JP2015227922A - Lens holding member manufacturing method, and slide core mold, lens barrel, and imaging device for use in the manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens holding member manufacturing method with which a lens holding member is easily manufactured and the lens holding member is threadingly engaged with a screwing member with a pressure-welding force, and also to provide a slide core mold, a lens barrel, and an imaging device for use in the manufacturing method.SOLUTION: A method of manufacturing a lens barrel 1 as a lens holding member according to the present invention comprises a nest position adjustment step and a molding step. In the nest position adjustment step are used a slide core body 103 having a first screw molding part 131 and a nest 104 having a second screw molding part 141 and movably held by the slide core body 103 in a radial direction of the first screw molding part 131, and when a male screw part 11, 12 of the lens barrel 1 is threaded into a female screw part 221 of a barrel holder 202, the radial position of the nest 104 with respect to the slide core body 103 is adjusted such that the second screw part is pressure-welded to the female screw part 221. In the molding step, the male screw part of the lens holding member having the first and second screw parts is injection-molded.

Description

  The present invention relates to a method for manufacturing a lens holding member such as a lens barrel for holding a lens, a slide core mold used in the manufacturing method, a lens barrel, and an imaging device.

  A camera unit used in a mobile phone or the like has a lens barrel that is a lens holding member that has a male screw portion on the outer peripheral portion and holds a lens on the inner peripheral portion, and a female screw portion to which the male screw portion of the lens barrel is screwed. A barrel holder that is a threaded member, and the internal thread portion of the barrel holder so that the focus of the lens held in the lens barrel is at a position on the light receiving surface (imaging surface) of the image sensor attached to the camera unit In general, the initial position setting is adjusted by rotating the male screw portion of the lens barrel.

  At that time, when the looseness (clearance) of the lens barrel with respect to the barrel holder is large in a state where the female threaded portion of the barrel holder and the male threaded portion of the lens barrel are screwed together, the lens barrel is tilted due to vibration or the like after adjustment. , Optical performance decreases. On the other hand, even when the play of the lens barrel relative to the barrel holder is small, the lens barrel rotates due to vibration or the like with respect to the barrel holder, the distance to the image sensor changes, and the optical performance deteriorates. Therefore, it is necessary to ensure a pressure contact force that prevents the lens barrel from moving due to vibration or the like with respect to the barrel holder in the screwed state.

  Further, if the pressure contact force is too large, there is a possibility that screwing cannot be performed manually or automatically, or the imaging device including the lens barrel and the barrel holder may be damaged. Therefore, it is necessary to have a pressing force that can be easily screwed, does not move due to vibrations, and does not damage the lens barrel and the imaging device.

  However, the range of the appropriate pressure contact force that satisfies the above conditions is narrow, and in the method of additionally processing the screw shape of the mold for forming the screw, the range of the appropriate pressure contact force due to the setting error on the processing machine or the processing error. Often deviate from

  A lens unit configured to ensure such an appropriate pressure contact force is disclosed in Patent Document 1, for example. The lens unit disclosed in Patent Document 1 is provided with a rib that is in pressure contact with the tip of the thread of the female threaded portion of the barrel holder at a part of the bottom of the male threaded portion of the lens barrel. On the other hand, a pressure contact force in the radial direction of the male screw portion is applied, so that the lens barrel does not rattle against the barrel holder.

  Further, for example, Patent Document 2 discloses a screw component and an image pickup apparatus that secure a pressure contact force. The screw component disclosed in Patent Document 2 is provided with a protrusion on the slope of the thread of the male screw of the lens barrel, and is pressed against the slope of the thread of the female thread portion of the barrel holder during screwing. The lens barrel is fixed so that the lens barrel does not rattle against the barrel holder.

JP 2006-163130 A JP 2010-133458 A

  However, in the above-mentioned Patent Document 1, since the pressure contact force in the radial direction of the male screw portion is applied to the barrel barrel by the rib at the time of screwing, the axial backlash is orthogonal to the radial direction of the male screw portion. As a result, there are cases where the lens barrel is assembled with an axial inclination with respect to the barrel holder at the time of screwing, and the optical performance may be deteriorated.

  On the other hand, in Patent Document 2, it is difficult to make the protrusion amount (protrusion height) of the protrusions of the lens barrel, and it may be difficult to manufacture easily. Specifically, for example, if one protrusion has a larger amount of protrusion than the other protrusions, the lens barrel is assembled in an axial direction with respect to the barrel holder during screwing. In this case, it is possible to make the protrusions uniform by correcting the mold (slide core mold) for manufacturing the lens barrel, but it takes time to correct the slide core mold.

  The present invention relates to a method for manufacturing a lens holding member in which a lens holding member is screwed to a screwing member with a pressing force, and the pressing force can be easily adjusted, a slide core mold used in the manufacturing method, and a lens barrel. And an imaging apparatus.

  The manufacturing method of the lens holding member according to one aspect of the present invention includes a slide having a first screw forming portion for forming a first screw portion that is a part of the male screw portion in a lens holding member having a male screw portion on an outer peripheral portion. A second screw forming portion for forming a core body and a second screw portion which is another part of the male screw portion, and held in the slide core body so as to be movable in a radial direction of the first screw forming portion; The male screw portion is inserted into the female screw portion when the male screw portion is screwed into the female screw portion of the screwing member to which the male screw portion of the lens holding member is screwed. A nesting position adjusting step for adjusting the radial position of the nesting with respect to the slide core main body so that the second screw portion is in pressure contact, and a state in which the nesting is adjusted with respect to the slide core main body And the first screw portion and the second screw portion, A forming step of forming a male threaded portion of the lens holding member having characterized in that it comprises.

  According to this, when the male screw part of the lens holding member is screwed to the female screw part of the screwing member by adjusting the radial position of the first screw forming part of the nesting with respect to the slide core body In addition, the second screw portion can be pressed against the female screw to receive a pressing force in the radial direction and the axial direction, and the lens holding member is screwed to the screwing member with the pressing force without being inclined in the axial direction. The Further, when the lens holding member is manufactured, the position of the nesting may be adjusted with respect to the slide core body, which facilitates the manufacturing of the lens holding member.

  In another aspect, in the method for manufacturing the lens holding member, the second screw forming portion is configured such that the male screw portion of the lens holding member and the female screw portion of the screwing member are screwed together. The second screw portion is formed so that the second screw portion of the male screw portion is in line contact with the female screw portion.

  According to this, since the second screw forming portion forms the second screw portion so that the female screw portion and the second screw portion of the male screw portion are in line contact, the second screw portion of the male screw portion is female. Compared with the case where the male screw part comes into surface contact with the female screw part, for example, when the screw part is screwed to the screw part, the contact area is reduced, and the amount of increase in the pressure contact force with respect to the adjustment amount of the nest is reduced. Since the allowable range of the position of the nesting for the purpose is increased, the adjustment becomes easy.

  A slide core mold according to an aspect of the present invention is a slide core mold used in a method for manufacturing a lens holding member having an external thread portion on an outer peripheral portion, and includes a first thread portion that is a part of the external thread portion. A slide core main body having a first screw forming portion to be formed, and a second screw forming portion for forming a second screw portion which is another part of the male screw portion, and the male screw portion on the slide core main body And a nesting inserted so as to be movable in the radial direction.

  According to this, when the male screw part of the lens holding member is screwed to the female screw part of the screwing member by adjusting the radial position of the first screw forming part of the nesting with respect to the slide core body In addition, it is possible to manufacture a lens holding member in which the second threaded portion is pressed against the slope of the female screw and can receive a pressing force in the radial direction and the axial direction, and the manufacturing of the lens holding member becomes easy.

  The lens barrel of one aspect of the present invention has a slide core main body having a first screw forming portion and a second screw forming portion, and is held by the slide core main body so as to be movable in the radial direction of the male screw portion. A lens barrel manufactured using a nest, wherein the outer peripheral portion has a first screw portion formed by the first screw forming portion and a second screw forming portion and is formed by the second screw forming portion. A male screw portion having a second screw portion projecting in the radial direction is provided, and a lens holding portion for holding one or a plurality of lenses is provided on the inner peripheral portion.

  According to this, the second screw portion formed by the second screw forming portion protrudes radially outward from the first screw portion formed by the first screw forming portion, and the male screw portion of the lens holding member is screwed. When screwed into the female screw of the member, the second screw portion can contact the female screw and receive a pressure contact force in the radial direction and the axial direction. Thereby, the lens barrel is screwed to the screwing member with a pressing force without being inclined in the axial direction.

  An imaging apparatus according to an aspect of the present invention includes an imaging optical system that includes the lens barrel, one or more optical lenses held in a lens holding portion of the lens barrel, and forms an optical image of an object, and the optical image. And an image pickup device that converts the signal into an electrical signal.

  According to this, when the second screw portion of the male screw portion of the lens barrel is screwed to the female screw of the screwing member, the second screw portion receives a pressure contact force in the radial direction and the axial direction by being pressed against the female screw. Is screwed to the screwing member with a pressing force without being inclined in the axial direction. As a result, the position of the lens held in the lens barrel can be accurately adjusted to the image pickup device, the optical performance can be prevented from being deteriorated, and the image pickup apparatus can be easily manufactured.

  The manufacturing method of the lens holding member of the present invention, the slide core mold, the lens barrel, and the imaging device used in the manufacturing method can be easily manufactured, with the lens holding member screwed to the screwing member with a pressing force. .

It is a perspective view of the lens barrel of one embodiment of the present invention. It is a schematic perspective view of the slide core metal mold | die used when manufacturing the lens barrel of FIG. It is a perspective view of the state which shape | molded the lens barrel of FIG. 1 using the slide core metal mold | die. FIG. 3 is a detailed perspective view of the slide core mold of FIG. 2. It is a disassembled perspective view of the imaging device which has a lens barrel. It is a perspective view of the imaging device of FIG. It is a top view of the imaging device of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is the IX-IX sectional view taken on the line of FIG. FIG. 6 is an enlarged cross-sectional view of a main part of a female screw part of a barrel holder and a second screw part of a male screw of a lens barrel in a state where a female screw part of a barrel holder used in the imaging apparatus of FIG. 5 and a male screw of a lens barrel are screwed together. . FIG. 6 is an enlarged cross-sectional view of a main part of a female screw part of a barrel holder and a first screw part of a male screw of a lens barrel in a state where a female screw part of a barrel holder used in the imaging apparatus of FIG. 5 and a male screw of a lens barrel are screwed together. . It is a perspective view of other embodiments of a lens barrel. It is a perspective view of the state which shape | molded the lens barrel of other embodiment of FIG. 12 using the slide core metal mold | die. It is a principal part expanded sectional view of the state which the 2nd thread part of the lens barrel of other embodiment was screwed together with the internal thread part of the barrel holder. It is a principal part expanded sectional view of the state which the 2nd thread part of the lens barrel of another another embodiment screwed together with the internal thread part of a barrel holder.

  Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an embodiment of a lens barrel of the present invention, and FIG. 2 is a schematic perspective view of a slide core mold used when manufacturing the lens barrel of FIG.

  A lens barrel (lens holding member) 1 of the present invention has a cylindrical body having a circular through-opening (light-transmitting opening) for transmitting a light beam of an optical image transmitted through a lens 14 (shown in FIG. 8) described later. The outer peripheral portion includes male screw portions 11 and 12, and the inner peripheral portion includes a lens holding portion 13 that holds an optical lens.

  The male screw part includes a first screw part 11 and a second screw part 12. In this embodiment, the second screw portion 12 is disposed at two equal intervals in the circumferential direction of the first screw portion 11.

  In this embodiment, each second screw portion 12 is formed in the same screw shape and pitch as the first screw portion 11 (see FIGS. 10 and 11). Each second screw portion 12 is formed to have a larger radius than the first screw portion 11, and protrudes radially outward from the first screw portion 11. In this embodiment, the thread angle α1 of the first screw portion 11 and the second screw portion 12 is set to 60 °.

  The lens holding unit 13 holds one or a plurality of lenses 14 (see FIGS. 8 and 9).

  The lens barrel 1 configured in this manner is molded by injection molding using a manufacturing mold having slide core molds 102a and 102b.

  Specifically, the manufacturing mold includes a mold body 101 and slide core molds 102 a and 102 b that slide with respect to the mold body 101 as shown in FIG. 2. Although not shown, the mold main body 101 includes a core, a cavity, and the like, and a lens barrel molding portion that molds a lens barrel is formed between the core and the cavity.

  The slide core molds 102 a and 102 b form a part of the lens barrel molding portion of the mold body 101 and mold the male screw portions 11 and 12 of the lens barrel 1. The slide core mold of this embodiment includes two parts, a first slide core mold 102a and a second slide core mold 102b.

  The first slide core mold 102a and the second slide core mold 102b have the same configuration, are arranged so as to face each other, and each have a pair of contact surfaces 103a that contact each other at the tip. The slide core body 103 and the insert 104 held movably in each of the slide core bodies 103 are provided.

  The contact surface 103a of the slide core body 103 is provided with a first screw forming portion 131 for forming the first screw portion 11 of the lens barrel 1 by injection molding. The first screw forming portion 131 is recessed in an arc shape from the contact surface 103a, and a screw portion corresponding to the first screw portion 11 is formed.

  The nest 104 includes a second screw forming portion 141 for forming the second screw portion 12 of the lens barrel 1 by injection molding at the tip. The second screw forming portion 141 is recessed in an arc shape having the same curvature as the first screw forming portion 131 of the slide core main body 103, and a screw portion corresponding to the second screw portion 12 is formed.

  The insert 104 is inserted into a insert insertion hole 132 provided in the slide core body 103 so as to be movable in the radial direction of the first screw forming portion 131. Further, in this state, the second screw forming portions 141 of the two inserts 104 are exposed to the first screw forming portions 131 of the slide core body 103 and face each other, and the circumferential direction of the first screw forming portions 131 is set. And a semicircular shape with the first screw forming portion 131.

  The contact surfaces 103a of the two slide core bodies 103 are in contact with each other, and the first screw forming portion 131 and the second screw forming portion 141 of the insert 104 are continuously aligned with each other in the radial direction. One circular female thread is formed.

  Further, the insert 104 inserted into the insert insertion hole 132 is fixed to a fixing member such as a bolt after the position of the slide core body 103 with respect to the first screw forming portion 131 is adjusted by the position adjusting spacer 142 as shown in FIG. 143 is fixed to the slide core main body 103.

  Next, a method for manufacturing the lens barrel 1 using a manufacturing mold will be described. The female screw data relating to the female screw portion 221 of the barrel holder (screwing member) 202 shown in FIGS. 8 and 9 to which the lens barrel 1 is screwed is acquired in advance by a screw detecting device (not shown), and the female screw data is obtained. Based on the above, the radial position of the second screw forming portion 141 of the nesting 104 is adjusted (nesting position adjusting step).

  More specifically, based on the female screw data, when the male screw parts 11 and 12 of the lens barrel 1 are screwed into the female screw part 221 of the barrel holder 202, the second screw part 12 can be in pressure contact with the female screw part 221. In this way, the radial position of the second screw forming portion 141 of the insert 104 (the radius of the second screw forming portion 141) is adjusted by the position adjusting spacer 142.

  The second screw forming portion 141 of the nest 104 after the position adjustment in this way is located on the radially outer side with respect to the first screw forming portion 131 of the slide core main body 103.

  Then, as shown in FIG. 3, a sprue (not shown) in which molten resin is provided on the mold body 101 in a state where the mold body 101 is set so that the contact surfaces 103 a of the two slide core bodies 103 are in contact with each other. Then, it is injected into the lens barrel molding part of the mold body 101 through the runner and cooled and solidified (molding process). Thereby, the lens barrel 1 shown in FIG. 1 provided with the male screw portions 11 and 12 on the outer peripheral portion and the lens holding portion 13 on the inner peripheral portion is obtained.

  The lens barrel 1 manufactured in this way is used for the imaging device 200, for example. As shown in FIGS. 5 to 9, the imaging device 200 of this embodiment includes an imaging device body, a lens barrel 1 held by the imaging device body, a lens 14 held by the lens barrel 1, and an optical image. An image sensor 201 for converting the signal into an electrical signal.

  The main body of the imaging apparatus includes a barrel holder 202 that is screwed into the lens barrel 1 and holds the lens barrel 1 fixedly, a drive member 203 that drives the barrel holder 202, and a cover 204.

  The barrel holder 202 has a cylindrical shape, and includes an internal thread portion 221 that is screwed into the external thread portions 11 and 12 of the lens barrel 1 on the inner peripheral portion.

  The drive member 203 drives the barrel holder 202 holding the lens barrel 1 in the axial direction (optical axis direction). Thereby, the lens 14 held by the lens barrel 1 moves in the optical axis direction. In this embodiment, the drive member 203 uses a voice coil motor (Voice Coil Motor, VCM: electromagnetic actuator) composed of a coil 203 a held by the barrel holder 202 and a magnet 203 b held by the cover 204.

  The image sensor 201 performs photoelectric conversion into image signals of R (red), G (green), and B (blue) components according to the amount of light in the optical image of the object (subject) imaged by the imaging optical system. This element outputs to a predetermined image processing circuit (not shown). The image sensor 201 is, for example, a CCD type image sensor, a CMOS type image sensor, or the like.

  The image sensor 201 is disposed on the image side in the optical axis direction of the lens 14 held by the lens barrel 1 as shown in FIGS.

  The lens barrel 1 has the same configuration as that shown in FIG. The lens barrel 1 is held by the barrel holder 202 as follows.

  The male screw portions 11 and 12 of the lens barrel 1 are screwed into the female screw portion 221 of the barrel holder 202. At that time, as shown in FIG. 10, the lens barrel 1 is screwed with the second screw portion 12 in pressure contact with the female screw portion 221 of the barrel holder 202, and the lens barrel 1 rotates without looseness with the barrel holder 202. Get to the state. In this state, the first screw portion 11 is not in contact with the female screw portion 221 of the barrel holder 202.

  In this state, the lens barrel 1 is rotated with respect to the barrel holder 202 so that the position of the lens 14 with respect to the image sensor 201 becomes the initial setting position. When the lens barrel 1 is rotated, the second screw portion 12 rotates in a pressure contact state with the female screw portion 221 of the barrel holder 202, so that the lens barrel 1 rotates without being inclined with respect to the barrel holder 202.

  After the lens barrel 1 is adjusted to the initial setting position with respect to the barrel holder 202, the lens barrel 1 and the barrel holder 202 are fixedly held by being bonded with an adhesive.

  In the imaging apparatus 200 configured in this manner, the barrel holder 202 moves along the optical axis direction when electric power is supplied to the driving member 203.

  In the above embodiment, the second threaded portion 12 of the lens barrel 1 is composed of two. However, the configuration is not limited to this, and may be one or three or more, and the configuration can be changed as appropriate. For example, as shown in FIGS. 12 and 13, the second screw portion 312 of the lens barrel 1 may be composed of three (in FIG. 12, two second screw portions 312 appear).

  Specifically, the slide core mold is composed of three parts: a first slide core mold 302a, a second slide core mold 302b, and a third slide core mold 302c that have the same configuration arranged in the circumferential direction. Yes.

  The first slide core mold 302a, the second slide core mold 302b, and the third slide core mold 302c are respectively inserted into the slide core body 303 and the slide core body 303 so as to be movable. And.

  At the tip of each slide core main body 303, a first screw forming portion 331 that is recessed in an arc shape and has a screw portion corresponding to the first screw portion 311 is formed on both sides of the first screw forming portion 331 in the circumferential direction. The contact surface 332 with which the adjacent slide core main bodies 303 contact each other is provided.

  Each insert 304 includes a second screw forming portion 341 at the tip. The second screw forming portion 341 is recessed in an arc shape having the same curvature as the first screw forming portion 331 of the slide core main body 303, and a screw portion corresponding to the second screw portion 312 is formed.

  Each insert 304 is inserted into a insert insertion hole 333 provided in the slide core body 303 so as to be movable in the radial direction of the first screw forming portion 331. Further, in this state, the second screw forming portions 341 of the three inserts 304 are respectively exposed to the first screw forming portions 331 of the slide core main body 303 and disposed on the circumferential direction side of the first screw forming portions 331. Yes.

  In this case as well, two adjacent contact surfaces 332 of the three slide core bodies 303 are in contact with each other, and the first screw forming portion 331 and the second screw forming portion 341 are aligned in the radial direction. In the state, one continuous circular female screw is formed.

  In the above embodiment, the thread angle α1 of the second threaded portion 12 of the lens barrel 1 is formed to be the same as the thread angle of the female threaded portion 221 of the barrel holder 202. The thread angle may be formed to be different from the thread angle of the female threaded portion 221 of the barrel holder 202.

  For example, as shown in FIG. 14, the screw thread angle α <b> 3 of the second screw portion 412 may be formed smaller than the screw thread angle α <b> 2 of the female screw portion 221 of the barrel holder 202. By being formed in this way, when the second screw portion 412 is screwed into the female screw portion 221 of the barrel holder 202, the tip of the slope of the thread of the second screw portion 412 is the tip of the female screw portion 221 of the barrel holder 202. Line contact is made with the slope of the thread (point contact in the cross section of FIG. 14). As a result, in the state where the second screw portion 412 is screwed into the female screw portion 221 of the barrel holder 202, the rotational resistance of the lens barrel 1 with respect to the barrel holder 202 causes the screw thread of the second screw portion 412 and the female screw portion 221 of the barrel holder 202 to move. This is smaller than the rotational resistance when the screw thread is in surface contact. Therefore, there is an advantage that it is easy to adjust the position of the lens barrel 1 with respect to the barrel holder 202.

  Moreover, in the said embodiment, although the thread of the 2nd thread part 12 of the lens barrel 1 was formed in cross-sectional substantially triangular shape, it is not restricted to the thing of this form, It can change suitably. For example, as shown in FIG. 15, the thread of the second screw portion 512 of the lens barrel 1 may be formed in a curved cross section (arc shape). Thus, even if the thread of the second screw portion 512 of the lens barrel 1 is formed in a curved cross section, the second screw portion 512 is screwed onto the female screw portion 221 of the barrel holder 202 in the same manner as shown in FIG. When they are combined, the thread of the second threaded portion 512 makes line contact (point contact in the cross section of FIG. 15) with the slope of the thread of the female threaded portion 221 of the barrel holder 202, and the rotational resistance of the lens barrel 1 with respect to the barrel holder 202 is reduced. It becomes small and it becomes easy to adjust the position of the lens barrel 1 with respect to the barrel holder 202.

  Moreover, in the said embodiment, although the lens barrel 1 was manufactured as a lens holding member, it is not restricted to the thing of the form from which the lens barrel 1 is manufactured, for example, the male screw of the lens barrel of an interchangeable lens is manufactured as a lens holding member. Can be changed as appropriate.

  In order to express the present invention, the present invention has been properly and fully described through the embodiments with reference to the drawings. However, those skilled in the art can easily change and / or improve the above-described embodiments. It should be recognized that this is possible. Therefore, unless the modifications or improvements implemented by those skilled in the art are at a level that departs from the scope of the claims recited in the claims, the modifications or improvements are not covered by the claims. To be construed as inclusive.

1 Lens barrel 11 First screw part (male thread part)
12 Second screw part (male screw part)
14 Lens 102a First slide core mold (slide core mold)
102b Second slide core mold (slide core mold)
DESCRIPTION OF SYMBOLS 104 Nest 131 1st screw shaping | molding part 141 2nd screw shaping | molding part 200 Imaging device 201 Imaging element 202 Barrel holder (screwing member)
221 Female thread

Claims (5)

A slide core body having a first screw forming portion for forming a first screw portion which is a part of the male screw portion in a lens holding member having a male screw portion on the outer periphery, and another part of the male screw portion Using a nest that has a second screw forming portion for forming a second screw portion and is held in the slide core body so as to be movable in the radial direction of the first screw forming portion,
When the male screw portion is screwed to the female screw portion of the screwing member to which the male screw portion of the lens holding member is screwed, the second screw portion of the male screw portion is connected to the female screw portion. A nesting position adjusting step for adjusting the radial position of the nesting with respect to the slide core body so as to be in pressure contact;
A molding step of molding the male screw portion of the lens holding member having the first screw portion and the second screw portion in a state in which the position of the insert is adjusted with respect to the slide core body,
A method for manufacturing a lens holding member.   The second screw forming portion is configured such that when the male screw portion of the lens holding member and the female screw portion of the screwing member are screwed together, the second screw portion of the male screw portion is connected to the female screw portion. The method for manufacturing a lens holding member according to claim 1, wherein the second screw portion is formed so as to be in line contact. A slide core mold used in a manufacturing method of a lens holding member having an external thread part on an outer peripheral part,
A slide core body having a first screw forming portion for forming a first screw portion which is a part of the male screw portion;
A nest that has a second screw forming portion that forms a second screw portion that is another part of the male screw portion, and is held in the slide core body so as to be movable in the radial direction of the first screw forming portion. ,
A slide core mold characterized by comprising: A lens barrel manufactured using a slide core main body having a first screw forming portion and a nest that has a second screw forming portion and is held in the slide core main body so as to be movable in a radial direction of the male screw portion. Because
A first screw portion formed by the first screw forming portion and a second screw portion formed by the second screw forming portion and projecting in a radial direction from the first screw portion are provided on the outer peripheral portion. With a male thread,
A lens barrel comprising a lens holding part for holding one or a plurality of lenses on an inner peripheral part. A lens barrel according to claim 4;
An imaging optical system that includes one or a plurality of lenses held in a lens holding portion of the lens barrel and forms an optical image of an object;
An image sensor for converting the optical image into an electrical signal;
An imaging apparatus comprising:

Images