JP5424413B2 - Anti-vibration actuator, lens unit and camera equipped with the same - Google Patents

Description

  The present invention relates to an anti-vibration actuator, and more particularly, to an anti-vibration actuator disposed inside a lens barrel for moving an image blur prevention lens, a lens unit including the same, and a camera.

  Japanese Patent Laid-Open No. 2002-287196 (Patent Document 1) describes a blur correction optical device. The blur correction optical device includes a base member disposed in the lens barrel, a correction lens that is movably mounted on the base member, and a driving unit that drives the correction lens attached to the base member. Yes. When the correction lens is driven with respect to the base member by the driving means in order to correct the blur, the reaction force that has driven the correction lens acts on the base member. This reaction force causes the base member to vibrate, and when this vibration is transmitted to the lens barrel, the lens barrel is also vibrated, causing abnormal noise and the like.

  In the shake correction optical apparatus described in Japanese Patent Application Laid-Open No. 2002-287196, the base member is attached to the lens barrel through a flexible member such as maltoprene (rubber sponge), and vibration is transmitted from the base to the lens barrel. Is suppressed.

JP 2002-287196 A

  However, since the flexible member is easily deformed when the base member is attached to the lens barrel portion via the flexible member as in the shake correction optical device described in Japanese Patent Laid-Open No. 2002-287196, the basic member is There is a problem that it is difficult to mount with high positioning accuracy. When the positioning accuracy of the base member is lowered, the positioning accuracy of the correction lens supported by the foundation member is also lowered, so that the quality of the image formed through the correction lens is lowered.

  Further, since the elasticity and flexibility of the flexible member change with the passage of time, there is a problem that it is difficult to maintain the initial performance over a long period of time. For this reason, there exists a possibility that an image quality may fall by the secular change of a flexible member.

  Accordingly, the present invention provides an anti-vibration actuator that can be accurately positioned in the lens barrel while suppressing the occurrence of abnormal noise caused by driving the image blur prevention lens, and a lens unit including the same. The aim is to provide a camera.

  In order to solve the above-described problems, the present invention provides a vibration-proof actuator disposed inside a lens barrel for moving an image-shake prevention lens, and includes an actuator fixing portion and an image-shake prevention lens. The actuator movable part to which the actuator is attached, the actuator movable part support means for movably supporting the actuator movable part with respect to the actuator fixed part, and a driving force is applied between the actuator fixed part and the actuator movable part to Driving means for driving the actuator movable portion with respect to the fixed portion, and point contact by being pressed in the optical axis direction of the lens barrel against the first actuator receiving surface provided in the actuator fixed portion and provided in the lens barrel Or a plurality of first supporting convex portions that are in line contact with each other and the actuator fixing portion, A plurality of second support convex portions that are point-contacted or line-contacted by being pressed in the optical axis direction of the lens barrel on the second actuator receiving surface disposed to face the actuator receiving surface. It is characterized by.

  In the present invention configured as described above, the actuator movable portion to which the image blur prevention lens is attached is supported by the actuator movable portion supporting means so as to be movable with respect to the actuator fixing portion. The driving means drives the actuator movable portion by applying a driving force between the actuator fixing portion and the actuator movable portion. The first supporting convex portion provided on the actuator fixing portion is pressed against the first actuator receiving surface in the optical axis direction, and is in point contact or line contact with the first actuator receiving surface. The second support convex portion provided on the actuator fixing portion is pressed in the direction of the optical axis against the second actuator receiving surface disposed so as to face the first actuator receiving surface, and makes point contact with the second actuator receiving surface. Or they are in line contact.

  According to the present invention configured as described above, the reaction force acting on the actuator fixing portion by driving the actuator movable portion excites vibration in the actuator fixing portion. Since point contact or line contact is made on each actuator receiving surface via the supporting convex portion, transmission of this vibration to each actuator receiving surface is suppressed. Accordingly, it is possible to accurately position the vibration isolating actuator within the lens barrel, and to suppress the occurrence of abnormal noise caused by driving the image blur preventing lens.

  In the present invention, it is preferable that the point is further provided by pressing in a radial direction of a circle centered on the optical axis of the lens barrel, on the third actuator receiving surface provided in the actuator fixing portion and provided in the lens barrel. A plurality of third supporting protrusions that are in contact or line contact are provided.

  According to the present invention configured as described above, the third supporting convex portion is brought into point contact or line contact by being pressed against the third actuator receiving surface in the radial direction, so that it is orthogonal to the optical axis of the vibration isolation actuator. It is possible to suppress the vibration of the actuator fixing portion from being transmitted to the lens barrel while enabling positioning within the surface to be performed.

  In the present invention, preferably, it further has a yoke attached to the lens barrel, and the drive means is a drive magnet attached to either the actuator movable portion or the actuator fixing portion, and the actuator movable portion or the actuator. A drive coil attached to the other of the fixed parts, and the first support convex part or the second support convex part is formed by the first actuator receiving surface or the first support part by an attractive force between the drive magnet and the yoke. 2 Pressed against the actuator receiving surface.

  According to the present invention configured as described above, the supporting convex portion is pressed against the actuator receiving surface by the attraction force between the driving magnet and the yoke, so that the supporting convex portion can be moved to the actuator receiving surface with a more even force. Can be pressed against.

  The present invention also provides a lens unit including a vibration-proof actuator that moves an image-blur prevention lens, a lens barrel, an imaging lens disposed inside the lens barrel, an actuator fixing portion, , An actuator movable part to which an image blur prevention lens is attached, an actuator movable part support means for movably supporting the actuator movable part with respect to the actuator fixed part, and a drive between the actuator fixed part and the actuator movable part. A driving means for applying a force to drive the actuator movable portion with respect to the actuator fixing portion, a first actuator receiving surface provided in the lens barrel, and a second actuator disposed so as to face the first actuator receiving surface On the actuator receiving surface and either the actuator fixing part or the first actuator receiving surface And a plurality of first supporting convex portions that are point-contacted or line-contacted with the other of the actuator fixing portion or the first actuator receiving surface by being pressed in the optical axis direction of the lens barrel, and the actuator fixing portion or the first A plurality of second support members that are provided on any one of the two actuator receiving surfaces and are point-contacted or line-contacted with the other of the actuator fixing portion or the second actuator receiving surface by being pressed in the optical axis direction of the lens barrel. And a convex portion.

  In the lens unit of the present invention, it is preferable that either one of the actuator fixing portion and the first actuator receiving surface is formed with a receiving concave portion that receives the first supporting convex portion.

  In the present invention configured as described above, since the first supporting convex portion is received by the receiving concave portion, positioning in a plane orthogonal to the optical axis can be performed by the pressing force in the optical axis direction.

  According to another aspect of the present invention, there is provided a camera including an anti-vibration actuator, comprising a camera body and the lens unit of the present invention.

  According to the vibration-proof actuator of the present invention, and the lens unit and camera including the same, positioning in the lens barrel can be performed accurately while suppressing the generation of abnormal noise caused by driving the image-shake prevention lens. Can do.

It is sectional drawing of the camera by embodiment of this invention. It is side surface sectional drawing which expands and shows the part to which the vibration proof actuator of the lens unit by embodiment of this invention was attached. It is a rear view which shows the state which removed the movable part of the vibration proof actuator by embodiment of this invention. It is a front view of the movable part of the vibration proof actuator by embodiment of this invention. It is a disassembled perspective view of the vibration proof actuator by embodiment of this invention. It is sectional drawing which shows the modification of the vibration proof actuator by embodiment of this invention.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
First, a camera according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a cross-sectional view of a camera according to an embodiment of the present invention.
As shown in FIG. 1, a camera 1 according to an embodiment of the present invention includes a lens unit 2 and a camera body 4. The lens unit 2 includes a lens barrel 6, a plurality of imaging lenses 8 disposed in the lens barrel, an image stabilization actuator 10 that moves the image blur prevention lens 16 within a predetermined plane, and a lens. And a gyro 34 which is a vibration detecting means for detecting the vibration of the lens barrel 6.

  In the camera 1 according to the embodiment of the present invention, the vibration is detected by the gyro 34, the image stabilization actuator 10 is operated based on the detected vibration to move the image stabilization lens 16, and the film surface in the camera body 4 is moved. The image focused on F is stabilized. In the present embodiment, a piezoelectric vibration gyro is used as the gyro 34. In the present embodiment, the image blur prevention lens 16 is constituted by a single lens, but the lens for stabilizing the image may be a plurality of lens groups. In this specification, the image blur prevention lens includes one lens and a lens group for stabilizing an image.

The lens unit 2 is attached to the camera body 4 and configured to form incident light on the film surface F.
The generally cylindrical lens barrel 6 holds a plurality of imaging lenses 8 therein, and allows focus adjustment by moving some imaging lenses 8.

  Next, the vibration-proof actuator 10 will be described with reference to FIGS. FIG. 2 is an enlarged side cross-sectional view of a portion of the lens unit 2 to which the anti-vibration actuator 10 is attached. FIG. 3 is a rear view showing a state in which the movable part of the vibration isolation actuator 10 is removed, and FIG. 4 is a front view of the movable part of the vibration isolation actuator 10. FIG. 5 is an exploded perspective view of the vibration-proof actuator 10. 2 is a cross-sectional view showing a state in which the vibration-proof actuator 10 is broken along the line II-II in FIG.

  As shown in FIGS. 2 to 5, the anti-vibration actuator 10 is supported by a fixed plate 12, which is an actuator fixing portion fixed in the lens barrel 6, and can be translated and rotated with respect to the fixed plate 12. The movable frame 14 which is the movable actuator part and three steel balls 18 which are actuator movable part support means for supporting the movable frame 14 are provided. Further, the vibration isolating actuator 10 includes a first driving coil 20a, a second driving coil 20b, and a third driving coil 20c attached to the moving frame 14, and the driving coils 20a and 20b of the fixed plate 12. , 20c, and the first driving magnet 22a, the second driving magnet 22b, and the third driving magnet 22c, which are attached to the positions corresponding to the respective driving coils 20a, 20b, and 20c. It has the 1st magnetic sensor 24a which is a 1st, 2nd, 3rd position detection element, the 2nd magnetic sensor 24b, and the 3rd magnetic sensor 24c.

  Further, the vibration-proof actuator 10 uses the magnetic force of each driving magnet and the suction yoke 26 attached to the back side of the moving frame 14 to attract the moving frame 14 to the fixed plate 12 by the magnetic force of each driving magnet. And a back yoke 28 attached to the opposite surface of each drive magnet so as to be effectively directed toward the moving frame 14. The first driving coil 20a, the second driving coil 20b, the third driving coil 20c, and the first driving magnet 22a, the second driving magnet 22b, and the third driving coil, which are respectively attached to the corresponding positions. The drive magnet 22c constitutes first, second, and third drive means for driving the moving frame 14 with respect to the fixed plate 12, respectively.

  Further, as shown in FIG. 1, the vibration isolation actuator 10 detects vibration detected by the gyro 34 and positional information of the moving frame 14 detected by the first, second, and third magnetic sensors 24 a, 24 b, and 24 c. Based on the controller 36, the controller 36 is a control unit that controls the current flowing through the first, second, and third drive coils 20a, 20b, and 20c.

  The anti-vibration actuator 10 translates the moving frame 14 in a plane parallel to the film surface F with respect to the fixed plate 12 fixed to the lens barrel 6, thereby preventing image blur attached to the moving frame 14. Even if the lens 16 is moved and the lens barrel 6 vibrates, it is driven so that the image formed on the film surface F is not disturbed.

  The moving frame 14 has a generally donut plate shape, and an image blur prevention lens 16 is attached to the central opening. In addition, first, second, and third drive coils 20 a, 20 b, and 20 c are disposed on the moving frame 14. As shown in FIG. 3, the centers of these three driving coils are respectively arranged on the circumference of a circle centered on the optical axis of the lens unit 2. In the present embodiment, the second drive coil 20b is disposed vertically below the optical axis, and the first drive coil 20a, the second drive coil 20, and the drive coil 20c are equally spaced at a central angle of about 120.゜ spaced apart.

  The first, second, and third drive coils 20a, 20b, and 20c are wound in a generally rectangular shape with rounded corners, and one of the center lines is centered on the optical axis. It is arranged toward the tangential direction of the circumference.

  The fixed plate 12 includes a disk portion 12a having a generally donut plate shape and a side wall portion 12b formed on the outer periphery of the disk portion 12a (FIG. 5). The moving frame 14 is disposed in parallel to the disk portion 12a of the fixed plate 12, and is disposed inside the side wall portion 12b. In addition, the first, second, and third driving magnets 22a, 22b, and 22c are located at positions on the disk portion 12a that correspond to the first, second, and third driving coils 20a, 20b, and 20c. Are arranged respectively. The first, second, and third driving magnets 22a, 22b, and 22c are substantially rectangular, and the center line that crosses the long sides of the first, second, and third driving magnets 22a, 22b, and 22c is directed in the radial direction of a circle centered on the optical axis of the lens unit 2. Are arranged to be. The first, second, and third driving magnets 22a, 22b, and 22c are magnetized so that the center line that crosses the long side becomes the magnetization boundary line.

  As shown in FIGS. 2 and 3, the three steel balls 18 are sandwiched between the fixed frame 12 and the moving frame 14 and each have a central angle of 120 ° on the circumference of a circle centered on the optical axis A. They are arranged at intervals. The fixed frame 12 has a recess 30 at a position corresponding to each steel ball 18. Further, the moving frame 14 is formed with a recess 31 at a position corresponding to each steel ball 18. Each steel ball 18 is arrange | positioned in these recessed parts 30 and 31, and omission is prevented. As will be described later, since the moving frame 14 is attracted to the fixed plate 12 by the driving magnet, each steel ball 18 is sandwiched between the fixed plate 12 and the moving frame 14. As a result, the moving frame 14 is supported on a plane parallel to the fixed plate 12, and each steel ball 18 is rolled while being held, so that translational movement and rotational movement of the moving frame 14 with respect to the fixed plate 12 are allowed. Is done.

  The back yoke 28 has a generally donut plate shape, and is disposed on the side opposite to the moving frame 14 with respect to the fixed plate 12. By this back yoke 28, the magnetic flux of each driving magnet is efficiently directed toward the moving frame 14.

  The suction yoke 26 has a generally donut plate shape, and is attached to the surface of the moving frame 14 opposite to the drive coil. The moving frame 14 is attracted to the fixed plate 12 by the magnetic force exerted by each driving magnet on the attracting yoke 26.

  The first, second, and third driving magnets 22a, 22b, and 22c apply magnetism to the rectangular first and second third driving coils 20a, 20b, and 20c. Thus, when a current flows through each driving coil, a circumferential driving force is generated between each corresponding driving magnet.

  As shown in FIGS. 2 and 3, a first magnetic sensor 24a, a second magnetic sensor 24b, and a third magnetic sensor 24c are arranged inside each driving coil, respectively. It is configured to measure directional displacement. Based on the signals detected by the first, second, and third magnetic sensors 24a, 24b, and 24c, the position where the moving frame 14 is translated and rotated with respect to the fixed frame 12 can be specified. In the present embodiment, a Hall element is used as the magnetic sensor.

Next, with reference to FIG. 2 and FIG. 5, a fixing structure of the vibration isolation actuator 10 will be described.
As shown in FIGS. 2 and 5, the vibration isolation actuator 10 is fixed by being sandwiched between a first actuator fixing member 40 and a second actuator fixing member 42. The first actuator fixing member 40 and the second actuator fixing member 42 are fixed by three screws 43. By tightening these screws 43, the second actuator fixing member 42 is attracted to the first actuator fixing member 40, and these The vibration-proof actuator 10 is sandwiched between the two. As shown in FIG. 2, the back yoke 28 is attached to the surface of the first actuator fixing member 40 that faces the fixing frame 12. For this reason, the fixed frame 12 is also fixed to the first actuator by the attraction force acting between the first, second, and third drive magnets 22a, 22b, and 22c attached to the fixed frame 12 and the back yoke 28. Pressed against the member 40.

  The first actuator fixing member 40 includes a donut plate-like disk portion 40a and a side wall portion 40b formed so as to surround the outer periphery thereof, and the vibration isolation actuator 10 is disposed inside the side wall portion 40b. . Further, although the first actuator fixing member 40 is illustrated as an independent member in FIG. 5, in the present embodiment, as illustrated in FIG. 4, the first actuator fixing member 40 is formed integrally with the inner wall surface of the lens barrel 6. It is a member. As a modification, the first actuator fixing member 40 may be formed as a separate component from the lens barrel 6 and fixed to the lens barrel 6 by screwing or bonding.

  The second actuator fixing member 42 includes a donut plate-like disk portion 42a and a side wall portion 42b formed so as to surround the outer periphery thereof, and the vibration isolation actuator 10 is disposed inside the side wall portion 42b. . That is, the first actuator fixing member 40 and the second actuator fixing member 42 are arranged so that the side wall portion 40b and the side wall portion 42b face each other, and the vibration-proof actuator 10 is sandwiched between them.

  As shown in FIG. 5, the fixing plate 12 includes three first support convex portions 44 (only one is shown in FIG. 2), and these first support convex portions 44 are fixed to the first actuator. It is formed on the surface facing the member 40. These first supporting convex portions 44 are convex portions formed at equal intervals around the central opening of the disk portion 12a of the fixed plate 12, and their tips are formed in a hemispherical shape. The tips of the first support convex portions 44 are in contact with the disk portion 40 a of the first actuator fixing member 40. That is, the tip of the first support convex portion 44 is brought into contact with the first actuator receiving surface 46 which is the surface of the disc portion 40a facing the fixed plate 12. Since the tip of the first support convex portion 44 is formed in a hemispherical shape, the tip of the first support convex portion 44 is provided in the lens barrel 6 by being pressed in the optical axis direction of the lens barrel 6. The first actuator receiving surface 46 is brought into point contact.

  The fixing plate 12 is accurately positioned with respect to the first actuator fixing member 40 when each first supporting convex portion 44 is brought into contact with the first actuator receiving surface 46. In addition, since the tips of the first support convex portions 44 are in point contact with the first actuator receiving surface 46, transmission of vibration from the fixing plate 12 to the first actuator fixing member 40 is suppressed. Further, the back yoke 28 is disposed between the fixing plate 12 and the first actuator fixing member 40, but as shown in FIG. 2, each first support convex portion 44 is provided on the back yoke 28. The first actuator receiving member 46 is brought into contact with the first actuator receiving surface 46 through the notch 28a. Alternatively, each first support convex portion 44 may be configured to contact the back yoke 28 without providing the notch 28a.

  In the present specification, the “first actuator receiving surface 46 provided on the lens barrel 6” means that the first actuator fixing member 40 is integrated with the lens barrel 6 and the first actuator fixing member 40. It is assumed that the lens barrel 6 is a separate body. Further, in this specification, “point contact” means that the supporting convex portion and the receiving surface come into contact with each other in a narrow spot-like region.

  On the other hand, as shown in FIG. 5, the fixing plate 12 includes three second supporting convex portions 48, and these second supporting convex portions 48 are formed on the side facing the second actuator fixing member 42. (Only one is shown in FIGS. 2 and 5). These second supporting convex portions 48 are convex portions formed at equal intervals toward the second actuator fixing member 42 at the front end of the side wall portion 12b of the fixing plate 12, and the front ends thereof are formed in a hemispherical shape. Has been. The tips of the second support convex portions 48 are in contact with the disk portion 42 a of the second actuator fixing member 42. That is, the tip of the second support convex portion 48 is brought into contact with the second actuator receiving surface 50 which is the surface of the disk portion 42a facing the fixed plate 12. Since the tip of the second support convex portion 48 is formed in a hemispherical shape, the tip of the second support convex portion 48 is pressed in the optical axis direction of the lens barrel 6, thereby causing the second actuator receiving surface 50. And point contact. The fixing plate 12 is accurately positioned by bringing the second support convex portions 48 into contact with the second actuator receiving surface 50. Therefore, the fixing plate 12 is sandwiched between the first actuator receiving surface 46 of the first actuator fixing member 40 and the second actuator receiving surface 50 of the second actuator fixing member 42 disposed so as to face the first actuator receiving surface 46. The In addition, since the tips of the second support convex portions 48 are in point contact with the second actuator receiving surface 50, transmission of vibration from the fixed plate 12 to the second actuator fixing member 42 is suppressed.

  Further, three third supporting convex portions 52 are formed outside the side wall portion 12b of the fixing plate 12 (one is shown in FIG. 2 and only two are shown in FIG. 5). These third supporting convex portions 52 are convex portions formed at equal intervals on the outer periphery of the side wall portion 12b of the fixed plate 12, and are each formed in a semi-cylindrical shape. When the fixing plate 12 is fitted inside the side wall portion 40b of the first actuator fixing member 40, the top of each third supporting convex portion 52 is placed on the third actuator receiving surface 54 which is the inner side surface of the side wall portion 40b. Is pressed in the radial direction of the circle centered at. Since each third supporting convex portion 52 is formed in a semi-cylindrical shape, the third supporting convex portion 52 is in line contact with the third actuator receiving surface 54. The fixing plate 12 is accurately positioned with respect to the first actuator fixing member 40 by bringing the third supporting convex portions 52 into contact with the third actuator receiving surface 54. In addition, since the tip of each third supporting convex portion 52 is in line contact with the third actuator receiving surface 54, transmission of vibration from the fixed plate 12 to the first actuator fixing member 40 is suppressed. In this specification, “line contact” means that the supporting convex portion and the receiving surface are in contact with each other in a linear narrow region.

Next, control of the vibration isolation actuator 10 will be described.
The vibration of the lens unit 2 is detected momentarily by the gyro 34 and input to the controller 36. An arithmetic circuit (not shown) built in the controller 36 generates a lens position command signal for commanding in time series the position to which the image blur prevention lens 16 should be moved based on the angular velocity input from the gyro 34 every moment. Generate. Even if the lens unit 2 vibrates during the exposure of photography by moving the image blur prevention lens 16 momentarily according to the lens position command signal thus obtained, the film surface in the camera body 4 The image focused on F is stabilized without being disturbed.

  The controller 36 includes first, second, and third drive coils so that the image blur prevention lens 16 is moved to a position instructed by a lens position command signal generated by an arithmetic circuit (not shown). The current flowing through 20a, 20b, and 20c is controlled.

  The controller 36 causes each drive coil 20 to pass a current proportional to the difference between the movement amount of each drive coil with respect to each drive magnet and the lens position command signal measured by each magnetic sensor. Therefore, when there is no difference between the lens position commanded by the lens position command signal and the position detected by each magnetic sensor, no current flows through each driving coil, and the driving force acting on each driving coil becomes zero. Become.

  Next, the operation of the camera 1 according to the embodiment of the present invention will be described with reference to FIG. First, by turning on a start switch (not shown) for the camera shake prevention function of the camera 1, the vibration isolation actuator 10 provided in the lens unit 2 is operated. The gyro 34 attached to the lens unit 2 detects vibration in a predetermined frequency band every moment and outputs it to an arithmetic circuit (not shown) built in the controller 36. The gyro 34 outputs an angular velocity signal to the arithmetic circuit, and the arithmetic circuit integrates the input angular velocity signal with time to calculate a deflection angle, and adds a predetermined correction signal to this to generate a lens position command signal. To do. By moving the image blur prevention lens 16 momentarily to the position commanded by the lens position command signal output in time series by the arithmetic circuit, the image focused on the film surface F of the camera body 4 is stabilized. Is done.

  The controller 36 causes a current corresponding to the difference between the detection signal of each magnetic sensor and the lens position command signal in each direction to flow through each driving coil. When a current flows through each driving coil, a magnetic field proportional to the current is generated. Due to this magnetic field, the first, second, and third driving coils 20a, 20b, and 20c arranged corresponding to the first, second, and third driving magnets 22a, 22b, and 22c receive the driving force and move. The frame 14 is moved. When the moving frame 14 is moved by the driving force and each driving coil reaches the position specified by the lens position command signal, the driving force becomes zero. Further, when the moving frame 14 moves out of the position specified by the lens position command signal due to a disturbance or a change in the lens position command signal, a current is again supplied to each driving coil, and the moving frame 14 Returns to the position specified by the signal.

  By repeating the above operation every moment, the image blur prevention lens 16 attached to the moving frame 14 is moved so as to follow the lens position command signal. Thereby, the image focused on the film surface F of the camera body 4 is stabilized.

  When the moving frame 14 is driven with respect to the fixed plate 12, a reaction force of the driving force with respect to the moving frame 14 acts on the fixed plate 12. This reaction force excites vibrations in various directions on the fixed plate 12, and the fixed plate 12 has a first support convex portion 44 and a second support against the first actuator fixing member 40 and the second actuator fixing member 42. 2 Positioned via the support convex portion 48 and the third support convex portion 52 and supported by point contact or line contact, transmission of vibration from the fixing plate 12 to the first and second actuator fixing members Is suppressed. Thereby, generation | occurrence | production of the abnormal noise etc. by driving the moving frame 14 is suppressed.

  According to the vibration isolating actuator 10 of the embodiment of the present invention, the reaction force that acts on the fixed plate 12 by driving the moving frame 14 excites vibrations on the fixed plate 12. Since the first and second actuator receiving surfaces 46 and 50 are point-contacted via the second supporting convex portions 44 and 48, transmission of this vibration to each actuator receiving surface is suppressed. Accordingly, it is possible to accurately position the vibration isolating actuator 10 in the lens barrel 6 and to suppress the occurrence of abnormal noise or the like caused by driving the image blur preventing lens 16.

  According to the vibration isolating actuator 10 of the present embodiment, the third supporting convex portion 52 is brought into line contact by being pressed against the third actuator receiving surface 54 in the radial direction, and thus is orthogonal to the optical axis of the vibration isolating actuator 10. It is possible to suppress the vibration of the actuator fixing portion 10 from being transmitted to the lens barrel 6 while enabling positioning within the surface to be performed.

  According to the vibration-proof actuator 10 of the present embodiment, the first support convex portion 44 is formed by the attraction force between the three drive magnets 22a, 22b, 22c and the back yoke 28 arranged at equal intervals. Since it is pressed against the receiving surface 46, the first support convex portion 44 can be pressed against the first actuator receiving surface 46 with a more even force.

  As mentioned above, although preferable embodiment of this invention was described, a various change can be added to embodiment mentioned above. In particular, in the above-described embodiment, the present invention is applied to a film camera. However, the present invention can be applied to any camera for capturing a still image or a moving image, such as a digital camera or a video camera. The present invention can also be applied to a lens unit used with the camera body of these cameras.

  In the above-described embodiment, the first support convex portion 44 and the second support convex portion 48 are in point contact with the first actuator receiving surface 46 and the second actuator receiving surface 50, respectively. The first supporting convex portion and the second supporting convex portion can be formed so as to be in line contact with these receiving surfaces. Similarly, the third supporting convex portion 52 is in line contact with the third actuator receiving surface 54, but the third supporting convex portion may be formed so as to be in point contact with the third actuator receiving surface 54. it can. Further, although three each of the first, second, and third supporting convex portions are provided, four or more supporting convex portions can be provided.

  Further, in the above-described embodiment, the first support convex portion 44, the second support convex portion 48, and the third support convex portion 52 are provided on the fixed plate 12, respectively. The convex portion can be provided on the first actuator fixing member 40 and the second actuator fixing member 42 side.

  In the above-described embodiment, the first support convex portion 44 and the second support convex portion 48 are in contact with the flat actuator receiving surface, but as a modification, the actuator receiving surface is curved. Can also be configured. Preferably, the supporting convex portion formed in a hemispheric shape is received by a receiving concave portion having a concave surface having a larger radius of curvature than the supporting convex portion. By forming the actuator receiving surface in this way, the fixing plate 12 is placed in a plane perpendicular to the optical axis, that is, the radius of the circle centered on the optical axis, while the supporting convex portion and the actuator receiving surface are in point contact. It can also be positioned in the direction.

  Furthermore, in the above-described embodiment, a linear motor including a driving magnet and a driving coil is used as a driving unit. However, as a modification, an arbitrary driving unit such as a driving unit using a piezoelectric element is used. Can be used.

  In the above-described embodiment, each driving magnet is attached to the fixed plate 12 of the vibration-proof actuator 10, and each driving coil is attached to the moving frame 14, but as a modification, as shown in FIG. In addition, a driving magnet can be attached to the moving frame, and a driving coil can be attached to the fixed plate.

  In the modification shown in FIG. 6, three driving magnets 122 (only one is shown) are attached to a moving frame 114 to which an image blur prevention lens 116 is attached. On the other hand, three driving coils 120 (only one is shown) are attached to the fixed plate 112. Further, the fixing plate 112 is brought into point contact with the first actuator receiving surface of the first actuator fixing member 140 via three first supporting convex portions 144 (only one is shown), and three third supporting convex portions. Line contact is made with the third actuator receiving surface of the first actuator fixing member 140 via 152 (only one shown). Further, the fixing plate 112 is in point contact with the second actuator receiving surface of the second actuator fixing member 142 via three second supporting convex portions 148 (only two are shown).

DESCRIPTION OF SYMBOLS 1 Camera of embodiment of this invention 2 Lens unit 4 Camera main body 6 Lens barrel 8 Imaging lens 10 Anti-vibration actuator 12 Fixing plate (actuator fixing part)
12a Disk part 12b Side wall part 14 Moving frame (actuator movable part)
16 Image stabilization lens 18 Steel ball (actuator moving part support means)
20a First drive coil 20b Second drive coil 20c Third drive coil 22a First drive magnet 22b Second drive magnet 22c Third drive magnet 24a First magnetic sensor (first position detection element)
24b Second magnetic sensor (second position detecting element)
24c 3rd magnetic sensor (3rd position detection element)
26 Suction Yoke 28 Back Yoke 28a Notch 30 Recess 31 Recess 34 Gyro 36 Controller (Control Unit)
40 first actuator fixing member 40a disk part 40b side wall part 42 second actuator fixing member 42a disk part 42b side wall part 43 screw 44 first support convex part 46 first actuator receiving surface 48 second support convex part 50 second actuator Receiving surface 52 Third supporting convex portion 54 Third actuator receiving surface 112 Fixed plate 114 Moving frame 116 Lens for preventing image shake 120 Driving coil 122 Driving magnet 140 First actuator fixing member 142 Second actuator fixing member 144 First Supporting convex portion 148 Second supporting convex portion 152 Third supporting convex portion

Claims (6)

An anti-vibration actuator disposed inside the lens barrel for moving the image blur prevention lens,
An actuator fixing part,
An actuator movable part to which the image blur prevention lens is attached;
Actuator movable part support means for supporting the actuator movable part movably with respect to the actuator fixing part;
A driving means for applying a driving force between the actuator fixing portion and the actuator moving portion to drive the actuator moving portion with respect to the actuator fixing portion;
A plurality of first supporting protrusions that are provided in the actuator fixing portion and that are point-contacted or line-contacted by being pressed against the first actuator receiving surface provided in the lens barrel in the optical axis direction of the lens barrel. And
A plurality of points that are point-contacted or line-contacted by being pressed in the optical axis direction of the lens barrel against a second actuator receiving surface that is provided in the actuator fixing portion and is disposed so as to face the first actuator receiving surface. A second supporting convex portion of
An anti-vibration actuator comprising:   Furthermore, a point contact or a line contact is made by pressing against a third actuator receiving surface provided on the actuator fixing portion and provided on the lens barrel in a radial direction of a circle centering on the optical axis of the lens barrel. The vibration-proof actuator according to claim 1, further comprising a plurality of third supporting convex portions.   And a driving magnet attached to either the actuator moving part or the actuator fixing part; and the actuator moving part or the actuator fixing. A drive coil attached to the other of the first and second support projections, wherein the first support convex portion or the second support convex portion is formed by the attraction force between the drive magnet and the yoke. The vibration-proof actuator according to claim 1, wherein the vibration-proof actuator is pressed against the receiving surface or the second actuator receiving surface. A lens unit with a built-in anti-vibration actuator that moves the image blur prevention lens,
A lens barrel;
An imaging lens disposed inside the lens barrel;
An actuator fixing part,
An actuator movable part to which the image blur prevention lens is attached;
Actuator moving part support means for supporting the actuator moving part with respect to the actuator fixing part so as to be movable;
A driving means for applying a driving force between the actuator fixing portion and the actuator moving portion to drive the actuator moving portion with respect to the actuator fixing portion;
A first actuator receiving surface provided on the lens barrel;
A second actuator receiving surface arranged to face the first actuator receiving surface;
Provided on either the actuator fixing portion or the first actuator receiving surface and being pressed in the optical axis direction of the lens barrel, thereby making point contact with the other of the actuator fixing portion or the first actuator receiving surface. A plurality of first supporting convex portions that are in line contact;
It is provided on either the actuator fixing portion or the second actuator receiving surface, and is pressed in the optical axis direction of the lens barrel, thereby making point contact with the other of the actuator fixing portion or the second actuator receiving surface. A plurality of second supporting protrusions that are in line contact;
A lens unit comprising:   5. The lens unit according to claim 4, wherein a receiving concave portion for receiving the first supporting convex portion is formed on one of the actuator fixing portion and the first actuator receiving surface. A camera with an anti-vibration actuator,
The camera body,
The lens unit according to claim 4 or 5,
A camera characterized by comprising:

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