TWM554247U - Non-coaxial light blending device - Google Patents

Abstract

A non-coaxial light mixing device includes a light emitting unit and at least one light mixing element. The light emitting unit has a substrate and a plurality of light emitting diodes. The light mixing element is a polygonal columnar light guide and has a light incident surface. The center point of the light surface can define an X axis parallel to the light emitting direction of the light emitting diodes, and the light emitting surfaces of the light emitting diodes are all deviated from the intersection point of the X axis and the substrate. As a result, the center of the light emitting surface of the light emitting diode does not correspond to the center point of the light incident surface of the light mixing element, so that all light emitted by the light emitting diode will not be directed to the center point of the light incident surface along the X axis. Situation, so it has better light mixing effect.

Description

Non-coaxial light mixing device

This creation relates to a light mixing device, specifically a light mixing device that uses a multi-color light emitting diode as a light source and mixes light with a polygonal light guide to provide uniform light mixing and color lighting effects.

Light-emitting diodes have the advantages of power saving and long life. However, the wavelength range and illuminance of light emitted by different types of light-emitting diodes have their limits. Therefore, when using light-emitting diodes as light sources, many different colors are used. The light-emitting diodes form a light-emitting diode array, and use a light-mixing unit to mix light emitted from the light-emitting diode array to produce a high-illumination and uniform lighting effect.

China's invention patent No. CN101515423A discloses a diode display device having a light emitting diode array, a light mixing element, and a light path correction element, but the light emitting diode array and the light mixing element are not optimized for design. The effect is still not good enough and needs to be improved.

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

A non-coaxial light mixing device provided by the author includes: a light-emitting unit having a substrate and a plurality of light-emitting diodes disposed on the substrate, the light-emitting diodes having a light-emitting surface; And at least one light mixing element is a polygonal cylindrical light guide, having a light-emitting surface close to the light-emitting surface of the light-emitting diode and a light-emitting surface opposite to the light-incident surface. The center point of the light-incident surface can define and emit light. An X axis in which the light emitting directions of the diodes are parallel; wherein, the light emitting surfaces of the light emitting diodes are all offset from an 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 positions of the center points of the light-entering surfaces of the light-mixing elements, so that all the light emitted by the light-emitting diodes will not be directed to the light-entering surfaces along the X axis The situation of the center point, so that all the light emitted by the light-emitting diode can be fully mixed in the light mixing element. Therefore, it has better light mixing effect.

10‧‧‧ Non-coaxial light mixing device

20‧‧‧Light-emitting unit

21‧‧‧ substrate

22‧‧‧light-emitting diode

30‧‧‧ Light mixing element

31‧‧‧Into the light surface

32‧‧‧light surface

33‧‧‧Reflective coating

40‧‧‧first lens unit

41‧‧‧Single convex lens

42‧‧‧Biconvex lens

50‧‧‧Second lens unit

51‧‧‧Single convex lens

52‧‧‧Biconvex lens

53‧‧‧Single convex lens

X‧‧‧X-axis direction

Y‧‧‧Y-axis direction

Z‧‧‧Z axis direction

FIG. 1 is a schematic diagram of a first embodiment provided by the author.

FIG. 2A is a schematic diagram of a light-emitting diode emitting surface in the first embodiment provided by the author.

FIG. 2B is a partially enlarged view of the first embodiment provided by the author.

FIG. 3 is a schematic diagram of a light path of the first embodiment provided by the author.

FIG. 4 is a schematic diagram of a second embodiment provided by the author.

FIG. 5 is a schematic diagram of a third embodiment provided by the author.

In order to specifically explain the structural features and effects of this creation, the following several embodiments are provided and described in detail in conjunction with the drawings. This creation provides the non-coaxial light mixing device 10 of the first embodiment. Please refer to FIGS. 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. The light-emitting unit 20 is composed of a substrate 21 and a plurality of light-emitting diodes 22 disposed on the substrate 21. The light-emitting diodes 22 have a light-emitting surface. The description is described with the light emitting direction of the light emitting surface as the front, so as to conform to the ordinary understanding of those skilled in the art.

As shown in FIG. 1, the light mixing element 30 is a rectangular columnar light guide, and has a light incident surface 31 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 surface 31 combined with the light-emitting direction of the light-emitting diode can define the X-axis extending along the longitudinal direction of the light-mixing element 30, and further define the Y-axis and the Z-axis (that is, forming a right angle) that intersect the X-axis and are perpendicular to each other Coordinate System). In this embodiment, the light mixing element 30 is a solid structure and its cross-section is square. Therefore, the light mixing element 30 has side lengths parallel to the X-axis, Y-axis, and Z-axis, respectively. The length, width, and height of the optical element 30. In this embodiment, the aforementioned ratio of length to width is preferably 5 to 14, which can provide better light mixing effect. Secondly, a person skilled in the art can also change the cross section of the light mixing element 30 to a rectangular shape, and the ratio of the width to the height is preferably 1.3 or less. Of course, those skilled in the art can also change the cross section of the light mixing element 30 to other polygons, such as a hexagon or an octagon.

Please refer to FIGS. 2A and 2B. The substrate 21 of the light-emitting unit 20 is provided with four light-emitting diodes 22 that emit red, green, blue, and white light, respectively. The light-emitting direction is parallel to the X-axis of the light-mixing element 30. 21 can be divided into four quadrants by using the projection of the Y axis and the Z axis of the light mixing element 30 along the X axis direction. The aforementioned light emitting diodes 22 are arranged at equal intervals and are respectively distributed in the four quadrants. Therefore, the light emitting surface of the light emitting diode 22 does not intersect the X-axis extension line of the light mixing element 30. In other words, the light-emitting surfaces of the light-emitting diodes 22 are all deviated from the intersection of the X-axis and the substrate, which also indicates that the centers of the light-emitting surfaces of the light-emitting diodes 22 do not correspond to the center of the light-entering surface 31 of the light mixing element 30 The location of the point. In this way, part of the light emitted by the light-emitting diode 22 will not be directed toward the center point of the light incident surface 31 along the X-axis direction, thereby allowing All light emitted by the photodiode 22 can be fully mixed during the process of propagation and diffusion in the light mixing element 30.

It is added that, in this embodiment, the distance between the light emitting surface of the 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 to ensure that the light emitting diode 22 The emitted light can enter the light mixing element 30.

In addition to the aspects of the foregoing embodiments, those skilled in the art can adjust the number and position 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. The X-axis of the light mixing element 30 is used as a center and arranged in a circular ring at an equal angle (that is, located at a triangular point of a virtual regular triangle). Regardless of the change, as long as the center points of the light emitting surfaces of all the light-emitting diodes 22 are maintained away from the center point of the light-incident surface 31, the light emitted by the light-emitting diodes 22 will not have a small portion along the X axis direction A case where it is directed toward the center point of the light incident surface 31.

Referring to FIG. 3, the first lens unit 40 is disposed near the light exit surface 32 of the light mixing element 30. The first lens unit 40 has a single convex lens 41 and a double convex lens 42 that are forwardly convex, and are used to provide optical path correction and light focusing effects. The required light shape and luminous flux.

Please refer to FIG. 4 for the second embodiment provided by the author. The main structure is substantially the same as the first embodiment. The main difference is that the light mixing element 30 is a hollow structure, and 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 are in terms of the internal space boundary of the light mixing element 30.

Please refer to FIG. 5 again for the third embodiment provided by the author. The main structure is substantially the same as the 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 a single convex lens 51, double The convex lens 52 and the rear convex single convex lens 53 are also used to provide the light path correction and the condensing 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 rear side of the light mixing element 30, which can provide a good optical path correction effect. It is worth mentioning that, in certain cases, the lens unit may not be provided. In addition, the light mixing element 30 may also be used with another light mixing element. The other light mixing element may be of another configuration or type. Light element.

With the foregoing structure, all light emitted by the creative light-emitting diode 22 will not strike the center point of the light-incident surface 31 along the X-axis direction, so a better light-mixing fruit will be produced than in the prior art.

10‧‧‧ Non-coaxial light mixing device

20‧‧‧Light-emitting unit

30‧‧‧ Light mixing element

32‧‧‧light surface

40‧‧‧first lens unit

41‧‧‧Single convex lens

42‧‧‧Biconvex lens

Claims (10)

A non-coaxial light mixing device includes: a light-emitting unit having a substrate and a plurality of light-emitting diodes disposed on the substrate, each light-emitting diode having a light-emitting surface, and the light-emitting diodes emit light. The light includes at least two light emitting wavelength colors; and at least one light mixing element is a polygonal cylindrical light guide, having a light incident surface close to the light emitting surfaces of the light emitting diodes, and a light output opposite to the light incident surface. Surface, the center point of the light incident surface can define an X axis parallel to the light emitting direction of the light emitting diodes; wherein the light emitting surfaces of the light emitting diodes are all offset from an intersection point of the X axis and the substrate . The non-coaxial light mixing device according to claim 1, wherein a cross-sectional shape of the light mixing element is a quadrangle, a hexagon, or an octagon. The non-coaxial light mixing device according to claim 1, wherein a cross-sectional shape of the light mixing element is rectangular, and a side length ratio of the rectangle is between 1 and 1.3. The non-coaxial light mixing device according to claim 3, wherein the longitudinal length of the light mixing element is 5 to 14 times the length of the rectangular side. The non-coaxial light mixing device according to claim 3, wherein a distance between a light emitting surface of the light emitting diodes and a light incident surface of the light mixing element is smaller than a height of the light mixing element. The non-coaxial light mixing device according to any one of claims 1 to 5, wherein the light mixing element has a solid structure. The non-coaxial light mixing device according to any one of claims 1 to 5, wherein the light mixing element has a hollow structure, and a reflective coating is provided inside the light mixing element. The non-coaxial light mixing device according to claim 1, wherein the light mixing element defines a Y axis and a Z axis that intersect the X axis and are perpendicular to each other. The X-axis projection is divided into four quadrants, the number of these light-emitting diodes is four, and the two are equally spaced. The arrangement is distributed in these quadrants. The non-coaxial light mixing device according to claim 1, wherein the light-emitting diodes are arranged in a circular ring at an equal angle with the X axis as a center. The non-coaxial light mixing device according to claim 1, further comprising at least one lens unit disposed on the light incident surface or the light exit surface of the light mixing element.