A mobile phone external polarizing lens module

Abstract

This utility model discloses an external polarizing lens module for mobile phones. The module includes a PCB board with a color card calibration slot, a first protruding post, a second protruding post, and a third protruding post. A linkage calibration mechanism is mounted on the first protruding post and is connected to the color card calibration slot. A polarizer rotating bracket is mounted on the second protruding post and is connected to the linkage calibration mechanism. The polarizer rotating bracket includes a rotating ring with a polarizer mounted above it and a snap-fit ​​connection mechanism welded below it. A ratchet is mounted on the third protruding post with teeth that provide six physical angle positioning for the rotation of the rotating ring. This utility model adjusts the polarizer angle by rotating the polarizer through the rotating ring, eliminating ambient light interference and improving skin color detection accuracy. Furthermore, by filtering out ambient light interference through the polarizer, even higher precision detection can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of optical accessories for mobile terminals, and in particular to an external polarizing lens module for mobile phones. Background Technology

[0002] Currently, skin tone detection functionality on smartphones has wide applications in areas such as virtual try-on, beauty product recommendations, and medical skin analysis. However, existing technologies face two major challenges in practical use:

[0003] 1. Severe ambient light interference

[0004] Ordinary mobile phone cameras are significantly affected by ambient light (such as warm indoor light and strong outdoor light), resulting in a color difference error (ΔE) in skin color detection that generally exceeds 5, far exceeding the accuracy requirements of professional equipment (ΔE<1.5). Specular reflection can obscure the true information of the dermis, causing the detection result to deviate significantly from the user's actual skin color, making it difficult to meet the needs of high-precision scenarios (such as medical aesthetic diagnosis).

[0005] 2. Specialized equipment is difficult to popularize.

[0006] While existing polarization detection equipment can solve the problem of ambient light interference, it suffers from drawbacks such as high cost (approximately $5,000), large size, and complex operation, making it unsuitable for integration into everyday mobile scenarios.

[0007] Users need to rely on professionals to operate it, and the equipment cannot be carried around, which greatly limits the practicality and promotional value of the technology. Utility Model Content

[0008] The purpose of this utility model is to solve the technical problems existing in the prior art and provide a mobile phone external polarization lens module.

[0009] To achieve the above objectives, the technical solution provided by this utility model is: an external polarizing lens module for mobile phones. The module includes a PCB board, with a Hall sensor and a color card calibration slot respectively disposed at the left and right ends of the PCB board. The PCB board has a first protruding post, a second protruding post, and a third protruding post. A linkage calibration mechanism is disposed on the first protruding post and is drively connected to the color card calibration slot. A polarizer rotating bracket is disposed on the second protruding post and is drively connected to the linkage calibration mechanism. The polarizer rotating bracket includes a rotating ring. A polarizer is installed at the top, and a snap-fit ​​connection mechanism is welded below the rotating ring. The snap-fit ​​connection mechanism is installed on the camera. A ratchet disk is installed on the third protruding column. The ratchet disk has teeth that are connected to the rotation of the rotating ring. The upper and lower ends of the rotating ring are respectively equipped with ratchet teeth. The ratchet teeth at the upper end are connected to the linkage calibration mechanism, and the ratchet teeth at the lower end are connected to the ratchet disk. The teeth on the ratchet disk are used to physically position the rotation angle of the rotating ring in 6 angles through the ratchet teeth at the lower end. Magnets are installed on the teeth of the ratchet disk, and the magnets face the Hall sensor.

[0010] Preferably, the color card calibration slot includes a slide rail structure, a guide structure, and a trigger sensor; the trigger sensor includes a photoelectric sensor; the slide rail structure includes a mounting base, on which a slide rail slot for a standard color card is provided; the bottom of the slide rail slot is provided with quartz glass, and a photoelectric sensor and a Bluetooth module are provided on the quartz glass; the guide structure includes miniature balls and a movable rack; the miniature balls are provided on both sides of the slide rail slot; the upper end of the rack is provided with a protrusion, which is located in front of the movement of the miniature balls on the lower side of the slide rail slot; the lower end of the rack is connected to the linkage calibration mechanism for transmission.

[0011] Preferably, the width of the slide rail groove is 85mm±0.2mm, the depth of the slide rail groove is 12mm±0.1mm, and a reset spring device is provided at the ends of both sides of the slide rail groove. The reset spring device has an internal electromagnetic lock.

[0012] Preferably, the linkage calibration mechanism includes a planetary gear set, which includes a central gear. A first protruding post is embedded in the central gear and rotatably connected to the central gear. Three sets of planetary pinions mesh on the central gear, and the three sets of planetary pinions mesh together on the same planetary gear. The planetary gear meshes with the lower end of the rack and is connected to the transmission. The ratchet teeth at the upper end of the rotating ring mesh with the planetary gear and are connected to the transmission.

[0013] Preferably, a central column is provided at the center of the rotating ring, the second protruding column is embedded in the central column and rotatably connected to the central column, and smooth cylindrical surfaces are provided at the left and right ends of the rotating ring. Circular bearings A and B for supporting the two sides of the rotating ring are respectively provided on the smooth cylindrical surfaces at both ends. Both circular bearings A and B are rotatably connected to the PCB board.

[0014] Preferably, the snap-fit ​​connection mechanism includes a main snap-fit ​​assembly, which includes a ring snap. The ring snap has four sets of auxiliary positioning posts that cooperate with the mobile phone camera. Each auxiliary positioning post is equipped with a pressure-triggered switch, which is a miniature membrane switch used to detect the installation status of the ring snap. The ring snap has openings on its upper and lower sides for inserting a PCB board. The PCB board is inserted into the ring snap and positioned at the camera.

[0015] The beneficial effects of this utility model are:

[0016] This invention uses a rotating ring to drive the polarizer to rotate, thereby precisely adjusting the polarizer angle, eliminating ambient light interference, and improving the accuracy of skin color detection.

[0017] This invention requires no additional professional equipment, is lightweight and compact, and can be quickly installed through a snap-fit ​​connection mechanism. The slide rail is compatible with standard Pantone color charts (25×35mm±0.1mm), making replacement convenient and significantly reducing costs. It is highly portable and easy to use.

[0018] In this invention, the polarizer is coated with a MgF2 antireflection film (refractive index 1.38-1.42) to improve light transmittance and reduce signal loss; the photoelectric sensor (940nm modulated infrared) works in conjunction with the Hall sensor to eliminate interference from ambient light and mechanical vibration; and it has excellent anti-interference capabilities. Attached Figure Description

[0019] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the color card calibration slot, linkage calibration mechanism, polarizer rotating bracket, and ratchet disk connection of this utility model;

[0022] Figure 3 This is a schematic diagram of the slide rail structure and guide structure inside the color card calibration slot.

[0023] Figure 4 This is a schematic diagram of a snap-fit ​​connection structure;

[0024] Figure 5 This is a schematic diagram of the front structure of the PCB board.

[0025] Attached image captions:

[0026] 1-Slide rail structure, 2-Guide structure, 3-Photoelectric sensor, 4-Bluetooth module, 5-Planetary gear set, 6-Rotating ring, 7-Smooth cylindrical surface, 8-Ratchet disk, 9-Hall sensor, 10-Reset spring device, 11-Quartz glass, 12-Miniature ball, 13-Ring buckle, 14-Auxiliary positioning post, 15-Pressure trigger switch, 16-Rotating ring center post, 17-Central gear, 18-Second protruding post, 19-First protruding post, 20-Magnet. Detailed Implementation

[0027] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0028] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0030] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0031] Reference Figures 1-5In a preferred embodiment of this utility model, a mobile phone external polarizing lens module is provided. The module includes a PCB board, with a Hall sensor 9 and a color card calibration slot respectively disposed at the left and right ends of the PCB board. A first protruding post 19, a second protruding post 18, and a third protruding post are disposed on the PCB board. A linkage calibration mechanism is disposed on the first protruding post 19, and the linkage calibration mechanism is drivenly connected to the color card calibration slot. A polarizer rotating bracket is disposed on the second protruding post 18, and the polarizer rotating bracket is drivenly connected to the linkage calibration mechanism. The polarizer rotating bracket includes a rotating ring 6, and a polarizer is disposed above the rotating ring 6. The rotating ring 6 has a snap-fit ​​connection mechanism welded (laser welded) below it. A ratchet disk 8 is provided on the third protruding column. The ratchet disk 8 is provided with teeth that are connected to the rotating ring 6 in a transmission. The upper and lower ends of the rotating ring 6 are respectively provided with ratchet teeth. The ratchet teeth at the upper end are connected to the linkage calibration mechanism (the large planetary gear in the planetary gear set 5) in a transmission, and the ratchet teeth at the lower end are connected to the ratchet disk 8 in a transmission. The teeth on the ratchet disk 8 are used to physically position the rotation angle of the rotating ring 6 in 6 angles through the ratchet teeth at the lower end. Magnets 20 are provided on the teeth of the ratchet disk 8, and the magnets 20 face the Hall sensor 9.

[0032] Furthermore, the teeth on the ratchet disc 8 provide six physical angle positioning for the rotation angle of the rotating ring, allowing users to make detailed angle adjustments and ensuring the accuracy of the detection angle.

[0033] Specifically: each rotation of the teeth on the ratchet 8 corresponds to one adjustment of the ratchet 8, which adjusts the angle of the magnet 20 by 5°, with an angle adjustment accuracy of ±0.5°; each adjustment of the ratchet 8 triggers the Hall sensor 9 (sensitivity ±1°). Each rotation of the ratchet 8 changes the position of the magnet 20, altering the magnetic field strength around the Hall sensor 9; after detecting the change in the magnetic field, the Hall sensor 9 outputs a corresponding digital signal (such as high / low level); the signal from the Hall sensor 9 is transmitted to the mobile APP via the Bluetooth module 4, displaying the current polarizer angle (such as 45°) in real time. During the process, the sensitivity of the Hall sensor 9 is precisely controlled (±1°) to ensure that the angle error is ≤0.5°.

[0034] In this embodiment, the color card calibration slot includes a slide rail structure 1, a guide structure 2, and a trigger sensor; the trigger sensor includes a photoelectric sensor 3, the slide rail structure 1 includes a mounting base, the mounting base is provided with a slide rail groove for a standard color card (Pantone color card: 25×35mm±0.1mm), the width of the slide rail groove is 85mm±0.2mm, the depth of the slide rail groove is 12mm±0.1mm, and a reset spring device 10 is provided at the ends of both sides of the slide rail groove, the reset spring device 10 has a built-in electromagnetic lock.

[0035] Specifically, the reset spring device 10 and the built-in electromagnetic lock of this utility model are general standard parts and are known to those skilled in the art. Their structure and principle are existing technologies, and those skilled in the art can flexibly select them as needed. They will not be described in detail here.

[0036] It should be further noted that the slide rail travel is 35mm ± 0.1mm. A positioning protrusion with a height of 0.3mm is also included to ensure accurate positioning when a standard Pantone color chart (25×35mm) is inserted.

[0037] Furthermore, a quartz glass 11 is provided at the bottom of the slide rail groove. The quartz glass 11 has the following specifications: φ2mm and light transmittance >92%. A photoelectric sensor 3 (response time 10ms) and a Bluetooth module 4 are provided on the quartz glass 11. The guide structure 2 includes a micro ball 12 and a movable rack. The micro ball 12 is provided on both sides of the slide rail groove. The upper end of the rack is provided with a protrusion. The protrusion is located in front of the micro ball 12 on the lower side of the slide rail groove. When the micro ball 12 moves forward, it drives the rack to move forward. The lower end of the rack is connected to the linkage calibration mechanism.

[0038] Preferably, a 1mm thick transparent silicone anti-slip pad is added to the photoelectric sensor 3 and the Bluetooth module 4, which is the surface that directly contacts the color card; this increases the coefficient of friction and prevents displacement after installation.

[0039] Specifically, the transmission of the miniature ball bearing 12 and rack and pinion, as well as the integrated design of the quartz glass 11 and photoelectric sensor 3; the miniature ball bearing 12 reduces the insertion resistance, and combined with the reset spring device 10 and electromagnetic lock, it realizes the automatic return of the color card, which can improve the calibration efficiency.

[0040] The photoelectric sensor 3 is equipped with a transmitter and a receiver, which are at a 45° angle to each other (to reduce direct reflection interference). This invention begins to work after the detection color card is in place (i.e., the light is largely blocked).

[0041] Specifically, the color card is inserted, pushing the rack (stroke 35mm ± 0.1mm) → planetary gear set 5 rotates → rotating ring 6 rotates. When the color card is fully inserted into the slide rail slot, the surface of the photoelectric sensor 3 (such as the white calibration area of ​​the Pantone color card) reflects infrared light to the receiving tube; the current of the receiving tube increases with the intensity of the reflected light, and after judgment by the comparator built into the photoelectric sensor 3, a low-level signal is output; the signal is transmitted to the mobile phone motherboard through the wire, triggering the operation of this utility model and starting the calibration process. After the color card is removed, the reflected signal disappears, and the sensor returns to a high-level output.

[0042] In this embodiment, the linkage calibration mechanism includes a planetary gear set 5, which includes a central gear 17. A first protruding post 19 is embedded in the central gear 17 and rotatably connected to the central gear 17. Three sets of planetary pinions are meshed on the central gear 17, and the three sets of planetary pinions mesh together on the same planetary gear. The planetary gear meshes with the lower end of the rack for transmission.

[0043] Furthermore, a transparent protective cover (PC material) is added to the outside of planetary gear set 5 to prevent dust and facilitate observation.

[0044] In this embodiment, a central pillar 16 is provided at the center of the rotating ring 6, and a second protruding pillar 18 is embedded in the central pillar 16 and rotatably connected to it. Smooth cylindrical surfaces 7 are provided at both ends of the rotating ring 6, and circular bearings A and B are respectively provided on the smooth cylindrical surfaces 7 at both ends to support the two sides of the rotating ring 6. Both circular bearings A and B are rotatably connected to the PCB board. The rotating ring 6 is used to carry and drive the polarizer to rotate, thereby accurately adjusting the polarizer angle, eliminating ambient light interference, and improving the accuracy of skin color detection.

[0045] In this embodiment, the snap-fit ​​connection mechanism includes a main snap-fit ​​assembly, which includes an annular snap-fit ​​13. The annular snap-fit ​​13 is provided with four sets of auxiliary positioning posts 14 that cooperate with the mobile phone camera. The auxiliary positioning posts 14 are provided with pressure trigger switches 15, which are miniature membrane switches used to detect the installation status of the annular snap-fit ​​13. The annular snap-fit ​​13 also has openings on its upper and lower sides for inserting a PCB board, which is inserted into the annular snap-fit ​​13.

[0046] The pressure trigger switch 15 of this utility model is a general standard part and a component known to those skilled in the art. Its structure and principle are existing technologies, and those skilled in the art can flexibly select it as needed. It will not be described in detail here.

[0047] Specifically, during use, by pressing the two sets of pressure trigger switches 15, the entire ring buckle 13 is snapped into the edge of the camera. After completion, all four sets of pressure trigger switches 15 are in the "pressed" state, which indicates that the ring buckle 13 is fixed on the camera.

[0048] In use, this utility model is installed as follows: First, the central gear 17 of the planetary gear set 5 is embedded into the first protruding post 19; second, the central post 16 of the rotating ring 6 is embedded into the second protruding post 18, the polarizer is set on the upper part of the rotating ring 6, and the snap-fit ​​connection mechanism is laser-welded to the lower part of the rotating ring 6; finally, by pressing the two sets of pressure trigger switches 15, the entire ring buckle 13 in the snap-fit ​​connection mechanism is snapped into the edge of the camera. After completion, all four sets of pressure trigger switches 15 are in the "pressed" state, that is, the ring buckle 13 is connected to the camera.

[0049] The optical principle of this invention is as follows: First, a linear polarizer is used: Sony SR-550 type (thickness 0.5mm±0.05mm), coated with MgF2 antireflection film (refractive index 1.38-1.42). The optical principle of the polarizer is that polarized light can eliminate environmental interference; that is, ambient light (unpolarized light) becomes linearly polarized light in a specific direction (e.g., 45°) after passing through the polarizer. When polarized light shines on the skin surface: if it is specular reflection, it retains its polarization direction (it is filtered twice by the polarizer, significantly weakened); if it is diffuse reflection, it carries information from the dermis layer of the skin (the polarization direction is random, and some passes through). Then, the mobile phone camera receives the remaining diffuse reflection light. Through the above process, a clean skin tone image with surface reflection removed can be obtained.

[0050] The mechanical transmission principle of this utility model is as follows: When the color card is inserted into the slide rail groove, the color card moves forward within the slide rail groove (which can trigger the photoelectric sensor 3 within the slide rail groove (response time 10ms), and the signal from the photoelectric sensor 3 wakes up the mobile APP via the Bluetooth module 4); the forward movement of the color card pushes the micro-ball bearing 12, which in turn pushes the protrusion on the rack below the slide rail groove, thereby pushing the rack. The rack then pushes the large planetary gear in the planetary gear set 5 to rotate, and the rotation of the large planetary gear drives the ratchet teeth on the upper section of the rotating ring 6 to rotate, thereby driving the entire rotating ring 6 to rotate, which in turn drives the polarizer on the rotating ring 6 to rotate. This achieves the effect of the color card insertion causing the polarizer to rotate. When the color card is fully inserted into the slide rail groove... This allows the polarizer to rotate 45°±2° (optimal detection angle). The ratchet disk 8, connected to the ratchet teeth at the lower end of the rotating ring 6, provides physical positioning functionality with six adjustable angle settings (each setting is 5°). When the user is not satisfied with the shooting effect, they can manually rotate the ratchet disk 8. The Hall sensor 9 collects the rotation data of the ratchet disk 8, and the mobile device combines the user's rotation setting with the polarizer's already rotated angle to determine the final polarizer rotation angle. This allows for detailed angle adjustments by the user, ensuring the accuracy of the detection angle. Finally, to achieve dynamic calibration of the color chart, the user inserts a standard Pantone color chart into the slide rail slot, and then uses a mobile app to capture the color of the color chart under polarized light.

[0051] Without causing conflict, those skilled in the art can freely combine and use the above-mentioned additional technical features.

[0052] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. A mobile phone external polarizing lens module, characterized in that: The module includes a PCB board with a Hall sensor and a color card calibration slot at its left and right ends, respectively. The PCB board has a first protruding post, a second protruding post, and a third protruding post. A linkage calibration mechanism is mounted on the first protruding post and is connected to the color card calibration slot. A polarizer rotating bracket is mounted on the second protruding post and is connected to the linkage calibration mechanism. The polarizer rotating bracket includes a rotating ring with a polarizer above it and a snap-fit ​​connection mechanism welded below it, which is mounted to a camera. A ratchet disk is mounted on the third protruding post, with teeth on the ratchet disk that are connected to the rotating ring. Ratchet teeth are located at the upper and lower ends of the rotating ring; the upper ratchet teeth are connected to the linkage calibration mechanism, and the lower ratchet teeth are connected to the ratchet disk. The teeth on the ratchet disk provide six angle positions for the rotation of the rotating ring via the lower ratchet teeth. Magnets are mounted on the teeth of the ratchet disk, facing the Hall sensor.

2. The mobile phone external polarized lens module according to claim 1, characterized in that: The color card calibration slot includes a slide rail structure, a guide structure, and a trigger sensor. The trigger sensor includes a photoelectric sensor. The slide rail structure includes a mounting base with a slide rail slot for a standard color card. Quartz glass is placed at the bottom of the slide rail slot, and a photoelectric sensor and a Bluetooth module are mounted on the quartz glass. The guide structure includes miniature balls and a movable rack. The miniature balls are located on both sides of the slide rail slot, and the upper end of the rack has a protrusion located in front of the miniature balls traveling on the lower side of the slide rail slot. The lower end of the rack is connected to the linkage calibration mechanism.

3. The mobile phone external polarizing lens module according to claim 2, characterized in that: The width of the slide rail groove is 85mm±0.2mm, the depth of the slide rail groove is 12mm±0.1mm, and a return spring device is provided at the end of both sides of the slide rail groove. The return spring device has an internal electromagnetic lock.

4. The mobile phone external polarizing lens module according to claim 2, characterized in that: The linkage calibration mechanism includes a planetary gear set, which includes a central gear. A first protruding post is embedded in the central gear and rotatably connected to it. Three sets of planetary pinions mesh on the central gear, and the three sets of planetary pinions mesh together on the same planetary gear. The planetary gear meshes with the lower end of the rack and is connected to the transmission. The ratchet teeth at the upper end of the rotating ring mesh with the planetary gear.

5. The mobile phone external polarizing lens module according to claim 1, wherein: A central column is provided at the center of the rotating ring. The second protruding column is embedded in the central column and is rotatably connected to it. Smooth cylindrical surfaces are provided at both ends of the rotating ring. Circular bearings A and B are respectively provided on the smooth cylindrical surfaces at both ends to support the two sides of the rotating ring. Both circular bearings A and B are rotatably connected to the PCB board.

6. The mobile phone external polarizing lens module according to claim 1, wherein: The snap-fit ​​connection mechanism includes a main snap-fit ​​assembly, which includes a ring snap. Inside the ring snap, there are four sets of auxiliary positioning posts that cooperate with the mobile phone camera. On the auxiliary positioning posts, there are four sets of pressure trigger switches that are symmetrically distributed. The pressure trigger switches are miniature membrane switches used to detect the installation status of the ring snap. The ring snap has openings on the upper and lower sides for inserting a PCB board. The PCB board is inserted into the ring snap and positioned at the camera.

Images