CN1307453C - Varifocal mirrorscope - Google Patents
Varifocal mirrorscope Download PDFInfo
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- CN1307453C CN1307453C CNB2004100061497A CN200410006149A CN1307453C CN 1307453 C CN1307453 C CN 1307453C CN B2004100061497 A CNB2004100061497 A CN B2004100061497A CN 200410006149 A CN200410006149 A CN 200410006149A CN 1307453 C CN1307453 C CN 1307453C
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Abstract
This zoom finder has a 1st cam 14 and a 2nd cam 15 as a joined cam member for driving 1st and 2nd zoom lens frames 18 and 19 to move forward and backward, and the 1st and 2nd cams are supported rotatably by a driving shaft 11 while coupled together through a coupling part. A driving plate 13 which turns associatively with zoom driving of a collapsible taking lens system is fixed to the driving shaft 11 and the driving plate 13 and 1st cam 14 are coupled to abut a projection 13b and a projection 14e through a cam energizing spring 17. The 1st and 2nd cams are driven to turn in the projection abutting state in a zoom area, but in a collapse area, the 1st and 2nd cams are stopped, the projections 14e and 13b are separated, and while the cam energizing spring is twisted to deform, only the driving plate 13 is driven to turn.
Description
Technical field
The present invention relates to the lens actuating device of a kind of camera with Zoom finder.
Background technology
In the past, in the Zoom finder of camera, as in order to make view finder move to the form of the cam member of assigned position, the form of the board-like cam that forms cam path on plate-shaped member is arranged and form the form of the drum type brake cam of cam path at outer peripheral face with mobile lens advance and retreat.Above-mentioned drum type brake cam is compared with tabular cam, lays particular emphasis on the cam member miniaturization on every side of view finder, but exist following problem on making.That is, on the parts manufacturing cost, any cam of drum type brake cam and board-like cam all is fabricated to prerequisite with injection mo(u)lding, yet under the situation of above-mentioned drum type brake cam, the mold structure, molding complexity has problems in Mold Making.That is,, need dwindle the cam diameter, for this reason, must make the drum type brake cam can be with many rotation amounts in order to make the view finder miniaturization, that is, near or be rotated greater than 360 ° the anglec of rotation.Relying on the mould of simple front and back withdrawing pattern is moulding to form such drum type brake cam.
For example, patent documentation 1 has proposed the manufacture method of the anglec of rotation greater than 360 ° drum type brake cam.In this manufacture method, adopt axially before and after withdrawing pattern mould with the sliding mould of axially vertical direction, above-mentioned drum type brake cam member is shaped to parts.
On the other hand, as not using above-mentioned sliding mould, make the anglec of rotation near or greater than the method for 360 ° drum type brake cam, the method that has the one side used to make the rotation withdrawing pattern pattern tool of a withdrawing pattern of mould rotation carry out moulding.But in rotation withdrawing pattern mode, the cam curve that can realize is restricted, and the situation that can not adopt rotation withdrawing pattern mode because of cam curve is also arranged, and therefore, the scope of application is narrow.
In addition, as the motion of drum type brake cam face, for example, be not limited to integrally formed drum type brake cam, cut apart shaping, the parts that will cut apart moulding make up and make a cam member.For example, in the adjusting mechanism of the zoom lens that patent documentation 2 proposes, the cam canister that drives a plurality of mobile lens is cut apart making by each lens being used for advancing and retreat respectively, carry out the position adjustment that this cuts apart cam canister with screw etc., form incorporate cam canister, use this one cam canister, advance and retreat drive a plurality of mobile lens.
The product that the drum type brake cam manufacture method that proposes according to above-mentioned patent documentation 1 obtains is because use sliding mould and front and back withdrawing pattern mould, so in the junction of sliding mould and front and back withdrawing pattern mould, to be that so-called matched moulds position produces ladder poor.Therefore, generation must make the matched moulds position not enter restriction in the design such as cam part.
In addition, use under the situation of cutting apart cam canister as the zoom lens adjusting mechanism that above-mentioned patent documentation 2 proposes, need carry out the position adjustment that this cuts apart cam, assembling needs man-hour, and may form maximization.Though can carry out the fixing of above-mentioned position adjustment by bonding joint, can the material production of cam member be limited, and can cause because of the bonding precise decreasing that utilization caused.In addition, though also can under the effect of pressure, may produce the decline of cam curve precision by pressure in conjunction with being pressed into one cutting apart cam.
Summary of the invention
In view of the above problems, the objective of the invention is, provide a kind of cam member easy to manufacture, lens advance and retreat positional precision height and can realize the Zoom finder of miniaturization.
The present invention's 1 Zoom finder, have the zoom lens that move at optical axis direction, with cylindric cam member in the cam part that forms the position of the above-mentioned zoom lens of decision on optical axis direction on the outer peripheral face, rotation by above-mentioned cam member moves on the position of decision above-mentioned zoom lens, it is characterized in that, above-mentioned cam member is by cylindraceously axially being divided into a plurality of cam parts and combining above-mentioned, above-mentioned cam part is made by moulding, and it is being in contact with one another and is making up on the face of the equidirectional inclination of vergence direction of the cam surface of above-mentioned cam part, and above-mentioned cam member has for cam part after the combinations thereof is not separated and to the force application spring of the direction application of force that cam part is mutually combined.
The present invention's 2 Zoom finder, in the present invention's 1 Zoom finder, constitute, by being entrenched in zoom lens on the above-mentioned cam part to the acting force of above-mentioned cam part and the power that produces by the revolving force that applies to above-mentioned cam part to the face of above-mentioned inclination, be used for cam part after the combinations thereof as the masterpiece that this cam part is separated respectively, set above-mentioned force application spring to make cam part mutually combine the application of force of direction greater than above-mentioned zoom lens to the acting force of above-mentioned cam part and the above-mentioned power sum that produces by the revolving force that applies to above-mentioned cam part to the face of above-mentioned inclination.
The present invention's 3 Zoom finder, in the present invention's 1～2 Zoom finder, has turning axle, this turning axle constitutes the rotation from drive source is delivered to above-mentioned cam member, support the rotation of above-mentioned cam part simultaneously, the one end is outstanding from the end face of above-mentioned cam part, above-mentioned force application spring is installed in the volute spring on the outshot of above-mentioned turning axle by reeling, lean direction by the cam part of this helical spring axial force after to combination combinations thereof, make above-mentioned turning axle and above-mentioned cam member interlock by above-mentioned force application spring in the power of torsional direction simultaneously, the rotation of above-mentioned turning axle is delivered to cam member, and in the rotating range of the above-mentioned turning axle under the confined state of side rotation of above-mentioned cam member, torsion angle displacement by above-mentioned force application spring absorbs the transmission of the rotation of above-mentioned turning axle.
Description of drawings
Fig. 1 is the figure of summary configuration of the Zoom finder of expression an embodiment of the present invention, is the pattern stereographic map when bottom surface side is watched Zoom finder.
Fig. 2 is the exploded perspective view during from the major part of Zoom finder that the camera bottom surface side is watched above-mentioned Fig. 1.
Fig. 3 is the upward view when the camera bottom surface side is watched the view finder driving mechanism portion of the Zoom finder that constitutes above-mentioned Fig. 2 and finder optical system portion.
Fig. 4 is the stereographic map during from the finder optical system portion that the camera bottom surface side is watched above-mentioned Fig. 3.
Fig. 5 is the local stretch-out view of the 1st cam of the view finder driving mechanism portion of above-mentioned Fig. 3.
Fig. 6 is the sectional view along the B-B line of above-mentioned Fig. 5.
Fig. 7 is the local stretch-out view of the 2nd cam of the view finder driving mechanism portion of above-mentioned Fig. 3.
Fig. 8 is the sectional view along the C-C line of above-mentioned Fig. 7.
Fig. 9 is the sectional view of cam engagement portion of the 1st, 2 cams of the view finder driving mechanism portion of above-mentioned Fig. 3.
Figure 10 is the A-A line sectional view of Fig. 3, represent the 1st cam of above-mentioned finder optical system portion and the rotation status separately of drive plate, state when Figure 10 (A) expression is positioned at long burnt turned position, state when Figure 10 (B) expression is positioned at 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 corresponding fold back point 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 state that the lens force application spring of above-mentioned Figure 11 has been installed in expression.
Figure 13 is the figure that is illustrated in the active state of the power in the lens force application spring of above-mentioned Figure 11.
Among the figure: 14-the 1st cam (cam member, cam part); 14b, 15b-cam surface (cam part); 15-the 2nd cam (cam member, cam part); 14d, 15d-are in conjunction with protuberance (restriction face); 17-cam force application spring (force application spring); 18b-zoom lens portion (zoom lens).
Embodiment
Below, embodiments of the present invention are described with reference to the accompanying drawings.
Fig. 1 is the figure of summary configuration of the Zoom finder of expression one embodiment of the present invention, is the pattern stereographic map when bottom surface side is watched Zoom finder.
The Zoom finder 1 of present embodiment is incorporated in the view finder main body 2 as shown in Figure 1, has: object lens 3; By being used to adjust the 1st zoom lens frames 18 of zoom ratio and the finder optical system portion 6 that the 2nd zoom lens frames 19 constitutes; The object light of injecting by object lens 3 is reflexed to the prism 4 of view finder lens section side and ejaculation; Make the view finder driving mechanism portion 5 of above-mentioned finder optical system portion 6 and Photographical lens system side interlock advance and retreat; The above-mentioned finder optical system portion 6 that can advance and retreat; With eyepiece 8.
About 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, use Fig. 2～13 to be elaborated.
Fig. 2 is the exploded perspective view during from the major part that the camera bottom surface side PB direction of Fig. 1 is watched above-mentioned Zoom finder.Fig. 3 is the upward view when the camera bottom surface side PA direction of Fig. 1 is watched the view finder driving mechanism portion that constitutes above-mentioned Zoom finder and finder optical system portion.Fig. 4 is the stereographic map when the camera bottom surface side PA direction of Fig. 1 is watched above-mentioned finder optical system portion.Fig. 5 is the local stretch-out view of the 1st cam of view finder driving mechanism portion.Fig. 6 is the sectional view of the B-B line of the Fig. 5 around the expression cam engagement portion.Fig. 7 is the local stretch-out view of the 2nd cam of view finder driving mechanism portion.Fig. 8 is the sectional view of the C-C line of the Fig. 7 around the expression cam engagement portion.Fig. 9 is the sectional view of above-mentioned cam engagement portion.Figure 10 is the A-A line sectional view of Fig. 3, the rotation status separately of representing above-mentioned the 1st cam and drive plate, when Figure 10 (A) expression is positioned at long burnt position, when Figure 10 (B) expression is positioned at wide-angle position, when Figure 10 (C) expression the 1st cam stops at wide-angle position, drive plate turns to the state of corresponding fold back point 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 that the state of said lens force application spring has been installed in expression.Figure 13 is the figure that is illustrated in the active state of the power in the said lens force application spring.
In addition, in the following description, the optical axis of Zoom finder optical system is made as Of, the axle center of the aftermentioned driving shaft 11 parallel with optical axis Of is made as the Z axle, its direction is made as the Z direction, and the axle center of leading axle 20 described later is made as Z ' axle, its direction is made as Z ' direction.Being made as Y or Y ' direction, being made as X or X ' direction with Z axle, a Z ' vertical left and right directions with Z axle, a Z ' vertical above-below direction.Wherein, up and down or about be with the represented direction of the direction on Fig. 2.And, the object lens side of optical axis Of is made as the place ahead, the eyepiece side is made as the rear, sense of rotation uses the sense of rotation when the place ahead is watched to represent.
The view finder driving mechanism portion 5 of the Zoom finder 1 of formation present embodiment and the zoom drive interlock of photograph pusher side Photographical lens system, driving finder optical system portion 6 advance and retreat, is to keep the view finder driving mechanism portion that the advance and retreat that make finder optical system portion 6 drive the state that stops in the drive area of turning back of above-mentioned Photographical lens system.And, be applicable to the cam part of view finder driving mechanism portion 5, in order to set the cam pressure angle forr a short time, employing can with the anglec of rotation of wide scope rotate in conjunction with cam structure.
Above-mentioned view finder driving mechanism portion 5 has: by the driving shaft 11 as turning axle of view finder main body 2 pivotal support as Fig. 2, shown in Figure 3; By the driven wheel 12 of the two ends fixed support of above-mentioned driving shaft 11 and drive plate 13; Cam force application spring 17; Be embedded into and be supported on the driving shaft 11, and the 1st cam 14 and the 2nd cam 15 of cam part that can rotate relative to this, the cylindric cam member of conduct formation.
Above-mentioned driving shaft 11 has: be shaft end 11a, 11b and E type draw-in groove 11c, 11d and the end difference 11e of D word shape at the both ends upper section, be supported in the view finder main body 2 with the state along the Z axle parallel with optical axis Of with being rotated freely.
Above-mentioned driven wheel 12 has the D word shape axis hole 12a that can be fitted to driving shaft 11 front ends, and by not shown gear set, the zoom drive interlock of turning back and driving with comprising Photographical lens system is driven in rotation.
Above-mentioned drive plate 13 has the driving projection 13b that is projected into D word shape axis hole 13a and the 1st cam 14 sides.
Above-mentioned cam force application spring 17 is spiral fashion torque springs that two ends have hook portion 17a, 17b, also can be compressed in the axial direction.
Above-mentioned the 1st cam 14 is members that the injection mo(u)lding by resin etc. forms, and has: the axis hole 14a that embeds driving shaft 11 and rotate freely; Become that to have relatively with axis hole 14a be the cam surface 14b of drum type brake cam surface of dip plane of the optical axis in axle center; The cam engagement surface 14c on the composition surface of formation and the 2nd cam 15; Become with the 2nd cam 15 engaging portion, be formed for limiting with the counterrotating restriction face of the 2nd cam 15 combine recess 14d; Protrude in drive plate 13 sides, can contact with the driving projection 13b of drive plate 13 and separate, and can contact the projection 14e of view finder main body side block 2a.
The expansion shape of above-mentioned the 1st cam 14 when moulding the 1st cam 14, carries out withdrawing pattern along the derivation direction S of cam surface 14b as shown in Figure 5.Therefore, Yi Bian above-mentioned in conjunction with the having at least of recess 14d along the dip plane of above-mentioned derivation direction S, can carry out above-mentioned withdrawing pattern.In addition, above-mentioned cam surface 14b is the cam surface of the 18c of the cam follower portion sliding contact of aftermentioned the 1st view finder lens frame 18, the parting line when not having moulding on this cam surface.
Above-mentioned the 2nd cam 15 is members that the injection mo(u)lding by resin etc. forms, and has: the axis hole 15a that embeds driving shaft 11 and rotate freely; Become that to have relatively with axis hole 15a be the cam surface 15b of drum type brake cam surface of dip plane of the optical axis in axle center; Form cam engagement surface 15c with the composition surface that engages of the 1st cam 14; Cheng Yudi 1 cam 14 engaging portion, be formed for limiting with the counterrotating restriction face of the 1st cam 14 combine protuberance 15d.
Fig. 6 represents the cross sectional shape in conjunction with recess 14d of above-mentioned the 1st cam 14, and Fig. 8 represents the cross sectional shape in conjunction with protuberance 15d of above-mentioned the 2nd cam 15.Above-mentioned in conjunction with recess 14d with above-mentioned combine shown in the sectional view that protuberance 15d presses Fig. 9 chimeric and engage.
The expansion shape of above-mentioned the 2nd cam 15 when moulding the 2nd cam 15, carries out withdrawing pattern along the derivation direction S of cam surface 15b as shown in Figure 7.Therefore, Yi Bian above-mentioned in conjunction with the having at least of protuberance 15d along the dip plane of above-mentioned derivation direction S, can carry out above-mentioned withdrawing pattern.In addition, above-mentioned cam surface 15b is the cam surface of the 19c of the cam follower portion sliding contact of aftermentioned the 2nd view finder lens frame 19, 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 embeds and is rotated freely pivotal support on the shaft end 11b in the D of the rearward end of the driving shaft on the view finder main body 2 11 word shape cross section, with the fixing state anchor portion of E type snap ring.The 2nd cam 15 that contacts with end difference 11e embeds its front side with rotating freely, and embeds the 1st cam 14 in its place ahead with rotating freely.Embed the 2nd cam 15 and the 1st cam 14 of driving shaft 11, make in conjunction with protuberance 15d to be fitted to, and both sides' cam engagement surface 15c is contacted with 14c, form one with the counterrotating state that limits both in conjunction with recess 14d.Formation has the joint view finder cam of cam surface 14b relative under this engagement state and cam surface 15b.
Shaft end 11a in the D word shape cross section of the chimeric driving shaft 11 of the front side of above-mentioned the 1st cam 14 with E type snap ring confinement end, inserts the drive plate 13 that is fixed.Spring 17 by having been paid spring force to axial compression, and is installed between this drive plate 13 and the 1st cam 14 by reversing to get involved under the state of having been paid spring force around driving shaft 11.
Under the installment state of above-mentioned cam force application spring 17, the hook portion 17b of cam force application spring 17 contacts the projection 14e of the 1st cam 14, the driving projection 13b of the hook portion 17a contact drive plate 13 of cam force application spring 17.Because cam force application spring 17 has been paid torsional moment, so in the zoom drive of being undertaken, drive projection 13b and projection 14e and in zoom drive, be retained the state that is in contact with one another with above-mentioned torsional moment of being paid (torsional moment m0) by the 1st, 2 cams.Because the above-mentioned torsional moment m0 that is paid is set greater than the load moment of the 1st, 2 cams 14,15 by cam surface 14b, 15b acceptance when zoom drive, can not separate with projection 14e so drive projection 13b.Therefore, in zoom drive, can not produce the phase deviation of turned position of turned position and the 1st, 2 cams 14,15 of drive plate 13, can carry out the zoom of the view finder corresponding all the time with the zoom of Photographical lens system.But, in the turn back driving interval in zone of Photographical lens system advance and retreat, in order to limit the advance and retreat of the 1st, 2 zoom lens frames 18,19, described by the back, by drive plate 13 is rotated, make the distortion that twists of above-mentioned cam force application spring 17, make the 1st, 2 cams 14,15 be maintained at the stop position (wide-angle position) that has been limited above-mentioned rotation.
In addition, load (rotation) moment that above-mentioned the 1st, 2 cams 14,15 are accepted by cam surface 14b, 15b, be the moment that load that the 18c of cam follower portion, 19c by the 1st, 2 zoom lens frames 18,19 described later accept forms, this load is the load that forms of the inclination because of cam surface 14b, 15b and the load that forms because of the spring force of lens force application spring 21 described later and the sums such as load that form because of the sliding resistance of the 1st, 2 zoom lens frames 18,19.
And, compression spring power f0 by cam force application spring 17 leans the 1st cam 14 usually to the 2nd cam 15 sides, end difference 11e by driving shaft 11 has limited the rearward mobile of the 2nd cam 15, does not have loosening state so the 1st cam 14 and the 2nd cam 15 are maintained on axial and sense of rotation.
The compression spring power f0 of above-mentioned cam force application spring 17, promptly, the strength of pushing that imposes on the cam engagement direction is to produce on the 18c of cam follower portion, 19c contact by the 1st, 2 zoom lens frames 18,19 described later and the dip plane that is fitted to cam surface 14b, 15b, be set the axial component sum that cam is separated that produces in the cam dip plane greater than axial force that the 1st, 2 cams 14,15 are separated and revolving force by the 1st, 2 cams 14,15.Therefore, when driving the 1st, 2 zoom lens frames 18,19 advance and retreat by the 1st, 2 cams 14,15, the bonding part that can not produce 14,15 on the 1st, 2 cams from state.
On the other hand, above-mentioned finder optical system portion 6 has: be fixedly supported on leading axle 20 on the view finder main body 2 along the Z ' axle parallel with optical axis Of; Along leading axle 20 can advance and retreat supported the 1st zoom lens frames 18 and the 2nd zoom lens frames 19 in ground; With the lens force application spring 21 that zoom lens is applied spring force.
Above-mentioned the 1st zoom lens frames 18 has: the shaft sleeve part 18f that becomes fitting portion; Be located on this shaft sleeve part 18f, become the axis hole 18a that embeds the embedded hole of leading axle 20 with being free to slide; At above-mentioned shaft sleeve part 18f right-hand end to the outstanding 18d of spring suspension portion of foreign side; The below of bias axis hole 18a and the 18b of zoom lens portion that disposes; To the outstanding projection 18e of the oblique right lower quadrant of the 18b of zoom lens portion; The outstanding 18c of cam follower portion that is configured in the left of axis hole 18a.The above-mentioned cam follower 18c of portion can slide leaning usually under the view finder confined state on the cam surface 14b of the 1st cam 14, is driven to Z ' direction by cam surface 14b.
Above-mentioned the 2nd zoom lens frames 19 has: the shaft sleeve part 19f that becomes fitting portion; Be located on this shaft sleeve part 19f, become the axis hole 19a that embeds the embedded hole of leading axle 20 with being free to slide; At above-mentioned shaft sleeve part 19f right-hand end to the outstanding 19d of spring suspension portion of foreign side; The below of bias axis hole 19a and the 19b of zoom lens portion that disposes; To the outstanding projection 19e of the oblique right lower quadrant of the 19b of zoom lens portion; The outstanding 19c of cam follower portion that is configured in the left of axis hole 19a.The above-mentioned cam follower 19c of portion can slide leaning usually under the view finder confined state on the cam surface 15b of the 2nd cam 15, is driven to Z ' direction by cam surface 15b.
Said lens force application spring 21 is by the compression helical spring that can reverse shown in the spring free state figure of Figure 11, and the relative volute spring end face vertical with spiral shell core (axle core) of hook portion 21a, 21b that is configured to two ends is to two outside inclination predetermined angular θ.This lens force application spring is inserted between shaft sleeve part 18f, the 19f of the 1st, 2 zoom lens frames 18,19, hook portion 21a, 21b is hung be installed on the 18d of spring suspension portion, the 19d.Under this installment state, lens force application spring 21 has been paid the torsional moment of axial compression spring force and sense of rotation, and the angular force that produces because of the distortion of the angle θ of hook portion 21a, 21b also plays effect.
Use Figure 13 that the active state of the spring force under the installment 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, 2 zoom lens frames 18,19.By this spring force F1, the 1st, 2 zoom lens frames 18,19 are leaned in the direction that axially is separated from each other, and the 18c of cam follower portion, 19c are in the state that leans above-mentioned cam surface 14b, 15b usually.Therefore, the 1st, 2 zoom lens frames 18,19 move in Z ' direction advance and retreat with driven on above-mentioned cam surface 14b, 15b at the gapless state of Z ' direction.
In addition, the axial torsional moment of the Z ' of lens force application spring 21 (torsional moment M1) is by hook portion 21a, 21b, as shown in figure 13, act between the 1st, 2 zoom lens frames 18,19, the 1st zoom lens frames 18 and the 2nd zoom lens frames 19 are made C1 from its rotation to Fig. 4, the C2 direction application of force respectively.Therefore, projection 18e, the 19e of the 1st, 2 zoom lens frames 18,19 leans block 2b, the 2c of view finder main body side usually respectively with the power that leans of regulation, and the axis hole 18a, the 19a that form the 1st, 2 zoom lens frames 18,19 do not have the loosening state that rotates on every side.And the power of the Y ' direction of the 18d of spring suspension portion, the 19d that the moment because of above-mentioned torsional direction is produced is made as F2, and when the distance of the X ' direction from the spiral shell core to the 18d of spring suspension portion, 19d was made as L1, the value of above-mentioned moment M1 was F2 * L1.
In addition, the hook portion 21a of lens force application spring 21,21b are as shown in figure 11, when non-equipment state, predetermined angular θ laterally only tilts, by this hook portion being suspended on the 18d of spring suspension portion, the 19d, hook portion 21a, 21b be the above-mentioned angle of deflection only, as shown in figure 13, moves to and vertical hook position 21a ', the 21b ' of Z ' axle.By the spring force F3 of above-mentioned deflection generation towards the spring outside of Z ' direction.Be made as L2 if the distance from the dish core to the X ' direction of above-mentioned hook position 21a ', 21b ' is made as the distance of L1, Y ' direction, by above-mentioned spring force F3, as the X ' axle and the axial moment components of Y ' at the axis hole 18a that passes through the 1st, 2 zoom lens frames 18,19,19a center, the moment components M3 of the moment components M2 of F3 * L2 (pitch swing) and F3 * L1 (swing of breakking away) works.
By the moment that is produced by above-mentioned spring force F3, as shown in figure 12, the 1st, 2 zoom lens frames 18,19 are supported for the slight inclination state that is equivalent to gap portion between axis hole 18a, 19a and the leading axle 20.By the gap that this slight inclination is eliminated axis hole 18a, 19a and leading axle 20, the 1st, 2 zoom lens frames 18,19 non-loosening ground are moved in Z ' direction.
Below, the zoom action of the Zoom finder 1 of the present embodiment with said structure is described.
Photographic lens mobile is to be undertaken by long burnt position, wide-angle position, the order of turning back.Suppose Photographical lens system current be to be positioned at long burnt position, with its interlock, the Zoom finder 1 also burnt position of length of corresponding above-mentioned Photographical lens system is in the long burnt state of view finder.Under the long burnt state of this view finder, shown in Figure 10 (A), drive plate 13 clockwise (D1) rotates up to terminal location, drives the projection 14e that projection 13b pushes the 1st cam 14, is in the state of contact view finder main body block 2a.Under this state, the 18c of cam follower portion, the 19c of the 1st, 2 zoom lens frames 18,19 contacts the burnt correspondence position of length of cam surface 14b, the 15b of the 1st, 2 cams 14,15 respectively, and the 18b of zoom lens portion, 19b are in long burnt position.
Then, when by with the linked gear group of Photographical lens system, driving driven wheel 12 rotates towards wide-angle position, when drive plate 13 counterclockwise (D2) is rotated, 1st, 2 cams 14,15 also rotate together, and the 1st, 2 zoom lens frames 18,19 move to separately wide-angle position along cam surface 14b, 15b.The zoom drive zone of this long Jiao, wide-angle slewing area, in interval from Figure 10 (A) to (B), can not separate with driving projection 13b, can not produce the phase deviation of drive plate 13 and the 1st, 2 cams 14,15 owing to the torsional moment m0 that produces because of cam force application spring 17 makes above-mentioned projection 14e.
When Photographical lens system arrived wide-angle position, the 1st, 2 zoom lens frames 18,19 also arrived wide-angle position simultaneously, shown in Figure 10 (B), and the projection 14e of the 1st cam 14 contact view finder main body block 2a.Then, Photographical lens system enters the position of turning back, under the state of projection 14e contact view finder main body block 2a, promptly the 1st, 2 cams 14,15 stop under the state of wide-angle correspondence position, the spring torque of drive plate 13 resistance cam force application springs 17 is being driven counterclockwise and is rotating to the terminal of the correspondence position of turning back (D2).That is, under the state of the halted state of keeping the 1st cam 14,, allow driving drive plate 13 and turn to the correspondence position of turning back by the torsional deflection of cam force application spring 17.State when the correspondence position terminal is turned back in drive plate 13 arrival is shown in Figure 10 (C).
Drive plate 13 by with above-mentioned on the contrary from the above-mentioned correspondence position of turning back to the wide-angle correspondence position, drive under the situation of rotating to long burnt correspondence position again, carry out the action opposite with above-mentioned action.Promptly, when Photographical lens system when the position of turning back is moved to the wide-angle position that can photograph, move interlock with this, drive plate 13 is driven the turned position that turns to Figure 10 (B) by the position from Figure 10 (C) clockwise (opposite D2), drives the projection 14e that projection 13b contacts the 1st cam 14.Before when this contacts, the 1st, 2 cams 14,15 stop at the wide-angle correspondence position.And by when move long burnt position, drive plate 13 is rotated by clockwise (D1) driving, by driving projection 13b, projection 14e is pressed to equidirectional at Photographical lens system, later on by (D1) driving rotation clockwise integratedly.Therefore, the 1st, 2 cams 14,15 rotate towards long burnt correspondence position from the wide-angle correspondence position, make the 1st, 2 zoom lens frames 18,19 move to long burnt position from wide-angle position.And drive plate the 13, the 1st cam 14 turns to turned position shown in Figure 10 (A).
The view finder zoom drive from above-mentioned Figure 10 (A) to long Jiao Figure 10 (B), between wide-angle, by the compression spring power f0 that forms because of cam force application spring 17, the junction surface of the 1st, 2 cams 14,15 can not separated.And, the torsional moment M1 of lens force application spring 21 and compression spring power F1 act between the 1st, 2 zoom lens frames 18,19, so the 1st, 2 zoom lens frames 18,19 that can eliminate in the above-mentioned zoom drive process are become flexible (off-centre of corresponding zoom lens is loosening) relative to rotating of view finder main body 12, have prevented that simultaneously the cam follower of the 1st, 2 zoom lens frames 18,19 from separating from cam surface 14b, 15b.And, the hook portion 21a of the inclination of lens force application spring 21,21b are suspended on the 18d of spring suspension portion, the 19d of the 1st, 2 zoom lens frames 18,19, so can eliminate loosening (swings of corresponding zoom lens) of axis hole 18a, 19a and the leading axle 20 of the 1st, 2 zoom lens frames 18,19.So, in above-mentioned zoom drive process, be not easy to take place on optical axis Of direction and the deviation or the off-centre each zoom position of the 1st, 2 zoom lens frames 18,19, form zoom drive accurately.
In addition, in the Zoom finder 1 of present embodiment, the cam force application spring 17 that is wound on the driving shaft 11 is being inserted under the state of having paid torsional moment and compression spring power between drive plate 13 and the 1st cam 14, thereby can eliminate the gap of 14,15 on the 1st, 2 cams with an above-mentioned cam force application spring, make the phase place of drive plate 13 and the 1st cam 14 not produce deviation simultaneously.
And, the lens force application spring 21 that is wound on the leading axle 20 is being inserted under the state of having paid torsional moment and compression spring power between the 1st, 2 zoom lens frames 18,19, can prevent that leading axle 20 with 18,19 of the 1st, 2 zoom lens frames from being that the 18c of cam follower portion, the 19c of pivot offset and the 1st, 2 zoom lens frames 18,19 at center and cam surface 14b, 15b produce and separate etc.
And, tilt laterally by hook portion 21a, the 21b that makes said lens force application spring 21, the 18d of spring suspension portion, the 19d that are suspended on the 1st, 2 zoom lens frames 18,19 on this hook portion are pressed respectively to foreign side, the axis hole of the 1st, 2 zoom lens frames 18,19 is formed be equivalent to and leading axle 21 between the inclination of gap portion, can and 20 non-loosenings of leading axle slide in state movingly, the 1st, 2 zoom lens frames 18,19 are advanced and retreat accurately move.
Have by each force application spring that makes as above assembling and to eliminate loosening and provide multiple function such as spring force, can reduce the number of the force application spring that is assembled, reduce the structure member number, can accomplish the miniaturization of Zoom finder.
In addition, in the above-described embodiment, though become the 1st, 2 cams 14,15 of the cam member in the Zoom finder 1, be the total rotational angle of conduct, has cam near 360 ° of angles, but make this total rotational angle under the situation more than 360 ° at needs, can make above-mentioned total rotational angle more than 360 ° to the rotor plate parts that projection 14e can rotate predetermined angular by additional phase between the projection 14e of the 1st cam 14 and view finder main body block 2a.
The invention effect
According to above-mentioned the present invention, can provide a kind of and can form the cam member that drives zoom lens, and this cam member is made the Zoom finder that required configuration space is little easily by the engagement cam parts.
Claims (3)
1. Zoom finder, have the zoom lens that move at optical axis direction, with cylindric cam member in the cam part that forms the position of the above-mentioned zoom lens of decision on optical axis direction on the outer peripheral face, rotation by above-mentioned cam member moves on the position of decision above-mentioned zoom lens, it is characterized in that
Above-mentioned cam member is by cylindraceously axially being divided into a plurality of cam parts and combining above-mentioned, above-mentioned cam part is made by moulding, and it is being in contact with one another and is making up on the face of the equidirectional inclination of vergence direction of the cam surface of above-mentioned cam part, and above-mentioned cam member has for cam part after the combinations thereof is not separated and to the force application spring of the direction application of force that cam part is mutually combined.
2. Zoom finder according to claim 1, it is characterized in that, constitute, by being entrenched in zoom lens on the above-mentioned cam part to the acting force of above-mentioned cam part and the power that produces by the revolving force that applies to above-mentioned cam part to the face of above-mentioned inclination, be used for cam part after the combinations thereof as the masterpiece that this cam part is separated respectively, set above-mentioned force application spring to make cam part mutually combine the application of force of direction greater than above-mentioned zoom lens to the acting force of above-mentioned cam part and the above-mentioned power sum that produces by the revolving force that applies to above-mentioned cam part to the face of above-mentioned inclination.
3. according to any described Zoom finder in the claim 1～2, it is characterized in that, has turning axle, this turning axle is configured to, rotation from drive source is delivered to above-mentioned cam member, support the rotation of above-mentioned cam part simultaneously, the one end is outstanding from the end face of above-mentioned cam part, above-mentioned force application spring is installed in the volute spring on the outshot of above-mentioned turning axle by reeling, lean direction by the cam part of this helical spring axial force after to combination combinations thereof, make above-mentioned turning axle and above-mentioned cam member interlock by above-mentioned force application spring in the power of torsional direction simultaneously, the rotation of above-mentioned turning axle is delivered to cam member, and in the rotating range of the above-mentioned turning axle under the confined state of side rotation of above-mentioned cam member, torsion angle displacement by above-mentioned force application spring absorbs the transmission of the rotation of above-mentioned turning axle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP056284/2003 | 2003-03-03 | ||
| JP2003056284A JP2004264698A (en) | 2003-03-03 | 2003-03-03 | Zoom finder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1527084A CN1527084A (en) | 2004-09-08 |
| CN1307453C true CN1307453C (en) | 2007-03-28 |
Family
ID=33120042
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100061497A Expired - Fee Related CN1307453C (en) | 2003-03-03 | 2004-03-02 | Varifocal mirrorscope |
| CN 200420005826 Expired - Fee Related CN2802531Y (en) | 2003-03-03 | 2004-03-02 | Variable-focus viewfinder |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420005826 Expired - Fee Related CN2802531Y (en) | 2003-03-03 | 2004-03-02 | Variable-focus viewfinder |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2004264698A (en) |
| CN (2) | CN1307453C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4831985B2 (en) * | 2005-03-17 | 2011-12-07 | 株式会社リコー | Zoom lens driving device, zoom lens imaging device, viewfinder, camera |
| JP5762904B2 (en) * | 2011-09-20 | 2015-08-12 | 日本電産サンキョー株式会社 | Lens drive device |
| CN102854602B (en) * | 2012-08-29 | 2014-12-24 | 中国科学院长春光学精密机械与物理研究所 | Nested disc cam focusing mechanism |
| CN111580323B (en) * | 2020-06-04 | 2021-07-20 | 泰州亚泰金属有限公司 | Adjustable paraxial viewfinder |
| CN114815258B (en) * | 2022-04-29 | 2024-05-31 | 歌尔股份有限公司 | Lens cone spacing adjusting device and head-mounted equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1020173A (en) * | 1996-07-04 | 1998-01-23 | Nikon Corp | Zoom lens barrel for camera |
| US6169859B1 (en) * | 1998-01-30 | 2001-01-02 | Fuji Photo Optical Co., Ltd. | Viewfinder |
| JP2002196406A (en) * | 2000-12-22 | 2002-07-12 | Olympus Optical Co Ltd | Operation mechanism |
-
2003
- 2003-03-03 JP JP2003056284A patent/JP2004264698A/en not_active Withdrawn
-
2004
- 2004-03-02 CN CNB2004100061497A patent/CN1307453C/en not_active Expired - Fee Related
- 2004-03-02 CN CN 200420005826 patent/CN2802531Y/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1020173A (en) * | 1996-07-04 | 1998-01-23 | Nikon Corp | Zoom lens barrel for camera |
| US6169859B1 (en) * | 1998-01-30 | 2001-01-02 | Fuji Photo Optical Co., Ltd. | Viewfinder |
| JP2002196406A (en) * | 2000-12-22 | 2002-07-12 | Olympus Optical Co Ltd | Operation mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| CN2802531Y (en) | 2006-08-02 |
| JP2004264698A (en) | 2004-09-24 |
| CN1527084A (en) | 2004-09-08 |
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