CN101509996A - Electromagnetic interference prevention mechanism for micro-lens - Google Patents

Abstract

Micro-lens electromagnetic interference prevents system mechanism includes: a frame, four magnetic components are arranged around the frame; a bearing seat for bearing a micro lens, and a coil component is coated outside the bearing seat; at least one elastic component, which is composed of an outer fixed part and an inner movable part which are mutually connected with four groups of ninety-degree strings, wherein the outer fixed part is connected with the frame, and the inner movable part is connected with the bearing seat to form an elastic movable supporting bearing seat which is suspended in the center of the frame; the upper cover and the lower cover are respectively arranged above and below the frame and fixedly connected with the elastic component on the frame; and the metal outer cover covers the upper cover, the elastic component, the bearing seat, the frame and the lower cover, and at least one conductive connecting piece is arranged at the bottom of the metal outer cover and is electrically connected to the ground end, so that the electromagnetic effect generated to the outside is isolated in a grounding mode, and the external electromagnetic interference and electrostatic protection are also isolated.

Description

Miniature Lens Electromagnetic Interference Prevention Mechanism

technical field

The present invention is a micro-lens electromagnetic interference prevention mechanism, in particular to a micro-focus lens that uses electromagnetic drive to drive the lens to move to achieve the focusing function, and a mechanism for preventing electromagnetic interference (EMI, EMC and ESD).

Background technique

Due to the advancement of technology, the volume of digital cameras has been reduced quite small, and the current mobile phones are also equipped with digital camera functions, which are due to the modularization and miniaturization of camera lenses, and in the miniature lenses There are many types of autofocus drive structures, and the most commonly used one is the voice coil motor (VCM). Due to its small size, low power consumption, precise actuation displacement, and low price, it is suitable for autofocus in micro lenses. short drive.

As shown in Figure 1, it is an existing lens focusing device 200, which mainly includes a lens group 201 and a light sensor assembly 202. The lens group 201 can image the reflected image light of the subject on the light sensor On the component 202; if the distance between the lens group 201 and the light sensing component 202 is fixed (that is, a fixed-focus lens), then it can only clearly present objects at a distance (Hyper focal Distance) of 2-3 meters; if To have the close-up function, an additional lens focusing device must be used to drive the lens group 201 to move, so as to change the distance between the lens group and the light sensing component to achieve the purpose of focusing.

And when the lens group 201 has optical zoom (Zoom) function, also must coordinate the change of the zoom factor between the multiple groups of mirror groups inside the lens group, to produce corresponding displacement, at this moment described mirror group displacement also needs to be The focusing device is designed in the lens module.

However, in the existing focusing mechanism design, most of the moving lens groups adopt the "manual method", which is more convenient to use. If the focusing method of the lens is changed from manual to electromagnetic drive, the lens can focus automatically, and the mechanism design can be simplified at the same time. , but it will produce the problem of Electro Magnetic Interference (EMI), and for the current technology products such as mobile phones, notebook computers, PDA...etc., must comply with Electro Magnetic Interference (EMI), Electro Magnetic Compatibility EMC) and electrostatic protection (Electro Static Discharge, ESD) and other specifications, so if you use the electromagnetic drive method to focus, you must solve the problem of compliance with EMI, EMC and ESD specifications.

In order to solve the above-mentioned use of electromagnetically driven focusing lens and meet the requirements of EMI, EMC and ESD specifications, the inventor of this case has devoted himself to research and proposed a micro-lens electromagnetic interference prevention mechanism, which has the advantages of simplifying mechanism design and reducing production costs. The assembly process is expected to use this micro-focus structure on the camera modules of mobile phones, notebook computers, PDAs...etc.

Contents of the invention

The main purpose of the present invention is to provide a micro-lens electromagnetic interference prevention mechanism, which drives the carrier and the micro-lens to move in an electromagnetic driving manner to achieve the focusing function, and has the advantages of good driving efficiency, good assembly accuracy, and electromagnetic effect prevention.

In order to achieve the above object, the main technical features of the micro-lens electromagnetic interference prevention mechanism of the present invention include: a frame, four magnetic components are accommodated around; The assembly consists of an external fixed part and an internal movable part connected to each other with four sets of ninety-degree strings, the external fixed part is connected to the frame, and the inner movable part is connected to the bearing seat to form an elastic movable support bearing seat suspended in the center of the frame; an upper cover and a lower The cover is separately arranged on the upper and lower sides of the frame, and is fixedly connected to the elastic component on the frame; a metal outer cover covers the upper cover, the elastic component, the bearing seat, the outside of the frame and the lower cover, and at least one conductive tab is provided on the bottom to be electrically connected to the ground The terminal is used to isolate the electromagnetic effect generated externally by grounding, and also isolates external electromagnetic interference and electrostatic protection.

In order to achieve the above purpose, in the above-mentioned miniature lens electromagnetic interference prevention mechanism, the elastic component is made of metal, and an extension part is further provided, and the extension part is bent downward by 90 degrees, which serves as the positive and negative plates for the power supply of the coil component , so that the electrode plate and the elastic component are integrally formed to achieve the effect of saving space.

In order to achieve the above purpose, another technical feature of the micro-lens electromagnetic interference prevention mechanism is that when the bearing seat is not in motion, it will be limited by a downward stress generated by the elastic component, so that the bearing base will be pressed downward. Hold the top surface of the lower cover, so that the initial position of the bearing seat in any direction is fixed due to the downward stress of the elastic component.

In order to achieve the above purpose, another technical feature of the aforementioned miniature lens electromagnetic interference prevention mechanism is that a downwardly extending baffle plate is provided at each of the four corners of the lower edge of the bearing seat, and the lower cover corresponds to the position of the file board. There is also at least one rotation inhibiting hole, so that the baffle can just extend into the rotation inhibiting hole, preventing the bearing base from rotating due to external force.

In order to achieve the above purpose, another technical feature of the above-mentioned micro-lens electromagnetic interference prevention mechanism is that it further includes a movable part protection plate connected to the inner movable part of the elastic component, and at least one convex plate is provided on the outer edge; The upper cover is a hollow structure, and the inner edge corresponds to the outer edge of the protective plate of the movable part, and the inner edge corresponds to the position of the convex plate with a movable groove, so that the convex plate can only move within the movable groove. A vertical linear guide mechanism is formed, so that the bearing seat can only carry out vertical linear displacement in the upper cover due to the movable part protection plate and cannot rotate horizontally.

In order to achieve the above-mentioned purpose, another technical feature of the aforementioned miniature lens electromagnetic interference prevention mechanism is that a positioning column is respectively provided at the four corners of the upper cover, and the four corners of the elastic component, the frame and the lower cover correspond to the position of the positioning column Positioning holes are provided at each position, and the positioning columns can be inserted and accommodated in these positioning holes, so as to fix the relative positions of each component and achieve the effect of high assembly accuracy.

In order to achieve the above purpose, the final technical feature of the above-mentioned micro-lens electromagnetic interference prevention mechanism is: the bottom of the metal housing is provided with at least one set of symmetrical hooks, and the lower cover is provided with a set of engaging parts corresponding to the positions of the hooks , the hook can be closely combined with the engaging portion.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is an existing lens autofocus device;

Fig. 2 is the three-dimensional schematic diagram of the electromagnetic interference prevention and control mechanism for the miniature lens of the present invention;

3 is a three-dimensional exploded schematic view of the micro-lens electromagnetic interference prevention and control mechanism of the present invention;

Fig. 4 is a three-dimensional schematic diagram of an elastic component in the present invention;

Fig. 5 is an A-A cross-sectional schematic view of the micro-lens electromagnetic interference prevention mechanism of the present invention.

Among them, reference signs

201 Lens group 202 Light sensing component

10 Bearing seat 12 Bezel

20 Coil Assembly 30 Frame

31 Positioning hole 40 Magnetic assembly

50 Elastic component 51 Round hole

52 External fixed part 53 Internal movable part

54 Ninety chord 55 Extension

56 Positioning hole 60 Upper cover

61 Movable groove 62 Positioning post

70 Bottom cover 71 Rotation inhibition hole

72 Snapping part 73 Positioning hole

80 movable part protection plate 81 convex plate

90 metal cover 91 conductive tab

92 Hook 100 Micro Lens

Detailed ways

In order to enable the review committee to further understand the technology, means and effects of the present invention to achieve the intended purpose, please refer to the following detailed descriptions and accompanying drawings of the present invention. It is believed that the purpose, characteristics and characteristics of the present invention can be deepened and For specific understanding, however, the accompanying drawings are only for reference and illustration, and are not intended to limit the present invention.

As shown in Figure 2, it is a perspective view from above of the present invention, and Figure 3 is a three-dimensional exploded schematic view of the micro-lens electromagnetic interference prevention and control mechanism of the present invention, and the micro-lens electromagnetic interference prevention and control mechanism of the present invention includes a bearing seat 10 , a coil assembly 20 , a frame 30 , four magnetic assemblies 40 , at least one elastic assembly 50 , an upper cover 60 , a lower cover 70 , a movable part protection plate 80 , a metal cover 90 and a micro lens 100 .

The bearing seat 10 is used to carry the miniature lens 100. The center is a hollow shaft hole structure, and the inner edge of the shaft hole is provided with threads, which can be locked with the screw teeth on the outside of the lens 100 so as to lock the lens 100. in the hollow shaft hole of the bearing seat 10 . The bearing base 10 wraps the coil assembly 20 on the outside.

The frame 30 is a cubic hollow structure, and the four magnetic components 40, such as magnets, can be accommodated in the hollow spaces around the vertical plane, and the bearing base 10 is accommodated in the center of the hollow structure of the frame 30, and the bearing base 10 is only Vertical linear displacement within the frame 30 is possible.

Please also refer to FIG. 4 , which is a three-dimensional schematic view of the elastic component in the present invention. The elastic component 50 is flat, and the center is hollowed out into a circular hole 51 corresponding to the shaft hole of the bearing seat 10. The elastic component 50 is composed of a The outer fixed part 52 and an inner movable part 53 are connected with four sets of ninety-degree chords 54 to form a spring whose outer edge is fixed and the inner edge is elastically movable. Preferably, the elastic component 50 can include an upper plate spring and a lower plate spring. The outer fixed part 52 is respectively connected to the upper and lower ends of the frame 30, and the inner movable part 53 is respectively connected to the upper and lower ends of the bearing seat 10 to support the bearing seat 10 so that it is suspended and fixed in the center of the frame 30. The elastic The inner movable part 53 of the component 50 uses a spring composed of four sets of ninety-degree strings 54 to allow the bearing seat 10 to absorb impact, vibration, and falling average forces in the X, Y, and Z directions.

In addition, the upper plate elastic piece and the lower plate elastic piece are made of metal, are electrically connected to the positive and negative terminals of the coil assembly respectively, and each has an extension part 55, which can be bent downward by 90 degrees, downward Extended and electrically connected to the circuit board (not shown in the figure), as the positive and negative plates for the power supply of the coil assembly 20, the power supply plate and the elastic assembly 50 are integrally formed to achieve the effect of saving space.

The upper cover 60 and the lower cover 70 are respectively arranged on the upper and lower sides of the frame 30, and can be fixedly connected to the elastic component 50 on the frame 30. Please refer to FIG. 3 and FIG. 5 together, which are A-A sections of FIG. 2 Schematic diagram, when the bearing seat 10 is not in action, it will be limited by a downward stress generated by the elastic component 50, so that the bearing base 10 is pressed against the top surface of the lower cover 70 downwards, so that the bearing base 10 no matter faces Upward placement, downward placement or horizontal placement will all be fixed by the downward stress of the elastic component 50, so that the initial position of the supporting base 10 in any direction will not produce vertical shaking and displacement.

The four corners of the lower edge of the bearing seat 10 are each provided with a downwardly extending baffle plate 12, and the lower cover 70 is further provided with at least one rotation inhibiting hole 71 corresponding to the position of the file board 12, and the baffle plate 12 can just extend Insert into the rotation inhibiting hole 71 to prevent the bearing base 10 from rotating due to external force.

The movable part protection plate 80 is further provided between the upper cover 60 and the bearing seat 10, which is connected to the inner movable part 53 of the elastic component 50 and linked to the bearing base 10. The center of the upper cover 60 is a hollow structure. , and the inner edge corresponds to the outer edge profile of the movable part protection plate 80, the outer edge of the movable part protective plate 80 is provided with at least one convex plate 81, and the inner edge of the upper cover 60 corresponds to the position of the convex plate 81. There is a movable groove 61, so that the convex plate 81 can only move within the movable groove 61, forming a vertical linear guide mechanism, so that the bearing seat 10 can only move in the upper cover 60 due to the movable part protection plate 80 Perform vertical linear displacement without horizontal rotation.

The four corners of the upper cover 60 are respectively provided with a positioning column 62, and the four corners of the elastic component 50, the frame 30 and the lower cover 70 are respectively provided with positioning holes 56, 31 and 73 corresponding to the position of the positioning column 62, The positioning column 62 can pass through and be accommodated in the positioning holes 56 , 31 and 73 to fix the relative positions of the components and achieve the effect of high assembly accuracy.

The metal cover 90 is coated on the outside of the bearing seat 10, the frame 30, the elastic component 50, the upper cover 60 and the lower cover 70, and at least one conductive tab 91 is arranged at the bottom. The conductive tab 91 is electrically connected to the ground terminal of the circuit board (not shown in the figure), and isolates the electromagnetic effect generated by the coil assembly 20 and the magnetic assembly 40 by grounding, and can also isolate external electromagnetic interference and electrostatic protection. .

The bottom of the metal cover 90 is provided with at least one set of symmetrical hooks 92 , and the lower cover 70 is provided with a set of locking parts 72 corresponding to the positions of the hooks 92 , and the hooks 92 can be closely combined with the locking parts 72 .

When the micro-lens electromagnetic interference prevention mechanism of the present invention is actuated, the current is conducted to the coil assembly 20 through the elastic assembly 50, so that the coil assembly 20 generates a magnetic field and has a thrust, and drives the bearing seat 10 in the frame 30 in a vertical direction. The linear displacement movement fixes the bearing seat 10 and the miniature lens 100 at the focusing position to complete the focusing action.

To sum up, the present invention utilizes the above-mentioned structure to drive the bearing seat and the micro-lens to move in an electromagnetic driving manner to achieve the focusing function, and has the advantages of good driving efficiency, good assembly accuracy, and prevention of electromagnetic effects. The disclosed technology provides a design that is completely different from the existing ones, which can improve the overall use value, and it has not been published or publicly used before the application, and it has met the requirements of the invention patent, and the invention patent application is filed according to law.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (7)

1. A micro-lens electromagnetic interference prevention and control mechanism, characterized in that it comprises: A frame, which is a cubic hollow structure, and four magnetic components are accommodated in the hollow space around the vertical plane; A bearing seat with a hollow shaft hole structure, a miniature lens is carried in the shaft hole, and a coil assembly is covered on the outside; At least one elastic component is in the shape of a flat plate, and the center is hollowed out to form a round hole corresponding to the shaft hole of the bearing seat. Four sets of ninety-degree strings are connected to each other by an outer fixed part and an inner movable part. The outer fixed part is connected to the frame, and the inner movable part Connecting the bearing seat to form an elastic movable support to suspend the bearing seat in the center of the frame; An upper cover and a lower cover are respectively arranged on the upper and lower sides of the frame, and are fixedly connected to the elastic component on the frame; A metal outer cover covers the upper cover, the elastic component, the bearing seat, the frame and the outer part of the lower cover, and at least one conductive tab is provided on the bottom to be electrically connected to the ground. 2. The miniature lens electromagnetic interference prevention mechanism according to claim 1, wherein the elastic component can include an upper flat elastic piece and a lower flat elastic piece, and its external fixing parts are respectively connected to the upper and lower ends of the frame, The inner movable part is respectively connected to the upper and lower ends of the bearing seat. 3. The micro-lens electromagnetic interference prevention mechanism according to claim 2, wherein the upper plate elastic piece and the lower plate elastic piece are made of metal, and the upper elastic component and the lower plate elastic piece are electrically connected to the coil assembly respectively. The positive and negative terminals are respectively provided with an extension part which is bent downward by 90 degrees, extends downward and is electrically connected to the circuit board. 4. The micro-lens electromagnetic interference prevention mechanism according to claim 1, wherein a downwardly extending baffle plate is provided at each of the four corners of the lower edge of the bearing seat, and the lower cover corresponds to the position of the file board At least one rotation inhibiting hole that can extend into the rotation inhibiting hole is further provided. 5. The micro-lens electromagnetic interference prevention mechanism according to claim 1, further comprising: A movable part protection plate, located between the upper cover and the bearing seat, connected to the inner movable part of the elastic component, with at least one convex plate on the outer edge; The upper cover is a hollow structure, and the inner edge corresponds to the outer edge contour of the movable part protection plate, and is provided with a movable groove for the convex plate to move inside. 6. The micro-lens electromagnetic interference prevention mechanism according to claim 1, wherein the four corners of the upper cover are respectively provided with a positioning column, and the four corners of the elastic component, the frame and the lower cover correspond to the positioning columns Each position is provided with a positioning hole, and the positioning column can be inserted and accommodated in the positioning hole. 7. The micro-lens electromagnetic interference prevention mechanism according to claim 1, wherein at least one set of symmetrical hooks is provided at the bottom of the metal housing, and a set of movable hooks is protruded from the lower cover corresponding to the positions of the hooks. An engaging part closely combined with the hook.

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