JP2019139113A

JP2019139113A - Display device

Info

Publication number: JP2019139113A
Application number: JP2018023610A
Authority: JP
Inventors: 高田　和政; Kazumasa Takada; 和政高田; 和平上水; Wahei Agemizu
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2018-02-14
Filing date: 2018-02-14
Publication date: 2019-08-22
Anticipated expiration: 2038-02-14
Also published as: JP7126132B2

Abstract

To provide a display device that can reduce occurrence of a situation where one part of a display pattern gets dark depending upon a position of a viewpoint of a user, or the one part of the display pattern gets dark due to warping or a flexure of a light guide plate.SOLUTION: A display device comprises: a light guide plate 1 that propagates light incident from an end surface 5, causes the light to be reflected by a first prism 7 provided in a reflection surface 2, and causes the light to be emitted from an emission surface 6 facing the reflection surface 2; and a light source 4 that makes the light incident upon the end surface 5 of the light guide plate 1. In the display device having a pattern 3 formed by a collective entity of a plurality of first prisms 7, an angle θr formed by a direction of a line segment connecting a center of the light source 4 to a center of the first prism 7, and a direction perpendicular to a longitudinal direction of the first prism 7 satisfies 45°/2≤θr≤45°/2, and a plurality of angles θr of each first prism 7 is dispersed within a range of the pattern 3.SELECTED DRAWING: Figure 1

Description

本発明は、例えば、電気機器等において文字や図形、絵柄等の情報を表示する表示装置に関する。 The present invention relates to a display device that displays information such as characters, figures, patterns, etc. in, for example, electrical equipment.

特許文献１などには、図１２（ａ）（ｂ）の表示装置が開示されている。 Patent Document 1 and the like disclose the display device shown in FIGS.

これは、透明な導光板１０１の反射面１０２には、第１パターン１０３の絵柄に沿って配列された複数の第１プリズム１０７と、第２パターン１０８の絵柄に沿って配列された複数の第２プリズム１１０が設けられている。第１プリズム１０７は、第１光源１０４に対して正対するように向けられた反射面１０７ａを有しており、第１光源１０４から発して入射面１０５から導光板１０１に入射した可視光を、導光板１０１の出射面１０６へ向けて反射する。第２プリズム１１０は、第２光源１０９に対して正対するように向けられた反射面１１０ａを有しており、第２光源１０９から発して入射面１０５から導光板１０１に入射した光を出射面１０６へ向けて反射する。 This is because a plurality of first prisms 107 arranged along the pattern of the first pattern 103 and a plurality of first prisms arranged along the pattern of the second pattern 108 are formed on the reflective surface 102 of the transparent light guide plate 101. Two prisms 110 are provided. The first prism 107 has a reflective surface 107 a that is directed to face the first light source 104, and visible light that is emitted from the first light source 104 and is incident on the light guide plate 101 from the incident surface 105. The light is reflected toward the exit surface 106 of the light guide plate 101. The second prism 110 has a reflecting surface 110a that is directed to face the second light source 109, and emits light emitted from the second light source 109 and incident on the light guide plate 101 from the incident surface 105. Reflected toward 106.

この表示装置では、第２光源１０９を消灯し、第１光源１０４を発光させると、第１パターン１０３の絵柄が第１プリズム１０７によって表示される。また、第１光源１０４を消灯し、第２光源１０９を発光させると、第２パターン１０８の絵柄が第２プリズム１１０によって表示される。 In this display device, when the second light source 109 is turned off and the first light source 104 is caused to emit light, the pattern of the first pattern 103 is displayed by the first prism 107. When the first light source 104 is turned off and the second light source 109 is caused to emit light, the pattern of the second pattern 108 is displayed by the second prism 110.

特開２０１６−１２２１６２号公報JP, 2006-122162, A

例えばパチンコ台に搭載して使う表示装置を想定すると、遊技者の姿勢のブレなどを考慮し、視野角を±１０°から±２０°程度確保する必要がある。 For example, assuming a display device mounted on a pachinko machine, it is necessary to secure a viewing angle of about ± 10 ° to ± 20 ° in consideration of blurring of the posture of the player.

しかしながら、図１２に示した従来の表示装置では、視野角が狭いとか、第１パターン１０３または第２パターン１０８による絵柄が部分的に見えない状態になる可能性がある。これを図１３（ａ）（ｂ）で説明する。 However, in the conventional display device shown in FIG. 12, there is a possibility that the viewing angle is narrow or the pattern by the first pattern 103 or the second pattern 108 is partially invisible. This will be described with reference to FIGS.

図１３（ａ）（ｂ）は、光源からの光が導光板内のプリズムに反射する様子を示す。 FIGS. 13A and 13B show how the light from the light source is reflected by the prism in the light guide plate.

図１３（ａ）は、遊技者の目が導光板１０１の正面位置Ｉにある場合と、遊技者の目が導光板１０１の正面位置から角度θだけずれた位置IIにある場合を示す。光源１０４からの光が第１プリズム１０７で反射して出射面１０６から出射した光は、遊技者の目が正面位置Ｉにある場合には、これを確認できる。逆に言うと、遊技者の目が正面位置Ｉにある場合には、第１プリズム１０７の反射面でもって光源１０４の像を見ることができる。その結果、明るい点として第１プリズム１０７を認識できる。一方、遊技者の目が位置IIにある場合、θが例えば１０°と大きいと、第１プリズム１０７の反射面でもって光源１０４の像を見ることができなくなる。そのため第１プリズム１０７を明るい点として認識できない。 FIG. 13A shows a case where the player's eyes are at the front position I of the light guide plate 101 and a case where the player's eyes are at a position II shifted from the front position of the light guide plate 101 by an angle θ. When the light of the light source 104 is reflected by the first prism 107 and is emitted from the emission surface 106, when the player's eyes are in the front position I, this can be confirmed. In other words, when the player's eyes are at the front position I, the image of the light source 104 can be seen by the reflecting surface of the first prism 107. As a result, the first prism 107 can be recognized as a bright spot. On the other hand, when the player's eyes are at position II, if θ is as large as 10 °, for example, the image of the light source 104 cannot be seen by the reflecting surface of the first prism 107. Therefore, the first prism 107 cannot be recognized as a bright point.

この現象を、導光板の複数のプリズムにあてはめた時の概略説明図を図１３（ｂ）に示す。 FIG. 13B shows a schematic explanatory diagram when this phenomenon is applied to a plurality of prisms of the light guide plate.

導光板１０１の中心Ｏから垂直な方向に遊技者の目が位置しているとする。中心点Ｏから距離ｌ離れたところに点Ａ，Ｂを設定し、遊技者の目と中心点Ｏを結ぶ線分と、遊技者の目と点Ａを結ぶ線分のなす角をθＡとする。遊技者の目と中心点Ｏを結ぶ線分と、遊技者の目と点Ｂとを結ぶ線分のなす角度をθＢとする。中心点Ｏ，点Ａ，Ｂの位置には、それぞれ光源に正対したプリズムが設置されているとする。θＡ，θＢが例えば１０°程度で大きい場合、中心点Ｏのプリズムは明るい点として認識されるが、点Ａ，Ｂのプリズムは明るい点として認識できない。このように遊技者の目で見る導光板１０１のプリズムの位置によっては、絵柄が明るく見えない現象が生じる。 It is assumed that the player's eyes are located in a direction perpendicular to the center O of the light guide plate 101. Points A and B are set at a distance l from the center point O, and the angle between the line segment connecting the player's eyes and the center point O and the line segment connecting the player's eyes and the point A is θA. . An angle formed by a line segment connecting the player's eyes and the center point O and a line segment connecting the player's eyes and the point B is defined as θB. It is assumed that prisms facing the light source are installed at the positions of the center point O, points A, and B, respectively. When θA and θB are large, for example, about 10 °, the prism at the center point O is recognized as a bright point, but the prisms at points A and B cannot be recognized as bright points. In this way, depending on the position of the prism of the light guide plate 101 as seen by the player's eyes, a phenomenon occurs in which the pattern does not appear bright.

図１４（ａ）のように、第１プリズム１０７の集合体で形成された第１パターン１０３の絵柄を見る場合、一例として図１４（ｂ）に示すように、第１パターン１０３の絵柄中に暗部１１０，１１１が生じてしまう。 As shown in FIG. 14B, when viewing the pattern of the first pattern 103 formed by the aggregate of the first prisms 107 as shown in FIG. 14A, as shown in FIG. Dark portions 110 and 111 are generated.

多くの導光板１０１は、透明樹脂を使った金型成形工法で作製されるが、導光板１０１の成形品に反りや撓みが生じることは少なくない。導光板１０１に反りや撓みがあると、本来は見える筈の絵柄が見えなくなる現象が生じる。これを図１５で説明する。 Many of the light guide plates 101 are manufactured by a mold forming method using a transparent resin, but warpage and bending are often caused in a molded product of the light guide plate 101. If the light guide plate 101 is warped or bent, a phenomenon in which the originally visible haze pattern becomes invisible occurs. This will be described with reference to FIG.

図１５は、撓みのある導光板１０１に、光源１０４に正対させるように第１プリズム１０７を設置し、遊技者の導光板１０１の正面位置Ｉから見る状況を示している。 FIG. 15 shows a situation in which the first prism 107 is installed on the light guide plate 101 having bending so as to face the light source 104 and viewed from the front position I of the player's light guide plate 101.

光源１０４から出射した光が導光板１０１に入光し、全反射で伝搬する。導光板１０１の撓みによって、反射ごとに進む方向が変化する。その結果、第１プリズム１０７で反射した光１１２は、導光板１０１の正面に居る遊技者の目に進んでこない。そのため、第１プリズム１０７を明るい点として認識できないことになる。これによって、図１４（ｂ）で説明したと同じように、表示絵柄が一部明るく見えないという現象が生じる。 Light emitted from the light source 104 enters the light guide plate 101 and propagates by total reflection. Due to the bending of the light guide plate 101, the direction of travel for each reflection changes. As a result, the light 112 reflected by the first prism 107 does not travel to the eyes of the player in front of the light guide plate 101. For this reason, the first prism 107 cannot be recognized as a bright spot. As a result, a phenomenon occurs in which a part of the displayed picture does not appear bright as described with reference to FIG.

本発明は、利用者の視点の位置によって表示絵柄の一部が暗くなってしまったり、導光板の反りや撓みによって表示絵柄の一部が暗くなってしまう事態の発生を低減できる表示装置を提供することを目的とする。 The present invention provides a display device capable of reducing the occurrence of a situation in which a part of a display picture becomes dark depending on the position of a user's viewpoint or a part of the display picture becomes dark due to warping or bending of a light guide plate. The purpose is to do.

本発明の表示装置は、端面から入射した光を伝搬するとともに、反射面に設けられた第１プリズムで反射させ、前記反射面と向かい合う出射面から出射させる導光板と、前記導光板の端面に光を入射させる光源とを備え、複数の前記第１プリズムの集合体によってパターンが形成された表示装置において、前記光源の中心と前記第１プリズムの中心とを結ぶ線分の方向と、前記第１プリズムの長手方向に垂直な方向との成す角度θｒが、−４５°／２ ≦ θｒ ≦４５°／２を満たして前記パターンの範囲内で複数の各前記第１プリズムの角度θｒがランダムに分散している、ことを特徴とする。 The display device of the present invention propagates light incident from the end face, reflects the light with a first prism provided on the reflecting face, and emits the light from an exit face facing the reflecting face, and the end face of the light guide plate. In a display device comprising a light source for entering light, wherein a pattern is formed by an assembly of a plurality of the first prisms, a direction of a line segment connecting the center of the light source and the center of the first prism, An angle θr formed with a direction perpendicular to the longitudinal direction of one prism satisfies −45 ° / 2 ≦ θr ≦ 45 ° / 2, and an angle θr of each of the plurality of first prisms is randomly within the range of the pattern. It is distributed.

また、前記パターンの範囲内の前記第１プリズムの総個数をｎＡ、角度θｒ＝０の前記第１プリズムの個数をｎ０とした時に、ｎ０／ｎＡ ≦７０％である、ことが好ましい。 Further, it is preferable that n0 / nA ≦ 70%, where nA is the total number of the first prisms within the pattern and n0 is the number of the first prisms having an angle θr = 0.

また、本発明の表示装置は、端面から入射した光を伝搬するとともに、反射面に設けられた第１プリズムで反射させ、前記反射面と向かい合う出射面から出射させる導光板と、前記導光板の端面に光を入射させる複数の光源とを備え、複数の前記第１プリズムの集合体によってパターンが形成された表示装置において、複数の前記光源の両端の間隔は、前記パターンの幅より小さく、複数の前記光源の両端と前記パターンの端とを結ぶ線分の交点の３点で形成される領域内の点と、前記第１プリズムの中心とを結ぶ線分の方向と、前記第１プリズムの長手方向と垂直な方向との成す角度θｒが、−４５°／２ ≦ θｒ ≦４５°／２を満たして前記パターンの範囲内で複数の各前記第１プリズムの角度θｒがランダムに分散している、ことを特徴とする。 In addition, the display device of the present invention propagates light incident from the end surface, reflects the light with a first prism provided on the reflection surface, and emits the light from an emission surface facing the reflection surface. A display device including a plurality of light sources that allow light to be incident on an end surface, wherein a pattern is formed by an assembly of the plurality of first prisms, and a distance between both ends of the plurality of light sources is smaller than a width of the pattern. The direction of the line segment connecting the point in the region formed by the three intersections of the line segment connecting both ends of the light source and the pattern end, and the center of the first prism, The angle θr formed between the longitudinal direction and the perpendicular direction satisfies −45 ° / 2 ≦ θr ≦ 45 ° / 2, and the angles θr of the plurality of first prisms are randomly dispersed within the range of the pattern. It is characterized by To do.

また、本発明の表示装置は、端面から入射した光を伝搬するとともに、反射面に設けられた前記プリズムで反射させ、前記反射面と向かい合う出射面から出射させる導光板と、前記導光板の端面に光を入射させる複数の光源とを備え、複数の前記第１プリズムの集合体によってパターンが形成された表示装置において、複数の前記光源のうち前記第１プリズムの各々に最も近い光源と前記第１プリズムの中心とを結ぶ線分の方向と、前記第１プリズムの長手方向に垂直な方向との成す角度θｒが、−４５°／２ ≦ θｒ ≦４５°／２を満たして前記パターンの範囲内で複数の各前記第１プリズムの角度θｒがランダムに分散している、ことを特徴とする。 In addition, the display device of the present invention propagates light incident from the end face, reflects the light by the prism provided on the reflection face, and emits the light from the emission face facing the reflection face, and the end face of the light guide plate A display device having a pattern formed by an assembly of a plurality of first prisms, and a light source closest to each of the first prisms among the plurality of light sources and the first light source. An angle θr formed by a direction of a line segment connecting the center of one prism and a direction perpendicular to the longitudinal direction of the first prism satisfies −45 ° / 2 ≦ θr ≦ 45 ° / 2, and the range of the pattern The angle θr of each of the plurality of first prisms is randomly dispersed.

また、本発明の表示装置は、端面から入射した光を伝搬するとともに、反射面に設けられた第１，第２プリズムで反射させ、前記反射面と向かい合う出射面から出射させる導光板と、前記導光板の端面に光を入射させる第１，第２光源とを備え、複数の前記第１プリズムの集合体によって前記第１光源からの光を反射して第１パターンが形成され、複数の前記第２プリズムの集合体によって前記第２光源からの光を反射して第２パターンが形成された表示装置において、前記第１光源と前記第１プリズムの中心とを結ぶ線分の方向と、前記第１プリズムの長手方向に垂直な方向との成す角度θｒ７が、−４５°／４ ≦ θｒ７ ≦４５°／４を満たして前記第１パターンの範囲内で複数の各前記第１プリズムの角度θｒ７がランダムに分散しており、前記第２光源と前記第２プリズムの中心とを結ぶ線分の方向と、前記第２プリズムの長手方向に垂直な方向との成す角度θｒ１０が、−４５°／４ ≦ θｒ１０ ≦４５°／４を満たして前記第２パターンの範囲内で複数の各前記第２プリズムの角度θｒ１０がランダムに分散している、ことを特徴とする。 Further, the display device of the present invention propagates the light incident from the end face, reflects the light by the first and second prisms provided on the reflection surface, and emits the light from the emission surface facing the reflection surface, First and second light sources that make light incident on the end face of the light guide plate, and a plurality of the first prisms reflect light from the first light source to form a first pattern, In a display device in which a second pattern is formed by reflecting light from the second light source by an assembly of second prisms, the direction of a line segment connecting the first light source and the center of the first prism, An angle θr7 formed with a direction perpendicular to the longitudinal direction of the first prism satisfies −45 ° / 4 ≦ θr7 ≦ 45 ° / 4, and an angle θr7 of each of the plurality of first prisms within the range of the first pattern. Are randomly distributed The angle θr10 formed by the direction of the line segment connecting the second light source and the center of the second prism and the direction perpendicular to the longitudinal direction of the second prism is −45 ° / 4 ≦ θr10 ≦ 45 ° / 4 and the angle θr10 of each of the plurality of second prisms is randomly dispersed within the range of the second pattern.

また、本発明の表示装置は、端面から入射した光を伝搬するとともに、反射面に設けられた第１，第２プリズムで反射させ、前記反射面と向かい合う出射面から出射させる導光板と、前記導光板の端面に光を入射させる複数の第１光源と、前記導光板の端面に光を入射させる複数の第２光源とを備え、複数の前記第１プリズムの集合体によって前記第１光源からの光を反射して第１パターンが形成され、複数の前記第２プリズムの集合体によって前記第２光源からの光を反射して第２パターンが形成された表示装置において、前記第１光源の両端の間隔は前記第１パターンの幅より小さく、前記第２光源の両端の間隔は前記第２パターンの幅より小さく、前記第１光源の両端と前記第１パターンの端とを結ぶ線分の交点と、前記第１光源の両端の３点で形成される領域内の点と、前記第１プリズムの中心とを結ぶ線分の方向と、前記第１プリズムの長手方向に垂直な方向との成す角度θｒ７が、−４５°／４ ≦ θｒ７ ≦４５°／４を満たして前記第１パターンの範囲内で複数の各前記第１プリズムの角度θｒ７がランダムに分散しており、前記第２光源の端と前記第２パターンの端とを結ぶ線分の交点と、前記第２光源の両端の３点で形成される領域内の点と、前記第２プリズムの中心とを結ぶ線分の方向と、前記第２プリズムの長手方向に垂直な方向との成す角度θｒ１０が、−４５°／４ ≦ θｒ１０ ≦４５°／４を満たして前記第２パターンの範囲内で複数の各前記第２プリズムの角度θｒ１０がランダムに分散している、ことを特徴とする。 Further, the display device of the present invention propagates the light incident from the end face, reflects the light by the first and second prisms provided on the reflection surface, and emits the light from the emission surface facing the reflection surface, A plurality of first light sources that allow light to enter the end face of the light guide plate; and a plurality of second light sources that allow light to enter the end face of the light guide plate. In the display device in which the first pattern is formed by reflecting the light of the first light source and the second pattern is formed by reflecting the light from the second light source by an assembly of the plurality of second prisms, The distance between both ends is smaller than the width of the first pattern, the distance between both ends of the second light source is smaller than the width of the second pattern, and a line segment connecting both ends of the first light source and the end of the first pattern Both the intersection and the first light source The angle θr7 formed by the direction of the line segment connecting the point in the region formed by the three points and the center of the first prism and the direction perpendicular to the longitudinal direction of the first prism is −45 ° / 4 ≦ θr7 ≦ 45 ° / 4 is satisfied, and the angles θr7 of the plurality of first prisms are randomly dispersed within the range of the first pattern, and the end of the second light source and the end of the second pattern The direction of the line segment connecting the intersection of the line segment, the point in the region formed by the three points at both ends of the second light source, and the center of the second prism, and the longitudinal direction of the second prism The angle θr10 formed with the direction perpendicular to the angle satisfies −45 ° / 4 ≦ θr10 ≦ 45 ° / 4, and the angles θr10 of the plurality of second prisms are randomly dispersed within the range of the second pattern. It is characterized by that.

また、本発明の表示装置は、端面から入射した光を伝搬するとともに、反射面に設けられた第１，第２プリズムで反射させ、前記反射面と向かい合う出射面から出射させる導光板と、前記導光板の端面に光を入射させる第１光源と、前記導光板の端面に光を入射させる第２光源とを備え、複数の前記第１プリズムの集合体によって前記第１光源からの光を反射して第１パターンが形成され、複数の前記第２プリズムの集合体によって前記第２光源からの光を反射して第２パターンが形成された表示装置において、複数の前記第１光源の両端の間隔は、前記第１パターンの幅より小さく、複数の前記第２光源の両端の間隔は、前記第２パターンの幅より小さく、前記第１光源の両端と前記第１パターンの端とを結ぶ線分の交点の３点で形成される領域内の点と、前記第１プリズムの中心とを結ぶ線分の方向と、前記第１プリズムの長手方向と垂直な方向との成す角度θｒ７が、−４５°／４ ≦ θｒ７ ≦４５°／４を満たして前記第１パターンの範囲内で複数の各前記第１プリズムの角度θｒ７がランダムに分散しており、前記第２光源の両端と前記第２パターンの端とを結ぶ線分の交点の３点で形成される領域内の点と、前記第２プリズムの中心とを結ぶ線分の方向と、前記第２プリズムの長手方向と垂直な方向との成す角度θｒ１０が、−４５°／４ ≦ θｒ１０ ≦４５°／４を満たして前記第２パターンの範囲内で複数の各前記第２プリズムの角度θｒ１０がランダムに分散している、ことを特徴とする。 Further, the display device of the present invention propagates the light incident from the end face, reflects the light by the first and second prisms provided on the reflection surface, and emits the light from the emission surface facing the reflection surface, A first light source for causing light to enter the end face of the light guide plate; and a second light source for causing light to enter the end face of the light guide plate, and reflecting light from the first light source by an assembly of the plurality of first prisms. In the display device in which the first pattern is formed and the second pattern is formed by reflecting the light from the second light source by an assembly of the plurality of second prisms, The interval is smaller than the width of the first pattern, the intervals between both ends of the plurality of second light sources are smaller than the width of the second pattern, and a line connecting both ends of the first light source and the ends of the first pattern. Formed by the intersection of 3 minutes An angle θr7 formed by a direction of a line segment connecting a point in the region and the center of the first prism and a direction perpendicular to the longitudinal direction of the first prism is −45 ° / 4 ≦ θr7 ≦ 45 ° / The angle θr7 of each of the plurality of first prisms is randomly distributed within the range of the first pattern that satisfies 4 and the intersection of the line segment connecting both ends of the second light source and the end of the second pattern The angle θr10 formed by the direction of the line segment connecting the point in the region formed by the three points and the center of the second prism and the direction perpendicular to the longitudinal direction of the second prism is −45 ° / 4 ≦ θr10 ≦ 45 ° / 4 is satisfied, and the angle θr10 of each of the plurality of second prisms is randomly dispersed within the range of the second pattern.

この構成によれば、光源の中心と第１プリズムの中心とを結ぶ線分の方向と、第１プリズムの長手方向に垂直な方向との成す角度θｒをランダムに分散させているので、視点の位置によって絵柄の一部が暗くなってしまう、あるいは導光板の反りや撓みによって絵柄の一部が暗くなってしまうことを低減できる。 According to this configuration, the angle θr formed by the direction of the line segment connecting the center of the light source and the center of the first prism and the direction perpendicular to the longitudinal direction of the first prism is randomly dispersed. It can be reduced that a part of the pattern becomes dark depending on the position, or a part of the pattern becomes dark due to warping or bending of the light guide plate.

本発明の実施の形態１に係る表示装置の（ａ）正面図と（ｂ）側面図および（ｃ）光源とプリズム反射面の角度の説明図(A) Front view, (b) Side view and (c) Angle of light source and prism reflection surface of display device according to Embodiment 1 of the present invention プリズムの拡大射視図Enlarged perspective view of prism 本発明の実施の形態２に係る表示装置の（ａ）正面図と（ｂ）側面図(A) Front view and (b) Side view of a display device according to Embodiment 2 of the present invention. 本発明の実施の形態３に係る表示装置の（ａ）正面図と（ｂ）側面図および（ｃ）光源とプリズム反射面の角度の説明図(A) Front view, (b) Side view and (c) Angle of light source and prism reflecting surface of display device according to Embodiment 3 of the present invention. 本発明の実施の形態４に係る表示装置の（ａ）正面図と（ｂ）側面図(A) Front view and (b) Side view of a display device according to Embodiment 4 of the present invention. 本発明の実施の形態５に係る表示装置の（ａ）正面図と（ｂ）側面図および（ｃ）光源とプリズム反射面の角度の説明図(A) Front view, (b) Side view and (c) Angle of light source and prism reflecting surface of display device according to Embodiment 5 of the present invention. 本発明の実施の形態６に係る表示装置の（ａ）正面図と（ｂ）側面図(A) Front view and (b) Side view of a display device according to Embodiment 6 of the present invention. 本発明の実施の形態７に係る表示装置の（ａ）正面図と（ｂ）側面図(A) Front view and (b) Side view of a display device according to Embodiment 7 of the present invention. 本発明の実施の形態８に係る表示装置の（ａ）正面図と（ｂ）側面図(A) Front view and (b) Side view of a display device according to Embodiment 8 of the present invention. 本発明の実施の形態９に係る表示装置の（ａ）斜視図と（ｂ）正面図(A) Perspective view and (b) Front view of a display device according to Embodiment 9 of the present invention 本発明の表示装置を搭載した遊技装置の正面図Front view of a gaming device equipped with a display device of the present invention 従来の表示装置の（ａ）正面図と（ｂ）側面図(A) Front view and (b) Side view of a conventional display device （ａ）遊技者の目が導光板の正面位置Ｉにある場合と正面からずれた位置IIにある場合の一つのプリズムの見え方の説明図と（ｂ）導光板の複数のプリズムにあてはめた時の概略説明図(A) An explanatory diagram of how one prism looks when the player's eyes are at the front position I of the light guide plate and at a position II deviated from the front, and (b) applied to a plurality of prisms of the light guide plate Schematic illustration of time （ａ）プリズムの集合体で形成されたパターンの説明図と、（ｂ）見え方の一例としてパターンの絵柄中に暗部が生じてしまう状態の説明図(A) An explanatory diagram of a pattern formed by an assembly of prisms, and (b) an explanatory diagram of a state in which a dark part is generated in a pattern pattern as an example of how it is seen. 撓みのある導光板１０１を正面位置Ｉから見た状況の説明図Explanatory drawing of the situation which looked at the light guide plate 101 with bending from the front position I

以下、本発明の各実施の形態を図面に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（実施の形態１）
図１（ａ）（ｂ）（ｃ）と図２は本発明の実施の形態１を示す。 (Embodiment 1)
1 (a), (b), (c) and FIG. 2 show Embodiment 1 of the present invention.

図１（ａ）（ｂ）に示したこの表示装置は、平板形状の光透過性を有する導光板１と、第１光源４を有している。導光板１は、平面形状が矩形の反射面２と平面形状が矩形で反射面２と対向する出射面６の間の端面である入射面５を有し、入射面５から導入した光を出射面６に向けて反射する複数の第１プリズム７が反射面２に形成されている。 The display device shown in FIGS. 1A and 1B has a light guide plate 1 having a flat plate-like light transmission property and a first light source 4. The light guide plate 1 has a reflecting surface 2 having a rectangular planar shape and an incident surface 5 that is an end surface between the emitting surface 6 having a rectangular planar shape and facing the reflecting surface 2, and emits light introduced from the incident surface 5. A plurality of first prisms 7 that reflect toward the surface 6 are formed on the reflecting surface 2.

第１プリズム７の形状の一例を図２に示す。第１プリズム７は、斜面２１と斜面２２とを有し、これらの面の１辺が繋がっている。繋がった辺２４の線分が長手方向となる。斜面２１の底辺の中心２３がプリズムの中心である。 An example of the shape of the first prism 7 is shown in FIG. The first prism 7 has an inclined surface 21 and an inclined surface 22, and one side of these surfaces is connected. The line segment of the connected side 24 is the longitudinal direction. The center 23 of the base of the slope 21 is the center of the prism.

複数の第１プリズム７は、第１パターン３の領域内に配列されている。図１（ａ）には、複数の第１プリズム７のうちの代表として７−１，７−２，７−３の３個を記載している。その他のプリズムを図示していないが、実際にはプリズムの集合体として第１パターン３の絵柄になるように多数のプリズムが存在する。 The plurality of first prisms 7 are arranged in the region of the first pattern 3. In FIG. 1A, three of 7-1, 7-2, and 7-3 are shown as representatives of the plurality of first prisms 7. Although other prisms are not shown, there are actually a large number of prisms so as to form the pattern of the first pattern 3 as an assembly of prisms.

第１光源４を発光させると、入射面５から導光板１の内部に入射して伝搬した光は、複数の第１プリズム７によって反射されて第１パターン３の絵柄が表示される。第１光源４の中心と第１プリズム７−１の中心２３を結ぶ線分の方向と、第１プリズム７−１の長手方向と垂直な方向とのなす角度が△θ７−１である。 When the first light source 4 emits light, the light that has entered the light guide plate 1 from the incident surface 5 and has propagated is reflected by the plurality of first prisms 7 to display the pattern of the first pattern 3. The angle between the direction of the line segment connecting the center of the first light source 4 and the center 23 of the first prism 7-1 and the direction perpendicular to the longitudinal direction of the first prism 7-1 is Δθ7-1.

同じく、第１光源４と第１プリズム７−２を結ぶ線分の方向と、第１プリズム７−２の長手方向と垂直な方向とのなす角度が△θ７−２である。第１光源４と第１プリズム７−３を結ぶ線分の方向と、第１プリズム７−３の長手方向と垂直な方向とのなす角度が△θ７−３である。 Similarly, the angle between the direction of the line segment connecting the first light source 4 and the first prism 7-2 and the direction perpendicular to the longitudinal direction of the first prism 7-2 is Δθ7-2. The angle between the direction of the line connecting the first light source 4 and the first prism 7-3 and the direction perpendicular to the longitudinal direction of the first prism 7-3 is Δθ7-3.

この角度について図１（ｃ）で説明する。 This angle will be described with reference to FIG.

第１光源４の中心と第１プリズム７−３の中心とを結ぶ線分と基準方向Ｙとの角度をθＬ７−３、第１プリズム７−３の長手方向と垂直な方向と基準方向Ｙとのなす角度をθｐ７−３とする。△θ７−３は、以下で表される。 The angle between the line segment connecting the center of the first light source 4 and the center of the first prism 7-3 and the reference direction Y is θL7-3, the direction perpendicular to the longitudinal direction of the first prism 7-3 and the reference direction Y Is defined as θp7-3. Δθ7-3 is expressed as follows.

△θ７−３＝（θＬ７−３）−（θｐ７−３）
△θ７−１，△θ７−２も同様に表される。これらの、△θ７−１，△θ７−２，△θ７−３を、以下の範囲でランダムな角度として与える。 Δθ7-3 = (θL7-3) − (θp7-3)
Δθ7-1 and Δθ7-2 are similarly expressed. These Δθ7-1, Δθ7-2, and Δθ7-3 are given as random angles in the following ranges.

｜△θ７−１｜ ≦ ４５°／２
｜△θ７−２｜ ≦ ４５°／２
｜△θ７−３｜ ≦ ４５°／２
このランダムな角度によって、第１光源４からの光は第１プリズム７で広い角度に広げられる。その角度は、光の反射の法則から、反射角度の２倍の角度として、およそ±４５°の範囲に広げられることになる。各プリズムはランダムに角度を有するため、ある方向から見た時、一部のプリズムからの光が目に届く。ところどころのプリズムから見える光の集合体として、第１パターン３の絵柄が認識される。このように第１パターン３の絵柄として認識できる範囲は、上記のように、およそ±４５°となる。また、導光板１に、成形等で反りや撓みが生じて導光板１内で光を導光する際に反射角度が変化しても、複数の第１プリズム７の向きにランダムな角度が設定されているため、どれかのプリズムで光を目の方向へ反射することになり、第１パターン３の絵柄を認識できる。 | Δθ7-1 | ≦ 45 ° / 2
| Δθ7-2 | ≦ 45 ° / 2
| Δθ7-3 | ≦ 45 ° / 2
Due to this random angle, the light from the first light source 4 is spread to a wide angle by the first prism 7. The angle is extended to a range of about ± 45 ° as an angle twice the reflection angle from the law of light reflection. Since each prism has a random angle, light from some prisms reaches the eye when viewed from a certain direction. The pattern of the first pattern 3 is recognized as an aggregate of light that can be seen from various prisms. Thus, the range that can be recognized as the pattern of the first pattern 3 is approximately ± 45 ° as described above. In addition, even when the light guide plate 1 is warped or bent by molding or the like and the reflection angle changes when light is guided in the light guide plate 1, random angles are set in the directions of the plurality of first prisms 7. Therefore, light is reflected in the direction of the eyes by any prism, and the pattern of the first pattern 3 can be recognized.

なお、ランダムな角度の範囲を大きくするほど、第１パターン３の絵柄として正しく認識できる角度は広くなるが、４５°より大きくなると、光の広がりが大きくなり、見る方向に出射する光の割合が小さくなり、暗くなってしまう。ランダム角度は４５°よりも小さいほうが良い。一例として、第１パターン３の面積は２０００ｍｍ^２以上３０００ｍｍ^２以下で、プリズムは１００００個以上、１００００００個以下とした。つまり、１ｍｍ^２あたり３．３個以上、５００個以下のプリズムを配列した。 Note that the larger the range of random angles, the wider the angle that can be correctly recognized as the pattern of the first pattern 3. However, when the angle is larger than 45 °, the spread of light increases, and the proportion of light emitted in the viewing direction It becomes smaller and darker. The random angle should be smaller than 45 °. As an example, the area of the first pattern 3 is 2000 mm ² or more 3000 mm ² or less, prism 10000 or more and 1,000,000 or less. That is, 3.3 to 500 prisms were arranged per 1 mm ² .

前記ランダムとは、±４５°／２内の分布を正規分布と近似し、正規分布の分散σにおいて、θｒ＝０の割合が、１σに相当する約７０％と同じかそれより少ない状態であって、パターン３の範囲内の第１プリズム７の総個数をｎＡ、角度θｒ＝０の第１プリズム７の個数をｎ０とした時に、ｎ０／ｎＡ ≦ ７０％である。 The random means that a distribution within ± 45 ° / 2 is approximated as a normal distribution, and in the distribution σ of the normal distribution, the ratio of θr = 0 is equal to or less than about 70% corresponding to 1σ. When the total number of the first prisms 7 within the pattern 3 is nA and the number of the first prisms 7 having the angle θr = 0 is n0, n0 / nA ≦ 70%.

（実施の形態２）
図３（ａ）（ｂ）は本発明の実施の形態２を示す。 (Embodiment 2)
3 (a) and 3 (b) show a second embodiment of the present invention.

なお、プリズムの形状など、特に説明のない箇所は実施の形態１と同じである。 Note that portions not particularly described, such as the shape of the prism, are the same as those in the first embodiment.

この表示装置の導光板１の反射面２には、第１パターン３の領域内に複数の第１プリズム７が配列され、第２パターン８の領域内に複数の第２プリズム１０が配列されている。第２プリズム１０の形状は、図２に示した第１プリズム７の形状の一例と同じである。 On the reflection surface 2 of the light guide plate 1 of the display device, a plurality of first prisms 7 are arranged in the region of the first pattern 3, and a plurality of second prisms 10 are arranged in the region of the second pattern 8. Yes. The shape of the second prism 10 is the same as an example of the shape of the first prism 7 shown in FIG.

第１プリズム７は、第１光源４から発して入射面５から導光板１内に入射した可視光を出射面６へ向けて反射する。第２プリズム１０は、第２光源９から発して入射面５から導光板１内に入射した光を出射面６へ向けて反射する。図３（ａ）には、第１，第２プリズム７，１０のうちの代表として７−１，１０−１のみ記載している。その他のプリズムを図示していないが、実際にはプリズムの集合体として第１パターン３や第２パターン８になるように多数のプリズムが存在する。第２光源９を消灯し、第１光源４を発光させると、第１パターン３の絵柄が表示され、第１光源４を消灯し、第２光源９を発光させると、第２パターン８の絵柄が表示される。 The first prism 7 reflects the visible light emitted from the first light source 4 and entering the light guide plate 1 from the incident surface 5 toward the output surface 6. The second prism 10 reflects light emitted from the second light source 9 and incident from the incident surface 5 into the light guide plate 1 toward the output surface 6. In FIG. 3A, only 7-1 and 10-1 are shown as representatives of the first and second prisms 7 and 10. Although other prisms are not shown, there are actually a large number of prisms so as to form the first pattern 3 and the second pattern 8 as an aggregate of prisms. When the second light source 9 is turned off and the first light source 4 is caused to emit light, the pattern of the first pattern 3 is displayed. When the first light source 4 is turned off and the second light source 9 is caused to emit light, the pattern of the second pattern 8 is displayed. Is displayed.

第１光源４の中心と第１プリズム７−１の中心を結ぶ線分の方向と、第１プリズム７−１の長手方向と垂直な方向とのなす角度が△θ７−１である。同じく、第２光源９の中心と第２プリズム１０−１の中心を結ぶ線分の方向と、第２プリズム１０−１の長手方向と垂直な方向とのなす角度が△θ１０−１である。 The angle between the direction of the line segment connecting the center of the first light source 4 and the center of the first prism 7-1 and the direction perpendicular to the longitudinal direction of the first prism 7-1 is Δθ7-1. Similarly, the angle between the direction of the line segment connecting the center of the second light source 9 and the center of the second prism 10-1 and the direction perpendicular to the longitudinal direction of the second prism 10-1 is Δθ10-1.

これらの△θ７−１，△θ１０−１を、以下の範囲でランダムな角度として与える。 These Δθ7-1 and Δθ10-1 are given as random angles in the following range.

｜△θ７−１｜ ≦ ４５°／４
｜△θ１０−１｜ ≦ ４５°／４
このランダムな角度によって、第１，第２光源４，９からの光は、それぞれ第１，第２プリズム７，１０で広い角度に広げられる。その角度は、光の反射の法則から、反射角度の２倍の角度として、およそ±４５°／２の範囲に広げられることになる。各プリズムはランダムに角度を有するため、ある方向から見た時、一部のプリズムからの光が目に届く。ところどころのプリズムから見える光の集合体として、第１パターン３の絵柄を認識できる。このように第１パターン３として認識できる範囲は、上記のように、およそ±４５°／２となる。また、導光板１に、成形等で反りや撓みが生じて導光板１内で光を導光する際に反射角度が変化しても、第１，第２プリズム７，１０の向きにランダムな角度が設定されているため、何れかのプリズムで光を目の方向へ反射することになり、第１パターン３，第２パターン８の絵柄を認識できる。 | Δθ7-1 | ≦ 45 ° / 4
| Δθ10-1 | ≦ 45 ° / 4
Due to this random angle, the light from the first and second light sources 4 and 9 is spread to a wide angle by the first and second prisms 7 and 10, respectively. The angle is expanded to a range of about ± 45 ° / 2 as an angle twice the reflection angle based on the law of light reflection. Since each prism has a random angle, light from some prisms reaches the eye when viewed from a certain direction. The pattern of the first pattern 3 can be recognized as an aggregate of light that can be seen from various prisms. Thus, the range that can be recognized as the first pattern 3 is approximately ± 45 ° / 2 as described above. Further, even when the light guide plate 1 is warped or bent by molding or the like and the reflection angle changes when light is guided in the light guide plate 1, the direction of the first and second prisms 7 and 10 is random. Since the angle is set, light is reflected in the direction of the eye by any prism, and the patterns of the first pattern 3 and the second pattern 8 can be recognized.

（実施の形態３）
図４（ａ）（ｂ）（ｃ）は本発明の実施の形態３を示す。 (Embodiment 3)
4 (a), 4 (b) and 4 (c) show a third embodiment of the present invention.

この表示装置の導光板１の反射面２には、第１パターン３の領域内に複数の第１プリズム７が配列されている。第１プリズム７は、２つの第１光源４−１，４−２から発して入射面５から導光板１内に入射した可視光を出射面６へ向けて反射する。図４（ａ）には、複数の第１プリズム７のうちの代表として７−１，７−２，７−３の３個を記載している。その他のプリズムを図示していないが、実際にはプリズムの集合体として第１パターン３になるように多数のプリズムが存在する。第１光源４−１，４−２を発光させると、第１パターン３の絵柄が表示される。 A plurality of first prisms 7 are arranged in the region of the first pattern 3 on the reflection surface 2 of the light guide plate 1 of the display device. The first prism 7 reflects the visible light emitted from the two first light sources 4-1 and 4-2 and entering the light guide plate 1 from the incident surface 5 toward the output surface 6. FIG. 4A shows three of the plurality of first prisms 7, 7-2 and 7-3 as representatives. Although other prisms are not shown, in practice, there are a large number of prisms so as to form the first pattern 3 as an aggregate of prisms. When the first light sources 4-1 and 4-2 are caused to emit light, the pattern of the first pattern 3 is displayed.

第１光源４−１，４−２の両端の点をそれぞれ４−１Ｌ，４−２Ｒとする。第１光源４−１，４−２の両端の幅Ｗ４は、第１パターン３の幅Ｗ３より小さい。点４−１Ｌと４−２Ｒから、第１パターン３の端を結んだ線を、それぞれ３Ｌ，３Ｒとする。線分３Ｌと３Ｒの交点を４−ｘとする。点４−１Ｌ，４−２Ｒ，４−ｘの３点で囲まれる領域内の点４−ｃと、第１プリズム７−１の中心を結ぶ線分の方向と、第１プリズム７−１の長手方向と垂直な方向とのなす角度が△θ７−１である。同じく、点４−ｃと第１プリズム７−２の中心を結ぶ線分の方向と、第１プリズム７−２の長手方向と垂直な方向とのなす角度が△θ７−２であり、点４−ｃと第１プリズム７−３の中心を結ぶ線分の方向と、第１プリズム７−３の長手方向と垂直な方向とのなす角度が△θ７−３である。 The points at both ends of the first light sources 4-1 and 4-2 are defined as 4-1L and 4-2R, respectively. The width W4 at both ends of the first light sources 4-1 and 4-2 is smaller than the width W3 of the first pattern 3. The lines connecting the ends of the first pattern 3 from the points 4-1L and 4-2R are defined as 3L and 3R, respectively. Let the intersection of the line segments 3L and 3R be 4-x. The direction of the line segment connecting the point 4-c in the region surrounded by the points 4-1L, 4-2R, 4-x and the center of the first prism 7-1, and the first prism 7-1 The angle between the longitudinal direction and the perpendicular direction is Δθ7-1. Similarly, the angle formed between the direction of the line segment connecting the point 4-c and the center of the first prism 7-2 and the direction perpendicular to the longitudinal direction of the first prism 7-2 is Δθ7-2. The angle formed between the direction of the line segment connecting −c and the center of the first prism 7-3 and the direction perpendicular to the longitudinal direction of the first prism 7-3 is Δθ7-3.

この角度について図４（ｃ）で説明する。 This angle will be described with reference to FIG.

導光板１に、ある基準方向Ｙを設定する。上記の点４−ｃと第１プリズム７−３とを結ぶ線分と基準方向Ｙとの角度がθＬ７−３、第１プリズム７−３の長手方向と垂直な方向と基準方向Ｙとのなす角度がθｐ７−３とする。△θ７−３は、以下で表される。 A certain reference direction Y is set on the light guide plate 1. The angle between the line segment connecting the point 4-c and the first prism 7-3 and the reference direction Y is θL7-3, and the direction perpendicular to the longitudinal direction of the first prism 7-3 is the reference direction Y. The angle is θp7-3. Δθ7-3 is expressed as follows.

｜△θ７−１｜ ≦ ４５°／２
｜△θ７−２｜ ≦ ４５°／２
｜△θ７−３｜ ≦ ４５°／２
このランダムな角度によって、第１光源４からの光は第１プリズム７で広い角度に広げられる。その角度は、光の反射の法則から、反射角度の２倍の角度として、およそ±４５°の範囲に広げられることになる。各プリズムはランダムに角度を有するため、ある方向から見た時、一部のプリズムからの光が目に届く。ところどころのプリズムから見える光の集合体として、第１パターン３の絵柄を認識できる。このように第１パターン３として認識できる範囲は、上記のように、およそ±４５°となる。また、導光板１に、成形等で反りや撓みが生じて導光板１内で光を導光する際に反射角度が変化しても、複数の第１プリズム７の向きにランダムな角度が設定されているため、どれかのプリズムで光を目の方向へ反射することになり、第１パターン３を認識できる。 | Δθ7-1 | ≦ 45 ° / 2
| Δθ7-2 | ≦ 45 ° / 2
| Δθ7-3 | ≦ 45 ° / 2
Due to this random angle, the light from the first light source 4 is spread to a wide angle by the first prism 7. The angle is extended to a range of about ± 45 ° as an angle twice the reflection angle from the law of light reflection. Since each prism has a random angle, light from some prisms reaches the eye when viewed from a certain direction. The pattern of the first pattern 3 can be recognized as an aggregate of light that can be seen from various prisms. Thus, the range that can be recognized as the first pattern 3 is approximately ± 45 ° as described above. In addition, even when the light guide plate 1 is warped or bent by molding or the like and the reflection angle changes when light is guided in the light guide plate 1, random angles are set in the directions of the plurality of first prisms 7. Therefore, light is reflected in the direction of the eye by any prism, and the first pattern 3 can be recognized.

なお、ランダムな角度の範囲を大きくするほど、第１パターン３として正しく認識できる角度は広くなるが、４５°より大きくなると、光の広がりが大きくなり、見る方向に出射する光の割合が小さくなり、暗くなってしまう。ランダム角度は４５°よりも小さいほうが良い。 The larger the range of random angles, the wider the angle that can be correctly recognized as the first pattern 3. However, when the angle is larger than 45 °, the spread of light increases and the proportion of light emitted in the viewing direction decreases. It will be dark. The random angle should be smaller than 45 °.

また、点４−ｃは、点４−１Ｌ，４−２Ｒ，４−ｘの３点で囲まれる領域内の１点で記載したが、複数の点を設定しても同じ効果が得られる。 Further, although the point 4-c is described as one point in the region surrounded by the three points 4-1L, 4-2R, and 4-x, the same effect can be obtained even if a plurality of points are set.

（実施の形態４）
図５（ａ）（ｂ）は本発明の実施の形態４を示す。 (Embodiment 4)
5 (a) and 5 (b) show a fourth embodiment of the present invention.

第１プリズム７は、第１光源４−１，４−２からなる第１光源群から発して入射面５から導光板１内に入射した可視光を出射面６へ向けて反射する。第２プリズム１０は、第２光源９−１，９−２からなる第２光源群から発して入射面５から導光板１内に入射した光を出射面６へ向けて反射する。図５（ａ）には、複数の第１，第２プリズム７，１０のうちの代表として７−１，１０−１のみ記載している。その他のプリズムを図示していないが、実際にはプリズムの集合体として第１パターン３や第２パターン８になるような多数のプリズムが存在する。第２光源９−１，９−２を消灯し、第１光源４−１，４−２を発光させると、第１パターン３の絵柄が表示され、第１光源４−１，４−２を消灯し、第２光源９−１，９−２を発光させると、第２パターン８の絵柄が表示される。 The first prism 7 reflects the visible light emitted from the first light source group including the first light sources 4-1 and 4-2 and entering the light guide plate 1 from the entrance surface 5 toward the exit surface 6. The second prism 10 reflects the light emitted from the second light source group including the second light sources 9-1 and 9-2 and entering the light guide plate 1 from the incident surface 5 toward the output surface 6. In FIG. 5A, only 7-1 and 10-1 are shown as representatives of the plurality of first and second prisms 7 and 10. Although other prisms are not shown, there are actually many prisms that form the first pattern 3 and the second pattern 8 as an aggregate of prisms. When the second light sources 9-1 and 9-2 are turned off and the first light sources 4-1 and 4-2 are caused to emit light, the pattern of the first pattern 3 is displayed, and the first light sources 4-1 and 4-2 are turned off. When the light is turned off and the second light sources 9-1 and 9-2 are caused to emit light, the pattern of the second pattern 8 is displayed.

第１光源４−１，４−２の両端の点をそれぞれ４−１Ｌ，４−２Ｒとする。第１光源４−１，４−２の両端の幅Ｗ４は、第１パターン３の幅Ｗ３より小さい。点４−１Ｌと４−２Ｒから、第１パターン３の端を結んだ線を、それぞれ３Ｌ，３Ｒとする。線分３Ｌと３Ｒの交点を４−ｘとする。 The points at both ends of the first light sources 4-1 and 4-2 are defined as 4-1L and 4-2R, respectively. The width W4 at both ends of the first light sources 4-1 and 4-2 is smaller than the width W3 of the first pattern 3. The lines connecting the ends of the first pattern 3 from the points 4-1L and 4-2R are defined as 3L and 3R, respectively. Let the intersection of the line segments 3L and 3R be 4-x.

同様に、第２光源９−１，９−２の両端の点をそれぞれ９−１Ｌ，９−２Ｒとする。第２光源９−１，９−２の両端の幅Ｗ９は、第２パターン８の幅Ｗ８より小さい。点９−１Ｌと９−２Ｒから、第２パターン８の端を結んだ線を、それぞれ８Ｌ，８Ｒとする。線分８Ｌと８Ｒの交点を９−ｘとする。 Similarly, the points on both ends of the second light sources 9-1 and 9-2 are 9-1L and 9-2R, respectively. The width W9 at both ends of the second light sources 9-1 and 9-2 is smaller than the width W8 of the second pattern 8. The lines connecting the ends of the second pattern 8 from the points 9-1L and 9-2R are 8L and 8R, respectively. Let the intersection of the line segments 8L and 8R be 9-x.

点４−１Ｌ，４−２Ｒ，４−ｘの３点で囲まれる領域内の点４−ｃと、第１プリズム７−１の中心を結ぶ線分の方向と、第１プリズム７−１の長手方向と垂直な方向とのなす角度が△θ７−１である。 The direction of the line segment connecting the point 4-c in the region surrounded by the points 4-1L, 4-2R, 4-x and the center of the first prism 7-1, and the first prism 7-1 The angle between the longitudinal direction and the perpendicular direction is Δθ7-1.

同じく、点９−１Ｌ，９−２Ｒ，９−ｘの３点で囲まれる領域内の点９−ｃと、第２プリズム１０−１の中心を結ぶ線分の方向と、第２プリズム１０−１の長手方向と垂直な方向とのなす角度が△θ１０−１である。 Similarly, the direction of the line segment connecting the point 9-c in the region surrounded by the three points 9-1L, 9-2R, 9-x and the center of the second prism 10-1, and the second prism 10- The angle formed between the longitudinal direction of 1 and the direction perpendicular thereto is Δθ10-1.

｜△θ７−１｜ ≦ ４５°／４
｜△θ１０−１｜ ≦ ４５°／４
このランダムな角度によって、第１，第２光源４−１，４−２，９−１，９−２からの光は、それぞれ第１，第２プリズム７，１０で広い角度に広げられる。その角度は、光の反射の法則から、反射角度の２倍の角度として、およそ±４５°／２の範囲に広げられることになる。各プリズムはランダムに角度を有するため、ある方向から見た時、一部のプリズムからの光が目に届く。ところどころのプリズムから見える光の集合体として、第１パターン３の絵柄を認識できる。このように第１パターン３として認識できる範囲は、上記のように、およそ±４５°／２となる。また、導光板１に、成形等で反りや撓みが生じて導光板１内で光を導光する際に反射角度が変化しても、第１プリズム７，第２プリズム１０の向きにランダムな角度が設定されているため、何れかのプリズムで光を目の方向へ反射することになり、第１パターン３、第２パターン８を認識できる。 | Δθ7-1 | ≦ 45 ° / 4
| Δθ10-1 | ≦ 45 ° / 4
Due to this random angle, the light from the first and second light sources 4-1, 4-2, 9-1 and 9-2 is spread to a wide angle by the first and second prisms 7 and 10, respectively. The angle is expanded to a range of about ± 45 ° / 2 as an angle twice the reflection angle based on the law of light reflection. Since each prism has a random angle, light from some prisms reaches the eye when viewed from a certain direction. The pattern of the first pattern 3 can be recognized as an aggregate of light that can be seen from various prisms. Thus, the range that can be recognized as the first pattern 3 is approximately ± 45 ° / 2 as described above. Even if the light guide plate 1 is warped or bent by molding or the like and the reflection angle changes when light is guided in the light guide plate 1, the direction of the first prism 7 and the second prism 10 is random. Since the angle is set, one of the prisms reflects light toward the eye, and the first pattern 3 and the second pattern 8 can be recognized.

なお、第２光源９−１，９−２を消灯し第１光源４−１，４−２を光らせた時に、第１光源４−１，４−２に対応する第１プリズム７だけでなく、第２光源９−１，９−２に対応する第２プリズム１０からの光も目に届くようになってしまい、絵柄を分離して表示できなくなってくる。絵柄を分離して表示させるには、ランダムな角度の範囲を±５°以下にすることが望ましい。 When the second light sources 9-1 and 9-2 are turned off and the first light sources 4-1 and 4-2 are turned on, not only the first prisms 7 corresponding to the first light sources 4-1 and 4-2 are used. The light from the second prism 10 corresponding to the second light sources 9-1 and 9-2 also reaches the eyes, so that the patterns cannot be separated and displayed. In order to separate and display the patterns, it is desirable that the range of random angles is ± 5 ° or less.

（実施の形態５）
図６（ａ）（ｂ）（ｃ）は本発明の実施の形態５を示す。 (Embodiment 5)
6A, 6B, and 6C show Embodiment 5 of the present invention.

この表示装置の導光板１の反射面２には、第１パターン３の領域内に複数の第１プリズム７が配列されている。第１プリズム７は、複数の第１光源４−１，４−２，・・・，４−ｎからなる光源群を発して入射面５から導光板１内に入射した可視光を出射面６へ向けて反射する。図６（ａ）には、複数の第１プリズム７のうちの代表として７−１，７−２，７−３の３個を記載している。その他のプリズムを図示していないが、実際にはプリズムの集合体として第１パターン３になるような多数のプリズムが存在する。第１光源４−１〜４−ｎを発光させると、第１パターン３の絵柄が表示される。 A plurality of first prisms 7 are arranged in the region of the first pattern 3 on the reflection surface 2 of the light guide plate 1 of the display device. The first prism 7 emits a light source group composed of a plurality of first light sources 4-1, 4-2,..., 4-n and emits visible light that has entered the light guide plate 1 from the incident surface 5. Reflect towards FIG. 6A shows three of the plurality of first prisms 7, 7-2 and 7-3 as representatives. Although other prisms are not shown, there are actually many prisms that form the first pattern 3 as an aggregate of prisms. When the first light sources 4-1 to 4-n emit light, the pattern of the first pattern 3 is displayed.

第１光源４−１，４−２，・・・，４−ｎの両端の点をそれぞれ４−１Ｌ，４−ｎＲとする。第１光源４−１，４−２，・・・，４−ｎの両端の幅Ｗ４は、第１パターン３の幅Ｗ３より小さい。点４−１Ｌと４−ｎＲから、第１パターン３の端を結んだ線を、それぞれ３Ｌ，３Ｒとする。線分３Ｌと３Ｒの交点を４−ｘとする。 The points at both ends of the first light sources 4-1, 4-2,..., 4-n are defined as 4-1L and 4-nR, respectively. The width W4 at both ends of the first light sources 4-1, 4-2, ..., 4-n is smaller than the width W3 of the first pattern 3. The lines connecting the ends of the first pattern 3 from the points 4-1L and 4-nR are defined as 3L and 3R, respectively. Let the intersection of the line segments 3L and 3R be 4-x.

点４−１Ｌ，４−ｎＲ，４−ｘの３点で囲まれる領域内の点４−ｃと、第１プリズム７−１の中心を結ぶ線分の方向と、第１プリズム７−１の長手方向と垂直な方向とのなす角度が△θ７−１である。同じく、点４−ｃと第１プリズム７−２の中心を結ぶ線分の方向と、第１プリズム７−２の長手方向と垂直な方向とのなす角度が△θ７−２であり、点４−ｃと第１プリズム７−３の中心を結ぶ線分の方向と、第１プリズム７−３の長手方向と垂直な方向とのなす角度が△θ７−３である。 The direction of the line segment connecting the point 4-c in the region surrounded by the points 4-1L, 4-nR, 4-x and the center of the first prism 7-1, and the first prism 7-1 The angle between the longitudinal direction and the perpendicular direction is Δθ7-1. Similarly, the angle formed between the direction of the line segment connecting the point 4-c and the center of the first prism 7-2 and the direction perpendicular to the longitudinal direction of the first prism 7-2 is Δθ7-2. The angle formed between the direction of the line segment connecting −c and the center of the first prism 7-3 and the direction perpendicular to the longitudinal direction of the first prism 7-3 is Δθ7-3.

この角度について図６（ｃ）で説明する。 This angle will be described with reference to FIG.

導光板１に、ある基準方向Ｙを設定する。点４−ｃと第１プリズム７−３とを結ぶ線分と基準方向Ｙとの角度がθＬ７−３、第１プリズム７−３の長手方向と垂直な方向と基準方向Ｙとのなす角度がθｐ７−３とする。△θ７−３は、以下で表される。 A certain reference direction Y is set on the light guide plate 1. The angle between the line segment connecting the point 4-c and the first prism 7-3 and the reference direction Y is θL7-3, and the angle between the direction perpendicular to the longitudinal direction of the first prism 7-3 and the reference direction Y is Let θp7-3. Δθ7-3 is expressed as follows.

｜△θ７−１｜ ≦ ４５°／２
｜△θ７−２｜ ≦ ４５°／２
｜△θ７−３｜ ≦ ４５°／２
このランダムな角度によって、第１光源４−１，４−２，・・・，４−ｎの光源群からの光は第１プリズム７で広い角度に広げられる。その角度は、光の反射の法則から、反射角度の２倍の角度として、およそ±４５°の範囲に広げられることになる。各プリズムはランダムに角度を有するため、ある方向から見た時、一部のプリズムからの光が目に届く。ところどころのプリズムから見える光の集合体として、第１パターン３の絵柄を認識できる。このように第１パターン３として認識できる範囲は、上記のように、およそ±４５°となる。また、導光板１に、成形等で反りや撓みが生じて導光板１内で光を導光する際に反射角度が変化しても、第１プリズム７の向きにランダムな角度が設定されているため、どれかのプリズムで光を目の方向へ反射することになり、第１パターン３を認識できる。 | Δθ7-1 | ≦ 45 ° / 2
| Δθ7-2 | ≦ 45 ° / 2
| Δθ7-3 | ≦ 45 ° / 2
The light from the light source group of the first light sources 4-1, 4-2,..., 4-n is spread at a wide angle by the first prism 7 by this random angle. The angle is extended to a range of about ± 45 ° as an angle twice the reflection angle from the law of light reflection. Since each prism has a random angle, light from some prisms reaches the eye when viewed from a certain direction. The pattern of the first pattern 3 can be recognized as an aggregate of light that can be seen from various prisms. Thus, the range that can be recognized as the first pattern 3 is approximately ± 45 ° as described above. Even if the light guide plate 1 is warped or bent by molding or the like and the reflection angle changes when light is guided in the light guide plate 1, a random angle is set in the direction of the first prism 7. Therefore, the light is reflected in the direction of the eye by any prism, and the first pattern 3 can be recognized.

（実施の形態６）
図７（ａ）（ｂ）本発明の実施の形態６を示す。 (Embodiment 6)
7 (a) and 7 (b) show a sixth embodiment of the present invention.

第１プリズム７は、第１光源４−１，４−２，・・・，４−ｎからなる第１光源群から発して入射面５から導光板１内に入射した可視光を出射面６へ向けて反射する。第２プリズム１０は、第２光源９−１，９−２，・・・，９−ｎからなる第２光源群から発して入射面５から導光板１内に入射した光を出射面６へ向けて反射する。図７（ａ）には、複数の第１，第２プリズム７，１０のうちの代表として７−１，１０−１のみ記載している。その他のプリズムを図示していないが、実際にはプリズムの集合体として第１パターン３や第２パターン８になるような多数のプリズムが存在する。第２光源９−１，９−２，・・・，９−ｎを消灯し、第１光源４−１，４−２，・・・，４−ｎを発光させると、第１パターン３の絵柄が表示され、第１光源４−１，４−２，・・・，４−ｎを消灯し、第２光源９−１，９−２，・・・，９−ｎを発光させると、第２パターン８の絵柄が表示される。 The first prism 7 emits visible light emitted from the first light source group including the first light sources 4-1, 4-2,..., 4-n and entering the light guide plate 1 from the incident surface 5. Reflect towards The second prism 10 emits light, which is emitted from the second light source group including the second light sources 9-1, 9-2,. Reflect toward you. FIG. 7A shows only 7-1 and 10-1 as representatives of the plurality of first and second prisms 7 and 10. Although other prisms are not shown, there are actually many prisms that form the first pattern 3 and the second pattern 8 as an aggregate of prisms. When the second light sources 9-1, 9-2,..., 9-n are turned off and the first light sources 4-1, 4-2,. When the pattern is displayed, the first light sources 4-1, 4-2,..., 4-n are turned off, and the second light sources 9-1, 9-2,. The pattern of the second pattern 8 is displayed.

第１光源４−１，４−２，・・・，４−ｎの両端の点をそれぞれ４−１Ｌ、４−ｎＲとする。第１光源４−１，４−２，・・・，４−ｎの両端の幅Ｗ４は、第１パターン３の幅Ｗ３より小さい。点４−１Ｌと４−ｎＲから、第１パターン３の端を結んだ線を、それぞれ３Ｌ，３Ｒとする。線分３Ｌと３Ｒの交点を４−ｘとする。 The points at both ends of the first light sources 4-1, 4-2,..., 4-n are denoted as 4-1L and 4-nR, respectively. The width W4 at both ends of the first light sources 4-1, 4-2, ..., 4-n is smaller than the width W3 of the first pattern 3. The lines connecting the ends of the first pattern 3 from the points 4-1L and 4-nR are defined as 3L and 3R, respectively. Let the intersection of the line segments 3L and 3R be 4-x.

同様に、第２光源９−１，９−２，・・・，９−ｎの両端の点をそれぞれ９−１Ｌ，９−ｎＲとする。第２光源９−１，９−２，・・・，９−ｎの両端の幅Ｗ９は、第２パターン８の幅Ｗ８より小さい。点９−１Ｌと９−２Ｒから、第２パターン８の端を結んだ線を、それぞれ８Ｌ，８Ｒとする。線分８Ｌと８Ｒの交点を９−ｘとする。 Similarly, the points on both ends of the second light sources 9-1, 9-2,..., 9-n are 9-1L and 9-nR, respectively. The width W9 at both ends of the second light sources 9-1, 9-2,..., 9-n is smaller than the width W8 of the second pattern 8. The lines connecting the ends of the second pattern 8 from the points 9-1L and 9-2R are 8L and 8R, respectively. Let the intersection of the line segments 8L and 8R be 9-x.

これらの、△θ７−１，△θ１０−１を、以下の範囲でランダムな角度として与える。 These Δθ7-1 and Δθ10-1 are given as random angles in the following range.

｜△θ７−１｜ ≦ ４５°／４
｜△θ１０−１｜ ≦ ４５°／４
このランダムな角度によって、第１光源４−１，４−２，・・・，４−ｎ，第２光源９−１，９−２，・・・，９−ｎからの光は、それぞれ第１，第２プリズム７，１０で広い角度に広げられる。その角度は、光の反射の法則から、反射角度の２倍の角度として、およそ±４５°／２の範囲に広げられることになる。各プリズムはランダムに角度を有するため、ある方向から見た時、一部のプリズムからの光が目に届く。ところどころのプリズムから見える光の集合体として、第１パターン３の絵柄を認識できる。このように第１パターン３として認識できる範囲は、上記のように、およそ±４５°／２となる。また、導光板１に、成形等で反りや撓みが生じて導光板１内で光を導光する際に反射角度が変化しても、第１，第２プリズム７，１０の向きにランダムな角度が設定されているため、どれかのプリズムで光を目の方向へ反射することになり、第１，第２パターン３，８を認識できる。 | Δθ7-1 | ≦ 45 ° / 4
| Δθ10-1 | ≦ 45 ° / 4
The light from the first light sources 4-1, 4-2,..., 4-n and the second light sources 9-1, 9-2,. The first and second prisms 7 and 10 are widened at a wide angle. The angle is expanded to a range of about ± 45 ° / 2 as an angle twice the reflection angle based on the law of light reflection. Since each prism has a random angle, light from some prisms reaches the eye when viewed from a certain direction. The pattern of the first pattern 3 can be recognized as an aggregate of light that can be seen from various prisms. Thus, the range that can be recognized as the first pattern 3 is approximately ± 45 ° / 2 as described above. Further, even when the light guide plate 1 is warped or bent by molding or the like and the reflection angle changes when light is guided in the light guide plate 1, the direction of the first and second prisms 7 and 10 is random. Since the angle is set, one of the prisms reflects light toward the eye, and the first and second patterns 3 and 8 can be recognized.

なお、第２光源９−１，９−２，・・・，９−ｎを消灯し第１光源４−１〜４−ｎを光らせた時に、第１光源４−１〜４−ｎに対応する第１プリズム７だけでなく、第２光源９−１〜９−ｎに対応する第２プリズム１０からの光も目に届くようになってしまい、絵柄を分離して表示できなくなってくる。絵柄を分離して表示させるには、ランダムな角度の範囲を±５°以下にすることが望ましい。 In addition, when the second light sources 9-1, 9-2,..., 9-n are turned off and the first light sources 4-1 to 4-n are turned on, they correspond to the first light sources 4-1 to 4-n. As a result, not only the first prism 7 but also the light from the second prism 10 corresponding to the second light sources 9-1 to 9-n reaches the eyes, and the images cannot be separated and displayed. In order to separate and display the patterns, it is desirable that the range of random angles is ± 5 ° or less.

（実施の形態７）
図８（ａ）（ｂ）は本発明の実施の形態７を示す。 (Embodiment 7)
8 (a) and 8 (b) show a seventh embodiment of the present invention.

この表示装置の導光板１の反射面２には、第１パターン３の領域内に複数の第１プリズム７が配列されている。第１プリズム７は、複数の第１光源４−１，４−２，・・・，４−ｎからなる光源群を発して入射面５から導光板１内に入射した可視光を出射面６へ向けて反射する。図８（ａ）には、複数の第１プリズム７のうちの代表として７−１，７−２，７−３の３個を記載している。その他のプリズムを図示していないが、実際にはプリズムの集合体として第１パターン３になるような多数のプリズムが存在する。第１光源４−１〜４−ｎを発光させると、第１パターン３の絵柄が表示される。 A plurality of first prisms 7 are arranged in the region of the first pattern 3 on the reflection surface 2 of the light guide plate 1 of the display device. The first prism 7 emits a light source group composed of a plurality of first light sources 4-1, 4-2,..., 4-n and emits visible light that has entered the light guide plate 1 from the incident surface 5. Reflect towards In FIG. 8A, three of 7-1, 7-2, and 7-3 are shown as representatives of the plurality of first prisms 7. Although other prisms are not shown, there are actually many prisms that form the first pattern 3 as an aggregate of prisms. When the first light sources 4-1 to 4-n emit light, the pattern of the first pattern 3 is displayed.

第１光源４−１〜４−ｎのうち第１プリズム７−１が最も近い光源（図８では、第１光源４−１）と第１プリズム７−１の中心を結ぶ線分の方向と、第１プリズム７−１の長手方向と垂直な方向とのなす角度が△θ７−１である。同じく、第１光源４−１〜４−ｎのうち第１プリズム７−２が最も近い光源（図８では第１光源４−ｎ）と第１プリズム７−２の中心を結ぶ線分の方向と、第１プリズム７−２の長手方向と垂直な方向とのなす角度が△θ７−２である。同じく、第１光源４−１〜４−ｎのうち第１プリズム７−３が最も近い光源（図８では第１光源４−２）と第１プリズム７−３の中心を結ぶ線分の方向と、第１プリズム７−３の長手方向と垂直な方向とのなす角度が△θ７−３である。 Among the first light sources 4-1 to 4-n, the first prism 7-1 is the closest light source (the first light source 4-1 in FIG. 8) and the direction of the line segment connecting the centers of the first prisms 7-1. The angle between the longitudinal direction of the first prism 7-1 and the direction perpendicular to the first prism 7-1 is Δθ7-1. Similarly, among the first light sources 4-1 to 4-n, the direction of the line segment connecting the light source closest to the first prism 7-2 (first light source 4-n in FIG. 8) and the center of the first prism 7-2. And the angle between the longitudinal direction of the first prism 7-2 and the direction perpendicular thereto is Δθ7-2. Similarly, of the first light sources 4-1 to 4-n, the direction of the line segment connecting the light source (first light source 4-2 in FIG. 8) closest to the first prism 7-3 and the center of the first prism 7-3. And the angle formed by the direction perpendicular to the longitudinal direction of the first prism 7-3 is Δθ7-3.

これらの△θ７−１，△θ７−２，△θ７−３を、以下の範囲でランダムな角度として与える。 These Δθ7-1, Δθ7-2, and Δθ7-3 are given as random angles in the following range.

（実施の形態８）
図９（ａ）（ｂ）は本発明の実施の形態８を示す。 (Embodiment 8)
9 (a) and 9 (b) show an eighth embodiment of the present invention.

第１プリズム７は、第１光源４から発して入射面５から導光板１内に入射した可視光を出射面６へ向けて反射する。第２プリズム１０は、第２光源９から発して入射面５ｂから導光板１内に入射した光を出射面６へ向けて反射する。入射面５ｂは、導光板１の反射面２と出射面６の間の側面で入射面５に隣接している。図９（ａ）には、複数の第１，第２プリズム７，１０のうちの代表として７−１，１０−１のみ記載している。その他のプリズムを図示していないが、実際にはプリズムの集合体として第１パターン３や第２パターン８になるような多数のプリズムが存在する。第２光源９を消灯し、第１光源４を発光させると、第１パターン３の絵柄が表示され、第１光源４を消灯し、第２光源９を発光させると、第２パターン８の絵柄が表示される。 The first prism 7 reflects the visible light emitted from the first light source 4 and entering the light guide plate 1 from the incident surface 5 toward the output surface 6. The second prism 10 reflects the light emitted from the second light source 9 and incident on the light guide plate 1 from the incident surface 5 b toward the output surface 6. The incident surface 5 b is adjacent to the incident surface 5 on the side surface between the reflecting surface 2 and the exit surface 6 of the light guide plate 1. FIG. 9A shows only 7-1 and 10-1 as representatives of the plurality of first and second prisms 7 and 10. Although other prisms are not shown, there are actually many prisms that form the first pattern 3 and the second pattern 8 as an aggregate of prisms. When the second light source 9 is turned off and the first light source 4 is caused to emit light, the pattern of the first pattern 3 is displayed. When the first light source 4 is turned off and the second light source 9 is caused to emit light, the pattern of the second pattern 8 is displayed. Is displayed.

第１光源４と第１プリズム７−１の中心を結ぶ線分の方向と、第１プリズム７−１の長手方向と垂直な方向とのなす角度が△θ７−１である。同じく、第２光源９と第２プリズム１０−１の中心を結ぶ線分の方向と、第２プリズム１０−１の長手方向と垂直な方向とのなす角度が△θ１０−１である。 The angle formed between the direction of the line connecting the center of the first light source 4 and the first prism 7-1 and the direction perpendicular to the longitudinal direction of the first prism 7-1 is Δθ7-1. Similarly, the angle between the direction of the line segment connecting the second light source 9 and the center of the second prism 10-1 and the direction perpendicular to the longitudinal direction of the second prism 10-1 is Δθ10-1.

｜△θ７−１｜ ≦ ４５°／４
｜△θ１０−１｜ ≦ ４５°／４
このランダムな角度によって、第１，第２光源４，９からの光は、それぞれ第１，第２プリズム７，１０で広い角度に広げられる。その角度は、光の反射の法則から、反射角度の２倍の角度として、およそ±４５°／２の範囲に広げられることになる。各プリズムはランダムに角度を有するため、ある方向から見た時、一部のプリズムからの光が目に届く。ところどころのプリズムから見える光の集合体として、第１パターン３の絵柄を認識できる。このように第１パターン３として認識できる範囲は、上記のように、およそ４５°／２となる。また、導光板１に、成形等で反りや撓みが生じて導光板１内で光を導光する際に反射角度が変化しても、第１，第２プリズム７，１０の向きにランダムな角度が設定されているため、どれかのプリズムで光を目の方向へ反射することになり、第１，第２パターン３，８を認識できる。 | Δθ7-1 | ≦ 45 ° / 4
| Δθ10-1 | ≦ 45 ° / 4
Due to this random angle, the light from the first and second light sources 4 and 9 is spread to a wide angle by the first and second prisms 7 and 10, respectively. The angle is expanded to a range of about ± 45 ° / 2 as an angle twice the reflection angle based on the law of light reflection. Since each prism has a random angle, light from some prisms reaches the eye when viewed from a certain direction. The pattern of the first pattern 3 can be recognized as an aggregate of light that can be seen from various prisms. Thus, the range that can be recognized as the first pattern 3 is approximately 45 ° / 2 as described above. Further, even when the light guide plate 1 is warped or bent by molding or the like and the reflection angle changes when light is guided in the light guide plate 1, the direction of the first and second prisms 7 and 10 is random. Since the angle is set, one of the prisms reflects light toward the eye, and the first and second patterns 3 and 8 can be recognized.

なお、ランダムな角度の範囲を大きくするほど、第１パターン３として正しく認識できる角度は広くなるが、４５°より大きくなると、光の広がりが大きくなり、見る方向に出射する光の割合が小さくなり、暗くなってしまう。さらに、第２光源９を消灯し第１光源４を光らせた時に、第１光源４に対応する第１プリズム７だけでなく、第２光源９に対応する第２プリズム１０からの光も目に届くようになってしまい、絵柄を分離して表示できなくなってくる。絵柄を分離して表示させるには、ランダムな角度の範囲を±５°以下にすることが望ましい。 The larger the range of random angles, the wider the angle that can be correctly recognized as the first pattern 3. However, when the angle is larger than 45 °, the spread of light increases and the proportion of light emitted in the viewing direction decreases. It will be dark. Further, when the second light source 9 is turned off and the first light source 4 is lit, not only the first prism 7 corresponding to the first light source 4 but also the light from the second prism 10 corresponding to the second light source 9 is visible. As a result, it becomes impossible to separate and display the pattern. In order to separate and display the patterns, it is desirable that the range of random angles is ± 5 ° or less.

（実施の形態９）
図１０（ａ）（ｂ）は本発明の実施の形態９を示す。 (Embodiment 9)
10 (a) and 10 (b) show Embodiment 9 of the present invention.

この表示装置の導光板１の反射面２には、第１パターン３の領域内に複数の第１プリズム７が配列されている。第１プリズム７は、第１光源４から発して立体的な導光部５１から入射面５を通って入射した可視光を出射面６へ向けて反射する。立体的な導光板５１とは、図１で示したような平板でなく、例えば平面から折り曲げられたような形状の導光板を示す。 A plurality of first prisms 7 are arranged in the region of the first pattern 3 on the reflection surface 2 of the light guide plate 1 of the display device. The first prism 7 reflects the visible light emitted from the first light source 4 and incident from the three-dimensional light guide 51 through the incident surface 5 toward the output surface 6. The three-dimensional light guide plate 51 is not a flat plate as shown in FIG. 1, but a light guide plate having a shape bent from a plane, for example.

図１０（ｂ）には、複数の第１プリズム７のうちの代表として７−１，７−２，７−３の３個を記載している。その他のプリズムを図示していないが、実際にはプリズムの集合体として第１パターン３になるような多数のプリズムが存在する。第１光源４を発光させると、第１パターン３の絵柄が表示される。 In FIG. 10B, three of 7-1, 7-2, and 7-3 are shown as representatives of the plurality of first prisms 7. Although other prisms are not shown, there are actually many prisms that form the first pattern 3 as an aggregate of prisms. When the first light source 4 emits light, the pattern of the first pattern 3 is displayed.

導光部５１が入射面５とつながる部位の中心にあたる点を４０とする。第１光源４から導光部５１を通って、絵柄パターンが形成される導光板の反射面２に光が導光される。反射面２に照射される光は、入射面５と導光部５１とが接続された部位から伝搬してくるため、その中心である４０は仮想的に光源とみなせる。４０と第１プリズム７−１を結ぶ線分の方向と、第１プリズム７−１の長手方向と垂直な方向とのなす角度が△θ７−１である。同じく、４０と第１プリズム７−２を結ぶ線分の方向と、第１プリズム７−２の長手方向と垂直な方向とのなす角度が△θ７−２であり、４０と第１プリズム７−３を結ぶ線分の方向と、第１プリズム７−３の長手方向と垂直な方向とのなす角度が△θ７−３である。これらの、△θ７−１，△θ７−２，△θ７−３を、以下の範囲でランダムな角度として与える。 A point corresponding to the center of the part where the light guide 51 is connected to the incident surface 5 is defined as 40. Light is guided from the first light source 4 through the light guide 51 to the reflecting surface 2 of the light guide plate on which the pattern is formed. Since the light irradiated on the reflecting surface 2 propagates from a portion where the incident surface 5 and the light guide unit 51 are connected, the center 40 can be virtually regarded as a light source. The angle between the direction of the line segment connecting 40 and the first prism 7-1 and the direction perpendicular to the longitudinal direction of the first prism 7-1 is Δθ7-1. Similarly, the angle between the direction of the line segment connecting 40 and the first prism 7-2 and the direction perpendicular to the longitudinal direction of the first prism 7-2 is Δθ7-2, and 40 and the first prism 7− The angle between the direction of the line segment connecting 3 and the direction perpendicular to the longitudinal direction of the first prism 7-3 is Δθ7-3. These Δθ7-1, Δθ7-2, and Δθ7-3 are given as random angles in the following ranges.

｜△θ７−１｜ ≦ ４５°／２
｜△θ７−２｜ ≦ ４５°／２
｜△θ７−３｜ ≦ ４５°／２
このランダムな角度によって、第１光源４からの光は第１プリズム７で広い角度に広げられる。その角度は、光の反射の法則から、反射角度の２倍の角度として、およそ±４５°の範囲に広げられることになる。各プリズムはランダムに角度を有するため、ある方向から見た時、一部のプリズムからの光が目に届く。ところどころのプリズムから見える光の集合体として、第１パターン３の絵柄を認識できる。このように第１パターン３として認識できる範囲は、上記のように、およそ±４５°となる。また、導光板１に、成形等で反りや撓みが生じて導光板１内で光を導光する際に反射角度が変化しても、第１プリズム７の向きにランダムな角度が設定されているため、どれかのプリズムで光を目の方向へ反射することになり、第１パターン３を認識できる。 | Δθ7-1 | ≦ 45 ° / 2
| Δθ7-2 | ≦ 45 ° / 2
| Δθ7-3 | ≦ 45 ° / 2
Due to this random angle, the light from the first light source 4 is spread to a wide angle by the first prism 7. The angle is extended to a range of about ± 45 ° as an angle twice the reflection angle from the law of light reflection. Since each prism has a random angle, light from some prisms reaches the eye when viewed from a certain direction. The pattern of the first pattern 3 can be recognized as an aggregate of light that can be seen from various prisms. Thus, the range that can be recognized as the first pattern 3 is approximately ± 45 ° as described above. Even if the light guide plate 1 is warped or bent by molding or the like and the reflection angle changes when light is guided in the light guide plate 1, a random angle is set in the direction of the first prism 7. Therefore, the light is reflected in the direction of the eye by any prism, and the first pattern 3 can be recognized.

本発明の各実施の形態では、プリズムの向きにランダムな角度が設定したため、視点の位置が変動しても表示絵柄を見えやすくできたが、これに対して図１２などに挙げた従来の表示装置では、複数のプリズムの向きは光源に正対であって、ランダムな角度が設定されていない。 In each embodiment of the present invention, since a random angle is set in the direction of the prism, the display pattern can be easily seen even if the position of the viewpoint fluctuates. On the other hand, the conventional display shown in FIG. In the apparatus, the directions of the plurality of prisms are directly facing the light source, and no random angle is set.

（実施の形態１０）
図１１は本発明の表示装置を使用したパチンコ等の遊技装置を示す。 (Embodiment 10)
FIG. 11 shows a game machine such as a pachinko machine using the display device of the present invention.

２０は遊戯機本体の模式図であり、実施の形態１〜９で説明した導光板１の周辺に発光ダイオードなどの光源が配置されるが省略している。遊戯者の視点の位置の変動に対応するため、実施の形態１〜９で説明した何れかの導光板１を使い、これにより表示絵柄を見えやすくしている。 20 is a schematic diagram of a game machine main body, and a light source such as a light emitting diode is arranged around the light guide plate 1 described in the first to ninth embodiments, but is omitted. In order to cope with a change in the position of the player's viewpoint, any one of the light guide plates 1 described in the first to ninth embodiments is used, thereby making it easy to see the display pattern.

本発明は、例えば、家庭用、産業用、車載向けなどの電気機器や装置、あるいは遊戯装置などに用いられる表示装置の品質の向上に寄与する。 The present invention contributes to improving the quality of display devices used in, for example, household appliances, industrial appliances, in-vehicle appliances and devices, or game machines.

１導光板
２反射面
３，８第１，第２パターン
４，９第１，第２光源
５入射面
６出射面
７，１０第１，第２プリズム
２０遊戯機本体 DESCRIPTION OF SYMBOLS 1 Light guide plate 2 Reflecting surface 3,8 1st, 2nd pattern 4,9 1st, 2nd light source 5 Incident surface 6 Outgoing surface 7,10 1st, 2nd prism 20 Main body of game machine

Claims

A light guide plate that propagates the light incident from the end face, reflects the light by the first prism provided on the reflection surface, and emits the light from the emission surface facing the reflection surface;
A light source that makes light incident on an end face of the light guide plate, and a display device in which a pattern is formed by an assembly of a plurality of the first prisms;
An angle θr formed by the direction of a line segment connecting the center of the light source and the center of the first prism and a direction perpendicular to the longitudinal direction of the first prism is:
−45 ° / 2 ≦ θr ≦ 45 ° / 2
And the angle θr of each of the plurality of first prisms is randomly dispersed within the range of the pattern.

N0 / nA ≦ 70%, where nA is the total number of the first prisms within the range of the pattern and n0 is the number of the first prisms having an angle θr = 0.
The display device according to claim 1.

A light guide plate that propagates the light incident from the end face, reflects the light by the first prism provided on the reflection surface, and emits the light from the emission surface facing the reflection surface;
A display device including a plurality of light sources that make light incident on an end face of the light guide plate, wherein a pattern is formed by an assembly of the plurality of first prisms;
The distance between both ends of the plurality of light sources is smaller than the width of the pattern,
A direction of a line segment connecting a point in an area formed by three intersections of line segments connecting both ends of the plurality of light sources and an end of the pattern, and a center of the first prism; and the first prism The angle θr formed between the longitudinal direction and the direction perpendicular to
−45 ° / 2 ≦ θr ≦ 45 ° / 2
And the angle θr of each of the plurality of first prisms is randomly dispersed within the range of the pattern.

A light guide plate that propagates light incident from the end surface, reflects the light by the prism provided on the reflection surface, and emits the light from the emission surface facing the reflection surface;
A display device including a plurality of light sources that make light incident on an end face of the light guide plate, wherein a pattern is formed by an assembly of the plurality of first prisms;
An angle θr formed by a direction of a line segment connecting a light source closest to each of the first prisms among the plurality of light sources and a center of the first prism, and a direction perpendicular to the longitudinal direction of the first prism,
−45 ° / 2 ≦ θr ≦ 45 ° / 2
And the angle θr of each of the plurality of first prisms is randomly dispersed within the range of the pattern.

A light guide plate that propagates light incident from the end face, is reflected by first and second prisms provided on the reflection surface, and is emitted from an emission surface facing the reflection surface;
Comprising first and second light sources that allow light to enter the end face of the light guide plate;
A first pattern is formed by reflecting light from the first light source by an assembly of the plurality of first prisms,
In a display device in which a second pattern is formed by reflecting light from the second light source by an assembly of a plurality of the second prisms,
An angle θr7 formed by a direction of a line segment connecting the first light source and the center of the first prism and a direction perpendicular to the longitudinal direction of the first prism is:
−45 ° / 4 ≦ θr7 ≦ 45 ° / 4
And the angle θr7 of each of the plurality of first prisms is randomly distributed within the range of the first pattern.
An angle θr10 formed by a direction of a line segment connecting the second light source and the center of the second prism and a direction perpendicular to the longitudinal direction of the second prism is:
−45 ° / 4 ≦ θr10 ≦ 45 ° / 4
And the angle θr10 of each of the plurality of second prisms is randomly dispersed within the range of the second pattern.

A light guide plate that propagates light incident from the end face, is reflected by first and second prisms provided on the reflection surface, and is emitted from an emission surface facing the reflection surface;
A plurality of first light sources for causing light to enter the end face of the light guide plate;
A plurality of second light sources that allow light to enter the end face of the light guide plate;
A first pattern is formed by reflecting light from the first light source by an assembly of the plurality of first prisms,
In a display device in which a second pattern is formed by reflecting light from the second light source by an assembly of a plurality of the second prisms,
The distance between both ends of the first light source is smaller than the width of the first pattern,
The distance between both ends of the second light source is smaller than the width of the second pattern,
An intersection of a line segment connecting both ends of the first light source and the end of the first pattern, a point in an area formed by three points on both ends of the first light source, and the center of the first prism are connected. An angle θr7 formed by the direction of the line segment and the direction perpendicular to the longitudinal direction of the first prism is:
−45 ° / 4 ≦ θr7 ≦ 45 ° / 4
And the angle θr7 of each of the plurality of first prisms is randomly distributed within the range of the first pattern.
An intersection of a line segment connecting the end of the second light source and the end of the second pattern, a point in a region formed by three points on both ends of the second light source, and the center of the second prism are connected. An angle θr10 formed by the direction of the line segment and the direction perpendicular to the longitudinal direction of the second prism is:
−45 ° / 4 ≦ θr10 ≦ 45 ° / 4
And the angle θr10 of each of the plurality of second prisms is randomly dispersed within the range of the second pattern.

A light guide plate that propagates light incident from the end face, is reflected by first and second prisms provided on the reflection surface, and is emitted from an emission surface facing the reflection surface;
A first light source for causing light to enter the end face of the light guide plate;
A second light source for allowing light to enter the end face of the light guide plate,
A first pattern is formed by reflecting light from the first light source by an assembly of the plurality of first prisms,
In a display device in which a second pattern is formed by reflecting light from the second light source by an assembly of a plurality of the second prisms,
An interval between both ends of the plurality of first light sources is smaller than a width of the first pattern,
An interval between both ends of the plurality of second light sources is smaller than a width of the second pattern,
A direction of a line segment connecting a point in a region formed by three intersections of line segments connecting both ends of the first light source and the end of the first pattern, and the center of the first prism; The angle θr7 formed by the longitudinal direction of one prism and the direction perpendicular thereto is
−45 ° / 4 ≦ θr7 ≦ 45 ° / 4
And the angle θr7 of each of the plurality of first prisms is randomly distributed within the range of the first pattern.
A direction of a line segment connecting a point in an area formed by three intersections of line segments connecting both ends of the second light source and an end of the second pattern, and the center of the second prism; The angle θr10 formed between the longitudinal direction of the two prisms and the direction perpendicular thereto is
−45 ° / 4 ≦ θr10 ≦ 45 ° / 4
And the angle θr10 of each of the plurality of second prisms is randomly dispersed within the range of the second pattern.

A gaming device equipped with the display device according to claim 1.