NL2033725B1 - Lens alignment method and device - Google Patents
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- NL2033725B1 NL2033725B1 NL2033725A NL2033725A NL2033725B1 NL 2033725 B1 NL2033725 B1 NL 2033725B1 NL 2033725 A NL2033725 A NL 2033725A NL 2033725 A NL2033725 A NL 2033725A NL 2033725 B1 NL2033725 B1 NL 2033725B1
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- 238000000034 method Methods 0.000 title claims abstract description 64
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- 238000005259 measurement Methods 0.000 claims description 62
- 230000003287 optical effect Effects 0.000 claims description 22
- 238000003384 imaging method Methods 0.000 abstract description 18
- 230000006870 function Effects 0.000 description 113
- 238000004458 analytical method Methods 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
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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
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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
- G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
- G01M11/0257—Testing optical properties by measuring geometrical properties or aberrations by analyzing the image formed by the object to be tested
- G01M11/0264—Testing optical properties by measuring geometrical properties or aberrations by analyzing the image formed by the object to be tested by using targets or reference patterns
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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
- G01M11/0292—Testing optical properties of objectives by measuring the optical modulation transfer function
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/62—Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems
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Abstract
Provided are a lens alignment method and a lens alignment device. The lens alignment method is applied in the lens alignment device. The lens alignment device includes a chart, an image capture apparatus, a focusing apparatus, a centering apparatus, a processing apparatus, and an alignment apparatus. The chart is located on an image plane of a lens. The image capture apparatus is located on an object plane of the lens. The lens alignment method includes acquiring a current object plane chart image captured by the image capture apparatus, where the current object plane chart image includes an identification image; controlling the focusing apparatus to drive the chart to move to complete a focusing operation; controlling the centering apparatus to drive the lens to move to complete a centering operation according to a distance between a position where the identification image is located and a reference position; and calculating a modulation transfer function according to the current object plane chart image and controlling the alignment apparatus to drive a to-be—adjusted lens-sheet to move to complete an alignment operation according to a calculation result of the modulation transfer function. Through the preceding solution, the MTF value of a lens can be increased by adjusting the lens-sheet at the imaging end of the lens.
Description
LENS ALIGNMENT METHOD AND DEVICE
[0001] Embodiments of the present disclosure relate to lens technology and, in particular, relate to a lens alignment method and a lens alignment device.
[0002] At present, a real shot analysis method, a projection analysis method, and a modulation transfer function (MTF) analysis method are widely used for determining the resolution of a security prime lens include. The real shot analysis method and the projection analysis method have certain limitations, as generally, one set of apparatuses can only correspond to one or several lenses. In addition, due to that the object distance of a security lens is much greater than the image distance thereof, a relatively large field is required, and a manual operation is required to determine an imaging quality according to an imaging picture. Although the imaging quality is determined according to the same criterion, there are still differences in manual determinations due to different cognition of clarity and ambiguity. As a result, there are still quality differences in the lenses manually tested according to the real shot analysis method and the projection analysis method.
Furthermore, an error inevitably occurs in a manual test, resulting in the outflow of defective lenses.
[0003] The MTF analysis method is a relatively scientific method for analyzing the resolution of a lens at present, and an MTF is used for shipment at the request of a customer. Thus, the use of an accurate and stable MTF device for the quality sorting of a lens is an important guarantee for the quality of the lens shipment of a company. Some types of lenses with a high quality are difficult to assemble, resulting in a low qualification rate. The resolution of some unqualified products due to assemble may be improved by alignment. At present, since lens-sheets that need to be aligned are not completely secured, an end for alignment can only be disposed vertically upwards. However, at present, the
MTF detection are all performed by an MTF orthographic projection method. In this case, a chart is placed on the object plane above a lens, and an image capture apparatus is placed on the image plane below the lens to acquire an image. Thus, only the lens-sheets close to the object plane may be adjusted, but the lens-sheets at the imaging end cannot be adjusted. Moreover, a CMOS/CCD used for measurement through the MTF orthographic projection method has a layer of protective glass. The higher the pixel resolution is, the thicker the protective glass is. The distance between a lens and a photosensitive surface is affected by the thickness of the protective glass. When the thickness of the glass is greater than or close to the back focus of the lens, the measurement through the MTF orthographic projection method is limited.
[0004] The present disclosure provides a lens alignment method and a lens alignment device to adjust the lens-sheet at the imaging end.
[0005] In a first aspect, embodiments of the present disclosure provide a lens alignment method. The method is applied in a lens alignment device. The lens alignment device includes a chart, an image capture apparatus, a focusing apparatus, a centering apparatus, a processing apparatus, and an alignment apparatus. The chart is located on an image plane of a lens. The image capture apparatus is located an an object plane of the lens. The lens alignment method includes the steps below.
[00086] The current object plane chart image captured by the image capture apparatus is acquired. The current object plane chart image includes an identification image.
[0007] The focusing apparatus is controlled to drive the chart to move to complete a focusing operation. [C008] The centering apparatus is controlled to drive the lens to move to complete a centering operation according to a distance between the position where the identification image is located and a reference position.
[0009] A modulation transfer function is calculated according to the current object plane chart image. The alignment apparatus is controlled to drive a to-be-adjusted lens- sheet to move to complete an alignment operation according to a calculation result of the modulation transfer function.
[0010] In an optional embodiment of the present disclosure, the focusing apparatus being controlled to drive the chart to move to complete the focusing operation includes the steps below. [C011] A first image sharpness of the current object plane chart image is determined.
[0012] The focusing apparatus is controlled to drive the chart to move in a first direction. The image capture apparatus is controlled to capture a first object plane chart image after movement.
[0013] A second image sharpness of the first object plane chart image is determined.
[0014] It is determined whether the second image sharpness is greater than the first image sharpness.
[0015] When the second image sharpness is greater than the first image sharpness, the focusing apparatus is controlled to drive the chart to continue moving in the first direction until the second image sharpness reaches a preset sharpness request.
[0016] When the second image sharpness is not greater than the first image sharpness, the focusing apparatus is controlled to drive the chart to move in the opposite direction of the first direction, and the image capture apparatus is controlled to capture a second object plane chart image after movement.
[0017] A third image sharpness of the second object plane chart image is determined.
[0018] It is determined whether the third image sharpness is greater than the second image sharpness.
[0019] When the third image sharpness is greater than the second image sharpness, the focusing apparatus continues to be controlled to drive the chart to move in the opposite direction of the first direction and the image capture apparatus continues to be controlled to capture a second object plane chart image after movement until the third image sharpness reaches the preset sharpness request.
[0020] When the third image sharpness is not greater than the second image sharpness, the focusing apparatus is controlled to drive the chart to move in the first direction to complete the focusing operation.
[0021] In an optional embodiment of the present disclosure, the centering apparatus being controlled to drive the lens to move to complete the centering operation according to the distance between the position where the identification image is located and the reference position includes steps below.
[0022] The coordinate information of the identification image is acquired. The coordinate information includes first coordinate information and second coordinate information.
[0023] It is determined whether the first coordinate information is less than first preset coordinate information and whether the second coordinate information is less than second preset coordinate information.
[0024] When the first coordinate information is less than first preset coordinate information and the second coordinate information is less than second preset coordinate information, the centering operation is completed.
[0025] When the first coordinate information is not less than first preset coordinate information or the second coordinate information is not less than second preset coordinate information , the centering apparatus continues to be controlled to drive the lens to move according to the coordinate information and the coordinate information of the reference position until the first coordinate information is less than the first preset coordinate information, and the second coordinate information is less than the second preset coordinate information, to complete the centering operation.
[0026] In an optional embodiment of the present disclosure, the alignment apparatus being controlled to drive the to-be-adjusted lens-sheet to move to complete the alignment operation according to the calculation result of the modulation transfer function includes the steps below.
[0027] Lens-sheet adjustment parameters are determined based on the calculation result of the modulation transfer function. The lens-sheet adjustment parameters include a first adjustment value and a second adjustment value.
[0028] The alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move for a distance of the first adjustment value in a second direction and to move for a distance of the second adjustment value in a third direction based on the lens-sheet adjustment parameters. The second direction is orthogonal to the third direction.
[0029] In an optional embodiment of the present disclosure, the calculation result of the modulation transfer function includes tilt information at the image plane, field curvature information, and peak information.
[0030] The lens-sheet adjustment parameters being determined based on the calculation result of the modulation transfer function includes: a tilt angle of the to-be- adjusted lens-sheet is determined based on the tilt information at the image plane, the field curvature information, and the peak information; and the lens-sheet adjustment parameters are determined based on the tilt angle of the to-be-adjusted lens-sheet.
[0031] In an optional embodiment of the present disclosure, before the modulation transfer function is calculated according to the current object plane chart image, the method further includes: the focusing apparatus is controlled to drive the chart to move in a preset defocus measurement range; and after the modulation transfer function is calculated according to the current object plane chart image, the method further includes: it is determined whether the chart satisfies a preset defocus measurement end rule.
[0032] In an optional embodiment of the present disclosure, the focusing apparatus being controlled to drive the chart to move in the preset defocus measurement range 5 includes steps below.
[0033] The third coordinate information of the chart is acquired.
[0034] The focusing apparatus is controlled to drive the chart to move for a preset moving distance in the first direction, where the preset moving distance equals to a negative value of half of the preset defocus measurement range subtracting third preset coordinate information and subtracting the third coordinate information.
[0035] The focusing apparatus is controlled to drive the chart to move for a preset measurement distance in the opposite direction of the first direction. Fourth coordinate information of the chart is acquired after the chart has moved for the preset measurement distance.
[00386] It is determined whether the chart satisfies the preset defocus measurement end rule in the manners below.
[0037] It is determined whether a value of the fourth coordinate information is greater than a sum of the third preset coordinate information and half of the preset defocus measurement range.
[0038] When the value of the fourth coordinate information is greater than the sum of the third preset coordinate information and half of the preset defocus measuement range, the step in which the alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move to complete the operation according to the calculation result of the modulation transfer function is executed.
[0039] When the value of the fourth coordinate information is not greater than the sum of the third preset coordinate information and half of the preset defocus measurement range, the steps in which the focusing apparatus is controlled to drive the chart to move for the preset measurement distance in the opposite direction of the first direction, and the fourth coordinate information of the chart is acquired after the chart has moved for the preset measurement distance are executed.
[0040] In an optional embodiment of the present disclosure, the calculation result of the modulation transfer function includes a value of the modulation transfer function. After the modulation transfer function is calculated according to the current object plane chart image, the method further includes the step below.
[0041] A lens specification is determined based on the value of the modulation transfer function and a preset specification determination rule.
[0042] In an optional embodiment of the present disclosure, the lens specification being determined based on the value of the modulation transfer function and the preset specification determination rule includes the steps below.
[0043] It is determined whether the value of the modulation transfer function is greater than a first preset specification value.
[0044] When the value of the modulation transfer function is greater than the first preset specification value, it is determined that the to-be-adjusted lens-sheet is a first specification.
[0045] When the value of the modulation transfer function is less than the first preset specification value, it is determined whether the value of the modulation transfer function is greater than a second preset specification value. The second preset specification value is less than the first preset specification value.
[00486] When the value of the modulation transfer function is greater than the second preset specification value, it is determined that the to-be-adjusted lens-sheet is a second specification. The second specification is inferior to the first specification.
[0047] When the value of the modulation transfer function is less than the second preset specification value, it is determined whether the value of the modulation transfer function is greater than a third preset specification value. The third preset specification value is less than the second preset specification value.
[0048] When the value of the modulation transfer function is greater than the third preset specification value, it is determined that the current lens is a third specification. The third specification is inferior to the second specification.
[0049] When the value of the modulation transfer function is less than the third preset specification value, alignment operation is ended.
[0050] In an optional embodiment of the present disclosure, before the step in which the alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move to complete the alignment operation according to the calculation result of the modulation transfer function is executed, the method further includes the steps below.
[0051] The number of alignment times is accumulated.
[0052] It is determined whether the number of alignment times is greater than the preset number of times.
[0053] When the number of alignment times is greater than the preset number of times, the alignment operation is ended.
[0054] When the number of alignment times is less than or equal to the preset number of times, the step in which the alignment apparatus is controlled to drive the to-be- adjusted lens-sheet to move to complete the alignment operation according to the calculation result of the modulation transfer function is executed.
[0055] In an optional embodiment of the present disclosure, the lens alignment device further includes a display apparatus. After the current object plane chart image captured by the image capture apparatus is acquired, where the current object chart image includes an identification image, the method further includes the steps below.
[0056] The display apparatus is controlled to display the current object panel chart image in a display image. The reference position is the center position of the display image.
[0057] In a second aspect, embodiments of the present disclosure provide a lens alignment device. The lens alignment device includes a chart, an image capture apparatus, a focusing apparatus, a centering apparatus, a processing apparatus, and an alignment apparatus.
[0058] The chart has an identification image and is located on the image plane of the lens. The image capture apparatus is located on the object plane of the lens.
[0059] The image capture apparatus is configured to acquire an object plane chart image.
[0060] The focusing apparatus is configured to drive the chart to move so that the chart is in a lens focus.
[0061] The centering apparatus is configured to drive the lens to move to make the chart to be located at the main optical axis of the lens.
[0062] The alignment apparatus is configured to drive the to-be-adjusted lens-sheet to move.
[0063] The processing apparatus is configured to execute the lens alignment method according to any embodiments of the present disclosure.
[0084] In the present disclosure, the chart is located on the image plane of the lens.
The image capture apparatus is located on the object plane of the lens. In this manner, the image capture apparatus can acquire the object plane chart image. Then the processing device can calculate the modulation transfer function according to the object plane chart image, and the alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move to complete the alignment operation according to the calculation result of the modulation transfer function. Compared with a conventional orthographic projection method for measuring, the lens can be inverted at this time, so that the effect in which the lens at the image plane of the lens is adjusted to increase the MTF value of the lens can be implemented.
[0065] FIG. 1 is a schematic flowchart of a lens alignment method according to embodiment one of the present disclosure.
[0066] FIG. 2 is a schematic flowchart of the controlling the focusing apparatus to drive the chart to move to complete a focusing operation in FIG. 1.
[0067] FIG. 3 is a schematic flowchart of the controlling the centering apparatus to drive the lens to move to complete the centering operation according to the distance between the position where the identification image is located and the reference position in
FIG. 1.
[0068] FIG. 4 is a schematic flowchart of a lens alignment method according to embodiment two of the present disclosure.
[0069] FIG. 5 is a schematic flowchart of a lens alignment method according to embodiment three of the present disclosure.
[0070] FIG. 6 is a schematic flowchart of a lens alignment method according to embodiment four of the present disclosure.
[0071] FIG. 7 is a schematic diagram of a lens alignment device according to embodiment six of the present disclosure.
Reference list 51 chart 52 image capture apparatus 53 focusing apparatus 54 centering apparatus 55 alignment apparatus
[0072] The present disclosure is further described hereinafter in detail in conjunction with drawings and embodiments. It is to be understood that the embodiments described herein are intended to explain the present disclosure and not to limit the present disclosure.
Additionally, it is to be noted that for ease of description, only part, not all, of the structures related to the present disclosure are illustrated in the drawings.
Embodiment one
[0073] FIG. 1 is a schematic flowchart of a lens alignment method according to embodiment one of the present disclosure. This embodiment may be applied to the production of a security prime lens. This method may be executed in a lens alignment device. The lens alignment device includes a chart, an image capture apparatus, a focusing apparatus, a centering apparatus, a processing apparatus, and an alignment apparatus.
The chart is located on the image plane of a lens. The image capture apparatus is located on the object plane of the lens. The lens alignment method includes the steps S110-S140 as below.
[0074] In S110, the current object plane chart image captured by the image capture apparatus is acquired. The current object plane chart image includes an identification image.
[0075] The image capture apparatus refers to an apparatus having a capture function. The image capture apparatus may be composed of multiple cameras. The multiple cameras are used to shoot on the object plane of the lens, so that an image of the chart placed on the object plane can be obtained.
[0078] The identification image on the chart is an image that can play the role of identification and may be, for example, a cross shape or a plum blossom shape. In some embodiments, the chart may be a square plate, and the center of the square plate has a crosshair.
[0077] In S120, the focusing apparatus is controlled to drive the chart to move to complete a focusing operation.
[0078] The focusing apparatus refers to an apparatus that can drive the chart to be close to or away from the lens. The completion of the focusing operation indicates that the chart is located at the image focus of the lens.
[0079] In S130, the centering apparatus is controlled to drive the lens to move to complete a centering operation according to a distance between the position where the identification image is located and a reference position.
[0080] The centering apparatus refers to an apparatus that can drive the lens to move so that the identification image of the chart is located on a main optical axis. The reference position may be a point on the main optical axis. Taking the reference position as an origin, the centering apparatus is controlled through the distance between the position where the identification image is located and the reference position. In this manner, the centering apparatus can drive the lens to move so that the identification image is located on the main optical axis.
[0081] In S140, a modulation transfer function is calculated according to the current object plane chart image, and the alignment apparatus is controlled to drive a to-be-adjusted lens-sheet to move to complete an alignment operation according to a calculation result of the modulation transfer function.
[0082] The modulation transfer function (MTF) is the proportion of the contrast of an output image to the contrast of an input image. The modulation transfer function is also referred to as a spatial contrast transfer function, or, a spatial frequency contrast sensitivity function. The capability of an optical system to transfer sine object modulation degrees of various frequencies is reflected by the function of a spatial frequency. The modulation transfer function may be used to represent the characteristics of the optical system. The larger the MTF is, the better the imaging quality of the system is. The calculation result of the modulation transfer function refers to values of some parameters, such as an MTF value, an MTF defocus value, and a field curvature, which are obtained when the modulation transfer function is calculated. Different calculation methods may lead to different results, which is not limited herein.
[0083] The alignment apparatus refers to an apparatus that can drive the to-be- adjusted lens-sheet to move. Since the chart is placed on the image plane, the to-be- adjusted lens-sheet is a lens-sheet at an imaging end. The alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move to a position where the MTF value is higher through the calculation result of the modulation transfer function, thereby optimizing the performance of the to-be-adjusted lens-sheet.
[0084] In the preceding solutions, the chart is located on the image plane of the lens.
The image capture apparatus is located on the object plane of the lens. In this manner, the image capture apparatus can acquire the current object plane chart image. Then the processing device can calculate the modulation transfer function according to the current object plane chart image, and the alignment apparatus is controlled to drive the to-be- adjusted lens-sheet to move to complete the alignment operation according to the calculation result of the modulation transfer function. Compared with the conventional orthographic projection method for measuring, the lens can be inverted at this time, so that the effect in which the lens-sheet at the imaging end of the lens is adjusted to increase the
MTF value of the lens can be achieved.
[0085] For example, as shown in FIG. 2, in $120, the focusing apparatus is controlled to drive the chart to move to complete the focusing operation in the manners below.
[0086] In S121, a first image sharpness of the current object plane chart image is determined.
[0087] In S122, the focusing apparatus is controlled to drive the chart to move in a first direction, and the image capture apparatus is controlled to capture a first object plane chart image after movement.
[0088] In S123, a second image sharpness of the first object plane chart image is determined.
[0089] In S124, it is determined whether the second image sharpness is greater than the first image sharpness.
[0090] When the second image sharpness is greater than the first image sharpness, step S122 is returned to. Again, the focusing apparatus is controlled to drive the chart to move in the first direction, and the image capture apparatus is controlled to capture the first object plane chart image after movement, until the second image sharpness reaches a preset sharpness request.
[0091] When the second image sharpness is not greater than the first image sharpness, step S125 is executed.
[0092] In S125, the focusing apparatus is controlled to drive the chart to move in an opposite direction of the first direction, and the image capture apparatus is controlled to capture a second object plane chart image after movement.
[0093] In S126, a third image sharpness of the second object plane chart image is determined.
[0094] In $127, it is determined whether the third image sharpness is greater than the second image sharpness.
[0095] When the third image sharpness is greater than the second image sharpness, step S125 is returned to. Again, the focusing apparatus is controlled to drive the chart to moving in the opposite direction of the first direction, and the image capture apparatus is controlled to capture the second object plane chart image after movement, until the third image sharpness reaches the preset sharpness request.
[0096] When the third image sharpness is not greater than the second image sharpness, step S128 is executed.
[0097] In S128, the focusing apparatus is controlled to drive the chart to move in the first direction, to complete the focusing operation.
[0098] The image sharpness of the current object panel chart image may be calculated through an image sharpness evaluation function. Common image sharpness evaluation functions mainly include an evaluation function based on a frequency domain characteristic, an evaluation function based on a statistical characteristic, and an evaluation function based on a spatial domain characteristic. The evaluation function is not limited in this embodiment, as long as the image sharpness of the object panel chart image can be obtained.
[0099] When the focusing apparatus moves in the first direction until the second image sharpness is less than the first image sharpness, it indicates that the chart position where the second image sharpness is acquired is farther away from a focus in the first direction than the chart position where the first image sharpness is acquired. In this case, the chart moves in the opposite direction of the first direction, which indicates that the chart moves in the direction close to the focus. When the chart moves until the third image sharpness is less than the second image sharpness, it indicates that the chart position where the third image sharpness is acquired is farther away from the focus in the opposite direction of the first direction than the chart position where the second image sharpness is acquired. In this case, the focusing apparatus is controlled to drive the chart to move in the first direction, and the chart moves towards the focus. Thus, the chart can move to the focus position, and the focusing operation is completed. In a specific case where the lens is located below the chart, moving in the first direction refers to moving upwards, and moving inthe opposite direction of the first direction refers to moving downwards.
[00100] For example, as shown in FIG. 3, in step 130, the centering apparatus being controlled to drive the lens to move to complete the centering operation according to the distance between the position where the identification image is located and the reference position includes the steps S131 to S133 below.
[00101] In S131, the coordinate information of the identification image is acquired.
The coordinate information includes first coordinate information and second coordinate information.
[00102] In S132, it is determined whether the first coordinate information is less than first preset coordinate information and whether the second coordinate information is less than second preset coordinate information. [C0103] When the first coordinate information is less than first preset coordinate information and the second coordinate information is less than second preset coordinate information, the centering operation is completed.
[00104] When the first coordinate information is not less than first preset coordinate information or the second coordinate information is not less than second preset coordinate information, step S133 is executed.
[00105] In S133, the centering apparatus continues to be controlled to drive the lens to move according to the coordinate information and the coordinate information of the reference position until the first coordinate information is less than the first preset coordinate information, and the second coordinate information is less than the second preset coordinate information, to complete the centering operation.
[00106] The reference position may be a point on the main optical axis of the lens.
The first coordinate information and the second coordinate information refer to coordinate information of two different directions in the same coordinate system. When a value of the first coordinate information is less than that of the first preset coordinate information, and a value of the second coordinate information is less than that of the second preset coordinate information, it indicates that the position of the identification image is close to or located at the position of the main optical axis. In this case, it indicates that centering is completed.
When the value of the first coordinate information is greater than that of the first preset coordinate information, and/or the value of the second coordinate information is greater than that of the second preset coordinate information, it indicates that the position of the identification image is far away from the reference position. In this case, the lens is controlled to move according to the difference value between the coordinate of the reference position and the first coordinate information and the difference value between the coordinate of the reference position and the second coordinate information, so that the lens may be moved until the identification image is located on the main optical axis to complete the centering operation.
[00107] In a specific embodiment, the first coordinate information may be x coordinate information, and the second coordinate information may be y coordinate information. The main optical axis direction of the lens is a z-axis direction. The reference position also has x coordinate and y coordinate correspondingly. The corresponding driving lens of the centering apparatus moves in x direction and y direction based on the difference value between x coordinate of the reference position and the first coordinate information and the difference value between y coordinate of the reference position and the second coordinate information. In this manner, the centering operation can be completed.
Embodiment two
[00108] FIG. 4 is a schematic flowchart of a lens alignment method according to embodiment two of the present disclosure. This embodiment of the present disclosure is an optimization on the basis of the preceding embodiment one. Optionally, the alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move to complete the alignment operation in the following manners according to the calculation result of the modulation transfer function: the lens-sheet adjustment parameters are determined based on the calculation result of the modulation transfer function, where the lens-sheet adjustment parameters include a first adjustment value and a second adjustment value; and the alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move for a distance of the first adjustment value in a second direction and to move for a distance of the second adjustment value in a third direction based on the lens-sheet adjustment parameters. The second direction is orthogonal to the third direction.
[00109] As shown in FIG. 4, the method includes the steps below. [C0110] In S210, the current object plane chart image captured by the image capture apparatus is acquired. The current object plane chart image includes an identification image.
[00111] In S220, the focusing apparatus is controlled to drive the chart to move to complete the focusing operation.
[00112] In S230, the centering apparatus is controlled to drive the lens to move to complete the centering operation according to the distance between the position where the identification image is located and the reference position.
[00113] In 5240, the modulation transfer function is calculated according to the current object plane chart image.
[90114] In S250, the lens-sheet adjustment parameters are determined based on the calculation result of the modulation transfer function. The lens-sheet adjustment parameters include a first adjustment value and a second adjustment value.
[00115] The lens-sheet adjustment parameters are parameter values used to improve the quality of the lens by the adjustment of the to-be-adjusted lens-sheet. The first adjustment value refers to the difference value between the position where the to-be- adjusted lens-sheet is located and an ideal position in the second direction. The second adjustment value refers to the difference value between the position where the to-be- adjusted lens-sheet is located and an ideal position in the third direction. The ideal position refers to a position where an optical axis of the last lens-sheet coincides with an optical axis of an optical system composed of other lens-sheets.
[00116] In S260, the alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move for a distance of the first adjustment value in the second direction and to move for a distance of the second adjustment value in the third direction based on the lens-sheet adjustment parameters. The second direction is orthogonal to the third direction.
[00117] The alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move for a distance of the first adjustment value in the second direction and to move for a distance of the second adjustment value in the third direction. In this manner, the effect in which the to-be-adjusted lens-sheet is adjusted to improve the lens quality can be implemented. In a specific embodiment, the second direction is an x-axis direction, and the third direction is a y-axis direction. The to-be-adjusted lens-sheet moves for the distance of the first adjustment value in the second direction and moves for the distance of the second adjustment value in the third direction. In this manner, the to-be-adjusted lens-sheet can be aligned, thereby improving the quality of the lens.
[00118] For example, the calculation result of the modulation transfer function includes tilt information at the image plane, field curvature information, and peak information.
[00119] The lens-sheet adjustment parameters being determined based on the calculation result of the modulation transfer function includes: the tilt angle of the to-be- adjusted lens-sheet is determined based on the tilt information at the image plane, the field curvature information, and the peak information; and the lens-sheet adjustment parameters are determined based on the tilt angle of the to-be-adjusted lens-sheet.
[00120] The field curvature information is also referred to as "curvature of field".
When there is field curvature in a lens, intersection points of all light beams do not coincide with an ideal image point. Although a clear image point can be obtained for each specific point of the intersection points, the entire image plane is a curved surface, which causes that the entire image plane cannot be clearly seen at the same time during a lens detection, and that observation and photographing cannot be easily performed. The peak information refers to the peak position in a defocus MTF curve.
[00121] Specifically, the imaging quality may be represented as a function of the image plane tilt T, the field curvature C, and the peak P, and the relationship between the imaging quality and factors of the to-be-adjusted lens-sheet can be expressed through the following relationship equation:
F(T, C, P)=F{f{d(k x cos(8), k x sin(8)), t(x, y)}, {h(z), g(z)}, Klax, y), h(z), rz), (x, y)}}-
[00122] In this function, F denotes the imaging quality; T denotes the image plane tilt;
C denotes the field curvature; P denotes the peak; d denotes a eccentricity of a lens-sheet; t denotes a tilt of a lens-sheet; h denotes a lens-sheet thickness; g denotes a spacing between lens-sheets; r denotes a surface accuracy of a lens-sheet; x and y denote direction coordinates of the vertical optical axis decomposed to the image plane; z denotes a direction coordinate along the optical axis; 8 denotes an angular coordinate in a two- dimensional plane formed by x and y; and k denotes an absolute value of the eccentricity of the lens-sheet. In this embodiment, 8 denotes the tilt angle of the to-be-adjusted lens- sheet, and x and y denote the first adjustment value and the second adjustment value respectively.
[00123] The adjustment manner and the adjustment amount of the to-be-adjusted lens-sheet are determined according to the relationship function between the imaging quality and the to-be-adjusted lens-sheet factors. That is, according to the relationship function between F(T, C, P) and x, y, z, and 8, in response to confirming the image plane tilt T, field curvature C, and/or peak P are determined as adjustment targets, an equation solution, i.e., the values of x, y, z, and 6 of a target moving position of the to-be-adjusted lens-sheet, which achieves an optimal F(T, C, P), can be solved by automatic calculation through a computer. That is, when the imaging quality is optimal, the values of x, y, z, and 6 of the target moving position of the to-be-adjusted lens-sheet can be calculated out by software. The to-be-adjusted lens-sheet moves with a target according to the calculated target moving position of to-be-adjusted lens-sheet. That is, the horizontal, vertical, tilt and circumferential directions of the to-be-adjusted lens-sheet are quantitatively adjusted. In this manner, the targeted correction of the to-be-adjusted lens-sheet is performed, achieving the target that the imaging quality can be quickly compensated during lens production, which achieves compensation for the decline of the imaging quality of a module due to the image plane tilt, the field curvature, and the peak caused by other components and an assembly tilt. After the to-be-adjusted lens-sheet is adjusted to meet requirements, the to-
be-adjusted lens-sheet which has been adjusted and meets requirements is secured, and the entire lens is encapsulated, thereby obtaining the lens with imaging quality meeting the requirements.
Embodiment three
[00124] FIG. 5 is a schematic flowchart of a lens alignment method according to embodiment three of the present disclosure. This embodiment of the present disclosure is an optimization on the basis of the preceding embodiment one. Optionally, before the modulation transfer function is calculated according to the current object plane chart image, the method further includes: the focusing apparatus is controlled to drive the chart to move in a preset defocus measurement range; and after the modulation transfer function is calculated according to the current object plane chart image, the method further includes: it is determined whether the chart satisfies a preset defocus measurement end rule.
[00125] As shown in FIG. 5, the method includes the steps below.
[00126] In S310, the current object plane chart image captured by the image capture apparatus is acquired. The current object plane chart image includes an identification image.
[00127] In S320, the focusing apparatus is controlled to drive the chart to move to complete the focusing operation.
[00128] In S330, the centering apparatus is controlled to drive the lens to move to complete the centering operation according to the distance between the position where the identification image is located and the reference position.
[00129] In S340, the focusing apparatus is controlled to drive the chart to move in the preset defocus measurement range.
[00130] Defocus amount information refers to a defocus curve, that is, a curve formed by MTF values when the chart is in a positive focus range and a negative focus range of the focus. The preset defocus measurement range is the positive focus range and the negative focus range near to the focus. [C0131] In S350, the modulation transfer function is calculated according to the current object plane chart image.
[00132] In S360, it is determined whether the chart satisfies the preset defocus measurement end rule.
[00133] The focusing apparatus is controlled to drive the chart to move in the preset defocus measurement range. When the chart satisfies the preset defocus measurement end rule, it indicates that the chart finishes moving in a defocus measurement range. In this manner, the defocus amount information can be calculated when the modulation transfer function is calculated according to the current object plane chart image.
[00134] In S370, the lens-sheet adjustment parameters are determined based on the calculation result of the modulation transfer function. The lens-sheet adjustment parameters include a first adjustment value and a second adjustment value.
[00135] In S380, the alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move for a distance of the first adjustment value in the second direction and to move for a distance of the second adjustment value in the third direction based on the lens-sheet adjustment parameters. The second direction is orthogonal to the third direction.
[00138] For example, the focusing apparatus is controlled to drive the chart to move in the preset defocus measurement range in the manners below.
[00137] Third coordinate information of the chart is acquired.
[00138] The focusing apparatus is controlled to drive the chart to move for a preset moving distance in the first direction, where the preset moving distance equals to half of a negative the preset defocus measurement range subtracting third preset coordinate information and subtracting the third coordinate information, i.e., the preset moving distance = -(the preset defocus measurement range/2) - third preset coordinate information - the third coordinate information.
[00139] The focusing apparatus is controlled to drive the chart to move for a preset measurement distance in the opposite direction of the first direction. Fourth coordinate information of the chart is acquired after the chart has been moved for the preset measurement distance.
[00140] The first direction is one of a positive focus direction and a negative focus direction. The third preset coordinate information is preset focus position information. The third coordinate information represents position information when the chart is located at an actual focus. The preset moving distance = (the preset defocus measurement range/2) - the third preset coordinate information - the third coordinate information, so that the chart can move outside the preset defocus measurement range after the chart has been moved for the preset moving distance in the first direction. The focusing apparatus is controlled to drive the chart to move for the preset measurement distance in the opposite direction of the first direction. The preset measurement distance is a unit length when defocus information is measured. In this manner, MTF values of the chart at different positions in the preset defocus measurement range can be gradually obtained, thereby obtaining the defocus amount information. [C0141] It is determined whether the chart satisfies the preset defocus measurement end rule in the manners below.
[00142] It is determined whether the fourth coordinate information is greater than the sum of the third preset coordinate information and half of the preset defocus measurement range.
[00143] When the fourth coordinate information is greater than the sum of the third preset coordinate information and half of the preset defocus measurement range, the step in which the alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move to complete the operation according to the calculation result of the modulation transfer function is executed.
[00144] When the fourth coordinate information is not greater than the sum of the third preset coordinate information and half of the preset defocus measurement range, the steps in which the focusing apparatus is controlled to drive the chart to move for the preset measurement distance in the opposite direction of the first direction, and the fourth coordinate information of the chart is acquired after the chart has been moved for the preset measurement distance are executed.
[00145] When the fourth coordinate information is greater than the sum of the third preset coordinate information and half of the preset defocus measurement range, it indicates that the chart moves from the outside of the preset defocus measurement range on one side of the focus to the outside of the preset defocus measurement range on the other side of the focus, that is, the chart gradually finishes moving in the preset defocus measurement range, thereby indicating that the defocus measurement ends.
Embodiment four
[00146] FIG. 6 is a schematic flowchart of a lens alignment method according to embodiment four of the present disclosure. This embodiment of the present disclosure is an optimization on the basis of the preceding embodiment one. Optionally, the calculation result of the modulation transfer function includes a value of the modulation transfer function. After the modulation transfer function is calculated according to the current object plane chart image, the method also includes the following steps.
[00147] A lens specification is determined based on the value of the modulation transfer function and a preset specification determination rule. Optionally, before that the alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move to complete the alignment operation according to the calculation result of the modulation transfer function are executed, the method also includes: the number of alignment times is accumulated; it is determined whether the number of alignment times is greater than the preset number of times; when the number of alignment times is greater than the preset number of times, alignment operation is ended; and when the number of alignment times is less than or equal to the preset number of times, the step in which the alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move to complete the alignment operation according to the calculation result of the modulation transfer function is executed.
[00148] As shown in FIG. 6, the method includes the steps below.
[00149] In S410, the current object plane chart image captured by the image capture apparatus is acquired. The current object plane chart image includes an identification image.
[00150] In S420, the focusing apparatus is controlled to drive the chart to move to complete the focusing operation.
[00151] In S430, the centering apparatus is controlled to drive the lens to move to complete the centering operation according to the distance between the position where the identification image is located and the reference position.
[00152] In S440, the focusing apparatus is controlled to drive the chart to move in the preset defocus measurement range.
[00153] In S450, the modulation transfer function is calculated according to the current object plane chart image.
[00154] In S460, it is determined whether the chart satisfies the preset defocus measurement end rule.
[00155] In S470, the lens-sheet adjustment parameters are determined based on the calculation result of the modulation transfer function. The lens-sheet adjustment parameters include a first adjustment value and a second adjustment value.
[00156] In S481, the lens specification is determined based on the value of the modulation transfer function and the preset specification determination rule.
[00157] The value of the modulation transfer function is also referred as an MTF value. The MTF value can represent the superiority and inferiority of the lens. The preset specification determination rule refers to a rule for classifying and determining the specification of the lens according to the value of the modulation transfer function. The larger the MTF value is, the better the quality of the lens is. Thus, the lens specification can be conveniently determined according to the value of the modulation transfer function and the preset specification determination rule, and the lens is easily classified.
[00158] In S491, the number of alignment times is accumulated.
[00159] The number of alignment times refers to the number of adjustment times of the to-be-adjusted lens-sheet.
[00160] In S492, it is determined whether the number of alignment times is greater than the preset number of times. When the number of alignment times is greater than the preset number of times, the alignment operation is ended; and when the number of alignment times is not greater than the preset number of times, step S482 is executed. [C0161] When the number of alignment times is greater than the preset number of times, it indicates that the lens is aligned for too many times. The lens may be a defective product that cannot meet the corresponding quality requirement through alignment. Hence, the alignment operation is ended, so that alignment is prevented from performing too many times and influencing the production efficiency. When the number of alignment times is not greater than the preset number of times, the alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move for a distance of the first adjustment value in the second direction and to move for a distance of the second adjustment value in the third direction according to the lens-sheet adjustment parameter. In this manner, the to-be-adjusted lens- sheet is adjusted to improve the lens quality.
[00162] In S482, the alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move for a distance of the first adjustment value in the second direction and to move for a distance of the second adjustment value in the third direction based on the lens-sheet adjustment parameters. The second direction is orthogonal to the third direction.
[00163] For example, the lens specification is determined in the manners below based on the value of the modulation transfer function and the preset specification determination rule. [C0164] It is determined whether the value of the modulation transfer function is greater than a first preset specification value. When the value of the modulation transfer function is greater than the first preset specification value, it is determined that the to-be- adjusted lens-sheet is a first specification.
[00165] When the value of the modulation transfer function is less than the first preset specification value, it is determined whether the value of the modulation transfer function is greater than a second preset specification value. The second preset specification value is less than the first preset specification value. When the value of the modulation transfer function is greater than the second preset specification value, it is determined that the to- be-adjusted lens-sheet is a second specification. The second specification is inferior to the first specification.
[00166] When the value of the modulation transfer function is less than the second preset specification value, it is determined whether the value of the modulation transfer function is greater than a third preset specification value. The third preset specification value is less than the second preset specification value. When the value of the modulation transfer function is greater than the third preset specification value, it is determined that the to-be- adjusted lens-sheet is a third specification. The third specification is inferior to the second specification.
[00167] When the value of the modulation transfer function is less than the third preset specification value, the alignment operation is ended.
[00168] When the value of the modulation transfer function is greater than the first preset specification value, it indicates that the lens reaches the standard of the first specification, so that the lens may be determined to be the first specification. When the value of the modulation transfer function is less than the first preset specification value, it indicates that the to-be-adjusted lens-sheet does not reach the standard of the first specification. Thus, it is determined whether the value of the modulation transfer function is greater than the standard of the second specification, where the second specification is lower than the specification of the first specification. When the value of the modulation transfer function is greater than the standard of the second specification, it indicates that the to-be-adjusted lens-sheet is the second specification. When the value of the modulation transfer function is also less than the second preset specification value, it indicates that the to-be-adjusted lens-sheet does not satisfy the standard of the first specification nor the standard of the second specification. Hence, it is determined whether the value of the modulation transfer function is greater than the third preset specification value. When the value of the modulation transfer function is greater than the third preset specification value, itindicates that the to-be-adjusted lens-sheet reaches the standard of the third specification.
Thus, it is determined that the to-be-adjusted lens-sheet is the third specification. When the value of the modulation transfer function is less than the third preset specification value, since the third specification is the minimum specification, it indicates that the lens does not satisfy any standard. The alignment operation is ended. Through the preceding solutions, the specification of the to-be-adjusted lens-sheet can be conveniently obtained, and the lens is easily classified.
[00169] In an optional embodiment of the present disclosure, the lens alignment device also includes a display apparatus. After the current object plane chart image captured by the image capture apparatus is acquired, where the current object chart image includes an identification image, the method also includes that: the display apparatus is controlled to display the current object panel chart image in a display image. The reference position is the center position of the display image.
[00170] The display apparatus refers to an apparatus that can display an image and may be a display screen. The display apparatus displays the current object panel chart image in the display image, and the reference position is the center position of the display image. In this manner, it is convenient for a user to intuitively obtain the difference value between the object panel chart image and the reference position. In addition, in practical applications, the display apparatus may also display values such as the specification of the lens and the value of the modulation transfer function.
Embodiment five
[00171] On the basis of the preceding embodiments, the lens alignment method in the embodiments of the present disclosure is described with reference to the actual alignment flow below.
[00172] First, the lens and the chart are mounted on the lens alignment device, where the chart is located on the image plane of the lens, and the image capture apparatus is located on the object plane of the lens. The focusing apparatus drives the chart to move to a preset initial position. The initial value of the number of alignment times is set to 1. Then the current object plane chart image captured by the image capture apparatus is acquired.
The first image sharpness of the current object plane chart image is determined. When the first image sharpness reaches a preset sharpness, it indicates that the chart is located at the focus. A centering process is started. When the first image sharpness does not reach the preset sharpness, it indicates that the chart is not located at the focus. A focusing flow is started, and the centering process is started after focusing is completed.
[00173] The third coordinate information of the chart is acquired after the centering process is finished. The focusing apparatus is controlled to drive the chart to move for the preset moving distance in the first direction, where the preset moving distance = -(the preset defocus measurement range/2) - the third preset coordinate information - the third coordinate information. Then the focusing apparatus is controlled to drive the chart to move for the preset measurement distance in the opposite direction of the first direction. The fourth coordinate information of the chart is acquired after the chart has been moved for the preset measurement distance. In this way, the chart may gradually move in the preset defocus measurement range. Then the modulation transfer function is calculated according to the current object plane chart image. Since the chart gradually moves in the preset defocus measurement range, the defocus amount information (that is, a defocus MTF and the peak) may be calculated when the modulation transfer function is calculated. Through different algorithms, the value of the modulation transfer function may be calculated to obtain information such as the value of the modulation transfer function, the field curvature, and an image plane deviation. Then it is determined whether the fourth coordinate information is greater than the sum of the third preset coordinate information and half of the preset defocus measurement range. When not, the chart continues moving for the preset measurement distance in the opposite direction of the first direction. When so, it indicates that the chart moves from the outside of the preset defocus measurement range on one side of the focus to the outside of the preset defocus measurement range on the other side of the focus, that is, the chart gradually finishes moving in the preset defocus measurement range, indicating that the defocus measurement ends.
[00174] Then based on the tilt angle of the lens-sheet in the calculation result of the modulation transfer function, itis determined whether the direction coordinate of the vertical optical axis decomposed to the image plane is less than a preset coordinate value, and the lens-sheet adjustment parameters are determined. The lens-sheet adjustment parameters include a first adjustment value and a second adjustment value. When the direction coordinate of the vertical optical axis decomposed to the image plane is greater than the preset coordinate value, the number of alignment times is accumulated. Further, it is determined whether the number of alignment times is greater than the preset number of times. When the number of alignment times is greater than the preset number of times, the alignment operation is ended. When the number of alignment times is less than or equal to the preset number of times, the steps in which the alignment apparatus is controlled to drive the to-be-adjusted lens-sheet to move for a distance of the first adjustment value in the second direction and to move for a distance of the second adjustment value in the third direction based on the lens-sheet adjustment parameter are executed. The second direction is orthogonal to the third direction. Then the second alignment process is started from the steps in which the current object plane chart image captured by the image capture apparatus is acquired, and the first image sharpness of the current abject plane chart image is determined.
[00175] When the direction coordinate of the vertical optical axis decomposed to the image plane is less than the preset coordinate value, the lens specification is determined based on the value of the modulation transfer function and the preset specification determination rule. That is, first, it is determined whether the value of the modulation transfer function is greater than the first preset specification value. When the value of the modulation transfer function is greater than the first preset specification value, it is determined that the to-be-adjusted lens-sheet is the first specification. When the value of the modulation transfer function is less than the first preset specification value, it is determined whether the value of the modulation transfer function is greater than the second preset specification value.
The second preset specification value is less than the first preset specification value. When the value of the modulation transfer function is greater than the second preset specification value, it is determined that the to-be-adjusted lens-sheet is the second specification. The second specification is inferior to the first specification. When the value of the modulation transfer function is less than the second preset specification value, it is determined whether the value of the modulation transfer function is greater than the third preset specification value. The third preset specification value is less than the second preset specification value.
When the value of the modulation transfer function is greater than the third preset specification value, it is determined that the to-be-adjusted lens-sheet is the third specification. The third specification is inferior to the second specification. When the value of the modulation transfer function is less than the third preset specification value, the alignment operation is ended.
Embodiment six
[001786] FIG. 7 is a schematic diagram of a lens alignment device according to embodiment six of the present disclosure. As shown in FIG. 7, the lens alignment device includes a chart 51, an image capture apparatus 52, a focusing apparatus 53, a centering apparatus 54, a processing apparatus (not shown in the figure), and an alignment apparatus 55.
[00177] The chart 51 has the identification image and is located on the image plane of the lens. The image capture apparatus 52 is located on the object plane of the lens.
[00178] The image capture apparatus 52 is configured to acquire an object plane chart image of the chart 51.
[00179] The focusing apparatus 53 is configured to drive the chart 51 to move to make the chart 51 to be located at the lens focus.
[00180] The centering apparatus 54 is configured to drive the lens to move to make the chart 51 to be located at the main optical axis of the lens.
[00181] The alignment apparatus 55 is configured to drive the to-be-adjusted lens- sheet to move.
[00182] The processing apparatus is configured to execute the lens alignment method according to any embodiments of the present disclosure.
[00183] In the preceding solutions, the chart 51 is located at the image plane of the lens. The image capture apparatus 52 is located at the object plane of the lens. In this manner, the image capture apparatus 52 can acquire the object plane chart 51 image. Then the processing device can calculate the modulation transfer function according to the object plane chart image of the chart 51, and the alignment apparatus 55 is controlled to drive the to-be-adjusted lens-sheet to move to complete the alignment operation according to the calculation result of the modulation transfer function. Compared with the conventional orthographic projection method for measuring, the lens can be inverted at this time, so that the effect in which the lens-sheet at the imaging end of the lens is adjusted to increase the
MTF value of the lens can be implemented.
[00184] Optionally, the lens alignment device also includes a display apparatus (not shown in the figure). The display apparatus is configured to display the current object panel chart 51 image in the display image. In practical applications, the display apparatus may display values such as the specification of the lens and the value of the modulation transfer function. In a specific embodiment, the display apparatus is a display screen. The lens alignment device has a housing (not shown in the figure). The display screen is disposed on the housing. [C0185] It is to be noted that the preceding are only preferred embodiments of the present disclosure and technical principles used therein. It is to be understood by those skilled in the art that the present disclosure is not limited to the embodiments described herein. Those skilled in the art can make various apparent modifications, adaptations, and substitutions without departing from the scope of the present disclosure. Therefore, while the present disclosure has been described in detail through the preceding embodiments,
the present disclosure is not limited to the preceding embodiments and may include more other equivalent embodiments without departing from the concept of the present disclosure.
The scope of the present disclosure is determined by the scope of the appended claims.
Claims (11)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2033725A NL2033725B1 (en) | 2022-12-15 | 2022-12-15 | Lens alignment method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2033725A NL2033725B1 (en) | 2022-12-15 | 2022-12-15 | Lens alignment method and device |
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| NL2033725B1 true NL2033725B1 (en) | 2024-01-05 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3392699A1 (en) * | 2015-12-16 | 2018-10-24 | Ningbo Sunny Opotech Co., Ltd. | Method for compensating imaging quality of optical system by adjusting lens |
| CN115685576A (en) * | 2021-07-28 | 2023-02-03 | 东莞市宇瞳光学科技股份有限公司 | Lens alignment method and device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3392699A1 (en) * | 2015-12-16 | 2018-10-24 | Ningbo Sunny Opotech Co., Ltd. | Method for compensating imaging quality of optical system by adjusting lens |
| CN115685576A (en) * | 2021-07-28 | 2023-02-03 | 东莞市宇瞳光学科技股份有限公司 | Lens alignment method and device |
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