JP2012032430A - Lens barrel and optical apparatus including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel capable of effectively shielding harmful light passing gaps between a lens holding part and coils (or magnets), which are generated when the coils (or the magnets) are mounted on the lens holding part in a case where the lens holding part for holding correction lenses to correct an image blur is moved in a cross section vertical to an optical axis with respect to a fixing frame.SOLUTION: A lens barrel includes: a fixing part; a lens holding part which holds a correction lens group to correct an image blur and is supported by the fixing part; driving means that drives the lens holding part in a plane to be orthogonally crossed with an optical axis and in which one member constituting the driving means are fixed to the lens holding part with spaces when viewed from an optical axis direction and the other members constituting the driving means are fixed to the fixing part; and light shielding means where one surface is fixed to a light shielding means fixing part of the lens holding part and one end is brought into contact with a lens holding part side surface in the one member of the driving means, and which is arranged to clog gaps between the lens holding part and the one member of the driving means when viewed from the optical axis direction.

Description

  The present invention relates to a lens barrel having an image blur correction device that corrects image blur caused by vibration such as camera shake. In particular, the optical system is suitable for optical devices such as a video camera, a digital still camera, and a TV camera that correct image blur by driving a part of the optical system in a direction perpendicular to the optical axis direction.

  A camera having an image blur correction device for correcting an image blur generated when the camera vibrates in a lens barrel is known (Patent Document 1). In the image shake correction apparatus disclosed in Patent Document 1, camera shake is detected by a shake detection unit, and a lens holding frame that holds a correction lens for image shake correction is orthogonal to the optical axis according to the result. To drive. Since the lens holding frame moves in a plane orthogonal to the optical axis, a space is disposed between the lens holding frame and the fixed frame that holds the lens holding frame so as to be movable. If the light beam (harmful light beam) from the subject passes through the space outside the correction lens and enters the imaging surface, the imaging performance deteriorates.

  Therefore, in Patent Document 1, a light shielding member having an inner diameter smaller than the diameter of the lens holding frame is provided on the fixed frame. When the lens holding frame moves in a plane orthogonal to the optical axis, the harmful light beam passing through the space formed between the lens holding frame and the fixed frame is shielded, and the harmful light beam is transmitted to the imaging surface and the image shake correction mechanism. The incident is blocked.

Japanese Patent Laid-Open No. 06-003727

  In general, in an image shake correction apparatus in an optical apparatus such as a digital camera or a video camera, a coil and a magnet are used as driving means for moving a lens holding unit in a vertical section with respect to an optical axis with respect to a fixed frame (fixed cylinder). Is used. A coil is attached to one outer peripheral portion and a magnet is attached to the other outer peripheral portion so as to face the coil, thereby performing relative movement of both. Coils and magnets may have different external dimensions due to manufacturing errors. In particular, since the coil is composed of a wire wound with an electric wire, there is a large difference in external dimensions.

  Considering the error at this time, for example, when the coil is mounted on the lens holding part, when viewed from the optical axis direction, the lens holding part and the coil cannot be formed in close contact with each other, and a certain amount of gap It is attached with. For this reason, there is a case in which harmful light that enters from between the lens holding portion and the coil among the luminous flux from the subject and reaches the image plane to deteriorate the image quality may occur. The same applies to the case where a magnet is attached to the lens holding portion instead of the coil.

  The present invention relates to a lens barrel that moves a lens holding portion that holds a correction lens for correcting image blur within a cross section perpendicular to an optical axis with respect to a fixed frame.

  The present invention relates to a lens barrel capable of effectively blocking harmful light that passes through a gap between a lens holding portion and a coil (or magnet) generated when a coil (or magnet) is attached to the lens holding portion, and the lens barrel. It is an object to provide an optical apparatus having

  The lens barrel of the present invention includes a fixed portion, a lens holding portion that moves in a plane orthogonal to the optical axis, holds a correction lens group for image blur correction, is supported by the fixed portion, and the lens holding portion. The driving means for driving in the plane orthogonal to the optical axis and one member constituting the driving means are fixed to the lens holding portion with a gap when viewed from the optical axis direction, and the other members constituting the driving means are The lens holding unit is fixed to the fixing unit, and one surface is fixed to the light shielding unit fixing unit of the lens holding unit, and one end thereof is in contact with the surface of the driving unit on the lens holding unit side, thereby holding the lens And a light shielding means arranged so as to close a gap between the first member and one member of the driving means when viewed from the optical axis direction.

  According to the present invention, a lens barrel that can effectively block harmful light that passes through the gap between the lens holding portion and the coil (or magnet) generated when the coil (or magnet) is attached to the lens holding portion. Is obtained.

1 is a perspective view of a main part of the lens barrel 10 of the present invention. 1 is an exploded perspective view (front side) of the image shake correction apparatus 100 of FIG. 1 is an exploded perspective view (back side) of the image shake correction apparatus 100 of FIG. FIG. 1 is a front view and a cross-sectional view of the image blur correction apparatus 100 of FIG. 1 is a side view and a cross-sectional view of the image blur correction apparatus 100 in FIG. FIG. 1 is a rear view of the image blur correction apparatus 100 of FIG. Front view and sectional view when shift barrel 102 moves in the positive direction of the Y-axis Front view and sectional view when shift barrel 102 moves in the negative direction of the Y-axis Front view of the shift barrel 102 in the middle of assembly in the first embodiment Front view of the coil 103 (104) according to FIG. Sectional enlarged view of the image blur correction apparatus 200 according to the second embodiment of the present invention. Sectional drawing which shows the assembly method of the image blurring correction apparatus 200 which concerns on Example 2 of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The lens barrel of the present invention is used in optical devices such as digital cameras and video cameras. When the lens barrel 10 of the present invention is mounted on the camera body, the lens barrel 10 moves within a fixed portion (base plate) (fixed tube) 101 and an optical axis orthogonal plane (XY plane), and a correction lens group for image blur correction. 13 and a lens holding part (shift lens barrel) 102 supported by the fixing part 101. In addition, driving means (coils 103 and 104, magnets 105 and 106) for driving the lens holding unit 102 in the plane orthogonal to the optical axis (in the XY plane) is provided. Here, one of the driving means is a magnet and the other is a coil.

  One member (coils 103 and 104) constituting the driving means is fixed to the lens holding portion 102 with a gap when viewed from the optical axis direction, and the other members (magnets 105 and 106) constituting the driving means are fixed portions. 101 is fixed. A light shielding means 109 made of a flexible or elastic light shielding sheet is provided so as to close a gap between the lens holding portion 102 and one member (coils 103, 104) of the driving means when viewed from the optical axis direction. . The light shielding means 109 is provided on the lens holding portion 102 in two directions in which the lens holding portion 102 moves perpendicularly to each other in the plane orthogonal to the optical axis. One surface (adhesion surface) of the light shielding means 109 is adhered and fixed to the light shielding means fixing portion (sheet pasting portion) 102g of the lens holding portion. One end of the light shielding means 109 is in contact with a surface 104a (a surface parallel to the optical axis) on the lens holding portion side of one member (magnet 104) of the driving means.

The light shielding means is fixed to the light shielding means fixing portion 102g at a finite angle α between a part of the light shielding means and the direction orthogonal to the optical axis in the optical axis plane (YZ plane) including the optical axis. For example, the angle α is 4 ° <α <45 °
It is fixed to the light shielding means fixing portion 102g so as to satisfy the following conditions.

[Example 1]
A lens barrel 10 according to a first embodiment of the present invention will be described. FIG. 1 is a perspective view of a main part of the lens barrel 10. Reference numerals 11 and 12 denote shake detection sensors that detect shake given to the lens barrel 10. The shake detection sensor 11 detects vertical shake (pitch shake), and the shake detection sensor 12 detects lateral shake (yaw shake). Reference numeral 13 denotes a correction lens for image blur correction that constitutes a part of the imaging optical system, and is displaced in a direction perpendicular to the optical axis (within the plane orthogonal to the optical axis) to decenter the optical axis and correct image blur. Reference numeral 100 denotes a shake correction device that displaces the correction lens 13 within the plane orthogonal to the optical axis. Reference numerals 14 and 15 denote position sensors, which detect displacement in the direction perpendicular to the optical axis of the correction lens 13. The position sensor 14 detects a displacement corresponding to the yaw direction, and the position sensor 15 detects a displacement corresponding to the pitch direction.

  Reference numerals 16 and 17 denote shake correction circuits, which perform closed-loop control of the position of the correction lens 13 based on outputs from the shake detection sensors 11 and 12 and outputs from the position sensors 14 and 15. When the output from the position sensors 14 and 15 is controlled so as to approach the reference value, the correction lens 13 is stabilized at a position substantially at the center of the optical axis. In this state, for example, a value obtained by giving a predetermined gain to the outputs from the shake detection sensors 11 and 12 is added to the input value as a target value, so that the correction lens 13 is optically aligned with the shake of the lens barrel 10. Displacement in the vertical direction and shake correction control.

  Hereinafter, a lens barrel having the image blur correction device 100 will be described with reference to FIGS. The X direction and the Y direction in the figure are both directions orthogonal to the optical axis, and are orthogonal to each other. The X direction corresponds to the direction of lateral shake (yaw shake) detected by the shake detection sensor 12, and the Y direction corresponds to the direction of vertical shake (pitch shake) detected by the shake detection sensor 11. The position sensor 14 corresponds to a PSD 125 described later, and the position sensor 15 corresponds to a PSD 124 described later. Unless otherwise specified, it is assumed that the correction lens 13 (not shown) and the shift barrel 102 are located at the reference position.

  Reference numeral 101 denotes a ground plate (fixed portion) formed of polycarbonate resin or the like, and is fixed to the lens barrel 10 via rollers 17a, 17b, and 17c (not shown). The base plate 101 has an opening 101a, a lock yoke fixing portion 101b, a wall portion 101c, and a rubber fixing portion 101d. The wall 101c has a cylindrical shape extending in the optical axis direction, restricts the movement of the ball 111c in the plane orthogonal to the optical axis, and prevents the ball 111c from dropping off.

  The rollers 17a, 17b, and 17c are arranged at 120 ° intervals equally in the circumferential direction around the optical axis with the central axis direction orthogonal to the optical axis. In addition, two or three of the three rollers 17a, 17b, and 17c are configured by decentering the fitting center on the lens barrel 10 side and the fitting center on the image blur correction device 100 side, so that the rotation is possible. By doing so, it is possible to adjust the inclination of the image blur correction apparatus 100 with respect to the optical axis.

  Reference numeral 102 denotes a shift lens barrel (lens holding portion) formed of polycarbonate resin or the like. The shift barrel 102 includes an outer peripheral portion 102a, an opening portion 102b, a sub-plate fixing portion 102c, a pitch slit 102d, a yaw slit 102e, a lock projection 102f, and a sheet sticking portion (light-shielding means fixing portion) 102g (FIG. 4C). Have. The correction lens 13 is inserted into the opening 102b and fixed integrally with the shift barrel 102. The sub-plate fixing portion 102c has a cylindrical shape extending in the optical axis direction, restricts the movement of the ball 116c in the plane orthogonal to the optical axis, and prevents the ball 116c from dropping off. The sheet pasting portion 102g is formed of a plane having a predetermined angle α (5 ° <α <45 °) from a plane orthogonal to the optical axis.

  FIG. 5A is a cross-sectional view of the main part including the optical axis of the shift barrel 102 (side view of the main part). FIG. 5B is a cross-sectional view of a main part orthogonal to the optical axis of the shift barrel 102. The drive range of the shift barrel 102 will be described with reference to the cross-sectional view of FIG. The outer peripheral portion 102a of the shift barrel 102 and the opening 101a of the base plate 101 are configured to have a predetermined distance D1 in the direction perpendicular to the optical axis. That is, the circular portions A1 to A6 of the outer peripheral portion 102a of the shift barrel 102 are opposed to the circular portions B1 to B6 of the opening 101a with a distance D1, respectively. The straight portions A11 and A12 of the outer peripheral portion 102a are separated by 90 degrees in the circumferential direction and face the straight portions B11 to B12 of the opening 101a with a distance D1. Furthermore, the outer circumferences A7 to A10 of the four lock projections 102f provided at intervals of 90 degrees in the circumferential direction of the shift barrel 102 have distances D1 ′ larger than the distances D1 and the parts B7 to B10 of the opening 101a, respectively. Facing each other.

  Therefore, when the shift lens barrel 102 moves in the plane orthogonal to the optical axis by D1 from the reference position, the outer peripheries A1 to A6 of the outer periphery 102a of the shift lens barrel 102 and the inner peripheral portions B1 to B1 of the opening 101a of the base plate 101 B6 contacts. As a result, the movable range in the optical axis orthogonal plane of the shift barrel 102 is restricted to D1 from the reference position.

  In this embodiment, the reference position of the shift lens barrel 102 is set to a position where the center of the correction lens 13 coincides with the optical axis center. However, the center of the correction lens 13 with respect to the optical axis center at the reference position of the shift lens barrel 102. You may comprise so that it may decenter.

  In this embodiment, the movement range of the shift barrel 102 is limited by the contact between the circular portions A1 to A6 on the outer periphery of the outer peripheral portion 102a and the circular portions B1 to B6 on the inner periphery of the opening 101a. For example, it may be limited by other methods such as setting a movable range for control. Reference numerals 103 and 104 denote a yaw coil and a pitch coil that constitute a part of the driving means, and are fixed to the shift barrel 102 with a UV adhesive or the like. The yaw coil 103 performs horizontal driving, and the pitch coil 104 performs vertical driving.

  105 a to 105 d and 106 a to 106 d are magnets made of a neodymium magnet or the like, and are provided on the base plate 101. The magnets 105 a to 105 d constitute the first magnet group 105, and the magnets 106 a to 106 d constitute the second magnet group 106. As shown in the figure, they are arranged so that the N pole and the S pole face in the optical axis direction. Reference numeral 107 denotes a first yoke made of a magnetic material, which is fixed to the ground plane 101 in a state where the relative positioning with respect to the ground plane 101 is performed by positioning pins and screws. The first magnet group 105 is magnetically attracted and fixed. Moreover, it has the groove part 107a, 107b extended in the Y direction in the figure, and the ball rolling part 107c which consists of a plane orthogonal to an optical axis direction. Reference numeral 108 denotes a second yoke made of a magnetic material, which is fixed to the base plate 101 together with the shift substrate 126 in a state where the relative positioning with respect to the base plate 101 is performed by positioning pins and screws. The second magnet group 106 is magnetically attracted and fixed to the second yoke 108.

  4A is a cross-sectional view of a main part orthogonal to the optical axis of the shift barrel 102, FIG. 4B is a cross-sectional view of a main part including the optical axis La of the shift barrel 102, and FIG. It is explanatory drawing of a part of (b). A driving principle of the shift barrel 102 will be described with reference to a cross-sectional view of the main part of FIG. Magnets 105a to 105d and 106a to 106d provided on the base plate 101 are magnetized to N and S poles in the optical axis direction. FIG. 4B shows magnets 105c and 105d, magnets 106c and 106d, a first yoke 107, and a second yoke 108, which form a magnetic path indicated by a dotted arrow in the figure. One surface of the pitch coil 104 is disposed to face the magnets 105c and 105d with a predetermined interval in the optical axis direction. Further, the other surface of the pitch coil 104 is disposed so as to face the magnets 106c and 106d with a predetermined interval in the optical axis direction.

  When the current is supplied to the pitch coil 104, a force in the Y direction is generated in the pitch coil 104 by an electromagnetic force acting between the magnets 105c, 105d, 106c, and 106d, and the shift barrel 102 is driven in the Y direction. The drive direction of the shift barrel 102 is reversed depending on the energization direction to the pitch coil 104. The shake correction circuit 15 controls the current flowing through the pitch coil 104 to drive the correction lens 13 fixed integrally with the shift barrel 102 freely in the Y direction, thereby performing shake correction control. The same applies to driving in the X direction by energizing the yaw coil 103.

  109 (109a, 109b) is a light shielding sheet (light shielding means) made of a rubber sheet or the like having light shielding properties and flexibility or elasticity, and an adhesive is applied to one surface (adhesion surface). The light shielding sheet 109 is fixed to the shift barrel 102. As shown in the enlarged view of FIG. 4C, the light shielding sheet 109 (109b) has one end (flexible portion) abutting against a plane surface 104a with respect to the optical axis La of the outer peripheral portion of the coils (driving means) 103, 104. Touching. In this state, it is affixed to the sheet affixing part (light-shielding means fixing part) 102g of the shift barrel 102. Further, the light shielding sheet (light shielding means) 109 is fixed to the shift barrel 102 within a range that does not protrude the thickness t in the optical axis direction of the coils 103 and 104. The light shielding sheet 109 shields at least a part of the light beam passing between the shift barrel 102 and the coil 104. The light shielding sheet 109 is fixed to the sheet pasting portion 102 at an angle α (α ≠ 0) with respect to the optical axis orthogonal plane Lb.

  FIG. 9 is a front view of the shift barrel 102 during assembly. FIG. 9 shows a state in which the coils 103 and 104 and the light shielding sheet 109 are assembled to the shift barrel 102. As shown by the dotted lines in FIG. 10B, the coils 103 and 104 may have manufacturing errors that cause the outer dimensions to be large or small. Therefore, in order to prevent interference with the shift barrel 102 when the outer dimension becomes large, the shift barrel 102 and the coil 103 are configured to have a predetermined gap d in the X direction. Similarly, the shift barrel 102 and the coil 104 are configured to have a predetermined gap d in the Y direction. The gap d may vary due to manufacturing errors, assembly errors between the shift barrel 102 and the coils 103 and 104, and the like. However, since the light shielding sheet 109 has elasticity, even if the gap d varies, the other end is attached to the sheet attaching portion 102g of the shift barrel 102 with one end abutting the outer periphery of the coils 103 and 104. Can be attached. Therefore, the gap between the shift barrel 102 and the coils 103 and 104 can be reliably shielded from light.

  For example, if the length in the X direction (Y direction) in the plane orthogonal to the optical axis of the light shielding sheet 109 is L1, the light shielding sheet 109b is shifted in the range of L1 in the X direction, and the light shielding sheet 109a is shifted in the range of L1 in the Y direction. The gap between the lens barrel 102 and the coils 103 and 104 is shielded from light. Further, in manufacturing, the straight portions 103a and 104a of the outer shape viewed from the optical axis direction of the coils 103 and 104 may be curved instead of straight. For example, as shown by the dotted line in FIG. 10 (a), it has a curvature R that is convex outward. Even in such a case, since the light shielding sheet 109 has flexibility (flexible portion), the outer shape of the coils 103 and 104 can be bent and brought into contact with the surface on the correction lens side. Therefore, the gap between the shift barrel 102 and the coils 103 and 104 can be reliably shielded from light.

  The light shielding sheet 109b reflects the light beam indicated by, for example, a dotted line A in FIG. 4C (entering from the inner periphery of the second yoke 108, passing through the gap between the shift barrel 102 and the coil 104, and reflecting to the outer shape of the coil 104. , The light beam emitted from the opening 101a of the main plate 101) is blocked. As a result, it is possible to prevent the harmful rays from reaching the image plane (image plane). Similarly, the light beam passing through the gap between the shift barrel 102 and the coil 103 can be blocked by the light shielding sheet 109a. It should be noted that light is shielded by a part of the shift barrel 102 except for a portion where there is a gap between the shift barrel 102 and the coils 103 and 104. For example, a light ray indicated by a dotted line B that has passed through the opening 101 a without passing through the correction lens 13 (light that enters from the inner periphery of the second yoke 108 and exits from the opening 101 a of the base plate 101) is caused by a part of the shift barrel 102. It is configured to block.

  Reference numeral 110 denotes a first sheet metal, which includes grooves 110a and 110b extending in the Y direction in the drawing, a flat portion 110c perpendicular to the optical axis direction, grooves 110d and 110e extending in the X direction in the drawing, and extending in the Y direction in the drawing. Long holes 110f and 110g are provided. 111a to 111c are balls made of a nonmagnetic material. The balls 111a to 111c are collectively referred to as a first ball group 111. The ball 111 a is sandwiched between the groove 107 a of the first yoke 107 and the groove 110 a of the first sheet metal 110, and the ball 111 b is sandwiched between the groove 107 b of the first yoke 107 and the groove 110 b of the first sheet metal 110. Yes. The ball 111 c is sandwiched between the flat portion 132 a of the first lock yoke 132 and the flat portion 110 c of the first sheet metal 110.

  The first sheet metal 110 is urged toward the base plate 101 in the optical axis direction by thrust springs 117a to 117c described later. Therefore, the first ball group 111a to 111c are supported in the optical axis direction with respect to the base plate 101 via the first yoke 107 and the first lock yoke 132 at three locations. Furthermore, the ball 111 a can roll only in the Y direction in the drawing along the groove 107 a of the first yoke 107 and the groove 110 a of the first sheet metal 110. Further, the ball 111b can roll only in the Y direction in the drawing along the groove 107b of the first yoke 107 and the groove 110b of the first metal plate 110. Therefore, the first sheet metal 110 is guided by the balls 111a, the grooves 107a, the grooves 110a, and the balls 111b, the grooves 107b, and the grooves 110b, and can move only in the Y direction with respect to the ground plane 101 within the plane orthogonal to the optical axis. Will be supported.

  112 and 113 are stoppers made of a non-magnetic material. The stoppers 112 and 113 are inserted into the long holes 110f and 110g of the first sheet metal 110 and fixed to the base plate 101 by press-fitting or bonding. The displacement of the first metal plate 110 in the optical axis direction is restricted, and the first ball group 111 is prevented from falling off. Reference numeral 114 denotes a sub plate, which is fixed or press-fitted to the sub plate fixing portion 102c of the shift barrel 102, and is fixed horizontally to a surface perpendicular to the optical axis direction. Reference numeral 115 denotes a second sheet metal, which has grooves 115a and 115b extending in the X direction in the drawing. The second sheet metal 115 is fixed to the shift barrel 102 with screws or the like.

  116a to 116c are balls made of a nonmagnetic material. The balls 116 a to 116 c are collectively referred to as a second ball group 116. The ball 116a is sandwiched between the groove 110d of the first sheet metal 110 and the groove 115a of the second sheet metal 115, and the ball 116b is sandwiched between the groove 110e of the first sheet metal 110 and the groove 115b of the second sheet metal 115. Yes. Further, the ball 116 c is sandwiched between the flat portion 107 c of the first yoke 107 and the sub plate 114. The shift barrel 102 and the second metal plate 115 are urged toward the base plate 101 in the optical axis direction by thrust springs 117a to 117c described later. Therefore, the second ball group 116a to 116c are supported in the optical axis direction with respect to the base plate 101 and the first metal plate 110 at three locations.

  Further, the ball 116 a can roll only in the X direction in the drawing along the groove 110 d of the first metal plate 110 and the groove 115 a of the second metal plate 115. Further, the ball 116b can roll only in the X direction in the drawing along the groove 110e of the first metal plate 110 and the groove 115b of the second metal plate 115. Therefore, the shift barrel 102 is guided by the ball 116a, the groove 110d, the groove 115a, and the ball 116b, the groove 110e, and the groove 115b, and moves only in the X direction with respect to the first sheet metal 110 within the plane orthogonal to the optical axis. Will be supported as possible.

  As described above, the first sheet metal 110 is movable only in the Y direction with respect to the base plate 101 in the direction orthogonal to the optical axis direction. Further, the shift barrel 102 is movable only in the X direction with respect to the first sheet metal 110. Therefore, the shift barrel 102 is supported so as to be movable only in the X direction and the Y direction with respect to the base plate 101 in a direction orthogonal to the optical axis direction, and movement in the rotational direction is restricted.

  117a to 117c are thrust springs placed between the main plate 101 and the shift barrel 102. The shift lens barrel 102, the second metal plate 115, and the first metal plate 110 are arranged in the circumferential direction through the first ball group 111 and the second ball group 116, and the base plate 101 is arranged in the optical axis direction. It is energizing towards the side. Reference numerals 121a to 121d denote metal columns that are sandwiched and fixed between the first yoke 107 and the second yoke 108. The columns 121a to 121d support the attractive force between the first magnet group 105 and the second magnet group 106, thereby preventing each member from being deformed.

  Reference numerals 122 and 123 denote infrared light emitting diodes (IREDs), which are fixed to the shift barrel 102. Infrared rays are emitted from the IREDs 122 and 123 through a pitch slit 102d and a yaw slit 102e provided in the shift barrel 102. The infrared light emitting diode 122 is a pitch IRED, and the infrared light emitting diode 123 is a yaw IRED. Reference numerals 124 and 125 denote semiconductor position detection elements (PSDs) that detect light emitted from the IREDs 122 and 123 to detect the position of the shift barrel 102. The PSD 124 is a pitch PSD, and detects the light of the pitch IRED 122 to detect the position of the shift barrel 102 in the Y direction. The PSD 125 is a PSD for yaw, and detects the light emitted from the yaw IRED 123 to detect the position of the shift barrel 102 in the X direction.

  Reference numeral 126 denotes a shift board on which PSDs 124 and 125 are mounted. The shift board 126 is fixed to the ground plane 101 with screws. A flexible substrate (not shown) transmits power from the shift substrate 126 to the coils 103 and 104, the IREDs 122 and 123, and the lock coil 130, and transmits detection signals from the PSDs 124 and 125 and the photo interrupter 135 to the shift substrate 126.

Reference numeral 129 denotes a lock ring, which is assembled to the main plate 101 by a so-called bayonet method. As shown in FIGS. 6A and 6B, the lock ring 129 is fitted to the inner periphery of the base plate 101 and is supported by the base plate 101 so as to be rotatable around the optical axis. The lock ring 129 includes a light shielding portion 129a, a lock portion 129b, an unlock portion 129c, stopper contact portions 129d and 129e, and a slider contact portion 129f.
A lock coil 130 is fixed to the lock ring 129 with a UV adhesive or the like.

  Reference numeral 131 denotes a lock magnet made of a neodymium magnet or the like. The lock magnet 131 includes lock magnets 131a to 131d. As shown in the figure, they are arranged so that the N pole and the S pole face in the optical axis direction. Reference numeral 132 denotes a first lock yoke made of a magnetic material, which is fixed to the base plate 101 with screws. Further, lock magnets 105 a and 105 b are magnetically attracted and fixed to the first lock yoke 132. Moreover, it has the plane part 132a orthogonal to the optical axis direction. Reference numeral 133 denotes a second lock yoke made of a magnetic material, which is fixed to the base plate 101 with screws. Lock magnets 105c and 105d are magnetically attracted and fixed to the second lock yoke 133.

  A stopper rubber 134 made of an elastic material such as rubber is inserted into the rubber fixing portion 101d of the main plate 101, and is held and fixed between the first yoke 107 and the second lock yoke 133 of the main plate 101. Yes. Reference numeral 135 denotes a photo interrupter that detects the transmission of light between the gaps, and is fixed to the base plate 101 with screws. When the light shielding portion 129a of the lock ring 129 passes through the gap of the photo interrupter 135, the rotation of the lock ring 129 can be detected.

  136 (136a to 136c) is a slider made of a highly slidable resin material such as POM, and is arranged radially with respect to the optical axis and even in the circumferential direction. The base plate 101 is supported so as to be movable in a direction toward the center of the optical axis, and is held so as to contact the slider contact portion 129f of the lock ring 129. Reference numeral 137 (137a to 137c) denotes a slider spring that urges the slider 136 toward the center of the optical axis.

  The locked state and unlocked state of the shake correction apparatus 100 will be described with reference to FIG. In FIG. 6, the second lock yoke and the lock magnets 105c and 105d are not shown for the sake of explanation.

  FIG. 6A is a rear view illustrating the shake correction apparatus 100 in a locked state. In the locked state, the stopper contact portion 129d of the lock ring 129 is in contact with the stopper rubber 134. At this time, the four lock projections 102f of the shift barrel 102 and the four lock portions 129b of the lock ring 129 face each other and maintain a predetermined distance D2. When the radius of the circumscribed circle of the lock projection 102f is R1, and the radius of the lock portion 129b is R2, the distance D2 is equal to R2-R1, and is below the movable range D1 in the plane perpendicular to the optical axis of the shift barrel 102. The following equation holds.

D2 = R2-R1
D1> D2
As described above, the movement of the shift barrel 102 in the direction perpendicular to the optical axis can be moved only in the X direction and the Y direction, and the movement in the rotational direction is restricted. Therefore, in the locked state, the shift amount of the shift barrel 102 in the direction perpendicular to the optical axis is limited to a range of the distance D2 from the reference position. It is desirable that the distance D2 is as close to zero as possible.

  When a voltage in a predetermined direction is applied to the lock coil 130, a force in the rotational direction about the optical axis is applied to the lock ring 129 (direction A in the figure) due to the interaction between the magnetic field generated in the lock coil 130 and the magnetic field of the lock magnet 131. ) Occurs. As a result, the stopper abutting portion 129e of the lock ring 129 rotates until it abuts against the stopper rubber 134, and the shake correction device 100 is unlocked. During the rotation, the light shielding portion 129a of the lock ring 129 passes through the gap of the photo interrupter 135 provided on the base plate 101, so that the rotation of the lock ring 129 can be detected.

  Since the slider abutting portion 129f provided on the outer peripheral portion of the lock ring 129 is formed with a gentle convex portion protruding in the radial direction, the slider 136 has a convex portion in the middle of the locked state and the unlocked state. Will be overcome. At that time, the lock ring 129 must rotate by overcoming the rotational load caused by the urging force of the slider spring 137 in the center of the optical axis, thereby preventing the locked state and the unlocked state from being easily switched by, for example, an impact. Can do.

  FIG. 6B is a rear view showing the unlocking state of the shake correction apparatus 100. In the unlocked state, the stopper contact portion 129e of the lock ring 129 is in contact with the stopper rubber 134. At this time, the four lock projections 102f of the shift barrel 102 and the four unlock portions 129c of the lock ring 129 are opposed to each other, and a predetermined distance D3 is maintained. The following equation holds for the movement range D1 of the shift barrel 102 in the plane orthogonal to the optical axis.

D3>D1> D2
Therefore, in the unlocked state, the shift barrel 102 does not interfere with the lock ring 129 and can move within the distance D1 from the reference position in the direction perpendicular to the optical axis. The shake correction apparatus 100 can freely switch between a locked state and an unlocked state by applying a voltage to the lock coil 130. For example, the shake correction apparatus 100 is in a locked state except when performing shake correction control, and is caused by unnecessary movement of the shift barrel 102 Deterioration of optical performance can be prevented.

  Hereinafter, the case where the shift barrel 102 is moved from the reference position j for image blur correction will be described with reference to FIGS. FIG. 7 shows the image blur correction apparatus 100 in a state in which the shift barrel 102 has moved by a distance S in the positive direction in the Y direction from the reference position. As can be seen from FIG. 7A, the range in which the lower side of the shift barrel 102 in the drawing is exposed from the opening 108 a of the second yoke 108 is large. Therefore, the possibility that the light beam passes through the opening 101a of the main plate 101 increases as compared with the case where the shift barrel 102 is located at the reference position.

  However, in such a case, in addition to the light beam indicated by the dotted line A as described in FIG. 4C, the light shielding sheet 109b blocks the light beam reaching the imaging plane indicated by the dotted line C in FIG. 7C. can do. Here, the light beam indicated by the dotted line C enters from the inner periphery of the second yoke 108, passes through the gap between the shift barrel 102 and the coil 104, exits from the opening 101 a of the base plate 101, and reaches the imaging surface. is there. Therefore, even when the shift barrel 102 moves, it is possible to prevent harmful rays from reaching the imaging plane.

  Similarly, the light beam passing through the gap between the shift barrel 102 and the coil 103 can be blocked by the light shielding sheet 109a. As shown in FIG. 7A, the length L1 of the light shielding sheet 109 is the gap between the shift barrel 102 exposed from the second yoke 108 and the coil 104 within the range in which the shift barrel 102 can move. It is desirable to be larger than the length L2 of the gap when the maximum is.

  FIG. 8 shows the image blur correction apparatus 100 in a state where the shift barrel 102 has moved by S in the negative Y direction from the reference position. As can be seen from FIG. 8B, the range in which the upper side of the shift barrel 102 in the figure is exposed from the opening 108 a of the second yoke 108 is large. Therefore, the possibility that the light beam passes through the opening 101a of the main plate 101 increases as compared with the case where the shift barrel 102 is located at the reference position. However, in such a case, the light beam indicated by the dotted line B as described in FIG. 4C can be blocked by a part of the shift barrel 102. Therefore, even when the shift barrel 102 moves, it is possible to prevent harmful rays from reaching the imaging plane.

  As can be seen from FIG. 8C, the coil 104 and the light shielding sheet 109b enter the gap in the optical axis direction between the magnet 105d and the magnet 106d. As described above, the length of the light shielding sheet 109b in the optical axis direction is fixed within a range that does not protrude the thickness t of the coils 103 and 104 in the optical axis direction. Therefore, even if the shift barrel 102 moves, there is no possibility that the light shielding sheet 109 interferes with other parts such as the magnet 105d and the magnet 106d. Therefore, it is not necessary to provide a special clearance with other parts, and the image blur correction apparatus 100 can be easily downsized. In general, the closer the distance between the coil and the magnet, the greater the driving force. For this reason, it is desirable that the gap in the optical axis direction between the first magnet group 105 and the second magnet group 106 be as small as possible without causing interference even if the dimensional tolerances of the components are stacked.

  In this embodiment, even if the gap between the magnet 105d and the magnet 106d in the optical axis direction is reduced and the distance between the coil and the magnet is reduced, there is no possibility of interference with the light shielding sheet 109b. Therefore, the gap in the optical axis direction between the first magnet group 105 and the second magnet group 106 can be reduced to increase the driving force of the shift barrel 102, and the image shake correction apparatus 100 can be saved in power. .

[Example 2]
With respect to the lens barrel using the image blur correction apparatus 200 according to the second embodiment of the present invention, only the parts different from the first embodiment will be described. FIG. 11 shows an enlarged view of a part of the cross section of the image blur correction apparatus 200, which corresponds to FIG. 4C in the first embodiment. The sheet sticking part 202g of the shift barrel 202 is provided on the side where the coil 204 is inserted, and is a plane having a predetermined angle α (5 ° <α <45 °) from a plane orthogonal to the optical axis.

  Reference numeral 209b denotes a light shielding sheet (light shielding means) made of a light shielding and flexible or elastic rubber sheet, and an adhesive is applied to one surface (one surface, adhesive surface). One side surface A of the rectangular light shielding sheet 209b is attached so that the adhesive application surface (adhesion surface) of the light shielding sheet 209b faces the sheet attaching portion 202g of the shift barrel 202. Further, the other end B of the light shielding sheet 209b is bent in the optical axis direction so that the opposite surface of the light shielding sheet 209b opposite to the adhesive application surface faces the outer peripheral portion 204a of the plane that is flat with the optical axis of the coil 204. Abut. Similarly, a light shielding sheet 209a (not shown) arranged in a direction perpendicular to the light axis with respect to the light shielding sheet 209a also contacts the outer peripheral portion 203a (not shown) of the coil 203 (not shown) with one end bent. Touching.

  A dotted line indicated by C in the drawing indicates a portion corresponding to one end B of the light shielding sheet 209b in a state where there is no deflection. When the length of the short side of the light shielding sheet 209b having a rectangular shape is L3, the length in the Y direction from the end A to the end C is represented by L3 cos α. When the length of the sheet sticking portion 202g of the shift barrel 202 is L4, the length in the Y direction is represented by L4cosα. As described above, the gap d between the shift barrel 202 and the coils 203 and 204 may vary due to manufacturing errors or assembly errors. When the maximum value of the variation in the gap d is dmax and the minimum value is dmin, in this embodiment, each component is configured so that the following expression is established.

L3cosα> L4cosα + dmax
Therefore, even when the gap d reaches the maximum value dmax, the light shielding sheet 209b bends in contact with the coils 203 and 204 and can reliably shield the gap between the shift barrel 202 and the coils 203 and 204. Even when the gap d reaches the minimum value dmin, the light shielding sheet 209 is configured not to protrude the thickness t of the coils 203 and 204 in the optical axis direction. When the light shielding sheet 209 is bent in the optical axis direction, the force F acts in the direction of returning to the plane like the leaf spring. The direction of the force F is the direction of the force in the direction in which the shift barrel 202 and the light shielding sheet 209 are peeled off.

  However, in this embodiment, since the sheet sticking portion 202g of the shift barrel 202 has a predetermined angle α from the surface orthogonal to the optical axis, compared to the case where the sheet sticking portion 202g is a surface orthogonal to the optical axis. , The force F can be reduced. Therefore, it is possible to prevent the shift barrel 202 and the light shielding sheet 209 from being peeled off and interfere with other parts due to a change with time, a shake correction operation, an external impact, and the like, and to maintain the reliability of the image shake correction apparatus 200. it can.

  FIG. 12 is a cross-sectional view illustrating an assembling method of the image blur correction apparatus 200. FIG. 12A shows a state after the light shielding sheet 209 is attached to the shift barrel 202 and before the coils 203 and 204 are attached. In this state, the light shielding sheet 209 is not bent and extends straight along the sheet sticking portion 202g of the shift barrel 202.

  From this state, the coils 203 and 204 are assembled to the shift barrel 202 from the subject side in the optical axis direction (the arrow direction in the figure). As described above, even when the gap d reaches the maximum value, a part of the light shielding sheet 209 is configured to come into contact with the outer peripheral portion 204a of the coils 203, 204. Causes an overlap as indicated by A in the figure. Therefore, when attaching the coils 203 and 204, the light shielding sheet 209 can be bent by the assembling force. Further, at this time, since the surface opposite to the adhesive application surface of the light shielding sheet 209 contacts the outer peripheral portion 204a of the coils 203, 204, there is no possibility that the light shielding sheet 209 adheres to the coils 203, 204. FIG. 12B shows a state immediately after the coils 203 and 204 are attached to the shift barrel 202. The light shielding sheet 209b is in contact with the outer peripheral portion 204a of the coil 204 with one end bent as shown in FIG.

  In the assembling method described above, the light shielding sheet 209 can be bent at the same time as the coils 203 and 204 are assembled. At this time, the light shielding sheet 209 can be prevented from adhering to the coils 203 and 204. Easy to assemble.

  As described above, according to each embodiment, it is possible to provide a lens barrel having an image blur correction device that is small and can effectively block the arrival of harmful rays on the imaging surface.

DESCRIPTION OF SYMBOLS 10 Lens barrel 11,12 Shake detection sensor 13 Correction lens 100 Image shake correction apparatus 101 Base plate 102 Shift barrel 103 Yaw coil 104 Pitch coil 105 1st magnet group 106 2nd magnet group 107 1st yoke 108 2nd Yoke 109 Shading sheet

Claims (7)

  It moves in the plane orthogonal to the optical axis, holds the correction lens group for image blur correction, and drives the lens holder supported by the fixed part and the lens holder in the optical axis orthogonal plane. The driving means and one member constituting the driving means are fixed to the lens holding portion with a gap when viewed from the optical axis direction, and the other members constituting the driving means are fixed to the fixing portion. One surface is fixed to the light-shielding means fixing portion of the lens holding portion, and one end is in contact with the surface on the lens holding portion side of one member of the driving means, and the lens holding portion and one member of the driving means And a light shielding means disposed so as to close the gap when viewed from the optical axis direction. The light shielding means is 4 ° <α <45 °, where α is an angle formed by a part of the light shielding means and the optical axis orthogonal direction in the optical axis plane including the optical axis.
2. The lens barrel according to claim 1, wherein the lens barrel is fixed to the light shielding means fixing portion so as to satisfy the following condition.   The light shielding means is composed of a flexible or elastic light shielding sheet, and one surface of the light shielding means is composed of an adhesive surface bonded and fixed to the light shielding means fixing portion, and the adhesive surface of one end portion of the light shielding means. 3. The lens barrel according to claim 1, wherein a surface on the opposite side is in contact with a surface parallel to an optical axis of one member of the driving means in a bent state.   The fixed part has an opening into which the correction lens or the lens holding part is inserted, and a part of the lens holding part passes through the opening to reach the imaging plane without passing through the correction lens. The lens barrel according to any one of claims 1 to 3, wherein the lens barrel is configured to shield light.   The light shielding means is fixed to the lens holding portion so that the length in the optical axis direction does not come out of the length in the optical axis direction of one member constituting the driving means fixed to the lens holding portion. The lens barrel according to any one of claims 1 to 4, wherein: 6. One of the members constituting the driving means and the other member constituting the driving means, wherein one is a magnet and the other is a coil. Lens barrel.   An optical apparatus comprising the lens barrel according to claim 1.