阅读说明：本技术 一种滤光片的检测方法及三点弯折设备 (Optical filter detection method and three-point bending equipment ) 是由 李俊峰 冯康帅 于 2021-07-22 设计创作，主要内容包括：本发明公开一种滤光片的检测方法及三点弯折设备,所述方法包括：采用三点弯折设备对滤光片进行三点弯折测试,以获得滤光片的断裂载荷和断裂位移；根据所述断裂载荷、所述三点弯折设备的支撑跨距和所述滤光片的尺寸参数确定所述滤光片的应力强度；根据所述断裂位移、所述三点弯折设备的支撑跨距和所述滤光片的尺寸参数确定所述滤光片的应变强度。本发明提供的方法和设备用以解决现有技术中的滤光片检测方式存在的缺陷品筛出的准确度低,容易漏检导致客户质量事故的技术问题。实现了提高缺陷品筛选的准确率减少漏检和减少质量事故的技术效果。(The invention discloses a detection method of an optical filter and three-point bending equipment, wherein the method comprises the following steps: carrying out three-point bending test on the optical filter by adopting three-point bending equipment to obtain the fracture load and the fracture displacement of the optical filter; determining the stress intensity of the optical filter according to the fracture load, the support span of the three-point bending equipment and the size parameters of the optical filter; and determining the strain intensity of the optical filter according to the fracture displacement, the support span of the three-point bending equipment and the size parameters of the optical filter. The method and the device provided by the invention are used for solving the technical problems that the screening accuracy of defective products is low and the quality accidents of customers are easily caused by missing detection in the optical filter detection mode in the prior art. The technical effects of improving the accuracy of screening defective products, reducing missing detection and reducing quality accidents are achieved.)

1. A method for detecting an optical filter, comprising:

carrying out three-point bending test on the optical filter by adopting three-point bending equipment to obtain the fracture load and the fracture displacement of the optical filter;

determining the stress intensity of the optical filter according to the fracture load, the support span of the three-point bending equipment and the size parameters of the optical filter;

and determining the strain intensity of the optical filter according to the fracture displacement, the support span of the three-point bending equipment and the size parameters of the optical filter.

2. The method of claim 1, wherein determining the stress intensity of the optical filter according to the fracture load, the support span of the three-point bending apparatus, and the dimensional parameters of the optical filter comprises:

determining the stress intensity of the optical filter by using a formula 3 h 1L/(2 b m), wherein h1 is the fracture load, L is the support span, b is the width of two ends of the optical filter spanning the three-point bending device, and m is the thickness of the optical filter.

3. The method of claim 2, further comprising:

judging whether the stress strength is more than 100 MPa;

and if not, determining that the optical filter is unqualified.

4. The method of claim 1, wherein determining the strain strength of the optical filter according to the fracture displacement, the support span of the three-point bending apparatus, and the dimensional parameters of the optical filter comprises:

determining the strain strength of the filter using the formula [6 × h2 × m/(L × L) ] × 1000000, wherein h2 is the fracture displacement, L is the support span, and m is the thickness of the filter.

5. The method of claim 4, further comprising:

judging whether the strain strength is greater than 2000 MPa;

and if not, determining that the optical filter is unqualified.

6. A three-point bending apparatus, comprising: the pressing rod and the three-point bending jig;

the three-point bending jig is provided with N pairs of supporting structures, wherein the supporting span of each pair of supporting structures in the N pairs of supporting structures is different from the supporting spans of other pairs of supporting structures, and N is larger than 1.

7. A three point bending apparatus according to claim 6, wherein the support spans of the N pairs of support structures increase or decrease progressively along the direction of deployment, and the difference in support spans between two adjacent pairs of support structures in the N pairs of support structures is 1.5 mm.

8. A three-point bending apparatus as claimed in claim 6, wherein the three-point bending jig is provided with a base, the N pairs of supporting structures are fixed on the base, and the base is provided with a fixing structure for fixing the three-point bending jig.

9. A three point bending apparatus according to claim 8 wherein said securing structure is a threaded hole formed in each side of said N pairs of support structures, said three point bending apparatus being secured by screws passing through said threaded holes.

10. A method for detecting an optical filter, comprising:

inspecting said optical filter by the method of any of claims 1-5 using the three-point bending apparatus of any of claims 6-9.

Technical Field

The invention relates to the technical field of testing, in particular to a method for detecting an optical filter and three-point bending equipment.

Background

The optical filter needs to be mounted on the camera module after being cut, but the side edge of the optical filter after being cut by laser is easy to have defects such as sintered layer deviation and cracks, and the strength of the optical filter is reduced.

In order to ensure the quality of the module delivered to the customer, the quality of the cut filter needs to be checked. In the existing detection method, an inspector visually inspects the side surface of the optical filter through a microscope to identify defects such as the deviation and the crack of the sintering layer. However, the accuracy of manual visual inspection is low, and missing inspection easily occurs.

Therefore, the existing optical filter detection mode has low accuracy of screening out defective products, and is easy to miss detection to cause customer quality accidents.

Disclosure of Invention

In view of the above problems, the present invention has been made to provide a method of detecting a filter and a three-point bending apparatus that overcome or at least partially solve the above problems.

In a first aspect, a method for detecting an optical filter is provided, including:

carrying out three-point bending test on the optical filter by adopting three-point bending equipment to obtain the fracture load and the fracture displacement of the optical filter;

determining the stress intensity of the optical filter according to the fracture load, the support span of the three-point bending equipment and the size parameters of the optical filter;

and determining the strain intensity of the optical filter according to the fracture displacement, the support span of the three-point bending equipment and the size parameters of the optical filter.

Optionally, the determining the stress strength of the optical filter according to the fracture load, the support span of the three-point bending apparatus, and the size parameter of the optical filter includes: determining the stress intensity of the optical filter by using a formula 3 h 1L/(2 b m), wherein h1 is the fracture load, L is the support span, b is the width of two ends of the optical filter spanning the three-point bending device, and m is the thickness of the optical filter.

Optionally, the method further includes: judging whether the stress strength is more than 100 MPa; and if not, determining that the optical filter is unqualified.

Optionally, the determining the strain strength of the optical filter according to the fracture displacement, the support span of the three-point bending apparatus, and the size parameter of the optical filter includes: determining the strain strength of the filter using the formula [6 × h2 × m/(L × L) ] × 1000000, wherein h2 is the fracture displacement, L is the support span, and m is the thickness of the filter.

Optionally, the method further includes: judging whether the strain strength is greater than 2000 MPa; and if not, determining that the optical filter is unqualified.

In a second aspect, there is provided a three-point bending apparatus comprising:

the pressing rod and the three-point bending jig;

the three-point bending jig is provided with N pairs of supporting structures, wherein the supporting span of each pair of supporting structures in the N pairs of supporting structures is different from the supporting spans of other pairs of supporting structures, and N is larger than 1.

Optionally, the support spans of the N pairs of support structures are increased or decreased progressively along the arrangement direction, and the difference between the support spans of two adjacent pairs of support structures in the N pairs of support structures is 1.5 mm.

Optionally, a base is arranged on the three-point bending jig, the N pairs of supporting structures are fixed on the base, and a fixing structure is arranged on the base to stabilize the three-point bending jig.

Optionally, the fixing structure is screw holes formed in two sides of the N pairs of supporting structures, and the three-point bending device is stabilized through screws penetrating through the screw holes.

In a third aspect, a method for detecting an optical filter is provided, including:

and detecting the optical filter by using the three-point bending device of the second aspect through the method of the first aspect.

The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:

according to the detection method of the optical filter and the three-point bending device provided by the embodiment of the invention, the three-point bending test is carried out on the optical filter by adopting the three-point bending device, so that the fracture load and the fracture displacement of the optical filter are obtained; and the stress intensity and the strain intensity of the optical filter are accurately determined according to the two sets of data by combining the support span of the three-point bending equipment and the size parameters of the optical filter, so that the defective products can be accurately screened out. Thereby avoiding the missing inspection and quality accidents caused by manual visual inspection and screening of defective products.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a flowchart illustrating a method for detecting an optical filter according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating a method for detecting an optical filter according to an embodiment of the present invention;

FIG. 3 is a block diagram of a three-point bending apparatus according to an embodiment of the present invention.

Detailed Description

The technical scheme in the embodiment of the invention has the following general idea:

and performing three-point bending test on the optical filter by adopting three-point bending equipment to obtain the fracture load and the fracture displacement of the optical filter, and determining the stress strength and the strain strength of the optical filter according to the fracture load, the fracture displacement, the support span of the three-point bending equipment and the size parameters of the optical filter. Therefore, the defective optical filter with insufficient intensity can be accurately screened out.

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The embodiment of the application provides a method for detecting an optical filter, as shown in fig. 1, including:

step S101, performing three-point bending test on the optical filter by adopting three-point bending equipment to obtain the fracture load and the fracture displacement of the optical filter;

step S102, determining the stress intensity of the optical filter according to the fracture load, the support span of the three-point bending equipment and the size parameters of the optical filter;

step S103, determining the strain intensity of the optical filter according to the fracture displacement, the support span of the three-point bending equipment and the size parameters of the optical filter.

The following describes in detail specific implementation steps of the method for detecting an optical filter provided in this embodiment with reference to fig. 1:

in step S101, a three-point bending test is performed on the optical filter by using a three-point bending apparatus to obtain a fracture load and a fracture displacement of the optical filter. The three-point bending device may be a three-point bending device in the prior art, or may be an improved three-point bending device provided in fig. 3 of the present application, which is not limited herein.

Specifically, the implementation method of the three-point bending test comprises the following steps:

as shown in fig. 2, a press rod 201 (which may be a cylindrical press rod, an elliptic cylindrical press rod, or a square cylindrical press rod, but not limited thereto) and a three-point bending jig 202 are prepared, wherein the three-point bending jig 202 includes support structures 2021 (which may be triangular or cylindrical in cross section, but not limited thereto) arranged in pairs, two support structures in each pair of support structures 2021 are arranged at intervals, and the interval distance between the two support structures in each pair of support structures 2021 is a support span. .

The optical filter 203 to be tested is detected before testing, so that the sample to be tested is ensured to be free of damage and fracture, and the test result is prevented from being interfered. The length, width and thickness of the filter 203 to be measured are measured.

The filters 203 to be tested are fixedly placed on the support structures 2021, and the centers of the filters 203 are kept at the centers of each pair of support structures 2021, i.e. the distances between the two sides of the filters 203 beyond the support structures 2021 are kept equal. The specific way of aligning and placing the optical filter 203 may be that a technician manually aligns and places the optical filter, or may use a production line robot provided with a distance detection sensor to align and place the optical filter, which is not limited herein.

The pressing rod 201 is used to press downwards from the central line position of the two supporting structures 2021 until the optical filter 203 is broken. The pressing speed can be set to be 1 mm/min; it can also be set that every time the pressure is pressed down until the pressure at the contact position of the pressure rod 201 and the optical filter 203 reaches 0.1N, the pressure rod 201 moves up to the pressure of 0N, and then the pressure is continued to be pressed down again and again until the optical filter 203 is broken.

The breaking load and the breaking displacement at which the filter 203 breaks are recorded. The breaking load is the maximum pressure strength to which the optical filter 203 is subjected when it breaks, and the breaking displacement is the distance by which the pressed position is lowered relative to the pre-pressed position when the optical filter 203 breaks.

In the implementation, the filter 203 may be rotated and pressed along the width and length directions thereof, respectively, to determine the intensity level at each angle.

Wherein, for the pushing down of more accurate control depression bar 201 to and more accurate record fracture load and fracture displacement, can set up the fixed depression bar 201 of arm or mechanical fixture of taking controller and motor, and drive the constant velocity pushing down of fixed depression bar 201 through controller control motor. Further, a distance sensor and a pressure sensor can be arranged to accurately record the fracture load and the fracture displacement.

In step S102, the stress intensity of the optical filter is determined according to the breaking load, the support span of the three-point bending apparatus, and the size parameters of the optical filter.

Specifically, the stress intensity (in mpa) of the optical filter 203 may be determined by using the formula 3 h 1L/(2 b m), where h1 is the breaking load (in N), L is the support span (in mm), b is the width (in mm) of both ends of the optical filter 203 straddling the three-point bending apparatus, and m is the thickness (in mm) of the optical filter 203. Wherein the support span L is the separation distance of the two support structures of each pair of support structures 2021, as shown in fig. 2. b is the dimension of the filter 203 in the direction along the axis of the strut 201.

After the stress intensity of the optical filter 203 is calculated by using a formula, the stress intensity may be compared with a predetermined stress intensity value to determine whether the optical filter 203 meets the requirement. Preferably, the stress intensity may be determined to be greater than 100 mpa, and if so, the optical filter 203 is determined to be acceptable, and if not, the optical filter 203 is determined to be unacceptable.

In step S103, the strain strength of the optical filter is determined according to the fracture displacement, the support span of the three-point bending apparatus, and the size parameters of the optical filter.

Specifically, the strain strength (in mpa) of the optical filter 203 can be determined using the formula [6 × h2 × m/(L × L) ]/1000000, where h2 is the fracture displacement (in mm), L is the support span (in mm), and m is the thickness (in mm) of the optical filter 203.

After the strain strength of the optical filter 203 is calculated by using a formula, the strain strength can be compared with a preset strain strength value to determine whether the optical filter 203 meets the requirement. Preferably, it is determined whether the strain strength is greater than 2000 mpa, and if so, the optical filter 203 is determined to be acceptable, and if not, the optical filter 203 is determined to be unacceptable.

Preferably, the stress intensity and the strain intensity may be set, and the optical filter 203 is determined to be unqualified as long as one parameter does not meet the preset parameter specification.

Carrying out three-point bending test on the optical filter by adopting three-point bending equipment to obtain the fracture load and the fracture displacement of the optical filter; and the stress intensity and the strain intensity of the optical filter are accurately determined according to the two sets of data by combining the support span of the three-point bending equipment and the size parameters of the optical filter, so that the defective products can be accurately screened out. Thereby avoiding the missing inspection and quality accidents caused by manual visual inspection and screening of defective products.

In some embodiments, the stress intensity and the strain intensity of a batch of optical filters may be tested, and then the test data may be statistically analyzed to determine whether the batch of optical filters is qualified, so as to implement accurate batch detection.

Specifically, the calculation process of the stress intensity and the strain intensity and the comparison process of judging whether the optical filter is qualified according to the stress intensity and the strain intensity may be performed by a separate calculation device, or may be performed by a calculation device integrated on a production line, which is not limited herein.

Based on the same inventive concept, an embodiment of the present invention further provides a three-point bending apparatus, as shown in fig. 3, including: a pressure lever 201 and a three-point bending jig 202;

the three-point bending jig 202 is provided with N pairs of supporting structures 2021, wherein a supporting span of each pair of supporting structures 2021 in the N pairs of supporting structures 2021 is different from supporting spans of other pairs of supporting structures 2021, and N is greater than 1.

By arranging a plurality of pairs of supporting structures 2021 and setting that the supporting span of each pair of supporting structures 2021 is different, the three-point bending jig 202 does not need to be adjusted in position, and only the optical filter to be tested needs to be placed on the different pairs of supporting structures 2021 for three-point bending test, so that the stress strength and the strain strength under different supporting spans can be obtained. The efficiency of the test is improved, has reduced the error of artifical regulation, has guaranteed the accuracy of test.

In some embodiments, the support spans of the N pairs of support structures are increased or decreased progressively along the arrangement direction, and the difference between the support spans of two adjacent pairs of support structures in the N pairs of support structures may be set to be 1.5 mm. For example, assume that there are 4 pairs of supporting structures 2021 on the three-point bending jig 202, and the supporting span of the 4 pairs of supporting structures 2021 can be set to be 2.5mm, 4mm, 5.5mm, and 7mm in sequence, so as to meet the testing requirements of the optical filters with different specifications.

In some embodiments, as shown in fig. 3, a base 2022 may be disposed on the three-point bending jig 202, the N pairs of supporting structures 2021 are fixed on the base 2022, and a fixing structure 2023 is disposed on the base 2022 to stabilize the three-point bending jig 202, so as to prevent movement interference of the jig during the three-point bending test and ensure the accuracy of the test.

The fixing structure 2023 may be a snap structure, or as shown in fig. 3, is a screw hole formed on two sides of the N pairs of supporting structures 2021, and the three-point bending apparatus is fixed to the test platform or the test system by a screw passing through the screw hole.

Since the three-point bending apparatus described in this embodiment is an apparatus corresponding to the method for detecting an optical filter provided in the foregoing embodiment, based on the method for detecting an optical filter described in the foregoing embodiment of the present invention, a person skilled in the art can understand the specific structure, principle and deformation of the apparatus, and thus details are not described herein again.

Based on the same inventive concept, the embodiment of the invention also provides a detection method of the optical filter, which comprises the following steps:

by using the three-point bending apparatus shown in fig. 3 provided in the foregoing description of the embodiments of the present application, the optical filter is detected by the method for detecting the optical filter shown in fig. 1 provided in the foregoing description of the embodiments of the present application.

Through verification, about 6 customer complaints related to the quality of the optical filter exist every year before the optical filter is screened by adopting the detection method of the optical filter and the three-point bending equipment provided by the application. After the optical filter is screened by adopting the detection method of the optical filter and the three-point bending equipment, no customer complaints related to the quality of the optical filter appear in about 1 year. Therefore, by adopting the detection method of the optical filter and the three-point bending equipment provided by the embodiment, the accuracy and hit rate of the detection of the defective products of the optical filter can be effectively improved, and the delivery quality of the related products of the optical filter can be effectively improved.

The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:

according to the detection method of the optical filter and the three-point bending device provided by the embodiment of the invention, the three-point bending test is carried out on the optical filter by adopting the three-point bending device, so that the fracture load and the fracture displacement of the optical filter are obtained; and the stress intensity and the strain intensity of the optical filter are accurately determined according to the two sets of data by combining the support span of the three-point bending equipment and the size parameters of the optical filter, so that the defective products can be accurately screened out. Thereby avoiding the missing inspection and quality accidents caused by manual visual inspection and screening of defective products.

The algorithms and displays presented herein are not inherently related to any particular computer, virtual machine, or other apparatus. Various general purpose systems may also be used with the teachings herein. The required structure for constructing such a system will be apparent from the description above. Moreover, the present invention is not directed to any particular programming language. It is appreciated that a variety of programming languages may be used to implement the teachings of the present invention as described herein, and any descriptions of specific languages are provided above to disclose the best mode of the invention.

In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.

The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components of an apparatus, device, system according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.