CN117330509A - Optical appearance detection equipment - Google Patents
Optical appearance detection equipment Download PDFInfo
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- CN117330509A CN117330509A CN202311396935.1A CN202311396935A CN117330509A CN 117330509 A CN117330509 A CN 117330509A CN 202311396935 A CN202311396935 A CN 202311396935A CN 117330509 A CN117330509 A CN 117330509A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 87
- 238000001514 detection method Methods 0.000 title claims abstract description 63
- 238000003384 imaging method Methods 0.000 claims abstract description 59
- 238000007689 inspection Methods 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 3
- 238000005286 illumination Methods 0.000 abstract description 17
- 230000007547 defect Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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Abstract
The invention discloses an optical appearance detection device. The method comprises the following steps: a light source module and an imaging detection module; the light source module comprises a coaxial light source, a first angle light source and a second angle light source; the coaxial light source is used for emitting coaxial light beams to the circuit board to be tested; the first angle light source is used for emitting a first angle light beam to the circuit board to be tested; the second angle light source is used for emitting a second angle light beam to the circuit board to be tested; the imaging detection module is used for imaging according to the coaxial light beam, the first angle light beam and the second angle light beam reflected by the circuit board to be detected. According to the technical scheme, the coaxial light source, the first angle light source and the second angle light source provide all-dimensional and multi-angle illumination for the imaging detection module, so that the imaging precision of the optical appearance detection equipment is improved, the defect detection rate of the optical appearance detection equipment is also improved, and the false detection of qualified products and unqualified products of the circuit board is avoided.
Description
Technical Field
The invention relates to the technical field of optical detection, in particular to optical appearance detection equipment.
Background
With the development of electronic technology, the status of printed circuit boards (Printed Circuit Board, PCB) in the electronics industry has become very important as production technology has increased. An automatic optical appearance inspection machine (Automated Visual Inspection, AVI) is a PCB inspection device that integrates optical, mechanical, electrical and automatic inspection, and the system requires high illumination for optical imaging and optical systems.
In the prior art, the illumination angle of an optical system of the AVI is single, and the all-dimensional multi-angle illumination of the inner wall of the hole and the tin ball cannot be realized, so that the photoelectric conversion and the subsequent image processing are directly influenced, and the false detection of qualified products and unqualified products is caused.
Disclosure of Invention
The invention provides optical appearance detection equipment, which solves the problem that in the prior art, the illumination angle of an AVI optical system is single, so that the imaging quality is poor.
An optical appearance detecting apparatus of the present invention includes:
a light source module and an imaging detection module;
the light source module comprises a coaxial light source, a first angle light source and a second angle light source;
the coaxial light source is used for emitting coaxial light beams to the circuit board to be tested; the first angle light source is used for emitting a first angle light beam to the circuit board to be tested; the second angle light source is used for emitting a second angle light beam to the circuit board to be tested; a first included angle exists between the main optical axis direction of the first angle light beam and the main optical axis direction of the coaxial light beam, a second included angle exists between the main optical axis direction of the second angle light beam and the main optical axis direction of the coaxial light beam, and the first included angle and the second included angle are different;
the imaging detection module is arranged on the propagation paths of the coaxial light beam, the first angle light beam and the second angle light beam after being reflected by the circuit board to be detected and is used for imaging according to the coaxial light beam, the first angle light beam and the second angle light beam reflected by the circuit board to be detected.
Optionally, the optical appearance detection device further comprises a light emergent caliber; the coaxial light beam, the first angle light beam and the second angle light beam are all incident on the circuit board to be tested through the light outlet aperture;
the light source module comprises two groups of first angle light sources; the two groups of first angle light sources are symmetrically arranged on two sides of the central axis of the light emergent caliber;
the light source module comprises two groups of second angle light sources; the two groups of second angle light sources are symmetrically arranged on two sides of the central axis of the light emergent caliber.
Optionally, the coaxial light source includes a coaxial light emitting unit and a transflective unit, the coaxial light emitting unit is used for emitting an initial coaxial light beam, and the transflective unit is arranged on a propagation path of the initial coaxial light beam and is used for reflecting the initial coaxial light beam to form a coaxial light beam;
the included angle between the main optical axis direction of the first angle beam and the main optical axis direction of the coaxial beam is less than or equal to 30 degrees;
the included angle between the main optical axis direction of the second angle beam and the main optical axis direction of the coaxial beam is larger than 30 degrees.
Optionally, the light source module further comprises a coaxial light converging lens;
the coaxial light converging lens is disposed on a propagation path of the initial coaxial light beam for converging the initial coaxial light beam from the planar light beam into a linear light beam.
Optionally, the imaging detection module comprises a line scan camera.
Optionally, the light source module further comprises a coaxial light homogenizing lens;
the coaxial beam splitter is arranged in the propagation direction of the linear light beam; the coaxial beam splitter comprises an incident transmission surface and an emergent scattering surface and is used for modulating the linear light beam to form a linear beam splitter.
Optionally, the light source module further comprises an angle light homogenizing lens;
the angle beam splitter is arranged on the propagation paths of the first angle beam and the second angle beam; the angle light homogenizing lens comprises an incident transmission surface and an emergent scattering surface and is used for modulating the first angle light beam to form a first angle light homogenizing beam and modulating the second angle light beam to form a second angle light homogenizing beam.
Optionally, an included angle c between the plane of the circuit board to be tested and the main optical axis direction of the coaxial light beam is more than or equal to 70 degrees and less than or equal to 90 degrees. Optionally, the light source module further includes a plurality of groups of cooling fins;
the radiating fins are respectively arranged at one side of the coaxial light source, the first angle light source and the second angle light source.
Optionally, the optical appearance detection device further comprises a control unit;
the control unit is respectively in communication connection with the coaxial light source, the first angle light source and the second angle light source and is used for respectively adjusting the brightness of the coaxial light beam, the first angle light beam and the second angle light beam.
According to the technical scheme, the coaxial light source, the first angle light source and the second angle light source are arranged in the optical appearance detection device, so that the coaxial light source, the first angle light source and the second angle light source can provide all-directional and multi-angle illumination for the imaging detection module, the accuracy of imaging the front surface of the circuit board to be detected is improved by the coaxial light source, the accuracy of imaging the convex element, the concave element and the inner wall of the circuit board hole to be detected is improved by the first angle light source and the second angle light source, the imaging accuracy of the optical appearance detection device is improved, the defect detection rate of the optical appearance detection device is improved, and the false detection of qualified products and unqualified products of the circuit board is avoided.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an optical appearance detecting device according to an embodiment of the present invention;
fig. 2 is an exploded view of a light source module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an assembly structure of a light source module according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
Fig. 1 is a schematic diagram of an optical appearance inspection apparatus according to an embodiment of the present invention, fig. 2 is a schematic diagram of an exploded structure of a light source module according to an embodiment of the present invention, fig. 3 is a schematic diagram of an assembled structure of a light source module according to an embodiment of the present invention, and fig. 1, 2 and 3 provided by the embodiment of the present invention only show specific structures of a light source module 1 and an imaging inspection module 2 in the optical appearance inspection apparatus, and the light source module 1 includes a coaxial light source 11, a first angle light source 12 and a second angle light source 13, as shown in conjunction with fig. 1, 2 and 3;
the coaxial light source 11 is used for emitting a coaxial light beam 110 to the circuit board 3 to be tested; the first angle light source 12 is configured to emit a first angle light beam 120 to the circuit board 3 to be tested; the second angle light source 13 is configured to emit a second angle light beam 130 to the circuit board 3 to be tested; a first included angle a exists between the main optical axis direction of the first angle beam 120 and the main optical axis direction of the coaxial beam 110, a second included angle b exists between the main optical axis direction of the second angle beam 130 and the main optical axis direction of the coaxial beam 110, and the first included angle a and the second included angle b are different;
the imaging detection module 2 is disposed on a propagation path of the coaxial light beam 110, the first angle light beam 120 and the second angle light beam 130 after being reflected by the circuit board 3 to be detected, and is used for imaging according to the coaxial light beam 110, the first angle light beam 120 and the second angle light beam 130 reflected by the circuit board 3 to be detected.
The optical appearance detection equipment can compare the appearance of the standard circuit board with the appearance of the acquired circuit board through acquiring the appearance image of the circuit board and output a comparison result, so that defect detection on the appearance of the circuit board is realized. Accurate acquisition of the appearance image of the circuit board 3 to be tested is therefore critical to the accuracy of the optical appearance inspection apparatus. The accurate acquisition of the appearance image of the circuit board 3 to be tested is related to the imaging precision of the camera on one hand, and the illumination angle, illumination brightness and illumination uniformity of the light source module 1 on the other hand. The light source module 1 in the embodiment of the invention comprises a coaxial light source 11, a first angle light source 12 and a second angle light source 13, wherein the coaxial light source 11 is used for emitting a coaxial light beam 110, and the coaxial light source 11 has the characteristics that the main optical axis of the coaxial light beam 110 is parallel to the main optical axis of the coaxial light beam 110 reflected by the circuit board 3 to be tested, so that the coaxial light source 11 can better provide illumination to the circuit board surface for the imaging detection module 2, and the problem of missing or unclear front imaging of the circuit board 3 to be tested is solved; the first angle light source 12 may be a light source different from the illumination direction of the coaxial light beam 110, and the main optical axis direction of the first angle light beam 120 has a first included angle a with the main optical axis direction of the coaxial light beam 110, so that the first angle light source 12 may provide illumination in the main optical axis direction of the first angle light beam 120 for the imaging detection module 2, so as to solve the problem of inaccurate imaging of the protruding element or the recessed element on the circuit board 3 to be detected; the second angle light source 13 may be a light source different from the illumination directions of the coaxial light beam 110 and the first angle light beam 120, and the second angle light source 13 may provide illumination in the main optical axis direction of the second angle light beam 130 for the imaging detection module 2, and because the first angle a and the second angle b are different, the first angle light beam 120 and the second angle light beam 130 can solve the problem of inaccurate imaging of the protruding element or the recessed element on the circuit board 3 to be detected, such as the problem of black shadow of solder ball imaging on the circuit board 3 to be detected and the problem that the inner wall of the hole is difficult to detect.
The imaging detection module 2 may include a camera, and the imaging detection module 2 may receive the coaxial light beam 110, the first angle light beam 120, and the second angle light beam 130 reflected by the circuit board 3 to be tested and perform imaging according to the coaxial light beam 110, the first angle light beam 120, and the second angle light beam 130. In order to ensure the accuracy of the imaging detection module 2 and improve the utilization rate of the light source module 1, the camera lens in the imaging detection module 2 can be arranged on the coaxial light beam 110 after being reflected by the circuit board 3 to be detected, so that the coaxial light beam 110 after being reflected by the object to be detected can directly enter the camera, the reflection of the camera lens is avoided, and the imaging accuracy is improved.
According to the technical scheme, the coaxial light source, the first angle light source and the second angle light source are arranged in the optical appearance detection device, so that the coaxial light source, the first angle light source and the second angle light source can provide all-directional and multi-angle illumination for the imaging detection module, the accuracy of imaging the front surface of the circuit board to be detected is improved by the coaxial light source, the accuracy of imaging the convex element, the concave element and the inner wall of the circuit board hole to be detected is improved by the first angle light source and the second angle light source, the imaging accuracy of the optical appearance detection device is improved, the defect detection rate of the optical appearance detection device is improved, and the false detection of qualified products and unqualified products of the circuit board is avoided.
Optionally, with continued reference to fig. 1, 2 and 3, the optical appearance detecting device further includes a light-emitting aperture; the coaxial light beam 110, the first angle light beam 120 and the second angle light beam 130 are all incident on the circuit board 3 to be tested through the light emergent aperture;
the light source module 1 comprises two groups of first angle light sources 12; the two groups of first angle light sources 12 are symmetrically arranged on two sides of the central axis of the light emergent caliber;
the light source module 1 comprises two groups of second angle light sources 13; the two groups of second angle light sources 13 are symmetrically arranged on two sides of the central axis of the light emergent caliber.
Wherein, the coaxial light beam 110 shown in fig. 1 can be multiplexed into the central axis of the light-exiting aperture. The circuit board 3 to be tested can be arranged near one side of the light outlet aperture, and the coaxial light beam 110, the first angle light beam 120 and the second angle light beam 130 are all incident on the circuit board 3 to be tested along one side of the light outlet aperture. The light source module 1 comprises two groups of first angle light sources 12, and the two groups of first angle light sources 12 are symmetrical along the central axis of the light emergent caliber; the circuit board 3 to be tested is provided with five paths of light beams, namely a group of coaxial light beams 110, two groups of first angle light beams 120 and two groups of second angle light beams 130, along the light outlet aperture, because the two groups of second angle light sources 13 are symmetrical along the central axis of the light outlet aperture.
According to the technical scheme, the two groups of symmetrical first angle light sources and the two groups of symmetrical second angle light sources are arranged on the two sides of the central axis of the light emergent caliber, so that light beams incident to the circuit board to be tested in the light emergent caliber range are five paths of light beams, and when the convex element and the concave element exist on the circuit board, the five paths of light beams can realize omnibearing and multi-angle illumination, and the imaging precision of the imaging detection module is improved.
Alternatively, as shown in fig. 1, 2 and 3, the coaxial light source 11 includes a coaxial light emitting unit 111 and a transflective unit 112, where the coaxial light emitting unit 111 is used to emit an initial coaxial light beam 113, and the transflective unit 112 is disposed on a propagation path of the initial coaxial light beam 113 and is used to reflect the initial coaxial light beam 113 to form a coaxial light beam 110;
the angle between the main optical axis direction of the first angle beam 120 and the main optical axis direction of the coaxial beam 110 is less than or equal to 30 °;
the angle between the main optical axis direction of the second angle beam 130 and the main optical axis direction of the coaxial beam 110 is greater than 30 °.
The coaxial light emitting unit 111 may be used to emit an initial coaxial light beam 113, and the transflective unit 112 may be a half-transparent half-reflective glass, when the initial coaxial light beam 113 of the coaxial light emitting unit 111 is incident on the transflective unit 112, a part of the initial coaxial light beam 113 is reflected to become a coaxial light beam 110, and the coaxial light beam 110 is further incident on the circuit board 3 to be tested, further, the coaxial light beam 110 is reflected to the transflective unit 112 by the circuit board 3 to be tested, and is transmitted from the transflective unit 112 to the imaging detection module 2, so that the arrangement not only eliminates reflection, but also avoids reflection caused by a camera lens, thereby facilitating definition of imaging of the imaging detection module 2.
In some embodiments, the angle between the reflecting surface of the transflective unit 112 and the main optical axis direction of the coaxial beam 110 is 45 °, as shown in fig. 1, the initial coaxial beam 113 exits along the x direction, and is reflected by the 45 ° transflective unit 112 to the y direction, where the y direction is the main optical axis direction of the coaxial beam 110. The coaxial light beam 110 vertically enters the circuit board 3 to be tested, so that the problem of inaccurate front imaging of the circuit board 3 to be tested is solved.
Wherein, the included angle between the main optical axis direction of the first angle beam 120 and the main optical axis direction of the coaxial beam 110 is less than or equal to 30 °, and the first included angle a is equal to 30 ° in the figure, so that the first angle beam 120 is a low angle beam; the included angle between the main optical axis direction of the second angle and the main optical axis direction of the coaxial beam 110 is greater than 30 °, and the second included angle is 60 ° in the drawing, so that the second angle beam 130 is a high angle beam. The low-angle light beam can solve the problem that the convex element and the concave element on the circuit board 3 to be tested are difficult to image; the high-angle light beam can further solve the problem that the hole wall on the circuit board 3 to be detected is difficult to image, and the imaging precision is improved.
Optionally, as shown with continued reference to fig. 1, 2 and 3, the light source module 1 further comprises a coaxial light converging lens 4;
the coaxial light converging lens 4 is disposed on a propagation path of the initial coaxial light beam 113 for converging the initial coaxial light beam 113 from a planar light beam into a linear light beam.
Wherein the coaxial light converging lens 4 serves to converge the initial coaxial light beam 113. In order to ensure the accuracy of imaging, the coaxial light source 11 may be a surface light source, and the initial coaxial light beam 113 is a planar light beam, which may be condensed into a linear light beam when passing through the coaxial light condensing lens 4, the optical axis direction of the linear light beam being parallel to the optical axis direction of the coaxial light condensing lens 4.
Specifically, the initial coaxial beam 113 is changed into a linear beam and then enters the transflective unit 112, and since the initial coaxial beam 113 is changed into a linear beam, the coaxial beam 110 that enters the circuit board 3 to be tested after reflection is also a linear beam. The coaxial light converging lens 4 is arranged to converge as much light of the initial coaxial light beam 113 onto the optical axis of the coaxial light converging lens 4 as possible, so that the efficiency of light incidence on the circuit board 3 to be tested is improved, and the imaging quality is improved.
In some embodiments, the imaging detection module includes a line scan camera (not shown).
The working principle of the line scanning camera can be to receive a reflected light beam passing through the circuit board to be tested, wherein the reflected light beam is a linear light beam, and the reflected coaxial light beam is captured to obtain the appearance information of the circuit board to be tested. Because the sensor of the line scanning camera is formed by one line of photosensitive elements, the line scanning camera can be used as a detection object by an object moving at a high speed, so that the line scanning camera can detect the appearance condition of the circuit board to be detected when the circuit board to be detected moves, and the detection efficiency of the optical appearance detection equipment is improved.
It will be appreciated that the coaxial light converging lens 4 also has the effect of adapting the coaxial light beam 110 to a linear light beam to a line scanning camera.
Optionally, with continued reference to fig. 1, 2 and 3, the light source module 1 further comprises a coaxial light homogenizing lens 5;
the coaxial beam splitter 5 is arranged in the propagation direction of the linear beam; the coaxial beam splitter 5 comprises an entrance transmission surface and an exit scattering surface for modulating the linear light beam to form a linear beam of light.
Because the surface structure of the circuit board 3 to be tested is uneven, the surface scratch or the concave position will have a darker shadow in the image, and when the light incident on the circuit board 3 to be tested irradiates on the convex element, the shadow of the convex element may be left on the circuit board 3 to be tested due to the fact that the angle of the light is not perpendicular incidence, so that the misjudgment of the surface defect position and the element shadow may be caused, and the precision of the optical appearance detection device is further affected.
Specifically, the coaxial beam splitter 5 may perform a function of splitting the initial coaxial beam 113, where the coaxial beam splitter 5 includes an incident transmission surface and an outgoing scattering surface, and the linear beam is incident from one side of the incident transmission surface and scattered on one side of the outgoing scattering surface, so as to perform a certain scattering function on the linear beam, and further make the light incident to the circuit board 3 to be tested diffuse to a certain extent. In the embodiment of the invention, the coaxial light beam 110 is subjected to uniform light to a certain extent, so that the light spot of the coaxial light beam 110 incident to the circuit board 3 to be detected can be increased to a certain extent, and the phenomenon that the coaxial light beam 110 generates a shadow on the circuit board 3 to be detected when a convex element exists on the circuit board 3 to be detected is avoided, thereby influencing the accuracy of imaging detection.
Optionally, as shown with continued reference to fig. 1, 2 and 3, the light source module 1 further comprises an angle integrator 6;
the angle integrator 6 is disposed on the propagation paths of the first angle beam 120 and the second angle beam 130; the angle integrator 6 includes an incident transmissive surface and an exit scattering surface for modulating the first angle beam 120 to form a first angle integrator beam and modulating the second angle beam 130 to form a second angle integrator beam.
The angle beam splitter 6 may perform a beam splitter function on the first angle beam 120 and the second angle beam 130, where the first angle beam 120 is split into a first angle beam by passing through the angle beam splitter 6, and the second angle beam 130 is split into a second angle beam by passing through the angle beam splitter 6. In the embodiment of the invention, the first angle beam 120 and the second angle beam 130 are uniformly illuminated to a certain extent, so that the light spot of the first angle beam 120 and the light spot of the second angle beam 130 incident on the circuit board 3 to be detected can be increased to a certain extent, and the occurrence of black shadow on the circuit board 3 to be detected due to the limitation of the light spot area when the convex element exists on the circuit board 3 to be detected is avoided, thereby affecting the accuracy of imaging detection.
Optionally, the included angle c between the plane of the circuit board to be tested and the main optical axis direction of the coaxial light beam is 70 degrees or more and c is or less than 90 degrees (the included angle is not specifically shown in the figure).
The fact that the included angle c between the plane of the circuit board to be tested and the direction of the main optical axis of the coaxial light beam is 70 degrees or more and less than or equal to 90 degrees means that the included angle between the plane of the circuit board to be tested and the direction of the x axis is 0 degrees to 20 degrees, namely the circuit board to be tested is inclined at a certain angle relative to the imaging lens of the imaging detection module, so that the inner wall of a hole on the circuit board to be tested can be clearly imaged by the imaging detection module, the detection rate of the appearance inspection of the circuit board to be tested is greatly improved, and the false alarm rate is remarkably reduced.
Optionally, as shown in fig. 1, 2 and 3, the light source module 1 further includes a plurality of sets of heat dissipation fins 7;
the heat sink 7 is provided on the side of the coaxial light source 11, the first angle light source 12, and the second angle light source 13, respectively.
The heat dissipation fins 7 are disposed on one side of the coaxial light source 11, the first angle light source 12 and the second angle light source 13, and can respectively dissipate heat of the coaxial light source 11, the first angle light source 12 and the second angle light source 13, so that heat emitted by the coaxial light source 11, the first angle light source 12 and the second angle light source 13 can be more effectively conducted to the outside, and normal operation of the coaxial light source 11, the first angle light source 12 and the second angle light source 13 is ensured.
Optionally, the optical appearance detecting device further includes a control unit (not shown in the figure);
the control unit is respectively in communication connection with the coaxial light source, the first angle light source and the second angle light source and is used for respectively adjusting the brightness of the coaxial light beam, the first angle light beam and the second angle light beam.
The circuit boards to be tested of different types have different appearances, so that the brightness of the light source module can be adjusted through the control unit, the appearance detection of the circuit boards to be tested is targeted, and the circuit boards to be tested of different types have controllable imaging effects.
According to the technical scheme, the coaxial light source, the first angle light source and the second angle light source are arranged in the optical appearance detection device, so that the coaxial light source, the first angle light source and the second angle light source can provide all-directional and multi-angle illumination for the imaging detection module, the accuracy of imaging the front surface of the circuit board to be detected is improved by the coaxial light source, the accuracy of imaging the convex element, the concave element and the inner wall of the circuit board hole to be detected is improved by the first angle light source and the second angle light source, the imaging accuracy of the optical appearance detection device is improved, the defect detection rate of the optical appearance detection device is improved, and the false detection of qualified products and unqualified products of the circuit board is avoided.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. An optical appearance detecting apparatus, comprising:
a light source module and an imaging detection module;
the light source module comprises a coaxial light source, a first angle light source and a second angle light source;
the coaxial light source is used for emitting coaxial light beams to the circuit board to be tested; the first angle light source is used for emitting a first angle light beam to the circuit board to be tested; the second angle light source is used for emitting a second angle light beam to the circuit board to be tested; a first included angle exists between the main optical axis direction of the first angle light beam and the main optical axis direction of the coaxial light beam, a second included angle exists between the main optical axis direction of the second angle light beam and the main optical axis direction of the coaxial light beam, and the first included angle and the second included angle are different;
the imaging detection module is arranged on the propagation paths of the coaxial light beam, the first angle light beam and the second angle light beam after being reflected by the circuit board to be detected and is used for imaging according to the coaxial light beam, the first angle light beam and the second angle light beam reflected by the circuit board to be detected.
2. The optical appearance inspection apparatus of claim 1, further comprising a light exit aperture; the coaxial light beam, the first angle light beam and the second angle light beam are all incident on the circuit board to be tested through the light emergent caliber;
the light source module comprises two groups of first angle light sources; the two groups of first angle light sources are symmetrically arranged on two sides of the central axis of the light emergent caliber;
the light source module comprises two groups of second angle light sources; the two groups of second angle light sources are symmetrically arranged on two sides of the central axis of the light emergent caliber.
3. The optical appearance detecting apparatus according to claim 1, wherein the coaxial light source includes a coaxial light exit unit for exiting an initial coaxial light beam and a transflective unit disposed on a propagation path of the initial coaxial light beam for reflecting the initial coaxial light beam to form a coaxial light beam;
an included angle between the main optical axis direction of the first angle beam and the main optical axis direction of the coaxial beam is less than or equal to 30 degrees;
the included angle between the main optical axis direction of the second angle beam and the main optical axis direction of the coaxial beam is larger than 30 degrees.
4. The optical appearance inspection apparatus of claim 3, wherein the light source module further comprises a coaxial light converging lens;
the coaxial light converging lens is arranged on the propagation path of the initial coaxial light beam and is used for converging the initial coaxial light beam into a linear light beam from a planar light beam.
5. The optical appearance inspection device of claim 4, wherein the imaging inspection module comprises a line scan camera.
6. The optical appearance inspection device of claim 4, wherein the light source module further comprises a coaxial light homogenizer;
the coaxial beam splitter is arranged in the propagation direction of the linear light beam; the coaxial beam splitter comprises an incident transmission surface and an emergent scattering surface and is used for modulating the linear light beam to form a linear beam splitter.
7. The optical appearance inspection apparatus of claim 1, wherein the light source module further comprises an angle integrator;
the angle beam splitter is arranged on the propagation paths of the first angle beam and the second angle beam; the angle light homogenizing lens comprises an incident transmission surface and an emergent scattering surface and is used for modulating the first angle light beam to form a first angle light homogenizing beam and modulating the second angle light beam to form a second angle light homogenizing beam.
8. The optical appearance detecting apparatus according to claim 1, comprising: the included angle c between the plane of the circuit board to be tested and the main optical axis direction of the coaxial light beam is more than or equal to 70 degrees and less than or equal to 90 degrees.
9. The optical appearance inspection apparatus of claim 1, wherein the light source module further comprises a plurality of sets of heat sinks;
the radiating fins are respectively arranged on one side of the coaxial light source, one side of the first angle light source and one side of the second angle light source.
10. The optical appearance detecting apparatus according to claim 1, further comprising a control unit;
the control unit is respectively in communication connection with the coaxial light source, the first angle light source and the second angle light source and is used for respectively adjusting the brightness of the coaxial light beam, the brightness of the first angle light beam and the brightness of the second angle light beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311396935.1A CN117330509A (en) | 2023-10-25 | 2023-10-25 | Optical appearance detection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311396935.1A CN117330509A (en) | 2023-10-25 | 2023-10-25 | Optical appearance detection equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117330509A true CN117330509A (en) | 2024-01-02 |
Family
ID=89275354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311396935.1A Pending CN117330509A (en) | 2023-10-25 | 2023-10-25 | Optical appearance detection equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117330509A (en) |
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2023
- 2023-10-25 CN CN202311396935.1A patent/CN117330509A/en active Pending
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