CN103454748A - Camera lens - Google Patents

Abstract

The invention provides a camera lens applicable to digital cameras, photographic devices and mobile phones, and particularly relates to the camera lens which uses a threaded driving shaft, is used for driving a lens in a threaded transmission mode, can be used for enabling an optical component used for converting the optical property to enter and exit a light path by using a simple mechanism and can achieve the small-sized cheap attached function. The camera lens is provided with a lens group which is composed of one or more lenses, a lens maintaining frame which can maintain the lens group and can move in the optical axis direction, a driving part which can drive the lens maintaining frame to move in the optical axis direction, and a linkage component which is in linkage along with moving of the lens maintaining frame and enables the optical component to enter and exit the light path. The driving part is used for driving the lens maintaining frame to move in the optical axis direction, and accordingly the optical component used for converting the optical property is made to enter and exit the light path.

Description

Lens

Technical field

The present invention relates to the optical goods field, particularly relate to small-sized, low cost, and there is the lens of additional function.

Background technology

In the past, well known had a lens with following additional function,, can change optical characteristics by the light path that makes optical component enter, exit lens that is.For example, can change cutoff filter (the Infra-red Cut Filter that sees through characteristic of lens, IR Cut Filter), polariscope (Polarization Filter), dim light mirror (Neutral Density Filter, ND Filer) the various filters such as, can change photography multiplying power, the focal length of lens, the zoom lens (Conversion Lens) at visual angle, and the bore of lens (aperture) can be changed the lens that the fixed aperture camera lens of adjusting etc. is accompanied with additional function.

These lens comprise that optical component enters by manually making, the type of exit optical and make by electronic that optical component enters, the type of exit optical, the former has the comparatively loaded down with trivial details problem of operation, the latter is because causing with special-purpose driver the maximization of lens, the problem of cost up.

In addition, also proposing has following mechanism,, at the lens peripheral part, has rotating cylinder that is, and the rotating cylinder rotated by the driving force of using driver, or the rotating member thereupon linked, make optical component enter, exit the mechanism of the light path of lens.But, have this problem of the lens that is not suitable for the type that drives lens holding frames in the mode of screw thread transmission along optical axis direction.

Summary of the invention

In view of the above variety of issue point of prior art, the object of the present invention is to provide a kind of small-sized, low-cost and there is the lens of additional function.

This lens has: the lens combination consisted of single or multiple lens, the lens holding frames that keeps the said lens group and can move along optical axis direction, the driver part that drives the said lens holding frame to move along optical axis direction, by entering, exit optical changes the optical component of optical characteristics, the optical component holding frame that keeps above-mentioned optical component, and link so that above-mentioned optical component enters along with the movement of said lens holding frame, the linkage component of exit optical, above-mentioned driver part has threaded drive shaft, the said lens holding frame has the nut portions screwed togather with above-mentioned threaded drive shaft, the action that above-mentioned driver part moves along optical axis direction along with screw drive said lens holding frame and linking, make above-mentioned optical component enter, exit optical, address the above problem thus.

Above-mentioned optical component links along with the outer movement of the common actuating range of said lens holding frame, entering, exit optical.For example when lens combination be during to focus lens, movement outside the focusing range of scioptics holding frame between unlimited far-end-near-end makes that optical component enters, exit optical, when lens combination is zoom lens, the movement outside the zooming range of scioptics holding frame between wide-angle side-telescope end makes that optical component enters, exit optical.Thus, can not be subject to the impact of optical component to the common action of focus lens or zoom lens.

In addition, above-mentioned optical component is along with the said lens holding frame enters to unidirectional movement, exit optical.For example, optical component is along with focus lens is entered to light path to moving of infinity direction, equally along with to focus lens to the movement of infinity direction and exit optical.So, only need control moving range for the increase of infinity direction to the moving range of focus lens.

Above-mentioned optical component holding frame and above-mentioned linkage component have fastener, so that the said lens holding frame can guarantee that above-mentioned optical component enters, exit optical in action usually equally.

Optical component holding frame and linkage component either party, can become one with a side and cam-shaped, the mode that the opposing party and cam path form as one arranges, thereby prevents that number of parts from increasing and preventing the space increase.

The accompanying drawing explanation

Fig. 1 is the front view that shows the structure of implementing each member of wanting required for the present invention.

Fig. 2 is the exploded perspective view of the member of formation of cutoff filter of the present invention unit.

Fig. 3 a be the cutoff filter that shows cutoff filter of the present invention unit while not opening each member state want section's side view.

Fig. 3 b is that the G-G of Fig. 3 a is to cut-open view.

Fig. 3 c is that the D-D of Fig. 3 a is to cut-open view.

Fig. 4 a be the cutoff filter that shows cutoff filter of the present invention unit while opening each member state want section's side view.

Fig. 4 b is that the E-E of Fig. 4 a is to cut-open view.

Fig. 4 c is that the F-F of Fig. 4 a is to cut-open view.

Fig. 5 a be the cutoff filter that shows cutoff filter of the present invention unit will close the time each member state want section's side view.

Fig. 5 b is that the H-H of Fig. 5 a is to cut-open view.

Fig. 5 c is that the I-I of Fig. 5 a is to cut-open view.

Fig. 6 is the motor control sequential chart that shows cutoff filter of the present invention unit.

Embodiment

The present invention is applicable to digital camera, camera head, lens in mobile phone, particularly relate to the employing threaded drive shaft, drive the lens of lens by the screw thread kind of drive, the optical component that the enough simple mechanism controls of energy change optical characteristics enters, exit optical, and the lens of small low-cost attach feature is provided.

Therefore, if by the technical combinations of applying in the present invention and 201210033863.X, utilize the inventive method and the disclosed thermal expansion that utilizes lens chamber in above-mentioned application, shrink the method that changes the lens interval and reduce the back focal length change, for the temperature variation of wider scope, the change of the back focal length of also very effectively drawing up.

As shown in Figure 1, lens 1 is comprised of four major parts: motor 2, focus lens 3, cutoff filter unit 4, mirror head outer shell 5 etc., in addition, this lens 1 also has carriage 6, above-mentioned focus lens 3 is carried on this carriage 6, can be under the driving of motor 2 via carriage 6 along mobile focusing of direction shown in arrow J in Fig. 1 (lens 1 axially).Realize that the major part that the present invention moves is cutoff filter unit 4.

As shown in Figure 2, cutoff filter unit 4 comprises following part: the first spring 11 of the optical filter support 10 of the first bar 8 of the optical filter pedestal 7 of plastic material, plastic material, the second bar 9 of plastic material, plastic material, metal material, the second spring 12, discoid component 13, as the cutoff filter 14 of optical component.Wherein, in the present embodiment, above each member has adopted above-described material, but certainly, in the situation that guarantee to reach corresponding function, the material of above each member can suitably change.

Cutoff filter unit 4 assembles in the following way.14 glue of cutoff filter are fixed on optical filter support 10, then respectively optical filter support 10, cutoff filter 14, the first bar 8, the second bar 9 are assembled on the upper and lower fulcrum and side fulcrum 7a in optical filter pedestal 7 fronts, then respectively the first spring 11, the second spring 12 are assembled on the first bar 8, the second bar 9, finally discoid component 13 are assembled on optical filter pedestal 7.

As shown in Fig. 2～Fig. 5 c, the second bar 9 has hole 9a, abutting part 9b, cam pin 9c, side fulcrum 7a on this hole 9a and optical filter pedestal 7 chimeric and can with this side fulcrum 7a one with respect to optical filter pedestal 7 rotation freely, this cam pin 9c inserts in this cam hole 8b in the mode that can move in the cam hole 8b of the first bar 8.

Be inserted with fulcrum 7b under the front on optical filter pedestal 7 in the hole 8a of the first bar 8, and under this front, fulcrum 7b can be with respect to this hole 8a rotation freely, and the cam pin 8c on the first bar 8 inserts in this cam path 10c in the mode that can move in the cam path 10c of optical filter support 10.

In addition, the second spring 12 along direction shown in arrow A to first bar 8 application of forces, simultaneously, the leaf spring 13a of discoid component 13 along direction shown in arrow B to first bar 8 application of forces.Wherein, have gap 8aa in the 8a of hole, thus, positive lower fulcrum 7b can be with respect to this hole 8a along the displacement of direction shown in arrow B.

Be inserted with fulcrum 7c on the front on optical filter pedestal 7 in the hole 10a of optical filter support 10, and on this front, fulcrum 7c can be with respect to this hole 10a rotation freely.Maintaining part 10b on optical filter support 10 is kept cutoff filter 14.In addition, the first spring 11 along direction shown in arrow C to optical filter support 10 application of forces.

Next with regard to practical work process of the present invention, describe.

At first, the action that covers the exit status that getting the hang of of peristome 5a do not cover peristome 5a from cutoff filter 14 is described.

As shown in Fig. 3 a～Fig. 4 c, utilize the power of motor 2, offer the carriage 6 that carries focus lens 3 and be greater than other resistant power with one, focus lens 3 moves towards the direction of cutoff filter unit 4, the abutting part 9b of carriage 6 pushing the second bars 9, the second bar 9 turns 9.992 degree around the side fulcrum 7a on optical filter pedestal 7, then, rotate and pass to again the first bar 8, the first bar 8 correspondingly overcome the second spring 12 elastic force and towards the direction with opposite direction shown in arrow A around the front on optical filter pedestal 7 under fulcrum 7b rotation 12 degree, under the transfer function of power, in the cam path 10c of cam pin 8c on the first bar 8 on optical filter support 10, move, and then drive optical filter support 10 overcome the first spring 11 elastic force and around fulcrum 7c on the front of optical filter pedestal 7 towards the direction rotation with opposite direction shown in arrow C, thereby become exit status.

Now, after cam pin 8c rotatablely moves to and drives optical filter support 10 rotation 51.337 degree, this cam pin 8c moves to the state with 10cf section butt from the state of the 10cd section butt with cam path 10c under the effect of the elastic force of the leaf spring 13a of discoid component 13.Under this state, when focus lens 3 when the direction contrary with cutoff filter unit 4 moves, under the elastic force effect of the first spring 11, optical filter support 10 is towards direction rotation shown in arrow C, under the elastic force effect of the second spring 12, the fastener 10ce butt of the cam pin 8c of the first bar 8 and cam path 10c, the oriented strength pressed down of leaf spring 13a of discoid component 13 works simultaneously, the first bar 8 can not be moved up, the strong equilibrium state that reaches now, thus cutoff filter 14 is remained on to exit status.

Next, the exit status that does not cover peristome 5a from cutoff filter 14 is described to the action got the hang of that covers peristome 5a.

As shown in Figure 5, utilize the power of motor 2, offer the carriage 6 that carries focus lens 3 and be greater than other resistant power with one, focus lens 3 moves towards the direction of cutoff filter unit 4, the abutting part 9b of carriage 6 pushing the second bars 9, the second bar 9 turns 6.693 degree again around the side fulcrum 7a on optical filter pedestal 7, then, rotate and pass to again the first bar 8, the first bar 8 correspondingly overcome the second spring 12 elastic force and towards the direction with opposite direction shown in arrow A around the front on optical filter pedestal 7 under fulcrum 7b rotate again 9 degree, under the transfer function of power, cam pin 8c on the first bar 8 by with optical filter support 10 on cam path 10c in the state of 10ca section butt become and be connected with in the state of the 10cb of 10ca section section butt, now, cam pin 8c overcomes the elastic force of leaf spring 13a and climbs up the inclined-plane 10cg in cam path 10c, to 10ch section, continue mobile, after moving to 10ch section, motor 2 playback, power no longer is provided.Because cam pin 8c leaves 10cb section, so make optical filter support 10 towards direction rotation shown in arrow C under the elastic force effect of the first spring 11, the 10cc section of cam path 10c becomes the state with cam pin 8c butt, under this state, when focus lens 3 when the direction contrary with cutoff filter unit 4 moves, under the elastic force effect of the second spring 12, the first bar 8 is towards direction rotation shown in arrow A, under the elastic force effect of the first spring 11, optical filter support 10 is further towards direction rotation shown in arrow C.Thus, cam pin 8c becomes and is connected with in the state of the 10ca of 10cc section section butt from the state of the 10cc section butt with cam path 10c, now, under the elastic force effect of leaf spring 13a, cam pin 8c moves to the state with 10cd section butt by the state of the 10ch section butt with cam path 10c.Thus, cutoff filter 14 being become gets the hang of.

The above record about each member rotation number of degrees is only the introduction for the number of degrees that adopt in present embodiment, as those skilled in the art, the different number of degrees can be set according to the difference of practical structures, as long as can with the application in similarly make cutoff filter become exit status, get the hang of, and be not limited to the above-described concrete number of degrees.

Next the action of motor 2 described.

As shown in Figure 6, the motor step number of cutoff filter of the present invention unit 4 is controlled: while take the focal position of lens head when wide-angle state infinity, be 0 step, when motor moves 188 step backward, cutoff filter 14 is realized opening, motor continues operation backward, and when running to 288 step, cutoff filter 14 is realized closing.

In sum, the present invention only need adopt mechanical mechanism can realize the mutual switching of the opening and closing of cutoff filter 14 on the basis in existing part and space, so just can not cause the maximization of camera lens, and can not cause cost significantly to rise because increasing the parts such as motor.Thus, can reach in the luminance brightness of varying environment and all can effectively, obtain well the effect of more perfect imaging.

Claims (7)

1. a lens, it is characterized in that: have: the lens combination formed by single or multiple lens, the lens holding frames that keeps the said lens group and can move along optical axis direction, the driver part that drives the said lens holding frame to move along optical axis direction, by entering, exit optical changes the optical component of optical characteristics, the optical component holding frame that keeps above-mentioned optical component, and link so that above-mentioned optical component enters along with the movement of said lens holding frame, the linkage component of exit optical, above-mentioned driver part has threaded drive shaft, the said lens holding frame has the nut portions screwed togather with above-mentioned threaded drive shaft, the action that above-mentioned driver part moves along optical axis direction along with screw drive said lens holding frame and linking, make above-mentioned optical component enter, exit optical.

2. lens according to claim 1 is characterized in that: above-mentioned optical component links along with the outer movement of the common actuating range of said lens holding frame, entering, exit optical.

3. lens according to claim 2, it is characterized in that: above-mentioned optical component holding frame and above-mentioned linkage component have fastener, so that the said lens holding frame can guarantee that in above-mentioned common action above-mentioned optical component enters, exit optical equally.

4. according to the described lens of claim 2 or 3, it is characterized in that: the above-mentioned common action of said lens holding frame is focus operation.

5. according to the described lens of claim 2 or 3, it is characterized in that: the above-mentioned common action of said lens holding frame is the zoom action.

6. according to the described lens of any one in claim 1～5, it is characterized in that: above-mentioned optical component is along with the said lens holding frame enters to unidirectional movement, exit optical.

7. according to the described lens of any one in claim 1～6, it is characterized in that: either party of above-mentioned optical component holding frame and above-mentioned linkage component, can become one with a side and cam-shaped, the mode that the opposing party and cam path form as one arranges.

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