Embodiment
Referring to accompanying drawing, the preferred embodiment of the present invention is described.In addition, in each figure used in the following description, each inscape is taked the size of the degree that can identify on accompanying drawing, thus adopt different engineer's scales according to each inscape, the present invention is not limited only to the quantity of these inscapes shown in the drawings, the shape of inscape, the ratio of the size of inscape and the relative position relationship of each inscape.
Lens barrel 1 of the present invention, such as the camera head such as digital camera, digital camera, keeps the photographic optical system consisted of multiple camera lens.
Fig. 1 illustrates the outward appearance of the digital camera 100 of the example as the camera head with lens barrel 1 of the present invention.In addition, in following content, using the axle parallel with the optical axis O of the photographic optical system that the multiple camera lenses etc. kept by lens barrel 1 are formed as Z axis, using perpendicular to 2 axles perpendicular to one another in the plane of Z axis as X-axis and Y-axis.When digital camera 100 is remained so-called erectility, Z axis and X-axis are the axle of level, and Y-axis is vertical axle.X-axis, Y-axis and Z axis suitably illustrate in the various figures.In addition, in following content, about the direction along Z axis, using object side (object side) as front, using image side (imaging apparatus side) as rear.
Digital camera 100 has lens barrel 1, imaging apparatus 102, release-push 103, strobe light unit 104, power switch 105 and zoom operation switch 106 at camera main-body 101.
Strobe light unit 104 is contained in camera main-body 101 when not using, arrange as to give prominence to upward when digital camera 100 being kept upright state in use.Strobe light unit 104 is adapted to, and when being in digital camera 100 of erectility from forward observation, is positioned at the right side of lens barrel 1.
As illustrated schematically in fig. 2, lens barrel 1 as an embodiment of the invention can be changed to following 2 kinds of states, namely keep multiple members of frame of photographic optical system forwards (object side) send and can carry out the photography possible state of the imaging of the image planes in photographic optical system, described multiple members of frame rearward (main body side of digital camera 100) send into and the shortening state that makes the total length of Z-direction shorter than photography state.
In addition, photographic optical system to change the zoom lens of focal length, and lens barrel 1 makes multiple members of frame move along optical axis O, thus can change the focal length of photographic optical system.Fig. 4 is the cut-open view of lens barrel 1 when being in shortening state.Fig. 5 be that lens barrel 1 is in photography state and the focal length of photographic optical system is the shortest wide-angle side when cut-open view.Fig. 6 be that lens barrel 1 is in photography state and the focal length of photographic optical system is the telescope end grown most when cut-open view.Concrete condition describes later, and the change action of the shortening state of lens barrel 1 and the switching action of photography state and focal length is mainly undertaken by the power of the electro-motor that comprises in zoom driving unit 31 and zoom drive motor 31a.
Fig. 7 is the exploded perspective view of lens barrel 1.In addition, Fig. 8 is the stereographic map at the back side representing lens barrel 1.Fig. 9 is using the cut-open view (the IX-IX cut-open view of Fig. 4) of the plane vertical with optical axis O as section.Figure 10 is the stereographic map being exaggerated base portion 2.
The photographic optical system that lens barrel 1 keeps be have positive refracting power the 1st lens combination 21, have negative refractive power the 2nd lens combination 22, have positive refracting power the 3rd lens combination 23, there is the 4th lens combination 24 of negative refractive power and there are 5 groups of structures of the 5th lens combination 25 of positive refracting power.In addition, between the 2nd lens combination 22 and the 3rd lens combination 23, be equipped with the shutter/aperture stop unit 16 with tripper and aperture device.The shutter/aperture stop unit 16 of present embodiment has the mechanism of selectivity configuration ND filter (neutral density filter) on optical axis O.
Lens barrel 1 has the 1st lens combination holding frame 11, the 2nd lens combination holding frame 12, the 3rd lens combination holding frame 13, the 4th lens combination holding frame 14 and the 5th lens combination holding frame 15 that keep the 1st lens combination 21, the 2nd lens combination 22, the 3rd lens combination 23, the 4th lens combination 24 and the 5th lens combination 25 respectively.Shutter/aperture stop unit 16 is disposed in the 3rd lens combination holding frame 13.
Details will describe later, lens barrel 1 has the camera lens translation mechanism portion 40 realized based on the image shake correction function of so-called camera lens translation mode, by making the 3rd lens combination 23 as translation lens combination move abreast with the plane perpendicular to optical axis O, picture is moved on imaging surface.Camera lens translation mechanism portion 40 is disposed in the 3rd lens combination holding frame 13.
In addition, lens barrel 1 has the base portion 2 keeping imaging apparatus 102, fixed frame 3 fixing in base portion 2, be supported in fixed frame 3 and when zoom action and contractive action time be driven in rotation and on the direction along optical axis O by retreat drive cam frame 4, rotating the floating key 5 of retreating on the direction along optical axis O together with cam frame 4 under restriction state, rotating the lead-frame 6 of retreating on the direction along optical axis O together with cam frame 4 under restriction state, cam frame 4 is carried out to the zoom driving unit 31 as the 1st lens driving portion of rotary actuation, the 4th lens combination driver element 34 driven of retreating is carried out to the 4th lens combination holding frame 14 in direction along optical axis O, the 5th lens combination driver element 35 as the 2nd lens driving portion driven of retreating is carried out to the 5th lens combination holding frame 15 in direction along optical axis O.1st lens combination holding frame 11, the 2nd lens combination holding frame 12 and the 3rd lens combination holding frame 13 rotate restriction state, retreated on the direction of optical axis O by being rotated in of cam frame 4.
The details of each structure of lens barrel 1 is below described.
Base portion 2 is the parts of substantially planar, and optical axis O keeps imaging apparatus 101.That is, the position of base portion 2 is fixed relative to the image planes of the photographic optical system being in photography possible state.As shown in Figure 10 amplifies, uprightly arrange leading axle 17 and 18 at the front surface of base portion 2, this leading axle 17 and 18 is retired dynamic mode and is guided can make them enterprising along the direction of optical axis O the 4th lens combination holding frame 14 and the 5th lens combination holding frame 15.The parts of leading axle 17 and 18 to be sections be circular pole shape, in the mode that central shaft is parallel with optical axis O, base portion 2 are fixed.4th lens combination holding frame 14 and the 5th lens combination holding frame 15 are formed respectively along the bearing portion that leading axle 17 and 18 slides.
In addition, the spline axle 19 limited around the rotation of leading axle 17 and 18 the 4th lens combination holding frame 14 and the 5th lens combination holding frame 15 is uprightly set at the front surface of base portion 2.The parts of spline axle 19 to be sections be circular pole shape, fix in base portion 2 in the mode that central shaft is parallel with optical axis O.4th lens combination holding frame 14 and the 5th lens combination holding frame 15 are formed the bearing portion slided along spline axle 19.
In addition, base portion 2 is equipped with the 5th lens combination driver element 35 as the 2nd lens driving portion.5th lens combination driver element 35 is configured to be had: the nut 35c possess the stepper motor 35a of the output shaft of rotation, the externally threaded screw 35b rotated together with the output shaft of stepper motor 35a, having the internal thread part screwed togather with screw 35b.
Screw 35b gives prominence to forward from the front surface of base portion 2, arranges in the mode that turning axle is parallel with optical axis O.The rotation of nut 35c is limited, along with the rotation of screw 35b, along the direction of optical axis O enterprising retire dynamic.5th lens combination holding frame 15 is exerted a force by volute spring 35d and abuts with nut 35c, along with the movement of nut 35c along the direction of optical axis O enterprising retire dynamic.
The leading axle 18 that 5th lens combination holding frame 35 is guided and spline axle 19, be equipped on as upper/lower positions to the 5th lens combination driver element 35 that the 5th lens combination holding frame 35 drives: when observing from the direction along optical axis O, the external diameter comparing the 3rd lens combination holding frame 13 described later is in the position of inner side.
Fixed frame 3 is parts fixing on camera main-body 101 and base portion 2, in the multiple roughly cylindric members of frame forming lens barrel 1, be disposed in most peripheral.Cam path 3a, straight-line groove 3b and 3c is equipped at the inner peripheral surface of the fixed frame 3 of substantially cylindrical shape.Cam path 3a is formed by connecting by the tipper 3a1 formed on the direction tilted relative to optical axis O and the circumferential groove 3a2 formed on circumferential.Be embedded in the cam follower 4c that the outer peripheral face 4a of cam frame 4 described later is arranged in the mode that can slide in cam path 3a.In addition, straight-line groove 3b with 3c is the groove of the linearity parallel with optical axis O.The jut that the outer peripheral face being trapped in floating key 5 described later in the mode that can slide in straight-line groove 3b is arranged.Be trapped in the jut 6a that the outer peripheral face of lead-frame 6 described later is arranged in the mode that can slide in straight-line groove 3c.
Zoom driving unit 31 and the 4th lens combination driver element 34 is equipped in the periphery of fixed frame 3.As shown in Figure 3, when from front sight glass head lens barrel 1, zoom driving unit 31 is disposed in across the relative position of optical axis O with the 4th lens combination driver element 34.In addition, when being in digital camera 100 of erectility from forward observation, zoom driving unit 31 is disposed in the bottom-right location relative to optical axis O, and the 4th lens combination driver element 34 is disposed in the top-left position relative to optical axis O.
In digital camera 100, zoom driving unit 31 is given prominence to from the bottom of lens barrel 1 towards right side, in the space of the upside of this zoom driving unit 31, arrange strobe light unit 104.
Zoom driving unit 31 comprises multiple gears of zoom drive motor 31a, spool gear 31b and following explanation.Spool gear 31b is the pinion wheel with the turning axle parallel with optical axis O, as shown in Figure 9, exposes in the inner circumferential of fixed frame 3.Spool gear 31b engages with the gear part 4g arranged in the periphery of cam frame 4.Zoom drive motor 31a is the servomotor producing power spool gear 31b being carried out to rotary actuation.The transmission gear mechanism that the power of zoom drive motor 31a is formed through multiple gears as shown in Figure 2 transmits to spool gear 31b.Zoom drive motor 31a and transmit gear mechanism and be incorporated in the gearcase 31h that arranges in the mode of giving prominence to from the outer peripheral face of fixed frame 3.Transmit gear mechanism to be formed by worm screw 31c, worm gear 31d, 1Z gear 31e, 2Z gear 31f and idle gear 31g.
Zoom drive motor 31a arranges as turning axle is roughly parallel to the plane (XY plane) vertical with optical axis O at the rear side of gearcase 31h.The turning axle of zoom drive motor 31a is fixed with worm screw 31c.The worm gear 31d engaged with this worm screw 31c arranges as turning axle is parallel with optical axis O.As above, by so-called worm drive mechanism, the turning axle of the output of zoom drive motor 31a approximately bends 90 degree.
In gearcase 31h, 1Z gear 31e, 2Z gear 31f and idle gear 31g are equipped on the front side of zoom drive motor 31a in the mode that turning axle is parallel with optical axis O.1Z gear 31e engages with worm gear 31d, and idle gear 31g engages with spool gear 31b.The rotation of worm gear 31d is transmitted to spool gear 31b via 1Z gear 31e, 2Z gear 31f and idle gear 31g.
In the present embodiment, adopt so-called 2 Rotating fields configuring zoom drive motor 31a and 1Z gear 31e, 2Z gear 31f and idle gear 31g in the gearcase of zoom driving unit 31 in mode overlapping on optical axis O direction, thus inhibit gearcase 31h height in the Y direction.That is, in the present embodiment, when being in digital camera 100 of erectility from forward observation, the height of gearcase 31h at above-below direction can be reduced.Thereby, it is possible to increase the space arranging strobe light unit 104 (shown in Fig. 3) above gearcase 31h in the vertical direction.
4th lens combination driver element 34 is configured to be had: the stepper motor 34a with the output shaft of rotation; The externally threaded not shown screw rotated together with the output shaft of stepper motor 35a; And there is the not shown nut of the internal thread part screwed togather with screw.
4th lens combination driver element 34 is configured in the same manner as the 5th above-mentioned lens combination driver element 35, carries out rotary actuation by stepper motor 34a to screw, and on the direction along optical axis O, drive nut is retreated.4th lens combination holding frame 34 together with this nut along the direction of optical axis O enterprising retire dynamic.
Cam frame 4 is roughly cylindric parts, embeds the inner peripheral portion of fixed frame 3 with state that is free to rotate and that retreat.
Be formed at the rear quadrate part of the outer peripheral face 4a of cam frame 4: embed the multiple cam follower 4c in multiple cam path 3a of fixed frame 3 respectively in the mode that can be free to slide, and with the spool gear 31b meshed gears portion 4g of zoom driving unit 31.
As mentioned above, the cam follower 4c of cam frame 4 embeds the cam path 3a of fixed frame 3 in the mode that can be free to slide, gear part 4g engages with spool gear 31b.Therefore, by the power of zoom driving unit 31, cam frame 4 is rotated.When cam frame 4 rotates, the cam follower 4c of this cam frame 4 moves along the cam path 3a of fixed frame 3.
When lens barrel 1 is for shortening state, if cam frame 4 rotates to from counter clockwise direction during forward observation, then in the scope that cam follower 4c is absorbed in tipper 3a1, advance in rotation limit, cam frame 4 limit.In addition, in the scope that cam follower 4c is absorbed in circumferential groove 3a2, cam frame 4 is not retreated mobile and rotates on the direction along optical axis O.
Here, lens barrel 1 from the shortening state shown in Fig. 4 to become as photography possible state Fig. 5 shown in wide-angle side state nearby during in, cam follower 4c is absorbed in tipper 3a1.When lens barrel 1 is for photography possible state, when namely lens barrel 1 is between the state of the wide-angle side shown in Fig. 5 and the state of the telescope end shown in Fig. 6, cam follower 4c is absorbed in circumferential groove 3a2.That is, when lens barrel 1 is for photography possible state, cam frame 4 is not retreated on the direction along optical axis O, and is only driven in sense of rotation by zoom driving unit 31.
In addition, as is illustrated by figs. 11 and 12, multiple cam path is set at the outer peripheral face 4a of cam frame 4 and inner peripheral surface 4b engraving.Figure 11 is the stretch-out view part of the barrel surface of the outer peripheral face 4a of cam frame 4 being expanded into plane, and Figure 12 is the stretch-out view inner peripheral surface 4b of the barrel surface as cam frame 4 being expanded into plane.
The outer peripheral face 4a engraving of cam frame 4 is provided with these totally 6 articles of cam paths of 3 article of the 1st main cam groove 4d with identical cam contour and 3 article of the 1st auxiliary cam groove 4e with identical cam contour.1st main cam groove 4d and the 1st auxiliary cam groove 4e is arranged alternately in the circumferential.
Cam frame 4 is absorbed in the inner side of the 1st lens combination holding frame 11.The 1st lens combination holding frame 11 inner peripheral surface protrude arrange main cam driven member 11a and auxiliary cam driven member 11b be absorbed in the 1st main cam groove 4d and the 1st auxiliary cam groove 4e in the mode that can slide.
In addition, on the inner peripheral surface 4b of cam frame 4, engraving is provided with 3 article of the 2nd cam path 4f with identical cam contour.Protrude the cam follower 12a of setting at the outer peripheral face of the 2nd lens combination holding frame 12 and be absorbed in the 2nd cam path 4f at the cam follower 13a that the outer peripheral face protrusion of the 3rd lens combination holding frame 13 is arranged in the mode that can slide.
About the multiple cam path formed on cam frame 4 and the details of cam follower being absorbed in this cam path, will describe later.
Floating key 5 is formed as drum, and the inner peripheral portion of cam frame 4 embeds in the mode that can relatively rotate freely.Fig. 7 represents the state that floating key 5 sinks at cam frame 4.
Be provided with jut at the peripheral part of the rear end of floating key 5, this jut embeds the straight-line groove 3b of fixed frame 3 in the mode that can slide.This jut embeds the straight-line groove 3b of fixed frame 3 in the mode that can slide, thus restriction floating key 5 is relative to the rotation of fixed frame 3 around optical axis O.
In addition, floating key 5 is can carry out relative to rotation and not engaging with cam frame 4 relative to relatively retreat on the direction along the optical axis O mode of movement of cam frame 4 around optical axis O relative to cam frame 4.
In the cylindrical portion being absorbed in cam frame 4 of floating key 5,3 straight lines be formed using the direction parallel with optical axis O as long side direction stitch 5b and 3 straight line and stitch 5c.Straight line seam 5b and 5c periphery in floating key 5 is through.Straight line seam 5b and 5c alternately arranges in circumference.
2nd lens combination holding frame 12 and the 3rd lens combination holding frame 13 are absorbed in the inner side of floating key 5.In the inner side of floating key 5, the 2nd lens combination holding frame 12 is positioned at the front of the 3rd lens combination holding frame 13.
The cam follower 12a arranged is protruded through in straight line seam 5b in the mode that can slide at the outer peripheral face of the 2nd lens combination holding frame 12.Thus, the 2nd lens combination holding frame 12 is limited relative to the rotation of fixed frame 3 around optical axis O, but can retreat on the direction parallel with optical axis O.In addition, the cam follower 13a arranged is protruded at the outer peripheral face of the 3rd lens combination holding frame 13 through in straight line seam 5c in the mode that can slide.Thus, the 3rd lens combination holding frame 13 is limited relative to the rotation of fixed frame 3 around optical axis O, but can retreat on the direction parallel with optical axis O.
As mentioned above, in the 2nd cam path 4f that the cam follower 12a that has of the 2nd lens combination holding frame 12 and the 3rd lens combination holding frame 13 and cam follower 13a is formed with the inner peripheral surface 4b that the mode that can slide is trapped in cam frame 4.Therefore, when cam frame 4 rotates around optical axis O, the 2nd lens combination holding frame 12 and the 3rd lens combination holding frame 13 along the shape of the 2nd cam path 4f, in the direction parallel with optical axis O enterprising retire dynamic.
Lead-frame 6 is roughly cylindric parts, is disposed in the outside of the 1st lens combination holding frame 11 and the inner side of fixed frame 3.The jut 6a of the straight-line groove 3c embedding fixed frame 3 in the mode that can slide is provided with at the peripheral part of the rear end of lead-frame 6.This jut 6a embeds the straight-line groove 3c of fixed frame 3 in the mode that can slide, thus limits lead-frame 6 relative to the rotation of fixed frame 3 around optical axis O.
In addition, lead-frame 6 is carrying out engaging with cam frame 4 around the mode of relative to rotation and not carrying out relative advance and retreat movement relative to cam frame 4 on the direction along optical axis O of optical axis O relative to cam frame 4.
The inner peripheral surface of lead-frame 6 is formed with groove and the straight-line groove 6b of the linearity parallel with optical axis O.The jut 11c arranged at the outer peripheral face of the 1st lens combination holding frame 11 is absorbed in straight-line groove 6b in the mode that can slide.Thus, the 1st lens combination holding frame 11 is limited relative to the rotation of fixed frame 3 around optical axis O, but can retreat on the direction parallel with optical axis O.
As mentioned above, in the 1st main cam groove 4d that formed with the outer peripheral face 4a that the mode that can slide is trapped in cam frame 4 of the main cam driven member 11a that has of the 1st lens combination holding frame 11 and auxiliary cam driven member 11b and the 1st auxiliary cam groove 4e.Therefore, when cam frame 4 rotates around optical axis O, the 1st lens combination holding frame 11 along the shape of the 1st main cam groove 4d and the 1st auxiliary cam groove 4e, in the direction parallel with optical axis O enterprising retire dynamic.
Then, the details of multiple cam paths that cam frame 4 is formed is described.
As shown in figure 11, main cam groove 4d and 3 article of the 1st auxiliary cam groove 4e that the outer peripheral face 4a of cam frame 4 be circumferentially alternately formed with 3 article the 1st.1st main cam groove 4d and the 1st auxiliary cam groove 4e is identical cam contour, and the 1st auxiliary cam groove 4e is disposed in the front of the 1st main cam groove 4d.In the present embodiment, by as above making the 1st main cam groove 4d and the 1st auxiliary cam groove 4e stagger in the longitudinal direction, thus 6 cam paths with identical cam contour can be formed.
The main cam driven member 11a of the 1st lens combination holding frame 11 and auxiliary cam driven member 11b is absorbed in the 1st main cam groove 4d and the 1st auxiliary cam groove 4e in the mode that can slide.In fig. 11, the position of main cam driven member 11a when representing that lens barrel 1 is shortening state by symbol 11a (R), the position of main cam driven member 11a when representing that lens barrel 1 is wide-angle side state by symbol 11a (W), the position of main cam driven member 11a when representing that lens barrel 1 is telescope end state by symbol 11a (T).In addition, in fig. 11, the position of auxiliary cam driven member 11b when representing that lens barrel 1 is shortening state by symbol 11b (R), the position of auxiliary cam driven member 11b when representing that lens barrel 1 is wide-angle side state by symbol 11b (W), the position of auxiliary cam driven member 11b when representing that lens barrel 1 is telescope end state by symbol 11b (T).
Here, the 1st auxiliary cam groove 4e is set to than the chimeric mitigation between the 1st main cam groove 4d and main cam driven member 11a with the chimeric between auxiliary cam driven member 11b.Specifically, the 1st main cam groove 4d remains with main cam driven member 11a the state contacted, and there is gap between the 1st auxiliary cam groove 4e and auxiliary cam driven member 11b.
That is, the 1st lens combination holding frame 11 is carry out with the engaging between main cam driven member 11a the 1st main cam groove 4d by 3 with being rotated in along the movement on the direction of optical axis O of cam frame 4.In the present embodiment, when due to fall etc. external force is applied to the 1st lens combination holding frame 11, except 3 to the 1st main cam groove 4d except the engaging between main cam driven member 11a, due to 3 to the holding section of the 1st auxiliary cam groove 4e and auxiliary cam driven member 11b also for bearing the structure of this external force, thus not easily there is coming off of the 1st lens combination holding frame 11.
On the other hand, as shown in figure 12,3 article of the 2nd cam path 4f is formed with at the inner peripheral surface 4b of cam frame 4.The cam follower 12a of the 2nd lens combination the holding frame 12 and cam follower 13a of the 3rd lens combination holding frame 13 is absorbed in the 2nd cam path 4f in the mode that can slide.
In fig. 12, the position of cam follower 12a when representing that lens barrel 1 is shortening state by symbol 12a (R), the position of cam follower 12a when representing that lens barrel 1 is wide-angle side state by symbol 12a (W), the position of cam follower 12a when representing that lens barrel 1 is telescope end state by symbol 12a (T).In addition, in fig. 12, the position of cam follower 13a when representing that lens barrel 1 is shortening state by symbol 13a (R), the position of cam follower 13a when representing that lens barrel 1 is wide-angle side state by symbol 13a (W), the position of cam follower 13a when representing that lens barrel 1 is telescope end state by symbol 13a (T).
Figure 13 illustrates the relation the rotation angle θ of the cam frame 4 of the lens barrel 1 of present embodiment and the distance L pushed up from image planes to the face of the 1st ~ 3rd lens combination.In the curve map shown in Figure 13, transverse axis is the rotation angle θ of the cam frame 4 from wide-angle side state to telescope end state.The angle of the cam frame 4 that θ Wide (wide-angle) is lens barrel 1 when being wide-angle side state, the angle of the cam frame 4 that θ Tele (looking in the distance) is lens barrel 1 when being telescope end state.
In addition, in the curve map shown in Figure 13, the longitudinal axis is the distance L from image planes to top, the face of each lens combination.Curve G1 shown in solid line represents the distance from image planes to top, the face of the 1st lens combination 21, curve G2 shown in dotted line represents the distance from image planes to top, the face of the 2nd lens combination 22, and the curve G3 shown in single dotted broken line represents the distance from image planes to top, the face of the 3rd lens combination 23.
As shown in figure 13, in the lens barrel 1 of present embodiment, when carrying out zoom action from wide-angle side to telescope end, the 1st lens combination 21 moves backward object side and moves to image side, and the 2nd lens combination 22 moves to image side, and the 3rd lens combination 23 moves to object side.Brightness aperture moves together with the 3rd lens combination 23.
In addition, although do not illustrate, and in the lens barrel 1 of present embodiment, when carrying out zoom action from wide-angle side to telescope end, the 4th lens combination 24 moves to object side, and the 5th lens combination G5 moves to image side.
Then, the detailed construction of the 3rd lens combination holding frame 13 is described.As mentioned above, the 3rd lens combination holding frame 13, except keeping the 3rd lens combination 23, also keeps shutter/aperture stop unit 16 and camera lens translation mechanism portion 40.Figure 14 is the stereographic map of the 3rd lens combination holding frame 13.Figure 15 is the exploded perspective view in camera lens translation mechanism portion 40.Figure 16 is the figure from forward observation the 3rd lens combination holding frame 13 and movable frame 41.Figure 17 is the XVII-XVII cut-open view of Figure 16.
Camera lens translation mechanism portion 40 is configured to make the 3rd lens combination 23 along the planar movement vertical with optical axis O.In the photographic optical system of present embodiment, the 3rd lens combination 23 along the planar movement vertical with optical axis O, thus makes the image space in image planes move.
As shown in figure 15, camera lens translation mechanism portion 40 be configured to have fix the 3rd lens combination 23 movable frame 41, produce make movable frame 41 along the camera lens translation actuator 50 of the power of the planar movement vertical with optical axis O.
The cylindrical portion 41a that movable frame 41 has the substantially cylindrical shape of fixing the 3rd lens combination 23 in inside, the flange part 41b extended from the outer peripheral face of cylindrical portion 41a towards radial outside.It is can relative to the 3rd camera lens group holding frame 13 along the plane relative movement vertical with optical axis O that movable frame 41 arranges.
Specifically, as shown in Figure 15 and Figure 16, movable frame 41 the back side of flange part 41b give prominence to the inner side in the 3rd camera lens group holding frame 13 and tabular that optical axis O is substantially vertical support sector 13b front surface between sandwiched 3 balls 44.3 positions near 3 balls 44, are erected on flange part 41b and support sector 13b towards support sector 13b the volute spring 45 that flange part 41b exerts a force.Movable frame 41, can relative to the 3rd camera lens group holding frame 13 along the plane relative movement vertical with optical axis O by the rotation of this ball 44.
In addition, the through through hole 13c of optical axis O is formed with being arranged on the support sector 13b in the 3rd lens combination holding frame 13.In addition, support sector 13b is formed with through hole 13d, 13e and 13f through on the direction almost parallel with optical axis O.
Through hole 13d is formed in as upper/lower positions: when observing from the direction along optical axis O, overlapping with the stepper motor 35a of the 5th lens combination driver element 35 and screw 35b.When lens barrel 1 is for shortening state, the screw 35b forwards given prominence to from base portion 2 runs through in this through hole 13d.
In addition, through hole 13e and 13f is formed in as upper/lower positions: when observing from the direction along optical axis O, overlapping with leading axle 18 and spline axle 19 respectively.When lens barrel 1 is for shortening state, the leading axle 18 forwards given prominence to from base portion 2 and spline axle 19 run through in through hole 13e and 13f.
Camera lens translation actuator 50 has the structure producing the so-called voice coil motor of driving force by making coil midstream excess current in the magnetic field of permanent magnet.The principle of voice coil motor is known, thus omits the description.
Camera lens translation actuator 50 comprises for generation of the permanent magnet 51x of the driving force in the direction along X-axis and coil 52x, for generation of the permanent magnet 51y of the driving force in the direction along Y-axis and coil 52y.
Permanent magnet 51x and 51y is fixed on the flange part 41b of movable frame 41.In addition, coil 52x and coil 52y is fixed on the rear side of shutter/aperture stop unit 16.
Permanent magnet 51x and 51y of formation camera lens translation actuator 50 and coil 52x and coil 52y is disposed in the radial outside of side, i.e. the 3rd lens combination 23 of the 3rd lens combination 23 in the 3rd lens combination holding frame 13.In other words, permanent magnet 51x and 51y and the coil 52x and coil 52y that form camera lens translation actuator 50 are disposed in the position overlapping with the 3rd lens combination 23 on the direction along optical axis O.
Here, as shown in Figure 9, when from along the direction sight glass head lens barrel 1 of optical axis O, camera lens translation actuator 50 is disposed in not overlapping with the 5th lens combination driver element 35, leading axle 18 and the spline axle 19 that arrange in base portion 2 position.
More specifically, when being in digital camera 100 of erectility from forward observation, camera lens translation actuator 50 is disposed in the left side of the 3rd lens combination 23 and the region of downside.When being in digital camera 100 of erectility from forward observation, permanent magnet 51x and coil 52x is disposed in the left of the 3rd lens combination 23, and permanent magnet 51y and coil 52y is disposed in the below of the 3rd lens combination 23.
Further, although do not make diagram, however camera lens translation actuator 50 have the path for controlling the magnetic line of force the yoke be made up of magnetic, for detecting the Hall element etc. of movable frame 41 relative to the relative position of the 3rd lens combination 23.
Shutter/aperture stop unit 16 is fixed on the front of the 3rd lens combination holding frame 13, and arranging is given prominence to from shutter/aperture stop unit 16 towards the rear for above-mentioned coil 52x and coil 52y.
In addition, shutter/aperture stop unit 16 has the shutter actuator 16a, the driving aperture actuator 16b of aperture and the ND filter actuator 16c of driving N D filter that drive shutter.These shutter actuators 16a, aperture actuator 16b and ND filter actuator 16c give prominence to towards the rear of shutter/aperture stop unit 16, as shown in the cut-open view of Fig. 9, are positioned at the side of the 3rd lens combination 23.In other words, the rear end of shutter actuator 16a, aperture actuator 16b and ND filter actuator 16c is positioned at the position rearward, front end than the 3rd lens combination 23, and the direction along optical axis O is disposed in the position overlapping with the 3rd lens combination 23.
Here, as shown in Figure 9, when from along the direction sight glass head lens barrel 1 of optical axis O, shutter actuator 16a, aperture actuator 16b and ND filter actuator 16c are disposed in not overlapping with camera lens translation actuator the 50, the 5th lens combination driver element 35, leading axle 18 and spline axle 19 position.
In the lens barrel 1 of present embodiment, when become shortening state thus the 3rd lens combination holding frame 13 closest to base portion 2, be positioned at the side of the 3rd lens combination 23 from the front side end that the 5th lens combination driver element 35, leading axle 18 and spline axle 19 that base portion 23 is forwards outstanding are respective.
As mentioned above, as be disposed in the 3rd lens combination holding frame 13 the camera lens translation actuator 50 of parts of side of the 3rd lens combination 23, shutter actuator 16a, aperture actuator 16b and ND filter actuator 16c be provided in observe from the direction along optical axis O not overlapping with the 5th lens combination driver element 35, leading axle 18 and spline axle 19 position, thus they can not be interfered.
In addition, the input and output to the electric power supply of camera lens translation actuator 50, shutter actuator 16a, aperture actuator 16b and ND filter actuator 16c and control signal carry out through the 2nd flexible printed wiring board 61 as shown in Figure 14.2nd flexible printed wiring board 61 as shown in Figure 8, by drawing to the outer peripheral face of fixed frame 3.Being arranged in the mode of the outer peripheral face along fixed frame 3 by the position of drawing to the outer peripheral face of fixed frame 3 of 2nd flexible printed wiring board 61, via the connector 62 of planar, is electrically connected with the 1st flexible printed wiring board 60 having installed imaging apparatus 102.1st flexible printed wiring board 60 is connected with the not shown control substrate of digital camera 100 at connecting portion 60a.
As mentioned above, the lens barrel 1 of present embodiment in the shake correction mechanism of camera lens parallel-moving type as around the 3rd lens combination 23 of movable camera lens, except the translation of configuration camera lens is with except actuator 50, be also configured with shutter actuator 16a, aperture actuator 16b and ND filter actuator 16c.
In addition, in the lens barrel 1 of present embodiment, when observing from the direction along optical axis O, by being used for, external diameter than the 3rd lens combination holding frame 13 is disposed in the inner part and than the external diameter position in the outer part of the 3rd lens combination 23 to the 5th lens combination 25 carry out the retreating leading axle 18, spline axle 19 and the 5th lens combination driver element 35 that drive.
The leading axle 18, spline axle 19 and the 5th lens combination driver element 35 that drive for carrying out advance and retreat to the 5th lens combination 25 are given prominence to forward from base portion 2, but, they are when lens barrel 1 is for shortening state, as shown in Figure 9, the position of not disturbing with the camera lens translation actuator 50 arranged around the 3rd lens combination 23, shutter actuator 16a, aperture actuator 16b and ND filter actuator 16c is configured at.
The lens barrel 1 with the present embodiment of this structure is disposed in external diameter position in the inner part than the 3rd lens combination holding frame 13 by being used for the 5th group of camera lens holding frames 15 carry out the retreating leading axle 18, spline axle 19 and the 5th lens combination driver element 35 that drive, thus overall external diameter can be reduced, and, also by the 3rd lens combination holding frame 13 that makes to have camera lens translation actuator 50 when shortening state close to base portion 2, total length during shortening state can be made thus to shorten.
On the other hand, in the photographic optical system of present embodiment, the external diameter that the external diameter of the 1st lens combination 21 compares the 2nd lens combination 22 is larger.Therefore, when lens barrel 1 is in shortening state, as shown in figure 18, can the past side by a part of the front surface part 12d of the 1st lens combination 21 visual confirmation the 2nd lens combination holding frame 12.
So, in the lens barrel 1 of present embodiment, the 2nd lens combination holding frame 12 front surface part 12d, lens barrel 1 be shortening state time can by the region of the 1st lens combination 21 visual confirmation, mark represents the character string of at least 1 among model, ProductName, brand name, fabricator's name and camera lens specification.In addition, the mark of character string is such as undertaken by printing.
Like this, if being disposed in the front surface part 12d tab character string of the 2nd lens combination holding frame 12 of inner side of lens barrel 1, then can prevent because wearing and tearing etc. make this mark desalinate situation about disappearing.
In addition, the invention is not restricted to above-mentioned embodiment, can suitably change in the scope without prejudice to the inventive concept read in full from claims and instructions or thought, the lens barrel with this change also should belong to technical scope of the present invention.
Lens barrel of the present invention is not limited to the mode arranged in so-called digital camera, can certainly be to be arranged at the mode that mobile communication terminal, game machine, digital media player etc. possess the electronic equipment of camera function.