CN104898348A - Lens unit and camera - Google Patents
Lens unit and camera Download PDFInfo
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- CN104898348A CN104898348A CN201510102356.0A CN201510102356A CN104898348A CN 104898348 A CN104898348 A CN 104898348A CN 201510102356 A CN201510102356 A CN 201510102356A CN 104898348 A CN104898348 A CN 104898348A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
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Abstract
The invention provides a lens unit and a camera, which can further inhibit the magnetic influence of the light limitation unit containing a shutter on the magnetic sensor of the shaking correction unit. When an observer observes along the optical axis (OA), a Y direction detection Hall member (magnetic sensor 52) is configured in the area (AR1) passing through along the extending of the reference line (L1) and along the rotation of the magnet (67) from the center of the rotation magnet (67) to inhibit the influence of the Hall member (magnetic sensor 52) detection in the Y direction of the shaking correction unit which is brought by the first promoter (71) of the light inhibition unit (40), and high performance position detection is made. Besides, the promoter (71) and the Y direction detection Hall member (magnet sensor 52) are configured nearby, which enables miniaturization of the lens unit (100) and the camera having the same.
Description
Technical field
The present invention relates to a kind of have can shading shutter etc. and there is the lens unit of the mechanism correcting picture shake optically and there is its camera head.
Background technology
In the past, the known picture shake correction unit with following structure: cause picture to be shaken to prevent from easily producing dynamic grade of hand shaking when hand-held shooting, use the shaking detection device of Magnetic Sensor to carry out the shake situation of detection camera, make accordingly to move along direction displacement orthogonal with the optical axis as jitter correction lens or imaging apparatus with its testing result.In the camera with such picture shake correction unit, because of the restriction in miniaturization or Optical System Design, near shake correction unit, be configured with the shutter unit of having carried shutter or aperture.Under these circumstances, drive when shutter or aperture, from the magnetic of actuator generation, impact is brought on Magnetic Sensor, there is the problem can not carrying out jitter correction accurately.For such problem, as prior art, disclose the structure (with reference to patent documentation 1) that regulation drives shutter or the actuator of aperture and the configuration of Magnetic Sensor.
But, even if when implementing the countermeasure shown in prior art,, there is the position detection of magnetic to shake correction unit produced from actuator and bring dysgenic problem and the problem because damaging design freedom to the restriction of the distance of shutter unit from Magnetic Sensor in the configuration of the actuator according to shutter unit side and the Magnetic Sensor as shake correction unit side.This is because the magnetic produced from actuator has directive property, and no matter the need of the magnetic influence considering independently to produce respectively from the coil and rotary magnet that form actuator, all do not study fully.
Patent documentation 1: Japanese Unexamined Patent Publication 2008-216877 publication
Summary of the invention
The present invention researches and develops in view of the aforementioned technical background, its object is to, provide a kind of Magnetic Sensor of magnetic influence on shake correction unit of the light limiting unit such as carrying out self-contained shutter unit that can suppress further bring the lens unit of impact and have its camera head.
To achieve these goals, the first lens unit of the present invention has: jitter correction portion (shake correction unit), the correction of picture shake when it is made a video recording, light limiting unit (light limiting unit), at least partially, described jitter correction portion has the light of its restriction incidence: movable frame, and it keeps correction lens and imaging apparatus either party, fixed frame, it supports movable frame, drive division, it drives movable frame and makes it relative to fixed frame displacement, Magnetic Sensor, it detects the position of movable frame, and light limiting unit has: at least one party in shutter and aperture, actuator, it has driven for opening and closing coil and rotary magnet, and drive shutter or aperture, the winding center line of this driven for opening and closing coil is configured in the direction substantially vertical with the Magnetic testi direction of Magnetic Sensor by driven for opening and closing coil, rotate centered by the axle almost parallel with the optical axis of optical system by making rotary magnet, shutter or aperture can be made to become open mode and closed condition, when observing from the direction along optical axis, through rotary magnet center and represent the datum line accompanying rotation magnet of the magnetic direction of rotary magnet rotation and in the region passed through, configure described Magnetic Sensor.
According to said lens unit, when observing from the direction along optical axis, through rotary magnet center and represent the datum line accompanying rotation magnet of the magnetic direction of rotary magnet rotation and in the region passed through, namely, in the region of the directive property of the magnetic produced from rotary magnet weak (variable quantity is little), configuration Magnetic Sensor, therefore, it is possible to the magnetic influence suppressing the Magnetic Sensor of actuator to jitter correction portion of light limiting unit to bring, can carry out the detection of high performance position.In addition, can by actuator and magnetic sensor configuration nearby, and lens unit can be made and there is its camera head miniaturization.
According to concrete mode of the present invention, in above-mentioned first lens unit, the anglec of rotation of rotary magnet is less than ± 30 °.
According to another way of the present invention, when observing from the direction along optical axis, relative in the transversal vertical with winding center line following scope at 45 °, configuring Magnetic Sensor through the winding center of driven for opening and closing coil.
As the occurring source of magnetic Magnetic Sensor being brought to impact, not only consider the rotary magnet forming actuator, also consider the impact from coil, because the magnetic of rotary magnet and driven for opening and closing coil exists directive property respectively, so not only consider the position relationship between rotary magnet, the position relationship of driven for opening and closing coil and Magnetic Sensor also adopts said structure, thus can suppress the magnetic influence that brings Magnetic Sensor further, can carry out the detection of high performance position.In addition, when observing from the direction along optical axis, more preferably relative to through the winding center of driven for opening and closing coil and configure Magnetic Sensor in the scope of less than 30 ° of the transversal vertical with winding center line.
According to another way of the present invention, from along optical axis direction observe time, through driven for opening and closing coil winding center and the transversal vertical with winding center line configures Magnetic Sensor.In this case, the scope that magnetic influence is large can be reduced, the configuration degree of freedom of actuator and Magnetic Sensor can be improved.
According to another way of the present invention, due to the magnetic influence brought Magnetic Sensor can be reduced, so when the distance about the direction along optical axis between the winding center and the center of Magnetic Sensor of driven for opening and closing coil is 3 ~ 15mm, even easily produce the position relationship of magnetic influence to Magnetic Sensor, also the detection of high performance position can be carried out.In addition, above-mentioned distance is more preferably 5 ~ 10mm.
To achieve these goals, the second lens unit of the present invention has: jitter correction portion, the correction of picture shake when it carries out, light limiting unit, at least partially, jitter correction portion has the light of its restriction incidence: movable frame, and it keeps correction lens and imaging apparatus either party, fixed frame, it supports movable frame, drive division, it drives movable frame and makes it relative to fixed frame displacement, Magnetic Sensor, it detects the position of movable frame, detected magnet, it is fixed on movable frame, and light limiting unit has: at least one party in shutter and aperture, actuator, it has driven for opening and closing coil and rotary magnet, and drive shutter or aperture, the winding center line of this driven for opening and closing coil is configured in the direction substantially vertical with the Magnetic testi direction of Magnetic Sensor and configures by driven for opening and closing coil, rotate centered by the axle almost parallel with the optical axis of optical system by making rotary magnet, shutter or aperture can be made to become open mode and closed condition, the flux change amount of the Z-direction parallel with optical axis on the Magnetic Sensor magnetic influence produced from actuator caused is set to A, the flux change amount of the Z-direction of the unit amount of movement on the Magnetic Sensor produced by detected magnet and Magnetic Sensor relative displacement is set to B, when the amount of movement of the picture in imaging surface is set to D relative to the ratio of the amount of movement of movable frame, value A/B × D is equivalent to 5 pixels (portrait quite) of imaging apparatus below.
According to said lens unit, because above-mentioned value A/B × D is equivalent to below 5 pixels of imaging apparatus, so the Magnetic Sensor of the actuator of light limiting unit on jitter correction portion can be suppressed to bring impact and apply undesirable displacement to movable frame, the detection of high performance position can be carried out.In addition, the camera head miniaturization with lens unit can be made by actuator and magnetic sensor configuration nearby.Preferably, value A/B × D is equivalent to below 3 pixels, it is further preferred that be equivalent to below 1 pixel.
According to another way of the present invention, in the above-mentioned first or second lens unit, light limiting unit at least comprises described shutter, and described actuator drives described shutter opening and closing.In this case, light limiting unit at least works as shutter unit, can prevent the Magnetic Sensor of actuator on jitter correction portion when shutter drives from bringing impact and the correction accuracy of picture shake is reduced.
Here, compared with the magnetic influence that the magnetic influence produced from the actuator of shutter and the actuator from aperture produce, on photography result that is image be taken into and directly bring the possibility of impact high.This is because the driving of aperture is not carried out in the moment being obtained photographs by imaging apparatus.On the other hand, the driving of shutter carries out in the moment being obtained photographs by imaging apparatus, therefore directly brings the possibility of impact high on photographs.Therefore, from this viewpoint, particularly, relative to the configuration of the actuator of shutter, Hall element (Magnetic Sensor) is set to that the structure being difficult to produce magnetic influence is very important, preferably with Hall element relative to the actuator of aperture configuration relation compared with, more pay the utmost attention to the configuration of Hall element relative to the actuator of shutter.
To achieve these goals, camera head of the present invention has said lens unit.Camera head of the present invention realizes miniaturization while can carrying out the correction of high-precision shake.
Accompanying drawing explanation
Fig. 1 is the stereographic map of the camera main-body of embodiment.
Fig. 2 is the stereographic map of the lens unit of embodiment.
Fig. 3 is the stereographic map in the inner movable portion represented the state of taking out from the lens barrel of lens unit.
Fig. 4 is the exploded perspective view in inner movable portion.
Fig. 5 is the figure observing the inside of pulling down upper ledge and flexible printed board from inner movable portion from image side.
Fig. 6 is the figure of the configuration for illustration of the actuator in shutter unit, blade etc.
Fig. 7 is the cut-open view that the structure in inner movable portion 200 and the configuration relation of inscape are conceptually described.
Fig. 8 A is the front view of the first actuator being arranged on shutter unit, and Fig. 8 B is the stereographic map of the first actuator.
Fig. 9 A ~ 9C is the figure of the configuration relation of Magnetic Sensor for illustration of the first actuator and jitter correction.
Figure 10 A is the contour map of experimental result of the magnetic influence produced from rotary magnet, and Figure 10 B is the contour map of the experimental result of the magnetic influence produced from the driven for opening and closing coil of shutter.
Embodiment
Hereinafter, with reference to the accompanying drawings of the lens unit of one embodiment of the present invention.
As shown in Figures 1 and 2, lens unit 100 has optical system OS, inner movable portion 200 etc. in lens barrel 10.Be installed on the imaging surface imaging of imaging apparatus 300 (illustrating with the state of local removing in fig. 2) of rectangular aperture 20 by the light from subject of optical system OS, and convert electric signal to.In addition, optical system OS is such as zoom lens, is provided with the not shown cam mechanism of the multiple lens movement independently making formation optical system OS at lens barrel 10.
As shown in Figure 1, lens unit 100 is assembled on camera main-body 901, thus forms camera head 1000 as a whole.Although omit detailed description to camera main-body 901, camera main-body 901 is provided with the circuit 905 of inner movable portion 200 for making lens barrel 10 subsidiary, imaging apparatus 300 action.In addition, in the imaging surface of imaging apparatus 300, have as pixel arrangement and be arranged in parallel the sensor element on two-dimensional mesh lattice point with XY face.
As shown in Figures 3 and 4, inner movable portion 200 has shake correction unit 30 and light limiting unit 40, makes carry out stacked under these unit 30,40 state close along optical axis OA direction and be fixed by screw BT.The former shake correction unit (jitter correction portion) 30 supports the more than one correction lens LS forming optical system OS.Shake correction unit 30 makes the movable frame 133 of maintenance correction lens LS along the X-direction orthogonal relative to the Z-direction parallel with optical axis OA and/or Y-direction displacement, thus corrects picture shake optically.The light limiting unit (light limiting unit) 40 of the latter is built-in with blade described later, aperture blades etc., and by carrying out their opening and closing with the desired moment, light adjustment or the photoresistance that can implement the opening and closing, dim light etc. comprising shutter stop.The circuit 905 that shake correction unit 30, light limiting unit 40 are arranged on the camera main-body 901 of Fig. 1 controls and action.
Shake correction unit (jitter correction portion) 30 is combination pedestal 131, the coil portion 132 driven, the movable frame 133 of correction lens LS, upper ledge 134 and the movable support parts 135 allowing the smooth and easy displacement of movable frame 133.Pedestal 131 in them and upper ledge 134 are worked as the fixed frame of supporting movable frame 133 by their cooperation.The pedestal 131 forming a side of fixed frame is in downside and object side, has the opening 30a that correction lens LS is exposed, and has the structure keeping light limiting unit 40 at object side.The flexible printed board 32f that coil portion 132 has X-direction drive coil 32a, Y-direction drive coil 32b and powers to these two drive coils 32a, 32b.Correction lens LS remains in opening 30c as holding frame by movable frame 133, with correction with together with lens LS at XY in-plane displacement.Now, apply in X direction or the power of Y-direction displacement from coil portion 132 pairs of movable frames 133, and allow the slip parallel with XY face to move by movable support parts 135.Movable support parts 135 are folded between pedestal 131 and movable frame 133 and allow movable frame 133 displacement, and are made up of three ball 35a and three the spring members 35b as rolling member.At movable frame 133 from when making the optical axis of the correction lens LS home position consistent with the optical axis OA of optical system OS depart from, movable support parts 135 apply to make it return to the power of home position.The upper ledge 134 forming the opposing party of fixed frame has the opening 30b that correction lens LS is exposed, and clips movable frame 133 ground and is fixed on pedestal 131 by screw BT and becomes to be integrated with it.In addition, the erection opening that the X-direction lower surface of upper ledge 134 and object side being provided with the movement of the X-direction of the detection movable frame 133 relatively arranged with detected magnet 33a, 33b of being installed in movable frame 133 detects Hall element 51 and the Y-direction of movement of Y-direction detecting movable frame 133 detect the erection opening of Hall element 52.The Hall element 51,52 being installed in upper ledge 134 is Magnetic Sensors, and the signal from two Hall elements 51,52 is sent to outside camera main-body 901 side via flexible printed board 32f.
Fig. 5 is under the state pulling down upper ledge 134 and flexible printed board 32f, the front view of the shake correction unit 30 observed along optical axis OA towards object side.Fig. 6 is the conceptual top view for illustration of the inner space except the light limiting unit 40 under the state of decapsidate 141.Fig. 7 is the YZ cut-open view that the structure in inner movable portion 200, the configuration relation of inscape are conceptually described.In addition, two Hall elements (Magnetic Sensor) 51,52 are fixed on upper ledge 134, but conveniently also illustrate in Fig. 5 and Fig. 6.
In shake correction unit 30 Fig. 4, Fig. 5 etc. Suo Shi, on pedestal 131, with opening 30a, being adjacent to, X-direction drive coil 32a and Y-direction drive coil 32b, X-direction drive coil 32a and Y-direction drive coil 32b are set and making major axis or axis vertical take-off.In addition, the two piece pin PNs outstanding from pedestal 131 to side engage with not shown cam path when being loaded into camera, and related pedestal 131 drives movable frame 133 along optical axis OA direction together.Pedestal 131 has three ball bearing portion 31a, and described three ball bearing portion 31a possess the recess that bottom surface is the cylindrical shape of plane.These three ball bearing portion 31a are configured in around opening 30a in the mode of roughly trisection (120 ° of phase places).On the other hand, the back side (face relative with pedestal 131) of relative with these ball bearing portions 31a movable frame 133 is plane.At pedestal 131, be adjacent in order to an end of mounting spring parts 35b with three each ball bearing portion 31a and be provided with three installation portion 31d.These three installation portion 31d are roughly trisection ground configuration also.On the other hand, relative with pedestal 131 movable frame 133 has three the raised 34ts outstanding radially to its periphery.These three projection 34t are relative with three the installation portion 31d being arranged on pedestal 131 and roughly configure to trisection (120 ° of phase places).
Three ball 35a are configured at the ball bearing portion 31a of pedestal 131, by movable frame 133 is positioned on pedestal 131, these balls 35a is clipped between the back side of ball bearing portion 31a and movable frame 133, by the rolling of ball 35a, movable frame 133 can be made to move swimmingly relative to pedestal 131.In addition, each installation portion 31d of pedestal 131 links with the holding section of the end being arranged on each spring members 35b, and each projection 34t of movable frame 133 links with the holding section of the other end being arranged on each spring members 35b.Spring members 35b applies to pedestal 131 and movable frame 133 acting force clipping the direction (approximating direction) of ball 35a, thus to make the adeciduate mode of ball 35a play a role, and there is function movable frame 133 being centered at normal condition relative to pedestal 131.Here, normal condition refers to, the state that the optical axis of such as correction lens LS is consistent with the optical axis OA of optical system OS.That is, when movable frame 133 departs from from normal condition, spring members 35b applies the acting force that movable frame 133 is restored to normal condition.On the other hand, when movable frame 133 is in normal condition, each spring members 35b only applies acting force to Z-direction to pedestal 131 and movable frame 133.
Two detected magnet 33a, 33b being arranged on movable frame 133 have the profile of rectangular plate-like, adjacent with opening 30c and configure with the state making polarity orthogonal in two positions separating 90 °.Under said reference state, the center of the X-direction drive coil 32a on the center of detected magnet 33a that X-direction drives and pedestal 131 overlaps when observing from Z-direction, and to detect the center of Hall element 51 consistent with X-direction.Similarly, under normal condition, the center of the Y-direction drive coil 32b on the center of detected magnet 33b that Y-direction drives and pedestal 131 overlaps when observing from Z-direction, and to detect the center of Hall element 52 consistent with Y-direction.Two Hall elements 51,52 have sensitivity in the Z-direction (being optical axis direction in the present embodiment) parallel with optical axis OA.Such as, when the detected magnet 33a of X-axis is from normal condition to ± X-direction displacement, the magnetic flux component being detected the Z-direction of Hall element 51 by X-direction is changed significantly with zero friendship type (ゼ ロ Network ロ ス type), can go out the displacement of pedestal 131 with high-sensitivity detection.Similarly, when the detected magnet 33b of Y-axis is from normal condition to ± Y-direction displacement, the magnetic flux component being detected the Z-direction of Hall element 52 by Y-direction is changed significantly with zero friendship type, can with the displacement of high-sensitivity detection pedestal 131.In addition, as the actuator of X-direction, the detected magnet 33a driven by X-direction and X-direction drive coil 32a forms X-direction drive division (voice coil motor) VM1, as the actuator of Y-direction, the detected magnet 33b driven by Y-direction and Y-direction drive coil 32b forms Y-direction drive division (voice coil motor) VM2.
When being described the work of shake correction unit 30, by the signal from not shown acceleration transducer, power to X-direction drive coil 32a and/or Y-direction drive coil 32b from outside via flexible printed board 32f, thus utilize the magnetic force produced according to Fleming's left-hand rule, produce the thrust in the direction (X-direction and/or Y-direction) orthogonal with optical axis OA, thus movable frame 133 is moved along optical axis orthogonal directions together with correction lens LS, carry out picture jitter correction thus.Now, X-direction detects the amount of movement that Hall element 51 detects the X-direction of movable frame 133, and Y-direction detects the amount of movement that Hall element 52 detects the Y-direction of movable frame 133, thus the picture jitter correction that can carry out precision good controls.
In light limiting unit (light limiting unit) 40 shown in Fig. 6 etc., be built-in with blade 61 and aperture blades 62.Blade 61 is supported by the first turning axle 63 and can at XY rotation in surface, and aperture blades 62 is supported by the second turning axle 64 and can at XY rotation in surface.Be accompanied with the first actuator 71 for carrying out driven for opening and closing to it at blade 61, be accompanied with the second actuator 72 for carrying out driven for opening and closing to it at aperture blades 62.Sometimes blade 61 is called shutter, aperture blades 62 is called aperture.
The front end of blade 61 has light shielding part 61a.Blade 61 is configured to switch to the off-position of closing openings 40a under the state of counterclockwise maximum rotation and under the state of clockwise maximum rotation, opens the open position of opening 40a.When blade 61 is in the closed position, light path is cut off by the light shielding part 61a of closing openings 40a, light can not incide the later after-stage lens of correction lens LS, when blade 61 is in an open position, light shielding part 61a moves to the surrounding of opening 40a and opens light path, and light incides the later after-stage lens of correction lens LS.
Aperture blades 62 has the aperture section 62a being provided with little opening 62s in front end, but also can using overall for aperture section 62a as dim light filter.Aperture blades 62 is configured to switch to the operating position overlapped with opening 40a under the state of counterclockwise maximum rotation and the retreating position opening opening 40a under the state of clockwise maximum rotation.Operating position is in (conveniently at aperture blades 62, also referred to as off-position or closed condition) time, by the aperture section 62a partial cutoff light path of closing openings 40a, or carry out dim light, make the light quantity inciding the later after-stage lens of correction lens LS with ratio minimizing to greatest extent, retreating position is in (conveniently at aperture blades 62, also referred to as open position or open mode) time, light path is opened, and the light quantity that light incides the later after-stage lens of correction lens LS can be made to reach to greatest extent.
Drive the first actuator 71 of blade 61 also as shown in Fig. 8 A and 8B, there is excitation division 66 and rotary magnet 67.Excitation division 66 to be fixed in shell 141 and to apply driving force to rotary magnet 67, and has the driven for opening and closing coil 66b of the coil as yoke parts 66a and shutter.Rotary magnet 67 can be supported by the first turning axle 63 shared with blade 61 rotatably, but rotates independently relative to blade 61.But, if form the magnetic field of regulation relative to rotary magnet 67, yoke parts 66a in the first actuator 71 just not necessarily.
In excitation division 66, yoke parts 66a is the U-shaped portion part formed by metal group material, has a pair axle core components 66d, 66e relatively extending.Around the axle core components 66d being configured in outside, be wound with driven for opening and closing coil and driven for opening and closing coil 66b.Driven for opening and closing coil 66b is the solenoid of the coiling be made up of electric conductor being wound with a lot of circle, when never illustrated flexible printed board supply electric power, produces the magnetic field in the center line that is direction of the length direction of axle core components 66d along coiling.The magnetic force that driven for opening and closing coil 66b produces by yoke parts 66a is induced to another axle core components 66e from an axle core components 66d, such as, when the leading section 6a of an axle core components 66d produces N pole, produces S pole at the leading section 6b of another axle core components 66e.
Rotary magnet 67 is magnetized in the mode that NS polarity is different in its circumferential direction.The rotary actuation bar 68a be made up of nonmagnetic material is integrally bonded at rotary magnet 67.In the position of rotation center leaving rotary actuation bar 68a, be provided with engaging protrusion 68c highlightedly to+Z-direction, this engaging protrusion 68c engages with the bar connecting hole 61j being arranged on blade 61.When the energising direction be energized to driven for opening and closing coil 66b changes, the leading section 6a of an axle core components 66d exchanges with the NS polarity of the leading section 6b of another axle core components 66e, by the attraction between a pair axle core components 66d, 66e and rotary magnet 67 and repulsive interaction, rotary actuation bar 68a rotates together with rotary magnet 67.By the rotation of this rotary actuation bar 68a, drive blade 61, carry out the on-off action of shutter.In addition, in this first actuator 71, when not carrying out the energising to driven for opening and closing coil 66b, by the attraction effect of yoke parts 66a and rotary magnet 67, the position of rotary actuation bar 68a is kept.
Second actuator 72 of the driving aperture blades shown in Fig. 5 and Fig. 7 has the structure identical with the first actuator 71 of present embodiment, although marked the Reference numeral different from each parts of the first actuator 71, omits the description.In addition, the second actuator 72 has the excitation division 166 corresponding with the excitation division 66 of the first actuator 71 and rotary magnet 67 and rotary magnet 167, and excitation division 66 has the driven for opening and closing coil 166b of the coil as aperture.
As shown in Fig. 5 ~ Fig. 8, the first actuator 71 of light limiting unit 40 detects Hall element 52 relative to the Y-direction of shake correction unit 30 and closer configures and easily produce magnetic interference.Equally, the second actuator 72 detects Hall element 51 relative to X-direction and closer configures also easily generation magnetic interference.The distance along optical axis OA direction formed between the winding center C2 (Fig. 7) of the driven for opening and closing coil 66b of the first actuator 71 and center C4 (Fig. 7) of Hall element (Magnetic Sensor) 51,52 is in the scope of 3 ~ 15mm.Be more than 3mm by making the distance between center C2, C4 along optical axis OA, easily avoid light limiting unit 40 and shake correction unit 30 cross-over configuration, the degree of freedom of configuration can be improved, by being below 15mm, light limiting unit 40 is separated with shake correction unit 30, and inner movable portion 200 can be avoided to maximize, consequently, lens unit 100 miniaturization can be made.That is, light limiting unit 40 and shake correction unit 30 need closely to configure with certain degree, but need to avoid magnetic to interfere as described above.In addition, above-mentioned distance is more preferably 5 ~ 10mm.Below, mainly the configuration relation of the first actuator 71 of light limiting unit 40 and the Y-direction detection Hall element 52 of shake correction unit 30 is described.In addition, detect for the configuration relation of Hall element 51, owing to adopting identical consideration mode, so omit the description to simplify for the second actuator 72 of light limiting unit 40 and the X-direction of shake correction unit 30.
As shown in Fig. 9 A and 9B, when observing first actuator 71 along optical axis OA direction, the Y-direction of shake correction unit 30 detects Hall element 52 and is configured near the rotary magnet 67 of the first actuator 71.In addition, the center of rotary magnet 67 and the center configuration of driven for opening and closing coil 66b are about roughly the same position, optical axis OA direction, but Y-direction detects Hall element 52 is configured in about optical axis OA direction with rotary magnet 67 and driven for opening and closing coil 66b in the scope of 3 ~ 15mm (reference Fig. 7).Y-direction detect Hall element (Magnetic Sensor) 52 preferably from either party of rotary magnet 67 and driven for opening and closing coil 66b not by magnetic influence.
First, the configuration condition that Y-direction detection Hall element (Magnetic Sensor) 52 is difficult to be subject to from the rotary magnet 67 of the first actuator 71 magnetic influence is described.For rotary magnet 67, need to consider to make blade 61 opening and closing rotate, because of this spinning movement, magnetic changes.
When observing from the direction along optical axis OA, to through the center C1 of rotary magnet 67 and the spinning movement of the datum line L1 accompanying rotation magnet 67 extended along the magnetic direction (N and S) of the rotary magnet 67 and region AR1 that passes through considers.A pair sector region that such region AR1 makes top dock by clipping center C1 is formed, and the anglec of rotation of this fan-shaped central angle alpha and rotary magnet 67 is that the situation of less than about ± 30 ° becomes less than 60 ° accordingly.In the AR1 of this region, the rotation of accompanying rotation magnet 67, datum line L1 is by this region AR1, thus magnetic field can not be changing into S pole or be changing into N pole from S pole from N pole.In addition, region AR1 leaves through center C1 and the medium line L2 vertically extended relative to datum line L1, and therefore the change of magnetic flux density is less, and testing result Y-direction being detected to Hall element 52 brings the possibility of impact low.Therefore, detect Hall element 52 by observing Y-direction from the direction along optical axis OA and be configured in above-mentioned zone AR1, the magnetic influence that rotary magnet 67 pairs of Y-directions detection Hall elements 52 can be suppressed to bring, can improve Y-direction and detect the reliability detected Hall element 52 pairs of positions.In addition, being configured in above-mentioned zone AR1 by Y-direction being detected Hall element 52, Hall element 52 ground can being detected closer to Y-direction and configuring the first actuator 71, inner movable portion 200 more miniaturization can be made.
Above, although consider the magnetic influence that Y-direction detection Hall element (Magnetic Sensor) 52 is subject to from the rotary magnet 67 of the first actuator 71, but preferably the magnetic influence that it is subject to from the rotary magnet 167 of the second actuator 72 is also considered, in the present embodiment, configure in the same manner as the first actuator 71.But, when because of design on restriction, consider simultaneously the first actuator 71 and the second actuator 72 magnetic influence and carry out the configuration difficulty of Magnetic Sensor, the impact paying the utmost attention to the rotary magnet 67 of the first actuator 71 decides the configuration that Y-direction detects Hall element 52, thus can realize the raising that Y-direction detects the accuracy of detection of Hall element 52.
In addition, be more than spinning movement at accompanying rotation magnet 67 and the region AR1 that passes through configures Y-direction detect Hall element (Magnetic Sensor) 52, thus realize alleviating of magnetic influence, but also can pay the utmost attention to the configuration that Y-direction detects Hall element 52.That is, also can be changed the spinning movement scope of rotary magnet 67 by the position of the leading section 6a of adjustment yoke parts 66a and leading section 6b, thus in the scope of region AR1, configure Y-direction detection Hall element (Magnetic Sensor) 52.
Below, with reference to Fig. 9 A and 9C, the configuration condition that Y-direction detection Hall element (Magnetic Sensor) 52 is difficult to be subject to from the driven for opening and closing coil 66b of the first actuator 71 magnetic influence is described.Driven for opening and closing coil 66b is connected with flexible printed board 32f, when by not shown driving circuit supply electric power, produces the magnetic field along the centre line L 3 through coiling.Namely, in consideration through the winding center C2 of driven for opening and closing coil 66b when the transversal L4 vertical with this winding center line L3 and optical axis OA, by detecting Hall element 52 in the position configuration Y-direction significantly do not departed from from this transversal L4, the magnetic influence that driven for opening and closing coil 66b can be suppressed to bring Y-direction detection Hall element 52, can improve Y-direction and detect the reliability detected Hall element 52 pairs of positions.Specifically, when observing from the direction along optical axis OA, being in the scope R0 of low interference capability of less than 45 ° relative to above-mentioned transversal L4 angle θ, configure Y-direction detection Hall element (Magnetic Sensor) 52 that Z-direction is Magnetic testi direction.Particularly, when observing from the direction along optical axis OA, preferably Y-direction is detected Hall element 52 to be configured to its arbitrary portion and all to intersect with above-mentioned transversal L4, when observing from the direction along optical axis OA, more preferably Y-direction being detected Hall element 52 and being configured to its center and being roughly positioned on above-mentioned transversal L4.In addition, substantially vertical, almost parallel in this instructions refers to the scope of vertical direction ± 2 °, parallel direction ± 2 °.
Above, the magnetic influence that Y-direction detection Hall element (Magnetic Sensor) 52 is subject to from the driven for opening and closing coil 66b of the first actuator 71 is considered, but preferably the magnetic influence that the driven for opening and closing coil 166b from the second actuator 72 is subject to also is considered.But, when because of the restriction in design, consider the magnetic influence of the first actuator 71 and the second actuator 72 to carry out the configuration difficulty of Magnetic Sensor simultaneously, the impact paying the utmost attention to the driven for opening and closing coil 66b of the first actuator 71 decides the configuration that Y-direction detects Hall element 52, thus can realize the raising that Y-direction detects the accuracy of detection of Hall element 52.
In addition, the second actuator 72 of light limiting unit 40 and the X-direction of shake correction unit 30 are detected for the configuration relation between Hall element 51, similarly can be suitable for the configuration relation between the first actuator 71 and Y-direction detection Hall element 52.But the second actuator 72 is for making aperture blades 62 on-off action, even if serve harmful effect to the action band of shake correction unit 30, on photography result, that is, image is taken into and brings the possibility of directly impact also low.On the other hand, the first actuator 71 is for making blade 61 on-off action, and direct effect diagram picture is taken into, and when shutter opening and closing, wants the reduction of the operation precision avoiding shake correction unit 30 as possible.From this viewpoint, particularly, make Hall element (Magnetic Sensor) 52 relative to the configuration of the first actuator 71 be difficult to produce magnetic influence become important, with Hall element 51 relative to the second actuator 72 configuration relation compared with more preferably consider.
In lens unit 100 described above, the magnetic field being conceived to produce from actuator 71,72 has directive property, considers independently respectively from the magnetic influence that driven for opening and closing coil 66b, 166b and rotary magnet 67,167 of forming actuator 71,72 produce.Thereby, it is possible to the first actuator 71 and Y-direction are detected near Hall element (Magnetic Sensor) 52 is configured in, lens unit 100 can be made and there is its camera head 1000 miniaturization.
Hall element (Magnetic Sensor) 51,52 is not limited to the illustrative region AR1 and scope R0 of Fig. 9 B and 9C for benchmark relative to the configuration of actuator 71,72, also can be limited the magnetic influence of actuator 71,72 pairs of Hall elements (Magnetic Sensor) 51,52 by additive method.Such as, the flux change amount about Z-direction on the Hall element (Magnetic Sensor) 52 cause the magnetic influence that rotary magnet 67 and the driven for opening and closing coil 66b from the first actuator 71 produces is set to A1, the flux change amount about the Z-direction parallel with optical axis OA of the unit amount of movement on the Hall element (Magnetic Sensor) 52 produced by detected magnet 33b and Hall element (Magnetic Sensor) 52 relative displacement is set to B1, the amount of movement of the picture in the imaging surface of imaging apparatus 300 is set to D1 relative to the ratio of the amount of movement of movable frame 133.Now, it is desirable to be equivalent to below 5 pixels of imaging apparatus 300 from the value A1/B1 × D1 of the disturbing factor of the first actuator 71.Thereby, it is possible to suppress the Hall element (Magnetic Sensor) 52 of the first actuator 71 on shake correction unit 30 of light limiting unit 40 bring impact and make the undesirable displacement of movable frame 133, the detection of high performance position can be carried out.In addition, the ratio D1 of amount of movement is determined by the structure of optical system OS, the configuration of imaging apparatus 300.For flux change amount B1, the value that the maximum magnetic flux variable quantity in Hall element 52 obtains divided by the displacement amplitude of movable frame 133 can also be used as being worth easily.Above value A1, B1, D1 can be divided into the component of X-direction and the component of Y-direction.In this case, about X-direction and Y-direction both sides, above-mentioned condition is all met.Above flux change amount A1 is premised on rotary magnet 67 and driven for opening and closing coil 66b not independent power, but also can assess the value A1/B1 × D1 caused by rotary magnet 67, the value A1/B1 × D1 caused by driven for opening and closing coil 66b respectively.In this case, also there is the assessment of the first actuator 71 on the impact of Hall element (Magnetic Sensor) 52 and also become easy situation.
In addition, such as, the flux change amount about Z-direction on the Hall element (Magnetic Sensor) 51 magnetic influence that rotary magnet 167 and the driven for opening and closing coil 166b from the second actuator 72 produces caused is set to A2, the flux change amount about the Z-direction parallel with optical axis OA of the unit amount of movement on the Hall element (Magnetic Sensor) 51 produced by detected magnet 33a and Hall element (Magnetic Sensor) 51 relative displacement is set to B2, the amount of movement of the picture in the imaging surface of imaging apparatus 300 is set to D2 relative to the ratio of the amount of movement of movable frame 133.Now, it is desirable to be equivalent to below 5 pixels of imaging apparatus 300 from the value A2/B2 × D2 of the disturbing factor of the second actuator 72.Thereby, it is possible to suppress the Hall element (Magnetic Sensor) 52 of the second actuator 72 on shake correction unit 30 of light limiting unit 40 bring impact and apply undesirable displacement to movable frame 133, the detection of high performance position can be carried out.Above value A2, B2, D2 can be divided into the component of X-direction and the component of Y-direction.In this case, about X-direction and Y-direction both sides, above-mentioned condition can be met.But, because with Hall element 51 for the configuration of the second actuator 72, as described above Hall element 52 relative to the first actuator 71 configuration more preferably, so in the device of reality, as A=A1, B=B1, D=D1, value A/B × D is equivalent to below 5 pixels of imaging apparatus 300.
Figure 10 A is the contour map based on the vertical direction of periphery of the rotary magnet 67 being formed in rotation and the measurement result of the magnetic flux density of Z-direction, and Figure 10 B is the contour map of the measurement result of the magnetic flux density of Z-direction based on the periphery being formed in driven for opening and closing coil 66b.In the various figures, can be elevated to a pair region of round dot applying shade the degree can not ignoring magnetic flux density.From Figure 10 A, for rotary magnet 67, in the region that the datum line L1 corresponding with magnetic direction passes through, there is the tendency of magnetic flux density step-down.In addition, from Figure 10 B, for driven for opening and closing coil 66b, in the region near the centre line L 3 corresponding with magnetic direction, there is the tendency that magnetic flux density uprises, in the region that transversal L4 passes through, there is the tendency of magnetic flux density step-down.That is, Y-direction detection Hall element (Magnetic Sensor) 52 preferably configures close to datum line L1, transversal L4.
In addition, in Figure 10 A and Figure 10 B, suppose Magnetic Sensor or Hall element to be configured in the shadow region mediated in line L2 and centre line L 3, possibility movable frame 133 being applied to undesirable displacement is high.Specifically, to be equivalent to the scope of more than 5 pixels of imaging apparatus 300 suitable for the value (A/B × D) of illustrated shadow region and above-mentioned disturbing factor.Here, value A represents the flux change amount about Z-direction the Hall element 52 that the magnetic influence produced from rotary magnet 67 or driven for opening and closing coil 66b causes.
Above, describe the present invention according to embodiment, but the present invention is not limited thereto, can various distortion be carried out.Such as, the present invention may be used for digital camera, also may be used for portable terminal device camera.
In light limiting unit 40, do not need to arrange blade 61 and aperture blades 62 both sides, aperture blades 62 and second actuator 72 of a side can be omitted, or omit blade 61 and first actuator 71 of the opposing party.
In the above-described embodiment, make correction lens LS displacement carry out jitter correction by shake correction unit 30, but imaging apparatus 300 side displacement can also be made to carry out jitter correction by shake correction unit 30.
Claims (8)
1. a lens unit, is characterized in that, has: jitter correction portion, the correction of picture shake when it is made a video recording; Light limiting unit, it limits incident light at least partially,
Described jitter correction portion has: movable frame, and it keeps correction lens and imaging apparatus either party; Fixed frame, it supports described movable frame; Drive division, it drives described movable frame and makes it relative to described fixed frame displacement; Magnetic Sensor, it detects the position of described movable frame,
Described smooth limiting unit has: at least one party in shutter and aperture; Actuator, it has driven for opening and closing coil and rotary magnet, and drives described shutter or described aperture,
The winding center line of this driven for opening and closing coil is configured in the direction substantially vertical with the Magnetic testi direction of described Magnetic Sensor by described driven for opening and closing coil,
By making described rotary magnet rotate centered by the axle almost parallel with the optical axis of optical system, described shutter or described aperture can be made to become open mode and closed condition,
From along described optical axis direction observe time, through described rotary magnet center and represent in the region that the datum line of the magnetic direction of described rotary magnet passes through with the rotation of described rotary magnet, configure described Magnetic Sensor.
2. lens unit as claimed in claim 1, it is characterized in that, the anglec of rotation of described rotary magnet is less than ± 30 °.
3. lens unit as claimed in claim 1 or 2, it is characterized in that, when observing from the direction along described optical axis, relative to through the winding center of described driven for opening and closing coil and the transversal vertical with described winding center line at 45 ° below scope in, configure described Magnetic Sensor.
4. lens unit as claimed in claim 1, is characterized in that, when observing from the direction along described optical axis, through described driven for opening and closing coil winding center and the transversal vertical with described winding center line configures Magnetic Sensor.
5. lens unit as claimed in claim 1, it is characterized in that, the distance about the direction along described optical axis between the winding center of described driven for opening and closing coil and the center of described Magnetic Sensor is 3 ~ 15mm.
6. a lens unit, is characterized in that, has: jitter correction portion, the correction of picture shake when it is made a video recording; Light limiting unit, it limits incident light at least partially,
Described jitter correction portion has: movable frame, and it keeps correction lens and imaging apparatus either party; Fixed frame, it supports described movable frame; Drive division, it drives described movable frame and makes it relative to described fixed frame displacement; Magnetic Sensor, it detects the position of described movable frame; Detected magnet, it is fixed on described movable frame,
Described smooth limiting unit has: at least one party in shutter and aperture; Actuator, it has driven for opening and closing coil and rotary magnet, and drives described shutter or described aperture,
The winding center line of this driven for opening and closing coil is configured in the direction substantially vertical with the Magnetic testi direction of described Magnetic Sensor by described driven for opening and closing coil,
By making described rotary magnet rotate centered by the axle almost parallel with the optical axis of optical system, described shutter or described aperture can be made to become open mode and closed condition,
Flux change amount on the described Magnetic Sensor magnetic influence produced from described actuator caused is set to A, the flux change amount of the unit amount of movement on the described Magnetic Sensor produced by described detected magnet and described Magnetic Sensor relative displacement is set to B, when the amount of movement of the picture in imaging surface is set to D relative to the ratio of the amount of movement of described movable frame, value A/B × D is equivalent to below 5 pixels of described imaging apparatus.
7. the lens unit as described in claim 1 or 6, is characterized in that, described smooth limiting unit at least comprises described shutter, and described actuator drives described shutter opening and closing.
8. a camera head, is characterized in that, has the lens unit described in claim 1 or 6.
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| JP2014-045740 | 2014-03-07 | ||
| JP2014045740A JP2015169850A (en) | 2014-03-07 | 2014-03-07 | Lens unit and imaging device |
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| CN104898348A true CN104898348A (en) | 2015-09-09 |
| CN104898348B CN104898348B (en) | 2018-09-25 |
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| CN109765671A (en) * | 2017-11-09 | 2019-05-17 | 三星电机株式会社 | Camera model |
| CN111190280A (en) * | 2018-11-15 | 2020-05-22 | 精工爱普生株式会社 | Optical path shifting device, image display apparatus, and control method of optical path shifting device |
| JP2021533574A (en) * | 2018-09-25 | 2021-12-02 | ▲蘇▼州▲ユン▼冢▲電▼子科技股▲フン▼有限公司 | Base and voice coil motors with electrical elements |
| CN115004101A (en) * | 2020-01-22 | 2022-09-02 | 富士胶片株式会社 | Optical vibration isolator, optical device, and magnetic sensor fixing method |
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| KR102485461B1 (en) * | 2017-08-07 | 2023-01-06 | 엘지이노텍 주식회사 | Lens driving device, camera module and optical apparatus |
| JP6705783B2 (en) * | 2017-08-16 | 2020-06-03 | セイコーホールディングス株式会社 | Imaging device, blade driving device, and blade driving device control method |
| KR102163416B1 (en) | 2018-08-13 | 2020-10-08 | 삼성전기주식회사 | Aperture module and camera module including the same |
| CN113163071B (en) * | 2020-01-22 | 2022-09-16 | 宁波舜宇光电信息有限公司 | Camera shooting module |
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| Publication number | Publication date |
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| CN104898348B (en) | 2018-09-25 |
| JP2015169850A (en) | 2015-09-28 |
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