CN100394239C

CN100394239C - Varifocus lens device

Info

Publication number: CN100394239C
Application number: CNB2005101066628A
Authority: CN
Inventors: 赖建男
Original assignee: Asia Optical Co Inc
Current assignee: Asia Optical Co Inc
Priority date: 2005-09-23
Filing date: 2005-09-23
Publication date: 2008-06-11
Anticipated expiration: 2025-09-23
Also published as: CN1936642A

Abstract

The invention provides a focal variation lens device including the bearing seat, the rotated focusing ring connected to the bearing seat, the lens room located in the focusing ring, the elastic gasket and the cover. The matched displacement guide rail and the sliding part are set between the focusing ring and the bearing seat. The sliding part can move along with the displacement guide rail to drive the focusing ring move comparing to the bearing seat. At the same time, lens room can move with the focusing ring and generates the axis displacement relative to the bearing seat. The cover is matched to the bearing seat and the elastic gasket is clapped between the cover and the focusing ring. The lens of the invention has the small size and is easy to operate, so the lens has the good imaging quality.

Description

Varifocus lens device

[technical field]

The present invention relates to a kind of Varifocus lens device, refer in particular to a kind of Varifocus lens device that is applicable in camera mobile phone and the digital camera, not only can carries out the general state shooting but also can carry out the close-perspective recording shooting.

[background technology]

Follow Development of Multimedia Technology, when people pursue lightening, miniaturization to the personal digital consumer goods, also its utility function has been proposed more requirement.With the mobile phone is example, simple call function can not satisfy people's demand already, increasing cell phone manufacturer begins one's study and gathers the novel mobile phone of digital camera camera function, promptly at inner camera lens and the corresponding circuit control system of increasing of mobile phone, thus the function of realization mobile phone photograph.The early stage mobile phone with camera function is installed is tight shot, and its scope that can take especially shooting at close range has certain limitation, can't obtain best shooting effect by focusing, zoom as traditional camera.United States Patent (USP) announces the 6th, 650, promptly discloses a kind of tight shot structure that is applicable to camera cell phone No. 486.

Take the needs of far and near different objects in order to satisfy people to stand in same position, a kind of Varifocus lens device appears in industry, in preset range, change the camera lens focus the position and with different magnification shot objects.Generally speaking, the zoom mode of zoom lens is divided into two kinds of digital zoom and optical zooms.Digital zoom is that the charge-coupled image sensor that utilizes image sensor (promptly take out a zone and amplify, thereby realize by the amplification of photogra in the photo of original shooting by Charge Coupled Device, CCD) local imaging.Optical zoom is to rely on that moving of lens changes lens focus in the camera lens, thereby realizes the amplification of image or dwindle.Digital zoom is to be the zoom of cost to sacrifice resolution and picture quality, and not only can amplify subject by the image that optical zoom obtained, and makes image more clear simultaneously.

Chinese patent is announced No. 2689264 and has been disclosed a kind of Zoom optic lens device, and as shown in Figure 1, it mainly comprises camera lens, accommodates the lens mount 90 of camera lens, screw 91, spring 92 and image sensor 93.This camera lens comprises lens barrel 94, several eyeglasses 95 and top cover 96.The lower end abutment of screw 91 is in camera lens, and the upper end of spring 92 also is resisted against camera lens, by cooperating of screw 91 and spring 92, can make camera lens do straight line in lens mount 90 and move.When object a long way off the time, the imaging point of object just is positioned at image sensor 93 places, and this moment, spring 92 was compressive state; When object on hand the time, desire on image sensor 93, to obtain the sharp image of object, need to adjust the distance between eyeglass 95 and the image sensor 93, make the imaging point of object just be positioned at image sensor 93 places, at this moment, turn screw 91 makes lens barrel 94 do straight line in lens mount 90 under the elastic force effect of spring 92 and moves, thereby is adjusted to the position of picture point.

Above-mentioned Zoom optic lens device, the axial location of its camera lens are realized that by screw 91 and spring 92 because screw 91 is arranged on the position of departing from optical axis, turn screw 91 makes spring 92 unbalance stress everywhere easily, thereby make camera lens produce, and influence image quality; Secondly, spring 92 must leave certain scalable space at the moving direction of camera lens, and causes the axial length of this Zoom optic lens device bigger than normal, and the whole mechanism size of device is difficult to effectively be dwindled; Moreover, being connected between camera lens and the lens mount 90 is to match with the lens mount inwall by the camera lens outer wall, owing to be exact instrument, so cooperate the smoothness on plane to require high to each, and in the actual process, be difficult for processing desirable smooth flat, the stationarity in the time of therefore can influencing lens mount 90 and drive camera lenses and move can influence image quality equally.

In view of the foregoing, be necessary very much to provide a kind of mechanism size little, easy to operate, make camera lens move Varifocus lens device stably, to address the above problem.

[summary of the invention]

The object of the present invention is to provide a kind of mechanism size little, easy to operate, make camera lens move Varifocus lens device stably.

According to above-mentioned purpose of the present invention, the invention provides a kind of Varifocus lens device, it comprise bearing, the rotating focusing ring that is connected to bearing, accommodate mirror cell, the lid that is positioned in the focusing ring and be held in lid and focusing ring between elastic washer.Wherein, bearing comprises a substrate and is located at annular wall on the substrate, substrate upper edge annular wall is evenly distributed with the displacement guide rail that several protrude in substrate surface, and each displacement guide rail comprises that one is higher than the inclined-plane of platform and from the platform even transition to substrate surface of substrate.Focusing ring comprises that hollow columnar body portion and can be for the clicking section of operation, and in addition, the focusing ring bottom also is provided with several slipping parts, corresponds respectively to described several displacement guide rails.Also extended upward one first stop wall on the annular wall of bearing, offer two first grooves on it, and one second stop wall, offer two second grooves on it, corresponding two projections that on the outer wall of focusing ring, are provided with, when this Varifocus lens device is in the normal photographing state, two projections system is accommodated in respectively in one first groove and one second groove, desire to switch to the close-perspective recording state, the operating portion of then operating focusing ring makes the focusing ring rotation, slipping part from the slippage of inclined-plane bottom to platform, drive mirror cell rotation simultaneously and produce axial displacement with respect to bearing, focusing ring can push elastic washer, and two projections slip into another first groove on first stop wall and another second groove on second stop wall respectively, and being positioned at wherein, thereby the continuation campaign of backstop slipping part.

Compared with prior art, the less elastic washer of Varifocus lens device used thickness of the present invention has replaced the bigger spring of thickness, make the mechanism size of Varifocus lens device reduce, and outstanding clicking section is set on focusing ring, made things convenient for the user to operate this Varifocus lens device, moreover, cooperation place between focusing ring and the bearing is homodisperse several slipping parts and displacement guide rail, and symmetrically arranged two projections and first and second groove, such structure can guarantee when focusing ring moves with respect to bearing stressed even, thereby make camera lens steadily flexible, guarantee the quality of image.

[description of drawings]

Fig. 1 is existing Varifocus lens device.

Fig. 2 is the three-dimensional exploded view of Varifocus lens device of the present invention.

Fig. 3 is another three-dimensional exploded view of Varifocus lens device of the present invention.

Fig. 4 is the stereographic map of the bearing of Varifocus lens device of the present invention.

Fig. 5 is the stereographic map after the Varifocus lens device assembling of the present invention.

Fig. 6 is the cross-sectional schematic of Varifocus lens device of the present invention, mainly discloses cooperating of slipping part and displacement guide rail.

Fig. 7 is the varifocal imaging principle schematic of Varifocus lens device of the present invention.

[embodiment]

Varifocus lens device 1 of the present invention is the mobile electronic equipments such as mobile phone that are applied to digital camera or have digital camera lens.Please refer to Fig. 2 and shown in Figure 3, Varifocus lens device 1 of the present invention mainly includes: camera lens (not label), bearing 30, focusing ring 40, elastic washer 50 and lid 60.This camera lens comprises optical mirror slip group of being made up of several optical mirror slips 10 and the mirror cell 20 of accommodating optical mirror slip group 10.This Varifocus lens device 1 comprises that also one is used for the image sensing component 70 of imaging, as charge-coupled image sensor (Charge-Coupled Device, CCD) or complementary metal oxide semiconductor (CMOS) (Complimentary Metal Oxide Semiconductor, CMOS) etc.

Mirror cell 20 comprises the eyeglass resettlement section 22 that an inside is roughly stepped, in order to accommodating several different optical mirror slips of thickness and radius, and a boss 21, its central authorities offer unthreaded hole 24, pass through for light.The outer wall bottom of resettlement section 22 is provided with external thread 23, so that mirror cell 20 screws in the focusing ring 40.

See also shown in Figure 4ly, bearing 30 comprises that a square substrate 31, is vertically installed in the annular wall 33 on the substrate 31, and four reference columns 32 that are fixed on the substrate and are connected by annular wall 33.The bottom of substrate 31 offers accepting groove 38, to accommodate image sensing component 70, the top of substrate 31 offers square through hole 39, through hole 39 is to be connected with accepting groove 38, the light that passes optical mirror slip group 10 can project the light-sensitive surface (not label) of image sensing component 70 and imaging on sensing component by through hole 39.Each reference column 32 top all has a holding section 321, has certain intervals between the supporting surface 322 of itself and reference column 32.In above-mentioned four reference columns 32, it is characterized in that: extended upward one first stop wall 34 on the annular wall 33 between a pair of adjacent reference column 32, another to extend upward on the annular wall between the adjacent reference column 32 33 one with the second relative stop wall 35 of above-mentioned first stop wall 34.These first stop wall, 34 inboards offer two first grooves 341,342, and this corresponding with it second stop wall 35 inboards offer two second grooves 351,352.The upper surface of substrate 31 convexes with three displacement guide rails 36 along annular wall 33 inboard equally spaced, and each displacement guide rail 36 includes the inclined-plane 362 of a platform 361 and from platform 361 even mistakes to substrate 31 upper surfaces.

Focusing ring 40 comprises that the barrel mast shape main part 41 and of a hollow is from the outward extending clicking section 42 of main part.The inwall of main part 41 has internal thread 43, in order to cooperate the external thread 23 of mirror cell 20.Be provided with two projections 44 on the outer wall in relative position, match with first groove 341,342 and second groove 351,352 on the bearing 30 respectively.The bottom surface of main part 40 also has three cylindric slipping parts 45 that are spacedly distributed (seeing shown in Figure 3), matches with three boss 36 on the bearing 30 respectively.

Elastic washer 50 can be one by the made annulus of rubber material, and its outer wall bore is identical with the outer wall bore of the main part 41 of focusing ring 40, and its inwall bore basic near and be slightly larger than the outer wall bore of the resettlement section 22 of mirror cell 20.

Lid 60 is sheet metals of an approximate circle ring-type, and its thickness is identical with the interval between above-mentioned holding section 321 and the supporting surface 322.Lid 60 outside projections have four location divisions 61, all offer pilot hole 62 on each location division 61, are used for matching with the holding section 321 on the bearing 30.The internal diameter of lid 60 is identical with the outer wall bore of resettlement section 22.

See also shown in Fig. 2 to 6, the mirror cell 20 of packing into, 20 below finishes the assembling of camera lens from the mirror cell successively with several optical mirror slips during assembling, then camera lens was bolted in the focusing ring 40 by mirror cell's 20 external threads 23 and cooperating of focusing ring 40 internal threads 43, at this moment, resettlement section 22 parts (part that has external thread 23) of mirror cell 20 are bolted in the focusing ring 40, and partly (part that does not have external thread 23) is exposed to beyond the focusing ring.The combination of mirror cell 20 and focusing ring 40 is pressed into bearing 30, make main part 41 fall in the cylindrical space that annular wall 33 and first stop wall 34, second stop wall 35 defined, and two projections 44 are slipped to its bottom, take in the upper surface of annular wall 33 along first groove 341 and second groove 351 respectively, simultaneously clicking section 42 does not have between two reference columns 32 of

stop wall

34,35 projection and comes out from the centre, so that operation.At this moment, three slipping parts 45 on the focusing ring 40 are the upper surface of contact substrate 31 just all, and 362 bottoms, inclined-plane of doing three displacement guide rails 35, location respectively.Elastic washer 50 is enclosed within outside the mirror cell 20 from top to bottom, because the internal diameter of elastic washer 50 is slightly larger than the outer wall bore of resettlement section 22, and its external diameter is identical with the outer wall bore of main part 41, so elastic washer 50 can be along the resettlement section 22 outer wall fall, until the upper surface of the main part 41 that presses on focusing ring 40, and can not fall in the focusing ring 40 or be enclosed within outside the focusing ring 40.At this moment, the upper surface of elastic washer 50 is concordant with the supporting surface 322 of reference column 32.At last, with four pilot holes 62 of lid 60 aim at respectively four on the reference column 32 holding section 321 and push, lid 60 and bearing 30 are interlocked.At this moment, elastic washer 50 is pressed from both sides every between lid 60 and focusing ring 40.

The lens imaging focus of the Varifocus lens device 1 after the above-mentioned assembling just is positioned at image sensing component 70 surfaces, and the Varifocus lens device 1 under this state is applicable to the shooting of general state.If will take close shot, then need to drive the clicking section 42 of focusing ring 40, make focusing ring 40 along stirring the direction rotation, simultaneously three slipping parts 45 all along inclined-plane 362 slippage obliquely to corresponding platform 361, and projection 44 is followed the rotation of focusing ring 40, taking advantage of a situation is slipped to another in first and second groove 342,352 from this to deviating from first and second groove 341,351, and is positioned at wherein, thus backstop being rotated further of focusing ring 40.Focusing ring 40 has moved a section vertically and has moved (corresponding to bevel altitude) when rotating, elasticity of compression packing ring 50, and drive camera lens move vertically, away from image sensing component 70.After camera lens moved to the second place from initial primary importance vertically, the one-tenth image focus of camera lens was fallen image sensing component 70 surfaces again, and the Varifocus lens device 1 of this moment is applicable to the close-perspective recording shooting.

Please with further reference to Fig. 7 so that the varifocal imaging principle of this Varifocus lens device 1 to be described.Under the situation of imaging surface M (that is image sensing component 70 surfaces) invariant position, when subject was the thing A-B of general distance, camera lens was positioned at L place, position, and light can focus on imaging surface M and form image A '-B ' clearly this moment; And when subject became in-plant thing A1-B1, the position of adjusting camera lens by aforementioned adjusting mechanism moved on the L1 position from L, thereby the light that nearly thing A1-B1 is sent still forms image A1 '-B1 ' clearly in the focusing of imaging surface M place.

By above-mentioned analysis as can be known, the less elastic washer 50 of Varifocus lens device 1 used thickness of the present invention has replaced the bigger spring of thickness, makes the mechanism size of Varifocus lens device reduce; And outstanding clicking section 42 is set on focusing ring, has made things convenient for the user to operate this Varifocus lens device 1; Moreover, cooperation place between focusing ring 40 and the bearing 30 is equally distributed three slipping parts 45 and three displacement guide rails 36, and symmetrically arranged two projections 44 and first and second groove 341,342,351,352, when such structure can guarantee that focusing ring 40 moves with respect to bearing stressed evenly, thereby make camera lens steadily flexible, guarantee image quality.

Claims

1. Varifocus lens device, comprise bearing, the rotating focusing ring that is connected to bearing, accommodate and be positioned in the focusing ring and can follow the focusing ring motion and produce the mirror cell of the axial displacement of relative bearing, and the lid that is interlocked with bearing, it is characterized in that: described bearing comprises substrate and the annular wall of being located on the substrate, and substrate upper edge annular wall is evenly distributed with the displacement guide rail that several protrude in substrate surface, and slipping part can move along displacement guide rail; Described focusing ring comprises barrel mast shape main part and from the outward extending clicking section for operator operation of main part, drive the clicking section can make the mirror cell near or away from image sensing component; Be provided with elastic washer between lid and the focusing ring.

2. Varifocus lens device as claimed in claim 1 is characterized in that: described each displacement guide rail comprises that one is higher than the platform and the inclined-plane from the platform even transition to substrate surface of substrate.

3. Varifocus lens device as claimed in claim 2 is characterized in that: evenly be provided with several described slipping parts on the described focusing ring, the corresponding displacement guide rail of each slipping part.

4. as claim 1 or 3 described Varifocus lens devices, it is characterized in that: described annular wall has extended upward stop wall, offers two grooves on it.

5. Varifocus lens device as claimed in claim 4 is characterized in that: described focusing ring outer wall is provided with projection, be positioned in one of described two grooves, and the operation focusing ring can make this projection slide in another of described two grooves, and be positioned at wherein.

6. as claim 1 or 3 described Varifocus lens devices, it is characterized in that: also be provided with the reference column that several are connected by annular wall on the described substrate.

7. Varifocus lens device as claimed in claim 6, it is characterized in that: offer several pilot holes on the described lid, each reference column top comprises a holding section of matching with described pilot hole, to guarantee that mirror cell and focusing ring can not be along the axis direction voluntary activities.

8. as claim 1 or 3 described Varifocus lens devices, it is characterized in that: offer on the described substrate in order to the accepting groove of accommodating an image sensing component with so that the through hole of the ray cast of passing the mirror cell to this image sensing component.

9. Varifocus lens device as claimed in claim 1 is characterized in that: the main part inwall of described focusing ring is provided with internal thread, and mirror cell's outer wall is provided with external thread, and the mirror cell is bolted in the main part of focusing ring.

10. Varifocus lens device as claimed in claim 1 is characterized in that: equally spacedly on the described bearing be provided with three displacement guide rails that have the inclined-plane.

11. Varifocus lens device as claimed in claim 10 is characterized in that: described focusing ring bottom is equally spaced to be provided with three slipping parts, is positioned an end on described inclined-plane respectively.

12. Varifocus lens device as claimed in claim 11 is characterized in that: described focusing ring comprises that one can be for the clicking section of operation, drives this clicking section and can order about slipping part and move on the platform that the inclined-plane other end connected along the inclined-plane.

13. as claim 1 or 11 described Varifocus lens devices, it is characterized in that: described mirror cell comprises the resettlement section that is used for accommodating optical mirror slip, this resettlement section part is bolted in the focusing ring, and its outer wall bore that exposes the part beyond the focusing ring is slightly less than the internal diameter of elastic washer.

14. a Varifocus lens device includes:

Bearing, it comprises substrate and the annular wall that is vertically installed on the substrate, annular wall inboard, substrate upper edge uniformly-spaced is provided with at least two displacement guide rails, comprises primary importance that is positioned on the substrate and the second place that is higher than primary importance vertically on each displacement guide rail;

Focusing ring is connected to bearing with rotary way, and which is provided with can be for the operating portion of operation and the slipping part that can move back and forth between the primary importance and the second place;

Accommodate and be positioned in the focusing ring mirror cell, and it can rotate under the driving of focusing ring, and produce the axial displacement with respect to substrate; And

Elastic component presses on an end of focusing ring, makes in the focusing ring rotating process when driving operating portion, and this elastic component will produce axial deformation.

15. Varifocus lens device as claimed in claim 14 is characterized in that: described primary importance is connected with an inclined-plane by a platform with the second place.

16. Varifocus lens device as claimed in claim 15 is characterized in that: when driving operating portion, slipping part moves to the second place from primary importance, and elastic component is compressed by focusing ring.

17. Varifocus lens device as claimed in claim 16 is characterized in that: when the reverse drive operating portion, slipping part moves to primary importance from the second place, and elastic component is discharged from compressive state.

18. as claim 14,15 or 17 described Varifocus lens devices, it is characterized in that: the relative position of two on the described annular wall has extended upward first stop wall and second stop wall respectively.

19. Varifocus lens device as claimed in claim 18 is characterized in that: offer two first grooves on described first stop wall, offer two second grooves on second stop wall.

20. Varifocus lens device as claimed in claim 19, it is characterized in that: described focusing ring comprises a hollow columnar body portion, relative position is provided with two projections on its outer wall, when slipping part is positioned at primary importance, two projections are to be accommodated in respectively in a pair of first and second groove, when slipping part moved to the second place, two projections were to be accommodated in another respectively in first and second groove.

21. Varifocus lens device as claimed in claim 20 is characterized in that: described mirror cell comprises that one is used for accommodating the resettlement section of optical mirror slip, and between mirror cell and the focusing ring with the screw thread bolt.

22. Varifocus lens device as claimed in claim 21 is characterized in that: described elastic component is circular, and its internal diameter is slightly larger than or equals the outer wall bore of resettlement section, mirror cell.

23. as claim 14,15 or 17 described Varifocus lens devices, it is characterized in that: described bearing also comprises several reference columns, each reference column top comprises a holding section.

24. Varifocus lens device as claimed in claim 23, it is characterized in that: described Varifocus lens device comprises a lid, described lid is the sheet metal of an approximate circle ring-type, outside projection has the location division corresponding to this reference column around it, offer a pilot hole that matches with the holding section on each location division, can not be with restriction mirror cell and focusing ring along the axis direction voluntary activity.