当前位置:网站首页>[machine vision] detailed explanation of machine vision light source

[machine vision] detailed explanation of machine vision light source

2021-10-14 07:59:26 The sea smiles -dj

00. Catalog

01. Introduction to natural light

In the life , Light mainly comes from the sun , And the radiation of sunlight is also the most comprehensive , Although the sunlight looks colorless , But the composition of sunlight is the most complex , That is, sunlight is a compound light , Next, let's introduce the composition of sunlight ;

Sunlight is mainly divided into two parts : Invisible light , Visible light ;

Invisible light is mainly divided into Invisible light in infrared region and invisible light in ultraviolet region

The main wavelength of visible light is 760nm~380nm Light , This part of the light can be obtained by using prism dispersion to the sunlight ;
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In different visible light , Different wavelengths of light show different colors , That is, the wavelength determines the characteristics of a specific color ;

In everyday life , Sunlight / White light contains light in a variety of color bands , This white light can be decomposed through a prism , We can learn this in elementary physics ;

Machine vision light source mainly uses visible light 、 Part of the infrared light 、 Some ultraviolet light ;

02. Introduction to the color of light

Introduction to the color of light in machine vision

(1) White light : In machine vision, white light is divided into cold light 、 warm 、 Halftone color , It is usually better to use this kind of light source when taking color images , If there are special requirements for a part of the color image , You can do other related operations ;

(2) Blu ray : One of the three primary colors , It is more suitable for the lighting of the target under the silver background ;

(3) Red light : Both belong to one of the three primary colors , It can pass through some darker objects , Different methods such as color absorption can also be used , Achieve different lighting effects , Highlight the characteristics of the detected target , And the red light source can improve the contrast ;

(4) Green light : Mainly for red background 、 Silver background , And in 3C Application , Most conveyor belts are green ;

(5) Infrared light : It belongs to one of the invisible lights , Strong penetration , Good penetration into plastic , Internal components such as encapsulated metal circuits can be displayed , In this application scenario , Effect and X The rays are as good , And no harm to human body ;

(6) ultraviolet : It belongs to one of the invisible lights , Shorter wavelength , And strong penetration , It is mainly used for certificate detection , Touch screen ITO testing , Dispensing overflow detection , Metal surface scratch detection, etc ;

(7)X-ray laser : The wavelength is short , Good penetration , It can be used for perspective detection 、 Hub scratch and crack detection, etc ;

The three primary colors of visible light

The three primary colors of light include R 、G 、B ( red 、 green 、 blue ) Three colors of light , Light of different colors in life and industrial vision can be synthesized through the above three lights ;

as follows :

red + green = yellow

red + blue = green

red + green + blue = white

And red 、 green 、 None of the three colors of blue can be decomposed again , All colors can be formed by applying these three colors ;

The color addition law shown in the following example image :
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According to the color of light and the temperature of light , Different colors can form a color ring , As shown in the figure below , Adjacent colors are similar colors , Relative color is relative color ;
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The role of light source in machine vision system

  1. Enhanced features , Weaken the background
  2. Highlight measurement features
  3. Improve image information
  4. Simplify the algorithm
  5. Reduce the complexity of system design
  6. Improve the inspection accuracy of the system 、 Speed

03. Machine vision light source

3.1 Ring light source

Machine vision light source industrial lighting detection LED Light source ring light source
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Product description

The ring light source is made of highly flexible substrate , Unique manufacturing method , Can bend at any angle , In order to form a structure with the best outer diameter 、 Lighting system with inner diameter and illumination angle .

Product features

  • Various angles and customizable

  • Simple installation , Compact design

  • high-density LED array , High brightness

  • Optional diffuser plate , To adapt to different needs
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Product applications

◆ PCB Substrate detection 、 Plastic container testing

◆ Electronic component testing 、 IC character check

◆ Microscope illumination 、 General appearance inspection

◆ Liquid crystal correction

3.2 Strip light source ( Conventional type )

Machine vision light source strip light source LED Industrial lighting detection light source
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Product description

Aluminum alloy integrated design , High product accuracy , Good consistency ; It has good heat dissipation effect , And there are a variety of flexible installation methods , Easy to install and use .

Product features

◆ Flexible size design

◆ The irradiation angle can be adjusted freely according to the detection requirements .

◆ The color can be matched according to the detection requirements , Free combination .

◆ Optional diffuser plate , Spread the light evenly
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Product applications

■ LCD character , Location marks

■ Damage detection of expanded adhesive or extended film

■ Connector pin flatness detection

■ Liquid crystal element detection

3.3 Strip light source ( Nonstandard type )

Machine vision light source Strip light source Industrial lighting detection light source

Product description

Aluminum alloy integrated design , High product accuracy , Good consistency ; It has good heat dissipation effect , And there are a variety of flexible installation methods , Easy to install and use .
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Product features

◆ Flexible size design

◆ The irradiation angle can be adjusted freely according to the detection requirements .

◆ The color can be matched according to the detection requirements , Free combination .

◆ Optional diffuser plate , Spread the light evenly

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Product applications

■ LCD character , Location marks

■ Damage detection of expanded adhesive or extended film

■ Connector pin flatness detection

■ Liquid crystal element detection

3.4 Strip combined light source

Machine vision light source Adjustable on all sides Strip combined light source Industrial lighting detection light source

Product description

The strip combined light source is composed of a plurality of strip lights , The angle of each strip light can be adjusted freely , Achieve different effects .
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Product features

● Four sided combined bar light , Each side of the lighting can be controlled independently

● The required lighting angle can be adjusted according to the requirements of the measured object

● It's very versatile .
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Product applications

> Solder inspection

> Exterior and crack detection of ceramic packages

> Electronic component testing

> Metal plate surface inspection

> The package is damaged 、 Label detection

3.5 Highlight a high average bar light

Machine vision highlight high average strip light source industry LED Lighting source CCD Camera light source

Product description

Aluminum alloy integrated design , High product accuracy , Good consistency ; It has good heat dissipation effect , And there are a variety of flexible installation methods , Easy to install and use .
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Product features

◆ Flexible size design

◆ The irradiation angle can be adjusted freely according to the detection requirements .

◆ The color can be matched according to the detection requirements , Free combination .

◆ Optional diffuser plate , Spread the light evenly
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Product applications

■ LCD character , Location marks

■ Damage detection of expanded adhesive or extended film

■ Connector pin flatness detection

■ Liquid crystal element detection

3.6 Surface light source ( Backlight )

Product description

Surface light source ,LED After optical optimization design , Evenly distributed at the bottom of the light source , After passing through a special diffusion material, a uniform irradiation light is formed on its surface .
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Product features

● Better uniformity

● The light is soft and natural , High brightness

● Customizable multi-color backlight , Suitable for special occasions

● high-density LED Distributed at the bottom of the light source
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Product applications

◆ Dimensional measurement of mechanical parts

◆ electronic component 、IC Shape inspection of the

◆ Film stain detection

◆ Scratch detection of transparent objects

3.7 Parallel plane light source

Machine vision light source parallel plane light source backlight industry LED Lighting detection light source

Product description

Parallel plane light source ,LED After optical optimization design , Evenly distributed at the bottom of the light source , After passing through a special diffusion material, a uniform irradiation light is formed on its surface .

Product features

● Better uniformity

● The light is soft and natural , High brightness

● Customizable multi-color backlight , Suitable for special occasions

● high-density LED Distributed at the bottom of the light source
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Product applications

◆ Dimensional measurement of mechanical parts

◆ electronic component 、IC Shape inspection of the

◆ Film stain detection

◆ Scratch detection of transparent objects

3.8 Perforated surface light source

Machine vision light source, surface light source, backlight, industrial lighting detection light source

Product description

The backlight is a flat light source , from LED The array is distributed at the bottom of the light source , Optimized and designed into a loop or ring structure , The emitted light forms a uniform backlight after passing through a special light guide plate , It is usually used to measure only the contour of four sides or detect special products .

Product features

◆ high-density LED Distributed at the bottom of the light source

◆ Good uniformity , High brightness

◆ Various sizes can be customized , Suitable for special occasions

◆ Flexible sizes , Wide range of application
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Product applications

◆ Measure the overall dimension of four sides

◆ Edge breakage detection

◆ Transparent object impurity detection

◆ Oral liquid level height detection

◆ Screw defect detection

3.9 Side track backlight

Machine vision light source, side light guide backlight, industrial lighting detection light source

Product description

The size can be customized , Large area lighting can be achieved , Ultra thin high uniform backlight with thin thickness , Easy to install , Free customization from small format to large format , Multiple scattering luminescence Good local and overall uniformity .
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Product features

◆ Unique light guide material , Multiple scattering luminescence

◆ It can reduce the directivity of light , Become uniform light

◆ Ultra thin design , It saves a lot of space

◆ It can be customized according to color and luminous surface size
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Product applications

◆ Inspection of electrical components of large area circuit board

◆ Perspective dimension measurement

◆LED Bad spot detection

3.10 Coaxial light source

Machine vision light source coaxial light source industrial lighting detection LED The light source

Product description

Coaxial light source is mainly composed of high density LED And spectroscope .LED After emitting light through the spectroscope , Follow CCD On the same axis as the camera , It can effectively eliminate the ghosting of the image , It is suitable for the detection of scratches on the surface of smooth objects .

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Product features

  • high-density LED array , High brightness

  • It can effectively eliminate image ghosting

  • Uniform light

  • Suitable for a wide range of

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Product applications

  • Surface defect detection of reflective objects

  • QR code recognition

  • Object edge positioning

  • Silk screen positioning

  • Mark Point positioning

  • Chip character detection

  • Beverage bottle mouth detection

3.11 Right angle coaxial light source

Machine vision light source right angle coaxial light source industry LED Highlight lighting detection light source

Product description

The right angle coaxial light source is mainly composed of high density LED And spectroscope .LED After emitting light through the spectroscope , Follow CCD On the same axis as the camera , It can effectively eliminate the ghosting of the image , It is suitable for the detection of scratches on the surface of smooth objects .

Product features

  • high-density LED array , High brightness

  • It can effectively eliminate image ghosting

  • Uniform light

  • Suitable for a wide range of
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Product applications

》 Surface defect detection of reflective objects

》 QR code recognition

》 Object edge positioning

》 Silk screen positioning

》 Mark Point positioning

》 Chip character detection

》 Beverage bottle mouth detection

3.12 Highlight high average coaxial light source

Machine vision highlight high average coaxial light source industry LED The highlighted CCD Image detection light source

Product description

Coaxial light source is mainly composed of high density LED And spectroscope .LED After emitting light through the spectroscope , Follow CCD On the same axis as the camera , It can effectively eliminate the ghosting of the image , It is suitable for the detection of scratches on the surface of smooth objects .

Product features

  • high-density LED array , High brightness

  • It can effectively eliminate image ghosting

  • Uniform light

  • Suitable for a wide range of
     Insert picture description here

Product applications

》 Surface defect detection of reflective objects

》 QR code recognition

》 Object edge positioning

》 Silk screen positioning

》 Mark Point positioning

》 Chip character detection

》 Beverage bottle mouth detection

3.13 Coaxial parallel light source

Machine vision light source Coaxial parallel light source Automatic industrial lighting detection light source

Product description

Coaxial parallel light source , Special optical lens combination design , Make the light source realize parallel light irradiation . It can suppress the diffraction of light , Achieve high-precision imaging . When testing the product surface , It can clearly highlight the concave convex defects on the flat surface . For metals 、 glass 、 film 、 Scratch detection of flat surfaces such as wafers .

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Product features

● Highlight high power LED The lamp .

● It can effectively eliminate reflection .

● Uniform light .

● High parallelism .
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Product applications

◆ Appearance defect detection on reflective plane .

◆ Detect slight scratches on the surface of the mobile phone screen .

◆ Detect slight scratches on the surface of the charger .

◆ Detect slight bumps on the glass .

◆ Detect laser engraved characters .

◆ Detect the fine burr of the product contour .

3.14 Linear light source

Machine vision linear light source linear sweep light source industrial lighting detection line sweep light source

Product description

The linear light source is composed of high-power LED Array , Design special heat dissipation structure , A special circular lens is used to form a narrow band of light , Increase the brightness of the light , Used with linear array camera .
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Product features

◆ The light source can be customized according to customer needs ;

◆ Using high density LED The arrangement mode and high uniform diffuser structure can effectively eliminate the uneven problem of high reflective surface lighting ;

◆ Achieve high uniformity , It is suitable for all kinds of pipeline continuous detection occasions ;

◆ Use cylindrical lens to focus light , Super brightness .
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Product applications

◆ Fabric inspection ;

◆ Printed character detection ;

◆ Glass scratch detection ;

◆ Label stain 、 Character detection ;

◆ The surface of Apple phone shell is scratched , Stain detection ;

◆ Tea color sorting detection ;

◆ Steel plate inspection .

3.15 Dome light source

Machine vision light source sphere integral light source dome light source Dome light source industrial lighting source

Product description

Dome light source is a kind of light source with high uniformity , By high brightness patch LED The emitted light forms a uniform light after spherical diffuse reflection . Suitable for detecting surface reflection 、 Undulating objects .

Product features

◆ Spherical diffuse reflection luminescence

◆ Diffuse shadowless light source

◆ Suitable for surface undulation 、 Reflective objects

◆ High uniformity

◆ Shadowless effect is good
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Product applications

> Unevenness of concave convex surface 、 Reflective surface detection

> Metal 、 Surface detection of objects with strong reflection on glass surface

> Code spraying detection at the bottom of cans

> food 、 Drug appearance inspection

3.16 Tunnel light source

Machine vision arch light source tunnel light source dome light source special light source for printing detection

Product description

High brightness and high power are adopted LED, Through special Special heat dissipation design , High luminous intensity , Good uniformity , Suitable for non reflective object detection , It can be equipped with contract axis light Source combination detection PCB Plate features .
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Product features

◆ The light source can be customized according to customer needs

◆ At the same time, it has the characteristics of spherical integral and strip light , Achieve large format uniform illumination

◆ You can choose opening or slotting , Both array and linear array items are applicable

◆ The whole image can be irradiated with high uniformity

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Product applications

◆ Cigarette bag surface inspection

◆ Large format surface defect detection

◆ Line array bare board AOI

◆ Electronic product shell stain and impurity detection

04. appendix

4.1 Machine vision hardware selection —— Light source selection

Blog : Machine vision hardware selection —— Light source selection

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