JP2005241843A - Method for assembling lens frame and lens frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for assembling a lens frame whose occupying space is small and which can be miniaturized as a lens frame having a diaphragm. <P>SOLUTION: In the lens frame, a sheet type diaphragm plate 51 is attached and fixed on the rear end face of a 2nd group frame 10 holding a 2nd group lens 42. The plate 51 is attached and fixed by a diaphragm plate attaching tool 81 having frame positioning shafts 82 and 83 and diaphragm plate positioning pins 84 and 85. The plate 51 to which a double coated adhesive tape 53 is stuck is inserted through the pins 84 and 85, and positioned by adjusting the center of a central aperture part 51a to a point PO corresponding to an optical axis O. Then, the frame 10 is inserted through the shafts 82 and 83 so as to be positioned at the point PO and made to abut on the plate 51, whereby the plate 51 is attached and fixed on the rear end face 10d of the frame 10 without causing the positional deviation of the aperture part 51a being the diaphragm aperture of the plate 51 in a state where it has no part projecting to the rear face of the frame 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for assembling a lens barrel having a lens holding frame to which a diaphragm (aperture plate) is fixed, and the lens barrel.

  In a conventional lens barrel, a plate-shaped stop (aperture plate) having an opening for cutting unnecessary light is disposed between predetermined lens holding frames for holding each lens group. This diaphragm is fixed to the lens holding frame on either side, but the positional accuracy of the diaphragm plate with respect to the lens optical axis affects the drop in the amount of light in the surrounding area and coma aberration. There is. In order to arrange the aperture plate with high accuracy, for example, two positioning pins are provided on the lens holding frame, and the aperture plate is positioned with the positioning pins to maintain a predetermined accuracy with respect to the lens optical axis. Install it.

  In recent years, there has been a demand for further miniaturization of digital cameras and silver halide cameras, and in response to this, a plurality of lens holding frames for holding each lens group are arranged at extremely close positions in a lens barrel incorporated in the camera. The structure has to be adopted.

  However, in the case where the diaphragm plate is positioned by the positioning pin provided on the lens holding frame as in the conventional lens barrel described above, the positioning pin is projected outward (backward of the optical axis). The other lens holding frame arranged at the rear position cannot be approached any further because the positioning pin is interposed, and the space occupied by the lens barrel in the optical axis direction is required to be as small as possible. I couldn't respond enough.

  The present invention has been made to solve the above-described problem, and provides a method of assembling a lens barrel that has a small space and that can be miniaturized in a lens barrel having a diaphragm. An object is to provide the lens barrel.

  A lens barrel assembling method according to claim 1 of the present invention is the lens barrel assembling method for manufacturing a lens barrel having a diaphragm, wherein the lens holding frame holding the lens and the lens holding frame are arranged in a first manner. A jig for holding the diaphragm at a predetermined position and mounting the diaphragm at a second predetermined position. The jig is positioned and fixed to the lens holding frame by the jig.

  The lens barrel assembly method according to claim 2 of the present invention is the lens barrel assembly method according to claim 1, wherein the lens holding frame is movable in the lens barrel. And a guide fitting hole that fits into a guide shaft provided in the jig, and the guide fitting hole is fitted into a shaft portion provided in the jig to be held at the first predetermined position.

  The lens barrel assembly method according to claim 3 of the present invention is the lens barrel assembly method according to claim 1, wherein the diaphragm is held by the lens holding frame at the second predetermined position. A hole provided in the aperture is fitted into a shaft provided in the jig and held at the second predetermined position.

  The lens barrel according to claim 4 of the present invention is a lens barrel having a diaphragm, and includes the diaphragm and a lens holding frame that holds the lens, and the lens holding frame is mounted on a jig. The diaphragm is held at a first predetermined position, the diaphragm is held at a second predetermined position on the jig, and the diaphragm is positioned and fixed to the lens holding frame by the jig.

  According to the present invention, it is possible to provide a method for assembling a lens barrel that has a small space and can be miniaturized in a lens barrel having an aperture stop, and it is possible to provide the lens barrel.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing the appearance of a lens barrel according to an embodiment of the present invention. 2, 3 and 4 are cross-sectional views along the optical axis of the lens barrel. FIG. 2 shows a retracted state, FIG. 3 shows a wide state, and FIG. 4 shows a tele state. Show. FIG. 5 is a perspective view of the second group frame, the shutter frame, the third group frame, the fourth group frame, the rear fixed frame, and the like built in the lens barrel when viewed from the front lower side. FIG. 6 is a perspective view of the second group frame, the shutter frame, the third group frame, the fourth group frame, the fifth group frame, and the rear fixed frame built in the lens barrel when viewed from the front upper side. FIG. 7 is a perspective view of the shutter frame, the third group frame, and the fourth group frame built in the lens barrel when viewed from the rear upper side. FIG. 8 is a view taken in the direction of arrow A in FIG. 2 and is a view of the lens group frame around the third group frame as viewed from the front side. FIG. 9 is a view taken in the direction of arrow B in FIG. It is the figure which looked around the 4th group lens frame of the above-mentioned lens barrel from the front side. FIG. 10 is an enlarged cross-sectional view along the optical axis showing the second group frame, the aperture plate, and the shutter frame around the lens barrel. FIG. 11 is a view taken in the direction of arrow C in FIG. 10 and shows a state in which a diaphragm plate is attached to the second group lens frame. 12 is a view of the diaphragm plate as viewed in the direction of arrow C in FIG. FIG. 13 is a view of the second group lens frame before attaching the diaphragm plate, as viewed in the direction of arrow C in FIG. FIG. 14 is a perspective view showing a state in which a diaphragm plate is positioned and stuck to the second group frame using a diaphragm plate bonding jig.

  In the following description, the optical axis (photographing optical axis) of the photographing lens is indicated by the optical axis O. The subject side along the optical axis O is the front (+ Z direction), and the imaging side is the rear (−Z direction). The left-right direction is the direction seen from the front.

  A lens barrel 1 according to an embodiment of the present invention is a zoom lens barrel for a digital camera, and as shown in FIG. 1, a plurality of forward and backward movable lenses holding first to fifth group lenses 41 to 45 are provided. An imaging unit having a lens holding frame and a CCD 47, a zoom motor 71 for driving the lens holding frame back and forth, a gear box 72 incorporating a drive gear train, and the like are included.

  Specifically, the lens barrel 1 includes a first fixed frame 2 that is integrally coupled as shown in FIGS. 2 to 4, a second fixed frame 3 that is another frame member, a front fixed plate 5, a rear fixed plate 16, and As the plurality of frame members that are driven forward and backward during zooming, the first group frame 6 that holds the first group lens 41, the second group lens 42 that holds the first group lens 41, and the second group frame 10 and the third group lens to which the diaphragm plate is fixed. 43 and the third group frame 12 as a moving frame member for holding the shutter frame 13, and the fourth group frame 14 as a moving frame member for holding the fourth group lens 44. The fifth group lens 45 is driven forward and backward during focusing. The fifth group frame 15 to be held, the optical filter 46, the CCD 47, and the CCD support plate 48 fixed to the rear fixed plate 16 as an imaging unit, and the zoom motor 71 and the gear box 72 described above are included.

  The first fixed frame 2 is an annular frame member, and is provided with three rectilinear grooves 2a along the optical axis O direction on the inner peripheral surface portion. Further, the second fixed frame 3 is fixedly supported by screws at the rear end portion thereof in a state where a predetermined space is provided on the inner peripheral portion of the first fixed frame 2. Further, the front fixing plate 5 is fixedly supported by screws 62 on the front end surface of the second fixing frame 3, and the rear fixing plate 16 is fixed to the rear end surface of the second fixing frame 3. A zoom motor 71 and a gear box 72 containing a gear train for connecting the zoom motor 71 and the cam frame 4 are disposed outside the first fixed frame 2.

  The front fixing plate 5 is a disk-shaped member having a central opening. In the front fixing plate 5, bottomed shaft support holes 5a and 5b are disposed at the lower left and upper right positions that are substantially opposed to each other with the optical axis O in between. The rear fixed plate 16 is fixedly provided with an optical filter 46 at the center opening and a CCD 47 supported by a CCD support plate 48 at a rear position thereof. Further, the bottom fixing shaft support holes 16a and 16b are disposed in the rear fixing plate 16 at the lower left and upper right positions that are substantially opposed to each other with the optical axis O interposed therebetween.

  In the shaft support holes 5a, 5b and 16a, 16b of the front and rear fixing plates 5, 16, two guide shafts 21 and 22, which are guide shafts, are fitted and parallel to the optical axis O. Fixedly supported.

  The cam frame 4 is an annular frame member, is fitted to the outer periphery of the second fixed frame 3, is restricted from moving in the optical axis O direction, and is supported in a rotatable state. A gear portion 4a is provided on the outer peripheral portion of the rear end of the cam frame 4, three cam grooves 4b having the same shape that are inclined with respect to the optical axis O are provided on the outer peripheral portion of the ring, Two cam grooves 4c that are inclined with respect to the optical axis O and one cam groove 4d and 4e are provided in the portion. The cam grooves 4b, 4c, 4d, and 4e are cam grooves having inclined surfaces that match the conical surfaces of the inserted cam followers 31, 33A, 33B, 34, and 35.

  The gear portion 4a of the cam frame 4 meshes with the output gear end of the gear train. Accordingly, the cam frame 4 is rotationally driven by the zoom motor 71 via the gear train during setup from the retracted state, or during set-down or zoom drive.

  The first group frame 6 is an annular frame member, and is supported by being fitted between the inner periphery of the first fixed frame 2 and the outer periphery of the cam frame 4 so as to be able to rotate and advance and retract. A first group lens holding frame 7 that holds the first group lens 41 is fixed to the front end surface portion of the first group frame 6 with screws 61. Further, a filter ring 8 is screwed and attached to the front side of the first group lens holding frame 7.

  Three rectilinear guide pins 32 are fixed to the outer peripheral rear portion of the first group frame 6, and three cam followers 31 having a conical surface are fixed to the inner peripheral rear portion. The rectilinear guide pin 32 is slidably fitted into the rectilinear groove 2 a of the first fixed frame 2, and the cam follower 31 is slidably fitted into the cam groove 4 b of the cam frame 4. Therefore, when the cam frame 4 is rotationally driven during the retracting drive and further during the zooming, the first group frame 6 is driven forward and backward along the cam groove 4b of the cam frame 4 while being guided linearly in the direction of the optical axis O. (FIGS. 2 to 4).

  The second group frame 10 is a frame member having a flange portion 10 a at the rear, and is incorporated into the second fixed frame 3. The second group lens 42 is held in the central opening of the second group frame 10. The lens holder 11 is fixed to the front outer periphery of the second group lens 42. A sleeve hole 10b and a U-shaped groove 10c are provided at two locations substantially opposite to each other across the optical axis O on the rear outer periphery of the flange portion 10a.

  The sleeve 25 is inserted into the sleeve hole 10b with a backlash, and is bonded and fixed in a positioned state. That is, the guide shaft 21 is fitted into the sleeve 25, and the guide shaft 21 is adjusted to a predetermined positional accuracy and held with respect to the optical axis O of the second group frame 10 (second group lens 42). Thus, the sleeve hole 10b and the sleeve 25 are bonded and fixed. When the lens mirror frame is attached, the guide shaft 21 is slidably inserted into the shaft hole 25a that is the guide fitting hole of the sleeve 25, and the guide shaft 22 is slidable into the U-shaped groove 10c. Insert.

  A portion of the rear end face 10d of the flange portion 10a of the second group frame 10 that faces the shutter frame 13 in the direction of the optical axis O is a sheet-shaped stop for cutting unnecessary light as shown in FIGS. The diaphragm plate 51 is positioned and fixed in a direction orthogonal to the optical axis O. The adhering operation is performed using a diaphragm plate bonding jig 81 (FIG. 14) described later.

  The diaphragm plate 51 is provided with a central opening 51a, which is a diaphragm opening, and convex notch 51b, 51c for the second group frame on the outer periphery, and two positioning holes 51d, 51d on the outer side of the central opening 51a. 51e is provided (FIGS. 12 and 14). On the other hand, the diaphragm plate bonding jig 81 is provided with frame positioning shafts 82 and 83 which are shaft portions at positions corresponding to the guide shafts 21 and 22 with respect to the optical axis corresponding point P 0. Aperture plate positioning pins 84 and 85, which are shaft portions for positioning the center of the opening 51a at the optical axis corresponding point P0, are fixed (FIG. 14).

  When the diaphragm plate 51 is bonded and fixed to the second group frame 10, as shown in FIG. 14, the positioning holes 51d and 51e of the diaphragm plate 51 having the double-sided adhesive tape 53 affixed to the upper surface thereof are used as the positioning pins 84 of the diaphragm plate bonding jig 81. , 85 and fitting. In this attached state, the diaphragm plate 51 is positioned at a second predetermined position where the center of the central opening 51a coincides with the optical axis corresponding point P0 of the diaphragm plate bonding jig 81. On the other hand, the second group frame 10 with the sleeve 25 already fixed in place is fitted to the sleeve 25 and the U-shaped groove 10c on the frame positioning shafts 82 and 83, respectively. By this fitting, the second group frame 10 is in the first predetermined position where the shaft hole 25a of the sleeve 25 and the U-shaped groove 10c are in a predetermined positional relationship with respect to the optical axis corresponding point P0 of the diaphragm plate bonding jig 81. And is brought into contact with the upper surface of the diaphragm plate 51. With the contact, the diaphragm plate 51 is fixed to the rear end face 10d side of the second group frame 10 with the center of the opening 51a of the diaphragm plate 51 coinciding with the optical axis of the second group frame 10.

  Metal cam followers 33A and 33B having conical surfaces adjacent to the sleeve 25 and the U-shaped groove 10c are fixed to the second group frame 10. The cam followers 33 </ b> A and 33 </ b> B are slidably fitted into the two inner peripheral cam grooves 4 c of the cam frame 4 through the insertion groove 3 b of the second fixed frame 3. When the cam frame 4 is rotationally driven during retracting driving or zooming, the second group frame 10 is guided by the guide shafts 21 and 22 and moves forward and backward in the optical axis O direction along the locus of the cam groove 4c. (FIGS. 2-4).

  The third group frame 12 is a frame member having a flange portion, and is incorporated into the second fixed frame 3. The shutter frame 13 is fixed to the front surface of the third group frame 12, and the third group lens 43 is held in the central opening.

  The flange portion of the third group frame 12 is provided with guide shaft support holes 12a and 12b at two positions on the left and right back sides substantially opposed to each other with the optical axis O interposed therebetween as shown in FIG. Sleeve holes 12c and U-shaped grooves 12d are provided at two locations, the lower left and upper right, which are substantially opposed to each other with the optical axis O in the vicinity of the support holes 12a and 12b.

  The guide shafts 23 and 24 are bonded and fixed to the guide shaft support holes 12a and 12b in a state of extending rearward in parallel with the optical axis O, respectively. The positions of the guide shafts 23 and 24 on the plane orthogonal to the optical axis are in the vicinity of the positions where the guide shafts 21 and 22 are disposed.

  The sleeve 26 is inserted into the sleeve hole 12c with a backlash, and is bonded and fixed in a state of being positioned with reference to the guide shaft 21. The positioning and adhesion method is the same as in the case of the sleeve 25. The guide shaft 21 is slidably fitted into the sleeve 26, and the guide shaft 22 is slidably fitted into the U-shaped groove 12d.

  A single metal cam follower 34 having a conical surface is fixed to the third group frame 12 adjacent to the guide shaft 21 fitted into the sleeve 26. The cam follower 34 is slidably fitted into the inner circumferential cam groove 4 d of the cam frame 4 through the insertion groove 3 b of the second fixed frame 3. When the cam frame 4 is rotationally driven at the time of retracting driving or zooming, the third group frame 12 moves forward and backward in the optical axis O direction along the locus of the cam groove 4d while being guided by the guide shafts 21 and 22 ( 2-4).

  A convex portion 12e that slightly protrudes outward is provided in the vicinity of the U-shaped groove 12d on the outer peripheral portion of the flange portion of the third group frame 12 and at a position substantially opposed to the cam follower 34 across the optical axis O. (FIGS. 6 and 8). When the lens barrel 1 is in a normal use state (advancing and retracting driving state), the convex portion 12e does not contact the inner peripheral surface 3a of the second fixed frame 3 and advances and retracts while maintaining a predetermined gap S1. Moving.

  An external force such as an impact force acts on the lens barrel, and if each part of the lens barrel is deformed, the convex portion 12e comes into contact with the inner peripheral surface 3a of the second fixed frame 3. This contact prevents the cam follower 34 from coming out of the cam groove 4d.

  The shutter frame 13 incorporates a shutter blade 52 capable of opening and closing the central opening, a diaphragm blade (not shown) capable of adjusting the diaphragm, a shutter blade, a solenoid for driving the diaphragm blade (not shown), and the like. . The shutter frame 13 is fixedly supported on the front side of the third group frame 12 and moves forward and backward together with the third group frame 12.

  The fourth group frame 14 is incorporated in the second fixed frame 3 and holds the fourth group lens 44 in the central opening. A sleeve hole 14a and a U-shaped groove 14b are provided on the left and right sides of the fourth group frame 14 with the optical axis O in between (FIG. 9).

  A sleeve 27 is inserted in the sleeve hole 14a with a backlash, and is fixedly bonded with the guide shaft 23 positioned as a reference. The positioning and adhesion method is the same as that for the sleeve 25. A guide shaft 23 fixed to the third group frame 12 is slidably fitted in the sleeve 27, and a guide shaft 24 fixed to the third group frame 12 is slidable in the U-shaped groove 14b. Fit into.

  A single metal cam follower 35 having a conical surface is fixed to the fourth group frame 14 adjacent to the guide shaft 23 fitted into the sleeve 27 (as a result, the cam follower 35 is also adjacent to the guide shaft 21. Figure 9). The cam follower 35 is slidably fitted into the inner circumferential cam groove 4 e of the cam frame 4 through the insertion groove 3 b of the second fixed frame 3. When the cam frame 4 is rotationally driven at the time of retracting driving or zooming, the fourth group frame 14 is guided by the guide shafts 23 and 24 on the third group frame 12 side guided by the guide shafts 21 and 22. It moves forward and backward in the direction of the optical axis O along the locus of the cam groove 4e (FIGS. 2 to 4). A compression spring 30 having an end fixed by a retaining ring is inserted behind the guide shaft 23, and the fourth group frame 14 and the third group frame 12 are urged toward each other. . Accordingly, the looseness on the cam grooves 4d and 4e of the cam frame 4 between the cam follower 35 of the fourth group frame 14 and the cam follower 34 of the third group frame 12 described later is removed, and the third and fourth group frames 12 are removed. , 14 are always driven forward / backward with no play in the direction of the optical axis O.

  A convex portion 14e slightly protruding outward in the lens barrel radial direction is located in the vicinity of the U-shaped groove 14b on the outer peripheral portion of the flange portion of the fourth group frame 14 and substantially opposed to the cam follower 35 across the optical axis O. Provided (FIGS. 6 and 8). Further, a built-up portion 14d is provided at the bottom of the U-shaped groove 14b. On the other hand, in the vicinity of the sleeve 27 and the cam follower 35 on the outer peripheral portion of the flange portion of the fourth group frame 14, a convex portion 14c protruding outward in the lens barrel radial direction is provided. When the lens barrel 1 is in a normal use state (advancing / retreating driving state), the convex portions 14e and 14c do not contact the inner peripheral surface 3a of the second fixed frame 3 and have predetermined gaps S2 and S4, respectively. Is maintained. The built-up portion 14d maintains a predetermined gap S3 without contacting the guide shaft 24. Further, the position of the convex portion 14c in the optical axis O direction is arranged to be shifted by a predetermined distance on the rear side with respect to the cam follower 35 (note that the convex portion 14c is a convex portion having a predetermined thickness in the optical axis direction. May be).

  When an external force such as impact force acts on the lens barrel 1 and each part of the lens barrel is deformed, the convex portions 14e and 14c are formed on the inner peripheral surface 3a of the second fixed frame 3 and the built-up portion 14d. Comes into contact with the guide shaft 24 to prevent the cam follower 35 from coming out of the cam groove 4e.

  The fifth group frame 15 is incorporated in the second fixed frame 3 and holds the fifth group lens 45 in the central opening. A U-shaped groove 15a and a sleeve hole 15b are provided at the lower left and upper right positions of the fifth group frame 15 across the optical axis O (FIG. 9).

  The sleeve 28 is inserted into the sleeve hole 15b with a backlash, and is bonded and fixed in a state of being positioned with respect to the guide shaft 22. The positioning and adhesion method is the same as in the case of the sleeve 25. A guide shaft 22 supported by the front and rear fixing plates 5 and 16 is slidably fitted into the sleeve 28, and a guide shaft 21 supported by the front and rear fixing plates 5 and 16 is inserted into the U-shaped groove 15a. Is slidably inserted.

  The fifth group frame 15 is driven by focusing via a focus drive mechanism (not shown), and is guided by the guide shafts 21 and 22 to move forward and backward in the optical axis O direction.

  In the lens barrel 1 of the present embodiment having the above-described configuration, when the zoom motor 71 is driven and the cam frame 4 is rotationally driven in the setup direction in the retracted state shown in FIG. Each of the cam followers moves in the direction of the optical axis O, and the first group frame 6, the second group frame 10, the third group frame 12, and the fourth group frame 14 are extended to the wide positions, respectively, so that wide-angle shooting is possible. (FIG. 3). Therefore, the fifth group frame 15 is driven forward and backward by the focus drive mechanism, focusing is performed, and shooting in the wide state is performed. Further, when the zoom motor 71 is driven in the same direction, each of the frames is extended to the tele position, and photographing in the tele state is possible (FIG. 4). When the zoom motor 71 is driven in the reverse direction and the cam frame 4 is driven to rotate in the set-down direction, each of the frames is retracted to the retracted position shown in FIG.

  As described above, in the lens barrel 1, the diaphragm plate 51 and the second group frame 10 are positioned and bonded and fixed to each other using the diaphragm plate bonding jig 81 described above. Accordingly, the diaphragm plate 51 can be bonded and fixed with the rear end face 10d of the flange portion 10a of the second group frame 10 with very little center position deviation with respect to the optical axis O. Moreover, the rear surface of the diaphragm plate 51 is the rearmost end surface on the second group frame 10 side, and further positioning is performed from the diaphragm plate on the rear end surface of the frame member as in the conventional frame member in which the convex positioning pin for the diaphragm plate is provided on the frame member side. The pin does not protrude. As a result, the distance from the front end surface 13a of the rear shutter frame 13 can be made very close, the degree of freedom in optical design of the lens barrel can be increased, and the lens barrel can be downsized.

  A lens barrel according to the present invention or a method for assembling the lens barrel is a lens barrel having a diaphragm, which occupies less space and can be miniaturized, or the lens barrel is assembled. It can be used as a method.

FIG. 1 is a perspective view showing an appearance of a lens barrel according to an embodiment of the present invention. It is sectional drawing along the optical axis in the retracted state of the lens barrel of FIG. It is sectional drawing along the optical axis in the wide state of the lens barrel of FIG. It is sectional drawing along the optical axis in the tele state of the lens barrel of FIG. FIG. 2 is a perspective view of a second group frame, a shutter frame, a third group frame, a fourth group frame, a rear fixed frame, and the like built in the lens barrel of FIG. 1 as viewed from the front lower side. It is the perspective view which looked at the 2nd group frame, shutter frame, 3rd group frame, 4th group frame, 5th group frame, and rear fixed frame built in the lens barrel of FIG. 1 from the front upper side. It is the perspective view which looked at the shutter frame, the 3rd group frame, and the 4th group frame built in the lens barrel of FIG. 1 from back upper side. FIG. 3 is a view taken in the direction of arrow A in FIG. 2, and is a view of the lens group frame around the third group frame as viewed from the front side. It is a B arrow line view of FIG. It is the figure which looked around the 4th group lens frame of the above-mentioned lens barrel from the front side. FIG. 3 is an enlarged cross-sectional view along the optical axis showing the second group frame, the diaphragm plate, and the periphery of the shutter frame of the lens barrel of FIG. 1. FIG. 11 is a view as viewed in the direction of arrow C in FIG. 10 and shows a state in which a diaphragm plate is attached to the second group lens frame. It is a figure which shows the aperture_diaphragm | restriction plate shown by C arrow of FIG. It is a figure which shows the said 2nd group lens frame before the aperture_diaphragm | sticking plate shown by C arrow of FIG. It is a perspective view which shows the state which positions and sticks the aperture plate of FIG. 12 to the 2nd group frame of FIG. 13 using an aperture plate adhesion jig.

Explanation of symbols

10 ... Second group frame (lens holding frame)
21 ... Guide shaft (guide shaft)
25a ... Shaft hole of the sleeve (guide shaft fitting hole)
51. Diaphragm plate (diaphragm)
51d, 51e
... Positioning hole (hole)
81 ... Diaphragm bonding jig (jig)
82,83
... Frame positioning axis (shaft)
84,85
... Drawing plate positioning pin (shaft)

Agent Patent Attorney Susumu Ito

Claims (4)

In a lens barrel assembling method for manufacturing a lens barrel having a diaphragm,
A lens holding frame holding the lens;
A jig for holding the lens holding frame in a first predetermined position and holding the diaphragm in a second predetermined position;
A lens barrel assembly method comprising: fixing the stop to the lens holding frame on the jig.   The lens holding frame has a guide fitting hole that fits into a guide shaft provided in the lens lens frame so that the lens holding frame can move within the lens lens frame. 2. A lens barrel assembling method according to claim 1, wherein the lens barrel is fitted to a shaft portion provided on the lens body and held at the first predetermined position.   Since the diaphragm is held in the second predetermined position by the lens holding frame, a hole provided in the diaphragm is fitted into a shaft provided in the jig, and the second predetermined position is obtained. 2. The lens barrel assembly method according to claim 1, wherein the lens barrel is held in position. In a lens barrel with an aperture,
The aperture and
A lens holding frame holding the lens;
The lens holding frame is held at a first predetermined position on the jig, the diaphragm is held at a second predetermined position on the jig, and the lens is held on the jig. A lens barrel having the stop fixed to a holding frame.

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