CN109814225B - Industrial detection cone optical lens and imaging detection method thereof - Google Patents
Industrial detection cone optical lens and imaging detection method thereof Download PDFInfo
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Abstract
The invention relates to an industrial detection cone optical lens, which comprises a front lens group, a middle lens group in threaded connection with the front lens group and a rear lens group in movable connection with the middle lens group through a focusing ring, wherein the front lens group comprises a plurality of front convex lenses; the middle lens group comprises a plurality of middle lenses, the rear lens group comprises a plurality of rear lenses, and the focusing ring is rotated to drive the rear lens group to move forwards and backwards so as to change the distance between the middle lenses and the rear lenses and realize focusing. The invention also relates to an imaging detection method of the cone optical lens. The industrial detection cone optical lens has the advantages of simple structural design, few lens parts, convenient focusing and accurate focusing, small volume and convenient carrying; the imaging detection method of the conical light mirror detects a light beam product through the fact that the light beam is arranged right in front of the conical light mirror, and detection is achieved by adopting the conical light mirror to absorb light ray imaging of the light beam, so that the occupied space of a test part of the detection method is small, focusing is convenient, and the outline of an acquired image is clear.
Description
Technical Field
The invention relates to the technical field of machine vision lenses, in particular to an industrial detection cone optical lens and an imaging detection method of the cone optical lens.
Background
Along with the development of science and technology, the industrial revolution no longer stays in the simple industrialized development level, and the machine vision can replace the traditional manual detection method, so that the efficiency and effect of industrial manufacturing are greatly improved, the product quality of the market is greatly improved, and the industrial lens is taken as an important component of the machine vision and directly influences the overall performance of the system.
When the conventional industrial lens is used for spot detection of light beam projection, the working distance of projection is required to be large, the imaging view angle is small, the focusing distance of the lens is long, focusing is difficult, imaging of the lens of the industrial camera and a test product thereof which are required to be moved for many times is possibly distorted due to the influence of the periphery of an optical film and the view, imaging is unclear and quality is poor, and the requirement of clear imaging of the industrial lens in current production cannot be met.
The existing cone optical lens is positioned between the lock aperture and the objective table and consists of a group of lenses; the polarized light from the lower polarizer is converged into a cone polarized light beam through the cone lens, and the cone lens lifting screw is arranged on the side part of the polarized light beam so as to adjust the distance between the cone lens and the objective table.
As shown in fig. 6 and 7, the existing lens imaging principle is: the light of the light beam irradiates the light spot virtual image formed by the optical film plate and is refracted to the lens to form a mirror image to form a real image, the imaged image is not clear, and by adopting the detection method, the light beam, the optical lens and the lens are sequentially arranged from left to right, so that the occupied space of the light beam, the optical lens and the lens is large, the detection cost is high, the emission angles of different light beam angles enable the imaging intervals of the light spot virtual image to be different, and products with different light beam angles need to be readjusted to the position of the testing part, thereby causing trouble to a tester.
Therefore, it is desirable to provide an industrial inspection cone mirror to solve the deficiencies of the prior art.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an industrial detection cone optical lens.
The technical scheme of the invention is as follows:
An industrial inspection cone optical lens comprising:
the front lens group comprises a plurality of front convex lenses;
the middle lens group comprises a plurality of middle convex lenses;
The rear lens group comprises a plurality of rear convex lenses;
The front lens group is in threaded fit connection with the middle lens group, the middle lens group and the rear lens group are respectively in threaded connection with a focusing ring to connect the middle lens group and the rear lens group together, and the focusing ring is rotated to drive the rear lens group to move back and forth so as to change the distance between the middle convex lens and the rear convex lens to realize focusing.
Preferably, the front lens group comprises a front base with an inner cavity, an inner thread is arranged on the inner wall surface in the inner cavity of the front base, a first outer thread is arranged on the middle base corresponding to the middle lens group, and the front lens group is fixedly connected with the middle lens group by matching threaded connection of the inner thread and the first outer thread.
Further, a plurality of first steps are formed on the inner wall surface in the inner cavity of the front base, and each front convex lens is arranged corresponding to each first step.
Preferably, the front base is further provided with a mounting connection plate in a protruding mode, and the mounting connection plate is provided with a plurality of mounting connection holes.
Preferably, the front base is provided with a first through hole, and the rear base is provided with a second through hole correspondingly, and the first through hole and the second through hole are used for transmitting light.
Preferably, the middle lens group comprises a middle base with an inner cavity, a plurality of second steps are also arranged on the wall surface of the inner cavity of the middle base, and each convex lens is arranged corresponding to each second step.
Preferably, a second external thread is further arranged on the outer wall surface of the cylinder at the upper end of the middle base, and is in threaded connection with a locking ring, and the locking ring is used for limiting the moving stroke of the focusing ring.
Preferably, the rear lens group comprises a rear base with an inner cavity, a plurality of third steps are arranged on the inner cavity of the rear base, and each rear convex lens is fixedly arranged on each third step.
Further, a third external thread is further arranged on the outer wall surface of the cylinder at the lower end of the rear base, the lower end of the focusing ring is in threaded fit connection with the second external thread, the upper end of the focusing ring is in threaded fit connection with the third external thread, the middle base is connected with the rear base, and then the middle lens group is movably connected with the rear lens group.
Preferably, the outer wall surface of the rear base is further provided with an arc-shaped clamping column in a protruding mode, and the arc-shaped clamping column is fixedly connected with a camera.
Based on the industrial detection cone optical lens, the invention also provides an imaging detection method of the cone optical lens, which comprises the following steps:
s1: firstly, installing the industrial detection cone optical lens on a CCD camera;
S2: then placing a product to be detected on one side of the industrial detection cone optical lens, wherein the distance between the product to be detected and the industrial detection cone optical lens is L3, L3 is the working distance of the lens, and the working distance of the lens is 3-50 mm;
S3: starting the CCD camera, and shooting a light beam emitted by a product to be detected by a front convex lens of the industrial detection cone optical lens to simulate a light spot to form a light spot virtual image by a distance required by imaging;
S4: and the convex lens and the rear convex lens of the industrial detection cone optical lens absorb facula virtual images to be converged into real images, and the real images are mapped onto the CCD camera, so that the acquisition of the images of the products to be detected and the observation and analysis of the images of the products to be detected are realized.
Preferably, in the step S2, the dimension of L3 is more preferably 10mm, and the dimension of L3 is most preferably 5mm. Wherein the product to be detected is a product with a dispersed light beam.
Preferably, in the step S3, the emission angle R of the front convex lens of the industrial inspection cone lens capable of capturing the light beam is 0 ° to 160 °.
Preferably, in the step S4, a distance between the position of the virtual spot image and the industrial inspection cone mirror is L2, and a size of L2 is 0.2m to 10m.
The beneficial effects of the invention are as follows: compared with the prior art, the industrial detection cone optical lens has the advantages of simple structural design, few lens parts, convenient focusing and accurate focusing of the lens, small volume and convenient carrying; the imaging detection method of the conical light mirror is adopted to detect the light beam product, the component of the optical film is reduced, the detection cost is reduced, the light beam is arranged right in front of the conical light mirror, and the detection is realized by adopting the conical light mirror to absorb the light ray imaging of the light beam, so that the occupied space of the test component of the detection method is small, the focusing is convenient, and the profile of the acquired image is clear.
Drawings
FIG. 1 is a schematic diagram of the industrial inspection cone mirror according to the present invention.
FIG. 2 is a schematic cross-sectional view of an industrial inspection cone mirror according to the present invention.
Fig. 3 is a schematic exploded view of the industrial inspection cone mirror according to the present invention.
FIG. 4 is a schematic diagram of industrial inspection cone optical lens inspection imaging according to the present invention.
FIG. 5 is a schematic view of an industrial inspection cone optical lens inspection image according to the present invention.
Fig. 6 is a schematic diagram of prior art lens imaging detection.
Fig. 7 is a schematic diagram of a prior art lens imaging image.
Detailed Description
In order to make the technical scheme and technical effects of the invention more clear, the invention is further described below with reference to specific embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 3, the industrial inspection axicon of the present invention includes a front lens assembly 100, a middle lens assembly 200 and a rear lens assembly 300, wherein the front lens assembly 100 is connected with one end of the middle lens assembly 200 in a matching manner, and the middle lens assembly 200 at the other end is connected with the rear lens assembly 300 in a matching manner. In this embodiment, the front lens group 100 is screwed with the middle lens group 200 to fixedly connect the front lens group 100 with the middle lens group 200, and the middle lens group 200 and the rear lens group 300 are screwed with a focusing ring 400 to connect the middle lens group 200 with the rear lens group 300.
Referring to fig. 2, the front lens assembly 100 includes a front base 110 having an inner cavity, and a front lens assembly 120 disposed in the inner cavity of the front base 110, wherein a plurality of first steps 111 are formed on an inner wall surface of the inner cavity of the front base 110, and a number of front convex lenses 121 corresponding to the front lens assembly 120 and matched with the first steps 111 are included. Specifically, one end of the front base 110 is provided with three annular first steps 111, and the diameters of the three first steps 111 from bottom to top are gradually increased with reference to the direction of the view of fig. 2, and each first step 111 is fixedly provided with the front convex lens 121. A first through hole 130 is formed at one end of the front base 110, an internal thread 112 is formed on the front base 110 at the other end, and a first external thread 211 is formed on the middle base corresponding to the middle lens group 200; the first external thread 122 is in threaded engagement with the internal thread 112 to fixedly connect the front lens assembly 100 with the middle lens assembly 200. In this embodiment, the front lens group 100 further protrudes with a mounting connection board 140, and the mounting connection board 140 is provided with a plurality of mounting connection holes 141.
Referring to fig. 2, the middle lens assembly 200 includes a middle base 210 having an inner cavity and a middle lens assembly 220 disposed in the inner cavity of the middle base 210, and a plurality of second steps 212 are also formed on an inner wall surface of the inner cavity of the middle base 210, and the middle lens assembly 220 includes a number of convex lenses 221 matching the number of the second steps 212. Specifically, with reference to the direction of view of fig. 2, the middle base 210 is provided with two annular second steps 212 from top to bottom. The outer wall surface of the cylinder at the upper end of the middle base 210 is also provided with a second external thread 213, and the second external thread 213 is connected with a locking ring 230 in a threaded manner. The locking ring 230 is mainly used for limiting the travel of the movement of the focusing ring 400.
Referring to fig. 2 and 3, the rear lens assembly 300 includes a rear base 310 having an inner cavity, and a rear lens assembly 320 disposed in the inner cavity of the rear base 310, and a plurality of third steps 311 are also formed on an inner wall surface of the inner cavity of the rear base 310, and the rear lens assembly 320 includes a number of rear convex lenses 321 matching the number of third steps 311. Specifically, with reference to the direction of view of fig. 2, the third step 311 is formed with two annular third steps 311 sequentially from top to bottom. A third external thread 312 is further provided on the outer cylindrical wall surface at the lower end of the rear base 310. Specifically, the focusing ring 400 is sleeved on the middle base 210 and the rear base 310. The lower end of the focusing ring 400 is in threaded fit connection with the second external thread 213, and the upper end of the focusing ring 400 is in threaded fit connection with the third external thread 312 to connect the middle base 210 with the rear base 310, so as to connect the middle lens group 200 with the rear lens group 300. Wherein, a second through hole 330 is formed on the rear base 310.
The focusing principle of the industrial detection cone optical lens is as follows: rotating the focusing ring 400 drives the rear base 310 to move up and down so as to change the distance between the rear lens group 320 and the middle lens group 220, thereby realizing focusing of the axicon. The focusing of this structure can make the lens reach miniaturized purpose, more reducible preparation cone optical lens's material cost, and then reduces cone optical lens's cost of manufacture, increases market competition.
Referring to fig. 1 and 3, an arc-shaped clamping column 313 is further protruded on the outer wall surface of the cylinder of the rear base 310, and the arc-shaped clamping column 313 is mainly designed to be fixedly connected with a camera. In this embodiment, the camera is preferably a CCD camera.
The industrial detection cone optical lens has the advantages of simple structural design, few lens parts, convenient focusing, short focusing distance of the lens, accurate focusing and accurate focusing, small volume and convenient carrying.
Referring to fig. 4, based on the industrial inspection cone mirror described above, the invention further provides an imaging inspection method of the cone mirror, comprising the following steps:
S1: firstly, installing the industrial detection cone optical lens on a CCD camera 101;
s2: then placing a product to be detected 102 on one side of the industrial detection cone optical lens, wherein the distance between the product to be detected and the industrial detection cone optical lens is L3, L3 is the working distance of the lens, and the working distance of the lens is 3-50 mm;
s3: starting the CCD camera 103, and shooting a light beam emitted by a product to be detected by a front convex lens 121 of the industrial detection cone lens to simulate a light spot to form a light spot virtual image by a distance required by imaging;
S4: the convex lens and the rear convex lens of the industrial detection cone mirror absorb the facula virtual images to be converged into real images, and the real images are mapped to the CCD camera 103, so that the acquisition of the images of the products to be detected and the observation and analysis of the images of the products to be detected are realized.
In the step S2, the product to be detected is a product having a radiated light beam, such as a car lamp. Compared with fig. 4 and 6, the distance between the product to be detected and the cone optical lens detected by adopting the imaging detection method is short, so that the occupied area of detection equipment can be reduced, and the detection of a user is facilitated.
In the step S2, the dimension of L3 is more preferably 10mm, and the dimension of L3 is most preferably 5mm.
In the step S3, the light emitting angle R of the front convex lens of the industrial inspection cone lens capable of capturing the light beam is 0 ° to 160 °. More preferably, the angle of R is 120 °, and most preferably, the angle of R is 80 °. The imaging detection method is used for detecting the product, so that the product can absorb wider light, and has strong universality.
In the step S4, the distance between the position of the virtual spot image and the industrial inspection cone mirror is L2, and the size of L2 is 0.2m to 10m, more preferably, the size of L2 is 0.7m, and most preferably, the size of L2 is 0.35m.
Referring to fig. 4 and 5, the product is detected by the above-described imaging detection method of the axicon, the axicon is mounted on a CCD camera, so that focusing is facilitated, focusing is clear, and the imaging of the detected product is reflected to the CCD camera to form a real image after forming a facula virtual image on an optical film which is not in the prior art on the CCD camera, and the contour of the image acquired by the imaging detection method of the axicon is clear, so that observation and detection are facilitated.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. For those skilled in the art, the architecture of the invention can be flexible and changeable without departing from the concept of the invention, and serial products can be derived. But a few simple derivatives or substitutions should be construed as falling within the scope of the invention as defined by the appended claims.
Claims (7)
1. An industrial inspection cone mirror, comprising:
the front lens group comprises a plurality of front convex lenses;
the middle lens group comprises a plurality of middle convex lenses;
The rear lens group comprises a plurality of rear convex lenses;
One end of the middle lens group is fixedly connected with the front lens group through threads, the middle lens group at the other end is movably connected with the rear lens group through threads through a focusing ring, and the focusing ring is rotated to drive the rear lens group to move forwards and backwards so as to change the distance between the middle convex lens and the rear convex lens to realize focusing;
The middle lens group further comprises a middle base with an inner cavity, and a second external thread is arranged on the outer wall surface of the cylinder positioned at the upper end of the middle base; the rear mirror group comprises a rear base with an inner cavity, and a third external thread is arranged on the outer wall surface of the cylinder at the lower end of the rear base; the lower end of the focusing ring is in threaded fit connection with the second external thread, and the upper end of the focusing ring is in threaded fit connection with the third external thread, so that the middle base and the rear base are connected together, and the middle lens group and the rear lens group are further movably connected;
The front lens group comprises a front base with an inner cavity, an inner thread is arranged on the inner wall surface in the inner cavity of the front base, a first outer thread is arranged on the middle base corresponding to the middle lens group, and the front lens group is fixedly connected with the middle lens group by matching threaded connection of the inner thread and the first outer thread; and the second external thread is connected with a locking ring in a threaded manner, and the locking ring is used for limiting the moving stroke of the focusing ring.
2. The industrial inspection cone optical lens according to claim 1, wherein a plurality of first steps are formed on an inner wall surface in the inner cavity of the front base, and each front convex lens is arranged corresponding to each first step.
3. The industrial inspection cone optical lens according to claim 1, wherein the front base is further provided with a mounting connection plate in a protruding manner, and the mounting connection plate is provided with a plurality of mounting connection holes;
the front base is provided with a first through hole, a second through hole is formed in the rear base correspondingly, and the first through hole and the second through hole are used for transmitting light.
4. The industrial inspection cone optical lens according to claim 1, wherein a plurality of third steps are formed on the inner cavity of the rear base, and each rear convex lens is fixedly arranged on each third step.
5. An imaging detection method of a axicon according to any one of claims 1 to 4, characterized in that the imaging detection method of the axicon comprises the steps of:
s1: firstly, installing the industrial detection cone optical lens on a CCD camera;
S2: then placing a product to be detected on one side of the industrial detection cone optical lens, wherein the distance between the product to be detected and the industrial detection cone optical lens is L3, L3 is the working distance of the lens, and the working distance of the lens is 3-50 mm;
S3: starting the CCD camera, and shooting a light beam emitted by a product to be detected by a front convex lens of the industrial detection cone optical lens to simulate a light spot to form a light spot virtual image by a distance required by imaging;
S4: and the convex lens and the rear convex lens of the industrial detection cone optical lens absorb facula virtual images to be converged into real images, and the real images are mapped onto the CCD camera, so that the acquisition of the images of the products to be detected and the observation and analysis of the images of the products to be detected are realized.
6. The method according to claim 5, wherein in the step S3, the emission angle R of the industrial inspection axicon for taking in the light beam is 0 ° to 160 °.
7. The method for detecting an image of a axicon according to claim 5 or 6, wherein,
In the step S4, a distance between the position of the virtual spot image and the industrial inspection cone mirror is L2, and the dimension of L2 is 0.2 m-10 m.
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| CN201910080790.1A CN109814225B (en) | 2019-01-28 | 2019-01-28 | Industrial detection cone optical lens and imaging detection method thereof |
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| CN109212728A (en) * | 2018-11-14 | 2019-01-15 | 福建福光股份有限公司 | A kind of low full group mobile industrial camera lens that distorts of f50mm high-resolution |
| CN209311759U (en) * | 2019-01-28 | 2019-08-27 | 东莞敏威光电科技有限公司 | Industrial detection conoscope |
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| KR100939679B1 (en) * | 2007-12-11 | 2010-02-03 | (주)가하 | Apparatus and method for adjusting the focus automatically |
| KR100912466B1 (en) * | 2007-12-18 | 2009-08-14 | 삼성전기주식회사 | Auto focusing apparatus of camera module and auto focusing method thereof |
| CN106154499B (en) * | 2016-08-26 | 2019-07-26 | 福建福光股份有限公司 | Ultra-large aperture industrial lens and its working method |
| CN206411321U (en) * | 2016-12-16 | 2017-08-15 | 福建福光天瞳光学有限公司 | A kind of f16mm high definitions half group of movement light path system of low distortion and its industrial lens structure |
| CN106526805B (en) * | 2016-12-16 | 2022-09-16 | 福建福光天瞳光学有限公司 | F16mm high-definition low-distortion half-group mobile industrial lens |
| CN207008171U (en) * | 2017-07-31 | 2018-02-13 | 深圳法宝技术有限公司 | The gemolite of microscope polariscope system is installed |
| CN207488601U (en) * | 2017-12-08 | 2018-06-12 | 福州宏旭科技有限公司 | A kind of 8mm industrial lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109212728A (en) * | 2018-11-14 | 2019-01-15 | 福建福光股份有限公司 | A kind of low full group mobile industrial camera lens that distorts of f50mm high-resolution |
| CN209311759U (en) * | 2019-01-28 | 2019-08-27 | 东莞敏威光电科技有限公司 | Industrial detection conoscope |
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