TWI645217B - Light guiding lens - Google Patents

Abstract

A light guiding lens for passing light generated by a light emitting element of an electronic board. The light guiding lens has a light incident surface for the light incident, a light emitting surface opposite to the light incident surface for emitting the light, a Fresnel lens structure formed on the light incident surface, and a plurality of The strip-shaped crotch portion of the light-emitting surface portion is laterally extended from the top to the bottom, and each of the strip-shaped crotch portions has an inclined refractive surface extending downward from the light-incident surface portion. In a state where the light enters the light guiding lens through the light incident surface and the light guiding lens is emitted through the light emitting surface, the direction of the light is refracted into a parallel light beam toward the light emitting surface by the Fresnel lens structure, so that the light The light is slanted downward after being refracted by the inclined refracting surfaces.

Description

Light guiding lens

The present invention relates to a light guiding lens, and more particularly to a light guiding lens 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.

Accordingly, it is an object of the present invention to provide a light guide lens for an electronic sign for use in an electronic signage and for the passage of a light source generated by a light emitting module to overcome the deficiencies of the prior art.

Accordingly, it is an object of the present invention to provide a light guiding lens through which light generated by a light emitting element of the electronic signage passes. The light guiding lens comprises a light guiding lens having a light incident surface for the light incident, a light emitting surface opposite to the light incident surface and emitting the light, and a phenanthrene formed on the light incident surface And a plurality of strip-shaped crotch portions juxtaposed on the light-emitting surface portion extending from top to bottom and extending laterally from each other, each of the strip-shaped crotch portions having an inclined refractive surface extending downward from the light-incident surface portion. In a state where the light enters the light guiding lens through the light incident surface and the light guiding lens is emitted through the light emitting surface, the direction of the light is refracted into a parallel light beam toward the light emitting surface by the Fresnel lens structure, so that the light The light is slanted 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.

The present invention has at least the following effects: the light emitted by the light-emitting element is refracted by the Fresnel lens structure into a parallel light beam toward the light-emitting surface portion, so that the light is tilted downward after being refracted by the inclined refractive surfaces, thus, The light projected by the electronic kanban can be directed to project mainly downwards, most of which can be seen by pedestrians, and can effectively utilize energy and make the text or figure displayed on the electronic kanban easily recognized.

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 Figures 2 to 4, an embodiment of the light guiding lens 11 of the present invention is suitably implemented as part of a light guiding device 1. The light guiding device 1 comprises a flat plate 10, a plurality of light guiding lenses 11 formed on the flat plate 10 in a checkerboard array, a sunlight reflecting layer 12 connected to the flat plate 10, and a plurality of solar reflecting layers 12 connected thereto. The sunshade 13 is the same number as the number of the light guiding lenses 11. Each sunshade cover 13 is located at an upper edge of one of the light guiding lenses 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.

Referring to FIG. 5, each light guiding lens 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 lenses 11 are located on the light incident end surface 101, and the light emitting surface portions 112 of the light guiding lenses 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 of the light guiding lenses 11 is the same, and only one of the light guiding lenses 11 will be described below. In the light guiding lens 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} first 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 of the light guiding lenses 11 passes light generated by a light emitting element 931 of the electronic kanban. In the following, only one light-emitting element 93 is combined with a light guiding lens 11 as an example to explain how the light emitted by the light-emitting element is guided by the light guiding lens 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 guide lens 11 via the light incident surface portion 111 and emits the light guide lens 11 via the light exit surface 112, the light 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 devices (not shown) are mounted on an electronic kanban 9', the light guiding devices (not shown) are LED arrays that are spliced to each other and mounted on the electronic kanban. (not shown) in front, therefore, the light emitted by the LED array is tilted downward so that most of it can be seen by the pedestrian 91.

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.

1‧‧‧Light guide

10‧‧‧ tablet

101‧‧‧Incoming light end face

102‧‧‧Lighting end face

11‧‧‧Light guide lens

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

93‧‧‧Lighting elements

931‧‧‧ horizontal plane

91‧‧‧Pedestrians

θ ₁ ‧‧‧ angle

θ ₂ ‧‧‧ angle

θ ₃ ‧‧‧ angle

θ ₄ ‧‧‧ angle

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: FIG. 1 is a schematic diagram illustrating a conventional electronic kanban; FIG. 2 is a perspective view illustrating a plurality of light guiding lenses of the present invention. Figure 3 is an exploded perspective view of a light guiding device; Figure 4 is a rear elevational view of the light guiding device; Figure 5 is a portion along the VV direction of Figure 4 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 6 is a partial enlarged view of FIG. 5 illustrating the light guiding lens; FIG. 7 is a side view illustrating the embodiment; FIG. 8 is a partial enlarged view of FIG. Figure 9 is a front view showing a plurality of the light guiding devices spliced to each other; and Figure 10 is a schematic view showing the light of an electronic kanban equipped with a plurality of light guiding devices spliced together tilt.

Claims (4)

A light guiding lens for passing light generated by a light emitting element of an electronic signboard, the light guiding lens comprising: a light incident surface spaced apart from the light emitting element and incident on the light incident surface, and opposite to the light incident surface a light-emitting surface for emitting the light, a Fresnel lens structure formed on the light-incident surface, and a plurality of strip-shaped crotch portions which are laterally extended from the top to the bottom and juxtaposed on the light-emitting surface, each of the strips The portion has an inclined refractive surface extending downward from the light incident surface; wherein the light enters the light guiding lens through the light incident surface and the light guiding lens is emitted through the light emitting surface The Neel lens structure is refracted into a parallel beam directed toward the exit face such that the rays are refracted downwardly at the oblique refracting faces. The light guide lens of claim 1, wherein the light incident surface is recessed toward the light exiting surface and defines a receiving groove for receiving the light emitting element, and the Fresnel lens structure is located at the bottom of the receiving groove. The light guiding lens of claim 1, wherein each of the oblique refractive surfaces has an angle with the horizontal mask, the included angle being between 40° and 85°. The light guiding lens of claim 3, wherein 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 light slanting downwardly after passing through the inclined refracting surface is opposite to The angle through the horizontal plane of the illuminating element is between 5 degrees up to 35 degrees down.