CN2802532Y - Variable-focus optical device - Google Patents
Variable-focus optical device Download PDFInfo
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- CN2802532Y CN2802532Y CN 200420005827 CN200420005827U CN2802532Y CN 2802532 Y CN2802532 Y CN 2802532Y CN 200420005827 CN200420005827 CN 200420005827 CN 200420005827 U CN200420005827 U CN 200420005827U CN 2802532 Y CN2802532 Y CN 2802532Y
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Abstract
The utility model relates to a variable focus viewfinder which is provided with a first cam (14) and a second cam (15) which are used for driving a first variable focus lens frame (1) and a second variable focus lens frame (19) in an advance and retreat way and are jointed with cam components. The first cam and the second cam are rotatablely and freely supported on a driving shaft (11) under the state of mutual combination; the first variable focus lens frame and the second variable focus lens frame are freely supported on a guiding shaft (20) in a sliding way, and are driven through the first cam (14) and the second cam (15) in the advance and retreat way. A force application spring (21) for lenses is installed between the first variable focus lens frame and the second variable focus lens frame, and hook parts (21a, 21b) of the force application spring (21) incline outwards under the free state of the spring. The first variable focus lens frame and the second variable focus lens frame for hanging the hook parts are supported to incline outwards, which is equal to the state of the gap part between the first and the second variable focus lens frames and the guiding shaft, and the first variable focus lens frame and the second variable focus lens frame can slide on the guiding shaft without looseness. Thus, the utility model can achieve the effects of less space occupation and miniaturization, and the phenomenon of looseness of each variable focus lens can be effectively removed.
Description
Technical field
The utility model relates to the structure of Varifocus optical apparatus.
Background technology
As a kind of Varifocus optical apparatus of camera in the past, for example, the zoom ratio interlock that Zoom finder constitutes with photographic lens makes the zoom lens in the view finder move to assigned position.That is, the zoom lens of above-mentioned view finder have more than 2 usually, and the multi-disc lens combination moves to each zoom position corresponding with the zoom position of photographic lens along lens directs portion.In Zoom finder, be provided with the part of above-mentioned zoom lens and contact, and be used to shift position exchange cam that these lens are moved.And, in order to eliminate above-mentioned zoom lens the becoming flexible on moving direction (optical axis direction) that contacts with above-mentioned exchange cam, to becoming a pair of above-mentioned zoom lens, near lens directs portion, hang the lens force application spring of above-mentioned zoom lens to the moving direction application of force.In addition, on above-mentioned zoom lens, be provided with the rotation stop component that limits around the rotation of said lens guide portion.
Except above-mentioned optical axis direction loosening, also there be the loosening of 3 directions in loosening as the zoom lens of above-mentioned view finder.Now, suppose that optical axis direction (lens directs direction) is the Z axle, the axle of above-below direction is a Y-axis, the axle of left and right directions is an X-axis, then the lens deviations by the loosening generation that centers on the Z axle is called off-centre, calling driftage and shake (level is shaken), call pitch and shake (crooked shaking) becoming flexible around the rotation of X-axis around the rotation of Y-axis is loosening.In order to ensure the quality of image of view finder, particularly the quality of image of the view finder in the zoom action must be removed above-mentioned off-centre and various loosening.
Above-mentioned pitch is shaken and driftage to shake mainly be owing to existing certain clearance to take place at lens bearing (fitting portion) and lens directs portion.For the gap of above-mentioned bearing (fitting portion) and lens directs portion, must guarantee the specified gap that adaptive temperature changes.And,,, can increase above-mentioned shaking quantity yet shorten although be necessary further to shorten above-mentioned bearing from the miniaturization viewpoint.And above-mentioned off-centre is the precision of corresponding above-mentioned rotation stop component and taking place.Effectively eliminate these eccentric and loosening motions as being used for, the view finder adjusting mechanism that discloses in patent documentation 1 has adopted by the said lens force application spring being configured to tilt to optical axis direction, also can remove the structure that pitch is shaken.And the view finder mechanism of the camera that discloses in patent documentation 2 has the two ends of said lens force application spring as arm, lens is abutted against on the circumference of guide portion, suppresses the structure because of the loosening off-centre that causes of lens thus.
[patent documentation 1]
Patent documentation 1 is patent disclosure communique 2002-62562 number.
[patent documentation 2]
But, in the view finder adjusting mechanism of above-mentioned patent documentation 1, can not remove eccentricity removal and driftage and shake.And, loosening in order to eliminate lens, use the structure of spring superconducting tilting suspension on lens, it is big to occupy the space, exists the problem of the miniaturization that is difficult to realize view finder mechanism.
On the other hand, in the view finder mechanism of patent documentation 2,, shake yet can not remove to go off course to shake with pitch although can suppress lens off-centre.And, since be by be used to make lens optical axis direction away from helical spring revolving force at torsional direction, form the power of removing lens off-centre, thus can not with power independently set make lens on optical axis direction away from power and remove the power of said lens off-centre.Therefore, also exist the problem of the acting force that is difficult to set correct amount.
The utility model content
The utility model is in view of the above problems and proposes, and the purpose of this utility model provides a kind ofly occupies that the space is few, Miniaturizable, and can effectively remove the loosening Varifocus optical apparatus of zoom lens.
1 the Varifocus optical apparatus of the utility model has: 1 set vari-focus lens is used for moving assigned position by cam part at optical axis direction; Leading axle is used to support above-mentioned zoom lens and moves freely at optical axis direction; Fitting portion, it is arranged on above-mentioned 1 set vari-focus lens, has the embedded hole that makes above-mentioned leading axle chimeric; And volute spring, it is arranged to be clipped between the above-mentioned embedded hole and is wound on the above-mentioned leading axle, and to the above-mentioned 1 set vari-focus lens application of force, make its optical axis direction mutually near or away from, be formed with button respectively at above-mentioned helical spring two ends and be stuck in button card division on the above-mentioned fitting portion, above-mentioned button card division is formed under the spring free state from the position of volute spring end face to the displacement of spiral axis direction, so that apply separately reciprocal each other moment with the axle system of optical axis direction quadrature to above-mentioned fitting portion.
As mentioned above, according to the utility model, owing to only use volute spring, just can prevent the off-centre of zoom lens and shake loosening generation, thereby there is no need to append the parts of the special purpose spring of eliminating loosening usefulness etc., still keep miniaturization with regard to observing stable image, thereby the Varifocus optical apparatus of the few Miniaturizable of a kind of necessary configuration space can be provided.
Description of drawings
Fig. 1 is the figure of expression as the summary configuration of the Zoom finder of the Varifocus optical apparatus of the utility model one embodiment, and is the pattern stereographic map from the Zoom finder of bottom surface side observation.
Fig. 2 be from the camera bottom surface side observe above-mentioned Fig. 1 Zoom finder want portion the time exploded perspective view.
Fig. 3 observes the view finder driving mechanism portion of the Zoom finder that constitutes above-mentioned Fig. 2 and the upward view of finder optical system portion from the camera bottom surface side.
Fig. 4 is a stereographic map of observing the finder optical system portion of above-mentioned Fig. 3 from the camera bottom surface side.
Fig. 5 is the stretch-out view of a part of the 1st cam of the view finder driving mechanism portion of above-mentioned Fig. 3.
Fig. 6 is the B-B sectional view of above-mentioned Fig. 5.
Fig. 7 is the stretch-out view of a part of the 2nd cam of the view finder driving mechanism portion of above-mentioned Fig. 3.
Fig. 8 is the C-C sectional view of above-mentioned Fig. 7.
Fig. 9 is the sectional view of cam joint portion of the 1st, the 2nd cam of the view finder driving mechanism portion of above-mentioned Fig. 3.
Figure 10 is the A-A sectional view of Fig. 3, represent the 1st cam of above-mentioned finder optical system portion and each rotation status of drive plate, state when wherein Figure 10 (A) is illustrated in long burnt turned position, state when Figure 10 (B) is illustrated in the wide-angle turned position, Figure 10 (C) expression the 1st cam stops at the wide-angle turned position, and drive plate turns to the state of fold back point correspondence position.
Figure 11 is the figure of free state of lens force application spring of the finder optical system portion of the above-mentioned Fig. 3 of expression.
Figure 12 is the figure of installing state of the lens force application spring of the above-mentioned Figure 11 of expression.
Figure 13 is the figure of active state of power of the lens force application spring of the above-mentioned Figure 11 of expression.
Figure 14 is the figure of expression as the free state of the lens force application spring of the variation of the lens force application spring of the finder optical system portion of above-mentioned Fig. 3.
Figure 15 is the figure of installing state of lens force application spring of the variation of the above-mentioned Figure 14 of expression.
[symbol description]
14b, 15b cam surface (cam part)
18a, 19a axis hole (embedded hole)
18b, 19b zoom lens portion (zoom lens)
18f, 19f shaft sleeve part (fitting portion)
20 leading axles
21,31 lens force application springs (volute spring)
21a, 21b, 31a, 31b hook portion
Embodiment
Below, with reference to the accompanying drawings embodiment of the present utility model is described.
Fig. 1 is the figure of expression as the summary configuration of the Zoom finder of the Varifocus optical apparatus of the utility model one embodiment, and is the pattern stereographic map of observing Zoom finder from bottom surface side.
The Zoom finder 1 of present embodiment is incorporated in the view finder main body 2, and has as shown in Figure 1: object lens 3; The finder optical system portion 6 that can advance and retreat, it is made of the 1st zoom lens frames 18 and the 2nd zoom lens frames 19 that are used to adjust the zoom ratio; Prism 4 is used to make the subject light reflection that is obtained by object lens 3 and shines view finder lens section side; View finder driving mechanism portion 5, being used to make above-mentioned finder optical system portion 6 and photographic lens is that side is advanced and retreat linkedly; And eyepiece 8.
In conjunction with Fig. 2～Figure 13 the above-mentioned view finder driving mechanism portion 5 of the Zoom finder 1 that constitutes present embodiment and the finder optical system portion 6 that can advance and retreat are elaborated.
Fig. 2 be the PB from the camera bottom surface side of Fig. 1 observe above-mentioned Zoom finder want portion the time exploded perspective view.Fig. 3 is from the view finder driving mechanism portion of the above-mentioned Zoom finder of PA observation formation of the camera bottom surface side of Fig. 1 and the upward view of finder optical system portion.Fig. 4 is the stereographic map that the PA from the camera bottom surface side of Fig. 1 observes above-mentioned finder optical system portion.Fig. 5 is the stretch-out view of a part of the 1st cam of view finder driving mechanism portion.Fig. 6 is the B-B sectional view as the Fig. 5 of the figure around the expression cam joint portion.Fig. 7 is the stretch-out view of a part of the 2nd cam of view finder driving mechanism portion.Fig. 8 is the C-C sectional view as the Fig. 7 of the figure around the expression cam joint portion.Fig. 9 is the sectional view of above-mentioned cam joint portion.Figure 10 is the A-A sectional view of Fig. 3, each rotation status of representing above-mentioned the 1st cam and drive plate, state when wherein Figure 10 (A) is illustrated in long burnt position, the state of Figure 10 (B) when being illustrated in wide-angle position, Figure 10 (C) expression the 1st cam stops at wide-angle position, and drive plate rotates to the state of fold back correspondence position.Figure 11 is the figure of free state of the lens force application spring of the above-mentioned finder optical system of expression portion.Figure 12 is the figure of the installing state of expression said lens force application spring.Figure 13 is the figure of active state of the power of expression said lens force application spring.
In addition, in the following description, the optical axis of supposing the Zoom finder optical system is Of, and the axle center of the following driving shaft 11 parallel with optical axis Of is the Z axle, and its direction is the Z direction, and the axle center of following leading axle 20 is a Z ' axle, and its direction is a Z ' direction.And, suppose that with Z axle, a Z ' vertical above-below direction be Y direction or Y ' direction, be directions X or X ' direction with Z axle, a Z ' vertical left and right directions.Wherein, suppose up and down or about with the direction indication on Fig. 2.And the object lens side of supposing optical axis Of is the place ahead, and the eyepiece side is the rear, and the sense of rotation when then sense of rotation is used from forward observation is represented.
The view finder driving mechanism portion 5 that constitutes the Zoom finder 1 of present embodiment drives finder optical system portion 6 advance and retreat with the zoom drive interlock that photograph pusher side photographic lens is, and, in the fold back drive area that above-mentioned photographic lens is, view finder driving mechanism portion can keep the advance and retreat that make view finder varifocal optical system portion 6 and drive the state that stops.And, the cam part that is applied to view finder driving mechanism portion 5 adopt can rotate with the rotational angle of wide region in conjunction with cam structure, so that set the cam pressure angle forr a short time.
Above-mentioned view finder driving mechanism portion 5 as Fig. 2, shown in Figure 3, has: driving shaft 11, as the turning axle that is bearing in by axle on the view finder main body 2; Driven wheel 12 and drive plate 13, it is fixedly supported on the two ends of above-mentioned driving shaft 11; Cam force application spring 17; And the 1st cam 14 and the 2nd cam 15, it can be embedded in the driving shaft 11 with the relative rotation and support thereon, as the cam part that constitutes cylindric cam part.
Above-mentioned driving shaft 11 has at both ends: section is shaft end 11a, the 11b of D word shape, E type annular groove 11c, 11d, and end difference 11e, and be supported on freely on the view finder main body 2 under the state of the Z axle parallel with optical axis Of, rotating.
Above-mentioned driven wheel 12 the front end of driving shaft 11 have can be chimeric D word shape axis hole 12a, rotate driving by not shown gear set and the zoom drive interlock that the fold back that comprises photographic lens system drives.
Above-mentioned drive plate 13 has D word shape axis hole 13a and to the side-prominent driving projection 13b of the 1st cam 14.
Above-mentioned cam force application spring 17 is the spiral fashion torsionsprings that have hook portion 17a, 17b at two ends, also can compress at direction of principal axis.
Above-mentioned the 1st cam 14 is to use the injection molding part of resin etc., has: axis hole 14a, and its rotation is embedded in the driving shaft 11 freely; Cam surface 14b, it is that to have relatively with axis hole 14a be the druum cam face of dip plane of the inclined light shaft in axle center; Cam engagement surface 14c, it forms the composition surface with the 2nd cam 15; In conjunction with recess 14d, it is the part that combines with the 2nd cam 15, is formed for the restriction face that the relative rotation with the 2nd cam 15 is limited; And projection 14e, it is side-prominent to drive plate 13, can contact, separate with the driving projection 13b of drive plate 13, and also can contact with view finder main body side stop component 2a.
The expansion shape of above-mentioned the 1st cam 14 as shown in Figure 5, but when the moulding of the 1st cam 14, be that the stripping direction S along cam surface 14b carries out the demoulding.Therefore, Yi Bian above-mentioned in conjunction with the having at least of recess 14d along the dip plane of above-mentioned stripping direction S, can carry out the above-mentioned demoulding.In addition, above-mentioned cam surface 14b is the cam surface that the cam lever 18c of following the 1st view finder lens frame 18 slips, the parting line when not having moulding on this cam surface.
Above-mentioned the 2nd cam 15 is injection molding parts of resin etc., and has: axis hole 15a, and its rotation is embedded in the driving shaft 11 freely; Cam surface 15b, it is that to have relatively with axis hole 15a be the druum cam face of dip plane of the inclined light shaft in axle center; Cam engagement surface 15c, it forms the composition surface with the 1st cam 14; And in conjunction with protuberance 15d, it is the part that combines with the 1st cam 14, is formed for the restriction face that the relative rotation with the 1st cam 14 is limited.
Fig. 6 represents the section shape in conjunction with recess 14d of above-mentioned the 1st cam 14, and on the other hand, Fig. 8 has represented the section shape in conjunction with protuberance 15d of above-mentioned the 2nd cam 15.Above-mentioned in conjunction with recess 14d with above-mentionedly shown in the sectional view of Fig. 9, carry out chimeric and combination in conjunction with protuberance 15d.
The expansion shape of above-mentioned the 2nd cam 15 as shown in Figure 7, but when the moulding of the 2nd cam 15, carry out the demoulding along the stripping direction S of cam surface 15b.Therefore, Yi Bian above-mentioned in conjunction with the having at least of protuberance 15d along the dip plane of above-mentioned stripping direction S, can carry out the above-mentioned demoulding.In addition, cam surface 15b is the cam surface that the cam lever 19c of following the 2nd view finder lens frame 19 slips, the parting line when not having moulding on this cam surface.
In above-mentioned view finder driving mechanism portion 5, above-mentioned driven wheel 12 is embedded into rotation and is bearing in the shaft end 11b of D word shape section of rearward end of the driving shaft 11 on the view finder main body 2 by axle freely, and the end is with being fixed under the fixing state of E type back-up ring.At its front side, the 2nd cam 15 rotations that contact with end difference 11e embed freely, and in its place ahead, 14 rotations of the 1st cam embed freely.Be embedded into the 2nd cam 15 in the driving shaft 11 and the 1st cam 14 and make in conjunction with protuberance 15d and be embedded into, and make both sides' cam engagement surface 15c contact and engage with 14c in conjunction with in the recess 14d, both relative rotations have been done carry out under the state that limits integrated.Under this engagement state, form 1 in conjunction with the view finder cam with relative cam surface 14b and cam surface 15b.
At the front side of above-mentioned the 1st cam 14, be inserted with the D word shape section shaft end 11a of driving shaft 11 chimericly, and restriction and fixing drive plate 13 have been made with E type back-up ring in the end.Cam force application spring 17 is compressed and has paid spring force and reversed and paying under the state of spring force around driving shaft 11 at direction of principal axis, is set between this drive plate 13 and the 1st cam 14.
Under the state that above-mentioned cam force application spring 17 has been installed, the hook portion 17b of cam force application spring 17 contacts with the projection 14e of the 1st cam 14, and the hook portion 17a of cam force application spring 17 contacts with the driving projection 13b of drive plate 13.For cam force application spring 17, owing to paid torsional torque power, thereby, drive projection 13b and projection 14e in zoom drive, the state that under the effect of above-mentioned torsional torque power (torsional moment m0) of being paid, remains in contact with one another by in the zoom drive of the 1st, the 2nd cam.Because above-mentioned torsionspring moment m0 is set to when zoom drive, bigger than the 1st, the 2nd cam 14,15 by the load torque that cam surface 14b, 15b accept, thereby driving projection 13b can not separate with projection 14e.Therefore, in zoom drive, can not produce the phase deviation of turned position of turned position and the 1st, the 2nd cam 14,15 of drive plate 13, always can carry out the zoom of the view finder corresponding with the zoom of photographic lens system.But, system advances and retreat in the driving interval in fold back zone at photographic lens, because the advance and retreat to the 1st, the 2nd zoom lens frames 18,19 limit, thereby it is as described below, only drive plate 13 rotates, and the distortion that twists of above-mentioned cam force application spring 17, thereby the 1st, the 2nd cam 14,15 is remained on the above-mentioned stop position (wide-angle position) that has been limited to rotate.
In addition, load (rotation) moment of torsion that above-mentioned the 1st, the 2nd cam 14,15 is accepted by cam surface 14b, 15b is the moment of torsion by the load of cam lever 18c, the 19c acceptance of the 1st, the 2nd zoom lens frames 18,19, this load comprises: the load that is caused by the inclination of cam surface 14b, 15b, the load that causes by the spring force of following lens force application spring 21, load that causes by the sliding resistance of the 1st, the 2nd zoom lens frames 18,19 etc.
And, to the 1st cam 14 in the 2nd cam 15 sides all the time by the compression spring power f0 application of force of cam force application spring 17, the 2nd cam 15 limits its rearward moving by the end difference 11e of driving shaft 11, thereby the 1st cam 14 and the 2nd cam 15 are maintained at direction of principal axis and sense of rotation and do not have the state that becomes flexible.
The compression spring power f0 of above-mentioned cam force application spring 17, promptly, to the strength of pushing of cam bonding position, be configured to than cam lever 18c, 19c by making following the 1st, the 2nd zoom lens frames 18,19 and cam surface 14b, 15b the dip plane contact, chimeric produces make axial power that the 1st, the 2nd cam 14,15 separates and the strength that makes the axial component sum that cam separates in the generation of cam dip plane is big by the revolving force of the 1st, the 2nd cam 14,15.Therefore, when driving when advancing and retreat by 14,15 pairs the 1st, the 2nd zoom lens frames 18,19 of the 1st, the 2nd cam, can not form the bonding part that makes between the 1st, the 2nd cam 14,15 from state.
On the other hand, above-mentioned finder optical system portion 6 has: leading axle 20, and it is fixedly supported on the view finder main body 2 along the Z ' axle parallel with optical axis Of; The 1st zoom lens frames 18 and the 2nd zoom lens frames 19, it can be supported on the leading axle 20 with advancing and retreat; And lens force application spring 21, it makes the zoom lens application of force.
Above-mentioned the 1st zoom lens frames 18 has: as the shaft sleeve part 18f of fitting portion; Axis hole 18a, it is arranged on this shaft sleeve part 18f, is the embedded hole that is used for embedding sliding freely leading axle 20; Carbine hangs jut 18d, and it is outstanding to foreign side at above-mentioned shaft sleeve part 18f right-hand end; The 18b of zoom lens portion, it is configured to be partial to the below of axis hole 18a; Projection 18e, its oblique right lower quadrant to the 18b of zoom lens portion is outstanding; And cam lever 18c, it is configured to the left of axis hole 18a outstanding.Above-mentioned cam lever 18c contacts with the cam surface 14b of the 1st cam 14 under the installment state of view finder usually, slidably, and drives in Z ' direction by cam surface 14b.
Above-mentioned the 2nd zoom lens frames 19 has: as the shaft sleeve part 19f of fitting portion; Axis hole 19a, it is arranged on this shaft sleeve part 19f, is the embedded hole that is used for being embedded into sliding freely in the leading axle 20; Carbine hangs jut 19d, and it is outstanding to foreign side at above-mentioned shaft sleeve part 19f right-hand end; The 19b of zoom lens portion, it is configured to be partial to the below of axis hole 19a; Projection 19e, its oblique right lower quadrant to the 19b of zoom lens portion is outstanding; And cam lever 19c, it is configured to the left of axis hole 19a outstanding.Above-mentioned cam lever 19c contacts with the cam surface 15b of the 2nd cam 15 under the installment state of view finder usually, slidably, and drives in Z ' direction by cam surface 15b.
Said lens force application spring 21 is the coilable compression helical springs shown in the spring free state figure of Figure 11, and the hook portion 21a at two ends, 21b are at two outsides and the predetermined angular θ that only tilts with the spiral end face of the spiral shell heart (axle center) quadrature.This lens force application spring is inserted between shaft sleeve part 18f, the 19f of the 1st, the 2nd zoom lens frames 18,19, and hook portion 21a, 21b install and become to be suspended on carbine suspension jut 18d, the 19d.Under this installing state, for lens force application spring 21, paid the torsionspring moment of torsion of axial compression spring power and sense of rotation, and, also have an effect by the angular force that the distortion of the angle θ of hook portion 21a, 21b causes.
Use Figure 13 that the active state of the spring force under the installing state of said lens force application spring 21 is described, at first, the compression spring power F1 of the Z ' direction of lens force application spring 21 acts between shaft sleeve part 18f, the 19f of the 1st, the 2nd zoom lens frames 18,19.1st, the direction that is separated from each other at direction of principal axis of the 2nd zoom lens frames 18,19 is by this spring force F1 application of force, and cam lever 18c, 19c are in all the time and above-mentioned cam surface 14b, 15b state of contact.Therefore, the 1st, the 2nd zoom lens frames 18,19 does not have under the loosening state in Z ' direction, with above-mentioned cam surface 14b, 15b is driven and move in Z ' direction advance and retreat.
And, Z ' torsionspring moment of torsion (torsionspring moment M1) around lens force application spring 21 passes through hook portion 21a, 21b, as shown in figure 13, act between the 1st, the 2nd zoom lens frames 18,19, and relative the 2nd zoom lens frames 19, to the 1st zoom lens frames 18 respectively to C1, the C2 direction rotation urging of Fig. 4.Therefore, 1st, projection 18e, the 19e of the 2nd zoom lens frames 18,19 usually according to the rules contact force contact with stop component 2b, the 2c of view finder main body side respectively, obtaining not have to rotate a state that becomes flexible around axis hole 18a, the 19a of the 1st, the 2nd zoom lens frames 18,19.In addition, suppose that the power that hangs the Y ' direction of jut 18d, 19d to carbine that is produced by the spring force of above-mentioned torsional direction is F2, the distance that hangs the X ' direction of jut 18d, 19d from the spiral shell heart to carbine is L1, and then the value of above-mentioned moment M1 is F2 * L1.
And, the hook portion 21a of lens force application spring 21,21b are as shown in figure 11, when non-installation, predetermined angular θ only tilts in the outside, hang on jut 18d, the 19d by this hook portion being suspended on carbine, make hook portion 21a, 21b only by above-mentioned angle deflection, thereby it is shifted as shown in fig. 13 and hook position 21a ', the 21b ' of Z ' axle quadrature.By above-mentioned deflection, produce spring force F3 to the spring outside of Z ' direction.The distance of supposing the X ' direction from the spiral shell heart to above-mentioned hook position 21a ', 21b ' is that the distance of L1, Y ' direction is L2, then because above-mentioned spring force F3, as the X ' axle and the axial moment components of Y ' at the center of axis hole 18a, 19a by the 1st, the 2nd zoom lens frames 18,19, the moment components M3 (driftage is shaken) of the moment components M2 of F3 * L2 (pitch is shaken) and F3 * L1 has an effect.
Because the moment of above-mentioned spring force F3, as shown in figure 12, make under the state of gap portion of the only crooked a little axis hole 18a of the 1st, the 2nd zoom lens frames 18,19,19a and leading axle 20 supported.Because this a little crooked, can eliminate loosening between axis hole 18a, 19b and the leading axle 20, the 1st, the 2nd zoom lens frames 18,19 is not moved in Z ' direction loosely.
Below, the zoom action of the Zoom finder 1 of present embodiment with above-mentioned formation is described.
Suppose that the mobile of photographic lens system is to carry out according to the order of long burnt position, wide-angle position, fold back position.Now, suppose that photographic lens ties up to long burnt position, interlock therewith then, Zoom finder 1 are also corresponding with the burnt position of length of above-mentioned photographic lens system and be in view finder and grow burnt state.This view finder for long burnt state under, shown in Figure 10 (A), drive plate 13 (D1) in the direction of the clock turns to terminal location, drive projection 13b be in the projection 14e that pushes the 1st cam 14 and with view finder main body stop component 2a state of contact.Under this state, cam lever 18c, the 19c of the 1st, the 2nd zoom lens frames 18,19 contacts with the burnt correspondence position of length of cam surface 14b, the 15b of the 1st, the 2nd cam 14,15 respectively, and the 18b of zoom lens portion, 19b are in long burnt position.
Then, if driven wheel 12 by with the linked gear group of photographic lens system to the wide-angle position rotating drive, and drive plate 13 is by (D2) rotation counterclockwise, also unitary rotation of the 1st, the 2nd cam 14,15 then, the 1st, the 2nd zoom lens frames 18,19 moves to wide-angle position separately along cam surface 14b, 15b.Zoom drive zone in this long Jiao, wide-angle slewing area, between Figure 10 (A) to (B), because the torsionspring moment m0 of cam force application spring 17 can not make above-mentioned projection 14e separate with driving projection 13b, can not produce the phase deviation of drive plate 13 and the 1st, the 2nd cam 14,15.
When photographic lens is tied to when reaching wide-angle position, the 1st, the 2nd zoom lens frames 18,19 also arrives wide-angle position simultaneously, and shown in Figure 10 (B), the projection 14e of the 1st cam 14 contacts with view finder main body stop component 2a.Afterwards, if photographic lens system moves to the fold back position, then projection 14e still contacts with view finder main body stop component 2a, promptly, 1st, the 2nd cam 14,15 still stops at the wide-angle correspondence position, the spring torque of drive plate 13 opposing cam force application springs 17 is further by the terminal rotating drive of counter clockwise direction (D2) to the fold back correspondence position.That is, under the original state of the 1st cam 14 halted states, cam force application spring 17 distortion that twists, thus allow that drive plate 13 rotating drive are to the fold back correspondence position.The state of the terminal of drive plate 13 arrival fold back correspondence positions is shown in Figure 10 (C).
When drive plate 13 with above-mentioned opposite, from above-mentioned fold back correspondence position rotating drive to the wide-angle correspondence position and and then during to long burnt correspondence position, carry out the action opposite with above-mentioned action.Promptly, if photographic lens system moves to photographic wide-angle position from the fold back position, then move interlock with this, drive plate 13 is (anti-D2) turned position from the position rotating drive of Figure 10 (C) to Figure 10 (B) in the direction of the clock, drives projection 13b and contacts with the projection 14e of the 1st cam 14.During to this contact, the 1st, the 2nd cam 14,15 stops at the wide-angle correspondence position.And, when photographic lens system when move long burnt position, drive plate 13 is (D1) rotating drive in the direction of the clock, projection 14e pushes to equidirectional by driving projection 13b, afterwards, (D1) rotating drive together in the direction of the clock.Therefore, the 1st, the 2nd cam 14,15 rotates to long burnt correspondence position from the wide-angle correspondence position, and the 1st, the 2nd zoom lens frames 18,19 moves to long burnt position from wide-angle position.Then, drive plate the 13, the 1st cam 14 turns to the turned position shown in Figure 10 (A).
To the view finder zoom drive between long burnt, the wide-angle between Figure 10 (B), because the effect of the compression spring power f0 of cam force application spring 17, the junction surface of the 1st, the 2nd cam 14,15 can not separated at above-mentioned Figure 10 (A).And, because the torsionspring moment M1 and the compression spring power F1 of lens force application spring 21 act between the 1st, the 2nd zoom lens frames 18,19, thereby can eliminate the 1st, the 2nd zoom lens frames 18,19 in the above-mentioned zoom drive relative to rotating of view finder main body 2 loosening (loosening corresponding) with the off-centre of zoom lens, the while can prevent that the cam lever of the 1st, the 2nd zoom lens frames 18,19 from separating with cam surface 14b, 15b.And, because hook portion 21a, the 21b of the inclination of lens force application spring 21 are suspended on the carbine of the 1st, the 2nd zoom lens frames 18,19 and hang on jut 18d, the 19d, thereby loosening (loosening corresponding with shaking of zoom lens) that also can eliminate axis hole 18a, 19a and the leading axle 20 of the 1st, the 2nd zoom lens frames 18,19.Therefore, be difficult to produce with above-mentioned zoom drive in the deviation and the off-centre of each zoom position of optical axis Of direction of the 1st, the 2nd zoom lens frames 18,19, can carry out high-precision zoom drive.
As mentioned above, Zoom finder 1 according to present embodiment, during the fold back action that above-mentioned photographic lens is, because the 1st, the 2nd cam 14,15, its rotation is limited by view finder main body stop component 2a, and drive plate 13 is rotated, thereby, on cam surface 14b, the 15b of the 1st, the 2nd cam 14,15, no longer need to be equivalent to the useless angle of rotation that becomes of this confined angle of rotation part, can enlarge the effective cam surface part that makes the cam lever advance and retreat thus, can reduce the cam draft angle, and it is easy that the moulding of this cam surface also becomes.Simultaneously, there is no need to set the parting line of mould, improved the driving precision of cam at this cam surface.
And, by under the state that torsionspring moment and compression spring power are provided, between the 1st zoom lens frames 18,19, insert the lens force application spring 21 be wound on the leading axle 20, can prevent with the leading axle 20 between the 1st zoom lens frames 18,19 to be the generation of the separating of cam lever 18c, 19c and cam surface 14b, 15b (becoming flexible) etc. of rotating deviation (loosening corresponding), the 1st zoom lens frames 18,19 at center with the off-centre of zoom lens.
And, tilt laterally by hook portion 21a, the 21b that makes said lens force application spring 21, the carbine of the 1st zoom lens frames 18,19 that is hung with this hook portion is hung jut 18d, 19d to be pushed to foreign side respectively, the axis hole of the 1st zoom lens frames 18,19 according to the gap slight inclination of leading axle 20, thereby can make the 1st zoom lens frames 18,19 moving sliding in state of not loosening (loosening corresponding) with shaking of zoom lens with leading axle 20.
As mentioned above,, as consider the situation that its temperature rises, then must guarantee to leave certain clearance for the gap of axis hole (fitting portion) and leading axle.And, although, be necessary further to shorten above-mentioned bearing from the viewpoint of miniaturization, yet the result who does like this is, because the gap of above-mentioned axis hole (fitting portion) and leading axle increases the shaking quantity of the 18b of zoom lens portion, 19b, the image that view finder takes place rocks.But, as mentioned above, by the hook portion 21a that utilizes lens force application spring 21, the spring force of 21b, block the gap between above-mentioned axis hole (fitting portion) and the leading axle, thereby the image that view finder can not take place rocks, but high precision is carried out the advance and retreat of the 1st zoom lens frames 18,19 and moved.And, as mentioned above, have the multiple functions such as the application of force of eliminating loosening and cam lever by making the lens force application spring, there is no need additional other force application springs, thereby the Zoom finder of the few Miniaturizable of component parts number of packages can be provided.
Below, use Figure 14, Figure 15 that the variation of the lens force application spring 21 of the zoom lens 1 that are applied to above-mentioned embodiment is described.
Figure 14 is the figure of free state of the lens force application spring of the above-mentioned variation of expression, and Figure 15 is the figure that expression is installed in the lens force application spring of above-mentioned variation the state between the zoom lens frames.
As shown in figure 14, the lens force application spring 31 of this variation is a compression helical spring, the hook portion 31a at two ends, 31b with rightabout two inboards of Figure 11 with respect to the predetermined angular θ that only tilts of the spiral end face with the spiral shell heart (axle center) quadrature.This lens force application spring 31 and said lens force application spring 21 are inserted between shaft sleeve part 18f, the 19f of the 1st, the 2nd zoom lens frames 18,19 equally, and hook portion 31a, 31b are installed to become to be suspended on carbine suspension jut 18d, the 19d.Under this installing state, for lens force application spring 31, also paid the torsionspring moment of torsion of axial compression spring power and sense of rotation, and be in the state that angular force that the distortion by hook portion 31a, 31b causes is also had an effect.
Because the axial compression spring power of said lens force application spring 31, same with the situation of lens force application spring 21, the 1st, the 2nd zoom lens frames 18,19 Z ' direction do not have loosening state down with above-mentioned cam surface 14b, 15b is driven and mobile in Z ' direction advance and retreat.And, because the torsionspring moment of torsion of sense of rotation, same with the situation of lens force application spring 21,1st, projection 18e, the 19e contact force according to the rules of the 2nd zoom lens frames 18,19 contacts all the time with stop component 2b, the 2c of view finder main body side respectively, and axis hole 18a, the 19a that obtains the 1st, the 2nd zoom lens frames 18,19 do not have to rotate the state of loosening (loosening corresponding with the off-centre of zoom lens) on every side.
And the hook portion 31a of lens force application spring 31, the 31b predetermined angular θ that only tilts to the inside as shown in figure 14 hangs on jut 18d, the 19d by this hook portion being suspended on carbine, makes hook portion 31a, 31b only according to above-mentioned angle deflection.Because above-mentioned deflection produces the spring force F3 ' to the spring inboard of Z ' direction.Because the moment of above-mentioned spring force F3, as shown in figure 15, the 1st, the 2nd zoom lens frames 18,19 is only supported under the crooked to the inside state of above-mentioned hook portion according to the gap of axis hole 18a, 19a and leading axle 20.Because should be crooked, under the state that becoming flexible between axis hole 18a, 19a and leading axle 20 (becoming flexible corresponding with shaking of zoom lens) is eliminated, the 1st, the 2nd zoom lens frames 18,19 moves.
According to the Zoom finder of the lens force application spring 31 that adopts this variation, can obtain the effect same with the Zoom finder 1 of an above-mentioned embodiment.
In addition, full angle of rotation as the 1st, the 2nd cam 14,15 of the cam part of the Zoom finder 1 of above-mentioned embodiment, although cam has approximate 360 ° angle, yet when being necessary to make this full angle of rotation more than or equal to 360 °, by being provided with between the projection 14e and view finder main body stop component 2a of the 1st cam 14, can becoming the counterrotating rotor plate parts of predetermined angular, can make above-mentioned full angle of rotation more than or equal to 360 ° with projection 14e.
And, although above-mentioned embodiment has been done expression to the example that is applied to Zoom finder, yet be not limited thereto, also can be applied to zoom formula photographic lens optical devices to same formation.
As mentioned above, according to the utility model, owing to only use volute spring, just can prevent the off-centre of zoom lens and shake loosening generation, thereby there is no need to append the parts of the special purpose spring of eliminating loosening usefulness etc., still keep miniaturization with regard to observing stable image, thereby the Varifocus optical apparatus of the few Miniaturizable of a kind of necessary configuration space can be provided.
Claims (1)
1. Varifocus optical apparatus is characterized in that having:
1 set vari-focus lens is used for moving assigned position by cam part at optical axis direction;
Leading axle is used to support above-mentioned zoom lens and moves freely at optical axis direction;
Fitting portion, it is arranged on above-mentioned 1 set vari-focus lens, has the embedded hole that makes above-mentioned leading axle chimeric; And
Volute spring, it is arranged to be clipped between the above-mentioned embedded hole and is wound on the above-mentioned leading axle, and to the above-mentioned 1 set vari-focus lens application of force, make its optical axis direction mutually near or away from,
Be formed with button respectively at above-mentioned helical spring two ends and be stuck in button card division on the above-mentioned fitting portion, above-mentioned button card division is formed under the spring free state from the position of volute spring end face to the displacement of spiral axis direction, so that apply separately reciprocal each other moment with the axle system of optical axis direction quadrature to above-mentioned fitting portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP056285/2003 | 2003-03-03 | ||
| JP2003056285A JP2004264699A (en) | 2003-03-03 | 2003-03-03 | Zoom optical apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2802532Y true CN2802532Y (en) | 2006-08-02 |
Family
ID=33120043
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410006150 Expired - Fee Related CN1288470C (en) | 2003-03-03 | 2004-03-02 | Varifocus optical apparatus |
| CN 200420005827 Expired - Fee Related CN2802532Y (en) | 2003-03-03 | 2004-03-02 | Variable-focus optical device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410006150 Expired - Fee Related CN1288470C (en) | 2003-03-03 | 2004-03-02 | Varifocus optical apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2004264699A (en) |
| CN (2) | CN1288470C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633851A (en) * | 2017-10-06 | 2019-04-16 | 佳能株式会社 | Picture pick-up device |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006091408A (en) * | 2004-09-24 | 2006-04-06 | Fuji Photo Film Co Ltd | Lens moving device, imaging apparatus and optical device |
| JP2006098652A (en) * | 2004-09-29 | 2006-04-13 | Kyocera Corp | Optical device and camera module |
| JP2006178269A (en) * | 2004-12-24 | 2006-07-06 | Fujinon Corp | Lens-moving device, imaging apparatus, and optical apparatus |
| JP4045290B2 (en) * | 2006-05-19 | 2008-02-13 | シャープ株式会社 | Imaging device |
| KR101255208B1 (en) * | 2006-06-22 | 2013-04-23 | 삼성전자주식회사 | Zoom lens barrel assembly |
| WO2010016497A1 (en) | 2008-08-05 | 2010-02-11 | シャープ株式会社 | Surface light source device |
| US8054404B2 (en) | 2008-08-05 | 2011-11-08 | Sharp Kabushiki Kaisha | Surface light source device |
| JP2010039404A (en) * | 2008-08-08 | 2010-02-18 | Nikon Corp | Lens barrel and imaging apparatus |
| JP5633288B2 (en) * | 2010-10-01 | 2014-12-03 | 株式会社リコー | Lens barrel and imaging device |
| CN103091812A (en) * | 2011-11-04 | 2013-05-08 | 华晶科技股份有限公司 | Lens of improving focusing accuracy rates and photographic device thereof |
| JP5970344B2 (en) * | 2012-11-09 | 2016-08-17 | Hoya株式会社 | Optical element position control mechanism |
| JP6827769B2 (en) * | 2016-10-26 | 2021-02-10 | キヤノン株式会社 | Lens barrel and imaging device |
-
2003
- 2003-03-03 JP JP2003056285A patent/JP2004264699A/en not_active Withdrawn
-
2004
- 2004-03-02 CN CN 200410006150 patent/CN1288470C/en not_active Expired - Fee Related
- 2004-03-02 CN CN 200420005827 patent/CN2802532Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633851A (en) * | 2017-10-06 | 2019-04-16 | 佳能株式会社 | Picture pick-up device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004264699A (en) | 2004-09-24 |
| CN1527085A (en) | 2004-09-08 |
| CN1288470C (en) | 2006-12-06 |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060802 Termination date: 20130302 |