JP2014106456A - Lens barrel drive part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lens barrel drive part structure in which a gear train to be rotatably driven by a motor and a pair of PI sensors for detecting a rotary direction of a rotary shaft of the motor and a rotation angle thereof can be supported by a single member to be fixed to a housing.SOLUTION: The gear train to be rotatably driven by the motor and the pair of PI sensors for detecting the rotary direction of the motor and the rotation angle thereof are composed of molding made of a single resin material connecting a gear lid supporting the gear train and a PI retainer supporting the pair of PI sensors by a flexible hinge in a lens barrel drive part structure to be fixed to a housing.

Description

  The present invention relates to a lens barrel, and more particularly to a structure of a drive unit including a motor.

  In a lens barrel of a compact camera, a housing has a drive ring (zoom ring) that is driven to rotate about an optical axis, a gear train that meshes with a gear of the drive ring, a drive motor for the gear train, a rotation direction of the motor, and A photo interrupter (PI) for detecting a rotation angle (amount) is supported. The PI is composed of a light-shielding blade fixed to the rotation shaft of the motor and a pair of PI sensors arranged at a predetermined interval with respect to the center of the motor rotation shaft in order to detect the rotation direction and rotation angle of the motor. The gear train is arranged with its rotating shaft oriented in a direction parallel to the rotating shaft (optical axis) of the drive ring gear, and a helical gear (worm wheel) on its input side is provided on the rotating shaft of the motor. I'm biting. The rotation axis of the motor is arranged so as to be located in the plane orthogonal to the optical axis, and the pair of PI sensors are fixed to the flexible substrate and supported by the housing.

Japanese Patent Laid-Open No. 10-134387 JP 2006-011187 A JP 2006-251818 A JP 2008-039895 A JP 2009-058629 A

  In such a lens barrel drive unit structure, how to easily realize a structure for supporting a gear train and arranging a pair of PI sensors at predetermined positions with respect to a housing for fixing a motor is a technology. It is a problem. In particular, the present invention supports a gear train rotated by a motor and a pair of PI sensors for detecting the rotation direction and rotation angle of the rotation shaft of the motor by a single member fixed to the housing. An object of the present invention is to obtain a lens barrel drive unit structure that can be used.

  The present invention supports a motor and a gear train that rotationally drives the drive ring, and a pair of PI sensors for detecting the rotation direction and rotation angle of the rotation shaft of the motor, in a housing that rotatably supports the drive ring. The lens barrel drive section structure includes a gear having a rotation axis parallel to the optical axis, one end of the rotation axis of the gear being supported by the housing, and the other end being the housing. The motor rotating shaft is supported by a fixed gear lid, a worm meshing with an input helical gear in the gear train, a PI light-shielding blade, and the housing A motor fixing wall having a projecting hole of the motor rotating shaft and orthogonal to the motor rotating shaft, for fixing the main body of the motor, a worm insertion opening located on the opposite side of the motor fixing wall from the motor main body, and a PI light shielding blade Insert open When the motor worm and the PI light shielding blade are inserted into the motor fixing wall from the worm insertion opening and the PI light shielding blade insertion opening, the motor is viewed from a direction orthogonal to a direction parallel to the rotation axis of the gear train. A slit that communicates with the projecting hole of the motor rotation shaft for inserting the rotation shaft is formed, and the housing supports the pair of PI sensors sandwiching the PI light shielding blade inserted from the PI light shielding blade insertion opening. Forming a part, having a PI presser that sandwiches the PI sensor supported by the pair of PI sensor support parts between the housing, and the gear cover and the PI presser are integrally molded resin materials It consists of a living hinge cover member connected to each other through a flexible hinge.

  Each of the gear cover and the PI presser of the living hinge cover member preferably has a flat portion on the outer surface thereof, and both the flat portions are substantially perpendicular to each other when fixed to the housing.

  The gear cover of the living hinge cover member can be fixed to the housing with a fixing screw.

  It is preferable that the PI presser of the living hinge cover member is fixed by a locking recess and a locking projection which are formed on one and the other of the PI presser and the housing.

  The motor fixing wall of the housing is formed with a pair of fixing screw insertion holes for fixing the motor body and the projecting hole of the motor rotating shaft arranged in parallel to the rotating shaft of the helical gear of the gear train. It is practical to do.

  The pair of PI sensors are preferably arranged symmetrically with respect to a plane passing through the motor rotation axis and the slit center.

  The worm insertion opening and the PI shading blade insertion opening can be opened on the optical axis parallel surface of the housing.

  The housing includes a gear train supporting wall having an optical axis orthogonal plane portion supporting one end portion of the shaft of the gear train, and a motor fixing wall that fixes the motor body perpendicular to the gear train supporting wall and the motor rotation shaft. And an optical axis parallel surface having a worm insertion opening and a PI light shielding blade insertion opening located on the opposite side of the motor fixing wall from the motor body.

  The housing may include a pair of PI sensor support portions that are positioned on both outer sides of the slit on the opposite side of the motor fixing wall from the motor body and sandwich the PI light shielding blade.

  According to the present invention, in a lens barrel drive unit structure in which a gear train that is rotationally driven by a motor and a pair of PI sensors for detecting the rotational direction and rotational angle of the motor are fixed to a housing, the gear train is Since the supporting gear cover and the PI presser supporting the pair of PI sensors are formed from a single resin material molded product connected by a flexible hinge, the number of parts can be reduced and the assembly cost can be reduced. .

It is a perspective view which shows the use condition of the zoom lens barrel to which the drive part structure of the lens barrel of this invention is applied. (A) of the drive part structure of the zoom lens barrel is a front view showing a zoom lens and a gear train, and (B) is a front view showing an input gear in the zoom lens and gear train. FIG. 3 is a partially cut bottom view showing a drive unit structure portion of the zoom lens barrel by cutting a motor fixing wall along an optical axis O. It is a perspective view which shows the drive part structure of the zoom lens barrel in the state before mounting | wearing with a gear cover and PI presser. It is a perspective view which shows the drive part structure of the same zoom lens barrel in the state which removed the gear cover and PI presser and made the flexible substrate invisible. (A) and (B) of the zoom lens barrel drive unit structure are perspective views of the living hinge lid member in a state where molding is completed from the front and back sides, and (C) and (D) drive the living hinge lid member. It is the perspective view which looked at the state which bent the gear lid and PI presser at right angles via a flexible hinge in order to attach to a part support part from the front and back. 2A and 2B are a perspective view and a front view, respectively, showing a zooming motor having a drive unit structure of the zoom lens barrel. (A), (B) is a figure which shows the example of a different arrangement | positioning of a pair of PI sensor in the drive part structure of the zoom lens barrel.

  FIG. 1 to FIG. 5 show an embodiment of a lens barrel drive structure according to the present invention. The lens barrel housing (block) 10 is made of a molded product of a synthetic resin material, and a drive unit support portion 12 is formed outside the cylindrical portion 11. The cylindrical portion 11 has an optical axis O (axial center of the cylindrical portion 11) on its inner periphery while being rotated or constrained by the rotation of the driving ring (rotating ring) 13 and the driving ring 13. A plurality of lens barrels 13a and 13b that move forward and backward in the direction and a lens group (illustration of the first lens group L) are supported. These lens groups are zooming lens groups, and are driven between the storage position and the photographing position and between the short focal length end and the long focal length end within the photographing position by the rotation of the drive ring 13. Such a zooming mechanism is well known, and the present invention does not ask for its configuration, so that illustration of a specific example is omitted.

  The drive unit support unit 12 includes a zooming motor 21, a gear train 22 that transmits the rotation of the zooming motor 21 to the drive ring 13, and a PI (photo interrupter) that detects a rotation direction and a rotation angle (amount) of the zooming motor 21. It supports a pair of PI sensors 23 and is provided in one quadrant of the four quadrants centered on the optical axis O (see FIGS. 2A and 3). The drive part support part 12 bulges in the radial direction on the outer periphery of the cylindrical part 11, and the area of the drive part support part 12 is the outer periphery of the cylindrical part 11, and is spaced back and forth in the optical axis direction orthogonal to the optical axis O Virtual first and second optical axis orthogonal planes S1 and S2 (FIGS. 3 and 4), and first and second orthogonal to the first and second optical axis orthogonal planes S1 and S2 and orthogonal to each other The optical axis parallel plane (plane parallel to the optical axis O) S3 and S4 (FIGS. 2A, 3 and 4).

  The driving unit support 12 includes a motor fixing wall 14 that supports the zooming motor 21, a gear train support wall 15 that supports the gear train 22, and a pair of PI sensor supports 16 that support the pair of PI sensors 23. It has been. The motor fixing wall 14 is orthogonal to the first and second optical axis orthogonal surfaces S1 and S2, orthogonal to the first optical axis parallel surface S3, and parallel to the second optical axis parallel surface S4 (optical axis parallel surface). ). The motor fixing wall 14 is formed with a projecting hole 14a of the motor rotation shaft and a slit 14b that is located between the first and second optical axis orthogonal surfaces S1 and S2 and communicates with the projecting hole 14a. A pair of zooming motors 21 are disposed on the motor fixing wall 14 in a direction orthogonal to the first and second optical axis orthogonal surfaces S1 and S2 and in front of and behind the projection hole 14a in the optical axis direction. The fixing screw insertion hole 14c is formed. The zooming motor 21 is fixed to the motor fixing wall 14 by a fixing screw 14d inserted through the fixing screw insertion hole 14c.

  As shown in FIGS. 2 and 7, the zooming motor 21 has a PI light-shielding blade 21c and a worm 21d fixed to the motor rotating shaft 21a in this order from the motor body 21b side. The PI light shielding blade 21c has a single or a plurality of light shielding bodies at equal intervals around the motor rotation shaft 21a, and the pair of PI sensors 23 can detect the rotation direction and the rotation angle of the motor rotation shaft 21a. . The PI light-shielding blade 21c in the illustrated embodiment has three light-shielding bodies spaced at 120 ° intervals, and the pair of PI sensors 23 are arranged at 90 ° intervals with respect to the center of the motor rotating shaft 21a. The arrangement of the pair of PI sensors 23 is not limited to an interval of 90 ° as long as signals output from the pair of PI sensors 23 during operation do not synchronize with each other. Such a zooming position detecting mechanism using PI is well known. The motor rotation shaft 21a is disposed in a plane orthogonal to the optical axis O (a plane parallel to the first and second optical axis orthogonal planes S1 and S2), and the extending direction is centered on the optical axis O. It faces the tangential direction of the arc.

  A PI light shielding blade insertion opening 17 and a worm insertion opening 18 are formed in the driving unit support unit 12 so as to be positioned on the opposite side of the motor main body 21 b of the motor fixing wall 14. The PI light shielding blade insertion opening 17 and the worm insertion opening 18 are opened in the first optical axis parallel surface S3 and are aligned with the protruding hole 14a. The motor rotating shaft 21a of the zooming motor 21 can be inserted into the protruding hole 14a from the slit 14b of the motor fixing wall 14, and at the same time, the PI light shielding blade 21c is inserted into the PI light shielding blade insertion opening 17 and the worm 21d. Is inserted into the worm insertion opening 18. Thus, the motor body 21b of the zooming motor 21 is fixed in a state where the motor rotating shaft 21a is inserted into the protruding hole 14a, the PI light shielding blade 21c is inserted into the PI light shielding blade insertion opening 17, and the worm 21d is inserted into the worm insertion opening 18. The fixing screw 14 d inserted through the screw insertion hole 14 c is screwed into the female screw hole of the zooming motor 21 and fixed to the motor fixing wall 14.

  The gear train support wall 15 of the drive unit support 12 supports an optical axis orthogonal plane portion 15 a orthogonal to the optical axis O to rotatably support one end portion of each rotary shaft that is parallel to the optical axis O of the gear train 22. (FIGS. 2 and 5). That is, the gear train 22 is composed of a plurality of gear trains that mesh with each other, and the final gear is a gear (not shown external gear or internal gear) formed on the drive ring 13 that is rotatably supported in the cylindrical portion 11. Tooth gear). On the other hand, the gear on the inlet side of the gear train 22 has a helical gear 22a that meshes with the worm 21d of the zooming motor 21, as shown in FIG. The helical gear 22a meshes with the worm 21d inserted from the worm insertion opening 18 when the motor body 21b of the zooming motor 21 is inserted into the protruding hole 14a from the slit 14b of the motor fixing wall 14 as described above. . The worm 21d approaches and meshes with the helical gear 22a from a direction orthogonal to the rotation axis of the helical gear 22a.

  The inclination of the zooming motor 21 generated during assembly is caused by the deformation of the motor fixing wall 14 caused by the assembling order of the fixing screws 14d (two places) for fixing the zooming motor 21 to the motor fixing wall 14 and uneven tightening torque. It is assumed that In the present embodiment, the fixing screw insertion hole 14c and the fixing screw 14d are separated in a direction parallel to the rotation axis of the gear train 22 with the protruding hole 14a interposed therebetween, and are directed in a direction parallel to the motor rotation shaft 21a ( 3), the zooming motor 21 is deformed so that the inclination of the zooming motor 21 occurs in a direction parallel to the rotation axis of the gear train 22. Therefore, even if the zooming motor 21 is tilted, the tilt is generated in a direction parallel to the rotation axis of the gear train 22, and therefore there is little possibility of occurrence of a meshing abnormality between the worm 21d and the helical gear 22a. This advantage can be easily understood when compared with the case where the inclination of the zooming motor 21 occurs in a direction perpendicular to the rotation axis of the gear train 22. The inclination of the gear train 22 in the direction orthogonal to the rotation axis acts in a direction in which the worm 21d and the helical gear 22a are separated or approached, and is likely to cause a meshing abnormality.

  Each of the pair of PI sensor support portions 16 of the drive portion support portion 12 supports the PI sensor 23 constituting the PI together with the PI light shielding blade 21 c of the zooming motor 21. The PI sensor 23 has a U-shaped cross section straddling the PI light-shielding blade 21c of the zooming motor 21, and has a rectangular shape (frontal rectangle) when viewed from the axial direction of the motor body 21b. It is fixed. The PI sensor support portion 16 has orthogonal support surfaces 16a and 16b that are in contact with each other in the axial direction of the PI light-shielding blade 21c on two surfaces forming a right angle of the front rectangular PI sensor 23 (FIG. 3). . The pair of PI sensor support portions 16 pass through the center of the motor rotation shaft 21a and the center of the slit 14b, and are symmetrical with respect to the symmetry plane S12 positioned in parallel between the first and second optical axis orthogonal surfaces S1 and S2 ( A pair of PI sensors 23 are arranged at intervals of 90 ° with respect to the center of the motor rotating shaft 21a (FIGS. 3 and 8A). .

  The pair of PI sensors 23 can be arranged on one side (upper side) of the symmetry plane S12 so as to be symmetric with respect to a plane that passes through the center of the motor rotation shaft 21a and is orthogonal to the symmetry plane S12. One of the pair of PI sensors 23 is pressed and fixed by the gear cover 31 and the other by the PI presser 32. Since the gear lid 31 is a bearing of the gear train 22, if the gear lid 31 also has a role of a PI presser, the accuracy as a bearing is lowered. The gear lid 31 is a component that regulates the clearance of the gear train 22 in the direction of the rotation axis. If the clearance is too small, it becomes difficult to rotate, and if it is too large, it causes noise, so a considerable degree of accuracy is required. On the other hand, the PI presser 32 is designed in consideration of the dimensional variation in order to allow for the dimensional tolerance of the PI sensor 23, the thickness tolerance of the FPC board 24, and the clearance between the PI sensor 23 and the FPC board 24 generated when soldering. Is required. Thus, the arrangement in which the gear lid 31 also serves as a PI presser is disadvantageous in terms of accuracy, tolerance, and design freedom.

  If one pair of PI sensors 23 is arranged so that one of them intersects the plane of symmetry S12 (FIG. 8B), the arrangement space of one PI sensor 23 is slit 14b (motor rotating shaft 21a, PI light shielding blade 21c). And the opening for inserting the worm 21d), it is difficult to secure a portion where the driving unit support 12 is provided with a PI sensor support for supporting one PI sensor 23. Further, the arrangement of FIG. 8B is disadvantageous in miniaturization because the projected area (a square region surrounded by a two-dot chain line) is larger than the arrangement of the embodiment shown in FIG.

  The drive unit support unit 12 supports (contacts) one end portion of the rotation shaft of the gear train 22 on the gear train support wall 15, and a PI sensor fixed to the FPC board 24 on the PI sensor support unit 16. In the state in which 23 is supported (contacted), the living hinge cover member 30 having a single shape shown in FIG. 6 is fixed, and the gear train 22 and the PI sensor 23 are supported by the drive unit support unit 12. The living hinge cover member 30 is made of a molded product of a synthetic resin material, and a gear cover 31 and a PI presser 32 are connected to each other via a flexible hinge 33. The gear lid 31 functions as a bearing that supports the gear train 22 (supports the other end portion of the rotating shaft of the gear train 22) between the drive train support portion 12 and the gear train support wall 15 of the drive support portion 12. The presser 32 presses and fixes the PI sensor 23 (FPC board 24) against the PI sensor support 16 of the drive unit support 12. The living hinge lid member 30 changes the posture of the gear lid 31 and the PI presser 32 between the planar state shown in FIGS. 6A and 6B and the bent state shown in FIGS. It has the flexibility (toughness) that it can.

  6 (A) and 6 (B) show the completed state of the living hinge lid member 30 from the front and back sides. FIGS. 6 (C) and 6 (D) show the living hinge lid member 30 as the drive unit support 12. In this case, the gear lid 31 and the PI presser 32 are bent at right angles via the flexible hinge 33 to be attached to the front and rear sides. The shapes of the gear lid 31, the PI presser 32, and the flexible hinge 33 are determined so that the molding shown in FIGS. 6A and 6B can be performed with the upper and lower molding dies. The gear lid 31 and the PI presser 32 have flat portions 31a and 32a on their outer surfaces, and a circular recess 31b that supports the other end of the rotation shaft of each gear of the gear train 22 is formed on the inner surface of the gear lid 31. Has been. Further, the gear lid 31 protrudes from the insertion hole 31 c of the fixing screw 34 screwed into the female screw hole 12 a of the drive unit support 12, the counterbore recess 31 d of the insertion hole 31 c, and the drive unit support 12. A dowel hole 31e that fits into the dowel 12c (FIGS. 3 and 4), and a locking recess 31g that engages with a locking projection 12d (FIG. 2 (A)) that protrudes from the drive support portion 12. A locking rib 31f having the above is formed.

  The PI presser 32 has, on its inner surface, a support slope 32b that sandwiches the pair of PI sensors 23 from above the FPC board 24 to the pair of PI sensor support parts 16 of the drive part support part 12, and this support slope. The protrusion 32c which raises a support surface pressure partially is formed in 32b. The PI presser 32 is formed with a pair of engagement ribs 32d protruding outside (up and down) the pair of support slopes 32b. The engagement ribs 32d have a pair of engagement portions of the drive unit support portion 12. A locking recess 32e that engages with the locking protrusion 12b is formed.

  The above living hinge lid member 30 supports the gear lid 31 of the gear train 22 in a state where one end portion of the rotating shaft of the gear train 22 is supported (contacted) on the gear train support wall 15 of the drive support 12. The other end of the rotating shaft is covered and the other end is supported by the circular recess 31b. At that time, the dowel hole 31e of the gear lid 31 is fitted into the dowel 12c of the drive unit support portion 12, and the locking recess 31g of the locking rib 31f is fitted into the locking projection 12d. Further, in the state where the PI sensor 23 fixed to the FPC board 24 is supported (abutted) on the pair of PI sensor support portions 16 of the drive portion support portion 12, the support inclined surface 32 b of the PI presser 32 is set to the drive portion support portion. 12 and the locking recess 32e of the locking rib 32d is fitted into the locking protrusion 12b. The fixing screw 34 inserted through the insertion hole 31c is screwed into the female screw hole 12a of the drive unit support 12 to finish fixing the living hinge lid member 30 to the drive unit support 12. The living hinge lid member 30 is fixed to the drive unit support 12 and the gear lid 31 and the plane portions 31a and 32a on the outer surface of the PI presser 32 are orthogonal to each other (the plane portion 31a is perpendicular to the first optical axis orthogonal plane S1). The plane portion 32a is parallel to the first optical axis parallel plane S3).

  The gear train 22 is a power transmission system that transmits the power of the zooming motor 21 to the drive ring 13. In particular, an axial force is applied to the helical gear 22a on the input side by meshing with the worm 21d. In the present embodiment, the gear lid 31 of the living hinge lid member 30 is firmly fixed to the drive unit support 12 with the fixing screw 34 in addition to the engagement of the locking recess 31g and the locking projection 12d, thereby this axial direction. Can compete with power. On the other hand, no rotational force acts on the PI sensor 23 (the PI sensor 23 and the PI light-shielding blade 21c are not in contact with each other), and the PI sensor 23 is sufficiently engaged by the engagement of the locking recess 32e and the locking protrusion 12b. Can be supported by the drive unit support unit 12.

  The flexible hinge 33 of the living hinge lid member 30 may be cut after the living hinge lid member 30 is coupled to the drive unit support 12.

  In the present embodiment, the gear train 22 that is rotationally driven by the zooming motor 21 and the pair of PI sensors 23 for detecting the rotation direction and the rotation angle of the motor rotation shaft 21a of the zooming motor 21 are provided as a drive unit support unit. In the lens barrel driving unit structure fixed to 12, a gear lid 31 that supports the gear train 22 and a PI presser 32 that supports the pair of PI sensors 23 are connected by a flexible hinge 33. Since the living hinge cover member 30 is used, the number of parts can be reduced and the assembly cost can be reduced.

DESCRIPTION OF SYMBOLS 10 Lens barrel housing 11 Cylindrical part 12 Drive part support part (housing)
12a Female screw hole 12b Locking protrusion 12c Boss 12d Locking protrusion 13 Drive ring 14 Motor fixing wall 14a Projecting hole 14b Slit 14c Fixing screw insertion hole 15 Gear train support wall 15a Optical axis orthogonal plane part 16 PI sensor support part 16a 16b Orthogonal support Surface 17 PI shading blade insertion opening 18 Warm insertion opening 21 Zooming motor (motor)
21a Motor rotating shaft (motor rotating shaft)
21b Motor body 21c PI shading blade 21d Worm 22 Gear train 22a Helical gear 23 PI sensor 24 FPC board 30 Living hinge cover member (molded product)
31 Gear cover 31a Flat portion 31b Circular recess 31c Insertion hole 31d Recess 31e Boss hole 31f Locking rib 31g Locking recess 32 PI presser 32a Flat surface 32b Support slope 32c Projection 32d Locking rib 32e Locking recess 33 Flexible hinge 34 Fixing screw O Optical axis S1 First optical axis orthogonal surface S2 Second optical axis orthogonal surface S3 First optical axis parallel surface S4 Second optical axis parallel surface S12 Symmetric surface

Claims (9)

A lens that supports a motor and a gear train that rotationally drives the drive ring, and a pair of PI sensors for detecting the rotation direction and angle of the rotation shaft of the motor, in a housing that rotatably supports the drive ring In the lens barrel drive unit structure,
The gear train includes a gear having a rotation axis parallel to the optical axis, one end of the rotation shaft of the gear is supported by the housing, and the other end is supported by a gear lid fixed to the housing;
A worm that meshes with an input helical gear in the gear train and a PI light-shielding blade are fixed to the motor rotation shaft.
The housing has a projecting hole for the motor rotating shaft and is orthogonal to the motor rotating shaft, and a motor fixing wall for fixing the motor main body, and a worm insertion located on the opposite side of the motor fixing wall from the motor main body Having an opening and a PI shading blade insertion opening,
When the motor worm and the PI light shielding blade are inserted into the motor fixing wall from the worm insertion opening and the PI light shielding blade insertion opening, the motor rotation shaft is inserted from a direction perpendicular to the direction parallel to the rotation axis of the gear train. A slit communicating with the protruding hole of the motor rotation shaft is formed;
The housing is formed with a support portion for the pair of PI sensors that sandwich the PI light-shielding blade inserted from the PI light-shielding blade insertion opening.
Having a PI presser that sandwiches the PI sensor supported by the pair of PI sensor support portions between the housing and the gear lid and the PI presser are made of an integrally molded product of a resin material and are connected via a flexible hinge; The living hinge lid members connected to each other.
A lens barrel drive structure characterized by the above. 2. The lens barrel driving part structure according to claim 1, wherein each of the gear cover and the PI presser of the living hinge cover member has a flat part on its outer surface, and the two flat parts are substantially perpendicular to each other in a fixed state with respect to the housing. The structure of the lens barrel drive section. 3. The lens barrel drive unit structure according to claim 1, wherein the gear cover of the living hinge cover member is fixed to the housing by a fixing screw. 4. The lens barrel drive part structure according to claim 1, wherein the PI presser of the living hinge cover member is a locking recess formed on one side and the other side of the PI presser and the housing. And a lens barrel drive unit structure fixed by a locking projection. 5. The lens barrel drive unit structure according to claim 1, wherein the motor fixing wall of the housing has a pair of fixing screw insertion holes for fixing the motor main body, and the protrusion of the motor rotating shaft. A lens barrel drive unit structure in which holes are formed side by side in a direction parallel to the rotation axis of the helical gear of the gear train. 6. The lens barrel drive unit structure according to claim 1, wherein the pair of PI sensors are arranged symmetrically with respect to a plane passing through the motor rotation axis and the slit center. Construction. 7. The lens barrel drive unit structure according to claim 1, wherein the worm insertion opening and the PI light shielding blade insertion opening are opened in a plane parallel to the optical axis of the housing. Construction. 8. The lens barrel drive unit structure according to claim 1, wherein the housing includes a gear train support wall having an optical axis orthogonal plane portion that supports one end of the shaft of the gear train, and the gear. An optical axis having a motor fixing wall for fixing the motor main body orthogonal to the column support wall and the motor rotation axis, and a worm insertion opening and a PI light shielding blade insertion opening located on the opposite side of the motor fixing wall from the motor main body. Drive structure of a lens barrel having a parallel surface. 9. The lens barrel drive unit structure according to claim 8, wherein the housing is located on both sides of the slit on the opposite side of the motor fixing wall from the motor body and supports a pair of PI sensors sandwiching the PI light shielding blades. The lens barrel drive section structure in which the section is formed.

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