CN107228859A - Optical system and automated optical detection equipment - Google Patents
Optical system and automated optical detection equipment Download PDFInfo
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- CN107228859A CN107228859A CN201710369972.1A CN201710369972A CN107228859A CN 107228859 A CN107228859 A CN 107228859A CN 201710369972 A CN201710369972 A CN 201710369972A CN 107228859 A CN107228859 A CN 107228859A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/956—Inspecting patterns on the surface of objects
- G01N21/95607—Inspecting patterns on the surface of objects using a comparative method
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
- G01N2021/8835—Adjustable illumination, e.g. software adjustable screen
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/956—Inspecting patterns on the surface of objects
- G01N21/95607—Inspecting patterns on the surface of objects using a comparative method
- G01N2021/95615—Inspecting patterns on the surface of objects using a comparative method with stored comparision signal
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/956—Inspecting patterns on the surface of objects
- G01N2021/95638—Inspecting patterns on the surface of objects for PCB's
- G01N2021/95646—Soldering
Abstract
The present invention relates to a kind of optical system and automated optical detection equipment, wherein, optical system includes light source.The automated optical detection equipment also includes video capturing device, and the video capturing device is used to board under test is scanned to obtain scan image.The optical system also includes brightness controlling device.The characteristic that the brightness controlling device is changed over time according to the light intensity of the light source, the light intensity of the light source is adjusted once every setting time section, the difference between initial set value to reduce actual light intensity and the light intensity that the board under test is exposed in detection process, changed so as to improve the light intensity of light source with the time and the problem of influence Detection results, improve the precision of detection.
Description
Technical field
The present invention relates to optical field, more particularly to a kind of optical system and automated optical detection equipment.
Background technology
AOI (Automatic Optic Inspection) full name is automatic optics inspection, be based on optical principle come
The equipment detected to the common deficiency run into welding production.Upon automatic detection, machine passes through camera automatically scanning
PCB (Printed Circuit Board, printed circuit board), gathers image, will be qualified in the solder joint and database of test
Parameter is compared, by image procossing, checks defect on PCB, and defect is shown/marked by display or Automatic Logos
Show to come, repaired for maintenance personal.
However, in test process, the light intensity of light source would generally change with the time, for example, decay with the time, so that
The quality of scan image is influenceed, and then influences Detection results.
The content of the invention
Based on this, it is necessary to which there is provided one for the problem of light intensity for light source changes with the time and influences Detection results
Plant optical system and automated optical detection equipment.
A kind of optical system, the optical system includes light source；The automated optical detection equipment also includes image capturing
Device, and the video capturing device to board under test for being scanned to obtain scan image；The optical system also includes
Brightness controlling device；The characteristic that the brightness controlling device is changed over time according to the light intensity of the light source, every setting time
Section adjusts once the light intensity of the light source, to reduce actual light intensity and the light intensity that the board under test is exposed in detection process
Initial set value between difference.
In one of the embodiments, the light intensity of the light source decays with the time.
In one of the embodiments, the spy that the brightness controlling device is decayed according to the light intensity of the light source with the time
Property, strengthen once the light intensity of the light source every setting time section.
In one of the embodiments, the brightness controlling device includes timer and optical modulator module；The timer
With optical modulator module electrical connection；
The timer provides real-time temporal information to the optical modulator module；The optical modulator module according to it is described when
Between the characteristic that changes over time of information and the light intensity of the light source recognize the current light intensity of the light source, and according to the identification
The light intensity of the light source is adjusted during fructufy, to reduce actual light intensity and the light that the board under test is exposed in detection process
Difference between strong initial set value.
In one of the embodiments, the optical modulator module includes electrooptic modulator and control unit；The electric light is adjusted
Device processed is electrically connected with described control unit；Also, described control unit is connected with the timer；
The electrooptic modulator is used to be modulated the light source；Described control unit is according to the temporal information and institute
State the characteristic that the light intensity of light source changes over time and recognize the current light intensity of the light source, and according to adjustment during the fructufy of identification plus
The voltage of the electrooptic modulator is loaded onto, to reduce actual light intensity and the light intensity that the board under test is exposed in detection process
Initial set value between difference.
A kind of automated optical detection equipment, including light source and video capturing device, the video capturing device are used to treat
Drafting board is scanned to obtain scan image；The automated optical detection equipment also includes brightness controlling device；The brightness control
The characteristic that device processed is changed over time according to the light intensity of the light source, the light of the light source is adjusted once every setting time section
By force, the difference between the initial set value to reduce actual light intensity and the light intensity that the board under test is exposed in detection process
Value.
In one of the embodiments, the light intensity of the light source decays with the time.
In one of the embodiments, the spy that the brightness controlling device is decayed according to the light intensity of the light source with the time
Property, strengthen once the light intensity of the light source every setting time section.
In one of the embodiments, the brightness controlling device includes timer and optical modulator module；The timer
With optical modulator module electrical connection；
The timer provides real-time temporal information to the optical modulator module；The optical modulator module according to it is described when
Between the characteristic that changes over time of information and the light intensity of the light source recognize the current light intensity of the light source, and according to the identification
The light intensity of the light source is adjusted during fructufy, to reduce actual light intensity and the light that the board under test is exposed in detection process
Difference between strong initial set value.
In one of the embodiments, the optical modulator module includes electrooptic modulator and control unit；The electric light is adjusted
Device processed and described control unit electrical connection；Also, described control unit is connected with the timer；
The electrooptic modulator is used to be modulated the light source；Described control unit is according to the temporal information and institute
State the characteristic that the light intensity of light source changes over time and recognize the current light intensity of the light source, and according to adjustment during the fructufy of identification plus
The voltage of the electrooptic modulator is loaded onto, to reduce actual light intensity and the light intensity that the board under test is exposed in detection process
Initial set value between difference.
Above-mentioned optical system and automated optical detection equipment have the advantage that for：In the optical system and automated optical
In detection device, the characteristic that brightness controlling device is changed over time according to the light intensity of light source, every the adjustment of setting time section once
The light intensity of light source, the difference between initial set value to reduce actual light intensity and light intensity that board under test is exposed in detection process
Value, changes and the problem of influence Detection results with the time so as to improve the light intensity of light source, improves the precision of detection.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
The accompanying drawing of other embodiment is obtained according to these accompanying drawings.
The composition schematic diagram for the automated optical detection equipment that Fig. 1 provides for an embodiment；
Fig. 2 for Fig. 1 illustrated embodiments automated optical detection equipment in by brightness controlling device to modulation of source its
A kind of middle curve synoptic diagram；
Fig. 3 for Fig. 1 illustrated embodiments automated optical detection equipment in optical system one of which embodiment frame
Figure；
Fig. 4 is the specific block diagram of one of which of the optical system of embodiment illustrated in fig. 3.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give presently preferred embodiments of the present invention.But, the present invention can be realized in many different forms, however it is not limited to this paper institutes
The embodiment of description.On the contrary, the purpose for providing these embodiments is to make the understanding to the disclosure more thorough
Comprehensively.
Unless otherwise defined, the skill of technical field of all of technologies and scientific terms used here by the article with belonging to invention
The implication that art personnel are generally understood that is identical.Herein description is intended merely in the term used in the description of invention specifically
The purpose of embodiment, it is not intended that the limitation present invention.Term as used herein "and/or" includes one or more related institutes
The arbitrary and all combination of list of items.
One embodiment provides a kind of optical system, applied in automated optical detection equipment, refer to Fig. 1.Automatically
Optical detection apparatus also include video capturing device 200, and video capturing device 200 be used for board under test 300 is scanned with
Obtain scan image.Wherein, board under test 300 is, for example, pcb board.Optical system is used to launch light to board under test 300.Image is obtained
Device 200 is taken to be scanned according to the light reflected from board under test 300 to board under test 300, so as to obtain scan image.Scanning figure
As being compared after treatment with standard picture, so as to detect the defect of board under test 300.
Specifically, video capturing device 200 is, for example, TDI-CCD (Time Delayed and Integration, time
Delay integration CCD), at this moment, the scan image that video capturing device 200 is obtained be gray-scale map, and the grey decision-making of the gray-scale map with
The light intensity of optical system transmitting is relevant.
Optical system includes light source 100 and brightness controlling device 400.Light source 100 can launch light, for example, metal halogen
Plain lamp.The characteristic that brightness controlling device 400 is changed over time according to the light intensity of light source 100 adjusts once light every setting time section
Between the light intensity in source 100, the initial set value to reduce actual light intensity and light intensity that board under test 300 is exposed in detection process
Difference.
Wherein, light intensity is light intensity.With light source 100 for for metal halid lamp, the light intensity of light source 100 is changed over time
Characteristic, i.e. the light intensity of light source 100 decays with the time, therefore the intensity of light that light source 100 is launched in use will
It is more and more lower.Every setting time section, it is light intensity persistently to light source 100 in detection process to refer to brightness controlling device 400
It is adjusted.Also, the different qualities being had according to different light sources 100, brightness controlling device 400 can be when identical
Between section adjustment once (i.e. setting time section for fixation value) light source 100 light intensity, or, brightness controlling device 400 can also
Every different period (i.e. setting time section for change value) adjustment primary source 100 light intensity.
The initial set value of light intensity, for example, recipe (the i.e. summation of all parameters of automatic optics inspection, during comprising detection
Used precision, light source, brightness, the size of detection zone, position etc.) light intensity value of light source 100 that initially sets up, and the value
It at least ensure that the brightness of scan image can be used for detecting board under test 300.Board under test 300 is exposed in reduction detection process
Actual light intensity and light intensity initial set value between difference, so as to reduce the brightness of the scan image in detection process
Influenceed by the change of the light intensity of light source 100.Specifically, brightness controlling device 400 can be changed over time according to the light intensity of light source 100
Characteristic, every the light intensity of setting time section adjustment primary source 100, to cause the actual light intensity for exposing to board under test 300 to exist
The initial set value of light intensity is equal in whole detection process, so as to ensure the brightness of scan image in whole detection process all
It will not be influenceed by the change of the light intensity of light source 100.
(the i.e. light intensity of light source 100 in addition, characteristic that brightness controlling device 400 is changed over time according to the light intensity of light source 100
Variation characteristic) every the light intensity of setting time section adjustment primary source 100, refer to that brightness controlling device 400 is used in light source 100
Having known characteristic that the light intensity of light source 100 changes over time in advance before, (such as brightness controlling device 400 is stored with light source
100 light intensity variation characteristic), then in detection process, brightness controlling device 400 can be voluntarily according to the light intensity of light source 100
Variation characteristic judges the light intensity situation of change of each moment light source 100 in detection process, and then the adjustment light that takes appropriate measures
The light intensity in source 100, so as to get the light light intensity up to detecting plate 300 keeps constant as far as possible, to cause the brightness of scan image to exist
As all keep constant as possible in whole detection process, so as to meet detection demand.For example：Brightness controlling device 400 adjusts light source
The method of 100 light intensity is specially：Brightness controlling device 400 is adjusted according to the mode opposite with the light intensity variation tendency of light source 100
Whole light intensity, so as to balance out the light intensity change of light source 100 itself.In addition, if the change of the light intensity different at the time of of light source 100
Degree is different, then brightness controlling device 400 is not also corresponding different to the adjusted value of light intensity in the same time accordingly.
Therefore, in the above-mentioned optical system that embodiment of the present invention is provided, brightness controlling device 400 can in detection process
Voluntarily persistently to adjust the light intensity of light source 100 according to the variation tendency of light source 100 itself light intensity, so that light source 100
Light intensity is maintained under optimal testing conditions as far as possible, and the light intensity that can improve light source 100 changes with the time and influences inspection
The problem of surveying effect, improves the precision of detection.
In one of the embodiments, the light intensity of light source 100 decays with the time.Further, brightness controlling device 400
The characteristic decayed according to the light intensity of light source 100 with the time, every the light intensity of setting time section enhancing primary source 100, is swept with reducing
The degree that the brightness of tracing picture changes in detection process.
Fig. 2 shows the one of which adjustment curve schematic diagram of light intensity when light source 100 is metal halid lamp.In fig. 2, I
Represent light intensity value.T represents the time.The attenuation curve that curve a changes over time for the light intensity of light source 100.Curve b is brilliance control
Adjustment curve of the device 400 to light source 100.Therefore, it is finally to expose to board under test 300 after curve a and curve b is merged
Total light intensity.Next illustrate：In automatic detection system, (i.e. the summation of some parameter settings, includes inspection to recipe
Used precision, light source, brightness, the size of detection zone, position etc. during survey) the middle corresponding scanning figure of light intensity value 90 set
The maximum gray value of picture is 210, then after light source 100 has used a period of time T, the light intensity attenuation aggravation of light source, at this moment most
Big grey decision-making 210, which needs actual light intensity value to become 120 from original 90, to be met, therefore, and brightness controlling device 400 accordingly increases
Plus the light intensity value of light source 100 is so that maximum gray value is 210 to remain in that as 210.
In one of the embodiments, it refer to Fig. 3.Brightness controlling device 400 includes timer 410 and optical modulator module
420.Timer 410 and optical modulator module 420 are electrically connected.
Wherein, timer 410 provides real-time temporal information to optical modulator module 420.For example, timer 410 can be
Timer.The characteristic that optical modulator module 420 is changed over time according to the light intensity of above-mentioned temporal information and light source 100 recognizes light source
100 current light intensity, and according to the light intensity that light source 100 is adjusted during the fructufy of identification, treated with reducing to expose in detection process
Difference between the actual light intensity of drafting board 300 and the initial set value of light intensity.
Therefore, the temporal information that optical modulator module 420 is provided according to timer 410 is capable of making for real-time awareness light source 100
With the time, so as to analyze the situation of change of each light intensity of moment light source 100 according to the light intensity variation characteristic of light source 100.For example, such as
The light intensity of fruit light source 100 decays with the time, and the degree of decay is increasing, then optical modulator module 420 is sentenced according to temporal information
The disconnected light source 100 current use moment also in attenuation degree it is less interval when, then it is corresponding that light source is strengthened with less amplitude
100 light intensity；If it is determined that the use time of light source 100 is longer and when reaching the larger interval of attenuation degree, then phase
The light intensity of light source 100 should be strengthened with larger amplitude.
Specifically, Fig. 4 is refer to, optical modulator module 420 includes electrooptic modulator 421 and control unit 422.Electro-optical Modulation
Device 421 and control unit 422 are electrically connected.Also, control unit 422 is electrically connected with timer 410.
Wherein, electrooptic modulator 421 is used to be modulated light source 100.Also, the light that light source 100 is sent passes through electricity
Optical modulator 421 is launched to board under test 300.Electrooptic modulator 421 is to utilize some electro-optic crystals, such as lithium columbate crystal
(LiNb03), gallium arsenide crystal (GaAs) and the lithium tantalate (modulator that=(LiTa03) electrooptic effect is made.Electric light is imitated
Should be that, when applying voltages on electro-optic crystal, the refractive index of electro-optic crystal will change, and as a result cause by the crystal
The change of light wave characteristic, realizes the modulation to the phase of optical signal, amplitude, intensity and polarization state.Therefore, add as long as changing
It is loaded in the voltage of electro-optic crystal in electrooptic modulator 421, you can change input to the light intensity of the light of electrooptic modulator 421.
The characteristic that control unit 422 is changed over time according to the light intensity of above-mentioned temporal information and light source 100 recognizes light source 100
Current light intensity, and the voltage on electrooptic modulator 421 is carried according to adjustment during the fructufy of identification, to reduce detection process
In expose to the difference between the actual light intensity of board under test 300 and the initial set value of light intensity.For example：If control unit 422
The Characteristics Detection changed over time according to the light intensity of above-mentioned temporal information and light source 100 is in the light intensity of light source 100 to decline
When subtracting state, then corresponding increase is carried in the voltage on electrooptic modulator 421.
Therefore, in detection process, the light that light source 100 is sent is introduced into electrooptic modulator 421, when the light intensity of light source 100
When having begun to be in attenuation state, control unit 422 increases the voltage for being loaded onto electrooptic modulator 421, so that electric light
The final light intensity launched to board under test 300 of modulator 421 is maintained to the light intensity value before light source 100 is not decayed, and then
Ensure the brightness constancy of scan image.
Wherein, control unit 422 for example can include single-chip microcomputer (or other possess the integrated circuit of data-handling capacity),
Memory and change-over circuit, wherein, single-chip microcomputer is electrically connected with memory, change-over circuit, timer 410 respectively.Memory storage
There are the light intensity variation characteristic data of light source 100.Single-chip microcomputer is to the different pwm signal of change-over circuit output duty cycle.Change-over circuit
Pwm signal is converted into DC voltage, and DC voltage is loaded onto electrooptic modulator 421.Therefore, it is single in detection process
Piece machine real-time reception timer 410 send temporal information, and from memory extract light source 100 light intensity variation characteristic number
According to, meanwhile, single-chip microcomputer recognizes the current light intensity of light source 100 according to temporal information and the light intensity variation characteristic data of light source 100, and
According to pwm signal of the output with corresponding dutycycle during the fructufy of identification, then by change-over circuit by the direct current being converted to
Voltage-drop loading is to electrooptic modulator 421, so as to adjust the light intensity of light source 100 in real time.
It is understood that the concrete structure of optical modulator module 420 is not limited to above-mentioned situation, such as optical modulator module 420
Other types can also be taken to carry out the optical modulator of external modulation to light source 100, or optical modulator module 420 can also be adopted
The light intensity of light source 100, i.e. modulated signal is adjusted with the mode of internal modulation to be loaded directly on light source 100 changing the ginseng of light source
Number, so as to change the output characteristics of light source 100.
Another embodiment provides a kind of automated optical detection equipment, including light source and video capturing device, the shadow
As acquisition device is used to be scanned board under test to obtain scan image.The automated optical detection equipment also includes brightness control
Device processed.The characteristic that the brightness controlling device is changed over time according to the light intensity of the light source, is adjusted every setting time section
The once light intensity of the light source, the initial of the actual light intensity of the board under test and the light intensity is exposed to reduce in detection process
Difference between setting value.
In one of the embodiments, the light intensity of the light source decays with the time.
In one of the embodiments, the spy that the brightness controlling device is decayed according to the light intensity of the light source with the time
Property, strengthen once the light intensity of the light source every setting time section.
In one of the embodiments, the brightness controlling device includes timer and optical modulator module.The timer
With optical modulator module electrical connection.
The timer provides real-time temporal information to the optical modulator module.The optical modulator module according to it is described when
Between the characteristic that changes over time of information and the light intensity of the light source recognize the current light intensity of the light source, and according to the identification
The light intensity of the light source is adjusted during fructufy, to reduce actual light intensity and the light that the board under test is exposed in detection process
Difference between strong initial set value.
In one of the embodiments, the optical modulator module includes electrooptic modulator and control unit.The electric light is adjusted
Device processed and described control unit electrical connection.Also, described control unit is connected with the timer.
The electrooptic modulator is used to be modulated the light source.Described control unit is according to the temporal information and institute
State the characteristic that the light intensity of light source changes over time and recognize the current light intensity of the light source, and according to adjustment during the fructufy of identification plus
The voltage of the electrooptic modulator is loaded onto, to reduce actual light intensity and the light intensity that the board under test is exposed in detection process
Initial set value between difference.
It should be noted that the principle of each structure for the automated optical detection equipment that present embodiment is provided is implemented with upper one
Mode is identical, just repeats no more here.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of optical system, the optical system includes light source；The automated optical detection equipment also includes image capturing and filled
Put, and the video capturing device is used to board under test is scanned to obtain scan image；Characterized in that, the optical system
System also includes brightness controlling device；The characteristic that the brightness controlling device is changed over time according to the light intensity of the light source, every
The light intensity of the setting time section adjustment once light source, with reduce exposed in detection process the actual light intensity of the board under test with
Difference between the initial set value of the light intensity.
2. optical system according to claim 1, it is characterised in that the light intensity of the light source decays with the time.
3. optical system according to claim 2, it is characterised in that the brightness controlling device is according to the light of the light source
The strong characteristic decayed with the time, the light intensity of the light source is strengthened once every setting time section.
4. the optical system according to any claim in claims 1 to 3, it is characterised in that the brilliance control dress
Put including timer and optical modulator module；The timer and optical modulator module electrical connection；
The timer provides real-time temporal information to the optical modulator module；The optical modulator module is believed according to the time
The characteristic that the light intensity of breath and the light source is changed over time recognizes the current light intensity of the light source, and according to the result of the identification
The light intensity of the light source is adjusted in real time, to reduce actual light intensity and the light intensity that the board under test is exposed in detection process
Difference between initial set value.
5. optical system according to claim 4, it is characterised in that the optical modulator module includes electrooptic modulator and control
Unit processed；The electrooptic modulator is electrically connected with described control unit；Also, described control unit is connected with the timer；
The electrooptic modulator is used to be modulated the light source；Described control unit is according to the temporal information and the light
Characteristic that the light intensity in source is changed over time recognizes the current light intensity of the light source, and is loaded onto according to adjustment during the fructufy of identification
The voltage of the electrooptic modulator, with reduce exposed in detection process the actual light intensity of the board under test and the light intensity just
Difference between beginning setting value.
6. a kind of automated optical detection equipment, including light source and video capturing device, the video capturing device are used for to be measured
Plate is scanned to obtain scan image；Characterized in that, the automated optical detection equipment also includes brightness controlling device；Institute
The characteristic that brightness controlling device is changed over time according to the light intensity of the light source is stated, the once light is adjusted every setting time section
Between the light intensity in source, the initial set value to reduce actual light intensity and the light intensity that the board under test is exposed in detection process
Difference.
7. automated optical detection equipment according to claim 6, it is characterised in that the light intensity of the light source declines with the time
Subtract.
8. automated optical detection equipment according to claim 7, it is characterised in that the brightness controlling device is according to described
The characteristic that the light intensity of light source decays with the time, the light intensity of the light source is strengthened once every setting time section.
9. the automated optical detection equipment according to any claim in claim 6 to 8, it is characterised in that described bright
Spending control device includes timer and optical modulator module；The timer and optical modulator module electrical connection；
The timer provides real-time temporal information to the optical modulator module；The optical modulator module is believed according to the time
The characteristic that the light intensity of breath and the light source is changed over time recognizes the current light intensity of the light source, and according to the result of the identification
The light intensity of the light source is adjusted in real time, to reduce actual light intensity and the light intensity that the board under test is exposed in detection process
Difference between initial set value.
10. automated optical detection equipment according to claim 9, it is characterised in that the optical modulator module includes electric light
Modulator and control unit；The electrooptic modulator and described control unit electrical connection；Also, described control unit and the meter
When device connect；
The electrooptic modulator is used to be modulated the light source；Described control unit is according to the temporal information and the light
Characteristic that the light intensity in source is changed over time recognizes the current light intensity of the light source, and is loaded onto according to adjustment during the fructufy of identification
The voltage of the electrooptic modulator, with reduce exposed in detection process the actual light intensity of the board under test and the light intensity just
Difference between beginning setting value.
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| CN201710369972.1A CN107228859A (en) | 2017-05-23 | 2017-05-23 | Optical system and automated optical detection equipment |
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| CN201710369972.1A CN107228859A (en) | 2017-05-23 | 2017-05-23 | Optical system and automated optical detection equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020077774A1 (en) * | 2018-10-16 | 2020-04-23 | 歌尔股份有限公司 | Hue error compensation method and projection device |
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