CN107787177A - Optical imaging system for electronic component pin positioning - Google Patents
Optical imaging system for electronic component pin positioning Download PDFInfo
- Publication number
- CN107787177A CN107787177A CN201610716583.7A CN201610716583A CN107787177A CN 107787177 A CN107787177 A CN 107787177A CN 201610716583 A CN201610716583 A CN 201610716583A CN 107787177 A CN107787177 A CN 107787177A
- Authority
- CN
- China
- Prior art keywords
- light source
- arc sub
- electronic component
- gobo
- led
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
- H05K13/0015—Orientation; Alignment; Positioning
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
- G03B15/02—Illuminating scene
Abstract
The present invention relates to a kind of optical imaging system for electronic component pin positioning, including CCD camera and light source, the light source includes the first arc sub-light source and the second arc sub-light source, the first arc sub-light source and the second arc sub-light source be oppositely arranged and it is spaced apart with formed between electronic component disengaging passage, and the first arc sub-light source and the second arc sub-light source also set up the first gobo and the second gobo in the region that it is each surrounded, the lower section of the passage of the CCD camera between first gobo and the second gobo.Light source design into two and half arcs and is set gobo by the system, that is, ensure that image quality, is required in a pipeline fashion by the movement velocity of light source after meeting material fetching mechanism grasping element again, meanwhile, also allow for mounting and dismounting.
Description
Technical field
The present invention relates to electronic component plug-in part technology, is used for what electronic component pin positioned more specifically to a kind of
Optical imaging system.
Background technology
With the raising that high-tech development and people are required living standard, consumption market is to compact, high-performance
Electronic product demand it is increasing.In addition present programmable integrated circuit possesses many pins, with very strong
Function, and much all employ the assembling form with innovative significance.Due to most of electronic component have it is very more
Pin number and very little appearance and size, so, how to be completed rapidly and accurately the positioning to pin be just directly connected to from
The accuracy and efficiency of dynamic inserter.
In pin position fixing process, if using common annular light source, it is ensured that the image quality of pin, but
Collection pinouts as when, it is necessary to which that specified altitude assignment among light source is inserted into above or below light source after material fetching mechanism grasping element is quiet
Only shoot, after the completion of positioning, material fetching mechanism needs that element is first removed light source, then moves again to PCB insertion positions, this is
Row action can cause the reduction of whole system efficiency；If use common strip source, it is ensured that material fetching mechanism grasping element
Afterwards in a pipeline fashion among two strip sources by improving system effectiveness, but image quality can not ensure, to positioning
Analytic band carrys out difficulty.Both the above situation, meet that automation plug-in unit fast and accurately requires very well while all can not be, can not
Adapt to the production requirement of automation inserter.
The content of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, there is provided one kind is used for electronics member
The optical imaging system of part pin positioning, it can guarantee that image quality and can facilitates electronic component disengaging to improve system effectiveness.
The technical solution adopted for the present invention to solve the technical problems is：It is proposed a kind of optics of electronic component pin positioning
Imaging system, including CCD camera and light source, the light source include the first arc sub-light source and the second arc sub-light source, and described
One arc sub-light source and the second arc sub-light source are respectively provided with least one LED, the first arc sub-light source and the second arc
Light source is oppositely arranged and spaced apart to form the passage of electronic component disengaging, and first arc between
Shape sub-light source and the second arc sub-light source also set up the first gobo and the second gobo in the region that it is each surrounded, described
The lower section of the passage of the CCD camera between first gobo and the second gobo.
According to one embodiment of present invention, the first arc sub-light source and the second arc sub-light source have identical
Radian.
According to one embodiment of present invention, the first arc sub-light source and the second arc sub-light source are respectively provided with multiple
LED, the multiple curved settings of LED.
According to one embodiment of present invention, the LED is red-light LED.
According to one embodiment of present invention, LED quantity is by controlling each pixel on CCD to obtain in the light source
Illumination received positioned at minimum between illumination and maximum load illumination to determine.
Implement the optical imaging system for being used for electronic component pin positioning of the present invention, have the advantages that：This is
Light source design is set gobo by system into two and half arcs and respectively in both sides, that is, be ensure that image quality, met feeding again
In a pipeline fashion by the movement velocity requirement of light source after mechanism grasping element, meanwhile, also allow for mounting and dismounting.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the structural representation of the optical imaging system for being used for electronic component pin positioning of one embodiment of the invention
Figure；
Fig. 2 is the top view of light source in Fig. 1；
Fig. 3 is aberration schematic diagram；
Fig. 4 is typical CCD spectral response curves；
Fig. 5 is red-light LED light source relative spectral power distributions figure；
Fig. 6 is the schematic diagram for the luminous flux that bin is formed；
Fig. 7 is the design sketch of the electronic component photo of the optical imaging system collection of one embodiment of the invention；
Fig. 8 is the design sketch of electronic component photo for being not provided with gathering in the case of gobo.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As depicted in figs. 1 and 2, the optical imagery system according to an embodiment of the invention for electronic component pin positioning
System is mainly made up of CCD camera 10 and light source, and the light source includes the first arc sub-light source 21 and the second arc sub-light source 22, often
One arc sub-light source 21 and 22 all has the LED 23 of multiple curved settings.It is shown in Figure 2, the He of the first arc sub-light source 21
Second arc sub-light source 22 can have identical radian, and the two is oppositely arranged and spaced apart, so as to wrap between
Cross a border circular areas and form the passage 24 that electronic component 40 passes in and out between.
CCD camera 10 is arranged on the lower section of the passage 24 between the first arc sub-light source 21 and the second arc sub-light source 22.
The crawl of material fetching mechanism 30 electronic component 40 is in a pipeline fashion between the first arc sub-light source 21 and the second arc sub-light source 22
Passage 24 dynamic image acquisition is carried out to the pin of electronic component 40 by, high-resolution, the CCD camera of high speed 10, take pictures
When do not need electronic component 40 remain static, so as to improve the efficiency of whole system.Meanwhile the He of the first arc sub-light source 21
Second arc sub-light source 22 can provide the lighting effect substantially close to annular light source, it is ensured that the imaging of electronic component pin
Quality.
Further as shown in Fig. 2 the first arc sub-light source 21 and the second arc sub-light source 22 are in the region that it is each surrounded
Be additionally provided with the first gobo 25 and the second gobo 26, for CCD camera 10 gather pinouts as when background light enter
Row blocks.In principle, due to just dissipating for LED light source, if be not provided with the first gobo 25 and the second gobo 26, first
The parallel rays of the arc sub-light source 22 of arc sub-light source 21 and second transmitting is while component pin is illuminated, upward light meeting
The other places of element are illuminated, as shown in figure 8, pin, as the other local brightness of element, location algorithm, which can not be accurately positioned, to be drawn
Pin.And the application sets the first gobo 25 and second to hide respectively on the first arc sub-light source 21 and the second arc sub-light source 22
Light cloth 26, while parallel rays is pointed into component pin, the light irradiated upwards is completely by the first gobo 25 and the second shading
Cloth 26 blocks absorption, simultaneously as gobo softness material, will not also produce the reflection of light, light can not be irradiated to element
Place beyond pin, so that component pin forms obvious contrast with other places, as shown in fig. 7, algorithm can be accurate
Setting element pin position.
In addition, according to a preferred embodiment of the invention, the first arc sub-light source 21 and the second arc sub-light source 22 are adopted
LED 23 is red-light LED, and principle is as follows：
Light source colour is divided into polychromatic light (white light) and monochromatic light.Because lens material is different to the refractive index of various coloured light,
Therefore lens are also just different to the focal length of white light, and the size being imaged is decided by focal length with position, so aberration has position
Two kinds of aberration (i.e. longitudinal chromatic aberration) and the chromatic difference of magnification (i.e. lateral chromatic aberration).As shown in figure 3, P is the main shaft that white light source is located at lens
On, because of dispersion rather than converged at a bit by dipped beam Axial Bundle imaging, the deflecting light beams of feux rouges image in point P'C, blue light
Deflecting light beams image in point P'F.If an optical screen is put in plane C as center be red, be around it is colored, periphery
In bluish violet.If optical screen is placed in F planes, as center be blueness, surrounding also chromatic colour, periphery is red.Work as light
Screen is between plane F and C when moving, as colour can gradually change.And the generation of this phenomenon can be then avoided with monochromatic light.Institute
When the color selection using black and white camera, and to measured object does not have particular/special requirement, more be closed than white light from monochromatic light
It is suitable.And according to typical CCD spectral response curves as shown in Figure 4, the emission wavelength of red-light LED is closer to the sensitive of CCD camera
Spend peak value.In addition, red-light LED long lifespan, stably, it is cheap.So preferred feux rouges of optical imaging system that the present invention designs
LED light source.
Further, used by the first arc sub-light source 21 and the second arc sub-light source 22 LED quantity by controlling CCD
The illumination that each pixel obtains on camera 10 determines between minimal illumination and maximum load illumination, specific as follows：
The pin of electronic component is generally leypewter, and surface is the Plastic Packages such as each based epoxy resin, in direct projection condition
Under, the reflectivity of leypewter is about 50%-60%, and the reflectivity of plastics is about 15%-40%, therefore can be according to reflectivity
Difference distinguishes both.After determining LED light source color, the most important illumination for being to calculate tested surface, CCD pixel is calculated
The illumination of receiving, the foundation of irradiation model is completed, according to this come the number of the LED needed for determining to meet under illumination conditions.
In order to calculate whether illumination energy is really achieved requirement, it is necessary to the size of light energy be calculated, so that it is determined that LED number
The other specification such as mesh and power.LED of the power for P is used, its electro-optic conversion rate is η, then luminous flux is：
Wherein, λ be LED light source wavelength, φλTo be tested LED spectral power distribution, can be tested by spectroanalysis instrument
Arrive, as shown in Figure 5；For luminous efficacy, i.e., the monochromatic light radiant flux of a certain wavelength can produce how many phase
The monochromatic luminous flux answered, there is maximum K when wavelength is 555nmm, its value is 683lm/W；
For luminous efficiency, φvFor luminous flux, φγFor radiation flux.
Because K (λ) belongs to experimental data, therefore according to CIE luminous efficiency curves, luminous flux can be calculated with following formula：
φv=KmV(λ)φγ=683V (λ) φγ (2)
Wherein, radiation flux φγUnit be W.When it is 1W to take radiation of light source flux, any of measured object can be obtained
Point illumination be：
Wherein, dS is the bin of measured object surface any point.The light that measured object is sent enters CCD by lens, and CCD has
Minimum receives illumination and maximum load illumination, the light intensity of incidence is between this two value, is only possible to obtain good image.
The pixel obtained from Fig. 6 corresponds to a certain unit dS of measured object, due to optical numerical aperture NA values compared with
It is small, and CCD and measured object are typically distant, the curvature of lens can be ignored, therefore it is bin dS' that can be approximately considered lens,
And perpendicular to optical axis.The light intensity for falling on measured object is E, reflectivity R, then reflective light intensity B=E × R/ π.Optical system printing opacity system
Number is K, and the area in CCD faces array area domain corresponding to a pixel is dS ", then can obtain the illumination that each pixel obtains on CCD and be：
Wherein, θ is certain point on testee to CCD incident ray and the angle of its normal, r0For measured object and thoroughly
The distance between mirror, as shown in Figure 6.
Parameters are relevant with the coordinate (i, j) of time t or each pixel in ccd image coordinate system, therefore above formula
(4) can be expressed as：
The other parameters such as number and power by suitably adjusting LED, E " is in minimum receive that CCD is received and shine
, can be to obtain good picture quality between degree and maximum load illumination.For example, it is assumed that captured electronic component pin length
For 4mm, in order to be accurately positioned pin, it is necessary to which the length illuminated is 1.5mm or so, in order to just be irradiated to the pin of needs length
Degree, while it is not irradiated to other parts, it is assumed that single led a diameter of dmm, the outer diameter D of LED light source can be calculated:
D=d/ (4-1.5) * 25+25 (6)
And LED is in half arc shooting, can primarily determine that LED particle number according to LED sizes and light source external diameter, finally lead to
The optical design software ZEMAX simulation parameters such as LED dot matrix, the luminous flux by adjusting LED numbers and each LED are crossed, make its light
Illumination meets E " requirement.
From the point of view of experimental result, the central effective lighting regional diameter of optical imaging system according to embodiments of the present invention is about
For 50mm or more, general electronic component-sized is in below 40*40mm, therefore visual field meets design requirement；In terms of uniformity, from
Color coordinates in design sketch 7 calculates the uniformity coefficient ((highest illumination-minimal illumination)/average illumination) in effective lighting region
Control is more than 0.9, much larger than the 0.7 of the requirement of industrial lighting design standard., can by controlling CCD electronic shutter and aperture
The overexposure of imaging is controlled, while the high illumination illumination required when high electronic shutter shoots electronic component can be met.From
As can be seen that electronic component pin is white in shooting image, its ambient background is black, and contrast clearly, is easy to pin
Position, quality analysis, and material fetching mechanism can smoothly pass in and out light source.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (5)
1. a kind of optical imaging system for electronic component pin positioning, including CCD camera and light source, it is characterised in that institute
Stating light source includes the first arc sub-light source and the second arc sub-light source, and the first arc sub-light source and the second arc sub-light source are equal
With at least one LED, the first arc sub-light source and the second arc sub-light source be oppositely arranged and it is spaced apart with
Therebetween the passage of electronic component disengaging is formed, and the first arc sub-light source and the second arc sub-light source are each at its
The first gobo and the second gobo are also set up from the region of encirclement, the CCD camera is located at first gobo and second
The lower section of the passage between gobo.
2. the optical imaging system according to claim 1 for electronic component pin positioning, it is characterised in that described the
One arc sub-light source and the second arc sub-light source have identical radian.
3. the optical imaging system according to claim 1 for electronic component pin positioning, it is characterised in that described the
One arc sub-light source and the second arc sub-light source are respectively provided with multiple LED, the multiple curved settings of LED.
4. the optical imaging system according to claim 3 for electronic component pin positioning, it is characterised in that described
LED is red-light LED.
5. the optical imaging system for being used for electronic component pin positioning according to any one of claim 1-4, its feature
It is, LED quantity is by controlling the illumination that each pixel obtains on CCD to receive illumination and maximum positioned at minimum in the light source
Determined between load illumination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610716583.7A CN107787177A (en) | 2016-08-24 | 2016-08-24 | Optical imaging system for electronic component pin positioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610716583.7A CN107787177A (en) | 2016-08-24 | 2016-08-24 | Optical imaging system for electronic component pin positioning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107787177A true CN107787177A (en) | 2018-03-09 |
Family
ID=61388345
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610716583.7A Pending CN107787177A (en) | 2016-08-24 | 2016-08-24 | Optical imaging system for electronic component pin positioning |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11523552B2 (en) | 2020-09-08 | 2022-12-06 | Delta Electronics, Inc. | Automatic insertion apparatus |
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| US11523552B2 (en) | 2020-09-08 | 2022-12-06 | Delta Electronics, Inc. | Automatic insertion apparatus |
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