JP2021002065A - Display - Google Patents

Abstract

To make it possible, in a display using a light guide plate having a plurality of patterns recorded therein, to beautifully display only a pattern desired to be displayed.SOLUTION: A display has a light guide plate 51 that has a first side face 3 and a second side face 23 orthogonal to each other and propagates light incident to the inside thereof from the first side face 3 and the second side face 23. The display reflects light incident on the light guide plate 51 from the first side face 3 and second side face 23 and coming from a first light source unit and a second light source unit Ph2 on a top face 2b of the light guide plate 51 with first and second reflection units formed on a bottom face 2a of the light guide plate 51, emits the light to the outside of the light guide plate 51, and displays first and second patterns. When the thickness of the second side face 23 of the light guide plate 51 is T, the length of the second light source unit Ph2 in the thickness direction of the light guide plate 51 is t_LS, and the distance between the center of the thickness of the second side face 23 of the light guide plate 51 and the center of the length of the second light source unit Ph2 in the thickness direction of the light guide plate 51 is ▵c, T>t_LS>▵c is satisfied.SELECTED DRAWING: Figure 16

Description

The present invention relates to a display device that switches and displays a plurality of display information in one display area of one light guide plate.

In a general display device using a light guide plate, light emitted from a light emitting element such as a light emitting diode is incident on the inside of the light guide plate from the bottom surface, the upper surface, and the side surface of the light guide plate, and the incident light. Has an optical display structure that efficiently reflects light inside the light guide plate and emits light from the display region on the upper surface of the light guide plate. A large number of fine concave-shaped reflecting portions are formed on the bottom surface of the light guide plate in order to efficiently reflect or refract the emitted light.

As shown in FIGS. 17 (a) and 17 (b), the concave-shaped reflecting portion has the shape of a conical reflecting portion 61 or a hemispherical reflecting portion 62 that is recessed inward from the bottom surface of the light guide plate. Reflects light coming in from all directions as outgoing light, so that only one pattern can be displayed in one display area of one light guide plate.

Therefore, when it is desired to display a plurality of patterns in one display area such as a game machine such as a pachinko machine or a pachislot machine, the display information is generally recorded by the concave shape of the reflecting portions 61 and 62. It is necessary to stack a plurality of light guide plates. The cost increases when multiple light guide plates are required. In addition, a space for installing a plurality of light guide plates is required, which causes a problem that the equipment becomes large.

In order to solve this problem, Patent Document 1 describes a concave-shaped reflecting portion having a concave-shaped reflecting portion 65 having a gentle slope 63 and a steep slope 64 as shown in FIG. 17 (c). ing. The behavior of the incident light on the reflecting portion 65 will be described with reference to FIGS. 18A and 18B.

A reflecting portion 65 is formed on the bottom surface of the light guide plate 66 by notching a cross section or the like. The reflecting portion 65 is formed of a gentle slope 63 and a steep slope 64.

FIG. 18A shows the behavior when the light 67 is incident on the light guide plate 66 from the side where the steep slope 64 is located. The light 67 is refracted and transmitted on the steep slope 64 and the gentle slope 63, and propagates inside the light guide plate 66 again. As described above, the light incident from the steep slope 64 side is difficult to be emitted from the light guide plate 66.

FIG. 18B shows the behavior when the light 68 is incident on the light guide plate 66 from the side where the gentle slope 63 is located. The light 68 is totally reflected on the gentle slope 63 and emitted as light 69 from the upper surface of the light guide plate 66. As described above, the light incident on the gentle slope 63 side is likely to be emitted from the light guide plate 66.

Therefore, a display device in which two patterns "A" and "B" are recorded in one display area of the light guide plate by such a prism-shaped aggregate will be described with reference to FIGS. 19 and 20.

In FIG. 19A, a picture “A” represented by reference numeral 71 is recorded on a single light guide plate 66 by an aggregate of reflection portions 70, and a picture indicated by reference numeral 72 is recorded in the same display area as this picture “A”. “B” indicates a state recorded by the aggregate of the reflecting portions 73.

In the reflecting portion 70 composed of the gentle slope 63 and the steep slope 64, the gentle slope 63 faces the side surface 66a of the light guide plate 66. In the reflecting portion 73 composed of the gentle slope 63 and the steep slope 64, the gentle slope 63 faces the side surface 66b of the light guide plate 66.

Although two light guide plates 66 are shown side by side in FIG. 19 (a), they are actually one light guide plate 66, and as shown in FIG. 19 (b), a reference numeral is given to one display area of the light guide plate 66. Two patterns shown by 71 and 72 are recorded.

When the pattern "A" is displayed, substantially parallel light from the light source 74 is incident on the inside from the side surface 66a of the light guide plate 66 as shown in FIG. 20A. The light 75 from the light source 74 is reflected by the gentle slope 63 of each reflecting portion 70, so that the pattern "A" is displayed. The light 75 is incident on the steep slope 64 of the reflecting portion 73, but is refracted and transmitted by the gentle slope 63 of the reflecting portion 73, propagates again in the light guide plate 66, and the pattern “B” is not displayed.

When the pattern "B" is displayed, substantially parallel light from the light source 76 is incident on the inside of the light guide plate 66 from the side surface 66b as shown in FIG. 20 (b). The light 77 from the light source 76 is reflected by the gentle slope 63 of each reflecting portion 73, so that the pattern "B" is displayed. The light 77 is incident on the steep slope 64 of the reflecting portion 70, but is refracted and transmitted by the gentle slope 63 of the reflecting portion 70, and propagates again inside the light guide plate 66, so that the pattern “A” is not displayed.

In this way, by injecting light from the side surface 66a or 66b in the direction facing the light guide plate 66, the patterns "A" and "B" can be switched and displayed.

21 (a) and 21 (b) show a conventional display device in which the light incident directions are orthogonal to each other, not the opposite directions as shown in FIGS. 19 and 20. In this display device, the lengths of the sides are different. Also in this display device, as described with reference to FIG. 20, by changing the direction of the gentle slope 63 of the reflecting portion, the pattern to be displayed is switched according to the direction of the light entering the light guide plate 66. For example, the longitudinal directions of the two types of reflecting portions are arranged so as to be orthogonal to each other, and the directions of the light incident from the light source and the longitudinal directions of the two types of reflecting portions are orthogonal to each other. , 78 are placed. The pattern "A" indicated by reference numeral 71 is displayed by the light 75 shown in FIG. 21 (a), and as shown in FIG. 21 (b), the pattern indicated by reference numeral 80 is displayed by the light 79 in a direction substantially perpendicular to the light 75. "C" is displayed.

Japanese Unexamined Patent Publication No. 2006-75362

However, in the configuration of FIG. 20, when displaying the pattern “A” as shown in FIG. 22, a part of the light propagating inside the light guide plate 66 and reaching the side surface 66b is reflected by the side surface 66b and reflected. It is incident on the gentle slope 63 of 73. Therefore, there is a problem that the pattern "B" of the person who does not want to be displayed is displayed lightly while the pattern "A" is displayed. Further, when displaying the pattern "B", a part of the light propagating inside the light guide plate 66 and reaching the side surface 66a is reflected by the side surface 66a and incident on the gentle slope 63 of the reflecting portion 70. Therefore, there is a problem that the pattern "A" of the person who does not want to be displayed is displayed lightly while the pattern "B" is displayed.

FIG. 22 will be described in detail.

FIG. 22 shows the light guiding through the light guide plate 66 together with the cross section of the light guide plate 66. The light 75 guiding the light 75 while displaying the pattern “A” travels while repeating total reflection on the upper and lower surfaces of the light guide plate 66, and reaches the side surface 66b facing the incident side surface. On the side surface 66b, the light 75 is divided into light 75a that is refracted and transmitted and light 75b that is reflected by Fresnel.

As is widely known, the reflectance R when vertically incident on a material having a refractive index n0 to a refractive index n1 is represented by the following (Equation 1).

R = (n0-n1) 2 / (n0 + n1) 2 ... (Equation 1)
A transparent resin such as polycarbonate is generally used for the light guide plate. The refractive index of the transparent resin varies depending on the material, but in general, a transparent resin having a refractive index of around 1.5 is often used. From (Equation 1), the reflectance when light is incident on the air layer with a refractive index of 1.0 from a transparent resin with a refractive index of 1.5 is calculated.
R = (1.5-1.0) 2 / (1.5 + 1.0) 2 = 0.04
Therefore, about 4% of reflected light is generated. This reflected light becomes the incident light of the other pattern "B". As a result, an unnecessary pattern "B" is displayed.

As shown in FIGS. 21 (a) and 21 (b), the display device in which the light incident direction is orthogonal also has the following problems.

In this case, the shape of the side surface 66c where the light is incident from the light source 78 is deformed as shown by the solid line in FIG. 23 due to the so-called residual stress of processing such as molding at the time of manufacturing or the application of a force from the outside. May be done. When the shape of the light guide plate 66 is rectangular, the deformation due to molding or the like tends to be larger on the long side than on the short side. As a result, when the shape of the side surface 66c is deformed, the ratio of light entering the side surface 66c is partially reduced, and in the display state of the pattern "C", the pattern is partially thinned at a place where the amount of light entering is small. Phenomenon occurs. Specifically, the amount of emitted light in the portion parallel to the short side of the central portion of the long side of the light guide plate 66 is reduced. Alternatively, the amount of emitted light in the portion parallel to the short side of both ends of the long side is reduced.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a display device capable of beautifully displaying a desired pattern in a display device for switching and displaying a plurality of patterns.

In the display device of the present disclosure, the first side surface and the second side surface face each other, and the bottom surface and the top surface facing each other between the first side surface and the second side surface are formed, and the first side surface and the second side surface are formed. A light guide plate that propagates light incident on the inside from one of them toward the other, a first light source unit that incidents light on the first side surface of the light guide plate, and light incident on the second side surface of the light guide plate. The second light source unit is provided, and the light from the first light source unit incident on the light guide plate from the first side surface is reflected to the upper surface side by the first reflecting portion formed on the bottom surface of the light guide plate. The first pattern is displayed by emitting light to the outside of the light guide plate, and the light from the second light source unit incident on the light guide plate from the second side surface is formed on the bottom surface of the light guide plate. A display device that is reflected by a reflecting portion toward the upper surface side and emitted to the outside of the light guide plate to display a second pattern, and is a part of at least one of the first side surface and the second side surface of the light guide plate. It is characterized by having a slope on the surface.

In the display device of the present invention, a first side surface and a second side surface adjacent to the first side surface are orthogonal to each other, and a bottom surface and an upper surface facing each other are formed so as to form the first side surface and the second side surface. A light guide plate that propagates light incident on the inside from the first and second side surfaces, a first light source unit that transmits light on the first side surface in the lateral direction of the first and second side surfaces, and the above. A second light source unit that incidents light on the second side surface in the longitudinal direction of the first and second side surfaces is provided, and the light from the first light source unit that is incident on the light guide plate from the first side surface is transmitted. The first reflection portion formed on the bottom surface of the light guide plate reflects the light toward the upper surface side and emits the light to the outside of the light guide plate to display the first pattern, and the light source is incident on the light guide plate from the second side surface. A display device that displays the second pattern by reflecting the light from the second light source unit toward the upper surface side by the second reflecting portion formed on the bottom surface of the light guide plate and emitting it to the outside of the light guide plate. The thickness of the second side surface of the light guide plate is T, the length of the second light source unit in the thickness direction of the light guide plate is t_LS, and the thickness center of the second side surface of the light guide plate and the first 2. When the distance of the light source unit from the center of the length in the thickness direction of the light guide plate is Δc, T> t_LS> Δc is satisfied.

According to the display device of the present disclosure, a part of the light incident on the light guide plate from the first light source is reflected by the first reflecting portion formed on the light guide plate, and the first pattern is displayed on the upper surface of the light guide plate. A part of the light incident on the light guide plate from the first light source reaches the light entry surface facing the first light source of the light guide plate, but most of the light that reaches is due to the slope set on the opposite light input surface. It is reflected to the outside of the light guide plate. Therefore, the light that is reflected by the opposite reflecting surface and propagates through the light guide plate again is reduced. As a result, it is possible to suppress the phenomenon that an unnecessary second pattern is displayed.

According to the display device of the present invention, even if the light guide plate is deformed, the positional deviation between the light guide plate and the incoming light can be suppressed to be small. Therefore, even if the ratio of the light entering the light guide plate changes depending on the deformation location, it is possible to suppress the phenomenon that the intensity of the light propagating in the light guide plate differs depending on the light input location. As a result, it is possible to suppress the phenomenon that the emission intensity of the displayed pattern differs depending on the location, and to realize a beautiful display with uniform emission intensity.

A plan view of the display device of the first embodiment of the present disclosure (a) and a cross-sectional view of the display device of the first embodiment (b). The figure explaining the behavior of (a) (b) light in the light guide plate of Embodiment 1 Cross-sectional view of the light guide plate of the display device of the second embodiment of the same embodiment 1. Cross-sectional view of the light guide plate of the display device of the third embodiment of the same embodiment 1. (A) (b) (c) Separate cross-sectional views of the light guide plate of the display device of the fourth embodiment of the same embodiment 1. A perspective view showing another example of the light guide plate of the display device of the first embodiment of the same embodiment 1. A perspective view showing another example of the light guide plate of the display device of the second embodiment of the same embodiment 1. A perspective view showing another example of the light guide plate of the display device of the third embodiment of the same embodiment 1. A perspective view showing another example of the light guide plate of the display device of FIG. 5 (a) of the first embodiment. A perspective view showing another example of the light guide plate of the display device of FIG. 5 (b) of the first embodiment. A perspective view showing another example of the light guide plate of the display device of FIG. 5 (c) of the first embodiment. Top view of the display device according to the second embodiment of the present disclosure. (A) XX sectional view and (b) YY sectional view of the display device according to the second embodiment of the present disclosure. Top view of the embodiment of the display device of the present invention (A) XX sectional view and (b) YY sectional view of the embodiment of the display device of the present invention. The figure explaining the optimum condition of the light guide plate in embodiment of the display device of this invention. (A) (b) (c) A perspective view of a concave portion formed by reflecting a portion on a conventional light guide plate. (A) (b) Explanatory drawing of light behavior in a conventional light guide plate in which the concave shape is a prism shape. (A) An explanatory diagram of the operating principle of a light guide plate in which two patterns "A" and "B" are recorded in a display area by an aggregate of prism-shaped reflecting portions, and (b) an explanatory diagram of the display area state. (A) Explanatory drawing of the conventional example in which the pattern "A" is displayed in the display area and (b) Explanatory drawing of the conventional example in which the pattern "B" is displayed in the same display area. (A) (b) Diagram showing another conventional light guide plate A cross-sectional view showing a state of light reflection at the end face of the light guide plate described with reference to FIG. The figure which shows the deformation state of the light guide plate explained with FIG. 21

Hereinafter, embodiments of the present disclosure and the present invention will be described with reference to the drawings.

(Embodiment 1 of the present disclosure)
1 (a) (b), 2 (a) (b), and 3 to 11 show the first embodiment of the present disclosure.

FIG. 1A shows a front view of the display device of the present disclosure, and FIG. 1B shows a cross-sectional view taken along the line XX of FIG. 1A.

On the outer peripheral surface between the lower surface 2a and the upper surface 2b of the flat plate-shaped light guide plate 1, the lower ends of the first side surface 3 of the first side surface 3 and the second side surface 4 facing each other are connected to the outer periphery of the bottom surface 2a. It is composed of a first incident surface 3a that rises vertically and a first slope 3b that is located between the outer circumference of the upper surface 2b of the light guide plate 1 and the upper end of the first incident surface 3a and is inclined toward the inside of the light guide plate 1. There is. The first slope 3b is formed on the entire length direction of the first side surface 3.

The second side surface 4 is the same as the first side surface 3, and the lower end is connected to the outer circumference of the bottom surface 2a and rises vertically, the outer circumference of the upper surface 2b of the light guide plate 1 and the upper end of the second incident surface 4a. It is composed of a second slope 4b located between the light guide plates 1 and inclined toward the inside of the light guide plate 1. The second slope 4b is formed on the entire second side surface 4 in the length direction.

A large number of first reflecting portions 6 are engraved on the bottom surface 2a of the light guide plate 1 as recesses recessed inward so that the pattern 5 of "A" is displayed as a whole when viewed from the top surface 2b. Further, a large number of second reflecting portions 8 are engraved as recesses recessed inward so that the pattern 7 of "B" is displayed as a whole in the same display range as the pattern 5 when viewed from the upper surface 2b.

Light is incident on the first incident surface 3a of the light guide plate 1 from the first light source unit Ph1. The first light source unit Ph1 is composed of a light source 9 such as a light emitting diode and a lens 10. Light is incident on the second incident surface 4a of the light guide plate 1 from the second light source unit Ph2. The second light source unit Ph2 is composed of a light source 11 such as a light emitting diode and a lens 12. Lenses 10 and 12 are types of lenses that diffuse and emit light.

The first and second reflecting portions 6 and 8 have a gentle slope 63 and a steep slope 64 as shown in FIG. 17 (c). The first reflecting portion 6 has a gentle slope 63 formed toward the first incident surface 3a so as to reflect the light incident from the first light source unit Ph1 and emit it from the upper surface 2b. The second reflecting portion 8 has a gentle slope 63 formed toward the second incident surface 4a so as to reflect the light incident from the second light source unit Ph2 and emit it from the upper surface 2b.

The behavior of light in this display device will be described with reference to FIGS. 2A and 2B.

As an example, here, the behavior of light when only the first light source unit Ph1 of the first and second light source units Ph1 and Ph2 is turned on will be described.

The light emitted from the first light source unit Ph1 is incident on the light guide plate 1 from the first incident surface 3a on the first side surface 3. As shown in FIG. 2A, the incident light travels through the light guide plate 1 while being totally reflected inside the light guide plate 1. Then, while propagating through the light guide plate 1, it is reflected by the first reflecting unit 6 to emit light from the light guide plate 1. The set of light reflected by the first reflecting unit 6 and reflected upward by the light guide plate 1 displays the pattern 5 "A" as a whole.

Further, in the light traveling through the light guide plate 1, there is a component that reaches the second side surface 4 without being reflected by the first reflecting unit 6. As shown in FIG. 2B, the light corresponding to the second slope 4b of the second side surface 4 is reflected and emitted to the outside from the bottom surface 2a of the light guide plate 1. Therefore, it is possible to reduce the components that are reflected on the second side surface 4 on the side opposite to the first light source unit Ph1 and propagate back in the light guide plate 1.

The light incident on the second incident surface 4a from the second light source unit Ph2 travels through the light guide body 1 while being totally reflected in the light guide plate 1. Then, the set of light reflected upward by the second reflecting unit 8 and reflected upward by the light guide plate 1 displays the pattern 7 of "B" as a whole.

Further, in the light traveling through the light guide plate 1, there is a component that reaches the first side surface 3 without being reflected by the second reflecting unit 8. The light corresponding to the first slope 3b of the first side surface 3 is reflected and emitted to the outside from the bottom surface 2a of the light guide plate 1. Therefore, it is possible to reduce the components that are reflected on the first side surface 3 opposite to the second light source unit Ph2 and propagate back in the light guide plate 1.

The first and second slopes 3b and 4b were all formed in the entire length direction of the first and second side surfaces 3 and 4, but one of the first and second side surfaces 3 and 4 in the length direction. Even if it is formed on the portion, the effect of suppressing the reflected return light can be obtained.

The larger the regions of the first slope 3b and the second slope 4b, the more unnecessary light returning from the side surface opposite to the incident surface can be suppressed. However, if the regions of the first slope 3b and the second slope 4b are too large, the areas of the first incident surface 3a and the second incident surface 4a for entering light become small, so that the efficiency of entering light becomes low, or Even if the light enters the light guide plate 1, it is blocked by the reflecting portion closer to the incident surface, and it becomes difficult to guide the light in the light guide plate. In order to suppress this and propagate the light in the light guide plate while suppressing the reflected return light, it is desirable to satisfy the following equation (1).

The length of the entire side surface of the light guide plate 1 (thickness of the side surface parallel to the normal line of the exit surface) is T, and the length of the regions of the first and second slopes 3b and 4b (in the direction parallel to the normal line of the exit surface). The length of the first and second incident surfaces 3a and 4a (not the side slope in the direction parallel to the normal of the exit surface) of the so-called non-slope portion obtained by subtracting t0 from t0 and T (the length of the slope). Let t1 be the length of the portion) and h be the average height of the first and second reflecting portions 6 and 8.
T ＞ t1 ＞ h ・ ・ ・ ・ Equation (1)
Is desirable.

The first and second slopes 3b and 4b were installed on the side opposite to the surface on which the first and second reflecting portions 6 and 8 were formed, but as shown in FIG. 3, the first and second reflecting portions were installed. The same effect can be obtained by installing it on the same side as the surface on which 6 and 8 are formed. In this case, the light reflected by the first and second slopes 3b and 4b is emitted from the upper surface 2b of the light guide plate 1, but it may be shielded by the light shielding plate 13 provided on the upper surface 2b.

Further, as shown in FIG. 4, the position where the slope is formed may be configured on the same side and the opposite side with respect to the surface on which the reflection portion is formed. In the case of FIG. 4, it is desirable to satisfy the following equation (2).

The length of the region of the first slope 3b on the same side as the surface on which the first and second reflecting portions 6 and 8 are formed is t0R, and the thickness of the light guide plate 1 is T minus t0R. Let t1R be the length of, and h be the average height of the first reflecting portion 6 or the second reflecting portion 8 forming the pattern to be displayed on the light guide plate 1.
T ＞ t1R ＞ h ・ ・ ・ ・ Equation (2)
Is desirable. Here, the length of the region of the second slope 4b is also t0R.

Further, in each of the above embodiments, the first side surface 3 has one first slope 3b and the second side surface 4 has one second slope 4b, but a plurality of slopes may be provided on one side surface. Specifically, even if the configuration is as shown in FIGS. 5A, 5B, and 5C, the effect of suppressing the reflected return light can be obtained.

In FIG. 5A, a slope inclined in a direction extending from the lower end of the first incident surface 3a to the outside of the light guide plate 1 on the side of the bottom surface 2a of the light guide plate 1 with the first incident surface 3a sandwiched by the first side surface 3. A slope 3b2 inclined in a direction extending from the upper end of the first incident surface 3a to the outside of the light guide plate 1 is formed on the side of 3b1 and the upper surface 2b of the light guide plate 1, and is guided by sandwiching the second incident surface 4a on the second side surface 4. A slope 4b1 inclined in a direction extending from the lower end of the second incident surface 4a to the outside of the light guide plate 1 on the bottom surface 2a side of the light plate 1, and a light guide plate 1 from the upper end of the second incident surface 4a on the upper surface 2b side of the light guide plate 1. A slope 4b2 is formed that is inclined in the direction of spreading outward.

In FIG. 5B, a slope inclined in a direction extending from the lower end of the first incident surface 3a to the outside of the light guide plate 1 on the side of the bottom surface 2a of the light guide plate 1 with the first incident surface 3a sandwiched by the first side surface 3. A slope 3b2 inclined from the upper end of the first incident surface 3a toward the inside of the light guide plate 1 is formed on the side of 3b1 and the upper surface 2b of the light guide plate 1, and the light guide plate is sandwiched between the second incident surface 4a on the second side surface 4. A slope 4b1 inclined in a direction extending from the lower end of the second incident surface 4a to the outside of the light guide plate 1 on the side of the bottom surface 2a of 1, and the light guide plate 1 from the upper end of the second incident surface 4a on the side of the upper surface 2b of the light guide plate 1. A slope 4a2 inclined inward is formed.

In FIG. 5 (c), a slope inclined in a direction extending from the lower end of the first incident surface 3a to the outside of the light guide plate 1 on the side of the bottom surface 2a of the light guide plate 1 with the first incident surface 3a on the first side surface 3. A slope 3b2 inclined from the upper end of the first incident surface 3a toward the inside of the light guide plate 1 is formed on the side of 3b1 and the upper surface 2b of the light guide plate 1, and the light guide plate is sandwiched between the second incident surface 4a on the second side surface 4. A slope 4b1 inclined inward from the lower end of the second incident surface 4a on the bottom surface 2a side of 1, and a direction extending from the upper end of the second incident surface 4a to the outside of the light guide plate 1 on the upper surface 2b side of the light guide plate 1. An inclined slope 4b2 is formed.

In addition, in FIGS. 1A and 1B, the light guide plate 1 is flat and the directions of the surfaces of the first, second side surfaces 3 and 4 intersect with the upper surface 2b which is the exit surface of the light guide plate 1. However, the light guide plate 1 may be flat and the directions of the upper surface 2b of the light guide plate 1 and the surfaces of the first and second side surfaces 3 and 4 may be parallel to each other. Specifically, the shape of the light guide plate 1 is configured as shown in FIG. 6, for example.

In the light guide plate 1 of FIG. 6, curved light introduction paths 1b and 1c are integrally formed with a part of a flat plate-shaped light guide plate main body 1a in which the first and second reflecting portions 6 and 8 are formed on the bottom surface 2a. It is formed. The light is incident on the end faces 14a and 14b of the light introduction paths 1b and 1c and is incident on the light guide plate main body 1a via the light introduction paths 1b and 1c. By the light introduction paths 1b and 1c, the directions of the first and second incident surfaces 3a and 4a can be changed so as to be parallel to the direction of the upper surface 2b of the light guide plate main body 1a, and the upper surface 2b of the light guide plate 1 can be changed. Light can enter from below or above, which is the normal direction.

Here, the light introduction paths 1b and 1c are provided so that the directions of the first and second incident surfaces 3a and 4a are both parallel to the direction of the upper surface 2b of the light guide plate main body 1a, but the light introduction path 1b or Only one of the light introduction paths 1c may be provided in the light guide plate main body 1a.

The same applies to the examples of FIGS. 3, 4, 5 (a), (b), and (c), and as shown in FIGS. 7, 8, 9, 10, and 11, at least the light guide plate main body 1a. By integrally molding the light introduction paths 1b and 1c in a part thereof, the directions of the upper surface 2b of the light guide plate 1 and the surfaces of the first, second side surfaces 3 and 4 can be formed in parallel.

Further, in the embodiment shown in FIGS. 1A and 1B, the first slope 3b is formed on the entire length direction of the first side surface 3, and the second slope is formed on the entire length direction of the second side surface 4. Although 4b was formed, the effect of partially suppressing the reflected return light can be obtained only by providing the first slope 3b or the second slope 4b. Further, even if the first and second slopes 3b and 4b are provided only in a part of the first and second side surfaces 3 and 4 in the length direction, the effect of partially suppressing the reflected return light can be obtained. Further, when the first slope 3b is provided on a part of the first side surface 3 in the length direction and the second slope 4b is not provided on the second side surface 4, or a part of the second side surface 4 in the length direction is provided. Even when the two slopes 4b are provided and the first slope 3b is not provided on the first side surface 3, the effect of partially suppressing the reflected return light can be obtained. This also applies to the other examples of the first embodiment of the present disclosure.

Although the cases of the first, second side surfaces 3 and 4 in the lateral direction of the facing side surfaces of the light guide plate 1 have been described, the longitudinal direction of the facing side surfaces of the light guide plate 1 shown in FIG. 1 has been described. The same applies when the first and second reflecting portions 6 and 8 are provided so as to display the pattern 5 or 7 by incident light from the side surface.

(Embodiment 2 of the present disclosure)
12 and 13 (a) and 13 (b) show the second embodiment of the present disclosure.

12A and 12B show a front view of the display device according to the second embodiment of the present disclosure, FIG. 13A is a sectional view taken along the line XX of FIG. 12, and FIG. 13B is a sectional view taken along the line YY of FIG. Shown. In the first embodiment of the present disclosure, the pattern 5 of "A" or the pattern 7 of "B" is formed by selectively injecting light onto the first, second side surfaces 3 and 4 of the light guide plate 1 facing each other. In the second embodiment of the present disclosure, not only the switching display of "A" or "B" but also the third and fourth side surfaces 23 and 24 of the light guide plate 1 facing each other are displayed by switching. The pattern of "C" or the pattern of "D" is switched and displayed by selectively injecting light into the image.

The first, second side surfaces 3, 4 and the first, second reflecting portions 6, 8 and the first and second light source units Ph1 and Ph2 on the first, second side surfaces 3 and 4 of the light guide plate 1 are the same as those in FIG. Is.

The third light source unit Ph3 is composed of a light source 29 such as a light emitting diode and a lens 30. The fourth light source unit Ph4 is composed of a light source 31 such as a light emitting diode and a lens 32. The lenses 30 and 32 are lenses of the type that diffuse and emit light.

On the outer peripheral surface between the bottom surface 2a and the upper surface 2b of the flat plate-shaped light guide plate 1, the lower ends of the third side surface 23 and the third side surface 23 of the fourth side surface 24 facing each other are connected to the outer periphery of the bottom surface 2a. It is composed of a third incident surface 23a that rises vertically and a third slope 23b that is located between the outer circumference of the upper surface 2b of the light guide plate 1 and the upper end of the third incident surface 23a and is inclined toward the inside of the light guide plate 1. There is. The third slope 23b is formed on the entire length direction (X direction) of the third side surface 23.

The fourth side surface 24 is the same as the third side surface 23, and the lower end is connected to the outer circumference of the bottom surface 2a and rises vertically, the outer circumference of the upper surface 2b of the light guide plate 1 and the upper end of the fourth incident surface 24a. It is composed of a fourth slope 24b located between the light guide plates 1 and inclined toward the inside of the light guide plate 1. The fourth slope 24b is formed on the entire length direction (X direction) of the fourth side surface 24.

Third and fourth reflecting portions 26 and 28 are formed on the bottom surface 2a of the light guide plate 1. The third reflecting unit 26 is formed so as to display the pattern 25 of “C” by the light incident on the third incident surface 23a from the third light source unit Ph3. The second reflecting portion 28 is formed so as to display the pattern 27 of “D” by the light incident on the fourth incident surface 24a from the fourth light source unit Ph4.

A semi-transparent plate 41 with a switch function, such as an electrostatic sensor, is installed above the light guide plate 1. The translucent plate 41 in this specification is a sheet or a plate material. The translucent plate 41 is illustrated by a virtual line in FIG. 13 (a) and 13 (b) are shown by solid lines. The semi-transparent plate 41 is a half mirror having a transmittance of about 1 to 70% or a colored light transmitting plate such as black, and is shown in the operation areas 42a, 42b, 42c, and 42d of the switch function in FIG.

The switching circuit 43 detects the detected signal 44a in which the operation area 42a is operated, turns on the energization of the first light source 9, and turns off the energization of the second, third, and fourth light sources 11, 29, and 31. .. The operation area 42b detects the operated detection signal 44b, turns on the energization of the second light source 11, and turns off the energization of the first, third, and fourth light sources 9, 29, and 31. The operation area 42c detects the operated detection signal 44c to turn on the energization of the third light source 29, and turns off the energization of the first, second, and fourth light sources 9, 11, and 31. The operation area 42d detects the operated detection signal 44d, turns on the energization of the fourth light source 31, and turns off the energization of the first, second, and third light sources 9, 11, and 29.

Since the third and fourth slopes 23b and 24b are formed on the light guide plate 1 in this way, the effect of suppressing the reflected return light can be obtained as in the case of the first and second slopes 3b and 4b.

Further, due to the presence of the translucent plate 41, when none of the first, second, third, and fourth light sources 9, 11, 29, and 31 is lit, light from the outside around the light guide plate is emitted. Since the translucent plate 41 reflects the light, the existence of the light guide plate 1 can be hidden.

The light guide plate 1 has a length in the XX direction longer than a length in the YY direction. At this time, the size of the regions of the first and second slopes 3b and 4b in the longitudinal direction (X direction) of the light guide plate 1 and the regions of the third and fourth slopes 23b and 24b in the lateral direction (Y direction). There are optimum conditions for the size of the above from the following points.

When any of the operation areas 42a, 42b, 42c, and 42d is pressed, the semi-transparent plate 41 is deformed, and the light guide plate 1 is pressed and deformed via the semi-transparent plate 41. The deformation of the light guide plate 1 is relatively large in the longitudinal direction. Further, the deformation of the light guide plate 1 due to distortion or the like during molding is generally larger in the longitudinal direction than in the lateral direction. From these, it is preferable that the light guide plate 1 has a high mechanical strength in the longitudinal direction. Therefore, it is desirable to satisfy the following equation (3).

As shown in FIGS. 13A and 13B, t1_short obtained by subtracting the heights t0 of the first and second slopes 3b and 4b from the thickness T of the light guide plate 1 and the third and third thicknesses T of the light guide plate 1 The t1_long obtained by subtracting the heights t0 of the four slopes 23b and 24b is
t1_short <t1_long ... Equation (3)
Is established. By setting in this way, the mechanical strength of the light guide plate 1 in the longitudinal direction can be increased and deformation can be suppressed, so that the emitted light of the portion parallel to the short side of the central portion of the long side is reduced, or It is possible to suppress a phenomenon in which the amount of emitted light in a portion parallel to the short side of both ends of the long side is reduced.

In the above description of the second embodiment of the present disclosure, a modification of FIG. 1 according to the first embodiment of the present disclosure has been described as an example, but FIGS. 3, 4, 5 (a), 5 (b) ( c), the same applies to the cases of FIGS. 6 to 11.

Further, in the second embodiment of the present disclosure, the first, second, third, and fourth slopes 3b, 4b, 23b, and 24b are provided on the entire side surface of the light guide plate 1 in the length direction, but some of them are provided. Even if there is, the effect of suppressing the reflected return light can be obtained.

Further, although a plate with a switch function is used as the semi-transparent plate 41, it is preferable that the semi-transparent plate without the switch function also satisfies the formula (3) due to the magnitude of deformation during molding of the light guide plate.

(Embodiment of the present invention)
14 shows a front view of the display device according to the embodiment of the present invention, FIG. 15A shows a sectional view taken along the line XX of FIG. 14, and FIG. 15B shows a sectional view taken along the line YY of FIG. ..

The first embodiment of the present disclosure is the light guide plate 1 of the first side surface 3 and the second side surface 4 facing each other, but the light guide plate 51 of the embodiment of the present invention is the first from the first light source unit Ph1. Light is incident on the side surface 3, and when adjacent to the first side surface 3, light is incident on the second side surface 23 from the second light source unit Ph2. The first side surface 3 and the second side surface 4 of the light guide plate 1 are orthogonal to each other.

The first light source unit Ph1 is composed of a light source 9 such as a light emitting diode and a lens 10. The second light source unit Ph2 is composed of a light source 11 such as a light emitting diode and a lens 12. Lenses 10 and 12 are types of lenses that diffuse and emit light.

A large number of first reflecting portions 6 are engraved on the bottom surface 2a of the light guide plate 51 as recesses recessed inward so that the pattern 5 of "A" is displayed as a whole when viewed from the top surface 2b. Further, a large number of second reflecting portions 8 are engraved as recesses recessed inward so that the pattern 25 of "C" is displayed as a whole in the same display range as the pattern 5 when viewed from the upper surface 2b.

A translucent plate 41 with a switch function such as an electrostatic sensor is installed on the upper surface of the light guide plate 51. The translucent plate 41 has a transmittance of about 1 to 70%, and is a half mirror or a colored light transmitting plate such as black.

Due to the presence of the semi-transparent plate 41 with a switch function, when neither the first or second light source units Ph1 and Ph2 are lit, the light from the outside of the light guide plate is reflected by the translucent plate 41. , The presence of the light guide plate 51 can be hidden. By lighting any of the first and second light source units Ph1 and Ph2, any of the patterns 5 and 25 corresponding to the light source is displayed and displayed through the translucent plate 41. This display device can be used as a switch for switching the pattern by the combination of the switching circuit 43 and the translucent plate 41 described in the second embodiment of the present disclosure.

FIG. 16 is a view of the second side surface 23 of FIG. 14 as viewed from the viewpoint A (arrow), and is a diagram for explaining appropriate conditions for the thickness of the light guide plate 51 and the size and position of the light source. It is assumed that the length of the cross section XX of the light guide plate 51 is longer than the length of the cross section YY.

Assuming that the translucent plate 41 is pushed as a switch, the deformation in the longitudinal direction becomes relatively large. Further, the deformation of the light guide plate 51 due to distortion or the like during molding is generally larger in the longitudinal direction than in the lateral direction. From these, it is highly possible that the light guide plate 51 is displaced from the position of the light receiving portion of the second light source unit Ph2 and the light guide plate 51 on the side in the longitudinal direction. Considering this, it is desirable to satisfy the following equation (4).

Assuming that the thickness of the light guide plate 51 is T, the dimension of the second light source unit Ph2 in the thickness direction is t_LS, and the amount of deviation between the center of the light source plate and the center of the second light source unit Ph2 is Δc.
T>t_LS> Δc ・ ・ ・ ・ Equation (4)
Meet. By satisfying this, even if the translucent plate 41 is pressed and the light guide plate 51 is deformed in the longitudinal direction, the efficiency with which the light from the second light source unit Ph2 enters the light guide plate 51 is partially reduced. This can be suppressed, and the phenomenon that the emitted light in the portion parallel to the short side in the center of the long side is reduced or the emitted light in the portion parallel to the short side at both ends of the long side is reduced can be suppressed. it can.

Considering that the light guide plate 51 is pushed in the normal direction of the light emitting surface, the center of the second light source unit Ph2 is the upper surface 2b which is the exit surface where the translucent plate 41 is located with respect to the center of the light guide plate 51. Is preferably deviated in the direction of the bottom surface 2a in the opposite direction.

In the embodiment of the present invention, the light guide plate 51 is a flat plate, and light is introduced from the first light source unit Ph1 facing the first side surface 3, which is shown in FIG. 6 of the first embodiment of the present disclosure. As described above, the curved light introduction path 1b may be integrally formed with the light guide plate 51, and the portion through which the light enters the light guide plate 51 may be bent so that the light enters from below or above. ..

Further, although a plate having a switch function is used as the translucent plate 41, it is preferable that the semitransparent plate having no switch function also satisfies the formula (4).

(Embodiment 3 of the present disclosure)
The light guide plate 51 according to the second embodiment of the present disclosure shown in FIG. 12 has a rectangular shape long in the cross section XX direction, and a curved light introduction path 1b like the curved light introduction path 1b seen in FIG. When light is directly incident on the third incident surface 23a of the third side surface 23 of the light guide plate 51 from the third light source unit Ph3 without passing through a path, or when light is incident on the fourth incident surface 24a of the fourth side surface 24 of the light guide plate 51. When light is incident directly from the fourth light source unit Ph4, the light guide plate 51 is displaced between the third light source unit Ph3 and the third side surface 23 of the light guide plate 51 in the longitudinal direction, and the fourth light source unit. There is a high possibility that the Ph4 and the fourth side surface 23 of the light guide plate 51 will be misaligned. Considering this, it is very effective to set so as to satisfy the equation (4) of the embodiment of the present invention in this case as well.

The present invention contributes to improving the quality of display in a game machine such as a pachinko machine or a pachislot machine, a display device embedded in various other devices, or a display device used alone.

1 Light guide plate 2a Bottom surface 2b Top surface 3 First side surface 4 Second side surface 3a First incident surface 3b First slope 4a Second incident surface 4b Second slope 5 Picture 6 First reflecting part 8 Second reflecting part Ph1 First light source unit Ph2 2nd light source unit 9 Light source 10 Lens 11 Light source 12 Lens 3b1 Slope 3b2 Slope 4b1 Slope 4b2 Slope 23 3rd side surface 24 4th side surface 23a 3rd incident surface 23b 3rd slope 24a 4th incident surface 24b 4th slope 26 3rd Reflector 28 4th reflector 25 Picture 27 Picture Ph3 3rd light source unit Ph4 4th light source unit 29 Light source 30 Lens 31 Light source 32 Lens 41 Semi-transparent plate 42a, 42b, 42c, 42d Operation area 43 Switching circuits 44a, 44b, 44c , 44d Detection signal 51 Light guide plate T Thickness of light guide plate 1 t_LS Length of light guide plate of second light source unit in the thickness direction t0R Length of region of first slope 3b t1R Length of first incident surface 3a h Reflection Average height of the part

Claims (5)

The first side surface and the second side surface adjacent to the first side surface are orthogonal to each other, and the bottom surface and the upper surface facing each other are formed so as to form the first side surface and the second side surface, and the first and second side surfaces are formed. A light guide plate that propagates light incident from the side to the inside,
A first light source unit that incidents light on the first side surface in the lateral direction of the first and second side surfaces, and
A second light source unit for incident light is provided on the second side surface in the longitudinal direction of the first and second side surfaces.
The light from the first light source unit incident on the light guide plate from the first side surface is reflected to the upper surface side by the first reflecting portion formed on the bottom surface of the light guide plate to the outside of the light guide plate. The first pattern is displayed by emitting light, and the light from the second light source unit incident on the light guide plate from the second side surface is directed to the upper surface side by the second reflecting portion formed on the bottom surface of the light guide plate. It is a display device that displays a second pattern by reflecting it on the light source and emitting it to the outside of the light guide plate.
Let T be the thickness of the second side surface of the light guide plate.
Let t_LS be the length of the second light source unit in the thickness direction of the light guide plate.
When the distance between the thickness center of the second side surface of the light guide plate and the center of the length of the second light source unit in the thickness direction of the light guide plate is Δc.
T ＞ t_LS ＞ △ c
A display device characterized by satisfying. The first aspect of claim 1, wherein the center of the second light source unit is deviated from the center of the length of the light guide plate in the thickness direction by a distance Δc in the direction opposite to the exit surface of the light guide plate. Display device. It is characterized in that light from the first light source unit is input to the inside of the light guide body through a light introduction path having a curved surface portion at least on the first side surface of the light guide plate.
The display device according to claim 1. The display device according to claim 1, wherein a translucent plate having light transmission is installed on the upper surface side of the light guide plate. The display device according to claim 4, wherein the translucent plate has a switch function.

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