Mobile phone lens module defect detection device and detection method

Abstract

The present invention relates to the field of automated detection technology, and discloses a mobile phone lens module defect detection device, including a nozzle unit, a light source device and a detection module, wherein the light source device emits light to the nozzle unit, and the nozzle unit emits light after being irradiated by the light, and irradiates the mobile phone lens module adsorbed on the nozzle unit, and the detection module performs defect detection on the mobile phone lens module adsorbed on the nozzle unit. The nozzle unit includes a nozzle body and a nozzle below the nozzle body, and the nozzle body is a conical structure of a transparent material, and the nozzle is located at the center of the bottom surface of the conical structure. The side of the conical structure is designed with a plurality of total reflection microprisms at a certain angle, and the total reflection microprisms are arranged in an array. The bottom surface of the conical structure is designed with a plurality of diffuse reflection microlenses, and the diffuse reflection microlenses are arranged in an array. The present invention also discloses a corresponding detection method. The present invention can detect multiple defect items by imaging the mobile phone lens module once, thereby improving detection efficiency and saving detection time.

Description

Technical Field

[0001] The present invention relates to the field of automated detection technology, and in particular to a mobile phone lens module defect detection device and a detection method. Background Art

[0002] The existing method for defect detection of mobile phone lens modules is manual or camera detection, which places the module under light for local and overall inspection.

[0003] Due to lighting conditions, a comprehensive test could not be performed at one time and the test results were unsatisfactory. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems and to provide a mobile phone lens module defect detection device and detection method, which can detect multiple defect items by imaging the mobile phone lens module once, thereby improving detection efficiency and saving detection time.

[0005] The technical solution adopted by the present invention is:

[0006] A mobile phone lens module defect detection device, characterized in that it includes a nozzle unit, a light source device and a detection module, the light source device emits light to the nozzle unit to irradiate the mobile phone lens module adsorbed on the nozzle unit, the detection module performs defect detection on the mobile phone lens module adsorbed on the nozzle unit, the nozzle unit includes a nozzle body and a nozzle below the nozzle body, the nozzle body is a conical structure of transparent material, the nozzle is located at the center of the bottom surface of the conical structure, the side surface of the conical structure is designed with a plurality of total reflection microprisms at a certain angle, the total reflection microprisms are arranged in an array, the light emitted by the light source device is refracted by the side surface of the conical structure on the same side of the nozzle body, and then reflected by the total reflection microprism on the side surface of the conical structure on the opposite side, and then vertically irradiated to the bottom surface of the conical structure, the bottom surface of the conical structure is designed with a plurality of diffuse reflection microlenses, the diffuse reflection microlenses are arranged in an array, and the light vertically irradiated to the bottom surface of the conical structure forms diffuse light after passing through the diffuse reflection microlenses, and evenly irradiates the mobile phone lens module.

[0007] Furthermore, the nozzle unit also includes a through hole arranged in the middle position inside the nozzle body, the lower end of the through hole is connected to the nozzle, and the upper end is connected to the suction device through an air pipe, and the nozzle generates negative pressure to adsorb the mobile phone lens module.

[0008] Further, the nozzle unit is mounted on a rotating mechanism, and the rotating mechanism is mounted on a moving mechanism.

[0009] Furthermore, the light source device includes a collimated LED light source, which is arranged on a light source bracket, and irradiates collimated light at a certain angle toward the nozzle body.

[0010] Furthermore, there are two collimated LED light sources, which are symmetrically arranged on both sides of the nozzle body.

[0011] Furthermore, the detection module includes an annular LED light source and a reflector arranged below the nozzle body, a coaxial LED light source is arranged on one side of the reflector, and a telecentric lens and a CMOS image acquisition camera are arranged on the optical path behind the coaxial LED light source.

[0012] Furthermore, the annular LED light source is arranged concentrically with the suction nozzle.

[0013] Furthermore, a reflector is arranged below the light path of the annular LED light source, and the reflector forms an angle of 45° with the light path.

[0014] A method for detecting defects in a mobile phone lens module, the above-mentioned mobile phone lens module defect detection device, is characterized in that it comprises the following steps:

[0015] (1) The nozzle unit sucks the mobile phone lens module through the negative pressure of the suction head;

[0016] (2) The nozzle unit moves to the light source device position, and the collimated LED light source emits light to the nozzle body;

[0017] (3) After the light is refracted by the nozzle body, it is reflected by the total reflection microprism, and then transmitted by the diffuse reflection microlens to diffuse the mobile phone lens module;

[0018] (4) The annular LED light source is arranged concentrically with the nozzle, emitting light from below to the mobile phone lens module;

[0019] (5) The coaxial LED light source emits light to the 45° reflector, and the light is reflected vertically upward to the mobile phone lens module;

[0020] (6) The light irradiated on the mobile phone lens module returns along the optical path, is received by the telecentric lens, and is focused onto the CMOS camera sensor to form an image.

[0021] Furthermore, steps (2), (4) and (5) are performed simultaneously.

[0022] The beneficial effects of the present invention are:

[0023] (1) After reflection and scattering of the light path, the nozzle head emits light evenly;

[0024] (2) The visual inspection device can perform multiple inspections on the mobile phone lens module, avoiding the need to adsorb the mobile phone lens module to different inspection positions for inspection, reducing the number of inspection stations and inspection time, and improving inspection efficiency;

[0025] (3) Placing the LED light source outside the nozzle head reduces the size of the nozzle head and facilitates nozzle head replacement, thereby reducing replacement costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Attached Figure 1 It is a schematic diagram of the structure of the detection device of the present invention;

[0027] Attached Figure 2 Yes Figure 1 A cross-sectional schematic diagram of

[0028] Attached Figure 3 This is the optical path principle diagram of the microstructure on the nozzle body;

[0029] Attached Figure 4 is a schematic diagram of light path simulation of the present invention;

[0030] Attached Figure 5 This is a comparison chart of the actual test of the mobile phone lens module with and without backlight.

[0031] The reference numerals in the accompanying drawings are:

[0032] 1. Nozzle unit; 2. Light source device;

[0033] 3. Detection module; 4. Nozzle body;

[0034] 5. Suction nozzle; 6. Rotating shaft;

[0035] 7. Air pipe joint; 8. X-axis slide plate;

[0036] 9. Total reflection micro prism; 10. Diffuse reflection micro lens;

[0037] 11. Collimated LED light source; 12. Ring LED light source;

[0038] 13. Half-reflecting half-mirror; 14. Reflecting mirror;

[0039] 15. Coaxial LED light source; 16. Telecentric lens;

[0040] 17.CMOS image acquisition camera; 18.Light source bracket. DETAILED DESCRIPTION

[0041] The specific implementation methods of the mobile phone lens module defect detection device and detection method of the present invention are described in detail below with reference to the accompanying drawings.

[0042] See attached Figure 1 , 2The mobile phone lens module defect detection device mainly includes three parts, namely a nozzle unit 1, a light source device 2 and a detection module 3. The light source device 2 emits light to the nozzle unit 1 to irradiate the mobile phone lens module adsorbed on the nozzle unit 1, and the detection module 3 performs defect detection on the mobile phone lens module adsorbed on the nozzle unit 1.

[0043] The nozzle unit 1 includes a nozzle body 4 and a nozzle 5 below the nozzle body 4. The nozzle body 4 is a conical structure made of transparent material. The nozzle 5 is located at the center of the bottom surface of the conical structure. The nozzle body 4 is made of organic glass. The nozzle body 4 is connected to the rotating shaft 6. The center of the rotating shaft 6 is a hollow structure. A through hole is set in the middle of the nozzle body 4. The rotating shaft 6 is connected to an air pipe joint 7, which is concentric with the through hole in the center of the nozzle body 4. The nozzle 5 is installed at the lower end of the through hole in the center of the nozzle body 4. The air pipe joint 7 is connected to the hollow structure in the center of the rotating shaft 6 from the side of the rotating shaft 6 and is connected to an air suction device (not shown in the figure) through an air pipe at the other end. When the air suction device inhales, suction is generated at the nozzle 5, which can suck the mobile phone lens module.

[0044] The rotating shaft 6 is nested in an X-axis slide 8. The X-axis slide 8 is connected to an X-axis moving mechanism (not shown in the figure). The X-axis moving mechanism can drive the X-axis slide 8 to move along the X-axis, and at the same time drive the rotating shaft 6 nested in the X-axis slide 8 and the suction nozzle body 4 connected to the rotating shaft 6 to move along the X-axis.

[0045] See attached Figure 3 The nozzle body 4 is a conical light-curving structure with a designed taper of 0.094. A plurality of total-reflection microprisms 9 at a certain angle are designed on the side of the conical light-curving structure. The total-reflection microprisms 9 are arranged in an array. The light emitted by the light source device 2 is refracted by the side surface of the nozzle body 4 on the same side, and then reflected by the total-reflection microprism 9 on the opposite side, and then vertically emitted to the bottom surface of the conical structure.

[0046] The total reflection microprism 9 is composed of a large number of microprisms with a length and width of 0.0877 mm, a height of 0.009 mm, and an angle of 45°, which are evenly arranged at a certain interval. The light irradiated to the total reflection microprism 9 is totally reflected due to the external structure of the total reflection microprism 9 and cannot be emitted from the inside of the nozzle body 4. The light direction is changed again inside the nozzle body 4. The light that changes direction inside the nozzle body 4 irradiates the bottom surface of the conical structure of the nozzle body 4 vertically downward.

[0047] The bottom surface of the conical structure of the nozzle body 4 is designed with multiple diffuse reflection micro lenses 10, which are arranged in an array. The light vertically irradiated to the bottom surface of the conical structure forms diffuse light after passing through the diffuse reflection micro lenses 10, and evenly irradiates the mobile phone lens module.

[0048] The diffuse reflection microlens 10 is composed of a plurality of spherical microlenses with a radius of 0.505 mm and a spherical height of 0.0409 mm that are evenly arranged at a certain interval and convex inward. The light irradiated to the diffuse reflection microlens 10 structure is refracted due to the external structure of the diffuse reflection microlens 10 and irradiated from the inside of the nozzle body 4. The emitted light is no longer collimated, but diffuse light irradiated in different directions.

[0049] See the attached Figure 1 , 2 The light source of the light source device 2 includes a collimated LED light source 11, which is arranged on a light source bracket 18, and the collimated LED light source 11 irradiates collimated light of a certain angle to the nozzle body 4. There are two collimated LED light sources 11, which are symmetrically arranged on both sides of the nozzle body 4.

[0050] The collimated LED light source 11 is symmetrically installed at a fixed position on both sides of the detection position at an inclined angle of 30° on the light source bracket 18. The nozzle body 4 is moved to the middle of the two collimated LED light sources 11. At this time, the collimated LED light source 11 works and irradiates collimated light to the nozzle body 4. The collimated light emitted by the collimated LED light source 11 irradiates the conical light bending structure on the nozzle body 4, and the light at the conical light bending structure 11 is refracted and changes direction to enter the inside of the nozzle body 4.

[0051] Part of the diffused light emitted by the nozzle body 4 hits the mobile phone lens module adsorbed on the nozzle body 4, and part of it hits the detection module 3 below. Since the mobile phone lens module blocks part of the diffused light, the image collected by the visual detection module 3 shows a high-contrast image of the mobile phone lens module, highlighting the shape of the mobile phone lens module and the outline of the central through hole.

[0052] The detection module 3 includes an annular LED light source 12 disposed below the nozzle body 4 and a coaxial LED light source 15 on the test light path. A reflector 14 is disposed below the light path of the annular LED light source 12, and the reflector 14 is at a 45° angle to the light path. A telecentric lens 16 and a CMOS image acquisition camera 17 are disposed on the light path behind the coaxial LED light source 15.

[0053] When the nozzle body 4 is moved to the middle of the collimated LED light source 11 and the collimated LED light source 11, the collimated LED light source 11 and the collimated LED light source 11 work to irradiate collimated light to the nozzle body 4. At the same time, the annular LED light source 12 and the coaxial LED light source 15 placed under the nozzle body 4 also work simultaneously.

[0054] The working state of the annular LED light source 12 and the coaxial LED light source 15 depends on the defect detection items that the mobile phone lens module needs to detect. For different defect detection items, the annular LED light source 12 or the coaxial LED light source 15 can be operated separately, or the annular LED light source 12 and the coaxial LED light source 15 can be operated at the same time.

[0055] The annular LED light source 12 is placed on the light source bracket 18. When the nozzle body 4 moves to the detection position, the nozzle body 4 and the annular LED light source 12 are in a concentric position relationship. The LED lamp beads on the annular LED light source 12 are arranged in a 45° ring, forming a ring to irradiate light to the mobile phone lens module. The annular irradiated light irradiates the mobile phone lens module, which can illuminate specific defect features and present a high-contrast image.

[0056] The coaxial LED light source 15 is placed on the left side of the reflector 14, and the reflector 14 is placed at 45° just below the annular LED light source 12. The internal LED lamp beads of the coaxial LED light source 15 are fixed to the top surface of the light source cover, and the LED lamp beads irradiate light downward. The 50% / 50% half-reflective half-mirror 13 is located below the LED lamp beads and fixed on the light source cover at 45°. The light irradiated downward by the LED lamp beads is reflected at 45° on the surface of the half-reflective half-mirror 13, and then horizontally irradiates the coaxial LED light source 15. The light irradiated horizontally from the coaxial LED light source 15 is irradiated onto the surface of the reflector 14. The reflector 14 placed at 45° causes the horizontal light to be reflected at 45°, and the light is irradiated vertically upward toward the mobile phone lens module. At this time, the light irradiates the mobile phone lens module, which can illuminate specific defect features and present a high-contrast image. See attached Figure 5 ,Whether the nozzle body 4 has backlight or not has a huge impact on the ,detection results.

[0057] The nozzle body 4 moves to the detection position, and the LED light source part starts working, while the visual detection module 3 part starts working at the same time. The telecentric lens 16 is placed horizontally on the left side of the coaxial LED light source 15. When the nozzle body 4 moves to the detection position, the reflector 14 placed at 45° reflects the image of the mobile phone lens module along the optical path to the coaxial LED light source 15. The semi-reflective and semi-mirror 13 inside the coaxial LED light source 15 allows 50% of the light to pass through and 50% of the light to be reflected. Therefore, the image of the mobile phone lens module reflected by the reflector 14 continues to irradiate the telecentric lens 16 through the semi-reflective and semi-mirror 13.

[0058] The telecentric lens 16 receives the image from the mobile phone lens module and focuses it and projects it onto the CMOS image acquisition black and white camera 17 .

[0059] The CMOS image acquisition black and white camera 17 transmits the acquired image data to an image processing computer (not shown in the figure) for data processing to calculate whether there are defects in the mobile phone lens module.

[0060] See attached Figure 4 ,The above process can be summarized into the following steps:

[0061] (1) The nozzle unit 1 sucks the mobile phone lens module through the negative pressure of the suction head;

[0062] (2) The nozzle unit 1 moves to the position of the light source device 2, and the collimated LED light source 11 emits light to the nozzle body 4;

[0063] (3) After the light is refracted by the nozzle body 4, it is reflected by the total reflection microprism 9, and then transmitted by the diffuse reflection microlens 10, and then evenly diffused on the mobile phone lens module;

[0064] (4) The annular LED light source 12 emits light toward the mobile phone lens module;

[0065] (5) The coaxial LED light source 15 emits light to the reflector 14, and the light is reflected and irradiated to the mobile phone lens module;

[0066] (6) The light irradiated on the mobile phone lens module returns along the optical path, is received by the telecentric lens 16, and is focused onto the CMOS image acquisition camera 17 to form an image.

[0067] The above are only preferred embodiments of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A mobile phone lens module defect detection device, characterized in that: The invention comprises a nozzle unit, a light source device and a detection module, wherein the light source device emits light to the nozzle unit to irradiate a mobile phone lens module adsorbed on the nozzle unit, and the detection module performs defect detection on the mobile phone lens module adsorbed on the nozzle unit. The nozzle unit comprises a nozzle body and a nozzle under the nozzle body, wherein the nozzle body is a conical structure of a transparent material, and the nozzle is located at the central position of the bottom surface of the conical structure. The side surface of the conical structure is designed with a plurality of total reflection microprisms at a certain angle, and the total reflection microprisms are arranged in an array. The light emitted by the light source device is refracted by the side surface on the same side of the nozzle body, and then reflected by the total reflection microprism on the side surface on the opposite side, and then vertically irradiated to the bottom surface of the conical structure. The bottom surface of the conical structure is designed with a plurality of diffuse reflection microlenses, and the diffuse reflection microlenses are arranged in an array. The light vertically irradiated to the bottom surface of the conical structure is refracted by the diffuse reflection microlenses to form uniformly divergent diffuse light, and irradiated to the mobile phone lens module adsorbed on the nozzle. The light source device comprises a collimated LED light source, which is arranged on a light source bracket, and irradiates collimated light of a certain angle to the nozzle body; there are two collimated LED light sources, which are symmetrically arranged on both sides of the nozzle body; The detection module includes an annular LED light source and a reflector arranged below the nozzle body, a coaxial LED light source is arranged on one side of the reflector, and a telecentric lens and a CMOS image acquisition camera are arranged on the optical path behind the coaxial LED light source; when the nozzle body is moved to the middle of the two collimated LED light sources, the two collimated LED light sources work, and at the same time when the collimated light is irradiated to the nozzle body, the annular LED light source and the coaxial LED light source arranged below the nozzle body also work at the same time; A reflector is arranged on the optical path below the annular LED light source, and the reflector is at an angle of 45° to the optical path; The CMOS image acquisition camera transmits the collected image data to the image processing computer for data processing to calculate whether there are defects in the mobile phone lens module.

2. The mobile phone lens module defect detection device according to claim 1, characterized in that: The nozzle unit also includes a through hole arranged in the middle position of the nozzle body, the lower end of the through hole is connected to the nozzle, and the upper end is connected to the suction device through an air pipe. The nozzle generates negative pressure to adsorb the mobile phone lens module.

3. The mobile phone lens module defect detection device according to claim 2, characterized in that: The nozzle unit is mounted on a rotating mechanism, and the rotating mechanism is mounted on a moving mechanism.

4. A method for detecting defects in a mobile phone lens module, using the mobile phone lens module defect detection device according to any one of claims 1 to 3, characterized in that: The steps include: (1) The nozzle unit sucks the mobile phone lens module through the negative pressure of the suction head; (2) The nozzle unit moves to the light source device position, and the collimated LED light source emits light to the nozzle body; (3) After the light is refracted by the nozzle body, it is reflected by the total reflection microprism, and then refracted by the diffuse reflection microlens, and then the diffuse light is emitted to evenly illuminate the mobile phone lens module; (4) The ring-shaped LED light source emits light to the mobile phone lens module; (5) The coaxial LED light source emits light to a reflector placed at a 45° angle to the optical path. After reflection, the light is directed vertically upward to the mobile phone lens module. (6) The light irradiated on the mobile phone lens module returns along the optical path, is received by the telecentric lens, and is focused onto the CMOS camera sensor to form an image.

5. The method for detecting defects in a mobile phone lens module according to claim 4, characterized in that: Step (2), step (4), and step (5) are performed simultaneously.

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