CN107740957B - Mixed lens combination blackboard lamp - Google Patents

Abstract

The invention relates to a mixed lens combined blackboard lamp, which uses two or more than two lens combinations with different light-emitting angles to uniformly irradiate light rays of corresponding LED lamp belts on a blackboard in a layered manner, thereby realizing super-short-distance illumination of the blackboard lamp and achieving the effect of high-uniformity illumination of the blackboard. Meanwhile, due to the fact that the irradiation distance is short, emergent rays of the LED blackboard lamp cannot directly penetrate into human eyes, and glare to teachers and students can be effectively reduced. The support frame is liftable and flexible to adapt to different actual demands, the junction of support frame and lamp body adopts to rotate to be connected moreover, is used for adjusting the whole angle of shining of whole lamp. In the invention, the centers of the lenses correspond to the LEDs one by one, the emergent direction is controlled to be a rotationally symmetric small-angle light distribution curve, more light rays can fall on a blackboard, and compared with the strip-shaped lenses in the prior art, the light effect of the whole lamp is higher, the independent lenses are combined more freely and flexibly, and the energy utilization rate is higher.

Description

A hybrid lens combination blackboard light

technical field

The present invention relates to the field of educational lighting, and more particularly, to a hybrid lens combination blackboard lamp.

Background technique

The traditional classroom blackboard lighting uses traditional T8 lamps. The light of the T8 tube is directly and indirectly reflected to the blackboard surface through the large-area reflector. In order to cover the entire blackboard, the lamps need to be set at a longer distance. , Only by illuminating the blackboard from a long distance can the entire blackboard be illuminated.

However, long-distance lighting can easily cause the light to directly enter the teacher's eyes, which will cause serious glare to the teacher.

With the rapid development of LED lighting, LED blackboard lights are also produced, but the common LED blackboard lights use a strip lens or a single lens multi-head combination optical method, but these optical solutions always require long-distance lighting to illuminate the entire Blackboard, because the LED is point light, the light intensity is stronger than the T8 tube, so the glare caused is heavier.

For example, Chinese invention patent application 201710113940.5 proposes a high-brightness and high-uniformity LED blackboard light, including: a lamp bracket and a light source assembly. The LED light bar, the lens and the adjustment end caps arranged on both ends of the aluminum-shaped mounting bar are installed in the LED light bar and the lens; Light-guiding semi-solid semi-liquid silica gel, the lens is formed with a prismatic surface on one side facing the LED light bar, and a frosted arc surface is formed on the opposite side.

It can be seen that the above invention still has the problem that long-distance lighting is required, causing more serious glare.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a hybrid lens combination blackboard lamp that realizes short-range illumination, uniform illumination, and avoids glare.

The technical scheme of the present invention is as follows:

A hybrid lens combination blackboard lamp, comprising a support frame and a lamp body, the lamp body includes at least two rows of LED light strips, and a lens is provided corresponding to each LED on the LED light strips; The angles are the same; at least two rows of LED strips have different light-emitting angles of the corresponding lenses.

Preferably, the light exit angle of the lens closer to the blackboard is smaller than the light exit angle of the lens farther away from the blackboard.

Preferably, two rows of LED strips and two rows of lenses are provided, the light-emitting angle of the lens closer to the blackboard is 5°-20°, and the light-emitting angle of the lens farther away from the blackboard is 5°-30°; or there are three rows of LEDs. The light strip and the three rows of lenses are from near to far away from the blackboard, and the light-emitting angles of the lenses are respectively 5°-20°, 5°-30°, and 5°-40°.

Preferably, when two rows of lenses are arranged, the light-emitting angle of the lens closer to the blackboard is 10°, and the light-emitting angle of the lens farther away from the blackboard is 16°; when three rows of lenses are arranged, the distance from the blackboard is from near to far, and the The light exit angles are 10°, 16°, and 18°, respectively.

Preferably, the light-emitting surface of the lamp body is inclined toward the blackboard.

Preferably, the inclination angle of the light-emitting surface of the lamp body is 5°.

Preferably, all lenses are provided as an integral lens board, and all LED strips are provided as an integral light source board.

Preferably, a bending transition is formed between two adjacent rows of LED light strips on the light source board by inclined planes.

Preferably, the support frame includes a transverse telescopic arm and a longitudinal telescopic arm, and the lamp body is rotatably connected to the bottom end of the longitudinal telescopic arm.

Preferably, the transverse telescopic arm includes a transverse casing and a transverse telescopic rod, and the transverse telescopic rod is slidably sheathed in the transverse casing; the longitudinal telescopic arm includes a longitudinal casing and a longitudinal telescopic rod, and the longitudinal telescopic rod is slidably sheathed in the longitudinal casing; the longitudinal casing Connected to the horizontal telescopic rod.

The beneficial effects of the present invention are as follows:

The hybrid lens combination blackboard light of the present invention uses two or more lens combinations with different light-emitting angles to uniformly irradiate the light of the corresponding LED strips on the blackboard in layers, so that the ultra-short distance of the blackboard light can be realized. Lighting to achieve high uniformity lighting effect on the blackboard. At the same time, due to the short irradiation distance, the outgoing light of the LED blackboard light cannot directly enter the human eye, which can effectively reduce the glare to teachers and students. The support frame can be lifted and retracted to meet different actual needs, and the connection between the support frame and the lamp body adopts a rotating connection to adjust the overall illumination angle of the whole lamp.

In the present invention, the center of each lens is in one-to-one correspondence with the LEDs, and the output direction is controlled to a small-angle light distribution curve that is rotationally symmetric, so that more light can fall on the blackboard, compared with the strip type in the prior art. Lens, the whole lighting efficiency is higher, the independent lens combination is more free and flexible, and the energy utilization rate is higher.

Description of drawings

1 is a schematic diagram of the present invention (the lamp body is a cross-sectional view);

Fig. 2 is the structure exploded diagram of the present invention;

3 is a schematic cross-sectional view of a lens plate provided with two rows of lenses;

4 is a schematic cross-sectional view of a lens plate provided with three rows of lenses;

5 is a light distribution curve diagram of an embodiment of a lens plate provided with two rows of lenses;

Fig. 6 is the illuminance map corresponding to the embodiment of Fig. 5;

FIG. 7 is a light distribution curve diagram of an embodiment of a lens plate provided with two rows of lenses;

Fig. 8 is the illuminance map corresponding to the embodiment of Fig. 7;

9 is a light distribution curve diagram of an embodiment of a lens plate provided with two rows of lenses;

Fig. 10 is the illuminance map corresponding to the embodiment of Fig. 9;

11 is a light distribution curve diagram of an embodiment of a lens plate provided with two rows of lenses;

Fig. 12 is the illuminance map corresponding to the embodiment of Fig. 11;

FIG. 13 is a light distribution curve diagram of an embodiment of a lens plate provided with three rows of lenses;

Fig. 14 is the illuminance map corresponding to the embodiment of Fig. 13;

Figure 15 is a schematic structural diagram of a support frame;

Figure 16 is an exploded view of the structure of the support frame;

Figure 17 is a schematic cross-sectional view of a support frame;

In the figure: 10 is a support frame, 11 is a transverse telescopic arm, 111 is a transverse sleeve, 112 is a transverse telescopic rod, 113 is a fixed sleeve, 1131 is a shrinking groove, 114 is a sealing piece, 12 is a longitudinal telescopic arm, 121 is a longitudinal sleeve, 1211 is a transverse groove, 122 is a longitudinal telescopic rod, 20 is a lamp body, 21 is a lamp holder, 22 is a light source board, 221 is an LED strip, 222 is a slope, 23 is a lens plate, and 231 is a lens.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

In order to solve the problem of uneven illumination of blackboard illumination, serious glare and other industrial problems in the prior art, the present invention provides a hybrid lens combination blackboard lamp, which uses two or more lens combinations with different light exit angles, which is relatively far away The lens of the blackboard is mainly used to illuminate the lower part of the blackboard, and the lens closer to the blackboard is mainly used to illuminate the upper part of the blackboard. Among them, the light exit angle of the lens farther away from the blackboard is smaller, and the central light intensity illuminates the lower half of the blackboard. Since the illuminance is equal to the light intensity and is inversely proportional to the square of the distance between the light source and the blackboard, the upper edge of the lower part of the blackboard is originally the position closest to the blackboard light, and the illuminance should be high, but because the small angle deviates from the center of the lens The normal angle is large, The light intensity is small, which just weakens the brightness of the upper edge of the blackboard light in the lower part, so as to achieve area lighting. The lens closer to the blackboard similarly achieves the area illumination in the upper part.

As shown in FIG. 1 and FIG. 2 , the blackboard lamp of the present invention includes a support frame 10 and a lamp body 20 . The lamp body 20 includes a lamp frame 21 and at least two rows of LED light strips 221 , corresponding to each of the LED light strips 221 . The LEDs are provided with a lens 231 ; the lenses 231 corresponding to the same row of LED strips 221 have the same light emitting angle; at least two rows of LED strips 221 have different light emitting angles of the lenses 231 corresponding to the LED strips 221 . The present invention configures a lens 231 for each LED on the LED light strip 221, so that the lighting effect of each LED can be controlled more accurately, and the effect of uniform irradiation can be achieved.

In the present invention, each row of LED light strips 221 corresponds to a horizontal area, and in order to distribute the irradiation range reasonably, the light emitting angle of the lens 231 closer to the blackboard is smaller than the light emitting angle of the lens 231 farther away from the blackboard.

In a specific implementation, when two rows of LED light strips 221 and two rows of lenses 231 are provided, as shown in FIG. 3 , the light exit angle of the lens 231 (referred to as the first angle lens) closer to the blackboard is 5° to 20°, The light exit angle of the lens 231 farther away from the blackboard (referred to as the second angle lens) is 5°˜30°.

As shown in FIG. 5 to FIG. 12 , the light exit angles of the first angle lens and the second angle lens are 10°, 16°, 8°, 10°, 10°, 10°, 16°, and 18°, respectively. It can be seen that, as a preferred embodiment, when two rows of lenses 231 are provided, the light-emitting angle of the lens 231 closer to the blackboard is 10°, and the light-emitting angle of the lens 231 farther from the blackboard is 16°.

When three rows of LED light strips 221 and three rows of lenses 231 are provided, as shown in FIG. 4 , the upper half area illumination, the middle part area illumination and the lower half area illumination are mainly formed. The light exit angles are 5° to 20°, 5° to 30°, and 5° to 40°, respectively. As a preferred embodiment, when three rows of lenses 231 are arranged, the distance from the blackboard is from near to far, and the light exit angles of the lenses 231 are respectively 10°, 16°, and 18°, as shown in FIG. 13 and FIG. 14 .

In order to better illuminate the blackboard, the light-emitting surface of the lamp body 20 is inclined toward the blackboard, and the preferred inclination angle is 5°. After the angle of the LED light strip 221 is controlled by the combination of hybrid lenses, it is irradiated obliquely on the blackboard at a close distance, which can form a uniform light spot, greatly reduce the glare to teachers and students, and effectively protect human eyesight.

In order to further prevent glare, the side wall of the light frame 21 away from the blackboard is wider than the side wall near the blackboard, and the wider side wall can be set to 20mm-200mm, preferably 90mm.

In order to facilitate assembly, all the lenses 231 are provided as an integral lens board 23, and all the LED light strips 221 are provided as an integral light source board 22, and the lens board 23 and the light source board 22 are locked together on the light frame 21. The light source board 22 and the lens board 23 can also be made into standard modules, and the modules can be installed on the lamp holder 21 in the smallest unit, so as to improve interchangeability and save maintenance costs.

Since the light-emitting angles of the lenses 231 in different rows are different, the volumes are also different. In order to better control the light, keep the lenses 231 in different rows on the same plane, then the two adjacent rows of LED strips 221 on the light source board 22 A bending transition is formed between them through the inclined surface 222, and the LED light strip 221 corresponding to the lens 231 with a larger volume is bent and retracted toward the lamp body. The purpose of the fold is to make the LEDs on the LED strip 221 closer to the lens 231 and to make the thickness of the lamp body 20 smaller.

In order to obtain softer light, the outer surface of the lens 231 may be implemented as a frosted surface.

In the present invention, in order to meet different actual requirements, the support frame 10 can be lifted and retracted, and the connection between the support frame 10 and the lamp body 20 is rotationally connected to adjust the overall illumination angle of the whole lamp. As shown in FIGS. 15 , 16 and 17 , the support frame 10 includes a horizontal telescopic wall 11 and a longitudinal telescopic wall 12 , and the lamp body 20 is rotatably connected to the bottom end of the longitudinal telescopic wall 12 . The transverse telescopic wall 11 includes a transverse sleeve 111 and a transverse telescopic rod 112, and the transverse telescopic rod 112 is slidably sleeved in the transverse sleeve 111; the longitudinal telescopic wall 12 includes a longitudinal sleeve 121, a longitudinal telescopic rod 122, and the longitudinal telescopic rod 122 slides It is sleeved in the longitudinal sleeve 121 ; the longitudinal sleeve 121 is connected to the horizontal telescopic rod 112 .

In this embodiment, the transverse sleeve 111 is a "7"-type sleeve, and the vertical side of the "7"-type sleeve is used for fixed connection with the wall. After the transverse telescopic rod 112 is sheathed in the transverse sleeve 111, it is locked by screwing in the bolt. Similarly, after the longitudinal telescopic rod 122 is sheathed in the longitudinal sleeve 121, it is locked by screwing in the bolt. The longitudinal sleeve 121 is connected with the transverse telescopic rod 112 through the fixed sleeve 113 . After one end of the fixing sleeve 113 is sleeved on the end of the horizontal telescopic rod 112, it is locked by screwing in a bolt. The top outer wall of the longitudinal sleeve 121 is symmetrically provided with a transverse groove 1211 , and the bottom surface of the fixed sleeve 113 is opened to form a constriction groove 1131 . During assembly, the transverse groove 1211 of the longitudinal sleeve 121 is slid into the constricted groove 1131, and one end of the fixed sleeve 113 is plugged with a sealing member 114. , the longitudinal sleeve 121 is positioned on the fixed sleeve 113 . After the sealing member 114 is plugged into the fixing sleeve 113, it is locked by screwing in a bolt.

The implementation of the present invention can realize that the installation distance from the blackboard is 150mm-200mm, and the best is 180mm. In the prior art blackboard light, the installation distance from the blackboard is generally 300mm-500mm.

The above-mentioned embodiments are only used to illustrate the present invention, but not to limit the present invention. As long as it is in accordance with the technical essence of the present invention, changes, modifications, etc. to the above-described embodiments will fall within the scope of the claims of the present invention.

Claims (6)

1. A mixed lens combined blackboard lamp comprises a support frame and a lamp body, and is characterized in that the lamp body comprises at least two rows of LED lamp belts, and a lens is arranged corresponding to each LED on the LED lamp belts; all the lenses are arranged into an integrated lens plate, all the LED lamp belts are arranged into an integrated light source plate, and two adjacent rows of LED lamp belts on the light source plate are bent and transited through inclined planes; the light-emitting angles of the lenses correspondingly arranged in the same row of LED lamp belts are the same; the light-emitting angles of the lenses correspondingly arranged on at least two rows of LED lamp belts are different, and the light-emitting angle of the lens closer to the blackboard is smaller than that of the lens farther from the blackboard;

when two rows of LED lamp belts and two rows of lenses are arranged, the light-emitting angle of the lens closer to the blackboard is 5-20 degrees, and the light-emitting angle of the lens farther from the blackboard is 5-30 degrees; when three rows of LED lamp belts and three rows of lenses are arranged, the distance from the blackboard is from near to far, and the light-emitting angles of the lenses are respectively 5-20 degrees, 5-30 degrees and 5-40 degrees.

2. The hybrid lens combination blackboard lamp of claim 1, wherein when two rows of lenses are provided, the light exit angle of the lens closer to the blackboard is 10 ° and the light exit angle of the lens farther from the blackboard is 16 °; when three rows of lenses are arranged, the distance from the blackboard is from near to far, and the light-emitting angles of the lenses are respectively 10 degrees, 16 degrees and 18 degrees.

3. A hybrid lens combination blackboard lamp according to claim 1, in which the light emitting face of the lamp body is inclined toward the blackboard.

4. The hybrid lens combination blackboard lamp according to claim 3, wherein the inclination angle of the light emitting surface of the lamp body is 5 °.

5. The hybrid lens combination blackboard lamp of claim 1, wherein the support frame includes a transverse telescopic arm and a longitudinal telescopic arm, and the lamp body is rotatably connected to the bottom end of the longitudinal telescopic arm.

6. The hybrid lens combination blackboard lamp of claim 5, wherein the transverse telescopic arm includes a transverse sleeve, a transverse telescopic rod slidably sleeved in the transverse sleeve; the longitudinal telescopic arm comprises a longitudinal sleeve and a longitudinal telescopic rod, and the longitudinal telescopic rod is sleeved in the longitudinal sleeve in a sliding manner; the longitudinal sleeve is connected to the transverse telescopic rod.

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