CN213983423U

CN213983423U - Lens and LED module for realizing uniform rectangular illumination distribution of LED

Info

Publication number: CN213983423U
Application number: CN202120074115.0U
Authority: CN
Inventors: 贾燕; 马玉园
Original assignee: Jiangsu Zhongkeguanwei Automation Technology Co ltd
Current assignee: Jiangsu Zhongkeguanwei Automation Technology Co ltd
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2021-08-17
Anticipated expiration: 2031-01-12

Abstract

The utility model relates to a realize lens and LED module of even rectangle illuminance distribution of LED, the lens is 1/4 symmetrical structure, and the lens includes play plain noodles and income plain noodles, goes out plain noodles and income plain noodles and is the free curved surface of symmetrical solid of revolution, and the income plain noodles is the free curved surface that the indent formed on the installation face; the cross section of the light outgoing surface is in a round-corner rectangular shape, and the cross section of the light incoming surface is in a circular shape. The utility model is suitable for an area array light source of machine vision trade can form even rectangle facula with the whole LED light source.

Description

Lens and LED module for realizing uniform rectangular illumination distribution of LED

Technical Field

The utility model belongs to the technical field of the LED lens, concretely relates to realize lens and LED module of even rectangle illuminance distribution of LED.

Background

The LED light source has attracted wide attention from countries in the world due to its advantages of small size, light weight, long life, low energy consumption, etc., and it is a great trend that the LED light source replaces the traditional light source. However, since the spatial light intensity is approximately lambertian, the illumination intensity formed on the illuminated surface is rapidly attenuated along with the increase of the exit angle, and the practical requirement of large-range illumination is difficult to meet. Therefore, in LED lighting applications, secondary optical design is required to be performed according to the characteristics of LEDs, so that the light intensity distribution of the LEDs meets the light distribution requirement of large-area lighting.

The chinese utility model patent of application No. CN201420844158.2, title "a rectangle facula LED lens of even mixed light" discloses a rectangle facula LED lens of realizing even mixed light, and this lens includes the lens cup and sets up in the mirror surface of lens cup one side, has arranged a plurality of rectangle cylindrical mirror on the mirror surface, cylindrical mirror micro-structure array promptly. The lens cup body is provided with a groove body for placing the LED lamp beads. The lens cup has a light-gathering effect, light rays are refracted or reflected to the cylindrical mirror structure array through the cup, and light spots passing through the cylindrical mirror can be distributed in a rectangular shape. The method has the advantages that the cost of the lens is high in the processing process, the size of the cylindrical lens is small, the required processing precision is high, the cost is high, the installation precision of the lens is high in the installation process, and the shape of a light spot is affected if the installation angle or the position is not correct.

For shaping of a machine vision light source, in order to mix light more uniformly, the reflection cup lens mainly used in the market can be added with scales on the side surface of the reflection cup, or the light-emitting surface of the reflection cup is designed into a bead surface. However, the design finally presents a circular light spot, rather than a rectangular light spot, which results in energy waste when the receiving surface is rectangular, and the uniformity of the light spot is poor. When the receiving surface is rectangular, as shown in fig. 1, there is a large waste if a circular spot is used, which is not favorable for improving the energy efficiency.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a realize lens and LED module of the even rectangle illuminance distribution of LED, be applicable to the area array light source of machine vision trade, can be with the even rectangle facula of LED light source integrated formation.

In order to solve the technical problem, the utility model discloses a technical scheme be: the lens for realizing uniform rectangular illumination distribution of the LED is of an 1/4 symmetrical structure and comprises a light emitting surface and a light entering surface, wherein the light emitting surface and the light entering surface are both free-form surfaces of a symmetrical revolving body, and the light entering surface is a free-form surface formed by inwards recessing on a mounting surface; the cross section of the light outgoing surface is in a round-corner rectangular shape, and the cross section of the light incoming surface is in a circular shape.

Further, the more the rectangle of the cross section of the light emitting surface is close to the round angle of the rectangle at the top of the lens, the larger the round angle is.

Furthermore, the round corner rectangle of the cross section of the light-emitting surface is a round corner rectangle or a round corner square.

Furthermore, the side length of the maximum cross section of the light-emitting surface is within the range of 10-15mm, and the maximum thickness of the lens is within the range of 7-10 mm.

Furthermore, at least one LED chip can be accommodated in a cavity formed by the concave light incident surface.

Furthermore, the diameter of each LED chip is 1-5 mm.

Furthermore, the edge of the light incident surface of the lens is a mounting surface, the mounting surface is a plane, and the thickness of the edge is 2-2.4 mm.

Further, the edge of the lens is circular or rectangular.

Further, the material of the lens can adopt PMMA or PC optical plastic.

The utility model also provides a LED module, the LED module has foretell lens that realizes the even rectangle illuminance distribution of LED.

The utility model has the advantages that specifically as follows:

the facula that the lens plastic goes out is the more even rectangle facula of a conform to the requirements, is applicable to the area array light source of machine vision trade.

Drawings

Fig. 1 is a schematic diagram comparing a rectangular light spot with a circular light spot.

Fig. 2 is a top view of the lens of the present invention.

Fig. 3 is a bottom view of the lens of the present invention.

Fig. 4 is a cut-away view of the lens of the present invention.

Fig. 5 is a schematic diagram of the energy correspondence between the light source and the target plane grid.

Fig. 6 is a diagram of the testing effect of the lens of the present invention.

Description of reference numerals: 100-lens, 101-light-emitting surface, 102-light-entering surface and 103-mounting surface.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are further described below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be embodied in other specific forms other than those described herein, and it will be apparent to those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the invention.

Fig. 2-4 are schematic structural diagrams of a preferred embodiment of the lens for realizing uniform rectangular illumination distribution of LEDs according to the present invention. The lens 100 is an 1/4 symmetrical structure and can be obtained by rotating a bus for 360 degrees along a Z axis; the lens 100 comprises a light emitting surface 101 and a light entering surface 102, wherein the light emitting surface 101 is a free-form surface of a symmetrical revolving body, and the light entering surface is a free-form surface formed by recessing on a mounting surface 103 and is also a free-form surface of the symmetrical revolving body; the cross section of the light emitting surface 101 is in a rounded rectangle shape, the shape of each cross section is adjusted according to light distribution, and the round angle of the rectangle is larger closer to the top of the lens 100, so that the upper surface of the lens is more smooth, and the lens is convenient to process; the cross section of the light incident surface 102 is circular.

The light emitting angle of the LED chip is 180 degrees, the LED light source is divided according to the equal luminous flux of a spatial solid angle, the target plane, namely the receiving surface is divided according to the equal area, and the division number of the light source and the division number of the target plane are equal, as shown in FIG. 5. Each light flux is controlled to be incident on a corresponding mesh region on the target surface so that the equal-area regions obtain equal-area light fluxes, thereby generating a uniform illuminance distribution on the target surface. The light spot generated by the LED on the target surface is a rectangular light spot and is an 1/4 symmetrical structure, so the designed free-form surface is also a 1/4 symmetrical lens.

The rounded rectangle of the cross section of the light-emitting surface 101 is a rounded rectangle or a rounded square. In the embodiment, the side length of the maximum cross section of the light emitting surface 101 is within a range of 10-15mm, and the maximum thickness of the lens 100 is within a range of 7-10mm, wherein the maximum thickness refers to the thickness between the highest position of the top of the lens 100 and the mounting surface 103.

At least one LED chip can be accommodated in a cavity formed by the light incident surface 102 being concave inwards. In this embodiment, a single LED diameter of 1-5mm is used.

The edge of the light incident surface 102 of the lens 100 is a mounting surface 103, the mounting surface 103 is a plane, and the thickness of the edge is generally 2-2.4 mm. The edge of the lens 100 can be made into a circle, a rectangle or any other shape as required, and the shape of the edge does not affect the light spot.

The lens 100 may be made of optical plastic such as PMMA or PC, or may be made of any material with a known refractive index.

The design method of the lens for realizing the uniform rectangular illumination distribution of the LED is as follows: the light source is located at the origin O of the coordinate system, and the optical axis is coincident with the Z axis. Dividing the energy of the LED light source 1/4 into M × N parts according to solid angles, dividing the space into M parts along the weft direction, dividing the space into N parts along the warp direction, enclosing a certain area by any two adjacent warps and any two adjacent wefts, enclosing a solid angle by the area corresponding region and the sphere center, and reasonably controlling the size of the solid angles to enable the luminous fluxes in each solid angle to be equal. After the LED light source is divided according to the equal luminous flux, the coordinates of each division point can be known. Similarly, the target plane is also divided into M × N energy cells, and the coordinates of the bisector points on the target plane are calculated. The incidence of the light flux in each solid angle into the corresponding grid area of the target surface is controlled by designing the free-form surface lens. The design of the free lens is mainly programmed by MATLAB software and is realized by an iteration method. In this embodiment, since the lens is square-like, the four sides of the lens are equal to each other by adopting a design in which the division number M is equal to N.

As shown in fig. 6, in the present embodiment, the target plane is 750mm away from the lens, the lens distributes the energy of the light source more uniformly on the target plane of 750mm, the size of the light spot on the target plane is 1000 × 1000mm, wherein the uniformity of the illumination within the area of 700 × 700 is above 90%, a rectangular light spot with higher uniformity is generated, and the application is better in practice. As can be seen from fig. 6, the light spot shaped by the lens is a relatively uniform rectangular light spot.

The above detailed description is made on the lens for realizing uniform rectangular illumination distribution of the LED provided by the present application, and specific examples are applied herein to illustrate the principle and the implementation manner of the present application, and the description of the above embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. The utility model provides a realize lens of even rectangle illuminance distribution of LED which characterized in that: the lens (100) is of an 1/4 symmetrical structure, the lens (100) comprises a light emitting surface (101) and a light incident surface (102), the light emitting surface (101) and the light incident surface (102) are both free-form surfaces of a symmetrical revolving body, and the light incident surface (102) is a free-form surface formed by inwards recessing on the mounting surface (103); the cross section of the light emitting surface (101) is in a round-corner rectangular shape, and the cross section of the light incident surface (102) is in a circular shape.

2. The lens of claim 1 for achieving a uniform rectangular illuminance distribution on an LED, wherein: the more the rectangle of the cross section of the light emitting surface (101) is, the more the round angle of the rectangle is close to the top of the lens (100).

3. The lens of claim 1 for achieving a uniform rectangular illuminance distribution on an LED, wherein: the round corner rectangle of the cross section of the light emitting surface (101) is a round corner rectangle or a round corner square.

4. The lens of claim 1 for achieving a uniform rectangular illuminance distribution on an LED, wherein: the side length of the maximum cross section of the light emitting surface (101) is within the range of 10-15mm, and the maximum thickness of the lens (100) is within the range of 7-10 mm.

5. The lens of claim 1 for achieving a uniform rectangular illuminance distribution on an LED, wherein: at least one LED chip can be accommodated in a cavity formed by the concave light incident surface (102).

6. The lens of claim 5 for achieving a uniform rectangular illuminance distribution on an LED, wherein: the diameter of each LED chip is 1-5 mm.

7. The lens of claim 1 for achieving a uniform rectangular illuminance distribution on an LED, wherein: the edge of the light incident surface (102) of the lens (100) is a mounting surface (103), the mounting surface (103) is a plane, and the thickness of the edge is 2-2.4 mm.

8. The lens of claim 7 for achieving a uniform rectangular illuminance distribution on an LED, wherein: the edge of the lens (100) is circular or rectangular.

9. The lens of claim 1 for achieving a uniform rectangular illuminance distribution on an LED, wherein: the material of the lens (100) can adopt PMMA or PC optical plastic.

10. LED module, characterized in that it has a lens (100) according to one of claims 1 to 9 that achieves a uniform rectangular illuminance distribution of the LEDs.