CN111256092B - Anisotropic grid and anisotropic grid lamp - Google Patents

Anisotropic grid and anisotropic grid lamp Download PDF

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Publication number
CN111256092B
CN111256092B CN202010060315.0A CN202010060315A CN111256092B CN 111256092 B CN111256092 B CN 111256092B CN 202010060315 A CN202010060315 A CN 202010060315A CN 111256092 B CN111256092 B CN 111256092B
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point
grating
reflecting surface
light
lamp
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CN111256092A (en
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龚向阳
张宇
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Hangzhou Yuzhong Gaohong Lighting Electrical
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Hangzhou Yuzhong Gaohong Lighting Electrical
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/10—Construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/06—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using crossed laminae or strips, e.g. grid-shaped louvers; using lattices or honeycombs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/09—Optical design with a combination of different curvatures

Abstract

The invention relates to an anisotropic grating and an anisotropic grating lamp, wherein the anisotropic grating comprises a grid type grating plate formed by vertically and crossly arranging a plurality of grating strips, the grating strips comprise a near light source reflecting surface and a far light source reflecting surface along the vertical direction, the curvatures of each point of the near light source reflecting surface and the far light source reflecting surface are different according to different sight line directions of a visual task, and a free curved surface based on the visual task is formed. According to the invention, the height of the grating is not required to be increased, the light rays reflected by the grating are all emitted to the ground, and the anti-glare effect of the lamp is good.

Description

Anisotropic grid and anisotropic grid lamp
Technical Field
The invention relates to the technical field of illumination, in particular to an anisotropic grating and an anisotropic grating lamp.
Background
At present, fluorescent tubes, LED lamp tubes or common grille lamps which are not subjected to anti-glare treatment are widely applied in large-scale lighting environments such as schools, office buildings, office areas, markets, supermarkets and the like, and are particularly applied to teaching occasions.
The four surfaces of the traditional anti-glare grid are all planes vertical to the light emitting surface of the lamp, so that the light can be prevented from directly entering human eyes, and the light emitting efficiency of the lamp is influenced only by increasing the height of the grid. Patent No. ZL201720960082.3 discloses an anti-glare grid assembly, which is to configure different light incident surfaces by setting the cross sections of grid bars into different shapes, to form different incident angles, to redistribute the light emitted from the light source, so as to achieve the purpose of preventing glare. The grid assembly does not consider the visual line direction of the visual task, part of light rays reflected by the grid can be emitted to the direction of eyes, and the anti-glare effect is limited.
Disclosure of Invention
The invention aims to solve the technical problem of providing an anisotropic grating and an anisotropic grating lamp, wherein the height of the grating is not required to be increased, light rays reflected by the grating are all emitted to the ground, and the lamp has a good anti-glare effect.
In order to solve the above technical problems, the anisotropic grating provided by the present invention includes a lattice-type grating plate formed by vertically and crosswise arranging a plurality of grating strips, wherein the grating strips include a near light source reflection surface and a far light source reflection surface along a vertical direction, and curvatures of each point of the near light source reflection surface and the far light source reflection surface are different according to different visual line directions of a visual task, so as to form a free curved surface based on the visual task.
Further, the design of the free-form surface comprises the following steps:
(1) modeling a lamp: measuring a light distribution curve of the lamp by using a distribution photometer;
(2) scene modeling: modeling a scene of the lamp application, and dividing a lighting area (ground) into a plurality of equal parts according to a lighting target to be achieved;
(3) establishing a mapping relation: light rays emitted by the lamp are reflected to an illuminated surface (ground) through the grating, a corresponding relation is established between the point of the illuminated surface (ground) and each point of the reflecting surface on the grating, a normal vector of the corresponding point of the reflecting surface on the grating corresponding to each illumination area is calculated, and the coordinate of each discrete point is determined;
(4) surface fitting: and dividing the unit light-emitting unit into a plurality of equal parts corresponding to the illumination area, and Fresnel-forming the free curved surface consisting of the discrete points of the reflecting surface corresponding to each equal part.
Further, the process of establishing the mapping relationship is as follows:
let the direction vector I of the incident light be incident on the p point of the free-form surface, the direction vector of the reflected light after being reflected by the incident light is O, and falls on the illuminated surface, I, O and the p-point normal vector N satisfy the reflection law:
[2-2(O·I)]1/2N＝O–nI；
a) calculating the normal vector N of the initial pointp1: according to the lighting scene, the intersection point position of the reflecting surface and the luminous surface is taken as an initial point p of calculation1Point, modeling the light source according to the light distribution curve of the light source, and obtaining the unit direction vector of the discrete ray at the initial point emitted by the light source, namely the direction vector I of the incident rayp1Then establishing coordinates for the illumination areaObtaining the coordinates of the illumination area, and then corresponding the reflected light rays to the points of the illumination area one by one, namely obtaining the direction vector O of the reflected light raysp1According to the formula, the normal vector N of the free-form surface at the initial point is obtained at the set initial pointp1；
b) Determining the coordinates of each discrete point on the free-form surface: normal vector N from the initial pointp1Determining a tangent plane to the initial point, determining a second point p by intersecting the tangent plane with the incident ray at the second point2Normal vector N ofP2According to the method, the tangent plane of the previous point is intersected with the straight line where the incident ray of the next point is located to obtain the next point; and (3) obtaining coordinates of all points on the reflecting surface by using Matlab software and adopting an iteration method, and determining the coordinates of each discrete point on the free-form surface to form point cloud.
Further, the process of surface fitting is as follows:
and storing the obtained point cloud into a text document format, importing the point cloud into Rhino software, deleting irregular points to obtain regular curved surface point cloud, importing the processed point cloud into Imageware software for processing, extracting scanning lines through the point cloud, and obtaining a free curved surface by using the scanning lines.
An anisotropic grid light fixture is provided with the anisotropic grid.
The invention has the following beneficial effects: the grid bars are divided into the near light source reflecting surface and the far light source reflecting surface along the vertical direction, the curvatures of each point of the near light source reflecting surface and the far light source reflecting surface are different according to different visual line directions of a visual task, a free curved surface based on the visual task is formed, the obtained near light source reflecting surface and the far light source reflecting surface are of asymmetric free curved surface structures, the light intensity value of one side facing a user is weakened, the reflected light rays are emitted to the ground, the glare of the lamp is reduced, the height of the grid can be obviously reduced, and the light emitting efficiency of the lamp is improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and embodiments.
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic cross-sectional view taken along a-a of fig. 1 according to the present invention.
Fig. 3 is a partial enlarged view of the present invention at B in fig. 2.
Fig. 4 is a graticule energy map of the light distribution of the lamp of the present invention.
FIG. 5 is a schematic diagram of the inventive scenario modeling.
FIG. 6 is a schematic representation of ray reflections for scene modeling according to the present invention.
FIG. 7 is a free-form surface near the surface of the blackboard lamp in accordance with the embodiment of the present invention.
FIG. 8 is a light trace diagram of a blackboard lamp according to an embodiment of the present invention.
FIG. 9 is a diagram showing a distribution of light intensity of a blackboard lamp according to an embodiment of the present invention.
Fig. 10 is a floor illuminance distribution diagram of a blackboard lamp according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1 to 3, an anisotropic grating includes a lattice-type grating plate 2 formed by vertically crossing a plurality of grating strips 1, the grating strips 1 include a low-beam source reflection surface 3 and a high-beam source reflection surface 4 in a vertical direction, and curvatures of each point of the low-beam source reflection surface 3 and the high-beam source reflection surface 4 are different according to a visual line direction of a visual task, so as to form a free-form surface based on the visual task. An anisotropic grid light fixture as described, said light fixture being fitted with said anisotropic grid.
The design of the free-form surface comprises the following steps:
(1) modeling a lamp: measuring a light distribution curve of the lamp by using a distribution photometer, and mapping by using longitude and latitude grid energy as shown in FIG. 4;
(2) scene modeling: the scene of the luminaire application is modeled and the lighting area 5 is divided into equal parts in connection with the lighting target to be achieved, as shown in fig. 5.
(3) Establishing a mapping relation: light rays emitted by the lamp are reflected to the illuminated surface through the grating, a corresponding relation is established between the point of the illuminated surface and each point of the reflecting surface on the grating, the normal vector of the corresponding point of the reflecting surface on the grating corresponding to each illumination area is calculated, and the coordinate of each discrete point is determined. The process is as follows:
assuming that a direction vector I of an incident light ray is incident on a point p on the surface of the free-form surface, a direction vector of a reflected light ray after being reflected by the point is O, and the reflected light ray falls on the illuminated surface X, I, O and a point p normal vector N satisfy a reflection law:
[2-2(O·I)]1/2N＝O–nI；
a) calculating the normal vector N of the initial pointp1: as shown in FIG. 6, the position of the intersection of the reflecting surface and the light emitting surface is set as the initial point p of calculation according to the illumination scene1Point, modeling the light source according to the light distribution curve of the light source, and obtaining the unit direction vector of the discrete ray at the initial point emitted by the light source, namely the direction vector I of the incident rayp1Then, coordinates are established for the illumination area to obtain the coordinates of the illumination area, and then the reflected light rays correspond to the points of the illumination area one to obtain a direction vector O of the reflected light raysp1According to the formula, the normal vector N of the free-form surface at the initial point is obtained at the set initial pointp1；
b) Determining the coordinates of each discrete point on the free-form surface: normal vector N from the initial pointp1Determining a tangent plane to the initial point, determining a second point p by intersecting the tangent plane with the incident ray at the second point2Normal vector N ofP2According to the method, the tangent plane of the previous point is intersected with the straight line where the incident ray of the next point is located to obtain the next point; and (3) obtaining coordinates of all points on the reflecting surface by using Matlab software and adopting an iteration method, and determining the coordinates of each discrete point on the free-form surface to form point cloud.
(4) Surface fitting: and dividing the unit light-emitting unit into a plurality of equal parts corresponding to the illumination area, and Fresnel-forming a free-form surface consisting of discrete points of the reflecting surface corresponding to each equal part to form the micro-optical array. The process is as follows:
and storing the obtained point cloud into a text document format, importing the point cloud into Rhino software, deleting irregular points to obtain regular curved surface point cloud, importing the processed point cloud into Imageware software for processing, extracting scanning lines through the point cloud, and obtaining a free curved surface by using the scanning lines.
The lamp provided with the anisotropic grating takes a blackboard lamp as an example, the blackboard lamp of the embodiment is a square LED panel lamp light with 40cm by 40cm, and the luminous flux is designed to be 1000lm, and the lambertian body light-emitting mode is designed. According to the size of a classroom and a lamp, taking a near-blackboard surface as an example, an anisotropic grating with the space between grating strips being 8cm is designed, namely, the height of a curved surface is 8mm, the angle of reflected light is controlled to be 20 degrees, the black light absorption of the surface of the grating is tightly attached to the position under a panel lamp. The free curve obtained according to the above method is shown in fig. 7.
The blackboard lamp is simulated in a Tracepro environment, 100000 lights are set in a 5m by 5m lighting area, and the panel lamp and the grid are arranged at the height of 3 m. The simulation results are shown in fig. 8-10, where fig. 8 is a ray tracing diagram, fig. 9 is a light intensity distribution diagram, and fig. 10 is a ground illuminance distribution diagram, where (a) is a simulation diagram without a grating, and (b) is a simulation diagram with a grating. As can be seen from the simulation result, after the anisotropic grating is additionally arranged, the reduction degree of the glare facing to the human face is more than 25%.
The above description is illustrative and not restrictive. Many modifications and variations of this invention can be recognized by those skilled in the art in light of the above teachings that will fall within the spirit and scope of this invention.

Claims (5)

1. An anisotropic grating comprises a grid type grating plate formed by vertically and crossly arranging a plurality of grating strips, and is characterized in that the grating strips comprise a low-beam source reflecting surface and a high-beam source reflecting surface along the vertical direction, the curvatures of each point of the low-beam source reflecting surface and the high-beam source reflecting surface are different according to different sight directions of visual tasks, and a free-form surface based on the visual tasks is formed.
2. The anisotropic grid of claim 1, wherein the design of the free-form surface comprises the steps of:
(1) modeling a lamp: measuring a light distribution curve of the lamp by using a distribution photometer;
(2) scene modeling: modeling a scene applied by the lamp, and dividing an illumination area into a plurality of equal parts according to an illumination target to be achieved;
(3) establishing a mapping relation: reflecting light rays emitted by the lamp onto an illuminated surface through the grating, establishing a corresponding relation between the point of the illuminated surface and each point of the reflecting surface on the grating, calculating a normal vector of the corresponding point of the reflecting surface on the grating corresponding to each illumination area, and determining the coordinate of each discrete point;
(4) surface fitting: and dividing the unit light-emitting unit into a plurality of equal parts corresponding to the illumination area, and Fresnel-forming the free curved surface consisting of the discrete points of the reflecting surface corresponding to each equal part.
3. The anisotropic grid of claim 2, wherein the mapping relationship is established as follows:
let the direction vector I of the incident light be incident on the point p on the free-form surface, the direction vector of the reflected light after being reflected by the point p is O, and falls on the illuminated surface, I, O and the point p normal vector N satisfy the reflection law:
[2-2(O·I)]1/2N＝O–nI；
a) calculating the normal vector N of the initial pointp1: according to the lighting scene, the intersection point position of the reflecting surface and the luminous surface is taken as an initial point p of calculation1Point, modeling the light source according to the light distribution curve of the light source, and obtaining the unit direction vector of the discrete ray at the initial point emitted by the light source, namely the direction vector I of the incident rayp1Then, coordinates are established for the illumination area to obtain the coordinates of the illumination area, and then the reflected light rays correspond to the points of the illumination area one to obtain a direction vector O of the reflected light raysp1According to the formula, the normal vector N of the free-form surface at the initial point is obtained at the set initial pointp1；
b) Determining the coordinates of each discrete point on the free-form surface: normal vector N from the initial pointp1Determining a tangent plane to the initial point, from the tangent plane to the second point p2So as to determine a normal vector N of the second pointP2According to the method, the next point can be obtained by intersecting the tangent plane of the previous point with the straight line where the incident ray of the next point is located; and (3) obtaining coordinates of all points on the reflecting surface by using Matlab software and adopting an iteration method, and determining the coordinates of each discrete point on the free-form surface to form point cloud.
4. The anisotropic grid of claim 3, wherein the surface fitting is performed as follows:
and storing the obtained point cloud into a text document format, importing the point cloud into Rhino software, deleting irregular points to obtain regular curved surface point cloud, importing the processed point cloud into Imageware software for processing, extracting scanning lines through the point cloud, and obtaining a free curved surface by using the scanning lines.
5. The anisotropic grid light fixture of claim 1, wherein the light fixture is mounted with the anisotropic grid.
CN202010060315.0A 2020-01-19 2020-01-19 Anisotropic grid and anisotropic grid lamp Active CN111256092B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1410702A (en) * 2001-10-05 2003-04-16 市光工业株式会社 Headlamp
CN201203016Y (en) * 2008-06-02 2009-03-04 史杰 LED tunnel lamp
CN102330948A (en) * 2011-08-31 2012-01-25 华南理工大学 Reflector and combined headlamp for LED automobile illumination
CN103062709A (en) * 2011-10-19 2013-04-24 通用电气照明解决方案有限责任公司 Reflector and lighting device and purposes thereof
CN207162431U (en) * 2017-08-02 2018-03-30 漳州立达信光电子科技有限公司 Anti-dazzle grid component and anti-dazzle grid lampshade

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4068319B2 (en) * 2001-09-19 2008-03-26 株式会社小糸製作所 Reflective surface design method for vehicle lamp reflector
JP2011507051A (en) * 2007-12-18 2011-03-03 ライト プレスクリプションズ イノベーターズ エルエルシー Free-form concentrator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1410702A (en) * 2001-10-05 2003-04-16 市光工业株式会社 Headlamp
CN201203016Y (en) * 2008-06-02 2009-03-04 史杰 LED tunnel lamp
CN102330948A (en) * 2011-08-31 2012-01-25 华南理工大学 Reflector and combined headlamp for LED automobile illumination
CN103062709A (en) * 2011-10-19 2013-04-24 通用电气照明解决方案有限责任公司 Reflector and lighting device and purposes thereof
CN207162431U (en) * 2017-08-02 2018-03-30 漳州立达信光电子科技有限公司 Anti-dazzle grid component and anti-dazzle grid lampshade

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