CN218348496U

CN218348496U - Optical module for uniform illumination and illumination lamp thereof

Info

Publication number: CN218348496U
Application number: CN202222391020.9U
Authority: CN
Inventors: 朱道勇; 何伟焯; 罗滔
Original assignee: Guangzhou Yidun Optical Design Co ltd
Current assignee: Guangzhou Yidun Optical Design Co ltd
Priority date: 2022-02-28
Filing date: 2022-09-08
Publication date: 2023-01-20
Anticipated expiration: 2032-09-08

Abstract

The utility model discloses an optical module for uniform illumination and an illuminating lamp thereof, which comprises a scattering plate and a light source module arranged at the oblique rear part of an incident plane; the light source module comprises an LED light-emitting element and a reflector, the light-emitting angle of the LED light-emitting element is staggered with the incident surface, the reflector is arranged in the light-emitting direction of the LED light-emitting element, and the reflector is arranged at the oblique rear of the incident surface and faces the incident surface so as to uniformly reflect the emergent light of the LED light-emitting element to the incident surface. The utility model discloses locate the oblique rear of diffuser plate with light source and transmitter, on all equal slant of light shines to the diffuser plate, stopped the defect that lamp pearl bright spot appears on the diffuser plate, do not reduce the light yield simultaneously, its illumination degree of consistency and light-emitting efficiency hold concurrently excellently.

Description

Optical module for uniform illumination and illumination lamp thereof

Technical Field

The utility model belongs to LED grading lens field, concretely relates to an optical module for even illumination and illumination lamps and lanterns thereof.

Background

Indoor lighting places more and more importance on visual comfort, and large-area uniform lighting becomes the mainstream of the technology. The conventional uniform illumination means is realized by using a direct type optical module or a side type light guide plate. The direct type module uniformly arranges light sources, each light source is additionally provided with a diffusion lens and a light homogenizing plate, so that light of the light sources is uniformly irradiated on the light homogenizing plate after being diffused by the lens, and the effect of uniform illumination is realized on the other surface of the light homogenizing plate; and the side-entering type illumination uniformly emits the side-entering light rays from the front surface through internal scattering through the light guide plate with the scattering particles, and the effect of large-area uniform illumination is also realized. However, for the direct type scheme, the currently used light uniformizing plate has high transmittance and low haze, which is beneficial to improving the light transmittance, but the transmittance is high and is difficult to scatter light, so that the direct type can easily see the light emitting points of the LED lamp beads, thereby reducing the illumination uniformity and even generating glare, otherwise, if the haze is improved, the light transmittance is reduced; the side-entry light guide plate can avoid the bright spots of light emission, but has low light transmission efficiency. Each of the above two schemes has disadvantages, and how to realize large-area uniform light-emitting illumination under the application of the low-haze light-transmitting material is a technical challenge facing the LED illumination industry.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, one of the purposes of the utility model is to design another kind of optical module who is used for even illumination, is different from foretell two kinds of current even light schemes, the utility model discloses a defect of two kinds of current prior art schemes can be solved simultaneously to the scheme, provides bigger design space for further improving illumination visual effect moreover.

The adopted scheme is as follows: an optical module for uniform illumination comprises a scattering plate, wherein the upper part and the lower part of the scattering plate are respectively an incident surface and an emergent surface; and comprises a light source module arranged at the oblique rear part of the incident plane; the light source module comprises an LED light-emitting element and a reflector, the extending range of the light-emitting angle of the LED light-emitting element is staggered with the incident surface, the reflector is arranged on the light-emitting angle direction of the LED light-emitting element, and the reflector is arranged on the oblique rear side of the incident surface and faces the incident surface so as to uniformly reflect emergent light of the LED light-emitting element to the incident surface.

The utility model discloses a scheme makes light source and reflector all be in the oblique rear of the face of shining into, and the light-emitting radiation direction of LED light-emitting component light source avoids the direction of the face of shining into completely, and the light of having avoided the possible loss of LED light-emitting component can directly penetrate to the face of shining into on. In addition, the reflector is also positioned obliquely behind, and the light projected from the reflector has no chance of being positively incident on the incident surface at all.

Preferably, an included angle between a normal of a light-emitting surface of the LED light-emitting element and a plane where the incident surface is located is greater than 120 ° and less than 180 °;

the horizontal distance between the LED light-emitting element and the edge of the incident surface is d, and the vertical distance is H, so that d is more than 0.2H and less than H.

Preferably, the reflector has an arc-shaped reflecting surface, and the starting end of the arc-shaped reflecting surface extends downward from the upper side of the light-emitting surface of the LED light-emitting element in a parabola shape, and the parabola shape takes the normal of the light-emitting surface of the LED light-emitting element as a horizontal axis and the vertical line of the normal as a vertical axis.

Preferably, the normal of the light emitting surface of the LED light emitting element is taken as the optical axis, the outgoing light ray at the far angle above the normal is projected to the near end of the incident surface close to the light source module by the reflector, and the outgoing light ray is gradually projected to the far end of the incident surface from the near end of the incident surface by the reflector in the process that the angle between the outgoing light ray and the normal is smaller and gradually transited to the far angle below the normal.

Preferably, the width of the far end and the near end of the incident surface is L, and H is less than 0.5L.

Preferably, the LED light-emitting elements are arranged on a substrate extending along the parallel direction of the edge of the incident surface, and the LED light-emitting elements are regularly arranged on the substrate to form strip-shaped lamps;

the starting end of the reflector is fixed on the substrate, and the arc-shaped reflecting surface extends along the substrate to form a strip-shaped reflecting wall.

Preferably, the strip-shaped lamp and the strip-shaped reflecting wall include a plurality of segment rows spliced/detached to each other in the extending direction.

Preferably, the number of the light source modules is 2, and the light source modules are respectively symmetrically arranged at the opposite oblique rear parts of the two sides of the incident surface;

the vertical distance between the LED light-emitting element and the edge of the incident surface is H, the width of two sides of the incident surface is L, and H is less than 0.4L.

The second purpose of the utility model is to design an illumination lamps and lanterns of using above-mentioned optical module, be different from the surface emitting lamps and lanterns of prior art, the utility model discloses a scheme luminousness is high and can not see bright pearl completely, and especially dark background makes the diffuser plate go out to shine the face and has had more one kind of profound illuminating effect.

The adopted scheme is as follows: the lighting lamp of the optical module for uniform lighting further comprises a closed shell, wherein the lower side of the shell is provided with an opening part and an inner dark cavity, the shape of the opening part is matched with that of the scattering plate; the scattering plate is arranged at the opening part, and the incident surface of the scattering plate faces to the internal dark cavity; the light source module is fixed inside the shell.

Preferably, the top surface and the peripheral side surface inside the housing are provided with black light-absorbing material layers.

In the scheme of the utility model, the light source and the emitter are arranged at the oblique rear part of the scattering plate, the light source and the reflector can not be seen from the forward direction of the irradiation surface of the scattering plate, thereby avoiding the occurrence of bright spots when the lamp beads or the reflector irradiates forward, all light rays irradiate onto the scattering plate from the peripheral side in an oblique way, and the light rays are projected by the reflector and can not be directly irradiated onto the irradiation surface of the scattering plate by the light source; the illumination uniformity and the light extraction efficiency are not output in the direct type or side type backlight illumination scheme. In addition, the side and rear oblique entering type light evening proposal and the design of the inner dark cavity ensure that the light emitting surface of the surface light emitting lamp has the effect of starry sky and profound background, and the effect of simulating the dark autumn oblique sun brake, the dark sky and no glare is generated.

Drawings

Fig. 1 is a schematic diagram of an optical path of the optical module of the present invention;

fig. 2 is a schematic structural relationship diagram of the optical module of the present invention;

FIG. 3 is a schematic side view of the light source module according to the present invention;

fig. 4 is a schematic structural diagram of a middle light source module according to the present invention;

FIG. 5 is a schematic view of a three-dimensional structure of a middle light source module according to the present invention

Fig. 6 is a schematic structural view of the dual light source module of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1 to 5, an optical module for uniform illumination according to the present embodiment includes a scattering plate 32, the upper and lower surfaces of the scattering plate 32 are an incident surface and an emergent surface, respectively, light is incident on the incident surface and enters the scattering plate, and scattering particles are disposed in the scattering plate for scattering the incident light, so as to form a scattering effect, and the light is uniformly emitted from the emergent surface. The diffusion plate is a prior art, and can adjust various diffusion means, such as shape, haze, color and the like, for example, a rayleigh diffusion plate.

A light source module is arranged obliquely behind the incident plane of the diffusion plate 32, and the light source module comprises an LED light-emitting element 33 and a reflector 31.

The extending range of the light-emitting angle of the LED light-emitting element 33 is staggered from the incident surface, the reflector 31 is arranged in the light-emitting angle direction of the LED light-emitting element 33, and the reflector 31 is arranged obliquely behind the incident surface and faces the incident surface, so that the light emitted from the LED light-emitting element 33 is uniformly reflected to the incident surface.

In this embodiment, the light source and the reflector are both located at the oblique rear of the incident surface, and the light-emitting radiation direction of the LED light-emitting element 33 completely avoids the direction of the incident surface, so as to prevent light that may be dissipated by the LED light-emitting element 33 from directly irradiating the incident surface. In addition, the reflector 31 is also located diagonally rearward, and the light projected from the reflector 31 has no chance of being incident on the incident surface at all.

As can be seen from fig. 2, the included angle between the direction in which the normal ox of the LED light-emitting element 33 is emitted and the direction in which the plane of the incident surface extends is a large obtuse angle a, where a =150 ° in this embodiment.

In addition, as shown in fig. 1, the led light emitting element 33 has a horizontal distance d from the edge of the incident surface and a vertical distance H, where 0.3H < d < 0.5H in this embodiment. The width of the far end and the near end of the illuminated surface is L, and H =0.4L is taken.

As shown in fig. 5, the LED light emitting elements 33 are disposed on a strip-shaped substrate 21, and the LED light emitting elements 33 are linearly arranged in the middle of the substrate 21 and are uniformly arranged along the substrate to form a strip-shaped lamp effect.

The reflector 31 includes a starting end 22 and a curved end, the starting end 22 is fixed on the substrate 21, the curved end is similar to a parabola shape, and one side of the curved end facing the LED light emitting element is an arc-shaped reflecting surface which extends along the substrate to form a strip-shaped reflecting wall, as shown in fig. 5.

As shown in fig. 4, the shape of the cross-sectional curve of the reflector 31 is a shape similar to a half-parabola, the normal ox of the light emitting surface of the LED light emitting element is taken as the horizontal axis ox, the vertical line oy (passing through the LED light emitting element) of the normal is taken as the vertical axis oy, the initial end of the cross-sectional curve extends from the vertical axis along a trajectory similar to a parabola, the terminal end of the cross-sectional curve extends over the right lower side of the LED light emitting element 33, the terminal end of the cross-sectional curve forms an angle of more than 60 ° with the normal with the light source connecting line, as shown in fig. 3, in this embodiment, 65.57 ° is selected, and the light source position is located near the focus of the parabola.

As shown in fig. 1, the reflector 31 reflects the light emitted from the LED light-emitting element 33 with the maximum negative direction angle of-90 degrees to the edge of the incident surface of the diffuser plate 32 closest to the lamp bead, and the light rays with gradually increasing angles from-90 degrees are reflected to farther positions in sequence, and the light rays with the maximum positive direction angle are distributed to the farthest incident edge from the lamp bead. With the normal as the optical axis, the light above the optical axis is defined as the negative exit angle, and the light below the optical axis is defined as the positive exit angle.

The strip-shaped lamp and the strip-shaped reflecting wall comprise a plurality of linear splicing section rows 311,312, \8230, and the strip-shaped lamp and the strip-shaped reflecting wall can be disassembled and assembled to be favorable for modular assembly as shown in figure 5, and the length can be randomly adjusted according to the splicing number.

In the embodiment, the light source and the emitter are arranged at the oblique rear part of the scattering plate, the light source and the reflector cannot be seen from the front direction of the irradiation surface of the scattering plate, so that the bright spots generated when the lamp beads or the reflector irradiates in the front direction are avoided, all light rays irradiate onto the scattering plate from the peripheral side in an oblique manner, and the light rays are projected by the reflector and cannot be directly irradiated onto the irradiation surface of the scattering plate by the light source; the illumination uniformity and the light extraction efficiency are not output in the direct type or side type backlight illumination scheme.

Example two:

as shown in fig. 6, which is another optical module structure for uniform illumination in this embodiment, on the basis of embodiment 1, 2

light source modules

51 and 52 are set, and are respectively symmetrically disposed at the oblique rear sides of both sides of the incident surface of the diffusion plate 53; and the vertical distance between the LED light-emitting element and the edge of the incident surface is H, and the width of the two sides of the incident surface is L, wherein H is less than 0.4L. Compared with embodiment 1, the present embodiment has the further advantage that the light can be irradiated to the incident surface from two sides, so that the incident surface is more uniform, and the heights of the light source module and the incident surface can be reduced.

Example three:

the embodiment is further improved on the basis of the above embodiment, and designs an illuminating lamp for uniform illumination, which comprises a closed shell, wherein the lower side of the shell is provided with a mouth part with a shape matched with that of a scattering plate, and the scattering plate is arranged at the mouth part, so that the scattering plate and the mouth part are installed and fixed in a seamless manner; the shell also comprises an internal dark cavity, and the incident surface of the scattering plate faces the internal dark cavity; the light source module is fixed inside the shell, and in addition, the top surface and the peripheral side surface inside the shell are provided with black light absorption material layers such as black cotton wool layers and other existing materials. The lighting lamp adopts a side-rear oblique entering type light evening scheme, and an internal dark cavity design is added, so that a light emitting surface (a scattering plate) of the lighting lamp has the effect of starry sky and profound background, and the effect of simulating dark sky and dazzling-free sky in late autumn and oblique sun and brake sky and in dark sky is realized.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. In addition, although specific terms are used in the specification, the terms are used for convenience of description and do not limit the utility model in any way.

Claims

1. An optical module for uniform illumination comprises a scattering plate, wherein the upper part and the lower part of the scattering plate are respectively an incident surface and an emergent surface; and comprises a light source module arranged at the oblique rear part of the incident plane; the LED light source module is characterized by comprising an LED light-emitting element and a reflector, wherein the extending range of the light-emitting angle of the LED light-emitting element is staggered with the incident surface, the reflector is arranged in the light-emitting angle direction of the LED light-emitting element, and the reflector is arranged at the oblique rear of the incident surface and faces the incident surface so as to uniformly reflect the emergent light of the LED light-emitting element to the incident surface.

2. The optical module of claim 1, wherein an angle between a normal of a light emitting surface of the LED lighting element and a plane of the incident surface is greater than 120 ° and less than 180 °;

3. The optical module as claimed in claim 1 or 2, wherein the reflector has an arc-shaped reflecting surface, and the start of the arc-shaped reflecting surface extends downward from the upper side of the light-emitting surface of the LED light-emitting element in a parabolic shape, and the parabolic shape takes the normal of the light-emitting surface of the LED light-emitting element as a horizontal axis and the vertical line of the normal as a vertical axis.

4. The optical module as claimed in claim 3, wherein a normal line of the light emitting surface of the LED light emitting element is taken as an optical axis, the outgoing light beam at a far angle above the normal line is projected by the reflector to a near end of the incident surface close to the light source module, and the outgoing light beam is gradually projected by the reflector from the near end of the incident surface to a far end of the incident surface as an angle between the outgoing light beam and the normal line becomes smaller and gradually transitions to a far angle below the normal line.

5. The optical module of claim 4 wherein the distal and proximal ends of the illuminated surface have a width L, and H < 0.5L.

6. The optical module of claim 1, wherein the plurality of LED lighting elements are disposed on a substrate extending in a direction parallel to the edge of the incident surface, and are regularly disposed on the substrate to form a strip-shaped light;

7. The optical module of claim 6, wherein the strip-shaped lamps and the strip-shaped reflecting walls comprise a plurality of segment rows spliced/disassembled with each other along the extending direction.

8. The optical module of claim 1, wherein the number of the light source modules is 2, and the light source modules are symmetrically arranged at opposite oblique rear sides of the incident surface;

9. An illumination fixture with an optical module for uniform illumination according to any one of claims 1 to 8, wherein the illumination fixture comprises a closed housing having a mouth portion at the underside thereof shaped to fit the diffuser plate, and an internal dark chamber; the scattering plate is arranged at the opening part, and the incident surface of the scattering plate faces to the internal dark cavity; the light source module is fixed inside the shell.

10. A light fixture as recited in claim 9, wherein the top surface and the peripheral side surface of the interior of said housing are provided with a black light absorbing material layer.