CN101382257B - Illuminating apparatus for detecting cylinder defect - Google Patents
Illuminating apparatus for detecting cylinder defect Download PDFInfo
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- CN101382257B CN101382257B CN2008102011147A CN200810201114A CN101382257B CN 101382257 B CN101382257 B CN 101382257B CN 2008102011147 A CN2008102011147 A CN 2008102011147A CN 200810201114 A CN200810201114 A CN 200810201114A CN 101382257 B CN101382257 B CN 101382257B
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Abstract
The invention relates to an illumination device used for detecting defects of cylindrical surfaces; the illumination device is characterized by comprising a hollow cylindrical body (6) with the internal circumferential wall having a light source (4), a ring-shaped prism (1) which is coaxially arranged in the cylindrical body (6); furthermore, the cross-section of the ring-shaped prism is a right angled triangle, wherein, the external circumferential wall and the bottom edge are right angle edges and the internal circumferential wall is an inclined edge; the inclined surface of the ring-shaped prism is plated by half-transmission and half-reflection optical film. Compared with the prior art, the illumination device has the advantages that by the ring-shaped prism with the right angle triangular cross-section coaxially arranged at the internal side of the hollow cylindrical body and the optical film of half-transmission and half-reflection arranged on the inclined surface of the ring-shaped prism, the reflecting light direction of the cylinder to be detected is changed, the illumination advantage of the cylindrical light source is remained, the gaining of no-defect ring-shaped image is possible simultaneously; furthermore, the illumination device can provide the surface image of the cylinder to be detected ranging from 0 to 360 DEG for the image gaining device.
Description
Technical field
The present invention relates to a kind of lighting device, relate to a kind of lighting device that is used to detect smooth face of cylinder defectives such as bearing, stainless steel tube more specifically.
Background technology
The vision illuminator that is adopted in the defect inspection process to the cylinder surface, if employing annular light source, then can only be for cylinder provide uniform illumination light, and annular light source makes that to the encirclement formula structure of cylinder the surface characteristics of cylinder can't be obtained by vision system; If shine cylinder with planar light source, because the minute surface principle of reflection, the cylinder that obtains will have the bright line that is difficult to eliminate.
Existing cylinder defect detects, and generally adopts columnar light source, and this columnar light source as shown in Figure 5, is covered with shiner 2 ' at semicolumn 1 ' inwall originally as semicolumn vault construction (bowl shaped structure is also arranged).During detection, tested cylinder 3 ' is placed on the coaxial position of columnar light source, for tested cylinder, just can obtain even illumination light like this near 180 °.The columnar light source of this structure leaves linear opening 11 ' on the top of semicolumn, and image-taking system can photograph the measured circle cylinder by this opening.The defective of the cylinder light source of this structure is: the semicolumn top of columnar light source is necessary for image-taking system and leaves opening, so that collection image, and the disappearance of aperture position shiner (as the LED lamp) makes that having blackening when being radiated at the measured circle cylinder occurs, and these illumination defectives will influence follow-up picture recognition.In addition, when using the cylinder light source of this structure that cylinder is carried out defects detection, can only obtain the image of hemicycle cylinder, and away from the cylinder of linear opening because far away and angled with camera lens from camera lens, shooting results also will influence follow-up picture recognition.
At present, also have part vision illuminator to adopt the cylinder prism that the defective on cylinder surface is detected, this cylinder prism converges incident light, when coinciding with the focus of cylinder prism, tested cylindrical axle center just can obtain the field of illumination on the measured circle cylinder of being radiated at of a relative broad, the shortcoming of this type of cylinder illumination is that the field of illumination improvement is little, and tested cylindrical thickness scope is subjected to the restriction of cylinder prism focal length, so the suitable measurement category of cylinder prism is wideless.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of lighting device that is used for the test column planar defect that measured circle damaged surface image on 0 °～360 ° directions can be provided for image acquiring device at above-mentioned prior art.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: this is used for the lighting device of test column planar defect, it is characterized in that: include
One hollow circle tube body, the internal perisporium of this cylinder body is provided with light source;
One annular prism, coaxial being arranged in the described cylinder body, described light source is arranged between the internal perisporium and described annular prism of described cylinder body, and cross section that should the annular prism is a right angled triangle, wherein periphery wall and base are right-angle side, internal perisporium is a hypotenuse, simultaneously, is coated with inverse ratio on the inclined-plane of this annular prism and is the optical thin film of 50% half-transmitting and half-reflecting.
Like this, when tested cylindrical surface is detected, tested cylindrical central shaft is overlapped with the central shaft of hollow circle tube body as far as possible, the light of light source enters annular prism, because the half-transmitting and half-reflecting optical thin film on the inclined-plane of annular prism carries out transmission with light with 50% ratio, the measured circle cylinder is subjected to the irradiation of this part annular horizontal light, the lighting condition on the face of cylinder on 360 ° of azimuths is identical, brightness is even everywhere, the horizontal light of annular arrives the measured circle cylinder after the reflection of measured circle damaged surface, return by former road, after these horizontal light arrived the inclined-plane of annular prism, the half-transmitting and half-reflecting optical thin film on this inclined-plane was with the light reflection of these levels.According to the reflection principle, through the inclined-plane light reflected towards the hollow circle tube body shaft to external exposure.This moment is if place the cylindrical picture that image acquiring device just can photograph 360 ° of measured circle cylinders in the place of the axial upper edge of hollow circle tube body light reflected irradiation, and this image is through the cylindroid light illumination, and brightness evenly is highly suitable for image recognition.
The cross section of above-mentioned annular prism is that isosceles right triangle is good, like this, by the inclined-plane light reflected then can along with the direction of hollow circle tube body axially parallel to external exposure.
For the more uniform measured circle damaged surface that shines of the luminous energy that light emitted can be come out, also be coaxially arranged with annular diffusion sheet between described cylinder body and the described annular prism, the light that light emitted is come out can form uniform ring illumination light through behind the diffusion sheet.
In order to make the illumination light that is radiated at the measured circle damaged surface have polarizability, also be coaxially arranged with the annular polarization sheet between described annular diffusion sheet and the described annular prism, the height of described annular prism is identical with the height of described annular polarization sheet.
As improvement, described hollow circle tube body is provided with dust-proof window in the upper surface relative with the inclined-plane of described annular prism.
Obtain the image of measured circle damaged surface for the ease of image acquiring device, described dust-proof window is provided with detection window.
Improve again, between the internal perisporium of the back side of described light source and described hollow circle tube body heat sink material be installed, heat sink material the heat dispersion that the cylindroid light source can be provided, the life-span of increase cylindroid light source be set.
At last, described light source can be an annular light source, also can be the discrete light source that a plurality of LED constitute, perhaps the spot light that is provided with at interval; As preferred version, described light source is made up of the LED lamp around the internal perisporium that is arranged on described hollow circle tube body.
Compared with prior art, the invention has the advantages that: by at the inboard coaxial annular prism that cross section is a right angled triangle that is provided with of hollow circle tube body, making annular prism periphery wall and base is right-angle side, internal perisporium is a hypotenuse, simultaneously, the optical thin film of plating half-transmitting and half-reflecting on the inclined-plane of annular prism, thus changed tested cylindrical reverberation direction, the illumination advantage that had both kept columnar light source makes obtaining of zero defect annular image become possibility again; In addition, the present invention can provide 0 °～360 ° tested cylindrical surface image for image acquiring device.
Description of drawings
Fig. 1 is an embodiment of the invention structural representation;
Fig. 2 is the stereochemical structure exploded view of the embodiment of the invention;
Fig. 3 is the installation diagram of the embodiment of the invention;
Fig. 4 is the perspective view of annular prism in the embodiment of the invention;
Fig. 5 is the structural representation of columnar light source in the prior art.
The specific embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
The lighting device that is used for the test column planar defect shown in Fig. 1～4, comprise hollow circle tube body 6, coaxial annular prism 1, annular polarization sheet 2, annular diffusion sheet 3, light source 4 and heat sink material 5, the dust-proof window 7 that is arranged in the cylinder body 6, in the present embodiment, hollow circle tube body 6 is made up of lower casing 61 and last shell 62.Wherein, light source 4 is arranged on the internal perisporium of cylinder body 6, and heat sink material 5 is installed between the internal perisporium of the back side of light source 4 and hollow circle tube body 6, can improve the heat dispersion of cylindroid light source 4, increases the life-span of light source 4.Annular diffusion sheet 3 is coaxial be arranged on cylinder body with 6 with annular prism 1 between, the light of light source 4 is through the back uniform ring illumination light of formation of annular diffusion sheet 3.2 of annular polarization sheets are arranged between annular diffusion sheet 3 and the annular prism 1 coaxially, make illuminating ray have polarizability.The outside diameter of annular prism 1 and the equal diameters of annular polarization sheet 2, annular prism 1 is consistent with the structure height of annular polarization sheet 2.The cross section of annular prism 1 is an isosceles right triangle, wherein periphery wall and base are right-angle side, and internal perisporium is a hypotenuse, simultaneously, being coated with inverse ratio on the inclined-plane of this annular prism and being the optical thin film of 50% half-transmitting and half-reflecting, fits in the inboard of the periphery wall of annular prism 1 and annular polarization sheet 2.Dust-proof window 7 is arranged on last, the relative upper surface, annular prism 1 inclined-plane of hollow circle tube body 6, has detection window 9 on the dust-proof window, and there is the screwed hole 8 of installation on the surface of shell.
Light source 4 can be an annular light source, also can be the discrete light source that a plurality of LED constitute, perhaps the spot light that is provided with at interval; In the present embodiment, light source 4 is made up of the LED lamp around the internal perisporium that is arranged on described hollow circle tube body.
The device horizontal positioned that present embodiment can be provided during work is placed on the center of cylinder body 6 to any one end face of measured circle cylinder, and tested cylindrical central shaft overlaps with the central shaft of cylinder body 6 as far as possible.The light of light source 4 passes through annular polarization sheet 2 through the even annular illuminating ray that annular diffusion sheet 3 backs form, and enters annular prism 1.With 50% ratio transmission, the measured circle cylinder is subjected to the irradiation of this part annular horizontal light to half-transmitting and half-reflecting optical thin film on annular prism 1 inclined-plane with light, and the lighting condition on the face of cylinder on 360 ° of azimuths is identical, and brightness is even everywhere.The horizontal light of annular arrives the measured circle cylinder after the reflection of measured circle damaged surface is returned by former road.These horizontal light arrive the light reflection of the half-transmitting and half-reflecting optical thin film on this inclined-plane behind annular prism 1 inclined-plane with these levels.According to the principle of reflection, become vertically by horizontal direction through 45 ° of inclined-plane light reflected and to make progress.This moment is if place the cylindrical picture that image-taking system just can photograph 0 ° to 360 ° of measured circle cylinder directly over device, and this image process cylindroid light illumination, and brightness evenly is highly suitable for image recognition.
Claims (8)
1. a lighting device that is used for the test column planar defect is characterized in that: include
One hollow circle tube body (6), the internal perisporium of this cylinder body is provided with light source (4);
One annular prism (1), coaxial being arranged in the described cylinder body (6), described light source (4) is arranged between the internal perisporium and described annular prism (1) of described cylinder body (6), and cross section that should annular prism (1) is a right angled triangle, wherein periphery wall and base are right-angle side, internal perisporium is a hypotenuse, simultaneously, is coated with inverse ratio on the inclined-plane of this annular prism (1) and is the optical thin film of 50% half-transmitting and half-reflecting.
2. the lighting device that is used for the test column planar defect according to claim 1 is characterized in that: the cross section of described annular prism (1) is an isosceles right triangle.
3. the lighting device that is used for the test column planar defect according to claim 1 is characterized in that: also be coaxially arranged with annular diffusion sheet (3) between described cylinder body (6) and the described annular prism (1).
4. the lighting device that is used for the test column planar defect according to claim 3, it is characterized in that: also be coaxially arranged with annular polarization sheet (2) between described annular diffusion sheet (3) and the described annular prism (1), the height of described annular prism (1) is identical with the height of described annular polarization sheet (2).
5. the lighting device that is used for the test column planar defect according to claim 1 is characterized in that: described hollow circle tube body (6) is provided with dust-proof window (7) in the upper surface relative with the inclined-plane of described annular prism (1).
6. the lighting device that is used for the test column planar defect according to claim 5 is characterized in that: described dust-proof window (7) is provided with detection window (9).
7. according to the described lighting device that is used for the test column planar defect of any claim in the claim 1～6, it is characterized in that: between the internal perisporium of the back side of described light source (4) and described hollow circle tube body (6) heat sink material (5) is installed.
8. according to the described lighting device that is used for the test column planar defect of any claim in the claim 1～6, it is characterized in that: described light source (4) is by forming around the LED lamp on the internal perisporium that is arranged on described hollow circle tube body (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102011147A CN101382257B (en) | 2008-10-14 | 2008-10-14 | Illuminating apparatus for detecting cylinder defect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102011147A CN101382257B (en) | 2008-10-14 | 2008-10-14 | Illuminating apparatus for detecting cylinder defect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101382257A CN101382257A (en) | 2009-03-11 |
| CN101382257B true CN101382257B (en) | 2010-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008102011147A Expired - Fee Related CN101382257B (en) | 2008-10-14 | 2008-10-14 | Illuminating apparatus for detecting cylinder defect |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102374419A (en) * | 2010-08-20 | 2012-03-14 | 光宝科技股份有限公司 | Led lamp |
| CN102748638B (en) * | 2012-07-25 | 2014-04-02 | 电子科技大学 | LED lighting device for realizing uniform light receiving on surface of cylinder and mounting method thereof |
| CN102854201A (en) * | 2012-09-18 | 2013-01-02 | 上海创波光电科技有限公司 | Device for surface detection of capsules |
| US9291877B2 (en) * | 2012-11-15 | 2016-03-22 | Og Technologies, Inc. | Method and apparatus for uniformly focused ring light |
| CN103076337A (en) * | 2012-12-28 | 2013-05-01 | 罗炳军 | Multiple light source detection device |
| CN104677913A (en) * | 2015-02-07 | 2015-06-03 | 长沙市伟视创图像技术有限公司 | Detonator defect automatic optic inspection machine |
| CN104849288B (en) * | 2015-05-11 | 2017-12-08 | 华中科技大学 | A kind of detecting system of the cylindrical face surface microscratch defect based on optical fiber image transmission |
| TWI644096B (en) * | 2017-12-05 | 2018-12-11 | 國立臺北科技大學 | Lightsouce device with slit strucure for defect inspeciton and system for defect inspection using the same |
| CN112924455A (en) * | 2019-12-05 | 2021-06-08 | 骏曦股份有限公司 | Detection system |
| CN111123686A (en) * | 2020-01-09 | 2020-05-08 | 广州市心鉴智控科技有限公司 | Light-transmitting cylindrical lens detection device and detection method thereof |
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2008
- 2008-10-14 CN CN2008102011147A patent/CN101382257B/en not_active Expired - Fee Related
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| CN101382257A (en) | 2009-03-11 |
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