CN201116960Y

CN201116960Y - Camera lens die set capable of automatic focusing

Info

Publication number: CN201116960Y
Application number: CNU2007201822634U
Authority: CN
Inventors: 鲁大鹏; 李守鑫
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2007-11-14
Filing date: 2007-11-14
Publication date: 2008-09-17
Anticipated expiration: 2017-11-14

Abstract

The utility model provides a camera lens die set which can automatically focus and comprises a lens mount, a base component, an electromagnetic driving structure, a limited structure on the lens mount and a limited guide path on an upper end cover. The electric inductance force is evenly effected on the lens mount through under the drive of the electromagnetic force which is produced by the electromagnetic driving structure of the utility mode and through fixed iron cores which are evenly arranged on the lens mount, and the resultant force cooperates with the limited guide path on the upper end cover and the limited structure on the lens mount simultaneously along the light axis direction to move the lens mount along the light axis direction. The attractive force which is produced between a permanent magnet body on the electromagnetic driving structure and a cylinder-shaped easily magnetized easily demagnetized component is utilized to balance the electromagnetic force, and thereby automatic focusing process is realized. Compared with an existing technique, the die set of the utility model is evenly effected on the lens mount through the electromagnetic force, the resultant force is cooperated with the limited structure on the lens mount and the limited guide path on the upper end cover along the light axial direction to effectively overcome the shake of the lens which is produced in the automatic focusing process.

Description

But the pick-up lens module of automatic focusing

Technical field

The utility model relates to camera focusing technical field, relates in particular to the device of pick-up lens automatic focusing.

Background technology

Technology of auto is widely used in video camera, in a lot of portable electric appts such as camera, having overcome traditional camera module mostly is during image in acquisition and focuses or manual focusing, automatically the pick-up lens module volume of focusing is little, simple in structure, it is built in the various portable electric appts, bring many convenience to people's life, along with people's growth of requirement, to the focusing equipment also in light weight, the little development of volume, existing technology of auto moves by the motor driven lens combination, change lens combination and photosensitive device (CCD, CMOS etc.) distance between, thereby reach the automatic focusing purpose, the voice coil motor that perhaps utilizes coil directly to combine with iron core and constitute replaces motor, as Chinese patent CN200520127450, the open date: on October 18th, 2006, name is called to disclose in " a kind of cell-phone camera camera lens module and comprise the mobile phone of this module " by one group of coil directly combine the voice coil motor that the constitutes generation electromagnetic force of switching on iron core and promotes lens combination and move, utilize shell fragment to produce restoring force and restPose, thereby realize the automatic focusing purpose.Though this method can realize automatic focusing, in the automatic focusing process, be easy to produce the focus shake.

The utility model content

But the utility model proposes a kind of pick-up lens module of automatic focusing, its objective is to solve prior art produces shake in the focusing process deficiency.

In order to solve the problems of the technologies described above, but the utility model provides a kind of pick-up lens module of automatic focusing, this module comprises lens mount, base assembly, the Electromagnetic Drive structure, described Electromagnetic Drive structure comprises a permanent magnet, first easy magnetization element that easily demagnetizes, outside first coil, at least also comprise second easy magnetization easily the demagnetize element and second coil, described lens mount is provided with position limiting structure, be provided with spacing gathering sill in the described upper end cover, described base assembly comprises upper end cover, base, easily a demagnetize end and the lens mount of element of easy magnetization in the wherein said Electromagnetic Drive structure fixed, and the other end is positioned in the coil that is fixed on the permanent magnet; Described lens mount and Electromagnetic Drive structure are placed in the base assembly successively.Described Electromagnetic Drive structure is to utilize electromagnetic induction principle work, produce electromagnetic force by the Electromagnetic Drive structure, the energy equilibrium activity cooperates symmetrically arranged position limiting structure and the inboard spacing gathering sill that is provided with of upper end cover on the lens mount again on lens mount, lens mount is moved along optical axis direction all the time.

The utility model advantage is to make camera lens to move stably in the automatic focusing process, can not produce off-centre, thereby can effectively avoid the camera lens jitter phenomenon to take place.

Description of drawings

Fig. 1 is the exploded perspective view of the utility model first embodiment;

Fig. 2 is the profile synoptic diagram of the utility model first embodiment;

Fig. 3 is the diagrammatic cross-section of the utility model first embodiment original state;

Fig. 4 is the diagrammatic cross-section after the utility model first embodiment focusing;

Fig. 5 is the utility model second embodiment lens mount upper core hole and position limiting structure synoptic diagram;

Fig. 6 is the utility model second embodiment Electromagnetic Drive structural representation;

Fig. 7 is the utility model second embodiment upper end cover upper limit gathering sill structural representation;

Fig. 8 is the lens mount structural representation among the utility model the 3rd embodiment;

Fig. 9 is elasticity position of components and a structural representation among the utility model the 4th embodiment;

Figure 10 is the diagrammatic cross-section of the utility model the 4th embodiment original state;

Figure 11 is the diagrammatic cross-section after the utility model the 4th is implemented focusing.

Technical solutions of the utility model, performance, advantage will be in conjunction with the embodiments, is described further with reference to description of drawings.

Embodiment

See figures.1.and.2, but the camera module of the automatic focusing of the utility model first embodiment is proposed, this camera module comprises lens assembly 1, base assembly 2, Electromagnetic Drive structure 3, wherein said lens assembly 1 comprises camera lens 11, lens mount 12, described base assembly 2 comprises upper end cover 21, base 22, described Electromagnetic Drive structure 3 comprises a permanent magnet, four identical coils 32 (321,322,323,324, do not mark in the diagram), establishing coil 321 is first coil, coil 322 is second coil, coil 323 is a tertiary coil, coil 324 is the 4th coil; Four identical cylindrical easy magnetizations element 3 that easily demagnetizes is selected iron core 31 (311,312,313,314 do not mark in the diagram) for use, if iron core 311 is first iron core, iron core 312 is that second iron core, iron core 313 are that the 3rd iron core, iron core 314 are the 4th iron core), permanent magnet is selected permanent magnet 33 for use.

As shown in Figure 3, described lens assembly 1, Electromagnetic Drive structure 3 are positioned in base assembly 2, upper end cover 21 and the base 22 successively, are used to accommodate support guide and protective effect.

As shown in Figure 1, eyeglass 13 places in the rotating cylinder 14, rotating cylinder 14 by its external thread structure with constitute by a cylinder and a square structure, and connect along the lens mount 12 that central shaft is provided with tapped through hole 15; Described four identical iron core 31 1 ends are individually fixed in four identical holes 16 (161,162,163,164 that the square structure on the lens mount 12 is provided with, do not mark in the diagram) in, the other end is positioned over respectively in the hole 35 (351,352,353,354, do not mark in the diagram) that is fixed with coil 32; Described permanent magnet 33 centers are provided with a hole 34, the center is arranged with four identical coils 32 fixing spacing holes 35 that are used for around 34 in the hole, be fixed with the coil 32 suitable with the degree of depth in hole 35 in hole 35 respectively, wherein permanent magnet 33 1 end faces are fixed on the base 22 of forming base assembly 2; Four jiaos of outward flanges of square structure on the described lens mount 12 also are provided with the position limiting structure 17 (171,172,173,174, do not mark in the diagram) of four groups of identical circular arcs.

Described upper end cover 21 groove inboards be provided with four groups with described lens mount 12 on the position limiting structure 17 spacing gathering sill 24 (241,242,243,244 that is complementary, do not mark in the diagram), be respectively equipped with through hole 23 and wire-protecting lid 25 in upper end cover 21 centers and side, an end face that contacts with base 22 at described upper end cover 21 also is provided with the dustproof groove that cooperates with base; Described base 22 be one with upper end cover 21 structure that is complementary, be respectively equipped with through hole 28 and metallic channel 27 at base 22 position of center line and side, at the base 22 1 end faces dirt groove 26 of setting up defences, the position at described through hole 28 edges and placement 35 positions, permanent magnet 33 fixed coil holes also are respectively equipped with dustproof groove, and in dustproof groove, inject adhesive sticker, the micronic dust that module can be produced in the process that moves adheres to, and prevents that micronic dust from entering.

Compared with prior art, four angles of the square structure of present embodiment on lens mount 12 are arranged with four holes 16 and are used for fixing columniform iron core 31, because four holes 16 are symmetrically distributed on the lens mount 12, four identical iron cores 31, coil 33, the identical electromagnetic force that in Electromagnetic Drive structure 3, can produce, act on the dynamic balance of the four direction on the lens mount 12, its resultant direction is along optical axis direction, can not produce the shake that in moving process, produces by lens mount 12 that causes by single electromagnetic force, the spacing gathering sill 24 on the position limiting structure 17 that is provided with in conjunction with the square structure corner location on the lens mount 12 and the upper end cover simultaneously, make lens mount under the electromagnetic force effect of balance, cooperate by position limiting structure 17 and spacing gathering sill 24, because position limiting structure 17 can well be limited in the spacing gathering sill 24, thereby guarantee that lens mount 12 moves along optical axis direction, can avoid unnecessary shake in the automatic focusing process.

Utilize the attractive force conduct of 33 pairs of columniform iron cores 31 generations of permanent magnet and the equilibrant of electromagnetic force in the focusing process, attractive force is recovered the power of initial positions as lens mount 12 between permanent magnet after the power cut-off 33 and columniform iron core 31; Described columniform iron core 31 can also be selected iron, cobalt, nickel for use, and the demagnetization material that is magnetized easily easily such as the combination between them is made.

On the basis of first embodiment, the utility model proposes second embodiment, as shown in Figure 5 and Figure 6, the hole 16 that is used for fixing columniform iron core 31, can also be that square structure on lens mount 12 is symmetrical arranged two holes 16 (161,162 do not mark in the diagram) along diagonal line with centre section, establish two groups position limiting structure 17 (171,172 do not mark in the diagram) on the lens mount 12; Coil 32 in the Electromagnetic Drive structure 3 is made as two (321,322 do not mark in the diagram), and establishing coil 321 is first coil.Coil 322 is second coil, iron core 31 is made as two (311,312 do not mark in the diagram), if iron core 311 is first iron core, iron core 312 is second iron core, the hole 35 that is used for fixing coil 32 on the permanent magnet 33 is made as two (351,352 do not mark in the diagram), as shown in Figure 7, spacing gathering sill 24 on the upper end cover 21 also is made as two group (241,242 do not mark in the diagram) mate with described position limiting structure 17, other structures and annexation thereof do not change, also can make lens mount 12 at electromagnetic force equilibrium effect lower edge optical axis direction, can avoid unnecessary shake thereby reach in the automatic focusing process.

The utility model also proposes the 3rd embodiment on the basis of first embodiment, shows with reference to Fig. 8, and lens mount 12 is made of lens barrel and square structure, and square structure is located between the both ends of the surface of lens barrel, and the lens barrel inboard is provided with screw thread.Structure that other are relevant and described lens mount 12 couplings, each module position and annexation do not change, and can make lens mount 12 at electromagnetic force equilibrium effect lower edge optical axis direction yet, can avoid unnecessary shake thereby reach in the automatic focusing process.

Above-mentioned three embodiment automatic focusing processes are: as shown in Figure 2, closely during contact condition, be made as original state between lens mount 12 and the permanent magnet 33.As shown in Figure 4, when automatic focusing begins, after 32 energisings of coil in the Electromagnetic Drive structure 3, Electromagnetic Drive structure 3 produces inductive forces, because of columniform iron core is symmetricly set on the lens mount 12, and make electromagnetic force act on the lens mount 12, it is made a concerted effort along optical axis direction, lens assembly 1 is by the position limiting structure 17 of

lens mount

12 and 24 spacing cooperations of spacing gathering sill of upper end cover 21 inboards simultaneously, lens assembly 1 is moved along optical axis direction, the attractive force of

permanent magnet

33 and 31 existence of columniform iron core can play the balance electromagnetic force in the focusing process, finishes the automatic focusing action; When end-of-job, the inductive forces in the Electromagnetic Drive structure disappears, and the attractive force between permanent magnet 33 and the columniform iron core 31 returns to original state as shown in Figure 3 with lens assembly, finishes the automatic focusing process.

The utility model also proposes the 4th embodiment on the basis of first embodiment, with reference to shown in Figure 9, between lens mount 12 and permanent magnet 33, establish a flexible member 4, described flexible member 4 is made up of an interior circle 41 and an outer circle 42, the flexible connection of inside and outside two circles position, circles 41 are connected and fixed with lens mount 12 in the flexible member 4, and the set up defences end face of dirt groove 26 of outer circle 42 and base 22 is connected and fixed, and flexible member 4 is provided with the hole that is used for by iron core 31.Flexible member described in the present embodiment 4 can be that ester film, nylon film, rubber film or polyamides come amine film etc. other can produce the restoring force material and makes.

Present embodiment automatic focusing process is: as shown in figure 10, tight contact condition is made as original state between lens mount 12 and flexible member 4, the permanent magnet 33, and any deformation does not take place flexible member 4.As shown in figure 11, when automatic focusing begins, after 32 energisings of coil in the Electromagnetic Drive structure, iron core 31 and coil 32, permanent magnet 33 produces inductive forces, make that the spacing gathering sill 24 of the position limiting structure 17 of lens assembly 1 by lens mount 12 and upper end cover 21 inboards is spacing to be cooperated when optical axis moves, deformation takes place and produces restoring force in flexible member 4, make lens mount 12 to permanent magnet 33 direction movement tendencies, the attractive force of

permanent magnet

33 and 31 existence of iron core and flexible member 4 produce making a concerted effort of elastic force in the focusing process simultaneously, can play the balance electromagnetic force, the camera lens of making a concerted effort during balance of elastic force that produces when electromagnetic force and flexible member 4 and the attractive force between permanent magnet 33 and the iron core 31 is finished automatic focusing and is moved; When end-of-job, the inductive forces in the Electromagnetic Drive structure 3 disappears, and the attractive force between permanent magnet 33 and the iron core 31 and the elastic force of flexible member 4 return to original state as shown in figure 10 with lens assembly 1, finish the automatic focusing process.

Above-mentioned enforcement only is four kinds of embodiment of the utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model instructions and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.

Claims

1, but a kind of pick-up lens module of automatic focusing, this module comprises lens assembly, base assembly, the Electromagnetic Drive structure, wherein said lens assembly comprises lens mount, camera lens, described base assembly comprises upper end cover, base, described Electromagnetic Drive structure comprises a permanent magnet, first easy magnetization easily the demagnetize element and first coil, described camera lens is connected with lens mount, it is characterized in that: described Electromagnetic Drive structure at least also comprises second easy magnetization easily the demagnetize element and second coil, described lens mount is provided with position limiting structure, be provided with spacing gathering sill in the described upper end cover, easily a demagnetize end and the described lens mount of element of described easy magnetization fixed, the other end passes the permanent magnet that is provided with the fixed coil hole, and wherein said lens mount and Electromagnetic Drive structure are positioned in the base assembly successively.

2, the pick-up lens module of automatic focusing according to claim 1, it is characterized in that, at least be arranged with two position limiting structures on the described lens mount, described upper end cover inboard is provided with and the spacing gathering sill that position limiting structure quantity is identical and structure is complementary on the lens mount.

3, the pick-up lens module of automatic focusing according to claim 1 and 2 is characterized in that, described upper end cover is provided with wire-protecting lid, and an end face is provided with dustproof groove, and described base is provided with a metallic channel and dustproof construction.

4, the pick-up lens module of automatic focusing according to claim 1 and 2 is characterized in that, described lens mount is made of lens barrel and square structure, and square structure is located between the both ends of the surface of lens barrel, and the lens barrel inboard is provided with screw thread.

5, the pick-up lens module of automatic focusing according to claim 4 is characterized in that, is arranged with two holes on the described lens mount at least.

6, the pick-up lens module of automatic focusing according to claim 1 is characterized in that, the described easy magnetization element that easily demagnetizes is the cylindrical-shaped structure that iron core or iron, cobalt, nickel are made.

7, the pick-up lens module of automatic focusing according to claim 1 is characterized in that, described permanent magnet center is provided with a hole, at least also is provided with two center symmetrical holes on every side in described hole, and its external diameter is slightly larger than coil outer diameter, and the degree of depth and loop length are suitable.

According to the pick-up lens module of claim 1 or 7 described automatic focusings, it is characterized in that 8, described permanent magnet is a permanent magnet.

9, the pick-up lens module of automatic focusing according to claim 1, it is characterized in that, between described lens mount and base, be provided with a flexible member, described flexible member is made up of an interior circle and an outer circle, the flexible connection of inside and outside two circles position, circle and lens mount are connected and fixed in the flexible member, and outer circle and base are fixed.