CN114184353B - Optical lens assembly method - Google Patents
Optical lens assembly method Download PDFInfo
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- CN114184353B CN114184353B CN202010855207.2A CN202010855207A CN114184353B CN 114184353 B CN114184353 B CN 114184353B CN 202010855207 A CN202010855207 A CN 202010855207A CN 114184353 B CN114184353 B CN 114184353B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000003384 imaging method Methods 0.000 claims abstract description 70
- 238000001514 detection method Methods 0.000 claims description 9
- 230000003628 erosive effect Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011326 mechanical measurement Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0221—Testing optical properties by determining the optical axis or position of lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Lens Barrels (AREA)
Abstract
An optical lens assembly method includes a detecting step, including: defining a reference line passing through a center point of a reference plane and dividing the reference plane into two blocks; acquiring a first imaging point according to the light beam which is received by the image sensing element from the light source and passes through each optical lens, and acquiring a second imaging point after each optical lens rotates to a second position; each optical lens rotates to a third position to obtain a third imaging point, and the circle center position of a circle passing through the first imaging point, the second imaging point and the third imaging point is calculated; dividing two corresponding blocks of each optical lens into two types according to the falling point of the circle center position; and an assembly step comprising: at least two optical lenses belonging to one of the two types of optical lenses are disposed in one barrel, and at least two optical lenses belonging to the other of the two types of optical lenses are disposed in the other barrel.
Description
Technical Field
The present invention relates to an optical lens; in particular to a lens decentration detection and lens assembly method.
Background
When the optical lens is manufactured or assembled in a system, if the optical axis is not coincident with the rotational symmetry axis, an eccentric error is generated, which leads to a plurality of problems of imaging and imaging quality, therefore, before the assembly, the optical axis offset of the lens is generally checked, and the eccentric error measurement mode is divided into a mechanical measurement method and an optical measurement method according to different precision.
In the optical measurement method, when the optical measurement method is used for detecting, incident light rays penetrate through the lens to be detected and rotate the lens to be detected by a rotation axis, if the lens to be detected has an eccentric phenomenon, a circular light spot moving track is seen on a screen of a photo-Charge Coupled Device (CCD), and the eccentric amount of the lens to be detected can be calculated according to the light spot moving track. However, although the eccentricity of the measuring lens can be calculated by the optical measuring method, generally, if the lens detects the eccentricity, the lens can be discarded as a defective product to avoid affecting the imaging quality, and the waste of resources and the burden on cost are not caused, so how to screen the offset lens before the optical lens is assembled, and provide good imaging quality without increasing the manufacturing cost is a problem to be solved by the inventor.
Disclosure of Invention
Accordingly, the present invention is directed to an optical lens assembly method, which can screen out offset lenses and provide good imaging quality after assembly.
The present invention provides an optical lens assembly method, which comprises a plurality of optical lenses respectively performing a detection step, wherein the detection step comprises:
A. defining a reference plane, the reference plane having a center point, defining at least one reference line through the center point and dividing the reference plane into at least two blocks;
B. an image sensing element receives a light beam passing through each optical lens from a light source, captures a first image from the image output by the image sensing element, and obtains a first imaging point according to the first image, wherein the light source projects the light beam along a first axial direction, each optical lens is arranged at a first position, and the first axial direction passes through the center point of the reference surface and the center of each optical lens;
C. each optical lens rotates from the first position to a second position by taking a rotating shaft as an axis, then the image output by the image sensing element captures a second image, and a second imaging point is obtained according to the second image, wherein the rotating shaft is parallel to the first axial direction;
D. each optical lens rotates to a third position by taking the rotating shaft as an axis, then the image output by the image sensing element captures a third image, and a third imaging point is obtained according to the third image, wherein the third position is different from the first position and the second position;
E. calculating a circle center position of a circle passing through the first imaging point, the second imaging point and the third imaging point according to the first imaging point, the second imaging point and the third imaging point, wherein the circle center position corresponds to one of the at least two blocks;
F. dividing each optical lens into at least two types, wherein one type of optical lens corresponds to one of the at least two blocks at the center position, and the other type of optical lens corresponds to the other of the at least two blocks at the center position; and
an assembly step comprising:
at least two optical lenses belonging to one of at least two types are arranged in a lens cone.
The invention has the advantages that the optical lenses can be paired by the optical lens assembling method, so that the optical lenses with the center positions falling on the same block can be arranged in the same lens barrel, thereby improving the problem of poor imaging quality of the lenses in the optical lens caused by overlarge eccentric errors and reducing the manufacturing cost of the optical lens.
Drawings
FIG. 1 is a schematic diagram of a lens inspection apparatus.
FIG. 2 is a flow chart of an optical lens assembly method according to a preferred embodiment of the invention.
FIG. 3 is a schematic view of the reference surface of the preferred embodiment.
FIG. 4 is a first image of the preferred embodiment.
FIG. 5 is a first image of the preferred embodiment.
FIG. 6 is a photograph of the first image of the preferred embodiment after binarization.
FIG. 7 is a photograph of the first image of the preferred embodiment after image expansion processing.
FIG. 8 is a photograph of the first image of the preferred embodiment after image thinning.
FIG. 9 is a photograph of the first, second and third imaging points of the preferred embodiment.
Detailed Description
In order to more clearly illustrate the present invention, preferred embodiments are described in detail below with reference to the accompanying drawings. Referring to fig. 1, a lens inspection apparatus 1 is shown, the lens inspection apparatus 1 includes a light source 10, a clamping fixture 20, an image sensor 40 and a signal processing unit 60, the light source 10 projects a cross-mark parallel beam along a first axis X, the clamping fixture 20 is used for clamping an optical lens L to be inspected, and rotates around a rotation axis S, the rotation axis S is parallel to the first axis X, the image sensor 40 is a photographing device with a photo-coupler (CCD) for receiving a beam from the light source 10 passing through the optical lens L to be inspected, the signal processing unit 60 is connected with the image sensor 40, and the signal processing unit 60 is used for performing image processing on an image output by the image sensor 40.
Referring to fig. 2, a flowchart of an optical lens assembly method according to a preferred embodiment of the invention is shown, wherein the optical lens assembly method is performed by the lens detection device 1, and the optical lens assembly method comprises the following steps:
respectively performing a detection step on a plurality of optical lenses, wherein the detection step comprises the following steps:
step S101, defining a reference plane P having a center point C, defining a reference line passing through the center point C, as shown in fig. 3, the reference line includes a first reference line L1 and a second reference line L2, the first reference line L1 and the second reference line L2 perpendicularly intersect at the center point C, and dividing the reference plane P into a first block A1, a second block A2, a third block A3 and a fourth block A4;
step S102, the image sensor 40 receives the light beam from the light source 10 passing through each of the optical lenses L, the signal processing unit 60 captures a first image from the image output by the image sensor 40 and obtains a first imaging point P1 according to the first image, wherein the light source 10 projects the light beam along the first axial direction X, each of the optical lenses L is disposed at a first position, and the first axial direction X passes through the center point C of the reference plane P and the center of each of the optical lenses L;
step S103, after each optical lens L rotates from the first position to a second position with the rotation axis S as an axis center, the signal processing unit 60 captures a second image from the image output by the image sensing device 40, and obtains a second imaging point P2 according to the second image; in this embodiment, each of the optical lenses L is rotated from the first position to the second position by a first angle of 10-15 degrees, and in practice, the rotation angle of each of the optical lenses L from the first position to the second position may be other angles, not limited to the above 10-15 degrees.
Step S104, after each optical lens L rotates about the rotation axis S to the third position, the signal processing unit 60 captures a third image from the image output by the image sensing device 40, and obtains a third imaging point P3 according to the third image, where the third position is different from the first position and the second position; in this embodiment, the optical lenses L are rotated from the second position to the third position by a second angle of 10 to 15 degrees, and in practice, the rotation angle of each optical lens L from the second position to the third position may be other angles, not limited to the above 10 to 15 degrees, but in this embodiment, the first angle is equal to the second angle, and in other embodiments, the first angle may be different from the second angle.
In step S105, referring to fig. 3, the signal processing unit 60 calculates a center C1 of a circle passing through the first imaging point P1, the second imaging point P2 and the third imaging point P3 according to the first imaging point P1, the second imaging point P2 and the third imaging point P3, wherein the center C1 corresponds to one of the first block A1, the second block A2, the third block A3 and the fourth block A4;
step S106, according to the block of the reference plane P corresponding to the center C1, the optical lenses L are divided into four types including a first type, a second type, a third type and a fourth type according to the first block A1, the second block A2, the third block A3 and the fourth block A4, for example, if the center C1 of the optical lens L to be measured is located in the second block A2 as shown in fig. 3, the optical lens L to be measured is classified into the second type, and similarly, if the center C1 of another optical lens to be measured is located in the first block A1, the other optical lens to be measured is classified into the first type.
The optical lens assembly method includes an assembly step S201, including: at least two optical lenses belonging to the first class, the second class, the third class and the fourth class are respectively arranged in a lens cone. For example, a user can select at least two optical lenses required from a plurality of optical lenses belonging to a first class to be arranged in one lens barrel, and the user can select at least two optical lenses required from a plurality of optical lenses belonging to a second class, a third class or a fourth class to be respectively arranged in different lens barrels.
It should be noted that, in the present embodiment, the reference line includes the first reference line L1 and the second reference line L2, the first reference line L1 and the second reference line L2 vertically intersect at the center point C, the reference plane P is divided into a first block A1, a second block A2, a third block A3 and a fourth block A4, in other embodiments, the reference line may be one or more than two, for example, when the reference line is one, the reference line passes through the center point and the reference line divides the reference plane into two blocks, including a first block and a second block, the center position corresponds to one of the two blocks, the optical lenses are divided into two classes, including a first class and a second class, if the center position of the optical lens to be measured is located in the second block, the optical lens to be measured is distinguished into a second class, and if the center position of the optical lens to be measured is located in the second class, and then the optical lens to be measured is located in the second class, and the optical lens to be measured is located in the second class is different from the first class, and the optical lens to be measured optical lens is located in the second class.
The optical lens assembly method further includes performing an image processing on the first image, the second image and the third image, wherein the image processing includes a binarization processing, an image expansion processing, an image erosion processing and an image thinning processing as shown in fig. 6 to 9, so as to obtain the first imaging point P1, the second imaging point P2 and the third imaging point P3, respectively, and in this embodiment, the image processing of the first image (in accordance with fig. 4) is performed sequentially in the order of the binarization processing (in accordance with fig. 5), the image expansion processing (in accordance with fig. 6), the image erosion processing (in accordance with fig. 7) and the image thinning processing (in accordance with fig. 8).
In this embodiment, taking the first imaging point P1, the second imaging point P2 and the third imaging point P3 as an example, in other embodiments, the detecting step includes repeatedly performing step S104 to obtain a plurality of third imaging points P3, where the plurality of third imaging points P3 are different from each other (in cooperation with fig. 9), and step S105 includes calculating a center C2 of a circle passing through the first imaging point P1, the second imaging point P2 and the plurality of third imaging points P3 according to the first imaging point P1, the second imaging point P2 and the plurality of third imaging points P3, and by obtaining a plurality of third imaging points, the accuracy of the calculated center C2 can be improved.
In summary, by the optical lens assembly method of the present invention, the optical lenses can be paired so that the optical lenses with center positions falling on the same block can be disposed in the same lens barrel, thereby improving the problem of poor imaging quality caused by excessive eccentric error of the lenses in the optical lens and reducing the manufacturing cost of the optical lens.
The above description is only of a preferred embodiment of the invention, and all changes that come within the meaning and range of equivalency of the description and the claims are therefore intended to be embraced therein.
Description of the reference numerals
[ invention ]
1: detection device
10: light source
20: clamping fixture
40: image sensor
60: signal processing unit
A1: first block
A2: second block
A3: third block
A4: fourth block
C: center point
C1, C2: center of circle
L: optical lens
L1: first reference line
L2: second reference line
P: reference plane
P1: first imaging point
P2: second imaging point
P3: a third imaging point
S: rotary shaft
X: first axial direction
S101, S102, S103, S104, S105, S106, S201: step (a)
Claims (9)
1. An optical lens assembly method comprises the following steps:
respectively performing a detection step on a plurality of optical lenses, wherein the detection step comprises the following steps:
A. defining a reference plane, the reference plane having a center point, defining at least one reference line through the center point and dividing the reference plane into at least two blocks;
B. an image sensing element receives a light beam passing through each optical lens from a light source, captures a first image from the image output by the image sensing element, and obtains a first imaging point according to the first image, wherein the light source projects the light beam along a first axial direction, each optical lens is arranged at a first position, and the first axial direction passes through the center point of the reference surface and the center of each optical lens;
C. each optical lens rotates from the first position to a second position by taking a rotating shaft as an axis, then the image output by the image sensing element captures a second image, and a second imaging point is obtained according to the second image, wherein the rotating shaft is parallel to the first axial direction;
D. each optical lens rotates to a third position by taking the rotating shaft as an axis, then the image output by the image sensing element captures a third image, and a third imaging point is obtained according to the third image, wherein the third position is different from the first position and the second position;
E. calculating a circle center position of a circle passing through the first imaging point, the second imaging point and the third imaging point according to the first imaging point, the second imaging point and the third imaging point, wherein the circle center position corresponds to one of the at least two blocks;
F. dividing each optical lens into at least two types, wherein one type of optical lens corresponds to one of the at least two blocks at the center position, and the other type of optical lens corresponds to the other of the at least two blocks at the center position; and
an assembly step comprising:
at least two optical lenses belonging to one of at least two types are arranged in a lens cone.
2. The optical lens assembly method according to claim 1, wherein the assembling step includes at least two of the plurality of optical lenses belonging to another one of at least two kinds being provided in another lens barrel.
3. The method of claim 1, comprising repeating step D to obtain a plurality of third imaging points, the plurality of third imaging points being different from each other, and step E comprising calculating center positions of circles passing through the first imaging point, the second imaging point, and the plurality of third imaging points based on the first imaging point, the second imaging point, and the plurality of third imaging points.
4. The method of claim 1, wherein the at least one reference line includes a first reference line and a second reference line, the first reference line and the second reference line intersect perpendicularly at the center point, the reference plane is divided into a first block, a second block, a third block and a fourth block, step F includes dividing each of the optical lenses into four types according to the block of the reference plane corresponding to the center position of each of the optical lenses; and the assembling step includes disposing at least two optical lenses belonging to the category of the first block, the category of the second block, the category of the third block, and the category of the fourth block in a lens barrel, respectively.
5. The method of claim 1, comprising performing an image process on the first image, the second image, and the third image, wherein the image process comprises a binarization process, an image expansion process, an image erosion process, and an image thinning process to obtain the first imaging point, the second imaging point, and the third imaging point, respectively.
6. The method of claim 1, wherein each of the optical lenses is rotated 10-15 degrees from the first position to the second position.
7. The method of claim 1, wherein each of the optical lenses is rotated 10-15 degrees from the second position to the third position.
8. The optical lens assembly method of claim 1, comprising rotating each of the optical lenses from the first position by a first angle to the second position, and rotating each of the optical lenses from the second position by a second angle to the third position, the first angle being equal to the second angle.
9. The optical lens assembly method of claim 1, wherein the light source projects a cross beam along the first axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010855207.2A CN114184353B (en) | 2020-08-24 | 2020-08-24 | Optical lens assembly method |
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| CN202010855207.2A CN114184353B (en) | 2020-08-24 | 2020-08-24 | Optical lens assembly method |
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| CN114184353B true CN114184353B (en) | 2024-03-05 |
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