PDAF test equipment based on four-station rotating platform

Abstract

A PDAF test device based on a four-station rotating platform is characterized in that the PDAF test device comprises the rotating platform and four test stations, and the four test stations are respectively a station A, a station B, a station C and a station D; the station A is fixedly installed on the rotating platform, the station B, the station C and the station D are located at the circumferential equally-divided positions of the outer side of the rotating platform respectively, each station is provided with an independent functional module, the stations of a tested object are switched through stepping rotation of the rotating platform, and the station A is configured to execute feeding and discharging operation and electrical testing; the station B is configured to execute a near-focus test, a far-focus test and an infinity simulation test of the camera module; the station C is configured to execute a PDAF1 wide-angle test and a black and white field test of the camera module; and the station D is configured to execute burning and PDAF2 testing of the camera module. The rotating platform can synchronously switch a tested object to a B / C / D station, and the test period is shortened by 40%-60% (compared with traditional single-station equipment).

Description

Technical Field

[0001] The present invention relates to the field of camera module testing, and in particular to a PDAF testing device based on a four-station rotating platform. Background Art

[0002] With the continuous upgrading of camera module technology applications and the extensive application of PDAF (phase detection autofocus) technology, the corresponding camera module production process has more and more processes. For example, the test environment of wide-angle production modules has different FOV angles, and the relay lens models used to simulate the distance when setting up the test environment will also be different. The current testing status is: due to problems with the equipment structure, it is impossible to provide the environmental requirements for simultaneous testing of multiple modules and installation of wide-angle relay lenses on multiple channels. The existing PDAF equipment can only complete half of the channel testing requirements due to the limited assembly structure, and it requires a large number of personnel, a long product testing cycle, and is difficult to manage. Summary of the Invention

[0003] In view of the technical defects and technical drawbacks in the prior art, the embodiments of the present invention provide a PDAF test device based on a four-station rotary platform to overcome the above problems or at least partially solve the above problems. The specific solution is as follows:

[0004] A PDAF test device based on a four-station rotating platform includes a rotating platform and four test stations, wherein the four test stations are station A, station B, station C, and station D; station A is fixedly mounted on the rotating platform, and stations B, C, and D are respectively located at equally divided positions on the circumference outside the rotating platform. Each station is configured with an independent functional module, and the station of the object under test is switched by stepping the rotating platform, wherein:

[0005] Station A is configured to perform loading and unloading operations and electrical testing;

[0006] Station B is configured to perform near-focus test, far-focus test and infinity simulation test of the camera module; Station C is configured to perform PDAF1 wide-angle test and black and white field test of the camera module; Station D is configured to perform burning and PDAF2 test of the camera module.

[0007] Furthermore, the A station integrates loading and unloading mechanisms and electrical testing components, and is equipped with a visual positioning system for automatic loading / unloading and power-on detection of the object to be tested.

[0008] Furthermore, the B station includes a far and near focus test module, wherein:

[0009] The close-focus test light source has a size of 650mm x 500mm and a measured distance of 50-300mm. It is driven by an electric module to adjust the distance to the object being measured.

[0010] The telephoto test light source measures 840mm x 800mm, with a measured distance of 300-400mm. It is driven by an electric module to adjust the distance to the object being measured, and is equipped with an RL090DX4 teleconverter to simulate an infinity test scene.

[0011] Furthermore, the far and near focus test light source of the B station adopts a switchable optical component, which supports automatic matching of the light source size and light field parameters according to the test type.

[0012] Furthermore, the C station includes:

[0013] PDAF1 wide-angle test module, light source size is 1050mm × 850mm, the actual measurement distance range is 160-600mm, and the distance to the measured object is manually adjusted;

[0014] The black and white field test module has a light source size of 260mm×220mm, is compatible with the installation of 4 sets of G3C standard light sources, has a test distance of 2-10mm, and is driven by an electric module to adjust the distance to the object being tested.

[0015] Furthermore, the black and white field test module includes a switchable black field light shielding plate and a white field diffuse reflection plate, and the white field light source installation structure supports the rapid replacement of standard OTP light sources.

[0016] Furthermore, the D station includes an OTP burning module and a PDAF2 test module:

[0017] The OTP programming module is equipped with 4 sets of G3C standard light sources, with a test distance of 2-10mm. It is driven by an electric module to adjust the distance to the object being tested.

[0018] The PDAF2 test module is configured with a light source size of 650mm×650mm, and the actual measurement distance is 150-300mm, and the distance to the object being measured is manually adjusted.

[0019] Furthermore, the light source configuration of the OTP burning module at station D is compatible with the physical interface and electrical protocol of the white field light source at station C, supporting cross-station multiplexing of light source modules.

[0020] Furthermore, the device also includes a central control system, which is used to control the rotating platform and the four test stations to perform corresponding operations, including:

[0021] Control station A to perform loading and unloading and electrical testing, and after completing the test at station A, control the rotation of the rotating platform to move the object under test to station B; control station B to perform the near focus test, far focus test and infinity simulation test of the camera module, and after completing the test at station B, control the rotation of the rotating platform to move the object under test to station C; control station C to perform the PDAF1 wide-angle test and black and white field test of the camera module, and after completing the test at station C, control the rotation of the rotating platform to move the object under test to station D;

[0022] Control the burning and PDAF2 test of the D-station camera module. After completing the D-station test, control the rotating platform to return to its original position.

[0023] Furthermore, the central control system includes:

[0024] The motion control module is used to coordinate the timing of the rotation platform and the mechanical devices of each workstation; the data acquisition module collects the test data of each workstation in real time and generates a traceability code; the abnormal alarm module is equipped with an audible and visual alarm and a shutdown protection mechanism;

[0025] The data analysis module analyzes the test data of each workstation. When any workstation fails the test, it will: a) record the fault code and test parameters; b) trigger an audible and visual alarm and suspend the production line;

[0026] c) Generate NG product processing instructions and transfer defective products to a dedicated recycling bin through the loading and unloading mechanism of station A.

[0027] The present invention has the following beneficial effects:

[0028] 1. Improved test efficiency: The rotating platform synchronously switches the test object to the B / C / D station, shortening the test cycle by 40%-60% (compared to traditional single-station equipment);

[0029] 2. Innovation in telephoto simulation: Station B uses the RL090DX4 teleconverter with an 840×800mm light source to simulate an optically infinite scene at a physical distance of 400mm, reducing equipment space usage by over 70%.

[0030] 3. Test accuracy guarantee:

[0031] Electric module drive test distance adjustment (e.g. C station 2-10mm positioning accuracy ±0.02mm);

[0032] Real-time feedback data from the light intensity calibration sensor (sampling frequency ≥ 100 Hz, error ± 0.5% FS);

[0033] CRC-32 redundancy check ensures the integrity of the burned data (bit error rate ≤ 1×10⁻ 6 );

[0034] 4. Multi-scenario coverage capability:

[0035] The wide-angle test light source is 1050×850mm and supports manual adjustment from 160-600mm, covering 160° field of view distortion detection.

[0036] PDAF1 / PDAF2 dual burning modules are independently configured to adapt to the phase focus parameter calibration of modules with different focal lengths;

[0037] Enhanced collaborative control: The central control system uses the EtherCAT bus protocol to achieve millisecond-level synchronization between the rotating platform and the workstation movements (timing deviation ≤ ±10ms), avoiding mechanical interference and data transmission delays. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic structural diagram of a PDAF test device based on a four-station rotary platform provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] refer to Figure 1 As shown, an embodiment of the present invention provides a PDAF test device based on a four-station rotating platform, including a rotating platform and four test stations, wherein the four test stations are station A, station B, station C, and station D; station A is fixedly mounted on the rotating platform, and stations B, C, and D are respectively located at equally divided positions on the circumference outside the rotating platform. Each station is configured with an independent functional module, and the station of the object under test is switched by stepping the rotating platform, wherein:

[0041] Station A is configured to perform loading and unloading operations and electrical testing;

[0042] Station B is configured to perform near-focus test, far-focus test and infinity simulation test of the camera module; Station C is configured to perform PDAF1 wide-angle test and black and white field test of the camera module; Station D is configured to perform burning and PDAF2 test of the camera module.

[0043] In the above embodiment, the rotating platform integrates four workstations (A / B / C / D), and the workstation switching is realized by a stepper motor, among which, workstation A: loading and unloading + electrical test (basic function integration), workstation B: near focus / far focus / infinity test (optical performance verification), workstation C: PDAF1 wide angle + black and white field test (phase focus special test), workstation D: burning + PDAF2 test (data writing and secondary verification). The four workstations work together to realize full-process automated testing, covering full-dimensional detection of camera modules from basic electrical properties to complex optical performance.

[0044] In some embodiments, the A station integrates a loading and unloading mechanism and an electrical testing component, and is equipped with a visual positioning system for automatic loading / unloading and power-on detection of the object to be tested, wherein the loading and unloading mechanism can be optionally a loading and unloading robotic arm.

[0045] In the above embodiment, the visual positioning system provides accuracy assurance, the integrated design of the electrical test components reduces the footprint, and millimeter-level positioning accuracy is achieved through visual positioning. High-precision loading and unloading is completed in conjunction with the robotic arm, avoiding deviations caused by human intervention.

[0046] In some embodiments, the B station includes a near and far focus test module, wherein:

[0047] The close-focus test light source has a size of 650mm x 500mm and a measured distance of 50-300mm. It is driven by an electric module to adjust the distance to the object being measured.

[0048] The telephoto test light source measures 840mm x 800mm, with a measured distance of 300-400mm. It is driven by an electric module to adjust the distance to the object being measured, and is equipped with an RL090DX4 teleconverter to simulate an infinity test scene.

[0049] Among them, the far and near focus test light source of the B station adopts a switchable optical component, which supports automatic matching of the light source size and light field parameters according to the test type.

[0050] In the above embodiment, the parameters of the near-focus (650×500mm@50-300mm) and far-focus (840×800mm@300-400mm) light sources are clearly defined. The RL090DX4 teleconverter simulates infinity, and the switchable optical components achieve automatic matching of the light source parameters. The motorized module drive ensures dynamic adjustment of the test distance (with ±0.1mm repeatability). The teleconverter eliminates air refraction errors, complying with the ISO 12233 test standard. The light source switching time is less than 2s, improving test efficiency by 30%.

[0051] In some embodiments, the C station includes:

[0052] PDAF1 wide-angle test module, light source size is 1050mm × 850mm, the actual measurement distance range is 160-600mm, and the distance to the measured object is manually adjusted;

[0053] The black and white field test module has a light source size of 260mm×220mm, is compatible with the installation of 4 sets of G3C standard light sources, has a test distance of 2-10mm, and is driven by an electric module to adjust the distance to the object being tested.

[0054] The black and white field test module includes a switchable black field shading plate and a white field diffuse reflection plate, and the white field light source installation structure supports the rapid replacement of standard OTP light sources.

[0055] In the above embodiment, the PDAF1 wide-angle test is manually adjusted to accommodate a wide range of focal lengths, and the black and white field test is fine-tuned by an electric module, which can achieve 2-10mm precision control.

[0056] Black field mask (<0.1% reflectivity)

[0057] White field diffuse reflection plate (98% reflectivity) and OTP light source quick replacement structure (≤5s module replacement) meet the needs of multi-batch production.

[0058] In some embodiments, the D station includes an OTP programming module and a PDAF2 test module:

[0059] The OTP programming module is equipped with 4 sets of G3C standard light sources, with a test distance of 2-10mm. It is driven by an electric module to adjust the distance to the object being tested.

[0060] The PDAF2 test module is configured with a light source size of 650mm×650mm, and the actual measurement distance is 150-300mm, and the distance to the object being measured is manually adjusted.

[0061] Among them, the light source configuration of the OTP burning module at the D station is compatible with the physical interface and electrical protocol of the white field light source at the C station, supporting the reuse of light source modules across stations.

[0062] In the above embodiment, the D-station OTP burning and PDAF2 test are collaboratively designed, and the OTP burning module reuses the C-station light source interface to reduce equipment complexity. The PDAF2 test light source size is 650×650mm, the distance is manually adjusted (150-300mm), and secondary calibration verification is supported.

[0063] In some embodiments, the device further includes a central control system, which is used to control the rotating platform and the four test stations to perform corresponding operations, including:

[0064] Control station A to perform loading and unloading and electrical testing, and after completing the test at station A, control the rotation of the rotating platform to move the object under test to station B; control station B to perform the near focus test, far focus test and infinity simulation test of the camera module, and after completing the test at station B, control the rotation of the rotating platform to move the object under test to station C; control station C to perform the PDAF1 wide-angle test and black and white field test of the camera module, and after completing the test at station C, control the rotation of the rotating platform to move the object under test to station D;

[0065] Control the burning and PDAF2 test of the D-station camera module. After completing the D-station test, control the rotating platform to return to its original position.

[0066] Wherein, the central control system includes:

[0067] The motion control module is used to coordinate the timing of the rotation platform and the mechanical devices of each workstation; the data acquisition module collects the test data of each workstation in real time and generates a traceability code; the abnormal alarm module is equipped with an audible and visual alarm and a shutdown protection mechanism;

[0068] The data analysis module analyzes the test data of each workstation. When any workstation fails the test, it will: a) record the fault code and test parameters; b) trigger an audible and visual alarm and suspend the production line;

[0069] c) Generate NG product processing instructions and transfer defective products to a dedicated recycling bin through the loading and unloading mechanism of station A.

[0070] In the above embodiment, the central control system realizes millisecond-level synchronization between the rotating platform and the workstation motion (timing deviation ≤ ±10ms) based on the EtherCAT bus protocol, thereby avoiding mechanical interference and data transmission delay.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A PDAF test device based on a four-station rotating platform, characterized in that: It includes a rotating platform and four test stations, namely station A, station B, station C and station D; station A is fixedly installed on the rotating platform, and stations B, C and D are respectively located at equally divided positions on the circumference outside the rotating platform. Each station is equipped with an independent functional module, and the station of the object under test is switched by the stepping rotation of the rotating platform, wherein: Station A is configured to perform loading and unloading operations and electrical testing; Station B is configured to perform near-focus test, far-focus test and infinity simulation test of the camera module; Station C is configured to perform PDAF1 wide-angle test and black and white field test of the camera module; Station D is configured to perform burning and PDAF2 test of the camera module.

2. The PDAF test equipment based on a four-station rotary platform according to claim 1, characterized in that: The A station integrates loading and unloading mechanisms and electrical testing components, and is equipped with a visual positioning system for automatic loading / unloading and power-on detection of the object to be tested.

3. The PDAF test equipment based on a four-station rotary platform according to claim 1, characterized in that: The B station includes a focus test module, wherein: The close-focus test light source has a size of 650mm x 500mm and a measured distance of 50-300mm. It is driven by an electric module to adjust the distance to the object being measured. The telephoto test light source measures 840mm x 800mm, with a measured distance of 300-400mm. It is driven by an electric module to adjust the distance to the object being measured, and is equipped with an RL090DX4 teleconverter to simulate an infinity test scene.

4. The PDAF test equipment based on a four-station rotary platform according to claim 3, characterized in that: The far and near focus test light source of the B station adopts a switchable optical component, which supports automatic matching of the light source size and light field parameters according to the test type.

5. The PDAF test equipment based on a four-station rotary platform according to claim 1, characterized in that: The C station includes: PDAF1 wide-angle test module, light source size is 1050mm × 850mm, the actual measurement distance range is 160-600mm, and the distance to the measured object is manually adjusted; The black and white field test module has a light source size of 260mm×220mm, is compatible with the installation of 4 sets of G3C standard light sources, has a test distance of 2-10mm, and is driven by an electric module to adjust the distance to the object being tested.

6. The PDAF test equipment based on a four-station rotary platform according to claim 5, characterized in that: The black and white field test module includes a switchable black field light shielding plate and a white field diffuse reflection plate, and the white field light source installation structure supports the rapid replacement of standard OTP light sources.

7. The PDAF test equipment based on a four-station rotary platform according to claim 1, characterized in that: The D station includes an OTP programming module and a PDAF2 test module: The OTP programming module is equipped with 4 sets of G3C standard light sources, with a test distance of 2-10mm. It is driven by an electric module to adjust the distance to the object being tested. The PDAF2 test module is configured with a light source size of 650mm×650mm, and the actual measurement distance is 150-300mm, and the distance to the object being measured is manually adjusted.

8. The PDAF test equipment based on a four-station rotary platform according to claim 7, characterized in that: The light source configuration of the OTP burning module at the D station is compatible with the physical interface and electrical protocol of the white field light source at the C station, supporting cross-station multiplexing of the light source module.

9. The PDAF test equipment based on a four-station rotary platform according to claim 1, characterized in that: The equipment also includes a central control system, which is used to control the rotating platform and the four test stations to perform corresponding operations, including: Control station A to perform loading and unloading and electrical testing, and after completing the test at station A, control the rotation of the rotating platform to move the object under test to station B; control station B to perform the near focus test, far focus test and infinity simulation test of the camera module, and after completing the test at station B, control the rotation of the rotating platform to move the object under test to station C; control station C to perform the PDAF1 wide-angle test and black and white field test of the camera module, and after completing the test at station C, control the rotation of the rotating platform to move the object under test to station D; Control the burning and PDAF2 test of the D-station camera module. After completing the D-station test, control the rotating platform to return to its original position.

10. The PDAF test equipment based on a four-station rotary platform according to claim 9, characterized in that: The central control system comprises: The motion control module is used to coordinate the timing of the rotation platform and the mechanical devices of each workstation; the data acquisition module collects the test data of each workstation in real time and generates a traceability code; the abnormal alarm module is equipped with an audible and visual alarm and a shutdown protection mechanism; The data analysis module analyzes the test data of each workstation. When any workstation fails the test, it will: a) record the fault code and test parameters; b) trigger an audible and visual alarm and suspend the production line; c) Generate NG product processing instructions and transfer defective products to a dedicated recycling bin through the loading and unloading mechanism of station A.

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