CN101430413B - Mechanism for controlling position of optical element - Google Patents

Mechanism for controlling position of optical element Download PDF

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Publication number
CN101430413B
CN101430413B CN2008101755554A CN200810175555A CN101430413B CN 101430413 B CN101430413 B CN 101430413B CN 2008101755554 A CN2008101755554 A CN 2008101755554A CN 200810175555 A CN200810175555 A CN 200810175555A CN 101430413 B CN101430413 B CN 101430413B
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China
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optical element
arm
holding member
bias
bias unit
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CN2008101755554A
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CN101430413A (en
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野村博
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Hoya Corp
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Hoya Corp
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Abstract

An optical element position control mechanism comprises an optical element holding member for holding an optical element which is moveable in an optical axis direction; an advancing and retracting movement guide member for guiding the optical element holding member in the optical axis direction; and a biasing device, spring including an arm, the arm being rotatable or swingable about a pivot axis which is substantially orthogonal to the optical axis wherein said biasing device simultaneously exerts via said arm both a biasing force in the direction of movement of the optical element holding member and a biasing force in a direction orthogonal to the direction of movement of the optical element holding member.

Description

Be used to control the mechanism of position of optical element
Technical field
The present invention relates to be used to control the mechanism of position of optical element, wherein optical element in optical devices along moving on the optical axis direction.
Background technology
In optical devices (for example camera); A kind of mechanism wherein inserts bullport with leading axle and makes vertically being free to slide of its leading axle parallel with optical axis with respect to the bullport edge, and another mechanism; Wherein with guide protrusion and guiding groove engagement; Making vertically being free to slide of its guiding groove parallel with optical axis with respect to the guiding groove edge, is that guide is moved in forward/back known in the art, is used on optical axis direction, moving the optical element holding member of supporting optical component (for example lens combination).The guide that comprises the aforementioned type of leading axle and bullport for example is disclosed among the open 2000-206391 of japanese unexamined patent.
In the guide of the above-mentioned type, between bullport and leading axle, and each part slidably between guiding groove and the guide protrusion, take to clear up in advance, so that can carry out relative sliding motion.In addition, get rid of gap (backlash),, and can carry out stable position control with vibration and the noise of avoiding to cause by removing through measuring.
Summary of the invention
The present invention proposes a kind of position of optical element control gear, can easily eliminate the forward/back of optical element holding member and move the gap in the guide to save the mode in space.
According to an aspect of the present invention, proposed a kind of position of optical element control gear, having comprised: the optical element holding member that is used to keep the optical element of camera chain; Be used for making it and to move guide member in the forward/back that optical axis direction moves along the optical axis direction guided optical element holding member of camera chain; And the bias unit that comprises arm, wherein arm can be around basic vertical and swing with the axis of swing of optical element holding member engagement with optical axis.Bias unit is through arm, on the optical element holding member, applies simultaneously along the bias force of the moving direction of the optical element holding member that is moved the guide member guiding by forward/back with along the bias force of the vertical direction of optical element holding member moving direction.
It is desirable to, bias unit is a torsionspring, comprising: by separating the coiling part of the support member supports that provides with the optical element holding member, the central shaft and the axis of swing basically identical of wherein coiling part; The first arm part that constitutes arm and extend from coiling part outward radial with the engagement of optical element holding member; And second arm portion from extending with the rich part outward radial of the dish of support component engagement.According to moving of optical element holding member, torsionspring changes elastically-deformable amount on the direction of rotating around axis of swing.Under the application of force state of bias unit, wherein the first arm part and the engagement of optical element holding member, the first arm part is along being extended by the defined swinging plane of the oscillating motion that centers on axis of swing.Under the free state of bias unit, wherein the first arm part is separated with the optical element holding member, and the first arm partly is positioned at outside the swinging plane.When bias unit when free state gets into application of force state, the first arm part is along making its direction generation elastic deformation consistent with swinging plane.
It is desirable to, the arm of bias unit comprises bar, and an end of bar rotates separating on the support component that provides with the optical element holding member, the other end of bar and the engagement of optical element holding member.Bias unit comprises the bar bias component that is used for around the rotation direction upper offset bar one of forward and backward of axis of swing.At the application of force state of bias unit, its king-rod and the engagement of optical element holding member, bar is along being extended around the defined swinging plane of axis of swing oscillating motion by it.In the free state of bias unit, its king-rod separates with the optical element holding member, and bar is positioned at outside the swinging plane.When bias unit when free state gets into application of force state, bar is along the direction generation elastic deformation near swinging plane.
It is desirable to, forward/back is moved guide member and is comprised leading axle, and it extends along optical axis direction.The optical element holding member comprises bullport, and leading axle is inserted into and wherein makes it slidably.The arm of bias unit contacts with the contact portion of next-door neighbour's bullport, and pushes the optical element holding member so that the bullport inner wall surface presses the mode of leading axle.
It is desirable to, the optical element holding member comprises from the outstanding projection of contact portion, and is positioned within the hunting range of arm of bias unit, to receive along the bias force of the moving direction of optical element holding member.
It is desirable to, the position of optical element control gear comprises pressurizing unit, when bias unit is in application of force state, and wherein during the engagement of arm and optical element holding member, the direction extruding bias unit that this pressurizing unit edge is vertical with optical element holding member moving direction.
It is desirable to, pressurizing unit comprises the fixed wall parts, is positioned at the inside and outside one of which at least of bias unit.The arm of bias unit contacts with the fixed wall parts, and the edge is extruded with the vertical direction of optical element holding member moving direction.
It is desirable to, the fixed wall parts comprise the outer wall parts, and the outer wall parts are positioned at the outside of the arm of bias unit, and along the direction extruding bias unit near optical axis.
It is desirable to, the fixed wall parts comprise inner wall section, and inner wall section is positioned at the inboard of bias spring, and along the arm that pushes bias unit away from the direction of optical axis.
It is desirable to, the fixed wall parts comprise the extruding projection, and the extruding projection contacts with the arm extruding of bias unit.
It is desirable to, the arm that forms this bias unit is with to fixed wall parts protrusion, thereby the sweep of bias unit is contacted with the fixed wall parts.
It is desirable to, the arm of bias unit comprise extend to towards first extension of the sweep of fixed wall parts and from sweep towards second extension of extending away from the direction of fixed wall.
It is desirable to, the position of optical element control gear comprises the cylindrical parts that is positioned at optical element holding member outside; And be positioned at the outside outer wall parts of optical element holding member, and make its outside surface towards cylindrical parts.Between column type parts and the outer wall parts, the arm of bias unit closely contacted with one of outer wall parts with interior column type parts in bias unit was maintained at, thereby the edge is extruded with the perpendicular direction of optical element holding member moving direction.
It is desirable to, the optical element holding member guides along straight line, and does not rotate on optical axis.
It is desirable to, the position of optical element control gear is bonded in the phtographic lens unit, and support component constitutes the fixed part of phtographic lens unit.
According to according to the invention; Can through simple, save the structure space, that constitute by few components; Eliminate forward/back and move the gap in the guide member; Because bias unit not only at the optical axis direction biasing holding member of optical element, makes holding member move along this direction, simultaneously also at the direction biasing holding member vertical with the holding member moving direction.In addition, be used for the device of vertical direction extruding bias unit of holding member moving direction, can obtain the bigger forward/back that prevents and move the effect in the gap in the guide member in application of force state lower edge through providing for the position of optical element control gear to have.
Description of drawings
Below will describe the present invention with reference to accompanying drawing, wherein:
Fig. 1 is a sectional view of having used the Zoom lens barrel of the mechanism that is used to control position of optical element of the present invention, and Zoom lens barrel is in lens barrel retracted state (retracted state fully) among the figure;
Fig. 2 is the sectional view of Zoom lens barrel that is in the preparation photography state, and wherein the first half of the Zoom lens barrel that provides of Fig. 2 representes to be in wide-angle side and the Zoom lens barrel of dolly-out,ing dolly-back and holding respectively with Lower Half;
Fig. 3 is the front perspective view that is in the Zoom lens barrel of lens barrel retracted state;
Fig. 4 is the Zoom lens barrel rear view that is in the lens barrel retracted state;
Fig. 5 is the front perspective view that is in the Zoom lens barrel of preparation photography state;
Fig. 6 is the rear view that is in the Zoom lens barrel of preparation photography state, and wherein the image pick-up device retainer of Zoom lens barrel is removed;
Fig. 7 is the exploded rear perspective view of Zoom lens barrel, and the element that wherein is associated with the position control of the 3rd lens combination is removed;
Fig. 8 is the front perspective view of the major part of the 3rd lens group frame and position control mechanism thereof;
Fig. 9 is the rear view of the major part of the 3rd lens group frame and position control mechanism thereof;
Figure 10 is the front view of Zoom lens barrel, mainly shows the 3rd lens group frame and position control mechanism thereof;
Figure 11 is the 3rd lens group frame shown in Figure 10 and the front view of position control mechanism thereof;
Figure 12 is the side view of the 3rd lens group frame and position control mechanism thereof, has shown the operation of torsionspring of the position control mechanism of the 3rd lens group frame that is used to setover;
Figure 13 is at the comparison example that has adopted extension spring as the bias unit of the 3rd lens group frame that is used for setovering, the side view of the 3rd lens group frame and position control mechanism thereof;
Figure 14 A and 14B are spring loads change and the contrast charts between the spring loads change in the comparison example shown in Figure 13 in embodiment illustrated in fig. 12; Wherein Figure 14 A has provided the yellow loads change of bullet in embodiment illustrated in fig. 12, and Figure 14 B has provided the spring loads change in the comparison example shown in Figure 13;
Figure 15 is the side view of second embodiment of position of optical element control gear; Be used to control the position of lens-mount, wherein use drive cam axle (lead cam shaft) to replace the screw mechanism that in first embodiment of position of optical element control gear, uses that provides among Fig. 1 to 12;
Figure 16 is the front view of second embodiment of position of optical element control gear shown in Figure 15;
Figure 17 is the front view of the 3rd embodiment of position of optical element control gear, mainly provides the 3rd lens group frame and position control mechanism thereof, and the combination of wherein using lever and torsionspring is as the bias unit of the 3rd lens group frame that is used to setover;
Figure 18 is the 3rd lens group frame shown in Figure 17 and the front view of position control mechanism thereof;
Figure 19 is the side view of the 3rd embodiment of position of optical element control gear, is used for controlling the position of the 3rd lens group frame, has shown the operation of lever and torsionspring;
Figure 20 is the side view of the 4th embodiment of position of optical element control gear, is used for controlling the position of the 3rd lens group frame, and the combination of wherein using lever and extension spring is as the bias unit of the 3rd lens group frame that is used to setover;
Figure 21 is the side view of the 5th embodiment of position of optical element control gear, is used for controlling the position of the 3rd lens group frame, and the combination of wherein using lever and extension spring is as the bias unit of the 3rd lens group frame that is used to setover;
Figure 22 is the skeleton view that improves the image pick-up device retainer of embodiment element as first of position of optical element control gear; Wherein the image pick-up device retainer has crimping section on its protective bulkhead part, is used to push the bias arm part of the 3rd lens combination bias spring;
Figure 23 is the rear view of the part sectioned view of first of a position of optical element control gear part of improving embodiment, and the bias arm part that shows the 3rd lens combination bias spring is by the state of the crimping section extruding of the protective bulkhead of image pick-up device retainer part;
Figure 24 is the rear view of the part sectioned view of second of a position of optical element control gear part of improving embodiment, and the bias arm part that shows the 3rd lens combination bias spring is by the state of the crimping section extruding of the protective bulkhead of image pick-up device retainer part;
Figure 25 is the rear view of the part sectioned view of the 3rd of a position of optical element control gear part of improving embodiment, and the bias arm that shows the 3rd lens combination bias spring is partly gone up the state that the sweep that forms is partly pushed by the protective bulkhead of image pick-up device retainer; And
Figure 26 is the rear view of the part sectioned view of the 4th of a position of optical element control gear part of improving embodiment, shows the bias arm part of the 3rd lens combination bias spring, the crimping section that is formed on the cylindrical part of frame extruding.
Embodiment
At first, below will mainly discuss the one-piece construction of the Zoom lens barrel 1 of having used position of optical element control gear of the present invention to Fig. 7 according to Fig. 1.Fig. 1 and Fig. 2 have provided the sectional view of Zoom lens barrel 1 respectively; Fig. 1 has shown that Zoom lens barrel 1 is in the lens barrel retracted state; In this state, do not take pictures; The first half of sectional view among Fig. 2 shows that Zoom lens barrel 1 is in wide-angle side, and the latter half of the sectional view among Fig. 2 shows that Zoom lens barrel 1 is in the end of dolly-out,ing dolly-back.Fig. 3 and Fig. 4 are the skeleton views that is in the Zoom lens barrel 1 of lens barrel retracted state, and Fig. 5 and Fig. 6 are the skeleton views that is in the Zoom lens barrel 1 of preparation photography state.
Zoom lens barrel 1 has photographic optical system; Photographic optical system is by the order that begins from target side; Comprise the first lens combination LG1, the second lens combination LG2, one group of blade (mechanical shutter; Also as aperture) S, the 3rd lens combination LG3, optical low-pass filter (optical filter) LPF and image pick-up device (imaging sensor) 24, for example CCD or CMOS.This photographic optical system is configured to varifocal optical system.Through according to predetermined move mode, move the first lens combination LG1 and the second lens combination LG2 along the optical axis O of photographic optical system and carry out focal length and change operation (zoom operation), carry out focusing operation through move the 3rd lens combination LG3 along optical axis O.In the following description, the expression of " optical axis direction " comprises the direction parallel with the optical axis O of photographic optical system.
Zoom lens barrel 1 has frame (support component) 22, at the first lens combination LG1 to the of these frame 22 inner support optical systems, three lens combination LG3, moves on optical axis direction to allow these lens combination.Zoom lens barrel 1 has image pick-up device retainer 23, is fixed on the back of frame 22.Center at image pick-up device retainer 23 forms opening, and image pick-up device 24 is fixed in this opening through image pick-up device framework 62.The light filter framework 21 that is fixed on image pick-up device framework 62 the place aheads keeps optical low-pass filter LPF.Being used for dustproof packaging part (seal) 61 remains between optical low-pass filter LPF and the image pick-up device 24 closely.Image pick-up device framework 62 is supported by image pick-up device retainer 23, thereby 23 pairs of image pick-up device frameworks 62 of image pick-up device retainer are made tilt adjustments relatively.
Frame 22 is provided with zoom motor support section 22b, mounting portion 22c of AF mechanism and front wall section 22d around its cylindrical part 22a.Cylindrical part 22a surrounds optical axis O, and zoom motor support section 22b supports zoom motor 32, and the mounting portion 22c of AF mechanism supports AF motor 30, and front wall section 22d is positioned at before the mounting portion 22c of AF mechanism.Cylindrical part 22a supports above-mentioned optical element (for example each is positioned at the lens combination of cylindrical part 22a) and forms the essence outward appearance of Zoom lens barrel 1.Zoom motor support section 22b, the mounting portion 22c of AF mechanism and front wall section 22d radially are positioned at around the outside of the cylindrical part 22a of optical axis O.To shown in Figure 7, the mounting portion 22c of AF mechanism forms near the rear end part of cylindrical part 22a like Fig. 3, and the back surface portion of the mounting portion 22c of AF mechanism is by image pick-up device retainer 23 approaching encirclements.Front wall section 22d is being formed on the frame 22 away from the position of the mounting portion 22c of AF mechanism forward along optical axis direction, towards the mounting portion 22c of AF mechanism.
Zoom lens barrel 1 has the 3rd lens group frame (optical element holding member) 51, is used to keep the 3rd lens combination LG3.The 3rd lens group frame 51 has a pair of lead arm part 51b and 51c, extends out from the center lens retaining part 51a of the 3rd lens group frame 51, and optical axis O becomes anti-radial symmetry basically relatively.Lead arm part 51b has a pair of bullport (along preceding bullport of arranging on the optical axis direction and back bullport) 51d at its radial outside end annex; The 3rd lens combination leading axle (guide member is moved in forward/back) 52 is inserted into wherein, so that can this be free to slide bullport 51d relatively.The front-end and back-end of the 3rd lens combination leading axle 52 are separately fixed on frame 22 and the image pick-up device retainer 23.Shown in Fig. 6 and 10, the 3rd lens combination leading axle 52 is positioned at the outside of the cylindrical part 22a of frame 22, and the fore-end of the 3rd lens combination leading axle 52 is supported by front wall section 22d.The rear end part of the 3rd lens combination leading axle 52 passes through below the mounting portion 22c of AF mechanism, and meshes with the axle supported hole that is formed in the image pick-up device retainer 23.In order to be guided by the 3rd lens combination leading axle 52; Form the lead arm part 51b of the 3rd lens group frame 51; Make near the part of lead arm part 51b its radial outside end outwards protrude from the cylindrical part 22a of frame 22; And cylindrical part 22a has opening 22e (see figure 7), allows lead arm part 51b outwards to protrude from cylindrical part 22a.The 3rd lens group frame 51 has the anti-projection 51e that rotates at the radial outer end of another lead arm part 51c; Frame 22 circumferential surface within it has the straight line guiding groove 22f that extends along optical axis direction, and the anti-projection 51e that rotates is engaged on wherein can freely sliding.The axle of the 3rd lens combination leading axle 52 and straight line guiding groove 22f's is vertically parallel with optical axis O; The 3rd lens group frame 51 by guiding point-blank, can move on the edge it on the direction parallel with optical axis O with the identical direction of the anti-projection 51e of rotation with the bullport 51d that is guided respectively by the 3rd lens combination leading axle 52 and straight line guiding groove 22f.In addition, the 3rd lens group frame 51 can move before optical axis O direction and backward through AF motor 30.The driving mechanism of the 3rd lens group frame 51 will be discussed in the back.
Zoom lens barrel 1 has the reduction gearing chain in the zoom motor support section 22b inside of frame 22, is used for the driving force of zoom motor 32 is passed to zoom gear 31 (seeing Fig. 6 and 7).Be supported on the inner cam ring 11 of cylindrical part 22a of frame 22, have annular wheel 11a in its back-end with zoom gear 31 engagements.Cam ring 11 drives rotation through the engagement of annular wheel 11a and zoom gear 31 by zoom motor 32.Cam ring 11 has guide protrusion 11b on annular wheel 11a, frame 22 has cam ring control flume 22g on the inner circumferential surface of cylindrical part 22a, and guide protrusion 11b slidably mates respectively in cam ring control flume 22g.Each cam ring control flume 22g partly is made up of guiding groove part and circumferential groove, wherein guiding groove part optical axis O direction inclination relatively, and the circumferential groove part is made up of separately the circumferential parts around optical axis O.When Zoom lens barrel 1 is between the wide-angle side state shown in withdrawal shown in Figure 1 (retraction fully) state and Fig. 2 the first half; Through applying moment of torsion to cam ring 11 by zoom motor 32; Make cam ring 11 when rotating, move along optical axis direction, wherein guide protrusion 11b is partly guided by the guiding groove of above-mentioned cam ring control flume 22g respectively.More clearly, when Zoom lens barrel 1 when the lens barrel retracted state gets into wide-angle side state (preparation photography state), cam ring 11 when rotating along optical axis direction advance (head for target side).On the contrary, when Zoom lens barrel 1 when wide-angle side state (preparation photography state) gets into the lens barrel retracted state, cam ring 11 bounces back along optical axis direction when rotating.On the other hand; When Zoom lens barrel 1 is in the wide-angle side state and dolly-out,s dolly-back preparation photography state (in zooming range) between the end state; The guide protrusion 11b of cam ring 11 is positioned within the circumferential groove part of front said cam ring control flume 22g; Thereby cam ring 11 rotates on the fixed position of optical axis direction, does not just move along optical axis direction.
Zoom lens barrel 1 has the first propelling mirror lens barrel 13 and straight line guided rings 10 that is supported on cylindrical part 22a inside in the inside of the cylindrical part 22a of frame 22, and cam ring 11 advances between lens barrel 13 and the straight line guided rings 10 first.Through advancing the radially outwards outstanding straight line guide protrusion 13a of lens barrel 13 respectively and the engagement between the straight line guiding groove 22h that the inner circumferential surface of cylindrical part 22a forms from first; Advance lens barrel 13 to guide point-blank to first along optical axis direction; Through respectively and the engagement between the straight line guiding groove 22i that the inner circumferential surface of cylindrical part 22a forms, straight line guided rings 10 is guided along optical axis direction point-blank from the radially outwards outstanding straight line guide protrusion 10a of straight line guided rings 10.First advance lens barrel 13 and straight line guided rings 10 each all with cam ring 11 couplings, thereby cam ring 11 rotations and move along optical axis direction relatively with cam ring 11.
Through being positioned at the straight line guiding bolt 10b (see figure 2) of the inner straight line guided rings 10 of cam ring 11, straight line guided rings 10 guides the second lens combination travelling frame 8 point-blank at optical axis direction.Zoom lens barrel 1 provides second lens holding frame 6 in the inside of the second lens combination travelling frame 8, in order to keep the second lens combination LG2.Second lens holding frame 6 and the second lens combination travelling frame 8 constitute whole.In addition; First advances lens barrel 13 to provide along being parallel to the straight line guiding groove 13b that optical axis O direction is extended on the circumferential surface within it; Second advances lens barrel 12 to have radially outwards outstanding straight line guide protrusion 12a; Straight line guide protrusion 12a slidably mates in straight line guiding groove 13b, therefore second advances lens barrel 12 also to be guided point-blank along optical axis direction.Zoom lens barrel 1 advances second provides first lens combination to keep framework 4 in the lens barrel 12, in order to keep the first lens combination LG1.
Cam ring 11 provides second lens combination control cam path 11c on the circumferential surface within it; The second lens combination travelling frame 8 provides cam follower 8a at its external peripheral surface; In order to the mobile second lens combination LG2, and slidably mate respectively in second lens combination control cam path 11c.Because the second lens combination travelling frame 8 is guided along optical axis direction through straight line guided rings 10 point-blank; The rotation of cam ring 11 causes the profile of the second lens combination travelling frame 8 (the second lens combination LG2) according to second lens combination control cam path 11c, moves along optical axis direction by the predetermined movement mode.
Second advances lens barrel 12 to have radially inwardly outstanding cam follower 12b, and in order to move the first lens combination LG1, cam ring 11 provides first lens combination control cam path 11d at its external peripheral surface, and cam follower 12b slidably mates therein respectively.Because second advances lens barrel 12 to advance lens barrel 13 in the guiding point-blank of optical axis direction quilt through first; The rotation of cam ring 11 causes second to advance the profile of lens barrel 12 (the first lens combination LG1) according to first lens combination control cam path 11d, moves along optical axis direction by predetermined move mode.
The second lens combination travelling frame 8 and second advances lens barrel 12 to be setovered along opposite direction away from each other by bias spring between lens combination 27; Control the accuracy of mesh between the cam path 11c thereby improve each cam follower 8a with the second relevant lens, and each cam follower 12b controls the accuracy of mesh between the cam path 11d with the first relevant lens combination.
Zoom lens barrel 1 provides shutter unit 15 in the second lens combination travelling frame 8, comprise one group of blade S that is supported by the second lens combination travelling frame 8.Zoom lens barrel 1 provides rear-mounted limiting part 5 in the second lens combination travelling frame, 8 back; The second lens combination travelling frame 8 has guide protrusion 8b and guide protrusion 5a with rear-mounted limiting part 5, as outstanding a pair of projection on the direction towards each other that is parallel to optical axis O direction on the edge.Shutter unit 15 is supported by two guide protrusion 8b and 5a, so that can slide along optical axis direction above that.
Decorative panel 16 with photography hole 16a is fixed on the front end of the second propelling lens barrel 12; Zoom lens barrel 1 and one group of grill-protected sheet 17 be immediately following in the back of decorative panel 16, and wherein the grill-protected sheet is used for opening and closing the photography hole 16a that is positioned at before the first lens combination LG1.
Below discussion is had the operation of the Zoom lens barrel 1 of above structure.Under Fig. 1, the lens barrel retracted state shown in 3 and 4, optical system is lacked than its length under Fig. 2, the preparation photography state shown in 5 and 6 along the length of optical axis direction (distance from the front surface (target side surface) of the first lens combination LG1 to the imaging surface of image pick-up device 24).At the lens barrel retracted state; When traditional state transformation signal that transforms to the preparation photography state from the lens barrel retracted state (for example; Opening installation the main switch of camera of Zoom lens barrel 1) when being unlocked, zoom motor 32 is driven along the lens barrel working direction.This makes zoom gear 31 rotate, and therefore causes cam ring 11 to move forward along optical axis direction, rotates with the guide protrusion 11b that is partly guided by the guiding groove of cam ring control flume 22g respectively simultaneously.Straight line guided rings 10 and first advances lens barrel 13 to move forward point-blank with cam ring 11.Through the engagement between cam follower 8a and second lens combination control cam path 11c, the rotation of cam ring 11 causes the second lens combination travelling frame 8 to move along optical axis direction by the predetermined movement mode.In addition; Through the engagement between cam follower 12b and first lens combination control cam path 11d; The rotation of cam ring 11 causes second to advance lens barrel 12 to move along optical axis direction by the predetermined movement mode, wherein second advances lens barrel 12 to advance lens barrel 13 along the guiding point-blank of optical axis direction quilt through first.
Promptly; The amount that the first lens combination LG1 pushes ahead from the lens barrel retracted state; The amount sum decision that the amount and second that is moved forward with respect to frame 22 by cam ring 11 advances lens barrel 12 to push ahead with respect to cam ring 11; And the amount that the second lens combination LG2 pushes ahead from the lens barrel retracted state, the amount sum decision that the amount that is moved forward with respect to frame 22 by cam ring 11 and the second lens combination travelling frame 8 are pushed ahead with respect to cam ring 11.Through on optical axis O, moving the first lens combination LG1 and the second lens combination LG2, the air distance that changes simultaneously between the first lens combination LG1 and the second lens combination LG2 is carried out zoom operation.On the lens barrel direction of propulsion, drive zoom motor 32; Thereby Zoom lens barrel is advanced from lens barrel retracted state shown in Figure 1; At first cause Zoom lens barrel 1 to move to the wide-angle side shown in the first half of Fig. 2 sectional view; Further drive zoom motor 32 then, cause Zoom lens barrel 1 to move to the end of dolly-out,ing dolly-back shown in the latter half of Fig. 2 sectional view along same direction.In the zooming range of dolly-out,ing dolly-back between end and the wide-angle side; When guide protrusion 11b is engaged within the cam ring control flume 22g of frame 22 respectively; 11 of cam rings are carried out the operation of said fixing rotated position, therefore neither move forward at optical axis direction and also do not move backward.When main switch is closed; Zoom motor 32 is driven along the lens barrel retraction direction; Make Zoom lens barrel 1 carry out the lens barrel retraction operation opposite, so Zoom lens barrel 1 turn back to lens barrel retracted state shown in Figure 1 with said lens lens barrel forward operation.
When Zoom lens barrel 1 was in preparation photography state shown in Figure 2, this group blade S was positioned at second lens combination LG2 back.When Zoom lens barrel 1 moves to lens barrel retracted state shown in Figure 1 from preparing photography state; Shutter unit 15 is in the second lens combination travelling frame 8; The relative second lens combination travelling frame 8 moves forward along optical axis direction, thereby the part of the second lens combination LG2 is in the plane vertical with optical axis O with this group blade S.In addition, when Zoom lens barrel 1 was in the lens barrel retracted state, this group grill-protected sheet 17 was closed.This group grill-protected sheet 17 is opened when the forward operation of Zoom lens barrel 1, and wherein Zoom lens barrel 1 gets into the preparation photography state.
Support the 3rd lens group frame 51 of the 3rd lens combination LG3 and can pass through AF motor 30, move forward and backward, be independent of above-mentioned by first lens combination LG1 of zoom motor 32 execution and the driving operations of the second lens combination LG2 along optical axis direction.In addition; When Zoom lens barrel 1 is in the preparation photography state; The position is from when wide-angle side is to any focal length of the end of dolly-out,ing dolly-back; The 3rd lens group frame 51 that supports the 3rd lens combination LG3 moves along optical axis direction, according to the target range information that is obtained by the distance measuring equipment (not providing) that provides in the camera that Zoom lens barrel 1 for example has been installed, carries out focusing operations through driving AF motor 30.
Below discussion is used to control the details of the position control mechanism mechanism of the 3rd lens group frame 51 positions.As stated, on frame 22, form the AF mounting portion 22c of mechanism, be located at the outside of cylindrical part 22a, and on frame, form front wall section 22d, it is also relative with it before to be located at the mounting portion 22c of AF mechanism.AF motor 30 is fixed on through fixed screw 33 before the mounting portion 22c of AF mechanism, therefore be fixed on pinion wheel 30a on the turning axle of AF motor 30 from the back surface of the mounting portion 22c of AF mechanism outstanding backward (see figure 6).Be supported on the back surface of the mounting portion 22c of AF mechanism rotationally with the neutral gear 34 of pinion wheel 30a engagement with the driven wheel 35 of neutral gear 34 engagements.Driven wheel 35 is fixed on the rear end of screw (screw shaft) 36.The rotation of the turning axle of AF motor 30 is transmitted to screw 36 through pinion wheel 30a, neutral gear 34 and the driven wheel 35 of the reduction gearing chain of formation AF driving mechanism.The front-end and back-end of screw 36 are separately fixed in front-axle hole and the back axis hole among the front wall section 22d of frame 22; Image pick-up device retainer 23 is supported rotationally thus, so screw 36 can freely be rotated on basic parallel with optical axis O rotation axis.
The 3rd lens group frame 51 provides nut butted part 51f at the radial outer end of lead arm part 51b.Passing nut butted part 51f forms in order to insert the through hole of screw 36.Before the AF nut 37 of 36 one-tenth screw engages of screw is installed in nut butted part 51f.Through the engagement between the anti-rotation projection 51g (referring to Fig. 8) of recessed 37a (see figure 7) of the anti-rotation of AF nut 37 and the 3rd lens group frame 51; And the engagement between the anti-rotation recessed (not providing) that forms in the anti-rotation projection 37b of AF nut 37 and the frame 22, prevented that AF nut 37 from rotating.With the screw 36 that rotates backward, cause the AF nut 37 edges direction parallel to move forward and backward forward, and do not rotate with screw 36 with optical axis O.The 3rd lens group frame 51 provides vertical wall segments (contact portion) 51k that forms with the flat shape that is parallel to optical axis O basically near the radial outer end of the lead arm part 51b between a pair of bullport 51d.The 3rd lens group frame 51 also provides carbine 51h on vertical wall segments 51k, this carbine 51h is laterally outstanding from vertical wall segments 51k.Carbine 51h becomes L shaped projection, and its bending makes front end edge optical axis side backwards.The back of the carbine 51h of the 3rd lens group frame 51 on the side of vertical wall segments 51k provides the part 51m of semi-circular cross-section.
In Zoom lens barrel 1, provide torsionspring 38 as bias unit, along the direction that the 3rd lens group frame 51 is moved along optical axis O, be that the 3rd lens group frame 51 provides bias force.Torsionspring 38 has coiling part 38a.Coiling part 38a is supported by the spring supporting projections 22j that is formed on the frame 22.Spring supporting projections 22j is a cylindrical projections, is formed at the outside surface of cylindrical part 22a, and extend with the vertical basically direction of the vertical plane P1 that is parallel to optical axis O (see Figure 10, vertical plane P1 comprises optical axis O) on the axle edge of spring supporting projections 22j.The coiling part 38a of torsionspring 38 remains on the cylindrical outer surface of spring supporting projections 22j, and through tightening fixed screw 39 in the screw that in passing spring supporting projections 22j, is formed centrally, avoids coiling part 38a and come off from spring supporting projections 22j.The central shaft that remains on the coiling part 38a on the spring supporting projections 22j is consistent with the central shaft of spring supporting projections 22j basically.
Torsionspring 38 has short support arm portion (second arm portion) 38b and long bias arm part (arm/the first arm part) 38c, and each is all radially outwards outstanding from coiling part 38a.Short support arm portion 38b is hooked in carbine (projection) 22k last (seeing Figure 12), and wherein carbine 22k is formed on the frame 22, is positioned near the spring supporting projections 22j.On the other hand, the free end of bias arm part 38c is hooked on the carbine 51h of the 3rd lens group frame 51.The vertical wall segments 51k of the 3rd lens combination 51 and semi-circular cross-section part 51m also have when making bias arm part 38c and carbine 51h engagement, prevent the function that bias arm part 38c contacts with near any part except that carbine 51h.Bias arm part 38c can swing (just, can in the swinging plane substantially parallel with vertical plane P1, swing) around the axis of swing 38x (fulcrum) with the axle basically identical that coils part 38a as the force part that can swing.In other words, bias arm part 38c can be around swinging with the vertical basically axis of swing 38x of optical axis O.
When being in free state, when promptly bias arm part 38c was not hooked on the carbine 51h, the coiling part 38c of the relative Figure 12 of bias arm part 38c extended vertically downward, shown in the double dot dash line part of Reference numeral 38c (F) mark among Figure 12.From then on state; 38c (F) among the relative Figure 12 of bias arm part 38c is rotated counterclockwise roughly half-turn; And with bias arm part 38c at its free-ended hook segment along on the back surface of the carbine 51h of optical axis direction; The elastic deformation of torsionspring 38 (distortion) amount increases, and the elastic force of torsionspring 38 is as being carried in the load on the carbine 51h, makes bias arm part 38c along optical axis direction extrusion spring hook 51h forward.Just, torsionspring 38 gets into application of force state, and wherein torsionspring 38 imposes on the 3rd lens group frame 51 along optical axis direction bias force forward through bias arm part 38c.
So, impose the 3rd lens group frame 51 of bias force forward along optical axis direction,, prevented to move forward through docking of nut butted part 51f and AF nut 37 by curved spring 38.That is to say that like Fig. 8, shown in 9 and 12, the 3rd lens group frame 51 keeps through the nut butted part 51f that is contacted with AF nut 37 by the bias force of torsionspring 38, the 3rd position of lens group frame 51 on optical axis direction is by 37 decisions of AF nut.Since through forward with rotate backward the pinion wheel 30a of AF motor 30; AF nut 37 moves forward and backward along being parallel to optical axis O direction through screw 36, and the 3rd position of lens group frame 51 on optical axis direction is by the driving direction and the drive amount control of AF motor 30.For example, if AF nut 37 is moved forward by AF motor 30, the 3rd lens group frame 51 is followed this AF nut 37 and is moved forward through the bias force of torsionspring 38, and amount of movement is the amount that AF nut 37 moves forward.Otherwise if move backward the position after AF nut 37 moves forward from it, AF nut 37 pushes nut butted part 51f backward, thereby the 3rd lens group frame 51 is mobile backward against the bias force of torsionspring 38.
Origin position sensor 40 is installed in the frame 22, is used for surveying the boundary that the 3rd lens group frame 51 that moved by AF motor 30 moves at optical axis direction backward.Origin position sensor 40 is made up of photo interrupter; Comprising U-shaped cross section main body; Be provided with optical transmitting set that faces with each other and optical receiver on it with preset space length; When and the integrally formed sensors blocking-up of the 3rd lens group frame 51 plate 51i when clamp-oning between optical transmitting set and the optical receiver, can detect the 3rd lens group frame 51 and be positioned at the boundary that it moves backward.AF motor 30 is step motor.The amount that the 3rd lens combination LG3 moves when carrying out focusing operation is calculated as the step number that is used to drive AF motor 30 with the boundary that moves backward as initial point.
The 3rd lens group frame 51, is provided by solid line in Figure 12 by the boundary that moves backward in the moving range of AF motor 30 controls at it, and the boundary that the 3rd lens group frame 51 moves forward in its identical moving range is provided by double dot dash line in Figure 12.Figure 14 A has provided according to the loads change of the 3rd lens combination 51 at the torsionspring 38 of the change in location of optical axis direction.When the 3rd lens combination 51 is positioned at the boundary that moves backward; The pivot angle angle of the position of the bias arm part 38c of torsionspring 38 when relatively it is in free state is represented by θ max; When the 3rd lens combination 51 was positioned at the boundary that moves forward, the pivot angle angle of the position of the bias arm part 38c of torsionspring 38 when relatively it is in free state was represented (seeing Figure 12) by θ min.In addition, represent by Fmin and Fmax respectively with the load of pivot angle θ min and the corresponding torsionspring 38 of θ max.Shown in figure 12; When torsionspring 38 was in aforesaid application of force state, the angular displacement θ v between minimum swash angle θ min and the maximum pendulum angle θ max was much littler to the minimum swash angle θ min that torsionspring 38 gets into application of force states from the free state of torsionspring 38 than scope.Therefore, in the moving range of the 3rd lens group frame 51, it is minimum that the variation from minimum load Fmin to maximum load Fmax can reduce to.
Figure 13 has provided comparison example, and wherein torsionspring 38 is by being parallel to extension spring 38 ' replacement that optical axis O direction is extended and shortened.Extension spring 38 ' an end hook on the carbine 51h ' of the 3rd lens group frame 51 ' (being equivalent to the 3rd lens group frame 51), extension spring 38 ' the other end be hooked on the carbine 22j ' of frame 22 ' (being equivalent to frame 22).The 3rd lens group frame 51 ' can move forward and backward along the 3rd lens combination leading axle 52 ' (being equivalent to the 3rd lens combination leading axle 52) at optical axis direction; The 3rd lens group frame 51 ' in its moving range by AF motor 30 ' (being equivalent to AF motor 30) control, the boundary that moves is backward represented by solid line and double dot dash line respectively with the boundary that moves forward.In addition; In Figure 13, with frame 22 ' carbine 22j ' position engaged be the reference position, when the 3rd lens group frame 51 is in its boundary that moves forward; Extension spring 38 ' length be designated as Lmin; And with frame 22 ' carbine 22j ' position engaged be the reference position, when the 3rd lens group frame 51 is in its boundary that moves backward, extension spring 38 ' length be designated as Lmax.Because the carbine 22j ' of stationkeeping is positioned at the front of position of optical element control gear, therefore when the 3rd lens group frame 51 ' when being positioned at its mobile backward boundary, extension spring 38 ' become and grow (Lmax) most.Lf shown in Figure 13 has pointed out the length of extension spring 38 ' when being in free state.
Figure 14 B has provided in the comparative examples shown in Figure 13, extension spring 38 ' loads change.Spring load when the Fmin ' expression extension spring 38 ' length among Figure 14 B is Lmin, the spring load when Fmax ' the expression extension spring 38 ' length among Figure 14 B is Lmax.Can know from Figure 13; Minimum length Lmin and maximum length Lmax (be in application of force state, wherein extension spring 38 ' along optical axis direction bias force forward impose on the 3rd lens group frame 51 ') between displacement Lv2 than much bigger to the displacement Lv1 of extension spring 38 ' entering application of force state from length L f (extension spring 38 ' when being in free state length).Because extension spring 38 ' capacity value and extension spring 38 ' the variation that is directly proportional of length variations amount; Therefore extension spring 38 ' in, the difference between the load Fmax ' of the load Fmin ' of extension spring 38 ' when being positioned at minimum length Lmin and extension spring 38 ' when being positioned at maximum length Lmax becomes very big.In addition, for satisfying maximum load Fmax ', AF motor 30 ' be required to be large capacity motor.
In order to reduce load change, just reduce the length difference of extension spring 38 ' between maximum length Lmax and minimum length Lmin, can imagine, be employed in extension spring that free state has longer length as extension spring 38 '.Yet, if adopt so long extension spring as extension spring 38 ', correspondingly need bigger space, the demand of this and Zoom lens barrel miniaturization is disagreed.Except that extension spring 38 ', the structure of comparison example that Figure 13 provides and embodiment shown in Figure 12 is basic identical.If adopt the longer extension spring of length as extension spring 38 ', carbine 22j ' must be in the position (position that is equivalent to frame 22 ' front end basically) of the Zoom lens barrel front end that is in retracted state (right-hand side among Figure 13) before.That is to say, adopt the longer extension spring of length as extension spring 38 ', cause Zoom lens barrel to increase in the length of retracted state.In this case; Extension spring 38 in the comparison example shown in Figure 13 ' be given the structurally possible maximum length of Zoom lens barrel; Therefore; Keeping Zoom lens barrel under the situation of the current size retracted state under, be difficult to loads change is reduced to than the littler degree shown in Figure 14 B, so can not satisfy the requirement of Zoom lens barrel miniaturization simultaneously and reduce the requirement of load change.
If the 3rd lens group frame 51 ' moving range reduce (if the 3rd lens group frame 51 ' the boundary that moves backward be set at before the solid line shown in Figure 13); Just can reduce extension spring 38 ' peak load, and need not to increase the length of extension spring 38 ' under free state; Yet, reduce like this 3rd lens group frame 51 ' moving range, limited the moving range of the 3rd lens combination LG3 inevitably, thereby possibly can't obtain necessary optical property.Therefore, reduce the 3rd lens group frame 51 ' moving range be unpractiaca.
Although used in the comparison example shown in Figure 13 extension spring 38 ', even if replace extension spring 38 ' also can produce identical problem with compression spring.That is to say; The 3rd lens group frame 51 no matter be used to setover ' spring members be extension spring or compression spring; All be difficult in the Zoom lens barrel miniaturization and reduce to be between the loads change of spring members of certain bias structure obtain balance, wherein along the 3rd lens group frame 51 ' the forward/back moving direction stretch and the spring members that shrinks directly be connected the 3rd lens group frame 51 ' and fixed part (frame 22 ') between.
Opposite; In the embodiment of above-mentioned position of optical element control gear; Wherein use torsionspring 38 bias unit as the 3rd lens group frame 51 that is used for setovering, though torsionspring 38 is mounted in the bias unit in the identical installing space of size in the comparison example, the loads change comparison of torsionspring 38 is much littler than the loads change in the instance; The peak load of spring is also compared littler than the peak load in the example, can understand through the contrast between the chart among Figure 14 A and the 14B.Therefore, drive the 3rd lens group frame 51 required energy be averaged in to low-level, thereby can reduce the power consumption of AF motor 30.In other words, can adopt energy-saving AF motor as AF motor 30.In addition, because little with the mobile corresponding loads change of the 3rd lens group frame 51, the 3rd lens group frame 51 can be driven in its whole movings range reposefully; In addition, with driving force when AF motor 30 is transmitted to the 3rd lens group frame 51, in the driving mechanism noise can not appear easily.
As stated; In torsionspring 38; The boundary and moving backward under the application of force state between the boundary of moving forward in the 3rd lens group frame 51; (θ is that 38 to get into the minimum wobble angle (θ min) of bias arm part 38c of application of force states littler from its free state to torsionspring than scope v) to bias arm part 38c angular displacement, and the expression formula that satisfies condition " θ v/ θ min < 1 ", and this makes that loads change minimizes under the application of force state.In the embodiment shown in fig. 12; Although the angle θ min of minimum swash angle is set near half-turn; But through increasing value as the minimum swash angle θ min of denominator in the above-mentioned conditional expression; Be in the bias arm part 38c of application of force state active section angular displacement (θ v) can be quite little (and owing to maximum pendulum angle θ max along with the increase of minimum swash angle θ min increases; Therefore angular displacement θ v is a constant), this makes it possible to further to reduce poor between peak load and the minimum load of torsionspring 38.Although, suppressed loads change significantly through the expression formula that satisfies condition " /> θ v θ min < 1 ", if the expression formula that satisfies condition " /> θ v θ min 0.5 ", can obtain better effect.As the practical technique that increases minimum swash angle θ min value, can with bias arm part 38c turn round around coiling part 38a (around balance staff 38x) from the free state of bias arm part 38c three-sixth turn or much more more after, be hooked on the carbine 51h.Because even if torsionspring 38 increases around coiling part 38a (axis of swing 38x) elastic type variable in rotational direction; Torsionspring 38 also changes size hardly; The space that torsionspring 38 therefore is installed need not increase, and is different from the situation in the above-mentioned comparison example that has adopted length is longer under free state extension spring or compression spring.If under the identical condition of the steel wire thickness of spring; If the amount of elastic deformation of torsionspring 38 (its scope is 38 entering application of force states from its free state to torsionspring) increases; Then the load of torsionspring 38 increases fifty-fifty, thus the elastic type variable of torsionspring 38 be set at its peak load can very large scope in.
In addition, making one of minimized parameter of load variable of torsionspring 38, is the length from the point of application (working point) of bias arm part 38c on the coiling part 38a to the of its swing three lens group frame 51 of bias arm part 38c.The length of bias arm part 38 from axis of swing 38x to the point of application is long more; The radius of gyration that is near the swing part of torsionspring 38 its free end is big more; Then (θ is v) more little, thereby can suppress the variation of spring load for the angle of slip of corresponding the 3rd lens group frame 51 every displacement units of bias arm part 38c.Suppose that axis of swing 38x with torsionspring 38 is substantially parallel and comprise the surface level P2 of optical axis O, the carbine 51h that then bias arm part 38c is hooked on the 3rd lens group frame 51 is positioned at the zone on the surface level P2, and is shown in figure 10.On the other hand, support is positioned at the zone under the surface level P2 as the spring supporting projections 22j of the frame 22 of the coiling part 38a of the axis of swing of torsionspring 38.Therefore, the bias arm part 38c of torsionspring 38 extends along the vertical direction of passing surface level P2.Because torsionspring 38 radially is installed in the outside as the cam ring 11 of rotatable components in the Zoom lens barrel 1; Therefore can give bias arm part 38c so length, and bias arm part 38c can not hinder and the first lens combination LG1 or the relevant any movable part of the second lens combination LG2 that are driven by cam ring 11.
In addition, consider the shape of the front projection view of Zoom lens barrel 1,, be installed in the Zoom lens barrel 1 with the mode of saving the space in order to control the position control mechanism that comprises torsionspring 38 of the 3rd lens group frame 51.Shown in figure 10; The element of Zoom lens barrel 1, for example the 3rd lens combination leading axle 52 (element of the guide of the 3rd lens group frame 51), AF nut 37, AF motor 30 and screw 36 (element of the driving mechanism of the 3rd lens group frame 51) be installed in be formed on the surface level P2 along in the leg-of-mutton basically space of the external peripheral surface of the cylindrical part 22a of frame 22.The coiling part 38a of torsionspring 38 is supported on another and is formed in the leg-of-mutton basically space under the surface level P2, wherein these two be respectively formed on the surface level P2 with under leg-of-mutton basically space P2 substantial symmetry with respect to the horizontal plane.Although the shape of the preceding Design view of optical devices (camera of Zoom lens barrel 1 for example has been installed) usually based on rectangle (for example; Has the rectangle frame); Such structure can be effectively with the position control mechanism that is used for controlling the 3rd lens combination frame 51, is contained in the quiet space that forms between the peripheral surface of rectangle rack section and cylindrical frame part 22a of camera.In addition; Shown in figure 10; The bias arm part 38c of torsionspring 38 next-door neighbour cylindrical part 22a extends, the tangent triangle space of mode above following triangle space extends to of peripheral surface of and cylindrical part 22a basic with the bias arm part 38c of torsionspring 38.Therefore, torsionspring 38 is in the installation of cylindrical part 22a outside, and is very little to the transverse width influence of Zoom lens barrel 1.
As stated; In the foregoing description of position of optical element control gear; Mechanism through torsionspring 38 biasings the 3rd lens group frame 51 can reduce the load on the AF motor 30; Thereby reduce the power consumption of AF motor 30, turn contribution into for Zoom lens barrel 1 is small-sized simultaneously, particularly reduce the length of Zoom lens barrel 1 under retracted state.
Below will discuss second embodiment of position of optical element control gear according to the invention with reference to Figure 15 and 16.In first embodiment of position of optical element control gear, moving by screw 36 and AF nut 37 of the 3rd lens group frame 51 controlled.Yet, in second embodiment of position of optical element control gear, adopt drive cam axle 136 to replace screw, as the element of the driving mechanism that drives the lens-mount (optical element holding member) 151 that keeps lens combination LG.Lens-mount 151 is directed axle (guide member is moved in forward/back) 152 and guides point-blank with optical axis O parallel direction on anti-rotation axis 153 edges with the extension of optical axis O parallel direction.Leading axle 152 is slidably inserted into the bullport of the cylindrical part 151a formation of passing lens-mount 151; Anti-rotation axis 153 is engaged among the anti-rotation slot 151d on lens-mount 151 parts of an opposite side with cylindrical part 151a that is formed on lens-mount 151 slidably; Wherein, anti-rotation slot 151d and cylindrical part 151a are symmetrical basically with respect to optical axis O.Directing pin 151b is outstanding from cylindrical part 151a, by leading axle 152 guiding.Directing pin 151b is engaged among the guiding groove 136a on the external peripheral surface that is formed on drive cam axle 136.Guiding groove 136a comprises the guiding surface of a pair of axial opposed, tilts with respect to optical axis O direction, and has carried out in advance removing with this between to the guiding surface of axial opposed at directing pin 151b, makes directing pin 151b to slide above that.Drive cam axle 136 has gear 135 at the one of which end.Motor 130 applies moment of torsion through 135 pairs of drive cam axles 136 of gear, makes drive cam axle 136 rotate around the rotation axis that is parallel to optical axis O.Therefore, directing pin 151b is directed when on the guiding surface of a pair of axial opposed of guiding groove 136a, sliding, and makes lens-mount 151 move at optical axis direction.
Torsionspring (bias unit) 138 is supported by the external peripheral surface of helical spring supporting projections 122j, and the coiling part 138a of torsionspring 138 is fixed on the spring supporting projections 122j, and the axle of coiling part 138a extends along the direction perpendicular to optical axis O.The position of spring supporting projections 122j is fixed.Torsionspring 138 comprises support arm portion (second arm portion) 138b and bias arm part (arm/the first arm part) 138c; The two is all radially outwards outstanding from coiling part 138a; And support arm portion 138b and fixing projection 122k engagement, and carbine (projection) 151c of the free end of bias arm part 138c and lens-mount 151 engagement.In this spring engagement; The bias arm part 138c of torsionspring 138 can be around vertical basically with optical axis O; And with the axis of swing 138x swing of the axle basically identical of the coiling part 138a that is supported by spring support section 122j, and along optical axis direction (among Figure 15 towards left to) biasing lens-mount 151 forward.This bias force causes directing pin 151b extruding to lean against among of guiding surface of a pair of axial opposed of guiding groove 136a, is one more forward on optical axis direction, thereby eliminates the gap between directing pin 151b and the guiding groove 136a.Because carbine 151c is formed on the basic center of cylindrical part 151a on it is vertical; Therefore when carbine 151c receives the load of torsionspring 138; Be not easy on cylindrical part 151a, to produce the heeling moment that cylindrical part 151a is tilted with respect to leading axle 152, this has guaranteed level and smooth move of lens-mount 151 on optical axis direction.
According to torsionspring 138; According to first embodiment in torsionspring 38 similar modes; When through motor 130 and drive cam axle 136 along optical axis direction forward and backward during mobile lens framework 151, can reduce in the variation of application of force state lower spring load and can reduce the load on the motor 130.In addition; Similar with the position control mechanism that comprises torsionspring 38 of the position of the 3rd lens group frame 51 that is used to control, when torsionspring 138 when free state is brought into application of force state, even if the amount of spin of bias arm 138c changes; The space that is used to install torsionspring 138 does not increase yet; Therefore, be used to control the position control mechanism that comprises torsionspring 138 of lens-mount 151 positions, installed with the mode of saving the space.In addition; Can know from second embodiment shown in Figure 15 and 16; The application of bias unit on the optical element holding member among the present invention; Be not limited to the directly related application of the driving operations with the forward/back moving-member among first embodiment, bias unit also can be used to eliminate the gap, just as torsionspring 138.As the driving mechanism that is used to drive holding member (for example lens-mount 151), the present invention is not only limited to the ad hoc structure of the combination of employing groove and the projection of above-mentioned use as the combination of guiding groove 136 and directing pin 151b; For example, can take to use face cam (edge cam) or similar structure.In brief, if driving mechanism is requirement eliminate guiding surface with and and the driven member of guiding surface sliding contact between the type in gap, the present invention is extensively suitable.
Among above-mentioned first embodiment; The torsionspring 38 that is made up of independent torsionspring is to be used to setover the bias unit of the 3rd lens group frame 51; In above-mentioned second embodiment, the torsionspring 138 that is made up of independent torsionspring is to be used to setover the bias unit of lens-mount 151.Yet; If bias unit satisfies bias unit through can be around the force part (arm) of axis of swing (vertical basically with the optical axis of the optical element that is kept by the optical element holding member) swing optical element holding member (51 or 151) being applied the requirement of bias force, then bias unit is not limited to so independent torsionspring.
Below will discuss the 3rd to the 5th embodiment of the position of optical element control gear that adopts different bias units with reference to Figure 17 to 21.Each embodiment that will discuss below is except that bias unit and dependency structure thereof, and with the structural similarity of first embodiment, the element similar with first embodiment of position of optical element control gear represented with identical Reference numeral, and gives identical name of parts.
At Figure 17 in the 3rd embodiment shown in Figure 19, bias unit the constituting of the 3rd lens group frame 51 that is used to setover by swing arm (arm/bar) 70 and torsionspring (bar bias component) 238.Frame 22 has swing and supports protrusion 22m; From frame 22 laterally projecting (making the axle edge of swing supporting projections 22m extend) with the vertical basically direction of vertical plane P1; Swing arm 70 has axis hole 70a at the one of which end; Swing supporting projections 22m inserts wherein, makes swing arm 70 freely to rotate around swing supporting projections 22m, and can be around basic vertical with optical axis O and swing with the axis of swing 70x (fulcrum) of a basically identical of swinging supporting projections 22m.The other end of swing arm 70 (free end) and the bar engagement projections 51j engagement that on the 3rd lens group frame 51, forms.The coiling part 238a of torsionspring 238 is installed on the swing supporting projections 22m, and the peripheral surface of being swung supporting projections 22m supports.According to Figure 19; Support arm portion 238b and bias arm part 238c are hooked on respectively on the fixed projection 22n and the part of swing arm 70 near swing supporting projections 22m of frame 22; Torsionspring 238 is biasing swing arm 70 clockwise, and wherein support arm portion 238b and bias arm part 238c radially stretch out from coiling part 238a.Torsionspring 238 is on swing arm 70, to apply bias force through bar engagement projections 51j along the mode that optical axis direction pushes the 3rd lens group frame 51 forward.
70 of swing arms are nonelastic in its swaying direction.Yet; Bias force through 238 pairs of swing arms 70 of torsionspring; The bias arm part 238c of torsionspring 238 and the combination of swing arm 70; Realize swinging the function of force part in fact, similar with the bias arm part 38c of torsionspring 38 among first embodiment of position of optical element control gear, perhaps with second embodiment of position of optical element control gear in the bias arm part 138c of bias spring 138 similar.Therefore, as the bias unit among above-mentioned (first and second) embodiment, even bias unit is installed in optical axis direction with the mode of saving the space, also can the loads change to the 3rd lens group frame 51 reduces the load on the AF motor 30 under the application of force state through reducing.Different with the 3rd embodiment, can make the coiling part 238a of torsionspring 238 be different from the support of the swing supporting projections 22m of swing arm 70.
Except that torsionspring 238 is stretched the bias component of the swing arm 70 that spring (bar bias component) 338 replaces adopting as the 3rd embodiment that is used for setovering, the 4th embodiment shown in Figure 20 is similar with the 3rd embodiment shown in Figure 17 to 19.Swing arm 70 has principal arm 70b; Principal arm 70b extends from swing arm 70 rotating parts (axis hole 70a) edge and the direction of the bar engagement projections 51j engagement of the 3rd lens group frame 51; Swing arm 70 further has carbine arm 70c, carbine arm 70c direction extension opposite basically with the bearing of trend of principal arm 70b from rotating part (axis hole 70a) edge of spring lever 70.Extension spring 338 is installed is made its edge be basically parallel to the direction extension of optical axis O, an end of extension spring 338 and the other end are hooked in carbine arm 70c respectively and are formed on the carbine 22p on the frame 22.In swing arm 70, the distance B 1 from axis of swing 70x to swing arm the mate E1 70 and bar engagement projections 51j engagement is than the distance B 2 the mate E2 70 and extension spring 338 engagements is bigger from axis of swing 70x to swing arm; Be D1>D2.Because the ratio (lever ratio) of length between principal arm 70b and the carbine arm 70c, the 3rd lens group frame 51 is bigger along the amount of movement (amount that mate E2 rotates around swing optical axis 70x) of the mate E2 on every Moving Unit corresponding spring hook arm 70c of optical axis direction than the 3rd lens group frame 51 along the amount of movement (amount that mate E1 rotates around axis of swing 70x) of the mate E1 on the corresponding principal arm 70b of every Moving Unit of optical axis direction.Therefore; Can know through contrast Figure 13 and Figure 20; Under application of force state to the 3rd lens group frame 51, the displacement Lv3 between the minimum length Lmin of extension spring 338 and the maximum length Lmax is littler than the displacement Lv2 in the comparison example shown in Figure 13; Therefore loads change can be reduced to than use independent extension spring as littler degree under the situation of the bias unit of the 3rd lens group frame 51 that is used to setover, and can alleviate the load on the AF motor 30 through reducing peak load like this.
Extension spring 338 quilts in the 4th embodiment extension spring (bar bias component) 438 different with the draw direction of extension spring 338 replaced, the 5th embodiment shown in Figure 21 was similar with the 4th embodiment shown in Figure 20.Swing arm 70 has from the outstanding carbine arm 70d of the rotating part of swing arm 70 (axis hole 70a), and its projected direction is vertical basically with the bearing of trend of principal arm 70b, promptly meets at right angles basically with principal arm 70b.Extension spring 438 is installed is made its edge vertical basically with Zoom lens barrel, promptly consistent with principal arm 70b bearing of trend direction is extended, and wherein an end hook of extension spring 438 is on carbine arm 70d, and the other end is hooked on the carbine 22q that is formed on the frame 22.In swing arm 70, the distance B 1 of and mate E1 bar engagement projections 51j engagement 70 from axis of swing 70x to swing arm, than the distance B 3 with mate E3 extension spring 438 engagements 70 are bigger from axis of swing 70x to swing arm, i.e. D1>D3.Therefore; When the 3rd lens group frame 51 when optical axis direction moves forward and backward; Principal arm 70b goes up the amount of movement (amount that mate E1 rotates around axis of swing 70x) of mate E1, and is bigger than the amount of movement (amount that mate E3 rotates around axis of swing 70x) of the mate E3 on the carbine arm 70d.Therefore; Under application of force state to the 3rd lens group frame 51; Displacement Lv4 between the minimum length Lmin of extension spring 438 and the maximum length Lmax less (the displacement Lv2 than comparison example shown in Figure 13 is little); Therefore loads change can be reduced to than adopt independent extension spring as littler degree under the situation of the bias unit of the 3rd lens group frame 51 that is used to setover, and can alleviate the load on the AF motor 30 through reducing peak load like this.
In the 4th embodiment, it is desirable to the expression formula that meets the following conditions of the ratio between the length (D1) of the principal arm 70b of swing arm 70 and the length (D2) of carbine arm 70c: D2 < D1/>2.Likewise, in the 5th embodiment, it is desirable to the expression formula that meets the following conditions of the ratio between the length (D1) of the principal arm 70b of swing arm 70 and the length (D3) of carbine arm 70d: D3 < D1/>2.
Can know from the 4th and the 5th embodiment; Through with the bias unit of swing arm 70 as the 3rd lens group frame 51 that is used to setover; Can reduce the loads change of bias unit through the structure of compact design on optical axis direction, replace torsionspring even if be employed in the extension spring of axial tension and contraction.Viewpoint even if replace the extension spring 338 or 438 among the 4th or the 5th embodiment through the bias unit that constitutes by compression spring and swing arm, also can obtain similar effect thus.
In addition; Among above-mentioned each embodiment; Be used for along the optical axis O direction bias unit that the 3rd lens group frame 51 or lens-mount 151 make framework 51 or 151 move along equidirectional of setovering; Also along the vertical direction of the moving direction of framework 51 or 151, load application on framework 51 or 151 is to move the gap of eliminating framework 51 or 151 in the guide in forward/back.
The bias arm part 38c edge of torsionspring 38 swinging plane (swing by in Figure 10 and 11 bias arm part 38c solid line shown in move definition) vertical with axis of swing 38x extends among first embodiment; And when in (wherein the bias arm part 38c of torsionspring 38 and carbine 51h engagement) the 3rd lens group frame 51 under the application of force state when optical axis O moves, in above-mentioned swinging plane, swing.Notice that carbine 51h is positioned at the hunting range by the bias arm part 38c of the radius length definition of bias arm part 38c.When the bias arm part 38c of torsionspring 38 is in free state; When wherein bias arm part 38c does not mesh with carbine 51h; Bias arm part 38c is with respect to swinging plane inclination (promptly being positioned at outside the swinging plane); It has the shape to optical axis O inclination, shown in double dot dash line in Figure 10 and 11.When bias arm part 38c gets into application of force state; When wherein the bias arm part 38c of torsionspring 38 and carbine 51h mesh; Elastic deformation takes place in bias arm part 38c; For Figure 10 and 11 rotate counterclockwise up to be formed on the 3rd lens group frame 51 on vertical wall segments 51k contact (so bias arm part 38c and above-mentioned swinging plane consistent), thereby avoid turning back to free state.Form vertical wall segments 51k according to the flat shape substantially parallel with the swinging plane of bias arm part 38c, the 3rd lens group frame 51 has the semi-circular cross-section part 51m that contacts with bias arm part 38c on vertical wall segments 51k.Be formed on the 3rd lens group frame 51 and, be positioned at before the semi-circular cross-section part 51m from its outstanding carbine 51h.
When bias arm part 38c from free state generation elastic deformation, with vertical wall segments 51k (semi-circular cross-section part 51m) when contacting, the elasticity that the vertical wall segments 51k of the 3rd lens group frame 51 is biased arm portion 38c for Figure 10 and 11 to right-hand offset.Vertical wall segments 51k is located immediately at and is formed near the lead arm part 51b radial outer end this under the bullport 51d; 38c is added to the load on the vertical wall segments 51k from the bias arm part, as promote this extruding force to bullport 51d to the right for Figure 10 and 11.Therefore, this inner wall surface to bullport 51d is pressed against the 3rd lens combination leading axle 52, thereby eliminates the 3rd lens combination leading axle 52 and this motion to the vertical direction of edge the 3rd lens group frame 51 moving directions (along optical axis O direction) between the bullport 51d.In addition; Moment is applied on anti-projection 51e of rotation and the straight line guiding groove 22f; Wherein anti-protrusion 51e and the straight line guiding groove 22f of rotating is symmetrically located at and this side to the bullport 51d optical axis O relative with the 3rd lens combination leading axle 52; Thereby resist rotation protrusion 51e to be pressed against one of guiding surface relative among the straight line guiding groove 22f, to eliminate the anti-gap of protruding between 51e and the straight line guiding groove 22f of rotating.Therefore, can stably keep the 3rd lens group frame 51, avoid and to have moved the change in location that the removing in the guide causes by forward/back.Be convenient torsionspring 38 when being in application of force state, biasing wall part 38c is applied to being applied on the vertical wall 51k that the bias force of vertical wall segments 51k continues, makes the 3rd lens group frame 51 be moved to the optional position, and this stable hold mode still is held.This makes can move the 3rd lens group frame 51 smoothly, and does not produce gap or noise.In addition, under the state that the 3rd lens group frame 51 is stopped, the position precision of the 3rd lens group frame 51 in the plane vertical with optical axis O is enhanced.The vertical wall segments 51k and the semi-circular cross-section part 51m that it should be noted that the 3rd lens group frame 51 also have when bias arm part 38c and carbine 51h engagement, prevent the function that bias arm part 38c contacts with near any part except that carbine 51h.
Owing to the torsionspring 38 (bias arm part 38c) of the 3rd lens group frame 51 of setovering along optical axis O direction also applies the bias unit of bias force for vertical wall segments 51k as the vertical direction of edge and the 3rd lens group frame 51 moving directions; Therefore also can eliminate the 3rd lens group frame 51 through the structure that constitutes by few components of simply saving the space and guide the gap between the element (for example the 3rd lens combination leading axle 52 and straight line guiding groove 22f) of the 3rd lens group frame 51 along optical axis direction, and the independent bias component that is specifically designed to the elimination gap need be provided.
Similar with the bias arm part 38c of torsionspring 38 among first embodiment; Among second embodiment; The bias arm part 138c that is in the torsionspring 138 of free state (wherein bias arm part 138c is not hooked on the carbine 151c) (is in application of force state with respect to the position of bias arm part 138c in swinging plane; Shown in solid line among Figure 16) also have the shape that tilts to optical axis O, shown in double dot dash line among Figure 16.In addition; When bias arm part 138c gets into application of force state; Wherein bias arm part 138c is hooked on the carbine 151c; Bias arm part 138c is for Figure 16 elastic deformation along clockwise direction, and the elasticity of bias arm part 138c makes bias arm part 138c push the outer surface part (contact portion) of the cylindrical part 151a of lens-mount 151 left for Figure 16.This extruding force has prevented lens-mount 151 relative leading axle 152 vibrations, and the position of stable lens combination LG in the plane vertical with optical axis O.That is to say; Torsionspring 138 has following two kinds of functions: along the moving direction of lens-mount 151 function to lens-mount 151 biasings; With along the vertical direction of lens-mount 151 moving directions function to lens-mount 151 biasings, therefore can be with simple and the Stability Analysis of Structures ground that is made up of few components that save the space keeps lens-mount 151.
The swing arm 70 of the 3rd to the 5th embodiment in each is also along the vertical direction of the 3rd lens group frame 51 moving directions, to the 3rd lens group frame 51 load applications.With the representative of the swing arm among the 3rd embodiment 70 as the swing arm of the 3rd to the 5th embodiment in each; Swing arm 70 is along the direction elastic deformation perpendicular to optical axis O; And the swing arm 70 (wherein swing arm 70 is not hooked on the carbine 51h) that is in free state has with respect to swing arm 70 in the application of force state (is represented) shape to optical axis O inclination by solid line in Figure 17 and 18 in the position on the swinging plane, shown in double dot dash line in Figure 17 and 18.In addition; When swing arm 70 gets into application of force state; When wherein swing arm 70 was hooked on the carbine 51h, swing arm 70 was for Figure 17 and 18 edge elastic deformations counterclockwise, so that contact with the vertical wall segments 51k (semi-circular cross-section part 51m) of the 3rd lens group frame 51; And swing arm 70 pushes vertical wall segments 51k through the elasticity of swing arm 70 to the right for Figure 17 and 18.Its extruding force has been avoided relative the 3rd lens combination leading axles 52 of the 3rd lens group frame 51 and straight line guiding groove 22f vibration, and has stablized the 3rd lens combination LG3 perpendicular to the position in the plane of optical axis O.That is to say; Swing arm 70 has following two kinds of functions: through the bias force of torsionspring 238; The moving direction of edge the 3rd lens group frame 51 is to the function of the 3rd lens group frame 51 biasings; With the function of the 3rd lens group frame 51 being setovered, therefore can keep the 3rd lens group frame 51 with the Stability Analysis of Structures ground that constitutes by few components in simple saving space along the vertical direction of the 3rd lens group frame 51 moving directions.Although its details no longer is discussed in the following description, the swing arm 70 of the 4th and the 5th embodiment in each also has along the setover multiple function of the 3rd lens group frame 51 of two different directions.
Figure 22 to 26 has provided improvement embodiment, and each structure of improving embodiment can keep the holding member of optics original paper to apply bias force to the vertical direction along its moving direction with more effective mode.Except particular structurally with first embodiment in different, it is basic identical with above-mentioned first embodiment that these improve embodiment, below will omit in the description to first embodiment in the description of element components identical.
Figure 22 and 23 has provided first and has improved embodiment.In this embodiment, image pick-up device retainer 23 has main part 23a and protective bulkhead part (pressurizing unit/fixed wall parts/outer wall parts) 23b.Main part 23a keeps image pick-up device 24, and the rear portion of the cylindrical part of sealing frame 22 (pressurizing unit/fixed wall parts/inwall parts/interior cylindrical parts) 22a, and protective bulkhead part 23b extends forward along optical axis direction from main part 23a.Protective bulkhead part 23b forms accommodation space (accommodation space) Q towards the external peripheral surface of cylindrical part 22a between the external peripheral surface of protective bulkhead part 23b and cylindrical part 22a.Torsionspring 38 remains among the accommodation space Q.As stated; The bias arm part 38c that is in the torsionspring 38 of free state has the shape to optical axis O inclination; Shown in double dot dash line among Figure 23, and be in application of force state, when wherein bias arm part 38c and carbine 51h mesh; Elastic deformation takes place in the bias arm part 38c of torsionspring 38, shown in solid line among Figure 23.Spring crimping section (extruding projection) 23c that under application of force state, contacts with bias arm part 38c extruding is formed on the protective bulkhead part 23b of rear wall 23.Shown in figure 22; Spring crimping section 23c is formed on and protects on the surface towards accommodation space Q (just towards protective bulkhead part 23b the surface towards the external peripheral surface of cylindrical part 22a) of arm portion 23b, has the rib shape of extending along optical axis direction.No matter in its moving range, spring crimping section 23c contacts with bias arm part 38c the 3rd lens group frame 51 all the time.
Confirm the amount of the projection of spring crimping section 23c, make when bias arm part 38c is hooked on the carbine 51h that spring crimping section 23c is along the direction extruding bias arm part 38c towards vertical wall segments 51k (semi-circular cross-section part 51m).Therefore; The vertical direction of bias force edge the 3rd lens group frame 51 moving directions of torsionspring 38 is applied on the 3rd lens group frame 51 reliably, to eliminate the gap between the 3rd lens combination leading axle 52 (guide member is moved in the forward/back as the 3rd lens group frame 51) and the bullport 51d satisfactorily.
Figure 24 has provided second and has improved embodiment.This improves embodiment and the first improvement embodiment similarity is; In Figure 24 by under the application of force state shown in the solid line; Be formed at the spring crimping section 23c on the protective bulkhead part 23b of image pick-up device retainer 23, on the bias arm part 38c of torsionspring 38, apply bias force.Yet; The difference that the second improvement embodiment and first improves between the embodiment is; Second improves among the embodiment; The cylindrical part 22a ' of frame 22 _ be not complete right cylinder, promptly cylindrical part 22a ' is incomplete right cylinder, wherein lacks that part of towards protective bulkhead part 23b that corresponds to cylindrical part 22a.Because this change; The coiling part 38a of torsionspring 38 is installed on the carbine 23d that is formed on the protective bulkhead part 23b; Rather than be contained on the cylindrical part 22a '; Thereby supported by carbine 23d, and spring fixed screw 39 ' be screwed on the carbine 23d, be used for avoiding coiling part 38a and come off from carbine 23d.So, being positioned at the shape of the tubular part (cylindrical part 22a ') of inboard with respect to bias unit (torsionspring 38) (just, being positioned at than bias unit from the farther position of protective bulkhead part 23b) needn't be for complete cylindrical; In this case, can be effectively be formed for pushing the crimping section of bias unit (torsionspring 38) outside on the wall components (protective bulkhead part 23b).
Figure 25 has provided the 3rd and has improved embodiment.The similarity that the 3rd improvement embodiment and above-mentioned first and second improves embodiment is; The protective bulkhead part 23b of the bias arm part 38c extruding image pick-up device retainer 23 of torsionspring 38, thus make the bias force of the vertical direction of edge the 3rd lens group frame 51 moving directions act on the 3rd lens group frame 51 reliably; Yet; The difference that the 3rd improvement embodiment and first and second improves embodiment is; Through adopting the 3rd to improve the biasing wall part 38c of the special shape among the embodiment, and do not adopt spring crimping section 23c, similarly bias force is acted on the 3rd lens group frame 51 reliably.Particularly; Improve among the embodiment the 3rd; The bias arm part 38c of torsionspring 38 has stretch out part (first extension) 38c-1, the sweep 38c-2 and part (second extension) 38c-3 that extends internally, and above each several part is outstanding to protective bulkhead part 23b at sweep 38c-2 place.The part that stretches out 38c-1 extends (along the direction away from cylindrical part 22a) from coiling part 38a to protective bulkhead part 23b obliquely; The sweep 38c-2 and the part 38c-1 that stretches out form continuously, and the part that extends internally 38c-3 extends to cylindrical part 22a from sweep 38c-2 obliquely.When elastic deformation takes place in bias arm part 38c, when the free state from Figure 25 shown in the double dot dash line gets among Figure 25 the application of force state shown in the solid line, sweep 38c-2 extruding protective bulkhead part 23b.Therefore because the reacting force of this extruding force, biasing wall part 38c extend internally part 38c-3 by with first and second improve embodiment the similar mode of situation, push to vertical wall segments 51k (semi-circular cross-section part 51m).
Figure 26 has provided the 4th and has improved embodiment.Improve among the embodiment at this; Opposite with first to the 3rd improvement embodiment; The crimping section of the bias arm part 38c of extruding torsionspring 38 is formed on the cylindrical part 22a of frame 22, but not is formed on the protective bulkhead part 23b of image pick-up device retainer 23.Improve among the embodiment the 4th, bias arm part 38c moves shown in biased direction and Figure 23 to 25 of leader (the 3rd lens combination leading axle 52 and bullport 51d) in the opposite direction in the situation to the forward/back of the 3rd lens group frame 51.When elastic deformation takes place bias arm part 38c; And when the free state shown in the double dot dash line got among Figure 26 the application of force state shown in the solid line from Figure 26, bias arm part 38c was squeezed in the vertical wall segments 51k ' (semi-circular cross-section part 51m ') that the end place of carbine 51h forms along the direction away from optical axis O.Cylindrical part 22a provides spring crimping section (extruding projection) 22r on its external peripheral surface; This spring crimping section 22r is projected into (along the direction near protective bulkhead part 23b) among the accommodation space Q; Under application of force state, spring crimping section 22r is along the direction extruding protective bulkhead part 23b near vertical wall segments 51k ' (semi-circular cross-section part 51m ').Therefore, improve among the embodiment the 4th, the bias force of the vertical direction of edge the 3rd lens group frame 51 moving directions also can act on the 3rd lens group frame 51 through the bias arm part 38c of torsionspring 38 reliably.
In the embodiment that bias arm part 38c is pushed by cylindrical part 22a, bias arm part 38c can be formed the sweep the bias arm part 38c with the torsionspring 38 in the 3rd improvement embodiment.Just, although in the embodiment shown in Figure 25, bias arm part 38c is bent to the protrusion to protective bulkhead part 23b, and bias arm part 38c also can bend to the protrusion to cylindrical part 22a, makes sweep be pressed against cylindrical part 22a.But, it is desirable to, on the external peripheral surface of cylindrical part 22a, form the special crimping section as spring crimping section 22r, thereby when the sweep of bias arm part 38c is pressed against cylindrical part 22a, guarantee its stability.
Each all is applied to the bias arm part 38c of the torsionspring 38 among first embodiment although first to the 4th improves embodiment; Each also can be applicable to the bias arm part 138c of the torsionspring 138 among second embodiment and the swing arm 70 among the 3rd to the 5th embodiment but first to the 4th improves embodiment.Application of force state at bias arm part 138c or swing arm 70; Through vertical direction extruding bias arm part 138c or swing arm 70 along holding member (51 or 151) moving direction; Can more effectively avoid forward/back to move the gap of guide member, wherein holding member (51 or 151) moves guide member (the 3rd lens combination leading axle 52/ leading axle 152) guiding by forward/back.
Although discussed the described embodiment of foregoing invention with reference to accompanying drawing, the present invention is not confined to these certain embodiments.For example, although in the above-described embodiments, the optical element that moves forward and backward along optical axis direction is designated as the lens combination that is used to focus on, and the present invention is applicable to the position control mechanism of the position of the optical element of control except that focus lens group.
Although the support arm portion 38b of the torsionspring 38 among first embodiment; Among the support arm portion 238b of the torsionspring 238 among the 3rd embodiment and the 4th and the 5th embodiment extension spring 338 and 438 each an end all separately with frame 22 on the projections mesh that forms; But the parts that form this projection are not limited to the for example fixed part of frame 22; And can be movable part, can be as long as form the parts of projection on it at least with respect to moving with the 3rd lens group frame 51 corresponding holding members.Equally, the support component of rotary supporting rod 70 is not limited to the for example fixed part of frame in the 3rd to the 5th embodiment, and can be movable part, as long as at least with respect to moving with the 3rd lens group frame 51 corresponding holding members.
In addition; In above-mentioned each embodiment, the bias arm part 38c of torsionspring 38, the bias arm part 138c and the swing arm 70 of torsionspring 138 all have straight-line profile; And under application of force state; When the bias arm part 38c of torsionspring 38 wherein, biasing wall part 38c or 138c or swing arm 70 mesh with the 3rd lens group frame 51 or lens-mount 151, the bias arm part 38c of torsionspring 38; The bias arm part 138c of torsionspring 138 and swing arm 70 respectively in fixing swinging plane around axis of swing 38x, 138x and 70x swing.Yet in the present invention, the force part that can swing (but swing part) is not limited to such straight-line profile parts.For example, such just as the bias arm part 38c of curved shown in Figure 25, can swing the force part and can be molded into multiple shape.If can swing the force part is not simple linear part, and to tilting perpendicular to the axis of swing direction, the mobile route that can swing the force part will no longer simply be positioned at the plane perhaps even under application of force state.Yet, can swing the specific part of force part if pay close attention to, can swing the force part and can suppose in the fixed pan of axis of swing, moving.In the present invention, the residing plane perpendicular to axis of swing of the mobile route of this specific part is defined as swinging plane.
Can do significantly to change to specific embodiment of the present invention described here, such change be within essence of the presently claimed invention and scope.Need point out that all the elements that comprise all are schematically, and do not limit the scope of the invention here.

Claims (15)

1. position of optical element control gear comprises:
The optical element holding member is used to keep the optical element of camera chain;
Guide member is moved in forward/back, is used to guide said optical element holding member, enables to move along the optical axis direction of said camera chain; And
The bias unit that comprises arm, said arm can be swung around the axis of swing vertical with said optical axis, and meshes with said optical element holding member,
Wherein said bias unit passes through said arm on said optical element holding member; Apply simultaneously along the bias force of the moving direction of the said optical element holding member that moves the guide member guiding by said forward/back; And the bias force of the vertical direction of the said moving direction of the said optical element holding member in edge
Wherein said mechanism also comprises cam ring, is used for moving with said optical element through the rotation of said cam ring separating at least one optical element that provides, and wherein said bias unit radially is positioned at the outside of said cam ring.
2. position of optical element control gear according to claim 1, wherein said bias unit comprises torsionspring, torsionspring comprises:
By separating the coiling part of the support member supports that provides with said optical element holding member, the central shaft of said coiling part is consistent with said axis of swing;
Constitute said arm and from said coiling part outward radial extend in case with the first arm part of said optical element holding member engagement; And
Extend second arm portion that meshes with said support component from said coiling part outward radial,
Wherein said torsionspring moves according to said optical element holding member, changes its elastically-deformable amount in the direction of rotating around said axis of swing,
Wherein under the application of force state of said bias unit, wherein said the first arm part and the engagement of said optical element holding member, said the first arm part is along being extended by the defined swinging plane of its oscillating motion around said axis of swing,
Wherein under the free state of said bias unit, wherein said the first arm part breaks away from said optical element holding member, and said the first arm partly is positioned at outside the said swinging plane, and
Wherein when said bias unit when said free state gets into said application of force state, said the first arm part is along making its direction elastic deformation consistent with said swinging plane.
3. position of optical element control gear according to claim 1; The said arm of wherein said bias unit comprises that the one of which end is separating the bar that rotates on the support component that provides with the optical element holding member; The other end of said bar and the engagement of said optical element holding member, and
Wherein said bias unit comprises the bar bias component, is used for around said axis of swing edge forward and the said bar of one of direction biasing that rotates backward,
Wherein under the application of force state of said bias unit, wherein said bar and the engagement of said optical element holding member, said bar is along being extended by the defined swinging plane of its oscillating motion around said axis of swing,
Wherein under the free state of said bias unit, wherein said bar and said optical element holding member break away from, and said bar is positioned at outside the said swinging plane, and
Wherein when said bias unit when said free state gets into said application of force state, said bar is along the direction generation elastic deformation near said swinging plane.
4. position of optical element control gear according to claim 1, wherein said forward/back move guide member and comprise leading axle, and the axle of this leading axle extends along said optical axis direction,
Wherein said optical element holding member comprises bullport, and said leading axle is inserted in this bullport slidably, and
The said arm of wherein said bias unit contacts with the contact portion of the said bullport of next-door neighbour, and pushes said optical element holding member with the mode that the inner wall surface that causes said bullport presses said leading axle.
5. position of optical element control gear according to claim 4; Wherein said optical element holding member comprises from the projection of the hunting range of said contact portion said arm outstanding and that be positioned at said bias unit, is used for receiving the said bias force along the said moving direction of said optical element holding member.
6. position of optical element control gear according to claim 1; Further comprise pressurizing unit; This pressurizing unit is in application of force state at said bias unit; When wherein said arm and the engagement of said optical element holding member, the vertical direction of the said moving direction of the said optical element holding member in edge is pushed said bias unit.
7. position of optical element control gear according to claim 6, wherein said pressurizing unit comprise the inboard that is positioned at said bias unit and the outside fixed wall parts of one of which at least, and
The said arm of wherein said bias unit contacts with said fixed wall parts, thereby the said vertical direction of the said moving direction of the said optical element holding member in edge is extruded.
8. position of optical element control gear according to claim 7, wherein said fixed wall parts comprise the outer wall parts that are positioned at the said bias unit outside, and wall components is along the said arm that pushes said bias unit near the direction of said optical axis in addition.
9. position of optical element control gear according to claim 7, wherein said fixed wall parts comprise the inwall parts that are positioned at said bias unit inboard, and these inwall parts are along the said arm that pushes said bias unit away from the direction of said optical axis.
10. position of optical element control gear according to claim 7, wherein said fixed wall parts comprise the extruding projection that contacts with the said arm extruding of said bias unit.
11. position of optical element control gear according to claim 7, the said arm of wherein said bias unit protrudes to said fixed wall parts, thereby the sweep of said bias unit is contacted with said fixed wall parts.
12. position of optical element control gear according to claim 11; The said arm of wherein said bias unit comprise towards said fixed wall parts extend to first extension of said sweep and away from said fixed wall parts from second extension that said sweep extends out.
13. position of optical element control gear according to claim 6 further comprises:
Be positioned at the cylindrical parts outside the said optical element holding member; And
Be positioned at the outer wall parts outside the said optical element holding member towards the outside surface of said cylindrical parts,
Wherein said bias unit remains between said interior cylindrical parts and the said outer wall parts; One of cylindrical parts and said outer wall parts in the said arm extruding contact of said bias unit is said, thus the vertical direction of the said moving direction of the said optical element holding member in edge is extruded.
14. position of optical element control gear according to claim 1, wherein said optical element holding member is not rotated around said optical axis by the straight line guiding.
15. position of optical element control gear according to claim 2, wherein said position of optical element control gear is combined in the phtographic lens unit, and said support component constitutes the fixed part of said phtographic lens unit.
CN2008101755554A 2007-11-09 2008-11-07 Mechanism for controlling position of optical element Expired - Fee Related CN101430413B (en)

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JP5970344B2 (en) * 2012-11-09 2016-08-17 Hoya株式会社 Optical element position control mechanism
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