LED light mixing system

Abstract

The present invention discloses an LED light mixing system, comprising a plurality of LEDs arranged in a certain pattern or shape and a PCB board for mounting the LEDs, wherein a light mixing module is arranged in the light emitting direction of the LEDs, the shape of the cross section of the light mixing module matches the shape formed by the arrangement of the LEDs, and the light mixing module is provided with a gap for the light emitted by the LEDs to pass through, and the light emitted by the LEDs is at least partially reflected and mixed by the light mixing module before being emitted. The technical solution arranges a light mixing module in the light emitting direction of the LEDs, so that at least a portion of the light beam of the LED is mixed and mixed by the light mixing module before being emitted, so as to achieve the beneficial effects of uniform color mixing and light mixing. Compared with the traditional light mixing technology, the light mixing technology has the beneficial effects of uniform color mixing, simplicity, effectiveness and cost saving.

Description

Technical Field

[0001] The present invention relates to the field of light mixing technology, and more specifically, to an LED light mixing system. Background Art

[0002] In the prior art, in order to obtain a high-power lighting system, multiple LEDs are generally arranged together according to a certain quantity ratio, and their brightness is enough to replace traditional platinum bulbs. However, since it is through multiple LEDs that emit light together, it is easy to cause the local light spot to be too bright. In response to this situation, traditional technologies mostly use light guides or integrators to mix light. However, the light source mixed by the light guide or integrator will produce an angle due to the relationship between the angles of the light beams, forming a so-called dark band area. On the other hand, in order to obtain better color mixing and light mixing effects, it is necessary to make highly precise process improvements to the structure of the light guide or integrator, which requires a lot of time, energy and cost, which restricts the development of LEDs. Summary of the invention

[0003] The present invention aims to overcome at least one defect of the above-mentioned prior art and provide an LED light mixing system with uniform color mixing and light mixing, so as to solve the problem of uneven light mixing of LED light sources.

[0004] The technical solution adopted by the present invention is an LED light mixing system, comprising a plurality of LEDs arranged in a certain pattern or shape and a PCB board for mounting the LEDs, wherein a light mixing module is provided in the light emitting direction of the LEDs, the shape of the cross section of the light mixing module matches the shape formed by the LED arrangement, and the light mixing module is provided with a gap for the light emitted by the LED to pass through, and at least part of the light emitted by the LED is reflected and mixed by the side wall of the gap formed by the light mixing module before being emitted.

[0005] In the present technical solution, the light mixing module is arranged in the light emitting direction of the LED. When the light beam emitted by the LED passes through the light mixing module, a small part of the light beam directly passes through the gap of the light mixing module, while most of the light enters the light mixing module at a certain angle, is projected onto the side wall of the light mixing module, and is reflected back and forth multiple times between the side walls of the light mixing module before being emitted, thereby achieving uniform light mixing.

[0006] When traditional LEDs are directly projected without passing through a light mixing module, there will be a problem of high brightness in the middle of the light spot and low brightness around the light spot, which affects the lighting effect. Compared with using an integrator and a light guide to mix the light beams emitted by the LED, the light mixing module of this technical solution mixes light through diffuse reflection, and the light mixing effect is more uniform. And for a light source with multiple LEDs arranged, the light guide or integrator is set in a one-to-one correspondence with the LEDs, and then the light is mixed, and dark areas are easily generated between adjacent LEDs, while the light mixing module mixes the entire light source group to make the formed light spot more uniform.

[0007] The LED may be a single color or a multi-color LED. After the light emitted by the LED enters the light mixing module and is reflected back and forth for multiple times, a light spot with no obvious color blocks and uniform color mixing is projected.

[0008] The shape of the light mixing module is designed according to the shape formed by the arrangement of the LEDs. Thus, the light mixing module can cover the LEDs to prevent light leakage from the LEDs. For example, when the LEDs are arranged in a matrix, the light mixing module is also designed in a matrix; when the LEDs are arranged in a circular shape, the light mixing module is also designed in a circular shape; when the LEDs are arranged in a spiral shape, the light mixing module is arranged in a spiral shape.

[0009] Furthermore, the light mixing module is composed of a plurality of light mixing components of annular design and different sizes, the centers of the light mixing components are on the same axis, and are arranged from small to large and from inside to outside, with gaps between adjacent light mixing components. The light mixing components are concentrically arranged so that the gap between two light mixing components is annular, and the width of the same annular gap is uniform, thereby ensuring that the light emitted by the LEDs in the same annular gap has a consistent degree of mixing and uniform brightness of the light spot.

[0010] Among them, a small part of the light emitted by the LED is directly emitted through the gap, and most of the light enters the mixing component at a certain angle and is projected onto the side wall of the mixing component, and is reflected back and forth multiple times, so that the light is mixed and then emitted to form a uniform light spot.

[0011] Furthermore, a collimating lens is provided between the LED and the light mixing module, and the collimating lens is in close contact with the LED, so that the light emitted by the LED enters the collimating lens as much as possible, and the collimating lens achieves a collimating effect on the light emitted by the LED, so that the light beam emitted by the LED enters the light mixing module at a nearly vertical angle, thereby reducing the light loss caused by excessive reflection times of the light emitted by the LED, and improving the utilization rate of the light emitted by the LED.

[0012] Furthermore, it also includes a collimating lens, an atomizing component and a lens component sequentially arranged along the light emitting direction of the LED, and the light mixing module is arranged between the collimating lens and the atomizing component. The atomizing component softens the light emitted by the light mixing module to achieve a light atomization effect.

[0013] Furthermore, the gap width of the light mixing module is less than or equal to the width of a single LED.

[0014] Since the light beam emitted by the LED conforms to the Lambertian distribution, by controlling the width of the gap, the light emitted by the LED can be projected onto the side wall of the light mixing module, so that the light emitted by the LED is reflected on the side wall to achieve the purpose of light mixing. When the gap of the light mixing module is narrower, more light can be projected onto the side wall, so that the light emitted by the LED is mixed more fully. At the same time, by reducing the width of the gap, the reflection distance of the light emitted by the LED in the gap can be shortened, and the number of reflections of the light emitted by the LED in the gap can be increased.

[0015] Furthermore, the ratio between the gap width of the light mixing module and the height of the light mixing module is between 1 / 8 and 1 / 3, which ensures that the light emitted by the LED can be reflected in the gap of the light mixing module, thereby ensuring the number of reflections, so that the light emitted by the LED can be more fully mixed in the light mixing module.

[0016] Among them, when the light emitted by the LED is reflected and mixed in the gap of the mixing module, the number of reflections is 2 to 5 times, which is enough to achieve the effect of light mixing, color mixing, and uniform light spot. After calculation, when the ratio of the gap width of the mixing module to the height of the mixing module is 1 / 3, the number of times the light is reflected in the gap of the mixing module can reach 2 to 3 times; when the ratio of the gap width of the mixing module to the height of the mixing module is 1 / 8, the number of times the light is reflected in the gap of the mixing module can reach more than 5 times. And the greater the difference between the gap width of the mixing module and the height of the mixing module, the greater the process difficulty, resulting in higher costs.

[0017] Furthermore, the side wall of the light mixing module forms a light reflection surface, and the side wall of the light mixing module is roughened, so that the light beam is diffusely reflected on the side wall of the light mixing module. After the roughening treatment, the side wall of the light mixing module forms a small and uniform concave and convex surface, so that the light beam is diffusely reflected between the side walls of the light mixing module, and the different light beams are fully mixed, and finally emitted from the exit surface of the light mixing module, so as to achieve a good light mixing effect. It improves the problem that the angle of reflection of the light beam passing through the smooth mirror or glass surface is too uniform, resulting in insufficient divergence of the reflection angle.

[0018] Furthermore, the LEDs are radially distributed from the center to the outside, and the light mixing component is cylindrical. The shape of the light mixing module matches the arrangement of the LEDs, thereby improving the utilization rate of the light emitted by the LEDs.

[0019] Furthermore, a fixing strip is provided on the bottom or top surface surrounded by the plurality of cylinders, and the fixing strip is located between the installation spacings of two adjacent LEDs, and the cylinders are connected and fixed by the fixing strip. The fixing strip is connected and fixed so that each of the light mixing components is integrated and fixed into the light mixing module. Since the fixing strip is small in size and located between the installation positions of two adjacent LEDs, the light path emitted by the LED is not blocked.

[0020] Furthermore, a comb-shaped fixing part is provided on the bottom surface or the top surface surrounded by the plurality of cylinders, and the comb-shaped fixing part is located between the installation spacings of two adjacent LEDs. The cylinders are connected and fixed by the comb-shaped fixing part, and the comb teeth of the comb-shaped fixing part extend into the cylinders. The comb-shaped fixing part fixes the light mixing component into the light mixing module, which is convenient for installation, and the light mixing module can be more stable by fixing the light mixing component with a comb-shaped structure. The comb-shaped fixing part is located between the installation spacings of two adjacent LEDs, so that the light path emitted by the LED is not blocked.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This technical solution sets a light mixing module in the light emitting direction of the LED, so that at least part of the light emitted by the LED is mixed and colored by the light mixing module before being emitted, so as to achieve the beneficial effect of uniform color mixing and light mixing. Compared with the traditional light mixing technology, it has the beneficial effects of uniform color mixing, simplicity, effectiveness and cost saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural diagram after disassembly of the present invention.

[0024] Figure 2 It is the front view after disassembly of the present invention.

[0025] Figure 3 It is the front view after the assembly of the present invention.

[0026] Figure 4 It is a schematic diagram of a state in which a light beam is reflected when passing through the gap of the light mixing module.

[0027] Figure 5 This is the LED arrangement status diagram.

[0028] Figure 6 Schematic diagram of the structure of the light mixing module.

[0029] Figure 7 This is a top view of the fixing strip installed on the light mixing module. DETAILED DESCRIPTION

[0030] The drawings of the present invention are only for illustrative purposes and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0031] Example 1

[0032] like Figure 1 and Figure 2 As shown, an LED light mixing system includes a plurality of LEDs 100 arranged in a certain pattern or shape and a PCB board 110 for mounting the LEDs 100, a light mixing module 500 is provided in the light emitting direction of the LEDs 100, the shape of the cross section of the light mixing module 500 matches the shape formed by the arrangement of the LEDs 100, and a gap is provided on the light mixing module 500 for the light emitted by the LEDs 100 to pass through, and at least part of the light emitted by the LEDs 100 is reflected and mixed by the side wall of the gap formed by the light mixing module 500 before being emitted.

[0033] In the present technical solution, the light mixing module 500 is arranged in the light emitting direction of the LED 100. When the light beam emitted by the LED 100 passes through the light mixing module 500, a small part of the light beam directly passes through the gap of the light mixing module 500, while a large part of the light enters the light mixing module 500 at a certain angle, is projected onto the side wall of the light mixing module 500, and is reflected back and forth multiple times between the side walls of the light mixing module 500 before being emitted, thereby achieving uniform light mixing.

[0034] When the traditional LED is directly projected without passing through the light mixing module 500, there will be a problem that the brightness in the middle of the light spot is high, while the brightness around the light spot is low, which affects the lighting effect. Compared with using an integrator and a light guide to mix the light beam emitted by the LED, the light mixing module 500 of the present technical solution mixes the light through diffuse reflection, and the light mixing effect is more uniform. And for the light source with multiple LEDs 100 arranged, the light guide or integrator is set in a one-to-one correspondence with the LEDs 100, and then the light is mixed. Dark areas are easily generated between adjacent LEDs 100, while the light mixing module 500 mixes the entire light source group, making the formed light spot more uniform.

[0035] The LED 100 may be a single color or a multi-color LED 100. The light emitted by the LED 100 enters the light mixing module 500 and is reflected back and forth for multiple times, thereby projecting a light beam with uniform color mixing and no obvious color block in the light spot.

[0036] The shape of the light mixing module 500 is designed according to the shape formed by the arrangement of the LEDs 100. Thus, the light mixing module 500 can cover the LEDs 100 to prevent light leakage from the LEDs 100. For example, when the LEDs 100 are arranged in a matrix, the light mixing module 500 is also designed in a matrix; when the LEDs 100 are arranged in a circular shape, the light mixing module 500 is also designed in a circular shape; when the LEDs 100 are arranged in a spiral shape, the light mixing module 500 is arranged in a spiral shape.

[0037] Furthermore, the light mixing module 500 is composed of a plurality of light mixing components of annular design and different sizes, the centers of the light mixing components are on the same axis, and the light mixing components are arranged from small to large and from inside to outside, with gaps between adjacent light mixing components. The light mixing components are concentrically arranged so that the gap between two light mixing components is annular, and the width of the same annular gap is uniform, thereby ensuring that the light emitted by the LEDs in the same annular gap has a consistent degree of mixing and uniform brightness of the light spot.

[0038] Optionally, the widths of the annular gaps formed between adjacent light-mixing components are equal, so as to ensure that the light emitted by the LED 100 has a uniform light spot after being mixed by each corresponding circle of the light-mixing components.

[0039] Optionally, the height h of the light mixing components is consistent, so that the reflection path of the light emitted by the LED in the gap of the light mixing components is consistent, thereby ensuring more uniform color mixing.

[0040] Optionally, the height of the light mixing component may also be set to different heights, and gradually increase from the inside to the outside, such as being arranged in a stepped shape.

[0041] Among them, a small part of the light emitted by the LED 100 is directly emitted through the gap, and a large part of the light enters the light mixing component at a certain angle and is projected onto the side wall of the light mixing component, and is reflected back and forth multiple times, so that the light is mixed and then emitted to form a uniform light spot.

[0042] like Figure 2 As shown, in a preferred embodiment of the present invention, a collimating lens 400 is provided between the LED 100 and the light mixing module 500, and the collimating lens 400 is close to the LED 100. The light emitted by the LED 100 enters the collimating lens 400 to the maximum extent, and the collimating lens 400 achieves a collimating effect on the light emitted by the LED 100, so that the light beam emitted by the LED 100 enters the light mixing module 500 at a nearly vertical angle, reducing the light loss caused by excessive reflection times of the light emitted by the LED 100, and improving the utilization rate of the light emitted by the LED 100.

[0043] The collimating lens 400 lens frame is fixedly installed above the LED 100 and is in close contact with the LED 100, and the light incident surface of the light mixing module 500 is in close contact with the collimating lens 400. The collimating lens 400 includes a plurality of collimating units 410, and the collimating units 410 correspond to the LEDs one by one, so as to achieve a more accurate collimation effect on the LED 100.

[0044] like Figure 2 and Figure 3 As shown, in a preferred embodiment of the present invention, a collimating lens 400, an atomizing assembly 600 and a lens assembly 700 are sequentially arranged along the light emitting direction of the LED 100, and the light mixing module 500 is arranged between the collimating lens 400 and the atomizing assembly 600. The atomizing assembly 600 softens the light emitted by the light mixing module 500 to achieve a light atomization effect.

[0045] Among them, the atomization component 600 is composed of a plurality of vertically designed atomization leaves 610 arranged radially from the center to the outside. A central tube 620 is provided in the center of the atomization component 600, and the atomization leaves 610 are rotatably pivoted to the central tube 620. The pivot position of each atomization leaf 610 and the number of atomization leaves 610 can be set as needed.

[0046] Optionally, the atomization component 600 is an atomization sheet, or other components that can soften the light emitted by the LED.

[0047] like Figure 1 As shown, in this embodiment, the LED mixing system also includes a high-power LED 101 installed at the center of the PCB board 110, and a pattern sheet 200 and a reflective module 300 arranged along the light emitting direction of the high-power LED 101. The reflective module 300 is fixedly installed above the high-power LED 101 through a fixed bracket and is tightly attached to the high-power LED. The pattern sheet 200 is installed between the high-power LED 101 and the reflective module.

[0048] The reflective module 300 is cylindrical in design and passes through the center of the collimating lens 400 , the center of the light mixing module 500 , and the center of the atomizing assembly 600 .

[0049] Optionally, the reflective module 300 is a hollow light guide tube with a mirrored interior, or a light guide body.

[0050] The light emitted by the high-power LED 101 passes through the pattern sheet 200 and enters the reflective module 300, projecting a light spot with multiple patterns, which is combined with the light spot formed in the light path where the LED 100 is located to achieve a composite effect of pattern and dyeing.

[0051] The colors of the high-power LED 101 and the LED 100 are different, so that the pattern effect is more obvious.

[0052] like Figure 4 As shown, in the embodiment, the gap width L of the light mixing module 500 is less than or equal to the width of a single LED 100 .

[0053] Since the light beam emitted by the LED 100 conforms to the Lambertian distribution, the width L of the gap is controlled so that the light emitted by the LED 100 can be projected onto the side wall of the light mixing module 500, so that the light emitted by the LED 100 is reflected on the side wall to achieve the purpose of light mixing. When the gap of the light mixing module 500 is narrower, more light can be projected onto the side wall, so that the light emitted by the LED 100 is mixed more fully. At the same time, by reducing the width L of the gap, the reflection distance of the light emitted by the LED 100 in the gap can be shortened, and the number of reflections of the light emitted by the LED 100 in the gap can be increased.

[0054] In a preferred embodiment of the present invention, the ratio between the gap width L of the light mixing module 500 and the height h of the light mixing module 500 is between 1 / 8 and 1 / 3, thereby ensuring the reflection stroke of the light emitted by the LED 100 in the gap of the light mixing module 500, thereby ensuring the number of reflections, so that the light emitted by the LED 100 can be more fully mixed in the light mixing module 500.

[0055] Among them, when the light emitted by the LED 100 is reflected and mixed in the gap of the light mixing module 500, the number of reflections is 2 to 5 times, which is enough to achieve the effect of light mixing, color mixing, and uniform light spot. After calculation, when the ratio of the gap width L of the light mixing module 500 to the height h of the light mixing module 500 is 1 / 3, the number of times the light is reflected in the gap of the light mixing module 500 can reach 2 to 3 times; when the ratio of the gap width L of the light mixing module 500 to the height h of the light mixing module 500 is 1 / 8, the number of times the light is reflected in the gap of the light mixing module 500 can reach more than 5 times. And when the difference between the gap width L of the light mixing module 500 and the height h of the light mixing module 500 is greater, the greater the process difficulty, resulting in higher cost.

[0056] In a preferred embodiment of the present invention, the side wall of the light mixing module 500 forms a light reflecting surface, and the side wall of the light mixing module 500 is roughened, so that the light beam is diffusely reflected on the side wall of the light mixing module 500 .

[0057] Preferably, the cylinder 510 is made of metal, and the light mixing module 500 made of metal has good heat dissipation performance, strong plasticity, and is easy to bend. The side wall of the cylinder 510 forms a light reflection surface, and the side wall of the light mixing module 500 is sprayed with matte paint or frosted to achieve a diffuse reflection effect.

[0058] After the roughening treatment, the side wall of the light mixing module 500 forms a small and uniform concave and convex surface, so that the light beam is diffusely reflected between the side walls of the light mixing module 500, and the different light beams are fully mixed, and finally emitted from the exit surface of the light mixing module 500, so as to achieve a good light mixing effect. The problem that the reflection angle of the light beam passing through the smooth mirror or glass surface is too uniform, resulting in insufficient divergence of the reflection angle, etc., is improved.

[0059] Optionally, the cylinder 510 may also be made of other materials, such as single-sided glass, and the surface of the single-sided glass is roughened to obtain fine and uniform concave and convex feeling, and also to achieve diffuse reflection of the light beam.

[0060] like Figure 5 and Figure 6 As shown, in a preferred embodiment of the present invention, the LEDs 100 are radially distributed from the center to the outside, and the light mixing component is in the shape of a cylinder 510. The shape of the light mixing module 500 matches the arrangement of the LEDs 100, so that the light emitted by the LEDs 100 can enter the light mixing module 500 as much as possible, thereby improving the utilization rate of the light emitted by the LEDs 100.

[0061] The light mixing module 500 is composed of a plurality of cylinders 510 with different radii, and the centers of the cylinders 510 are on the same axis. The radii of the cylinders 510 gradually increase from the inside to the outside, and gaps are left between adjacent cylinders 510 .

[0062] like Figure 7 As shown, in a preferred embodiment of the present invention, a fixing bar 800 is provided on the bottom or top surface surrounded by the plurality of cylinders 510 , and the fixing bar 800 is located between the installation positions of two adjacent LEDs 100 , and the cylinders 510 are connected and fixed by the fixing bar 800 .

[0063] The light mixing components are connected and fixed by the fixing strip 800 to form a whole and are fixed to form the light mixing module 500. Since the fixing strip 800 is small in size and is located between the installation positions of two adjacent LEDs 100, the light path emitted by the LEDs 100 is not blocked.

[0064] The fixing strip 800 may be fixedly connected to the cylinder 510 by welding or gluing.

[0065] Example 2

[0066] The difference between this embodiment and the first embodiment is that the fixing strip 800 is a comb-shaped fixing piece, the cylinders 510 are connected and fixed by the comb-shaped fixing piece, and the comb teeth of the comb-shaped fixing piece extend into the cylinders 510 .

[0067] The comb-shaped fixing member fixes the light mixing component into the light mixing module 500, which is convenient for installation. The comb teeth spacing of the comb-shaped fixing member is slightly less than or equal to the side wall thickness of the cylinder, so that the comb-shaped structure clamps the light mixing component, thereby making the light mixing module 500 more stable. And the comb-shaped fixing member is located between the installation spacing of two adjacent LEDs 100, so that the light path emitted by the LEDs 100 is not blocked.

[0068] Preferably, the comb-shaped fixing member pair is located between the installation positions of two adjacent LEDs 100 .

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An LED light mixing system, characterized in that: The invention comprises a plurality of LEDs arranged in a certain pattern or shape and a PCB board for mounting the LEDs, wherein a light mixing module is arranged in the light emitting direction of the LEDs, the shape of the cross section of the light mixing module matches the shape formed by the arrangement of the LEDs, and the light mixing module is provided with a gap for the light emitted by the LEDs to pass through, and at least part of the light emitted by the LEDs is reflected and mixed by the side wall of the gap formed by the light mixing module before being emitted, and a collimating lens is arranged between the LEDs and the light mixing module, and the collimating lens is closely attached to the LEDs, and the collimating lens is used to reduce the number of reflections of the light emitted by the LEDs at the light mixing module.

2. The LED light mixing system according to claim 1, characterized in that: The light mixing module is composed of a plurality of light mixing components of annular design and different sizes. The centers of the light mixing components are on the same axis and are arranged from small to large and from inside to outside, with gaps between adjacent light mixing components.

3. The LED light mixing system according to claim 1, characterized in that: It also includes a collimating lens, an atomizing assembly and a lens assembly which are sequentially arranged along the light emitting direction of the LED, and the light mixing module is arranged between the collimating lens and the atomizing assembly.

4. The LED light mixing system according to claim 1, characterized in that: The gap width of the light mixing module is smaller than or equal to the width of a single LED.

5. The LED light mixing system according to claim 1, characterized in that: The ratio between the gap width of the light mixing module and the height of the light mixing module is between 1 / 8 and 1 / 3.

6. The LED light mixing system according to claim 1, characterized in that: The side wall of the light mixing module forms a reflection surface of the light beam, and the side wall of the light mixing module is roughened, so that the light beam is diffusely reflected on the side wall of the light mixing module.

7. The LED light mixing system according to claim 2, characterized in that: The LEDs are distributed radially from the center outwards, and the light mixing component is cylindrical.

8. The LED light mixing system according to claim 7, characterized in that: The bottom surface and / or the top surface surrounded by the plurality of cylinders are provided with fixing strips, and the fixing strips are correspondingly located between the installation positions of any two adjacent LEDs, and the cylinders are connected and fixed by the fixing strips.

9. The LED light mixing system according to claim 7, characterized in that: The bottom surface and / or the top surface surrounded by the plurality of cylinders are provided with a comb-shaped fixing piece, the cylinders are connected and fixed by the comb-shaped fixing piece, and the comb teeth of the comb-shaped fixing piece extend into the cylinders.

Images