JP2016122118A - Zoom lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-step extension type zoom lens barrel that achieves an appropriate layout of a flexible substrate.SOLUTION: In a zoom lens barrel having first, second and third extention step parts in order from an outer side, and supporting an inward movement part movable to an optical axis direction within the third extension step part, when performing an operation from a storage state to a zoom shooting area, the first, second and third extension step parts move to an object side in the optical axis direction, respectively. When changing a focal distance in the zoom shooting area, the first extension step part and the third extension step part do not move to the optical axis direction with respect to a stationary barrel and the second extension step part, and the second extension step part moves to the optical axis direction with respect to the first extension step part. The flexible substrate connecting electronic components and a control unit supported by the inward movement unit has: a first support part that is fixedly supported to a second step rectilinear guide ring consisting of the second extension step part; a second support part that is fixedly supported to the stationary barrel; a first intermediate part that runs from the electronic component to the first support part; and a second intermediate part that runs from the first support part to the second support part. The first intermediate part and the second intermediate part are not fixed with respect to the first extension step part and the third extension step part, respectively.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a zoom lens barrel, and more particularly to an arrangement structure of a flexible substrate in a zoom lens barrel.

  In a zoom lens barrel constituting an imaging apparatus, a flexible substrate is frequently used as means for connecting an electrical component such as a shutter for electrically controlling operation to a control circuit. When an electrical component is supported on a moving part that can move in the optical axis direction with a zoom lens barrel that extends, in order to prevent an excessive load or disconnection when moving the moving part, the length of the flexible substrate It has a margin. However, if the flexible substrate is too long or improperly arranged, unnecessary looseness may occur in the flexible substrate, which may interfere with the constituent members of the zoom lens barrel or block the optical path. Therefore, it is required to arrange the flexible substrate with an appropriate length and arrangement so that such a problem does not occur.

  Patent Documents 1 to 4 describe an arrangement structure of a flexible substrate connected to a shutter block supported in a zoom lens barrel. In Patent Document 1 and Patent Document 2, a multistage zoom lens barrel is used, and a flexible substrate is supported on each extending stage from a fixed cylinder located on the outermost side to a moving part that supports a shutter block. The structure made is described. Each feeding step portion has a cylindrical rectilinear moving member that linearly moves in the optical axis direction. A strip-shaped flexible substrate with the longitudinal direction in the optical axis direction is folded back along the circumferential surface of the rectilinear moving member. I support them. The flexible substrate is curved in a U shape between the respective feeding step portions, and changes the position of the bending portion in the optical axis direction and the protruding amount according to the change in the feeding amount of the lens barrel. In the zoom lens barrel of Patent Document 3, the flexible substrate supported by the fixed cylinder located on the outermost diameter side is directly guided to the shutter block. In the zoom lens barrel of Patent Document 4, a flexible substrate is supported on a rectilinear guide ring that constitutes a second-stage feeding step portion with reference to a fixed cylinder, and a movable ring (fixed cylinder is received by the rectilinear guide ring). A flexible substrate is connected to a shutter block supported in a third feed stage) as a reference.

JP 2002-277707 A Japanese Patent Laid-Open No. 11-38305 JP 2006-53444 A JP 2009-192815 A

  As the number of steps of the zoom lens barrel feeding stage increases and the amount of movement of the moving part that supports the electrical components increases, the conventional structure does not restrict the operation of the zoom lens barrel and the flexible substrate is overloaded. There has been a problem that it is difficult to properly arrange with a short length. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a multistage zoom lens barrel that realizes an appropriate arrangement of flexible substrates.

  The zoom lens barrel of the present invention is a fixed cylinder; located inside the fixed cylinder and supported so as to be movable in the optical axis direction with respect to the fixed cylinder; located inside the first extension stage A second feeding step portion supported so as to be movable in the optical axis direction with respect to the first feeding step portion; located inside the second feeding step portion and moving in the optical axis direction with respect to the second feeding step portion A third feeding step portion that is supported so as to be supported; an inward moving portion that is supported so as to be movable in the optical axis direction with respect to the third feeding step portion; a flexible substrate that connects the electrical component and the control portion An imaging optical system including a plurality of variable magnification lens groups that move relative to each other in the optical axis direction to change the focal length, and has the following configuration. When operating from a stowed state where no photographing is performed to a zoom photographing range enabling photographing with the imaging optical system, the first feeding step unit, the second feeding step unit, and the third feeding step unit are respectively on the object side in the optical axis direction. Move to. When changing the focal length within the zoom shooting range, the first feeding step portion does not move in the optical axis direction with respect to the fixed cylinder, and the third feeding step portion does not move in the optical axis direction with respect to the second feeding step portion. First, the second feeding step portion moves in the optical axis direction with respect to the first feeding step portion. The second feeding stage portion includes a rotatable second stage rotating cylinder and a second stage rectilinear guide ring that is guided linearly in the optical axis direction and does not rotate. The flexible substrate includes a first support portion fixedly supported by the second stage linear guide ring, a second support portion fixedly supported by the fixed cylinder, and a first intermediate from the electrical component to the first support portion. And a second intermediate part from the first support part to the second support part, and the first intermediate part and the second intermediate part are fixed to the first feeding stage part and the third feeding stage part, respectively. Not.

  The first intermediate portion of the flexible substrate is disposed across the image plane side position in the optical axis direction of the third feeding step portion, and the second intermediate portion is the image plane in the optical axis direction of the first feeding step portion. It is good to arrange | position across a side position.

  The second-stage straight guide ring is connected to an inclined groove portion that is inclined with respect to both the optical axis direction and a circumferential direction around the optical axis, and an end of the inclined groove portion on the object side in the optical axis direction. A guide groove for three stages including a circumferential groove part extending in the direction, and guiding the movement of the third feeding step part by the guide groove for three stages, and the guide groove for three stages of the second stage rectilinear guide ring A flexible substrate support portion that fixedly supports the first support portion of the flexible substrate at an image side position in the optical axis direction with respect to the circumferential groove portion, and a flexible substrate introduction hole that penetrates the flexible substrate through the radial direction It is good to form.

  The third feeding step portion includes a guide projection that is slidably inserted into the three-step guide groove, a rotation transmission portion that transmits a rotational force from the second-stage rotating cylinder, and a plurality of magnifications. A cam cylinder having a plurality of cam grooves for guiding the movement of the lens group in the optical axis direction; guided so as to be linearly movable in the optical axis direction via the second stage linear guide ring, and moves in the optical axis direction together with the cam cylinder A guide projection of the cam barrel moves along the inclined groove portion of the guide groove for the third step when the zoom shooting range is changed from the stored state, and the guide projection of the cam barrel is moved in the zoom shooting range. The circumferential groove of the three-stage guide groove is moved.

  The fixed cylinder is connected to the inclined groove portion that is inclined with respect to both the optical axis direction and the circumferential direction around the optical axis, and the circumferential direction extending in the circumferential direction by connecting to the object side end of the inclined groove portion in the optical axis direction. A first-stage guide groove including a groove portion, and the movement of the first feeding step portion is guided by the first-stage guide groove. A flexible substrate support portion that fixedly supports the second support portion of the flexible substrate at the image side position in the optical axis direction with respect to the circumferential groove portion of the guide groove for the first step in the fixed cylinder, and is flexible by penetrating in the radial direction. A flexible substrate introduction hole for inserting the substrate may be formed.

  The first feeding step portion includes a guide protrusion that is slidably inserted into the first-stage guide groove, and a first transmission step that includes a rotation transmission portion that transmits a rotational force to the second-stage rotating cylinder. A rotating cylinder; a first-stage rectilinear guide ring that is guided so as to be linearly movable in the optical axis direction through a fixed cylinder and moves in the optical axis direction together with the first-stage rotating cylinder; The guide projection of the first stage rotary cylinder moves along the inclined groove portion of the first stage guide groove, and the guide projection of the first stage rotary cylinder moves along the circumferential groove portion of the first stage guide groove in the zoom photographing area. .

  The first stage rectilinear guide ring extends in the circumferential direction by connecting to the feeding inclined groove portion that is inclined with respect to both the optical axis direction and the circumferential direction, and the object side end portion of the feeding inclined groove portion in the optical axis direction. A first circumferential groove, an inclined groove for a zoom region that extends toward the object side in the optical axis direction from the first circumferential groove while being inclined with respect to both the optical axis direction and the circumferential direction; and a zoom region A second-stage guide groove including a second circumferential groove section that extends in the circumferential direction by connecting to the object-side end of the inclined groove section for the optical axis. A guide projection provided on the rotating cylinder is slidably inserted. When the zoom shooting range is reached from the retracted state, the guide projection of the second-stage rotating cylinder moves along the feeding inclined groove portion of the two-stage guide groove, and in the zoom shooting area, the guide projection of the second-stage rotating cylinder is for the second stage. The first circumferential groove portion, the zoom region inclined groove portion, and the second circumferential groove portion of the guide groove are moved.

  The electrical component to which the flexible substrate is connected is, for example, a shutter actuator that drives a shutter.

  The inward moving unit may support one of a plurality of variable magnification lens groups separately from the electrical component.

  According to the present invention described above, it is possible to realize an appropriate arrangement in which the length of the flexible substrate is less likely to be excessive and short in the multistage zoom lens barrel.

It is sectional drawing of the accommodation state of the zoom lens barrel to which this invention is applied. It is a disassembled perspective view of a part of component of a zoom lens barrel. It is a disassembled perspective view of a part of component of a zoom lens barrel. It is a disassembled perspective view of a part of component of a zoom lens barrel. It is a disassembled perspective view of a part of component of a zoom lens barrel. It is a disassembled perspective view of a part of component of a zoom lens barrel. FIG. 6 is an upper half sectional view of a zoom lens barrel in a stored state. It is an upper half sectional view at the wide end of the zoom lens barrel. It is an upper half sectional view at the tele end of the zoom lens barrel. It is an expansion | deployment top view of a fixed cylinder. It is an expansion | deployment top view of a 1st rectilinear guide ring. It is an expansion | deployment top view of a 2nd rectilinear advance guide ring. It is a development top view showing the relation between the 1st straight guide ring and the 1st delivery cylinder, (A) is a stowed state, (B) is a delivery start state, (C) is a wide end, (D) is a tele end. It is a relationship. It is an expansion | deployment top view which shows the relationship between a 2nd rectilinear guide ring and a 2nd delivery cylinder, (A) is a stowed state, (B) is a delivery start state, (C) is a wide end, (D) is a tele end. It is a relationship. It is a perspective view which shows the cam cylinder and 2nd lens group frame in the accommodation state. It is the figure which looked at the cam cylinder and 2nd lens group frame in the accommodation state from the optical axis direction back. It is a perspective view which shows the cam cylinder and the 2nd lens group frame in the middle of the extension or accommodation operation | movement of a zoom lens barrel. It is the figure which looked at the cam cylinder and the 2nd lens group frame in the middle of the extension or accommodation operation of a zoom lens barrel from the optical axis direction back. It is a perspective view which shows the cam cylinder and 2nd lens group frame in an imaging | photography state. It is the figure which looked at the cam cylinder and 2nd lens group frame in imaging | photography state from the optical axis direction back. It is a perspective view which shows a part of back plate in the accommodation state, the 2nd lens group frame, and the retracting lever. It is a block diagram which shows notionally a part of electrical system of a zoom lens barrel. It is the side view which showed the shape change of the flexible substrate for shutters accompanying the operation | movement of a zoom lens barrel, (A) is a stowed state, (B) is a wide end, (C) is a shape in a tele end.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The zoom lens barrel 1 of the present embodiment is attached to a camera body (not shown). In the shooting state shown in FIGS. 8 and 9, the first lens group LG1 and the shutter S are sequentially arranged from the object (subject) side. The imaging optical system is configured by the optical elements of the second lens group LG2, the third lens group LG3, the optical filter 21 (for example, an infrared cut filter), and the imaging element 20. A protective glass 4 is provided in front of the first lens group LG1. In the following description, the object side in the direction along the optical axis O of the imaging optical system is referred to as the front, and the image side is referred to as the rear. The optical axis direction means a direction parallel to the optical axis O (a direction along the optical axis O).

  The zoom lens barrel 1 has a fixed tube 9 and a back plate 23 as fixed members, and the back plate 23 is fixed to the rear portion of the fixed tube 9. The optical filter 21 and the image sensor 20 are fixed to the back plate 23 in a unitized state with the packing 22 interposed therebetween (see FIG. 2).

  The third lens group LG3 is supported by the third lens group frame 6. As shown in FIG. 2, the third lens group frame 6 has a pair of support arm portions 6b and 6c protruding in the outer diameter direction from a lens support cylinder 6a in which the third lens group LG3 is inserted and fixed. The front and rear ends of the third group guide shaft 50 (FIG. 3) with the axis line in the optical axis direction are fixed to the fixed cylinder 9 and the back plate 23, and the third lens group frame 6 is the tip of one support arm 6b. A guide shaft 50 is inserted into a guide hole formed in the vicinity, and is supported through the guide shaft 50 so as to be able to move straight in the optical axis direction. By inserting a protrusion formed at the tip of the other support arm portion 6c of the third lens group frame 6 into a rotation restricting groove (not shown in the figure) formed inside the fixed cylinder 9 and extending in the optical axis direction. The rotation of the third lens group frame 6 is restricted. As shown in FIG. 3, a third group biasing spring 51 and a focus motor unit 25 are supported on the fixed cylinder 9. The focus motor unit 25 includes a focus motor 25a and a nut 25b that is moved in the optical axis direction by the driving force of the focus motor 25a. The third lens group frame 6 is urged forward in the optical axis direction by the third group urging spring 51 and is in contact with the nut 25b. When the focus motor 25a is driven to move the nut 25b in the optical axis direction, the third lens group frame 6 moves in the optical axis direction in accordance with a change in the position of the nut 25b.

  On the inner side of the fixed cylinder 9, in addition to the third lens group frame 6 driven by the focus motor unit 25, a multistage that operates in the optical axis direction with respect to the fixed cylinder 9 using a zoom motor unit 26 (FIG. 2). The feeding step portion is supported. As shown in FIG. 2, the zoom motor unit 26 includes a zoom motor 26a, a zoom gear 26b, and a gear box 26c. The zoom gear 26b rotates the output shaft of the zoom motor 26a via a gear train in the gear box 26c. To communicate. The zoom gear 26 b is a long gear whose axis is directed in the optical axis direction, and is supported by the fixed cylinder 9 and the back plate 23. The zoom motor 26 a and the gear box 26 c are fixed to the fixed cylinder 9.

  A motor flexible substrate 52 (FIG. 3) is connected to the focus motor 25a and the zoom motor 26a. The motor flexible substrate 52 is connected to a control unit 60 (FIG. 22) that controls the zoom lens barrel 1, and the control unit 60 controls driving of the focus motor 25a and the zoom motor 26a.

  A plurality of guide grooves (a one-step guide groove) 9a and a plurality of rectilinear guide grooves 9b are formed on the inner peripheral surface of the fixed cylinder 9 at different positions in the circumferential direction. Three guide grooves 9a are provided, and one of them is shown in FIGS. As can be seen from FIG. 10, the guide groove 9a includes, in order from the rear in the optical axis direction, a first horizontal portion 9a-1, a lead portion (inclined groove portion) 9a-2, and a second horizontal portion (circumferential groove portion) 9a-3. have. The first horizontal portion 9a-1 and the second horizontal portion 9a-3 are grooves extending in the circumferential direction around the optical axis O, and the lead portion 9a-2 is inclined with respect to both the optical axis direction and the circumferential direction. It is a spiral groove. The rectilinear guide groove 9b is a linear groove extending in the optical axis direction. At the rear end portion of the first horizontal portion 9a-1, an opening portion 9a-4 for opening the guide groove 9a to the rear end surface of the fixed cylinder 9 is formed.

  The fixed cylinder 9 is further formed with a flexible substrate introduction hole 9c. As shown in FIG. 10, the flexible substrate introduction hole 9c is located between the two rectilinear guide grooves 9b in the circumferential direction, and is located behind the second horizontal portion 9a-3 of the guide groove 9a in the optical axis direction. ing. A flat-shaped flexible substrate support portion 9d is formed behind the flexible substrate introduction hole 9c in the optical axis direction.

  A first feeding cylinder (first feeding step portion, first stage rotating cylinder) 10 is positioned inside the fixed cylinder 9. A peripheral gear 10a (see FIGS. 1 and 7 to 9) that meshes with the zoom gear 26b is formed on the outer peripheral surface in the vicinity of the rear end of the first feeding cylinder 10, and a plurality (three) of them are directed toward the outer diameter direction. The guide protrusions 10b are provided in different positions in the circumferential direction. Each guide projection 10b is slidably inserted into the guide groove 9a of the fixed cylinder 9. More specifically, as shown in FIG. 10, the guide protrusion 10b has a pair of circumferential surfaces 10b-1 extending in the circumferential direction around the optical axis O in the front and rear, and the lead portion 9a-2 of the guide groove 9a. A pair of lead surfaces 10b-2 that are inclined substantially in parallel with each other are provided on both sides in the circumferential direction. When the guide protrusion 10b is positioned on the first horizontal portion 9a-1 and the second horizontal portion 9a-3 of the guide groove 9a, the pair of circumferential surfaces 10b-1 are the first horizontal portion 9a-1 and the second horizontal portion 9a. The guide protrusion 10b is guided so as to be movable in the circumferential direction upon receiving guidance from a pair of opposing surfaces that constitute -3. That is, the first feeding cylinder 10 performs fixed position rotation that does not change the position in the optical axis direction with respect to the fixed cylinder 9. When the guide protrusion 10b is positioned in the lead portion 9a-2 of the guide groove 9a, the pair of lead surfaces 10b-2 receives guidance from the pair of opposing surfaces constituting the lead portion 9a-2, and the guide protrusion 10b is the lead portion. It is guided so as to be movable along 9a-2. That is, the first feeding cylinder 10 performs forward / backward rotation that changes the position in the optical axis direction with respect to the fixed cylinder 9. Each guide projection 10b is inserted into the corresponding guide groove 9a through the opening 9a-4 in the assembly process of the zoom lens barrel 1.

  A plurality of coupling grooves 10 c and a plurality of linkage grooves (rotation transmission portions) 10 d are formed on the inner peripheral surface of the first feeding cylinder 10. As shown in FIGS. 7 to 9, the coupling grooves 10c are formed at two positions with different positions in the optical axis direction, and each coupling groove 10c is a groove portion extending in the circumferential direction. Three linkage grooves 10d are provided at different positions in the circumferential direction, and one of them is shown in FIGS. As shown in FIG. 13, the linkage groove 10d has a bent shape including an introduction portion 10d-1, a horizontal portion 10d-2, and a rotation transmission portion 10d-3 in order from the rear in the optical axis direction. The introduction part 10d-1 and the rotation transmission part 10d-3 are grooves extending in the optical axis direction, and the horizontal part 10d-2 is a groove extending in the circumferential direction around the optical axis O. The introduction portion 10d-1 is open at the rear end surface of the first feeding cylinder 10.

  A first rectilinear guide ring (first payout step portion, first step rectilinear guide ring) 11 is located inside the first feed cylinder 10. As shown in FIG. 4, near the rear end of the first rectilinear guide ring 11, a plurality of rectilinear guide protrusions 11a projecting in the outer diameter direction are provided at different positions in the circumferential direction. Each rectilinear guide protrusion 11 a is slidably inserted into the rectilinear guide groove 9 b of the fixed cylinder 9. The first rectilinear guide ring 11 is provided with a plurality of coupling projections 11b on the outer peripheral surface in front of the rectilinear guide projection 11a. Each coupling projection 11b slides with respect to the coupling groove 10c of the first feeding cylinder 10. It is inserted movably. The first rectilinear guide ring 11 is guided so as to be linearly movable in the optical axis direction by the relationship between the rectilinear guide protrusion 11a and the rectilinear guide groove 9b. The first rectilinear guide ring 11 is also coupled so as to be relatively rotatable with respect to the first feeding cylinder 10 and to move together in the optical axis direction due to the relationship between the coupling protrusion 11b and the coupling groove 10c.

  A plurality of rectilinear guide grooves 11c extending in the optical axis direction are formed on the inner peripheral surface of the first rectilinear guide ring 11 at different positions in the circumferential direction. The first straight guide ring 11 is formed with a plurality of guide grooves (dual guide grooves) 11d penetrating in the radial direction. As shown in FIG. 4, three guide grooves 11d are provided at different positions in the circumferential direction. As shown in FIGS. 11 and 13, the guide groove 11d includes, in order from the rear in the optical axis direction, a first lead portion (feeding inclined groove portion) 11d-1, a second lead portion (feeding inclined groove portion) 11d-2, A first horizontal portion (first circumferential groove portion) 11d-3, a third lead portion (zoom region inclined groove portion) 11d-4, and a second horizontal portion (second circumferential groove portion) 11d-5 are provided. Yes. At the rear end portion of the first lead portion 11d-1, an opening portion 11d-6 that opens the guide groove 11d to the rear end surface of the first rectilinear guide ring 11 is formed. The first horizontal portion 11d-3 and the second horizontal portion 11d-5 are groove portions extending in the circumferential direction around the optical axis O, and the first lead portion 11d-1, the second lead portion 11d-2, and the third lead. The portion 11d-4 is a spiral groove portion that is inclined with respect to both the optical axis direction and the circumferential direction. The second lead portion 11d-2 and the third lead portion 11d-4 have substantially the same inclination angle, and only the first lead portion 11d-1 has a different inclination angle. Specifically, the first lead portion 11d-1 has a smaller inclination angle with respect to the optical axis direction and a larger inclination angle with respect to the circumferential direction than the second lead portion 11d-2 and the third lead portion 11d-4.

  A second feeding cylinder (second feeding stage part, second stage rotating cylinder) 12 is positioned inside the first straight guide ring 11. Near the rear end of the second feeding cylinder 12, a plurality of guide protrusions 12a projecting in the outer diameter direction are provided at different positions in the circumferential direction. Three guide protrusions 12a are provided, two of which appear in FIG. Each guide protrusion 12a is slidably inserted into the guide groove 11d of the first rectilinear guide ring 11. More specifically, as shown in FIGS. 11 and 13, the guide protrusion 12 a has a pair of circumferential surfaces 12 a-1 extending in the circumferential direction around the optical axis O, and the first guide groove 11 d has a first groove. A pair of lead surfaces 12a-2 inclined substantially parallel to the lead portion 11d-1, and a pair of lead surfaces 12a inclined substantially parallel to the second lead portion 11d-2 and the third lead portion 11d-4 of the guide groove 11d. -3 on both sides in the circumferential direction. When the guide protrusion 12a is positioned in the first horizontal portion 11d-3 and the second horizontal portion 11d-5 of the guide groove 11d as shown in FIGS. 13C and 13D, a pair of circumferential surfaces 12a-1 is provided. Is guided by a pair of opposing surfaces constituting the first horizontal portion 11d-3 and the second horizontal portion 11d-5, and the guide protrusion 12a is guided to be movable in the circumferential direction. That is, the second feeding cylinder 12 performs fixed position rotation that does not change the position in the optical axis direction with respect to the first rectilinear guide ring 11. When the guide protrusion 12a is positioned on the first lead portion 11d-1 of the guide groove 11d as shown in FIGS. 13A and 13B, the pair of lead surfaces 12a-2 defines the first lead portion 11d-1. The guide projection 12a is guided so as to be movable along the first lead portion 11d-1 upon receiving guidance from a pair of opposing surfaces. That is, the second feeding cylinder 12 performs forward / backward rotation that changes the position in the optical axis direction with respect to the first rectilinear guide ring 11. Further, when the guide protrusion 12a is positioned on the second lead portion 11d-2 and the third lead portion 11d-4 of the guide groove 11d, the pair of lead surfaces 12a-3 are formed on the second lead portion 11d-2 and the third lead portion. The guide projection 12a is guided so as to be movable along the second lead portion 11d-2 and the third lead portion 11d-4 upon receiving guidance from a pair of opposing surfaces constituting 11d-4. That is, the second feeding cylinder 12 performs forward / backward rotation that changes the position in the optical axis direction with respect to the first rectilinear guide ring 11. Note that the guide protrusion 12a is guided by the second lead portion 11d-2 and the third lead portion 11d-4 by the change in the inclination angle (lead angle) of the guide groove 11d with respect to the rotation direction of the second feeding cylinder 12. However, when the guide protrusion 12a is guided to the first lead portion 11d-1, the amount of movement in the optical axis direction per unit rotation angle of the second feeding cylinder 12 becomes larger. Each guide protrusion 12a is inserted into the corresponding guide groove 11d through the opening 11d-6 in the assembly process of the zoom lens barrel 1.

  A rotation transmission protrusion 12b protrudes from each guide protrusion 12a of the second feeding cylinder 12 toward the outer diameter direction. The same number of rotation transmission protrusions 12b as the guide protrusions 12a (two appearing in FIG. 4) are provided at different positions in the circumferential direction, and each rotation transmission protrusion 12b is provided on the first feeding cylinder 10. It is slidably located in the linkage groove 10d. Each rotation transmission protrusion 12b is inserted into the linkage groove 10d through the introduction part 10d-1 in the assembly process of the zoom lens barrel 1. When the rotation transmitting projection 12b is positioned at the horizontal portion 10d-2 of the linkage groove 10d as shown in FIG. 13A, the rotation of the first feeding cylinder 10 is not transmitted to the second feeding cylinder 12, and FIG. ) Or FIG. 13D, when the rotation transmitting projection 12b is positioned at the rotation transmitting portion 10d-3 of the linkage groove 10d, the rotation of the first feeding cylinder 10 is transmitted to the second feeding cylinder 12 and the first The feeding cylinder 10 and the second feeding cylinder 12 rotate together.

  A plurality of coupling grooves 12 c and a plurality of linkage grooves 12 d are formed on the inner peripheral surface of the second feeding cylinder 12. The coupling grooves 12c are formed at two positions with different positions in the optical axis direction, and each coupling groove 12c is a groove portion extending in the circumferential direction. Three linkage grooves 12d are provided at different positions in the circumferential direction, and one of them is shown in FIGS. As shown in FIG. 14, the linkage groove 12d has an introduction part 12d-1, a horizontal part 12d-2, and a rotation transmission part 12d-3 in order from the rear in the optical axis direction. The introduction part 12d-1 and the rotation transmission part 12d-3 are grooves extending in the optical axis direction, and the horizontal part 12d-2 is a groove extending in the circumferential direction around the optical axis O. The introduction portion 12d-1 is open to the rear end surface of the second feeding cylinder 12.

  A second rectilinear guide ring (second feed step portion, second stage rectilinear guide ring) 13 is located inside the second feed cylinder 12. As shown in FIG. 4, near the rear end of the second rectilinear guide ring 13, a plurality of rectilinear guide protrusions 13a projecting in the outer diameter direction are provided at different positions in the circumferential direction. Each rectilinear guide protrusion 13 a is slidably inserted into the rectilinear guide groove 11 c of the first rectilinear guide ring 11. The second rectilinear guide ring 13 is provided with a plurality of coupling projections 13b on the outer peripheral surface in front of the rectilinear guide projection 13a, and each coupling projection 13b slides with respect to the coupling groove 12c of the second feeding cylinder 12. It is inserted movably. The second rectilinear guide ring 13 is guided so as to be linearly movable in the optical axis direction by the relationship between the rectilinear guide protrusion 13a and the rectilinear guide groove 11c. The second rectilinear guide ring 13 is also coupled so as to be relatively rotatable with respect to the second feeding cylinder 12 and to move together in the optical axis direction due to the relationship between the coupling protrusion 13b and the coupling groove 12c.

  A plurality of rectilinear guide grooves 13 c extending in the optical axis direction are formed on the inner peripheral surface of the second rectilinear guide ring 13 at different positions in the circumferential direction. The second rectilinear guide ring 13 is formed with a plurality of guide grooves (three-stage guide grooves) 13d penetrating in the radial direction. As shown in FIG. 4, three guide grooves 13d are provided at different positions in the circumferential direction. As shown in FIGS. 12 and 14, the guide groove 13d has a lead portion (inclined groove portion) 13d-1 and a horizontal portion (circumferential groove portion) 13d-2 in order from the rear in the optical axis direction. At the rear end portion of the lead portion 13d-1, an opening portion 13d-3 that opens the guide groove 13d to the rear end surface of the second rectilinear guide ring 13 is formed. The lead portion 13d-1 is a spiral groove portion that is inclined with respect to both the optical axis direction and the circumferential direction, and the horizontal portion 13d-2 is a groove portion that extends in the circumferential direction around the optical axis O.

  The second straight guide ring 13 is further formed with a flexible board introduction hole 13e. As shown in FIG. 12, the flexible substrate introduction hole 13e is located between the two rectilinear guide grooves 13c in the circumferential direction, and is located behind the horizontal portion 13d-2 of the guide groove 13d in the optical axis direction. . A flat-shaped flexible substrate support portion 13f is formed at the rear portion of the flexible substrate introduction hole 13e. The plurality of coupling protrusions 13b are formed at positions that do not overlap the flexible substrate introduction hole 13e and the flexible substrate support portion 13f.

  A cam cylinder (third feeding step) 17 is located inside the second straight guide ring 13. Near the rear end of the cam cylinder 17, a plurality of guide protrusions 17a projecting in the outer diameter direction are provided at different positions in the circumferential direction. Three guide protrusions 17a are provided, two of which appear in FIG. Each guide protrusion 17a is slidably inserted into the guide groove 13d of the second rectilinear guide ring 13. More specifically, as shown in FIG. 12, the guide protrusion 17a has a pair of circumferential surfaces 17a-1 extending in the circumferential direction centered on the optical axis O, and the lead portion 13d-1 of the guide groove 13d. And a pair of lead surfaces 17a-2 inclined substantially parallel to each other on both sides in the circumferential direction. When the guide protrusion 17a is positioned in the horizontal portion 13d-2 of the guide groove 13d, the pair of circumferential surfaces 17a-1 receives guidance from the pair of opposed surfaces constituting the horizontal portion 13d-2, and the guide protrusion 17a is rotated around the guide portion 17a. Guided to move in the direction. That is, the cam cylinder 17 rotates at a fixed position without changing the position in the optical axis direction with respect to the second rectilinear guide ring 13. When the guide protrusion 17a is positioned on the lead portion 13d-1 of the guide groove 13d as shown in FIGS. 14A and 14B, the pair of lead surfaces 17a-2 forms a pair of lead portions 13d-1. Upon receiving guidance from the opposing surface, the guide protrusion 17a is guided so as to be movable along the lead portion 13d-1. That is, the cam cylinder 17 performs forward / backward rotation that changes the position in the optical axis direction with respect to the second rectilinear guide ring 13. Each guide protrusion 17a is inserted into the corresponding guide groove 13d through the opening 13d-3 in the assembly process of the zoom lens barrel 1.

  A rotation transmission protrusion (rotation transmission portion) 17b protrudes further from each guide protrusion 17a of the cam cylinder 17 in the outer diameter direction. The rotation transmission projections 17b are provided in the same number as the guide projections 17a (two appearing in FIG. 4) with different positions in the circumferential direction, and each rotation transmission projection 17b is provided on the second feeding cylinder 12. It is slidably located in the linkage groove 12d. Each rotation transmission protrusion 17b is inserted into the linkage groove 12d through the introduction portion 12d-1 in the assembly process of the zoom lens barrel 1. When the rotation transmitting projection 17b is positioned at the horizontal portion 12d-2 of the linkage groove 12d as shown in FIG. 14 (A), the rotation of the second feeding cylinder 12 is not transmitted to the cam cylinder 17, and FIG. When the rotation transmitting projection 17b is positioned at the rotation transmitting portion 12d-3 of the linking groove 12d as shown in FIG. 14D, the rotation of the second feeding cylinder 12 is transmitted to the cam cylinder 17 and the second feeding cylinder 12 and The cam cylinder 17 rotates together.

  A coupling groove 17 c extending in the circumferential direction is formed inside the cam cylinder 17, and a coupling groove 17 d extending in the circumferential direction is formed outside the cam cylinder 17. A plurality of first-group cam grooves CG1 are formed on the outer peripheral surface of the cam cylinder 17, and a plurality of second-group cam grooves CG2 are formed on the inner peripheral surface of the cam cylinder 17. Four first-group cam grooves CG1 are formed at different positions in the circumferential direction. Three groups of cam grooves CG2 for the second group are formed in different positions in the circumferential direction, and each group is constituted by three partial cam grooves that constitute different areas of the locus of the cam groove CG2 for the second group. Has been. The coupling groove 17c and the coupling groove 17d are formed in a region on the rear side in the optical axis direction that does not interfere with the first group cam groove CG1 and the second group cam groove CG2 in the cam cylinder 17.

  A third rectilinear guide ring (a third feeding step portion, a third step rectilinear guide ring) 15 is located inside the cam cylinder 17. As shown in FIG. 5, near the rear end of the third rectilinear guide ring 15, a plurality of rectilinear guide protrusions 15a projecting in the outer diameter direction are provided at different positions in the circumferential direction. Each rectilinear guide protrusion 15 a is slidably inserted into the rectilinear guide groove 13 c of the second rectilinear guide ring 13. The third rectilinear guide ring 15 is provided with a plurality of coupling projections 15b on the outer peripheral surface in front of the rectilinear guide projection 15a, and each coupling projection 15b is slidable with respect to the coupling groove 17c of the cam cylinder 17. Inserted into. The third rectilinear guide ring 15 is guided so as to be linearly movable in the optical axis direction by the relationship between the rectilinear guide protrusion 15a and the rectilinear guide groove 13c. The third rectilinear guide ring 15 is also coupled so as to be relatively rotatable with respect to the cam cylinder 17 and to move together in the optical axis direction by the relationship between the coupling protrusion 15b and the coupling groove 17c. The third rectilinear guide ring 15 is formed with a pair of key protrusions 15c protruding forward in the optical axis direction. A rectilinear guide groove 15d extending in the optical axis direction is formed inside each key protrusion 15c (FIG. 5).

  A second group support ring 18 is further located inside the cam cylinder 17. The second group support ring 18 has a pair of key grooves 18a extending in the optical axis direction, and linear guide protrusions 18b are formed in the key grooves 18a (FIG. 5). The key protrusion 15c of the third rectilinear guide ring 15 is inserted into each key groove 18a, and the rectilinear guide protrusion 18b in the key groove 18a is slidably inserted into the rectilinear guide groove 15d of the key protrusion 15c. On the outer peripheral surface of the second group support ring 18, a plurality of cam followers CF <b> 2 that are slidably inserted into the second group cam groove CG <b> 2 of the cam cylinder 17 are provided. Three sets of cam followers CF2 are provided at different positions in the circumferential direction. As shown in FIG. 5, each set of cam followers CF2 includes three protrusions having different positions in the optical axis direction. The second group support ring 18 is guided so as to be linearly movable in the optical axis direction via the straight guide protrusion 18b and the straight guide groove 15d, and the position of the cam follower CF2 in the second group cam groove CG2 by the rotation of the cam cylinder 17 Changes, the second group support ring 18 moves relative to the cam cylinder 17 in the optical axis direction.

  A third feed cylinder (a third feed step portion, a third-stage straight guide ring) 14 is positioned at a radial position between the second straight guide ring 13 and the cam cylinder 17. As shown in FIG. 4, a plurality of rectilinear guide protrusions 14 a protruding in the outer diameter direction are provided in the vicinity of the rear end of the third feeding cylinder 14 at different positions in the circumferential direction. Each rectilinear guide protrusion 14 a is slidably inserted into the rectilinear guide groove 13 c of the second rectilinear guide ring 13. A plurality of coupling projections 14 b projecting in the inner diameter direction are provided near the rear end of the third feeding cylinder 14, and each coupling projection 14 b is slidably inserted into the coupling groove 17 d of the cam cylinder 17. The third feeding cylinder 14 is guided so as to be linearly movable in the optical axis direction by the relationship between the rectilinear guide protrusion 14a and the rectilinear guide groove 13c. The third feeding cylinder 14 is also coupled so as to be relatively rotatable with respect to the cam cylinder 17 and move together in the optical axis direction by the relationship between the coupling protrusion 14b and the coupling groove 17d. A plurality of rectilinear guide grooves 14c extending in the optical axis direction are formed on the inner peripheral surface of the third feeding cylinder 14 at different positions in the circumferential direction.

  A fourth feeding cylinder 16 is located at a radial position between the third feeding cylinder 14 and the cam cylinder 17. As shown in FIG. 6, a plurality of rectilinear guide protrusions 16 a that protrude in the outer diameter direction are provided in the vicinity of the rear end of the fourth feeding cylinder 16 at different positions in the circumferential direction. Each rectilinear guide protrusion 16a is slidably inserted into the rectilinear guide groove 14c of the third feeding cylinder 14. A plurality of cam followers CF <b> 1 that are slidably inserted into the first group cam groove CG <b> 1 of the cam cylinder 17 project from the fourth feeding cylinder 16 toward the inner diameter direction. As shown in FIG. 6, four cam followers CF1 are provided at different positions in the circumferential direction. The fourth feed cylinder 16 is guided through the rectilinear guide groove 14c and the rectilinear guide projection 16a so as to be movable in the optical axis direction, and the cam follower CF1 is positioned in the first group cam groove CG1 by the rotation of the cam cylinder 17. Changes, the fourth feeding cylinder 16 moves relative to the cam cylinder 17 in the optical axis direction.

  As can be seen from the above configuration, the zoom lens barrel 1 has four appearance cylinders (a first feeding cylinder 10, a second feeding cylinder 12, and a third feeding cylinder 14) that perform a feeding operation in stages with respect to the fixed barrel 9. , A fourth feed barrel 16) having a fourth feed barrel 16). The first feeding cylinder 10 and the first rectilinear guide ring 11 that move integrally in the optical axis direction with respect to the fixed cylinder 9 constitute a first feeding step portion, and the optical axis direction with respect to the first feeding step portion. The second feeding cylinder 12 and the second rectilinear guide ring 13 that move integrally with each other constitute a second feeding step portion, and the third feeding portion that moves integrally in the optical axis direction with respect to the second feeding step portion. The cylinder 14, the third rectilinear guide ring 15 and the cam cylinder 17 constitute a third feeding step portion, and the fourth feeding tube 16 which moves relative to the third feeding step portion in the optical axis direction is the fourth feeding step. Configure the step. The second group support ring 18 constitutes an inward moving portion that moves in the optical axis direction along a locus different from that of the fourth feeding cylinder 16 (fourth feeding step portion) inside the third feeding step portion.

  The first lens group LG1 is fixedly supported in a lens support tube 16b formed inside the fourth feed tube 16. The protective glass 4 is fixedly supported on the front end portion of the fourth feeding cylinder 16, and the protective glass 4 covers and protects the front of the first lens group LG1.

  Inside the second group support ring 18, a shutter block (electrical part) 7 having a shutter S is fixedly supported, and the second lens group LG2 is movably supported. The shutter block 7 incorporates a shutter actuator (electric part) 7a (FIG. 22) that drives the shutter S to open and close. The shutter flexible substrate 8 extending from the shutter block 7 is connected to the control unit 60 (FIG. 22), and a control signal is sent to the shutter block 7 via the shutter flexible substrate 8.

  A support structure of the second lens group LG2 in the second group support ring 18 will be described. A support frame 30 (FIG. 6) is fixed inside the second group support ring 18 at the rear of the shutter block 7 in the optical axis direction, and is shaken at a position in the optical axis direction between the shutter block 7 and the support frame 30. The frame 31 (FIG. 6) is supported. A plurality of guide balls 32 (FIG. 6) are sandwiched between the vibration isolation frame 31 and the support frame 30, and the vibration isolation frame 31 is along a plane perpendicular to the optical axis O with respect to the support frame 30. And is supported movably. The anti-vibration frame 31 is urged in a direction approaching the support frame 30 by a plurality of tension springs 33 (FIG. 6), and the clamping state of the guide ball 32 is maintained by the urging force of the tension springs 33. A pair of permanent magnets 34 (FIG. 6) is fixed to the vibration isolation frame 31, and a pair of coils 35 (FIG. 22) is provided on the shutter block 7 at positions facing the pair of permanent magnets 34. Each coil 35 is energized and controlled by the control unit 60 (FIG. 22) via the shutter flexible substrate 8. Each permanent magnet 34 and each coil 35 constitute a voice coil motor, and the vibration isolation frame 31 can be moved along a plane orthogonal to the optical axis O by a thrust generated when each coil 35 is energized.

  A support shaft 36 (FIG. 6) whose axis is oriented in the optical axis direction is fixed to the vibration isolation frame 31, and the second lens group frame 5 is supported so as to be able to swing (reciprocate) around the support shaft 36. Yes. As shown in FIGS. 6 and 15 to 21, the second lens group frame 5 has a shaft hole 5b for inserting the support shaft 36 at one end of the support arm portion 5a, and the second lens group frame 5 at the other end of the support arm portion 5a. A lens support cylinder 5c into which the two lens group frame 5 is inserted is provided. The lens support cylinder 5b is provided with a positioning piece 5d protruding in a direction different from that of the support arm 5a. The support arm 5a is provided with a pressed protrusion 5e that protrudes rearward in the optical axis direction.

  The second lens group frame 5 has an insertion position (FIGS. 8, 9, 19, and 20) where the second lens group LG2 is inserted on the optical axis O, and the second lens group LG2 is separated from the optical axis O. It can be swung between the retracted position (FIGS. 1, 15, and 16) to be moved, and the positioning piece 5d is brought into contact with a stopper (not shown) provided on the vibration isolation frame 31. The insertion position is determined. The second lens group frame 5 is biased toward the insertion position (counterclockwise in FIGS. 16, 18, and 20) by a biasing spring 37 (FIG. 6).

  As shown in FIG. 5, a penetrating portion 18 c that penetrates in the radial direction is formed in the second group support ring 18, and a storage recess 17 e is formed inside the cam cylinder 17. Since the second group support ring 18 is guided in a straight line in the optical axis direction, the penetrating portion 18c is always at a constant circumferential position. On the other hand, when the cam cylinder 17 rotates, the circumferential positional relationship (rotational direction position) of the storage recess 17e with respect to the through-hole 18c changes. Further, the relative relationship in the optical axis direction of the second group support ring 18 with respect to the cam cylinder 17 changes the positional relationship in the optical axis direction of the housing recess 17e with respect to the through portion 18c. In the retracted (collapsed) state of the zoom lens barrel 1 shown in FIGS. 1 and 7, the mutual positions of the storage recess 17e and the through portion 18c coincide with each other in the circumferential direction and the optical axis direction. The relationship 18c communicates in the radial direction of the zoom lens barrel 1. When the second lens group frame 5 moves to the retracted position in this state, a part of the lens support cylinder 5c enters the housing recess 17e through the through portion 18c (see FIGS. 15 and 16).

  A retraction lever 27 is supported on the second group support ring 18 so as to be swingable about a support shaft (not shown in the drawing) whose axis is directed in the optical axis direction. As shown in FIGS. 5 and 15 to 21, the retracting lever 27 includes a shaft hole 27 a into which the support shaft is inserted, a pressed portion 27 b positioned in the vicinity of the shaft hole 27 a, and the vicinity of the tip away from the shaft hole 27 a. And a pressing portion 27c located at the center. There is a pressed protrusion 5e of the second lens group frame 5 on the locus of the pressing portion 27c when the retracting lever 27 is rotated, and the retracting lever 27 is pressed from the pressed protrusion 5e by the biasing spring 39 (FIG. 5). The portion 27c is biased toward the direction in which the portion 27c is separated (the counterclockwise direction in FIGS. 16, 18, and 20). Although not shown, the second group support ring 18 is provided with a stopper for determining the moving end of the retracting lever 27 in the urging direction by the urging spring 39, which is counterclockwise than the position shown in FIG. The rotation of the retracting lever 27 in the direction is restricted by the stopper. The position of the retracting lever 27 regulated by this stopper is referred to as an insertion allowable position. At the insertion allowable position, the pressing portion 27c is separated from the pressed protrusion 5e of the second lens group frame 5 at the insertion position (see FIG. 20).

  As shown in FIGS. 2 and 21, a cam projection 38 is formed on the rear plate 23 so as to protrude from the side of the portion supporting the imaging device 20 and the optical filter 21 toward the front in the optical axis direction. A cam surface 38a is formed at the tip of the cam projection 38, and the cam surface of the cam projection 38 is moved when the second group support ring 18 moves to a predetermined position rearward in the optical axis direction with the retracting lever 27 in the insertion allowable position. 38 a comes into contact with the pressed portion 27 b of the retracting lever 27. When the second group support ring 18 is further moved rearward in the optical axis direction from this predetermined position, the retraction lever 27 is opposed to the urging force of the urging spring 39 by the inclination of the cam surface 38a (see FIGS. 16, 18, and 20). A component force to be pressed in the clockwise direction is generated. With this component force, the retracting lever 27 is rotated from the insertion allowable position, the pressing portion 27c is brought into contact with the pressed protrusion 5e, and the second lens group frame 5 is pressed from the inserting position toward the retracting position (FIG. 17, FIG. 18).

  When the second group support ring 18 moves a predetermined distance or more rearward in the optical axis direction, the pressed portion 27b rides on the side surface 38b of the cam projection 38 as shown in FIG. 21, and the retraction lever 27 is moved in the urging direction by the urging spring 39. The rotation is restricted. The position of the retraction lever 27 at this time is called a retraction holding position. When the retracting lever 27 is in the retracted holding position, the second lens group frame 5 is held in the retracted position.

  In the zoom lens barrel 1 having the above structure, when a feeding signal is input from the control unit 60 (FIG. 22) in the retracted (collapsed) state shown in FIGS. 1 and 7, the zoom motor 26a is driven first. The four feeding steps described are drawn forward from the fixed tube 9 in the optical axis direction to enter the photographing state. When the zoom lens barrel 1 is extended from the housed state to the photographing state, first, the wide end state shown in FIG. 8 is obtained. In the photographing state, the zoom motor 26a is driven to move the first lens group LG1 and the second lens group LG2 along a predetermined locus in the optical axis direction, and between the wide end shown in FIG. 8 and the tele end shown in FIG. The focal length of the photographic optical system can be changed.

  The operation of the zoom lens barrel 1 will be described in more detail. 10 to 12, R, W, and T indicate the retracted state of the zoom lens barrel 1, and the positions (circumferential positions) of the guide protrusions 10b, 12a, and 17a at the wide end and the tele end, respectively. It is.

  1 and 7, the retracting lever 27 is held at the retracted holding position by the cam projection 38, and the second lens group frame 5 is held at the retracted position by the retracting lever 27 (FIGS. 15, 16, and 16). FIG. 21). As shown in FIGS. 1 and 7, in the retracted state, the third lens group LG3 and the third lens group LG3 are placed in the space on the optical axis O in the second group support ring 18 obtained by moving the second lens group frame 5 to the retracted position. The imaging element 20 has entered, and the zoom lens barrel 1 is thinned in the optical axis direction. The second lens group frame 5 held in the retracted position allows the lens support cylinder 5c to enter the through-hole 18c of the second-group support ring 18, and further the lens to the storage recess 17e of the cam cylinder 17 positioned outside the through-hole 18c. Part of the support cylinder 5c has entered (FIGS. 15 and 16). Thereby, the retreat space of the second lens group frame 5 can be obtained without increasing the diameter of the second group support ring 18 and the cam cylinder 17, and the zoom lens barrel 1 is prevented from being enlarged in the radial direction.

  When the zoom lens barrel 1 is extended from the retracted state, the zoom motor 26a is driven to transmit the rotational force from the zoom gear 26b to the peripheral gear 10a of the first extension cylinder 10. As shown in FIG. 10, in the housed state, the guide protrusion 10b of the first feeding cylinder 10 is located at the first horizontal portion 9a-1 of the guide groove 9a of the fixed cylinder 9 (the R position in FIG. 10), and the guide The circumferential surface 10b-1 of the protrusion 10b receives the guidance of the first horizontal portion 9a-1, so that the first feeding cylinder 10 rotates at a fixed position without changing the position in the optical axis direction. When the first feeding cylinder 10 rotates at a predetermined position, the guide projection 10b exits from the first horizontal portion 9a-1 of the guide groove 9a and enters the lead portion 9a-2, and the lead surface 10b- of the guide projection 10b. 2 receives the guidance of the lead portion 9a-2, the first feeding cylinder 10 moves forward in the optical axis direction while rotating with respect to the fixed cylinder 9 (performs forward rotation in the optical axis direction). The first rectilinear guide ring 11 changes the position in the optical axis direction together with the first feeding cylinder 10 without rotating. When the first feeding cylinder 10 is rotated by a predetermined amount, the guide projection 10b exits from the lead portion 9a-2 of the guide groove 9a and enters the second horizontal portion 9a-3, and the circumferential surface 10b-1 of the guide projection 10b. Is guided by the second horizontal portion 9a-3, so that the first feeding cylinder 10 rotates at a fixed position. When the zoom lens barrel 1 is extended to the wide end, the guide protrusion 10b is positioned at the second horizontal portion 9a-3 of the guide groove 9a (W position in FIG. 10).

  As shown in FIG. 13A, when the zoom lens barrel 1 is in the retracted state, the rotation transmitting protrusion 12b of the second feeding cylinder 12 is the horizontal portion 10d-2 of the linkage groove 10d of the first feeding cylinder 10. Is located. When the first feeding cylinder 10 rotates in the lens barrel feeding direction from the housed state (the rotation of the first feeding cylinder 10 in the lens barrel feeding direction is conceptually indicated by the arrow F1 in FIGS. 13B to 13D). ), While the rotation transmission projection 12b is positioned in the horizontal portion 10d-2 of the linkage groove 10d, the first feeding cylinder 10 is not transmitted from the first feeding cylinder 10 to the second feeding cylinder 12 without being transmitted. Rotate alone. When the first feeding cylinder 10 rotates by a predetermined amount alone, the rotation transmission projection 12b reaches the boundary between the horizontal portion 10d-2 and the rotation transmission portion 10d-3 as shown in FIG. 13B, and the rotation transmission portion 10d-3. , The rotational force in the direction of arrow F1 is transmitted to the rotation transmission protrusion 12b. That is, the second feeding cylinder 12 rotates together with the first feeding cylinder 10.

  As shown in FIGS. 11 and 13A, when the zoom lens barrel 1 is in the retracted state, the guide protrusion 12a of the second feeding cylinder 12 is the first of the guide grooves 11d of the first rectilinear guide ring 11. It is located in the lead part 11d-1 (R position in FIG. 11). As described above, in the retracted state, the rotation transmitting projection 12b is positioned at the horizontal portion 10d-2 of the linking groove 10d, so that the second feeding cylinder 12 is not subject to the position restriction in the rotational direction by the first feeding cylinder 10, but the guide Since the protrusion 12a is positioned in the first lead portion 11d-1 of the guide groove 11d, the first linear guide ring 11 restricts the positional deviation in the rotational direction of the second feeding cylinder 12.

  When the second feeding cylinder 12 rotates together with the first feeding cylinder 10 after the above-described single rotation of the first feeding cylinder 10 in the feeding operation from the storage state, the lead surface 12a-2 of the guide protrusion 12a is guided by the guide surface 12a-2. By receiving the guidance of the first lead portion 11d-1 of the groove 11d, the second feeding cylinder 12 rotates with respect to the first feeding cylinder 10 and the first rectilinear guide ring 11 (that is, the first feeding step section). It moves forward in the optical axis direction (feeding out forward in the optical axis direction). Subsequently, the guide protrusion 12a enters the second lead portion 11d-2 from the first lead portion 11d-1, and the lead surface 12a-3 receives the guidance of the second lead portion 11d-2, whereby the second feeding cylinder 12 is moved. Continue to rotate. As a result of the second feeding cylinder 12 performing the feeding rotation with respect to the first feeding cylinder 10 and the first rectilinear guide ring 11 (first feeding step portion), as shown in FIG. Moves forward in the optical axis direction in the rotation transmitting portion 10d-3 of the linkage groove 10d of the first feeding cylinder 10 and moves away from the horizontal portion 10d-2. That is, the state where the second feeding cylinder 12 rotates together with the first feeding cylinder 10 is maintained. When the zoom lens barrel 1 is extended to the wide end, the guide protrusion 12a is positioned at the first horizontal portion 11d-3 of the guide groove 11d (W position in FIG. 11, FIG. 13C). The second rectilinear guide ring 13 changes its position in the optical axis direction together with the second feeding cylinder 12 without rotating.

  As shown in FIG. 14A, when the zoom lens barrel 1 is in the retracted state, the rotation transmission projection 17b of the cam barrel 17 is positioned in the horizontal portion 12d-2 of the linkage groove 12d of the second feeding barrel 12. doing. When the second feeding cylinder 12 rotates in the lens barrel feeding direction after the single rotation of the first feeding cylinder 10 described above from the stored state (the rotation of the second feeding cylinder 12 in the lens barrel feeding direction is shown in FIG. 14B). 14 (D) conceptually indicated by the arrow F2), while the rotation transmission projection 17b is positioned in the horizontal portion 12d-2 of the linkage groove 12d, the rotational force from the second feeding cylinder 12 to the cam cylinder 17 is reduced. The second feeding cylinder 12 rotates together with the first feeding cylinder 10 without transmission. When the second feeding cylinder 12 rotates by a predetermined amount, as shown in FIG. 14B, the rotation transmission projection 17b reaches the boundary between the horizontal portion 12d-2 and the rotation transmission portion 12d-3, and rotates from the rotation transmission portion 12d-3. The rotational force in the direction of the arrow F2 is transmitted to the transmission protrusion 17b. That is, the cam cylinder 17 rotates together with the first feeding cylinder 10 and the second feeding cylinder 12.

  As shown in FIGS. 12 and 14A, when the zoom lens barrel 1 is in the retracted state, the guide protrusion 17a of the cam barrel 17 is formed in the lead portion 13d− of the guide groove 13d of the second rectilinear guide ring 13. 1 (R position in FIG. 12). As described above, since the rotation transmission projection 17b is positioned at the horizontal portion 12d-2 of the linkage groove 12d in the housed state, the cam cylinder 17 is subjected to position restrictions in the rotational direction by the first feeding cylinder 10 and the second feeding cylinder 12. Although the guide protrusion 17a is positioned in the guide groove 13d, the displacement of the cam cylinder 17 in the rotational direction is restricted by the second rectilinear guide ring 13.

  In the feeding operation from the storage state, the cam cylinder 17 is moved to the first feeding cylinder following the single rotation of the first feeding cylinder 10 and the subsequent interlocking rotation of the first feeding cylinder 10 and the second feeding cylinder 12 described above. 10 and the second feeding cylinder 12, the lead surface 17a-2 of the guide projection 17a receives the guidance of the lead portion 13d-1 of the guide groove 13d, so that the cam cylinder 17 is moved to the second feeding cylinder 12 and It moves forward in the optical axis direction while rotating with respect to the second straight guide ring 13 (that is, the second feeding step portion) (performs forward rotation in the optical axis direction). Then, as shown in FIG. 14C, the rotation transmitting projection 17b moves forward in the rotation transmitting portion 12d-3 of the linkage groove 12d of the second feeding cylinder 12 and moves away from the horizontal portion 12d-2. . That is, the state where the cam cylinder 17 rotates together with the first feeding cylinder 10 and the second feeding cylinder 12 is maintained. When the cam cylinder 17 is rotated by a predetermined amount, the guide projection 17a exits from the lead portion 13d-1 of the guide groove 13d and enters the horizontal portion 13d-2, and the circumferential surface 17a-1 of the guide projection 17a is the horizontal portion 13d. By receiving the guide of -2, the cam cylinder 17 rotates at a fixed position. When the zoom lens barrel 1 is extended to the wide end, the guide protrusion 17a is positioned at the horizontal portion 13d-2 of the guide groove 13d (W position in FIG. 12, FIG. 14C). The third feeding cylinder 14 and the third rectilinear guide ring 15 are not rotated but change the position in the optical axis direction together with the cam cylinder 17.

  When the cam cylinder 17 rotates in the feeding direction, the fourth feeding cylinder 16 in which the cam follower CF1 is inserted into the first group cam groove CG1 of the cam cylinder 17, and the cam follower CF2 is inserted into the second group cam groove CG2 of the cam cylinder 17. The second group support ring 18 moves relative to the cam cylinder 17 in the optical axis direction along the trajectories of the cam grooves CG1 and CG2.

  Summarizing the feeding operation from the retracted state (FIGS. 1 and 7) to the wide end (FIG. 8) in the zoom lens barrel 1, the first feeding cylinder 10 rotates forward relative to the fixed cylinder 9 in the optical axis direction. The first rectilinear guide ring 11 moves straight along with the first feeding cylinder 10 forward in the optical axis direction. The second feeding cylinder 12 receives a rotational force with a predetermined time difference (delay) from the start of rotation of the first feeding cylinder 10, and when the rotation starts, the first feeding cylinder 10 and the first rectilinear guide ring 11 (first feeding cylinder 11). It moves forward in the optical axis direction with respect to the step portion. The second rectilinear guide ring 13 moves straight along with the second feeding cylinder 12 forward in the optical axis direction. The cam cylinder 17 receives a rotational force with a predetermined time difference (delay) from the start of rotation of the second feeding cylinder 12, and when the cam cylinder 17 starts rotating, the second feeding cylinder 12 and the second rectilinear guide ring 13 (second feeding step section). ) To the front in the optical axis direction. The third feed cylinder 14 and the third rectilinear guide ring 15 move straight together with the cam cylinder 17 forward in the optical axis direction. When the cam cylinder 17 rotates, the fourth supply cylinder 16 moves relative to the cam cylinder 17 in the optical axis direction while receiving the linear advance guidance by the third supply cylinder 14, and the second group support ring 18 is moved to the third straight advance guide ring 15. It moves relative to the cam cylinder 17 in the optical axis direction while receiving the straight-ahead guide. The fourth extending cylinder 16 is in a state where the wide end is extended forward in the optical axis direction with respect to the cam cylinder 17 than in the housed state.

  The second group support ring 18 is positioned rearward in the optical axis direction with respect to the cam cylinder 17 at the wide end shown in FIG. 8 than in the housed state shown in FIGS. However, the forward feeding amount of the first feeding cylinder 10, the second feeding cylinder 12, and the cam cylinder 17 with respect to the fixed cylinder 9 from the storage state to the wide end is such that the second group support ring 18 with respect to the cam cylinder 17 Since the rearward movement amount is exceeded, the position of the second group support ring 18 with respect to the fixed cylinder 9 changes forward in the optical axis direction when the housed state becomes the wide end. By the forward movement of the second group support ring 18, the retracting lever 27 supported in the second group support ring 18 is separated from the cam projection 38, and the retracting lever 27 is inserted from the retracted holding position by the biasing force of the biasing spring 39. Rotate to an allowed position. The second lens group frame 5 released from the pressing by the retraction lever 27 is rotated from the retraction position to the insertion position by the urging force of the urging spring 37, and the second lens group LG2 is moved to the first lens group LG1 and the third lens group. It is inserted on the optical axis O between LG3 (behind the shutter S).

  In the photographing state, zooming operation can be performed in the zoom range (zoom shooting range) from the wide end shown in FIG. 8 to the tele end shown in FIG. 9 by driving the zoom motor 26a. In the zoom range, the first feeding cylinder 10, the second feeding cylinder 12, and the cam cylinder 17 are always rotated without relative rotation. As shown in FIG. 10, since the guide protrusion 10b is located at the second horizontal portion 9a-3 of the guide groove 9a in the entire zoom range from the wide end (W) to the tele end (T), the first feeding cylinder 10 is A fixed position rotation is performed without moving relative to the fixed cylinder 9 in the optical axis direction. As shown in FIG. 12, since the guide projection 17a is positioned at the horizontal portion 13d-2 of the guide groove 13d in the entire zoom range from the wide end (W) to the tele end (T), the cam cylinder 17 is the second extension cylinder. 12 and the second rectilinear guide ring 13 are rotated in place without moving relative to each other in the optical axis direction. As shown in FIG. 11, for the second feeding cylinder 12, the guide protrusion 12a is positioned at the first horizontal portion 11d-3 of the guide groove 11d at the wide end (W), and the guide protrusion 12a is at the tele end (T). It is located at the second horizontal portion 11d-5 of the guide groove 11d. In the zoom range between the wide end and the tele end, the lead surface 12a-3 of the guide projection 12a moves under the guidance of a pair of opposing surfaces constituting the third lead portion 11d-4 of the guide groove 11d, and the second The feeding cylinder 12 also moves in the optical axis direction while rotating. Specifically, the second feeding cylinder 12 rotates while being fed forward in the optical axis direction from the wide end to the tele end. Due to the change in position of the second supply cylinder 12 in the optical axis direction and the change in position of the fourth supply cylinder 16 and the second group support ring 18 in the optical axis direction according to the trajectory of the cam grooves CG1 and CG2 of the cam cylinder 17. The optical axis direction positions of the first lens group LG1 and the second lens group LG2 in the zoom range change. As can be seen from the comparison between FIG. 8 and FIG. 9, the distance between the first lens group LG1 and the second lens group LG2 is large at the wide end, and the first lens group LG1 and the second lens group LG2 are both at the tele end. As well as moving forward in the optical axis direction, the distance between the first lens group LG1 and the second lens group LG2 in the optical axis direction becomes small.

  In the photographing state, focusing can be performed by driving the focus motor 25a to move the third lens group LG3 in the optical axis direction. Further, in the shooting state, when the image blur correction mode is selected, the gyro sensor 53 (FIG. 22) detects the angular velocity of the shake applied to the zoom lens barrel 1, and suppresses the image blur based on the angular velocity information. Therefore, the driving amount of the second lens group LG2 is calculated by the control unit 60 (FIG. 22), and a current is passed through the coil 35. Then, the image stabilizing frame 31 is driven along a plane orthogonal to the optical axis O, and image blur is suppressed.

  When the zoom lens barrel 1 is moved from the photographing state to the retracted state, the zoom motor 26a is driven in the retracted direction (rotation drive in the opposite direction to that during the unwinding operation) to perform the extending operation from the retracted state described above. The reverse operation is performed. The first feeding cylinder 10 moves rearward in the optical axis direction while rotating with respect to the fixed cylinder 9 when the guide protrusion 10b receives the guidance of the lead portion 9a-2 of the guide groove 9a (see FIG. 10). The first rectilinear guide ring 11 moves rectilinearly together with the first feeding cylinder 10 toward the rear in the optical axis direction. The second feeding cylinder 12 rotates together with the first feeding cylinder 10 when the guide protrusion 12a receives the guidance of the first lead portion 11d-1 and the second lead portion 11d-2 of the guide groove 11d (see FIG. 11). However, it moves rearward in the optical axis direction with respect to the first feeding cylinder 10 and the first straight guide ring 11 (first feeding step portion). The cam cylinder 17 receives the guidance of the lead portion 13d-1 of the guide groove 13d by the guide protrusion 17a (see FIG. 12), and rotates along with the second extension cylinder 12 and the second extension cylinder 12 and the second rectilinear guide ring. 13 (second feeding step portion) moves rearward in the optical axis direction. The direction of rotation of the cam ring 17 when the zoom lens barrel 1 is stored is indicated by arrows in FIG.

  When the cam cylinder 17 moves a predetermined amount rearward in the optical axis direction, as shown in FIG. 14B, the rotation transmitting projection 17b reaches the boundary between the rotation transmitting portion 12d-3 and the horizontal portion 12d-2 of the linkage groove 12d. . From this state, when the second feeding cylinder 12 rotates in the storing direction (the direction opposite to the arrow F2 in FIG. 14B), the rotation transmitting projection 17b comes out of the rotation transmitting portion 12d-3 and enters the horizontal portion 12d-2. The rotation transmission from the second feeding cylinder 12 to the cam cylinder 17 is not performed. When the second feeding cylinder 12 moves a predetermined amount rearward in the optical axis direction, as shown in FIG. 13B, the rotation transmission projection 12b is formed between the rotation transmission portion 10d-3 and the horizontal portion 10d-2 of the linkage groove 10d. Reach the border. From this state, when the first feeding cylinder 10 rotates in the storage direction (the direction opposite to the arrow F1 in FIG. 13B), the rotation transmission projection 12b comes out of the rotation transmission portion 10d-3 and enters the horizontal portion 10d-2. The rotation transmission from the first feeding cylinder 10 to the second feeding cylinder 12 is not performed. As the order of the storing operation, first, rotation transmission from the second feeding cylinder 12 to the cam cylinder 17 is not performed (the rotation of the cam cylinder 17 is stopped), and from this state, the second feeding cylinder 12 is moved in the storing direction by a predetermined amount. When the rotation is performed, the rotation transmission from the first feeding cylinder 10 to the second feeding cylinder 12 is not performed (the rotation of the second feeding cylinder 12 stops).

  While the cam cylinder 17 is rotating in the retracting direction, the fourth feeding cylinder 16 and the second group support ring 18 move relative to the cam cylinder 17 along the trajectories of the first group cam groove CG1 and the second group cam groove CG2, respectively. To move relative to the optical axis. In the storing operation from the wide end, the fourth feeding cylinder 16 moves rearward in the optical axis direction with respect to the cam cylinder 17 to increase the amount of overlap with the cam cylinder 17, and the second group support ring 18 is connected to the cam cylinder 17. In contrast, the amount of overlap with the cam cylinder 17 is increased by moving forward in the optical axis direction. However, since the amount of movement of the cam cylinder 17 in the rearward direction of the optical axis is larger than the amount of movement of the second group support ring 18 relative to the cam cylinder 17, the second group support ring 18 gradually moves to the rear back plate 23. To approach.

  When the cam cylinder 17 moves rearward in the optical axis direction and the second group support ring 18 supported by the cam cylinder 17 approaches the back plate 23, the pressed portion of the retraction lever 27 supported in the second group support ring 18 27b comes into contact with the cam surface 38a of the cam projection 38, and a component force is applied to press the retracting lever 27 in a direction against the urging force of the urging spring 39 via the cam surface 38a. Then, the retracting lever 27 rotates from the insertion allowable position toward the retracting holding position, and the pressing portion 27c of the retracting lever 27 presses the pressed protrusion 5e of the second lens group frame 5, and the biasing spring 37 is attached. The second lens group frame 5 is rotated from the insertion position to the retracted position against the force.

  At the timing before the second lens group frame 5 reaches the retracted position, the rotation of the cam cylinder 17 is stopped. At this time, the housing concave portion 17e is in a positional relationship where it overlaps with the penetrating portion 18c of the second group support ring 18 in the radial direction. Passes through and enters the storage recess 17e (FIGS. 15 and 16).

  As a result of the storage operation described above, the amount of overlap in the optical axis direction of each cylindrical (annular) member that constitutes each feeding step portion of the zoom lens barrel 1 increases, and zooming is performed in the storage state shown in FIGS. 1 and 7. The thickness of the lens barrel 1 in the optical axis direction is minimized.

  When the zoom lens barrel 1 is extended from the retracted state, the second lens group LG2 advances forward in the optical axis direction relative to the third lens group LG3 in order to prevent interference between the second lens group frame 5 and other members. The second lens group frame 5 is held at the retracted position until the second lens group LG2 is moved further forward than the third lens group LG3, and then the second lens group frame 5 is moved from the retracted position to the insertion position. Rotate. As described above, since the second group support ring 18 first moves rearward in the optical axis direction with respect to the cam barrel 17 when the cam barrel 17 rotates in the feeding direction, the zoom lens barrel 1 is first moved out. When the cam cylinder 17 is rotated in the extending direction from the first lens group, the timing at which the second lens group LG2 reaches the front position in the optical axis direction exceeding the third lens group LG3 is delayed by the backward movement of the second group support ring 18. In other words, it is necessary to move the cam barrel 17 forward in the optical axis direction, and the zoom lens barrel 1 can be prevented from being compact and quickly started. Further, when the second lens group frame 5 is retracted, the lens support tube 5c enters the housing recess 17e of the cam tube 17, so that when the zoom lens barrel 1 performs the housing operation from the photographing state, the second lens group. When the cam cylinder 17 continues to rotate in the storage direction after the retraction operation of the frame 5, it is necessary to pay attention to the possibility that the lens support cylinder 5c and the cam cylinder 17 may interfere with each other.

  Therefore, in order to realize an appropriate operation without such problems, as described above, the first feeding cylinder 10 rotates in the initial stage of the feeding operation of the zoom lens barrel 1 and the stage after the middle of the storing operation. Also, a non-rotating transmission state (rotation stopped state of the cam cylinder 17) in which the cam cylinder 17 does not rotate is set. The cam cylinder 17 is a rotating cylinder that constitutes a third feeding step portion with respect to the fixed barrel 9 among the four feeding step portions constituting the zoom lens barrel 1, and is a rotating cylinder of the first feeding step portion. The rotation is transmitted through the first feeding cylinder 10 and the second feeding cylinder 12 which is the rotating cylinder of the second feeding stage. In the zoom lens barrel 1 of the present embodiment, the first rotation transmission control involved in the rotation transmission from the first feeding cylinder 10 to the second feeding cylinder 12 is a configuration for realizing the rotation stop state of the cam cylinder 17. And the second rotation transmission control unit involved in the rotation transmission from the second feeding cylinder 12 to the cam cylinder 17 include an idling section that does not transmit the rotation from the preceding rotation cylinder to the subsequent rotation cylinder. ing. The idling section is set by the horizontal portion 10d-2 of the linkage groove 10d in the first rotation transmission control unit, and is set by the horizontal portion 12d-2 of the linkage groove 12d in the second rotation transmission control unit.

  As a configuration different from the zoom lens barrel 1 of the present embodiment, an idling section is set only between the first feeding cylinder 10 and the second feeding cylinder 20, and the second feeding cylinder 20 and the cam cylinder 17 are always integrated. The first comparative example that is rotated in the first and second idle cylinders 20 is set only between the second cylinder 20 and the cam cylinder 17 so that the first cylinder 10 and the second cylinder 20 are always rotated integrally. Assume a second comparative example.

  In the first comparative example, in order to prevent interference between the second lens group frame 5 and other members when the lens barrel is extended, an operation of moving the second lens group LG2 forward in the optical axis direction from the third lens group LG3, It needs to be completed before the second feeding cylinder 20 starts to rotate. When the second lens group LG2 (second group support ring 18) moves forward in the optical axis direction when the second feeding cylinder 20 does not rotate, the first feeding step portion (with the first feeding cylinder 10 and the first feeding cylinder 10) moves forward. Since only the feeding operation of the first straight guide ring 11) is performed, the movement amount in the optical axis direction per unit rotation angle of the first feeding cylinder 10 must be increased. That is, the lead angle (the portion corresponding to the lead portion 9a-2 of the guide groove 9a in the illustrated embodiment) for feeding out the first feeding tube 10 with respect to the rotation direction of the first extending tube 10 in the illustrated embodiment. It is necessary to increase the inclination angle of the lead portion 9a-2. If the lead angle of the feeding guide portion is increased, the load applied when the first feeding cylinder 10 is rotated and fed increases, and the transmission efficiency of power using the zoom motor 26a as a drive source is deteriorated. In addition, when the second feeding cylinder 20 in the rotation stopped state is started after the second lens group LG2 is advanced forward from the third lens group LG3, the second feeding step portion is configured. Since not only the two-feed cylinder 20 but also the cam cylinder 17 that constitutes the third feed stage portion are simultaneously started to rotate, the load fluctuation becomes large and it is difficult to obtain high operation accuracy.

  In the second comparative example, the movement of the second lens group LG2 forward in the optical axis direction in a state where the cam cylinder 17 does not rotate is referred to as a first feeding step portion (the first feeding cylinder 10 and the first feeding cylinder 10). Since it can be distributed and carried out in the feeding operation of the rectilinear guide ring 11) and the feeding operation of the second feeding step portion (the second feeding cylinder 12 and the second rectilinear guide ring 13) with respect to the first feeding step portion. The lead angle of the feeding guide portion in each feeding step portion is suppressed to be smaller than that of the first comparative example. On the other hand, since the rotation angle of the second feeding cylinder 12 required until the rotation of the cam cylinder 17 becomes very large, a guide portion (in the first rectilinear guide ring 11 of the illustrated embodiment) that guides the rotation of the second feeding cylinder 12 is provided. It is necessary to form a long portion corresponding to the guide groove 11d, and it becomes difficult to ensure the strength of the first straight guide ring 11. Moreover, when the length of the guide part which occupies on the surrounding surface of the 1st rectilinear guide ring 11 increases, the surrounding area of the 1st rectilinear guide ring 11 may become large, and there exists a possibility that the whole lens-barrel may enlarge.

  On the other hand, in the zoom lens barrel 1 of the present embodiment, the idling sections are allocated and set between the respective feeding steps from the first feeding cylinder 10 through the second feeding cylinder 12 to the cam cylinder 17. Thus, there is no problem as in the first and second comparative examples. In other words, the cam cylinder 17 can be appropriately restricted at the time of unwinding and storage while being excellent in power transmission efficiency and small in load fluctuation, and ensuring the strength and miniaturization of parts.

  In the non-rotation transmission state from the first feeding cylinder 10 to the second feeding cylinder 12 and the non-rotation transmission state from the second feeding cylinder 12 to the cam cylinder 17, not only the rotation transmission is interrupted, but also the second It is necessary to stabilize the rotational position of the feeding cylinder 12 and the cam cylinder 17. Particularly, in the linkage groove 10d and the linkage groove 12d of the present embodiment, the introduction portion 10d-1 and the introduction portion 12d-1 are formed after the horizontal portion 10d-2 and the horizontal portion 12d-2, respectively, so that the rotation non-transmission state The rotational direction positions of the second feeding cylinder 12 and the cam cylinder 17 are unintentionally shifted, and the rotation transmission projection 12b and the rotation transmission projection 17b move to the introduction portion 10d-1 and the introduction portion 12d-1 to move to the linkage groove. The possibility of falling off from 10d and the linkage groove 12d must be considered. As long as the urging force in the optical axis direction acts on the second feeding cylinder 12 and the cam cylinder 17, the rotation transmitting projection 12b and the wall surface of the horizontal portion 10d-2 and the horizontal portion 12d-2 Since the force which presses the rotation transmission protrusion 17b acts, the rotation direction position of the 2nd delivery cylinder 12 or the cam cylinder 17 can be stabilized. For example, in a lens barrel having a lens barrier at its tip, there is known a lens barrel that imparts such an urging force in the optical axis direction by a spring that constitutes a lens barrier opening / closing operation mechanism. However, the zoom lens barrel 1 of the present embodiment is of a type that does not include a lens barrier (in which a protective glass 4 is provided instead), and the second feeding cylinder 12 and the cam cylinder 17 are positively moved in the optical axis direction. The structure is not energized. However, as can be seen from FIGS. 13A and 13B, in the rotation non-transmission state in which the rotation transmission projection 12b is positioned at the horizontal portion 10d-2, the guide projection 12a positioned at the base of the rotation transmission projection 12b is provided. By fitting in the first lead portion 11d-1 of the guide groove 11d, the positional deviation in the rotational direction of the second feeding cylinder 12 is prevented via the first linear guide ring 11. Further, as can be seen from FIGS. 14A and 14B, in the rotation non-transmission state in which the rotation transmission projection 17b is located at the horizontal portion 12d-2, the guide projection 17a located at the base of the rotation transmission projection 17b is provided. By fitting in the lead portion 13d-1 of the guide groove 13d, the cam cylinder 17 is prevented from being displaced in the rotational direction via the second rectilinear guide ring 13. Since the holding portion for preventing the positional deviation in the rotation direction uses the lead surface of the feeding mechanism that causes the second feeding cylinder 12 and the cam cylinder 17 to rotate and feed, the addition of members and the mechanism are complicated. It can be obtained with a simple configuration without accompanying.

  The arrangement of the shutter flexible substrate 8 in the zoom lens barrel 1 will be described. As shown in FIGS. 1 and 7 to 9, the shutter flexible substrate 8 extends from the connecting portion to the shutter block 7 along the inner peripheral surface of the second group support ring 18 toward the rear in the optical axis direction. When reaching the rear end of the second group support ring 18, it goes in the outer diameter direction and passes through the flexible board introduction hole 13 e in front of the flexible board support part 13 f of the second linear guide ring 13. The shutter flexible substrate 8 that has passed through the flexible substrate introduction hole 13e is supported by the flexible substrate support portion 13f, and again passes through the flexible substrate introduction hole 13e behind the flexible substrate support portion 13f to enter the second rectilinear guide ring 13. Led. Subsequently, the shutter flexible substrate 8 extends rearward in the optical axis direction along the inner peripheral surface of the second rectilinear guide ring 13, and when it reaches the rear end portion of the second rectilinear guide ring 13, the shutter flexible substrate 8 moves toward the outer diameter direction. 9 through the flexible substrate introduction hole 9c and out of the fixed cylinder 9, and is supported by the flexible substrate support 9d. The shutter flexible substrate 8 has a surface on the outer diameter side of the flexible substrate support portion 13f (a surface on the side facing the inner peripheral surface of the second feeding cylinder 12) and a surface on the outer diameter side of the flexible substrate support portion 9d. Then, it is fixed using means such as double-sided tape or adhesion. That is, the support (fixed) portion of the shutter flexible substrate 8 in the zoom lens barrel 1 is set to the fixed tube 9, the second rectilinear guide ring 13, and the shutter block 7 in order from the outer diameter side. As described above, in the zoom lens barrel 1, the second rectilinear guide ring 13 constitutes the second extending step portion, and the second group supporting ring 18 that supports the shutter block 7 is light with respect to the third extending step portion. An inward moving portion that moves in the axial direction (a moving portion in the fourth stage with respect to the fixed cylinder 9) is configured. The shutter flexible substrate 8 is arranged so as to straddle the position in the rear in the optical axis direction without being supported by the first feeding step portion and the third feeding step portion.

  Of the flexible substrate 8 for shutter, the first connection portion 8a is connected to the shutter block 7, the first support portion 8b is supported by the flexible substrate support portion 13f, and the portion supported by the flexible substrate support portion 9d. A portion between the first connecting portion 8a and the first support portion 8b is a first intermediate portion 8d, and a portion between the first support portion 8b and the second support portion 8c is a second intermediate portion 8e. And As shown in FIG. 6, a second connection portion 8f is provided at the end of the shutter flexible substrate 8 opposite to the first connection portion 8a, and the second connection portion 8f is connected to the control unit 60 (FIG. 22). To do. In the range from the first connection portion 8a to the second support portion 8c, the shutter flexible substrate 8 extends in the longitudinal direction in the optical axis direction and is folded back by the first support portion 8b and the second support portion 8c. The second support portion 8c to the second connection portion 8f are bent and extended in a direction substantially perpendicular to the optical axis (see FIG. 6).

  In accordance with the change in the extended state of the zoom lens barrel 1, the shutter flexible substrate 8 has the first intermediate portion 8a, the first support portion 8b, the second support portion 8c in the positional relationship in the optical axis direction, and the first intermediate portion. The shapes of the part 8d and the second intermediate part 8e are changed. FIG. 23 shows a shutter for easy understanding of the shape change of the shutter flexible substrate 8 at the retracted state of the zoom lens barrel 1 (FIGS. 1 and 7), the wide end (FIG. 8), and the tele end (FIG. 9). Only the block 7 and the shutter flexible substrate 8 are shown.

  In the storage state shown in FIGS. 1, 7, and 23A, the shutter flexible substrate 8 has the first connecting portion 8a, the first supporting portion 8b, and the second supporting portion 8c at substantially the same position in the optical axis direction. The first intermediate portion 8d and the second intermediate portion 8e each have a U-shape that protrudes rearward in the optical axis direction. A folded portion inserted into the flexible substrate introduction hole 13e is formed in front of the first support portion 8b, and a folded portion inserted into the flexible substrate introduction hole 9c is formed in front of the second support portion 8c. . The first intermediate portion 8d includes a region extending rearward in the optical axis direction along the second group support ring 18 from the first connection portion 8a, and a light beam along the second rectilinear guide ring 13 from the folded portion in the flexible substrate introduction hole 13e. A region extending rearward in the axial direction is at substantially the same position in the optical axis direction, and a region connecting these two extended regions in the optical axis direction is a third feeding step portion (third feeding cylinder 14, cam cylinder 17, The third straight travel guide ring 15) is placed in the space between the third straight travel guide ring 15 and the back plate 23 so as to straddle the rear of the third straight travel guide ring 15). The second intermediate portion 8e extends from the folded portion in the flexible substrate introduction hole 13e to the rear in the optical axis direction along the second linear guide ring 13, and extends from the folded portion in the flexible substrate introduction hole 9c to the fixed cylinder 9. The region extending rearward in the optical axis direction is substantially at the same position in the optical axis direction, and the region connecting these two extended regions in the optical axis direction is the first feeding step (first feeding cylinder 10, first straight traveling). It fits in the space between the first straight guide ring 11 and the back plate 23 so as to straddle the back of the guide ring 11).

  At the wide end shown in FIG. 8 and FIG. 23 (B), the first extending step portion and the second extending step portion are respectively extended forward in the optical axis direction with respect to the fixed cylinder 9, and as a result, the shutter flexible substrate 8. 1st support part 8b supported by the 2nd rectilinear guide ring 13 which comprises a 2nd delivery step part among these moves to the optical axis direction front with respect to the 2nd support part 8c supported by the fixed cylinder 9. To do. Along with the movement of the first support portion 8b, the second intermediate portion 8e changes the position of the rear end portion forward in the optical axis direction. When moving from the stowed state to the wide end, the third feeding step portion with respect to the second feeding step portion is also fed forward in the optical axis direction. As described above, the cam constituting the third feeding step portion The second group support ring 18 moves relative to the cylinder 17 rearward in the optical axis direction. Therefore, in the shutter flexible substrate 8, the first connection portion 8a and the first support portion 8b have almost no change in the front-rear relationship in the optical axis direction. Strictly speaking, as can be seen from the comparison between FIG. 23A and FIG. 23B, the relative position of the first connecting portion 8a with respect to the first support portion 8b is slightly light at the wide end. It changes backward in the axial direction. At the wide end, the first intermediate portion 8d and the second intermediate portion 8e are each provided with a margin in length, and the length margin is curved in a convex shape toward the rear in the optical axis direction. ing.

  At the tele end shown in FIG. 9 and FIG. 23 (C), the first extending step portion does not change the position in the optical axis direction from the wide end state, and the second extending step portion is extended forward in the optical axis direction. ing. As a result, in the shutter flexible substrate 8, the first support portion 8 b supported by the second rectilinear guide ring 13 constituting the second feeding step portion is changed to the second support portion 8 c supported by the fixed cylinder 9. On the other hand, it moves further forward in the optical axis direction than the wide end. Along with the movement of the first support portion 8b, the second intermediate portion 8e changes the position of the rear end portion forward in the optical axis direction, and the protruding amount of the curved portion in the second intermediate portion 8e toward the rear in the optical axis direction is increased. Get smaller. Further, when the wide end is changed to the tele end, the third feeding step portion does not change the position in the optical axis direction with respect to the second feeding step portion, but the cam cylinder 17 constituting the third feeding step portion is rotated. Accordingly, the second group support ring 18 is extended forward in the optical axis direction. As a result, in the shutter flexible substrate 8, the first connection portion 8a connected to the shutter block 7 in the second group support ring 18 moves forward in the optical axis direction with respect to the first support portion 8b. As the first connecting portion 8a moves, the first intermediate portion 8d changes the position of the rear end portion forward in the optical axis direction, and the amount of protrusion of the curved portion in the first intermediate portion 8d toward the rear in the optical axis direction is increased. Get smaller.

  As can be seen from FIG. 9 and FIG. 23C, in the zoom lens barrel 1, the shutter block 7 is extended most forward in the optical axis direction at the telephoto end, and the maximum extended state of the shutter block 7 can be handled. The length is given to the shutter flexible substrate 8. The shutter flexible substrate 8 at the tele end is set to a length with a minimum margin that does not impose a load on the operation of the zoom lens barrel 1 and is arranged in the zoom lens barrel 1 with almost no slack. ing. As shown in FIGS. 8 and 23B, the curved portions at the rear ends of the first intermediate portion 8d and the second intermediate portion 8e are zoomed even at the wide end where the length of the flexible substrate 8 for shutter becomes large. The lens barrel 1 does not sag so much that it hangs down in the inner diameter direction. As shown in FIGS. 1, 7 and 23A, the first intermediate portion 8d and the second intermediate portion 8e in the retracted state of the zoom lens barrel 1 are composed of the fixed tube 9, the second straight guide ring. The zoom lens has a shape including a region extending in the optical axis direction along the first and second group support rings 18 and a region extending in the radial direction of the zoom lens barrel 1 along the front surface of the rear plate 23. The lens barrel 1 is accommodated between the constituent members.

  More specifically, in the shutter flexible substrate 8, when the first connection portion 8a and the first support portion 8b move in the optical axis direction, the curvature of the rear end in the optical axis direction of the first intermediate portion 8d and the second intermediate portion 8e. The part changes the position in the optical axis direction by a movement amount substantially half of that of the first connection part 8a and the first support part 8b. Here, with respect to the first intermediate portion 8d, the second rectilinear guide ring 13 and the second group support that are located across the third feed stepped portion (the third feed cylinder 14, the third rectilinear guide ring 15, and the cam cylinder 17). Since the support of the ring 18 (shutter block 7) is received, the first connection portion 8a that affects the movement amount of the first intermediate portion 8d is connected to the first support portion 8b that is the previous support portion. On the other hand, the movement in the optical axis direction for two stages is performed by combining the movement of the third feeding step portion and the movement of the second group support ring 18 with respect to the third feeding step portion. In addition, the second intermediate portion 8e is supported by the fixed cylinder 9 and the second rectilinear guide ring 13 that are located across the first payout stage (the first payout cylinder 10 and the first rectilinear guide ring 11). Therefore, the first support portion 8b that affects the movement amount of the second intermediate portion 8e is different from the movement of the first feeding step portion with respect to the second support portion 8e that is the previous support portion. Then, the movement in the optical axis direction for two stages is performed by combining the movement of the second feeding stage part (second feeding cylinder 12 and second linear guide ring 13) with respect to the first feeding stage part. Therefore, the telephoto end (FIGS. 9 and 23) passes through the wide end (FIGS. 8 and 23B) from the retracted state (FIGS. 1, 7, and 23A) where the zoom lens barrel 1 is not extended. In the stage up to (C)), both the first intermediate portion 8d and the second intermediate portion 8e can be formed into a shape in which the slack of the curved portion at the rear end in the optical axis direction does not remain largely. In particular, at the tele end where the first connecting portion 8a and the first support portion 8b have moved most forward in the optical axis direction, a configuration in which the lengths of the first intermediate portion 8d and the second intermediate portion 8e are hardly left is realized.

  In the imaging optical system of the zoom lens barrel 1, the distance between the second lens group LG2 and the shutter block 7 in the optical axis direction is large with respect to the first lens group LG1 at the wide end, and the second lens group LG2 and shutter are wide from the wide end to the tele end. The block 7 moves greatly forward in the optical axis direction and approaches the first lens group LG1. Since this movement amount is large, it is difficult to cover the entire movement range of the zoom range of the second group support ring 18 only by the trajectory of the second group cam groove CG2 of the cam cylinder 17 in which the length in the optical axis direction is kept short. Any one of the first to third feeding steps up to the group support ring 18 needs to carry out the feeding operation in the optical axis direction in the zoom range. When the first feeding step portion formed by the first feeding cylinder 10 and the first rectilinear guide ring 11 is moved in the optical axis direction in the zoom range, the operating range of the third lens group LG3 that is the focus lens group is limited. There is a risk that. When the third feeding step portion formed by the third feeding cylinder 14, the third rectilinear guide ring 15 and the cam cylinder 17 is moved in the optical axis direction in the zoom range, the guide of the second rectilinear guide ring 13 which guides the movement. As in the third lead portion 11d-4 of the guide groove 11d of the first rectilinear guide ring 11, the groove 13d needs to have a shape including an inclination component in the optical axis direction in the zoom range. As a result, the formation positions of the flexible substrate introduction hole 13e and the flexible substrate support portion 13f in the second linear guide ring 13 are restricted, and it becomes necessary to form them behind the position shown in FIG. It becomes difficult to support the flexible printed circuit board 8 at a desired position (front position in the optical axis direction of the second linear guide ring 13). Therefore, when the second rectilinear guide ring 13 constituting the second feeding step portion is set as an intermediate support location for the shutter flexible substrate 8, the second feeding step portion is moved in the optical axis direction in the zoom range. The configuration of the present embodiment is optimal.

  Although the present invention has been described based on the illustrated embodiment, the present invention is not limited to the illustrated embodiment. For example, although the illustrated embodiment is directed to the shutter actuator 7a of the shutter block 7 as an electrical component to which the flexible substrate is connected, an electrical component other than the shutter actuator may be the connection target of the flexible substrate.

  In the zoom lens barrel 1 of the illustrated embodiment, the second lens group LG2 is inserted into and removed from the optical axis O during transition between the housed state and the photographing state. It can also be applied to a zoom lens barrel that does not. Therefore, unlike the zoom lens barrel 1 of the illustrated embodiment, a zoom lens barrel of a type that does not set an idling section that does not transmit rotation to the rotating barrel at the time of extension or storage is also applicable.

  In addition, the zoom lens barrel 1 of the illustrated embodiment is a type in which the second lens group LG2 inserted / removed on the optical axis also performs an image blur correction operation, but the present invention does not have an image blur correction function. It can also be applied to a lens barrel.

DESCRIPTION OF SYMBOLS 1 Zoom lens barrel 5 2nd lens group frame 5a Support arm part 5b Shaft hole 5c Lens support cylinder 5d Positioning piece 5e Pressed protrusion 6 Third lens group frame 6a Lens support cylinder 6b Support arm part 6c Support arm part 7 Shutter block (Electrical component)
7a Shutter actuator (electric part)
8 shutter flexible substrate 8a first connection portion 8b first support portion 8c second support portion 8d first intermediate portion 8e second intermediate portion 8f second connection portion 9 fixed cylinder 9a guide groove (one-step guide groove)
9a-1 First horizontal part 9a-2 Lead part (inclined groove part)
9a-3 Second horizontal part (circumferential groove)
9a-4 Opening 9b Straight guide groove 9c Flexible board introduction hole 9d Flexible board support part 10 First feeding cylinder (first feeding stage part, first stage rotating cylinder)
10a peripheral gear 10b guide projection 10b-1 circumferential surface 10b-2 lead surface 10c coupling groove 10d linking groove (rotation transmitting portion)
10d-1 introduction part 10d-2 horizontal part 10d-3 rotation transmission part 11 1st rectilinear guide ring (1st feeding step part, 1st stage rectilinear guide ring)
11a rectilinear guide protrusion 11b coupling protrusion 11c rectilinear guide groove 11d guide groove (two-stage guide groove)
11d-1 1st lead part (feeding inclined groove part)
11d-2 Second lead part (tilt groove part for feeding)
11d-3 1st horizontal part (1st circumferential direction groove part)
11d-4 3rd lead part (inclination groove part for zoom range)
11d-5 2nd horizontal part (2nd circumferential groove part)
11d-6 Opening 12 Second delivery cylinder (second delivery stage, second stage rotating cylinder)
12a guide projection 12a-1 circumferential surface 12a-2 lead surface 12a-3 lead surface 12b rotation transmission projection 12c coupling groove 12d linkage groove 12d-1 introduction portion 12d-2 horizontal portion 12d-3 rotation transmission portion 13 second straight guide Ring (2nd feed stage, 2nd stage straight guide ring)
13a rectilinear guide protrusion 13b coupling protrusion 13c rectilinear guide groove 13d guide groove (guide groove for three steps)
13d-1 Lead part (inclined groove part)
13d-2 Horizontal part (circumferential groove)
13d-3 Opening 13e Flexible board introduction hole 13f Flexible board support part 14 3rd delivery cylinder (3rd delivery stage part, 3rd stage rectilinear guide ring)
14a rectilinear guide protrusion 14b coupling protrusion 14c rectilinear guide groove 15 3rd rectilinear guide ring (3rd feeding step portion, 3rd rectilinear guide ring)
15a rectilinear guide protrusion 15b coupling protrusion 15c key protrusion 15d rectilinear guide groove 16 fourth feed cylinder 16a rectilinear guide protrusion 16b lens support cylinder 17 cam cylinder (third feed step)
17a Guide protrusion 17a-1 Circumferential surface 17a-2 Lead surface 17b Rotation transmission protrusion (rotation transmission part)
17c coupling groove 17d coupling groove 17e housing recess 18 second group support ring (inward moving part)
18a Key groove 18b Straight guide protrusion 18c Through portion 20 Imaging element 21 Optical filter 22 Packing 23 Back plate 25 Focus motor unit 25a Focus motor 2
25b Nut 26 Zoom motor unit 26a Zoom motor 26b Zoom gear 26c Gear box 27 Retraction lever 27a Shaft hole 27b Pressed portion 27c Pressing portion 30 Support frame 31 Anti-vibration frame 32 Guide ball 33 Tension spring 34 Permanent magnet 35 Coil 36 Support shaft 37 Energizing spring 38 Cam projection 38a Cam surface 38b Side surface 39 Energizing spring 50 3 group guide shaft 51 3 group energizing spring 52 Flexible substrate 53 for motor Gyro sensor 60 Controller CF1 CF2 Cam follower CG1 Cam groove CG2 for 2 groups Cam for 2 groups Groove LG1 First lens group (variable magnification lens group)
LG2 Second lens group (variable magnification lens group)
LG3 Third lens group O Optical axis S Shutter

Claims (9)

Fixed cylinder;
A first feeding step portion located inside the fixed cylinder and supported so as to be movable in the optical axis direction with respect to the fixed cylinder;
A second feeding step portion located inside the first feeding step portion and supported so as to be movable in the optical axis direction with respect to the first feeding step portion;
A third feeding step portion located inside the second feeding step portion and supported so as to be movable in the optical axis direction with respect to the second feeding step portion;
An inward moving portion that supports the electrical component and is supported so as to be movable in the optical axis direction with respect to the third feeding step portion;
An imaging optical system including a flexible substrate that connects the electrical component and the control unit; and a plurality of variable power lens groups that move relative to each other in the optical axis direction to change the focal length;
Have
When operating from a stowed state where no photographing is performed to a zoom photographing range enabling photographing with the imaging optical system, the first feeding step unit, the second feeding step unit, and the third feeding step unit are optical axes, respectively. Moving to the object side of the direction;
When the focal length is changed within the zoom photographing area, the first extension step does not move in the optical axis direction with respect to the fixed cylinder, and the third extension step is light with respect to the second extension step. The second feeding step portion moves in the optical axis direction with respect to the first feeding step portion without moving in the axial direction;
The second feeding step portion has a rotatable second-stage rotating cylinder and a second-stage rectilinear guide ring that is guided in a straight line in the optical axis direction and does not rotate; and the flexible substrate moves in the second-stage straight line A first support part fixedly supported by the guide ring, a second support part fixedly supported by the fixed cylinder, a first intermediate part from the electrical component to the first support part, and the first A second intermediate portion from one support portion to the second support portion, and the first intermediate portion and the second intermediate portion are fixed to the first feeding step portion and the third feeding step portion, respectively. Not be done;
A zoom lens barrel characterized by 2. The zoom lens barrel according to claim 1, wherein the first intermediate portion of the flexible substrate is disposed across the image plane side position of the third feeding step portion in the optical axis direction, and the second intermediate portion. The zoom lens barrel is disposed across the position on the image plane side in the optical axis direction of the first feeding step portion. The zoom lens barrel according to claim 1 or 2,
The second stage linear guide ring is connected to an inclined groove portion that is inclined with respect to both the optical axis direction and a circumferential direction around the optical axis, and an object side end portion of the inclined groove portion in the optical axis direction. A three-stage guide groove including a circumferential groove extending in the circumferential direction, and guiding the movement of the third feeding step by the three-stage guide groove,
A flexible substrate support that fixedly supports the first support portion of the flexible substrate at the image side position in the optical axis direction of the three-stage guide groove of the second-stage linear guide ring with respect to the circumferential groove portion. A zoom lens barrel having a portion and a flexible substrate introduction hole through which the flexible substrate is inserted in the radial direction. The zoom lens barrel according to claim 3, wherein the third feeding step portion is
Guide protrusions that are slidably inserted into the three-stage guide grooves, a rotation transmitting portion that transmits a rotational force from the second-stage rotating cylinder, and optical axes of the plurality of variable magnification lens groups A cam cylinder having a plurality of cam grooves for guiding directional movement; and a second cylinder that is guided so as to be linearly movable in the optical axis direction through the second-stage linear guide ring and moves in the optical axis direction together with the cam cylinder. 3-stage straight guide ring;
Have
When the zoom shooting range is reached from the retracted state, the guide projection of the cam cylinder moves through the inclined groove portion of the three-stage guide groove, and in the zoom shooting range, the guide projection of the cam cylinder is the 3 A zoom lens barrel that moves in the circumferential groove of the step guide groove. In the zoom lens barrel according to any one of claims 1 to 4,
The fixed cylinder is connected to an inclined groove portion that is inclined with respect to both the optical axis direction and a circumferential direction around the optical axis, and an end of the inclined groove portion on the object side in the optical axis direction. A first-stage guide groove including a circumferential groove extending to the first-stage guide groove, and the first-stage guide groove guides the movement of the first feed-out step section.
A flexible substrate support portion that fixedly supports the second support portion of the flexible substrate at an image-side position in the optical axis direction of the guide groove for the first stage with respect to the circumferential groove portion of the fixed cylinder; and a radial direction A zoom lens barrel having a flexible substrate introduction hole through which the flexible substrate is inserted. 6. The zoom lens barrel according to claim 5, wherein the first feeding step portion is
A first-stage rotating cylinder having a guide protrusion slidably inserted into the first-stage guide groove, a rotation transmitting portion for transmitting a rotational force to the second-stage rotating cylinder; A first stage rectilinear guide ring that is guided through the cylinder so as to be linearly movable in the optical axis direction and moves in the optical axis direction together with the first stage rotating cylinder;
Have
When the zoom shooting range is reached from the stowed state, the guide protrusion of the first-stage rotating cylinder moves along the inclined groove portion of the first-stage guide groove, and the first-stage rotating cylinder of the first-stage rotating cylinder is moved in the zoom shooting area. A zoom lens barrel in which the guide protrusion moves in the circumferential groove of the first-stage guide groove. 7. The zoom lens barrel according to claim 6, wherein the first stage rectilinear guide ring includes a feeding inclined groove portion that is inclined with respect to both the optical axis direction and the circumferential direction, and an optical axis of the feeding inclined groove portion. A first circumferential groove extending in the circumferential direction by connecting to the object-side end of the direction, and more inclined than both the optical axis direction and the circumferential direction than the first circumferential groove. A zoom region inclined groove extending toward the object side in the optical axis direction, and a second circumferential groove extending in the circumferential direction by connecting to the object side end of the zoom region inclined groove on the object side. A guide groove provided on the second-stage rotating cylinder is slidably inserted into the second-stage guide groove;
When the zoom shooting range is reached from the retracted state, the guide protrusion of the second-stage rotating cylinder moves along the feeding inclined groove portion of the two-stage guide groove, and the second-stage rotation is performed in the zoom shooting range. A zoom lens barrel in which the guide protrusion of the tube moves in the first circumferential groove portion, the zoom region inclined groove portion, and the second circumferential groove portion of the two-stage guide groove. 8. The zoom lens barrel according to claim 1, wherein the electrical component is a shutter actuator that drives a shutter. 9. The zoom lens barrel according to claim 1, wherein the inward movement portion supports one of the plurality of variable magnification lens groups separately from the electrical component. .

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