment of the surface light source device.

艮P,本实施形态涉及的面光源装置11在导光板3射出面6上平行形成对导光板3入射面4向实质上正交方向延伸的多条棱形凸起32,入射面4侧的部分越靠近入射面4凸起高度逐渐降低,同时,棱形凸起32间的沟形断面实质上呈园弧形,这种构成的面光源装置11通过将入射面4侧部分棱形凸起32的形状做成和第7实施形态的棱形凸起28同样的形状,从而在取得和前述第7 实施形态的棱形凸起28同样的形状,从而在取得和前述第7实施形态同样效果之同时,在除此以外的部分能使断面三角形的棱形凸起发挥聚光功能。 Gen P, aspect relates to a surface light source device 11 of the present embodiment is formed of a plurality of parallel prism incident surface of the light guide plate 3 4 extending in the direction substantially orthogonal to the projections 32 on the exit surface of the light guide plate 3 6, 4 incident surface side portion 4 closer to the incident surface projection height gradually decreases, while between the prismatic projections 32 of the gutter-sectional shape substantially circular arc, such a surface light source device constituting the incident surface 11 of the side portion 4 by the prismatic protrusion and shaped to a seventh embodiment of the prismatic projections 32 of the same shape 28, so that the projections 28 in the same prismatic shape and made of the seventh embodiment, thereby obtaining the same effect in the seventh embodiment and the same time, the other portions can play a sectional triangular prism projection light condensing function. 还有, 在本实施形态,和第7实施形态一样,根据荧光灯5A的轴线方向(长度方向) 位置能使入射面4侧的部分的棱形凸起32的高度适当地变化。 Further, in the present embodiment, and, like the seventh embodiment, a fluorescent lamp 5A according to the axial direction (longitudinal direction) enables the position of the prismatic portion 4 side of the incident surface 32 of the protrusion height appropriately changed.

[第10实施形态] [Tenth Embodiment]

图34A〜图34C表示本发明第10实施形态涉及的导光板3,表示前述图l〜 图9所示导光板3的变形例。 FIG 34A~ FIG. 34C showing the light guide plate 10 of Embodiment 3 of the present invention, showing a modified example shown in FIG. L~ the light guide plate 3 in FIG. 9. 还有,图34A表示导光板3和液晶显示屏8间关 Further, FIG. 34A showing the light guide plate 3 and the liquid crystal display 8 Off

系的纵剖视图,表示沿图34B的XXXIVA — XXIVA线切断的剖视图。 Vertical lines sectional view showing XXXIVA of FIG. 34B along - the cross-sectional view along the line XXIVA. 另外,图34B 的导光板3的平面图(射出面6法线方向视图)。 Further, a plan view of the light guide plate 34B in FIG. 3 (a normal direction of view of the emission surface 6). 此外,图34C表示导光板3 射出面6上形成的粗糙面(光漫反射的微小粗糙面区域)40的覆盖率变化(覆盖率曲线图41)。 Further, FIG. 34C showing a rough surface (a minute roughened surface region of the light diffusely reflected) 40 changes the coverage (coverage graph 41) formed on the exit surface of the light guide plate 3 6.

艮P,如图34所示,背面10形成棱形凸起39的导光板3在其射出面6上形成如图34所示覆盖率的粗糙面40。 Gen P, 34, 10 formed in the rear surface 39 of prism light guide protrusion 3 formed on the emission surface 6 of the rough surface 40 in FIG coverage 34 shown in FIG. 该粗糙面40从导光板3入射面4附近的有效发光面区域的开始位置Sl起形成,从导光线3入射面4开始至W的尺寸(LED5、 5间的距离W),形成其覆盖率增加,将离导光板3入射面4N的位置作为边界,形成其覆盖率随着离入射面4越远而徐徐低。 The rough surface 40 is formed from the start position Sl is made incident on the effective light emitting surface area of ​​the light guide plate 4 face the vicinity of the light guide 3 from the incidence surface 4 begins to W size (LED5, 5 between the distance W), which is formed coverage increased from the incident surface of the light guide plate 3 as a boundary 4N, which is formed with the cover away from the incidence surface 4 gradually low. 而且,表示该图34C 所示粗糙面40覆盖率变化的曲线全体为光滑连续的曲线。 Further, in FIG. 34C represents the rough surface 40 as shown in a graph of changes of all the coverage is smooth and continuous curve. 还有,所谓有效发光面区域为导光板3射出面6中,为了照明液晶显示屏8使用的区域,和液晶显示屏8的图象显示面积几乎同样大小的区域。 There, the so-called effective light emitting surface area of ​​the light guide plate 3 in the exit plane 6, 8 for illuminating the LCD screen area used, and the LCD 8 to display an image the same size as the area of ​​the region.

这里,离开上述导光板3入射面4W的尺寸的位置,粗糙面40覆盖率曲线的峰值位置52为相邻LED5、 5来的混合的位置,能将和导光板3入射面4平行的断面内LED5的光同样地看成作为线状光源的荧光灯的光的位置。 Here, the position of the light guide plate away from the incident surface 4W 3 dimensions, the inner cross-sectional surface of the rough position of the peak 40 of curve 52 adjacent coverage LED5, mixing 5 to the position, the light guide plate 4 and can parallel the incident surface 3 LED5 light in the same manner as the position of the fluorescent lamp as a linear light source. 而且, 该粗糙面40的覆盖率曲线峰值位置52根据LED5的特性等而变化。 Further, the peak position of the curve coverage rough surface 40 varies depending on the characteristics 52 of LED5. 因此,在本实施形态,虽将离导光板3入射面4的W的尺寸取LED5、 5间的距离,但根据LED5的特性W的尺寸值变化。 Thus, in this embodiment, although the dimension W from the incident surface of the light guide plate 3 taken LED5 4, 5 the distance, but depending on the size of LED5 W value characteristic changes.

采用这种构成的本实施形态,导光板3入射面4附近不会形成粗糙面40, 而且,来自相邻LED5、 5的光混合后从看成和荧光灯来的光同样的位置(覆盖率曲线41的峰值位置52)向入射面4通过使粗糙面40的覆盖率逐渐降低,从而因LED5的光产生V形的异常发光不引人注目,能将有效发光面积扩大至靠近入射面4的位置,能实现大面积的照明。 According to this embodiment of this configuration, the light guide plate 3 near the incident surface 4 rough surface 40 is not formed, and, from the adjacent LED5, as from fluorescent lamps and the same position of the light (curve coverage of light mixing 5 peak position 41 of 52) gradually decreases toward the incidence surface 4 by the rough surface of the cover 40, so that due to the abnormal light emitting LED5 V-shaped unobtrusive, effective light emitting area can be extended to a position close to the incident surface 4 , to achieve a large area lighting. 还有,如图34B所示,LED5的发光边界线42模式地表示则实质上呈V字形。 Further, as shown in FIG. 34B, LED5 emission mode represents the boundary line 42 is substantially V-shaped.

此外,釆用本实施形态,导光板3的断面形状为楔形,导光板3的板厚离入射面4越远则越薄。 Further, preclude the use of this embodiment, a sectional shape of a wedge light guide plate 3, a thickness of the light guide plate 3 is farther away from the incident surface 4 is thinner. 因此,导光板3内部传播的光通过在导光板3射出面6 和背面IO之间反复反射,对射出面6的入射角变化,离入射面4越远射出越容易。 Thus, the light guide plate 3 repeatedly reflected by propagating between 3 and 6 the back face of the guide exit the IO, the angle of incidence on the emission surface 6 of the change, the more long-range from the incidence surface 4 more easily. 所以,如本实施形态,来自相邻的LED5、 5的光混合,将LED5来的光看作荧光灯来的光的位置(离导光板的入射面W的尺寸的位置)作为边界,通过逐渐降低粗糙面40的覆盖率,和导光板3的楔形形状的效果相加,起到使射出光高度更加均匀的效果。 Therefore, as in this embodiment, LED5 from an adjacent, light mixing 5 to LED5 of the light seen by the position of the light of a fluorescent lamp (the position of the light guide plate from the size of the incident surface W) as the boundary, by gradually lowering the coverage of the rough surface 40, and the effect of the wedge-shaped light guide plate 3 are added, the light is emitted serves to effect a more uniform height.

此外,采用本实施形态,在导光板3的射出面6上形成粗糙面40,因为导光板3射出6被加工粗糙,故能防止配置成与导光板3射出面6对向的棱形片7、其它光控制部件的粘附,能防止因棱形片7、其它的光控制部件的粘附引起照明品位的降低(参照图1)。 Further, with the present embodiment, the rough surface 40 is formed on the emission surface 6 of the light guide plate 3, as emitted from the light guide plate 3 is roughened processing 6, it is possible to prevent the emission surface 3 arranged facing the light guide plate 6 of the prismatic sheet 7 adhering other light control member, a prism sheet 7 can be prevented due to the adhesion of other light control member causes a decrease illumination quality (see FIG. 1).

此外,釆用本实施形态,导光板3因为设计成来自其内部传播的LED5的光靠导光板3背面10形成的棱形凸起39来反射,其反射的光具有向特定方向的指向性从射出面6射出,形成不损坏由于其棱形凸起39面反射的光的指向性这种程度覆盖率的粗糙面40。 Further, it precludes the use of this embodiment, since the prism light guide plate 3 is designed to rely on the inside back surface of the light guide plate 3 from propagating LED5 formed projections 39 to 10 and the reflected light having directivity in a specific direction from emission surface 6 is emitted, since it is formed without damaging the surface of the prismatic projections 39 of light reflected by this degree of coverage of the directional rough surface 40. 还有导光板3射出面6形成粗糙面40的覆盖率的峰值,如上所述,为了不损坏由于棱形凸起39而反射的光的指向性,理想的为10%左右,但按照所要求的射出特性等设定最佳的数值。 The light guide plate 3 there is formed a peak emission surface 6 of the rough surface 40 of the cover, as described above, in order not to damage due to the prismatic projections 39 of the left and right directivity of light reflected, preferably 10%, but according to the requirements set an optimal value of the emission characteristics. 此外,图34C 所示粗糙面40的覆盖率变成将离导光板3入射面6W的位置作为边界,随着离入射面4越远而逐渐降低,但也可根据所要求的射出特性而部分增减。 Further, as shown in FIG. 34C coverage 40 becomes the rough surface will leave the position of the incident surface of the light guide plate 3 as a boundary 6W, as the distance from the incidence surface 4 gradually decreases, but also according to the required exit characteristics partially increase or decrease.

还有,本实施形态例举了只在导光板3的背面10上形成棱形凸起39的样态,但并不限于此,如图15A〜图16D、图18A〜图22、图24A〜图24D、图26A〜 图26D所示,也可在射出面6上形成棱形凸起24、 21、 26、 28的导光板3上, 形成图34C所示覆盖率的粗糙面40。 Further, the present embodiment exemplifies only the prismatic projections 39 are formed on the rear surface state of the sample 10 of the light guide plate 3 is not limited to this, as shown in FIG. 16D 15A~, 18A~ FIG. 22, FIG 24A~ FIG. 24D, FIG 26A~ FIG. 26D, may be formed on the prismatic light guide plate emission face 6 projections 24, 21, 26, 28, 3, 40 form a rough surface coverage shown in FIG. 34C. 此外,本实施的形态例举了在导光板3射出面6形成粗糙面40的样态,但并不限于此,也可在导光板3射出面6和背面IO至少一面上形成。 Further, the present form of embodiment exemplifies the light guide plate 3 is formed in a rough surface like the emission surface 6 of the 40 states, but is not limited thereto, may be formed on at least one surface of the light guide plate emission surface 3 and back surface 6 IO.

[第10实施形态的变形例] [Modification of second embodiment 10]

图35A〜图35C表示将荧光灯5A作为光源使用的第IO实施形态的变形例, 表示用图10〜图14表示的导光板的变形例。 FIG 35A~ FIG 35C shows a modification of the fluorescent lamp 5A as a light source of the IO embodiment, showing a modification of the embodiment represented in FIG. 10~ light guide plate 14 of FIG. 还有,图35A表示示意地表示导光板3和液晶显示屏8间关系的纵剖视图、表示沿图35B的XXXVA—XXXVA线切断的剖视图。 Further, FIG. 35A shows a longitudinal cross-sectional view schematically showing a relationship between the light guide plate 8 and the liquid crystal display 3, a cross-sectional view taken along line XXXVA-XXXVA of FIG. 35B is cut FIG. 此外,图35B表示导光板3的平面图(射出面6法线方向的视图)。 Further, FIG. 35B shows a plan view (the normal direction of emission surface 6 of view) of the light guide plate 3. 此外,图35C表示导光板3射出面6形成的粗糙面(使光漫反射的微小粗糙面区域)43覆盖率变化的示意图(覆盖率曲线图)。 Further, FIG. 35C showing the rough face of the guide 3 formed on the emission surface 6 (the fine rough surface region of the light diffusely reflected) a schematic view (coverage graph) 43 coverage changes.

艮口,在本变形例,导光板3射出面6上形成从其入射面4侧端部起向着导光板3的前端侧(入射面4和相反一侧)离开越远覆盖率越低的粗糙面43。 Gen mouth, in the present modification is formed (the side opposite to the incident surface and 4) farther away from the cover toward the distal end side of the lower coarse light guide plate 3 from its incident surface 4 side end portion of the light guide plate 3 on the emission surface 6 surface 43. 该粗糙面43的覆盖率曲线41A (参照图35C)在前述第10实施形态导光板3上, 变成和离入射面4W的位置和导光板3前端面(导光板3的入射面和相反一侧的面22)之间形成的覆盖率曲线部分类似的形状。 The rough surface of the cover 43 curves 41A (see FIG. 35C) in the tenth embodiment light guide plate 3, into and out of position and the incident surface of the light guide plate 3 4W front end surface (incident surface opposite to the light guide plate 3 and a coverage is formed between the curved surface portion 22 side) of a similar shape.

采用这种构成的本变形例,能防止导光板3射出面6上粘附形片7等光控 This modification of this configuration, the emission surface 3 can prevent the light guide plate 6 adhered shaped like light control plate 7

制部件,同时,和导光板3的楔形的效果相加,能使亮度更加均匀,提高照明品位(参照图10)。 Molded part, while the wedge effect of the light guide plate 3, and adding, to make more uniform brightness, improved illumination quality (refer to FIG. 10).

还有,本变形例虽例举了只在导光板3的下面10上形成棱形凸起39的样态,但并不限于此,如图17A、图17B、图23A〜图23D、图25A〜图25D、及图27A〜图27D所示,也可在射出面6上形成棱形凸起24、 21、 26、 28的导光板3上,形成图35C所示的覆盖率的粗糙面43。 Further, although the present modification example the prismatic projections 39 are formed only on the state of the sample 10 below the light guide plate 3 is not limited to this, as shown in FIG. 17A, 17B, FIG. 23D FIG 23A~, FIG. 25A to FIG. 25D, FIG. 27D and FIG 27A~ may be formed on the prismatic light guide plate emission face 6 projections 24, 21, 26, 28 of the upper 3, a cover 35C shown in FIG. 43 is a rough surface . 此外,本变形例虽例举了在导光板3的射出面6上形成粗糙面43的样态,但并不限于此,也可在导光板3 的射出面6和背面10的至少一面上形成。 Furthermore, the present modification example, although the rough surface is formed on the emission surface 6 of the light guide plate 3 like state 43, but is not limited thereto, and may be formed at least one side of the light guide plate emission face 6 and back surface 10 of the .

[第11实施形态] [Eleventh Embodiment]

本实施形态表示图1〜图7、图8、图9、图15A〜图16D、图24A〜图24D 及图31A〜图31B所示导光板(以下简称为本实施形态涉及的导光板)3的应用示例。 The present embodiment represents 1 ~ FIG. 7, FIG. 8, FIG. 9, FIG 15A~ FIG. 16D, FIG. 24D and FIG 31A~ FIG 24A~ the light guide plate shown in FIG. 31B (hereinafter referred to as the light guide plate form according to the present embodiment) 3 the application examples. g卩,上述各图所示的导光板3形成其宽度方向(沿入射面4的方向) 凸起高度几乎为一定的棱形凸起12、 23、 24、 25、 26、 32,使入射面4附近的射出光明暗之差模糊不清,能使LED5来的光略带V字形的异常发光不引人注目,就能实现射出面6射出的光均匀。 g Jie, above the light guide plate 3 shown in the figures is formed in the width direction thereof (the direction of the incidence surface 4) the height of projections is almost constant prismatic projections 12, 23, 24, 25, 26, 32, the incident surface light 4 emitted from the difference of close to obscure the dark, the abnormality can be LED5 slightly V-shaped light emitting unobtrusive, can achieve a uniform light emitted from the emission surface 6.

因此,本实施形态的导光板3例如如图36所示了将发光颜色不同的两种LED51、 52在导光板3的宽度方向交错配置,即使在有选择地使两种LED51、 52发光,用两种不同颜色照明的场合,也仍能有效地防止入射面4附近的异常发光,能射出均匀的照明光。 Accordingly, in this embodiment the light guide plate 36 shown in FIG. 3, for example, a different two kinds of emission colors LED51, 52 staggered in the width direction of the light guide plate 3, so that even if two kinds of selective LED51, 52 emit light, with two different colors of illumination settings, still effectively prevent abnormal emission in the vicinity of the incidence surface 4, capable of emitting uniform illumination light. 即,本应用例涉及的导光板3即使将LED51、 52 放在宽度方向上任何位置,仍能抑制LED51、 52特有的异常发光的产生,能获得均匀的照明。 That is, the light guide plate 3 according to the present application example, even if the LED 51, 52 is placed anywhere in the width direction, still inhibiting LED51, 52 produce luminescence specific exceptions, homogeneous illumination can be obtained.

此外,本实施形态涉及的导光板3,如图37所示,将发红(R)、绿(G)、 兰(B)各种颜色的LED53、 54、 55配置成与入射面4对向,通过使这些三色的LED53〜55同时发光,射出白色照明光的场合,或通过调谐构成这些三色LED53〜55的灯亮周期和液晶显示屏的0N • OFF周期,在试图省略彩色滤色器的场合,能不受LED53〜55配置位置所限,射出均匀的照明光。 Further, according to the present embodiment forms the light guide plate 3, shown in Figure 37, the red (R), green (G), blue (B) colors of LED53, 54, 55 arranged to the incident plane 4 pairs 0N • OFF period, by LED53~55 light simultaneously emits white illumination light occasions these three colors, or three colors constituting these lights LED53~55 by tuning cycle and LCD, color filters are omitted in attempting to the case can be arranged without LED53~55 limit position, emitting uniform illumination light.

[第12实施形态] (第l例) [Twelfth Embodiment] (Example of l)

图38表示本发明的第12实施形态,表示配置在如图1所示导光板3射出面6侧的棱形片7棱形凸起13—样态断面形状的局部放大图。 38 shows a first embodiment 12 of the present invention, showing the configuration like protrusion 13- enlarged view of the state of the prismatic cross-sectional shape of the light guide plate prism sheet 7 shown in FIG. 13 side of the emission surface 6 in FIG. 这里,棱形片7 的棱形凸起13为在几乎沿导光板3的入射面4的方向延伸设置,在与导光板3的入射面4几乎正交的方向上平行连续形成多条。 Here, the prism sheet 7 prism protrusions 13 in a direction almost along the guide plate 3 of the incident surface 4 extending parallel with the plurality of continuously formed with the incident surface in a direction almost perpendicular to the light guide plate 4 3. 还有,图38表示沿与导光板3入射面4正交的方向将棱形片7切断的剖视图。 Further, FIG. 38 shows a sectional view taken along the direction of the light guide plate 3 perpendicular to the incident surface 4 of the prism sheet 7 is cut. 而且,该实施形态的棱形片7以使用PMMA形成的为例予以说明。 Further, this embodiment prismatic PMMA sheet 7 is formed using an example will be described.

图38所示的棱形凸起13谋求提高对特有导光板3射出面6射出的指向性的光的反射功能,能强化向导光板3射出面6的实质上法线方向反射的功能, 能更进一步提高照明光的亮度(参照图l)。 Prismatic projections 13 shown in FIG. 38 to be improved specific function of the light guide plate reflection directivity of the emission surface 6 3 emitted enhancements can be reflected by the substantially normal direction of the emission surface 3 of the guide plate 6 can be more further improve the brightness of illumination light (see FIG. l).

艮卩,该图38所示的棱形凸起13由从凸起前端开始徐徐地间距拉开的一个面60和另一个面65构成。 Gen Jie, prismatic projection 38 shown in FIG. 13 to a surface by a distance gradually opened from the distal end of the projection 60 and the other surface 65. 其中,主要为入射面的面65是一平面,主要为反射面的面60由倾角不同的第1斜面60a和第2斜面60b两平面构成。 Wherein the major surface 65 is the incident surface is a flat surface 60 of the main reflection surface different from the inclination of the first inclined surface 60a inclined surface 60b and two second planar configuration. 在该棱形凸起13的面60上,第l斜面60a对于导光板3射出面6法线方向(以下, 仅简称为法线方向)61,以34.0°的角度形成,第2斜面60b对法线方向61, 以30. 5°的角度形成,形成棱形凸起13的顶角成68° 。 The prismatic projections 13 on surface 60, the inclined surface 60a of the light guide plate 6 l normal direction of the emission surface 3 (hereinafter simply referred to as a normal direction) 61 is formed at an angle of 34.0 °, the second inclined surface 60b of the normal direction 61 to 30. 5 ° angle is formed, forming an apex angle prism 13 into a projection 68 °. 而且,第1斜面60a 的形成区域设棱形凸起13的根部断面长度(棱形凸起间长度)为1,则形成向与法线方向61正交的面的投影长度为0. 308。 Further, the first inclined surface 60a forming region provided prismatic projection root section length (length between the prism projection) 13 is 1, the length of the projection surface is formed perpendicular to the normal direction 61 is 0.308. 此外,第2斜面60b的形成区域设棱形凸起长度根部的断面长度(棱形凸起13、 13间的长度)为1,则形成向与法线方向61正交的面的投影长度为0. 179 (0. 487〜0. 308)。 Further, the second inclined surface 60b forming a cross-sectional area disposed prismatic projection root length (longitudinal prismatic projection 13, 13) is 1, is formed to the normal direction 61 perpendicular to the plane of projection length 0.179 (0.5 487~0. 308). 还有,棱形凸起13的高度设棱形凸起13的根部断面长度为1,则形成为0. 761。 Also, the height of prism protrusions 13 provided prismatic projection length of the root section 13 is 1, is formed of 0.761.

这样的棱形凸起13形成的棱形片7在将从导光板3的射出面6对法线方向61以约70°的倾角射出的光作为主射光的场合,当然,在大致法线方向反射该主射出光62,在主射出光62的周围,展宽并射出的光(副射出光)也在近法线方向61上射出。 Such prism protrusions 13 formed on prismatic sheet 7 6 normal direction of the light guide plate 3 from the emission surface 61 at an angle of about 70 ° of the light emitted as a main outgoing light situations, of course, in a substantially normal direction the main reflector 62 emits light, the emitted light around the main exit 62, and the broadening of the emitted light (sub-light-emitting) 61 are near normal direction. 即,对于主射出光62的倾角为了使(70° — 9 1)的角度范围内的射出光及(70° +9 2)的角度范围内的射出光64尽可能多地靠近法线方向61反射,故形成上述第l斜面60a及第2斜面60b。 That is, the inclination angle of the primary emitted light 62 in order to make (70 ° - 9 1) emits light and the emitted (70 ° +9 2) within the angle range of the angle range of the light 64 as much as possible close to the normal direction 61 reflection, so that inclined surface 60a forming the first and second bevel l 60b. 采用这样的构成, 和棱形凸起13面60的倾角取单一(例如:34.0° )时相比,能在近法线方向射出更加多的光,提高射出光亮度。 Compared, more and more light can be emitted in the normal direction near: (34.0 °, for example), to improve the brightness of the light emitted from such a configuration, the prism protrusions 13 and surface 60 to take a single angle. 还有,在该第1例中,棱形凸起13的另一面65为对于法线方向61倾斜34.0。 Further, in this first embodiment, the prismatic projections 65 of the other surface 13 is inclined to the normal direction 61 34.0. 的斜面,成为导光板3射出的光的入射面或反射面。 Slope, becomes incident surface or the reflection surface of the light guide plate 3 is emitted.

(第2例) (Second example)

图39表示棱形片7的棱形凸起13的第2例。 39 shows a prism sheet 7 prismatic projections 13 of the second example. 该图39所示的棱形凸起13 由面60及另一面65由第1斜面60a、 65a和第2斜面60b、 65b的两平面组成, 变成面60及另一面65将凸起前端(顶点)作为中心左右对称的形状。 The prism 39 shown in FIG. 13 by the projection 60 and the other side surface 65 by the first inclined surface 60a, 65a and a second inclined surface 60b, 65b composed of two planes, and the other surface 60 into the protrusion front end surface 65 ( vertex) as the center of the left and right symmetrical shape. 而且,以34.(T的角度形成对于棱形凸起13面60及另一面65的第1斜面60a、 65a 的法线方向61的倾角。以对法线方向61,30.5°的角度形成第2斜面60b、65b, 形成棱形凸起13的顶角为68° 。该棱形凸起13面60及另一面65 —起作为入射面及反射面起作用。还有,第l斜面60a、 65a、第2斜面60b、 65b的倾角和前述第l例相同。但,本例的棱形凸起13的第l斜面60a、 65a的形成区域设棱形凸起13的根部断面长度(棱形凸部13、 13间长度)为1,则形成向与法线方向61正交的面投影长度为0.316。此外,第2斜面60b、 65b的形成区域设棱形凸起13根部的断面长度(棱开凸起13、 13间长度)为1,则形成向与法线方向61正交的面投影长度0. 184(0. 5〜0. 316)。此外,棱形凸起13的凸起高度设棱形凸起13的根部断面长度为1,则形成为0. 781。 Further, to 34. (T angle prism protrusions 13 are formed to face the first inclined surface 60 and the other side 65 of the 61 normal direction 60a, 65a inclination. Angles to the normal direction is formed on 61,30.5 ° further, since the l inclined surface 60a and a reflection surface as the incident surface of the work, - 2 inclined surface 60b, 65b, forming an apex angle prism protrusions 13 of projection 13 68 ° to the prismatic surface 60 and the other surface 65. 65a, the second inclined surface 60b, 65b and the same angle of inclination of Example l. However, this embodiment prismatic protrusion inclined surface 13 of the l 60a, 65a formed in the region of the root section in a longitudinal projection disposed prism (prism 13 convex portion 13, length 13) is 1, the length of the plane projection is formed perpendicular to the normal direction 61 is 0.316. Further, the second inclined surface 60b, 65b formation region provided prismatic projection section 13 root length ( open rib projection 13, length 13) is 1, is formed to the surface of the projection 61 orthogonal to the normal direction of length 0.184 (0. 5~0. 316). Further, the projection 13 of the prismatic projection the height of the prismatic projection 13 is provided the length of the root section 1, is formed of 0.781.

这种形状的棱形凸起13的棱形片7当然能获得和第1例同样的效果,不仅从导光板3入射面4側向前端面(和入射面相反一侧的侧面22)侧的光中的射出光。 Prismatic projections prism sheet 713 can be obtained and, of course, the same effect as the first example, not only from the front end surface 3 is incident face side of the light guide plate 4 (opposite to the side surface and the incident surface 22) side of this shape light emitted light. 而且在导光板3前端面(22)反射后,向入射面4侧的光中的射出光也能有效地向法线方向61发射,能进一步提高射出光亮度(参照图l)。 3 and in the front end face of the guide (22) after reflection, 61 can be efficiently emitted in the normal direction of the light emitted from the light incident surface 4 side of the light emission luminance can be further improved (refer to FIG. L).

此外,本第2例的棱形片7因图39所示的棱形凸起13的形状为左右对称的形状,故较左右不对称的第1例的棱形片7更容易成形。 Further, as shown in FIG. 39 because of prismatic according to the second embodiment of the prism sheet 7 convex shape 13 is bilaterally symmetrical, it is more left-right asymmetry of the first embodiment of the prism sheet 7 is more easily formed.

还有,上述第1例及第2例中,有关棱形凸起13的各种数值,为易于理解而作的简单示例,本发明的棱形片并不限于上述这些各种数值。 Further, the above-described first and second examples, the various values ​​relating to prism protrusions 13, as a simple example for ease of understanding, the prism sheet according to the present invention is not limited to these various values. 例如,棱形凸起13的第1斜面60a、 65a及第2斜面60b、 65b的倾角可根据导光板3的射出特性、棱形片7的材质等诸多条件设定合适的最佳角度,此外,其第l斜面60a、 65a及第2斜面60b、 65b的反射方向也不只限于法线方向61,根据所要求的设计条件等设定合适的最佳反射方向。 For example, the first prismatic projections 13 of the inclined surface 60a, 65a and second inclined surfaces 60b, 65b of the angle characteristics of the light guide plate 3 according to the emitted and material of the prismatic sheet 7 set various conditions suitable best angle, in addition which the l inclined surface 60a, 65a and second inclined surfaces 60b, 65b of the reflection direction is not limited to the normal direction 61, set an appropriate direction according to the design optimum reflection conditions required. 即,图38所示的例中,射出光63的射出方向对于法线方向倾斜,变成射先光63的射出方向对于法线方向倾斜,变成射先光64的射出方向为对象,这样的射出特性在取得均等的视角扩宽方向相当理想,但在希望进一步提高法线方向亮度的场合,能设定其倾斜角度,使得第2斜面60b、 65b反射的大部分射出光63在和射出光62几乎平行的法线方向射出。 That is, in the embodiment shown in FIG. 38, the emission direction of the emitted light 63 is inclined to the normal direction, emitted into the first light emission direction 63 inclined with respect to the normal direction, the first shot into the direction of light 64 is emitted from the object, so that obtaining characteristic emitted uniformly over the viewing angle widening considerably direction, but further improvement in the brightness in the normal direction occasion, the inclination angle thereof can be set, so that the second inclined surface 60b, 65b of the reflector 63 is emitted in the most light is emitted and 62 nearly parallel light is emitted in the normal direction.

此外,本实施形态的棱形片7并不限于第1例及第2例棱形凸起13的形状,也可以做成使棱形凸起13的面60、或面60及另一个面65在多层上(两层以上)倾斜,或用光滑的曲面形成。 Further, the present embodiment is not limited to the prism sheet 7 of the first and second examples prismatic convex shape 13 can also be made that the prismatic projections 13 of surface 60, surface 60 or surface 65 and the other on the multilayer (two or more) inclined or a smooth curved surface formed. (其它的实施形态) (Other Embodiment)

上述各实施形态中,导光板3的内部也可掺入和导光板3折射率不同的材料组成的微粒。 In the above embodiments, the light guide plate 3 may also be incorporated into the microparticles and the refractive index of the light guide plate 3 is composed of a different material.

此外,上述各实施例的形态及变形例中,也可将导光板3背面IO侧或射出面6侧这两个面中至少一个面的棱形凸起12、 20、 21、 23、 24、 25、 26、 27、 28、 32表面的微小区域作为漫反射光的微小的凹凸面,以适当的图案形成大量的该微小区域。 In the above embodiment and the modified example of the embodiments, the light guide plate 3 may also be the back-side IO or exit surface 6 side of both side surfaces of the at least one prismatic projection 12, 20, 21, 23, 24, 25, 26, 27, 28, 32 minute region of the surface of the minute uneven surface as diffuse reflected light, a suitable patterning a large number of the minute region.

此外,特别是在第2〜第7实施形态及其各变形例上,导光板3背面10侧形成的凸起中,至少,从位置P0〜P5向入射面4的部分的凸起及/或在射出面6侧形成的凸起也可将其端部做成园形使其顶部不显现棱线。 Furthermore, especially in the first 2 ~ seventh embodiment and its modification, the back surface 10 side of the light guide plate 3 is formed in the projection, at least, from the convex portion toward the incident surface P0~P5 position 4 and / or projections formed on the side of the emission surface 6 may be made of an end portion of the circular ridge line so that the top does not appear.

此外,本发明并不限于上述各实施形态,第2〜第5实施形态及其各变形例的射出面6侧的棱形凸起21、 24、 26、 28可在导光板3的背面10侧形成, 第2〜第5实施形态及其各变形例背面10侧的棱形凸起20、 23、 25、 27可在导光板3的射出面6侧形成。 Further, the present invention is not limited to the above embodiment, the first prism 2 ~ fifth embodiment and its modified embodiment emission surface 6 side of the projections 21, 24, 26, 28 may be the back surface 10 side of the light guide plate 3 forming a first prism 2 ~ fifth embodiment and its modified embodiment of the back surface 10 side of the projections 20, 23, 25, 27 may be formed on the emission surface 6 side of the light guide plate 3.

此外,在第2〜第5实施形态及其各变形例上也能如第1实施形态那样, 将棱形凸起20、 23、 25、 27的形的面的入射面4附近做成平面。 Further, in the first 2 ~ fifth embodiment and its modification can be as in the first embodiment above, the prism protrusions 20, 23, made flat near the incident surface of the shaped surface 25, 27 4.

此外,本发明并不限于上述各实施形态,例如,可在导光板3射出面6上形成第3实施形态中曾例举过的棱形凸起20、21中射出面6侧的棱形凸起草1, 在导光板3的背面10上形成第4实施形态曾例举过的棱形凸起25、 26中背面10侧的棱形凸起25、又可以将第1〜第4实施形态中曾例举过的各棱形凸起12、 20、 21、 23、 24、 25、 26、 27、 28适当组合形成导光板3。 Further, the present invention is not limited to the above embodiments, for example, may be formed in the third embodiment has exemplified through the prism protrusions 20 and 21 exit-side surface of the prismatic projections 6 on the exit surface of the light guide plate 3 6 drafting 1, the light guide plate 3 is formed on the back surface 10 of the fourth embodiment has exemplified through the prism protrusions 25, 26 in the prismatic projections 10 the back side 25, and 1 ~ of the fourth embodiment may be in each example had had prismatic projections 12, 20, 21, 23, 24, 25, 26, 27, 28 form a suitable combination of the light guide plate 3.

此外,上述各实施形态中虽然曾列举了各条棱形凸起沿着导光板的入射面连续形成的例子,但本发明也可择需沿入射面断续地形成棱形凸起,各凸起间形成平坦的部分。 Further, although the above embodiment has exemplified the example of the pieces of prismatic projections continuously formed along the incidence surface of the light guide plate, but the present invention may also choose for an intermittently formed along the incidence surface of the prism projections, each projection from between the flat portion is formed. 这时,凸起间的沟形为所谓断面实质上呈园弧形的形状,系指包括这样的平坦部分,形成凸起的斜面描划出平缓的曲线并在该平坦的部分连续的形状。 In this case, groove-shaped protrusions between a so-called cross-sectional shape of a substantially circular arc, the means includes a flat portion, a convex chamfer is formed to draw a gentle curve and describe the shape of the continuous flat portion.

此外,在上述第4实施形态中,曾列举了使棱形凸起25、 25间的沟25a 及棱形凸起26、 26间的沟26a直线状倾斜的样态,但并不限于此,也可通过以平缓的曲线形成沟25a、 26a,使棱形凸起25、 26的凸起高度变化。 Further, in the fourth embodiment, that the prismatic protrusion has cited prismatic grooves 25a and 25, the groove 25 between the projections 26, 26 of the sample 26a linearly inclined state, not limited to this, It may also be formed by grooves in a gentle curve 25a, 26a, so that the prismatic projection 25, the projection 26 of the height variation. 此外, 上述第5实施形态上,曾列举了使棱形凸起27、 27间的沟27a及棱形凸起28、 28间的沟28a直线状倾斜的样态,但并不限于此,也可通过用平缓的曲线形成沟27a、 28a,从而使棱形凸起27、 28的凸起高度变化。 Further, the above-described fifth embodiment, so that the prismatic protrusion has cited prismatic grooves 27a and 27, the groove 27 between the projections 28, 28 between 28a linearly inclined like state, but is not limited to this, by forming grooves 27a with a gentle curve, 28a, so that the prismatic projection 27, the projection 28 of the height variation.

此外,在上述各实施形态及其变形例上,虽然导光板3其图1的II一II断 Further, in the foregoing embodiments and the modification, although the light guide plate 3 which II of FIG. 1 a broken II

面、图18A的XVIDB —XVIDB断面实质上呈楔形,但并不限于此,图1的II 一II 断面、图18A的XW1B — XVII1B断面也可为矩形。 Surface, XVIDB -XVIDB sectional view 18A is substantially wedge-shaped, but not limited to, II II of FIG. 1 is a cross-sectional, XW1B FIG. 18A - XVII1B section may also be rectangular. 此外,对形成为中央板板厚薄, 并在对向的两侧向板厚变厚的导光板各实施形态的技术思想也可以适用。 In addition, the central plate board thickness is formed, and both sides in the thickness direction of the light guide plate thickened technical idea form various embodiments may be applied. 在这样的场合,也可做成在对向的两侧面上分别配置作为光源的LED5、荧光灯5A。 In such a case, it can also be made in LED5, on both sides of the fluorescent lamp 5A are arranged as a light source. 此外,上述实施形态列举了使两个或3个LED5对向导光板3入射面4配置的样态,但并不限于此,可根据导光板3的大小等决定LED5配置的个数,可以将LED5配置成单数或4个以上。 Further, the above embodiment exemplified the two or three LED5 like state of the incident surface of the light guide plate 3 4 arranged, not limited to this, can size the light guide plate 3 is determined according to the number of LED5 configuration may be LED5 configured as a single number or four or more.

此外,在上述各实施形态,曾列举将LED5与导光板3的入射面4对向并配置在入射面(侧面)4侧的样态(参照图2及图18A),如图33所示,可做成导光板3倾斜的侧面4a侧处与背面10对向的一侧上配置LED5,用侧面4a 反射LED5来的光取入导光板3的内部。 Further, in the above embodiment, exemplified was LED5 and the incident surface of the light guide plate 3 and 4 arranged facing the incident surface (side face) 4 side like state (see FIG. 2 and FIG. 18A), shown in Figure 33, the light guide plate 3 can be made inclined side face 4a LED5 disposed at the back surface side on one side of the 10 pairs of LED5 to the side surface of the light guide plate 3 taken 4a of the reflector.

如上所述,本发明使用LED作为光源,在导光板的射出面和其相反的一侧的面这两个面中至少一个面上形成多条棱形凸起,通过从导光板的LED所配置的侧面附近开始向远去的方向延伸设置的棱形凸起在其形成处、或其凸起高度上想办法,从而能使导光板前述侧面附近产生的异常发光不引人注目,从导光板的射出面射出的亮的亮度均匀,获得均匀的照明。 As described above, the present invention is the use of LED as a light source, at least a plurality of prism formed on the exit face of the guide and its surface opposite the two faces of a projection surface, by the configuration of the light guide plate from the LED prismatic side surface in a direction away near the beginning of the extended projections formed at the height of the projections or find ways, thereby enabling the abnormal light emission generated near the side surface of the light guide plate is not noticeable, from the light guide plate the exit surface of the light uniform brightness, uniform illumination is obtained.

Claims (13)

1.一种面光源装置,包括: 具有侧面和射出面的导光板;以及配置在所述导光板的侧面的点光源,所述光源发出的光射入导光板后在导光板内传播,在该传播过程中,对着所述射出面的入射角度成临界以下的光从导光板的射出面射出, 其特征在于, 在所述导光板的射出面及与其相反一侧的面这两个面中的一个面上,沿着所述侧面平行形成多条从所述侧面向着远去的方向延伸设置的第一棱形凸起, 所述侧面侧的所述第一棱形凸起的部分具有越靠近所述侧面、凸起高度逐渐降低的倾向, 在所述导光板的射出面及与其相反一侧的面这两个面中的另一个面上也形成与所述第一棱形凸起同样的第二棱形凸起, 所述导光板的射出面及与其相反一侧的面这两个面中的所述一个面在所述侧面的附近为平面。 1. A surface light source device, comprising: a light guide plate having a side surface and the exit surface; and a point light source disposed on a side of the light guide plate, the light propagating within the light guide plate in the incident light emitted from the light guide plate, in the propagation process, the exit surface facing the incident angle to the light emitted from the emission of the following critical face of the guide, characterized in that, in the light guide plate exit surface and the opposite surface of the two side surfaces one surface of a first prism is formed in the direction away from the side surface provided to extend along a plurality of parallel sides of the projection, the side surface of the first portion having a prismatic protrusion closer to the side surface, the projection height gradually decreasing tendency, the other surface of the light guide plate exit surface and the opposite surface of the two side surfaces of the projection are also formed with the first prism the same second prism protrusions exit surface of the light guide plate and its surface opposite said one surface of both surfaces in the vicinity of the side surface is flat.
2. —种面光源装置,包括: 具有侧面和射出面的导光板;以及配置在所述导光板的侧面的点光源,所述光源发出的光射入导光板后在导光板内传播,在该传播过程中,对着所述射出面的入射角度成临界以下的光从导光板的射出面射出,其特征在于,在所述导光板的射出面及与其相反一侧的面这两个面中的一个面上,沿着所述侧面平行形成多条从所述侧面向着远去的方向延伸设置的第一棱形凸起,所述侧面侧的所述第一棱形凸起的部分具有越靠近所述侧面、凸起高度逐渐降低的倾向,在所述导光板的射出面及与其相反一侧的面这两个面中的另一个面上也形成与所述第一棱形凸起同样的第二棱形凸起,所述第一棱形凸起至少在所述侧面的附近,在所述点光源的光轴上凸起高度为最小,从所述点光源的光轴向着沿所述侧面平行的方向离开越远凸起高度逐 2. - seed surface light source device, comprising: a light guide plate having a side surface and the exit surface; and a point light source disposed on a side of the light guide plate, the light propagating within the light guide plate in the incident light emitted from the light guide plate, in the propagation process, the exit surface facing the incident angle to the light emitted from the emission of the following critical face of the guide, characterized in that, in the light guide plate exit surface and the opposite surface of the two side surfaces one surface of a first prism is formed in the direction away from the side surface provided to extend along a plurality of parallel sides of the projection, the side surface of the first portion having a prismatic protrusion closer to the side surface, the projection height gradually decreasing tendency, the other surface of the light guide plate exit surface and the opposite surface of the two side surfaces of the projection are also formed with the first prism the same second prism projections, at least near the first prism protrusions on the side surface, the projection height on the optical axis of the point light source is minimum, from the point light source toward the optical axis direction of the parallel sides by the height of the projection farther away 渐增高。 Increasing high.
3. —种面光源装置,包括: 具有侧面和射出面的导光板;以及配置在所述导光板的侧面的点光源,所述光源发出的光射入导光板后在导光板内传播,在该传播过程中,对着所述射出面的入射角度成临界以下的光从导光板的射出面射出,其特征在于,在所述导光板的射出面及与其相反一侧的面这两个面中的一个面上,沿着所述侧面平行形成多条从所述侧面向着远去的方向延伸设置的第一棱形凸起,所述侧面侧的所述第一棱形凸起的部分具有越靠近所述侧面、凸起高度逐渐降低的倾向,在所述导光板的射出面及与其相反一侧的面这两个面中的另一个面上也形成与所述第一棱形凸起同样的第二棱形凸起,所述第二棱形凸起形成离所述侧面越远凸起高度逐渐降低并且在离开所述侧面规定距离处其凸起高度变为零。 3 - Species surface light source device, comprising: a light guide plate having a side surface and the exit surface; and a point light source disposed on a side of the light guide plate, the light propagating within the light guide plate in the incident light emitted from the light guide plate, in the propagation process, the exit surface facing the incident angle to the light emitted from the emission of the following critical face of the guide, characterized in that, in the light guide plate exit surface and the opposite surface of the two side surfaces one surface of a first prism is formed in the direction away from the side surface provided to extend along a plurality of parallel sides of the projection, the side surface of the first portion having a prismatic protrusion closer to the side surface, the projection height gradually decreasing tendency, the other surface of the light guide plate exit surface and the opposite surface of the two side surfaces of the projection are also formed with the first prism the same second prism projection, the second projection is formed from the prism side surface projection height gradually decreases farther away from the side surface and at a predetermined distance from the projection height which becomes zero.
4. 如权利要求3所述的面光源装置,其特征在于,所述第二棱形凸起包括相邻的凸起间的沟形形成断面实质上呈圆弧形的部分。 4. The surface light source device according to claim 3, characterized in that said second prismatic projection grooves between adjacent projections comprises a substantially circular arc-shaped cross section forming part.
5. 如权利要求3或4所述的面光源装置,其特征在于, 所述第二棱形凸起至少在所述侧面附近,在所述点光源的光轴上的凸起高度最小,随着从所述点光源的光轴向着沿所述侧面平行的方向离去凸起高度逐渐增高。 5. The surface light source device of claim 3 or claim 4, wherein said second prism protrusions at least in the vicinity of the side face, the projection height minimum on an optical axis of the point light source, with the direction from the optical axis toward the point light source along the parallel sides leaving the projection height gradually increasing.
6. 如权利要求3或4所述的面光源装置,其特征在于, 所述第一棱形凸起至少在所述侧面附近,在所述点光源的光轴上的凸起高度最小,随着从所述点光源光轴向着沿所述侧面平行的方向离去凸起高度逐渐增高。 6. The surface light source device of claim 3 or claim 4, wherein said first prism protrusions at least in the vicinity of the side face, the projection height minimum on an optical axis of the point light source, with the direction from the point light source toward the optical axis direction of the parallel sides leaving the projection height gradually increasing.
7. 如权利要求6所述的面光源装置,其特征在于,所述第二棱形凸起至少在所述侧面附近,在所述点光源的光轴上的凸起高度最小,随着从所述点光源的光轴向着沿所述侧面平行的方向离去凸起高度逐渐增高。 7. The surface light source device according to claim 6, wherein said second prism protrusions on the side close to at least a minimum height in the projection optical axis of the point light source, as from the point light source toward the optical axis leaving the projection height gradually increasing in a direction parallel to said side.
8. —种面光源装置,包括: 具有侧面和射出面的导光板;以及配置在所述导光板的侧面的棒状光源,所述光源发出的光射入导光板后在导光板内传播,在该传播过程中,对着所述射出面的入射角度成临界以下的光从导光板的射出面射出,其特征在于,在所述导光板的射出面及与其相反一侧的面这两个面中的一个面上,沿着所述侧面平行形成多条从所述侧面向着远去的方向延伸设置的第一棱形凸起,所述侧面侧的所述第一棱形凸起的部分具有越靠近所述侧面、凸起高度逐渐降低的倾向,在所述导光板的射出面及与其相反一侧的面这两个面中的另一个面上也形成与所述第一棱形凸起同样的第二棱形凸起,所述导光板的射出面及与其相反一侧的面这两个面中的所述一个面中所述侧面的附近为平面。 8. - kind of the surface light source device, comprising: a light guide plate having a side surface and the exit surface; and a light source disposed on a side of the rod-shaped light guide plate, the light propagating within the light guide plate in the incident light emitted from the light guide plate, in the propagation process, the exit surface facing the incident angle to the light emitted from the emission of the following critical face of the guide, characterized in that, in the light guide plate exit surface and the opposite surface of the two side surfaces one surface of a first prism is formed in the direction away from the side surface provided to extend along a plurality of parallel sides of the projection, the side surface of the first portion having a prismatic protrusion closer to the side surface, the projection height gradually decreasing tendency, the other surface of the light guide plate exit surface and the opposite surface of the two side surfaces of the projection are also formed with the first prism the same second prism protrusions, the light guide plate exit surface and the opposite surface side close to the one surface of the two surfaces of said side surface is flat.
9. 一种面光源装置,包括: 具有侧面和射出面的导光板;以及配置在所述导光板的侧面的棒状光源,所述光源发出的光射入导光板后在导光板内传播,在该传播过程中,对着所述射出面的入射角度成临界以下的光从导光板的射出面射出,其特征在于,在所述导光板的射出面及与其相反一侧的面这两个面中的一个面上,沿着所述侧面平行形成多条从所述侧面向着远去的方向延伸设置的第一棱形凸起,所述侧面侧的所述第一棱形凸起的部分具有越靠近所述侧面、凸起高度逐渐降低的倾向,在所述导光板的射出面及与其相反一侧的面这两个面中的另一个面上也形成与所述第一棱形凸起同样的第二棱形凸起,所述第一棱形凸起至少在所述侧面的附近,在所述棒状光源的两端部附近沿着向所述棒状光源对应端部侧的方向凸起高度逐渐增高。 A surface light source device, comprising: a light guide plate having a side surface and the exit surface; and a light source disposed on a side of the rod-shaped light guide plate, the light propagating within the light guide plate in the incident light emitted from the light guide plate, in the propagation process, the exit surface facing the incident angle to the light emitted from the emission of the following critical face of the guide, characterized in that, in the light guide plate exit surface and the opposite surface of the two side surfaces one surface of a first prism is formed in the direction away from the side surface provided to extend along a plurality of parallel sides of the projection, the side surface of the first portion having a prismatic protrusion closer to the side surface, the projection height gradually decreasing tendency, the other surface of the light guide plate exit surface and the opposite surface of the two side surfaces of the projection are also formed with the first prism the same second prism projections, at least near the first prism protrusions on the side surface, the direction of projection to a corresponding side end portion of the rod-shaped light source in the vicinity of both ends of the rod-shaped light source height gradually increased.
10. —种导光板,包括:侧面,从点光源发出的光从该侧面入射;以及射出面,入射到所述侧面的光在所述导光板内传播的过程中,对射出面的入射角在临界角以下的光从射出面射出, 其特征在于, 在所述射出面及与其相反一侧的面这两个面中的一个面上,沿着所述侧面平行形成多条向着远离所述侧面的方向延伸设置的第一棱形凸起,所述侧面侧的所述第一棱形凸起的部分具有越靠近所述侧面、凸起高度逐渐降低的倾向,在所述导光板的射出面及与其相反一侧的面这两个面中的另一个面上也形成与所述第一棱形凸起同样的第二棱形凸起,所述导光板的射出面及与其相反一侧的面这两个面中的所述一个面中所述侧面的附近为平面。 10. - kind of the light guide plate, comprising: a side surface, light emitted from the point light source is incident from the side surface; and the exit surface, the light incident on the side surface of the light guide plate propagate in the process, the incident angle of the exit plane the light emitted below the critical angle from the emission surface, characterized in that one of the face of the two faces and the exit surface opposite thereto is formed along a plurality of remote from said side toward the parallel a first side surface extending in the direction of prismatic projections provided, said first side surface of the prismatic protrusion portion closer to the side surface has a tendency, decreasing the height of the projections, the emitted light guide plate surface and the opposite surface of the other surface side of the two surfaces of the prismatic projections are also formed in the same second and the first prism protrusions, the light guide plate exit surface and the opposite side both surfaces of the one surface in the side surface near the plane.
11. 一种导光板,包括:侧面,从点光源发出的光从该侧面入射;以及射出面,入射到所述侧面的光在所述导光板内传播的过程中,对射出面的入射角在临界角以下的光从射出面射出, 其特征在于,在所述射出面及与其相反一侧的面这两个面中的一个面上,沿着所述侧面平行形成多条向着远离所述侧面的方向延伸设置的第一棱形凸起,所述侧面侧的所述第一棱形凸起的部分具有越靠近所述侧面、凸起高度逐渐降低的倾向,在所述导光板的射出面及与其相反一側的面这两个面中的另一个面上也形成与所述第一棱形凸起同样的第二棱形凸起,所述第一棱形凸起至少在所述侧面的附近,在所述点光源的光轴上凸起高度为最小,从所述点光源的光轴向着沿所述侧面平行的方向离开越远凸起高度逐渐增高。 A light guide plate comprising: a side surface, light emitted from the point light source is incident from the side surface; and the exit surface, the light incident on the side surface of the process of propagating within the light guide plate, the incident angle of the exit plane the light emitted below the critical angle from the emission surface, characterized in that one of the face of the two faces and the exit surface opposite thereto is formed along a plurality of remote from said side toward the parallel a first side surface extending in the direction of prismatic projections provided, said first side surface of the prismatic protrusion portion closer to the side surface has a tendency, decreasing the height of the projections, the emitted light guide plate surface and the opposite surface of the other surface side of the two surfaces of the prismatic protrusion is also formed a second similar projection of the first prism, the first prism protrusions on said at least near the side of the projection on the optical axis of the point light source to a minimum height, the farther away from the optical axis of the projection height gradually increases toward the point light source in a direction parallel to said side.
12. —种导光板,包括:侧面,从棒状光源发出的光从该侧面入射;以及射出面,入射到所述侧面的光在所述导光板内传播的过程中,对射出面的入射角在临界角以下的光从射出面射出, 其特征在于,在所述射出面及与其相反一侧的面这两个面中的一个面上,沿着所述侧面平行形成多条向着远离所述侧面的方向延伸设置的第一棱形凸起,所述侧面侧的所述第一棱形凸起的部分具有越靠近所述侧面、凸起高度逐渐降低的倾向, 在所述导光板的射出面及与其相反一侧的面这两个面中的另一个面上也形成与所述第一棱形凸起同样的第二棱形凸起,所述导光板的射出面及与其相反一侧的面这两个面中的所述一个面中所述侧面的附近为平面。 12. - kind of the light guide plate, comprising: a side surface, light emitted from the rod-shaped light is incident from the side surface; and the exit surface, the light incident on the side surface of the process of propagating within the light guide plate, the incident angle of the exit plane the light emitted below the critical angle from the emission surface, characterized in that one of the face of the two faces and the exit surface opposite thereto is formed along a plurality of remote from said side toward the parallel a first side surface extending in the direction of prismatic projections provided, said first side surface of the prismatic protrusion portion closer to the side surface has a tendency, decreasing the height of the projections, the emitted light guide plate surface and the opposite surface of the other surface side of the two surfaces of the prismatic projections are also formed in the same second and the first prism protrusions, the light guide plate exit surface and the opposite side both surfaces of the one surface in the side surface near the plane.
13. —种导光板,包括:侧面,从棒状光源发出的光从该侧面入射;以及射出面,入射到所述侧面的光在所述导光板内传播的过程中,对射出面的入射角在临界角以下的光从射出面射出, 其特征在于,在所述射出面及与其相反一侧的面这两个面中的一个面上,沿着所述侧面平行形成多条向着远离所述侧面的方向延伸设置的第一棱形凸起,所述侧面恻的所述第一棱形凸起的部分具有越靠近所述侧面、凸起高度逐渐降低的倾向,在所述导光板的射出面及与其相反一侧的面这两个面中的另一个面上也形成与所述第一棱形凸起同样的第二棱形凸起,所述第一棱形凸起至少在所述侧面的附近,在所述棒状光源的两端部附近沿着向所述棒状光源对应端部侧的方向凸起高度逐渐增高。 13. - kind of the light guide plate, comprising: a side surface, light emitted from the rod-shaped light is incident from the side surface; and the exit surface, the light incident on the side surface of the process of propagating within the light guide plate, the incident angle of the exit plane the light emitted below the critical angle from the emission surface, characterized in that one of the face of the two faces and the exit surface opposite thereto is formed along a plurality of remote from said side toward the parallel a first side surface extending in the direction of prismatic projections provided, said first side surface of sad prism raised portion tends closer to the side surface of the projection height gradually reduced, the emitted light guide plate surface and the opposite surface of the other surface side of the two surfaces of the prismatic protrusion is also formed a second similar projection of the first prism, the first prism protrusions on said at least near the side surface in the vicinity of both ends of the rod-shaped light source is gradually increased along the direction corresponding to the height of the convex end portion side of the rod-shaped light sources.
CN 200510088209 2001-07-27 2002-07-26 Surface light source device and light guide plate CN100392495C (en)

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CN102042563A (en) * 2009-10-16 2011-05-04 海洋王照明科技股份有限公司 LED (light emitting diode) non-glare optical structure and non-glare suspended ceiling lamp utilizing same
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