CN204740364U - Optical element and lighting device - Google Patents

Abstract

The utility model provides an optical element, which includes a substrate, the substrate has opposite upper and lower surfaces and a pair of side walls, the upper surface of the substrate is a light-emitting surface, and the upper surface is provided with a plurality of raised The first microstructure unit, the bottom end of the first microstructure unit is arranged on the upper surface, and the top end opposite to the bottom end has a groove structure, and the lower surface of the substrate is the light incident surface of the optical element ,? A plurality of second microstructure units are arranged on the lower surface, and the plurality of second microstructure units are recessed from the lower surface into the substrate. The utility model also provides a lighting device. This kind of optical element with double-sided microstructure, through the cooperation of the microstructure units on the upper and lower surfaces of the optical element, jointly changes the propagation direction of light to realize batwing light distribution, so that the illumination of the working surface is more uniform.

Description

Optical element and lighting device

technical field

The utility model relates to an optical element, in particular to an optical element with a microstructure and a lighting device.

Background technique

When the brightness of a light source or object in the field of view is much greater than the brightness to which the human eye has adapted, people will feel dazzling, and this phenomenon is called glare. The national standard GB50034-2004 has clear regulations on glare and uniformity: the uniformity of illumination in the working room or work area should not be less than 0.7; libraries, reading rooms, offices, medical clinics and other places require a uniform glare value UGR< 19.

There are many ways to control glare on the market, such as anti-glare rings commonly used in downlights and ceiling lights, grilles in grille lamp panels, etc., but it is difficult to control the light distribution shape and glare index of large-angle panel lamps At present, some low-glare panel lights on the market use the method of adding a prism plate to control glare. Due to the requirements of the overall weight of the prism plate, the influence of thickness on the optical efficiency, the limitation of production cost and the consideration of the appearance, the prism The total thickness of the plate is generally 2-3mm, and the height of the microstructure is often even smaller. Figure 1 and Figure 2 show several common prism plates on the market. Prism plates with arc-shaped microstructures basically do not change the shape of the light distribution curve; prism plates with jagged microstructures only change the Lambertian light distribution within a certain range. It is difficult to realize the batwing light distribution curve to achieve low glare and uniform illumination of the working surface.

Contents of the invention

The technical problem to be solved by the utility model is to provide a uniform illuminance and low glare optical element with microstructure units and a lighting device using the optical element.

In order to achieve the above object, the utility model adopts the following technical solutions.

An optical element, comprising a substrate, the substrate has opposite upper and lower surfaces and a pair of side walls, the upper surface of the substrate is a light-emitting surface, and the upper surface is provided with a plurality of protruding first microstructure units , the bottom end of the first microstructure unit is arranged on the upper surface, and the top end opposite to the bottom end has a groove structure, the lower surface of the substrate is the light incident surface of the optical element, the lower surface A plurality of second microstructure units are arranged on the upper surface, and the plurality of second microstructure units are recessed from the lower surface into the substrate.

Preferably, each second microstructure unit corresponds to one first microstructure unit in the height direction of the substrate.

Preferably, the first microstructure unit and the second microstructure unit have the same width along the transverse axis of the substrate.

Preferably, the first microstructure unit includes a concave middle region and a raised edge region located in the middle region, and the middle region and the edge region transition smoothly.

Preferably, in the cross-section of the first microstructure unit, the middle area is formed as a concave parabola or V-shape or an arc, and the edge area is formed as a convex parabola or an arc.

Preferably, in the cross section of the first microstructure unit, the radius of the arc formed by the edge region is greater than or equal to 0.3 mm.

Preferably, the height from the upper surface of the substrate to the apex of the edge region is less than half of the thickness of the substrate.

Preferably, in the cross-section of the second microstructure unit, the concave part is in the shape of a concave parabola or an arc or an inverted V shape. The above substrate is made of acrylic or PC material.

Preferably, when the angle between the incident light and the vertical direction is between 0 degrees and 30 degrees, after the incident light passes through the first microstructure unit and the second microstructure unit of the optical element, the outgoing light and the vertical direction The included angle is around 20° to 30°.

Preferably, when the angle between the incident light and the vertical direction is between 60 degrees and 90 degrees, after the incident light passes through the first microstructure unit and the second microstructure unit of the optical element, the outgoing light and the vertical direction The angle in the vertical direction is around 40 degrees to 60 degrees.

The utility model also provides an illuminating device, which is characterized in that it comprises a light source and the above-mentioned optical element, and the light emitted by the light source is emitted uniformly through the optical element. The lighting device also includes a diffuser plate, the optical element being adjacent to the diffuser plate.

Preferably, the lower surface of the optical element is attached to the diffusion plate.

Preferably, the diffusion plate includes at least two mutually angled light exit surfaces, and the optical element is provided with at least two mutually angled regions corresponding to the light exit surfaces of the diffusion plate.

Beneficial effects: the utility model designs an optical element with a double-sided microstructure. The microstructure units on the upper and lower surfaces of the optical element cooperate with each other to jointly change the propagation direction of light to realize batwing light distribution, which can more effectively reduce UGR. value, achieving low glare and more uniform illuminance on the working surface.

In the lighting device, the optical element is combined with the diffusion plate, placed above the light source, and the reflection and refraction of the light by the microstructure unit is used to change the direction of light propagation, so as to realize the batwing light distribution, and achieve a wide lighting range and high illumination of the working surface. Uniform, low glare UGR value, can achieve the lighting effect of large-angle light above 110°.

According to the following description of the utility model with reference to the accompanying drawings, other objects and effects of the utility model will become apparent, and readers can fully understand the utility model.

Description of drawings

Fig. 1 is the microstructure schematic diagram of prior art prism plate one

Fig. 2 is the microstructure schematic diagram of prior art prism plate two;

Fig. 3 is the schematic diagram of an embodiment of the optical element of the present invention;

4 is a schematic diagram of a cross-sectional view of an optical element consistent with an embodiment of the present invention;

Fig. 5 is a schematic diagram of the direction of propagation of incident light at medium and small angles in the optical element of the present invention;

Fig. 6 is a schematic diagram of the propagation direction of the large-angle incident light in the optical element of the present invention;

Fig. 7 is the light distribution curve of the optical element of the present invention;

Fig. 8 is a structural diagram of an embodiment of the lighting device of the present invention;

Fig. 9 is a structural diagram of another embodiment of the lighting device of the present invention.

Detailed ways

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the drawings.

The optical element of the present invention will be described below with reference to FIG. 3 to FIG. 7 .

An optical element 10 includes a substrate 16 having opposite upper and lower surfaces 14 , 15 and a pair of sidewalls 17 , 18 . The upper surface 14 of the substrate is the light-emitting surface of the optical element, and a plurality of first microstructure units 12 are arranged at intervals on the upper surface. The first microstructure units 12 protrude from the upper surface 14, and the bottom 122 of the first microstructure unit is arranged on On the upper surface, the top end 121 of the protrusion of the first microstructure unit opposite to the bottom end has a groove structure. A plurality of second microstructure units 13 are arranged at intervals on the lower surface 15 of the above-mentioned substrate 16 , the second microstructure units 13 are the light-emitting surface of the optical element, and the second microstructure units are recessed from the lower surface 15 into the substrate 16 . Therefore, the first and second microstructure units 12 and 13 arranged on the substrate 16 correspond to each other in the height direction, that is, the Z-axis direction in FIG. 3 , that is, each second microstructure unit 13 corresponds to the height direction of the substrate. A first microstructure unit 12 . And extend longitudinally along the length direction of the substrate 16 , that is, the Y-axis direction. In addition, each of the first and second microstructure units 12 , 13 extends along the transverse axis of the substrate 16 , ie, the distance extending in the X direction is equal to each other. The first microstructure unit 12 and the substrate 16 can be integrally formed.

Fig. 4 is a schematic diagram of a cross-sectional view of the optical element of the present invention, and the cross-section is a cross-section perpendicular to the Y axis in the XYZ coordinate system in Fig. 3 . Referring to FIG. 4 , the first microstructure unit 12 includes a concave middle region 1211 and adjacent raised edge regions 1212 and 1213 located on both sides of the middle region, and the transition between the middle region and the edge regions is smooth. In the embodiment of FIG. 4 , the shape of the middle area 1211 is a V-shaped curve. In addition, the shape of the middle area can also be a concave parabola or a circular arc. In Fig. 4, the cross-sections 1212, 1213 of the edge regions are circular arcs, and may also be convex parabolas. If the curve formed after the section of the edge area is arc-shaped, the radius of the arc is greater than or equal to 0.3 mm. In order to meet mold forming accuracy during processing, the distance between two vertices in the transition region adjacent to two adjacent first microstructure units, that is, the distance between two adjacent first microstructure units is preferably greater than 2 mm.

In FIG. 4 , the first microstructure unit 12 is a left-right symmetrical structure, which is symmetrical to the center line passing through the groove structure. In order to facilitate processing and production and accurately control the surface error, the height H1 of the first microstructure unit 12 is controlled within 1/3 of the overall wall thickness H of the optical element 1, that is, from the upper surface 14 of the substrate 16 to the edge region 1212 , 1213 vertex, that is, the height of the arc vertex R or the parabolic vertex R is less than 1/2 of the thickness of the substrate 16, thereby avoiding the high height of the optical element 1 and causing the material to be deformed, which affects the accuracy of the optical element .

In addition, the width of the first microstructure unit along the X-axis of the substrate transverse axis, that is, the distance W1 between the two vertices of the first microstructure unit, is equal to the width of the second microstructure unit along the X-axis of the substrate transverse axis, that is, the same as The distance W2 between the two connected nodes of the second microstructure unit and the lower surface of the substrate is equal.

In addition, the overall wall thickness H of the optical element 1 is controlled within 3 mm, so as to reduce the overall weight of the optical element 1 and facilitate the installation and fixing of the optical element 1 . In order to obtain a better optical effect, the optical element 1 is preferably made of transparent PMMA material, and secondly, transparent PC material can also be selected.

5 and 6 are schematic diagrams of the direction of propagation of the incident light in the optical element 1 of the present invention, wherein the angle of the incident light refers to the angle between the incident light and the vertical direction, that is, the Z-axis direction, such as 0°-10° Directional light means that the angle between the incident light and the vertical direction is 0°-10°, that is, the angle between the incident light and the vertical axis Z in the plane coordinate XZ shown in Figure 5 .

The first microstructure unit 12 of the optical element 1 can control the light in the direction of 0°-10° and 55°-70°, deflect it to around 20°-30°, reduce the central light intensity, and increase the light intensity by 20° The light intensity in the direction of -30°; the first microstructure unit 12 can also control the light in the direction of angle 10°-55° and angle 70°-90°, and deflect it to the direction of 40°-60°, thereby reducing Ratio of light at angles near 10° and outside 60°.

Compared with the standard batwing light distribution, the light distribution curve of the light passing through the first microstructure unit 12 on the upper surface 14 of the optical element 1 has a smaller light intensity at an angle of 20°-30°, and at an angle of 40°- The light intensity in the 60° direction is stronger, and the shape of such a light distribution curve has been greatly improved in terms of uniformity and glare UGR than the ordinary light distribution curve. In order to obtain a better effect, the optical element 1 is provided with multiple second Two microstructure units 13.

Referring to FIG. 5 , the angle between the incident light in part A and the vertical direction is between 10°-30°, that is, the incident light at a medium angle is deflected to a small size after passing through the second microstructure unit 13 on the lower surface 15 of the optical element 1. Near the angle of 0°-7°, it is refracted by the first microstructure unit 12 on the upper surface 14 and emitted, and the angle between the direction of the final outgoing light and the vertical direction is about 20°-30°.

In Fig. 5, the angle between the incident light of part B and the vertical direction is between 0°-10°, which is called small-angle incident light, and after passing through the second microstructure unit 13 on the lower surface of the optical element, a slight deflection occurs , the refracted light forms an angle of about 7°-12° with the vertical direction, and is refracted by the first microstructure unit 12 on the upper surface 14 of the optical element 1 before exiting, and the angle between the direction of the final outgoing light and the vertical direction is about Around 20°-30°, the deviation does not exceed plus or minus 5 degrees. For example, 10 degrees will be deflected to 30°, and 12 degrees will be deflected to 33 degrees.

In Fig. 6, the incident rays of the two parts C and D respectively have angles between 60°-90° with the vertical direction, and after passing through the second microstructure unit 13 of the lower surface 15, they are deflected to around 15°-50°, After being refracted and totally reflected by the first microstructure unit 12 on the upper surface 14, it is emitted, and the angle between the direction of the final outgoing light and the vertical direction is about 40°-60°.

Fig. 7 is the light distribution curve of the optical element of the present invention. Because the second microstructure unit 13 can concentrate the light in the direction of an angle of 10°-30° to a small angle of 0°-10°, and enter the surface of the first microstructure unit 12 through the interior of the substrate, according to the first microstructure unit 12 Function, the angle of this part of the light will be deflected to the direction of 20°-30°, so that part of the energy of the light in the direction of 40°-60° will be deflected to the direction of 20°-30°. UGR has a better effect.

FIG. 8 is an embodiment of the lighting device using the optical element 1 of the present invention. Referring to FIG. 8 , the lighting device includes a light source board 40 on which LEDs are arranged, the light source board 40 is placed in a chassis 50 , and the lower surface of the light source board 40 is bonded to the chassis 50 . The lighting device also includes a diffusion plate 30 and the above-mentioned optical element 10 , the optical element 10 is arranged above the diffusion plate 30 , and the incident light enters the optical element from the diffusion plate 30 . Undefined, emitted from the optical element 10. In this embodiment, the lower surface of the optical element 10 is attached to the diffusion plate 30 . The optical element 10 and the diffusion plate 30 are assembled and fixed on the frame 20 , and the frame 20 and the side wall of the chassis 50 are fixed together by screws or other means.

In the absence of the above-mentioned optical element 10, when the luminous flux is 3000lm, UGR=22, after adding the optical element 10 with double-sided microstructure units 12, 13, the batwing light distribution and the control of the light output angle can be controlled at Between 110°-120°, UGR<19 (luminous flux 3000lm). Therefore, a lighting device with wide lighting range, uniform illumination of the working surface, low glare and large angle is provided.

FIG. 9 is another embodiment of the lighting device using the optical element 10 of the present invention.

Compared with the embodiment shown in FIG. 8, the lighting device in FIG. 9 changes the shape of the diffusion plate 30 and the above-mentioned optical element 10. The diffusion plate 30 is set to be composed of at least two light-emitting surfaces that are at an angle to each other, and the optical element 10 is provided with at least two regions corresponding to the light-emitting surface of the diffusion plate 30 and forming an angle with each other. In this embodiment, the light-emitting surface of the diffusion plate 30 is divided into three areas, which form a certain angle (about 10°) with each other. In addition, the diffusion plate 30 can also include two light-emitting surfaces that are mutually angled, or three The above light emitting surfaces are at an angle to each other. The optical element 10 is also provided with at least two mutually angled regions corresponding to the light emitting surface of the diffusion plate 30 . The LEDs are arranged on the light source board 40 , the light source board 40 is placed in the chassis 50 , and the lower surface of the light source board 40 is attached to the chassis 50 . The optical element 10 and the diffuser plate 30 are placed in the chassis 50 and placed above the light source board 40 , the optical element is fixed on the frame 20 , and the frame 20 and the side wall of the chassis 50 are fixed together by screws or other means.

The lighting device after adopting the above-mentioned optical element 10 can realize the light output angle between 110°-120°, UGR<19 (luminous flux 3000lm) and batwing light distribution, so as to provide a wide lighting range, uniform illumination of the working surface, low The glare UGR value can reach a lighting device with a large angle of light above 110°.

The above are only preferred embodiments of the present utility model, and do not limit the utility model in any form. Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any Those who are familiar with this profession, without departing from the scope of the technical solution of the present utility model, can use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but all without departing from the technical solution of the utility model Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the utility model still belong to the scope of the technical solution of the utility model.

Claims (16)

1. an optical element (10), comprise substrate (16), described substrate has relative upper, lower surface (14, 15) and pair of sidewalls (17, 18), it is characterized in that, the upper surface (14) of described substrate (16) is exiting surface, described upper surface is provided with first microstructure unit (12) of multiple projection, the bottom (122) of described first microstructure unit is arranged on the upper surface, the top (121) relative with bottom (122) has groove structure, the incidence surface that the lower surface (15) of described substrate (16) is described optical element, described lower surface is provided with multiple second microstructure unit (13), described multiple second microstructure unit (13) from lower surface to described substrate (16) sunken inside.

2. optical element according to claim 1, is characterized in that, the second microstructure unit (13) described in each is corresponding described first microstructure unit (12) on described substrate height direction.

3. optical element according to claim 2, is characterized in that, described first microstructure unit is identical along the width of substrate transverse axis with described second microstructure unit.

4. optical element according to claim 2, it is characterized in that, described first microstructure unit (12) comprises the zone line (1211) of depression and is positioned at the fringe region (1212,1213) of projection of described zone line, and zone line and fringe region seamlessly transit.

5. optical element according to claim 4, it is characterized in that, in the cross section of described first microstructure unit (12), described zone line (121) is formed as recessed para-curve or V-type or circular arc, and described fringe region (122,123) forms convex para-curve or circular arc.

6. optical element according to claim 5, is characterized in that, in the cross section of described first microstructure unit (12), the arc radius that fringe region is formed is more than or equal to 0.3mm.

7. optical element according to claim 5, is characterized in that, described substrate (16) upper surface is less than 1/2nd of described substrate thickness to the height on the summit of described fringe region.

8. optical element according to claim 1, is characterized in that, in the cross section of described second microstructure unit, described depressed part is fractal is recessed para-curve or circular arc or reverse V-shaped.

9. optical element according to claim 1, is characterized in that, described substrate is made up of acrylic or PC material.

10. optical element according to claim 1, is characterized in that, described substrate and described first microstructure unit integrated molding.

11. optical elements according to claim 1, it is characterized in that, when the angle of incident ray and vertical direction is between 0 degree to 30 degree, incident ray is by after described first microstructure unit and the second microstructure unit, and the angle of emergent ray and vertical direction is near 20 degree to 30 degree.

12. optical elements according to claim 1, it is characterized in that, when the angle of incident ray and vertical direction is between 60 degree to 90 degree, incident ray is by after described first microstructure unit and described second microstructure unit, and the angle of emergent ray and vertical direction is near 40 degree to 60 degree.

13. 1 kinds of lighting devices, is characterized in that, comprise light source, according to the arbitrary described optical element of claim 1 to 12, the light that described light source sends is through described optical element uniform.

14. lighting devices according to claim 13, is characterized in that, also comprise diffuser plate, and described optical element is adjacent with described diffuser plate.

15. lighting devices according to claim 14, is characterized in that, the lower surface laminating of described optical element is arranged on described diffuser plate.

16. lighting devices according to claim 15, is characterized in that, described diffuser plate comprises at least two exiting surfaces at an angle to each other, and described optical element is provided with at an angle to each other at least two regions corresponding with the exiting surface of described diffuser plate.