CN100405036C - Method for testing and adjusting optical assembly - Google Patents

Abstract

The invention relates to a method for testing and adjusting an optical component, which comprises the following steps: detecting the position of the central point of the optical sensor and the position of the central point of the lens; (b) aligning the optical sensor with the center point of the lens and fixing the lens mount on the second circuit board; (c) placing the optical assembly on a moving platform of a testing device; (d) moving the moving platform to align the optical assembly with the central point of a test chart of the test device; (f) performing image test and analysis; (g) clamping the lens in the lens mount by a focusing tool of the testing device, and adjusting the focal range of the lens according to the image testing result; and (h) fixing the focal length of the lens to complete the testing and adjustment of the optical assembly. The invention can improve the test accuracy and the image quality of the optical component, avoid the problem of test misjudgment caused by shaking the optical component during moving, and improve the test and adjustment efficiency of the optical component.

Description

Optical components testing and adjustment methods

technical field

The invention relates to a testing and adjusting method, in particular to a testing and adjusting method of an optical component.

Background technique

The principle of the image capture device is to use light to shine on the object to capture the image, and after the light is reflected back, it is received by the optical components in the image capture device, and the optical signal is converted into an analog signal, and finally converted into a displayable , edited, stored and output digital signal format to be displayed by a display device or printed by a printing device.

FIG. 1 is an exploded view of an optical component structure of an image capture device. The optical assembly 1 mainly includes a first circuit board 10 , an optical sensor 11 , a lens holder 12 , a lens 13 and a second circuit board 14 , wherein various electronic components 101 are arranged on the top surface of the first circuit board 10 . The light sensor 11 is a charge coupled device (CCD), a complementary metal oxide semiconductor sensor (CMOS sencor) or other photosensitive elements. The side of the light sensor 11 is provided with a plurality of contact terminals 111 , and the contact terminals 111 can be electrically connected to the holes 102 of the first circuit board 10 . The lens holder 12 is composed of a rectangular frame 121 and a cylindrical ring frame 122 extending upward from the frame 121 , and the ring frame 122 can accommodate the lens 13 inside it. A spacer plate 123 is formed between the frame 121 and the ring frame 122 , and a through hole 124 is defined at the center of the spacer plate 123 . An accommodating chamber 125 is provided inside the frame 121, and the accommodating chamber 125 can accommodate the electronic components 101 and the light sensor 11 arranged on the first circuit board 10, and the bottom area of the frame 121 is the same as the area of the first circuit board 10 Basically equal. The frame 121 is extended with a plurality of positioning pins 126, and the second circuit board 14 is provided with a plurality of corresponding positioning holes 141. After the positioning pins 126 of the frame 121 are fixed in the positioning holes 141 of the second circuit board 14, The combination of the lens holder 12 and the lens 13 is fixed on the second circuit board 14 to form the optical assembly 1 .

Since the optical component 1 is an important key to determine the quality of captured images in the image capture device, multiple tests and adjustments will be performed on the optical component 1, such as electrical tests, modulus transfer function (Modulation Transfer Function, MTF) tests and Focus adjustment, image quality test, etc., to ensure the image quality of the optical component 1 . FIG. 2 is a flow chart of a method for performing modulus transfer function (Modulation Transfer Function, MTF) testing and focal length adjustment of an optical component in a conventional manner. As shown in Figure 2, when carrying out the modulus transfer function (Modulation Transfer Function, MTF) test and focus adjustment of the optical component 1, first the optical component 1 after the assembly is placed in the modulus transfer function (MTF) testing instrument, Such as step S11. Then, the optical assembly 1 is moved under a test chart (Test chart), as in step S12. Then, the optical component 1 is used to capture the image of the test pattern, and the MTF analysis of the optical component 1 is performed. Afterwards, it is judged whether the image quality of the optical component 1 is normal according to the acquired data and graph, as in step S14. If it is judged that the image quality of the optical component 1 is not normal, the optical component is disassembled, the focal length is adjusted or the optical component is replaced according to step S15, and then the previous test is repeated. If it is judged that the image quality of the optical component 1 is normal, the subsequent testing and adjustment procedure is continued, such as step S16.

However, since the current optical sensor 11 is arranged on the first circuit board 10 with surface mount technology (SMT), the central point of the optical sensor 11 will be different from the surface mount technology and the external shape of the lens holder 12. The center point of the lens 13 is shifted or out of alignment, which affects the test accuracy and image quality of the optical component 1 . Furthermore, the optical component 1 is positioned by the positioning hole 141 on the second circuit board 14 and the positioning foot 126 of the lens holder 12, so the optical sensor 11 and the lens 13 on the lens holder 12 are also easily affected by tolerance factors and affect the accuracy of the test. and image capture quality. In addition, when the optical component 1 is moved for testing, the optical component 1 will vibrate during the movement, which will cause test misjudgment and affect product quality. Furthermore, traditional testing methods and equipment cannot directly adjust the focal length range of the lens 13 according to the test results, which causes inconvenience in testing and adjustment.

In view of the lack of the above-mentioned conventional technologies, how to efficiently test and adjust optical components and avoid misjudgments caused by other external factors is an urgent problem for relevant practitioners to solve.

Contents of the invention

The main purpose of the present invention is to provide a test and adjustment method for optical components, so as to improve the existing test method. Because the center point of the optical sensor will be due to surface mount technology printing and the tolerance factors of the parts of the lens holder, which will affect the optics. Component test accuracy and image quality.

Another object of the present invention is to provide a testing method for an optical component, so as to solve the problem in the prior art that when the optical component is moved for testing, the optical component vibrates during the movement, resulting in test misjudgment.

To achieve the above object, according to one aspect of the present invention, a method for testing and adjusting an optical component is provided, wherein the optical component has a lens holder, a lens, a light sensor, a first circuit board and a second circuit board, the The light sensor is arranged on the first circuit board, the first circuit board is arranged on the second circuit board, and the lens is arranged in the lens seat. The method of the present invention comprises the steps of: (a) detecting the position of the center point of the optical sensor and the position of the center point of the lens; (b) aligning the position of the center point of the light sensor and the lens, and fixing the lens seat on the second circuit board; (c) placing the optical component on a mobile platform of a test device; (d) moving the mobile platform so that the optical component is aligned with the center point of a test chart of the test device; (f) performing image testing and analysis; ( g) Clamp the lens set in the lens holder with a focusing tool of the test device, and adjust the focal length range of the lens according to the image test result; and (h) fix the focal length of the lens to complete the test and adjustment of the optical component.

According to the idea of the present invention, the light sensor is an electrical coupling element or a complementary metal oxide semiconductor sensor.

According to the concept of the present invention, the step (b) is to fix the lens mount on the second circuit board by glue.

According to the idea of the present invention, the step (c) further includes the step (c1) using a fixture of the test device to make the optical component close to one side of the moving platform.

According to the idea of the present invention, the testing device is a modulus transfer function testing device.

According to the idea of the present invention, wherein step (f) is to carry out modulus transfer function test.

According to the idea of the present invention, the step (h) is to fix the lens on the lens holder by glue.

In order to achieve the above object, according to another aspect of the present invention, a method for testing the focal length of an optical component is provided, wherein the optical component has a lens holder, a lens, a light sensor, a first circuit board and a second circuit board, The light sensor is arranged on the first circuit board, the first circuit board is arranged on the second circuit board, the lens is arranged in the lens seat, and the lens seat is arranged on the second circuit board. The method of the present invention comprises the steps of: (a) placing the optical assembly on a mobile platform of a test device; (b) moving the mobile platform so that the optical assembly is in alignment with a center point of a test chart of the test device; (c) Carry out image testing and analysis; (d) clamp the lens set in the lens holder with a focusing device of the test device, and adjust the focal length range of the lens according to the image test result; and (e) fix the focal length of the lens to complete the optical Component testing and tuning.

Description of drawings

FIG. 1 is an exploded view of an optical component structure of an image capture device.

FIG. 2 is a flow chart of a method for performing modulus transfer function testing and focal length adjustment of an optical component in a conventional manner.

FIG. 3 is an exploded view of an exemplary optical component structure implementing the method for testing and adjusting the optical component of the present invention.

FIG. 4 is a flowchart of a method for testing the modulus transfer function and adjusting the focal length of the optical component in the manner of the present invention.

Figure 5(a)~(c) are schematic structural diagrams of the process steps shown in Figure 4.

Detailed ways

Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the description in the following paragraphs. It should be understood that the invention is capable of various changes in different aspects without departing from the scope of the invention, and that the description and illustrations therein are illustrative in nature and not limiting. this invention.

Please refer to FIG. 3 , which is an exploded view of an exemplary optical component structure implementing the method for testing and adjusting the optical component of the present invention. The exemplary optical assembly 2 mainly includes a first circuit board 20, an optical sensor 21, a lens holder 22, a lens 23 and a second circuit board 24, wherein various electronic components are arranged on the top surface of the first circuit board 20. 201. The light sensor 21 is a charge coupled device (CCD), a complementary metal oxide semiconductor sensor (CMOS sencor) or other photosensitive elements. A plurality of contact terminals 211 are disposed on a side of the light sensor 21 , and the contact terminals 211 can be electrically connected to the holes 202 of the first circuit board 20 . The lens holder 22 is composed of a rectangular frame 221 and a cylindrical ring frame 222 extending upward from the frame 221 , and the ring frame 222 can accommodate the lens 23 inside it. A spacer plate 223 is formed between the frame 221 and the ring frame 222 , and a through hole 224 is defined at the center of the spacer plate 223 . Inside the frame 221, there is an accommodating chamber 225. This accommodating chamber 225 can accommodate the electronic components 201 and the light sensor 21 arranged on the first circuit board 20, and the bottom area of the frame 221 is the same as the area of the first circuit board 20. Basically equal. After the frame 221 is fixed on the second circuit board 24 by glue (not shown), the combination of the lens holder 22 and the lens 23 can be fixed on the second circuit board 24 to form the optical component 2 .

Similarly, since the optical component 2 is an important key to determine the image quality of the image capture device, a number of tests and adjustments must be performed on the optical component 2, such as electrical testing, modulus transfer function (Modulation Transfer Function, MTF) test, focus adjustment, image quality test, etc., to ensure the image quality of the optical component 2. Fig. 4 is the flow chart of the method for testing the modulus transfer function (Modulation Transfer Function, MTF) of the optical component and adjusting the focal length in the present invention. As shown in Figure 4, when performing the modulus transfer function (Modulation Transfer Function, MTF) test and focus adjustment of the optical assembly, first perform step S21, detect the center point position of the optical sensor 21 and detect the position fixed in the lens holder 22 The center point position of the lens 23. Then, as shown in FIG. 5( a), the center point positions of the optical sensor 21 and the lens 23 fixed in the lens holder 22 are aligned, and the lens holder 22 is positioned on the second circuit board 24 with glue 25 , so that the optical sensor 21 and the lens 23 are accurately aligned. This step can avoid the impact of tolerance caused by the external dimensions of the light sensor 21 and the lens holder 22 provided by the surface mount technology, and improve the image quality.

Then, proceed to step S22, place the assembled optical assembly 2 on the mobile platform of the MTF testing device, and clamp the optical assembly 2 by a clamp so that it is close to one side of the mobile platform, so as to increase the follow-up focus adjustment steps The stability makes the production line easy to operate, as shown in Figure 5(b). Afterwards, step S23 is performed to move the mobile platform 31 of the MTF testing device so that the lens of the optical component is aligned with the center point of the test chart 32 to perform MTF analysis, as shown in FIG. 5( c ). Then, proceed to step S24, clamp the lens 23 arranged in the lens holder 22 with a focusing tool 33, and rotate or move the focusing tool 33 according to the MTF analysis result, so that the lens 23 in the lens holder 22 is fixed by the focusing tool. 33 to move up or down along the threads of the two wall surfaces to adjust the focal length range of the lens 23 until it reaches the optimal MTF position. Afterwards, step S25 is performed to glue and position the lens 23 of the optical assembly 2 with the adjusted focal length on the lens holder 22 to complete the test and adjustment of the optical assembly 2 .

In summary, the optical component testing and adjustment method of the present invention can improve the existing testing method because the center point of the optical sensor will have tolerance factors due to surface mount technology printing and the shape relationship of the parts of the lens holder, which will affect the optical component. Test accuracy and image quality. In addition, it can also solve the existing problem of misjudgment caused by the vibration of the optical component when moving the optical component for testing. In addition, the method of the present invention can increase the testing and adjusting efficiency of the optical components, and can effectively increase the production capacity.

Claims (7)

1. the test of an optical module and method of adjustment, wherein this optical module has a lens mount, lens, an optical sensor, a first circuit board and a second circuit board, this optical sensor is arranged on this first circuit board, this first circuit board is arranged on this second circuit board, these lens are arranged in this lens mount, and this method comprises:

Step a detects the center position of this optical sensor and the center position of these lens;

Step b makes the center position contraposition of this optical sensor and these lens, and fixes this lens mount on this second circuit board;

Step c places this optical module on the mobile platform of one proving installation;

Steps d moves this mobile platform, makes the center position contraposition of a test pattern of this optical module and this proving installation;

Step f carries out image test and analysis;

Step g is arranged at these lens in this lens mount with a focusing apparatus clamping of this proving installation, and adjusts the focal range of these lens according to the image test result; And

Step h fixes the focal length of these lens, with test and the adjustment of finishing this optical module.

2. the test of optical module as claimed in claim 1 and method of adjustment is characterized in that this optical sensor is charge coupled device or complementary metal oxide semiconductor transducer.

3. the test of optical module as claimed in claim 1 and method of adjustment is characterized in that this step b fixes this lens mount on this second circuit board by viscose.

4. the test of optical module as claimed in claim 1 and method of adjustment is characterized in that this step c also comprises step c1, utilize anchor clamps of this proving installation in this step c1, and a side of this optical module and this mobile platform is close to.

5. the test of optical module as claimed in claim 1 and method of adjustment is characterized in that this proving installation is the modulation transfer functions proving installation.

6. the test of optical module as claimed in claim 5 and method of adjustment is characterized in that this step f is for carrying out the modulation transfer functions test.

7. the test of optical module as claimed in claim 1 and method of adjustment is characterized in that this step h fixes these lens in this lens mount by viscose, thereby fix the focal length of these lens.

Images