CN105042444A - Blackboard LED lamp - Google Patents

Abstract

A blackboard LED lamp comprises an LED light source and a lens, the cross section of the lens is approximately of a quadrilateral structure, the bottom surface of the lens is provided with an incident surface which is positioned above the LED light source so that most of the light emitted by the LED light source enters the incident surface, the top surface of the lens is a first emergent surface which is approximately parallel or obliquely arranged relative to the bottom surface, one side surface of the lens forms a reflecting surface which is used for reflecting the light refracted from the incident surface towards the first emergent surface and enabling the reflected light to be emitted from the first emergent surface, the other side surface of the lens forms a second emergent surface for outwardly refracting the light refracted from the incident surface, the top of the second emergent surface is connected with the first emergent surface, the bottom of the second emergent surface is positioned at one side of the LED light source, and the second emergent surface is integrally arranged in an inclined way towards the direction close to the LED light source. The blackboard LED lamp can irradiate in a polarized mode.

Description

Blackboard LED lights

technical field

The invention relates to the field of LED lighting, in particular to a blackboard LED lamp.

Background technique

At present, the blackboard lamps in the classroom use T8 lamp tubes and reflectors for light distribution. With the rise of LEDs, T8 lamp tubes will be replaced. Due to the directional light produced by the light-emitting principle of the LED, light from a point source, easy to glare and other factors, the previous reflectors cannot be shared. Therefore, it is necessary to design a new reflector to match the LED light source. The optical free-form surface requires very high precision of the aluminum reflector. Such a large and heavy aluminum reflector poses a great challenge to the process and cost. For example, the date of authorization announcement is February 08, 2012, and the Chinese utility model patent with the patent number 201120205735.X discloses a blackboard lamp. The utility model discloses a blackboard lamp, which includes a supporting structure and can be installed on a blackboard. Near the side or the lower side; a strip-shaped lampshade, the two ends of which are pivotally fixed to the support structure, and a reflective groove is formed on one side of the lampshade, and the wall surface of the reflective groove is formed by at least one curved surface; a strip-shaped lighting device, It is arranged near the center in the reflective groove, and its illumination direction is at least towards the reflective groove. Although the blackboard light can produce a certain angle of light distribution, when using a linear light source made of LED light sources, it is difficult to obtain a better light distribution through the existing reflector, so it is necessary to find a new way.

Contents of the invention

In view of this, it is necessary to provide a blackboard LED lamp that can realize polarized light irradiation.

The technical solution adopted by the present invention is: a blackboard LED lamp, including an LED light source and a lens, the cross section of the lens is roughly a quadrilateral structure, the bottom surface of the lens is provided with an incident surface, and the incident surface is located on the LED light source, so that Most of the light emitted by the LED light source enters the incident surface, the top surface of the lens is the first exit surface, and the first exit surface is approximately parallel or inclined to the bottom surface thereof. One side of the lens forms a reflective surface, and the reflective surface It is used to reflect the light refracted from the incident surface toward the first exit surface and make the reflected light exit from the first exit surface, the other side of the lens forms a second exit surface, and the second exit surface is used for The light refracted from the incident surface is refracted outward, the top of the second exit surface is connected to the first exit surface, the bottom of the second exit surface is located on one side of the LED light source, and the second exit surface faces as a whole The direction close to the LED light source is obliquely arranged.

Compared with the prior art, the blackboard LED lamp is provided with the lens, and after the light emitted by the LED light sources enters the incident surface of the lens, part of the light is reflected by the reflective surface located on one side and then refracted by the first exit surface. After exiting, a part of the light is directly refracted by the second exit surface located on the other side and then exits, so that the light is deflected to one side of the lens, and further, the second exit surface is set obliquely towards the direction close to the LED light source as a whole , so that the light is better deflected to one side of the lens to meet the polarized illumination requirements of the blackboard surface lighting, and effectively utilizes the light emitted by the LED light source at different angles, so that the blackboard LED light also has the advantage of uniform light distribution.

Description of drawings

Fig. 1 is a perspective view of a blackboard LED lamp according to the first embodiment of the present invention.

Fig. 2 is a cross-sectional view of the blackboard LED lamp shown in Fig. 1 .

Fig. 3 is a front view of the lens in the blackboard LED lamp shown in Fig. 2 .

FIG. 4 is a schematic diagram of the optical path of the lens shown in FIG. 3 .

Explanation of reference signs:

10LED light source 20 lenses

21 incident surface 211 first incident surface

212 second incident surface 22 first outgoing surface

23 reflective surface 24 second exit surface

241 Light guide part 242 Recessed part

Detailed ways

FIG. 1 is a perspective view of a blackboard LED lamp according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the blackboard LED lamp shown in FIG. 1 . The blackboard LED lamp includes an LED light source 10 and a lens 20 . In this embodiment, the blackboard LED lamp includes a plurality of LED light sources 10, and these LED light sources 10 are arranged on a strip-shaped light source board and arranged in a straight line, and the lens 20 is a strip-shaped structure (as shown in Figure 1).

Please refer to FIG. 2 and FIG. 3 . For the convenience of description, in this embodiment, the position where the LED light source 10 is located is taken as the bottom. The cross section of the lens 20 is roughly quadrilateral, and the bottom surface of the lens 20 is provided with an incident surface 21, the incident surface 21 is located approximately directly above the LED light source 10 and covers the LED light source 10, so that the LED light source 10 emits Most of the light rays enter the incident surface 21. The incident surface 21 includes a first incident surface 211 and a second incident surface 212 , and the first incident surface 211 and the second incident surface 212 form a groove for accommodating the LED light source 10 . The first incident surface 211 and the second incident surface 212 are two intersecting inclined surfaces or arc surfaces. The first incident surface 211 and the second incident surface 212 can divide the incident light into two parts. If necessary, adjust the relative inclination angle or relative size of the first incident surface 211 and the second incident surface 212, and the More light from the LED light source 10 is distributed to the first incident surface 211 or the second incident surface 212 .

Referring to FIGS. 3 to 4 , the top surface of the lens 20 is a first emitting surface 22 , and the first emitting surface 22 is substantially parallel or inclined relative to the bottom surface thereof. In this embodiment, preferably, the first emitting surface 22 is approximately flat, the first emitting surface 22 is arranged approximately parallel to the incident surface 21, the first emitting surface 22 is located directly above the LED light source 10 and its projection covers The LED light source 10 .

3 to 4, one side of the lens 20 forms a reflective surface 23, and the reflective surface 23 is used to reflect the light refracted from the incident surface 21 toward the first exit surface 22 and make the reflected light flow from the first exit surface 22. The first emitting surface 22 emits. Preferably, the reflective surface 23 is an outwardly convex arc surface. Wherein, the first incident surface 211 is inclined relative to the LED light source 10 in a direction away from the reflective surface 23, and the first incident surface 211 is used to refract the light emitted from the LED light source 10 toward the reflective surface 23. . In actual use, the light is refracted by the first incident surface 211 and then reflected by the reflective surface 23 towards the first exit surface 22, and then this part of the light is refracted at the first exit surface 22 again and exits to the blackboard surface the lower part.

In addition, the other side surface of the lens 20 forms a second exit surface 24, and the second exit surface 24 is used to refract outward the light rays refracted from the second incident surface 212 of the incident surface 21, and the second exit surface 24 The top is connected to the first emitting surface 22 , the bottom of the second emitting surface 24 is located on one side of the LED light source 10 , and the second emitting surface 24 is inclined toward the direction close to the LED light source 10 as a whole. In actual use, the second emitting surface 24 is set towards the direction of the blackboard surface, so that the light is refracted toward the upper part of the blackboard surface. Wherein, the second incident surface 212 is inclined relative to the LED light source 10 in a direction away from the second exit surface 24 , and the second incident surface 212 is used for refracting another part of light toward the second exit surface 24 . In addition, the second emitting surface 24 is provided with a light guide portion 241 (as shown in FIG. 3 ) that protrudes toward the direction away from the LED light source 10 and toward the direction of the outgoing light of the first emitting surface 22 (as shown in FIG. 3 ). 241 is disposed at the position where the first emitting surface 22 is connected to the second emitting surface 24 . The light guiding portion 241 is used for refracting the light toward a direction substantially parallel to the outgoing light of the first outgoing surface 22 . In actual use, since the lower part of the blackboard surface is farthest from the blackboard LED light, the light intensity requirement is the strongest, and the light guide part 241 can emit more light toward the lower part of the blackboard surface, so as to distribute more light to the blackboard The lower part of the surface, so that the overall lighting effect is uniform. Further, the second outgoing surface 24 is recessed toward the LED light source 10 below the light guide portion 241 to form a concave portion 242, and the concave portion 242 is used to cooperate with the second incident surface 212 to form a concave lens structure, so that through Part of the light refracted by the second incident surface 212 is refracted by the concave portion 242 and then exits towards the upper part of the blackboard surface. The transition between the light guiding portion 241 and the concave portion 242 is smooth.

To sum up, when the blackboard LED light is provided with the lens 20, after the light emitted by the LED light sources 10 is incident on the incident surface 21 of the lens 20, part of the light is reflected by the reflective surface 23 on one side and then passes through the first The exit surface 22 is refracted and exits, and a part of the light is directly refracted by the second exit surface 24 on the other side and then exits, so that the light is deflected to one side of the lens. Further, the second exit surface 24 as a whole faces close to the The direction of the LED light source 10 is obliquely set, so that the light is better biased to one side of the lens 20, so as to meet the special needs of the blackboard surface illumination, and effectively utilize the light emitted by the LED light source 10 at different angles, so that the blackboard LED light It also has the advantage of uniform light distribution.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Anyone skilled in the art may use the technical content disclosed above to make some changes as equivalent changes without departing from the technical scope of the solution. Example. However, in order to deviate from the content of the technical solution of the present invention, any modifications, equivalent replacements, improvements, etc. made to the above embodiments according to the technical essence of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a blackboard LED, comprise LED light source and lens, it is characterized in that: the cross section of these lens is roughly quadrilateral structure, the bottom surface of these lens is provided with the plane of incidence, this plane of incidence is positioned on this LED light source, the light major part that this LED light source is sent enters this plane of incidence, the end face of these lens is the first exit facet, this first exit facet is almost parallel relative to its bottom surface or be obliquely installed, a side of these lens forms reflecting surface, this reflecting surface is used for reflecting from the next light of this plane of incidence refraction towards this first exit facet and the light by reflecting being penetrated from this first exit facet, another side of these lens forms the second exit facet, this second exit facet is used for the light that outwards refraction comes from the refraction of this plane of incidence, the top of this second exit facet is connected with this first exit facet, the bottom of this second exit facet is positioned at the side of this LED light source, and the overall direction towards this LED light source close of this second exit facet is obliquely installed.

2. blackboard LED according to claim 1, is characterized in that: this second exit facet is provided with towards the light guide section protruded away from this LED light source direction, and this light guide section is used for the direction of light towards the emergent ray of this first exit facet almost parallel to reflect.

3. blackboard LED according to claim 2, is characterized in that: the direction that this light guide section is partial to the emergent ray of this first exit facet is arranged.

4. blackboard LED according to claim 1, is characterized in that: this plane of incidence comprises first plane of incidence and second plane of incidence, and this first plane of incidence and second plane of incidence form the groove holding this LED light source.

5. blackboard LED according to claim 4, is characterized in that: this first plane of incidence is relative to this LED light source in the acclivitous setting in side away from this reflecting surface, and this first plane of incidence is used for a part of light to reflect towards this reflecting surface.

6. blackboard LED according to claim 4, is characterized in that: this second plane of incidence is relative to this LED light source in the acclivitous setting in side away from this second exit facet, and this second plane of incidence is used for another part light to reflect towards this second exit facet.

7. blackboard LED according to claim 2, is characterized in that: this light guide section is arranged on the position that this first exit facet is connected with this second exit facet.

8. blackboard LED according to claim 1, is characterized in that: this second exit facet is recessed to form recess in the below of this light guide section towards this LED light source, and this recess is used for coordinating with this second plane of incidence forming concavees lens structure.

9. blackboard LED according to claim 1, is characterized in that: this first exit facet is roughly plane, and almost parallel this plane of incidence of this first exit facet is arranged, and this first exit facet is positioned at directly over this LED light source and its projection covers this LED light source.

10. blackboard LED according to claim 1, is characterized in that: comprise plurality of LEDs light source, and on the light source board that described LED light source is arranged on a strip and the arrangement in yi word pattern, these lens are to should the string configuration that arranges of light source board.