CN101430414B - Mechanism for controlling position of optical element - Google Patents
Mechanism for controlling position of optical element Download PDFInfo
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- CN101430414B CN101430414B CN 200810175556 CN200810175556A CN101430414B CN 101430414 B CN101430414 B CN 101430414B CN 200810175556 CN200810175556 CN 200810175556 CN 200810175556 A CN200810175556 A CN 200810175556A CN 101430414 B CN101430414 B CN 101430414B
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- holding member
- torsionspring
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Abstract
An optical element position control mechanism includes an optical element holding member which holds an optical element of a photographing system and is guided in an optical axis direction; a drive mechanism for moving the optical element holding member in the optical axis direction; and a biasing device including an arm which is swingable about a swing axis, the swing axis being substantially orthogonal to the optical axis, and the arm extending substantially orthogonal to the swing axis and having a free end portion which engages with the optical element holding member to bias the optical element holding member in the optical axis direction.
Description
Technical field
The present invention relates to be used to control the mechanism of position of optical element in optical device, or rather, relate to the structure that the optical element holding member is provided, this structure can move along optical axis direction by the bias force on the moving direction of optical element holding member.
Background technology
In the optical device of for example camera, such situation often appears, the bias force that is optical axis direction is bestowed the optical element holding member, this optical element holding member supporting optical component and can moving at optical axis direction, thus make the optical element holding member have function, eliminate the gap (backlash) in the driving mechanism or the position of stable optical element-retaining member as the part of the driving mechanism that drives the optical element holding member.Be used to setover the bias unit of optics element-retaining member usually by stretching or compression spring is made, this spring is installed to be its axle is extended along optical axis direction.This configuration for example is disclosed in, and Japanese unexamined patent discloses among the 2000-206391.
In the mounting structure of the stretching of the bias unit that is widely used as biasing optics element-retaining member or compression spring, the two ends of spring are meshed optical element holding member and independent support component (being fixed part) respectively, wherein this support component does not move with the optical element holding member, thereby makes the amount of movement of optical element holding member directly influence the amount of tension of spring.Along with the increase of spring amount of tension, the variable range of load on spring also increases.
Simultaneously, be confirmed as to hold bias unit be used to the to setover maximum load of optics element-retaining member as the output of the motor of the element of the driving mechanism of optical element holding member or actuator.In other words, the maximum load of spring members is big more, and the required drive source that is used for the optical element holding member is also just strong more, this power consumption for the equipment that comprises drive source, manufacturing cost and to minimize be disadvantageous.Yet in the conventional mounting structure of stretching that is used for the optical element holding member or compression spring, the load on spring that changes according to the spring amount of tension trends towards having variation range greatly, thereby is difficult to minimize maximum load on spring.
Stretch or compression spring in, by stretching or the compression spring that employing has longer length, might obtain being used for the load variations that reduces of spring of the specific amount of movement of optical element holding member.Yet, in the optical device of making in recent years, have the demand of strong miniaturization, but the length that increases spring is conflicting with the saving in space, thereby is difficultly adopted.Particularly, in the zoom lens tube, be starved of and hold state at the lens drum that does not carry out image acquisition and make it compact more, and the common employing lens drum structure that can bounce back, wherein minimize as far as possible, thereby be in the length that reduces lens drum when holding state at lens drum in the distance between a plurality of optical elements on the optical axis direction.Like this, the length of optical element holding member on its moving direction is subjected to the restriction of lens drum length that can bounce back, thereby is difficult to adopt long spring when bias unit biasing optics element-retaining member.The result is, is easy to occur have the problems referred to above of the load on spring of big variable range.
In addition, though can reduce the variable range of load on spring by the amount of movement that reduces the optical element holding member, but the amount of movement of optical element holding member (promptly, the amount of movement of the optical element that is supported by the optical element holding member) be determined from the beginning satisfying the needs of optical property, and if the amount of movement of optical element holding member just be restricted and can't obtain described optical property.For example, in the as far as possible little zoom lens tube that optical axis direction makes up, when the zoom lens tube was designed to the high magnification lens and is in above-mentioned lens drum hold state, the amount of movement of optical element holding member was often very big.
Summary of the invention
The invention provides a kind of position of optical element control gear, wherein by optical element holding member mobile being used to of causing the setover load variations of spring of optics element-retaining member little, even this mechanism can be configured in the mode of saving the space, and wherein obtain to minimize and low-power consumption with high level very.
In addition; the invention provides a kind of position of optical element control gear; it comprises a kind of like this bias unit that has reduced load variations; wherein bias unit is avoided being damaged by the protection of safety; described damage may come from the outside or the inner contact of other element, or contact bias Unit Installation workman's hand.
According to an aspect of the present invention, provide a kind of position of optical element control gear, having comprised: the optical element holding member, it supports the optical element of camera chain and is directed on optical axis direction; Driving mechanism, it is used for moving described optical element holding member on described optical axis direction; And bias unit, it comprises can be around the arm of axis of swing swing, described axis of swing basically with described light shaft positive cross, and described arm extends with described axis of swing quadrature basically and have free end portion with described optical element holding member engagement so that at the described optical element holding member of described optical axis direction upper offset.
Ideal situation is, bias unit comprises torsionspring, and it comprises: by separating the coiling part of the supporting units support that provides with the optical element holding member, the central shaft of wherein coiling part is consistent basically with axis of swing; The first arm part, it constitutes described arm, and extends from the coiling part outward radial in its free end portion and the engagement of optical element holding member; Second arm portion, it extends from the coiling part outward radial with described support component engagement.Wherein, according to moving of optical element holding member, the torsionspring drum changes its elastically-deformable amount on the rotation direction of central shaft at torsionspring of part.
Ideal situation is, from the free state of described the first arm part up to partly enter application of force state when described the first arm, the amount of the angular displacement of described the first arm part on its rotation direction, greater than moving forward between the limit and the mobile backward limit at described optical element holding member under the application of force state, the amount of the angular displacement of described the first arm part on its rotation direction, wherein, under the free state of described the first arm part, described the first arm part and described optical element holding member are thrown off, partly enter under the application of force state described the first arm part and the engagement of described optical element holding member at the first arm.
Ideal situation is, the arm of bias unit comprises bar, and an end of bar rotates the other end of bar and the engagement of optical element holding member separating on the support component that provides with the optical element holding member; And described bias unit comprises and being used for around the bar bias component of axis of swing at forward and the reverse described bar of rotation direction upper offset.
Ideal situation is, described bar bias component comprises torsionspring, and described spring comprises: by the coiling part of described supporting units support, the central shaft of described coiling part is consistent with described axis of swing basically; The first arm part, it extends from described coiling part outward radial, thereby meshes with described bar; And second arm portion, it extends from described coiling part outward radial, thereby partly meshes with the carbine of described support component.Swing according to described bar is moved, and around the central shaft of described coiling part, on the rotation direction of described torsionspring, described torsionspring changes its elastically-deformable amount.
Ideal situation is, described bar bias component comprises extension spring, an end of described extension spring and the other end respectively with described bar and the engagement of described support component, the length of described extension spring moves according to the swing of described bar and changes.
Ideal situation is, bar from axis of swing to described bar and the distance the mate of described extension spring engagement less than the distance the mate that meshes with described optical element holding member from axis of swing to described bar.
Ideal situation is, the position of optical element control gear comprises swivel becket, and it moves at least one and separate the optical element that provides with optical element by rotating described swivel becket, and described driving mechanism and described bias unit are positioned at the radial outside of described swivel becket.According to this structure, bias unit can be configured to not limit for example movable part of swivel becket.
Ideal situation is, the free end portion of the arm of axis of swing and bias unit is positioned at beyond the swivel becket, and among both of two spaces that provide in the both sides, plane, described plane is arranged essentially parallel to described axis of swing and is positioned on the described optical axis respectively.Therefore, the load variations of bias unit effectively reduces, and can improve space availability ratio.
Ideal situation is that described driving mechanism comprises: screw shaft, and it rotates around the axle that is parallel to described optical axis; And nut, itself and described screw shaft luer engages with, and moving forward and backward on optical axis direction with rotating backward forward by described screw shaft.Contact to determine the position of described optical element holding member on described optical axis direction with described optical element holding member by described nut.Described bias unit contacts the described optical element holding member of direction upper offset of described nut at the described optical element holding member of guiding.
Ideal situation is that driving mechanism comprises: guide member, and it comprises at least one guiding surface, and the described relatively optical axis direction of described guiding surface tilts; With follow part, it is outstanding from described optical element holding member, to slide on described guiding surface.The described bias force of part by described bias unit of following is pressed on the guiding surface of described guide member.
Ideal situation is, guide member is included in the cam lever that extends on the optical axis direction, wherein guiding groove is as cam path, following part described in this cam path by can being meshed slidably, this cam path is formed on the circumferential surface of described cam lever, and described guiding surface is positioned at the inside of described guiding groove.
Ideal situation is that position control mechanism comprises: the holding cylindrical part, and it is positioned at the inside of described bias unit, and around described photographic optical system; And protective bulkhead parts; its as with described holding cylindrical part element and being provided independently mutually; and be fixed on described holding cylindrical and partly go up with the external peripheral surface that produces described holding cylindrical part and the spatial accommodation between the described protective bulkhead parts, described bias unit is housed inside in the described spatial accommodation.
Ideal situation is, protective bulkhead parts and image pick-up device retainer are one, and described image pick-up device retainer keeps image pick-up device, forms the position thereby described image pick-up device is in image.
Ideal situation is, holding cylindrical parts or protective bulkhead parts comprise the mobile supporting projections of swing, and the mobile supporting projections of described swing supports the oscillation centre part of described bias unit, thereby allows described arm to move around described axis of swing swing.
Ideal situation is that the protective bulkhead parts comprise the sidewall sections that is arranged essentially parallel to swinging plane, swing around described axis of swing at the described arm of bias unit described in the described swinging plane.
Ideal situation is, the holding cylindrical parts comprise the swivel becket guide, it is equipped on the inner circumferential surface of described holding cylindrical parts, almost guides on the whole circumference scope of described holding cylindrical parts, be used for guiding rotationally swivel becket, be positioned at the inside of described holding cylindrical parts, thereby on described optical axis direction, control the position of described swivel becket.By the rotation of described swivel becket, at least one optical element that independently provides with optical element is provided described swivel becket.
Ideal situation is that described optical element holding member is not around described optical axis rotation and by linear guide.
Ideal situation is that described driving mechanism comprises motor and reduction gearing gear train.
Obtain the position of optical element control gear according to the present invention, wherein the load variations of the spring of mobile that cause, the optics element-retaining member that is used to setover by the optical element holding member is little, even mechanism can save the mode in space and be configured, and wherein minimize with low-power consumption and reach very high level.
In addition; do not rely on the shape of holding cylindrical parts; bias unit is protected safely; because be installed between holding cylindrical parts and the protective bulkhead parts by the bias unit around the axle swing that is substantially normal to the plane parallel with optical axis, biasing optics element-retaining member, described protective bulkhead parts are the parts that are independent of the holding cylindrical parts.
Description of drawings
Describe the present invention below with reference to accompanying drawing, wherein:
Fig. 1 is a sectional view of having used the zoom lens tube of the mechanism that is used to control position of optical element of the present invention, and Zoom lens barrel is in lens drum and holds state (retracted state fully) among the figure;
Fig. 2 is the sectional view of zoom lens tube that is in the preparation photography state, and wherein the first half of the zoom lens tube that provides of Fig. 2 and Lower Half are represented the Zoom lens barrel that is in wide-angle side and dolly-out,s dolly-back the end respectively;
Fig. 3 is in the front perspective view that lens drum holds the zoom lens tube of state;
Fig. 4 is in the zoom lens tube rear view that lens drum holds state;
Fig. 5 is the front perspective view that is in the zoom lens tube of preparation photography state;
Fig. 6 is the rear view that is in the zoom lens tube of preparation photography state, and wherein the image pick-up device retainer of zoom lens tube is removed;
Fig. 7 is the exploded rear perspective view of zoom lens tube, and wherein the element that is associated with the position control of the 3rd lens combination is removed;
Fig. 8 is the preceding decomposition diagram of the position control mechanism (optical element control gear) that is used for the 3rd lens group frame;
Fig. 9 is the front perspective view of the major part of the 3rd lens group frame and position control mechanism thereof;
Figure 10 is the rear view of the major part of the 3rd lens group frame and position control mechanism thereof;
Figure 11 is the front view of zoom lens tube, mainly shows the 3rd lens group frame and position control mechanism thereof;
Figure 12 is the 3rd lens group frame shown in Figure 11 and the front view of position control mechanism thereof;
Figure 13 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 14 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 15 A and 15B are spring loads change in embodiment illustrated in fig. 13 and the contrast chart between the spring loads change in the comparison example shown in Figure 14, wherein Figure 15 A has provided the yellow loads change of bullet in embodiment illustrated in fig. 13, and Figure 15 B has provided the spring loads change in the comparison example shown in Figure 14;
Figure 16 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 13;
Figure 17 is the front view of second embodiment of position of optical element control gear shown in Figure 16;
Figure 18 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 bar and torsionspring is as the bias unit of the 3rd lens group frame that is used to setover;
Figure 19 is the 3rd lens group frame shown in Figure 180 and the front view of position control mechanism thereof;
Figure 20 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 bar and torsionspring;
Figure 21 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 bar and extension spring is as the bias unit of the 3rd lens group frame that is used to setover;
Figure 22 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 bar and extension spring is as the bias unit of the 3rd lens group frame that is used to setover;
Figure 23 is the rear view of the first embodiment major part of position of optical element control gear, shown protection be used to the to setover embodiment of protection structure of torsionspring of the 3rd lens group frame;
Figure 24 is the expansion planimetric map of the cylindrical part of the frame of first embodiment of position of optical element control gear and cam ring; And
Figure 25 is the expansion planimetric map of another embodiment of the cylindrical part of frame different with structure shown in Figure 24 and cam ring.
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 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. 6,11 and 23, 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 from the mounting portion 22c of AF mechanism below by, and with the axle supported hole 23a (see figure 8) engagement 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.Should anti-engagement of rotating between projection 51e and the straight line guiding groove 22f prevent 51 rotations of the 3rd lens group frame.Thereby the 3rd lens group frame 51 is directed as follows: only can be linear mobile on optical axis direction along the 3rd lens combination guiding leading axle 52, and the 3rd lens group frame 51 can move forward and backward on optical axis direction by 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).As shown in figure 24, in the inner supported mode of cylindrical part 22a, zoom lens tube 1 is equipped among the cylindrical part 22a with cam ring (swivel becket) 11, and cam ring 11 has the annular wheel 11a that meshes with zoom gear 31 in its back-end.Cam ring 11 drives rotation by the engagement of annular wheel 11a and zoom gear 31 by zoom motor 32.Cam ring 11 has one group of three guide protrusion 11b on annular wheel 11a, frame 22 has cam ring control flume (element of swivel becket guide) 22g (seeing Figure 24) on the inner circumferential surface of cylindrical part 22a, wherein one group of three guide protrusion 11b slidably mates respectively in cam ring control flume 22g.Each cam ring control flume 22g is made of guiding groove part 22g-1 and circumferential groove part 22g-2, wherein the relative optical axis O of guiding groove part 22g-1 direction tilts, and circumferential groove part 22g-2 is positioned at before the guiding groove part 22g-1 and by the circumferential parts around optical axis O and constitutes separately.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, by applying moment of torsion to cam ring 11 by zoom motor 32, make cam ring 11 move along optical axis direction when rotating, wherein guide protrusion 11b is guided by the guiding groove part 22g-1 of above-mentioned cam ring control flume 22g respectively.More clearly, when Zoom lens barrel 1 when the lens barrel retracted state enters 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 from wide-angle side state (preparation photography state) when entering 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 22g-2 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.
The straight line guiding bolt 10b (see figure 2) of the straight line guided rings 10 by being positioned at cam ring 11 inside, 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.
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 to be guided point-blank at optical axis direction by 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, thereby improve the accuracy of mesh between each cam follower 8a and relevant second lens control cam path 11c, and each cam follower 12b and the first relevant lens combination are controlled the accuracy of mesh between the cam path 11d.
Below discussion is had the operation of the Zoom lens barrel 1 of above structure.Under the lens barrel retracted state shown in Fig. 1,3 and 4, optical system is shorter than its length under the preparation photography state shown in Fig. 2,5 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, simultaneously with being rotated by the guide protrusion 11b of the guiding groove part 22g-1 guiding of cam ring control flume 22g respectively.Straight line guided rings 10 and first advances lens barrel 13 to move forward point-blank with cam ring 11.By 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 predetermined move mode.In addition, by 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 predetermined move mode, wherein second advances lens barrel 12 to advance lens barrel 13 to be guided point-blank along optical axis direction by 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.By move the first lens combination LG1 and the second lens combination LG2 on optical axis O, 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 circumferential groove part 22g-2 of cam ring control flume 22g of frame 22 respectively, 11 of cam rings are carried out said fixing position rotating operation, therefore neither move forward also at optical axis direction and 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 the 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 enters 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 first lens combination LG1 that carries out by zoom motor 32 and the driving operation 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 obtains by the distance measuring equipment (not providing) that provides in the camera that Zoom lens barrel 1 for example has been installed, carry out focusing operation by 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 mentioned above, form the AF mounting portion 22c of mechanism on frame 22, be located at the outside of cylindrical part 22a, and form front wall section 22d on frame 22, it is also relative with it before to be located at the mounting portion 22c of AF mechanism.Therefore AF motor 30 is fixed on by fixed screw 33 before the mounting portion 22c of AF mechanism, is fixed on pinion wheel 30a on the turning axle of AF motor 30 from the outstanding backward (see figure 6) in the rear surface of the mounting portion 22c of AF mechanism.Be supported on the rear 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 (element of screw shaft/driving mechanism) 36.The rotation of the turning axle of AF motor 30 is transmitted to screw 36 by 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 the front-axle hole and back axis hole 23b (see figure 8) 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 (element of driving mechanism) 37 of 36 one-tenth screw engages of screw is installed in nut butted part 51f.By the engagement between the anti-rotation projection 51g (referring to Fig. 8 and Fig. 9) 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.Cause AF nut 37 to move forward and backward, and do not rotate with screw 36 along the direction parallel with optical axis O forward and the screw 36 that rotates backward.The 3rd lens group frame 51 provides the vertical wall segments 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 (giving prominence to) 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, for the 3rd lens group frame 51 provides bias force.Torsionspring 38 has coiling part (oscillation centre part) 38a.Coiling part 38a is supported by spring supporting projections (the swinging mobile 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 the axle edge of spring supporting projections 22j and the vertical substantially direction extension of the vertical plane P1 that is parallel to optical axis O (see Figure 11 and 23, vertical plane P1 comprises optical axis O).The coiling part 38a of torsionspring 38 remains on the cylindrical outer surface of spring supporting projections 22j, and by tighten fixed screw 39 in the screw that is formed centrally in passing spring supporting projections 22j, 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.
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 13 of bias arm part 38c extended vertically downward, shown in the double dot dash line part of Reference numeral 38c (F) mark among Figure 13.From then on state, 38c (F) among the relative Figure 13 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 rear surface of the carbine 51h of optical axis direction, the elastic deformation of torsionspring 38 (distortion) amount increases, the elastic force of torsionspring 38 is as the lotus that is carried on the carbine 51h, makes bias arm part 38c along optical axis direction extrusion spring hook 51h forward.Just, torsionspring 38 enters application of force state, and wherein torsionspring 38 imposes on the 3rd lens group frame 51 along optical axis direction bias force forward by bias arm part 38c.
So, impose the 3rd lens group frame 51 of bias force forward along optical axis direction,, prevented to move forward by docking of nut butted part 51f and AF nut 37 by curved spring 38.That is to say that shown in Fig. 9,10 and 13, the 3rd lens group frame 51 keeps by 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.Because by forward and the pinion wheel 30a of AF motor 30 of rotating backward, AF nut 37 moves forward and backward along being parallel to optical axis O direction by 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 by 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.
The 3rd lens group frame 51, is provided by solid line in Figure 13 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 13.Figure 15 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 13) 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.As shown in figure 13, 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 more much smaller to the minimum swash angle θ min that torsionspring 38 enters application of force state 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 14 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 of Yi Donging is represented by solid line and double dot dash line respectively with the boundary that moves forward backward.In addition, in Figure 14, with 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 the longest (Lmax).Lf shown in Figure 14 has pointed out the length of extension spring 38 ' when being in free state.
Figure 15 B has provided in the comparative examples shown in Figure 14, extension spring 38 ' loads change.Spring load when the Fmin ' expression extension spring 38 ' length among Figure 15 B is Lmin, the spring load when Fmax ' the expression extension spring 38 ' length among Figure 15 B is Lmax.As can be seen from Figure 14, 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 from length L f (extension spring 38 ' when being in free state length) to extension spring 38 ' the displacement Lv1 that enters application of force state is much bigger.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, with adopt the extension spring that has longer length in free state 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 14 provides and embodiment shown in Figure 13 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 substantially) of the Zoom lens barrel front end that is in retracted state (right-hand side among Figure 14) 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 14 ' be given the structurally possible maximum length of Zoom lens barrel, therefore, keeping Zoom lens barrel under the situation of the current size under the retracted state, be difficult to loads change is reduced to than the littler degree shown in Figure 15 B, therefore 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 14), 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 14 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, but the comparison of the loads change of torsionspring 38 is more much smaller than the loads change in the example, the peak load of spring is also compared littler than the peak load in the example, can understand by the contrast between the chart among Figure 15 A and the 15B.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 mentioned above, in torsionspring 38, under the application of force state between boundary and the mobile backward boundary of moving forward of the 3rd lens group frame 51, bias arm part 38c angular displacement (θ v) than scope for 38 to enter the minimum wobble angle (θ min) of bias arm part 38c of application of force state littler from its free state to torsionspring, and the expression formula that satisfies condition " θ v/ θ min＜1 ", this makes that loads change minimizes under the application of force state.In the embodiment shown in fig. 13, although the angle θ min of minimum swash angle is set near half-turn, but by 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 the peak load of torsionspring 38 and the minimum load.Although, suppressed loads change significantly, if the expression formula that satisfies condition " θ v/ θ min＜0.5 " can obtain better effect by the expression formula that satisfies condition " θ v/ θ min＜1 ".As the practical technique that increases minimum swash angle θ min value, bias arm part 38c can be turned round around coiling part 38a (centering on balance staff 38x) from the free state of bias arm part 38c three-sixth turn or 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 from its free state to torsionspring 38 enter application of force state) 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 38a 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, then bias arm part 38c is hooked in carbine 51h on the 3rd lens group frame 51 and is positioned at zone on the surface level P2, shown in Figure 11 and 23.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 in 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.As shown in figure 11, 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 and 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 will be used for controlling the position control mechanism of the 3rd lens combination frame 51 effectively, is contained in the quiet space that forms between the peripheral surface of the rectangle rack section of camera and cylindrical frame part 22a.In addition, as shown in figure 11, 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 mentioned above, in the foregoing description of position of optical element control gear, mechanism by torsionspring 38 biasing 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 with reference to Figure 16 and 17, discuss second embodiment of position of optical element control gear of the present invention.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 (element/guide member of driving mechanism) 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 substantially with respect to optical axis O.Directing pin (element of driving mechanism/follow part) 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 thereon.Drive cam axle 136 has gear 135 at the one end.Motor (element of driving mechanism) 130 applies moment of torsion by 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 sliding on the guiding surface of a pair of axial opposed of guiding groove 136a, 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 (swinging mobile support component) 122j, coiling part (oscillation centre 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 substantially 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 16 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 to produce on cylindrical part 151a 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 by 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 load on the motor 130.In addition, similar to 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 in the mode of saving the space.In addition, can know from second embodiment shown in Figure 16 and 17, the application of bias unit on the optical element holding member among the present invention, be not limited to the directly related application of driving operation among first embodiment and the forward/back moving-member, 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 employing groove of above-mentioned use as the combination of guiding groove 136 and directing pin 151b and the ad hoc structure of the combination of projection; 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 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 of independent torsionspring is to be used to setover the bias unit of lens-mount 151.Yet, if bias unit satisfies bias unit by can apply the requirement of bias force around the force part (arm) of axis of swing (vertical substantially with the optical axis of the optical element that is kept by the optical element holding member) swing to optical element holding member (51 or 151), then bias unit is not limited to so independent torsionspring.
Below with reference to Figure 18 to 22, discuss the 3rd to the 5th embodiment of the position of optical element control gear that adopts different bias units.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 to first embodiment of position of optical element control gear represented with identical Reference numeral, and gives identical name of parts.
At Figure 18 in the 3rd embodiment shown in Figure 20, 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 (swinging mobile support section/oscillation centre part) 22m, from frame 22 laterally projecting (direction that the axle edge of feasible swing supporting projections 22m and vertical plane P1 are vertical is substantially extended), swing arm 70 has axis hole 70a at the one end, swing supporting projections 22m inserts wherein, make 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 20, support arm portion (second arm portion of bar bias component) 238b and bias arm part (the first arm part of bar bias component) 238c are hooked on respectively on fixed projection (carbine part) 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 by 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 by 238 pairs of swing arms 70 of torsionspring, the bias arm part 238c of torsionspring 238 and the combination of swing arm 70, realize to swing 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 in the mode of saving the space, also can reduce load on the AF motor 30 by reducing under the application of force state loads change to the 3rd lens group frame 51.Different with the 3rd embodiment, the support section that can make the coiling part 238a of torsionspring 238 be different from the swing supporting projections 22m of swing arm 70 supports.
Except that be stretched spring (bar bias component) 338 of torsionspring 238 replaces the bias component of the swing arm 70 that adopts as the 3rd embodiment that is used for setovering, the 4th embodiment shown in Figure 21 is similar to the 3rd embodiment shown in Figure 18 to 20.Swing arm 70 has principal arm 70b, principal arm 70b extends along the direction that the bar engagement projections 51j with the 3rd lens group frame 51 meshes from swing arm 70 rotating parts (axis hole 70a), swing arm 70 further has carbine arm (carbine part) 70c, and carbine arm 70c extends along the direction opposite substantially with the bearing of trend of principal arm 70b from the rotating part (axis hole 70a) of spring lever 70.The direction that extension spring 338 makes its edge be basically parallel to optical axis O is installed extends, 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 D 1 from axis of swing 70x to swing arm the mate E1 70 and bar engagement projections 51j engagement is than the distance D 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 structure 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 principal arm 70b of every Moving Unit correspondence of optical axis direction.Therefore, by contrasting Figure 14 and Figure 21 as can be known, under application of force state to the 3rd lens group frame 51, displacement Lv3 between the minimum length Lmin of extension spring 338 and the maximum length Lmax, littler than the displacement Lv2 in the comparison example shown in Figure 14, therefore loads change can be reduced to than using 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 load on the AF motor 30 by reducing peak load like this.
Extension spring 338 in the 4th embodiment was replaced by the extension spring (bar bias component) different with the draw direction of extension spring 338 438, the 5th embodiment shown in Figure 22 was similar to the 4th embodiment shown in Figure 21.Swing arm 70 has from the outstanding spring structure arm 70d of the rotating part of swing arm 70 (axis hole 70a), and its projected direction is vertical substantially with the bearing of trend of principal arm 70b, promptly meets at right angles substantially with principal arm 70b.Extension spring 438 is installed is made its edge vertical substantially 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 D 1 of and mate E1 bar engagement projections 51j engagement 70 from axis of swing 70x to swing arm, than the distance D 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 along optical axis direction forward and when mobile 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 adopting 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 load on the AF motor 30 by reducing peak load like this.
In the 4th embodiment, it is desirable to expression formula: the D2＜D1/2 that meets the following conditions of the ratio between the length (D2) of the length (D1) of the principal arm 70b of swing arm 70 and spring structure arm 70c.Similarly, in the 5th embodiment, it is desirable to expression formula: the D3＜D1/2 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.
From the 4th and the 5th embodiment as can be known, by 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 by the structure of compact design on optical axis direction, even if adopt extension spring to replace torsionspring in axial tension and contraction.Viewpoint thus even if replace extension spring 338 or 438 among the 4th or the 5th embodiment by the bias unit that constitutes by compression spring and swing arm, also can obtain similar effect.
Though the support arm portion 38b of the torsionspring 38 in first embodiment, the support arm portion 238b of the torsionspring 238 in the 3rd embodiment, and the 4th and the 5th among the embodiment each extension spring 338 and in 438 the end each and be formed on projection (22k on the frame 22,122k, 22n, 22p or 22q) engagement, the parts that form projection in the above are not limited only to for example fixed part of frame 22, also can be moving-member, so long as form the parts of projection thereon and change corresponding to the relative position on optical axis direction between the optical element holding member of the 3rd lens group frame 51 at least.Similarly, the support component of the dwang parts 70 in the 3rd to the 5th embodiment is not limited only to the fixed part such as frame 22, also can be moving-member, so long as at the parts that rotate this rod unit with change corresponding to the relative position between the optical element holding member of the 3rd lens group frame 51 at least.
In the bias unit in the embodiment of each above-mentioned zoom lens tube, along with from the axis of swing to the force part to the increase of the distance of optical element holding member, the effect that reduces the load variations of bias unit also increases thereupon.Yet the increase distance has been brought the increase of the length of force part, thereby has increased the possibility of other parts of force part interference lens drum.Therefore, bias unit need be installed in the radial outside part of lens drum, rather than the radial center part of moving-member dense arrangement.Yet; if bias unit is installed in the radial outside part of lens drum; the bias unit that needs protection so is because bias unit is caused the chance that the chance of being out of shape and positional fault take place to increase greatly by the element in zone in its vicinity from outside contact bias device.Yet the frame that is difficult to the scioptics tube is sometimes protected bias unit.
For example; in first embodiment of optical element maintaining body; by prolonging bias arm part 38c and torsionspring 38 being placed outside the cylindrical part 22a of frame 22; can obtain reducing the effect of the load variations of bias unit; even as shown in Figure 6, frame 22 is not protected torsionspring 38.As shown in figure 24, one group three cam ring control flume 22g are formed on the inner circumferential surface of cylindrical part 22a of frame 22, almost on its whole circumference scope.Because this structure, cylindrical part 22a need be complete right cylinder, does not have the part of disappearance on its circumferencial direction.Though frame 22 is moulded products of synthetic resin, in manufacture process, be difficult to frame 22 is made the frame with double-walled construction, wherein said frame further comprises the wall part of the radial outside that is positioned at cylindrical part 22a, thereby covers torsionspring 38.In particular, for moulding cylindrical part 22a, after cylindrical part 22a is molded, casting die mould is removed away from optical axis O in the radial outside direction, thereby in general, frame 22 with wall part can not be provided, this wall part 22 by moulding to cover torsionspring 38 radially removing on the path of casting die mould.
In order to protect torsionspring 38 in this case, in zoom lens tube 1, the image pick-up device retainer 23 that is fixed on frame 22 back is equipped with protective bulkhead part (protective bulkhead parts) 23c that covers torsionspring 38 outsides.Shown in Fig. 4,7,8 and 23, protective bulkhead part 23c is equipped with flat sidewall sections (plate shape part) 23d and box-like part 23e.Sidewall sections 23d is arranged essentially parallel to the swaying direction (swinging plane) of the bias arm part 38c of torsionspring 38, and box-like part 23e is positioned at the position around the coiling part 38a of torsionspring 38, and described torsionspring 38 is positioned under the sidewall sections 23d.The forward position contact front wall section 22d of protective bulkhead part 23c, the side of box-like part 23e is along the lower support section 22r of contact.Front wall section 22d and lower support section 22r be equipped with by moulding with respectively with the above-mentioned forward position of protective bulkhead part 23c and above-mentioned side step portion 22d-1 and step portion 22r-1 along engagement.As shown in Figure 8; protective bulkhead part 23c is provided at the inner surface of sidewall sections 23d; wherein said sidewall sections 23d has optical axis direction groove 23f, and described sidewall sections 23d prevents that when the 3rd lens group frame 51 moves described protective bulkhead part 23c from avoiding disturbing spring structure 51h.In addition, protective bulkhead part 23c equipment is in close proximity to have sensor accommodating portion and divides after the optical axis direction groove 23f of 23g, divides in sensor accommodating portion and holds origin position sensor 40 among the 23g.
When image pick-up device retainer 23 is fixed on the frame 22, image pick-up device retainer 23 slides forward on frame 22, and the side of box-like part 23e is slidably supported along the step portion 22r-1 by lower support section 22r.Subsequently, on image pick-up device retainer 23 and major part that the rear surface of frame 22 contacts, the forward position of protective bulkhead part 23c also contacts front wall section 22d and meshes with step portion 22d-1.So, as shown in Figure 4, being fixed on the frame 22 by image pick-up device retainer 23 being utilized a series of screw rods, protective bulkhead part 23c has covered the outside of torsionspring 38 fully, thus zoom lens tube 1 is in protected state.At this protected state; as shown in figure 23; torsionspring 38 remains among the space Q between the protective bulkhead part 23c of the external peripheral surface of cylindrical part 22a of frame 22 and image pick-up device retainer 23; and do not contact the movable part of zoom lens tube 1 inboard and the outside that does not further contact zoom lens tube 1 from outer protection torsionspring 38 by protective bulkhead part 23c by cylindrical part 22a protection torsionspring 38.Like this, torsionspring 38 (particularly bias arm part 38c) can not be by irreversibly type change, promptly be different from by other parts of contact zoom lens tube 1 or assembling workman's hand elastic type variable during normal use, thereby work as zoom lens tube 1 at assembled state, the accuracy of the position control of the 3rd lens group frame 51 can be not destroyed.
In this case; because the image pick-up device retainer 23 that is fixed on the frame 22 is equipped with protective bulkhead part 23c; this protective bulkhead part 23c covers the outside of torsionspring 38 when image pick-up device retainer 23 is fixed on state on the frame 22, the torsionspring 38 that therefore is positioned at frame 22 outsides can be protected not to be damaged.Particularly; the bias unit that is used to protect torsionspring 38 not to be damaged is protected structure; under the situation of the restriction of the shape that is not subjected to frame 22; on the ability of reliably protecting torsionspring 38, give prominence to, even be difficult to by plastic pattern in the structure of the wall part of the outside of cylindrical part 22a formation covering torsionspring 38.In frame 22; each of front wall section 22d and lower support section 22r all is the dish shape part of stretching out from the outer circumference surface of cylindrical part 22a; and can be by drawing and the equidirectional mold of spring supporting projections 22j is molded; wherein front wall section 22d and lower support section 22r both are made into contact protection wall part 23c; thereby can be molded as the part of frame 22, and unlike protective bulkhead part 23c.
Though the torsionspring 38 of first embodiment is represented as the element that the protective bulkhead part 23c by image pick-up device retainer 23 protects in the foregoing description, be to use the bias unit protection structure of protective bulkhead part 23c can be applied to bias unit among above-mentioned other embodiment.If some things externally touch swing arm 70; the swing arm 70 of each all has the bias arm part 38c that is compared to torsionspring 38 and is difficult for the advantage that type becomes among the 3rd to the 5th embodiment; hence one can see that; particularly when bias unit was torsionspring, it was effective that bias unit protection structure is used protective bulkhead part 23c.
In addition; though Figure 24 has shown lens drum that a class makes cam ring 11 move along optical axis direction through the guiding groove part 22g-1 of the cam ring control flume 22g structure of advancing; this cam ring control flume 22g is formed on the inner circumferential surface of cylindrical part 22a of frame 22, also is effective according to the application's bias unit protection structure for the lens drum of as shown in figure 25 the use helical structure structure of advancing.Be presented at the cylindrical part 522a of the frame 522 among Figure 25, circumferential surface is equipped with one group of three cam ring guiding groove (element of swivel becket guide) 522b within it.Each cam ring guiding groove 522b is made up of guiding groove part 522b-1 and circumferential groove part 522b-2.Cam ring 511 is equipped on the annular wheel 511a, has one group of three guide hump 511b thereon, and described guide hump 511b meshes with one group three cam ring guiding groove 522b respectively.Different with the advance type of structure of the cam ring shown in Figure 24, when meshing and rotate without the guiding groove part 522b-1 of one group three cam ring guiding groove 522b and the guide protrusion 511b of cam ring 511 through the engagement that is formed on outer vortex (element of the swivel eye guide) 511c that forms on internal helicoid line (element of swivel becket guide) 522c and the gear teeth at the annular wheel 511a of cam ring 511 on the inner circumferential surface of cylindrical part 522a, cam ring 511 advances on optical axis direction and bounces back.Advance to the extreme position that it moves forward on the optical axis direction at cam ring 511 via the engagement of outer vortex 511c and inner vortex 522c, outer vortex 511c and inner vortex 522c break away from each other, and one group of three guide protrusion 511b respectively with one group three the circumferential groove part 522b-2 engagements of one group three cam ring guiding groove 522b.Then, the fixed position rotation of cam ring 511 on optical axis direction promptly do not moved on optical axis direction.In cam ring shown in Figure 25 advances the type of structure; still effective with the akin bias unit protection structure shown in Figure 23, because the cylindrical part 522a of frame 522 is in order to control the part that does not have disappearance to form complete right cylinder in a circumferential direction that moves of cam ring 511.
Though discussed according to the abovementioned embodiments of the present invention with reference to the accompanying drawings, the present invention is not limited in these embodiment.For example, though the optical element that moves forward and backward on optical axis direction is to be used for the lens combination that focuses at the embodiment that is showed, the present invention also can be applied to not to be the position control mechanism of position control of the optical element of the lens combination that is used to focus on.
In addition, though the bias unit in each the foregoing description is applied on the optical axis direction forward bias force for the optical element holding member, the invention is not restricted to the specific biased direction of described bias unit.That is to say that bias unit can be the type that applies bias force backward on optical axis direction, promptly reverse direction with the direction of optical element holding member.
In addition; though in above-mentioned the first, the 3rd, the 4th and the 5th embodiment; the spring supporting projections 22j and the swing supporting projections 22m that support torsionspring 38 and swing arm 70 respectively are formed on the cylindrical part 22a of frame 22, also can form similar tilting member supporting projections on the protective bulkhead part 23c of image pick-up device retainer 23.
Can carry out different variations in the specific embodiment of the present invention described here, such modification is in the middle of the spirit and protection domain of appended claims of the present invention.It is pointed out that all the elements that comprise all are illustrative here, but not be used to limit protection scope of the present invention.
Claims (17)
1. position of optical element control gear comprises:
The optical element holding member, it supports the optical element of photographic optical system and is directed on optical axis direction;
Driving mechanism, it is used for moving described optical element holding member on described optical axis direction;
Bias unit, it comprises can be around the arm of axis of swing swing, described axis of swing basically with described light shaft positive cross, and described arm extend with described axis of swing quadrature basically and have with described optical element holding member engagement with free end portion at the described optical element holding member of described optical axis direction upper offset;
Swivel becket, by rotating described swivel becket, described swivel becket moves the optical element that at least one and described optical element in the described photographic optical system independently provide; And
The holding cylindrical part, it is around described photographic optical system, and described bias unit is placed outside the described holding cylindrical part;
Wherein said driving mechanism and described bias unit are positioned at the radial outside of described swivel becket;
Wherein said holding cylindrical partly comprises the swivel becket guide, it is equipped on the inner circumferential surface of described holding cylindrical part, almost on the whole circumference scope of described holding cylindrical part, be used for guiding rotationally swivel becket, and be positioned at described holding cylindrical inside partly, thereby control the position of described swivel becket on described optical axis direction.
2. position of optical element control gear as claimed in claim 1, wherein said bias unit comprises torsionspring, described torsionspring comprises:
The coiling part, it is by separating the supporting units support that provides with described optical element holding member, and the central shaft of described coiling part is consistent basically with described axis of swing;
The first arm part, it constitutes described arm and extends radially outwardly from the described coiling part in its free end portion and the engagement of optical element holding member;
Second arm portion, it extends radially outwardly from the described coiling part with described support component engagement;
Wherein according to the motion of described optical element holding member, described torsionspring changes its elastically-deformable amount around the described central shaft of described coiling part on the rotation direction of described torsionspring.
3. position of optical element control gear as claimed in claim 2, wherein from the amount of described the first arm free state partly up to the angular displacement of described the first arm part on its rotation direction that partly enters application of force state when described the first arm, greater than being in the moving forward between the limit and the mobile backward limit of described optical element holding member under the application of force state, the amount of the angular displacement of described the first arm part on its rotation direction, wherein, under the free state of described the first arm part, described the first arm part and described optical element holding member are thrown off, partly enter under the application of force state described the first arm part and the engagement of described optical element holding member at the first arm.
4. position of optical element control gear as claimed in claim 1, the described arm of wherein said bias unit comprises bar, one end of its king-rod rotates separating on the support component that provides with described optical element holding member, the other end of bar and the engagement of described optical element holding member; And
Wherein said bias unit comprises and being used for around the bar bias component of described axis of swing at forward or backwards the described bar of rotation direction upper offset.
5. position of optical element control gear as claimed in claim 4, wherein said bar bias component comprises torsionspring, described torsionspring comprises:
By the coiling part of described supporting units support, the central shaft of described coiling part is consistent with described axis of swing basically;
The first arm part, it extends from described coiling part outward radial, thereby meshes with described bar; And
Second arm portion, it extends from described coiling part outward radial, thereby partly meshes with the carbine of described support component,
Wherein move according to the swing of described bar, on the central shaft of described coiling part, rotation direction at described torsionspring, described torsionspring changes its elastically-deformable amount.
6. position of optical element control gear as claimed in claim 4, wherein said bar bias component comprises extension spring, one end of described extension spring and the other end mesh with described bar and described support component respectively, and the length of described extension spring moves according to the swing of described bar and changes.
7. position of optical element control gear as claimed in claim 6, wherein from described axis of swing to described extension spring and the distance the mate of described bar engagement less than the distance the mate that meshes with described optical element holding member from described axis of swing to described bar.
8. position of optical element control gear as claimed in claim 1, the described free end portion of the described arm of wherein said axis of swing and described bias unit is positioned at the described swivel becket outside, respectively among both of two spaces that provide in the both sides, plane, the substantially parallel described axis of swing in described plane and on described optical axis.
9. position of optical element control gear as claimed in claim 1, wherein said driving mechanism comprises:
Screw shaft, it is being parallel to rotation on the axle of described optical axis; And
Nut, itself and described screw shaft luer engages with, and by described screw shaft forward and rotate backward and on described optical axis direction, move forward and backward,
Wherein contact with described optical element holding member and determine the position of described optical element holding member on described optical axis direction by described nut, and
Wherein said bias unit contacts the described optical element holding member of direction upper offset of described nut at the described optical element holding member of guiding.
10. position of optical element control gear as claimed in claim 1, wherein said driving mechanism comprises:
Guide member, it comprises at least one guiding surface, the described relatively optical axis direction of described guiding surface tilts; And
Follow part, it is outstanding sliding at described guiding surface from described optical element holding member,
The wherein said bias force of part by described bias unit of following is pressed on the guiding surface of described guide member.
11. position of optical element control gear as claimed in claim 10, wherein said guide member is included in the cam lever that extends on the optical axis direction,
Wherein guiding groove is as cam path, can be meshed slidably following part described in this cam path, and this guiding groove is formed on the circumferential surface of described cam lever, and
Wherein said guiding surface is positioned at the inside of described guiding groove.
12. position of optical element control gear as claimed in claim 1 further comprises:
The protective bulkhead parts; its as with described holding cylindrical part element and being provided independently mutually; and be fixed on the described holding cylindrical part; with the external peripheral surface that produces described holding cylindrical part and the spatial accommodation between the described protective bulkhead parts, described bias unit is housed inside in the described spatial accommodation.
13. position of optical element control gear as claimed in claim 12, wherein said photographic optical system further comprises image pick-up device; And
Wherein said protective bulkhead parts and image pick-up device retainer are one, and described image pick-up device retainer keeps described image pick-up device, form the position thereby described image pick-up device is in image.
14. position of optical element control gear as claimed in claim 12; one of wherein said holding cylindrical part and described protective bulkhead parts comprise the mobile supporting projections of swing; the mobile supporting projections of described swing supports the oscillation centre part of described bias unit, thereby allows described arm to move around described axis of swing swing.
15. position of optical element control gear as claimed in claim 12, wherein said protective bulkhead parts comprise the sidewall sections that is arranged essentially parallel to swinging plane, swing around described axis of swing at the arm of bias unit described in the described swinging plane.
16. position of optical element control gear as claimed in claim 1, wherein said optical element holding member are not around described optical axis rotation and by linear guide.
17. position of optical element control gear as claimed in claim 1, wherein said driving mechanism comprise motor and reduction gearing gear train.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007291656A JP4937883B2 (en) | 2007-11-09 | 2007-11-09 | Optical element position control mechanism |
| JP2007-291656 | 2007-11-09 | ||
| JP2007291656 | 2007-11-09 | ||
| JP2008174689A JP5090274B2 (en) | 2008-07-03 | 2008-07-03 | Lens barrel |
| JP2008-174689 | 2008-07-03 | ||
| JP2008174689 | 2008-07-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101430414A CN101430414A (en) | 2009-05-13 |
| CN101430414B true CN101430414B (en) | 2013-07-24 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810175556 Expired - Fee Related CN101430414B (en) | 2007-11-09 | 2008-11-07 | Mechanism for controlling position of optical element |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4937883B2 (en) |
| CN (1) | CN101430414B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5361566B2 (en) * | 2009-06-24 | 2013-12-04 | キヤノン株式会社 | Lens barrel and imaging device |
| WO2011087018A1 (en) * | 2010-01-12 | 2011-07-21 | 京セラ株式会社 | Acoustic wave device |
| EP3731389B1 (en) * | 2012-05-09 | 2023-07-19 | LG Innotek Co., Ltd. | Voice coil motor |
| JP6207188B2 (en) * | 2013-03-21 | 2017-10-04 | キヤノン株式会社 | Imaging device |
| JP6198616B2 (en) * | 2014-01-22 | 2017-09-20 | Hoya株式会社 | Lens barrel |
| US11262645B2 (en) * | 2018-08-31 | 2022-03-01 | Sony Corporation | Lens shift mechanism and projection display apparatus |
| JP2021081486A (en) * | 2019-11-15 | 2021-05-27 | 株式会社シグマ | Lens device |
| JP7381066B2 (en) * | 2019-11-15 | 2023-11-15 | 株式会社シグマ | lens device |
| CN111580323B (en) * | 2020-06-04 | 2021-07-20 | 泰州亚泰金属有限公司 | Adjustable paraxial viewfinder |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05203858A (en) * | 1992-01-24 | 1993-08-13 | Canon Inc | Lens barrel driving device |
| JPH0868930A (en) * | 1994-08-29 | 1996-03-12 | Fuji Photo Film Co Ltd | Lens barrel |
| JP4171318B2 (en) * | 2003-02-10 | 2008-10-22 | Ｈｏｙａ株式会社 | Lens group guide structure and viewfinder structure |
| JP4647958B2 (en) * | 2004-08-31 | 2011-03-09 | Ｈｏｙａ株式会社 | Zoom lens barrel drive mechanism |
| JP4699126B2 (en) * | 2005-07-28 | 2011-06-08 | 日本電産コパル株式会社 | Lens drive device |
-
2007
- 2007-11-09 JP JP2007291656A patent/JP4937883B2/en not_active Expired - Fee Related
-
2008
- 2008-11-07 CN CN 200810175556 patent/CN101430414B/en not_active Expired - Fee Related
Non-Patent Citations (3)
| Title |
|---|
| JP特开2004-240360A 2004.08.26 |
| JP特开2007-33961A 2007.02.08 |
| JP特开平8-68930A 1996.03.12 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101430414A (en) | 2009-05-13 |
| JP2009116222A (en) | 2009-05-28 |
| JP4937883B2 (en) | 2012-05-23 |
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