JP2013178403A - Lens barrel and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel having a simplified structure.SOLUTION: The lens barrel comprises: a reference member; a first cylindrical member and a second cylindrical member fixed to the reference member and extended in a predetermined axis direction; a first shaft member sliding in the predetermined axis direction along the inner peripheral surface of the first cylindrical member; a second shaft member sliding in the predetermined axis direction along the inner peripheral surface of the second cylindrical member; a first holding member for holding a first optical member fixed to the first shaft member and guided in the predetermined axis direction by the sliding of the first shaft member to the first cylindrical member; and a second holding member for holding a second optical member fixed to the second shaft member and guided in the predetermined axis direction by the sliding of the second shaft member to the second cylindrical member.

Description

  The present invention relates to a lens barrel and an imaging apparatus.

  2. Description of the Related Art Conventionally, a lens barrel attached to a camera has a fixed barrel that is fixed to the camera, a cam barrel that rotates relative to the fixed barrel, and an optical axis that is rotated by the cam barrel. A plurality of lens groups moving in the direction are provided (for example, see Patent Document 1).

JP 2000-89086 A

  Such a lens barrel has various design restrictions in order to ensure optical performance. In order to ensure optical performance under the restriction, the structure in the lens barrel should be simplified.

  Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a lens barrel and an imaging apparatus that have a simplified structure.

  The lens barrel of the present invention includes a reference member (10), a first cylindrical member (36A) and a second cylindrical member (36B) that are fixed to the reference member and extend in a predetermined axial direction, and the first cylinder. A first shaft member (30A) that slides in the predetermined axial direction along the inner peripheral surface of the cylindrical member, and a second shaft that slides in the predetermined axial direction along the inner peripheral surface of the second cylindrical member A member (30B) and a first optical member (L2) that is fixed to the first shaft member and is guided in the predetermined axial direction by sliding the first shaft member with respect to the first tubular member. A holding member (12) and a second optical member (L3) fixed to the second shaft member and guided in the predetermined axial direction by sliding the second shaft member relative to the second tubular member are held. And a second holding member (13).

  In this case, the first holding member is in contact with the second shaft member or the second cylindrical member, so that the movement operation around the predetermined axis is restricted, and the second holding member is The movement operation in the direction around the predetermined axis can be restricted by contacting the one-axis member or the first cylindrical member.

  The first optical member and the second optical member are arranged in order from the objective side, the first holding member is fixed to an end of the first shaft member, and the second holding member is the first optical member. It can be fixed to the image side portion from the end of the biaxial member. In this case, the first cylindrical member and the second cylindrical member may be disposed on the image side with respect to the second optical member.

  In the lens barrel of the present invention, the first cylindrical member and the second cylindrical member may be disposed at positions that are opposed to each other by 180 degrees with respect to the optical axis of the lens barrel.

  Further, in any one of the first cylindrical member and the second cylindrical member, the third holding members (14, 15) that hold the third optical members (L4 to L6) move in the predetermined axial direction. The third holding member is in contact with either one of the first cylindrical member and the second cylindrical member, so that the movement operation around the predetermined axis is restricted. It can be. In this case, the first holding member, the second holding member, and the third holding member can be sequentially arranged from the objective side.

  The imaging device of the present invention is an imaging device including the lens barrel (100) of the present invention and an imaging unit (200) that captures an image connected by the lens barrel.

  In addition, in order to explain the present invention in an easy-to-understand manner, the above description has been made in association with the reference numerals of the drawings representing one embodiment. However, the present invention is not limited to this, and the configuration of an embodiment described later is provided. May be modified as appropriate, or at least a part thereof may be replaced with another component. Further, the configuration requirements that are not particularly limited with respect to the arrangement are not limited to the arrangement disclosed in the embodiment, and can be arranged at a position where the function can be achieved.

  The lens barrel and the imaging device of the present invention have an effect that the structure can be simplified.

It is a figure which shows the structure of the camera which concerns on one Embodiment. It is sectional drawing which shows a lens-barrel (state in a wide-angle end). It is sectional drawing which shows a lens-barrel (state in a telephoto end). FIG. 4A is a view showing the second group lens sliding cylinder, the third group lens sliding cylinder, and the vicinity thereof, and FIG. 4B is a cross-sectional view taken along line AA in FIG. 4 (c) is a modification of FIG. 4 (b), FIG. 4 (d) is a cross-sectional view taken along line BB of FIG. 4 (a), and FIG. FIG. 4C is a modified example of FIG. It is a figure which takes out and shows the 4th, 6th group lens sliding cylinder, 5th group lens sliding cylinder, and its vicinity. 6A is a cross-sectional view taken along line CC in FIG. 5, and FIG. 6B is a cross-sectional view taken along line DD in FIG. FIGS. 7A and 7B are diagrams showing modifications (No. 1 and No. 2) relating to the arrangement of the second group lens and the third group lens. It is a figure which shows the modification (the 3) regarding arrangement | positioning of a 2 group lens and a 3 group lens.

  Hereinafter, a camera according to an embodiment and a lens barrel included in the camera will be described in detail with reference to FIGS.

  FIG. 1 schematically shows a camera 500 according to the present embodiment. As shown in FIG. 1, the camera 500 includes an imaging unit 200 and a lens barrel 100.

  The imaging unit 200 includes a housing 210, an optical system including a primary mirror 212, a pentaprism 214, and an eyepiece optical system 216 housed in the housing 210, a focus detection device 230, a shutter 234, and an image sensor 238. And a main LCD 240 and a main control unit 250.

  In the state of FIG. 1, the main mirror 212 guides most of the incident light incident from the lens barrel 100 to a focusing screen 222 disposed above. The focusing screen 222 is disposed at a focus position of the optical system in the lens barrel 100 and forms an image formed by the optical system in the lens barrel 100.

  The pentaprism 214 reflects the image formed on the focusing screen 222 and then guides it to the eyepiece optical system 216 via the half mirror 224. Thereby, the eyepiece optical system 216 can observe the image on the focusing screen 222 as a normal image. In this case, the half mirror 224 superimposes a display image formed on the finder LCD 226 indicating the shooting conditions, setting conditions, and the like on the image of the focusing screen 222. Accordingly, at the exit end of the eyepiece optical system 216, it is possible to observe a state in which the image on the focusing screen 222 and the image on the viewfinder LCD 226 are superimposed. A part of the light emitted from the pentaprism 214 is guided to the photometry unit 228, and the photometry unit 228 measures the intensity of the incident light, its distribution, and the like.

  The focus detection device 230 uses the light transmitted through the primary mirror 212 and reflected by the secondary mirror 232 provided on the back side of the primary mirror 212 to adjust the focus of the optical system in the lens barrel 100 ( Detect focus state. Note that the primary mirror 212 and the secondary mirror 232 are raised to a position indicated by a broken line in FIG. 1 so as to be retracted from the optical path of incident light incident from the lens barrel 100 at the time of photographing.

  The shutter 234 is disposed behind the primary mirror 212 (behind the optical path of incident light incident from the lens barrel 100), and performs an opening operation in conjunction with the ascending operation of the primary mirror 212 and the secondary mirror 232 at the time of shooting. Do. In a state where the shutter 234 is opened, incident light from the lens barrel 100 enters the image sensor 238 via the optical filter 236. The image sensor 238 converts an image formed by incident light into an electrical signal.

  The main LCD 240 has a display screen portion exposed to the outside of the housing 210. On the display screen of the main LCD 240, various setting information and the like in the imaging unit 200 are displayed in addition to the video (captured video) formed on the imaging device 238.

  The main control unit 250 comprehensively controls various operations of the respective units. The main control unit 250 drives the optical system (lenses L1 to L6) in the lens barrel 100 with reference to the information on the focus adjustment state of the optical system detected by the focus detection device 230 in the imaging unit 200. (Autofocus), referring to the amount of operation of the optical system in the lens barrel 100, the fact that it is in focus is displayed on the finder LCD 226 (focus aid).

  Next, the configuration of the lens barrel 100 will be described in detail with reference to FIGS.

  2 and 3 are cross-sectional views of the lens barrel 100. FIG. Among these, FIG. 2 shows a state in which the lens barrel 100 is at the wide-angle end, and FIG. 3 shows a state in which the lens barrel 100 is zoomed to the telephoto end. As shown in these drawings, the lens barrel 100 includes a first group lens L1, a second group lens L2, a third group lens L3, a fourth group lens L4, and a fifth group lens L5, 6 arranged on a common optical axis AX. It has a group lens L6. In the following description, the first group lens L1 side (objective side) in the optical axis AX direction is the front side, and the sixth group lens L6 side (image side) is the rear side.

  As shown in FIGS. 2 and 3, the lens barrel 100 includes a fixed barrel 10, a first group lens sliding cylinder 11 that holds the first group lens L1, and a second group lens sliding cylinder that holds the second group lens L2. 12, a third group lens sliding cylinder 13 holding the third group lens L3, a fourth group lens sliding cylinder 14 holding the fourth group lens L4 and the sixth group lens L6, and 5 holding the fifth group lens L5. A group lens sliding cylinder 15.

  The fixed cylinder 10 is fixed to the imaging unit 200 at the base 10a. In this fixed state, the fixed cylinder 10, that is, the lens barrel 100 is in contact with the imaging unit 200 by the end surface 10 b of the fixed cylinder 10 on the imaging unit 200 side being in close contact with the imaging unit 200 (the casing 210 in FIG. 1). Positioned. The fixed cylinder 10 supports the guide pipe 36A in the vicinity of the upper part (ceiling part) in the interior thereof, and supports the guide pipe 36B in the vicinity of the lower part of the interior thereof. These guide pipes 36A and 36B are disposed at positions that face each other by 180 degrees with respect to the optical axis (AX) of the lens barrel 100 (positions that are substantially the same distance from the optical axis and that face each other across the optical axis). ing.

  The first group lens sliding cylinder 11 is connected to a zoom drive cylinder 16 provided inside the first group lens sliding cylinder 11 so as to be interlocked. Specifically, the cam pin 75 implanted in the first group lens sliding cylinder 11 is engaged with a cam groove 16 a formed in the zoom driving cylinder 16.

  On the other hand, the zoom drive cylinder 16 is connected to a zoom operation ring 18 that can freely rotate around the optical axis AX at the outermost periphery of the lens barrel 100. Specifically, a driving force transmission pin 19 projecting outward from the zoom driving cylinder 16 is engaged with an operation groove 18 a parallel to the optical axis AX formed on the inner surface of the zoom operation ring 18. Thereby, the zoom drive cylinder 16 rotates in conjunction with the rotation of the zoom operation ring 18. The zoom operation ring 18 cannot be moved in the front-rear direction, and an anti-slip rubber layer is provided on the outer peripheral surface thereof. The zoom operation ring 18 is rotated by the user during zooming.

  The zoom drive cylinder 16 is rotatable with respect to the zoom guide cylinder 22 provided on the inside thereof. As shown in the lower half of FIGS. 2 and 3, the zoom guide tube 22 is formed with a cam groove 22 a, and the zoom guide tube 22 and a straight groove 16 b formed through the zoom drive tube 16. The rotary connecting member 21 fixed to the cam ring 20 provided on the inner side of the fixed cylinder 10 is engaged.

  According to the above structure, when the zoom operation ring 18 is rotated, the zoom driving cylinder 16 is rotated by the action of the driving force transmission pin 19, and the first group lens sliding cylinder 11 is moved in the front-rear direction by the action of the rotation and the cam pin 75. It moves in the direction along the optical axis AX. Further, when the zoom driving cylinder 16 is rotated by the rotation of the zoom operation ring 18, this rotational force is transmitted to the cam ring 20 via the rotary connecting member 21, so that the cam ring 20 moves in the front-rear direction while rotating. The zoom guide tube 22 moves in the front-rear direction without rotating.

  A cover cylinder 17 is provided between the zoom operation ring 18 and the first group lens sliding cylinder 11. As shown in FIGS. 2 and 3, the cover cylinder 17 moves in the front-rear direction in accordance with the first group lens sliding cylinder 11, and seals between the zoom operation ring 18 and the first group lens sliding cylinder 11. This is to stop the dust from entering the lens barrel 100.

  FIG. 4A is a diagram showing the second group lens sliding cylinder 12, the third group lens sliding cylinder 13, and the vicinity thereof. As shown in FIG. 4A, the second group lens sliding cylinder 12 surrounds the holding cylinder 24 that holds the second group lens L2, the press ring 26 fixed to the holding cylinder 24, and the outer periphery of the holding cylinder 24. And an engagement cylinder 28 provided in a state. The holding cylinder 24 and the pressing ring 26 are fixed by screwing or the like, and sandwich the outer edge portion of the second group lens L2.

  The engagement cylinder 28 cantilever-supports one guide bar 30A. Further, the engagement cylinder 28 is engaged with the other guide bar 30B in the engagement groove 28b. Here, the guide bars 30A and 30B are arranged at positions that are vertically symmetrical with respect to the optical axis AX (positions that face each other by 180 °). 2 and 3, the guide bar 30A is slidably inserted into the guide pipe 36A supported by the fixed cylinder 10, and the guide bar 30B is slidable by the guide pipe 36B supported by the fixed cylinder 10. Inserted into. The guide bar 30A (30B) and the guide pipe 36A (36B) do not have to be in surface contact, and are in point contact at two points near one end and the other end of the guide pipe 36A (36B). You can just do it.

  As the material of the guide bars 30A and 30B, a high-strength and light-weight material, such as stainless steel, can be used. Between the engagement tube 28 and the guide bars 30A and 30B, a process such as adhesion or press-fitting is performed. It is fixed through. As the material of the guide pipes 36A and 36B, stainless steel or the like can be used as in the case of the guide bars 30A and 30B. Here, as the guide pipe 36A, for example, a pipe having a diameter of about 2 to 3 mm and a thickness (difference between an inner diameter and an outer diameter) of about 0.3 to 0.4 mm can be employed. In this case, the inner diameter of the guide pipe 36A and the outer diameter of the guide bar 30A, and the inner diameter of the guide pipe 36B and the outer diameter of the guide bar 30B are substantially the same. Here, “substantially the same diameter” means a dimension in which a gap that does not interfere with the slide is formed between the guide pipe 36A and the guide bar 30B, and between the guide pipe 36B and the guide bar 30B.

  The engagement groove 28b of the engagement cylinder 28 is a groove having a substantially inverted U-shape as shown in FIG. 4B, which is a cross-sectional view taken along line AA of FIG. The width of the engaging groove 28b (width ha in the horizontal direction of FIG. 4B) is substantially the same as the diameter of the guide bar 30B, that is, there is no hindrance to the sliding movement of the second group lens sliding cylinder 12 in the front-rear direction. The dimension is set such that a gap of a certain degree is formed. The second group lens sliding cylinder 12 is restrained from rotating in the rotational direction around the guide bar 30A by engaging the engaging groove 28b with the guide bar 30B. Instead of the engaging groove 28b, the second group lens sliding cylinder 12 may be provided with a guide hole 28b 'having an oval cross section as shown in FIG.

  Returning to FIG. 4A, a protruding follower 28 a is formed on a part of the outer peripheral surface of the engagement cylinder 28. The follower 28 a is engaged with a circumferential groove 32 c of an interlocking ring 32 provided outside the engagement cylinder 28. The follower 28a is disposed in the vicinity of the guide bar 30A, that is, in the vicinity of an extension shaft obtained by extending the central axis of the guide bar 30A.

  The interlocking ring 32 in which the circumferential groove 32c is formed further includes an interlocking groove 32a and a cam follower 32b. One end of an interlocking key 34 having a substantially L-shape is engaged with the interlocking groove 32a. The interlocking key 34 is connected to a focus ring 37 provided on the outer peripheral portion of the fixed cylinder 10 shown in FIGS. 2 and 3, and the optical axis AX is rotated along with the rotation of the focus ring 37 around the optical axis AX. It moves in the rotation direction around the center. Thus, when the interlocking key 34 moves in the rotation direction around the optical axis AX, the interlocking ring 32 rotates around the optical axis AX. The interlock key 34 is also connected to a motor 38 provided in the motor chamber 10 c of the fixed cylinder 10. Therefore, the interlocking ring 32 also rotates around the optical axis AX by the movement of the interlocking key 34 in the rotational direction around the optical axis AX accompanying the rotational operation of the motor 38.

  The cam follower 32 b is engaged with a cam groove 20 b formed in the cam ring 20. Therefore, when the interlocking ring 32 rotates, the interlocking ring 32 and the members (the second group lens sliding cylinder 12, the guide bar 30A, the second group lens L2) connected to the cam ring 20b and the cam follower 32b. Due to the action, it moves in the front-rear direction. In this movement in the front-rear direction, the interlocking ring 32 moves in the front-rear direction while rotating around the optical axis AX. However, the movement direction of the guide bar 30A is restricted only in the front-rear direction by the guide pipe 36A. The second group lens sliding cylinder 12 and the second group lens L2 connected to the bar 30A move in the front-rear direction without rotating. The cam follower 32b is disposed in the vicinity of the guide bar 30A, that is, in the vicinity of an extension shaft obtained by extending the central axis of the guide bar 30A.

  As shown in FIG. 4A, the third group lens sliding cylinder 13 has a circular hole 13b and an oval hole 13a. The circular hole 13b has the same inner diameter as the outer diameter of the cross section of the guide bar 30B. The third group lens sliding cylinder 13 holds the guide bar 30B inserted through the circular hole 13b. The oval hole 13a has an oval shape as shown in FIG. 4D, which is a cross-sectional view taken along line BB in FIG. The width of the oval hole 13a (the width hb in the horizontal direction in FIG. 4D) is substantially the same as the diameter of the guide bar 30A, that is, there is a gap that does not hinder the sliding of the third group lens sliding cylinder 13. The dimension to be formed is set. In the third group lens sliding cylinder 13, movement of the rotation direction around the guide bar 30 </ b> B is suppressed by engaging the oval hole 13 a with the guide bar 30 </ b> A. In place of the oval hole 13a, a groove 13a 'having a U-shaped cross section as shown in FIG.

  A cam follower 13 c is provided in the vicinity of the circular hole 13 b of the third group lens sliding cylinder 13. The cam follower 13c is engaged with a cam groove 20d formed in the cam ring 20, as shown in FIG. Therefore, when the interlocking ring 32 rotates, the cam ring 20 also rotates, so that the third group lens sliding cylinder 13 moves in the front-rear direction by the action of the cam groove 20d and the cam follower 13c. In this movement in the front-rear direction, the movement direction of the guide bar 30B is restricted only in the front-rear direction by the guide pipe 36B. Therefore, the third group lens sliding cylinder 13 and the third group lens L3 connected to the guide bar 30B are , Move back and forth without rotating.

  FIG. 5 is a view showing the fourth and sixth group lens sliding cylinders 14 and the fifth group lens sliding cylinder 15 and the vicinity thereof. As shown in FIG. 5, the fourth and sixth lens group sliding cylinders 14 hold the fourth lens group L4 and the sixth lens group L6 at a predetermined interval in the optical axis AX direction. The fourth and sixth group lens sliding cylinders 14 have two engaging portions 14a and 14b that engage with the guide pipe 36A and one engaging portion 14c that engages with the guide pipe 36B.

  The engaging part 14b (and 14a) has the circular through-hole 31, as shown to Fig.6 (a) which is CC sectional view taken on the line of FIG. The through hole 31 has substantially the same diameter as the guide pipe 36A, and the weight of the fourth and sixth group lens sliding cylinders 14 is supported by the guide pipe 36A in a state where the guide pipe 36A is inserted into the through hole 31. . Here, “substantially the same diameter” means a dimension in which a gap is formed between the guide pipe 36 </ b> A and the through hole 31 so as not to interfere with the sliding of the fourth and sixth group lens sliding cylinders 14. On the other hand, the engaging portion 14 c has a U-shaped groove 33. The width of the U-shaped groove 33 is set to a dimension that is substantially the same as the diameter of the guide pipe 36 </ b> B, that is, a clearance that does not hinder the sliding of the fourth and sixth group lens sliding cylinders 14. In the fourth and sixth group lens sliding cylinders 14, the U-shaped groove 33 is engaged with the guide pipe 36B, so that the movement in the rotation direction around the guide pipe 36A is suppressed. In addition, instead of the U-shaped groove 33, a long oval hole in the radial direction may be formed in the engaging portion 14c.

  Further, as shown in FIG. 5, a cam follower 35 projects from a part of the outer peripheral portion of the fourth and sixth group lens sliding cylinder 14. The cam follower 35 is engaged with a cam groove 20 c formed in the cam ring 20. For this reason, when the cam ring 20 rotates around the optical axis AX, the fourth and sixth group lens sliding cylinders 14 receive a driving force in the front-rear direction (optical axis AX direction) in conjunction with the rotation operation. Since the fourth and sixth group lens sliding cylinders 14 are engaged with the guide pipes 36A and 36B as described above, they move only in the front-rear direction without rotating around the optical axis AX. 5 and 2 and the like, illustration of the cam follower 35 and the cam groove 20c is omitted for convenience of illustration.

  As shown in FIG. 5, an upper opening 14d is formed in the upper part of the fourth and sixth group lens sliding cylinder 14, and a lower opening 14e is formed in the lower part.

  As shown in FIG. 5, the fifth group lens sliding cylinder 15 is provided in the internal space of the fourth and sixth group lens sliding cylinder 14, and the upper end portion thereof extends from the upper opening 14 d of the fourth and sixth group lens sliding cylinder 14. The lower end portion is exposed from the lower opening 14 e of the fourth and sixth group lens sliding cylinder 14. Engaging portions 15a and 15b that engage with the guide pipe 36A are provided at the upper end portion of the fifth group lens sliding cylinder 15, and an engaging portion 15c that is engaged with the guide pipe 36B is provided at the lower end portion. Yes.

  The engaging part 15a (and 15b) has the circular through-hole 41 as shown in FIG.6 (b) which is DD sectional drawing of FIG. The through hole 41 has substantially the same diameter as the guide pipe 36A, that is, a diameter that forms a gap that does not hinder the sliding of the fifth group lens sliding cylinder 15, and the guide pipe 36A is inserted into the through hole 41. In this state, the weight of the fifth group lens sliding cylinder 15 is supported. On the other hand, the engaging portion 15 c has a U-shaped groove 43. The width of the U-shaped groove 43 is set to a dimension that is substantially the same as the diameter of the guide pipe 36 </ b> B, that is, a gap that does not hinder the sliding of the fifth group lens sliding cylinder 15. In the fifth group lens sliding cylinder 15, the U-shaped groove 43 is engaged with the guide pipe 36 </ b> B, so that the movement in the rotation direction around the guide pipe 36 </ b> A is suppressed. In addition, instead of the U-shaped groove 43, a long oval hole in the radial direction may be formed in the engaging portion 15c.

  Further, as shown in FIG. 6B, a cam follower 45 projects from a part of the outer peripheral portion of the fifth group lens sliding cylinder 15. Since this cam follower 45 is engaged with a cam groove 20d (see FIG. 6A) formed in the cam ring 20, when the cam ring 20 rotates around the optical axis AX, It moves in the direction (optical axis AX direction). In this case, since the fifth group lens sliding cylinder 15 is engaged with the guide pipes 36A and 36B as described above, it moves in the front-rear direction without rotating. 5 and 2 and the like, illustration of the cam follower 45 and the cam groove 20d is omitted for convenience of illustration.

  Here, as shown in FIG. 6A, the cam followers 35 and 45 are disposed in the vicinity of the guide pipe 36A. Here, the vicinity of the guide pipe 36A means a range of about 0 ° to 45 °, for example. Thus, by arranging the cam followers 35, 45 in the vicinity of the guide pipe 36A, the force (force in the front-rear direction) from the cam followers 35, 45 acts in the vicinity of the guide pipe 36A. Thus, efficient movement of the sliding cylinders 14 and 15 can be realized. If there is no design restriction, the cam followers 35 and 45 are preferably located in the vicinity of the guide pipe 36A.

  Next, based on FIGS. 2 and 3, the movement operation of the lenses L1 to L6 when performing the zoom operation (zooming) and the movement operation of the lenses L1 to L6 when focusing (focusing) will be described. .

  First, the movement operation of each lens during zooming will be described. Here, the operation from the state in which the lens barrel 100 is at the wide-angle end (FIG. 2) to the zooming to the telephoto end (FIG. 3) will be described.

  When the zoom operation ring 18 is rotated by the user from the state of FIG. 2, the zoom drive cylinder 16 rotates, and the first lens group sliding cylinder 11 and the first lens group L1 are moved forward via the cam groove 16a and the cam pin 75. Go straight on. Further, when the zoom operation ring 18 is rotated, the cam ring 20 is rotated via the rotary connecting member 21 and the like as described above. Along with this rotation, a rotational force and a forward moving force also act on the interlocking ring 32 via the cam follower 32b (see FIG. 4A), but the interlocking ring 32 engages with the interlocking groove 32a. Since it is guided only in the front-rear direction by the interlocking key 34 (fixed state), it moves straight forward without rotating. As the interlocking ring 32 moves straight, the engagement cylinder 28 (that is, the second group lens sliding cylinder 12) and the second group lens L2 that engage with the interlocking ring 32 move in the forward direction. Further, the third lens group sliding cylinder 13 and the third lens group L3 engaged with the cam ring 20 move in the forward direction.

  Further, the rotation of the cam ring 20 is caused by the forward movement of the fourth and sixth group lens sliding cylinders 14 and the fifth group lens sliding cylinder 15 (the fourth to sixth group lenses L4 to L6) engaged via the cam followers 35 and 45. Move to. The moving distance between the lenses L4 and L6 and the lens L5 varies depending on the formation direction (angle) of the cam grooves 20c and 20d with which the cam follower 35 and the cam follower 45 are engaged. Since the cam ring 20 itself moves in the forward direction, the actual moving distance of each of the lenses L4 to L6 is the sum of the moving distance of the cam ring 20 and the moving distance of the cam followers 35 and 45 by the cam grooves 20c and 20d. Become.

  Thus, during zooming, each of the 1st to 6th group lenses L1 to L6 moves forward by a different distance (however, the lenses L4 and L6 are the same distance) as the zoom operation ring 18 rotates. It is supposed to be.

  Next, the movement operation of each lens during focusing will be described.

  First, when the focus ring 37 is rotated by the user or the motor 38 is driven to rotate, the interlock key 34 moves in the rotation direction around the optical axis AX, as described above, the interlock key 34 The interlocking ring 32 to be engaged rotates around the optical axis AX. By this rotation, the interlocking ring 32 moves in the forward direction along the cam follower 32 b along the cam groove 20 b of the cam ring 20. Then, by the movement of the interlocking ring 32 in the rotational direction and the forward direction, the engaging cylinder 28 (that is, the second lens group sliding cylinder 12) having the follower 28a engaged with the circumferential groove 32c of the interlocking ring 32 and the second lens group L2 Will also move forward. Here, since the cam follower 32b and the follower 28a are disposed in the vicinity of the guide bar 30A, the driving force in the optical axis AX direction can be efficiently applied to the interlocking ring 32 and the engagement cylinder 28.

  On the other hand, since the cam ring 20 is in a non-rotating fixed state, the first group lens L1 and the third to sixth group lenses L3 to L6 do not move in the front (rear) direction.

  In this way, during focusing, only the second group lens L2 moves in the front (rear) direction as the interlocking key 34 rotates.

  Note that the rotation of the motor 38 during focusing is controlled by the main control unit 250 in FIG. 1 based on the detection result of the focus detection device 230. That is, autofocus is executed by the rotation control of the motor 38 by the main control unit 250. Note that the lens barrel 100 and the imaging unit 200 are electrically connected by a connection terminal provided between the lens barrel 100 and the imaging unit 200, and thereby, the lens barrel 100 (for example, Electric power is supplied to the motor 38 and the like from the imaging unit 200 side.

  As described above in detail, according to the present embodiment, the guide pipes 36A and 36B extending in the optical axis AX direction are fixed to the fixed cylinder 10, and the guide bars 30A and 30B are disposed on the inner peripheral surfaces of the guide pipes 36A and 36B. Along the direction of the optical axis AX. The second group lens sliding cylinder 12 holding the second group lens L2 is fixed to the guide bar 30A, and is guided in the optical axis AX direction by sliding the guide bar 30A with respect to the guide pipe 36A. Further, the third group lens sliding cylinder 13 holding the third group lens L3 is fixed to the guide bar 30B, and is guided in the optical axis AX direction by sliding the guide bar 30B with respect to the guide pipe 36B. As described above, in the present embodiment, the second group lens sliding cylinder 12 and the third group lens sliding cylinder 13 can be separately guided by the two guide bars (30A, 30B). It is possible to simplify the structure. Thereby, the space efficiency in the lens barrel 100 can be improved, and the lens barrel 100 can be downsized. In addition, by reducing the size of the lens barrel 100, the entire camera 500 can be reduced in size.

  Further, according to the present embodiment, the second group lens sliding cylinder 12 is in contact with the guide bar 30B, whereby the movement operation around the optical axis AX is restricted, and the third group lens sliding cylinder 13 is guided by the guide bar 30A. The movement operation in the direction around the optical axis AX is restricted. Accordingly, the guide bar (30A, 30B) to which one of the second group lens sliding cylinder 12 and the third group lens sliding cylinder 13 is fixed is changed to the other of the second group lens sliding cylinder 12 and the third group lens sliding cylinder 13. Therefore, the space efficiency in the lens barrel 100 can be improved, and the lens barrel 100 can be downsized.

  In the present embodiment, the second group lens L2 and the third group lens L3 are arranged in order from the objective side, and the second group lens sliding cylinder 12 is fixed to the end of the guide bar 30A, and the third group lens sliding cylinder. 13 is fixed to the image side portion from the end of the guide bar 30B. Thereby, the space efficiency of the lens barrel 100 can be improved while suppressing the mechanical interference between the second group lens sliding cylinder 12 and the third group lens sliding cylinder 13.

  In the present embodiment, since the guide pipes 36A and 36B are disposed at positions facing each other by 180 degrees with respect to the optical axis AX of the lens barrel 100, the distance between the guide bars 30A and 30B can be made as large as possible. it can. As a result, the force required when the rotation of the second group lens sliding cylinder 12 and the third group lens sliding cylinder 13 around the optical axis AX direction is restricted by the guide bars 30A and 30B can be reduced, and as a result, the guide The force and deformation applied to the bars 30A and 30B can be reduced.

  Further, the fourth and sixth group lens sliding cylinders 14 and the fifth group lens sliding cylinder 15 use the guide pipe 36A as a guide and the guide pipe 36B as a steady stop, so that they are not in contact with the guide bars 30A and 30B. . Thus, even when the second group lens sliding cylinder 12 or the third group lens sliding cylinder 13 is moved during focusing, the fourth and sixth group lens sliding cylinders 14 and the fifth group lens sliding cylinder 15 are The sliding of the guide bars 30A and 30B is not hindered. Thereby, since the force required to move the second group lens sliding cylinder 12 can be reduced, the burden on the motor 38 or the burden on the user who rotates the focus ring 37 can be reduced.

  In the above embodiment, the case where the second group lens L2 to the sixth group lens L6 are arranged from the object side to the image side has been described, but the present invention is not limited to this. For example, as shown in FIG. 7A, the third group lens L3 of the above embodiment may be arranged closer to the image side than the sixth group lens L6. Even if it does in this way, the effect similar to the said embodiment can be acquired by devising the length etc. of a guide bar. Further, as shown in FIG. 7B and FIG. 8, a guide pipe 36 </ b> A or 36 </ b> B may be used for one steadying of the second group lens sliding cylinder 12 and the third group lens sliding cylinder 13. Further, by combining FIG. 7B and FIG. 8, the guide pipe 36 </ b> A or 36 </ b> B may be used for steadying both the second group lens sliding cylinder 12 and the third group lens sliding cylinder 13.

  In the above-described embodiment, the guide pipes 36A and 36B are opposed to each other by 180 degrees with respect to the optical axis (AX) of the lens barrel 100 (the distance from the optical axis is the same, and are opposed to each other across the optical axis). However, the present invention is not limited to this, and the guide pipes 36A and 36B may be arranged at arbitrary positions in consideration of the space in the lens barrel 100 and the like. Good.

  In the above embodiment, all of the first to sixth group lenses L1 to L6 move in the optical axis AX direction during zooming, and only the second group lens L2 moves in the optical axis AX direction during focusing. Although the case (inner focus type) has been described, the present invention is not limited to this. For example, at the time of focusing, any of the lenses L1, L3 to L6 other than the second group lens L2 may be moved in the optical axis AX direction. Among these methods, the method of performing focusing by moving the first group lens L1 is called a front lens payout method. Further, at the time of focusing, all the lenses of the first to sixth group lenses L1 to L6 or a plurality of these lenses may be moved. Among these, the method in which all the lenses are moved is called the entire extension method.

  In the above embodiment, the guide pipes 36A and 36B are configured separately from the fixed cylinder 10, and the guide pipes 36A and 36B are supported by the fixed cylinder 10. However, the present invention is not limited to this. . For example, the guide pipes 36A and 36B and the fixed cylinder 10 may be integrally formed.

  In the above embodiment, the case where the fourth group lens L4 and the sixth group lens L6 are held by the common lens sliding cylinder 14 is described. However, the present invention is not limited to this, and the fourth group lens L4 and the sixth group lens L6 are Alternatively, they may be held by separate lens sliding cylinders.

  Note that the number of lenses and the lens arrangement in the above embodiment are examples. That is, the lens barrel includes at least a lens held by one lens sliding cylinder fixed to the guide bar 30A and a lens held by another lens sliding cylinder fixed to the guide bar 30B. It only has to have.

  Moreover, although the case where a lens was employ | adopted as an optical member was demonstrated in the said embodiment, it is not restricted to this, It is also possible to employ | adopt optical members, such as a mirror and an image pick-up element.

  The above-described embodiment is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Fixed cylinder 12 2nd group lens sliding cylinder 13 3rd group lens sliding cylinder 14 4, 6th group lens sliding cylinder 15 5th group lens sliding cylinder 36A, 36B Guide pipe 30A, 30B Guide bar L2 2nd group lens L3 3rd group Lens L4 4th group lens L5 5th group lens L6 6th group lens 100 Lens barrel 200 Imaging unit 500 Camera

Claims (8)

A reference member;
A first cylindrical member and a second cylindrical member that are fixed to the reference member and extend in a predetermined axial direction;
A first shaft member that slides in the predetermined axial direction along an inner peripheral surface of the first tubular member;
A second shaft member that slides in the predetermined axial direction along an inner peripheral surface of the second cylindrical member;
A first holding member that holds the first optical member, which is fixed to the first shaft member and is guided in the predetermined axial direction by sliding the first shaft member relative to the first tubular member;
A lens mirror, which is fixed to the second shaft member and is guided in the predetermined axial direction by sliding the second shaft member with respect to the second cylindrical member, and holds a second optical member. Tube. The first holding member is brought into contact with the second shaft member or the second cylindrical member, so that the movement operation around the predetermined axis is restricted,
2. The lens barrel according to claim 1, wherein the second holding member is restricted from moving in a direction around the predetermined axis by contacting the first shaft member or the first cylindrical member. . The first optical member and the second optical member are arranged in order from the objective side,
The first holding member is fixed to an end of the first shaft member;
3. The lens barrel according to claim 1, wherein the second holding member is fixed to a portion closer to the image side than an end of the second shaft member.   The lens barrel according to claim 3, wherein the first cylindrical member and the second cylindrical member are disposed on the image side with respect to the second optical member.   The said 1st cylindrical member and the said 2nd cylindrical member are arrange | positioned in the position which opposes 180 degree | times on the basis of the optical axis of the said lens barrel. The lens barrel described in 1. One of the first cylindrical member and the second cylindrical member is used as a guide when a third holding member that holds a third optical member moves in the predetermined axial direction,
2. The moving operation in the direction around the predetermined axis is regulated by contacting the other one of the first cylindrical member and the second cylindrical member with the third holding member. The lens barrel according to any one of? 5.   The lens barrel according to claim 6, wherein the first holding member, the second holding member, and the third holding member are arranged in order from the objective side. The lens barrel according to any one of claims 1 to 7,
An imaging device comprising: an imaging unit that captures an image connected by the lens barrel.

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