CN211146204U - Blackboard L ED lighting device capable of reducing glare value - Google Patents

Abstract

The utility model discloses a can reduce blackboard L ED lighting device of dizzy light value, which comprises an outer shell, L ED lamp strip, L ED lamp strip includes the base plate, L ED lamp pearl on the base plate, the shell includes the rectangular shape casing that comprises aluminum alloy ex-trusions, the closing cap at casing both ends, the casing front side is equipped with along the opening, the opening part is equipped with reflection grid, reflection grid includes two fixed strakes along opening both sides longitudinal extension, connect the parting bead between two fixed strakes, thereby separate out a plurality of light-emitting grids between two fixed strakes, the both sides face of parting bead includes reflecting surface and lower reflecting surface respectively, it is the plane to go up the reflecting surface, the cross section of lower reflecting surface is the part of the downward parabola of opening, distance between two adjacent parting beads is L, the height of parting bead is H, and 0.6 be less than or equal to H/L be less than or equal to 0.8, the utility model discloses when guaranteeing blackboard illuminance, can show the reduction to teacher's comfort level, promote teacher's vision.

Description

Blackboard L ED lighting device capable of reducing glare value

Technical Field

The utility model relates to the technical field of lighting technology, concretely relates to can reduce blackboard L ED lighting device of dizzy light value.

Background

It is known that, in the prior art, for the illumination of the blackboard in the classroom, people usually adopt a common fluorescent tube, which has mature technology and moderate price, but has the following defects that firstly, the fluorescent tube has a stroboscopic phenomenon during working, which can negatively affect the eyesight, and secondly, the fluorescent tube needs to be matched with a rectifier, a starter and the like, which causes inconvenience in installation and use. In particular, since the writing board has a long lateral length, when the light of the fluorescent lamp tube horizontally installed is projected downward onto the writing board, the problems of light in the middle and dark on both sides of the writing board are caused, so that the illuminance of the light on the writing board in the longitudinal direction is not uniform, thereby adversely affecting the eyesight of people.

As economy and lighting technology develop, various L ED lamps are more and more popular, and people design an elongated L ED lamp to replace the existing fluorescent lamp tube used for lighting a writing board, thereby achieving good energy-saving effect and being beneficial to eliminating the problem of 'stroboscopic' of the fluorescent lamp tube, but the existing elongated L ED lamp has the defects that people usually coaxially install 2-3 elongated L ED illuminating lamps at the front upper part of the blackboard, and the L ED lamp usually comprises a diffusion plate so as to enlarge the illuminating area and soften the light.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that the current L ED lamps and lanterns that are used for the blackboard illumination exist easily forms glare effect, influence teacher's vision and vision comfort level to the teacher, provide a can reduce blackboard L ED lighting device of glare value, when guaranteeing blackboard illuminance, can show the ground and reduce the glare value to the teacher, promote teacher's vision comfort level.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a blackboard L ED lighting device capable of reducing glare value comprises a shell and a L ED lamp strip arranged in the shell, wherein the L ED lamp strip comprises an elongated base plate and a plurality of L ED lamp beads arranged on the base plate, the shell comprises an elongated shell formed by aluminum alloy extrusion molding and covers detachably arranged at two ends of the shell, an opening extending along the longitudinal direction is arranged on the front side of the shell, a light emitting area is formed by the opening, a reflection grating is arranged in the light emitting area and comprises two fixing edge strips extending along the longitudinal direction of two sides of the opening and a separation strip connected between the two fixing edge strips, so that the two side faces of the separation strip are separated into the light emitting gratings, the two side faces of the separation strip respectively comprise an upper reflection face at the upper part and a lower reflection face at the lower part, the upper reflection face is a plane, the cross section of the lower reflection face is a part of a parabola with the downward opening, the distance between every two adjacent separation strips is L, the height of the separation strip is H, and H/L is not less.

It is known to place 2-3L ED lighting devices above the front of a classroom board so that the L ED lighting device adequately illuminates the entire board, which is about 4 meters wide.

The utility model discloses the downside at the casing goes out the reflection grid that the light zone set up the light-emitting grid including a plurality of rectangles, wherein the parting bead of reflection grid both sides can reflect the light that L ED lamp strip sent, thereby control light component distribution effectively, make light concentrate shine on the blackboard, wherein go up the plane of reflection and can reflect the back to the side direction light of L ED lamp strip and jet out from going out the light zone, and form the scattered light on a relatively large scale, be favorable to improving the soft degree of light, avoid excessive light to cause amazing to eyes, and the plane of reflection then can be with light downward reflection to the blackboard down, be favorable to improving the luminance of blackboard.

Because the cross section of the lower reflecting surface is a part of a parabola with a downward opening, namely, the lower reflecting surface is a paraboloid, most of light rays emitted by the L ED lamp strip can be emitted downwards and irradiate the blackboard after being reflected by the lower reflecting surface by virtue of the 'light condensation effect' of the paraboloid, so that the illuminance of the blackboard can be improved, and the adverse effect of horizontal glare on the vision of a teacher can be avoided.

When a teacher stands in the middle of a platform and looks sideways at a blackboard, light rays reflected by the upper reflecting surface in the far-side light-emitting grating can be blocked by the separating strips, so that the influence of horizontal glare on the vision effect of the teacher due to the fact that the horizontal glare enters the eyes of the teacher is avoided.

When H/L is less than 0.6, the light-emitting angle of the light-emitting grille is large, and correspondingly, the shading angle of the grille is too small, at the moment, part of light rays reflected by the upper reflecting surface in the far-side light-emitting grille can enter the eyes of a teacher, so that the visual effect of the teacher when the teacher looks at the front side of the blackboard is influenced, and when H/L is more than 0.8, the spacing of the partition bars in the reflecting grille is too close and the distribution is too dense, the light-emitting angle of the light-emitting grille is too small, so that the light rays emitted by the L ED light bar can be shielded by more partition bars, and the overall brightness of the L ED.

Preferably, the axis of the separating strip is a convex arc line taking the arrangement axis of L ED lamp beads as the center of a circle, so that the separating strip has basically consistent reflection angle and reflection effect relative to L ED lamp beads, the illumination uniformity of the L ED lamp strip is improved, and the light outlet angle of the light outlet grating is accurately controlled.

Preferably, the upper reflecting surface is an inclined surface inclined inward from bottom to top.

Because the main effect of going up the plane of reflection lies in the lateral glare that reflection L ED lamp strip sent, consequently, from the last plane of reflection of supreme inside slope down, can make the downward reflection light of most lateral glare and horizontal plane form less contained angle, reflection light at this moment can't directly outwards shoot from light-emitting grid opening part, form decurrent reverberation behind the lower plane of reflection that reflection light projected opposite side parting bead, and shine on the blackboard, thereby be favorable to improving irradiant utilization ratio, under the prerequisite of the same L ED lamp strip power, promote the luminance of blackboard.

Preferably, the distance between adjacent division bars becomes gradually smaller from one end to the other end of the housing.

The utility model discloses make L ED lighting device from keeping away from teacher one side to being close to distance L between the adjacent parting bead of teacher one side diminishes gradually, correspondingly, the grid shading angle of light-emitting grid increases gradually, consequently, both can avoid L ED lighting device's the glare that the light-emitting grid jetted out to influence teacher's visual effect effectively, can reduce the blocking of parting bead to light again furthest to promote L ED light's utilization ratio as far as possible.

Preferably, the ratio of the height of the upper reflecting surface to the height of the lower reflecting surface is between 1/3.5 and 1/2.5.

When the height ratio of the upper reflecting surface to the lower reflecting surface is less than 1/3.5, more side glare emitted by the side-looking L ED lamp strip is emitted from the light-emitting grating, the grating shading angle is reduced, and the visual effect of a teacher on a blackboard is influenced.

Preferably, the inner side walls of the two sides of the opening of the shell are respectively provided with a U-shaped clamping groove, a diffusion plate is arranged in a light outgoing area between the L ED light bar and the reflection grating, and the two sides of the diffusion plate are respectively movably matched in the U-shaped clamping grooves of the two sides of the opening of the shell.

The diffusion plate can be a thin plate made of transparent plastic, fine frosted lines are formed on the surface of the diffusion plate, soft diffused light is formed after light rays emitted by L ED lamp beads penetrate through the diffusion plate and is uniformly emitted outwards and irradiated onto a blackboard, and stimulation to eyes can be effectively avoided when people look up on the head to look directly at the L ED lighting device.

Preferably, the inner side wall of the shell is provided with a longitudinal connecting bayonet, the cross section of the connecting bayonet is arc-shaped, the central angle corresponding to the connecting bayonet is 270-330 degrees, the sealing cover is provided with a screw counter bore corresponding to the connecting bayonet, and the screw punching hole is internally provided with a fastening screw in threaded connection with the connecting bayonet.

When the sealing cover and the shell need to be connected, only the fastening screw which is in threaded connection with the connecting bayonet is arranged in the screw counter bore of the sealing cover. The utility model discloses with the central angle control of the connection bayonet socket of transversal personally submitting convex between 270-330, both be convenient for the connection bayonet socket through extrusion moulding technology and casing integrated into one piece to make things convenient for the manufacturing of casing, can make the connection bayonet socket be fit for the screw of different specifications again. When the outer diameter of the screw is increased, the opening of the connecting bayonet is correspondingly expanded, so that the fastening screw can be easily screwed, and meanwhile, the connecting strength between the fastening screw and the connecting bayonet can be ensured by a proper central angle.

Particularly, the utility model discloses a connecting bayonet socket is transversal personally submits C shape, consequently, we need not to process the internal thread in connecting bayonet socket's hole, only need with the external diameter be greater than the self-tapping screw of connecting bayonet socket internal diameter can attack in connecting bayonet socket's hole to strut connecting bayonet socket, both convenient assembly can ensure the joint strength of closing cap again.

Preferably, a longitudinally extending sliding opening is arranged in the middle of the rear side of the shell, side walls on two sides of the sliding opening on the inner side wall of the shell are integrally connected with side walls vertical to the inner side wall of the shell, edges of the two side walls are connected into a whole through a bottom wall, so that a T-shaped groove is defined, and a connecting piece is movably arranged in the T-shaped groove.

The utility model discloses set up the T-slot that link up the casing both ends at the casing rear side, both made things convenient for the removal of connecting piece, thereby convenient adjustment the utility model discloses in classroom mounted position's adjustment, can avoid the connecting piece to drop from the T-slot again, make the casing form in week simultaneously and seal, be favorable to improving the intensity of casing.

Preferably, the connecting piece comprises a screw body and a sliding head connected to one end of the screw body, the sliding head is movably matched in the T-shaped groove, and one end, extending out of the T-shaped groove, of the screw body is in threaded connection with a fastening nut attached to the rear side wall of the shell.

Because the sliding head of the connecting piece is matched in the T-shaped groove, the connecting piece can move along the T-shaped groove conveniently, and the position of the shell can be adjusted conveniently. When the two ends of the shell are sealed by the sealing covers, the connecting piece can be prevented from falling out of the T-shaped groove of the shell. When the position of the shell is well positioned, the connecting piece and the shell can be relatively fixed only by screwing the fastening nut, and then the mounting position of the shell is fixed.

Therefore, the utility model discloses following beneficial effect has: the dazzling value to teachers can be obviously reduced while the illuminance of the blackboard is ensured, and the visual comfort of the teachers is improved.

Drawings

Fig. 1 is a schematic view of an exploded structure of the present invention.

Fig. 2 is a schematic end view of the housing.

Fig. 3 is a partial structural view of a reflection grating.

Fig. 4 is a schematic view of the structure of the separator.

Fig. 5 is a schematic diagram of light reflection of L ED light bars at the light exit grid.

Fig. 6 is a partial structure diagram at the T-shaped groove of the housing.

In the figure, the light guide plate comprises a shell 1, a shell 11, a shell 111, a light emergent area 112, a T-shaped groove 113, a sliding opening 114, a side wall 115, a bottom wall 12, a sealing cover 13, a mounting plate 131, a guide rail 14, a U-shaped clamping groove 15, a connecting bayonet 2, an L ED lamp strip 21, a base plate 22, a L ED lamp bead 23, a polarized lens 3, a diffusion plate 4, a connecting piece 41, a screw rod body 42, a sliding head 43, a fastening nut 5, a reflection grating 51, a fixing edge strip 52, a separating strip 521, an upper reflection surface 522, a lower reflection surface 53 and a light emergent grating.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

As shown in FIGS. 1 and 2, a blackboard L ED lighting device for reducing glare includes a housing 1, a L ED light strip 2 disposed in the housing, the housing includes an elongated housing 11 formed by extrusion molding of aluminum alloy, covers 12 detachably disposed at both ends of the housing, and an opening extending in a longitudinal direction is formed at a front side of the housing, that is, the housing has a uniform cross section, a mounting plate 13 extending in the longitudinal direction is disposed in the housing, both sides of the mounting plate are integrally connected to inner side walls of the housing, so as to be integrally formed with the housing through the extrusion molding process, the front side surface of the mounting plate is integrally provided with two opposing guide rails 131 extending in the longitudinal direction, a L ED light strip includes an elongated base plate 21 interposed between the two guide rails and abutting against the mounting plate, a plurality of L ED beads 22 disposed at longitudinally spaced intervals on the base plate, so that the opening of the housing forms a light exit region 111, a reflective rectangular grid 5 is disposed at the light exit region, as shown in FIG. 3, the reflective grid includes two fixed LED strips 51 extending in the longitudinal direction, a plurality of LED separating strips 52 connected between the fixed strips, so that light strips 52 are efficiently emitted to control light emitted onto the blackboard, and light strips 539.

As shown in FIGS. 4 and 5, the two side surfaces of the spacer bar respectively comprise an upper reflecting surface 521 at the upper part and a lower reflecting surface 522 at the lower part, wherein the upper reflecting surface is a plane, the cross section of the lower reflecting surface is a part of a parabola with a downward opening, that is, the lower reflecting surface is a part of a paraboloid with a downward opening.

It can be understood that, by virtue of the parabolic "light-gathering effect" of the lower reflecting surface, most of the light emitted by the L ED light bar is reflected by the lower reflecting surface and then emitted downward to irradiate the blackboard, which not only can improve the illuminance of the blackboard, but also can avoid the horizontal glare from adversely affecting the vision of teachers, while a small part of the lateral light emitted by the L ED light bar is emitted from the openings of the reflecting gratings after being reflected by the upper reflecting surface, thereby controlling the light-emitting angle of each light-emitting grating.

It should be noted that the present invention can be fixedly installed on the ceiling of the classroom or hung on the ceiling of the classroom, and preferably 2-3 of the L ED lighting devices of the present invention can be coaxially installed to satisfy the lighting requirements of the blackboard.

In addition, L ED lamp strip still can preferably include the polarized lens 23 who covers base plate and L ED lamp pearl, and polarized lens can make with optics level PMMA, and it can make the light that L ED lamp pearl sent gather together, change the direction, and shine the light evenly in the direction of height of clipboard.

Certainly, a driving power supply for driving L ED lamp beads needs to be arranged on the rear side surface of the mounting plate, and since the polarized lens, the driving power supply and the like of the L ED lamp belong to the prior art, too much description is not provided herein.

It is known that light from the top of the teacher's head does not affect the teacher's vision when the teacher stands in front of the blackboard in a neutral position facing the blackboard, and lateral light from the light-exiting grille from a remote L ED illuminator off the teacher's head may enter the teacher's eyes, or alternatively, the teacher's lateral line of sight may see glare from a remote L ED illuminator, thereby affecting the teacher's vision.

The utility model discloses the ratio control between the distance L between the height H of parting bead and two adjacent parting beads is 0.6 be less than or equal to H/L be less than or equal to 0.8 to controllable light-emitting grating's light-emitting angle and grid shading angle we know, L ED lamp strip is roughly located the intermediate position above the light-emitting grating, therefore, the light that sends from the light-emitting grating is the fan-shaped that expands outward, and the so-called light-emitting angle extremely leads to the central angle of light, and grid shading angle then refers to contained angle α between the most marginal light and the horizontal plane in this fan-shaped light.

When a teacher stands in the middle of the platform and faces the blackboard and looks sideways at the far-side light-emitting grating, light rays reflected by the upper reflecting surface in the far-side light-emitting grating can be blocked by the lower edge of the separating strip, so that horizontal glare is prevented from entering eyes of the teacher to influence the visual effect of the teacher, namely, the residual light of the eyes of the teacher cannot see light rays emitted by the L ED light bars and the L ED light bars in the far-side light-emitting grating, the glare value of the teacher can be remarkably reduced, and the visual comfort of the teacher is improved.

As a preferred scheme, the separating strip is bent into an arc shape, namely, the central axis of the separating strip is an outward convex arc line taking the arrangement axis of L ED lamp beads as the center of a circle, so that the distances of the separating strip relative to L ED lamp beads at all places are the same, in a radial section taking the arrangement axis of L ED lamp beads as the center of a circle, the upper reflecting surface and the lower reflecting surface at two sides of the separating strip are the same in shape, the relative L ED lamp beads at all places of the separating strip have basically consistent reflecting angles and reflecting effects, the uniformity of L ED lamp strip illumination is improved, and the light emitting angle of the light grid is accurately controlled.

The upper reflecting surface mainly acts on reflecting the lateral glare emitted by the L ED lamp strip, so that the downward reflected light of most of the lateral glare and the horizontal plane form a smaller included angle, the reflected light cannot be directly emitted from the opening of the light-emitting grille, the reflected light is projected to the lower reflecting surface of the other side separating strip and then reflected again, so that downward reflected light is formed and irradiates the blackboard, the utilization rate of illumination is improved, and the brightness of the blackboard is improved on the premise of the same power of the L ED lamp strip.

When the LED lighting device is installed and used, one side with larger distance between the separation bars is positioned at the outer side far away from a teacher, and the other side with smaller distance between the separation bars is positioned at the inner side close to the teacher, so that the influence of glare emitted by the light-emitting grids of the L ED lighting device on the visual effect of the teacher can be effectively avoided, the blocking of the separation bars on light can be reduced to the greatest extent, and the utilization rate of L ED light can be improved as much as possible.

Furthermore, in the radial section of the separating strips, the ratio of the height of the upper reflecting surface to the height of the lower reflecting surface can be controlled to be between 1/3.5 and 1/2.5, so that most of light rays emitted by the L ED lamp strip are reflected by the separating strips and then irradiated onto the blackboard, and the light outlet grating can have a proper grating shading angle, so that the visual effect of teachers is prevented from being influenced by glare.

As another preferred scheme, the inner side walls of two sides of the opening of the shell are respectively provided with a U-shaped clamping groove 14, the light emitting area between the L ED lamp strip and the reflection grating is internally provided with a diffusion plate 3 which is made of acrylic and has a frosted surface, and two sides of the width direction of the diffusion plate are respectively movably matched in the U-shaped clamping grooves of the two sides of the opening of the shell, so that the diffusion plate is convenient to assemble.

In order to facilitate the assembly of the sealing cover, two longitudinal connecting bayonets 15 can be respectively arranged on the inner side walls of two sides of the opening of the shell, the cross sections of the connecting bayonets are arc-shaped, the central angles corresponding to the connecting bayonets are 270-330 degrees, so that the cross sections of the connecting bayonets are C-shaped, screw counter bores are arranged at the positions, corresponding to the connecting bayonets, of the sealing cover, and fastening screws are arranged in the screw counter bores. When the sealing cover needs to be fixed on the shell, the fastening screw can conveniently pass through the screw counter bore and be connected on the connecting bayonet in a threaded mode.

It should be noted that, the fastening screw may be a self-tapping screw, and when the fastening screw enters the connection bayonet, the opening of the connection bayonet is correspondingly opened, so as to ensure that the fastening screw can be easily screwed, and simultaneously ensure the connection strength between the fastening screw and the connection bayonet, and there is no need to process an internal thread in the inner hole of the connection bayonet.

Preferably, as shown in fig. 2 and 6, a sliding opening 113 extending longitudinally is provided in the middle of the rear side wall of the housing, side walls 114 vertical to the inner side wall of the housing are respectively integrally connected to both sides of the sliding opening of the inner side wall of the housing, and the edges of the two side walls are integrally connected through a bottom wall 115 so as to enclose the T-shaped slot 112, and the housing is still kept in a continuous closed state in the circumferential direction. In addition, at the movably connecting piece 4 that sets up of T shape inslot to it will be so that through the connecting piece the utility model discloses fix on the base of classroom ceiling, perhaps hang on the ceiling in classroom to through the position of adjusting the connecting piece in T shape groove, conveniently adjust the utility model discloses mounted position in the classroom.

Further, the connecting piece includes screw rod body 41 with the external screw thread, connects the slip head 42 at screw rod body one end rectangle, and the movably adaptation of slip head is in the T-slot to can avoid the rotation of connecting piece, the one end threaded connection that the screw rod body stretches out the T-slot has the fastening nut 43 who leans on the casing back wall. When we have positioned the position of the shell, the connecting piece and the shell can be relatively fixed only by screwing the fastening nut, and then the relative blackboard of the utility model is fixed on the left and right direction.

Claims (9)

1. A blackboard L ED lighting device capable of reducing glare value comprises a shell and an L ED lamp strip arranged in the shell, wherein the L ED lamp strip comprises a strip-shaped substrate and a plurality of L ED lamp beads arranged on the substrate, and is characterized in that the shell comprises a strip-shaped shell formed by aluminum alloy extrusion molding and covers detachably arranged at two ends of the shell, an opening extending along the longitudinal direction is arranged on the front side of the shell, a light emitting area is formed by the opening, a reflection grating is arranged in the light emitting area and comprises two fixing edge strips extending along the longitudinal direction of two sides of the opening and a separation strip connected between the two fixing edge strips, so that a plurality of light emitting gratings are separated between the two fixing edge strips, two side surfaces of the separation strip respectively comprise an upper reflection surface at the upper part and a lower reflection surface at the lower part, the upper reflection surface is a plane, the cross section of the lower reflection surface is a part of a parabola with the downward opening, the distance between two adjacent separation strips is L, the height of the separation strip is H, and H/L is.

2. The blackboard L ED lighting device of claim 1, wherein the axis of the separating strip is a convex arc centered on the axis of L ED beads.

3. The blackboard L ED lighting device for reducing glare as claimed in claim 1, wherein the upper reflecting surface is a slant surface inclined inward from bottom to top.

4. The blackboard L ED lighting device for reducing glare as claimed in claim 1, wherein the distance between adjacent separating strips is gradually reduced from one end of the housing to the other.

5. The blackboard L ED lighting device for reducing glare as claimed in claim 1, wherein the ratio of the height of the upper reflecting surface to the height of the lower reflecting surface is between 1/3.5-1/2.5.

6. The blackboard L ED lighting device of claim 1, wherein the inside walls of the two sides of the opening of the housing are respectively provided with U-shaped slots, the light exit area between the L ED light bar and the reflective grille is provided with a diffusion plate, and the two sides of the diffusion plate are respectively movably fitted in the U-shaped slots of the two sides of the opening of the housing.

7. The blackboard L ED lighting device of claim 1, wherein a longitudinal connecting bayonet is formed on the inner side wall of the housing, the connecting bayonet has a circular arc cross section, the central angle of the connecting bayonet is 270 ° -330 °, the cover has a screw counter bore at the corresponding connecting bayonet, and the screw counter bore has a fastening screw in threaded connection with the connecting bayonet.

8. A blackboard L ED lighting device capable of reducing the glare as claimed in claim 1, wherein a sliding opening extending longitudinally is formed in the middle of the rear side of the housing, the side walls on both sides of the sliding opening are integrally connected to the side walls perpendicular to the inner side wall of the housing, the edges of the two side walls are integrally connected through the bottom wall to form a T-shaped slot, and the T-shaped slot is movably provided with a connecting member.

9. The blackboard L ED lighting device for reducing glare as claimed in claim 8, wherein the connector includes a screw body, a sliding head connected to one end of the screw body, the sliding head is movably fitted in the T-shaped slot, and the end of the screw body extending out of the T-shaped slot is threadedly connected to a fastening nut abutting against the rear wall of the housing.

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