TWI643164B - Light guiding device for an electronic signage - Google Patents

Abstract

A light guiding device for an electronic kanban, wherein light emitted by a plurality of illuminating elements of the electronic kanban passes, and comprises a flat plate, a plurality of light guiding units respectively corresponding to the illuminating elements, and a sunlight reflecting layer. The flat plate has a light incident end surface adjacent to the light emitting elements and a light emitting end surface opposite to the light incident end surface. The sunlight reflecting layer is connected to the light emitting end surface of the flat plate and shields the light emitting end surface in such a manner that the light guiding unit is exposed and has a plurality of first reflecting surfaces and a plurality of second reflecting surfaces extending upward from the light emitting end surface. The sunlight from the oblique upper side is reflected by the first reflecting surface and the second reflecting surface. For each light guiding unit, the light emitted by the corresponding light-emitting element is concentrated by the light guiding unit and is inclined downward.

Description

Light guiding device for an electronic signage

The present invention relates to a light guiding device, and more particularly to a light guiding device for an electronic kanban.

Referring to FIG. 1, a conventional electronic kanban 9 for a road has a checkerboard array formed by a plurality of light-emitting modules (not shown), and the electronic kanban 9 is projected by illuminating a specific position of the light-emitting module. The light that constitutes a particular figure or text is for viewing by the pedestrian 91 for promotional purposes.

Such an electronic kanban 9 is mostly placed at a high place and is not easily shielded. However, in this case, the pedestrian 91 viewing the electronic kanban 9 is at a position lower than the electronic kanban 9 and projected from the electronic kanban 9. The light is projected in all directions, only the downward part is seen by the pedestrian, and there is a disadvantage of poor energy use efficiency and the text or figure displayed by the electronic signboard 9 is not easily recognized. In addition, the reflection caused by sunlight shining onto the electronic board 9 interferes with the pedestrian 91, making the text or figure displayed by the electronic board 9 less recognizable.

Therefore, the existing electronic signboard 9 still has room for improvement.

Therefore, it is an object of the present invention to provide a light guiding device for an electronic kanban for the light source provided on an electronic kanban and for a light emitting module to pass through, thereby overcoming the above A drawback of the prior art.

Accordingly, it is an object of the present invention to provide a light guiding device for an electronic kanban for the passage of light generated by a plurality of illuminating elements of the electronic kanban, the light guiding device for an electronic kanban comprising a flat plate, a plurality of light guiding units and a sunlight reflecting layer. The flat plate has a light incident end surface adjacent to the light emitting units and a light emitting end surface opposite to the light incident end surface. The light guiding units are formed on the flat plate, and each of the light guiding units corresponds to one of the light emitting elements and has a first light guiding portion exposed to the light incident end surface and a second light guide exposed to the light emitting end surface Light department. The sunlight reflecting layer shields the light emitting end surface of the flat plate in such a manner that each second light guiding portion is exposed, and is in a zigzag shape and has a plurality of first reflecting surfaces extending upward from the light emitting end surface and a plurality of And a second reflecting surface that is connected to the first reflecting surface and extends horizontally, so that the sunlight from the oblique upper surface is reflected by the first reflecting surface and the second reflecting surface. a state in which the light emitted by the light-emitting element corresponding to the light-guiding unit enters the light guiding unit via the first light guiding portion and the light guiding unit is emitted through the second light guiding portion for each light guiding unit Then, the light is refracted by the first light guiding portion and is refracted into a parallel light beam toward the second light guiding portion, so that the light is inclined downward after being refracted by the second light guiding portion.

In some embodiments, each light guiding unit is a light guiding lens, and has a light incident surface spaced apart from the light emitting element and incident on the light incident surface and a light incident surface opposite to the light incident surface. a light-emitting surface portion, wherein the first light guiding portion is a Fresnel lens structure formed on the light-incident surface portion, and the second light guiding portion includes a plurality of strip-shaped flaws that are laterally extended from the top to the bottom and juxtaposed on the light-emitting surface portion unit. The light incident surface of the light guiding unit is located at a light incident end surface of the flat plate, and the light emitting surface portions of the light guiding unit are located at a second end surface of the flat plate opposite to the light incident end surface, each strip shape稜鏡 The portion has an inclined refractive surface extending downward from the light incident surface. a state in which the light emitted by the light-emitting element corresponding to the light-guiding unit enters the light guiding unit via the first light guiding portion and the light guiding unit is emitted through the second light guiding portion for each light guiding unit Then, the light is condensed after being refracted by the first light guiding portion and faces the second light guiding portion, so that the light is inclined downward after being refracted by the inclined refracting surfaces.

In some embodiments, the light-incident surface is recessed toward the light-emitting surface portion to form a receiving groove for receiving the light-emitting element, and the Fresnel lens structure is located at the bottom of the receiving groove.

In some embodiments, each of the oblique refractive surfaces has an angle with the horizontal mask, the included angle being between 40° and 85°.

In some embodiments, the angles of the inclined refracting surfaces and the horizontal plane are not identical to each other, and the optical path of the portion of the ray that passes downward through the inclined refracting surface is opposite to a horizontal plane passing through the illuminating element. The angle is between 5 degrees up to 35 degrees down.

In some embodiments, the light guiding device for an electronic kanban further includes a sunlight reflecting layer connected to the flat plate.

In some embodiments, each reflective surface has an angle with the horizontal mask that is between 38.66° and 56.98°.

In some embodiments, the angles of the reflecting surfaces and the horizontal plane are not identical to each other.

In some embodiments, the light guiding device for an electronic kanban further comprises a plurality of sunshades connected to the sunlight reflecting layer in the same number as the light guiding units, each sunshade being located The upper edge of one of the light guiding units.

The present invention has at least the following effects: the light emitted by each of the light-emitting elements converges at the light guiding unit and is inclined downward, and thus, the light projected from the electronic kanban can be guided to be mainly projected forward. Most of them can be seen by pedestrians. In addition, the sunlight reflecting layer can reflect the sunlight from the oblique upwards without disturbing the pedestrians, and can effectively utilize the energy and make the characters or symbols displayed on the electronic billboard easy to be recognized.

1‧‧‧Light guide

10‧‧‧ tablet

101‧‧‧Incoming light end face

102‧‧‧Lighting end face

11‧‧‧Lighting unit

111‧‧‧ light face

112‧‧‧Lighting face

113‧‧‧Fresnel lens structure

113a‧‧‧稜鏡

114‧‧‧Articles

114a‧‧‧ oblique refractive surface

115‧‧‧ Reception trough

12‧‧‧Sunlight Reflective Layer

121‧‧‧reflecting surface

13‧‧‧ sunshade

9,9’‧‧‧Electronic board

91‧‧‧Pedestrians

93‧‧‧Lighting elements

931‧‧‧ horizontal plane

θ ₁ ‧‧‧ angle

θ ₂ ‧‧‧ angle

θ ₃ ‧‧‧ angle

θ ₄ ‧‧‧ angle

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a schematic diagram illustrating a conventional electronic sign; FIG. 2 is a perspective view illustrating the present invention for use in an electronic signage An embodiment of a light guiding device of the device; FIG. 3 is an exploded perspective view illustrating the embodiment; FIG. 4 is a rear view illustrating a plurality of light guiding units of the embodiment, and omitting a sunlight reflecting layer and Figure 5 is a partial cross-sectional view taken along line VV of Figure 4, illustrating a plurality of light guiding units of the embodiment; Figure 6 is a partial enlarged view of Figure 5 illustrating the light guiding unit; Figure 7 is one side FIG. 8 is a partial enlarged view of FIG. 7 illustrating the solar reflective layer of the embodiment; FIG. 9 is a partial enlarged view of FIG. 5 illustrating light passing through a light-emitting element through the light guiding unit; Figure 10 is a schematic view showing that a plurality of the embodiments are spliced to each other in an electronic kanban such that the light emitted by the electronic kanban is inclined downward.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 2 to FIG. 4, an embodiment of the light guiding device 1 for an electronic kanban includes a flat panel 10, a plurality of light guiding units 11 formed on the flat panel 10 in a checkerboard array, and a connection The sunlight reflecting layer 12 of the flat panel 10 and a plurality of sunshades 13 connected to the solar reflecting layer 12 in the same number as the light guiding units 11 are provided. Each sunshade cover 13 is located at an upper edge of one of the light guiding units 11 to effectively shield sunlight from the upper side. The flat plate 10 has a light incident end surface 101 and a light exit end surface 102 opposite to the light incident end surface 101 (see FIG. 4).

Referring to FIG. 5, each light guiding unit 11 has a light incident surface portion 111 for receiving light, a light emitting surface portion 112 opposite to the light incident surface portion 111 for emitting the light, and a first exposed light receiving end surface 101. a light guiding portion and a second light guiding portion exposed on the light emitting end surface 102. The light incident surface portions 111 of the light guiding units 11 are located on the light incident end surface 101, and the light emitting surface portions 112 of the light guiding units 11 and the sunlight reflecting layer 12 (see FIG. 3) are located on the flat plate 10 The light exit end surface 102.

Referring to FIG. 6, in the present embodiment, the structure of each light guiding unit 11 is the same, so only one of the light guiding units 11 will be described below. In the light guiding unit 11, the first light guiding portion is a Fresnel lens structure 113 formed on the light incident surface portion 111, and has a plurality of concentric circles 113a. The light-incident surface portion 111 is recessed toward the light-emitting surface portion 112 and defines a receiving groove 115 for receiving a corresponding light-emitting element (not shown). The Fresnel lens structure 113 is located at the bottom of the receiving groove 115. The second light guiding portion includes a plurality of strip-shaped crotch portions 114 that are laterally extended from the top to the bottom and juxtaposed on the light-emitting surface portion 112. Each of the crotch portions 114 has an inclined refractive surface 114a extending downward from the light incident surface portion 111. The inclined refractive surface 114a of each of the strips 114 has an angle θ ₁ (θ ₂ ) with the horizontal mask, and in the embodiment, the angle θ ₁ (θ ₂ ) is between 40° and 85°, and Not limited to this. In the present embodiment, the angles θ ₁ , θ _{2 of the} inclined refracting surfaces 114 a and the horizontal plane are not identical to each other, for example, the angle between one of the inclined refracting surfaces 114 a of FIG. 6 and the horizontal plane. θ ₁ is significantly larger than the angle θ ₂ between the other oblique refractive surface 114a and the horizontal plane. In detail, the value of the angle between the inclined refractive surface 114a and the horizontal plane is 40 degrees, 53 degrees, 73 degrees, 45 degrees, 50 degrees, 80 degrees, 80 degrees, 80 degrees, 85 degrees, 82 degrees from top to bottom. , 60 degrees, 70 degrees, and 65 degrees.

Referring to FIG. 2, FIG. 7, and FIG. 8, the sunlight reflecting layer 12 shields the light-emitting end surface 102 of the flat plate 10 in such a manner that each second light guiding portion (ie, the strip-shaped crotch portions 114) is exposed. a plurality of first reflective surfaces 121 extending upwardly away from the light-emitting end surface 102 and a plurality of second reflective surfaces 122 respectively extending from the first reflective surfaces 121 and extending horizontally so as to be from obliquely upward sunlight The first reflecting surface 121 and the second reflecting surface 122 are reflected upward. Each of the first reflecting surfaces 121 has an angle θ ₃ with the horizontal mask. When the sunlight illuminates the sunlight reflecting layer 12, the sunlight reflecting layer 12 reflects the sunlight upward, so that the pedestrian is protected from the sunlight. Reflective interference. The angle θ _{3 is} between 38.66° and 56.98°, so that the angle between the horizontal plane and the horizontal plane is between 24 degrees and 49 degrees (for example, the sunset, the sunlight between the sunlight and the horizontal plane shown in FIG. 8). The angle is 49 degrees) and is reflected upward. In addition, in the present embodiment, the angles θ _{3 of the} reflecting surfaces 121 and the horizontal plane are not identical to each other, and are not limited thereto.

Referring to FIG. 9, when the light guiding device 1 for an electronic kanban is mounted on an electronic kanban (not shown), each light guiding unit 11 passes light generated by a light-emitting element 93 of the electronic kanban. In the following, only one light-emitting element is combined with one light-guiding unit 11 as an example to explain how the light emitted by the light-emitting element 93 is guided by the light guiding unit 11.

The light generated by a light-emitting element 93 (only four light paths are drawn by way of example in FIG. 9 ) enters the light guiding unit 11 via the light-incident surface 111 and emits the light guiding unit 11 via the light-emitting surface 112. The direction of the Fresnel lens structure 113 (ie, the first light guiding portion) is refracted into a parallel light beam toward the light exiting surface portion 112 such that the light is refracted at the oblique refracting surface 114a (ie, the second light guiding portion) After the downward tilting, it is noted that since the included angles θ ₁ , θ _{2 are} not identical to each other, the optical path of the portion where the light passes downward through the inclined refractive surface 114a is opposite to that passing through the light-emitting element 93. The angle of the horizontal plane 931 (for example, θ ₄ ) is between 5 degrees and 35 degrees downward, and the optical paths of the portions of the light can be in a direction of 5 degrees downward with respect to the horizontal plane 931 Superimposed, the rest of the light is distributed between 5 degrees up to 35 degrees down. It is added that the light intensity is defined as the luminous flux per unit solid angle, and the light intensity is related to the luminous flux of the unit solid angle superimposed on each other. In other words, the present embodiment can increase the direction downward by 5 degrees with respect to the horizontal plane 931. The intensity of the light produces a light pattern that meets the needs. In the present embodiment, the intensity of the light in the direction of 5 degrees downward with respect to the horizontal axis 931 of the horizontal plane can reach 4 times the light intensity of the original light source (i.e., the light generated by the light-emitting element 93).

Referring to Fig. 10, when a plurality of the light guiding means (not shown) are mounted on an electronic board 9' When the light guiding devices (not shown) are spliced to each other, they are installed in front of the LED array (not shown) of the electronic kanban. Therefore, the light emitted by the LED array is inclined downward, so most of them can be pedestrians. 91 saw.

In summary, in the present embodiment, the light emitted by the light-emitting element 931 is condensed by the Fresnel lens structure 113 and is concentrated toward the light-emitting surface 112, so that the light is in the strip-shaped domes 114. After refracting, it is inclined downward, and thus, the light projected from the electronic kanban can be guided to be mainly projected downward, and further, since the angles θ ₁ , θ _{2 are} not identical to each other, the light passes through The angle of the optical path of the portion inclined downwardly from the obliquely refracting surface 114a with respect to an optical axis 931 of the light-emitting element 93 (for example, θ ₄ ) is between 5 degrees upward and 35 degrees downward, and the The optical paths of the plurality of portions of the light are superimposed on each other with respect to the horizontal plane 931 in a downward direction of 5 degrees, and the remaining portions of the light are distributed between 5 degrees and 35 degrees downward to produce a light pattern that meets the demand. . In addition, the sunlight reflecting layer 12 can reflect the sunlight from the oblique upwards without disturbing the pedestrians, and most of them can be seen by the pedestrian 91, and the energy can be effectively utilized and the characters or symbols displayed on the electronic board can be easily recognized. The object of the invention can be achieved.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

Claims (8)

A light guiding device for an electronic kanban for transmitting light generated by a plurality of illuminating elements of the electronic kanban, the light guiding device for an electronic kanban comprising: a flat plate having an inlet adjacent to the illuminating elements a light end surface and a light exit end surface opposite to the light incident end surface; a plurality of light guiding units formed on the flat plate, each light guiding unit corresponding to one of the light emitting elements and having a light exposed end surface a light guiding portion and a second light guiding portion exposed on the light emitting end surface; and a sunlight reflecting layer shielding the light emitting end surface of the flat plate so that each second light guiding portion is exposed, and having a zigzag shape and having a plurality of first reflecting surfaces extending upwardly away from the light emitting end surface and a plurality of second reflecting surfaces respectively extending from the first reflecting surfaces and extending horizontally, so that the sunlight from the oblique upper surface is the first reflecting surface and the The second reflective surface is upwardly reflected; wherein, for each light guiding unit, the light emitted by the light emitting element corresponding to the light guiding unit enters the light guiding unit via the first light guiding portion and via the second guiding Light The emission state of the light guide unit, the light refraction in the light guide after the first portion of the parallel light beam refracted toward the second light guide portion, so that the light downwardly upon the second light guide portion refracted. The light guiding device for an electronic kanban according to claim 1, wherein: each light guiding unit is a light guiding lens, and has a light incident surface spaced apart from the light emitting element and incident on the light and a light incident surface a first light guiding portion opposite to the light incident surface and for emitting the light, the first light guiding portion is a Fresnel lens structure formed on the light incident surface, the second light guiding portion including a plurality of top and bottom parallel And juxtaposed on the strip-shaped crotch portion of the light-emitting surface; The light incident surface portions of the light guiding units are located on a light incident end surface of the flat plate, and the light emitting surface portions of the light guiding units are located on a light emitting end surface of the flat plate opposite to the light incident end surface, each strip shape The crotch portion has an inclined refractive surface extending downward from the light incident surface portion; for each light guiding unit, the light emitted by the light emitting element corresponding to the light guiding unit enters through the first light guiding portion In a state in which the light guiding unit emits the light guiding unit via the second light guiding unit, the light is condensed by the first light guiding portion and is concentrated toward the second light guiding portion, so that the light is inclined at the light guiding unit The refractive surface is refracted and tilted downward. The light guiding device for an electronic kanban according to claim 2, wherein the light incident surface is recessed toward the light emitting surface portion and forms a receiving groove for receiving the light emitting element, wherein the Fresnel lens structure is located The bottom of the groove of the receiving groove. The light guiding device for an electronic kanban according to claim 2, wherein each of the inclined refractive surfaces has an angle with the horizontal mask, and the angle is between 40° and 85°. The light guiding device for an electronic kanban according to claim 4, wherein the angles of the inclined refracting surfaces and the horizontal plane are not identical to each other, and the light rays are inclined downward after passing through the inclined refracting surfaces. The angle of the portion of the optical path relative to a horizontal plane passing through the illuminating element is between 5 degrees up to 35 degrees down. The light guiding device for an electronic kanban according to claim 1, wherein each of the reflecting surfaces has an angle with the horizontal mask, and the angle is between 38.66 and 56.98. The light guiding device for an electronic kanban according to claim 6, wherein the angles of the reflecting surfaces and the horizontal plane are not identical to each other. The light guiding device for an electronic kanban according to claim 1, further comprising a plurality of sunshades connected to the sunlight reflecting layer and having the same number as the light guiding units, each sunshade being formed on the light guiding The upper edge of one of the units.