KR101781418B1 - Illumination apparatus for machine vision - Google Patents

Illumination apparatus for machine vision Download PDF

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Publication number
KR101781418B1
KR101781418B1 KR1020150122864A KR20150122864A KR101781418B1 KR 101781418 B1 KR101781418 B1 KR 101781418B1 KR 1020150122864 A KR1020150122864 A KR 1020150122864A KR 20150122864 A KR20150122864 A KR 20150122864A KR 101781418 B1 KR101781418 B1 KR 101781418B1
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KR
South Korea
Prior art keywords
illumination
optical system
plane
observed
mirror
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KR1020150122864A
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Korean (ko)
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KR20170025839A (en
Inventor
유상일
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한국영상기술(주)
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Priority to KR1020150122864A priority Critical patent/KR101781418B1/en
Publication of KR20170025839A publication Critical patent/KR20170025839A/en
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Publication of KR101781418B1 publication Critical patent/KR101781418B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F21S2/005—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/003—Lens or lenticular sheet or layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/403—Lighting for industrial, commercial, recreational or military use for machines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2101/00—Point-like light sources

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

The present invention relates to a machine-exclusive illumination apparatus capable of simultaneously improving the readability of a machine vision on an upper surface and a side surface of an observation object while minimizing the influence of noise due to diffuse reflection and spatial restriction of machine vision. And a first illumination system for providing illumination to the first optical system, characterized in that the illumination system includes a first illumination optical system that is located in the same direction as the first optical system and acquires a side image of the observation object 2 optical system; A mirror positioned on the same plane as the second optical system and mounted on an optical path between the second optical system and a side surface of the object to be observed so as to obtain a side image of the object; And a second optical system located on a plane orthogonal to the plane on which the mirror is located and coplanar with the mirror, the second optical system being located at a position lower than the first illumination system, And an illumination system.

Description

[0001] Illumination apparatus for machine vision [0002]

The present invention relates to a machine-specific illumination apparatus, and more particularly, to a machine vision illumination apparatus capable of simultaneously improving the readability of a machine vision on an upper surface and a side surface of an observation target while minimizing the influence of noise caused by diffuse reflection ≪ / RTI >

In machine vision devices, illumination is a very important factor that enables vision cameras to see signs such as foreign objects, textures or patterns on parts or surfaces, and the inspection and reading performance of machine vision devices depend on the performance of the illumination.

FIG. 1 schematically shows a machine vision apparatus for testing a camera module of a portable terminal according to the prior art. As shown in FIG. 1, a machine vision is visually observed through an inspection camera 10 and an inspection lens 20, A plurality of lights such as a coaxial illumination 30, a first ring illumination 40, and a second ring illumination 50 are provided to observe foreign objects or scratches on the upper surface.

For convenience of explanation, a camera module as an example of the observation object 60 is schematically shown in Fig. 2, a plurality of lenses 61 and a lens barrel 62 covering the lenses are exposed on the upper surface of the camera module, and a lens 61 and a lens barrel 62 are mounted on a VCM 63 A PCB 70 (Printed Circuit Board) and a connector 80 for driving and controlling the camera module, and the like are provided at one side of the lower module.

As described above, machine vision is equipped with a number of lights, such as coaxial illumination 30, top ring illumination 40, and side ring illumination 50, to enhance inspection and reading performance. 2, the coaxial illumination 30 is used to detect a lens defect (foreign matter on the lens surface, scratches, stains, etc.) which is opaque and has a color difference when the surface image of the lens 61 on the upper surface of the camera module is taken, And the upper surface ring illumination 40 is used for inspecting the surface of the lens barrel 62 on the upper surface of the camera module and there is a lens barrel defect (a fingerprint of the lens barrel surface, And the side ring illumination 50 is used when the side image of the surface of the lens barrel 62 on the top surface of the camera module is taken in a transparent state or when there is a difference in height or depth from the surface (Lens fingerprints, deep scratches, foreign matter, breakage, and the like) defects of the lens 61 and the lens barrel 62.

2, product information 65 such as a product-related serial number is recorded in a 2D form on the side of the housing 64 in the form of a data matrix. Therefore, the machine vision apparatus needs to simultaneously acquire an image of not only the upper surface but also the side surface of the observation target 60. To this end, a separate optical system and illumination system for providing illumination to the side surface of the observation target 60 do.

However, because machine vision requires a large number of lights to be applied without interference, such as coaxial illumination 30, top ring illumination 40, and side ring illumination 50, to enhance inspection and reading performance, The size of the illumination is relatively large compared to the distance between the illumination and the observation target 60. [

Therefore, in addition to the first optical system and the illumination system used for acquiring the image of the top surface of the observation target 60, the second optical system and the illumination system necessary for acquiring the lateral image for reading the product information recorded on the side of the observation target 60 There is a problem that a space for attaching the optical system and the illumination system can not be secured sufficiently.

Further, when the second light is illuminated to read the product information 65 recorded on the side of the observation target 60, the PCB 7, which is attached at an angle of 90 ° around the product information 65, Reflected light that is irregularly reflected from various components such as the connector 80 is incident on the second optical system, there is a problem that an image including noise is acquired, which deteriorates readability of the machine vision.

KR 10-1114222 B1 (2012.02.02.) KR 10-2004-0006059 A (2004.01.24.)

SUMMARY OF THE INVENTION An object of the present invention to solve the above-mentioned problems is to provide an apparatus and method for acquiring a top image of an observation object, a second optical system for acquiring a side image of the observation object, And a lighting device.

Another object of the present invention is to provide a method and an apparatus for reflecting reflected light irregularly reflected from peripheral parts of an object to be observed on a plane that is 90 ° different from the second optical system when the second illumination is read to read the product information recorded on the side of the object to be observed Thereby minimizing the influence of noise due to reflected light.

In order to achieve the above object, a machine-exclusive illumination apparatus according to the present invention is a machine-exclusive illumination apparatus having a first optical system for acquiring an image of a top surface of an object to be observed and a first illumination system for providing illumination to the first optical system A second optical system positioned in the same direction as the first optical system and acquiring a side image of the object to be observed; A mirror positioned on the same plane as the second optical system and mounted on an optical path between the second optical system and a side surface of the object to be observed so as to obtain a side image of the object; And a second illumination system located on a plane orthogonal to a plane on which the second optical system and the mirror are located and providing illumination to a side surface of the observation target at a position lower than the first illumination system .

In this case, the second illuminating system of the machine-exclusive illuminating device according to the present invention includes an LED and a collimation lens for converting the light emitted from the LED into parallel light, .

The second illuminating system of the machine-dedicated illuminating device according to the present invention is characterized in that, when illuminating a side surface of the observation target, reflected light reflected from peripheral objects of the observation target and the observation target is reflected by the second optical system And is positioned so as to be reflected by an orthogonal plane that is 90 deg.

Further, the second illumination system of the machine-dedicated illumination apparatus according to the present invention is characterized in that, when the second optical system is disposed in the xy plane, it is arranged in the xz plane so as to be located in different planes orthogonal to the second optical system and the mirror .

As described above, the present invention has an effect of minimizing a space for attaching the second optical system and the illumination system necessary for acquiring the image of the top surface of the observation target and obtaining the side image of the observation target.

Further, according to the present invention, when a second illumination is read out to read product information recorded on the side of an observation object, reflected light that is refracted from peripheral components of the observation target is reflected on a plane that is 90 degrees different from the second optical system, It is possible to improve the readability of the machine vision by minimizing the influence of the noise caused by the noise.

Brief Description of Drawings Fig. 1 is a schematic view of a machine vision apparatus for testing a camera module of a portable terminal according to the prior art;
FIG. 2 is a perspective view of a camera module for a mobile terminal, which is an example of an observation target observed by a machine-dedicated illumination device according to the present invention,
Fig. 3 is a side view schematically showing a machine-exclusive lighting apparatus according to the present invention, Fig.
FIG. 4 is a top view for explaining a second illumination system of the machine-specific illumination apparatus according to the present invention shown in FIG. 3,
Fig. 5 is a perspective view specifically showing a machine-exclusive lighting apparatus according to the present invention shown in Fig. 3,
6 is a view schematically showing a second illumination system used in a machine-dedicated illumination apparatus according to the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a machine-specific illumination apparatus according to the present invention will be described in detail with reference to the drawings. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS The same features of the Figures represent the same reference symbols wherever possible. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, the attached drawings are exaggerated or simplified in order to facilitate understanding and clarification of the structure and operation of the technology, and it is to be understood that each component does not exactly coincide with the actual size.

The terms first, second, etc. may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In addition, when an element includes a constituent element, it means that the element can include other constituents, not excluding the other constituent element unless specifically stated otherwise, and the meaning of the term " Means a unit or module type that processes at least one function or operation, and may be implemented as hardware, software, or a combination of hardware and software.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It is to be understood that the same terms as those defined in the commonly used terms are defined in consideration of the functions of the present invention and are to be construed in accordance with the technical idea of the present invention and the meaning commonly understood or commonly recognized in the technical field And is not to be construed as an ideal or overly formal sense unless expressly defined to the contrary.

4 is a top view for explaining a second illumination system of the machine-specific illumination apparatus according to the present invention in Fig. 3, and Fig. 5 is a cross- 3 is a perspective view specifically showing a machine-exclusive lighting apparatus according to the present invention.

3 to 5, a machine-specific illumination apparatus according to the present invention includes a mirror 130 (Mirror) inserted into an optical path (OP) of a second optical system 110, 120, Even if the second optical systems 110 and 120 are positioned in the same direction as the first and second optical systems 10 and 20, the space can be minimized by making the side of the observation object visible.

Particularly, in the machine vision according to the present invention, since the size of the object to be observed is small within 5 mm * 5 mm, the influence of the diffused reflection light on peripheral parts (PCB, connector, tray, etc.) positioned close to the recording position of the product information 65 Very large. Therefore, the machine-dedicated illumination apparatus according to the present invention can be realized by placing the second illumination system 140 so that the path of the second illumination light (IL) is reflected by an orthogonal plane that is 90 DEG out of phase with the second optical system 110, 120, The reflected light RL of the second illumination is prevented from being reflected on the same plane as the second optical systems 110 and 120 so that the influence of noise due to the reflected light RL can be minimized.

Referring to FIG. 4, the path of the second illumination light IL may include a second illumination system 140 disposed in the xy plane and a second optical system 110 and 120 orthogonal to the mirror 130 Orthogonal), the reflected light and the scattered light from the observation target 60 or surrounding components are not incident on the second optical system 110, 120, thereby increasing the readability of the acquired image.

In order for the side illumination to exhibit its function, the distance from the observation target 60 to the illumination must be short. Therefore, the size of the second illumination system 140 must be minimized, and the intensity of the light intensity must be strong. It is necessary to minimize the influence of the noise light generated from the observation object 60 and surrounding components on the second optical systems 110 and 120 located on the plane.

The normal small point light source not only has the brightness per unit area of the light suddenly lowered since the light spreads (brightness in inverse proportion to the square of the distance), but also the orthogonal condition with respect to the second optical systems 110 and 120 The effect of reducing the noise is deteriorated.

Therefore, as shown in FIG. 6, by converting the emitted light of the point light source 142 into a collimated beam using a collimation lens 143, the brightness per unit area is increased and the distance from the sample is increased And it is possible to minimize the introduction of the noise light into the second optical systems 110 and 120 orthogonal to each other by the parallel light. 6 is a view schematically showing a second illumination system used in a machine dedicated illumination apparatus according to the present invention in which an LED 142 mounted on a PCB 141 and a collimation lens 143 are arranged in a housing 144 And an inner cross-section of the second illumination system 140 is shown.

As described above, the machine-dedicated illumination apparatus according to the present invention can minimize the space for attaching the second optical system and the illumination system necessary for acquiring the image of the top surface of the object to be observed and acquiring the side image of the object to be observed .

The machine-dedicated illumination apparatus according to the present invention further comprises a second optical system for reflecting the refracted light refracted from peripheral parts of the object to be observed when the second light is read in order to read the product information recorded on the side of the object, So that the influence of the noise due to the reflected light can be minimized.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (4)

A first optical system including at least an inspection camera 10 and an inspection lens 20 to acquire an image of a top surface of an object to be observed and a first optical system including a coaxial illumination 30, ) And a second ring illumination (50), characterized by comprising:
A second optical system (110, 120) located in the same direction as the first optical system and acquiring a side image of the object to be observed;
A mirror positioned on the same plane as the second optical system and mounted on an optical path between the second optical system and a side surface of the observation object to obtain a side image of the observation target; And
And a second illumination system (140) which is located on a plane orthogonal to a plane where the second optical system and the mirror are located, and provides illumination to a side surface of the observation target at a position lower than the first illumination system Lighting device.
2. The illumination system according to claim 1,
And a collimation lens for converting the light emitted from the LED into a parallel light.
2. The illumination system according to claim 1,
Wherein the reflected light reflected from the object to be observed and peripheral components of the object to be observed is positioned so as to be reflected by an orthogonal plane that is 90 DEG different from the second optical system when illuminating the side of the object to be observed. Device.

2. The illumination system according to claim 1,
And when the second optical system is disposed in the xy plane, the second optical system is disposed in the xz plane so as to be located in different planes orthogonal to the second optical system and the mirror.
KR1020150122864A 2015-08-31 2015-08-31 Illumination apparatus for machine vision KR101781418B1 (en)

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KR101781418B1 true KR101781418B1 (en) 2017-09-25

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11549662B2 (en) 2021-04-14 2023-01-10 Samsung Display Co., Ltd. Illumination apparatus and optical inspection apparatus including the same
KR20230022725A (en) 2021-08-09 2023-02-16 충북대학교 산학협력단 Lighting module inspection device for machine vision and light module inspection method for machine vision using thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040006059A (en) 2002-07-09 2004-01-24 주식회사옌트 Illumination unit used in apparatus for inspecting surface-mounted chip and chip inspection method using the illumination unit
KR101114222B1 (en) 2009-10-12 2012-03-05 주식회사 엔씨비네트웍스 Multi illumination system for vision inspection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11549662B2 (en) 2021-04-14 2023-01-10 Samsung Display Co., Ltd. Illumination apparatus and optical inspection apparatus including the same
KR20230022725A (en) 2021-08-09 2023-02-16 충북대학교 산학협력단 Lighting module inspection device for machine vision and light module inspection method for machine vision using thereof

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