TWM260750U - Auto focus lens module - Google Patents

Description

M260750 IV. Creation Instructions (1) -------- [Technical Field of New Type] This creation is about the improvement of a lens module, which has an autofocus lens and is used in mobile phone cameras Or digital video capture devices such as digital cameras. The design of the motor output gear in the center of the fixed coil effectively simplifies the focusing mechanism components and improves the focusing accuracy, thereby achieving miniaturization. [Previous technology] The acquisition environment and image content of general digital cameras and digital cameras have a considerable range of changes, and the complete steps of capturing images can include (1) capturing images to be captured using imaging lenses (2) borrowing automatic The focus electronic control module determines whether the image is in focus (3) Real-time color image processing makes the image clearer ('4) Through the visual color gamut mapping and image-associated color adaptive processing, the optimal color adaptive processing is automatically performed (5) Digital image vibration compensator is used to compensate the unstable motion image, which makes the picture more stable. In addition, the object image extraction technology can be used to segment the required images for further processing. The conventional autofocus lens module is shown in the first figure. The main components include a lens group, a driving motor, 12 and a lens holder, 1 3. The traditional drive motor 12 is an output shaft 15 protruding from the side wall, and uses the transmission structure provided by the output shaft 1 $ 丨 6 (such as a threaded section) to drive an output gear 丨 7 and a lens group 11 This changes the focus position. The above-mentioned components used to change the focus position have the following features and disadvantages: (1) In order to drive the mirror by the output gear 17 on the side of the drive motor 12

Page 6 M260750, creation instructions (2) The head group 11 changes the focus position, so it takes two to three gears to move the mechanism to the proper position to drive the lens group u to change the focus position. This will cause energy during the transfer process. Loss and backlash, and back ^ is the main problem causing inaccurate focus. Μ (2) Due to the number of transmission elements i't used in the structure disclosed above, the combined area of the gear 17 and the supply gear 1s increases the area of the front projection surface, and relatively large space is required for the assembly of each component. This configuration Washing, Dong 1's words are contrary. I ...., short and small product trends [New content] The structural configuration disclosed before the creation has the above two shortcomings. + The play is only for an innovative automatic issue. More specifically <, this creation; '=, two improvement of the above two central wheel stepping motors and the base and includes an imaging lens group,-* the imaging lens group contains an imaging lens; 5 a material隹 s, .. The front edge of the lens is provided with a tooth type surname and a focus%. The imaging structure. The focusing ring is both inside and outside; 1: the wall is provided with a threaded structure. ^ ,,, σ structure and the bottom is provided with a positioning knot. The stepping motor group contains two fixed wire circles * ^ wheels, where the rotor is provided with a surname, a rotor, and an output connection, and the rotor contains a permanent The magnetic j ,, and a structures overlap the center of the two coils of the output gear and are perpendicular to the optical axis of the imaging lens. ^ The shaft center of the rotor is provided with a threaded knot through the inner edge of the lead end of the page seat. M260750 IV. Creative Instructions (3) --- The head groups are overlapped. In addition, the lens holder includes a sensing element. Further, the sensing element can also be a positioning structure. After the rotation angle of the lens is limited, the stepping motor cannot rotate, which causes the motor current to increase sharply, and the stop position of the lens group is sensed by sensing the motor current. Assemble the day guard, use a threaded structure to rotate the lens group to align the distal focal position, and after aligning the focus ring positioning structure with the position of the sensing element, use the tooth structure inside the focus ring to set up and hold the lens group. The stepping motor unit & gear tooth structure is combined with the outer tooth structure of the focus ring, and the driving motor unit is locked and fixed on the lens holder. μ '. This lens module must have the following characteristics: The gear teeth on the outside of the focus ring are small. The more the focus changes caused by the assembly with the motor output gear, the larger the front projection area of the module will be. The more the lens thread pitch (ρ), the more accurate the 2-point sensing adjustment will be, but the more time it takes to focus the loss, the two conditions (N, P) will be adjusted to achieve a mutual balance, which can achieve the appropriate = ~ area, assembly focus Good accuracy and short focusing time. The relationship between the number of fans and the pitch satisfies the condition of N-50P. Apricot recognition: the time is used to connect the electrical control element with the motor and the sensing element, ^ ^ — the forward or backward signal of the stepper motor group, then the motor rotor is driven to rotate the screw structure on the wrong i11 child to drive the output gear and control the output gear It is stupid that the toothed structure on the output gear drives the imaging lens group to control the rotation of the lens group. Finally, the power of the rotation of the lens group is controlled by the screwing of the lens group and the lens base. The lens holder moves relatively close to iIi, so that the imaging lens can focus at a long distance or. Then the control program M260750 is output by the electrical signal output by the position sensing element.

The lens position is detected and the feedback control motor stops at the correct focus position. Therefore, the above method can effectively reduce the front projection area of the lens module to achieve the miniaturization goal. In addition, the stepping motor directly drives the lens group rotation by the central output, which can reduce the number of actuating components, thereby reducing the settling consumption caused by the transmission and the backlash caused by the transmission, thereby improving the focusing accuracy or reducing the control of the lens group. The difficulty of program processing. [Embodiment] <First Embodiment of the Patent>

Please refer to the second figure, which reveals that the creation includes an imaging lens group 20, a stepping motor group 30 and a lens mount group 40. Among them, the imaging lens group 20 further includes an imaging lens 22 and a focus ring 24. The imaging lens 22 is provided with a toothed structure 222 on the outer side of the front end thereof. The toothed structure 222 has an outer diameter of 7.6 mm and a number of teeth of 36 teeth.

The focusing ring 24 is a ring structure. The focus ring 24 has a thickness of 1.8 mm. The inside a has a toothed structure 242 and the outside is provided with a toothed structure 244. Among them, the tooth profile of the inner tooth profile structure 242 is a missing tooth shape. According to this creative design system, the female three teeth have two teeth as missing teeth, and the tooth structure 2 4 2 has an inner diameter of 6.8 mm and a number of teeth of 12 teeth. . The tooth shape of the tooth structure 244 located outside the focus ring 24 has an outer diameter of ii min, a number of teeth (n) of 42 teeth, and an inclination angle of 5.71 degrees. 7mm。 Please also refer to the fourth figure, the focusing ring 24 is provided with a projection 246 ′ at the bottom of the projection 246 convex height of 0.7mm. As shown in the third figure, the stepping motor group 30 includes two fixed coil groups 32, 34, a rotor 36, and an output gear 38. 8mm。 The shape of the stepping motor group 30 is a cylindrical structure, the outer diameter of which is 6.0 mm, the length of 12. 8mm.

M260750 4. Creation instructions (5) The fixed coil groups 32 and 34 are both hollow cylindrical structures and are respectively set at two ends of the stepping motor group 30. The fixed coil groups 32 and 34 have an inner diameter of 2.9 mm, an outer diameter of 6.0 mm, and a length of 4.0 mm. The inner diameter is composed of upper iron plate pole claws 322, 342 and lower iron plate pole claws 324, 344. It contains an enameled coil with a coil impedance of 40 ohms. The rotor 36 is a solid two-stage cylindrical structure. The outer diameters of the metal shafts at the front and rear ends of the rotor 36 are 1.0 mm, and the outer diameter of the middle position is 2 ·. The rotor 36 is made into a permanent magnet 362, and is provided in a permanent magnet 362. The rotor 36 is provided with a threaded structure at a length of 3.0 mm in the central axial direction. The threaded structure 364 meshes with the output gear 38, and the outer diameter of the toothed structure 364 is 3.1 mm, the tooth shape Pitch 65, pitch angle A = 5.71 degrees. The above-mentioned rotor 3 6 is fixed to the output gear 38 as teeth, and the inclination angle A of the teeth is fixed to the metal case 39. The two-piece element is formed by its outer edge, while the other one-piece element uses the welding method 36 and the output gear 38. The number of steps is 4 steps. The two ends are connected to the bearings 392 and 394 of the two ends of the fixed metal shell 39 through the two fixed coil groups 3 2, 3 4. Cylindrical structure 'its outer diameter is 3.0 mm and the number of teeth is 10.7 degrees' The shaft center of the output gear 38 is fixed to the fixed metal shell 39 and the outer diameter is 6.0 mm. Wrapped in the center of the two fixed coil groups 32 and 34, the three pieces are combined to fix the coil group 32 and 34 and the rotor and the stepper motor group 30 are actuated. For each revolution, refer to the sensing element 44 shown in the second figure. Among them: Please refer to the fifth figure. The lens holder group 40 includes a lens holder 42 and a lens holder 42 made of plastic without slope glass fiber.

Page 10 M260750

Made of materials. The front end of the lens holder 42 is a cylindrical structure with an outer diameter of 8.0 mm, an inner hole of M7 and a threaded structure 422 provided. The threaded pitch of the threaded structure 422 is P = 0.35 mm, and one Spring 424. The rear end of the lens holder 42 is a square structure, and the inner hole is a square hole 426 for accommodating the photosensitive module ′. The rear end of the lens holder 4 2 has an infrared filter lens 4 2 8. Please also refer to the fourth figure, the sensing element 44 is composed of a metal spring sheet 442 and a PCB board 44. The metal spring piece 442 is a metal sheet with a thickness of 0.1 mm and a length of 8.0 mm, and is a component formed by bending at three places. The length of the flat portion is 2.5 mm, the bending angle is 30 degrees, and the bending height is ▼ 2.08mm 'Fold down to an included angle of 90 degrees, bending height 丨 · 〇3mm, and then fold up to help 90 degrees, height 0.3mm. The PCb board 444 has a thickness of 丨 · 〇_ and contains two 1.7X0.9 copper foil contact areas. This area communicates with external electronic components. The assembly relationship of the above components is as follows: ^ Please refer to the second figure, the imaging lens 22 and the focus ring 24 are assembled on the same axis, and the tooth structures 222 and 242 are overlapped with each other. The toothed structure 2 4 4 provided on the outside of the focus ring 24 and the output gear 3 8 of the stepping motor group 40 overlap each other. The lens group 30 series is set on the lens base group 40. Please also refer to the fifth figure, it should be noted that the focal distance of the imaging lens 22 is efl = 4.8mm, and the side wall is provided with a threaded structure 224. The threaded structure 224 has an M7 outer diameter and a thread pitch P = 35 mm, and the threaded structure 2 2 4 and the threaded structure 4 2 2 inside the lens holder 4 2 are overlapped with each other. Also the lens thread pitch? = 0 35, and the number of teeth on the outside of the focus ring is N = 42,

Page 11 M260750 IV. Creative Instructions (7) Meet the requirements of N-50P. As shown in the fourth figure, when the focusing ring 24 rotates, the convex block 246 made on the bottom surface of the focusing ring 24 can be used to touch the position sensing element spring piece 442 arranged on the lens base 42 by the convex block 246 to determine Whether the sensing lens returns to focus at the far-end focus position. In other words, after both ends of the elastic piece 4 4 2 are press-fitted with the projections 2 4 6 of the focus ring 2 4, the two ends of the elastic piece 4 4 2 are in contact with the copper foil on the PCB 444 in a conductive state. The lens returns to focus at the far focus position. Normally, when there is no pressure attached, the ends of the shrapnel 4 4 2 are in an open state. Based on this, it is detected whether the lens returns to focus at the far focus position. Please refer to the fourth and fifth figures again. When the lens module is assembled, the infrared light filtering lens 428 is fixed on the lens holder 42. The position sensing element spring piece 442 is connected to the lens holder 42 and the spring 424 is placed. At the lens holder 42, connect the back focus detection instrument to the lens holder 4 2 and then rotate the lens group 20 to align the far-sighted focus. 'Focus ring 2 4 bottom bump 2 4 6 structure to the shrapnel 4 4 2 Bends. Referring again to the second figure, the internal tooth structure 242 of the focusing ring 24 is assembled with the external tooth structure 222 of the lens 22. Next, the stepping motor group 30 is overlapped with the toothed structure 244 on the outside of the focus ring 24 by the central output gear 38, so that the axis of the motor rotor 36 is perpendicular to the optical axis of the forming lens 22, and finally It is connected to the lens holder 42 and fixed. When the master module is used, the electric control element, motor and sensor :: J after the knot will give the stepper motor group 30 a forward or backward signal to drive the horse 2 = 6 revolutions ^ by the tooth shape on the rotor 36 The structure 364 drives the input imI: ^ 'to control the rotation of the output gear 38. Then, the imaging lens group 2 () is driven by the output gear 38, so as to control the imaging lens group to take away M260750

Turn: Then, the threaded structure of the lens group 20 overlapping with the lens holder 42 is used to convert the rotation force of the lens 2 stomach 2 into the control of the imaging lens group 2 0. Lifting or lowering the lens holder 4 2 relatively, The action causes the imaging lens 22 to focus at a distant or near position. Then, an electric signal is output by the position sensing element 442, so that the control program detects the position of the lens 22 and feedbacks the control motor to stop at the correct focus position. <Second Embodiment of the Patent> Please refer to the sixth figure, which reveals that the creation includes an imaging lens group, a stepping motor group 30, and a lens mount group 40. Among them: The imaging lens group 20 series further includes an imaging lens 22 and a pair of ring rings 24. The front and outer sides of the imaging lens 22 are made into a threaded structure, the threaded structure is M9, and the thread pitch P = 0.3. Threaded structure. The focusing ring 24 is a ring structure. The focusing ring 24 has a thickness of πππ, and is provided with a threaded structure on the inner side and a toothed structure 244 on the outer side. Among them, the thread structure is ㈣, the thread pitch is 0.3, the tooth profile of the tooth structure 244 located outside the focusing ring 24 is double-threaded, the diameter is 12.0 mm, the number of teeth (N) is 46 teeth, and the slope is inclined. The angle is 571 degrees. Please refer to FIG. 6 again, the focusing ring ^ is provided with two protrusions 248 in the middle section. The two protrusions 248 are located at the relative positions of the focusing ring 24. The height of the 248 is 0.85 mm and the width is 2.5 mm. “The stepping motor group 30 is the same as the motor disclosed in the first embodiment, and will not be described in detail here. 5 Please refer to Figures 7 and 8 and a pressure plate 46. Among them: the lens base group 40 The lens holder 42 is composed of a plastic material containing glass fiber. The lens holder M260750 4. Creation instructions (9) The front end of the 42 is a cylindrical structure, and the outside

^: 7 ^ Vn, ^ EP = 0.3 J J-Spring 424. The rear end H :: L 'of the lens holder 42 is provided with a square hole 426 on the upper side to receive the photosensitive lens structure. The inner hole is a filter lens 428. … There is an infrared light at the rear end of the lens holder 42. The pressing plate 46 is a thin metal plate with a thickness of 0.3 mm and an external shape.

KnnnXUnnn's square structure has a circular opening with a diameter of 10 in the center. The circular opening is provided with two pressure plate positioning protrusions 462 which are symmetrical in position and have a width of 10 mm and 1 mm. The above is the relationship between the last name of each part of this creation: yak ,,.结构。 Structure. And the assembly of the components of the upper body The lens holder 4 2 and the focusing ring 24 are screwed and overlapped with each other in a threaded structure. The imaging lens 22 is screwed and overlapped with the screw ring and the grain structure and the focusing ring 24. The focusing ring 24 overlaps with an output gear 38 of the stepping motor group 30 with a toothed structure 244 provided on the outer side. The pressure plate 46 and the lens holder 42 are assembled and fixed to each other at a specific angle. The lens group is set on the lens holder group 40. When the projection 248 made on the side wall of the focus ring 24 is rotated, the projection 248 and the pressure plate positioning projection 462 can block each other, restrict the rotation angle of the focus ring 24, and stop the rotation of the focus ring 24, resulting in a step. The current of the group 30 increased, and the stopping point of the lens was detected. Please refer to the eighth figure. When the lens module is assembled, the infrared filter lens 428 is fixed on the lens holder 42, the focusing ring 24 is assembled with the lens holder 4 2 with a thread structure, and the imaging lens 2 2 is Threaded structure with focus ring 2 4 groups

M260750 on the 14th, creation instructions (10) Install 'After turning the focus ring 2 4 to a specific angle, assemble the pressure plate 4 6 and the lens holder 4 2 with each other, and dispense and fix the back focus detection instrument and the mirror The base 42 is connected, and then the imaging lens 2 2 ′ is rotated to bring the back end into focus. Next, the stepping motor group 30 is overlapped with the toothed structure 244 on the outside of the focus ring 24 by using the central output gear 38, so that the axis of the motor rotor 36 is perpendicular to the optical axis of the molding lens 22, and finally is The lens holders 4 are connected and fixed. When the lens module is used, a stepping motor group 30 is given a forward or backward signal to drive the motor rotor 36 to rotate. The toothed structure 364 on the rotor 36 drives the output gear 38 to control the rotation of the output gear. The output gear 38 drives the imaging lens group 20 to control the imaging lens group 20 to rotate. The threaded structure of the lens group 20 overlapping with the lens holder 42 transforms the force of the rotation of the lens 22 into controlling the lens group 20's pairing of the lens holder "phase = lifting or lowering action, so that the imaging lens 22 focuses at a distance. From or near. Then, by rotating the lens group 20 to a specific angle, the projection 248 on the outer ring 2 of the focus ring 24 and the pressure plate positioning projection 462 are connected to each other = side: t method is rotated again, so that the motor group 30 stops rotating, ί = surge. This senses the stop position of the lens group. The formulas and embodiments are the preferred embodiments of this creation and the design drawings. The examples and design drawings are only examples, and are not used in the following "Shen, Xi: 丨 ΐ 4 4 technical skills, Or for those who do not deviate from the scope of the rights covered by the contents of the target, the scope of the work is the scope of the applicant's rights. Page 15 M260750 Schematic Brief Description The first diagram is the conventional structure. The second picture is the first, the third picture is the step by step, the fourth picture is the first, the fifth picture is the first, the sixth picture is the second, the seventh picture is the second, and the eighth picture. This is the second 11 lens group 13 lens holder 1 6 transmission structure 2 0 lens group 222 tooth structure 2 4 2 tooth structure 246, 248 bump 3 2 fixed coil group 3 2 4 lower iron plate pole claw 342 upper iron Plate pole claw 36 rotor 364 thread structure 39 fixed metal shell 394 bearing 42 mirror seat 424 spring intention. Structural schematic diagram of the first embodiment. Structural schematic diagram of the motor unit. Structural schematic diagram of the second embodiment. Structural schematic diagram of the third embodiment. Structural schematic diagram of the first embodiment. Embodiment structure diagram two. Example structure diagram 3. 1 2 driving motor 1 5 output shaft 17 output gear 2 2 imaging lens 24 focus ring 244 tooth structure 3 0 stepping motor group 3 2 2 upper iron plate pole claw 3 4 fixed coil group 344 lower iron Plate pole claw 3 6 2 permanent magnet 38 output gear 3 9 2 bearing 4 0 mirror seat group 422 thread structure 4 2 6 square hole

M260750 Brief description of the diagram 44 sensing element 442 position sensing element (spring) 444 PCB board 46 pressure plate 4 6 2 pressure plate positioning protrusion li ··

Claims (1)

M260750 5. Scope of patent application1. An improved autofocus lens module, including an imaging lens group; a stepping motor group is used to drive the imaging lens group, which consists of two fixed coil groups, a rotor and an output gear A permanent magnet is arranged on the rotor, and two ends of the rotor shaft center pass through the center of the two fixed coils located at both ends; a mirror base group is used for the installation and fixing of the imaging lens group; The center of the rotor is further provided with a thread structure. To overlap the output gear, the axis of the rotor and the optical axis of the imaging lens are perpendicular to each other. 2. The improvement of the autofocus lens module according to item 1 of the scope of the patent application, wherein the side wall of the imaging lens group is provided with a threaded structure for overlapping the lens holder. 3. The improvement of the autofocus lens module according to item 2 of the scope of the patent application, wherein the imaging lens group further includes an imaging lens and a focusing ring, and the front end of the imaging lens has a toothed structure for overlapping the focusing ring, The inner edge of the focus ring has a toothed structure for overlapping the imaging lens, and the outer edge of the focus ring is provided with a toothed structure for overlapping the output gear. 4. As the improvement of the autofocus lens module in the third patent application scope, wherein the lens holder is provided with a sensing element, and the focusing ring is provided with a positioning structure to trigger the sensing element on the lens holder to generate an electrical signal. . 5. The improvement of the autofocus lens module according to item 4 of the scope of the patent application, wherein the sensing element is a metal dome, and the positioning structure on the focus ring is a bump. 6. The improvement of the autofocus lens module as described in item 3 of the scope of patent application, Page 18 M260750 5. Scope of patent application Among them, a spring is arranged below the imaging lens and between the lens holder. 7. The autofocus and lens module as described in item 3 of the scope of the patent application, where the number of teeth on the outer edge of the focus ring is N, and the thread of the imaging lens = P, where N-50P. The distance is 8. The autofocus lens module according to item 2 of the scope of patent application is modified. The lens holder is made of plastic material without glass fiber. 9 · The autofocus lens module according to item 丨 of the scope of the patent application is modified, wherein the rain group fixed coil group and the metal pole claw provided with the stepping motor group. τ You d cable 10. The autofocus lens module as described in item 9 of the scope of patent application, wherein the two sets of fixed coil groups of the stepping motor group are fixed with two scoops on the outside, and two sides of the fixed metal shell are provided. Fixed bearings are used to support the parts. 11. The improvement of the autofocus lens module as described in item i 0 of the scope of patent application: wherein the fixed metal shell of the stepping motor group overlaps with the axis of the output gear ° 1 2 · As the scope of patent application scope i Improvements in the autofocus lens module described in item 丨. The permanent magnet on the rotor of the Hai stepping motor unit is made of plastic. The magical permanent magnet is provided with a toothed structure to overlap the output. 1 3. The autofocus lens according to item 3 of the scope of patent application, wherein the number of steps per revolution of the stepping motor is 8 steps or less. All, and Han Liang 14. The improved autofocus lens module as described in item 13 of the scope of patent application, wherein the number of steps per revolution of the stepping motor is 4 steps or less. ,, M260750 V. Scope of patent application 1 As mentioned in εΛ, please refer to item 13 of the scope of the second auto-focus lens module, and the lens core is improved. The lens holder is provided with an infrared light filtering lens. 16. The improvement of the autofocus lens module according to item 3 of the scope of the patent application, wherein the tooth shape of the inner ring of the focus ring is a toothless shape. 1 7 · The improvement of the autofocus lens module as described in item 16 of the scope of patent application 'wherein the focus ring tooth shape is a three-tooth missing two-tooth missing shape 1 8 · as described in item 1 of the scope of patent application The autofocus lens module is improved. The lens module includes a focusing ring and a lens holder. The lens holder is provided with an external thread structure. The focus ring is provided with an internal thread structure. The two are overlapped with each other. The lens holder is provided with external threads. , Overlapping with the internal thread on the focusing ring; a toothed structure is arranged on the focusing ring, overlapping with the output gear of the motor unit. 19 · According to the improvement of the autofocus lens module described in item 18 of the scope of patent application, the lens group includes a pressure plate, and a bump is set on the outside of the focus ring. When the focus ring rotates, the bump on the focus ring will be at a specific angle Contact with the pressure plate to limit the rotation angle of the focus ring. 20. The improved autofocus lens module described in item 18 of the scope of patent application. The internal thread structure on the focus ring is a double-threaded structure. 21 · The autofocus lens module is improved as described in item 19 of the scope of patent application, the height of the stepping motor is less than 12_ ° Page 20