JP2001100074A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the frictional force of a shift guide part which is generated by a flexible substrate connecting a fixed part and a shift movable part together and to display superior hand-shake correcting performance. SOLUTION: This lens barrel has a shift movable part 15 constituted so that some of lens groups move in parallel in a plane perpendicular to the optical axis and fitting parts 27P and 27Y of a flexible substrate 25, connected between a fixed part 17 of the lens barrel and the above shift movable part, on the side of the shift movable part are given a flexibility of movement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is incorporated in a photographing apparatus such as a video camera and a digital still camera for recording moving images and still images using a solid-state photographing element such as a CCD, and an observation apparatus such as a binocular or an astronomical telescope. The present invention relates to improvement of a lens barrel.

[0002]

2. Description of the Related Art Conventionally, in order to prevent image blur due to camera shake or the like which tends to occur during hand-held shooting, camera shake information is detected by a camera shake detecting means, and the camera shake is detected optically or electronically in accordance with the detection result. Various devices have been proposed that realize camera shake correction by canceling.
Among them, Japanese Patent Application No. 10-109499 has a so-called shift-type image stabilizing means for performing camera shake correction by moving a certain lens group among a plurality of lens groups in a plane perpendicular to the optical axis. A zoom lens is disclosed. In this proposal, three pins are radially press-fitted into a lens barrel holding a lens group to be shifted, and three pins are respectively inserted into three long holes formed in a circumferential direction on a fixing member. The lenses are fitted with a certain gap, and the shifting lens group is restricted to a plane perpendicular to the optical axis. Furthermore, by using the magnetic force acting between the magnet and the ferromagnetic material to urge the guide in the optical axis direction in one direction, the optical performance is improved and the guide is rattled during driving. The aim is to reduce the resulting operating noise. Japanese Patent Application Laid-Open No. 6-289465 discloses that in a flexible substrate for connecting a fixed portion and a shift movable portion, the load in the optical axis direction and the shift 2 direction is reduced by devising the shape and arrangement of the extension portion. There is disclosed a shake correction device capable of preventing an adverse effect on the driving of the camera.

[0003]

In recent years, in a photographing apparatus equipped with a lens barrel, further miniaturization and a design with a small protrusion are required to improve portability and storage. A smaller lens barrel is also required. However, when the lens barrel is further miniaturized, the space for routing the flexible substrate that connects the fixed portion and the shift movable portion is significantly restricted, and the rigidity of the flexible substrate is increased. It is becoming difficult to reduce the force generated in the optical axis direction due to the flexible substrate generated during assembly to a level that does not cause any problem. Therefore, even if the shift movable part is urged in the optical axis direction using a magnet or the like, the shift movable part is more strongly pressed against the guide part due to the variation in the generated force of the flexible substrate in the optical axis direction, and the friction is reduced. The size of the shift unit becomes extremely large, or the urging by the magnet or the like is invalidated, which adversely affects the driving of the shift unit.

On the other hand, in a CCD for converting a subject image formed on a focal plane by a photographing optical system into an electric signal, a CCD having a smaller pixel pitch can be produced due to the progress of semiconductor fine processing technology. This has made it possible to further reduce the size of the optical system due to the reduction in the imaging area of the image sensor with the same number of pixels, and to further increase the resolution of the optical system due to the increase in the number of pixels due to the same area or area enlargement. Flow is occurring. In the former, since the amount of movement of the shift lens group for correcting the same amount of camera shake is substantially proportional to the imaging area, a smaller movement is required, and the space for routing the flexible substrate is also reduced, and as described above. A similar problem occurs. In the latter case, the resolution is degraded unless a smaller blur can be corrected. Therefore, it is necessary to reduce the frictional force generated in the guide portion of the shift movable portion so that it can be driven more minutely.

(Object of the Invention) An object of the present invention is to reduce the frictional force of a shift guide portion generated by a flexible board connecting a fixed portion and a shift movable portion and to achieve a lens capable of exhibiting excellent blur correction performance. It is intended to provide a lens barrel.

[0006]

In order to achieve the above object, the present invention comprises a plurality of lens units, and some of the lens units are moved in parallel on a plane perpendicular to the optical axis. In the lens barrel having the configured shift movable portion, the mounting portion of the flexible substrate connected between the fixed portion of the lens barrel and the shift movable portion on the shift movable portion side has a degree of freedom of movement. It is a lens barrel characterized by having it.

According to the above arrangement, the flexible board connected between the fixed part and the shift movable part has a degree of freedom of rotation or a degree of freedom of linear movement in the optical axis direction in the mounting part on the shift movable part side. When the shift movable portion is an optical system for blur correction, a smaller blur correction drive can be performed by reducing the force generated in the optical axis direction by the flexible substrate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 and FIG. 2 are views according to a first embodiment of the present invention. More specifically, FIG. 1 is an exploded view of a lens barrel having a four-unit (convex / convex / convex / convex) variable power optical system. FIG. 2 is a perspective view, and FIG. 2 is a sectional view of a main part of the lens barrel of FIG.

In these figures, L1 is a fixed first lens group, L2 is a second lens group that performs a magnification operation by moving in the optical axis direction, and L3 is moved in a plane perpendicular to the optical axis. A third lens unit L4 that performs a blur correction operation is a fourth lens unit that performs a focusing operation by moving in the optical axis direction.

Reference numeral 1 denotes a fixed lens barrel that holds the first lens unit L1, 2 denotes a moving frame that holds the second lens unit L2, and 3 denotes a third frame.
A shift unit 4 for moving the lens group L3 in a plane perpendicular to the optical axis, a moving frame 4 for holding the fourth lens group L4, and a rear barrel 5 on which an image pickup device such as a CCD is mounted. Reference numerals 6 and 7 denote two guide bars positioned and fixed by the fixed lens barrel 1 and the rear lens barrel 5, and the movable frames 2 and 4 can be moved in the optical axis direction by the guide bars 6 and 7. It is supported by. The shift unit 3 is positioned and sandwiched between the fixed lens barrel 1 and the rear lens barrel 5,
It is screwed and fixed from the rear with three screws.

Reference numeral 8 denotes a stop device for changing the aperture diameter of the optical system. A so-called guillotine-type stop device for moving the two aperture blades in opposite directions to change the aperture diameter.
Is a focus motor which is a driving means for moving the fourth lens unit L4 in the direction of the optical axis to perform a focusing operation, and a rack in which a lead screw 9a coaxial with the rotating rotor is attached to the moving frame 4. 4a, and the fourth lens unit L4 is moved by the rotation of the rotor. The play of the moving frame 4, the guide bars 6, 7, the rack 4a, and the lead screw 9a is offset by the torsion coil spring 4b. Numeral 10 denotes a zoom motor which is a driving means for moving the second lens unit L2 in the direction of the optical axis to perform a zooming operation. A lead screw 10a coaxial with the rotating rotor is mounted on the moving frame 2. The second lens group L2 is engaged with the rack 2a and is moved by rotation of the rotor. In addition, the torsion coil spring 2
At b, the play of each of the moving frame 2, the guide bars 6 and 7, the rack 2a, and the lead screw 10a is offset.
The focus motor 9 is fixed to the rear barrel 5 and the zoom motor 10 is fixed to the fixed barrel 1 with two screws.

Reference numeral 11 denotes a photo interrupter, which electrically detects switching of light shielding and light transmission due to movement of the light shielding portion 4c formed on the moving frame 4 in the optical axis direction, and serves as a reference for the fourth lens unit L4. This is a focus reset switch for detecting a position. 12 is a photo interrupter,
As a zoom reset switch for electrically detecting switching of light shielding and light transmission due to movement of the light shielding portion 2c formed in the moving frame 2 in the optical axis direction and detecting the reference position of the second lens unit L2. Function.

Next, the structure of the shift unit 3 that enables the third lens unit L3 to move within a plane perpendicular to the optical axis will be described with reference to FIGS. FIG. 3 shows FIG.
FIG. 4 is an exploded perspective view of the shift unit 3 viewed from the same direction as FIG.
Is an exploded perspective view of the shift unit 3 as seen from behind.

The third lens unit L3 has a pitch (Picct).
The optical axis extends in the vertical direction for correcting image blur in the direction (angle change in the vertical direction of the camera) and in the horizontal direction for correcting image blur in the yaw (Yaw) direction (angle change in the horizontal direction of the camera). While being regulated by the guide mechanism in a plane perpendicular to the optical axis, the drive is independently controlled by a dedicated drive unit and a position detection unit in each of the vertical and horizontal directions, and is positioned at an arbitrary position around the optical axis. Since the driving means and the position detecting means in the vertical and horizontal directions have the same configuration at an angle of 90 degrees, only the vertical direction (represented in the sectional view of FIG. 2) will be described.
Also, the numbers indicating the parts in the drawing are expressed by adding a subscript of P to the components in the vertical direction, and the subscripts of Y to the components in the horizontal direction.

Reference numeral 13 denotes a shift base, which is a component in front of the optical axis direction, which serves as a base of a fixed portion of the shift unit. Reference numeral 14 denotes roll prevention for preventing the shift lens group from rotating around the optical axis. It is a plate, 2 in front of the optical axis direction.
The two pins 14a and 14b are integrally formed, two long holes 14c and 14d are formed in the rear side in the optical axis direction in the same direction, and a line connecting the two pins 14a and 14b It forms an angle of 90 degrees with the direction line in which the long holes 14c and 14d are formed.

The two pins 14a and 14b are respectively fitted into elongated holes 13d and 13e formed in the shift base 13, and the roll prevention plate 14 is a plane perpendicular to the optical axis with respect to the shift base 13. Inside, it can be slid only in an angle direction of 45 degrees with respect to the horizontal. Reference numeral 15 denotes a shift lens barrel that holds a third lens group L3, which is a lens group that shifts.
4, two pins 15d and 15e are integrally formed at positions corresponding to the two long holes 14c and 14d, respectively. The two pins 15d and 15e are fitted into the long holes 14c and 14d, respectively. Therefore, the shift barrel 15 can move with respect to the roll prevention plate 14 only in the directions of the two long holes 14c and 14d of the roll prevention plate 14.

The roll prevention plate 14 is provided with a shift base 13.
Can be moved in only one direction with respect to the shift barrel 1
5 can be moved only with respect to the roll prevention plate 14 at an angle of 90 degrees with respect to the direction in which the roll prevention plate 14 can move with respect to the shift base. It can move in a plane perpendicular to the optical axis without moving.

Reference numerals 16a, 16b, and 16c denote three metal pins, and holes 15 formed in the shift barrel 15 in the radial direction.
a, 15b, and 15c are press-fitted as shown in FIGS. Reference numeral 17 denotes a sensor base, which is a component behind the optical axis. The sensor base 17 has three foot portions 17a, 17b, and 17c projecting radially and forward of the optical axis, and a flat surface on the optical axis front side is a regulating surface on the rear side of the shift barrel 15. Becomes Also, shift base 1
3 includes three feet 17a, 1 of the sensor base 17;
Pins 16a, 16b, 1 are located at positions facing 7b, 17c.
Three planes 13a, 13b and 13c are formed on the front side of the shift barrel 15 with the 6c interposed therebetween. The relationship between the three components will be further described with reference to FIG.

FIG. 5 is a view of the pins 16a, 16b and 16c as seen from the press-fitting direction.

The feet 17a, 17b,
17c, the front plane is abutted against the planes 13f, 13g, 13h formed on the shift base 13, respectively, and constitutes the rear regulating surface of the shift barrel 15. Further, the planes 13f, 13g, and 13h correspond to the planes 13a, 1
The steps are set so that there is a slight gap with respect to 3b and 13c so that the pins 16a, 16b and 16c can slide. The sensor base 17 includes the feet 17a, 17
b, 17c are planes 13f, 13g of the shift base 13,
It is connected to the shift base 13 with two screws so as to be surely abutted against the shift base 13h.

Next, the driving means and the position detecting means will be described.

2 to 4, reference numeral 18P denotes a driving magnet which is magnetized in two poles in a radial direction with respect to the optical axis, 19P denotes a yoke for closing a magnetic flux on the front side in the optical axis direction of the driving magnet 18P, 20P is a coil fixed to the shift barrel 15 by bonding, 21 is a yoke for closing the magnetic flux behind the driving magnet 18P in the optical axis direction, and forms a space in which the coil 20P moves with the driving magnet 18P. Shift base 13
Are fixed by the magnetic force of a magnet to form a magnetic circuit.
When a current is applied to the coil, a so-called Lorentz force is generated in a radial direction with respect to the optical axis, and the shift barrel 15 is moved.

Reference numeral 22P denotes a detection magnet polarized in two poles in a radial direction with respect to the optical axis, 23P denotes a yoke for closing a magnetic flux on the front side of the detection magnet 22P in the optical axis direction, and both are shift barrels. 15 fixed. Reference numeral 24 denotes a Hall element for converting a magnetic flux density into an electric signal, which is positioned and fixed to the sensor base 17. The above structure constitutes a position detecting means.

Here, the state of the magnetic flux on the rear side in the optical axis direction of the detection magnet 22P will be described with reference to FIG.

In FIG. 6, the horizontal axis is the position in the radial direction with respect to the optical axis, and the vertical axis is the magnetic flux density. The center of the horizontal axis is the boundary between the two-pole magnetization of the detection magnet 22P, and the magnetic flux density becomes zero at this time. This also corresponds to a position where the optical axis of the third lens unit L3 substantially matches the other lens units. Within the range shown by the two-dot chain line, the magnetic flux density changes linearly to such an extent that there is no practical problem. By detecting the change in the magnetic flux density as an electric signal from the Hall element 24P by appropriate signal processing, the position of the third lens unit L3 can be detected.

FIG. 7 shows an example of a signal processing circuit of the Hall element 24P.

24 (24P, 24Y) is a Hall element,
The 0 operational amplifier is combined with the resistors 40a, 40b, and 40c to supply a constant current to the Hall element 24. The output corresponding to the magnetic flux density of the Hall element 24 is differentially amplified by the operational amplifier 41 and the resistors 41a, 41b, 41c and 41d. The resistor 41e is a variable resistor, and it is possible to shift the electric output signal with respect to the magnetic flux density by changing the resistance value, and the optical axis of the third lens unit L3 matches the optical axis of the other lens unit. Output at the reference potential V
It is adjusted to be equal to c. The operational amplifier 42, in combination with the resistors 42a and 42b, inverts and amplifies the output of the operational amplifier 41 with respect to the reference potential Vc, and
, The ratio of the change in the output voltage to the change in the magnetic flux density can be adjusted to a predetermined value.

Next, the biasing of the shift movable portion in the optical axis direction will be described with reference to FIG.

FIG. 10 is a partially omitted illustration of the driving means and the position detecting means of FIG. The closed line A represents one magnetic field line as a representative example of the magnetic flux generated by the detection magnet 22P. The magnetic flux is closed in the direction of the arrow, and acts as a signal for position detection on the rear side in the optical axis direction of the detection magnet 22P, as shown in FIG. 6, and as shown in the figure on the front side in the optical axis direction of the detection magnet 22P. It passes through the yoke 21 and is closed. In short, the magnetic flux on the front side in the optical axis direction of the detection magnet 22P is not completely closed by the yoke 23P, but is intentionally leaked to the front side to be magnetically coupled to the yoke 21 so that the shift movable portion is moved in the direction of the arrow B. It is biased toward the front of the shaft. Since the yaw direction has the same configuration, a stable urging force is generated by the combined force.

Returning to FIGS. 2, 3 and 4, the description will be continued.

Reference numeral 25 denotes a coil 20P and a Hall element 24P.
Is a flexible substrate having flexibility to electrically connect to an external circuit, and is folded in two at 25a (in FIG. 4, it is divided into two parts at 25a),
A Hall element 24P is mounted on the front side of the 26P portion in the optical axis direction. In addition, the folded portion further bends at three places, and the tip portion 27P fits a hole 28P formed in a part thereof into a pin 29P formed in the shift barrel 15 so as to be rotatable around the pin. Both terminals of the coil 20P are fixed to the land portions 30P and 31P provided on the 27P, respectively. Reference numeral 32 denotes a pressing plate for fixing the flexible substrate 25 to the sensor base 17, and is fixed to the sensor base 17 by one screw.

Next, referring to FIGS. 8 (a) and 8 (b), a connection portion for absorbing the movement between the sensor base 17 as the fixed portion of the flexible substrate 25 and the shift barrel 15 as the movable portion will be described in more detail. explain.

FIG. 8A shows the shape before bending. The hole fixed to the sensor base 17 has a hole 33P and a long hole 34P.
Are arranged in the longitudinal direction. The sensor base 17 has pins formed in portions corresponding to the holes 33P and the elongated holes 34P, respectively.
, The direction of the protrusion from the fixed portion is determined by the elongated hole 34P. The bent portion between 33P and 34P is pressed by the sensor base 17 by the pressing plate 32. The 35P portion and the 37P portion are bent at the bent portion 36P and form an angle of about 90 degrees. The vertical and horizontal movements of the shift barrel 15 are absorbed by the surface longitudinal bending of 35P and 37P.

The distal end portion 27P of the flexible board 25 has the hole 28P fitted into the pin 29P (see FIGS. 3 and 4) of the shift barrel 15 as described above.
9P is a stepped pin, and 27P has a shape that does not come off. In addition, 27P is the projection 38P
And the 39P portion is fitted under a flat formed at a certain interval with the receiving surface of the shift barrel 15 so that the portion does not come off with a degree of freedom of rotation around the pin 29P within a certain range. I have.

When the bent portion 36P is bent at an angle of exactly 90 degrees (see FIG. 8) with respect to the longitudinal direction, the hole 28P of the tip portion 27P comes to the position of the pin 29P. 35P portion of flexible substrate 25 and 37
Unnatural deformation does not occur in the P portion, but when the bent portion 36P is bent from 90 degrees with respect to the longitudinal direction,
The position of the hole 28P of the tip portion 27P and the position of the pin 29P are shifted by an amount corresponding to the inclination of the bend in the optical axis direction.
At this time, since the tip portion 27P can be rotated by the amount of the bending deviation, the torsion of the 35P portion and the 37P portion causes the bending portion 3P to rotate.
6P bending displacement can be absorbed. If 27
If the P portion cannot be rotated, if there is a deviation in the bending of the 36P portion, bending in the longitudinal direction (arrows C and D in FIG. 8B) that does not bend easily at the 35P portion and the 37P portion will act, thereby causing the shift mirror. The cylinder 15 is strongly pressed down in the optical axis direction, causing a problem that the movement of the movable portion is deteriorated due to an increase in friction of the sliding portion.

Further, even if the pressing direction of the pressing plate 32 at the connecting portion of the fixed portion with the sensor base 17 is shifted and the protruding direction of the flexible board is slightly shifted, the hole 2 with respect to the pin 29P is not removed.
Since the position of 8P is shifted in the optical axis direction, the rotation force of 27P reduces the force generated by the flexible substrate 25 in the optical axis direction. As another configuration example, as shown in FIG. 11, a long hole in the optical axis direction as shown by 28P 'with respect to the pin 29P also reduces the force generated in the optical axis direction by the flexible substrate.

FIG. 9 is a system configuration diagram as a camera shake correction lens.

In the lens barrel shown in FIG. 2, reference numeral 50 denotes an optical low-pass filter for removing a high frequency component of the spatial frequency of the object, and reference numeral 51 denotes an optical signal for converting an optical image disposed on the focal plane into an electric signal. A CCD which is an image sensor;
The electric signal “a” read from the signal 51 becomes an image signal by the camera signal processing circuit 52.

Reference numeral 53 denotes a microcomputer for controlling lens driving. When the power is turned on, the microcomputer 53 rotates the respective stepping motors by the focus motor drive circuit 56 and the zoom motor drive circuit 57 while monitoring the outputs of the focus reset circuit 54 and the zoom reset circuit 55, and thereby the moving frame 2 and the moving frame 4 is moved in the optical axis direction.

The outputs of the focus reset circuit 54 and the zoom reset circuit 55 reach their respective moving frames to a preset position (a light shielding member provided on the moving frame shields a light emitting portion of a photo interrupter provided on a fixed portion from light). The microcomputer 53 knows the absolute position of each lens group by counting the number of subsequent drive steps of the stepping motor in the microcomputer with reference to that position. I can do it. Thereby, accurate focal length information can be obtained. Reference numeral 58 denotes an aperture drive circuit for driving the aperture device 8, and the microcomputer 5
The aperture diameter of the aperture is controlled based on the brightness information b of the video signal captured in the block 3.

Reference numerals 59 and 60 denote a pitch (vertical tilt angle) and yaw (horizontal tilt angle) angle detection circuits of the optical device. The angle is detected by, for example, an angular velocity sensor such as a vibration gyro fixed to the optical device. This is done by integrating the output of The outputs of both circuits 59 and 60, that is, information on the tilt angle of the optical device are taken into the microcomputer 53. Reference numerals 61 and 62 denote pitch (vertical) and yaw (horizontal) coil drive circuits for moving the third lens unit L3 perpendicular to the optical axis in order to perform camera shake correction, and a magnetic circuit including a magnet. And a driving force for shifting the third lens unit L3 is generated by a so-called moving coil configuration.

Reference numerals 63 and 64 denote pitch (longitudinal) and yaw (horizontal) position detecting circuits for detecting the amount of shift of the third lens unit L3 with respect to the optical axis. When the third lens unit L3 moves perpendicular to the optical axis, the passing light beam is bent, and the position of the image of the subject formed on the CCD 51 moves. The amount of movement of the image at this time is controlled by the microcomputer 53 so as to move by the same size in the direction opposite to the direction in which the image moves due to the actual tilt of the optical device. (Even), so-called image stabilization can be realized in which the formed image does not move.

In the microcomputer 53, the tilt signal of the optical device obtained by the pitch angle detection circuit 59 and the yaw angle detection circuit 60 and the third lens group L3 obtained by the pitch position detection circuit 63 and the yaw position detection circuit 64 Are subtracted from each other, and the difference signal is amplified and the phase is compensated.
The shift barrel 15 is driven by the 1 and yaw coil drive circuits 62, respectively. With this control, the positioning of the third lens unit L3 is controlled so that the difference signal becomes smaller, and the target position is maintained. Further, in the present embodiment, since the third lens unit L3 for shifting vertically to the optical axis is closer to the imaging surface than the second lens unit L2 for zooming, the image of the third lens unit L3 is shifted with respect to the shift amount. The movement amount is the second for zooming.
The shift amount of the third lens unit L3 is not directly determined by the tilt signal of the optical device obtained by the pitch angle detection circuit 59 and the yaw angle detection circuit 60 because the position of the lens unit L2 changes depending on the position of the lens unit L2, ie, the focal length. The correction is performed based on the position information of the second lens unit L2, and the movement of the image due to the inclination of the optical device is canceled by the shift of the third lens unit L3.

In this embodiment, the sliding between the front and rear regulating surfaces formed by the shift base 13 and the sensor base 17 is emphasized with emphasis on the slidability of the movable shift barrel 15 at the guide portion. The moving part is a metal pin 16a, 16b, 16c that is radially press-fitted into the shift barrel 15, but in the case of an optical configuration in which the amount of movement on the image plane relative to the amount of shift of the lens group to be shifted is small. Even if the mobility is slightly worse, it is possible to secure the correction ability on the screen,
By molding the pin 16 integrally with the shift barrel 15,
The pin can be eliminated, and the die slide for forming the press-fit hole of the pin of the shift barrel 15 is not required. Further, the third lens unit L3 positioned and fixed to the shift barrel 15
Since the surface that slides between the positioning surface in the optical axis direction and the front and rear regulating surfaces can be formed by a mold from the same direction, it is possible to further improve the accuracy of the inclination of the third lens group.

Although the above is an explanation of the embodiment, the present invention is not limited to the configuration of the above-mentioned embodiment, and may have any configuration as shown in the claims. Needless to say.

According to the above-described embodiment, in a lens barrel which is composed of a plurality of lens units, some of which are moved in parallel in a plane perpendicular to the optical axis. The mounting portion (the distal end portion 27P in FIGS. 8 and 11) of the flexible substrate 25, which is connected between the sensor base 17 as a movable portion and the shift barrel 15 (including L3) as a movable portion, on the shift barrel 15 side. (27Y)) has a degree of freedom of movement, specifically, a degree of freedom of rotation as shown in FIG. 8 or a degree of freedom of linear movement in the optical axis direction as shown in FIG. With the reduction, the frictional force of the shift guide portion is reduced, and it is possible to finely control the drive of the shift movable portion.

[0048]

As described above, according to the present invention,
An object of the present invention is to provide a lens barrel capable of reducing frictional force of a shift guide portion generated by a flexible substrate connecting a fixed portion and a shift movable portion and exhibiting excellent blur correction performance.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a lens barrel according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the lens barrel of FIG.

FIG. 3 is an exploded perspective view of the shift unit according to the embodiment of the present invention.

FIG. 4 is an exploded perspective view of the shift unit according to the embodiment of the present invention.

FIG. 5 is a diagram for explaining a configuration of front and rear regulating surfaces in the embodiment of the present invention.

FIG. 6 is a diagram for describing a detection magnet in the embodiment of the present invention.

FIG. 7 is a circuit diagram illustrating an example of a signal processing circuit of a Hall element in the embodiment of the present invention.

FIG. 8 is an explanatory diagram of a connection portion of a flexible substrate in the embodiment of the present invention.

FIG. 9 is a system configuration diagram as a camera shake correction lens according to the embodiment of the present invention.

FIG. 10 is a diagram for explaining biasing of the shift movable portion in the optical axis direction in the embodiment of the present invention.

FIG. 11 is an explanatory diagram of another configuration example of the connection portion of the flexible substrate shown in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed lens barrel 2, 4 Moving frame 3 Shift unit 6, 7 Guide bar 13 Shift base 14 Roll prevention plate 15 Shift lens barrel 18 Driving magnet 22 Detection magnet 24 Hall element 25 Flexible board 27P Tip part 27Y Tip part L3 3 lens groups

Claims (5)

[Claims] 1. A lens barrel having a plurality of lens groups, and having a shift movable section configured to move a part of the lens groups in a plane perpendicular to an optical axis in parallel. A lens barrel characterized in that a flexible substrate connected between a fixed portion of a cylinder and the shift movable portion has a degree of freedom of movement in a mounting portion on the shift movable portion side of the flexible substrate. 2. The lens barrel according to claim 1, wherein the mounting portion on the shift movable portion side has a degree of freedom of rotation. 3. The lens barrel according to claim 1, wherein the mounting portion on the shift movable portion side has a degree of freedom of linear movement in an optical axis direction. 4. The lens mirror according to claim 1, wherein the shift movable portion is a lens group that translates in a plane perpendicular to the optical axis and a holding member thereof. Tube. 5. The lens barrel according to claim 1, wherein the shift movable section is an optical system for correcting image blur caused by vibration applied to the lens barrel. .