JP2014032357A - Lens barrel, optical device and manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce distortion of a member.SOLUTION: A lens barrel comprises: a holding cylinder that has a shape including an opening part formed by eliminating a part of a circumferential direction of a cylinder; a fixture member that covers at least a part of the opening part and is fixed to the holding cylinder; a first positioning part in which one is provided on one side of a pair of areas facing each other across the opening part in the holding cylinder and the other is provided at a corresponding position in the fixture member, and the fixture member is positioned to the holding cylinder by mutual fitting of the one and the other; a second positioning part in which one is provided on the other side of the pair of areas in the holding cylinder and the other is provided at the corresponding position in the fixture member, a position of the one and the other is mutually restricted via a jig and the jig is pulled out to thereby clear a positioning restriction; and a setscrew that screws the fixture member to the holding cylinder on a side of the pair of areas where the first positioning part is provided in the holding cylinder.

Description

  The present invention relates to a lens barrel, an optical apparatus, and a manufacturing method.

There is a structure in which a motor frame is screwed to a lens barrel (see Patent Document 1).
[Patent Document 1] JP 09-325256 A

  In a small lens barrel, the motor frame attachment portion may not be formed in a frame shape. For this reason, the member including the attachment portion may be deformed by fastening of the attachment screw.

  In the first aspect of the present invention, a holding cylinder having a shape including an opening formed by removing a part of the cylinder in the circumferential direction, and a fixing member that covers at least a part of the opening and is fixed to the holding cylinder One side of the pair of regions facing each other across the opening in the holding cylinder, and the other side is provided at a corresponding position in the fixing member, and the fixing member is positioned with respect to the holding cylinder by fitting each other. A first positioning portion for determining the position of the holding cylinder, one of the pair of regions of the holding cylinder is provided on the other side, and the other is provided at a corresponding position on the fixing member. And a set screw for screwing the fixing member to the holding cylinder on the side where the first positioning part of the pair of regions in the holding cylinder is provided. Preparation The lens barrel is provided.

  In the second aspect of the present invention, an optical apparatus including the lens barrel is provided.

  In the third aspect of the present invention, one provided on one side of a pair of regions facing each other across the opening in the holding cylinder having a shape including an opening formed by removing a part of the cylinder in the circumferential direction And a first positioning step for determining the position of the fixing member with respect to the holding cylinder by fitting the other provided at a corresponding position in the fixing member covering at least a part of the opening, and a pair of the holding cylinder A second positioning step of restraining the position of the one provided on the other side of the region and the other provided at the corresponding position on the fixing member to each other via a jig, and the first of the pair of regions in the holding cylinder A lens having a screwing stage for screwing the fixing member to the holding cylinder and an opening stage for releasing the positioning constraint by removing the jig on the side where the positioning portion is provided. Method for producing a cylinder is provided.

  The above summary of the present invention does not enumerate all necessary features of the present invention. Sub-combinations of these feature groups can also be an invention.

1 is a schematic cross-sectional view of a single-lens reflex camera 100. FIG. 2 is a schematic cross-sectional view of a lens unit 200. FIG. It is a perspective view which shows the holding cylinder 280 independently. FIG. 11 is a perspective view showing a process of attaching a motor assembly 270. FIG. 11 is a perspective view showing a process of attaching a motor assembly 270. FIG. 6 is a partial plan view of a holding cylinder 280 to which a motor assembly 270 is attached. FIG. 6 is a partial plan view of a holding cylinder 280 to which a motor assembly 270 is attached. It is a perspective view of the holding cylinder 280 to which the motor assembly 270 is attached.

  Hereinafter, the present invention will be described through embodiments of the invention. The following embodiments do not limit the invention according to the claims. Not all combinations of features described in the following embodiments are essential for the solution of the invention.

  FIG. 1 is a schematic cross-sectional view of a single-lens reflex camera 100 that is an example of an optical apparatus. The single-lens reflex camera 100 includes a lens unit 200 and a camera body 300.

  For the purpose of simplifying the description, in the following description, the object side with respect to the lens unit 200 attached to the camera body 300 is described as the front side or the front side of the single-lens reflex camera 100. Further, the side far from the object with respect to the lens unit 200 is referred to as a rear side or a back side in the single-lens reflex camera 100.

  The lens unit 200 has an optical system including a first lens group 210, a second lens group 220, a third lens group 230, and a fourth lens group 240 arranged along the optical axis X. The first lens group 210, the second lens group 220, the third lens group 230, and the fourth lens group 240 are individually held by the lens holding frames 212, 222, 232, and 242, respectively.

  The illustrated lens unit 200 is in a retracted state in which the first lens group 210, the second lens group 220, the third lens group 230, and the fourth lens group 240 are close to each other. Thereby, the length of the lens unit 200 in the optical axis X direction is shortened, and the portability of the single-lens reflex camera 100 is improved. However, the lens unit 200 in the retracted state cannot be used as an optical device.

  The lens unit 200 includes a lens barrel including a fixed cylinder 201, a zoom ring 202, a rectilinear cylinder 203, a front cylinder 204, a cam cylinder 290, a guide cylinder 206, a front side moving frame 207 and a rear side moving frame 209. The fixed cylinder 201 has a lens side mount 208 at the rear end. The fixed cylinder 201 is coupled to the camera body 300 by coupling the lens side mount unit 208 to the body side mount unit 360 on the front surface of the camera body 300.

  The coupling between the lens side mount portion 208 and the body side mount portion 360 can be released. Therefore, the camera body 300 can be used in combination with another lens unit 200 having the lens side mount portion 208 that conforms to the standard.

  The zoom ring 202 is disposed on the outer peripheral surface of the fixed cylinder 201, and is rotated about the optical axis X of the optical system as a rotation axis by a user operation. The zoom ring 202 in the lens unit 200 is rotated by the user when the lens unit 200 is expanded to cancel the retracted state. The zoom ring 202 is also rotated by the user when the optical system of the lens unit 200 is scaled.

  In the lens unit 200, the lens holding frame 232 that holds the third lens group 230 is supported so as to be movable with respect to the front side moving frame 207. The lens holding frame 232 is driven by a motor assembly 270 fixed to the front side moving frame 207.

  The motor assembly 270 includes a stepping motor 272, a feed screw 274, and a fixing member 276. The fixing member 276 integrally supports the stepping motor 272 and the feed screw 274. A stepping motor 272 as an actuator rotates the feed screw 274. The feed screw 274 engages with the lens holding frame 232 via the rack member 278.

  As a result, the motor assembly 270 can move the third lens group 230 held by the lens holding frame 232. When the third lens group 230 moves, the focal position of the optical system of the lens unit 200 changes. Therefore, the lens unit 200 can be focused by electrically controlling the stepping motor 272 based on the signal from the camera body 300 side.

  The camera body 300 includes a mirror unit 370 disposed behind the body side mount portion 360. A focusing optical system 380 is disposed below the mirror unit 370. A focusing screen 352 is disposed above the mirror unit 370.

  A pentaprism 354 is disposed further above the focusing screen 352, and a finder optical system 356 is disposed behind the pentaprism 354. The rear end of the viewfinder optical system 356 is exposed as a viewfinder 350 on the back surface of the camera body 300.

  Behind the mirror unit 370, a shutter unit 310, a low-pass filter 332, an image sensor 330, a substrate 320, and a display unit 340 are sequentially arranged. A display unit 340 formed by a liquid crystal display panel or the like appears on the back surface of the camera body 300. A control unit 322, an image processing unit 324, and the like are mounted on the substrate 320.

  The mirror unit 370 includes a main mirror 371 and a sub mirror 374. The main mirror 371 is supported by a main mirror holding portion 372 that is pivotally supported by a main mirror rotating shaft 373.

  The sub mirror 374 is supported by a sub mirror holding portion 375 that is pivotally supported by a sub mirror rotating shaft 376. The sub mirror holding unit 375 rotates with respect to the main mirror holding unit 372. Therefore, when the main mirror holding part 372 rotates, the sub mirror holding part 375 is also displaced together with the main mirror holding part 372.

  When the front end of the main mirror holding portion 372 is lowered, the main mirror 371 is positioned obliquely on the incident light beam incident from the lens unit 200. When the main mirror holding part 372 moves up, the main mirror 371 retracts to a position avoiding the incident light beam.

  When the main mirror 371 is positioned on the incident light beam, the incident light beam incident through the lens unit 200 is reflected by the main mirror 371 and guided to the focusing screen 352. The focusing screen 352 is disposed at a position conjugate with the optical system of the lens unit 200, and visualizes an image formed by the optical system of the lens unit 200.

  The image on the focusing screen 352 is observed from the viewfinder 350 through the pentaprism 354 and the viewfinder optical system 356. Here, an erect image can be observed from the viewfinder 350 by observing the image through the pentaprism 354.

  The photometric sensor 390 is disposed above the finder optical system 356 and receives a part of the branched incident light beam. The photometric sensor 390 detects the subject brightness and causes the control unit 322 to calculate an exposure condition that is a part of the photographing condition.

  The main mirror 371 has a half mirror region that transmits a part of the incident light beam. The sub mirror 374 reflects a part of the incident light beam incident from the half mirror region toward the focusing optical system 380. The focusing optical system 380 guides a part of the incident incident light beam to the focus detection sensor 382. Thereby, the control unit 322 determines the target position of the lens that moves when the optical system of the lens unit 200 is focused.

  When the release button is half-pressed in the single-lens reflex camera 100 including the lens unit 200 and the camera body 300 as described above, the focus detection sensor 382 and the photometric sensor 390 are enabled, and a subject image can be taken under appropriate shooting conditions. It becomes a state.

  Next, when the release button is fully pressed, the main mirror 371 and the sub mirror 374 move to the retracted position, and the shutter unit 310 is opened. Thereby, the incident light beam incident from the lens unit 200 passes through the low-pass filter 332 and enters the image sensor 330. In this way, an image formed on the imaging surface of the imaging element 330 is captured by the optical system of the lens unit 200.

  FIG. 2 is a schematic diagram showing a partial cross section of the lens unit 200 in the expanded cylinder state, and shows the third lens group 230 and the fourth lens group 240 and their driving mechanisms. Although the shape of each part is simplified for the purpose of simplifying the drawing, the same reference numerals are assigned to the same elements as those in FIG. 1 and redundant description is omitted.

  In the lens unit 200, the rectilinear protrusion 259 of the front moving frame 207 and the rectilinear protrusion 269 of the rear moving frame 209 individually engage with rectilinear grooves formed independently on the inner surface of the fixed cylinder 201. . Thereby, when the lens unit 200 is in the retracted state, the rear end portions of the front side moving frame 207 and the rear side moving frame 209 occupy the same position in the direction parallel to the optical axis X, and in the cross section including the optical axis X Can overlap. Accordingly, the rear end of both the front side moving frame 207 and the rear side moving frame 209 can be retracted until they both abut against the rear surface of the fixed cylinder 201, and the length of the lens unit 200 in the optical axis X direction can be shortened.

  When the zoom ring 202 is rotated in the lens unit 200, the cam cylinder 290 connected to the zoom ring 202 by the connection pin 299 also moves around the optical axis X relative to the fixed cylinder 201 together with the zoom ring 202. Rotate. Since the upper end of the cam pin 292 provided in the vicinity of the rear end of the cam cylinder 290 is engaged with the cam groove 402 formed on the inner surface of the fixed cylinder 201, when the cam cylinder 290 rotates, it is guided to the cam groove 402. The cam cylinder 290 is guided to the cam pin 292 and moves inside the fixed cylinder 201 in the direction of the optical axis X.

  When the cam tube 290 rotates around the optical axis X, the cam pin 296 that is fixed to the cam tube 290 and rotates together with the cam tube 290 is also driven by the front moving frame 207 that engages with the cam groove 256. Power is transmitted. The rotation of the front-side moving frame 207 is restricted by the rectilinear groove 401 with which the rectilinear protrusion 259 is engaged. Therefore, when the driving force is transmitted from the cam groove 256, the front moving frame 207 moves in a direction parallel to the optical axis X without rotating.

  Similarly, when the cam cylinder 290 rotates around the optical axis X, the cam groove 294 formed on the inner surface of the cam cylinder 290 also rotates with the cam cylinder 290. Accordingly, the driving force is also transmitted to the rear moving frame 209 having the cam pin 264 that engages with the cam groove 294. The rotation of the rear moving frame 209 is restricted by a rectilinear groove 404 with which the rectilinear protrusion 269 engages. Therefore, when the driving force is transmitted to the cam pin 264, the rear moving frame 209 moves in a direction parallel to the optical axis X without rotating.

  The lens holding frame 242 that holds the fourth lens group 240 is formed integrally with the rear moving frame 209. Therefore, when the rear moving frame 209 moves in the optical axis X direction with respect to the fixed cylinder 201, the fourth lens group 240 also moves in the optical axis X direction.

  A lens holding frame 232 that holds the third lens group 230 is coupled to the rack member 278. The rack member 278 meshes with a feed screw 274 that is rotationally driven by a stepping motor 272. The motor assembly 270 includes a fixing member 276 that integrally supports the stepping motor 272 and the feed screw 274. The fixing member 276 is fixed to the holding cylinder 280. As a result, the stepping motor 272 and the feed screw 274 are fixed to the holding cylinder 280.

  The holding cylinder 280 has a cylinder part 282 and an attachment part 284. It is fixed to the fixing member 276 and the cylindrical portion 282. The attachment portion 284 is fixed to the front side moving frame 207 by a set screw 286. As a result, the motor assembly 270 is fixed to the front side moving frame 207 and moves integrally with the front side moving frame 207 in the optical axis X direction. Therefore, when the front-side moving frame 207 moves in the optical axis X direction with respect to the fixed cylinder 201, the third lens group 230 also moves in the optical axis X direction.

  As described above, when the zoom ring 202 is operated in the lens unit 200, the distance between the third lens group 230 and the fourth lens group 240 is caused by a series of actions of the cam pins 264, 292, 296 and the cam grooves 294, 402, 256. Changes. As a result, the magnification of the optical system of the lens unit 200 changes.

  Note that the cam pins 264, 292, and 296 are disposed at different positions in the circumferential direction of the lens unit 200. Therefore, these elements do not appear simultaneously in a single cross section including the optical axis X of the lens unit 200. However, in FIG. 2, these elements are shown together on a single cross section for the purpose of illustrating the interaction of the cam pins 264, 292, 296.

  Further, when driving power is supplied to the stepping motor 272 in the lens unit 200, the feed screw 274 is rotationally driven, and the driving force is transmitted to the rack member 278. Accordingly, the lens holding frame 232 holding the third lens group 230 moves in the optical axis X direction with respect to the front side moving frame 207 and the holding cylinder 280. In this manner, the holding cylinder 280 supports the lens holding frame 232 that holds the third lens group 230 so as to be movable in the optical axis X direction.

  Therefore, in the lens unit 200, the lens holding frame 232 that holds the third lens group 230 is independently operated with respect to the holding cylinder 280 and the front side moving frame 207 by operating the stepping motor 272 of the motor assembly 270. Move in the direction of the optical axis X. Thereby, the focal position of the optical system of the lens unit 200 is changed, and an image formed by the optical system of the lens unit 200 can be formed on the imaging surface of the imaging element 330.

  FIG. 3 is a perspective view showing a single holding cylinder 280 as viewed from above in FIGS. 1 and 2. The holding cylinder 280 includes a cylinder part 282 and an attachment part 284 that are integrally formed.

  The cylindrical portion 282 of the holding cylinder 280 has a substantially cylindrical shape, but has an opening 288 formed by removing a part in the circumferential direction. A pair of flat regions 285 and 287 forming a flat plane adjacent to the opening 288 in the circumferential direction of the tube portion 282 are formed on the outer peripheral surface of the tube portion 282.

  A pair of screw holes 283 and a boss 281 are arranged in one flat region 285 located on the upper side in the drawing. The pair of screw holes 283 are formed in a direction orthogonal to the flat region 285. The boss 281 is formed so as to protrude from the flat region 285 in the radial direction of the cylindrical portion 282. A jig receiving portion 289 is disposed in the other flat region 287 located on the lower side in the drawing. The jig receiving portion 289 is formed as a round hole orthogonal to the flat region 287.

  The attachment portion 284 of the holding cylinder 280 is formed in a flange shape that expands in the radial direction from the front end of the cylinder portion 282. The front surface of the attachment portion 284 has a flat region orthogonal to the cylindrical portion 282 and has a portion that is in close contact with the back surface of the front-side moving frame 207.

  FIG. 4 is a perspective view showing a process of attaching the motor assembly 270 to the holding cylinder 280. When attaching the motor assembly 270 to the holding cylinder 280, first, the feed screw 274 side of the motor assembly 270 is inserted into the opening 288 of the holding cylinder 280.

  When the tip of the fixing member 276 of the motor assembly 270 inserted into the opening 288 approaches the back surface of the mounting portion 284, the plate-like fixing member 276 straddles the pair of flat regions 285 and 287 of the holding cylinder 280. Thereby, the flat regions 285 and 287 located at both ends of the opening 288 in the circumferential direction of the holding cylinder 280 are connected, and at least a part of the opening 288 is covered with the fixing member 276.

  On the upper side in the figure of the fixing member 276 that has entered the opening 288, the boss 281 of the holding cylinder 280 enters the notched contact portion 271 provided in the fixing member 276. Further, a pair of insertion holes 273 provided through the fixing member 276 reach a position where it overlaps the screw hole 283 of the holding cylinder 280. However, since the inner diameter of the insertion hole 273 is larger than the inner diameter of the screw hole 283, the screw hole 283 can be seen inside the insertion hole 273.

  Further, on the lower side of the fixing member 276 in the figure, a positioning hole 279 provided through the fixing member 276 reaches the vicinity of the jig receiving portion 289 of the holding frame. The positioning hole 279 has substantially the same inner diameter and shape as the jig receiving portion 289.

  As described above, when the fixing member 276 of the motor assembly 270 is inserted into the opening 288 of the holding cylinder 280, the contact portion 271 of the fixing member 276 and the boss 281 of the holding cylinder 280 are engaged. However, the fixing member 276 at this stage can move in the tangential direction with respect to the cylindrical portion 282 by sliding on the surfaces of the flat regions 285 and 287 of the holding cylinder 280.

  FIG. 5 is a perspective view showing the next stage of the process of attaching the motor assembly 270 to the holding cylinder 280. FIG. 5 is drawn from the same perspective as FIG. 4 and common elements are given the same reference numbers.

  Subsequently, the fixing member 276 inserted into the opening 288 is moved in the circumferential direction of the holding cylinder 280 to bring the boss 281 of the holding cylinder 280 into contact with the back of the contact portion 271. Thereby, the position of the fixing member 276 with respect to the holding cylinder 280 is also positioned in the circumferential direction of the holding cylinder 280. As described above, the boss 281 and the abutting portion 271 form a first positioning portion that positions the fixing member 276 and the holding cylinder 280 by mutual abutment.

  In the above example, the first positioning portion is formed by the cylindrical boss 281 and the contact portion 271 cut into a U shape. However, as long as the relative positions of the fixing member 276 and the holding cylinder 280 along the plane including the flat regions 285 and 287 can be determined, the first positioning portion can be formed by combining other shape members. .

  For example, a contact portion 271 formed by a V-shaped cut may be combined with the cylindrical boss 281. Further, the boss 281 and the contact portion 271 may have a complementary shape in an arbitrary shape. In this case, for example, a three-dimensional contact portion 271 is formed on a part of the fixing member 276 by bending or pressing, and a receiving portion having a shape complementary to the contact portion 271 is formed on the holding cylinder 280 side. May be provided.

  In addition, when the upper end side of the fixing member 276 in the drawing is positioned with respect to the holding cylinder 280 by the first positioning portion, the positioning hole 279 provided on the lower end side of the fixing member 276 in the drawing has the jig of the holding cylinder 280. It occupies a position overlapping with the tool receiving portion 289. In other words, the jig receiving portion 289 is provided corresponding to the position of the positioning hole 279 when the contact portion 271 of the fixing member 276 contacts the boss 281.

  Furthermore, the state where the fixing member 276 is positioned as described above is fixed by the jig 410. That is, the insertion portion 412 provided at the tip of the jig 410 is inserted into the positioning hole 279 of the fixing member 276 as shown by an arrow A in the drawing, and further, is inserted into the jig receiving portion 289 of the holding cylinder 280. By fixing, the fixing member 276 is restrained to the flat region 287 by the jig 410. As a result, the fixing member 276 is positioned with respect to the flat region 287 of the holding cylinder 280 also on the lower side of the opening 288 in the figure. As described above, the positioning hole 279 and the jig receiving part 289 form a second positioning part for positioning the fixing member 276 and the holding cylinder 280 with respect to each other by inserting the insertion part 412 of the jig 410.

  Thus, when the fixing member 276 is positioned at a predetermined position with respect to the holding cylinder 280, the set screw 420 is inserted into the insertion hole 273 of the fixing member 276 and further screwed into the screw hole 283 of the holding cylinder 280. It is. Thereby, the state in which the fixing member 276 is positioned with respect to the holding cylinder 280 is fixed.

  FIG. 6 is a partial plan view showing a process of fastening the set screw 420. FIG. 6 shows a state in which the fixing member 276 is looked down from a direction orthogonal to the fixing member 276.

  In the illustrated stage, the contact portion 271 of the fixing member 276 is in contact with the boss 281 of the holding cylinder 280 in the circumferential direction of the holding cylinder 280. Further, the positioning hole 279 of the fixing member 276 is locked by the insertion portion 412 of the jig 410 whose tip is inserted into the jig receiving portion 289. Therefore, the fixing member 276 is coupled to the holding cylinder 280 on both sides of the opening 288 of the holding cylinder 280.

  In the state as described above, when the set screw 420 is screwed into the screw hole 283 of the holding cylinder 280, the screw head of the set screw 420 comes into contact with the surface of the fixing member 276 and the fixing member 276 is moved to the outer periphery of the holding cylinder 280. Press toward the surface. From this state, when the set screw 420 is further screwed in, the flat region 287 of the holding cylinder 280 locked to the lower end of the fixing member 276 in the figure by the insertion portion 412 of the jig 410 is directed toward the opposite side of the opening 288. Be attracted.

  For this reason, the right side of the holding cylinder 280 in the drawing is reduced in diameter, and the holding cylinder 280 is bent as indicated by the symbol θ in the drawing. In order to securely fix the fixing member 276 to the holding cylinder 280, the set screw 420 must be fastened with a sufficient tightening torque, and it is difficult to avoid the bending of the holding cylinder 280 at this stage.

  FIG. 7 is a partial plan view showing the next stage of the process of attaching the motor assembly 270 to the holding cylinder 280. It is drawn from the same point of view as in FIG. 6, and common elements are given the same reference numbers.

  When the fastening of the set screw 420 is completed as described above, the jig 410 is removed by holding the holding part 414 of the jig 410 and pulling it out from the jig receiving part 289 and the positioning hole 279. As a result, the locking of the fixing member 276 with respect to the flat region 287 is released, and the flat region 287 of the holding cylinder 280 is released from the fixing member 276. Therefore, the holding cylinder 280 eliminates bending due to its own elasticity.

  As described above, the holding cylinder 280 is bent in the process of attaching the motor assembly 270. However, the bending of the holding cylinder 280 is eliminated by removing the jig 410 after fastening the set screw 420.

  The tip of the insertion portion 412 of the jig 410 is repeatedly inserted into the positioning hole 279 and the jig receiving portion 289 every time the lens unit 200 is assembled. Therefore, workability can be improved by chamfering the edge of the tip.

  FIG. 8 is a perspective view of the holding cylinder 280 with the motor assembly 270 attached thereto. The fixing member 276 of the motor assembly 270 maintains a state where the back of the contact portion 271 is in contact with the boss 281, and the motor assembly 270 is positioned at a position defined by the boss 281. Further, since the fixing member 276 is fastened to the holding cylinder 280 by a pair of set screws 420 sufficiently fastened at one end of the opening 288, the positioned state is continuously stored.

  Further, the flat region 287 of the holding cylinder 280 is opened from the fixing member 276 at the other end of the opening 288. Therefore, the holding cylinder 280 is accurately restored to its original shape.

  The combination of the positioning hole 279 forming the second positioning portion and the jig receiving portion 289 and the jig 410 is not limited to the above example. That is, other shapes may be combined as long as the relative positions of the fixing member 276 and the holding cylinder 280 are temporarily fixed, and the fixing can be released after the set screw 420 is fastened.

  For example, the insertion portion 412 of the jig 410 may have another shape such as a rectangle, a wedge shape, or a conical shape, and the positioning hole 279 and the jig receiving portion 289 may have a shape complementary to the insertion portion 412. Further, the positioning hole 279 and the jig receiving portion 289 may be cuts or the like formed in the rear end side edge portion of the fixing member 276 and the holding cylinder 280. Further, the insertion portion 412 of the jig 410 may have a slight elasticity so that the jig 410 can be held by itself when inserted through the positioning hole 279 and the jig receiving portion 289.

  In the above embodiment, the single-lens reflex camera 100 including the interchangeable lens unit 200 has been described as an example. However, the above-described structure can be applied even to a non-flex camera not including a quick return mirror. In addition to a camera in which the lens unit 200 and the camera body 300 are integrated, the above structure can be applied to a telescope, a surveying instrument, a microscope, and the like that include an optical member driven by a cam mechanism.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

100 single-lens reflex camera, 200 lens unit, 201 fixed cylinder, 202 zoom ring, 203 rectilinear cylinder, 204 front cylinder, 206 guide cylinder, 207 front side moving frame, 209 rear side moving frame, 208 lens side mount part, 210 1st Lens group, 212, 222, 232, 232, 242 Lens holding frame, 220 Second lens group, 230 Third lens group, 240 Fourth lens group, 256, 294, 402 Cam groove, 259, 269 Straight projection, 264 , 292, 296 Cam pin, 270 Motor assembly, 271 Contact part, 272 Stepping motor, 273 Insertion hole, 274 Feed screw, 276 Fixing member, 278 Rack member, 279 Positioning hole, 280 Holding cylinder, 281 Boss, 282 Tube part , 283 Screw hole, 284 mounting part, 285, 287 flat Carrier region, 286, 420 Set screw, 288 opening, 289 Jig receiving part, 290 cam cylinder, 299 connecting pin, 300 camera body, 310 shutter unit, 320 substrate, 322 control unit, 324 image processing unit, 330 image sensor 332 Low-pass filter, 340 Display unit, 350 finder, 352 Focusing screen, 354 Penta prism, 356 Finder optical system, 360 Body side mount unit, 370 Mirror unit, 371 Main mirror, 372 Main mirror holding unit, 373 Rotating main mirror Axis, 374 sub mirror, 375 sub mirror holding section, 376 sub mirror rotation axis, 380 focusing optical system, 382 focus detection sensor, 390 photometric sensor, 410 jig, 412 insertion section, 414 gripping section

Claims (5)

A holding cylinder having a shape including an opening formed by removing a part of the cylinder in the circumferential direction;
A fixing member that covers at least a part of the opening and is fixed to the holding cylinder;
One is provided on one side of a pair of regions facing each other across the opening in the holding cylinder, and the other is provided at a corresponding position in the fixing member, and is fixed to the holding cylinder by fitting each other. A first positioning part for determining the position of the member;
One is provided on the other side of the pair of regions of the holding cylinder, and the other is provided at a corresponding position on the fixing member, and the positions are constrained to each other via a jig, and the jig is removed for positioning. A second positioning part for releasing the restraint of
A set screw for screwing the fixing member to the holding cylinder on the side where the first positioning portion of the pair of regions in the holding cylinder is provided;
Lens barrel with   A holding frame that is supported by the holding cylinder so as to be movable in the optical axis direction of the optical member while holding the optical member; and an actuator that is supported by the fixing member and drives the holding frame with respect to the holding cylinder. The lens barrel according to claim 1, further comprising:   The said 1st positioning part is formed in the said holding | maintenance cylinder, is penetrated by the positioning hole formed in the said fixing member, and contains the protrusion part closely_contact | adhered to the circumferential direction of the said holding | maintenance cylinder. Lens barrel.   An optical apparatus comprising the lens barrel according to any one of claims 1 to 3. One of the holding cylinders having a shape including an opening formed by removing a part in the circumferential direction of the cylinder, provided on one side of a pair of regions facing each other with the opening therebetween, and at least one of the openings A first positioning step for determining the position of the fixing member with respect to the holding cylinder by fitting the other one provided at a corresponding position in the fixing member covering the part with each other;
A second positioning step of restraining the positions of the one provided on the other side of the pair of regions in the holding cylinder and the other provided at a corresponding position in the fixing member with respect to each other via a jig;
On the side of the pair of regions in the holding cylinder where the first positioning portion is provided, a screwing step of screwing the fixing member to the holding cylinder;
A lens barrel manufacturing method comprising: an opening stage in which positioning constraints are released by removing the jig.

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