CN210465949U - Machine vision light source device based on free-form surface and Fresnel surface - Google Patents
Machine vision light source device based on free-form surface and Fresnel surface Download PDFInfo
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- CN210465949U CN210465949U CN201921812747.1U CN201921812747U CN210465949U CN 210465949 U CN210465949 U CN 210465949U CN 201921812747 U CN201921812747 U CN 201921812747U CN 210465949 U CN210465949 U CN 210465949U
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Abstract
The utility model discloses a machine vision light source device based on free curved surface and fei nieer face, including radiator, LED light source, grading lens, protection apron and light source shell, the LED light source is fixed on the radiator, the dead ahead at LED light source light emitting area is installed along the direction of optical axis to grading lens, and the dead ahead of grading lens is equipped with the protection apron, grading lens and radiator are fixed inside the light source shell. The utility model discloses a machine vision light source device can obtain the output beam that the depth of parallelism is good to energy distribution is even, thereby is stronger to being detected object surface detail performance ability, and abundant outstanding detection surface three dimensional characteristic, and then promote and detect the precision, solves technical problem such as current light source emergent light energy distribution is inhomogeneous, the collimation is poor.
Description
Technical Field
The utility model belongs to the technical field of machine vision, more specifically relates to a machine vision light source device based on free curved surface and fei nieer face.
Background
The machine vision system adopts a camera to convert a detected object into an image signal, transmits the image signal to a special image processing system, analyzes information such as pixels, brightness, colors and the like, and extracts target characteristic information such as volume, color, direction and the like through a specific algorithm. In modern industrial production, machine vision technology is widely applied to application scenarios such as product detection, working condition analysis and quality monitoring.
The imaging quality level is greatly influenced by the characteristics of the light source such as brightness, uniformity and the like, and the high-quality machine vision light source has a great effect on improving the performance of a machine vision system. In particular, for defect inspection applications of planar targets, there are high requirements for uniformity and collimation of the light source. The existing machine vision light source can not meet the two requirements at the same time, namely, the uniformity and the collimation can not be met at the same time. Especially, the current machine vision light source generally adopts a plurality of LED lamp pearls to make up the range, though can realize the relatively even illuminating effect at closely, but this kind of machine vision light source can't guarantee the collimation nature of light-emitting on the one hand, and on the other hand uses a plurality of LED lamp pearls can lead to the increase of cost and volume.
Disclosure of Invention
To the above defect of prior art or improve the demand, the utility model provides a machine vision light source device based on free curved surface and fresnel surface can obtain the output beam that the depth of parallelism is good to energy distribution is even, thereby is stronger to being detected object surface detail performance ability, and fully outstanding is detected surperficial three-dimensional characteristic, and then promotes and detects the precision, solves technical problem such as current light source emergent light energy distribution inhomogeneous, collimation difference.
In order to realize the above-mentioned purpose, the utility model provides a machine vision light source device based on free curved surface and fei nieer face, including radiator, LED light source, grading lens, protection apron and light source shell, the LED light source is fixed on the radiator, the straight ahead in LED light source light emitting area is installed along the direction of optical axis to grading lens, and the straight ahead of grading lens is equipped with the protection apron, grading lens and radiator are fixed inside the light source shell.
Further, the light distribution lens is a Fresnel lens, the Fresnel lens comprises a plane and a Fresnel surface, and the plane is close to the LED light source.
Further, the Fresnel surface is composed of a series of concentric arc surfaces, and the concentric arc surfaces are free-form surfaces.
Further, the LED light source is a three-color LED.
Further, the LED light source, the light distribution lens and the protective cover plate are coaxially mounted.
Further, the protective cover plate is a planar lens.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
(1) the utility model discloses a machine vision light source device can obtain the output beam that the depth of parallelism is good to energy distribution is even, thereby is stronger to being detected object surface detail performance ability, and abundant outstanding detection surface three dimensional characteristic, and then promote and detect the precision, solves technical problem such as current light source emergent light energy distribution is inhomogeneous, the collimation is poor.
(2) The machine vision light source device of the utility model adopts the three-color LED as the light source, and can selectively output light beams with different colors and different powers through the working mode of the controller;
(3) the machine vision light source device of the utility model adopts the free-form surface and the Fresnel surface to simultaneously realize the control of the illumination distribution and the wavefront of the light emitted by the LED, and can realize the collimated and uniform illumination light;
(4) the machine vision light source device of the utility model adopts the sawtooth structure and the blacking treatment on the inner surface of the light source shell, which is beneficial to inhibiting the stray light and improving the quality of the output light beam;
(5) the machine vision light source device of the utility model can collect the light emitted by the LED in all directions, thereby improving the energy utilization efficiency; the hardware structure is simpler, and is stable stronger, compact structure, and the cost is lower, and practical wide range.
Drawings
Fig. 1 is an overall schematic diagram of a machine vision light source device based on a free-form surface and a fresnel surface according to an embodiment of the present invention;
FIG. 2 is a partial enlarged view of portion A of FIG. 1;
fig. 3 is the embodiment of the present invention discloses a light transmission diagram of a machine vision light source device based on a free-form surface and a fresnel surface.
Throughout the drawings, like reference numerals designate like structural elements, and wherein: 1-a radiator; 2-an LED light source; 3-a light distribution lens; 4-a light source housing; 5-a protective panel; 6-cylindrical surface type of the light distribution lens; 7-a free-form surface portion of the first light distribution lens; 8-a free-form surface portion of the second light distribution lens; 9-Fresnel surface of light distribution lens; 10-heat-conducting silicone grease.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 to 2, an embodiment of the present invention provides a machine vision light source device based on a free-form surface and a fresnel surface, which includes a heat sink 1, an LED light source 2, a light distribution lens 3, a light source housing 4, a protection panel 5, a cylindrical surface type 6 of the light distribution lens, a free-form surface portion 7 of a first light distribution lens, a free-form surface portion 8 of a second light distribution lens, and a fresnel surface 9 of the light distribution lens. The three-color LED light source 2 is fixed on the radiator 1 through heat-conducting silicone grease 10, the light distribution lens 3 is installed in front of the LED light-emitting surface along the direction of the optical axis, and the protective cover plate 5 is installed in front of the Fresnel surface 9 of the lens. The protective cover plate 5, the light distribution lens 3 and the heat sink 1 are fixed on the light source housing 4. By controlling the working mode of the three-color LED, the output of collimated and uniform light beams with different colors and power can be realized. The utility model discloses a machine vision light source device can obtain the output beam that the depth of parallelism is good to energy distribution is even, thereby is stronger to being detected object surface detail performance ability, and abundant outstanding detection surface three dimensional characteristic, and then promote and detect the precision, solves technical problem such as current light source emergent light energy distribution is inhomogeneous, the collimation is poor.
The light emitted by the LED light source 2 is first refracted and reflected by the free-form surface portion 7 of the first light distribution lens and the free-form surface portion 8 of the second light distribution lens, and when reaching the fresnel surface 9 of the light distribution lenses, a uniform illuminance distribution is formed, and the shape of the light spot is circular. The fresnel surface 9 of the light distribution lens is used to change the propagation direction of light entering obliquely from the free-form surface, i.e. to collimate the exiting light beam. The light emitted from the light source is sequentially controlled by the free-form surface part 7 of the first light distribution lens, the free-form surface part 8 of the second light distribution lens and the Fresnel surface 9 of the light distribution lens, and finally, parallel light beams with uniform energy distribution are output.
Further, referring to fig. 1, the light distribution lens 3 is composed of a cylindrical surface shape 6 of the light distribution lens, a free-form surface portion 7 of the first light distribution lens, a free-form surface portion 8 of the second light distribution lens, and a fresnel surface 9 of the light distribution lens. The light distribution lens 3 and the protective cover plate 5 are fixed on the light source shell 4 through buckles. The protective cover plate 5 can effectively prevent foreign matters such as dust and the like from entering the inner cavity of the light source, so that the lighting effect is not influenced, and the reliability of the device body is embodied.
Further, referring to fig. 1, the inside of the light source housing 4 is configured as a "saw-tooth" structure, and is blackened, so that stray light can be effectively suppressed, and uniformity and collimation of the output light beam can be improved. The utility model discloses a machine vision light source device, light source shell internal surface adopt the sawtooth structure and scribble black processing, are favorable to restraining stray light, improve the output beam quality.
Referring to fig. 2, the LED light source 2 is tightly combined with the heat sink 1 through the heat conductive silicone grease 10, so that the heat dissipation efficiency of the light source is effectively improved, meanwhile, the stability of the light source is increased, the power consumption is reduced, and the overall use cost of the light source is reduced.
Referring to fig. 3, the light of a small angle emitted by the LED light source 2 is refracted by the free-form surface portion 7 of the first light distribution lens, and then reaches the fresnel surface 9 of the light distribution lens; the light rays with large angles are firstly refracted by the cylindrical surface 6 of the light distribution lens and then reflected to the Fresnel surface 9 of the light distribution lens by the free-form surface part 8 of the second light distribution lens. The large-angle light and the small-angle light emitted by the light source jointly form uniform illuminance distribution on the fresnel surface 9 of the light distribution lens. The fresnel surface 9 of the light distribution lens adjusts the direction of the obliquely incident light to collimate and output the light, and the light intensity distribution is uniform. The utility model discloses a machine vision light source device adopts free curved surface and fresnel surface to realize simultaneously that the light that sends LED carries out the control of illuminance distribution and wavefront, can realize collimation and even illumination light.
As an example, the control of the generation of three different colored output lights is described below:
first, the red LEDs in the three-color LEDs are operated, and the other two LEDs are turned off, thereby enabling red light output.
Second, the red, green, and blue LEDs of the three-color LED are simultaneously operated, and white light output can be realized by controlling the operating current of each LED.
And thirdly, the red LED and the green LED in the three-color LED work simultaneously, the blue LED is turned off, and the working current of the red LED and the working current of the green LED are controlled to realize yellow light output.
The machine vision light source device of the utility model can collect the light emitted by the LED in all directions, thereby improving the energy utilization efficiency; the hardware structure is simpler, and is stable stronger, compact structure, and the cost is lower, and practical wide range.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (6)
1. The utility model provides a machine vision light source device based on free curved surface and fresnel surface, its characterized in that, includes radiator, LED light source, grading lens, protection apron and light source shell, the LED light source is fixed on the radiator, the dead ahead at LED light source light emitting area is installed along the direction of optical axis to grading lens, and the dead ahead of grading lens is equipped with the protection apron, grading lens and radiator are fixed inside the light source shell.
2. The machine vision light source device based on the free-form surface and the Fresnel surface as claimed in claim 1, wherein the light distribution lens is a Fresnel lens, the Fresnel lens comprises a plane and the Fresnel surface, and the plane is close to the LED light source.
3. The machine vision light source device based on the free-form surface and the Fresnel surface as claimed in claim 2, wherein the Fresnel surface is composed of a series of concentric arc surfaces, and the concentric arc surfaces are all free-form surfaces.
4. The machine vision light source device based on the free-form surface and the Fresnel surface as claimed in claim 3, wherein the LED light source is a three-color LED.
5. The machine vision light source device based on the free-form surface and the Fresnel surface as claimed in claim 3, wherein the LED light source, the light distribution lens and the protective cover plate are coaxially installed.
6. The machine vision light source device based on the free-form surface and the Fresnel surface as claimed in claim 3, wherein the protective cover plate is a planar lens.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921812747.1U CN210465949U (en) | 2019-10-27 | 2019-10-27 | Machine vision light source device based on free-form surface and Fresnel surface |
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| CN201921812747.1U CN210465949U (en) | 2019-10-27 | 2019-10-27 | Machine vision light source device based on free-form surface and Fresnel surface |
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| CN210465949U true CN210465949U (en) | 2020-05-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021141036A (en) * | 2020-03-02 | 2021-09-16 | 韓一電機株式会社 | Illumination lamp assembly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021141036A (en) * | 2020-03-02 | 2021-09-16 | 韓一電機株式会社 | Illumination lamp assembly |
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