JP3461259B2 - Locking device for correction means - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a locking device for a correction means for locking a correction means for performing shake correction. 2. Description of the Related Art In a current camera, all operations important for photographing, such as exposure determination and focusing, are automated. Therefore, even a person unskilled in camera operation has a very low possibility of photographing failure. ing. In recent years, a system for preventing a camera shake from being applied to a camera has been studied, and a factor which causes a photographer to fail in photographing has almost disappeared. Here, a system for preventing camera shake will be briefly described. The camera shake at the time of photographing is generally a vibration of 1 Hz to 12 Hz as a frequency. At the time of release of the shutter, even if such camera shake occurs, it is possible to take a picture without image shake. As a basic idea, it is necessary to detect the camera shake caused by the camera shake and to displace the correction lens according to the detected value. Therefore, in order to achieve a photograph that does not cause image shake even if camera shake occurs, first, it is necessary to accurately detect camera shake, and second, to correct optical axis change due to camera shake. Required. In principle, this vibration (camera shake) is detected by a vibration detection sensor for detecting angular acceleration, angular velocity, angular displacement, and the like, and an output signal of the sensor is electrically or mechanically integrated. The camera shake detecting means for outputting the angular displacement can be mounted on the camera. Then, by driving a correction optical device that decenters the photographing optical axis based on this detection information, image blur can be suppressed. Here, an outline of an anti-vibration system using vibration detecting means will be described with reference to FIG. The example of FIG. 5 is a diagram of a system for suppressing an image shake caused by a camera vertical shake 81p and a horizontal shake 81y in a direction indicated by an arrow 81. In the figure, reference numeral 82 denotes a lens barrel, 83p, 83
y is a vibration detecting means for detecting a camera vertical vibration and a camera horizontal vibration, respectively.
This is indicated by 84y. 85 is a shake correction system (87p, 87
y is a coil for applying a thrust to the shake correction system 85, 86
p and 86y are position detecting elements for detecting the position of the correction means 85. The shake correction system 85 is provided with a position control loop, and is driven by using the outputs of the vibration detection circuits 83p and 83y as target values, and The stability at the surface 88 is ensured. FIGS. 6 to 8 are views showing a shake correcting apparatus used in the above-described vibration damping system. More specifically, FIG. 6 is a plan view (FIG.
7A is a side view of the lens barrel 82 viewed from the direction of the arrow A in FIG. 6, FIG. 7B is a cross-sectional view taken along line D1-D1 of FIG. 6, and FIG. c) is a sectional view taken along line D2-D2 in FIG. 6, and FIG. 8 is a plan view seen from the back surface of FIG. In these figures, reference numeral 71a denotes a fitting frame provided at three places on the base plate 71, which is fitted into the inner periphery of the lens barrel 82 in FIG.
(See (a) and (b)). As shown in FIG. 6, shift coils 72p and 72y wound around a bobbin are fixed to the base plate 71, and a stator 74 around which a lock coil 73 is wound is fixed. The rotor 75 is attached to the main plate 71 so as to be rotatable around its axis. The rotor 75, the stator 74 and the lock coil 73 constitute a known step motor. The base plate 71 has three equally-spaced long holes 71c at three locations on its outer peripheral side surface (illustrated only in FIG. 7A, and its position is indicated by an arrow in FIGS. 6 and 7C). Is provided. A lock ring 76 is provided on the back surface of the main plate 71.
(See FIG. 8) is rotatably mounted around an arrow 78r . The pinion 75a of the rotor 75 meshes with the gear 76a, and the lock ring 76 is vibrated (rotated) around the arrow 78r in FIG. 8 by a step motor. Can be The support frame 77 for holding a correction lens (not shown) has a support shaft 77a extending in three equal parts in the outer radial direction as shown in FIGS. 6 and 7 (a). The distal end is fitted into the long hole 71c of the base plate 71. The three fitting portions are elongated holes 7 shown in FIG.
1c and the support shaft 77a, respectively, and as is apparent from the figure, the respective relationships are fixed in the direction of the optical axis 70 (see FIG. 7A) and in the direction perpendicular to the optical axis 70. Are slidable with each other (since the hole 71c is a long hole). In other words, the support frame 77 is restricted from moving in the optical axis direction with respect to the base plate 71, but can freely move in a vertical plane. When this moving direction is disassembled, it is divided into a pitch direction 78p, a yaw direction 78y, and a roll direction 78r shown in FIG. As shown in FIG. 6, a pair of tension springs 79 are hung between the pins 77b of the support frame 77 and the pins 71d of the base plate, and pull the support frame 77 from both sides. A shift yoke 711 to which a shift magnet 710 is attached is attached to the support frame 77, and faces the shift coils 72p and 72y on the base plate 71 (FIG. 7).
(B) etc.). The shift coil 7
When a current is passed through 2p, the support frame 77 is driven in the direction of arrow 78p against the elastic force of the tension spring 79, and when a current is passed through the shift coil 72y, the support frame 77 is moved in the direction of arrow 78y against the elastic force of the tension spring 79. Driven. Since no rotational force is generated in the roll direction 78r, and the support frame 77 is pulled from both sides by the tension spring 79 and is elastically restricted in this direction, the support frame 77 rotates in this direction. There is nothing. Now, based on the shake information from the shake detection circuit for detecting the camera shake, the support frame 77 is moved by arrows 78p and 78y.
When driving in the direction (by energizing the shift coils 72p and 72y), the image plane can be stabilized as described above. However, when the anti-vibration system is not used, the support frame 77 is immovable with respect to the main plate 71. It is necessary to keep. This is to prevent the support frame 77 from swinging due to disturbance vibrations when the mobile phone is carried, generating an impact sound between the support frame 77 and the base plate 71, and to avoid damage due to the impact noise. FIG. 8 shows a state at this time (when the vibration isolating system is not used). Four projections 77 e of the support frame 77 are in contact with the inner peripheral wall 76 a of the lock ring 76. Therefore, the movement of the support frame 77 in the directions of the arrows 78p and 78y is restricted. When using the anti-vibration system, the lock ring 76 is rotated by a predetermined amount clockwise in FIG. Then, the surface facing the projection 77e becomes the cam portion 76c, and the contact is separated from each other. Therefore, the support frame 77 is free with respect to the lock ring 76, and can be driven in the directions of arrows 78p and 78y. If the above-described shake correction device is summarized by element, the support frame 77, the shift magnet 710, the shift yoke 711, and the correction lens (not shown) correspond to the correction means, and the base plate 71, the shift coils 72p and 72y, and the tension springs. 79 corresponds to a support means for supporting the correction means, and a lock ring 76 and a projection 77e provided on the support frame 77 correspond to a locking means for locking the correction means. The lock coil 73, the stator 74, and the rotor 75, that is, the step motor corresponds to the driving means for driving the locking means. As described above , in the conventional example, the lock ring 76 is attached to the main plate 71 so as to be rotatable around the arrow 78r . The details of the attachment structure will be described with reference to FIG. . FIG. 9 is a diagram for explaining FIG. 8 in more detail. The base plate 71 is provided with three bayonet receiving portions 71e equally spaced in the circumferential direction. One of them (arrow A)
FIG. 10A is an enlarged view of D11-D1.
FIG. 10B shows one cross section. As can be seen from these figures, the bayonet receiving portion 71e has a structure protruding from the base plate 71 to the upper surface side and the center side of the correction lens (hereinafter referred to as overhang) and sandwiches a lock ring. Lock ring 76
(See FIG. 10B). The position regulation of the lock ring 76 in the radial direction is performed by fitting a fitting wall 71h (see FIGS. 9 and 10 (a)) provided in the same phase as the bayonet receiving portion 71e of the main plate 71 with the outer periphery of the lock ring 76. It is done in. The reason why the outer periphery of the lock ring 76 and the base plate 71 are not fitted to the entire circumference and are fitted to the three fitting walls 71h as shown in FIG. 9 is that both the base plate 71 and the lock ring 76 are formed by molding resin. This is because the circle is distorted. That is, since the entire circumferences of the distorted circles cannot be fitted with each other, the fittings are made by point contact with three projections. Here, referring to FIG.
How to attach to the base plate 71 will be described. First, when the lock ring 76 of FIG. 9 is twisted clockwise 25 degrees in a state where the lock ring 76 is detached from the main plate 71, the notches 76e (three places) of the lock ring 76 are in phase with the bayonet receiving portion 71e. Fits. For that reason,
The lock ring 76 can be dropped into the base plate 71. When the lock ring 76 is completely dropped, the lock ring 76 can rotate with respect to the base plate 71 (because the bayonet receiving portion 71e is overhanging). Next, the lock ring 76 is
When twisted 5 degrees, the state shown in FIG. 9 is obtained. Thereafter, the bayonet retaining stopper 71f is bonded to the base plate 71. Then, the lock ring 76 rotates only 20 degrees clockwise from the state of FIG. 9 (because the lock ring restricting portion 76f hits the wall 71g of the bayonet retainer 71f), and the notch portion 76e is connected to the bayonet receiving portion 71e. It will not be in phase and the bayonet will not come off. When the counterclockwise rotation is started from the state shown in FIG.
(About 5 degrees). Therefore, the lock ring 76 can be rotated counterclockwise by 5 degrees and clockwise by 20 degrees with respect to the main plate 71 from the state shown in FIG. 9, during which the support frame 77 is locked and unlocked. The bayonet receiving portion 71e shown in FIG. 10A is used to explain the state of the engagement between the lock ring 76 and the main plate 71.
FIG. 11 (a) shows a state in which the overhang portion is removed so that the fitting portion is visible, and FIG. 11 (b) shows a cross section taken along line D12-D12. In FIG. 11A, a clearance (play) a between the fitting wall 71h and the outer peripheral wall of the lock ring 76 is, for example, about 30 [μm]. This is because there is a fear that the rotation of the lock ring 76 with respect to the base plate 71 may become difficult due to the tight fitting. When the play is set in this way, as can be seen from FIG.
The play b between the lock ring 76 and the base plate 71 in the 8p direction is, for example, 60 [μm], which may be twice the set play. In FIG. 9, the projection 77e of the support frame 77
(4 places) extend radially in the directions of arrows 78p and 78y. When the play between the projection 77e and the inner peripheral wall 76a of the lock ring 76 is set, the directions 78p and 78y become the minimum play (the set play amount). (For the same reason as the play setting of the lock ring 76 and the main plate 71). In the 78p and 78y directions, either direction is the direction of gravity during normal photographing.
7 goes down by its own weight in that direction, but the amount of fall is small (because play is minimum). However, when considering the play of the support frame 77 with respect to the base plate 71, not only the play between the support frame 77 and the lock ring 76 but also the play between the lock ring 76 and the base plate 71 is included. Even if the play in the shooting direction between the support frame 77 and the lock ring 76 is small as shown in FIG.
If the play between the lock ring 76 and the base plate 71 becomes large as described in (a), the amount of eccentricity of the correction lens when photographing without anti-vibration is large (because the rock play is large), which is optically unfavorable. . Next, the bayonet retainer 71f is
1 is fixed by bonding (because there is no space for screwing), but there is a concern about the reliability when the lock ring 76 collides with the bayonet retaining 71f at a high speed (because it is bonded and fixed). May be off). Also, the step of attaching the bayonet retainer 71f to the main plate 71 and bonding the same is troublesome. [ Problems to be solved by the invention ]
In the conventional example (FIG. 9), the lock ring 76 is attached to the main plate 71.
The lock ring 76 locks the support frame 77 when attaching
In the case of a phase that is
While paying attention to the bayonet phase,
It is also necessary to fit the lock ring 76 and the support frame 77 together.
Assembly was complicated. [0036] It is an object of the present invention (the purpose of the invention), assembly
It is intended to provide a locking device for a correction means capable of improving the resistance. [0038] In order to achieve the above object , the present invention supports a correction means for correcting shake, and
A support frame having a number of protrusions and rotating in a first direction
By fitting to the plurality of protrusions of the support frame, the support frame
A locking member having a locking fitting portion for locking, and the correcting means
It has a bayonet receiving portion of the structure which projects to the side, the by said locking member is rotated in the first direction Bayone'
The bayonet connection with the locking member is performed by the
Te, and a support member for supporting the locking member, the locking
The supporting member is rotated in the first direction so that the support frame
And a second direction which is a reverse direction to the first direction.
Compensating means for unlocking the support frame by rotating
A step locking device, wherein the locking member includes a support frame.
At the point of the rotation phase where the lock of the
This is a locking device for correcting means provided with a notch portion for escaping the receiving portion . Embodiments of the present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a plan view showing a main part (particularly, a correcting means and its locking means) of a shake correcting apparatus according to a first embodiment of the present invention, and has the same functions as in FIGS. Portions are given the same reference numerals. A flexible arm 7 is provided on a base plate 71 serving as a support member.
A hook 71k is provided at the tip of 1j, and a bayonet receiving portion 71e is provided on each of the projections 77e of the support frame 77.
(Locking engagement portion with the lock ring 76). The projection 77e, which is a locking fitting portion, is arranged radially at a distance equal to four from the center of a correction lens (not shown). The projection 77e is provided below the bayonet receiving portion 71e in FIG.
The lock ring 76 and the main plate 71
Since the support fitting portions (71h, 76i) are provided,
Both the locking fitting portion and the support fitting portion are radially arranged in the same phase. FIG. 1 shows a state in which the lock ring 76 is already assembled and the support frame 77 (correction means) is locked (locked). Here, how to assemble the lock ring 76 on the base plate 71 will be described. In FIG. 1, a notch 76e is provided in the lock ring 76, and the lock ring 76 is formed so that the notch 76e is in phase with the bayonet receiving portion 71e.
Is rotated (see FIG. 2), the lock ring 76 can be dropped into the main plate 71. This is the notch 7
6e is for escaping a circular projection extending toward the inner diameter side of the bayonet receiving portion 71e, and a hook escape portion 76d provided on the lock ring 76 is escaping the hook 71k. When the lock ring 76 is incorporated into the main plate 71 as described above, the cam portion 76c escapes from the projection 77e, so that the lock ring 76 can be easily incorporated into the main plate 71. For example, when the lock ring 76 is screwed into the base plate 71 in the locking direction of the correcting means, the lock ring 76 is assembled not only in such a manner that the base plate 71 and the phase (the bayonet receiving portion 71e and the cutout portion 76e) are aligned, but also. The fitting of the projection 77e of the support frame 77 and the lock ring inner peripheral wall 76a also needs to be performed, which complicates the assembly. When bayonet coupling is performed by twisting in the unlocking (unlocking) direction of the correcting means as in this configuration, it is not necessary to engage with the correcting means, so that assembly can be simplified. become. The lock ring 7 dropped into the main plate 71
If you rotate 6 counterclockwise, hook 71k
Rides on the end of the hook escape portion 76d and the stepped portion 76h
To go (the head of the hook 71k, and, hook clearance portions 7
6d is tapered in this direction, and the hook 71k is provided on the flexible arm 71j). When the rotation is continued, the state shown in FIG. 3 is reached. In this state, the tip of the hook 71k is caught by the stepped portion 76h of the lock ring 76, so that the lock ring 76 is rotated clockwise. Also, rotation can be prevented by the hook 71k and the stepped portion 76h. Therefore, the lock ring 76 can be rotated counterclockwise from the state shown in FIG. 3 until the lock ring restricting portion 76g comes into contact with the main plate projection 71i, and the support frame 77 is locked and unlocked between these angles. . Since the lock ring 76 cannot be rotated clockwise from the state shown in FIG. 3, the notch 76e and the bayonet receiving portion 71e do not match in phase, and the lock ring 76 does not come off from the main plate 71. . The hook 71k allows the lock ring (locking portion) 76 to rotate in the counterclockwise direction (first direction) in the state shown in FIGS. 2 and 3 (the tip of the hook 71k is tapered, and Since 71k is provided on the flexible arm 71i), it has a role as a rotation restricting member that restricts rotation in the clockwise direction (second direction), whereby the lock ring 76 is installed in the bayonet. At this time, the bayonet retaining stopper 71f unlike the conventional example is not required. Therefore, not only the assembly becomes extremely simple and compact, but also the reliability can be increased because the bayonet retainer 71f is not attached by bonding as in the prior art (there is no situation where the adhesive comes off). . When the lock ring 76 is bayonet-coupled to the main plate 71 (see FIG. 2), the lock ring 76 is in a state where the support frame 77 is unlocked. Therefore, when the lock ring 76 is assembled to the main plate 71, it is not necessary to assemble the lock frame 76 while fitting the support frame 77 and the lock ring 76 together. Is the locking phase,
The lock ring 76 and the base plate 71 are assembled while paying attention to the fitting and the bayonet phase.
It is necessary to also fit the support frame 77 and the support frame 77, which complicates the assembly) and improves the assemblability. That is, when the lock ring 76 serving as the locking member rotates counterclockwise (first direction) and is bayonet-coupled to the main plate, the lock ring 76 rotates counterclockwise (first direction). The support frame 77 is locked (locked) by rotating, and the support frame 77 is unlocked (unlocked) by turning clockwise (second direction), thereby simplifying the assembly. . FIG. 4 is an enlarged view of a fitting portion between the main plate 71 and the lock ring 76. In FIG. 4, a fitting wall 71h is provided below the paper of the bayonet receiving portion 71e.
6 is fitted to the outer peripheral wall 76i. In order to make the rotation of the lock ring 76 relative to the main plate 71 smooth, the lock rings 76 actually face each other with a slight clearance. In FIG. 4, since the fitting wall 71h and the lock ring outer peripheral wall 76i face each other along the line segment 42,
The play in the direction of the arrow 41 is the least, and the play in the direction different from that direction is larger (see FIG. 11).
(Same as described using (a).) Since the projection 77e of the support frame 77 and the inner peripheral wall 76a of the lock ring 76 also face each other along the line segment 42, there is the least play in the direction of arrow 41. That is, the lock ring 76 and the support frame 77 are fitted along the line segment 42 and the lock ring 76 and the base plate 7
1 is carried out, the support frame 77 and the main plate 71
The direction of the arrow 41 is the smallest in the play between the locks. As described above, the lock ring 76 and the support frame 7
Since the fitting portions 7 (four locations) and the fitting portions (four locations) of the lock ring 76 and the main plate 71 are all arranged in a row as shown in FIG. 4, play in the arranged direction is minimized. I have. still,
It is not always necessary to arrange them in a single row, and it is sufficient if they are substantially in a single row. As described in the conventional example, the projection 77e and the inner peripheral wall 76a of the lock ring are arranged so as to minimize the backlash in the normal photographing posture. The fitting portion between the lock ring 76 and the support frame 77 and the fitting portion between the lock ring 76 and the base plate 71 are arranged in the same phase radially from the center of the lock ring 76. As a result, the total locking play from the support frame 77 to the main plate 71 can be minimized. As a result, it is possible to prevent the optical performance from deteriorating due to the locking play when the correcting means is locked. The description of each embodiment of the present invention is completed above. Here, the configuration, effects, and the like will be enumerated below while showing the correspondence between the present invention and each embodiment. 1) Correction means for correcting shake (support frame 7)
7) a device having a locking member (lock ring 76) for locking by rotating in the first direction and unlocking by reversing, the locking member is a support member for supporting the locking member. After being rotated in the first direction and bayonet-coupled to the (base plate 71), and after being bayonet-coupled,
A configuration is provided in which a rotation restricting member (hook portion 71k) that allows rotation of the locking member in the first direction and restricts the amount of rotation in the reverse direction is provided. As a result, the attachment of the locking member to the support member is simplified, and since the bayonet connection is not released, the reliability of the attachment is improved. Further, a plurality of engagement portions (projections 77 e and lock ring inner peripheral wall 76 a) with the correction means of the locking member (lock ring 76) for locking the correction means (support frame 77) for correcting the shake. In the vicinity, a support member (base plate 71) that rotatably supports the locking member and a support fitting portion of the locking member (the fitting wall 71h and the lock ring outer peripheral wall 76i ) are arranged. More specifically, a plurality of locking fittings radially provided on the locking member (lock ring 76) for locking the correction means by rotation (or may be provided on the correction means side for correcting vibration). Support member (base plate 71) for supporting the joint (projection 77e and lock ring inner peripheral wall 76a) and the locking member
A plurality of support fitting portions (fitting wall 71h and lock ring outer peripheral wall 76i) radially provided (may be provided on the locking member) are arranged in the same phase (one row). As a result, the lock play between the correction means and the support member can be reduced, and the locking play can be minimized. (Modification) The present invention is suitable for a camera such as a single-lens reflex camera or a video camera, but is not limited to this. It is also possible to apply to an optical device to be used. The present invention is not limited to the configuration of each of the above embodiments, but may be any configuration that can achieve the functions described in the claims or the functions of the embodiments. Needless to say, there may be. Further, the present invention may have a configuration in which the above embodiments or their techniques are appropriately combined. As described above, according to the present invention, it is possible to provide a locking device for correcting means that can improve assemblability . [0074]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a locked state of a correction unit in a shake correction device according to a first embodiment of the present invention. FIG. 2 is a plan view showing an assembled state of a lock ring in the shake correction apparatus according to the first embodiment of the present invention. FIG. 3 is a plan view showing an unlocked state of a correction unit in the shake correction apparatus according to the first embodiment of the present invention. FIG. 4 is an enlarged view showing a main part of FIG. 1; FIG. 5 is a perspective view showing a schematic configuration of a conventional anti-vibration system. FIG. 6 is a plan view showing a main part of a conventional shake correction apparatus. 7 is a diagram illustrating a side surface and a cross section taken along line D1-D1 and D2-D2 of the shake correction apparatus illustrated in FIG. FIG. 8 is a plan view as seen from the back surface of the shake correction device of FIG. 6; FIG. 9 is a plan view showing the shake correction apparatus of FIG. 8 in detail. FIG. 10 is a diagram for explaining locking play of a correction unit in a conventional shake correction device. FIG. 11 is a view for explaining locking play of a correction unit in the conventional shake correction apparatus. [Description of Signs] 71 Main plate 71e Bayonet receiving portion 71h Fitting wall 71k Hook portion 76 Lock ring 76i Lock ring outer peripheral wall 76a Lock ring inner peripheral wall 77 Support frame 77e Projection

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-87045 (JP, A) JP-A-9-61881 (JP, A) JP-A-8-87046 (JP, A) JP-A-7-87 301767 (JP, A) JP-A-8-76164 (JP, A) JP-A-6-339050 (JP, A) JP-A-10-48682 (JP, A) JP-A-10-186431 (JP, A) JP-A-10-221726 (JP, A) JP-B-57-37852 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 5/00

Claims (1)

(57) [Claims] [Claim 1] A correction means for correcting a shake is supported, and
And a support frame having a projection in the first direction.
The support frame is engaged with a plurality of protrusions of the support frame.
A locking member having a locking fitting portion for locking, and the correction means side
A bayonet receiving portion having a structure protruding to the side, wherein the locking member is rotated in the first direction so that the bayonet
By performing bayonet coupling with the locking member by a receiving portion ,
And a support member for supporting the locking member, the locking portion
The member rotates the support frame by rotating in the first direction.
Stop in a second direction which is a reverse direction to the first direction.
For correction means that releases the locking of the support frame by rotating
A locking device, wherein the locking member is provided with an engagement of the support frame.
At the point of the rotation phase where the stop is released,
A notching portion for escaping the portion is provided .