CN108469008B

CN108469008B - Light uniformizing device and lighting device

Info

Publication number: CN108469008B
Application number: CN201810162434.XA
Authority: CN
Inventors: 刘军
Original assignee: Journey Technology Ltd
Current assignee: Journey Technology Ltd
Priority date: 2018-01-18
Filing date: 2018-02-27
Publication date: 2020-02-21
Anticipated expiration: 2038-02-27
Also published as: CN108469008A

Abstract

The invention discloses a light uniformizing device and an illuminating device. The light uniformizing device comprises: the light-in surface, the light-out surface and the side surface. The light incident surface and the light emergent surface are parallel and opposite; the side face is connected with the light incident face and the light emergent face to form a cavity; the light incident surface is provided with a light source opening used for enabling a light source to enter the cavity after passing through; the light incident surface and the side surface are reflecting films; the light emitting surface is a reflection type transmittance control film. The light reaching the light emitting surface is partially reflected and partially emitted, the light reaching the light incident surface and the side surface is reflected, and the emergent light of the light source is reflected for multiple times in the cavity and emitted through the light emitting surface, so that the uniform light is realized. Because no special requirement is required for the position of the light source, the distance between the parallel light incident surface and the parallel light emergent surface can be set very close, so that the volume of the light uniformizing device is reduced, and the energy utilization rate is further improved.

Description

Light uniformizing device and lighting device

Technical Field

The invention relates to the field of illumination, in particular to a light homogenizing device and an illuminating device.

Background

The uniformity of the illumination light source is one of the core parameters of the light source, and the quality of the illumination light source directly determines the performance of the light source. Conventional light uniformizing methods include an integrating sphere light uniformizing method, a light rod light uniformizing method, and a fresnel lens light uniformizing method.

In the integrating sphere dodging method, the integrating sphere is a hollow sphere with an inner wall coated with a white diffuse reflection material. One or more window holes are formed on the wall of the integrating sphere and are used as a light inlet hole, a light outlet hole, a receiving hole for placing a light receiving device and the like. The light entering the integrating sphere is reflected for multiple times by the inner wall coating to form uniform illumination on the inner wall. When the light source area is certain and needs higher even gloss, the diameter of the sphere needs to be set very large, and the coupled energy is far lower than that of the light source, so that the energy utilization rate is very low.

In the light bar dodging method, a hollow light bar is generally plated with a reflecting film, and a solid light bar is generally made of quartz glass. Light is reflected for multiple times in the light bar, a virtual light source image can be formed by each reflection, and a two-dimensional virtual light source matrix is formed by multiple reflections, so that the light is more uniform. The light-homogenizing rod has a tendency of oscillation and rise along with the increase of the length, so that the length needs to be set to be long in order to obtain a good light-homogenizing effect.

In the Fresnel lens dodging method, one surface of a Fresnel lens is a smooth surface, and the other surface of the Fresnel lens is recorded with concentric circles from small to large, wherein the recorded textures are designed by utilizing interference of light and according to the requirements of relative sensitivity and receiving angle. When the Fresnel lens is used as a light uniformizing lens, light emitted by the light source at the focal point position of the Fresnel lens is converted into parallel light to be emitted, so that the effects of beam shaping and light source light uniformization are achieved. Because the light source must be placed on the focus of the fresnel lens, the length in the direction perpendicular to the fresnel lens needs to be set very large, and the fresnel lens has high requirements for the processing precision of inscription textures, so that it is difficult to prevent mutual crosstalk between each concentric circle, resulting in an unsatisfactory light-equalizing effect.

Disclosure of Invention

The embodiment of the invention provides a light uniformizing device and an illuminating device. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

In a first aspect, an embodiment of the present invention provides a light uniformizing apparatus, including: a light incident surface, a light emitting surface and a side surface;

the light incident surface and the light emergent surface are parallel and opposite; the side face is connected with the light incident face and the light emergent face to form a cavity;

the light incident surface is provided with a light source opening used for enabling a light source to enter the cavity after passing through;

the light incident surface and the side surface are reflecting films;

the light emitting surface is a reflection type transmittance control film.

Based on the light uniformizing device, as an optional first embodiment, the reflective transmittance control film takes an axis of the light source as a center, and includes more than two symmetrical shapes with different sizes, and a ring between every two symmetrical shapes is a film layer.

Based on the first embodiment, as an optional second embodiment, the transmittance of the film layer close to the center is smaller than that of the film layer far from the center.

Based on the first embodiment, as an optional third embodiment, the size of the ring near the center is smaller than the size of the ring far from the center.

Based on the first embodiment, as an optional fourth embodiment, the center is a circle center, and the symmetric shape is a circle.

As an optional fifth embodiment, based on the light unifying apparatus and any one of the first to fourth embodiments, the light unifying apparatus further includes: a prism;

the prism is located in the cavity and on the reflective transmittance control film, and the top end faces the light source.

Based on the fifth embodiment, as an optional sixth embodiment, the central axis of the prism coincides with the axis of the light source.

In a second aspect, an embodiment of the present invention provides a lighting device, including: a light source and a light evening device;

the light uniformizing device comprises: a light incident surface, a light emitting surface and a side surface;

the light incident surface is provided with a light source opening for enabling the light source to enter the cavity after passing through;

the light incident surface and the side surface are reflecting films;

the light emitting surface is a reflection type transmittance control film.

Based on the lighting device, as an optional first embodiment, the reflective transmittance control film includes two or more symmetrical shapes with different sizes, centered on the axis of the light source, and a ring between each two symmetrical shapes is a film layer.

In the light uniformizing device and the illumination device in the embodiment of the invention, the light reaching the light emitting surface is partially reflected and partially emitted, and the light reaching the light incident surface and the side surface is reflected, so that the emergent light of the light source is reflected for multiple times in the cavity and emitted through the light emitting surface, and the light uniformizing is realized. Because no special requirement is required for the position of the light source, the distance between the parallel light incident surface and the parallel light emergent surface can be set very close, so that the volume of the light uniformizing device is reduced, and the energy utilization rate is further improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic view of a light unifying apparatus in an exemplary embodiment;

FIG. 2 is a schematic diagram of a light exit surface of a light unifying device in an exemplary embodiment;

FIG. 3 is a schematic view of a light unifying apparatus in an exemplary embodiment.

Detailed Description

The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

In an exemplary embodiment, the light unifying means includes: the light-in surface, the light-out surface and the side surface.

The light incident surface and the light emergent surface are parallel and opposite.

The side surface is connected with the light incident surface and the light emergent surface to form a cavity.

The light incident surface is provided with a light source opening hole for enabling the light source to enter the cavity after passing through.

The light incident surface and the side surface are provided with reflecting films.

The light-emitting surface is a reflection type transmittance control film.

The reflective transmittance control film is a film layer for controlling the transmittance of the transmitted light in a mode of increasing or decreasing the reflectance, so that the emergent light of the light-emitting surface has higher uniformity, and specific parameters can be selected according to application requirements.

Therefore, in the light uniformizing device in the exemplary embodiment, the light reaching the light emitting surface is partially reflected and partially emitted, and the light reaching the light incident surface and the side surface is reflected, so that the emergent light of the light source is reflected for multiple times in the cavity and emitted through the light emitting surface, and the light uniformizing is realized. Because no special requirement is required for the position of the light source, the distance between the parallel light incident surface and the parallel light emergent surface can be set very close, so that the volume of the light uniformizing device is reduced, and the energy utilization rate is further improved.

In an exemplary embodiment, as shown in fig. 1 and 2, the light unifying means includes: a light-in surface 11, a light-out surface 12 and a side surface 13. The thick solid line arrows in fig. 1 are used to indicate the structures denoted by reference numerals, and the thin solid line arrows represent light paths. The two side faces 13 parallel to the paper face are not indicated in fig. 1.

The light incident surface 11 and the light emitting surface 12 are parallel and opposite, and 4 side surfaces 13 are connected with the light incident surface 11 and the light emitting surface 12 to form a cavity. The cavity can be in various forms such as an air cavity, a vacuum cavity or an optical material cavity.

The light incident surface 11 has a light source opening for allowing the light source 14 to enter the cavity after passing through.

The light incident surface 11 and the side surface 13 are reflective films with high reflectivity, and specifically include two possible cases, in which the light incident surface 11 and the side surface 13 are reflective films themselves, or the light incident surface 11 and the side surface 13 are plated with reflective films on the surfaces in the cavity, and when the cavity is an air cavity, the second case may be selected, and when the cavity is an optical material cavity, the first case may be selected. The reflectivity of the reflective film, the specific value of which can be selected according to the application needs. The reflective film can be an internal reflective film or an external reflective film, and since the reflective efficiency of the external reflective film is generally greater than that of the internal reflective film, the reflective film can be selected according to the requirement of light energy utilization rate.

The light emitting surface 12 is a reflective transmittance control film, which includes two possible cases, that is, the light emitting surface 12 itself is a reflective transmittance control film, or the light emitting surface 12 is made of a light transmitting material, and a reflective transmittance control film is plated on the surface in the cavity.

In the exemplary embodiment, the reflective transmittance control film is centered on the axis of the light source 14, and includes two or more circles with different diameters, and the ring between each two circles is a film layer.

And coating the different film layers respectively. Different films can have different transmittances, the selection of the transmittance is related to the characteristics of the light source, and for the point light source, the principle of the transmittance selection is that the transmittance of the film close to the circle center is smaller than that of the film far away from the circle, so that the uniformity of emergent light is improved.

When the number of the circular rings is more, the light uniformizing effect is better, and different circular ring numbers can be selected according to application requirements.

The rings may be of the same size. The rings may also have different sizes, for example the closer to the centre the rings are, the denser the rings are.

In the exemplary embodiment, a circular shape is disposed on the light emitting surface, in some cases, the reflective transmittance control film may also include two or more symmetrical shapes with different sizes based on the axis of the light source 14, and a ring between each two symmetrical shapes is a film layer. The number and size of the rings, the permeability of each layer, etc. are selected as described above for the circular shape.

In an exemplary embodiment, as shown in fig. 3, the light unifying means includes: a light incident surface 11, a light emitting surface 12, a side surface 13, and a triangular prism 15. The thick solid line arrows in fig. 3 are used to indicate the structures denoted by the reference numerals, and the thin solid line arrows represent the optical paths. The two side faces 13 parallel to the paper face are not indicated in fig. 3.

The light incident surface 11 has a light source opening 111 for allowing the light source 14 to enter the cavity after passing through.

The light incident surface 11 and the side surface 13 are high-reflectivity reflective films, and the specific value of the reflectivity can be selected according to application requirements.

The light emitting surface 12 is a reflective transmittance control film.

A triangular prism 15 is positioned in the cavity on the reflective transmittance controlling film with the top end facing the light source 14. Further, the center axis of the triangular prism 15 coincides with the axis of the light source 14.

The part outlined by the dashed line in fig. 3 is a partial enlarged view of the triangular prism 15, and it can be seen that the emergent light right in front of the light source 14 forms a small uniform light surface after passing through the triangular prism 15, and the uniform light surface passes through the reflective transmittance control film, so that the uniform light effect can be further improved. Therefore, the triangular prism 15 is added to the light uniformizing device, and the uniformity of the light emitted from the light source 14 in front of the light uniformizing device can be improved.

The reflective transmittance control film in the present exemplary embodiment may still be provided in a symmetrical shape with the axis of the light source 14 as the center, as described above, so as to provide different film layers, which will not be described herein again.

The triangular prism in the present exemplary embodiment is merely an example, and a trapezoidal prism or the like may be used.

It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. A light unifying apparatus, comprising: a light incident surface, a light emitting surface and a side surface;

the light incident surface and the side surface are reflecting films;

the light emitting surface is a reflection type transmittance control film;

the light uniformizing device further comprises: a prism;

2. The light unifying apparatus of claim 1, wherein the reflective transmittance control film is centered on the axis of the light source and comprises two or more symmetrical shapes of different sizes, with one film layer in the ring between each two symmetrical shapes.

3. The light unifying apparatus according to claim 2, wherein the transmittance of the film layer closer to the center is less than the transmittance of the film layer farther from the center.

4. The light unifying apparatus according to claim 2 wherein the dimension of the ring proximate to the center is smaller than the dimension of the ring distal to the center.

5. The light unifying apparatus according to claim 2, wherein the center is a center of a circle and the symmetrical shape is a circle.

6. The light unifying apparatus according to claim 5 wherein the central axis of the prism coincides with the axis of the light source.

7. An illumination device, comprising: a light source and a light evening device;

the light incident surface and the side surface are reflecting films;

the light emitting surface is a reflection type transmittance control film;

the light uniformizing device further comprises: a prism;

8. The illumination device of claim 7, wherein the reflective transmittance control film is centered on the axis of the light source and comprises two or more symmetrical shapes of different sizes, with a ring between each two symmetrical shapes being one film layer.

9. The illumination device of claim 8, wherein the transmittance of the film layer near the center is less than the transmittance of the film layer away from the center.