JP4603833B2 - LENS DEVICE AND IMAGING DEVICE - Google Patents

Description

  The present invention relates to a lens apparatus and an imaging apparatus, and more particularly to a lens holding structure.

  2. Description of the Related Art Conventionally, a lens barrel that has a photographing optical system composed of a plurality of lens units and moves the lens unit in the optical axis direction using a cam ring has been proposed as a technique for downsizing the lens barrel. .

In Patent Document 1, the first cam groove with the largest pressure angle and the second cam groove with the smallest pressure angle are arranged in the cam cylinder at substantially the same position in the circumferential direction and shifted in the optical axis direction. By disposing the third cam groove whose pressure angle is intermediate between both cam grooves at a position shifted in the circumferential direction with respect to the first and second cam grooves, the axial length of the cam cylinder is increased. The lens barrel is miniaturized by shortening the length.
JP 10-073752 A (paragraph 0023, FIG. 6 etc.)

  However, in Patent Document 1, since the cam follower engaged with the cam groove is also engaged with the rectilinear groove, the lens unit is rattled in the direction perpendicular to the optical axis, and the positional accuracy is lowered. Have problems.

  If the pressure angle of the cam groove that drives the three lens units is large, small, or intermediate, the cam grooves can be arranged so that they do not overlap. If there is a large change or the direction of movement changes, the cam groove cannot be stacked and the cam ring becomes larger, the lens barrel becomes larger, and the degree of freedom in design is reduced. Have a problem.

  One exemplary object of the present invention is to realize a lens device that prevents the lens unit from rattling and improves the positional accuracy.

The lens device of the present invention includes a first member having a first engagement portion and a second engagement portion, and a second member having a first cam portion to which the first engagement portion engages. And a third member having a rectilinear guide portion for guiding the second engaging portion in the optical axis direction, and the first member and the second member are rotated by relative rotation between the first member and the second member. A lens device in which a member moves in an optical axis direction with respect to the second and third members, wherein the second engaging portion is provided at three locations in the circumferential direction of the first member, 1 is provided at two locations in the circumferential direction of the first member, the second member has a second cam portion, and the first member is the second engagement. A third engaging portion at a position away from the optical axis direction, and the lens device has a fourth member driven in the optical axis direction by the second cam portion. , The fourth member, wherein the third engagement portion is positioned in a direction orthogonal to the optical axis by the third the third has a cam portion of the engaging portion for engagement.

  According to the present invention, rattling between the second engaging portion and the rectilinear guide portion is prevented, and the positional accuracy of the first member due to the engagement with the rectilinear guide portion is improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 13 show the configuration of a lens barrel (lens device) that is Embodiment 1 of the present invention. The lens barrel of the present embodiment has a variable magnification optical system having a so-called four-lens unit configuration, and when not in use, the interval between the lens units is reduced with respect to the time of use and retracted with respect to a camera body (not shown). This is a type of lens barrel.

  1A is an exploded perspective view of the lens barrel, FIG. 1B is a cross-sectional view of the main part of the lens barrel, FIG. 2 is a cross-sectional view of the lens barrel when retracted, and FIG. 3 is the widest angle of the lens barrel (WIDE end). FIG. 4 is a cross-sectional view of the lens barrel at the telephoto end (TELE end). 5 is a cross-sectional view of the first lens barrel unit, FIG. 6 is a perspective view of the first lens barrel unit 1 cut out from a part thereof, and FIG. 7 is a perspective view of the first lens barrel unit 1. FIG. 8 is a perspective view when the first lens barrel unit 1 is bonded, FIG. 9 is a perspective view showing a sleeve portion of an aperture shutter, and FIG. 10 is a sleeve of the shift unit. It is a perspective view showing a part. Further, FIG. 11 is a sectional view showing a movable (curved) wiring board, FIG. 12 is an outer cam development view of the cam ring, and FIG. 13 is an inner cam development view of the cam ring.

In these drawings, in order from the front side (object side), L1 is a first lens unit (second lens) , L2 is a second lens unit (first lens) , and L3 is moved in a plane orthogonal to the optical axis. A third lens unit L4 that performs image blur correction, and a fourth lens unit L4 that moves in the optical axis direction to perform focusing.

  Reference numeral 1 denotes a first lens barrel unit (fourth member) that holds the first lens unit L1, 2 denotes a second lens barrel unit (first member) that holds the second lens unit L2, and 3 denotes a third lens unit. A shift unit that holds the lens unit L3 so as to be movable in a plane orthogonal to the optical axis, 4 is a moving frame that holds the fourth lens unit L4, and 5 is an aperture shutter unit that adjusts the amount of light.

  6 is a cam pin having a conical cam follower fixed to the rear end portion of the shift unit 3 by press-fitting or the like, and 7 is a cam pin having a conical cam follower fixed to the rear end portion of the aperture shutter unit 5 by press-fitting or the like. It is.

  Reference numerals 8, 9, and 10 are guide bars that support the shift unit 3, the moving frame 4, and the aperture shutter unit 5 so as to be movable in the optical axis direction. The shift unit 3 is supported by guide bars 8 and 9, the moving frame 4 is supported by guide bars 10 and 9, and the aperture shutter unit 5 is supported by guide bars 9 and 10, respectively.

  Reference numeral 11 denotes a rear barrel in which rear end portions of the guide bars 8, 9, 10 are positioned and fixed, and an image pickup device 51 (see FIG. 14) such as a CCD sensor or a CMOS sensor is attached.

Reference numeral 12 denotes a fixed cylinder (third member) for positioning and fixing the front end portions of the guide bars 8, 9, and 10, and is fixed to the rear lens barrel 11 with screws.

  A cam barrel (second member) 13 is positioned by the rear barrel 11 in the optical axis direction and is rotatably held on the outer periphery of the fixed barrel 12. The cam cylinder 13 has a first cam groove portion (second cam portion) 13a for driving the first lens unit L1 in the optical axis direction and an impact-resistant cam groove portion 13b for impact receiving on the outer peripheral surface thereof. Further, on the inner peripheral surface, a second cam groove portion (first cam portion) 13c for driving the second lens unit L2 in the optical axis direction and a third cam for driving the third lens unit L3 in the optical axis direction are provided. 3 cam groove 13d and shutter cam groove 13e for driving the aperture shutter unit 5 in the optical axis direction.

  Cam follower pins provided integrally with the lens barrels, which will be described later, are engaged with these cam grooves, and the cam barrel 13 rotates about the optical axis with respect to the fixed barrel 12 so that the first The second and third lens units L1, L2, and L3 and the aperture shutter unit 5 are moved forward and backward in the optical axis direction to perform a zooming operation and a collapsing / projecting operation.

Reference numeral 14 denotes a support frame fixed to the rear barrel 11 with screws. Reference numeral 15 denotes a focus motor that drives the fourth lens unit L4 in the optical axis direction to perform a focusing operation. In the focus motor 15, a lead screw 15 a coaxial with the rotor meshes with a rack 35 attached to the moving frame 4. For this reason, the fourth lens unit L4 can be driven by the rotation of the rotor. Further, the moving frame 4, the guide bars 9, 10, the rack 35 and the lead screw 15a are offset by a torsion coil spring (not shown), thereby eliminating backlash between the members. The focus motor 15 is fixed to the support frame 14 with screws.

  Reference numeral 16 denotes a zoom motor that rotationally drives the cam cylinder 13, which meshes with a gear portion 13f provided at the rear end portion of the cam cylinder 13 to rotate the cam cylinder 13 to perform a zooming operation. The zoom motor 16 is fixed to the rear barrel 11 with screws.

  Reference numeral 17 denotes a focus reset switch composed of a photo interrupter, which detects switching between a light shielding state and a light transmitting state due to movement of the light shielding portion 4c formed in the moving frame 4 in the optical axis direction. Thereby, the reference position of the fourth lens unit L4 can be detected.

  Reference numerals 18 and 19 denote zoom reset switches made of photo interrupters, which detect switching between the light shielding state and the light transmitting state due to the rotational movement of the light shielding portion 13g formed at the rear end portion of the cam barrel 13. Thereby, a plurality of reference positions of the cam cylinder 13 can be detected.

  Reference numeral 20 denotes a wiring board connected to the photo interrupters 18 and 19, which is connected to a camera circuit (not shown) via a connector portion 20a.

Reference numeral 33 denotes a shift unit wiring board that connects the shift unit 3 and the wiring board 20, and has a movable portion 33a. Reference numeral 34 denotes an aperture shutter unit wiring board that connects the aperture shutter unit 5 and the wiring board 20, and has a movable portion 34a.

  Reference numeral 21 denotes a wiring board connected to the focus motor 15 and the photo interrupter 17, and is also connected to the wiring board 20. Reference numeral 22 denotes an outer cylinder fixed to the rear barrel 11.

  Next, the support structure for the first and second lens units will be described. At the tip of the fixed cylinder 12, three keys 12a are provided at equal angular positions around the optical axis (circumferential direction). Three rectilinear grooves 1a that respectively engage with the three keys 12a are provided on the inner peripheral surface of the cylindrical portion of the first lens barrel unit 1. The three keys 12a and the three rectilinear grooves 1a With this engagement, the first lens barrel unit 1 is positioned in the direction perpendicular to the optical axis with respect to the fixed tube 12.

  The first lens barrel unit 1 is guided in the optical axis direction by the rectilinear groove 1a. Three cam follower pins 1b and three impact resistant pins 1c are attached to the rear end portion of the first barrel unit 1 at equal angular positions. The cam follower pin 1b is engaged with three first cam grooves 13a provided on the outer peripheral surface of the cam cylinder 13, and the impact resistant pin 1c is engaged with the impact resistant cam groove 13b. The cam follower pin 1b and the impact resistant pin 1c engage with each cam groove portion, thereby preventing the first lens barrel unit 1 from falling down and rotating the cam tube 13 so that the cam follower pin 1b becomes the first cam groove portion. The first lens barrel unit 1 is advanced and retracted in the direction of the optical axis by receiving a force from 13a.

  The cam follower pin 1b is a taper pin that is always engaged with the first cam groove 13a, and the impact resistant pin 1c is a taper pin having an angle close to a substantially cylindrical shape. The impact resistant pin 1c is in a position corresponding to the impact resistant cam groove 13b, but is not normally engaged with the impact resistant cam groove 13b. When a shocking force is applied to the first barrel unit 1 due to dropping or the like, the cam follower pin 1b rises along the tapered surface of the first cam groove 13a and is likely to fall off from the first cam groove 13a. In this state, the impact resistant pin 1c is engaged (contacted) with the impact resistant cam groove portion 13b, thereby preventing the cam follower pin 1b from falling off from the first cam groove portion 13b.

  At the rear end portion of the second lens barrel unit 2, three cylindrical pins (second engaging portions) 23 functioning as linear keys are provided at equal angular positions in the circumferential direction. Further, two cam follower pins (first engagement portions) 24 are provided at the rear end portion of the second lens barrel 2 at equal angular positions in the circumferential direction. Each cylindrical pin 23 has a shaft portion at the base thereof, and the shaft portion is press-fitted into the second barrel unit 2. Further, the cam follower pin 24 has a shaft portion at the base thereof, and the shaft portion is inserted into the hole portion of the second barrel unit 2 and is biased in a direction to engage with the second cam groove portion 13c by the leaf spring 25. Has been.

  The fixed barrel 12 is formed with three rectilinear grooves (straight guide sections) 12b, and the second barrel unit 2 is fixed by the engagement of the three cylindrical pins 23 and the three rectilinear grooves 12b. The cylinder 12 is positioned in the direction orthogonal to the optical axis. The second lens barrel unit 2 is guided in the optical axis direction along the rectilinear groove portion 12b.

  Three keys (third engagement portions) 2a are provided at the tip end portion of the second barrel unit 2 at equal angular positions in the circumferential direction. These keys 2 a engage with the three rectilinear grooves 1 a formed on the inner peripheral surface of the cylindrical portion of the first lens barrel unit 1, so that the second lens barrel unit 2 is in relation to the first lens barrel unit 1. The tip side is positioned in the direction perpendicular to the optical axis.

  As described above, the second barrel unit 2 is prevented from being tilted with respect to the optical axis by the fixed barrel 12 and the first barrel unit 1. For this reason, when the first lens barrel unit 1 moves in the direction perpendicular to the optical axis due to the backlash of the support / guide portion or the unevenness of the three first cam groove portions 13a, the distal end side of the second lens barrel unit 2 It moves following it. As a result, the relative positional deviation between the second lens unit L2 and the first lens unit L1 can be minimized.

  The cam follower pin 24 always engages with the two second cam groove portions 13c provided on the inner peripheral surface of the cam tube 13, and receives the force from the second cam groove portion 13c by the rotation of the cam tube 13 and receives the second force. The lens barrel unit 2 is advanced and retracted in the optical axis direction. The position of the second lens barrel unit 2 in the direction perpendicular to the optical axis is determined with high accuracy by the engagement of the three cylindrical pins 23 and the rectilinear grooves 12b. Further, the driving of the second lens barrel unit 2 in the optical axis direction is performed via two cam follower pins 24 that are offset to the second cam groove portion 13c by the leaf spring 25, so that the second lens barrel unit 2 is driven. 2 can be driven with high accuracy without causing the inclination of 2 (see FIG. 1B).

  Moreover, the rotation angle of the cam cylinder 13 can be increased by using two second cam groove portions 13c. In the present embodiment, the cylindrical pin 23 that engages with the rectilinear groove portion 12b is a separate member from the second barrel unit 2, but the cylindrical pin 23 may be integrally formed with the second barrel unit 2. .

  In this manner, the cam follower pin 24 that engages with the second cam groove portion 13c provided in the cam cylinder 13 and the cylindrical pin 23 that is guided by the rectilinear groove portion 12b provided in the fixed cylinder 12 are configured separately. Therefore, the cylindrical pin 23 can be press-fitted and integrally formed with the second barrel unit 2 without play, and the positional accuracy of the second barrel unit 2 by the engagement with the rectilinear groove portion 12b is improved.

  Further, the space between the cam follower pin 24 and the second cam groove 13c of the cam barrel 13 can be minimized, and deterioration of the position accuracy due to rattling of the second barrel unit 2 in that space can be prevented. it can.

  Next, a support structure for the shift unit 3, the moving frame 4, and the aperture shutter unit 5 will be described. Bars 8, 9, and 10 that support the shift unit 3, the moving frame 4, and the aperture shutter unit 5 so as to be movable in the optical axis direction are sandwiched between the rear barrel 11 and the fixed barrel 12, and are arranged with respect to the optical axis direction. It is supported substantially in parallel. The bar 9 is disposed on the opposite side of the bars 8 and 10 with the optical axis in between. The sleeve portion 3 a of the shift unit 3 is engaged with the bar 8 so as to be movable in the optical axis direction, and the cam follower 6 (see FIG. 10) provided in the shift unit 3 is a third cam of the cam cylinder 13. The groove 13d is engaged. For this reason, the shift unit 3 is driven in the optical axis direction by the rotation of the cam cylinder 13. The length of the bar 8 is at least the length obtained by adding the moving amount of the shift unit 3 to the length of the sleeve portion 3a.

  The sleeve portion 5a of the aperture shutter unit 5 is engaged with the bar 9 so as to be movable in the optical axis direction. Further, the U groove portion 3b provided in the shift unit 3 is engaged with the bar 9 inside the sleeve portion 5a of the aperture shutter unit 5 (see FIG. 9), and the U groove portion 3b provided in the moving frame 4 is engaged. The groove portion 4b is engaged with the bar 9 on the rear side of the sleeve portion 5a.

  The aperture shutter unit 5 is provided with a cam follower 7, and the cam follower 7 is engaged with a shutter cam groove 13 e of the cam cylinder 13. Thereby, the aperture shutter unit 5 is driven in the optical axis direction by the rotation of the cam cylinder 13. The length of the bar 9 is the length obtained by adding the moving amount of the aperture shutter unit 5 to the length of the sleeve portion 5a, and further adding the length of the U groove portion 4b and the moving amount of the moving frame 4 to this length. It is necessary at a minimum. However, since the U-groove portion 3b of the shift unit 3 is inside the sleeve portion 5a, the length required for the bar 9 can be made shorter than when the U-groove portion 3b is arranged on the front side or the rear side of the sleeve portion 5a. .

  Further, in the sleeve portion 5 a of the aperture shutter unit 5, there is a hole on the outer peripheral side of the bar 9, and the front and rear are connected at positions facing each other across the bar 9 in the circumferential direction of the bar 9. As described above, the sleeve portion 5a is not enlarged in the outer peripheral direction by making the hole in the outer peripheral side of the bar 9 in the sleeve portion 5a. Further, since the front and rear are connected at positions facing each other across the bar 9, the accuracy of the position and shape of the sleeve portion 5a is improved, and the strength is also increased.

  The sleeve 10a of the moving frame 4 is engaged with the bar 10 so as to be movable in the optical axis direction. Further, the U groove portion 5 b of the aperture shutter unit 5 is engaged with the bar 10. For this reason, the length of the bar 10 is required to be the minimum of the length of the sleeve portion 4a, the moving amount of the moving frame 4, the length of the U groove portion 5b, and the moving amount of the aperture shutter unit 5.

  Thus, by arranging the U-groove portion of the other moving member inside the sleeve portion, not only the number of bars can be reduced, but also the length of the bars can be shortened. As a result, the lens barrel The whole can be shortened. In the present embodiment, one U-groove portion is disposed inside the sleeve portion, but a plurality of U-groove portions may be disposed.

  In the present embodiment, in the cam cylinder 13, the one third cam groove portion 13 d is substantially corresponding to the circumferential region (phase region) where one of the two second cam groove portions 13 c is formed. And one shutter cam groove portion 13e is arranged in the phase region on the image pickup element side substantially corresponding to the phase region in which the other second cam groove portion 13c is formed.

  That is, the second and second shift units 3 and 5 (the other two members) are moved with respect to each of the plurality of second cam grooves 13c that move the second barrel unit 2 (one member). The shutter cam groove portions 13d and 13e are provided at positions different from the second cam groove portion 13c in the optical axis direction and in ranges different from each other in the rotation direction, and the circumferential phases of the second and shutter cam groove portions 13d and 13e are approximately set. Can be arranged together.

  Therefore, since the space on the cam barrel 13 can be used effectively, the degree of freedom in designing the lens barrel can be improved and the cam barrel 13 can be downsized.

  The shift unit wiring board 33 is disposed near the sleeve portion 3a of the shift unit 3 and is disposed at a position along the side surface of the imaging element. As a result, the shift unit wiring board 33 can be brought closer to the optical axis, and as a result, the fixed cylinder 12 can be made smaller, and the diameter of the entire lens barrel can be made smaller.

  Similarly, the aperture shutter unit wiring board 34 is disposed near the sleeve portion 5a of the aperture shutter unit 5 and disposed at a position along the side surface of the image sensor. As a result, the aperture shutter unit wiring board 34 can be brought closer to the optical axis, the fixed cylinder 12 can be made smaller, and the diameter of the entire lens barrel can be made smaller.

  Further, since the bar 9 is shared by the U groove portion 3b of the shift unit 3 and the sleeve portion 5a of the aperture shutter unit 5, the sleeve portion 3a of the shift unit 3 faces the U groove portion 3b across the optical axis. By arranging at the position where the shift unit 3 is positioned, the position holding accuracy of the shift unit 3 is improved. Further, the sleeve portion 3a of the shift unit is preferably arranged at a position facing the sleeve portion 5a of the aperture shutter unit 5 across the optical axis.

  Further, by disposing the movable wiring board near the sleeve portion, the moving member having the sleeve portion can be easily moved in the optical axis direction. For this reason, the shift unit 3 and the aperture shutter unit circuit board 34 and the aperture shutter unit circuit board 34 are disposed at positions facing each other across the optical axis and along the side surface of the image sensor. This facilitates the movement of the shutter unit 5 and contributes to a reduction in the diameter of the entire lens barrel.

  In the present embodiment, the two wiring boards 33 and 34 are arranged at positions facing each other, but these may be arranged along the side surface of the image pickup element, and an angle of 90 degrees with the optical axis as the center. You may arrange | position in the position made. In addition, the curved portion can be provided after connecting the two wiring boards 33 and 34 to one, but if the number is one, the width becomes wider, and the fixed cylinder 12 becomes larger even along the side surface of the imaging element. As a result, the diameter of the entire lens barrel increases, so that each wiring board is preferably independent.

  Next, the configuration of the first barrel unit 1 will be described with reference to FIGS. 1 and 5 to 8. FIG. 5 is a cross-sectional view of the first lens barrel unit 1, FIG. 6 is a perspective view of the first lens barrel unit 1 cut out from a diagonally front side, and FIG. 7 is a part of the first lens barrel unit 1. FIG. 8 is a perspective view showing a state when the first lens barrel unit 1 is bonded.

  Reference numeral 26 denotes a first lens barrel member that holds the first lens unit L1, and a fixing flange 26a is provided on the outer periphery thereof. On the outer periphery of the flange 26a, a plurality of bonding portions 26b each having a notch shape for bonding are formed over the entire circumference at a predetermined pitch in the circumferential direction. Further, a plurality of engaging portions 26c for engaging the adjustment tool are formed on the front end surface of the first lens barrel member 26 over the entire circumference at a predetermined pitch in the circumferential direction. Further, an abutting surface 26d is provided on the rear side of the flange 26a.

  Reference numeral 27 denotes a first guide cylinder in which three rectilinear grooves 1a are formed on the inner peripheral surface, and flanges 27a extending in the circumferential direction are formed in three circumferential phase regions in the front inner peripheral portion. The optical axis orthogonal surfaces (front surface 27b and rear surface 27c) before and after the flange 27a are changed by a predetermined amount in a stepped manner in the optical axis direction in the circumferential direction.

  The abutting surface 26d of the first lens barrel member 26 is in contact with one of the front surfaces 27b of the flanges 27a. Here, the circumferential pitch (interval) of the bonding portion 26b and the engaging portion 26c for the adjustment tool is substantially the same as the circumferential pitch of the stepped surface of the flange 27a.

Reference numeral 28 denotes a first lens barrel stopper plate, which is formed of an elastic member. Locking portions 28 a are provided at three locations in the circumferential direction of the first lens barrel stopper plate 28, and the locking portions 28 a are locked to protrusions 26 e provided on the first lens barrel member 26. Yes. The protrusion 28b is in contact with one of the rear surfaces 27c of the stepped flange 27a. For this reason, the first lens barrel member 26 is pulled back (biased) by the first lens barrel stopper plate 28 with respect to the flange 27a. Therefore, the abutting surface 26d of the first lens barrel member 26 is pressed against the front surface 27b of the flange 27a.

  Therefore, when the adjustment tool is engaged with the engaging portion 26c and the first lens barrel member 26 is rotated around the optical axis, the abutting surface 26d of the first lens barrel member 26 is pressed against the front surface 27b of the flange 27a. The position where the abutting surface 26d abuts on the front surface 27b is changed while maintaining the held state, and the first lens barrel member 26 in the first lens barrel unit 1, that is, the first lens unit L1 is changed. The position in the optical axis direction can be adjusted.

  At this time, the thickness in the optical axis direction of each step portion of the flange 27a is substantially the same, and even if the first lens barrel member 26 rotates and the contact position of the abutting surface 26d with the flange 27a changes, the first The urging force of the first lens barrel member 26 by the lens barrel stopper plate 28 is substantially constant.

  The first lens barrel member 26 is dimensioned to be slidable within a predetermined amount in the direction orthogonal to the optical axis with respect to the first guide tube 27. In other words, the height of the flange 27a in the direction perpendicular to the optical axis is set to a height that allows the eccentric adjustment of the first lens barrel member 26. The eccentricity of the first lens unit L1 can be adjusted in the first lens barrel unit 1 by sliding the abutting surface 26d in the direction orthogonal to the optical axis along the front surface 27b of the flange 27a.

  The four-unit variable magnification optical system included in the lens barrel of the present embodiment described above has a large variable magnification, and the requirements for the positional accuracy of each lens unit are particularly high. Thus, the first lens unit L1 can be adjusted in the optical axis direction and the optical axis vertical direction (eccentric direction).

  Then, the first lens barrel member 26 and the first guide tube 27 are bonded together by bonding portions 27d (see FIG. 8) provided at three locations in the circumferential direction after adjustment. As a result of the adjustment, the first lens barrel member 26 rotates relative to the first guide tube 27. As described above, the circumferential pitch of the adhesive portion 26b and the circumferential pitch of the stepped portion of the flange 27a are substantially equal. Even in this state, one of the plurality of adhesive portions 26b in the first lens barrel member 26 always faces each adhesive portion 27d of the first guide tube 27. Therefore, even if the first lens barrel member 26 is rotated for adjustment, it is not necessary to rotate the tool or machine for performing the bonding operation with respect to the first guide tube 27. In the present embodiment, the number of bonding locations is three, but it may be one or more.

  Further, the configuration of the lens barrel will be described with reference to FIGS. Reference numeral 29 denotes a front mask that covers the front surface of the first barrel member 26 by being fitted into the inner periphery of the first guide barrel 27 after the adjustment of the first barrel member 26. Reference numeral 30 denotes a front mask stopper plate which is attached to the first guide cylinder 27 by a bayonet structure and fixes the front mask 29. 31 is a dust-proof ring that closes the gap between the front mask 29 and the first lens barrel member 26 (the width of which varies with adjustment of the first lens barrel member 26), and 32 is attached to the tip of the first guide tube 27. A decorative veneer.

  FIG. 14 shows a system configuration of an imaging apparatus equipped with the lens barrel of this embodiment having an image blur correction function. Reference numeral 50 denotes an optical low-pass filter for removing high frequency components of the spatial frequency of the subject, and 51 denotes an image sensor such as a CCD sensor or a CMOS sensor which is arranged on the image surface of the lens barrel and converts the optical image into an electric signal. . The electric signal a read from the image sensor 51 is converted into an image signal b by the camera signal processing circuit 52.

  Reference numeral 53 denotes a microcomputer (hereinafter referred to as a microcomputer) that controls 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 each lens unit. Is moved in the optical axis direction.

The outputs of the focus reset circuit 54 and the zoom reset circuit 55 are obtained when a moving member to be detected moves to a predetermined position (reference position) set in advance (a photo interrupter is transmitted through a light shielding portion provided on the moving member). The microcomputer 53 detects the absolute position of each lens unit by counting the number of subsequent driving steps of the stepping motor with reference to the position. Thereby, accurate focal length information, subject information, and the like are obtained.

  An aperture driving circuit 58 drives the aperture shutter unit 5 and controls the aperture diameter and shutter speed of the aperture based on the brightness information of the video signal captured by the microcomputer 53. Reference numerals 59 and 60 denote angle detection circuits for detecting the pitch angle (vertical tilt angle) and the yaw angle (horizontal tilt angle) of the imaging apparatus. The angle is detected by, for example, integrating the output of an angular velocity sensor such as a vibrating gyroscope fixed to the photographing apparatus. Then, the outputs of both angle detection circuits 59 and 60, that is, information on the tilt angle of the photographing apparatus is taken into the microcomputer 53.

  Reference numerals 61 and 62 denote coil drive circuits for shifting the third lens unit L3 in the optical axis orthogonal direction, that is, the pitch (vertical direction) and yaw (lateral direction) in order to perform image blur correction. The coil drive circuits 61 and 62 are mounted on the third lens unit L3, and are driven to shift to the third lens unit L3 by controlling energization to the coils arranged in the gap of the magnetic circuit including the magnet.

  Reference numerals 63 and 64 denote position detection circuits for detecting the shift amounts of pitch (vertical direction) and yaw (horizontal direction) with respect to the optical axis of the third lens unit L3. When the third lens unit L3 is shifted, the light beam passing through the third lens unit L3 is bent, and the position of the subject image formed on the image sensor 51 is changed. At this time, the microcomputer 53 controls the driving of the third lens unit L3 so that the moving direction of the subject image is opposite to the direction in which the subject image moves when the photographing apparatus is actually tilted. By doing so, the formed subject image does not move even if the photographing apparatus tilts due to camera shake or the like. Thereby, image blur correction can be realized.

  In the microcomputer 53, the tilt signal of the photographing apparatus obtained by the pitch angle detection circuit 59 and the yaw angle detection circuit 60 and the shift amount of the third lens unit L3 obtained from the pitch position detection circuit 63 and the yaw position detection circuit 64. A difference from the signal is obtained, a signal indicating a difference in each direction is amplified, and phase compensation is performed. Based on the signal thus obtained, the third lens unit L3 is driven via the pitch coil drive circuit 61 and the yaw coil drive circuit 62. In this way, image blur correction control is performed so that the difference signal becomes smaller.

  In this embodiment, since the zooming operation is performed by the relative movement of the first to third lens units L1 to L3, the amount of movement of the image with respect to the shift amount of the third lens unit L3 varies depending on the focal length. End up. For this reason, the shift amount of the third lens unit L3 is not determined by using the tilt signal of the photographing apparatus obtained by the pitch angle detection circuit 59 and the yaw angle detection circuit 60 as it is, and is corrected by the focal length information.

The above is the description of the present embodiment, but the present invention is not limited to the configuration of the above embodiment, and any configuration may be used as long as it is the configuration shown in the claims. The invention can be applied not only to a lens-integrated image pickup apparatus but also to an interchangeable lens apparatus.

FIG. 15 is a diagram of a second lens barrel unit showing Embodiment 2 of the present invention. In the first embodiment, the two cam follower pins 24 are both provided separately from the cylindrical pin 23. However, in this embodiment, the one cam follower pin 24 and the cylindrical pin 23 are used as a common cam follower pin. 36 is an embodiment constituted by 36. Other configurations are the same as those in the first embodiment.

  The common cam follower pin 36 is engaged with the rectilinear groove portion 12b by the cylindrical portion 36a, is urged to the second cam groove portion 13c by the leaf spring 25, and the tip tapered portion 36b contacts the second cam groove portion 13c. .

  The common cam follower pin 36 is urged to the second cam groove 13c by the leaf spring 25, but may be fixed to the second barrel unit 2.

1 is an exploded perspective view of a lens apparatus that is Embodiment 1 of the present invention. FIG. 3 is a cross-sectional view of a main part of the lens barrel of Embodiment 1. FIG. Sectional drawing of the lens barrel of Example 1 (at the time of collapse). Sectional drawing (WIDE end) of the lens barrel of Example 1. FIG. Sectional drawing (TELE end) of the lens barrel of Example 1. FIG. FIG. 3 is a cross-sectional view of a one-unit barrel unit according to the first embodiment. The perspective view which looked at the 1 unit barrel unit of Example 1 from the front side. The perspective view which looked at the 1 unit barrel unit of Example 1 from the rear side. FIG. 3 is a perspective view when the one-unit barrel unit according to the first embodiment is bonded. FIG. 3 is a perspective view illustrating a sleeve portion of the aperture shutter unit according to the first embodiment. FIG. 3 is a perspective view illustrating a sleeve portion of a three-unit barrel according to the first embodiment. Sectional drawing of the movable wiring board of Example 1. FIG. FIG. 3 is a development view of the cam ring of the first embodiment. FIG. 3 is a development view of the cam ring of the first embodiment. 1 is a block diagram illustrating a lens barrel drive and shake correction system according to Embodiment 1. FIG. The figure which shows the 2nd lens-barrel unit of Example 2 of this invention.

Explanation of symbols

2 Second lens barrel unit 12 Fixed tube 12b Straight groove 13 Cam tube 13c Second cam groove 23 Straight key (cylindrical pin)
24 Cam Follower Pin

Claims (6)

A first member having a first engaging portion and a second engaging portion; a second member having a first cam portion engaged with the first engaging portion; and the second engaging portion. And a third member having a rectilinear guide portion that guides the joint portion in the optical axis direction, and the first member is rotated by the relative rotation between the first member and the second member. A lens device that moves in the direction of the optical axis with respect to three members,
The second engagement portion is provided at three locations in the circumferential direction of the first member, and the first engagement portion is provided at two locations in the circumferential direction of the first member ,
The second member has a second cam portion,
The first member has a third engagement portion at a position away from the second engagement portion in the optical axis direction,
The lens device includes a fourth member driven in the optical axis direction by the second cam portion,
The fourth member includes a third cam portion that engages with the third engagement portion, and is positioned in a direction orthogonal to the optical axis by the third engagement portion. .   2. The at least one of the two first engaging portions is biased in a direction of engaging the first cam portion with respect to the second member. The lens device according to 1.   The lens device according to claim 1, wherein the first member holds a first lens.   4. The device according to claim 1, wherein at least one of the two first engaging portions and at least one of the three second engaging portions are integrally formed. 5. The lens device according to one. The fourth member is any one of claims 1 4, characterized in that for holding the second lens disposed on the object side of the first lens holding said first member The lens device described. A lens device according to any one of claims 1 to 5 ;
An imaging device comprising: an imaging device that photoelectrically converts a subject image formed by the lens device.

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