CN207349826U - non-coaxial light mixing device - Google Patents

Abstract

A non-coaxial light mixing device is provided with a light emitting unit and at least one light mixing element, wherein the light emitting unit is provided with a substrate and a plurality of light emitting diodes, the light mixing element is a polygonal columnar light guide body and is provided with a light incoming surface, an X axis parallel to the light emitting directions of the plurality of light emitting diodes can be defined through the central point of the light incoming surface, and the light emitting surfaces of the plurality of light emitting diodes deviate from the intersection point of the X axis and the substrate. Therefore, the centers of the light emitting surfaces of the light emitting diodes do not correspond to the center point of the light incident surface of the light mixing element, so that all light rays emitted by the light emitting diodes cannot be emitted to the center point of the light incident surface along the X axis, and a better light mixing effect is achieved.

Description

Non-coaxial light mixing device

technical field

The utility model relates to a light mixing device, in particular to a light mixing device which uses a multi-color light-emitting diode as a light source and is matched with a polygonal light guide column for light mixing, and provides uniform light mixing and colored lighting effects.

Background technique

Light-emitting diodes have the advantages of power saving and long life, but the wavelength range and illuminance of light emitted by different types of light-emitting diodes have their limitations. Therefore, when using light-emitting diodes as light sources, many light-emitting diodes of different colors will be used to form a light-emitting diode array. , and use a light mixing unit to mix the light emitted by the aforementioned LED array to produce a high-illuminance and uniform lighting effect.

China Patent No. CN101515423A discloses a diode display device, which has a light emitting diode array, a light mixing element and an optical path correction element, but neither the light emitting diode array nor the light mixing element has been optimally designed, and the light mixing effect is still not good enough. Needs to be improved.

Utility model content

In view of this, the purpose of the present invention is to provide a non-coaxial light mixing device with better light mixing effect.

A non-coaxial light mixing device provided by the utility model includes: a light emitting unit having a base plate and a plurality of light emitting diodes arranged on the base plate, each light emitting diode has a light emitting surface; and at least one light mixing element is polygonal columnar The light guide has a light-incident surface close to the light-emitting surface of the plurality of light-emitting diodes, and a light-exit surface opposite to the light-incident surface. The center point of the light-incidence surface can define a An X-axis; wherein, the light-emitting surfaces of the plurality of light-emitting diodes are all deviated from an intersection point of the X-axis and the substrate.

Therefore, the centers of the light-emitting surfaces of the plurality of LEDs do not correspond to the position of the center point of the light-incident surface of the light mixing element, so that all the light emitted by the plurality of LEDs will not enter the light-incident along the X-axis. The situation of the center point of the surface allows all the light emitted by the plurality of light emitting diodes to be fully mixed in the light mixing element. Therefore, it has a better light mixing effect.

Description of drawings

Fig. 1 is a schematic diagram of the first embodiment provided by the utility model.

FIG. 2A is a schematic diagram of the light-emitting surface of the light-emitting diode in the first embodiment of the present invention.

Fig. 2B is a partially enlarged view of the first embodiment provided by the present invention.

Fig. 3 is a schematic diagram of the optical path of the first embodiment provided by the present invention.

Fig. 4 is a schematic diagram of the second embodiment provided by the present invention.

Fig. 5 is a schematic diagram of a third embodiment provided by the present invention.

Explanation of reference signs:

10 Non-coaxial light mixing device

20 Light emitting unit 21 Substrate 22 Light emitting diode

30 Light mixing element 31 Light incident surface 32 Light exit surface

33 reflective coating

40 First lens unit 41 Single convex lens 42 Double convex lens

50 Second lens unit 51 Single convex lens 52 Double convex lens

53 single convex lens

X X-axis direction Y Y-axis direction Z Z-axis direction

Detailed ways

In order to specifically illustrate the structural features and technical effects of the present utility model, the following several embodiments are provided and described in detail with accompanying drawings. The utility model provides the non-coaxial light mixing device 10 of the first embodiment, please refer to Figures 1 to 3, the non-coaxial light mixing device 10 includes a light emitting unit 20, a light mixing element 30 and a first lens unit 40 . Wherein, the light-emitting unit 20 is composed of a substrate 21 and a plurality of light-emitting diodes 22 arranged on the substrate 21, each light-emitting diode 22 has a light-emitting surface, and the following description is described with the light-emitting direction of the light-emitting surface as the front. To conform to the common understanding of those skilled in the art.

As shown in FIG. 1 , the light mixing element 30 is a rectangular columnar light guide, which has a light incident surface 31 located in front of the light emitting surface of the light emitting diode 22, and a light exit surface 32 opposite to the light incident surface 31. The center point of the light incident surface 31 is According to the light emitting direction of the light emitting diode, an X axis extending longitudinally along the light mixing element 30 can be defined, and then a Y axis and a Z axis which intersect with the X axis and are perpendicular to each other can be defined (that is, form a rectangular coordinate system). In this embodiment, the light mixing element 30 is a solid structure with a square cross section, so the light mixing element 30 has side lengths parallel to the X-axis, Y-axis, and Z-axis respectively, and the distance between the aforementioned side lengths is the light mixing The length, width and height of the element 30. In this embodiment, the ratio of the aforementioned length to width is preferably 5 to 14, which can provide a preferred light mixing effect. Secondly, engineers in the field can also change the cross-section of the light mixing element 30 into a rectangle, in which case the ratio of width to height is preferably below 1.3. Of course, engineers in the field can also change the cross-section of the light mixing element 30 into other polygons, such as hexagon or octagon.

Please refer to Figures 2A and 2B, the substrate 21 of the light-emitting unit 20 is provided with four light-emitting diodes 22 to emit red light, green light, blue light and white light respectively, and the light-emitting direction is parallel to the X-axis of the light mixing element 30, and the substrate 21 can be The light mixing element 30 is divided into four quadrants according to the projection of the Y-axis and the Z-axis along the X-axis direction, and the LEDs 22 are arranged in pairs at equal intervals and distributed in the four quadrants respectively. Therefore, the light emitting surface of the aforementioned light emitting diode 22 will not intersect with the extension line of the X axis of the light mixing element 30 . In other words, the light-emitting surfaces of the plurality of light-emitting diodes 22 are all deviated from the intersection point of the X-axis and the substrate, which also means that the centers of the light-emitting surfaces of the plurality of light-emitting diodes 22 do not correspond to the center of the light incident surface 31 of the light mixing element 30 point location. In this way, no part of the light emitted by the LED 22 will be directed toward the central point of the light incident surface 31 along the X-axis direction, so that all the light emitted by the LED 22 can propagate in the light mixing element 30 During the diffusion process, the light is fully mixed.

It is supplemented that, in this embodiment, the distance between the light-emitting surface of the plurality of light-emitting diodes 22 and the light-incident surface 31 of the light-mixing element 30 should be less than the height of the light-mixing element 30, so as to ensure that the plurality of light-emitting diodes emit light. All the light emitted by 22 can enter the light mixing element 30 .

In addition to the implementation of the foregoing embodiments, those skilled in the art can adjust the number and location of the light emitting diodes 22 as needed, for example, three light emitting diodes 22 are set to emit red light, green light and blue light respectively, and the light mixing element The X-axis of 30 is the center and arranged in an equiangular ring (that is, located at a triangular point of a virtual equilateral triangle). No matter how it changes, as long as the center points of the light-emitting surfaces of all the LEDs 22 are kept away from the center points of the light-incident surface 31, so that a small part of the light emitted by all the LEDs 22 will not radiate toward the incident surface along the X-axis direction. The situation of the center point of the smooth surface 31.

Please refer to FIG. 3 , the first lens unit 40 is disposed near the light-emitting surface 32 of the light mixing element 30, and has a single-convex lens 41 and a double-convex lens 42 that are convex forward, which are used to provide optical path correction and light focusing effects, and have obtained the required light shape and luminous flux.

Please refer to Fig. 4 for the second embodiment of the present invention, its main structure is roughly the same as that of the aforementioned first embodiment, the main difference is that the light mixing element 30 is a hollow structure, and the inside of the light mixing element 30 is provided with a reflective coating 33. At this time, the width and height of the light mixing element 30 refer to the internal space boundary of the light mixing element 30 .

Please refer to FIG. 5 again for the third embodiment provided by the present utility model. Its main structure is roughly the same as that of the aforementioned first embodiment. The main difference is that a second lens unit 50 is added between the light mixing element 30 and the light emitting unit 20 , is composed of forward convex single-convex lens 51, double-convex lens 52 and backward convex single-convex lens 53 arranged in sequence from back to front, and is also used to provide optical path correction and light focusing effect.

For those skilled in the art, the lens combination of the lens unit can be adjusted as needed, and can be selectively placed on the front side or the back side of the light mixing element 30 , which can provide a good optical path correction effect. It is worth adding that under certain circumstances, the lens unit may not be provided. In addition, the light mixing element 30 may also be used with another light mixing element. The aforementioned another light mixing element may be a mixing element of other configurations or types light element.

Through the aforementioned structure, all the light emitted by all the light emitting diodes 22 of the present invention will not be directed to the center point of the light incident surface 31 along the X-axis direction, so it will produce a better light mixing effect than the prior art.

Claims (10)

1. A non-coaxial light mixing device, comprising: A light-emitting unit having a substrate and a plurality of light-emitting diodes arranged on the substrate, each light-emitting diode has a light-emitting surface, and the light emitted by the plurality of light-emitting diodes includes at least two light-emitting wavelength colors; and At least one light mixing element, which is a polygonal columnar light guide, has a light-incident surface close to the light-emitting surface of the plurality of light-emitting diodes, and a light-emitting surface opposite to the light-incidence surface. The center point of the light-incidence surface can define an X axis parallel to the light emitting direction of the plurality of light emitting diodes; Wherein, the light-emitting surfaces of the plurality of light-emitting diodes are all deviated from a intersection point between the X-axis and the substrate. 2. The non-coaxial light mixing device as claimed in claim 1, wherein the cross-sectional shape of the light mixing element is quadrilateral, hexagonal or octagonal. 3 . The non-coaxial light mixing device according to claim 1 , wherein the cross-sectional shape of the light mixing element is a rectangle, and the side length ratio of the rectangle is between 1 and 1.3. 4. The non-coaxial light mixing device as claimed in claim 3, wherein the longitudinal length of the light mixing element is 5 to 14 times the side length of the aforementioned rectangle. 5. The non-coaxial light mixing device according to claim 3, wherein the distance between the light emitting surfaces of the plurality of LEDs and the light incident surface of the light mixing element is smaller than the height of the light mixing element. 6. The non-coaxial light mixing device according to any one of claims 1 to 5, wherein the light mixing element is a solid structure. 7. The non-coaxial light mixing device according to any one of claims 1 to 5, wherein the light mixing element is a hollow structure, and a reflective coating is provided inside the light mixing element. 8. The non-coaxial light mixing device according to claim 1, wherein the light mixing element defines a Y axis and a Z axis intersecting the X axis and perpendicular to each other, and the substrate can use the Y axis and the Z axis to X-axis is divided into four quadrants along the projection of the X-axis, the number of the plurality of light emitting diodes is four, and two by two are equally spaced and distributed in the plurality of quadrants. 9 . The non-coaxial light mixing device according to claim 1 , wherein the plurality of LEDs are arranged in an equiangular ring with the X axis as the center. 10. The non-coaxial light mixing device according to claim 1, further comprising at least one lens unit disposed close to the light incident surface or the light output surface of the light mixing element.