CN101458387B - Lens barrel - Google Patents
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- CN101458387B CN101458387B CN2008101846892A CN200810184689A CN101458387B CN 101458387 B CN101458387 B CN 101458387B CN 2008101846892 A CN2008101846892 A CN 2008101846892A CN 200810184689 A CN200810184689 A CN 200810184689A CN 101458387 B CN101458387 B CN 101458387B
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Abstract
The invention provides a lens barrel, composed of a plurality of frame components capable of preventing the frame parts from being deformed or damaged due to impaction or drop-off. The lens barrel (1) with a projection structure comprises a moving frame (4) (first frame part) with a cam slot (4c) and a round slot (4e) on the circumference surface; a cam frame (5)(second frame part) with a cam follower (41) imbedded into the cam slot (4c) and capable of moving on the rotation direction and optical axle direction and a rotation frame (3)(third frame part) with a straight line drawing slot (3c)fastened with the cam follower (41) to make the cam frame relatively moving along the optical axle direction, and a plurality of projection parts (3e)imbedded into the round slot to make the rotation frame (3) rotate relative to the moving frame and in addition, not relative move on the optical axle direction relative to the moving frame.
Description
Technical field
The present invention relates to a kind of lens barrel, specifically, relate to constituting and having and be used to make these a plurality of members of frame at the lens barrel that stretches out mechanism of on the direction of optical axis, advancing and retreat by a plurality of members of frame etc.
Background technology
In the past, in camera that carries out photograph taking etc., in order to carry out the zoom action and to sink the trunk action, lens barrel constitutes and makes a plurality of lens holding frames that a plurality of optical lens group that constitute photographic optical system are kept free to advance or retreat on the direction of optical axis, and the camera with this lens barrel is used widely.In this case, each lens holding frames is connected by following juncture each other: for example cam follower is fastened on bayonet joint that cam engagement in the cam path or claw be fastened on slot part etc.
Generally, the camera that carries out photograph taking constitutes the user usually and can carry like a cork and walk, and takes out when needed and use.Therefore, when using camera or during the carrying camera etc., the user might unconsciously make collisions such as this camera and other structure objects, or owing to taking and placing (handling) are slipped up etc. to drop and waited on the ground.
On the other hand, be easy to carry etc., require camera self miniaturization and lightweight all the time in order to make camera.Therefore, in camera in recent years, realize miniaturization and light-weighted means, structure member attenuation such as the lens holding frames of making are for example arranged or adopt the trend of light material as being used to.
As mentioned above, when utilizing thin material or light material to constitute members of frame self in order to realize miniaturization and lightweight, the trend that exists the intensity of members of frame self to weaken.Therefore, the part of structure member, especially junction surface grade sometimes because impact or externally applied forces and be out of shape or damaged when dropping.
Therefore, about having the scheme to the lens barrel of the big structure of the patience of external force, for example TOHKEMY 2002-196215 communique etc. has proposed various schemes.
The disclosed lens barrel of above-mentioned TOHKEMY 2002-196215 communique constitutes, be supported to the circumferential groove that can counterrotating two members of frame be provided with a plurality of engaging teats and the equal number corresponding with it, by making both chimeric, thereby being supported along the state that optical axis direction is advanced and retreat integratedly.According to this structure, be not easy to produce the distortion of engaging teat or breakage etc.
Patent documentation 1: TOHKEMY 2002-196215 communique
But, as mentioned above, for example be connected by cam engagement or bayonet joint etc. each other in the lens barrel that moves constituting a plurality of members of frame, since collision or drop etc. applied under the situation of external force from front face side, this strength not only makes collision or the external force that drops etc. directly imposes on the outside surface of members of frame, and this external force is via for example being located at cam follower on the members of frame to the members of frame side transmission with the cam path that engages with this cam follower cam.
In this case, cause local stress especially to concentrate on the position of cam follower and cam path butt.Therefore, when the strength ratio of members of frame self is more weak, exist in the problem that the part generation is out of shape or damaged possibility increases that this stress is concentrated.
Below, simple declaration produces the structure under the situation of the problems referred to above in lens barrel in the past.
Fig. 6 is that the cam engagement of passing through that will constitute in a plurality of members of frame of lens barrel in the past is supported to and can counterrotating two members of frame (mobile frame and cam frame) launches to represent, illustrate simultaneously the wherein synoptic diagram of square frame parts (mobile frame) and the annexation of the members of frame (rotating frame) of bayonet joint.
In this lens barrel, cam frame 105 is provided in the inboard of mobile frame 104, is provided with rotating frame 103 at this outer circumferential side that moves frame 104.
As shown in Figure 6, mobile frame 104 has cam path 104c and circumferential groove (the symbol 104e among Fig. 6 represents the sidewall of circumferential groove).Cam frame 105 has the cam follower 141 that embeds among the above-mentioned cam path 104c.Rotating frame 103 has directly advancing groove 103c and embedding bayonet socket projection 103e among this circumferential groove 104e that moves frame 104 of engaging with above-mentioned cam follower 141.Bayonet socket projection 103e along the circumferential direction be configured in directly advance groove 103c near.
In this case, the cam follower 141 of cam frame 105 is fastened among the cam path 104c of mobile frame 104, thereby with cam frame 105 and mobile frame 104 cam engagement.Simultaneously, cam follower 141 runs through cam path 104c and is fastened on directly the advancing among the groove 103c of rotating frame 103.
Thus, rotating frame 103 rotates integratedly with cam frame 105.And cam frame 105 can move along optical axis direction with respect to rotating frame 103.
On the other hand, the bayonet socket projection 103e of rotating frame 103 embeds among the circumferential groove 104e of mobile frame 104, thus, and rotating frame 103 and mobile frame 104 bayonet joint.That is, thus, mobile frame 104 rotates relatively with respect to rotating frame 103, and mobile simultaneously frame 104 is limited to the mobile of optical axis direction.
In addition, cam follower 141 for example is provided with 3 along circumference with equal intervals.Corresponding with it, be formed with the cam path 104c of equal number, directly advance groove 103c.
According to this structure, when rotating frame 103 was subjected to rotating from the driving force of motor etc., cam frame 105 rotated integratedly with it.So cam follower 141 moves along cam path 104c, thus when making 104 rotations of mobile frame, cam frame 105 is moved along optical axis direction.
In this structure, cam follower 141 is configured to same position with the relative position relation of bayonet socket projection 103e.Therefore, as shown in Figure 6, apply in front face side under the situation of external force F of optical axis direction, apply the power of strength F1 via the sidewall of 141 couples of cam path 104c of cam follower from cam frame 105.Follow therewith, the sidewall of the circumferential groove 104e of mobile frame 104 acts on bayonet socket projection 103e.Thus, in bayonet socket projection 103e, produce reacting force FR1 opposite with above-mentioned strength F1 direction and that strength is identical.And, as shown in Figure 6, at each position of adjacent cam follower 141, cam path 104c, bayonet socket projection 103e, the same reacting force FR2 that produces with respect to the strength F2 that forms because of external force F.
Therefore, on mobile frame 104, produce bending moment in the scope that this moment, the symbol M in Fig. 6 was represented.Consequently, mobile frame 104 is out of shape shown in the double dot dash line among Fig. 6 like that.Consequently, for example as shown in Figure 6, produce be full of cracks C etc., cause the breakage of lens barrel in the end of cam path 104c.
Summary of the invention
The present invention In view of the foregoing proposes, its purpose is, a kind of lens barrel with a plurality of members of frame that are connected by cam engagement, bayonet joint is provided, it has following structure: can suppress to cause the situation of stress concentration of local because of externally applied forces such as impacting or drop, avoid the local deformation or the breakage of each members of frame.
In order to achieve the above object, the lens barrel that the present invention relates to is characterized in that in having the lens barrel that stretches out mechanism this lens barrel has: the 1st members of frame, and it has cam path, and has circumferential groove on side face; The 2nd members of frame, it has cam follower, and this cam follower is embedded in the above-mentioned cam path and can moves on rotation direction and optical axis direction; And the 3rd members of frame, its have engage with above-mentioned cam follower so that above-mentioned the 1st members of frame can on optical axis direction, relatively move directly advance groove, also have a plurality of teats that are embedded in the above-mentioned circumferential groove, so that the 3rd members of frame rotates integratedly with respect to above-mentioned the 1st members of frame, and, can not on optical axis direction, relatively move with respect to above-mentioned the 1st members of frame.
According to the present invention, a kind of lens barrel with a plurality of members of frame that are connected by cam engagement, bayonet joint is provided, it constitutes and can suppress to cause the situation of stress concentration of local because of externally applied forces such as impacting or drop, and avoids the local deformation or the breakage of each members of frame.
Description of drawings
Fig. 1 is the exploded perspective view of structure that the lens barrel of an embodiment of the invention is shown.
Fig. 2 is in a plurality of members of frame of the lens barrel that constitutes present embodiment, with the major part amplification stereogram that cam frame, mobile frame and rotating frame are extracted out and amplification is represented.
Fig. 3 is in a plurality of members of frame of the lens barrel that constitutes present embodiment, under the confined state of cam frame, mobile frame and rotating frame, illustrates along the major part amplification view in the cross section of the face that comprises optical axis.
Fig. 4 is in a plurality of members of frame of the lens barrel that constitutes present embodiment, and the major part amplification stereogram of the confined state of cam frame and mobile frame is shown.
Fig. 5 is that the cam engagement of passing through that will constitute in a plurality of members of frame of lens barrel of present embodiment is supported to and can counterrotating two members of frame (mobile frame and cam frame) launches to represent, illustrate simultaneously the wherein synoptic diagram of square frame parts (mobile frame) and the annexation of the members of frame (rotating frame) of bayonet joint.
Fig. 6 is that the cam engagement of passing through that will constitute in a plurality of members of frame of lens barrel in the past is supported to and can counterrotating two members of frame (mobile frame and cam frame) launches to represent, illustrate simultaneously the wherein synoptic diagram of square frame parts (mobile frame) and the annexation of the members of frame (rotating frame) of bayonet joint.
Symbol description
1: lens barrel; 2: fixed frame; 3,103: rotating frame 3a: cam follower; 3b: gear part; 3c, 103c: the cam frame is with directly advancing groove; 3d: use cam path for the 3rd group; 3e, 103e: bayonet socket projection; 4,104: mobile frame; 4a: guide protrusion portion; 4b: the 3rd group with directly advancing groove; 4c, 104c: cam frame cam path; 4d: directly advance groove; 4e, 104e: circumferential groove; 5,105: the cam frame; 5a: use cam path for second group; 5b: use cam path for first group; 6: directly advance lead-frame; 7: the three groups with directly advancing frame; 9: fast doorframe; 11: the second groups of frames; 12: the first groups of frames; 13: the four groups of frames 15: holding plate; 41,141: cam follower.
Embodiment
Below, the present invention will be described according to illustrated embodiment.
Fig. 1～Fig. 5 is the figure that an embodiment of the invention are shown.Wherein, Fig. 1 is the exploded perspective view of structure that the lens barrel of present embodiment is shown.Fig. 2 is in a plurality of members of frame of the lens barrel that constitutes present embodiment, with the major part amplification stereogram that cam frame, mobile frame and rotating frame are extracted out and amplification is represented.Fig. 3 is in a plurality of members of frame of the lens barrel that constitutes present embodiment, under the confined state of cam frame, mobile frame and rotating frame, illustrates along the major part amplification view in the cross section of the face that comprises optical axis.Fig. 4 is in a plurality of members of frame of the lens barrel that constitutes present embodiment, and the major part amplification stereogram of the confined state of cam frame and mobile frame is shown.Fig. 5 is that the cam engagement of passing through that will constitute in a plurality of members of frame of lens barrel of present embodiment is supported to and can counterrotating two members of frame (mobile frame and cam frame) launches to represent, illustrate simultaneously the wherein synoptic diagram of square frame parts (mobile frame) and the annexation of the members of frame (rotating frame) of bayonet joint.
In the following description, utilize symbol O to represent the optical axis of the photographic optical system in the lens barrel of present embodiment.In the direction of this optical axis O, object side is made as the place ahead, the direction of each members of frame in this lens barrel when the place ahead is made as stretches out direction.On the other hand,, the imaging side is made as the rear, the direction of each members of frame when the rear is made as the indentation direction in the direction of this optical axis O.The sense of rotation of each structure member of this lens barrel is used from the observed sense of rotation of front side and is represented.
The lens barrel of present embodiment is located on the camera, and constitute between photography state and non-photography state (heavy trunk state) displacement freely, the photography state mode that to be lens barrel be projected into the place ahead and can photograph in the direction along the optical axis O of photographic optical system, non-photography state is that this lens barrel is incorporated in the interior state of housing that the camera (not shown) of using this lens barrel waits, and the lens barrel of present embodiment is to constitute to have the Zoom lens barrel that stretches out mechanism, this stretches out mechanism when being in photography state, by a plurality of members of frame are stretched out or indentation, doubly move (zoom) thereby can become between short focal position (wide-angle position) and long focal position (position of looking in the distance).
Below, use Fig. 1～Fig. 4 that the structure of the lens barrel of an embodiment of the invention is described.
As shown in Figure 1, the lens barrel 1 of present embodiment is by constituting with the lower part: be fixed on the fixed frame 2 on the camera body (not shown); As the rotating frame 3 of the 3rd members of frame, it is by fixed frame 2 supporting, by the driving force as drive source drives motor (not shown), is being driven rotation and advances and retreat along optical axis direction when zoom and during the action of heavy trunk; As the mobile frame 4 of the 1st members of frame, it is advanced and retreat along optical axis direction, is being limited along moving relative to advance and retreat on the direction of optical axis O with respect to rotating frame 3, but can rotating; As the cam frame 5 of the 2nd members of frame, itself and rotating frame 3 rotate integratedly, with respect to rotating frame 3 along the direction of optical axis O enterprising retire moving; Directly advance lead-frame 6, its under the confined state of rotation with cam frame 5 along advancing and retreat on the direction of optical axis O; Shutter and the 3rd group of unit 32 under the confined state of rotation, are being driven along advancing and retreat on the direction of optical axis O by rotating frame 3, and its inside has tripper and as the 3rd group of frame (not shown) of dodging lens frame; Second group of frame 11 and first group of frame 12 under the confined state of rotation, are being driven along advancing and retreat on the direction of optical axis O by cam frame 5 respectively; As the 4th group of frame 13 of focusing lens frame, it is being driven when when focusing and the action of heavy trunk along advancing and retreat on the direction of optical axis O; Photographic optical system, its by remain on first group of lens (not shown) on first group of frame 12, remain on second group of lens 22 on second group of frame 11, remain on the 3rd group of lens on the 3rd group of frame and remain on the 4th group of frame 13 to focus lens promptly the 4th group of lens 24 constitute; And the holding plate 15 etc. that is fixed on the rear end of fixed frame 2.
Rear side at lens barrel 1 is equipped with image unit (not shown).This image unit is made of the structure member that comprises imaging apparatus etc., is fixed on by Screw on the rear end face of the fixed frame 2 that holding plate 15 is installed.Thus, image unit is fixed and remains on the rear side of lens barrel 1.
Fixed frame 2 forms cylindric, and perimembranous has within it: cam path 2a, and it is made of with being connected at the circumference slot part that forms on the direction of circumference the inclination cam slot part that forms on the direction that tilts with respect to optical axis O; And directly advance groove 2b, 2c what on the direction of optical axis O, form.
And, peripheral part at fixed frame 2 is provided with zoom unit 17 and focusing unit 18, zoom unit 17 is the unit that are used to carry out the zoom action of photographic optical system, by constituting as the zoom motor in zoom drive source, the gear row of driving force that transmit this zoom motor and spool gear etc., focusing unit 18 is the unit that are used to carry out the focusing action of photographic optical system, by constituting as the focusing motor of focusing drive source, gear row, feed screw and the leading axle etc. that transmit the driving force of focusing motor.
Zoom unit 17 is zoom drive mechanisms, utilize the zoom motor to drive the varifocal optical system (first group of lens, second group of lens 22, the 3rd group of lens) that helps zoom to move in the photographic optical system of this lens barrel 1, also carry out driving to non-photography state the heavy trunk action of this lens barrel 1 from photography state in direction along optical axis O.
Focusing unit 18 plays a role as the focusing driving mechanism, utilize the focusing motor in the direction along optical axis O drives the photographic optical system of this lens barrel 1, help to focus action to focus optical system (the 4th group of lens 24).
In addition, the spool gear of zoom unit 17 does not illustrate especially, rotates freely along the direction parallel with optical axis O but be supported under the state of the interior perimembranous that is exposed to fixed frame 2.
As Fig. 1～shown in Figure 3, rotating frame 3 forms cylindric, to rotate and state free to advance or retreat is embedded in the interior perimembranous of fixed frame 2.Quadrate part is formed with the cam follower 3a among the cam path 2a that is embedded in fixed frame 2 sliding freely and is engaged on gear part 3b (in particular with reference to Fig. 2) on the spool gear after the periphery of rotating frame 3.
And, have in the interior perimembranous of rotating frame 3: use cam path 3d for the 3rd group that on the direction that tilts with respect to optical axis O, forms; With at the cam frame that on the direction of optical axis O, forms with directly advancing groove 3c.This cam frame engage by the cam follower 41 with the cam frame of narrating later 5 with directly advancing groove 3c, thereby makes cam frame 5 with rotating frame 3 rotations, makes the cam frame 5 can be with respect to rotating frame 3 along mobile on the direction of optical axis O simultaneously.
In addition, as shown in Figure 1 and Figure 2, be provided with bayonet socket projection 3e in interior all rearward end of rotating frame 3, this bayonet socket projection 3e forms towards interior side-prominent.
This bayonet socket projection 3e is by in the circumferential groove 4e that embeds mobile frame 4 as hereinafter described like that, the parts that rotating frame 3 is provided with mobile frame 4 bayonet joint.Therefore, under the state of rotating frame 3 and mobile frame 4 bayonet joint, mobile frame 4 in the interior perimembranous rotation of rotating frame 3 freely, mobile simultaneously frame 4 moves to the advance and retreat along the direction of optical axis O with respect to rotating frame 3 and is limited.
Bayonet socket projection 3e is provided with 4.Wherein two are disposed side by side in the direction along optical axis O.And two other is configured to and clips the cam frame and face mutually with above-mentioned two bayonet socket projection 3e with directly advancing groove 3c.That is, two other bayonet socket projection 3e is configured as in a circumferential direction with at optical axis direction two bayonet socket projection 3e arranged side by side faces mutually, and be configured as and between them, clip the cam frame with directly advancing groove 3c.
In addition, in Fig. 4,, when showing on the mobile frame 4 that rotating frame 3 is assembled to state shown in Figure 4, be entrenched in the configuration of the bayonet socket projection 3e among the circumferential groove 4e of mobile frame 4 though rotating frame 3 is not shown.
And,,, also can constitute the present invention even be provided with two as other modes about bayonet socket projection 3e.In this case, two bayonet socket projection 3e are disposing on the direction of circumference side by side, and clip the cam frame with directly advancing groove 3c between these two bayonet socket projection 3e.
And as mentioned above, the cam follower 3a of rotating frame 3 is embedded among the cam path 2a of fixed frame 2 sliding freely, and gear part 3b is engaged on the spool gear.Therefore, the zoom motor in zoom unit 17 is driven, when spool gear is driven in rotation, and this driving force passes to rotating frame 3 via gear part 3b, thereby makes this rotating frame 3 rotations.Like this, when rotating frame 3 rotations, the cam follower 3a of this rotating frame 3 moves along the inclination cam slot part of the cam path 2a of fixed frame 2, thus, while this rotating frame 3 rotates the short focal position of forwards stretching out from predetermined heavy trunk position up to photography state.And, when this lens barrel 1 is in photography state, from short focal position to the zoom course of action the long focal position, by the circumference slot part of cam follower 3a and cam path 2a, 3 of this rotating frames are driven in sense of rotation, and can be in the direction advance and retreat along optical axis O.
And mobile frame 4 is the 1st members of frame, is provided with: along the 3rd group that forms on the direction of optical axis O with directly advancing groove 4b; The cam frame cam path 4c that on the direction that tilts with respect to optical axis O, forms; Be formed at quadrate part after the periphery, be provided with groove at circumferencial direction, and two circumferential groove 4e that the end is arranged that arrange at optical axis direction.In addition, the 3rd group all is the slot parts that run through interior periphery with cam path 4c with directly advancing groove 4b and cam frame.
This mobile frame 4 is adapted under the state of the bayonet socket projection 3e that embeds each two rotating frame 3 in two circumferential groove 4e respectively, is embedded in the interior perimembranous of rotating frame 3.Thus, mobile frame 4 is in the following manner by the 3rd members of frame of bayonet joint: can rotate relatively with respect to rotating frame 3, but can not move along relatively advancing and retreat on the direction of optical axis O with respect to rotating frame 3.
In addition, be formed with in the interior perimembranous of mobile frame 4 and directly advance groove 4d, this directly advances groove 4d and is formed at along the direction of optical axis O, embeds for the 6a of guide protrusion portion that directly advances lead-frame 6 that narrates later, limits the rotation that this directly advances lead-frame 6 thus.
The cam follower 41 of cam frame 5 is fastened on the cam frame of mobile frame 4 sliding freely with among the cam path 4c, and runs through under this fastening state, and further, the leading section of cam follower 41 embeds and be bearing in the cam frame of rotating frame 3 with directly advancing among the groove 3c.Thus, cam frame 5 becomes the 2nd members of frame, and itself and rotating frame 3 rotate integratedly, and is supported to and can moving along relatively advancing and retreat on the direction of optical axis O with respect to rotating frame 3.
Directly advance lead-frame 6 form cylindric, the rear end peripheral part have be embedded in mobile frame 4 directly advance the 6a of guide protrusion portion among the groove 4d.And directly advance lead-frame 6 and have: second group that forms in the mode of periphery in the direction along optical axis O runs through with directly advancing groove 6b; Being formed in the direction along optical axis O has first group of the end with directly advancing groove 6c on the outer peripheral face; And be formed at front, drive the nick shaped cam part 6e of barrier driving bar (not shown).
And, directly advance the state in the interior perimembranous that lead-frame 6 is configured to be embedded in the first group of frame 12 that is disposed at cam frame 5 inboards.At this moment, the 6a of guide protrusion portion that directly advances lead-frame 6 is embedded in directly advancing among the groove 4d of mobile frame 4.Thus, this directly advances lead-frame 6 is free to advance or retreat by mobile frame 4 supportings, the rotation that lead-frame 6 is directly advanced in restriction simultaneously.And the guiding teat (not shown) of first group of frame 12 is embedded in directly advance lead-frame 6 first group with directly advancing among the groove 6c.Thus, this directly advances lead-frame 6 is free to advance or retreat with 12 supportings of first group of frame, limits the rotation of first group of frame 12 simultaneously.
In addition, directly advance lead-frame 6 freely, and, move integratedly with cam frame 5 with respect to direction along optical axis O with respect to 5 rotations of cam frame.
It is cylindric that second group of frame 11 forms, and is configured to be embedded in the state of the interior perimembranous of directly advancing lead-frame 6.Substantial middle portion at this second group of frame 11 is keeping second group of lens 22, has the outstanding laterally guiding teat 11a that is provided with and the outstanding laterally cam follower 43 that is provided with on this guiding teat 11a at peripheral part.
Guiding teat 11a is embedded in second group of directly advancing lead-frame 6 with directly advancing among the groove 6b, and cam follower 43 runs through and is inserted in second group with directly advancing groove 6b, and is embedded among the second group of usefulness cam path 5a that is located at the cam frame 5 outside it in the mode that can slide.Thus, second group of frame 11 driven by cam frame 5 and advancing and retreat by directly advancing under the state that lead-frame 6 limits its rotation.
First group of frame 12 be by forming members of frame 20 cylindraceous and keep first group of lens holding frames formations such as (not shown) of first group of lens in the inside of this members of frame 20, to be positioned at the outer circumferential side that directly advances lead-frame 6 and to be embedded in the state configuration of all sides of cam frame 5.
Dispose the front opening lens baffle plate 27 freely that makes first group of lens in the inboard, front of first group of frame 12.And, in the interior perimembranous of first group of frame 12, being formed with a plurality of (for example 3) guiding teat (not shown) with equal intervals at interior Zhou Fangxiang, these guiding teats form in the direction along optical axis O, and towards interior side-prominent setting.And,, be equipped with the first group of cam follower 44 used among the cam path 5b that is entrenched in cam frame 5 toward the outer side in the outer circumferential side rearward end of first group of frame 12 corresponding with the part that disposes this guiding teat.
As mentioned above, the guiding teat of first group of frame 12 is embedded in directly advance lead-frame 6 first group with directly advancing among the groove 6c.Thus, first group of frame 12 be by directly advancing under the state that lead-frame 6 limited rotation, is being driven along advancing and retreat on the direction of optical axis O by cam follower 44 and first group of cam engagement with cam path 5b.
Shutter and the 3rd group of unit 32 are by being equipped on the 3rd group of rear end side with directly advancing frame 7, keep the fast doorframe 9 of tripper and keeping the 3rd group of frame etc. of the 3rd group of lens to constitute.
The 3rd group with advancing directly that frame 7 forms guiding teat 7a with front end of being located at each arm that the mode of extending with three directions toward the outer side forms respectively and from the further outstanding laterally cam follower 42 that is provided with of each guiding teat 7a.And the 3rd group forms to have and can make the 3rd group of frame dodge the space of dodging of abundance required outside the light path with directly advancing frame 7.
The 3rd group with directly advancing the state that frame 7 is configured to be embedded in the inside of mobile frame 4, guiding teat 7a is embedded in the 3rd group of mobile frame 4 with directly advancing among the groove 4b, runs through among the 3rd group of the 3rd group of usefulness cam path 3d that is embedded in rotating frame 3 with the cam follower 42 that directly advances groove 4b.Thus, use for the 3rd group and directly advance frame 7 under state, driving by rotating frame 3 and advancing and retreat by mobile frame 4 restriction rotations.
The 3rd group of frame is under the state in the precalculated position that is mounted to shutter and the 3rd group of unit 32, by predetermined support shaft supports with the direction parallel with the face of optical axis O quadrature on rotate freely, and be retained for respect to the 3rd group with directly advancing frame to mobile confined state along the direction of optical axis O.
The 4th group of frame 13 is the members of frame that keep the 4th group of lens 24.Be provided with long-armed 13e and the 13f of galianconism portion that extends toward the outer side in the periphery of the 4th group of frame 13.Near the leading section of long-armed 13e, be formed with the axis hole 13a that runs through insertion for the leading axle (not shown) of focusing unit 18.And, near the leading section of the 13f of galianconism portion, be formed be fastened on fixed frame 2 sliding freely directly advance the 13b of guide protrusion portion among the groove 2c.
The 4th group of frame 13 inserts the rear that is configured in fixed frame 2 inside, with respect to fixed frame 2 along free to advance or retreat on the direction of optical axis O.
Promptly, when leading axle rotates via gear row, feed screw by means of the driving force of the focusing drive source (focusing motor) of focusing unit 18, the 4th group of frame 13 is being driven along the direction of this leading axle, promptly along advancing and retreat on the direction of optical axis O, when being in photography state, be configured in suitable focusing position, when heavy trunk moves, be configured in predetermined heavy trunk position.
And, run through to be provided with peristome in the substantial middle portion of the 4th group of frame 13, fixedly maintain the 4th group of lens 24 at the inside part of this peristome.
Holding plate 15 is made of metal plate-shaped member, for example utilizes Screw etc. to be fixed on the rear end face of fixed frame 2 of lens barrel 1 of confined state.Substantial middle portion at this holding plate 15 is provided with opening 15a.Be equipped with image unit (not shown) as mentioned above at the position of this opening 15a.
Below, use Fig. 4, Fig. 5 explanation owing to reason such as impacting or drop, the effect when the front face side of lens barrel applies external force to the lens barrel of an above-mentioned embodiment of such formation.
The lens barrel 1 of present embodiment is assembled under confined state in the camera etc. and uses.In this case, for example, consider to impose on the situation of front face side of the lens barrel 1 of camera just in use by the external force that impact or drop etc. causes.
At this moment, the external force that imposes on the front face side of lens barrel 1 is transmitted to cam frame 5 from first group of frame 12.
At this moment, when the external force that passes to cam frame 5 such according to Fig. 4, arrow F shown in Figure 5, when the direction along optical axis O applied, this external force F applied the power of strength F1 with the sidewall of cam path 4c via the cam frame of 41 pairs of mobile frames 4 of cam follower of cam frame 5 from the front face side of cam frame 5.The impulsive force of this strength F1 acts on two bayonet socket projection 3e of a side relative with cam follower 41 via the sidewall of the circumferential groove 4e of mobile frame 4.Thus, on two bayonet socket projection 3e, produce direction reacting force FR11, FR12 opposite with above-mentioned strength F1, that be respectively 1/2nd strength respectively.
And as shown in Figure 5, the position at adjacent cam follower 41, cam frame cam path 4c, bayonet socket projection 3e equally also produces reacting force FR21, the FR22 relative with strength F2.
In this case, in the lens barrel 1 of present embodiment, for with the cam frame of the chimeric rotating frame 3 of cam follower 41 with directly advancing groove 3c and being entrenched in the position relation of the bayonet socket projection 3e among the circumferential groove 4e of mobile frame 4, as mentioned above, all the time practise physiognomy with two bayonet socket projection 3e that arrange at optical axis direction and dispose two other bayonet socket projection 3e over the ground, and dispose with the mode of directly advancing groove 3c between them, to clip the cam frame.
Therefore, from imposing on two positions between the bayonet socket projection 3e with directly advancing groove 3c all the time in the external force that the cam follower 41 that optical axis direction moves transmits along the cam frame.Promptly, because the external force that makes two bayonet socket projection 3e bear strength F1 equably, so the strength that each bayonet socket projection 3e bears separately is 1/2nd (F/2), its reacting force FR11, FR12 are clipped in the middle the strength F1 of above-mentioned external force and result from the parallel direction opposite with strength F1 direction.Therefore, when adopting the structure of present embodiment, when the external force of coming from the outside transmission acts on the cam frame with cam path 4c via cam follower 41, bear equably by two bayonet socket projection 3e, therefore can suppress bending moment, consequently, cam frame 5 can not produce damage.
In an above-mentioned embodiment of above explanation, when the external force of transmit from the outside acts on the cam frame with cam path 4c via the cam follower 41 of cam frame 5, by research and the mobile frame 4 of cam frame 5 cam engagement and and this move the structure of the connecting portion between the rotating frame 3 of frame 4 bayonet joint, promptly study a plurality of bayonet socket projection 3e and the configuration of directly advancing groove 3c of cam frame of rotating frame 3, can suppress cam follower 41 or cam frame cam path 4c as the inner structure part of lens barrel 1, the positions that external force acted on such as bayonet socket projection 3e distortion or damaged perhaps produces these members of frame cam engagement or the coming off etc. of bayonet joint each other.
In addition, in an above-mentioned embodiment, illustrated that circumferential groove 4e is that two, bayonet socket projection 3e are four structure example, but be not limited to this structure, as long as can proof strength, then also can form circumferential groove of configuration as described above and dispose the structure of two bayonet socket projections to clip the mode of directly advancing groove 3c.
The invention is not restricted to above-mentioned embodiment, certainly in the scope that does not break away from the invention aim, implement various distortion and application.In addition, comprise the invention in various stages in the above-described embodiment, can extract various inventions according to the appropriate combination of disclosed a plurality of constitutive requirements.For example, in the several constitutive requirements of deletion from all constitutive requirements shown in the above-mentioned embodiment, also can solve the problem of narration in the problem part that invention will solve, and obtain under the situation of the effect that the invention effect is partly narrated, deleted structure after these constitutive requirements and also can be used as invention and propose.
Claims (3)
1. lens barrel, described lens barrel has the mechanism of stretching out, and it is characterized in that, and described lens barrel has:
The 1st members of frame, it has cam path, and has circumferential groove on side face;
The 2nd members of frame, it has cam follower, and this cam follower is embedded in the above-mentioned cam path and moves on optical axis direction; And
The 3rd members of frame, its have engage with above-mentioned cam follower so that above-mentioned the 2nd members of frame on optical axis direction, relatively move directly advance groove, also have a plurality of teats that are embedded in the above-mentioned circumferential groove, so that the 3rd members of frame can rotate with respect to above-mentioned the 1st members of frame, and, can not relatively move along optical axis direction with respect to above-mentioned the 1st members of frame, these a plurality of teats are provided with two, these two teats are configuration side by side in a circumferential direction, and be configured between these two teats, clip the above-mentioned groove that directly advances, and these two teats directly advance the groove balanced configuration with respect to above-mentioned.
2. lens barrel, described lens barrel has the mechanism of stretching out, and it is characterized in that, and described lens barrel has:
The 1st members of frame, it has cam path, and has circumferential groove on side face;
The 2nd members of frame, it has cam follower, and this cam follower is embedded in the above-mentioned cam path and moves on optical axis direction; And
The 3rd members of frame, its have engage with above-mentioned cam follower so that above-mentioned the 2nd members of frame on optical axis direction, relatively move directly advance groove, also have a plurality of teats that are embedded in the above-mentioned circumferential groove, so that the 3rd members of frame can rotate with respect to above-mentioned the 1st members of frame, and, can not relatively move along optical axis direction with respect to above-mentioned the 1st members of frame, above-mentioned a plurality of teat is provided with four, wherein two teat configurations side by side on optical axis direction, two other teat is to dispose with mode that above-mentioned two teats are faced mutually at circumferencial direction, and be configured between above-mentioned two teats and above-mentioned two other teat, clip the above-mentioned groove that directly advances, and, in four teats circumferencial direction mutually in the face of and clip above-mentioned per two teats that directly advance groove and directly advance the groove balanced configuration with respect to described.
3. lens barrel according to claim 1 and 2 is characterized in that,
Above-mentioned the 2nd members of frame has the cam path different with above-mentioned cam path.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007322383 | 2007-12-13 | ||
| JP2007-322383 | 2007-12-13 | ||
| JP2007322383A JP4891213B2 (en) | 2007-12-13 | 2007-12-13 | Lens barrel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101458387A CN101458387A (en) | 2009-06-17 |
| CN101458387B true CN101458387B (en) | 2010-08-11 |
Family
ID=40769348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101846892A Expired - Fee Related CN101458387B (en) | 2007-12-13 | 2008-12-15 | Lens barrel |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4891213B2 (en) |
| CN (1) | CN101458387B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5454024B2 (en) * | 2009-09-08 | 2014-03-26 | 株式会社ニコン | Optical apparatus and imaging apparatus |
| JP5414471B2 (en) * | 2009-11-20 | 2014-02-12 | キヤノン株式会社 | Lens barrel and imaging device |
| JP2012027069A (en) * | 2010-07-20 | 2012-02-09 | Canon Inc | Lens barrel and optical instrument |
| JP5934946B2 (en) | 2011-01-24 | 2016-06-15 | パナソニックＩｐマネジメント株式会社 | Lens barrel |
| KR20140014849A (en) * | 2012-07-26 | 2014-02-06 | 삼성전자주식회사 | Lens barrel assembly and photographing apparatus having the same |
| US10877236B2 (en) * | 2014-12-26 | 2020-12-29 | Nikon Corporation | Lens barrel and camera |
| JP2021179469A (en) * | 2020-05-11 | 2021-11-18 | キヤノン株式会社 | Optical apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3288918B2 (en) * | 1996-02-21 | 2002-06-04 | 旭光学工業株式会社 | Lens barrel |
| JP3798950B2 (en) * | 2001-03-22 | 2006-07-19 | ペンタックス株式会社 | Zoom lens barrel feeding structure |
| JP4369666B2 (en) * | 2003-02-03 | 2009-11-25 | Ｈｏｙａ株式会社 | Lens barrel advance / retreat drive mechanism and advance / retreat drive mechanism |
-
2007
- 2007-12-13 JP JP2007322383A patent/JP4891213B2/en not_active Expired - Fee Related
-
2008
- 2008-12-15 CN CN2008101846892A patent/CN101458387B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009145590A (en) | 2009-07-02 |
| CN101458387A (en) | 2009-06-17 |
| JP4891213B2 (en) | 2012-03-07 |
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