JP2018021967A - Lens barrel and method for manufacturing lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel that is excellent in strength of an enclosure and dust resistance, and can perform positioning of an adjustment object element simply with high accuracy.SOLUTION: In a state of a functional unit in which a subject image is formed by an imaging lens system and position control is enabled in an optical axis direction of a movable frame via a guide shaft and a drive transmission mechanism, a projection holding unit of the movable frame is projected from a front end or rear end in an optical axis direction of an enclosure constituting the functional unit. The movable frame holds an adjustment object element, and the projection holding unit of the movable frame is provided with an adjustment insertion unit that exposes part of the adjustment object element to the outside of the enclosure in the state of the functional unit and enables positioning of the adjustment object element through the exposed part.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a lens barrel mounted on an imaging apparatus and a method for manufacturing the lens barrel.

  In a lens barrel, as a drive mechanism for driving a movable frame holding an optical element such as a lens linearly in the optical axis direction, a guide unit that guides the movable frame linearly in the optical axis direction, and a driving force from a drive source such as a motor Many are provided with a drive transmission unit that transmits the above to the movable frame. From the viewpoint of drive accuracy management, drive force transmission efficiency, space efficiency, and the like, it is desirable that the guide portion and the drive transmission portion be arranged as close as possible. On the other hand, when the guide portion and the drive transmission portion are arranged together, the movable frame is in a state close to a cantilever structure by the guide portion, and the displacement due to the load tends to occur as the distance from the guide portion increases.

  Many lens barrels include an adjustment mechanism that can adjust the position of an adjustment target element such as a lens or a lens frame in a direction orthogonal to the optical axis (shift direction) or a tilt direction (tilt direction) with respect to the optical axis (patents). Document 1, Patent Document 2, etc.). When the movable frame that is driven linearly as described above holds the adjustment target element, if the adjustment is performed on the adjustment target element while the movable frame is incorporated in the lens barrel, the movable frame is displaced by the load during adjustment. May affect accuracy. As a countermeasure, it is conceivable to insert means for holding the movable frame during adjustment into the lens barrel. However, when there is an adjustment target element at a deep position in the lens barrel, there is a problem that it is difficult for an operator to recognize the vicinity of the movable frame and workability is poor. In addition, a decrease in strength and a reduction in dust resistance due to the formation of an opening or notch for inserting the holding means in the housing of the lens barrel are also problems.

  In Patent Document 3, a guide shaft is protruded from an end wall of a unit base that incorporates a movable frame that is driven linearly. A configuration is described in which the position of a movable frame that receives guidance from a guide shaft is adjusted by moving. In this configuration, the position of the movable frame changes in both the shift direction and the tilt direction due to the adjustment with respect to the guide shaft, and the position change in each direction cannot be arbitrarily set independently. There are restrictions on accuracy. Further, since the position of the movable frame itself is moved by adjusting the guide shaft, the space efficiency may be deteriorated. For example, even when it is desired to adjust the position of the lens supported by the movable frame, a large space including the amount of movement of the movable frame located outside the lens is required.

JP 2007-271648 A JP 2001-305408 A JP 2013-076920 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lens barrel and a method for manufacturing a lens barrel that are excellent in strength and dustproofness of a casing and that can easily and accurately adjust the position of an adjustment target element.

  The present invention includes a housing that internally holds an imaging lens system that forms a subject image, and is supported so as to be movable in the optical axis direction of the imaging lens system along a guide axis that is supported in the housing and holds an adjustment target element The present invention relates to a lens barrel that includes a movable frame that moves, a drive transmission mechanism that transmits a driving force in the optical axis direction from a drive source to the movable frame, and a manufacturing method thereof.

  In the aspect of the lens barrel of the present invention, the movable frame includes a protruding holding portion that holds the adjustment target element in a state that allows position adjustment. In the state of the functional unit in which the subject image is formed by the imaging lens system and the position of the movable frame in the optical axis direction can be controlled via the guide shaft and the drive transmission mechanism, the protrusion holding portion of the movable frame is the optical axis of the housing. At least a part can protrude in the optical axis direction from the front end or the rear end of the direction. The protrusion holding portion is provided with an adjustment insertion portion that exposes a part of the adjustment target element to the outside of the housing in the state of the functional unit and enables the position adjustment of the adjustment target element through the exposed portion.

  The protrusion holding part of the movable frame is a cylindrical body surrounding the optical axis of the imaging lens system, and the adjustment insertion part preferably penetrates the protrusion holding part in the radial direction centering on the optical axis. It is preferable that the movable frame is further provided with a held portion that is a wall portion that is located on the outer peripheral surface of the protruding holding portion and faces in a direction substantially orthogonal to the optical axis.

  The protruding holding portion of the movable frame can be protruded to either the front end or the rear end in the optical axis direction with respect to the housing. As an example, when the movable frame is located on the front end side of the functional unit, the protruding holding portion is protruded from the front end of the housing, and the imaging element that receives light passing through the imaging lens system is supported on the rear end side of the housing. Can be configured.

  The housing of the lens barrel has a peripheral wall that surrounds the imaging lens system, and has a cylindrical member that supports one end of the guide shaft therein, and is attached to the end of the cylindrical member in the optical axis direction. A guide shaft holding member that supports the end can be combined. In this case, it is preferable that the protrusion holding portion of the movable frame protrudes in the optical axis direction through an opening provided in the guide shaft holding member so as to penetrate in the optical axis direction.

  In the aspect of the lens barrel manufacturing method of the present invention, there is provided a functional unit capable of forming a subject image by the imaging lens system and controlling the position of the movable frame in the optical axis direction via the guide shaft and the drive transmission mechanism. In the state of the functional unit that is formed, a protrusion holding portion that is a part of the movable frame is protruded in the optical axis direction from the front end or the rear end in the optical axis direction of the housing, and the held portion provided in the protrusion holding portion of the movable frame A holding jig is attached to the movable frame to hold the movable frame, and an adjustment jig is inserted into the adjustment insertion portion provided in the protruding holding portion of the movable frame, and the position can be adjusted in the protruding holding portion. The position adjustment of the adjustment target element is performed, and after the position adjustment, the adjustment target element is fixed to the movable frame, and the holding jig and the adjustment jig are removed from the movable frame.

  The protrusion holding part of the movable frame is a cylindrical body surrounding the optical axis of the imaging lens system, and the adjustment insertion part penetrates the protrusion holding part in the radial direction centering on the optical axis, and the position of the adjustment target element When performing the adjustment, it is preferable that the adjustment jig is inserted in the radial direction with respect to the adjustment insertion portion and comes into contact with the adjustment target element.

  The held part is a wall part located on the outer peripheral surface of the protruding holding part and facing in a direction substantially perpendicular to the optical axis. When holding the movable frame by the holding jig, the holding jig is It is preferable that the position of the movable frame in the optical axis direction is determined by being arranged at a position facing the wall portion in the optical axis direction. More specifically, the holding jig is provided with a shaft portion extending in the optical axis direction and a holding projection that is eccentric to the shaft portion, and when holding the movable frame by the holding jig, the optical axis direction After the holding projection is moved, the holding projection is moved in the circumferential direction around the optical axis so that the holding projection faces the wall portion in the optical axis direction.

  In both the lens barrel mode and the lens barrel manufacturing method mode, any adjustment target element can be selected. For example, a lens constituting a part of the imaging lens system can be used as an adjustment target element. In the lens barrel mode, it is preferable that a part of the outer peripheral surface of the lens is exposed to the outside of the housing through the adjustment insertion portion in the state of the functional unit. In the aspect of the manufacturing method, it is preferable that the adjustment jig is brought into contact with the outer peripheral surface of the lens when the position of the adjustment target element is adjusted.

  In both the lens barrel mode and the lens barrel manufacturing method mode, any number and arrangement of the adjustment insertion portion and the held portion provided in the protruding holding portion of the movable frame can be selected. In many cases, in order to improve the stability and accuracy of holding the movable frame, the positions of the holding lens are changed in the circumferential direction around the optical axis of the imaging lens system. It is preferable to provide a holding jig. In addition, in order to improve the stability and accuracy of the position adjustment of the adjustment target element, three adjustment insertion portions (in the manufacturing method, the adjustment insertion portion is changed in the circumferential direction around the optical axis of the imaging lens system). It is preferable to provide an adjustment jig to be inserted.

  According to the lens barrel and the lens barrel manufacturing method of the present invention described above, the lens barrel projects from the housing in the optical axis direction in the state of a functional unit capable of forming a subject image by the imaging lens system and controlling the position of the movable frame. The movable frame is provided with the protruding holding portion. Since the adjustment target element can be accessed through the adjustment insertion portion provided in the protrusion holding portion, the position of the adjustment target element can be adjusted without passing through the opening or notch of the housing. This makes it possible to adjust the position of the adjustment target element easily and with high accuracy without affecting the strength and dustproofness of the lens barrel housing.

It is an exploded perspective view of a lens barrel to which the present invention is applied. It is a front perspective view of a lens barrel. It is a front perspective view of a lens barrel in a state where a front cover frame, a front cover glass, and a front light shielding ring are removed. FIG. 4 is a front perspective view of a part of the lens barrel in the state of FIG. FIG. 4 is a front perspective view in which an adjustment jig and a holding jig are attached to the lens barrel in the state of FIG. 3. FIG. 4 is a front view of the lens barrel in the state of FIG. 3. FIG. 4 is a side view of the lens barrel in the state of FIG. 3. FIG. 7 is a cross-sectional view of the lens barrel taken along line VIII-VIII in FIG. 6. It is a front perspective view which shows the support guide structure of a 1st movable frame and a 2nd movable frame. It is a front perspective view which shows the support guide structure of a 1st movable frame and a 2nd movable frame. It is a front perspective view which shows the support guide structure of a 1st movable frame. It is a front perspective view which shows the support guide structure of the 1st movable frame and the 2nd movable frame in the state which attached the jig | tool for adjustment and the jig | tool for holding | maintenance.

  Hereinafter, a lens barrel 10 according to an embodiment to which the present invention is applied and a method for manufacturing the lens barrel 10 (a method for adjusting an adjustment target element) will be described. As shown in FIG. 8, the imaging lens system constituting the lens barrel 10 is shown as an intersection of the optical axis O (two alternate long and short dash lines orthogonal to FIG. 6 and shown by alternate long and short dashed lines in FIG. 7 and FIG. ) (Hereinafter referred to as the optical axis direction) in order from the front (subject side), a first lens (element to be adjusted) L1, a second lens L2, a third lens L3, and a fourth lens L4. As shown in FIGS. 1 and 2, the front cover glass 11 is positioned in front of the first lens L1. As shown in FIGS. 1, 4 and 8, the rear cover glass 12 is located behind the fourth lens L4. Each of the front cover glass 11 and the rear cover glass 12 has a substantially rectangular plate shape. As shown in FIGS. 1, 4, and 8, the light shielding sheet 13 is located behind the third lens L <b> 3, and the light shielding sheet 14 is located behind the rear cover glass 12. The light shielding sheet 13 has an annular shape surrounding the substantially circular opening, and the light shielding sheet 14 has a square frame shape surrounding the substantially rectangular opening. As shown in FIGS. 1 and 8, the image sensor 15 is located behind the light shielding sheet 14. The first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are optical elements having positive or negative power, and reflected light from the subject is reflected from the first lens L1 to the fourth lens L4. An image is formed on the light receiving surface of the image sensor 15 through the image sensor 15. Both the front cover glass 11 and the rear cover glass 12 are translucent members in which both the incident side surface and the emission side surface are substantially perpendicular to the optical axis O, and have no positive or negative power.

  The lens barrel 10 has a rectangular tube-shaped housing (a casing, a cylindrical member) 20. As shown in FIGS. 4 and 8, the housing 20 has an internal space penetrating in the optical axis direction. A first movable frame 21 that holds the first lens L1 and a second movable frame 22 that holds the second lens L2 and the third lens L3 are supported in the housing 20 so as to be independently movable in the optical axis direction. ing. The fourth lens L4 and the light shielding sheet 14 are fixedly supported inside a support frame portion 20a formed inside the housing 20, and do not move in the optical axis direction. The image pickup device 15 is supported by the image pickup device substrate 15a, and is attached to a position where the image pickup device substrate 15a covers the opening on the rear end side of the housing 20, as shown in FIGS.

  The housing 20 has side walls 20b and 20c facing each other with the optical axis O interposed therebetween, and an upper wall 20d and a bottom wall 20e connecting the side walls 20b and 20c as peripheral walls surrounding the imaging lens system. Each of the side wall 20b and the side wall 20c has recesses 20f and 20g in which a part of the outer surface is recessed. The recess 20f is formed with a through hole 20h (FIG. 1) penetrating the side wall 20b and a pair of engaging protrusions 20i (FIGS. 1 and 7) positioned on the front and rear in the optical axis direction across the through hole 20h. ing. A through hole 20j (FIG. 1) penetrating the side wall 20c and an engaging protrusion 20k (FIGS. 2, 3, and 5) located behind the through hole 20j are formed in the recess 20g. Near the front end of the housing 20, two engaging protrusions 20m and three engaging protrusions 20n are formed. As shown in FIG. 6, one engagement protrusion 20m is provided on each of the side walls 20b and 20c, and one engagement protrusion 20n is provided on each of the side walls 20b, 20c, and the upper wall 20d. Further, a support seat 20p (FIGS. 1 to 5 and 7) and a screw hole 20q (FIG. 1) are formed at the boundary between the side wall 20b and the bottom wall 20e at the front end of the housing 20, and the side wall 20c and the bottom wall 20e. A support seat 20r (FIGS. 1 to 3, 5, and 6) and a screw hole 20s (FIGS. 1 and 6) are formed at the boundary portion of the upper wall 20d, and a positioning projection 20t ( 1 and 6), and a positioning projection 20u (FIGS. 1, 6, and 8) is formed on the bottom wall 20e.

  The bottom wall 20e of the housing 20 is largely open, and a motor support plate 23 that covers this open portion is attached. The motor support plate 23 is fixed to the housing 20 by four motor fixing screws 24. As shown in FIG. 1, a first motor (drive source) 25 and a second motor 26 are supported on the motor support plate 23. Each of the first motor 25 and the second motor 26 includes motor housings 25a and 26a each including a stator and a rotor, and drive shafts (drive transmission mechanisms) 25b and 26b each having an external thread formed on an outer peripheral surface thereof. Yes. As shown in FIG. 4, the motor housing 25a of the first motor 25 is in a position overlapping the support frame portion 20a in the housing 20 in the optical axis direction, and the drive shaft 25b protrudes forward from the motor housing 25a. . The second motor 26 is arranged side by side with the first motor 25, and, like the first motor 25, a drive shaft 26 b projects forward from the motor housing 26 a. The drive shaft 25b and the drive shaft 26b are each driven to rotate about a rotation axis substantially parallel to the optical axis O.

  As shown in FIG. 1, a lens FPC 27 and a lens FPC 28 are extended from the motor support plate 23. The lens FPC 27 is provided with a lens position sensor 29, and the lens FPC 28 is provided with a lens position sensor 30. As shown in FIGS. 2, 3 and 5, the lens FPC 27 is supported along the recess 20g of the side wall 20b, and the lens position sensor 29 is inserted into the through hole 20j. As shown in FIG. 7, the lens FPC 28 is supported along the recess 20f of the side wall 20c, and the lens position sensor 30 is inserted into the through hole 20h. Each of the lens position sensor 29 and the lens position sensor 30 is a photo interrupter having a light emitting portion and a light receiving portion arranged to face each other.

  A cover sheet metal 31 is attached to the outside of the housing 20. The cover metal plate 31 includes a bottom plate 31a that covers the motor support plate 23 and a pair of side plates 31b and 31c that protrude from both sides of the bottom plate 31a. As shown in FIG. 7, the side plate 31b overlaps the recess 20f of the side wall 20b, and a pair of engagement holes 31d formed in the side plate 31b engages with the pair of engagement protrusions 20i. As shown in FIGS. 2, 3 and 5, the side plate 31c overlaps the recess 20g of the side wall 20c, and an engagement hole 31e formed in the side plate 31c engages with the engagement protrusion 20k. The cover metal plate 31 is held with respect to the housing 20 by the engagement of the engagement holes 31d and the engagement holes 31e with the engagement protrusions 20i and 20k. In this holding state, the pressing piece 31g provided on the side plate 31c presses the vicinity of the lens position sensor 29 of the lens FPC 27 from the outside, and the pressing piece 31f provided on the side plate 31b sets the vicinity of the lens position sensor 30 of the lens FPC 28 outside. Hold from.

  In the housing 20, four guide shafts 35, 36, 37 and 38 each extending in the optical axis direction are supported. Each of the guide shafts 35, 36, 37, and 38 is a shaft body having a uniform circular cross section in the optical axis direction, and the rear ends of the guide shafts 35, 36, 37, and 38 are connected to the support frame portion 20 a of the housing 20. It is inserted into the formed shaft support hole (not shown) to receive support. As shown in FIGS. 3 to 6, the front ends of the guide shafts 35, 36, 37, and 38 are respectively inserted into shaft support holes 40a, 40b, 40c, and 40d formed in a guide shaft holder (housing, guide shaft holding member) 40. Inserted and supported. The guide shaft holder 40 is a frame-like body attached to the front end portion of the housing 20, and includes a side portion 41 at a position corresponding to the side wall 20b, a side portion 42 at a position corresponding to the side wall 20c, and an upper wall. An upper side 43 located at a position corresponding to 20d, a bottom side 44 located at a position corresponding to the bottom wall 20e, and a movable frame that is surrounded by these side parts 41, 42, 43, and 44 and penetrates in the optical axis direction. It has an insertion hole (opening) 45. As shown in FIG. 6, the shaft support hole 40a for supporting the guide shaft 35 is formed near the boundary between the side portion 42 and the bottom portion 44, and the shaft support hole 40b for supporting the guide shaft 36 is formed on the side portion 41 and the upper side. A shaft support hole 40c that is formed near the boundary of the portion 43 and supports the guide shaft 37 is formed near the boundary between the side portion 41 and the bottom portion 44, and a shaft support hole 40d that supports the guide shaft 38 is the side portion 42. And near the boundary between the upper side portion 43 and the upper side portion 43.

  The guide shaft holder 40 includes an engagement piece 41a that protrudes rearward from the side part 41, an engagement piece 42a that protrudes rearward from the side part 42, a positioning hole 43a formed through the upper side part 43, and a bottom part. And a contact hole 46 located in the vicinity of the shaft support hole 40c. The contact plate 46 is formed with a screw insertion hole 46a (FIG. 1) penetrating in the optical axis direction. As shown in FIGS. 2 to 8, the guide shaft holder 40 with respect to the housing 20 engages the engagement holes formed in the engagement pieces 41a and 42a with the engagement protrusions 20m, thereby positioning the positioning holes 43a. The positioning projection 20t is inserted into the positioning hole 44a, the positioning projection 20u is inserted into the positioning hole 44a, and the contact plate 46 is in contact with the support seat 20p, and is fixed by the holder fixing screw 47. The holder fixing screw 47 is screwed into the screw hole 20q through the screw insertion hole 46a.

  As shown in FIGS. 9 to 12, the first movable frame 21 includes a cylindrical lens holding frame (protrusion holding portion) 50 that holds the first lens L <b> 1 therein, and a guide sleeve 51 that protrudes from the lens holding frame 50. And a rotation restricting portion 52. The guide sleeve 51 and the rotation restricting portion 52 are in a substantially symmetrical positional relationship with the optical axis O in between. The guide sleeve 51 has a cylindrical shape that is long in the optical axis direction, and extends from the lens holding frame 50 toward the rear in the optical axis direction. A guide hole 51 a through which the guide shaft 35 is inserted is formed at the front end and the rear end of the guide sleeve 51. The guide hole 51 a is a hole having a circular cross-sectional shape that fits in the guide shaft 35 without play, and the first movable frame 21 is supported via the guide shaft 35 so as to be able to move straight in the optical axis direction. The rotation restricting portion 52 has a rotation restricting hole 52a through which the guide shaft 36 is inserted. The rotation restricting hole 52a is a long hole whose longitudinal direction is generally in the radial direction with the optical axis O as the center. The rotation of the movable frame 21 is restricted.

  As shown in FIGS. 9 to 12, the first movable frame 21 includes a spring hook portion 53 and a nut holding portion (drive transmission mechanism) 54 in the vicinity of the guide sleeve 51. One end of a biasing spring 55 that is a tension spring is engaged with the spring hooking portion 53, and the other end of the biasing spring 55 is engaged with a spring hooking portion (not shown) in the housing 20. The first movable frame 21 is urged rearward in the optical axis direction (direction approaching the image sensor 15) by the urging spring 55. As shown in FIG. 4, a drive nut (drive transmission mechanism) 56 that is screwed into the drive shaft 25 b of the first motor 25 is held by the nut holding portion 54. The nut holding portion 54 has a bifurcated protrusion that sandwiches the drive nut 56 from the front and back, and a rotation restricting recess into which a protrusion provided on the drive nut 56 enters. For this reason, the drive nut 56 is restricted in relative movement and rotation (rotation around the drive shaft 25b) in the optical axis direction with respect to the nut holding portion 54, and when the drive shaft 25b rotates, the drive nut 56 becomes a male screw of the drive shaft 25b. The drive nut 56 moves along the optical axis along the optical axis, and the driving force is transmitted from the drive nut 56 to move the first movable frame 21 along the optical axis. The backlash of the first movable frame 21 in the optical axis direction is removed by the biasing force of the biasing spring 55.

  As shown in FIGS. 10 and 11, the first movable frame 21 is provided with a plate-shaped sensor detection piece 57 extending in the optical axis direction. The sensor detection piece 57 passes between the light emitting part and the light receiving part of the lens position sensor 29 by the movement of the first movable frame 21 in the optical axis direction. The position of the first movable frame 21 is controlled by detecting the position where the sensor detection piece 57 blocks the light from the light emitting portion of the lens position sensor 29 as the origin position. The first motor 25 is a pulse motor, and the driving amount (position in the optical axis direction) from the origin position of the first movable frame 21 can be detected by the pulse count of the first motor 25.

  The lens holding frame 50 of the first movable frame 21 is provided with three engagement protrusions 58 at substantially equal intervals in the circumferential direction around the optical axis O. As shown in FIG. 1, a light shielding ring 59 is attached to the front portion of the first movable frame 21. The light shielding ring 59 includes an annular light shielding portion 59a that blocks the incidence of harmful light on the peripheral portion of the first lens L1, and three engagement pieces 59b each having an engagement hole that engages with each engagement protrusion 58. have. The light shielding ring 59 moves integrally with the first movable frame 21 in the optical axis direction.

  As shown in FIGS. 1, 9, 10, and 12, the second movable frame 22 includes a cylindrical lens holding frame 70 that holds the second lens L2 and the third lens L3 therein, and a lens holding frame 70. The guide sleeve 71 and the rotation restricting portion 72 project from the guide sleeve 71. The light shielding sheet 13 is attached to the rear end portion of the lens holding frame 70. The guide sleeve 71 and the rotation restricting portion 72 are substantially symmetrical with respect to the optical axis O. The guide sleeve 71 has a cylindrical shape elongated in the optical axis direction, and has guide holes 71a through which the guide shaft 37 is inserted at the front end and the rear end. The guide hole 71 a is a hole having a circular cross-sectional shape that fits in the guide shaft 37 without play, and the second movable frame 22 is supported via the guide shaft 37 so as to be linearly movable in the optical axis direction. The rotation restricting portion 72 has a rotation restricting hole 72a through which the guide shaft 38 is inserted. The rotation restricting hole 72 a is a long hole whose longitudinal direction is substantially in the radial direction centered on the optical axis O, and is a second hole centered on the guide shaft 37 (guide hole 71 a) by the guide shaft 38 and the rotation restricting portion 72. The rotation of the movable frame 22 is restricted.

  As shown in FIGS. 1, 9, 10, and 12, the second movable frame 22 includes a spring hook portion 73 and a nut holding portion 74 in the vicinity of the guide sleeve 71. One end of a biasing spring 75 that is a tension spring is engaged with the spring hooking portion 73, and the other end of the biasing spring 75 is engaged with a spring hooking portion (not shown) in the housing 20. The second movable frame 22 is urged rearward in the optical axis direction (direction approaching the image sensor 15) by the urging spring 75. A drive nut 76 (FIG. 1) that is screwed into the drive shaft 26 b of the second motor 26 is held by the nut holding portion 74. The nut holding portion 74 has a bifurcated protrusion that sandwiches the drive nut 76 from the front and back, and a rotation restricting recess into which a protrusion provided on the drive nut 76 enters. Therefore, the drive nut 76 is restricted in relative movement and rotation (rotation around the drive shaft 26b) in the optical axis direction with respect to the nut holding portion 74, and when the drive shaft 26b rotates, The drive nut 76 moves along the optical axis along the optical axis, the driving force is transmitted from the drive nut 76, and the second movable frame 22 moves in the optical axis direction. The backlash of the second movable frame 22 in the optical axis direction is removed by the biasing force of the biasing spring 75.

  As shown in FIGS. 9 and 12, the second movable frame 22 is provided with a plate-like sensor detection piece 77 extending in the optical axis direction. The sensor detection piece 77 passes between the light emitting part and the light receiving part of the lens position sensor 30 by the movement of the second movable frame 22 in the optical axis direction. The position of the second movable frame 22 is controlled by detecting the position where the sensor detection piece 77 blocks the light from the light emitting portion of the lens position sensor 30 as the origin position. The second motor 26 is a pulse motor, and the drive amount (position in the optical axis direction) from the origin position of the second movable frame 22 can be detected by the pulse count of the second motor 26.

  The lens holding frame 70 of the second movable frame 22 is provided with three engagement protrusions 78 (only one is shown in FIGS. 1 and 10) at substantially equal intervals in the circumferential direction centered on the optical axis O. It has been. As shown in FIG. 1, a light shielding ring 79 is attached to the front portion of the second movable frame 22. The light-shielding ring 79 includes an annular light-shielding portion 79a that blocks the incidence of harmful light on the peripheral portion of the second lens L2, and three engagement pieces 79b each having an engagement hole that engages with each engagement protrusion 78. have. The light shielding ring 79 moves integrally with the second movable frame 22 in the optical axis direction.

  The front cover glass 11 is held by a front cover frame 80. As shown in FIGS. 1 and 2, the front cover frame 80 can be attached to the front end of the housing 20 while covering the guide shaft holder 40 from the front. The front cover frame 80 includes a main body 81 positioned in front of the guide shaft holder 40, a contact plate 82 that can contact the support seat 20 r of the housing 20, and three engagement pieces that protrude rearward from the main body 81. 83. The main body 81 is formed with a substantially rectangular incident opening 81a through which the front cover glass 11 is exposed, penetrating in the optical axis direction. The contact plate 82 is formed with a screw insertion hole 82a (FIG. 1) communicating with the screw hole 20s. The three engagement pieces 83 extend along the side wall 20b, the side wall 20c, and the upper wall 20d of the housing 20, and are formed on the engagement pieces 83 with respect to the three engagement protrusions 20n provided on the housing 20. The holes engage. As shown in FIG. 3, positioning projections 48 are provided on the front surface of the guide shaft holder 40 in the vicinity of the shaft support hole 40 a and the shaft support hole 40 b, respectively. The positioning hole 84 formed in the main body 81 of the 80 engages.

  The front cover frame 80 is fixed to the housing 20 by the front cover frame fixing screw 85 in a state where the position is determined as described above with respect to the housing 20 and the guide shaft holder 40. The front cover frame fixing screw 85 is screwed into the screw hole 20s through the screw insertion hole 82a. With the front cover frame 80 fixed as shown in FIG. 2, the front cover glass 11 covers and protects the front of the first lens L1.

  When assembling the lens barrel 10 having the above-described configuration, the rear end portions of the guide shafts 35, 36, 37, and 38 are inserted into and supported by shaft support portions (not shown) in the housing 20, The second movable frame 22 (the second lens L2, the third lens L3, the light shielding ring 79, and the light shielding sheet 13 are already attached) and the first movable frame 21 (the first lens L1 is already attached) are sequentially inserted into the housing 20 from the front. insert. When adjusting the first lens L1, which will be described later, the light shielding frame 59 is not attached to the first movable frame 21 at this stage. After inserting the second movable frame 22 and the first movable frame 21, the guide shaft holder 40 is attached to the housing 20 to support the front end portions of the guide shafts 35, 36, 37 and 38. In this state, a structure for supporting the first movable frame 21 and the second movable frame 22 in the housing 20 so as to be linearly movable in the optical axis direction is completed. As shown in FIG. 8, the fourth lens L4 can be inserted into the support frame portion 20a from the rear in the optical axis direction, and at an arbitrary timing independent of the first movable frame 21 and the second movable frame 22. Can be assembled.

  The imaging lens system of the lens barrel 10 is an optical system capable of zooming, and the first movable frame 21 (first lens L1) and the second movable frame 22 (first lens) are driven by the driving force of the first motor 25 and the second motor 26. The zooming operation (zooming) is performed by moving the second lens L2 and the third lens L3) along a predetermined locus in the optical axis direction. Further, a focusing operation (focusing) is performed by moving the first movable frame 21 (first lens L1) along a predetermined locus in the optical axis direction by the driving force of the first motor 25. The optical axes of the first movable frame 21 and the second movable frame 22 are assembled by assembling the motor support plate 23 supporting the first motor 25 and the drive nut 56 and the second motor 26 and the drive nut 76 to the housing 20. Directional position control is possible.

  That is, the first movable frame 21 and the second movable frame 22 can be moved straight in the optical axis direction via the guide shafts 35, 36, 37, and 38 with respect to the housing constituted by the housing 20 and the guide shaft holder 40. The lens barrel 10 is supported by the motors 25 and 26 and the drive nuts 56 and 76, so that the lens barrel 10 can image the subject at a predetermined position by the imaging lens system (from the first lens L1 to the fourth lens L4). It becomes a functional unit of the 1st state which can connect. FIG. 4 shows the functional unit in the first state.

  Further, a rear cover glass 12, a light shielding sheet 14, and an image pickup device 15 (image pickup device substrate 15a) are assembled behind the fourth lens L4, so that a subject image formed on the light receiving surface of the image pickup device 15 can be picked up. It becomes a functional unit in the state of 2. 3 and 5 to 8 show the functional unit in the second state.

  In the functional units in the first and second states shown in FIGS. 3 to 8, the front cover glass 11 and the front cover frame 80 are not assembled, and the front side of the guide shaft holder 40 is exposed. Further, the light shielding ring 59 is not assembled to the first movable frame 21. Since the front cover glass 11 is a translucent member having no power, it does not participate in the formation of the subject image, and the subject image can be formed and captured even in a functional unit in which the front cover glass 11 and the front cover frame 80 are not assembled. Is possible.

  As shown in FIGS. 3 to 8, in the functional unit of the lens barrel 10, a part of the lens holding frame 50 of the first movable frame 21 is forward from the guide shaft holder 40 through the movable frame insertion hole 45 in the optical axis direction. Can project toward. 3 to 8 show a state where the position of the first movable frame 21 in the optical axis direction is at a predetermined adjustment position for adjusting the position of the first lens L1. The protrusion amount Z from the front surface of the guide shaft holder 40 to the tip of the lens holding frame 50 in this state is shown in FIG. Note that the front surface of the guide shaft holder 40 serving as a reference for the protrusion amount Z means the foremost flat portion excluding the protrusion shape formed by the contact plate 46 and the positioning protrusion 48. Front side recesses 41b, 42b, 43b and 44b are formed in the side part 41, the side part 42, the upper part 43 and the bottom part 44 of the guide shaft holder 40 so as to be recessed with respect to the front surface.

  As shown in FIGS. 3 to 6 and 9 to 12, the lens holding frame 50 has three adjustment groove portions (adjustment insertion portions) 60 at substantially equal intervals in the circumferential direction around the optical axis O. The three holding pin guide grooves 61 are formed so as to have different positions in the circumferential direction from the respective adjustment groove portions 60. As shown in FIG. 6, the three holding pin guide grooves 61 are also arranged so that their circumferential intervals are substantially equal. Further, four adhesive recesses 62 are formed in the circumferential direction inside the inner peripheral surface of the lens holding frame 50 so as to be different from the adjustment groove 60 and the holding pin guide groove 61 in the circumferential direction.

  Each adjustment groove 60 is a groove that penetrates in the radial direction around the optical axis O and is open to the front end side of the lens holding frame 50. As shown in FIG. 8, each adjustment groove 60 is included in the range of the projection amount Z of the lens holding frame 50 from the front surface of the guide shaft holder 40. Therefore, at the adjustment position of the first movable frame 21, the outer peripheral surface L1a of the first lens L1 is exposed to the outside of the functional unit through each adjustment groove 60.

  As shown in FIGS. 5 and 12, for each of the three adjustment groove portions 60, adjustment pins (adjustments) are directed from the outer side in the radial direction around the optical axis O to the inner side (direction approaching the optical axis O). Jig) 65 can be inserted. Each adjustment pin 65 has a cylindrical shape and is inserted into the adjustment groove 60 with the axis line in the radial direction centered on the optical axis O. When a predetermined amount of the adjustment pin 65 is inserted into each adjustment groove 60, the tip of the adjustment pin 65 comes into contact with the outer peripheral surface L1a of the first lens L1. As shown in FIG. 8, a predetermined adjustment clearance is formed in the radial direction between the outer peripheral surface L1a of the first lens L1 and the inner peripheral surface of the lens holding frame 50. The position of the first lens L1 can be changed in the lens holding frame 50. Therefore, the position of the first lens L1 along the plane perpendicular to the optical axis O is adjusted (aligned) by changing the radial positions of the three adjusting pins 65 (the amount of insertion into the adjusting groove 60). Can do.

  As shown in FIG. 6, front concave portions 41 b, 42 b and 43 b of the guide shaft holder 40 are provided at positions corresponding to the three adjustment groove portions 60 in the circumferential direction around the optical axis O. The space on the outer diameter side of each adjustment groove 60 is widened by the front recesses 41b, 42b and 43b, and the adjustment pin 65 can be easily inserted.

  Each holding pin guide groove 61 is a groove opened to the outer peripheral side and the front end side of the lens holding frame 50, the groove width in the circumferential direction is narrow at the open part on the front end side, and at the rear part from the open part at the front end. The circumferential groove width is widened. Due to the difference in the groove width, a wall portion facing the direction substantially orthogonal to the optical axis O is provided on the outer peripheral surface of the lens holding frame 50 at a location adjacent to the open portion on the front end side of each holding pin guide groove 61. A held wall (held portion) 63 is formed. As shown in FIG. 8, the held wall 63 is included in the region of the protrusion amount Z where the lens holding frame 50 protrudes from the front surface of the guide shaft holder 40 at the adjustment position of the first movable frame 21.

  As shown in FIGS. 5 and 12, a holding pin (holding jig) 66 is attached to a portion where the three held walls 63 are provided. Each holding pin 66 has an engaging projection 68 that is eccentric (projects in the radial direction) with respect to the shaft portion 67 in the vicinity of one end of the cylindrical shaft portion 67, and the shaft portion 67 extends in the optical axis direction. The engagement protrusion 68 is inserted so as to be positioned behind the held wall 63 (backward in the optical axis direction). In this inserted state, the to-be-held wall 63 and the engaging protrusion 68 abut and hold the first movable frame 21 at a predetermined position in the optical axis direction. Further, the shaft portion 67 of each holding pin 66 is positioned along the outer peripheral surface of the held wall 63 and holds the first movable frame 21 at a predetermined position in a plane perpendicular to the optical axis O.

  When attaching each holding pin 66, the position of the engaging projection 68 is aligned with the opening on the front end side of the holding pin guide groove 61, and the holding pin 66 is inserted rearward in the optical axis direction. The holding pin 66 may be moved in the circumferential direction around the center so that the engaging protrusion 68 is positioned behind the held wall 63. As a result, a space for moving each holding pin 66 in the radial direction is not provided, and a holding state by the holding pin 66 can be achieved with a space-saving structure.

  As shown in FIG. 6, front concave portions 41 b, 42 b and 44 b of the guide shaft holder 40 are provided at positions corresponding to the three holding pin guide grooves 61 in the circumferential direction around the optical axis O. When the holding pins 66 are in the insertion state shown in FIGS. 5 and 12, a part of the shaft portion 67 enters the front recesses 41b, 42b, and 44b.

  The protrusion amount Z of the lens holding frame 50 from the guide shaft holder 40 at the adjustment position of the first movable frame 21 is adjusted without significantly reducing the strength and dustproofness of the first drive frame 21 and the guide shaft holder 40. The size is set such that the pin 65 and the holding pin 66 can be easily inserted and removed.

  The position adjustment of the first lens L1 using the three adjustment pins 65 is performed by configuring the lens barrel 10 as a functional unit and then arranging three holding pins arranged at approximately equal intervals in the circumferential direction with the optical axis O as the center. 66, the first movable frame 21 is held. Since the first movable frame 21 is held by the three holding pins 66, the first movable frame 21 is not displaced even when a load accompanying adjustment is applied, and the first movable frame 21 is precisely based on the lens holding frame 50 of the first movable frame 21. With this, stable adjustment work can be performed.

  As shown in FIG. 11, in the first movable frame 21, in particular, a guide shaft 35 and a guide sleeve 51, which are main rectilinear guide portions, and a drive nut 56 and a nut holding portion 54 that transmit driving force from the first motor 25. Since they are arranged close to each other, the structure is likely to be displaced when a load is applied to a position away from the linear guide portion and the drive transmission portion. It should be noted that the guide shaft 36 and the rotation restricting portion 52 located away from the guide shaft 35 and the guide sleeve 51 have a high effect of suppressing rotation around the axis parallel to the optical axis O. In order to avoid interference with the guide, a clearance is secured in the direction other than the rotation direction, and the displacement of the first movable frame 21 at the time of adjustment using the adjustment pin 65 is suppressed only by the guide shaft 36 and the rotation restricting portion 52. Is difficult. Therefore, holding by the three holding pins 66 is extremely effective for suppressing displacement of the first movable frame 21 during lens adjustment.

  Since the three adjustment pins 65 directly access and adjust the position of the first lens L1 to be adjusted, the first movable frame 21 that supports the first lens L1 and the guide that supports the first movable frame 21 are used. The shafts 35 and 36 do not operate during adjustment. Therefore, highly accurate and highly flexible lens adjustment is possible without being affected by the support structure and support accuracy of the first movable frame 21 and the guide shafts 35 and 36. Further, since it is not necessary to secure a space for operating the first movable frame 21 and the guide shafts 35 and 36 for adjustment, the first lens L1 can be adjusted with a space-saving configuration.

  When the position adjustment of the first lens L <b> 1 is completed, an adhesive is injected into each bonding recess 62 to fix the first lens L <b> 1 to the first movable frame 21. After fixing the first lens L1, the adjustment pin 65 and the holding pin 66 are removed.

  Subsequently, the light shielding ring 59 is attached to the first movable frame 21. As shown in FIG. 6, in the state of the functional unit, there is a radial gap between the formation position of the three engagement protrusions 58 in the lens holding frame 50 and the movable frame insertion hole 45 of the guide shaft holder 40. The three engagement pieces 59b of the light shielding ring 59 can be inserted into the radial gap. In the middle of insertion, each engagement piece 59b elastically deforms in the outer diameter direction over the engagement projection 58, and when each engagement piece 59b is inserted to a position where it passes through the corresponding engagement projection 58, each engagement piece 59b is inserted. The elastic deformation of the joint piece 59b is eliminated, and each engagement protrusion 58 is engaged in the engagement hole of each engagement piece 59b in a so-called snap-fit form. By this engagement, the light shielding ring 59 is held by the first movable frame 21. The held light shielding ring 59 covers the adjustment groove portion 60, the holding pin guide groove 61, and the bonding concave portion 62 formed in the lens holding frame 50 from the front with the light shielding portion 59a.

  Furthermore, as shown in FIG. 2, the lens barrel 10 is completed by assembling the front cover glass 11 and the front cover frame 80 that cover the front of the first lens L <b> 1 and the guide shaft holder 40. The front cover frame 80 covers a region of the lens holding frame 50 on the outer peripheral side of a portion protruding forward from the guide shaft holder 40. Accordingly, in the state of the functional unit shown in FIGS. 3 to 8, the adjustment groove 60 that has exposed the outer peripheral surface L1a of the first lens L1 to the outside is in a light tight state by the assembly of the light shielding ring 59 and the front cover frame 80. It is covered and the incidence of harmful light from the peripheral edge of the first lens L1 can be prevented.

  As described above, in the lens barrel 10, the positions of the movable frames 21 and 22 can be controlled by motor drive, and a subject image can be formed on the light receiving surface of the image sensor 15 by the photographing lens system (that is, substantially optically). The lens holding frame 50 of the first movable frame 21 is protruded in the optical axis direction from the housing constituted by the housing 20 and the guide shaft holder 40 in the state of the functional unit (functioning as a device) (FIGS. 3 to 8). Can do. An adjustment groove 60 that enables access to the first lens L1 for position adjustment and a held wall 63 for holding the first movable frame 21 are provided on the protruding portion of the lens holding frame 50. Yes. Then, in a state where the held wall 63 of the first movable frame 21 is held using the three holding pins 66, the three adjustment pins 65 are inserted into the adjustment groove 60 to adjust the position of the first lens L1.

  According to such a configuration and manufacturing method of the lens barrel 10, the first lens L1 is accessed without providing a jig insertion opening (through portion) in the housing 20 and the guide shaft holder 40 constituting the housing. Since adjustment work can be performed, there is no effect on the strength of the housing or the dustproofness in the housing. Since the adjustment pin 65, which is an adjustment jig, can be attached and operated without being restricted by the internal structure of the housing, the first lens L1 can be easily adjusted with a space-saving and simple structure. be able to. In addition, since a held wall 63 that is a held portion is provided in a portion of the first movable frame 21 that protrudes from the housing, the holding pin 66 that is a holding jig can be easily and reliably attached. Can do. And the displacement of the 1st movable frame 21 is suppressed by holding | maintenance of the holding pin 66, and the highly accurate adjustment of the 1st lens L1 is realizable. In particular, the first lens L1 is a lens having the largest diameter in the imaging lens system of the lens barrel 10 (see FIG. 8) and has high adjustment sensitivity. Therefore, the configuration and manufacturing method of the present embodiment that can realize highly accurate adjustment with excellent workability are suitable.

  The present invention is not limited to the embodiment described above, and can be modified within the scope of the gist of the invention. For example, although the lens barrel 10 in the illustrated embodiment has the first lens L1 that is the foremost lens in the optical axis direction as an adjustment target, the present invention is located at any of the front and rear ends of the housing of the lens barrel. It can also be applied to the adjustment target element. As a specific modification, when the fourth lens L4 which is the rearmost in the optical axis direction of the imaging lens system is movable in the optical axis direction, the present invention can be applied as a structure and method for adjusting the fourth lens L4. It is. In this modification, a part of a movable frame (movable in the optical axis direction) that holds the fourth lens L4 is protruded rearward in the optical axis direction from the housing 20, and the protruding portion of the movable frame is the lens holding frame of the illustrated embodiment. 50 may be configured similarly. The adjustment of the fourth lens L4 in this modification is performed on the functional unit in a state where the image sensor 15 is not attached (corresponding to the state of FIG. 4). Even in the functional unit excluding the image pickup device 15, the structure relating to the support and driving of the image pickup lens system is completed, so that a subject image can be formed.

  In the lens barrel 10 of the illustrated embodiment, the position of the first lens L1 is adjusted (so-called shift adjustment) along a plane perpendicular to the optical axis O, but the inclination of the first lens L1 with respect to the optical axis O is changed. The present invention can also be applied to adjustments of different modes such as adjustment (so-called tilt adjustment). While changing the contact position of each adjustment pin 65 with respect to the first lens L1 and the operation mode of each adjustment pin 65 while using the configuration of the lens barrel 10 of the embodiment, it can be changed to a mode in which tilt adjustment is performed. is there.

  In the illustrated embodiment, when adjusting the position of the first lens L1, each adjustment pin 59 is inserted into each adjustment groove 60 from the outer diameter direction, so that each adjustment groove 60 has a shape penetrating in the radial direction. . Unlike this configuration, each adjustment groove 60 has a bottomed groove shape with the outer diameter side (the outer peripheral side of the lens holding frame 50) closed, and the adjustment groove 60 is adjusted in the optical axis direction with respect to each adjustment groove 60. A configuration in which a jig is inserted is also possible.

  As a modified example of the relationship between the holding pin 66 and the first movable frame 21, the position of the held wall 63 is set forward in the optical axis direction from the position of the illustrated embodiment, and the engaging protrusion 68 of the holding pin 66 It is also possible to configure such that it can be inserted into and removed from the rearward position of the held wall 63 by moving in the radial direction around the axis O. In this modification, not the wide groove (groove opened at the front end of the lens holding frame 50) allowing the engagement protrusion 68 to move in the circumferential direction like the holding pin guide groove 61 but the rear side of the held wall 63. What is necessary is just to provide the small recessed part which can insert the engagement protrusion 68 in this. Further, in this modification, with the holding pin 66 attached, the entire shaft portion 67 is positioned in front of the front surface of the guide shaft holder 40, and the front recesses 41b, 42b and 44b are omitted (the guide shaft holder 40). It is possible to make the front surface of the entire surface flat.

  In the illustrated embodiment, the held wall 63 is formed as a remaining portion in which the holding pin guide groove 61 is formed on the outer peripheral surface of the lens holding frame 50. This configuration is excellent in space efficiency in the radial direction because it is possible to obtain a portion with which the engaging protrusion 68 of the holding pin 66 engages without increasing the thickness of the lens holding frame 50. However, when there is a sufficient space in the radial direction, as a protrusion protruding in the outer radial direction from the outer peripheral surface of the lens holding frame 50 (that is, without providing a concave portion on the outer peripheral surface such as the holding pin guide groove 61). It is also possible to form a portion corresponding to the held wall 63 (a wall portion facing in a direction substantially orthogonal to the optical axis O).

  In the illustrated embodiment, the engagement protrusion 68 of the holding pin 66 is in contact with the held wall 63 of the first movable frame 21 from the rear in the optical axis direction. In addition to this, a portion that abuts against the held wall 63 from the front in the optical axis direction is provided in a holding jig corresponding to the holding pin 66, and the holding jig is held from the front and rear in the optical axis direction. It is also possible to sandwich 63.

  In the illustrated embodiment, the tip of the adjustment pin 65 contacts the first lens L1, but the adjustment target element according to the present invention is not limited to the lens. For example, instead of a structure in which the first lens L1 is directly held by the first movable frame 21, a lens frame that holds the first lens L1 fixedly is provided, and this lens frame is held by the first movable frame 21. It can also be applied to other structures. In this case, the position of the lens frame and the first lens L1 can be adjusted integrally by bringing the tip of the adjustment pin 65 into contact with the lens frame. That is, the lens frame is a direct adjustment target element.

  In the illustrated embodiment, each lens from the first lens L1 to the fourth lens L4 constituting the imaging lens system is shown as one lens, but the first lens L1, the second lens L2, the third lens L3, and the fourth lens are shown. Any or all of the lenses L4 may be a lens group including a plurality of lenses. For example, when a lens group including a plurality of lenses is used instead of the first lens L1 in the illustrated embodiment, it is desirable to perform adjustment on the entire lens group, and thus a lens group frame that holds the lens group is provided. The lens group frame is held by the first movable frame. Then, the adjustment pin 65 may be brought into contact with the lens group frame so that the position of the entire lens group is adjusted along with the lens group frame.

  In addition, since the present invention can be adjusted easily and with high accuracy, it is suitable for a case where a lens is included in a part that is moved by adjustment regardless of direct or indirect, but a lens is included in a part that is affected by the adjustment. It can also be applied to cases where there is not.

DESCRIPTION OF SYMBOLS 10 Lens barrel 11 Front cover glass 12 Rear cover glass 13 Light shielding sheet 14 Light shielding sheet 15 Image pick-up element 15a Image pick-up element board | substrate 20 Housing (casing, cylindrical member)
20a Support frame part 20b 20c Side wall (peripheral wall)
20d Upper wall (surrounding wall)
20e Bottom wall (surrounding wall)
20f 20g Recess 20h 20j Through hole 20i 20k 20m 20n Engagement protrusion 20p 20r Support seat 20q 20s Screw hole 20t 20u Positioning protrusion 21 First movable frame (movable frame)
22 Second movable frame 23 Motor support plate 24 Motor fixing screw 25 First motor (drive source)
25a Motor housing 25b Drive shaft (drive transmission mechanism)
26 Second motor 26a Motor housing 26b Drive shaft 27 28 Lens FPC
29 30 Lens position sensor 31 Cover metal plate 31a Bottom plate 31b 31c Side plate 31d 31e Engagement hole 31f 31g Holding piece 35 36 37 38 Guide shaft 40 Guide shaft holder (housing, guide shaft holding member)
40a 40b 40c 40d Shaft support hole 41 42 Side part 41a 42a Engagement piece 41b 42b Front recess 43 Upper side 43a Positioning hole 43b Front recess 44 Bottom side 44a Positioning hole 44b Front recess 45 Movable frame insertion hole (opening)
46 Contact plate 46a Screw insertion hole 47 Holder fixing screw 48 Positioning protrusion 50 Lens holding frame (projection holding part)
51 Guide sleeve 52 Rotation restricting portion 53 Spring hook portion 54 Nut holding portion (drive transmission mechanism)
55 Biasing spring 56 Drive nut (drive transmission mechanism)
57 Sensor detection piece 58 Engaging projection 59 Shading ring 60 Adjustment groove (adjustment insertion part)
61 Holding Pin Guide Groove 62 Adhesive Recess 63 Hold Wall (Hold)
65 Adjustment pin (Adjustment jig)
66 Holding pin (holding jig)
67 Shaft 68 Engagement projection 70 Lens holding frame 71 Guide sleeve 72 Rotation restricting portion 73 Spring hooking portion 74 Nut holding portion 75 Energizing spring 76 Drive nut 77 Sensor detection piece 78 Engagement projection 79 Light shielding ring 80 Front cover frame 81 Main body Portion 81a Incident opening 82 Contact plate 82a Screw insertion hole 83 Engagement piece 84 Positioning hole 85 Front cover frame fixing screw L1 First lens (imaging lens system, adjustment target element)
L2 Second lens (imaging lens system)
L3 Third lens (imaging lens system)
L4 4th lens (imaging lens system)
O Optical axis Z Projection amount of lens holding frame in the optical axis direction

Claims (15)

A housing that internally holds an imaging lens system that forms a subject image;
A movable frame supported so as to be movable in the optical axis direction of the imaging lens system along a guide axis supported in the housing, and holding an adjustment target element;
A lens barrel including a drive transmission mechanism that transmits a driving force in the optical axis direction from a driving source to the movable frame;
The movable frame is
In the state of the functional unit in which the subject image is formed by the imaging lens system and the position of the movable frame in the optical axis direction can be controlled via the guide shaft and the drive transmission mechanism, A projecting holding part that can project at least a part in the optical axis direction from the front end or the rear end, and holds the adjustment target element in a state that allows position adjustment;
For adjustment, which is provided in the projecting holding portion, exposes a part of the adjustment target element to the outside of the housing in the state of the functional unit, and enables the position adjustment of the adjustment target element through the exposed portion. A lens barrel comprising an insertion portion.   2. The lens barrel according to claim 1, wherein the protruding holding portion is a cylindrical body surrounding an optical axis of the imaging lens system, and the adjustment insertion portion protrudes and holds in a radial direction around the optical axis. A lens barrel that penetrates the part.   3. The lens barrel according to claim 2, wherein the movable frame is located on an outer peripheral surface of the protruding holding portion and has a held portion including a wall portion facing in a direction substantially orthogonal to the optical axis. Tube.   4. The lens barrel according to claim 2, wherein the adjustment target element is a lens that constitutes a part of the imaging lens system, and the outer peripheral surface of the lens is passed through the adjustment insertion portion in the state of the functional unit. A lens barrel that is partially exposed to the outside of the housing.   5. The lens barrel according to claim 1, wherein the protruding holding portion protrudes from a front end of the housing and receives light passing through the imaging lens system on a rear end side of the housing. 6. Is a lens barrel that is supported. The lens barrel according to any one of claims 1 to 5,
The above housing is
A cylindrical member having a peripheral wall surrounding the imaging lens system and supporting one end of the guide shaft inside;
A guide shaft holding member that is attached to the end of the cylindrical member in the optical axis direction and supports the other end of the guide shaft;
The projection holding portion of the movable frame is a lens barrel protruding in the optical axis direction through an opening penetrating the guide shaft holding member in the optical axis direction.   7. The lens barrel according to claim 1, wherein three adjustment insertion portions are provided at different positions in the circumferential direction around the optical axis of the imaging lens system. The lens barrel.   4. The lens barrel according to claim 3, wherein the held portion is provided with three different positions in the circumferential direction around the optical axis of the imaging lens system. A housing that internally holds an imaging lens system that forms a subject image;
A movable frame supported so as to be movable in the optical axis direction of the imaging lens system along a guide axis supported in the housing, and holding an adjustment target element;
In a manufacturing method of a lens barrel including a drive transmission mechanism that transmits a driving force in the optical axis direction from a driving source to the movable frame,
Forming a functional unit capable of forming the subject image by the imaging lens system and controlling the position of the movable frame in the optical axis direction via the guide shaft and the drive transmission mechanism;
In the state of the functional unit, the protrusion holding portion that is a part of the movable frame is protruded in the optical axis direction from the front end or the rear end of the casing in the optical axis direction,
Attach a holding jig to the held portion provided in the protruding holding portion of the movable frame, hold the movable frame,
An adjustment jig is inserted into the adjustment insertion part provided in the protrusion holding part of the movable frame, and the position of the adjustment target element held in the protrusion holding part so as to be adjustable is adjusted.
After adjusting the position of the adjustment target element, the adjustment target element is fixed to the movable frame, and the holding jig and the adjustment jig are removed from the movable frame. Manufacturing method. In the manufacturing method of the lens-barrel of Claim 9,
The protruding holding portion is a cylindrical body surrounding the optical axis of the imaging lens system,
The adjustment insertion portion passes through the protruding holding portion in a radial direction centered on the optical axis,
When the position adjustment of the adjustment target element is performed, the adjustment jig is inserted in the radial direction with respect to the adjustment insertion portion, and the lens barrel is in contact with the adjustment target element. In the manufacturing method of the lens barrel according to claim 10,
The held portion is a wall portion located on the outer peripheral surface of the protruding holding portion and facing a direction substantially orthogonal to the optical axis,
When the movable frame is held by the holding jig, the holding jig is arranged at a position facing the wall portion in the optical axis direction, and the position of the movable frame in the optical axis direction is set. The lens barrel manufacturing method to be determined. In the manufacturing method of the lens-barrel of Claim 11,
The holding jig includes a shaft portion extending in the optical axis direction, and a holding protrusion that is eccentric with respect to the shaft portion,
When the movable frame is held by the holding jig, the holding projection is moved in the optical axis direction, and then the holding projection is moved in the circumferential direction around the optical axis. A method of manufacturing a lens barrel that faces the wall in the optical axis direction.   The method of manufacturing a lens barrel according to any one of claims 9 to 12, wherein the adjustment target element is a lens constituting a part of the imaging lens system, and when the position adjustment is performed, A method of manufacturing a lens barrel in which the adjustment jig is brought into contact with an outer peripheral surface.   14. The method of manufacturing a lens barrel according to claim 9, wherein the three adjustment jigs provided at different positions in the circumferential direction around the optical axis of the imaging lens system are used. A method of manufacturing a lens barrel that adjusts the position of an adjustment target element.   15. The method of manufacturing a lens barrel according to claim 9, wherein the holding jig is provided by three holding jigs provided at different positions in a circumferential direction around the optical axis of the imaging lens system. A method of manufacturing a lens barrel that holds a held portion.

Images