CN107740957B

CN107740957B - Mixed lens combination blackboard lamp

Info

Publication number: CN107740957B
Application number: CN201710686245.8A
Authority: CN
Inventors: 颜稳萍; 马永墩; 林建鑫
Original assignee: Xiamen Lidaxin Lighting Co ltd
Current assignee: Xiamen Lidaxin Lighting Co ltd
Priority date: 2017-08-11
Filing date: 2017-08-11
Publication date: 2020-10-20
Anticipated expiration: 2037-08-11
Also published as: CN107740957A

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

Mixed lens combination blackboard lamp

Technical Field

The invention relates to the field of education illumination, in particular to a mixed lens combined blackboard lamp.

Background

Traditional classroom blackboard illumination adopts traditional T8 fluorescent tube, and the light of T8 pipe is directly and indirectly reflected to the blackboard face through large-area bowl, in order to cover whole blackboard with light, then need set up lamps and lanterns in more long-range distance, through the long-range blackboard that shines, can just illuminate whole blackboard.

However, long-distance illumination easily causes light to directly enter the eyes of the teacher, and serious glare is caused to the teacher.

With the rapid development of LED illumination, an LED blackboard lamp is also produced, but the common LED blackboard lamp adopts an optical mode of a strip-shaped lens or a single-lens multi-head combination, but the optical schemes always need long-distance illumination to illuminate the whole blackboard, and because the LED emits light in a point manner, the light intensity is stronger than that of a T8 lamp tube, so that the glare is heavier.

For example, the chinese patent application 201710113940.5 proposes an LED blackboard lamp with high brightness and uniformity, which includes: lamp support, light source subassembly, the light source subassembly includes: the LED lamp comprises an aluminum-type mounting strip, an LED lamp bar, a lens and adjusting end covers, wherein the LED lamp bar, the lens and the adjusting end covers are sleeved and embedded in the aluminum-type mounting strip along the length direction of the aluminum-type mounting strip; the LED lamp strip and the lens are correspondingly installed, high-light-guiding semi-solid semi-liquid silica gel capable of improving light efficiency is filled between the LED lamp strip and the lens, one surface of the lens, which faces the LED lamp strip, is provided with a prismatic surface, and the other opposite surface is formed with a frosted arc-shaped surface.

Therefore, the invention still has the defects that long-distance illumination is needed, and the glare is more serious.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a mixed lens combined blackboard lamp which realizes short-distance illumination, uniform illumination and glare avoidance.

The technical scheme of the invention is as follows:

a mixed lens combined blackboard lamp comprises a support frame and a lamp body, wherein 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; 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.

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

Preferably, 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 away from the blackboard is 5-30 degrees; or 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.

Preferably, when two rows of lenses are arranged, the light-emitting angle of the lens closer to the blackboard is 10 degrees, and the light-emitting angle of the lens farther from the blackboard is 16 degrees; 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.

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

Preferably, the light emitting surface of the lamp body is inclined at an angle of 5 °.

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

Preferably, the two adjacent rows of LED lamp belts on the light source board form bending transition through inclined planes.

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

Preferably, the transverse telescopic arm comprises a transverse sleeve and a transverse telescopic rod, and the transverse telescopic rod is sleeved in the transverse sleeve in a sliding manner; 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.

The invention has the following beneficial effects:

the mixed lens combined blackboard lamp uses two or more lens combinations with different light-emitting angles to uniformly irradiate light rays of the corresponding LED lamp belts on the blackboard in a layered mode, super-short-distance illumination of the blackboard lamp can be achieved, and the effect of high-uniformity illumination of the blackboard is achieved. 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.

Drawings

FIG. 1 is a schematic view of the present invention (with the lamp body in cross-section);

FIG. 2 is an exploded view of the structure of the present invention;

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

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

FIG. 5 is a light distribution graph of one embodiment of a lens plate having two rows of lenses;

FIG. 6 is a graph of luminance corresponding to the embodiment of FIG. 5;

FIG. 7 is a light distribution graph of one embodiment of a lens plate having two rows of lenses;

FIG. 8 is a graph of luminance corresponding to the embodiment of FIG. 7;

FIG. 9 is a light distribution graph of an embodiment of a lens plate having two rows of lenses;

FIG. 10 is a graph of luminance corresponding to the embodiment of FIG. 9;

FIG. 11 is a light distribution graph of one embodiment of a lens plate with two rows of lenses;

FIG. 12 is a graph of luminance corresponding to the embodiment of FIG. 11;

FIG. 13 is a light distribution graph of one embodiment of a lens plate with three rows of lenses;

FIG. 14 is a graph of illuminance corresponding to the embodiment of FIG. 13;

FIG. 15 is a schematic structural view of the support frame;

FIG. 16 is an exploded view of the structure of the support bracket;

FIG. 17 is a cross-sectional schematic view of the 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 necking 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 plate, 221 is an LED lamp strip, 222 is an inclined plane, 23 is a lens plate, and 231 is a lens.

Detailed Description

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

The invention provides a mixed lens combined blackboard lamp for solving the industrial problems of uneven illumination, serious glare and the like of the blackboard illumination in the prior art, wherein two or more lenses with different light-emitting angles are combined, so that the lens far away from the blackboard is mainly used for illuminating the lower part area of the blackboard, and the lens closer to the blackboard is mainly used for illuminating the upper part area of the blackboard. The light-emitting angle of the lens far away from the blackboard is smaller, the central light intensity irradiates the lower half part area of the blackboard, and the light distribution curve of the lens is that the larger the angle of the lens deviated from the central normal line is, the smaller the light intensity is. Because the illumination is equal to the light intensity and is inversely proportional to the square of the distance between the light source and the blackboard, the illumination should be high at the position where the upper edge of the lower part of the blackboard is closest to the blackboard lamp, but the brightness of the upper edge of the blackboard lamp of the lower part is just weakened due to the fact that the small angle deviates from the normal line of the center of the lens by a large angle and the light intensity is small, and therefore area illumination is achieved. The lenses closer to the blackboard similarly effect illumination of the upper part of the area.

As shown in fig. 1 and 2, the blackboard lamp of the present invention includes a support frame 10 and a lamp body 20, wherein the lamp body 20 includes a lamp holder 21 and at least two rows of LED strips 221, and a lens 231 is disposed corresponding to each LED on the LED strips 221; the light-emitting angles of the lenses 231 correspondingly arranged in the same row of the LED lamp strips 221 are the same; the light-emitting angles of the lenses 231 correspondingly arranged in at least two rows of the LED strips 221 are different. According to the invention, each LED on the LED lamp strip 221 is provided with the lens 231, so that the illumination effect of each LED is more accurately controlled, and the uniform illumination effect can be achieved.

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

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

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

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

For better illuminating the blackboard, the light emitting surface of the lamp body 20 is inclined toward the blackboard, preferably at an angle of 5 °. After the LED lamp strip 221 is subjected to angle control through the mixed lens combination, the LED lamp strip obliquely irradiates on the blackboard surface at a close distance, so that uniform light spots can be formed, glare to teachers and students is greatly reduced, and the eyesight of people is effectively protected.

To further prevent glare, the lamp holder 21 is wider at the side wall away from the blackboard than at the side wall close to the blackboard, and the wider side wall can be set to 20mm to 200mm, preferably 90 mm.

For the convenience of assembly, all the lenses 231 are provided as an integral lens plate 23, all the LED strips 221 are provided as an integral light source plate 22, and the lens plate 23 and the light source plate 22 are locked on the lamp holder 21 together. The light source plate 22 and the lens plate 23 can be made into standard modules, and the modules can be installed on the lamp holder 21 by taking the modules as the minimum unit, so that the interchangeability is improved, and the maintenance cost is saved.

Because the light-emitting angles of the lenses 231 in different rows are different, the volumes are also different, in order to better control light, the lenses 231 in different rows are kept on the same plane, and then the two rows of adjacent LED strips 221 on the light source board 22 form bending transition through the inclined plane 222, the LED strips 221 corresponding to the lenses 231 with larger volumes are bent and retracted towards the inside of the lamp body, otherwise, the LED strips 221 corresponding to the lenses 231 with smaller volumes are bent and protruded towards the outside of the lamp body, so that the purpose is to make the LEDs on the LED strips 221 closer to the lenses 231 and 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 invention, in order to adapt to different actual requirements, the support frame 10 can be lifted and stretched, and the connection part of the support frame 10 and the lamp body 20 is rotatably connected to adjust the integral irradiation angle of the whole lamp. As shown in fig. 15, 16 and 17, the support frame 10 includes a transverse 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 comprises a transverse sleeve 111 and a transverse telescopic rod 112, and the transverse telescopic rod 112 is sleeved in the transverse sleeve 111 in a sliding manner; the longitudinal telescopic wall 12 comprises a longitudinal sleeve 121 and a longitudinal telescopic rod 122, and the longitudinal telescopic rod 122 is slidably sleeved in the longitudinal sleeve 121; the longitudinal sleeve 121 is connected to the transverse expansion rod 112.

In this embodiment, the transverse sleeve 111 is a "7" sleeve, and the vertical edge of the "7" sleeve is used for being fixedly connected with the wall. After the transverse telescopic rod 112 is sleeved in the transverse sleeve 111, the bolt is screwed in for locking. Similarly, after the longitudinal extension rod 122 is sleeved in the longitudinal sleeve 121, it is screwed in by a bolt for locking. The longitudinal sleeve 121 is connected to the transverse expansion rod 112 by means of a fixed sleeve 113. One end of the fixed sleeve 113 is sleeved on the end of the transverse telescopic rod 112 and then screwed in by a bolt for locking. The top outer wall of the longitudinal sleeve 121 is symmetrically provided with a transverse groove 1211, and the bottom surface of the fixing sleeve 113 is opened to form a necking groove 1131. During assembly, the transverse slot 1211 of the longitudinal sleeve 121 is slid into alignment with the necking slot 1131, one end of the fixed sleeve 113 is plugged with the sealing member 114, and the sealing member 114 and the transverse telescopic rod 112 form a two-end abutment against the longitudinal sleeve 121, so as to position the longitudinal sleeve 121 on the fixed sleeve 113. The sealing member 114 is inserted into the fixing sleeve 113 and then screwed in by a bolt to be locked.

The invention can realize the installation distance of 150mm-200mm, preferably 180mm, with the blackboard. The installation distance between the blackboard lamp and the blackboard in the prior art is generally 300mm-500 mm.

The above examples are provided only for illustrating the present invention and are not intended to limit the present invention. Changes, modifications, etc. to the above-described embodiments are intended to fall within the scope of the claims of the present invention as long as they are in accordance with the technical spirit of the present invention.

Claims

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.