Optical image capturing system
By setting a movable guide shaft and magnet assembly on the lens barrel, the problem of axis misalignment of the lens module during AF focusing is solved, improving focusing accuracy and system stability, and avoiding damage to the guide shaft.
Patent Information
- Application Number
- CN202512059331.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-02-13
AI Technical Summary
In existing optical imaging systems, the lens module is prone to axis misalignment during AF focusing, resulting in reduced focusing accuracy, and the guide shaft fixed on the bracket base is easily damaged.
A guide shaft is set on the lens barrel along the optical axis. The guide shaft is movably connected to the base. The lens barrel and the guide shaft move synchronously. The guide shaft is embedded in the mounting protrusion and the connecting groove. It works with the magnet assembly and the elastic connector to achieve stable movement and avoid interference and structural damage.
It improves focusing performance and structural reliability, ensures focusing accuracy, protects the guide shaft when subjected to impact, and enhances the stability and durability of the optical imaging system.
Smart Images
Figure CN121522843A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optical imaging technology, and more specifically to an optical imaging system. Background Technology
[0002] Existing optical imaging systems include a support base and a lens module. To prevent the lens module from shifting relative to the optical axis during autofocus (AF) and to ensure the lens moves linearly along the optical axis, a guide assembly is provided between the support base and the lens module. This guide assembly includes a guide shaft fixedly mounted on the support base and a guide groove on the lens barrel of the lens module. When the lens module moves along the optical axis, the guide assembly guides and limits its movement, preventing axial shift of the lens barrel. However, in this structure, the guide shaft is fixed to the support base, which restricts the movement of the lens barrel during focusing, easily causing interference and jamming, thus reducing the focusing accuracy of the optical imaging system. Furthermore, the guide shaft may even be damaged under significant impact.
[0003] Therefore, it is necessary to provide an optical imaging system that improves focusing performance and reliability. Summary of the Invention
[0004] The purpose of this invention is to provide an optical imaging system that can improve focusing performance and structural reliability.
[0005] The technical solution of the present invention is as follows: The present invention provides an optical imaging system, which includes a base and a housing connected to the base, and a lens barrel housed in an accommodating space formed by the base and the housing, the lens barrel being suspended in the accommodating space; a guide shaft is provided on the outer periphery of the lens barrel along the optical axis, the guide shaft being movably connected to the base, the guide shaft and the lens barrel moving synchronously to realize AF focusing action.
[0006] Optionally, the lens barrel includes a lens barrel body and a mounting protrusion on the outer periphery of the lens barrel, and the guide shaft is embedded in the mounting protrusion; the base has a connecting groove for the mounting protrusion to be inserted, and part of the outer wall of the guide shaft protrudes from the wall surface of the mounting protrusion and contacts the groove wall of the connecting groove.
[0007] Optionally, the mounting protrusion includes a first protrusion, and the connecting groove includes a first connecting groove that mates with the first protrusion; the first protrusion includes a first sidewall and a second sidewall extending outward from the lens barrel body, the first sidewall and the second sidewall being arranged in a direction parallel to the radial direction of the lens barrel, and the guide shaft being embedded in the first sidewall and / or the second sidewall; the first connecting groove includes a first groove wall and a second groove wall arranged parallel to the first sidewall and the second sidewall, and the portion of the guide shaft protruding from the first sidewall and / or the second sidewall contacts the plane of the first groove wall and / or the plane of the second groove wall.
[0008] Optionally, the mounting protrusion further includes a second protrusion disposed opposite to the first protrusion, and the connecting groove further includes a second connecting groove that cooperates with the second protrusion; the second protrusion includes a third sidewall and a fourth sidewall, the third sidewall and the fourth sidewall being disposed in a direction parallel to the radial direction of the lens barrel, and the guide shaft being embedded in the third sidewall and / or the fourth sidewall; the second connecting groove includes a third groove wall and a fourth groove wall disposed parallel to the third sidewall and the fourth sidewall, the third groove wall or the fourth groove wall being provided with a V-shaped snap-fit portion, and the portion of the guide shaft protruding from the first sidewall and / or the second sidewall being snapped into the snap-fit portion.
[0009] Optionally, gaps are provided between the first connecting groove and the first protrusion, and between the second connecting groove and the second protrusion.
[0010] Optionally, the guide shaft is integrally formed into the lens barrel, or the guide shaft and the lens barrel are separately formed and then bonded together.
[0011] Optionally, a driving mechanism is also included, which is used to drive the lens barrel to move along the optical axis direction; the driving mechanism includes a magnet assembly disposed on the outer periphery of the lens barrel, an elastic connector connecting the lens barrel and the base, a flexible circuit board disposed on the base, and a Hall element disposed on the corresponding area of the lens barrel and the flexible circuit board; the magnet assembly is disposed between the mounting protrusions, and the mounting protrusions and the magnet assembly are evenly distributed on the outer periphery of the lens barrel.
[0012] Optionally, the magnet assembly includes a first magnet and a second magnet spaced apart, and a coil assembly disposed between the first magnet and the second magnet. The first magnet is disposed on the base, the second magnet is disposed on the lens barrel, and the coil assembly is fixedly connected to the lens barrel.
[0013] Optionally, the coil assembly includes a bracket and a coil wound on the bracket, with ear plates on both sides of the bracket connected to the lens barrel.
[0014] Optionally, it also includes a magnetic chuck assembly for pressing the guide shaft between the lens barrel and the base.
[0015] The beneficial effects of this invention are as follows: The optical imaging system of the present invention includes a guide shaft extending along the optical axis on the lens barrel. During AF focusing, the guide shaft and the lens barrel move synchronously. The guide shaft is movably connected to the base, guiding the movement of the lens barrel while avoiding interference with the movement of the lens barrel, thus improving focusing performance and ensuring focusing accuracy. The guide shaft is fixed to the lens barrel, preventing it from falling off and causing structural damage under large impact forces, thereby improving the structural stability and reliability of the optical imaging system. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the optical imaging system of the present invention.
[0017] Figure 2 This is an exploded view of the optical imaging system of the present invention.
[0018] Figure 3 This is a schematic diagram of the second angle of the optical imaging system of the present invention.
[0019] Figure 4 for Figure 3 View of a cross-section along AA.
[0020] Figure 5 This is a schematic diagram of the assembly of the lens barrel and guide shaft of the present invention.
[0021] Figure 6 This is a schematic diagram of the base of the present invention.
[0022] Figure 7 This is a schematic diagram of the assembly inside the housing of the optical imaging system of the present invention.
[0023] Among them, 1-base, 11-connecting groove, 111-first connecting groove, 1111-first groove wall, 1112-second groove wall, 112-second connecting groove, 1121-third groove wall, 1122-fourth groove wall, 1123-snap fastening part, 2-outer shell, 3-lens, 31-lens body, 32-mounting protrusion, 321-first protrusion, 3211-first side wall, 3212-second side wall, 322-second protrusion, 3221-third side wall, 3222-fourth side wall, 4-guide shaft, 5-drive mechanism, 51-magnet assembly, 511-first magnet, 512-second magnet, 513-coil assembly, 5131-bracket, 5132-coil, 5133-ear plate, 52-elastic connector, 53-flexible circuit board, 54-Hall element. Detailed Implementation
[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0025] This invention provides an optical imaging system, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, it includes a base 1 and a housing 2 connected to the base 1, and a lens barrel 3 housed in the accommodating space formed by the base 1 and the housing 2. The lens barrel 3 is suspended in the accommodating space. The outer periphery of the lens barrel 3 is provided with a guide shaft 4 arranged along the optical axis. The guide shaft 4 is movably connected to the base 1. The guide shaft 4 and the lens barrel 3 move synchronously to realize the AF focusing action.
[0026] The optical imaging system of this invention includes a guide shaft 4 extending along the optical axis on the lens barrel 3. During AF focusing, the guide shaft 4 and the lens barrel 3 move synchronously. The guide shaft 4 is movably connected to the base 1, guiding the movement of the lens barrel 3 while preventing interference from the guide shaft 4 during movement, thus improving focusing performance and ensuring focusing accuracy. The guide shaft 4 is fixed to the lens barrel 3, preventing it from falling off and causing structural damage under significant impact, thereby improving the structural stability and reliability of the optical imaging system. Furthermore, the system includes a housing 2, which is connected to the base 1 and forms an accommodating space. The lens barrel 3, guide shaft 4, and drive mechanism 5 are housed within this accommodating space. Through holes are provided in the central areas of the housing 2, lens barrel 3, and base 1.
[0027] Optional, see Figures 3 to 7As shown, the lens barrel 3 includes a lens barrel body 31 and a mounting protrusion 32 on the outer periphery of the lens barrel 3. The guide shaft 4 is embedded in the mounting protrusion 32. The base 1 has a connecting groove 11 for the mounting protrusion 32 to be inserted. Part of the outer wall of the guide shaft 4 protrudes from the wall of the mounting protrusion 32 and contacts the groove wall of the connecting groove 11.
[0028] During installation, the guide shaft 4 and the mounting protrusion 32 are simply placed into the connecting groove 11. Compared to the precise alignment of the guide shaft 4, this reduces the assembly precision required for alignment and improves installation efficiency. The mounting protrusion 32, located within the connecting groove 11, guides and limits the movement of the mounting protrusion 32 during the movement of the lens barrel 3. The guide shaft 4, embedded within the mounting protrusion 32, enhances the connection stability between the guide shaft 4 and the lens barrel 3, further improving the structural stability of the optical imaging system.
[0029] Optionally, the mounting protrusion 32 includes a first protrusion 321, and the connecting groove 11 includes a first connecting groove 111 that mates with the first protrusion 321; in some embodiments, the first protrusion 321 includes a first sidewall 3211 and a second sidewall 3212 extending outward from the lens barrel body 31, the first sidewall 3211 and the second sidewall 3212 being arranged in a direction parallel to the radial direction of the lens barrel 3, and the guide shaft 4 being embedded in the first sidewall 3211 and / or the second sidewall 3212; the first connecting groove 111 includes a first connecting groove 111 that mates with the first protrusion 321. The first sidewall 3211 and the second sidewall 3212 are arranged in parallel. The guide shaft 4 protrudes from the first sidewall 3211 and / or the second sidewall 3212 and contacts the plane of the first sidewall 1111 and / or the plane of the second sidewall 1112. The plane of the first sidewall 1111 and / or the plane of the second sidewall 1112 is radially tangent to the guide shaft 4, so that the guide shaft 4 forms a linear contact with the first sidewall 1111 and / or the second sidewall 1112. It can be understood that when the groove wall of the first connecting groove 111 corresponds to the corner area of the base 1, in order to avoid the arrangement of the first connecting groove 111 structure from damaging the overall structure of the base 1, the first connecting groove 111 may also include a groove segment arranged parallel to the side of the base 1. During installation, the first protrusion 321 and the guide shaft 4 are placed together into the first connecting groove 111.
[0030] Optionally, the mounting protrusion 32 further includes a second protrusion 322 disposed opposite to the first protrusion 321, and the connecting groove 11 further includes a second connecting groove 112 that cooperates with the second protrusion 322; the second protrusion 322 includes a third sidewall 3221 and a fourth sidewall 3222, the third sidewall 3221 and the fourth sidewall 3222 are disposed along a direction parallel to the radial direction of the lens barrel 3, and the guide shaft 4 is embedded in the third sidewall 3221 and / or the fourth sidewall 3222; the second connecting groove 112 includes a second connecting groove 112 that cooperates with the third sidewall 3221 and / or the fourth sidewall 3222. The third groove wall 1121 and the fourth groove wall 1122 are arranged parallel to the fourth side wall 3222. The third groove wall 1121 or the fourth groove wall 1122 is provided with a V-shaped snap-fit portion 1123. The part of the guide shaft 4 protruding from the first side wall 3211 and / or the second side wall 3212 is snapped into the snap-fit portion 1123. The wall surface of the guide shaft 4 contacts the wall surface of the snap-fit portion 1123, so that the wall surface of the snap-fit portion 1123 is radially tangent to the guide shaft 4. Two linear contacts are formed between the guide shaft 4 and the snap-fit portion 1123.
[0031] The first protrusion 321 and the second protrusion 322 are arranged radially opposite to each other along the lens barrel body 31 to ensure the stability of the lens barrel 3 under force and the stability of the lens barrel 3 when moving along the optical axis. During installation, the first protrusion 321 and the guide shaft 4 provided thereon are together disposed in the first connecting groove 111, and the second protrusion 322 and the guide shaft 4 provided thereon are together disposed in the second connecting groove 112; the snap-fit part 1123 on the second connecting groove 112 limits the guide shaft 4 provided on the second protrusion 322; the cooperation between the mounting protrusion 32 and the connecting groove 11 limits and guides the movement of the lens barrel 3 along the optical axis, avoids the lens barrel 3 from deflecting significantly relative to the optical axis during focusing, avoids the lens barrel 3 from axial displacement, and thus improves focusing performance.
[0032] Optionally, gaps are provided between the first connecting groove 111 and the first protrusion 321, and between the second connecting groove 112 and the second protrusion 322. These gaps provide a certain amount of space for the movement of the lens barrel 3, allowing for minor misalignment within an acceptable error range. They also act as a buffer when subjected to significant impact (such as a dropped mobile phone), improving the impact resistance and durability of the optical imaging system. Furthermore, the gaps reduce the assembly precision requirements during lens barrel 3 installation.
[0033] Optionally, the guide shaft 4 can be integrally formed into the lens barrel 3, or the guide shaft 4 and the lens barrel 3 can be separately formed and then bonded together. When the guide shaft 4 and the lens barrel 3 are integrally formed, they can be obtained by injection molding. The integral forming method ensures the connection stability between the guide shaft 4 and the lens barrel 3, thereby ensuring the structural stability of the optical imaging system. When the guide shaft 4 and the lens barrel 3 are formed separately, the complex structure of the workpiece is formed separately and then assembled, reducing the processing difficulty.
[0034] The optical imaging system further includes a driving mechanism 5, which drives the lens barrel 3 to move along the optical axis. The driving mechanism 5 includes a magnet assembly 51 disposed on the outer periphery of the lens barrel 3, an elastic connector 52 connecting the lens barrel 3 and the base 1, a flexible circuit board 53 disposed on the base 1, and Hall elements 54 disposed in corresponding areas of the lens barrel 3 and the flexible circuit board 53. The magnet assembly 51 is disposed between the mounting protrusions 32, and the mounting protrusions 32 and the magnet assembly 51 are evenly distributed on the outer periphery of the lens barrel 3. The flexible circuit board is electrically connected to the Hall element 54. The even distribution of the magnet assembly 51 and the mounting protrusions 32 on the outer periphery of the lens barrel 3 ensures uniform driving force and stability of the movement along the optical axis.
[0035] Optionally, the magnet assembly 51 includes a first magnet 511 and a second magnet 512 spaced apart, and a coil assembly 513 disposed between the first magnet 511 and the second magnet 512. The first magnet 511 is disposed on the base 1, the second magnet 512 is disposed on the lens barrel 3, and the coil assembly 513 is fixedly connected to the lens barrel 3. In use, current is passed through the coil assembly 513, and the lens barrel 3 moves along the optical axis under the drive of the electromagnetic interaction between the first magnet 511 and the coil assembly 513. The Hall element 54 provides feedback on the magnetic field change caused by the position change of the second magnet. The base 1 is provided with a support for mounting the first magnet 511.
[0036] Optionally, in some embodiments, the coil assembly 513 includes a bracket 5131 and a coil 5132 wound on the bracket 5131, and the bracket 5131 has ear plates 5133 connected to the lens barrel 3 on both sides.
[0037] In some embodiments, the optical imaging system further includes a magnetic suction assembly for pressing the guide shaft 4 between the lens barrel 3 and the base 1. In use, the lens barrel 3 and the base 1 are brought closer together by the magnetic suction assembly, causing the guide shaft 4 to protrude from the mounting protrusion 32 and contact the first groove wall 1111 and be confined within the snap-fit portion 1123. Optionally, in some embodiments, the magnetic suction assembly includes a magnet and a yoke, with the magnet disposed on one of the lens barrel 3 and the base 1, and the yoke disposed on the other. In other embodiments, the guide shaft 4 is a magnetic guide shaft capable of being attracted, with the magnet disposed on the base 1.
[0038] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.
Claims
1. An optical imaging system, characterized in that, The lens includes a base and a housing connected to the base, and a lens barrel housed within a accommodating space formed by the base and the housing, the lens barrel being suspended within the accommodating space; a guide shaft is provided on the outer periphery of the lens barrel along the optical axis, the guide shaft being movably connected to the base, the guide shaft and the lens barrel moving synchronously to achieve AF focusing action.
2. The optical imaging system according to claim 1, characterized in that, The lens barrel includes a lens barrel body and a mounting protrusion on the outer periphery of the lens barrel. The guide shaft is embedded in the mounting protrusion. The base has a connecting groove for the mounting protrusion to be inserted. A portion of the outer wall of the guide shaft protrudes from the wall of the mounting protrusion and contacts the groove wall of the connecting groove.
3. The optical imaging system according to claim 2, characterized in that, The mounting protrusion includes a first protrusion, and the connecting groove includes a first connecting groove that mates with the first protrusion; the first protrusion includes a first sidewall and a second sidewall extending outward from the lens barrel body, the first sidewall and the second sidewall being arranged in a direction parallel to the radial direction of the lens barrel, and the guide shaft being embedded in the first sidewall and / or the second sidewall; the first connecting groove includes a first groove wall and a second groove wall arranged parallel to the first sidewall and the second sidewall, and the portion of the guide shaft protruding from the first sidewall and / or the second sidewall contacts the plane of the first groove wall and / or the plane of the second groove wall.
4. The optical imaging system according to claim 3, characterized in that, The mounting protrusion further includes a second protrusion disposed opposite to the first protrusion, and the connecting groove further includes a second connecting groove that cooperates with the second protrusion; the second protrusion includes a third sidewall and a fourth sidewall, the third sidewall and the fourth sidewall being disposed in a direction parallel to the radial direction of the lens barrel, and the guide shaft being embedded in the third sidewall and / or the fourth sidewall; the second connecting groove includes a third groove wall and a fourth groove wall disposed parallel to the third sidewall and the fourth sidewall, the third groove wall or the fourth groove wall being provided with a V-shaped snap-fit portion, and the portion of the guide shaft protruding from the first sidewall and / or the second sidewall being snapped into the snap-fit portion.
5. The optical imaging system according to claim 4, characterized in that, A gap is provided between the first connecting groove and the first protrusion, and between the second connecting groove and the second protrusion.
6. The optical imaging system according to claim 1, characterized in that, The guide shaft is integrally formed into the lens barrel, or the guide shaft and the lens barrel are separately formed and then bonded together.
7. The optical imaging system according to claim 2, characterized in that, It also includes a drive mechanism for driving the lens barrel to move along the optical axis; the drive mechanism includes a magnet assembly disposed on the outer periphery of the lens barrel, an elastic connector connecting the lens barrel and the base, a flexible circuit board disposed on the base, and Hall elements disposed on the corresponding areas of the lens barrel and the flexible circuit board; the magnet assembly is disposed between the mounting protrusions, and the mounting protrusions and the magnet assembly are evenly distributed on the outer periphery of the lens barrel.
8. The optical imaging system according to claim 7, characterized in that, The magnet assembly includes a first magnet and a second magnet spaced apart, and a coil assembly disposed between the first magnet and the second magnet. The first magnet is disposed on the base, the second magnet is disposed on the lens barrel, and the coil assembly is fixedly connected to the lens barrel.
9. The optical imaging system according to claim 8, characterized in that, The coil assembly includes a bracket and a coil wound on the bracket, with ear plates on both sides of the bracket connected to the lens barrel.
10. The optical imaging system according to claim 1, characterized in that, It also includes a magnetic chuck assembly for pressing the guide shaft between the lens barrel and the base.