CN219177554U - Blackboard lamp - Google Patents

Abstract

The utility model relates to the field of lamp equipment, in particular to a blackboard lamp, which comprises a shell, a light source plate and a lens, wherein the cross section of the shell is V-shaped, the shell comprises a first connecting part and a second connecting part which are connected, and the first connecting part is arranged on the upper side of the second connecting part; a mounting bracket is connected between the first connecting part and the second connecting part, and two groups of light source plates are arranged at intervals in the width direction of the mounting bracket; the lens is opposite to the mounting bracket and is clamped between the first connecting part and the second connecting part, the lens comprises a first polarized lens and a second polarized lens, and the first polarized lens is opposite to the light source plate close to the first connecting part; the second polarized lens is opposite to the light source plate near the second connecting part. The shell with the V-shaped section is adopted, so that glare generated by light deflection is reduced; the arrangement of the two groups of light source plates, the first polarized lens and the second polarized lens is adopted to ensure that the upper, middle and lower areas of the illuminated object have enough illumination and uniform illumination.

Description

Blackboard lamp

Technical Field

The utility model relates to the field of lamp equipment, in particular to a blackboard lamp.

Background

Currently, a blackboard lamp is generally used in a classroom to illuminate a blackboard, and the comfort of illumination thereof has become a subject of great importance for the illumination of education in the past. Blackboard illumination is a key factor affecting classroom teaching quality, and good blackboard illumination should meet the following three requirements: (1) the device has good illumination uniformity, and avoids the interference of glare to students; (2) the enough illumination is achieved, so that students can clearly see the words on the blackboard; (3) the uncomfortable glare of teachers caused by light generated by the blackboard lamp is avoided. The traditional blackboard lamp generally only uses two fluorescent tubes to the blackboard lamp is installed in the position of blackboard oblique top, and the light that its sent mostly directly directs people's eyes, produces glare and influences people's eyesight, and this blackboard lamp is nearer above the blackboard, farther below the blackboard for the illuminance from top to bottom on blackboard surface decays gradually, and the illuminance average value on blackboard surface is lower, and this just makes current blackboard lamp have illuminance degree of consistency poor, directional controllability weak and the light utilization ratio shortcoming that is lower.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: the blackboard lamp is uniform in illumination and capable of avoiding glare.

In order to solve the technical problems, the utility model adopts the following technical scheme: the blackboard lamp comprises a shell, a light source plate and a lens, wherein the shell is in a strip shape, the cross section of the shell is in a V shape, the shell comprises a first connecting part and a second connecting part which are connected, and the first connecting part is arranged on the upper side of the second connecting part; the mounting bracket is connected between the first connecting part and the second connecting part, and the two groups of light source plates are arranged at intervals in the width direction of the mounting bracket; the lens is opposite to the mounting bracket and is clamped between the first connecting part and the second connecting part, the lens comprises a first polarized lens and a second polarized lens, and the first polarized lens is opposite to the light source plate close to the first connecting part, so that light rays are projected to the upper part and the middle part of the object to be irradiated; the second polarized lens is opposite to the light source plate close to the second connecting part, so that light rays are projected to the middle and lower areas of the object to be irradiated.

Further, the first polarized lens is a fresnel lens, and includes a first light incident side, a first texture region, a transition texture region, and a second texture region along a width direction of the first light incident side, and the first texture region

A textured region is adjacent to the first connection portion, and the width of the first textured region is greater than the width of the second textured region by 5 degrees.

Further, the second polarized lens comprises a second light incident side and a second light emergent side, the second light incident side is sequentially provided with an inclined light incident surface and a vertical light incident surface along the width direction of the second light incident side, the inclined light incident surface is inclined to the length direction of the second polarized lens, and the vertical light incident surface is vertical to the length direction of the second polarized lens;

the second light-emitting side is provided with a first light-emitting cambered surface and a second light-emitting cambered surface in sequence along the width direction of the second light-emitting side, and the bending directions of the first light-emitting cambered surface and the second light-emitting cambered surface are far away from the second light-entering side.

Further, the shell further comprises a first stop plate and a second stop plate, wherein the first stop plate is vertically connected to one end, far away from the second connecting part, of the first connecting part, and the second stop plate is obliquely connected to one end, far away from the first connecting part, of the second connecting part; the second stop plate is inclined towards the extension line of the width direction of the first stop plate.

5 further, the included angle between the light source plate near the second connecting part and the second connecting part is larger than that of the far part

And an included angle between the light source plate and the second connecting part is formed away from the second connecting part.

Further, the LED backlight module further comprises a plurality of optical reflectors, wherein the optical reflectors are sequentially arranged along the length direction of the light source plate, and the optical reflectors are arranged between the light source plate and the lens; the optical reflector is incorporated

The light source plate comprises light ends, light emitting ends and side plates, wherein the four side plates are sequentially connected end to end, one ends, close to lenses, of the four 0 side plates are combined to form a square light emitting end, and one ends, close to a light source plate, of the four side plates are combined to form a square light entering end; the light inlet end is opposite to the light source on the light source plate, and the cross-sectional area of the light inlet end is smaller than that of the light outlet end.

Further, two side plates on the optical reflector, which are positioned in the direction perpendicular to the length direction of the light source plate, are bent towards each other.

5, a locking groove parallel to the length direction of the light source plate is arranged on the mounting bracket; the optical reflectors are connected with each other, a locking bracket is formed by connecting the optical reflectors and extends towards the locking groove structurally, and the locking bracket is fixed with the locking groove through bolts.

Further, a positioning opening is formed in the light source plate, a plurality of optical reflectors are connected with each other, and a positioning column matched with the positioning opening is arranged on a structure formed by connecting the optical reflectors.

Further, the lifting support is further arranged, a sliding groove is formed in one side, far away from the mounting support, of the first connecting portion, and the lifting support moves along the length direction of the sliding groove.

The utility model has the beneficial effects that: the shell with the V-shaped section is adopted, so that the light emitted by the light source plate arranged on the mounting bracket can be guided to the opening of the V-shaped section and accurately projected on an object to be irradiated, and glare caused by light ray deviation is reduced; two groups of light source plates are respectively adopted to ensure that the upper, middle and lower areas of the illuminated object have enough illumination; and meanwhile, the first polarized lens and the second polarized lens aiming at different light source plates enable the illumination of the projection areas of the two groups of light source plates on the illuminated object to be uniform.

Drawings

Fig. 1 is a schematic structural diagram of a blackboard lamp according to a first embodiment of the present utility model;

FIG. 2 is a side view of a first embodiment of the utility model with one end cap removed;

FIG. 3 is a schematic view of the structure of the blackboard lamp according to the first embodiment of the present utility model when the mounting bracket is matched with the optical reflector;

fig. 4 is a schematic structural diagram of the light source board of the blackboard lamp according to the first embodiment of the utility model when the light source board is matched with the optical reflector.

Description of the reference numerals:

1. a housing; 11. a first connection portion; 111. a chute; 12. a second connecting portion; 13. a first cutoff plate; 14. a second cutoff plate;

2. a light source board; 21. a positioning port;

3. a first polarized lens; 31. a first textured region; 32. a transitional grain area; 33. a second textured region; 4. a second polarized lens; 41. tilting the light incident surface; 42. vertical light incidence surface; 43. a first light-emitting cambered surface; 44. a second light-emitting cambered surface;

5. a mounting bracket; 51. a locking groove; 6. an optical emitter; 61. a light inlet end; 62. a light outlet end; 63. a side plate; 64. a locking bracket; 65. positioning columns; 7. hoisting the bracket;

Detailed Description

In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.

Referring to fig. 1 to 4, a blackboard lamp includes a housing 1, a light source plate 2 and a lens, wherein the housing 1 is in a strip shape, a cross section of the housing is in a V shape, the housing 1 includes a first connecting portion 11 and a second connecting portion 12 connected with each other, and the first connecting portion 11 is disposed above the second connecting portion 12; the mounting bracket 5 is connected between the first connecting part 11 and the second connecting part 12, and the two groups of light source plates 2 are arranged at intervals in the width direction of the mounting bracket 5; the lens is opposite to the mounting bracket 5 and is clamped between the first connecting part 11 and the second connecting part 12, the lens comprises a first polarized lens 3 and a second polarized lens 4, and the first polarized lens 3 is opposite to the light source plate 2 close to the first connecting part 11, so that light rays are projected to the upper part and the middle part of an object to be irradiated; the second polarized lens 4 is opposite to the light source plate 2 near the second connection portion 12, so that light is projected on the middle and lower regions of the illuminated object.

From the above description, the beneficial effects of the utility model are as follows: the shell 1 with the V-shaped section is arranged so that the light emitted from the built-in light source plate 2 can be guided to the opening of the V-shaped section and accurately projected on an object to be irradiated, and glare caused by light deflection is reduced; two groups of light source plates 2 are respectively adopted to ensure that the upper, middle and lower areas of the illuminated object have enough illumination; the arrangement of the first polarized lens 3 and the second polarized lens 4 aiming at different light source plates 2 simultaneously makes the illumination of the projection area of the two groups of light source plates 2 on the illuminated object uniform.

Further, the first polarized lens 3 is a fresnel lens, and includes a first light incident side, the first light incident side includes a first textured area 31, a transition textured area 32, and a second textured area 33 along a width direction thereof, the first textured area 31 is close to the first connection portion 11, and a width of the first textured area 31 is greater than a width of the second textured area 33.

As can be seen from the above description, the fresnel lens is designed to converge the incident light, and generate a great light intensity to ensure illuminance of an illuminated area on the illuminated object; meanwhile, the first texture area 31 is larger than the second texture area 33, as the first texture area 31 is close to the first connecting portion 11, light refracted by the first texture area 31 is projected to the upper portion of the object to be irradiated, excessive refraction angles are not needed, the width of the first texture area 31 and the width of the second texture area 33 are set so that the angle of light refracted by the first texture area can be influenced, the larger the texture width is, the more gentle the surface gradient is, and the lower the light refraction effect is. The angle adjustment to the light path can be realized through the different designs of the width to first line region 31 and second line region 33, for the second light source board 2 needs the polarizing of wide-angle to satisfy the projection of the lower part in the object that is shone, forms the polarizing effect of low-angle.

Further, the second polarized lens 4 includes a second light incident side and a second light emergent side, the second light incident side is sequentially provided with an inclined light incident surface 41 and a vertical light incident surface 42 along the width direction thereof, the inclined light incident surface 41 is inclined to the length direction of the second polarized lens 4, and the vertical light incident surface 42 is perpendicular to the length direction of the second polarized lens 4; the second light emitting side is sequentially provided with a first light emitting cambered surface 43 and a second light emitting cambered surface 44 along the width direction thereof, and the bending directions of the first light emitting cambered surface 43 and the second light emitting cambered surface 44 are far away from the second light entering side.

As can be seen from the above description, the inclined light incident surface 41 and the vertical light incident surface 42 of the second light incident side form a step microstructure, and the first light emergent cambered surface 43 and the second light emergent cambered surface 44 of the second light emergent side form a free-form surface structure; the combination of the two structures can enable the light to form a deflection effect with a larger angle, and the light is deflected out from the part to be projected to the middle and lower areas of the object to be irradiated.

Further, the housing 1 further comprises a first stop plate 13 and a second stop plate 14, wherein the first stop plate 13 is vertically connected to one end of the first connecting portion 11 far away from the second connecting portion 12, and the second stop plate 14 is obliquely connected to one end of the second connecting portion 12 far away from the first connecting portion 11; the second cutoff plate 14 is inclined toward the extension line of the width direction of the first cutoff plate 13.

As is apparent from the above description, the light emitted from the light source plate 2 is blocked and guided by the arrangement of the first blocking plate 13 and the second blocking plate 14, respectively; specifically, the first blocking plate 13 perpendicular to the first connection portion 11, since the lamp is generally disposed on the upper side of the illuminated object as a whole, the projected light at the first connection portion 11 cannot illuminate the illuminated object, and is blocked by the first blocking plate 13 to be reflected and re-refracted to be projected onto the illuminated object; the second cutoff plate 14 is used for preventing the light from projecting downwards to cause glare interference to people close to the illuminated object, and the inclined second cutoff plate 14 guides part of the light to the illuminated object.

Further, the included angle between the light source board 2 and the second connection portion 12 near the second connection portion 12 is larger than the included angle between the light source board 2 and the second connection portion 12 far from the second connection portion 12.

As can be seen from the above description, the two sets of light source plates 2 are inclined at different angles, and the light output in different areas of the illuminated object can be controlled by the different inclined angle settings, so as to improve the light utilization rate and the uniformity of the blackboard lamp.

Further, the light source plate further comprises a plurality of optical reflectors, the optical reflectors are sequentially arranged along the length direction of the light source plate 2, and the optical reflectors are arranged between the light source plate 2 and the lens; the optical reflector comprises light inlet ends 61, light outlet ends 62 and side plates 63, wherein four side plates 63 are sequentially connected end to end, one end, close to a lens, of each side plate 63 is combined to form a square light outlet end 62, and one end, close to a light source plate 2, of each side plate 63 is combined to form a square light inlet end 61; the light inlet end 61 is opposite to the light source on the light source plate 2, and the cross-sectional area of the light inlet end 61 is smaller than the cross-sectional area of the light outlet end 62.

As is apparent from the above description, the optical reflector serves to internally reflect the light emitted from the light source plate 2 a plurality of times to thereby achieve light mixing, so that the light emitted from the light emitting end 62 is uniform. In addition, under the condition of using a plurality of LEDs with different colors, the light mixing among the different colors can be uniform without obvious chromatic aberration. Secondly, by the arrangement of the connection shapes of the light inlet end 61, the light outlet end 62 and the side plate 63, the angle of the emitted light can be controlled within a range, the boundary formed by the light is square, the boundary is a bright illumination spot, and the illumination light cannot be obtained outside the boundary, so that the sharp cut-off is generated. Therefore, the light emitted from the light source plate 2 is first cut off and controlled in the interior, and glare is further controlled.

Further, two side plates 63 of the optical reflector, which are positioned in a direction perpendicular to the length direction of the light source plate 2, are bent toward each other.

As is apparent from the above description, the light uniformity of the light-emitting end 62 is further improved by the arrangement of the opposite bends of the partial side plates 63 to enhance the multiple reflection effect of the light within the optical emitter 6.

Further, the mounting bracket 5 is provided with a locking groove 51 parallel to the length direction of the light source plate 2; the optical reflectors are connected with each other, and the locking brackets 64 are extended toward the locking grooves 51 from a structure formed by connecting the optical reflectors 6, and the locking brackets 64 are fixed with the locking grooves 51 by bolts.

As is clear from the above description, the plurality of optical transmitters 6 are quickly and equally fixed by the locking fixing arrangement of the locking groove 51 of the mounting bracket 5 and the locking bracket 64.

Further, the light source plate 2 is provided with a positioning hole 21, a plurality of optical reflectors are connected with each other, and a positioning post 65 matched with the positioning hole 21 is arranged corresponding to the positioning hole 21 in a structure formed by connecting a plurality of optical emitters 6.

As can be seen from the above description, the positioning of the light source plate 2 and the optical reflector is ensured by the cooperation of the positioning hole 21 of the light source plate 2 and the positioning post 65.

Further, the device further comprises a hoisting support 7, a chute 111 is arranged on one side of the first connecting portion 11 away from the mounting support 5, and the hoisting support 7 moves along the length direction of the chute 111.

As can be seen from the above description, the movable lifting bracket 7 is disposed with the chute 111 of the first connecting portion 11, so that the lifting bracket 7 can slide freely, and the lifting of the projector or other teaching apparatus is prevented from being affected.

Referring to fig. 1 to 4, a first embodiment of the present utility model is:

the application scene of the utility model is as follows: in the design of classroom blackboard lamp, traditional blackboard lamp produces glare easily and influences people's eyesight, and this blackboard lamp is nearer above the blackboard, is farther below the blackboard for the illuminance on blackboard surface from top to bottom decays gradually, and the illuminance average value on blackboard surface is lower.

As shown in fig. 1 to 4, the blackboard lamp of the present embodiment, a housing 1, a light source plate 2, a lens, a plurality of optical reflectors, a hanging bracket 7, and a power source.

As shown in fig. 1, the casing 1 is in a strip shape, the cross section of the casing is in a V shape, the surface treatment such as electrostatic spraying, aluminizing, chrome plating and the like can be performed on the inner side surface of the casing 1, the light ray path is changed and reflected to the upper or lower part of the blackboard or the wall body, the upper and lower parts of the blackboard or the wall body are supplemented with light, and the illuminance uniformity of the blackboard or the wall body is improved. End covers are arranged at two ends of the shell 1 in the length direction, the end covers are punched by cold-rolled sheets SPCC, and the surface treatment is consistent with the inner side surface of the shell 1. The end cover is also used as a light interception design, so that light rays of a side view angle are intercepted, and the light rays are prevented from directly entering eyes.

As shown in fig. 2, the housing 1 includes a first cutoff plate 13, a second cutoff plate 14, a first connecting portion 11 and a second connecting portion 12 connected.

The first connecting part 11 is arranged on the upper side of the second connecting part 12, specifically, the first connecting part 11 is in a horizontal structure, and the second connecting part 12 is in a vertical structure; a first stop plate 13 is vertically connected to one end of the first connecting portion 11 away from the second connecting portion 12, and a second stop plate 14 is obliquely connected to one end of the second connecting portion 12 away from the first connecting portion 11; the second cutoff plate 14 is inclined toward the extension line of the width direction of the first cutoff plate 13.

Specifically, the second cutoff plate 14 has an included angle α with the normal line of the vertical downward, that is, the included angle α with the second connecting portion 12 ranges from 25 ° < α < 45 °; the extension dimension of the second cutoff plate 14, i.e. the width dimension a of the second cutoff plate 14, ranges from 6mm < a < 10mm. Light is cut off through two kinds of cut-off structural designs, the light below the blackboard lamp when people stand in front of the blackboard or the wall is shielded, glare caused by direct light entering eyes is prevented, and the protection effect on eyes is achieved.

The mounting bracket 5 is connected between the first connecting part 11 and the second connecting part 12, a sliding groove 111 is arranged on one side, away from the mounting bracket 5, of the first connecting part 11, and the lifting bracket 7 moves along the length direction of the sliding groove 111. The lifting support 7 is a bolt type lifting support 7, and quick installation, maintenance and replacement can be realized.

The power supply is arranged on one side of the first connecting part 11, which is far away from the mounting bracket 5, is electrically connected with the light source plate 2, is a device for providing power for the LED light source, converts the power supply into specific voltage and current to drive the LED light source to emit light, can change the voltage along with the change of the forward voltage drop value of the LED, and has the characteristics of high reliability, high efficiency, high power factor, surge protection, short circuit protection and the like.

The light source plates 2 are also in a strip shape, two groups of light source plates 2 are arranged at intervals in the width direction of the mounting bracket 5, and an included angle between the light source plate 2 close to the second connecting portion 12 and the second connecting portion 12 is larger than an included angle between the light source plate 2 far away from the second connecting portion 12 and the second connecting portion 12. Meanwhile, in order to satisfy the illuminance and uniformity of the illuminated area of the illuminated object, the energy ratio emitted by the LED light source on the light source board 2 near the first connection portion 11 and the LED light source on the light source board 2 near the second connection portion 12 is 1:2, when the current passed by each LED light source is the same, it can be equivalent to a total number ratio of LED light sources on the light source board 2 near the first connection portion 11 to the total number of LED light sources on the light source board 2 near the second connection portion 12 of 1:2.

the lens is opposite to the mounting bracket 5 and is clamped between the first connecting part 11 and the second connecting part 12, the lens is in a strip shape, the lens comprises a first polarized lens 3 and a second polarized lens 4, the first polarized lens 3 is opposite to the light source plate 2 close to the first connecting part 11, so that light rays are projected on the upper part and the middle part of an object to be irradiated; the second polarized lens 4 is opposite to the light source plate 2 near the second connection portion 12, so that light is projected on the middle and lower regions of the illuminated object.

Wherein the projection of the end cover in the length direction of the housing 1 covers the lens, the projection of the connecting part of the first stop plate 13 and the first connecting part 11 coincides with the projection of the end cover, and the projection of the second stop plate 14 does not coincide with the projection of the end cover.

The first polarized lens 3 is a fresnel lens, and includes a first light incident side, where the first light incident side includes a first texture area 31, a transition texture area 32, and a second texture area 33 along a width direction thereof, the first texture area 31 is close to the first connection portion 11, and a width of the first texture area 31 is greater than a width of the second texture area 33. Specifically, in the present embodiment, the transition textured region 32 is not located on the middle line between the first textured region 31 and the second textured region 33, but is offset towards the second textured region 33, and the design also performs polarization treatment on the light.

The existence of the lens lines is provided with lines with specified cross-sectional shapes, so that light rays can be refracted towards a specified direction, namely, polarized light can be carried out towards a preset direction. The lens lines are in a straight line trend, extend along the length direction of the lens, and can determine the polarization direction and degree of light according to the setting mode of the lens lines, including but not limited to the parameters of width, height, shape and the like of each lens line.

The second polarized lens 4 includes a second light incident side and a second light emergent side, the second light incident side is sequentially provided with an inclined light incident surface 41 and a vertical light incident surface 42 along the width direction thereof, the inclined light incident surface 41 is inclined to the length direction of the second polarized lens 4, and the vertical light incident surface 42 is perpendicular to the length direction of the second polarized lens 4; the second light emitting side is sequentially provided with a first light emitting cambered surface 43 and a second light emitting cambered surface 44 along the width direction thereof, and the bending directions of the first light emitting cambered surface 43 and the second light emitting cambered surface 44 are far away from the second light entering side. Specifically, in the embodiment, the structural centers of the second light incident side and the second light emergent side are offset from the central line of the LED light source to a certain extent, which can make the light form a larger angle deflection effect.

As shown in fig. 3 and 4, a plurality of optical reflectors are sequentially arranged along the length direction of the light source plate 2, and the optical reflectors are arranged between the light source plate 2 and the lens; the optical reflector comprises a light inlet end 61, a light outlet end 62 and side plates 63, wherein four side plates 63 are connected end to end in sequence, and two side plates 63 positioned in the direction vertical to the length direction of the light source plate 2 are bent in opposite directions; one end of each side plate 63 close to the lens is combined to form a square light emitting end 62, and one end of each side plate 63 close to the light source plate 2 is combined to form a square light entering end 61; the light inlet end 61 is opposite to the light source on the light source plate 2, and the cross-sectional area of the light inlet end 61 is smaller than the cross-sectional area of the light outlet end 62. Specifically, the size of the light emitting end 62 of the optical reflector is 14.98×16.00mm, the size of the light entering end 61 is adjusted according to the packaging specification of the LED light source on the selected light source board 2, and the size relationship is as follows: l is less than or equal to 2.5 and less than or equal to 3, W is less than or equal to 1.5 and less than or equal to 2.5, wherein L, W is the length and width of the bottom opening of the optical reflector, and L and W are the length and width of the package size of the LED light source.

When the LED light source package size is selected to be 3528, the optical reflector bottom end length and width dimensions are 9.96×5.60mm (defined as long along the length direction of the light source plate 2 and as wide along the width direction of the light source plate 2, as follows).

In this embodiment, the light source board 2 is provided with a plurality of rows of two LED light sources, so that one optical reflector is opposed to one group of two LED light sources.

The mounting bracket 5 is provided with a locking groove 51 parallel to the length direction of the light source plate 2; the optical reflectors are connected with each other, and the locking brackets 64 are extended toward the locking grooves 51 from a structure formed by connecting the optical reflectors 6, and the locking brackets 64 are fixed with the locking grooves 51 by bolts.

In the positioning design of the light source plate 2 and the optical reflectors, the light source plate 2 is provided with a positioning opening 21, a plurality of optical reflectors are connected with each other, and a plurality of optical emitters 6 are connected to form a structure, and positioning columns 65 matched with the positioning opening 21 are arranged corresponding to the positioning opening 21.

The working principle of the utility model is as follows: the blackboard lamp is arranged on the upper side of an object to be irradiated, the object to be irradiated takes a blackboard as an example, two groups of light source plates 2, a first polarized lens 3 and a second polarized lens 4 are respectively adopted, and the high-illumination high-uniformity irradiation of multiple parts on the upper, middle and lower parts of the blackboard is realized through the position arrangement of the light source plates 2 and the matching of the light source plates and different polarized lens types.

Meanwhile, the arrangement of the optical reflector, the first cutoff plate 13, the second cutoff plate 14 and the end cover is adopted, the light emitted from the light source plate 2 is cut off for multiple times in multiple directions, and the V-shaped section design of the shell 1 is combined, so that the light direction controllability is high, the light utilization rate is high, and the anti-dazzle effect is good.

In summary, according to the blackboard lamp provided by the utility model, the shell with the V-shaped section is adopted, so that the light emitted by the light source plate arranged on the mounting bracket can be guided to the opening of the V-shaped section and accurately projected on an object to be irradiated, and glare caused by light deflection is reduced; two groups of light source plates are respectively adopted to ensure that the upper, middle and lower areas of the illuminated object have enough illumination; and meanwhile, the first polarized lens and the second polarized lens aiming at different light source plates enable the illumination of the projection areas of the two groups of light source plates on the illuminated object to be uniform.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.

Claims (10)

1. The blackboard lamp is characterized by comprising a shell, a light source plate and a lens, wherein the shell is in a strip shape, the cross section of the shell is in a V shape, the shell comprises a first connecting part and a second connecting part which are connected, and the first connecting part is arranged on the upper side of the second connecting part; the mounting bracket is connected between the first connecting part and the second connecting part, and the two groups of light source plates are arranged at intervals in the width direction of the mounting bracket; the lens is opposite to the mounting bracket and is clamped between the first connecting part and the second connecting part, the lens comprises a first polarized lens and a second polarized lens, and the first polarized lens is opposite to the light source plate close to the first connecting part, so that light rays are projected to the upper part and the middle part of the object to be irradiated; the second polarized lens is opposite to the light source plate close to the second connecting part, so that light rays are projected to the middle and lower areas of the object to be irradiated.

2. The blackboard lamp according to claim 1, wherein the first polarized lens is a fresnel lens, and includes a first light incident side, the first light incident side has a first textured area, a transition textured area and a second textured area along a width direction thereof, the first textured area is close to the first connection portion, and a width of the first textured area is greater than a width of the second textured area.

3. The blackboard lamp according to claim 1, wherein the second polarized lens includes a second light incident side and a second light emergent side, the second light incident side is sequentially provided with an inclined light incident surface and a vertical light incident surface along a width direction thereof, the inclined light incident surface is inclined to a length direction of the second polarized lens, and the vertical light incident surface is perpendicular to the length direction of the second polarized lens; the second light-emitting side is provided with a first light-emitting cambered surface and a second light-emitting cambered surface in sequence along the width direction of the second light-emitting side, and the bending directions of the first light-emitting cambered surface and the second light-emitting cambered surface are far away from the second light-entering side.

4. The blackboard lamp according to claim 1, wherein the housing further includes a first cutoff plate and a second cutoff plate, the first cutoff plate is vertically connected to an end of the first connecting portion away from the second connecting portion, and the second cutoff plate is obliquely connected to an end of the second connecting portion away from the first connecting portion; the second stop plate is inclined towards the extension line of the width direction of the first stop plate.

5. The blackboard lamp according to claim 1, wherein an angle between the light source board near the second connection portion and the second connection portion is larger than an angle between the light source board far from the second connection portion and the second connection portion.

6. The blackboard lamp according to claim 1, further comprising a plurality of optical reflectors, the plurality of optical reflectors being disposed in sequence along the length of the light source plate, the optical reflectors being disposed between the light source plate and the lens; the optical reflector comprises light-in ends, light-out ends and side plates, wherein the four side plates are sequentially connected end to end, one ends of the four side plates, which are close to the lenses, are combined to form square light-out ends, and one ends of the four side plates, which are close to the light source plates, are combined to form square light-in ends; the light inlet end is opposite to the light source on the light source plate, and the cross-sectional area of the light inlet end is smaller than that of the light outlet end.

7. The blackboard lamp according to claim 6, wherein the two side plates of the optical reflector, which are located in a direction perpendicular to the length direction of the light source plate, are bent toward each other.

8. The blackboard lamp according to claim 6, wherein the mounting bracket is provided with a locking groove parallel to the length direction of the light source plate; the optical reflectors are connected with each other, a locking bracket is formed by connecting the optical reflectors and extends towards the locking groove structurally, and the locking bracket is fixed with the locking groove through bolts.

9. The blackboard lamp according to claim 6, wherein the light source board is provided with a positioning hole, a plurality of the optical reflectors are connected with each other, and a plurality of optical emitters are connected to form a structure corresponding to the positioning hole and provided with a positioning column matched with the positioning hole.

10. The blackboard lamp according to claim 1, further comprising a hanging bracket, wherein a chute is provided on a side of the first connecting portion away from the mounting bracket, and the hanging bracket moves along a length direction of the chute.

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