JP5288811B2 - Lens barrel and optical apparatus having the same - Google Patents

Description

  The present invention relates to a lens barrel suitable for optical equipment such as a digital still camera, a video camera, and a television camera. In particular, a lens barrel having a shake correction device that detects vibration (camera shake) generated in an optical apparatus during photographing and corrects image shake by moving a lens (shake correction means) in a direction perpendicular to the optical axis. It is about.

  Currently, in an optical apparatus (camera) such as a digital camera, operations related to photographing such as exposure determination and focusing are almost automated.

  As a result, a high-quality image can be easily obtained. Further, when image blur occurs due to camera shake, the image quality is greatly lowered. For this reason, in many optical devices, an image blur correction device (an image stabilization system) that corrects an image blur is often used.

  Here, an image blur correction system (an image stabilization system) that corrects image blur due to camera shake will be briefly described.

  In many cases, camera shake at the time of shooting is usually 1 to 12 Hz as a frequency. The basic idea for making it possible to take a picture without image blur at the time of shutter release is to detect camera vibration due to the above-mentioned camera shake, and depending on the detected value. Then, the correction lens can be displaced.

  Accordingly, in order to obtain an image that does not cause image shake even if camera shake occurs, first, the camera vibration is accurately detected, and second, the optical axis (photographing optical axis) change caused by the camera vibration is corrected. Is corrected by appropriately displacing.

  In principle, this vibration (hand shake) is detected by means of vibration detection means for detecting acceleration, angular velocity, etc., and camera shake detection means for electrically integrating the output signals of the vibration detection means and outputting displacement. Can be carried out by mounting on a camera.

  Then, based on this detection information, the image blur can be corrected by displacing the correction lens (shake correction means) in the direction perpendicular to the optical axis and changing the photographing optical axis.

  FIG. 13 is a schematic view of a main part of a lens barrel having a vibration isolation system used in many conventional optical devices.

  In the image stabilization system of FIG. 13, the image blur caused by the camera vertical shake (pitch direction) 81p and the camera horizontal shake (yaw direction) 81y in the direction of the arrow 81 is suppressed.

  Reference numeral 82 denotes a holding frame. Reference numerals 83p and 83y denote shake detection means for detecting camera vertical shake vibration and camera horizontal shake vibration, respectively, and the respective shake detection directions are indicated by arrows 84p and 84y.

  Reference numeral 85 denotes shake correction optical means, and 86p and 86y denote coils for applying thrust to the shake correction optical means 85, respectively. 87p and 87y are detection elements for detecting the position of the shake correcting optical means 85. The coils 86p and 86y and a magnet (not shown) constitute an electromagnetic actuator to drive the shake correction means 85. Further, the shake correction optical means 85 is provided with a position control loop, and is driven with the outputs of the shake detection means 83p and 83y as target values to ensure stability on the image plane 88.

  The positional restriction of the shake correction optical means in the shake correction apparatus in the optical axis direction is important. As this position restriction, a lens barrel having a configuration held by a rolling ball is known (Patent Documents 1 and 2).

  Patent Document 1 discloses a configuration in which a compression spring is arranged outside the shake correcting optical means in order to pressurize the three rolling balls and the shake correcting means in the direction of the rolling balls.

Further, Patent Document 2 discloses that three rolling balls and three tension springs are used as pressure to the rolling balls.
JP 2001-290184 A JP-A-10-254015

  In the lens barrel of Patent Document 1, the holding member (shift barrel) of the shake correction means is pressed by a compression coil spring having a larger inner diameter than the three balls. For this reason, when the outer diameter of the holding member of the shake correction means is increased, the configuration tends to increase in size.

  In addition, when the shake correction area becomes wider, the amount of deformation of the compression spring in the direction perpendicular to the compression direction also increases. Therefore, in addition to the compression spring force, a moment force to the compression spring works between the shake correction means and the holding portion (base plate), and the shake correction control may be difficult.

  In the shake correction apparatus of Patent Document 2, the holding member of the shake correction means is pressurized with a tension spring. At this time, it is greatly influenced by the friction generated between the spring holding portion and the hook portion of the tension spring in the hook portion of the tension spring, or the moment force of the tension spring due to the sliding.

  Specifically, when the shake correction means moves to perform shake correction, the tension spring receives force in the direction perpendicular to the optical axis in addition to the tension direction. At this time, if the friction between the spring holding portion and the tension spring hooking portion is large, it acts as a force that bends the tension spring, which affects the driving force for shake correction and makes smooth control difficult.

  In addition, when the shake correction region becomes large, the influence of the moment force described above is superior to friction, and slipping occurs. At this time, stick-slip is generated, and a sound of spring is generated.

  Patent Document 2 does not specifically describe anything in this regard.

  In general, when holding a shake correction means using a rolling ball, if the structure of the holding part for hooking a hook part of a tension spring used as a pressing means for the rolling ball is improper, friction or The adverse effect (controllability, sound generation) due to the occurrence of slipping and the like is increased.

  It is an object of the present invention to provide a lens barrel having a shake correction device that can set these members appropriately and perform stable shake correction control, and an optical apparatus having the lens barrel.

A representative configuration of a lens barrel according to the present invention is a lens barrel used in an optical apparatus, and is based on a shake detection unit that detects vibration generated in the lens barrel and a signal from the shake detection unit. A shake correction unit that holds an image shake correction lens that moves to have a component orthogonal to the optical axis of the lens barrel and corrects the image shake, and a ground plane that holds the shake correction unit movably. Three rolling balls arranged uniformly or substantially uniformly around the optical axis for regulating the position of the shake correction means in the optical axis direction, and between the ground plate and the shake correction means so that the rolling balls roll. A tension spring that is held in a state in which both are biased, and the shake correction means and the ground plate each have a holding portion that latches a hook portion of the tension spring, and the deflection spring When the correction means moves and corrects image blur As the spring is displaceable in a state of being latched by the two holding portions, at least one of the two retaining portions are configured, at least one of the two holding portion includes a cylindrical shape A part of the columnar shape has a small-diameter portion having a smaller diameter than the diameter of the cylindrical cross- section, and the hook portion of the tension spring is hooked on the small-diameter portion. The tension spring is configured to be displaceable about the small-diameter portion, and when cut by a plane that includes the small-diameter portion and is perpendicular to the extending direction of the columnar shape, A protrusion is formed, and the protrusion is not in contact with the tension spring even when the tension spring is displaced by the maximum amount around the small diameter portion by the movement of the image blur correction lens. And
Further, another representative configuration of the lens barrel according to the present invention is a lens barrel used in an optical apparatus, and includes a shake detection unit that detects vibration generated in the lens barrel, and the shake detection unit. Based on this signal, a shake correction unit that holds an image shake correction lens that moves to have a component orthogonal to the optical axis of the lens barrel and corrects the image shake, and holds the shake correction unit movably A ground plate, three rolling balls arranged uniformly or substantially uniformly around the optical axis for regulating the position of the shake correction means in the optical axis direction, and the ground plate and the shake correction so that the rolling balls roll. And a tension spring that is held between both of the biasing means and the bias correction means and the ground plate each have a holding portion that latches the hooking portion of the tension spring. When the shake correction means moves to correct image shake As the tension spring is displaceable in a state of being latched by the two holding portions, at least one of the two retaining portions are configured, at least one of the two holding portions, cylindrical wherein the shape, the recess provided in the portion of the circular pillar shape, the circular column shape small diameter portion having a smaller diameter than the diameter of the cross section of the circular pillar shape when taken along a plane perpendicular to a direction of extension of the circular pillar shape The tension spring has a shape formed along the recess, and the hook portion of the tension spring is hooked on the small diameter portion so that the tension spring can be displaced around the small diameter portion. In addition, even if the tension spring is displaced by the maximum amount around the small-diameter portion by the movement of the image blur correction lens, the tension spring is configured not to contact a portion other than the small-diameter portion . It is characterized by that.
An optical apparatus having the lens barrel also constitutes another aspect of the present invention.

  In the present invention, in the holding of the shake correction means using the rolling ball, the structure of the holding part for hooking the hooking part of the tension spring used as the pressing means for the rolling ball is made appropriate. As a result, a lens barrel having a shake correction device capable of performing stable shake correction control with less adverse effects (controllability, sound generation) due to the occurrence of friction, slip, and the like can be obtained.

  The best mode for carrying out the present invention will be described by the following examples.

  The lens barrel of the present invention is used for optical equipment such as a digital still camera, a video camera, a video camera, and a television camera.

  FIG. 1 is a cross-sectional view of a main part of a lens barrel of Embodiment 1 of the present invention. The lens barrel of the first embodiment is a zoom lens as a single-lens reflex camera.

  In the drawing, the configuration above the center line represents the configuration at the wide-angle end of the zoom lens, and the configuration below the center line represents the configuration at the telephoto end.

  An outline of the lens barrel of the present embodiment will be described.

  In FIG. 1, L1 to L6 are lens groups. A part of the lens groups L1 to L6 is configured to advance and retract in the direction of the optical axis in accordance with the advance and retreat of the zoom operation ring 1 and to change the focal length. An operation rubber 1a is arranged on the zoom operation ring 1 so as to be easily operated on the outer periphery. A claw 1b to which a hood can be attached is disposed at the front end, and a focus operation ring 2 and a zoom operation adjustment ring 3 are disposed at the rear end. By rotating the zoom operation adjustment ring 3, the frictional force with the fixed cylinder 4 inside the zoom operation adjustment ring 3 changes, and the operation weight of the zoom operation ring 1 can be adjusted.

  Reference numeral 5 denotes a rectilinear cylinder that moves forward and backward in the optical axis direction together with the zoom operation ring 1 and the first group lens barrel 13 that holds the lens group L1. The rectilinear cylinder 5 is provided with a cam 5a, and the cam follower of the cam 5a is fixed to the cam ring 6. Therefore, the rectilinear cylinder 5 rotates and moves out as the first group barrel 13 advances and retreats.

  The amount of movement of the cam ring 6 in the optical axis direction is the same as the amount of movement of the fifth group barrel (shake correction device) 12 in the optical axis direction. The fifth group lens barrel 12 is fixed to the fifth group moving cylinder 11, and the cam follower fixed to the fifth group moving cylinder 11 slides in a circumferential groove (not shown) provided in the cam ring 6. Only the moving component in the optical axis direction of the rotational extension of 6 is transmitted to the fifth group barrel 12.

  Reference numeral 7 denotes a guide cylinder which is a fixed element. In the fixing element 7, a known focus unit 8 indicated by a hatched portion is fixed to a rear step portion having a two-step shape (cylindrical shape). A fixed cylinder 4 and a mount portion 9 are fixed to the rear end portion with screws. Reference numeral 10 denotes a drip-proof rubber which prevents water from entering the mount portion 9 when it is attached to the camera.

  The movement locus of the second group barrel 14 is a cam follower fixed to the focus cam ring 15 in a guide groove parallel to the optical axis provided in the cam ring 6 and a cam 11 a provided in the fifth group movement cylinder 11. The focus cam ring 15 moves when the rotation is extended.

  At this time, the second group barrel 14 itself advances and retreats without rotating. The second group lens barrel 14 holds the focus group L2. The output from the focus unit 8 and the rotation operation of the focus operation ring 2 are transmitted to the rotation of the focus key 16 and the second group barrel 14 is rotated. Note that the lens barrel of this embodiment holds the zoom lens in which the amount of extension of the focus lens group varies depending on the focal length, so that the second group can be obtained by changing the use area of the focus cam by rotating the focus cam ring 15. The feeding amount of the lens barrel 14 is changed.

  The third group lens barrel 18 that holds the lens unit L3 and to which the aperture unit 17 is fixed is arranged in a cam groove 6a provided in the cam ring 6 and a straight groove provided in the fifth group moving cylinder 11. The cam follower integrated with the cylinder 18 slides forward and backward in the optical axis direction. Similarly, the fourth group lens barrel 19 holding the lens unit L4 is also a cam integral with the fourth group lens barrel 19 in the cam groove 6b provided in the cam ring 6 and the straight groove provided in the fifth group moving cylinder 11. The follower slides back and forth in the optical axis direction.

  Similarly, the sixth lens barrel 20 holding the lens unit L6 has a cam follower integrated with the sixth lens barrel 20 in the cam groove 6c provided in the cam ring 6 and the straight groove provided in the guide tube 7. It slides forward and backward in the optical axis direction by sliding.

  Reference numeral 21 denotes a tripod seat, which is provided with a screw portion 21a so that it can be fixed to a tripod or the like. Reference numeral 21 denotes a lens barrel control circuit, which is fixed to the guide tube 7 in a state where a plurality of plane portions are formed so as to surround the optical axis. Further, the control circuit 21 is electrically connected to a contact point 22 for electrical connection with the focus unit 8 and the camera by connection means (not shown). The control circuit 21 is connected to the shake correction device 12 and the diaphragm unit 17 by a flexible printed board (not shown). Further, a vibration gyro which is a shake detection means for determining a drive target of the shake correction device 12 is soldered onto the control circuit 21 and fixed to the guide cylinder 7 via rubber.

  The fifth group barrel 12 in the lens barrel of the present embodiment constitutes a shake correction device as described above. Next, the configuration of the shake correction apparatus will be described with reference to FIGS.

  FIG. 2 is an exploded perspective view of the lens barrel. FIG. 3 is an exploded perspective view of FIG. 2 viewed from the opposite side.

  4 is a front view of the shake correction device 12 of FIGS. 2 and 3, and FIGS. 5, 6, and 7 are AA sectional view, BB sectional view, and CC sectional view in FIG. 4, respectively. Yes. The same numbers in the drawings represent the same members.

  In the lens barrel of this embodiment, a roller seat 30a (three places are shown in the figure, but one is shown) provided on the outer periphery of the base plate 30 (support means) is provided on the fifth group moving cylinder 11. A known lens barrel roller (not shown) that fits into the mounting hole is screwed. Accordingly, the fifth group moving cylinder 11 is fixed to the main plate 30. The first yoke 32 of magnetic material is fixed to the ground plate 30 by being screwed into the holes 30b of the ground plate 30 with four screws 34 penetrating through the four holes 32a.

  A permanent magnet 33a (shift magnet) such as a neodymium magnet is magnetically attracted and fixed to the first yoke 32.

  L5 is a 5-group lens group (image blur correction lens group) as an optical element for image stabilization. A shift coil 35 is bonded and fixed to the support frame 31 (shake correction means) to which the fifth group lens unit L5 is fixed by caulking, and a light projecting element 36 such as an IRED is also bonded to the back surface of the support frame 31. The light beam from the light projecting element 36 enters the position detecting element 40b such as PSD through the slit 31a.

  These elements 36, 31a, 40b detect the position of the support frame 31 (shake correction means) in the pitch direction and the yaw direction. Further, the end of each coil wire is soldered to the shift FPC 35a.

3 between the three cylindrical projections (holding portions) 31b (three locations) provided on the outer periphery of the support frame 31 and the cylindrical projections 30c (holding portions) (three locations) provided on the base plate 30. The support frame 31 is always urged toward the main plate 30 by the shift springs 37 being engaged. The protrusion 31b may be a column shape. For example, a prismatic shape may be used.

  The shape of the columnar protrusions 31b and 30c will be described later. A rolling ball 38 is provided on the first yoke 32 uniformly or substantially uniformly around the optical axis. A rolling ball 38 provided between the first yoke 32 and the support frame 31 regulates the position of the support frame 31 in the optical axis direction. Since the rolling ball 38 is arranged in the same phase as the shift spring 37, it can move without load when the support frame 31 moves in the direction perpendicular to the optical axis.

  The three shift springs 37 and the rolling balls 38 are arranged uniformly or substantially uniformly (120 ° ± 10 °) around the circumference.

  Reference numeral 44 denotes an L-shaped shaft (nonmagnetic stainless steel), one end of which is supported by the support frame 31 and the other end of which is supported by a bearing portion (not shown) formed on the ground plate 30. Accordingly, the support frame 31 can move in the plane perpendicular to the optical axis with respect to the base plate 30 but cannot rotate around the optical axis.

  Note that the engagement play between the bearing portion of the L-shaped shaft 44 and the base plate 30 and the support frame bearing portion is set large in the optical axis direction, and the optical axis by the rolling ball 38, the first yoke 32, the support frame 31 and the like. This prevents overlapping fitting with the direction regulation.

  A plurality of protrusions are formed on the surface of the second yoke 39, on which a shift substrate 40 on which a position detection element 40b, an output amplification IC (not shown), a connection connector 40c, and the like are mounted abuts. Then, the positioning dowels 30d of the base plate 30 are fitted into the positioning holes 40a (two locations), the position is determined, and the second yoke 39 is screw-coupled by two screws 41a, and the shift substrate 40 is further coupled by two screws 41b. And the base plate 30 are combined.

  A plurality of contact portions between the shift substrate 40 and the second yoke 39 are designed so that the wiring pattern does not touch except for one place, and the disconnection of the pattern due to the contact is prevented. It should be noted that only one portion is in contact with the portion where the ground pattern is exposed, and the second yoke 39 is grounded (earthed) to prevent elements in the shift substrate 40 from being damaged by static electricity.

  Further, the insulating sheet 42 is sandwiched and held between the second yoke 39 so as not to conduct at a place other than the protrusion.

  On the opposite surface of the second yoke 39, a permanent magnet 33b having the same shape as the permanent magnet 33a is magnetically attracted and fixed.

  From the above, a closed magnetic path is formed by the first yoke 32, the permanent magnet 33a, the permanent magnet 33b, and the second yoke 39, and the support frame 31 is perpendicular to the optical axis as a shake correction means by energizing the shift coil 35 in the magnetic circuit. Driven by.

  Further, the first yoke 32 and the second yoke 39 are attracted by the magnetic attractive force at the portion where the magnets are opposed to each other by this magnetic circuit. For this reason, the second yoke 39 does not flutter or cause a positional shift even if the base plate 30 is fixed together with the shift substrate 40 only by screws 41b.

  However, since this magnetic attraction force is strong, in this embodiment, four non-magnetic (brass) shafts 43 are fixed between the first yoke 32 and the second yoke 39 to prevent the deformation of the main plate 30. ing. The shape of the shaft 43 is formed with a large diameter because each yoke contact portion receives pressure, and the portion where the shift coil 35 moves is formed with a small diameter to prevent interference.

  In addition to being soldered to the shift coil 35, the shift FPC 35a is also soldered to two IREDs 36 that are bonded to the support frame 31 at positions facing the position detection elements 40b mounted on the shift board 40. . The position detection element 40b and the IRED 36 constitute an element of shake detection means.

  Reference numeral 35 c denotes a connection portion that is inserted into a connector mounted on the shift board 40. There are a plurality of bent portions between the connecting portion 35c and the IRED 36 and the portions to be soldered, and the shift FPC 35a is not stretched even if the support frame 31 is shifted by the elasticity of the bent portions.

  Thus, the IRED 36 and the shift coil 35 are energized from the shift substrate 40 via the shift FPC 35a.

  In addition to the first yoke 32, a first lock yoke (not shown) is fixed to the base plate 30 with screws, and a lock magnet 48a is magnetically coupled.

  The lock ring 45 has four lock cam portions 45a on the inner peripheral side, and the support frame 31 is formed with a protrusion 31c in the same phase as the lock cam portion 45a in the optical axis direction. Therefore, when the rotation phase of the protrusion 31c is shifted from the lock cam 45a due to the rotation of the lock ring 45 (that is, the protrusion 31c and the inner peripheral portion 45f of the lock ring 45 are in contact), the locked state (moving) Is a locked state). In addition, when the rotation phases of the lock cam portion 45a and the projection portion 31c are in alignment, the lock cam portion 45a and the projection portion 31c are in an unlocked state (non-locking state) in which they can move freely within the optical axis vertical plane.

  A lock coil 49 is bonded to the flat surface portion 45 c of the lock ring 45, and the tip of the coil wire is soldered and connected by a tip exposed portion 46 b of a lock FPC 46 attached to the outer periphery of the lock ring 45. A photo interrupter 46a for detecting the position of the lock ring 45 is mounted on the lock FPC 46, and the light shielding portion 45k formed on the lock ring 45 passes through this position to detect the position.

  Further, since the lock ring 45 rotates, the lock FPC 46 has a U-turn portion 46d so as not to be loaded by being pulled during rotation, and this portion absorbs the rotation of the lock ring 45.

  Reference numeral 51 denotes a lock rubber, which is a portion that restricts the lock ring 45 from coming off and restricts the lock end and unlock end of the lock ring 45. The position of the lock rubber 51 is regulated by a recess 47 a provided in the second lock yoke 47 and the hole 30 e of the base plate 30. When the second lock yoke 47 is fixed to the base plate 30 by screws 50, the lock rubber 51 is sandwiched between the first yoke 32. It becomes the composition to be.

  This prevents the lock rubber 51 itself from coming off. A lock magnet 48b is magnetically coupled to the second lock yoke 47, and forms a magnetic circuit together with the first lock yoke described above. By energizing 49 coils in the magnetic circuit, the lock ring 45 is Rotate.

  In the lock ring 45, lock sliders 53 (see FIG. 4) made of slipper resin are in contact with each other in three circumferential directions, and the lock slider 53 itself moves in the optical axis direction in the plane perpendicular to the optical axis by the lock spring 52. Is energized. Therefore, there is a backlash between the lock ring 45 and the main plate 30, but since it is urged in three places in the circumferential direction, it is held without rattling.

  The base plate 30 and the lock slider 53 with which the lock spring 52 abuts are provided with a convex portion smaller than the inner diameter of the lock spring 52, which serves both as positioning of the lock spring 52 and prevention of detachment.

  Next, the relationship between the incorporation of the lock ring 45 and the lock slider 53 will be described with reference to FIGS. For the sake of simplicity, the second lock yoke 47, the lock magnet 33b, and the screw 50 are shown for convenience.

  First, the lock spring 52 and the lock slider 53 are inserted into the recesses of the base plate 30 at three locations. Next, the lock ring 45 is pushed into the main plate 30 with the phase of the lock ring notches 45 d (five locations in FIG. 3) of the lock ring 45 aligned with the inner diameter protrusions 30 h (five locations) of the main plate 30. At this time, the lock slider 53 and the lock ring 45 abut, but the tip of the lock slider is hemispherical, and the abutment portion of the lock ring 45 is finished with a curved surface, so that it can be incorporated as it is.

  Thereafter, the lock ring 45 is turned in the unlocking direction (clockwise direction in the figure) to be connected to the main plate 30 with a bayonet. As a result, the lock ring 45 is restrained in the optical axis direction with respect to the base plate 30 and can rotate about the optical axis.

  The lock ring 45 is rotated counterclockwise so that the lock ring notch 45d is again in phase with the protrusion 30h and the bayonet coupling is removed, and the lock rubber 51 of the elastic member is removed from the hole of the base plate 30. Insert and fix in 30e.

  As a result, the protrusion 45e of the lock ring 45 is restricted by the lock rubber 51 and restricted so that it can only rotate between 45f. When the protrusion 45e and the lock rubber 51 are in contact with each other, the lock state is established, and when 45f and the lock rubber 51 are in contact with each other, the unlock state is established.

  The lock rubber 51 surrounds a substantially half circumference of the outer periphery by a convex portion around the base plate 30 and adheres to this portion to regulate the fall of the lock rubber 51 itself. When the second lock yoke 47 is fixed to the base plate 30 with the two screws 50, the second lock yoke 47 is inserted into the recess 47a and slightly charged in the optical axis direction to prevent it from coming off.

  FIG. 9 is an explanatory view showing a state in which the lock rubber 51 is assembled and locked. At this time, the lock slider 53 is in contact with the first inclined surface 45g provided on the outer periphery of the lock ring 45 in a biased state. Therefore, the urging force of the lock slider 53 is urged in the optical axis direction, but the lock ring 45 is also urged counterclockwise in the figure from the direction of the inclined surface 45g of the contact surface. .

  FIG. 10 shows the unlocked state, and the lock slider 53 at this time is in contact with the second inclined surface 45 h provided on the outer periphery of the lock ring 45 in a biased state. Therefore, contrary to the locked state, the lock ring 45 is urged clockwise. In other words, the urging force is always applied to the lock end side in the locked state and to the unlock end side in the unlocked state. It is configured to return to.

  Further, as described above, during the transition between the locked state and the unlocked state, the inside of the photo interrupter 46a is shielded by the light shielding portion 45k of the lock ring 45. If the lock ring 45 stops in that state due to disturbance or the like. Control is performed so that the previous drive is performed again. If the end is not detected even after re-driving, an error signal is transmitted to the camera side and control is performed to notify the failure.

  Note that the lock end and the unlock end are the same signal (in a state where light is not shielded), but at the same time when viewed simultaneously with the position detection signal of the shift system, it can be determined whether the lock state or the unlock state is in effect. Is possible.

  In other words, it can be determined that the position signal is substantially in the vicinity of the center in the state where the end signal is output, and that the lock system is in the locked state.

  In addition, if it is not possible to distinguish between the locked state and the unlocked state from the viewpoint of preventing a problem, the control may be performed to re-drive to the locked state.

  7 is a cross-sectional view in which the hook portion 37a of the shift spring 37 in FIG. 4 is cut by a surface (C-C surface) that is hooked on the columnar protrusion 31b of the support frame 31 and the columnar protrusion 30c of the base plate 30. .

  The support frame (shake correction unit) 31 performs image shake correction by freely moving in the plane orthogonal to the optical axis. However, as described above, in the present embodiment, the support 31 is supported by the three rolling balls 38 disposed on the first yoke 32 and is pressed against the rolling ball 38 by the three shift springs 37. Position restriction in the optical axis direction is performed.

  Therefore, there is the following influence when the shake correction area is near the shake correction end. Specifically, if the protrusion 30c on the base plate 30 and the protrusion 31b on the support frame 31 on which the hook 37a of the shift spring 37 is hooked are simply cylindrical, depending on the moving direction of the support frame 31, a cylindrical cylinder It becomes easy to slip in the axial direction. In addition, even when it swings on the cross section of FIG. 7, the hook portion 37a of the shift spring 37 slides on the circumferential surface of the cylinder.

  In this case, load fluctuations occur when the shake correction unit 31 moves, and for example, a stick-slip movement is likely to occur. Therefore, it becomes a variation factor in the control of shake correction driving, and the control becomes unstable. In addition, the shift spring 37 is repelled and noise is likely to occur.

Therefore, in this embodiment, the shape of a portion of the protrusion (holding portion) 30c (31b) on which the hook portion 37a of the shift spring 37 is hung is deformed from a cylindrical shape.

  FIGS. 11 and 12A are schematic views of the main part of the protrusion 30c (31b) of this embodiment. FIG. 11 shows a cross-sectional shape of the protrusion 30 c provided on the base plate 30. FIG. 12A shows a state when viewed from the lateral direction. 12B is a perspective view of a main part of FIG. 12A, and FIG. 12C is a perspective view of the state cut along the cross section of FIG.

Specifically, in FIG. 11, the hatched portion is a region excluding the recessed portion in which a part of the cylinder is cut in the cylinder cross section, and the hatched portion has a projection 30 c-1 as a small diameter portion and projections 30 c-1 on both sides thereof. A protrusion 30c-2 having a lower height is formed. The protrusion 30c-1 is formed with a diameter φPa that is not more than half of the diameter φP on the inner side (in the recess) than the diameter φP of the column of the original protrusion 30c. When the hook portion 37a of the shift spring 37 is hooked on the protrusion 30c-1, the protrusion 30c-2 does not abut (contact) even if the support frame 31 shifts the maximum amount.

  As a result, when the shift spring 37 shifts in this plane, it abuts at a point at the projection 30c-1, and therefore tilts (rotates) around the projection 30c-1. Therefore, as compared with the case where the entire cylinder is subjected to friction, friction is less likely to occur, and the load fluctuation is less likely to occur due to the point hit.

  In this way, the shift spring 37 is held so as to be rotatable around the holding portion 30c during image blur correction.

  In FIGS. 12A and 12B, the shape of the protrusion 30c-1 is formed in an arc shape in the axial direction so as to be spotted in the axial direction of the protrusion 30c. It is held rotatably around the holding portion (30c-1) at the time of image blur correction. The protrusion 30c-2 is configured not to contact the hooking portion 37a of the shift spring 37 even in this direction.

  In the above shape, the columnar protrusion 31b formed on the support frame 31 is also formed in the same shape.

  As described above, the lens barrel provided with the image stabilization mechanism of the present embodiment has the shake detection means including the position detection element 40b that detects the vibration generated in the lens barrel, the IRED 36, and the like.

  And a shake correction unit 31 that holds an image shake correction lens L5 that moves to have a component orthogonal to the optical axis of the lens barrel based on a signal from the shake detection unit and corrects the image shake. Yes.

  The ground plane 30 movably holds shake correction means 31 that holds the correction lens L5.

  The positions of the base plate 30 and the shake correction means 31 in the optical axis direction are restricted by three (a plurality of) rolling balls 38 arranged uniformly or substantially uniformly around the optical axis.

  At this time, a tension spring (elastic means) 37 is arranged between the ground plate 30 and the shake correction means 31 so that the rolling ball 38 rolls, and both are held in an urged state.

The shake correction means 31 and the base plate 30 have holding portions 31b and 30c , respectively, and a hook portion 37a of a tension spring 37 is hooked on the holding portions 31b and 30c . The holding portions 31b and 30c have a columnar shape, for example, a columnar shape or a prismatic shape.

When the shake correction means 31 moves to correct the image shake in this hooked state, the tension spring 37 moves one of the two holding portions 31b and 30c , that is, the holding portion 30c in this embodiment. It is configured to be displaceable in the center, for example, to be rotatable.

As described above, in this embodiment, the shake correcting means 31 is provided with three rolling balls 38 that are arranged uniformly or substantially uniformly in the optical axis direction and the rotation direction,
The rolling ball 38 is held in a state of being biased by the tension spring 37 between the ground plate 30 and the shake correction means 31 so that the rolling ball 38 rolls.

  At this time, the shape of the holding portions 31b and 30c of the tension spring 37 on the shake correction means 31 side and the base plate 30 side is configured so that the tension spring is held displaceably at the time of shake correction around the holding portion. This reduces the influence of friction and slippage at the holding portion of the tension spring.

  The holding portions 31b and 30c of the tension spring 37 have a substantially cylindrical shape, and a part of the cylindrical shape is a small diameter portion 30c-1 having a diameter smaller than the diameter of the column cross section, and the tension spring 37 is held inside the column cross section diameter. doing.

  In this manner, the tension spring 37 is held so as to be displaceable at the time of shake correction around the small diameter portion 30c-1. As a result, the tension spring 37 is prevented from being detached and the tension spring 37 is point-held, so that the influence of friction and slippage between the tension spring 37 and its holding portion is reduced.

  In this embodiment, at least one of the two holding portions 31b and 30c is formed in a columnar shape, and the tension spring 37 is displaced in one holding portion in the axial direction of the column shape and in a direction perpendicular to the axial direction. It is possible to stop.

  As a result, the influence of friction and slippage between the tension spring 37 and its holding portion is reduced.

  In particular, since the tension spring is point-held while preventing the tension spring from being removed regardless of the direction of shake correction, the influence of friction and slip between the tension spring and its holding portion can be reduced. .

  FIG. 14 is a schematic diagram of a main part of the protrusion 30c according to the second embodiment of the present invention.

  Only the cross-sectional shape of the hook 37a of the shift spring 37 is different from the first embodiment.

The cross-sectional shape (cylindrical shape) is a fan shape in which an edge portion 30c-5 is formed as shown in FIG. 14, and the hook portion 37a of the shift spring 37 is held by this edge portion (vertical angle) 30c-5. Yes. Accordingly, when the support frame 31 is moved by the shake correction drive, the shift spring 37 rotates in the R direction in the drawing around the edge portion 30c-5. By comprising in this way, there is little influence of the friction in this holding | maintenance part 30c-5, and generation | occurrence | production of a slip.

  This edge portion is formed with a finite width in the axial direction.

  In the above shape, the columnar protrusion 31b of the support frame 31 is also formed in the same shape.

  As described above, the influence on the shake correction control can be eliminated, and the generation of sound can be suppressed during the shake correction control.

  Note that the control of the shake correction apparatus is the same as that disclosed in, for example, Japanese Patent Application Laid-Open No. 9-61881 and is omitted in this case.

  As described above, in each embodiment, the locking means of the shake correction device is constituted by a lock ring, a lock coil, a lock magnet, a lock spring, and a lock slider. For this reason, there is no power consumption when holding in the locked state and unlocked state. In addition, since it is a mechanical urging means, the structure is easy and compact, and the contact part is made of elastic rubber, which is an elastic member, and the lock slider is made of slippery resin, so that abnormal noise is generated. Nor.

  The lock spring and the lock slider are arranged at three places, but the same effect can be obtained at one place. The same effect can be obtained by using another elastic member such as rubber or a leaf spring instead of the lock spring.

Sectional drawing of the lens barrel of Example 1 of the present invention 1 is an exploded perspective view of the shake correction apparatus in FIG. FIG. 2 is an exploded perspective view of the left and right sides reversed. The front view seen from the locking means side of the shake correction apparatus in FIG. AA sectional view of FIG. BB cross section of Fig. 4 CC sectional view of FIG. A diagram showing when the lock ring is assembled in this embodiment The figure showing the lock state of the lock ring in a present Example The figure showing the unlocking state of the lock ring in a present Example 7 is an enlarged cross-sectional view of the shift spring projection 30c in FIG. Explanatory drawing of the protrusion 30c for shift springs in FIG. Conceptual diagram showing the image stabilization system in this embodiment Sectional drawing of the protrusion 30c for shift springs of the support frame showing Example 2 of this invention

Explanation of symbols

12: shake correction device 17: diaphragm unit 30: ground plane (supporting means)
30c: Holding portion 30c-1: Small diameter portion 30c-5: Edge portion 31: Support frame (shake correction means)
31b: holding part 37: shift spring 37a: hooking part 38: rolling ball 45: lock ring (rotating member, locking means)
49: Lock coil 52: Lock spring 53: Lock slider

Claims (5)

A lens barrel used in optical equipment,
Shake detecting means for detecting vibrations generated in the lens barrel;
A shake correction unit that holds an image shake correction lens that moves to have a component in a direction orthogonal to the optical axis of the lens barrel based on a signal from the shake detection unit;
Shake and the ground plane for movably holding the correction means,
Three rolling balls arranged uniformly or substantially uniformly around the optical axis for regulating the position of the shake correction means in the optical axis direction;
It is disposed between the該地plate and shake correcting means as said transfer motion ball rolls has a tension spring held in a state of being urged both, and
Each of the shake correction means and the ground plate has a holding portion that holds the hook portion of the tension spring, and when the shake correction means moves and corrects the image shake, the tension spring is moved by the two holding portions. At least one of the two holding portions is configured to be displaceable in the hooked state,
At least one of the two holding portions includes a columnar shape, and a part of the columnar shape has a small-diameter portion having a diameter smaller than the diameter of the columnar section inside the diameter of the columnar section, and The hook portion of the spring is hooked to the small diameter portion, and the tension spring is configured to be displaceable around the small diameter portion,
Further, when cut along a plane perpendicular to the extending direction of the cylindrical shape including the small diameter portion, protrusions are formed on both sides of the small diameter portion, and the tension spring is moved by the movement of the image blur correction lens. A lens barrel characterized in that the projection is not in contact with the tension spring even when the maximum amount is displaced around the small diameter portion. A lens barrel used in optical equipment,
Shake detecting means for detecting vibrations generated in the lens barrel;
A shake correction unit that holds an image shake correction lens that moves to have a component in a direction orthogonal to the optical axis of the lens barrel based on a signal from the shake detection unit;
Shake and the ground plane for movably holding the correction means,
Three rolling balls arranged uniformly or substantially uniformly around the optical axis for regulating the position of the shake correction means in the optical axis direction;
It is disposed between the該地plate and shake correcting means as said transfer motion ball rolls has a tension spring held in a state of being urged both, and
Each of the shake correction means and the ground plate has a holding portion that holds the hook portion of the tension spring, and when the shake correction means moves and corrects the image shake, the tension spring is moved by the two holding portions. At least one of the two holding portions is configured to be displaceable in the hooked state,
At least one of the two holding portions includes a columnar shape, and a diameter of a cross section of the columnar shape when cut by a plane perpendicular to the extending direction of the columnar shape in a recess provided in the columnar portion. A small diameter portion having a smaller diameter has a shape formed along the concave portion in the extending direction of the columnar shape,
The hook portion of the tension spring is hooked to the small diameter portion, and the tension spring is configured to be displaceable around the small diameter portion,
Further , even if the tension spring is displaced by a maximum amount around the small diameter portion due to the movement of the image blur correction lens, the tension spring is configured not to contact a portion other than the small diameter portion. Lens barrel to be used. When cut along a plane perpendicular to the extending direction of the columnar shape including the small-diameter portion, a protrusion is formed in the concave portion, and the protrusion is displaced by the maximum amount around the small-diameter portion. The lens barrel according to claim 2, wherein the tension spring is configured not to contact the protrusion . The lens barrel according to claim 2, wherein an edge portion is formed in the small diameter portion, and a hook portion of the tension spring is hooked on the edge portion.   An optical apparatus comprising the lens barrel according to any one of claims 1 to 4.