WO2007090331A1 - Lens module with parallel driving hanging device - Google Patents

Abstract

A lens module with parallel driving device includes a fixed base (10) ; a lens assembly (20) arranged on the fixed base (10) ; an electromagnetic assembly (30) comprised of at least one magnet group (32) , at least one yoke (31) and a coil (33) ; wherein the magnet group (32) and the yoke (31) are arranged on the fixed base (10), the coil (33) is arranged on the circumference of the lens assembly (20) so that the magnet group (32) , the yoke (31) and the coil (33) form a magnetic field space, the current flowing through the coil (33) makes the lens assembly (20) move parallel, and the movement direction of the lens assembly (20) can be changed by changing the direction of the current; a hanging assembly (40) which is fixed to the lens assembly (20) and the fixed base (10), respectively; a guide member (50) contacting with the lens assembly (20) , for guiding the movement direction of the lens assembly (20).

Description

 Lens module with parallel drive suspension device

 The present invention relates to a lens module having a parallel drive suspension device, and more particularly to a lens module for a focus or zoom device that requires parallel movement in an image capture system. Background technique

 General digital imaging products, such as digital cameras, cell phone cameras or digital cameras, have been regarded as important devices for image capture and storage. In the structure of these products, lens modules are included. Convert an optical image to a digital image signal.

 In the lens module of the high-quality image capturing device, in addition to a lens assembly and an image sensing module (such as CCD, CMOS), a focus actuator is required to drive the lens assembly in parallel. The focus deviation correction of the lens optical axis allows the optical image to be correctly focused on the image sensing module.

 However, most of the current focus or zoom actuators use a screw mechanism or a shrapnel mechanism (such as US Patent Publication No. US 2004/0130108 A1) to support the lens assembly for parallel motion to achieve offset correction. Not only is the cost higher, but the tilt angle produced by the lens assembly during translation is also difficult to control. With the continuous development of high-pixel products, the performance requirements of the lens module for focus correction or zoom function are becoming more and more demanding. High, so the well-known institutions have been unable to meet the needs of development. Summary of the invention

 SUMMARY OF THE INVENTION An object of the present invention is to provide a lens module having a parallel drive suspension device of a focus or zoom system having a simple structure, a low cost, and a minimum tilt angle of lens lens movement.

 In order to achieve the above object, a lens module having a parallel driving suspension device of the present invention comprises an electromagnetic driving assembly, a lens assembly and a suspension assembly; the parallel driving suspension device is mainly provided for the lens to move in parallel, and An optical axis passing through the lens can be defined, and the direction of the magnetic force generated by the electromagnetic driving component is the same as the direction of the optical axis, so that the lens assembly moves in the extending direction of the optical axis by the parallel mechanism provided by the suspension device. DRAWINGS

 1A is a side view of the mechanism principle before parallel movement of the present invention;

 Figure 1B is a side view of the mechanism principle of the parallel movement of the present invention;

 2 is a top plan view of a mechanism for parallel movement of the present invention;

Figure 3 is an exploded perspective view of a preferred embodiment of the present invention; Figure 4 is a partially exploded perspective view of a preferred embodiment of the present invention;

 Figure 5 is a combination view of a suspension device according to a preferred embodiment of the present invention;

 Figure 6A is a bottom plan view of a preferred embodiment of the present invention;

 Figure 6B is a side view of a preferred embodiment of the present invention;

 Figure 7 is a sectional view taken along line 7-7 of Figure 6A;

 Figure 8 is a cross-sectional view taken along line 8-8 of Figure 6A;

 Figure 9 is a cross-sectional view taken along line 9-9 of Figure 6A;

 Figure 10 is a cross-sectional view taken along line 10-10 of Figure 6B;

 Figure 11 is a schematic view of another preferred embodiment of the present invention. In the drawings, the list of parts represented by each label is as follows:

 1 movable part 2, 3 elastic body

 4 fixing part 5 guide rod

 6 grooves

 10 fixed base 11 room

 12 through holes 13 grooves

 14 printed circuit board 21 objective lens

 22 objective carrier 221 housing hole

 222 ring groove 223, 224 suspension end

 225 guide 30 electromagnetic drive assembly

 31 yoke 33 coil

 40 suspension assembly 41 elastic conductor

 50 guide 32 magnet group

 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be further described with reference to the accompanying drawings, in which: FIG.

 1A is a side view of the mechanism principle before parallel movement of the present invention;

 1B is a side view of the mechanism principle of the parallel movement of the present invention;

 2 is a top plan view of a mechanism for parallel movement of the present invention;

 Figure 3 is an exploded perspective view of a preferred embodiment of the present invention;

 Figure 4 is a partially exploded perspective view of a preferred embodiment of the present invention;

Figure 5 is a combination view of a suspension device according to a preferred embodiment of the present invention; Figure 6A is a bottom plan view of a preferred embodiment of the present invention;

 Figure 6B is a side view of a preferred embodiment of the present invention;

 Figure 7 is a sectional view taken along line 7-7 of Figure 6A;

 Figure 8 is a cross-sectional view taken along line 8-8 of Figure 6A;

 Figure 9 is a cross-sectional view taken along line 9-9 of Figure 6A;

 Figure 10 is a cross-sectional view taken along line 10-10 of Figure 6B;

 Figure 11 is a schematic view of another preferred embodiment of the present invention. First, please refer to FIG. 1 and FIG. 2, which are schematic diagrams of the mechanism for parallel movement of the present invention, wherein FIGS. 1A and B illustrate the basic relationship between a suspension device and its parallel movement, and the suspension device has a movable portion 1 . The movable portion 1 is suspended by a fixed length of two elastic bodies 2, 3 of equal length, which constitutes a moving mechanism on the plane, but the mechanism will eventually generate a degree of freedom of rotation in the three-dimensional space; therefore, please Referring to FIG. 2, a shaft-shaped guide rod 5 is disposed on the fixing portion 4, and the movable portion 1 is provided with a groove 6, and the outer edge of the guiding rod 5 is matched with the groove 6 on the movable portion 1. The mechanism for causing the suspension device to form a parallel movement in the space, as shown in FIG. 1B, is such that it has a translational limitation of the guide shaft and the two elastic bodies, so that the lens can be prevented from being inclined during the movement, thereby providing accurate The function of focusing, zooming or panning the objective.

 According to the above mechanism principle, a lens module having a parallel driving suspension device, as shown in FIG. 3 to FIG. 10, includes a fixed base 10, a lens assembly 20, an electromagnetic driving assembly 30, and a lens module. Suspension assembly 40 and a guide member 50, wherein;

 The fixed base 10, 4 is a square-shaped housing, and has a cavity 11 in the interior thereof, a through hole 12 is defined in the upper portion, and a recess 13 is defined in the sidewall of the fixed base 10 for fixing a printed circuit board 14, the printed circuit board 14 having a specific circuit structure;

 The lens assembly 20 is disposed in the through hole 12 in the cavity 11 of the fixed base 10, has an objective lens 21 and an objective lens carrier 22, and defines an optical axis direction passing through the objective lens 21, and the objective lens carries The housing 22 is provided with a receiving hole 221, and the receiving hole 221 is configured for the objective lens 21 to be coupled, so that the objective lens carrier 22 can be glued, the shaft hole is precisely matched or the screw is combined with the objective lens 21. The combination of the objective lens 21 and the objective lens carrier 22 produces a synchronous movement; in addition, the outer circumference of the objective lens carrier 22 is provided with a ring groove 222, and the top end and the bottom end of the objective lens carrier 11 are respectively provided with a hanging end portion 223, 224, in addition, the objective lens carrier 22 is provided with a guiding portion 225, and the guiding portion 225 has a circular or elliptical guiding hole or a fixed width sliding slot;

The electromagnetic drive assembly 30 has a yoke 31, a magnet group 32 and a coil 33. After the yoke 31 is adhesively bonded to the magnet group 32, the yoke 31 and the magnet group 32 are fixed to the electromagnetic yoke 31. Fixing the base 10 in the chamber 11; in addition, the coil 33 is wrapped around the objective lens holder a ring groove 222 of 22, and connecting the two lead ends of the coil 33 to the hanging end portions 223, 224 of the objective lens holder 22; thereby, the yoke 31, the magnet group 32 and the objective lens holder The coil 33 of 22 forms a magnetic field space and generates a magnetic force direction which is the same as the optical axis direction of the objective lens 21, and the magnetic field space covers the movable range of the carrier 22 of the objective lens 7 by the current passing through the coil 33. The objective lens carrier 22 is translated in translation, and the direction of movement of the objective lens carrier 22 can be changed by changing the direction of the current;

 The suspension assembly 40 has two elastic conductors 41 of the same length, and each of the elastic conductors 41 has the dual characteristics of an elastic body and a conductor, and two ends of the suspension conductors are respectively fixed to the two suspensions of the objective lens carrier 22 by welding. The end portions 223, 224 and the printed circuit board 14 of the fixed base 10, the above structure forms a closed parallelogram in terms of spatial characteristics, such that the elastic conductor 41 forms a main component for suspending the lens assembly 20, and additionally In terms of sexual characteristics, the elastic conductor 41 is connected to the suspension ends 223, 224 of the objective lens holder 22, and is in electrical communication with the two lead ends of the coil 33, so that current can be borrowed from the printed circuit board 14. The elastic conductor 41 is electrically connected to the coil 33 and forms a current loop;

 The guide member 50 is a fixed diameter shaft or a fixed width guide rail and defines an axis. In this embodiment, a guide rod having a circular cross section is fixed to the fixed base 10 by inserting. The guiding member 50 can also be integrally formed with the fixing base 10; the guiding member 50 is received in the guiding portion 225 of the objective lens carrier 22 such that the guiding member 50 and the lens assembly 20 are The contact is made, and the axis of the guiding member 50 is perpendicular to the normal of the plane of the parallelogram formed by the two elastic conductors 41, and parallel with the translation direction of the lens assembly 20, restricting the rotational movement of the lens assembly 20. And moving up and down the line on the guide member 50.

 According to the assembly of the above device, according to Ampere's law, the coil 33 is energized in the magnetic field space by the elastic conductor 41 to generate a force for driving the lens assembly 20, and the direction of the driving force can be changed by changing the direction of the current, so The lens assembly 20 is capable of focusing or zooming up and down.

 Referring to FIG. 11, a schematic view of another preferred embodiment of the present invention, which is different from the above embodiment, is a guide member 50' having a square cross section.

 Therefore, the present invention has the advantages of simple structure and low cost by the parallel driving suspension device described above, and at the same time, the lens can be prevented from being tilted during motion, thereby providing accurate focusing, zooming or translating objective functions. .

In addition, in an extended aspect of the present invention, in the above embodiments, the number of the guiding members 50 is one and distributed at one circumference of the lens assembly 20, and in fact, the number of guides may be two or more. The lead member 50 is equiangularly spaced at a plurality of circumferences of the lens assembly 20 to provide a more precise function of focusing, zooming or translating the objective lens. Further, the present invention may also be provided with a plurality of lens assemblies, electromagnetic drive assemblies, and suspensions. Hanging components and guides to form multiples in a single direction in space A lens moving device that moves (such as a lens zoom device) or multiple movable members (such as an anti-shake device).

 The above description is only a preferred embodiment of the present invention, and equivalent structural changes to the scope of the present invention and the scope of the claims are intended to be included in the scope of the invention.

Claims

Claim A lens module having a parallel drive suspension device, comprising:  a fixed base;  a lens assembly disposed on the fixed base;  An electromagnetic drive assembly is composed of at least one magnet group, at least one yoke, and a coil; wherein the magnet group and the yoke are disposed on the fixed base, and the coil is disposed on a periphery of the lens assembly, such that The yoke and the coil form a magnetic field space, the current passing through the coil causes the lens assembly to move in translation, and the direction of movement of the lens assembly can be changed by changing the direction of the current;  a suspension assembly is respectively fixed on the objective lens assembly and the fixed base;  A guiding member is in contact with the lens assembly for guiding the moving direction of the lens assembly. 2. The lens module with a parallel driving suspension device according to claim 1, wherein the lens assembly has an objective lens and an objective lens carrier, and the objective lens carrier is provided with a receiving hole, and the receiving hole is provided. The objective lens is worn and combined.  3. The lens module with a parallel driving suspension device according to claim 2, wherein an outer circumference of the objective lens carrier is provided with a ring groove for winding the coil.  4. The lens module with a parallel drive suspension device according to claim 1, wherein the suspension assembly has two elastic conductors.  5. The lens module with a parallel drive suspension device according to claim 4, wherein the lens assembly is provided with two suspension ends for winding the lead ends of the coils while fixing the elastic conductors.  6. The lens module with a parallel drive suspension device according to claim 1, wherein the lens assembly has a guiding portion for the guiding member to pass through.  The lens module with a parallel driving suspension device according to claim 5, wherein two ends of the two elastic conductors are respectively fixed to the two hanging ends of the lens assembly and the fixed base, the two The elastic conductors are of the same length to form a closed parallelogram.  8. The lens module as claimed in claim 7, wherein the fixed base further comprises a printed circuit board electrically connected to the two elastic conductors.  9. The lens module with a parallel drive suspension device according to claim 7, wherein an axis of the guide member is perpendicular to a normal line of a plane in which the parallelograms of the two elastic conductors are formed, and the lens assembly is The translation directions are parallel to each other.  The lens module with a parallel driving suspension device according to claim 6, wherein the guiding member is a guide rail, and the guiding portion is a sliding slot, so that the lens bearing portion can be guided by the guiding device Move on a piece or rail in a straight line.