CN212056934U

CN212056934U - Blackboard lamp that sectional type throws

Info

Publication number: CN212056934U
Application number: CN202020941018.2U
Authority: CN
Inventors: 潘淑军; 伍德生; 吴海生; 邓栋材; 刘慧�
Original assignee: NVC Lighting Technology Corp
Current assignee: NVC Lighting Technology Corp
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2020-12-01
Anticipated expiration: 2030-05-28

Abstract

The utility model discloses a blackboard lamp that sectional type throws, including long banding lens and with lens parallel arrangement's light source module, lens include incident surface, first refraction face, second refraction face, first total reflection face, second total reflection face and emergent surface, first refraction face and second refraction face are upwards extended by the both sides of incident surface and are formed, and form the light groove of entering of indent with the incident surface; the first total reflection surface and the second total reflection surface are respectively formed by downward turning of the first refraction surface and the second refraction surface; the emergent surface is positioned at the bottom of the lens; the light source module is positioned in the light inlet groove and comprises an aluminum substrate and a light source, and the light source is attached to the aluminum substrate in a sectional mode. The sectional type projection blackboard lamp is provided with the plurality of optical systems, light rays emitted by the light source are projected to different areas of the blackboard, the installation distance of the blackboard lamp can be reduced, the glare influence on teachers is reduced, and meanwhile the chromaticity uniformity of the whole blackboard is improved.

Description

Blackboard lamp that sectional type throws

Technical Field

The utility model belongs to the technical field of the technique of LED illumination and specifically relates to a blackboard lamp that sectional type throws is related to.

Background

In the teaching activity, the blackboard lamp is convenient for teachers to write and students to clearly read contents on the blackboard by increasing the brightness of the blackboard.

The current blackboard lamp illumination has the following problems: (1) the blackboard lamp is installed far away from the blackboard, generally about 0.6-0.8 m away from the blackboard, and the distance is used for illuminating the blackboard, so that a teacher giving lessons below the blackboard is greatly dazzled; if the installation distance of the blackboard lamp is adjusted to about 0.3 m, another problem is caused, namely that the illuminance uniformity on the blackboard cannot reach the standard. (2) A plurality of blackboard lamps are usually installed on one blackboard, and because the lamps are not tightly attached, the illuminance of the blackboard lamps with the space is lower, and the integral uniformity is reduced. In addition, the two ends of the blackboard can cause low illumination and several dark areas. (3) The chromaticity space uniformity of the blackboard lamp is not high, for example, yellow circles appear on the upper part and the chromaticity becomes yellow in the middle.

The chinese patent publication No. CN207569627U provides a high uniformity LED blackboard lamp, which includes a blackboard lamp main body having a lamp body outer frame, a power supply, a PCB circuit board and an optical lens, the blackboard lamp main body is disposed at the front upper side of the blackboard, and is designed into a whole by polarization and light focusing, so as to obtain a good uniformity of vertical illuminance; however, the blackboard lamp provided in the above patent is easy to form yellow spots at the upper and lower ends and the middle of the blackboard, resulting in poor uniformity of chromaticity space.

Therefore, it is necessary to optimally design the structure of the existing LED blackboard lamp, to achieve a shorter installation distance, and to improve the chromaticity uniformity of the blackboard.

Disclosure of Invention

In order to solve the above-mentioned problem that prior art exists, the utility model provides a blackboard lamp that sectional type throws, it is through setting up a plurality of optical system, projects the light that the light source sent to the different regions of blackboard, can reduce the installation distance of blackboard lamp, reduces the glare influence to mr, has improved the degree of consistency of whole blackboard simultaneously.

In order to achieve the above object, the present invention provides the following technical solutions:

a blackboard lamp capable of being projected in a sectional mode comprises a long-strip-shaped lens and a light source module arranged in parallel with the lens, wherein the lens comprises an incident surface, a first refraction surface, a second refraction surface, a first total reflection surface, a second total reflection surface and an emergent surface, the first refraction surface and the second refraction surface are formed by upwards extending two sides of the incident surface and form an inwards concave light inlet groove together with the incident surface; the first total reflection surface and the second total reflection surface are respectively formed by turning back the first refraction surface and the second refraction surface downwards; the emergent surface is positioned at the bottom of the lens; the light source module is positioned at the top of the light inlet groove and comprises an aluminum substrate and a light source, and the light source is attached to the aluminum substrate in a sectional mode.

In the blackboard lamp, the light source module is arranged in parallel with the strip-shaped lens, namely the light source module is transversely arranged in the lens, and the lens is combined with the incident surface and the emergent surface by arranging different refraction surfaces and total reflection surfaces to form a plurality of optical systems, so that the blackboard is respectively illuminated, and the chromaticity uniformity of the whole blackboard is improved.

As the technical scheme of the utility model further describe, first refraction face with first total reflection face constitutes first optical system, the latter half of blackboard is shone to the light of light source via first optical system and emitting surface.

As a further description of the technical solution of the present invention, the second refraction surface with the second total reflection surface constitutes the second optical system, the light of the light source irradiates the upper half of the blackboard via the second optical system and the outgoing surface.

As a further description of the technical solution of the present invention, the incident surface and the exit surface constitute a third optical system 30, and the light of the light source irradiates the entire plane of the blackboard via the third optical system.

Light rays emitted by a light source of the light source module respectively pass through the first optical system, the second optical system and the third optical system, are emitted from the emitting surface and are projected on the blackboard in a sectional mode, so that the mounting distance of a blackboard lamp to the blackboard is 0.3-0.35 m, glare to teachers is reduced, meanwhile, the chromaticity uniformity of the whole blackboard is improved, and the chromaticity uniformity of the whole blackboard reaches over 90%.

As a further description of the technical solution of the present invention, the first refraction surface is a plane, and the included angle α between the first refraction surface and the vertical axis is within a range of 3 ° to 5 °; the first total reflection surface is a free curved surface.

As a further description of the technical solution of the present invention, the second refraction surface is a plane, and the included angle β between the second refraction surface and the vertical axis is within the range of 3 ° to 5 °; the second total reflection surface is a free-form surface.

As a further description of the technical solution of the present invention, the incident surface is a plane or a curved surface, and the emergent surface is a plane.

As a further description of the technical solution of the present invention, when the incident surface is a plane, the included angle θ between the incident surface and the horizontal axis is in the range of 5 ° to 10 °.

Through the design of the structures of the refraction surface, the total reflection surface, the incident surface and the emergent surface, the light path of emergent light of the light source can be optimized, and the effects of no glare and high chromaticity space uniformity are achieved.

As a further description of the technical solution of the present invention, the aluminum substrate is divided into a first region, a second region and a third region according to the number of the attached light sources, the first region and the third region are located at two ends of the aluminum substrate, and the second region is located in the middle of the aluminum substrate; the number of light sources of the first area and the third area is more than that of the second area.

As a further description of the technical solution of the present invention, the light source arrangement of the first region is symmetrical to the third region, and the light source quantity of the first region and the third region is twice the light source quantity of the second region.

In order to solve the problem of dark bands generated by gaps between light sources (lamp beads) on the blackboard lamp, the blackboard lamp is adjusted on the light source arrangement, a non-uniform arrangement light source structure is adopted, namely the quantity of light sources at two end regions of the aluminum substrate is greater than that of the light sources in the middle region, the arrangement of the light sources at the two end regions is symmetrical, the illumination uniformity of the whole blackboard can be improved, and the illumination comfort is improved.

Based on foretell technical scheme, the utility model discloses the technological effect who gains does:

(1) the utility model provides a blackboard lamp that sectional type was thrown through setting up a plurality of optical system, with the light that the light source sent via first optical system, second optical system and third optical system, by the different regions of emergent face projection blackboard, the installation distance between reducible blackboard lamp and the blackboard reduces the glare influence to mr, has improved the degree of consistency of whole blackboard simultaneously.

(2) The utility model discloses a blackboard lamp that sectional type throws has adopted the light source structure of non-uniform arrangement on the light source for the regional light source quantity in aluminium base board both ends is greater than middle zone's light source quantity, and the regional light source in both ends is arranged symmetrically moreover, can solve the dark space problem between light source and the light source like this, also improves the illuminance degree of consistency of whole blackboard simultaneously, promotes the illumination travelling comfort.

Drawings

Fig. 1 is a schematic plan view of the sectional type projecting blackboard lamp of the present invention.

Fig. 2 is a schematic structural diagram of the lens of the present invention.

Fig. 3 is a cross-sectional view of the lens of the present invention.

Fig. 4 is an optical schematic diagram of the light projected to the blackboard through the first optical system according to the present invention.

Fig. 5 is an optical schematic diagram of the light projected to the blackboard through the second optical system according to the present invention.

Fig. 6 is an optical schematic diagram of the light projected to the blackboard through the third optical system according to the present invention.

Fig. 7 is a schematic structural diagram of the light source module according to the present invention.

Detailed Description

To facilitate an understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings and specific examples. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

Fig. 1 is a schematic plan view of a blackboard lamp for sectional projection according to the present embodiment, fig. 2 is a schematic structural view of a lens according to the present embodiment, fig. 3 is a sectional view of the lens according to the present embodiment, and with reference to fig. 1 to fig. 3, a blackboard lamp for sectional projection includes a lens 1 and a light source module 2 disposed above the lens, as shown in fig. 2, the lens 2 is a long strip structure, and if the lens is vertically cut, each section perpendicular to the long axis direction is the same, that is, the lens 2 is a uniform and integral optical component, and the material may be PMMA or PC. In the lens cross-sectional view shown in fig. 1, the lens 1 includes an incident surface 11, a first refractive surface 12, a second refractive surface 13, a first total reflection surface 14, a second total reflection surface 15, and an exit surface 16. The first refraction surface 12 and the second refraction surface 13 are preferably flat surfaces, and are formed by extending two sides of the incident surface 11 upwards, the first refraction surface 12, the second refraction surface 13 and the incident surface 11 form an inward concave light entering groove 17, the light source module 2 is arranged at the top of the light entering groove 17, namely, is located at the top of the light entering groove 17, and light emitted by the light source module 2 enters the lens 1 through the incident surface, the first refraction surface 12 and the second refraction surface 13 to be optically processed.

The first refracting surface 12 is folded back downward to form a first total reflecting surface 14, and the second refracting surface 13 is folded back downward to form a second total reflecting surface 15. The exit surface 16 is the exit surface of the lens, which is preferably a flat surface, located at the bottom of the lens 1. Preferably, a fixing seat, which is rectangular and is used for being installed in the lamp, may be further disposed between the exit surface 16 and the first total reflection surface 14 and the second total reflection surface 15.

The light source module 2 includes an aluminum substrate 21 and a light source 22, and the light source is an SMD patch light source disposed on the aluminum substrate.

Fig. 4 to 6 respectively show optical schematic diagrams of light rays of the light source module of the present embodiment projected onto the blackboard via the first optical system, the second optical system and the third optical system, and referring to fig. 4 to 6, as can be seen in conjunction with the lens cross-sectional view of fig. 3, the present embodiment divides the blackboard B into an upper half portion B1 and a lower half portion B2 from the middle, and the two portions of the upper half portion B1 and the lower half portion B2 will be illuminated by different optical systems of the lens 1, respectively.

(1) As shown in fig. 4, the first refraction surface 12 and the first total reflection surface 14 constitute a first optical system 10, the first optical system 10 is responsible for illumination of the lower portion B2 of the blackboard, and light emitted from the light source 22 is refracted by the first refraction surface 12, incident on the first total reflection surface 14, totally reflected by the first total reflection surface, and emitted through the exit surface 16, and finally the light will irradiate the lower portion B2 of the blackboard B. In order to ensure that the first optical system 10 composed of the first refractive surface 12 and the first total reflection surface 14 projects light onto the lower half B2 of the blackboard, the present embodiment performs the following processing on the first refractive surface 12 and the first total reflection surface 14: the first refraction surface 12 is a plane, and forms an included angle α with the vertical axis y, the value range of α is 3 ° to 5 °, and in this embodiment, the preferred angle of α is 3 °; the first total reflection surface 14 is a free curved surface, and the curvature of the curved surface changes gently.

(2) As shown in fig. 5, the second refracting surface 13 and the second total reflecting surface 15 form a second optical system 20, the second optical system 20 is responsible for illuminating the upper part B1 of the blackboard, and the light emitted from the light source 22 is refracted by the second refracting surface 13, then enters the second total reflecting surface 15, is totally reflected by the second total reflecting surface 1, then exits through the exit surface 16, and finally irradiates the upper part B1 of the blackboard. In order to ensure that the second optical system 20 composed of the second refraction surface 13 and the second total reflection surface 15 projects the light onto the upper half B1 of the blackboard, the second refraction surface 13 and the second total reflection surface 15 are processed as follows: the second refraction surface 13 is a plane, and forms an included angle β with the vertical axis y, the value range of β is 3 ° -5 °, and in this embodiment, the preferred angle of β is 3 °; the second total reflection surface 15 is a free curved surface, the curvature of the curved surface changes greatly, and as can be seen from fig. 3, the shape of the second total reflection surface 15 is closer to a circular arc.

(3) If only the illuminance uniformity is considered, the light distribution projected by the two optical systems, namely the first optical system and the second optical system, irradiates the upper part and the lower part of the blackboard, so that the requirement can be met, but yellow spots are easily formed at the upper end and the lower end of the blackboard and in the middle of the blackboard due to the optical distribution, the chromaticity space uniformity is not high, and the overall illumination effect of the blackboard is influenced. Therefore, as shown in fig. 6, the incident surface 11 and the exit surface 16 of the present embodiment also constitute a third optical system 30, and the third optical system 30 is responsible for weakening the macula lutea formed by the first optical system and the second optical system. The light emitted from the light source 22 is refracted through the incident surface 11, then refracted again through the exit surface 16, and finally the light will be irradiated to the entire plane of the blackboard B.

In order to ensure that all the light rays passing through the third optical system 30 composed of the incident surface 11 and the exit surface 16 will be incident on the entire plane of the blackboard, the present embodiment performs the following processing on the incident surface 11 and the exit surface 16: the outgoing surface 16 facing the blackboard is larger than the incoming surface 11 far from the blackboard, the incoming surface 11 can be selected to be a plane or a curved surface, and the outgoing surface 16 is a plane. In this embodiment, when the incident surface 11 is preferably a plane, it forms an included angle θ with the horizontal axis x, the value range of θ is between 5 ° and 10 °, and θ can be designed according to the distance between the blackboard lamp and the upper edge of the blackboard.

In the blackboard lamp provided by the embodiment, light rays emitted by the light source of the light source module respectively pass through the first optical system, the second optical system and the third optical system of the lens, are emitted from the emergent surface, and are projected onto the blackboard in a sectional manner, so that the installation distance of the blackboard lamp from the blackboard is 0.3-0.35 m, glare to a teacher is reduced, meanwhile, the chromaticity uniformity of the whole blackboard is improved, and the chromaticity uniformity of the whole blackboard reaches more than 90%.

Example 2

Because on the blackboard lamp, there is the clearance between the light source (lamp pearl) of light source module, can produce the dark zone like this, lead to the illuminance at blackboard edge to hang down on the side. Therefore, the light source arrangement at the top of the lens needs to be adjusted. The light source of the present embodiment adopts an optical scheme with non-uniform arrangement.

Fig. 7 shows a schematic structural diagram of the light source module of the present embodiment, as shown in fig. 7, the light source module 2 includes an aluminum substrate 21 and light sources 22, the light sources 22 are SMD patch light sources, and the light sources 22 are attached to the aluminum substrate 21 in a segmented manner, that is, the light sources 22 disposed on the aluminum substrate 21 are not uniformly arranged. In the present embodiment, the aluminum substrate 21 is divided into the first region 211, the second region 212, and the third region 213 according to the number of the attached light sources 22. Preferably, the first region 211, the second region 212, and the third region 213 are divided into equal lengths. The first region 211 and the third region 213 are located at two ends of the aluminum substrate 21, and the second region 212 is located in the middle of the aluminum substrate 21.

In order to solve the problem of dark bands generated by gaps among the light sources, the number of the light sources in the first region 211 and the third region 213 is greater than that in the second region 212, and in this embodiment, the number of the light sources in the first region 211 and the third region 213 is twice as large as that in the second region 212.

With further reference to fig. 7, the light source arrangements of the first region 211 and the third region 213 are symmetrical. Preferably, the light sources (lamp beads) in the two regions may be uniformly arranged, or may be arranged in an arithmetic progression manner, and if the light sources are arranged in an arithmetic progression manner, the arrangement density of the light sources at the two ends of the aluminum substrate 21 must be greater than that of the light sources in the middle.

The light source arrangement mode of the second region is similar to that of the first region and the second region, light sources (lamp beads) of the second region can be uniformly arranged, and can also be arranged in an arithmetic progression mode, if the light sources are arranged in the arithmetic progression mode, the arrangement density of the light sources at two ends of the second region must be greater than that of the light sources in the middle.

Through the light source mode of arranging as above, can solve and have the dark band problem that the clearance produced between the light source, also can improve the illuminance at blackboard edge simultaneously to improve the illuminance degree of consistency of whole blackboard, promote the illumination comfort level.

The foregoing is merely illustrative and explanatory of the structure of the present invention, which is described in more detail and with greater particularity, and is not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, many variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.

Claims

1. The blackboard lamp capable of being projected in a segmented mode comprises a long-strip-shaped lens (1) and a light source module (2) arranged in parallel with the lens (1), and is characterized in that the lens (1) comprises an incident surface (11), a first refraction surface (12), a second refraction surface (13), a first total reflection surface (14), a second total reflection surface (15) and an emergent surface (16), wherein the first refraction surface (12) and the second refraction surface (13) are formed by upwards extending two sides of the incident surface (11) and form an inwards-concave light inlet groove (17) together with the incident surface (11); the first total reflection surface (14) and the second total reflection surface (15) are respectively formed by downward folding of the first refraction surface (12) and the second refraction surface (13); the exit surface (16) is positioned at the bottom of the lens (1); the light source module (2) is positioned at the top of the light inlet groove (17) and comprises an aluminum substrate (21) and a light source (22), and the light source (22) is attached to the aluminum substrate (21) in a sectional manner.

2. A blackboard lamp according to claim 1, characterised in that the first refraction surface (12) and the first total reflection surface (14) constitute a first optical system (10), and the light of the light source (22) is irradiated to the lower half of the blackboard via the first optical system (10) and the exit surface (16).

3. A blackboard lamp according to claim 1, characterised in that the second refraction surface (13) and the second total reflection surface (15) constitute a second optical system (20), and the light of the light source (22) is irradiated to the upper part of the blackboard via the second optical system (20) and the exit surface (16).

4. A blackboard lamp according to claim 1, characterised in that the incident surface (11) and the exit surface (16) constitute a third optical system (30), and the light of the light source (22) is irradiated to the whole plane of the blackboard via the third optical system (30).

5. A blackboard light according to any of claims 1 or 2, characterised in that the first refraction surface (12) is a plane with an angle α ranging between 3 ° and 5 ° with the vertical axis; the first total reflection surface (14) is a free curved surface.

6. A blackboard light according to any of claims 1 or 3, characterised in that the second refraction surface (13) is a plane with an angle β in the range 3 ° -5 ° to the vertical axis; the second total reflection surface (15) is a free curved surface.

7. A blackboard lamp according to any of claims 1 or 4, characterised in that the incident surface (11) is a plane or curved surface and the exit surface (16) is a plane.

8. Blackboard light according to claim 7, characterised in that the incident surface (11), when it is plane, has an angle θ ranging between 5 ° and 10 ° with the horizontal axis.

9. The blackboard lamp according to claim 1, characterized in that the aluminum substrate (21) is divided into a first area (211), a second area (212) and a third area (213) according to the number of the attached light sources (22), the first area (211) and the third area (213) are located at two ends of the aluminum substrate (21), and the second area (212) is located at the middle position of the aluminum substrate (21); the number of light sources of the first region (211) and the third region (213) is greater than the number of light sources of the second region (212).

10. The blackboard lamp according to claim 9, characterized in that the light source arrangement of the first area (211) is symmetrical to the third area (213), and the number of light sources of the first area (211) and the third area (213) is twice as many as that of the second area (212).