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JP4397910B2 - Surface light source device and transmissive image display device - Google Patents
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JP4397910B2 - Surface light source device and transmissive image display device - Google Patents

Surface light source device and transmissive image display device Download PDF

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JP4397910B2
JP4397910B2 JP2006134677A JP2006134677A JP4397910B2 JP 4397910 B2 JP4397910 B2 JP 4397910B2 JP 2006134677 A JP2006134677 A JP 2006134677A JP 2006134677 A JP2006134677 A JP 2006134677A JP 4397910 B2 JP4397910 B2 JP 4397910B2
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diffusing plate
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昭佳 金光
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Sumitomo Chemical Co Ltd
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Description

この発明は、相互に離間して配置された複数の光源を備えると共にこれら光源の前面側に光拡散板を備えた面光源装置及び該面光源装置を用いて構成された輝度ムラのない透過型画像表示装置に関する。   The present invention includes a surface light source device that includes a plurality of light sources that are spaced apart from each other and a light diffusion plate on the front side of these light sources, and a transmission type that does not have uneven brightness and is configured using the surface light source device. The present invention relates to an image display device.

透過型画像表示装置としては、例えば透過型液晶セルの上下両面に一対の偏光板が配置された透過型の画像表示部の下面側(背面側)に面光源装置がバックライトとして配置された構成のものが公知である。前記面光源装置としては、ランプボックス内に複数の光源が配置されると共にこれら光源の前面側に光拡散板が配置された構成の面光源装置が知られている(特許文献1参照)。このような面光源装置としては、透過型画像表示部を均一に照明できるものが求められている。
特開平7−141908号公報(段落0012、図1)
As a transmissive image display device, for example, a configuration in which a surface light source device is disposed as a backlight on the lower surface side (back surface side) of a transmissive image display portion in which a pair of polarizing plates are disposed on both upper and lower surfaces of a transmissive liquid crystal cell. Are known. As the surface light source device, a surface light source device having a configuration in which a plurality of light sources are disposed in a lamp box and a light diffusion plate is disposed on the front side of these light sources is known (see Patent Document 1). As such a surface light source device, a device capable of uniformly illuminating a transmissive image display unit is required.
Japanese Unexamined Patent Publication No. 7-141908 (paragraph 0012, FIG. 1)

ところで、前記面光源装置における隣り合う光源同士の間隔は、光源の配置数を低減できて省電力化できる点で、できるだけ長く設定されるのが好ましく、また光源と光拡散板との間隔は、液晶表示装置をより薄型化できる点で、できるだけ短く設定されることが好ましい。   By the way, the distance between adjacent light sources in the surface light source device is preferably set as long as possible in that the number of light sources can be reduced and power can be saved, and the distance between the light source and the light diffusion plate is as follows. It is preferable that the liquid crystal display device is set as short as possible in view of reducing the thickness of the liquid crystal display device.

しかしながら、上記従来の面光源装置では、光源同士の間隔を長く設定したり、あるいは光源と光拡散板との間隔を短く設定すると、複数の光源からの光を光拡散板で十分に拡散させることが困難であり、このために輝度ムラが生じやすいという問題があった。   However, in the conventional surface light source device, if the distance between the light sources is set long or the distance between the light sources and the light diffusion plate is set short, the light from the plurality of light sources is sufficiently diffused by the light diffusion plate. Therefore, there is a problem that luminance unevenness is likely to occur.

この発明は、かかる技術的背景に鑑みてなされたものであって、光源の配置間隔を長くして光源の使用数を低減すると共により薄型化した構成において、輝度ムラのない均一な光を出射できる面光源装置及び輝度ムラのない高品質の表示を現出できる透過型画像表示装置を提供することを目的とする。   The present invention has been made in view of such a technical background, and in a configuration in which the number of light sources used is reduced by increasing the arrangement interval of light sources and the thickness is further reduced, uniform light without uneven brightness is emitted. It is an object of the present invention to provide a surface light source device that can be used and a transmissive image display device that can display a high-quality display without uneven brightness.

上記目的を達成するために、本発明者は、隣り合う光源同士の間隔が10mm以上の長い間隔に設定され、且つ光拡散板と光源との距離が50mm以下の短い距離に設定された構成において、輝度ムラを生じないものを開発するべく鋭意研究した結果、複数の光源から光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部を、光拡散板の光源側に又は内部に設けることによって、輝度ムラのない均一な光を面出射できることを見出すに至り、この発明を完成したものである。即ち、本発明は以下の手段を提供する。   In order to achieve the above object, the present inventor has a configuration in which the interval between adjacent light sources is set to a long interval of 10 mm or more, and the distance between the light diffusion plate and the light source is set to a short distance of 50 mm or less. As a result of earnest research to develop a device that does not cause uneven brightness, incident light incident on the light diffusion plate from a plurality of light sources can be emitted in the front side direction substantially perpendicular to the surface of the light diffusion plate. By providing the deflecting structure portion having a shape on the light source side or inside of the light diffusing plate, it has been found that uniform light without uneven brightness can be emitted from the surface, and the present invention has been completed. That is, the present invention provides the following means.

[1]ランプボックス内に複数の光源が相互に離間して配置されると共にこれら複数の光源の前面側に光拡散板が配置されてなる面光源装置であって、隣り合う光源の相互離間間隔が10mm以上に設定され、前記光拡散板と前記光源との距離が50mm以下に設定され、前記複数の光源から前記光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部が、前記光拡散板の光源側に又は内部に設けられていることを特徴とする面光源装置。   [1] A surface light source device in which a plurality of light sources are arranged apart from each other in a lamp box and a light diffusing plate is arranged on the front side of the plurality of light sources. Is set to 10 mm or more, the distance between the light diffusing plate and the light source is set to 50 mm or less, and incident light incident on the light diffusing plate from the plurality of light sources is substantially perpendicular to the surface of the light diffusing plate. A surface light source device, characterized in that a deflecting structure portion having a shape that can be emitted toward the front side of the light diffusing plate is provided on or inside the light source of the light diffusing plate.

なお、この[1]の構成には、偏向構造部が、光拡散板の光源側の表面に一体形成された構成、光拡散板の光源側の表面に重ね合わされた構成、光拡散板の光源側に該光拡散板とは離間して配置された構成、光拡散板の内部に設けられた構成のいずれも包含される。   The configuration [1] includes a configuration in which the deflection structure is integrally formed on the light source side surface of the light diffusion plate, a configuration in which the light diffusion plate is superimposed on the light source side surface, and a light source of the light diffusion plate. Both of the configuration disposed on the side of the light diffusing plate and the configuration provided inside the light diffusing plate are included.

[2]画像表示部の背面側に前項1に記載の面光源装置が配置されたことを特徴とする透過型画像表示装置。   [2] A transmissive image display device, wherein the surface light source device according to the item 1 is arranged on the back side of the image display unit.

[1]の発明では、隣り合う光源同士の間隔が10mm以上の長い間隔に設定された構成であるので省電力化できると共に、光拡散板と光源との距離が50mm以下の短い距離に設定された構成であるのでより薄型化することができる。また、複数の光源から光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部が、光拡散板の光源側に又は内部に設けられているから、光源からの入射光が光拡散板の表面に対して略垂直方向の前面側方向に導かれつつ拡散され得て、輝度ムラのない均一な光を出射させることができる。このように省電力化・薄型化された面光源装置として輝度ムラのない高品質のものが提供される。   In the invention of [1], since the interval between adjacent light sources is set to a long interval of 10 mm or more, power can be saved and the distance between the light diffusion plate and the light source is set to a short distance of 50 mm or less. Therefore, it can be made thinner. The deflecting structure having a shape capable of emitting incident light incident on the light diffusing plate from a plurality of light sources toward the front side direction substantially perpendicular to the surface of the light diffusing plate is a light source of the light diffusing plate. The incident light from the light source can be diffused while being guided in the front side direction substantially perpendicular to the surface of the light diffusing plate, and emits uniform light without uneven brightness. Can be made. As described above, a high-quality surface light source device having no luminance unevenness is provided as a surface light source device that is reduced in power consumption and reduced in thickness.

[2]の発明では、薄型・省電力であり、かつ輝度ムラのない高品質の表示を実現できる透過型画像表示装置が提供される。   In the invention of [2], a transmissive image display device that is thin and power-saving and can realize high-quality display without uneven brightness is provided.

この発明の透過型画像表示装置(10)の一実施形態に係る液晶表示装置を図1に示す。図1において、(10)は液晶表示装置、(11)は液晶セル、(12)(13)は偏光板、(1)は面光源装置である。前記液晶セル(11)の上下両側にそれぞれ偏光板(12)(13)が配置され、これら構成部材(11)(12)(13)によって透過型画像表示部が構成されている。   FIG. 1 shows a liquid crystal display device according to an embodiment of the transmissive image display device (10) of the present invention. In FIG. 1, (10) is a liquid crystal display device, (11) is a liquid crystal cell, (12) and (13) are polarizing plates, and (1) is a surface light source device. Polarizing plates (12) and (13) are respectively arranged on the upper and lower sides of the liquid crystal cell (11), and a transmissive image display unit is constituted by these constituent members (11), (12) and (13).

前記面光源装置(1)は、前記下側の偏光板(13)の下面側(背面側)に配置されている。この面光源装置(1)は、平面視矩形状で上面側(前面側)が開放された薄箱型形状のランプボックス(5)と、該ランプボックス(5)内に相互に離間して配置された複数の光源(2)と、これら複数の光源(2)の上方側(前面側)に配置された光拡散板(3)と、該光拡散板(3)の光源側に又は光拡散板(3)の内部に設けられたプリズム部(偏向構造部)(4)とを備えている。前記光拡散板(3)は、前記ランプボックス(5)に対してその開放面を塞ぐように載置されて固定されている。また、前記ランプボックス(5)の内面には光反射層が設けられている。この面光源装置(1)において、隣り合う光源(2)(2)同士の間隔(L)は10mm以上に設定され、前記光拡散板(3)と前記光源(2)との距離(d)は50mm以下に設定され、d:Lは通常1:5〜5:1である。前記隣り合う光源(2)(2)同士の間隔(L)は、通常は10mm以上100mm以下に設定される。また、前記光拡散板(3)と前記光源(2)との距離(d)は、通常は10mm以上50mm以下に設定される。   The said surface light source device (1) is arrange | positioned at the lower surface side (back side) of the said lower polarizing plate (13). The surface light source device (1) is a thin box-shaped lamp box (5) having a rectangular shape in plan view and having an open upper surface (front surface), and a lamp box (5) spaced apart from each other. A plurality of light sources (2), a light diffusing plate (3) disposed on the upper side (front side) of the plurality of light sources (2), and a light diffusion side of the light diffusing plate (3) And a prism part (deflection structure part) (4) provided inside the plate (3). The said light diffusing plate (3) is mounted and fixed with respect to the said lamp box (5) so that the open surface may be block | closed. A light reflecting layer is provided on the inner surface of the lamp box (5). In this surface light source device (1), the distance (L) between adjacent light sources (2) and (2) is set to 10 mm or more, and the distance (d) between the light diffusion plate (3) and the light source (2). Is set to 50 mm or less, and d: L is usually 1: 5 to 5: 1. The distance (L) between the adjacent light sources (2) and (2) is usually set to 10 mm or more and 100 mm or less. The distance (d) between the light diffusing plate (3) and the light source (2) is usually set to 10 mm or more and 50 mm or less.

また、前記プリズム部(4)は、図1に示すように、前記複数の光源(2)から入射する入射光(Q1)を光拡散板(3)の表面に対して略垂直方向の前面側方向(図面略上方向)(F)に向けて出射させ得る形状を備えている。 Further, as shown in FIG. 1, the prism portion (4) is configured to receive incident light (Q 1 ) incident from the plurality of light sources (2) in a direction substantially perpendicular to the surface of the light diffusion plate (3). It has a shape that can be emitted toward the side direction (substantially upward in the drawing) (F).

上記構成に係る液晶表示装置(10)では、隣り合う光源(2)(2)同士の間隔(L)が10mm以上の長い間隔に設定されているので光源の使用数を低減し得て省電力化できると共に、光拡散板(3)と光源(2)との距離(d)が50mm以下の短い距離に設定されているのでより薄型化することができる。また、複数の光源(2)から入射する入射光(Q1)を光拡散板(3)の表面に対して略垂直方向の前面側方向(F)に向けて出射させ得る形状を備えたプリズム部(偏向構造部)(4)が、光拡散板(3)の光源側に又は内部に設けられているから、光源(2)からの入射光(Q1)を光拡散板(3)の表面に対して略垂直方向の前面側方向に導きつつ拡散させることができて、輝度ムラのない均一な光を液晶セル(11)に向けて出射させることができる。このように面光源装置(1)は、省電力化・薄型化しても輝度ムラのない均一な光を液晶セル(11)に照射することができるので、これにより薄型・省電力で輝度ムラのない高品質の表示を実現できる液晶表示装置(10)を提供することが可能となる。 In the liquid crystal display device (10) according to the above configuration, since the distance (L) between the adjacent light sources (2) and (2) is set to a long distance of 10 mm or more, the number of light sources used can be reduced and power can be saved. Since the distance (d) between the light diffusion plate (3) and the light source (2) is set to a short distance of 50 mm or less, the thickness can be further reduced. Also, a prism having a shape capable of emitting incident light (Q 1 ) incident from a plurality of light sources (2) in a front side direction (F) substantially perpendicular to the surface of the light diffusion plate (3). Since the part (deflection structure part) (4) is provided on the light source side of the light diffusion plate (3) or inside, the incident light (Q 1 ) from the light source (2) is transmitted to the light diffusion plate (3). The light can be diffused while being guided in the front side direction substantially perpendicular to the surface, and uniform light without unevenness in brightness can be emitted toward the liquid crystal cell (11). As described above, the surface light source device (1) can irradiate the liquid crystal cell (11) with uniform light without luminance unevenness even if it is reduced in power consumption and thickness. It is possible to provide a liquid crystal display device (10) capable of realizing a high-quality display.

以下、前記偏向構造部(プリズム部等)(4)の具体的構成例について順に説明する。即ち、複数の光源(2)から入射する入射光(Q1)を光拡散板(3)の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状の具体例を多数挙げて順に説明する。 Hereinafter, specific configuration examples of the deflection structure section (prism section, etc.) (4) will be described in order. That is, there are many specific examples of shapes in which incident light (Q 1 ) incident from a plurality of light sources (2) can be emitted in the front side direction substantially perpendicular to the surface of the light diffusion plate (3). These will be described in order.

(第1実施形態)
図2に示す第1実施形態では、面光源装置は、相互に離間して配置された複数の光源(2)と、これら複数の光源(2)の上方側(前面側)に配置された光拡散板(3)と、該光拡散板(3)の光源(2)側の表面に一体成形された多数個のプリズムからなるプリズム部(4)とを備えている。前記プリズムの断面形状は二等辺三角形形状であり、該二等辺三角形の底辺が光拡散板(3)の光源側の表面に連接されている。
(First embodiment)
In the first embodiment shown in FIG. 2, the surface light source device includes a plurality of light sources (2) that are spaced apart from each other, and light that is disposed on the upper side (front side) of the plurality of light sources (2). A diffusing plate (3) and a prism portion (4) comprising a large number of prisms integrally formed on the light source (2) side surface of the light diffusing plate (3) are provided. The cross-sectional shape of the prism is an isosceles triangle, and the base of the isosceles triangle is connected to the light source side surface of the light diffusion plate (3).

隣り合うプリズム同士の間隔(a)が0であるとき(a=0のとき)は、次式(1)を満足するように構成されるのが好ましい。   When the interval (a) between adjacent prisms is 0 (when a = 0), it is preferable that the following formula (1) is satisfied.

Figure 0004397910
Figure 0004397910

一方、隣り合うプリズム同士の間隔(a)が存在するとき(a>0のとき)は、次式(2)を満足するように構成されるのが好ましい。なお、隣り合うプリズム同士の間隔aは、通常、1μm≦a< L(隣り合う光源の間隔)の範囲に設定される。   On the other hand, when there is an interval (a) between adjacent prisms (when a> 0), it is preferable that the following equation (2) is satisfied. The interval “a” between adjacent prisms is normally set in a range of 1 μm ≦ a <L (interval between adjacent light sources).

Figure 0004397910
Figure 0004397910

(第2実施形態)
図3に示す第2実施形態では、面光源装置は、相互に離間して配置された複数の光源(2)と、これら複数の光源(2)の上方側(前面側)に配置された光拡散板(3)と、該光拡散板(3)の光源(2)側の表面に一体成形された多数個のプリズムからなるプリズム部(4)とを備えている。前記プリズムの断面形状は台形形状であり、該台形の下底(長い方の底辺)が光拡散板(3)の光源側の表面に連接されている。
(Second Embodiment)
In the second embodiment shown in FIG. 3, the surface light source device includes a plurality of light sources (2) that are spaced apart from each other, and light that is disposed on the upper side (front side) of the plurality of light sources (2). A diffusing plate (3) and a prism portion (4) comprising a large number of prisms integrally formed on the light source (2) side surface of the light diffusing plate (3) are provided. The cross-sectional shape of the prism is trapezoidal, and the lower base (longer base) of the trapezoid is connected to the light source side surface of the light diffusion plate (3).

この第2実施形態では、隣り合うプリズム同士の間隔(a)が0であるとき及び隣り合うプリズム同士の間隔(a)が存在するとき(a>0のとき)のいずれの場合でも、次式(3)及び次式(4)を満足するように構成されるのが好ましい。   In the second embodiment, the following formula is used when the interval (a) between adjacent prisms is 0 and when the interval (a) between adjacent prisms exists (when a> 0): It is preferable to be configured to satisfy (3) and the following formula (4).

Figure 0004397910
Figure 0004397910

Figure 0004397910
Figure 0004397910

(第3実施形態)
図4に示す第3実施形態では、面光源装置は、相互に離間して配置された複数の光源(2)と、これら複数の光源(2)の上方側(前面側)に配置された光拡散板(3)と、該光拡散板(3)の光源(2)側の表面に一体成形された多数個のプリズムからなるプリズム部(4)とを備えている。前記プリズムの断面形状は二等辺三角形形状であり、該二等辺三角形の底辺が光拡散板(3)の光源側の表面に連接されている。隣り合う二等辺三角形状のプリズムは、互いに頂角(α)が相違するように構成されている。即ち、頂角(α)が、光源(2)からの水平距離L1に応じて次式(5)を満足するように変化する。本構成では、全てのプリズムの高さ(厚さ)(h)は同一に設定されている。また、前記光源(2)は、最大頂角を有するプリズムの垂直下方位置に配置されている。
(Third embodiment)
In the third embodiment shown in FIG. 4, the surface light source device includes a plurality of light sources (2) that are spaced apart from each other, and light that is disposed on the upper side (front side) of the plurality of light sources (2). A diffusing plate (3) and a prism portion (4) comprising a large number of prisms integrally formed on the light source (2) side surface of the light diffusing plate (3) are provided. The cross-sectional shape of the prism is an isosceles triangle, and the base of the isosceles triangle is connected to the light source side surface of the light diffusion plate (3). The adjacent isosceles triangular prisms are configured such that the apex angles (α) are different from each other. That is, the apex angle (α) changes so as to satisfy the following expression (5) according to the horizontal distance L 1 from the light source (2). In this configuration, the height (thickness) (h) of all the prisms is set to be the same. Further, the light source (2) is disposed at a vertically lower position of the prism having the maximum apex angle.

Figure 0004397910
Figure 0004397910

(第4実施形態)
図5に示す第4実施形態では、面光源装置は、相互に離間して配置された複数の光源(2)と、これら複数の光源(2)の上方側(前面側)に配置された光拡散板(3)と、該光拡散板(3)の光源(2)側の表面に一体成形された多数個のプリズムからなるプリズム部(4)とを備えている。前記プリズムの断面形状は二等辺三角形形状であり、該二等辺三角形の底辺が光拡散板(3)の光源側の表面に連接されている。隣り合う二等辺三角形状のプリズムは、互いに頂角(α)が相違するように構成されている。即ち、頂角(α)が、光源(2)からの水平距離L2に応じて次式(6)を満足するように変化する。例えば、光源の間隔Lが30mm、光源と光拡散板の距離dが15mmである場合、図11に示すような関係が成立するように構成するのが良い。なお、本構成では、全てのプリズムの底辺の長さ(p)が同一になるように構成されている。また、前記光源(2)は、最大頂角を有するプリズム(高さが最小のプリズム)の垂直下方位置に配置されている。
(Fourth embodiment)
In the fourth embodiment shown in FIG. 5, the surface light source device includes a plurality of light sources (2) that are spaced apart from each other, and light that is disposed on the upper side (front side) of the plurality of light sources (2). A diffusing plate (3) and a prism portion (4) comprising a large number of prisms integrally formed on the light source (2) side surface of the light diffusing plate (3) are provided. The cross-sectional shape of the prism is an isosceles triangle, and the base of the isosceles triangle is connected to the light source side surface of the light diffusion plate (3). The adjacent isosceles triangular prisms are configured such that the apex angles (α) are different from each other. That is, the apex angle (α) changes so as to satisfy the following expression (6) according to the horizontal distance L 2 from the light source (2). For example, when the distance L between the light sources is 30 mm and the distance d between the light source and the light diffusion plate is 15 mm, it is preferable that the relationship shown in FIG. 11 is established. In this configuration, the lengths (p) of the bottom sides of all the prisms are the same. Further, the light source (2) is disposed at a position vertically below a prism having a maximum apex angle (a prism having a minimum height).

Figure 0004397910
Figure 0004397910

(第5実施形態)
図6に示す第5実施形態では、面光源装置は、相互に離間して配置された複数の光源(2)と、これら複数の光源(2)の上方側(前面側)に配置された光拡散板(3)と、該光拡散板(3)の光源(2)側の表面に一体成形された多数個のプリズムからなるプリズム部(4)とを備えている。前記プリズムの断面形状はフレネルレンズ形状であり、該フレネルレンズ形状の円弧面の曲率半径Rが次式(7)を満足するように構成されるのが好ましい。前記光源(2)は、最長円弧を有するプリズムの垂直下方位置に配置されている。なお、溝深さ(h)は、光源(2)と光拡散板(3)の距離(d)の5%以下に設定されるのが好ましい。
(Fifth embodiment)
In the fifth embodiment shown in FIG. 6, the surface light source device includes a plurality of light sources (2) that are spaced apart from each other, and light that is disposed on the upper side (front side) of the plurality of light sources (2). A diffusing plate (3) and a prism portion (4) comprising a large number of prisms integrally formed on the light source (2) side surface of the light diffusing plate (3) are provided. The cross-sectional shape of the prism is a Fresnel lens shape, and it is preferable that the curvature radius R of the arc surface of the Fresnel lens shape satisfies the following expression (7). The light source (2) is arranged vertically below the prism having the longest arc. The groove depth (h) is preferably set to 5% or less of the distance (d) between the light source (2) and the light diffusion plate (3).

Figure 0004397910
Figure 0004397910

(第6実施形態)
図7に示す第6実施形態では、面光源装置は、相互に離間して配置された複数の光源(2)と、これら複数の光源(2)の上方側(前面側)に配置された光拡散板(3)と、該光拡散板(3)の光源(2)側の表面に一体成形された多数個のプリズムからなるプリズム部(4)とを備えている。前記プリズムの断面形状は二等辺三角形形状であり、該二等辺三角形の底辺が光拡散板(3)の光源側の表面に連接されている。本実施形態では、プリズム部(4)は、前記光拡散板(3)の光源(2)側の表面に対して部分的に形成されている。即ち、複数個のプリズムが連続的に形成されたプリズム部(4A)と、プリズムが形成されていない平滑面部(4B)とが交互配置されている(図7参照)。
(Sixth embodiment)
In the sixth embodiment shown in FIG. 7, the surface light source device includes a plurality of light sources (2) that are spaced apart from each other, and light that is disposed on the upper side (front side) of the plurality of light sources (2). A diffusing plate (3) and a prism portion (4) comprising a large number of prisms integrally formed on the light source (2) side surface of the light diffusing plate (3) are provided. The cross-sectional shape of the prism is an isosceles triangle, and the base of the isosceles triangle is connected to the light source side surface of the light diffusion plate (3). In this embodiment, the prism part (4) is partially formed with respect to the light source (2) side surface of the light diffusing plate (3). That is, the prism portion (4A) in which a plurality of prisms are continuously formed and the smooth surface portion (4B) in which no prism is formed are alternately arranged (see FIG. 7).

隣り合う2つの光源(2)(2)の二等分中間位置から両光源に向けてd/4づつ合計d/2の幅にわたって、複数個のプリズムが連続的に形成されたプリズム部(4A)が形成されている場合(b=d/2)には、プリズムの頂角(α)が次式(8)を満足するように構成されるのが好ましい。   A prism section (4A) in which a plurality of prisms are continuously formed over a total width of d / 2 from the half-divided intermediate position of two adjacent light sources (2) and (2) toward both light sources by d / 4. ) Is formed (b = d / 2), the prism apex angle (α) is preferably configured to satisfy the following formula (8).

Figure 0004397910
Figure 0004397910

また、隣り合う2つの光源(2)(2)の二等分中間位置から両光源に向けてd/3づつ合計2d/3の幅にわたって、複数個のプリズムが連続的に形成されたプリズム部(4A)が形成されている場合(b=2d/3)には、プリズムの頂角(α)が次式(9)を満足するように構成されるのが好ましい。   Also, a prism portion in which a plurality of prisms are continuously formed over a width of 2d / 3 in total from d / 2 intermediate positions of two adjacent light sources (2) and (2) toward both light sources by d / 3. When (4A) is formed (b = 2d / 3), it is preferable that the prism has an apex angle (α) that satisfies the following expression (9).

Figure 0004397910
Figure 0004397910

この第6実施形態は、二等辺三角形等の単純な形状のプリズム部を設けるだけで良いから、グラデーションタイプの第3〜5実施形態と比較すると、設計が単純化されて製作が容易であるという利点がある。この第6実施形態では、光拡散板(3)に対して光源から遠い位置で入射する光を前面側の垂直方向に屈折させれば良いので、光源(2)の直上位置にはプリズム部を設けない一方、隣り合う光源(2)(2)間の中間位置を中心にして所定幅のプリズム部(4A)を設けている。またプリズム部(4A)を設ける範囲(幅)(b)は、光拡散板(3)の拡散能とのバランスを考慮して決定するのが良い。   In the sixth embodiment, since it is only necessary to provide a prism portion having a simple shape such as an isosceles triangle, the design is simplified and the manufacture is easy as compared with the third to fifth embodiments of the gradation type. There are advantages. In the sixth embodiment, since light incident on the light diffusing plate (3) at a position far from the light source may be refracted in the vertical direction on the front surface side, a prism portion is provided at a position directly above the light source (2). On the other hand, a prism portion (4A) having a predetermined width is provided centering on an intermediate position between adjacent light sources (2) and (2). Further, the range (width) (b) in which the prism portion (4A) is provided is preferably determined in consideration of the balance with the diffusing ability of the light diffusion plate (3).

(第7実施形態)
図8に示す第7実施形態では、面光源装置は、相互に離間して配置された複数の光源(2)と、これら複数の光源(2)の上方側(前面側)に配置された光拡散板(3)と、該光拡散板(3)の内部に二等辺三角形形状の中空部(8)が設けられることで形成された偏向構造部(4)とを備えている。前記中空部(8)の二等辺三角形の底辺が光拡散板(3)の非光源側(前面側)になるように、即ち図8においてp>W>0になるように配置されている。この第7実施形態では、次式(10)を満足するように構成されるのが好ましい。
(Seventh embodiment)
In the seventh embodiment shown in FIG. 8, the surface light source device includes a plurality of light sources (2) that are spaced apart from each other, and light that is disposed on the upper side (front side) of the plurality of light sources (2). A diffusing plate (3) and a deflecting structure portion (4) formed by providing an isosceles triangular hollow portion (8) inside the light diffusing plate (3). The bottom of the isosceles triangle of the hollow portion (8) is arranged so as to be on the non-light source side (front side) of the light diffusion plate (3), that is, p>W> 0 in FIG. In the seventh embodiment, it is preferable that the following expression (10) is satisfied.

Figure 0004397910
Figure 0004397910

(第8実施形態)
図9に示す第8実施形態では、面光源装置は、相互に離間して配置された複数の光源(2)と、これら複数の光源(2)の上方側(前面側)に配置された光拡散板(3)と、該光拡散板(3)の内部に二等辺三角形形状の中空部(8)が設けられることで形成された偏向構造部(4)とを備えている。前記中空部(8)の二等辺三角形の底辺が光拡散板(3)の光源側(背面側)になるように配置されている(即ち図9においてp>W>0になるように配置されている)。この第8実施形態では、次式(11)を満足するように構成されるのが好ましい。
(Eighth embodiment)
In the eighth embodiment shown in FIG. 9, the surface light source device includes a plurality of light sources (2) that are spaced apart from each other, and light that is disposed on the upper side (front side) of the plurality of light sources (2). A diffusing plate (3) and a deflecting structure portion (4) formed by providing an isosceles triangular hollow portion (8) inside the light diffusing plate (3). The base of the isosceles triangle of the hollow portion (8) is arranged so as to be on the light source side (back side) of the light diffusion plate (3) (that is, p>W> 0 in FIG. 9). ing). In the eighth embodiment, it is preferable that the following expression (11) is satisfied.

Figure 0004397910
Figure 0004397910

(第9実施形態)
図10に示す第9実施形態では、面光源装置は、相互に離間して配置された複数の光源(2)と、これら複数の光源(2)の上方側(前面側)に配置された光拡散板(3)と、該光拡散板(3)の内部に台形形状の中空部(8)が設けられることで形成された偏向構造部(4)とを備えている。前記中空部(8)の台形形状の長い方の底辺が光拡散板(3)の光源側(背面側)になるように配置されている。この第9実施形態では、次式(12)及び次式(13)を満足するように構成されるのが好ましい。
(Ninth embodiment)
In the ninth embodiment shown in FIG. 10, the surface light source device includes a plurality of light sources (2) that are spaced apart from each other, and light that is disposed on the upper side (front side) of the plurality of light sources (2). A diffusing plate (3) and a deflecting structure portion (4) formed by providing a trapezoidal hollow portion (8) inside the light diffusing plate (3) are provided. The long base of the trapezoidal shape of the hollow part (8) is arranged so as to be on the light source side (back side) of the light diffusion plate (3). In the ninth embodiment, it is preferable that the following expressions (12) and (13) are satisfied.

Figure 0004397910
Figure 0004397910

Figure 0004397910
Figure 0004397910

なお、前記第1〜6実施形態では、プリズム部(4)は、光拡散板(3)の光源側の表面に一体に形成された構成が採用されているが、特にこのような形態に限定されるものではなく、例えば、光拡散板(3)の光源側の表面にプリズム部(4)が非接合で重ね合わされた構成を採用しても良いし、或いは光拡散板(3)の光源側に該光拡散板とは離間して配置された構成等を採用しても良い。また、プリズム部(4)を光拡散板(3)に一体に形成するには、押出による一体成形法、プレス法、切削法等が用いられる。   In the first to sixth embodiments, the prism portion (4) is integrally formed on the light source side surface of the light diffusing plate (3), but is particularly limited to such a form. For example, a configuration in which the prism portion (4) is superposed in a non-bonded manner on the light source side surface of the light diffusing plate (3), or the light source of the light diffusing plate (3) may be adopted. A configuration in which the light diffusion plate is spaced apart from the light diffusion plate may be employed. Further, in order to form the prism portion (4) integrally with the light diffusion plate (3), an integral molding method by pressing, a pressing method, a cutting method, or the like is used.

また、頂角α(プリズム部の三角形状の頂角)、角度θは、前記各式より導き出される値に対して±5°の範囲まで許容されるが、特に好ましい許容範囲は前記各式より導き出される値に対して±3°の範囲である。   In addition, the apex angle α (triangular apex angle of the prism portion) and the angle θ are allowed up to a range of ± 5 ° with respect to the values derived from the above formulas. The range is ± 3 ° with respect to the derived value.

前記グラデーションタイプの第3〜5実施形態および部分的プリズムタイプの第6実施形態では、光源(2)は、所定位置に精度高く配置する必要があり、その分製作に時間がかかるが、前記第1実施形態と前記第2実施形態では、プリズムを全面に均一に形成せしめた構成であるから、光源(2)の水平方向における配置位置の制限は特になく、その分製作が容易化される。また、第7〜9実施形態においても、光源(2)の水平方向における配置位置は特に制限されないから、製作が容易である。   In the third to fifth embodiments of the gradation type and the sixth embodiment of the partial prism type, the light source (2) needs to be placed at a predetermined position with high accuracy, and it takes time to manufacture. In the first embodiment and the second embodiment, since the prisms are uniformly formed on the entire surface, the arrangement position of the light source (2) in the horizontal direction is not particularly limited, and the manufacture is facilitated accordingly. In addition, in the seventh to ninth embodiments, the arrangement position in the horizontal direction of the light source (2) is not particularly limited, so that the production is easy.

この発明において、前記光拡散板(3)としては、光拡散機能を有する板であれば特に限定されずどのようなものでも使用できる。例えば、アクリル系樹脂に、光拡散粒子であるポリスチレン粒子、シリコーン粒子等の樹脂粒子、炭酸カルシウム粒子、硫酸バリウム粒子、酸化チタン粒子、アルミナ粒子等の無機粒子等を含有せしめた組成物を成形してなる光拡散板、アクリル系樹脂に屈折率異方性を有する粒子を配向含有せしめてなる光拡散板等が挙げられる。また、微粒子を含まない材料を用いた場合でも、表面をマット状に荒らすことで、光拡散機能を付与せしめても良い。   In the present invention, the light diffusing plate (3) is not particularly limited as long as it is a plate having a light diffusing function, and any one can be used. For example, a composition in which acrylic resin is mixed with resin particles such as polystyrene particles and silicone particles as light diffusing particles, inorganic particles such as calcium carbonate particles, barium sulfate particles, titanium oxide particles, and alumina particles is molded. And a light diffusing plate obtained by orienting particles having refractive index anisotropy into an acrylic resin. Even when a material that does not contain fine particles is used, a light diffusing function may be imparted by roughening the surface in a mat shape.

また、前記光拡散板(3)における光拡散機能部(光拡散粒子含有部等)は、光拡散板(3)の光源側の表面の近傍位置にあっても良いし、或いは光拡散板(3)の光源側とは反対側の表面の近傍位置(前面側の表面の近傍位置)にあっても良いし、或いは光拡散板(3)の全体にわたっていても良い。   Further, the light diffusing function part (light diffusing particle-containing part or the like) in the light diffusing plate (3) may be in the vicinity of the light source side surface of the light diffusing plate (3), or the light diffusing plate ( It may be in the vicinity of the surface on the opposite side to the light source side in 3) (position in the vicinity of the surface on the front surface side), or may extend over the entire light diffusion plate (3).

また、前記光源(2)としては、特に限定されないが、例えば蛍光管、ハロゲンランプ、タングステンランプ、発光ダイオード等が挙げられる。   Further, the light source (2) is not particularly limited, and examples thereof include a fluorescent tube, a halogen lamp, a tungsten lamp, and a light emitting diode.

この発明に係る面光源装置(1)、透過型画像表示装置(10)は、上記実施形態のものに特に限定されるものではなく、請求の範囲内であれば、その精神を逸脱するものでない限りいかなる設計的変更をも許容するものである。   The surface light source device (1) and the transmissive image display device (10) according to the present invention are not particularly limited to those of the above embodiment, and do not depart from the spirit as long as they are within the scope of the claims. Any design changes are allowed as far as possible.

この発明に係る透過型画像表示装置の一実施形態を示す模式的側面図である。1 is a schematic side view showing an embodiment of a transmissive image display device according to the present invention. この発明に係る面光源装置の第1実施形態を示す模式図である。It is a schematic diagram which shows 1st Embodiment of the surface light source device which concerns on this invention. この発明に係る面光源装置の第2実施形態を示す模式図である。It is a schematic diagram which shows 2nd Embodiment of the surface light source device which concerns on this invention. この発明に係る面光源装置の第3実施形態を示す模式図である。It is a schematic diagram which shows 3rd Embodiment of the surface light source device which concerns on this invention. この発明に係る面光源装置の第4実施形態を示す模式図である。It is a schematic diagram which shows 4th Embodiment of the surface light source device which concerns on this invention. この発明に係る面光源装置の第5実施形態を示す模式図である。It is a schematic diagram which shows 5th Embodiment of the surface light source device which concerns on this invention. この発明に係る面光源装置の第6実施形態を示す模式図である。It is a schematic diagram which shows 6th Embodiment of the surface light source device which concerns on this invention. この発明に係る面光源装置の第7実施形態を示す模式図である。It is a schematic diagram which shows 7th Embodiment of the surface light source device which concerns on this invention. この発明に係る面光源装置の第8実施形態を示す模式図である。It is a schematic diagram which shows 8th Embodiment of the surface light source device which concerns on this invention. この発明に係る面光源装置の第9実施形態を示す模式図である。It is a schematic diagram which shows 9th Embodiment of the surface light source device which concerns on this invention. 第4実施形態における光源からの水平距離L2に対するプリズム部の頂角αの設定の一例を示すグラフである。The fourth is a graph showing an example of the setting of the apex angle α of the prism portion with respect to the horizontal distance L 2 from the light source in the embodiment.

符号の説明Explanation of symbols

1…面光源装置
2…光源
3…光拡散板
4…プリズム部又は偏向構造部
5…ランプボックス
10…液晶表示装置(透過型画像表示装置)
11…液晶セル
L…光源の離間間隔
d…光源と光拡散板との距離
DESCRIPTION OF SYMBOLS 1 ... Surface light source device 2 ... Light source 3 ... Light diffusing plate 4 ... Prism part or deflection | deviation structure part 5 ... Lamp box 10 ... Liquid crystal display device (transmission type image display device)
11 ... Liquid crystal cell L ... Spacing distance of light source d ... Distance between light source and light diffusion plate

Claims (12)

ランプボックス内に複数の光源が相互に離間して配置されると共にこれら複数の光源の前面側に光拡散板が配置されてなり、
隣り合う光源の相互離間間隔が10mm以上に設定され、前記光拡散板と前記光源との距離が50mm以下に設定され、
前記複数の光源から前記光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部が、前記光拡散板の光源側に設けられている面光源装置であって、
前記偏向構造部は、前記光拡散板の光源側の表面に一体成形された多数個のプリズムからなるプリズム部であり、前記プリズムの断面形状は二等辺三角形形状であり、該二等辺三角形の底辺が前記光拡散板の光源側の表面に連接され、
隣り合うプリズム同士の間隔が0であり、
前記プリズム部の三角形状の頂角は、次式(1)より導き出されるαに対して、α±5°の範囲であることを特徴とする面光源装置。
Figure 0004397910
A plurality of light sources are arranged apart from each other in the lamp box and a light diffusion plate is arranged on the front side of the plurality of light sources,
The spacing between adjacent light sources is set to 10 mm or more, the distance between the light diffusion plate and the light source is set to 50 mm or less,
A deflection structure having a shape capable of emitting incident light incident on the light diffusing plate from the plurality of light sources toward the front side direction substantially perpendicular to the surface of the light diffusing plate, A surface light source device provided on the light source side,
The deflection structure portion is a prism portion formed of a large number of prisms integrally formed on the light source side surface of the light diffusing plate, and the prism has a cross-sectional shape of an isosceles triangle, and the base of the isosceles triangle Is connected to the surface of the light diffusing plate on the light source side,
The interval between adjacent prisms is 0,
A surface light source device characterized in that a triangular apex angle of the prism portion is in a range of α ± 5 ° with respect to α derived from the following equation (1).
Figure 0004397910
ランプボックス内に複数の光源が相互に離間して配置されると共にこれら複数の光源の前面側に光拡散板が配置されてなり、
隣り合う光源の相互離間間隔が10mm以上に設定され、前記光拡散板と前記光源との距離が50mm以下に設定され、
前記複数の光源から前記光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部が、前記光拡散板の光源側に設けられている面光源装置であって、
前記偏向構造部は、前記光拡散板の光源側の表面に一体成形された多数個のプリズムからなるプリズム部であり、前記プリズムの断面形状は二等辺三角形形状であり、該二等辺三角形の底辺が前記光拡散板の光源側の表面に連接され、
隣り合うプリズム同士の間隔を「a」とし、隣り合う光源の間隔を「L」としたとき、1μm≦a<Lであり、
前記プリズム部の三角形状の頂角は、次式(2)より導き出されるαに対して、α±5°の範囲であることを特徴とする面光源装置。
Figure 0004397910
A plurality of light sources are arranged apart from each other in the lamp box and a light diffusion plate is arranged on the front side of the plurality of light sources,
The spacing between adjacent light sources is set to 10 mm or more, the distance between the light diffusion plate and the light source is set to 50 mm or less,
A deflection structure having a shape capable of emitting incident light incident on the light diffusing plate from the plurality of light sources toward the front side direction substantially perpendicular to the surface of the light diffusing plate, A surface light source device provided on the light source side,
The deflection structure portion is a prism portion composed of a plurality of prisms integrally formed on the light source side surface of the light diffusing plate, and a cross-sectional shape of the prism is an isosceles triangle, and a base of the isosceles triangle Is connected to the surface of the light diffusing plate on the light source side,
When the interval between adjacent prisms is “a” and the interval between adjacent light sources is “L”, 1 μm ≦ a <L,
A surface light source device, wherein a triangular apex angle of the prism portion is in a range of α ± 5 ° with respect to α derived from the following equation (2).
Figure 0004397910
ランプボックス内に複数の光源が相互に離間して配置されると共にこれら複数の光源の前面側に光拡散板が配置されてなり、A plurality of light sources are arranged apart from each other in the lamp box and a light diffusion plate is arranged on the front side of the plurality of light sources,
隣り合う光源の相互離間間隔が10mm以上に設定され、前記光拡散板と前記光源との距離が50mm以下に設定され、The spacing between adjacent light sources is set to 10 mm or more, the distance between the light diffusion plate and the light source is set to 50 mm or less,
前記複数の光源から前記光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部が、前記光拡散板の光源側に設けられている面光源装置であって、A deflection structure having a shape capable of emitting incident light incident on the light diffusing plate from the plurality of light sources toward the front side direction substantially perpendicular to the surface of the light diffusing plate, A surface light source device provided on the light source side,
前記偏向構造部は、前記光拡散板の光源側の表面に一体成形された多数個のプリズムからなるプリズム部であり、前記プリズムの断面形状は二等辺三角形形状であり、該二等辺三角形の底辺が前記光拡散板の光源側の表面に連接され、The deflection structure portion is a prism portion composed of a plurality of prisms integrally formed on the light source side surface of the light diffusing plate, and a cross-sectional shape of the prism is an isosceles triangle, and a base of the isosceles triangle Is connected to the surface of the light diffusing plate on the light source side,
隣り合う二等辺三角形状のプリズムは、互いに頂角が相違するように構成され、The adjacent isosceles triangular prisms are configured to have different apex angles,
前記プリズムの三角形状の頂角は、次式(5)より導き出されるαに対してα±5°の範囲であり、The triangular apex angle of the prism is in the range of α ± 5 ° with respect to α derived from the following equation (5):
全てのプリズムの高さは同一に設定され、All prisms have the same height,
前記光源は、最大頂角を有するプリズムの垂直下方位置に配置されていることを特徴とする面光源装置。The surface light source device, wherein the light source is arranged at a vertically lower position of a prism having a maximum apex angle.
Figure 0004397910
Figure 0004397910
ランプボックス内に複数の光源が相互に離間して配置されると共にこれら複数の光源の前面側に光拡散板が配置されてなり、A plurality of light sources are arranged apart from each other in the lamp box and a light diffusion plate is arranged on the front side of the plurality of light sources,
隣り合う光源の相互離間間隔が10mm以上に設定され、前記光拡散板と前記光源との距離が50mm以下に設定され、The spacing between adjacent light sources is set to 10 mm or more, the distance between the light diffusion plate and the light source is set to 50 mm or less,
前記複数の光源から前記光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部が、前記光拡散板の光源側に設けられている面光源装置であって、A deflection structure having a shape capable of emitting incident light incident on the light diffusing plate from the plurality of light sources toward the front side direction substantially perpendicular to the surface of the light diffusing plate, A surface light source device provided on the light source side,
前記偏向構造部は、前記光拡散板の光源側の表面に一体成形された多数個のプリズムからなるプリズム部であり、前記プリズムの断面形状は二等辺三角形形状であり、該二等辺三角形の底辺が前記光拡散板の光源側の表面に連接され、The deflection structure portion is a prism portion composed of a plurality of prisms integrally formed on the light source side surface of the light diffusing plate, and a cross-sectional shape of the prism is an isosceles triangle, and a base of the isosceles triangle Is connected to the surface of the light diffusing plate on the light source side,
隣り合う二等辺三角形状のプリズムは、互いに頂角が相違するように構成され、The adjacent isosceles triangular prisms are configured to have different apex angles,
前記プリズムの三角形状の頂角は、次式(6)より導き出されるαに対してα±5°の範囲であり、The triangular apex angle of the prism is in the range of α ± 5 ° with respect to α derived from the following equation (6):
全てのプリズムの底辺の長さが同一であり、All prisms have the same base length,
前記光源は、最大頂角を有するプリズムの垂直下方位置に配置されていることを特徴とする面光源装置。The surface light source device, wherein the light source is arranged at a vertically lower position of a prism having a maximum apex angle.
Figure 0004397910
Figure 0004397910
ランプボックス内に複数の光源が相互に離間して配置されると共にこれら複数の光源の前面側に光拡散板が配置されてなり、A plurality of light sources are arranged apart from each other in the lamp box and a light diffusion plate is arranged on the front side of the plurality of light sources,
隣り合う光源の相互離間間隔が10mm以上に設定され、前記光拡散板と前記光源との距離が50mm以下に設定され、The spacing between adjacent light sources is set to 10 mm or more, the distance between the light diffusion plate and the light source is set to 50 mm or less,
前記複数の光源から前記光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部が、前記光拡散板の光源側に設けられている面光源装置であって、A deflection structure having a shape capable of emitting incident light incident on the light diffusing plate from the plurality of light sources toward the front side direction substantially perpendicular to the surface of the light diffusing plate, A surface light source device provided on the light source side,
前記偏向構造部は、前記光拡散板の光源側の表面に一体成形された多数個のプリズムからなるプリズム部であり、前記プリズムの断面形状はフレネルレンズ形状であり、該フレネルレンズ形状の円弧面の曲率半径Rが次式(7)を満足するように構成され、The deflection structure portion is a prism portion formed of a large number of prisms integrally formed on a light source side surface of the light diffusion plate, and the cross-sectional shape of the prism is a Fresnel lens shape, and the arc surface of the Fresnel lens shape Is configured to satisfy the following equation (7),
前記プリズムの溝深さは、光源と光拡散板の距離の5%以下に設定され、The groove depth of the prism is set to 5% or less of the distance between the light source and the light diffusion plate,
前記光源は、最長円弧を有するプリズムの垂直下方位置に配置されていることを特徴とする面光源装置。The surface light source device, wherein the light source is disposed at a vertically lower position of a prism having a longest arc.
Figure 0004397910
Figure 0004397910
ランプボックス内に複数の光源が相互に離間して配置されると共にこれら複数の光源の前面側に光拡散板が配置されてなり、A plurality of light sources are arranged apart from each other in the lamp box and a light diffusion plate is arranged on the front side of the plurality of light sources,
隣り合う光源の相互離間間隔が10mm以上に設定され、前記光拡散板と前記光源との距離が50mm以下に設定され、The spacing between adjacent light sources is set to 10 mm or more, the distance between the light diffusion plate and the light source is set to 50 mm or less,
前記複数の光源から前記光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部が、前記光拡散板の光源側に設けられている面光源装置であって、A deflection structure having a shape capable of emitting incident light incident on the light diffusing plate from the plurality of light sources toward the front side direction substantially perpendicular to the surface of the light diffusing plate, A surface light source device provided on the light source side,
前記偏向構造部は、前記光拡散板の光源側の表面に一体成形された多数個のプリズムからなるプリズム部であり、前記プリズムの断面形状は二等辺三角形形状であり、該二等辺三角形の底辺が前記光拡散板の光源側の表面に連接され、The deflection structure portion is a prism portion composed of a plurality of prisms integrally formed on the light source side surface of the light diffusing plate, and a cross-sectional shape of the prism is an isosceles triangle, and a base of the isosceles triangle Is connected to the surface of the light diffusing plate on the light source side,
前記光拡散板の光源側の表面に対して複数個のプリズムが連続的に形成されたプリズム部と、前記光拡散板の光源側の表面に対してプリズムが形成されていない平滑面部とが交互配置され、The prism portion in which a plurality of prisms are continuously formed on the light source side surface of the light diffusion plate and the smooth surface portion on which the prism is not formed on the light source side surface of the light diffusion plate are alternately arranged. Arranged,
前記光源と前記光拡散板の距離を「d」としたとき、前記複数個のプリズムが連続的に形成されたプリズム部は、隣り合う2つの光源の二等分中間位置から両光源に向けてd/4づつ合計d/2の幅にわたって形成され、When the distance between the light source and the light diffusing plate is “d”, the prism portion in which the plurality of prisms are continuously formed is directed from the half-divided intermediate position of the two adjacent light sources toward both light sources. formed over a total width d / 2 by d / 4,
前記プリズムの三角形状の頂角は、次式(8)より導き出されるαに対して、α±5°の範囲であることを特徴とする面光源装置。The prismatic apex angle of the prism is in the range of α ± 5 ° with respect to α derived from the following equation (8).
Figure 0004397910
Figure 0004397910
ランプボックス内に複数の光源が相互に離間して配置されると共にこれら複数の光源の前面側に光拡散板が配置されてなり、A plurality of light sources are arranged apart from each other in the lamp box and a light diffusion plate is arranged on the front side of the plurality of light sources,
隣り合う光源の相互離間間隔が10mm以上に設定され、前記光拡散板と前記光源との距離が50mm以下に設定され、The spacing between adjacent light sources is set to 10 mm or more, the distance between the light diffusion plate and the light source is set to 50 mm or less,
前記複数の光源から前記光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部が、前記光拡散板の光源側に設けられている面光源装置であって、A deflection structure having a shape capable of emitting incident light incident on the light diffusing plate from the plurality of light sources toward the front side direction substantially perpendicular to the surface of the light diffusing plate, A surface light source device provided on the light source side,
前記偏向構造部は、前記光拡散板の光源側の表面に一体成形された多数個のプリズムからなるプリズム部であり、前記プリズムの断面形状は二等辺三角形形状であり、該二等辺三角形の底辺が前記光拡散板の光源側の表面に連接され、The deflection structure portion is a prism portion composed of a plurality of prisms integrally formed on the light source side surface of the light diffusing plate, and a cross-sectional shape of the prism is an isosceles triangle, and a base of the isosceles triangle Is connected to the surface of the light diffusing plate on the light source side,
前記光拡散板の光源側の表面に対して複数個のプリズムが連続的に形成されたプリズム部と、前記光拡散板の光源側の表面に対してプリズムが形成されていない平滑面部とが交互配置され、The prism portion in which a plurality of prisms are continuously formed on the light source side surface of the light diffusion plate and the smooth surface portion on which the prism is not formed on the light source side surface of the light diffusion plate are alternately arranged. Arranged,
前記光源と前記光拡散板の距離を「d」としたとき、前記複数個のプリズムが連続的に形成されたプリズム部は、隣り合う2つの光源の二等分中間位置から両光源に向けてd/3づつ合計2d/3の幅にわたって形成され、When the distance between the light source and the light diffusing plate is “d”, the prism portion in which the plurality of prisms are continuously formed is directed from the half-divided intermediate position of the two adjacent light sources toward both light sources. formed over a total width of 2d / 3 by d / 3,
前記プリズムの三角形状の頂角は、次式(9)より導き出されるαに対して、α±5°の範囲であることを特徴とする面光源装置。The surface light source device characterized in that the triangular apex angle of the prism is in the range of α ± 5 ° with respect to α derived from the following equation (9).
Figure 0004397910
Figure 0004397910
ランプボックス内に複数の光源が相互に離間して配置されると共にこれら複数の光源の前面側に光拡散板が配置されてなり、A plurality of light sources are arranged apart from each other in the lamp box and a light diffusion plate is arranged on the front side of the plurality of light sources,
隣り合う光源の相互離間間隔が10mm以上に設定され、前記光拡散板と前記光源との距離が50mm以下に設定され、The spacing between adjacent light sources is set to 10 mm or more, the distance between the light diffusion plate and the light source is set to 50 mm or less,
前記複数の光源から前記光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部が、前記光拡散板の内部に設けられている面光源装置であって、A deflection structure having a shape capable of emitting incident light incident on the light diffusing plate from the plurality of light sources toward the front side direction substantially perpendicular to the surface of the light diffusing plate, A surface light source device provided inside,
前記偏向構造部は、前記光拡散板の内部に二等辺三角形形状の中空部が設けられることで形成された偏向構造部であり、前記中空部の二等辺三角形の底辺が前記光拡散板の非光源側になるように配置され、The deflection structure portion is a deflection structure portion formed by providing an isosceles triangular hollow portion inside the light diffusing plate, and the base of the isosceles triangle of the hollow portion is not on the light diffusing plate. Placed on the light source side,
前記中空部の三角形状の頂角は、次式(10)より導き出されるθに対して、θ±5°の範囲であることを特徴とする面光源装置。A surface light source device characterized in that a triangular apex angle of the hollow portion is in a range of θ ± 5 ° with respect to θ derived from the following equation (10).
Figure 0004397910
Figure 0004397910
ランプボックス内に複数の光源が相互に離間して配置されると共にこれら複数の光源の前面側に光拡散板が配置されてなり、A plurality of light sources are arranged apart from each other in the lamp box and a light diffusion plate is arranged on the front side of the plurality of light sources,
隣り合う光源の相互離間間隔が10mm以上に設定され、前記光拡散板と前記光源との距離が50mm以下に設定され、The spacing between adjacent light sources is set to 10 mm or more, the distance between the light diffusion plate and the light source is set to 50 mm or less,
前記複数の光源から前記光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部が、前記光拡散板の内部に設けられている面光源装置であって、A deflection structure having a shape capable of emitting incident light incident on the light diffusing plate from the plurality of light sources toward the front side direction substantially perpendicular to the surface of the light diffusing plate, A surface light source device provided inside,
前記偏向構造部は、前記光拡散板の内部に二等辺三角形形状の中空部が設けられることで形成された偏向構造部であり、前記中空部の二等辺三角形の底辺が前記光拡散板の光源側になるように配置され、The deflection structure portion is a deflection structure portion formed by providing an isosceles triangular hollow portion inside the light diffusing plate, and the base of the isosceles triangle of the hollow portion is a light source of the light diffusing plate. Placed on the side,
前記中空部の三角形状の頂角は、次式(11)より導き出されるθに対して、θ±5°の範囲であることを特徴とする面光源装置。A surface light source device characterized in that a triangular apex angle of the hollow portion is in a range of θ ± 5 ° with respect to θ derived from the following equation (11).
Figure 0004397910
Figure 0004397910
ランプボックス内に複数の光源が相互に離間して配置されると共にこれら複数の光源の前面側に光拡散板が配置されてなり、A plurality of light sources are arranged apart from each other in the lamp box and a light diffusion plate is arranged on the front side of the plurality of light sources,
隣り合う光源の相互離間間隔が10mm以上に設定され、前記光拡散板と前記光源との距離が50mm以下に設定され、The spacing between adjacent light sources is set to 10 mm or more, the distance between the light diffusion plate and the light source is set to 50 mm or less,
前記複数の光源から前記光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部が、前記光拡散板の内部に設けられている面光源装置であって、A deflection structure having a shape capable of emitting incident light incident on the light diffusing plate from the plurality of light sources toward the front side direction substantially perpendicular to the surface of the light diffusing plate, A surface light source device provided inside,
前記偏向構造部は、前記光拡散板の内部に台形形状の中空部が設けられることで形成された偏向構造部であり、前記中空部の台形形状の長い方の底辺が前記光拡散板の光源側になるように配置され、The deflection structure portion is a deflection structure portion formed by providing a trapezoidal hollow portion inside the light diffusing plate, and the longer base of the trapezoidal shape of the hollow portion is a light source of the light diffusing plate. Placed on the side,
次式(12)より導き出されるθは、W<{tanθ−tan(θ/2)}・hを満足し、Θ derived from the following equation (12) satisfies W <{tan θ−tan (θ / 2)} · h,
前記中空部の台形形状の傾斜面がなす角度は、次式(12)より導き出されるθに対して、θ±5°の範囲であることを特徴とする面光源装置。An angle formed by the trapezoidal inclined surface of the hollow portion is in a range of θ ± 5 ° with respect to θ derived from the following equation (12).
Figure 0004397910
Figure 0004397910
ランプボックス内に複数の光源が相互に離間して配置されると共にこれら複数の光源の前面側に光拡散板が配置されてなり、A plurality of light sources are arranged apart from each other in the lamp box and a light diffusion plate is arranged on the front side of the plurality of light sources,
隣り合う光源の相互離間間隔が10mm以上に設定され、前記光拡散板と前記光源との距離が50mm以下に設定され、The spacing between adjacent light sources is set to 10 mm or more, the distance between the light diffusing plate and the light source is set to 50 mm or less,
前記複数の光源から前記光拡散板に入射する入射光を光拡散板の表面に対して略垂直方向の前面側方向に向けて出射させ得る形状を備えた偏向構造部が、前記光拡散板の内部に設けられている面光源装置であって、A deflecting structure having a shape capable of emitting incident light incident on the light diffusing plate from the plurality of light sources toward the front side direction substantially perpendicular to the surface of the light diffusing plate, A surface light source device provided inside,
前記偏向構造部は、前記光拡散板の内部に台形形状の中空部が設けられることで形成された偏向構造部であり、前記中空部の台形形状の長い方の底辺が前記光拡散板の光源側になるように配置され、The deflection structure part is a deflection structure part formed by providing a trapezoidal hollow part inside the light diffusing plate, and the long base of the trapezoidal shape of the hollow part is a light source of the light diffusing plate Placed on the side,
次式(13)より導き出されるθは、W≧{tanθ−tan(θ/2)}・hを満足し、Θ derived from the following equation (13) satisfies W ≧ {tan θ−tan (θ / 2)} · h,
前記中空部の台形形状の傾斜面がなす角度は、次式(13)より導き出されるθに対して、θ±5°の範囲であることを特徴とする面光源装置。An angle formed by the trapezoidal inclined surface of the hollow portion is in a range of θ ± 5 ° with respect to θ derived from the following equation (13).
Figure 0004397910
Figure 0004397910
画像表示部の背面側に請求項1〜11のいずれか1項に記載の面光源装置が配置されたことを特徴とする透過型画像表示装置。A transmissive image display device, wherein the surface light source device according to any one of claims 1 to 11 is arranged on a back side of an image display unit.
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