JP2009175183A - Lens barrel with barrier device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel with a barrier device, reducing the size by fixing a lens to a lens holding part in a lens barrel frame, and mounting a barrier device between the lens and the lens barrel frame in a compact manner. <P>SOLUTION: The lens 10 is fixed to a lens fixing frame part 110A of the lens holding part 101 disposed inside a cylinder hole in the lens barrel frame 1, and the lens fixing frame part 110A is provided with a clearance recessed part 102. A first barrier blade and a driving ring 2 are mounted in a compact manner using a space expanded between the outer peripheral surface of the lens 10 and the lens barrel frame 1 by providing the recess part 102. A reinforcing rib part 202 projected on the inner peripheral surface of the driving ring 2 is passed through the space of the clearance recessed part 102, whereby the driving ring 2 is fitted to a bearing part 110B. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lens barrel with a barrier device in which an openable barrier device that protects the front surface of a lens of a photographing optical system is mounted on a lens barrel frame.

  2. Description of the Related Art Generally, a lens barrel with a barrier device attached to a camera is provided with a barrier device that opens and closes barrier blades in conjunction with an advance / retreat movement of a barrel frame.

  In this lens barrel with a barrier device, a ring-shaped lens holding portion is integrally extended from the inner peripheral surface of the barrel frame toward the center of the barrel inside a cylindrical barrel frame. At the center of this lens holding part, a small cylindrical ring is formed integrally, the lens is placed in the opening of this cylindrical ring, and the periphery of the cylindrical ring is crimped to fix the lens There is a thing of structure to do.

  In the lens barrel with a barrier device having such a structure, in order to secure the optical path of the photographing optical system lens to the maximum, a space that can be formed between the lens outer periphery in the lens barrel frame and the inner peripheral surface of the lens barrel frame is provided. A barrier device is installed.

In order to configure this barrier device, a drive ring is mounted on the lens barrel frame so as to be rotatable around the optical axis with the outer peripheral surface of the cylindrical ring portion fixing the lens as a sliding surface. Furthermore, a barrier blade is mounted in the barrel frame so as to open and close the front surface of the photographic lens in response to the rotation operation of the drive ring (see, for example, Patent Document 1).
JP 2004-258120 A

  In the lens barrel with the barrier device having such a configuration, when the lens is fixed to the tube ring portion in the lens barrel frame by heat caulking, a ring-shaped free end circle in the tube ring portion in the lens barrel frame is used. The peripheral part is deformed by heat caulking. Further, during the heat caulking process, a caulking convex portion protruding in the outer peripheral direction (radial direction) of the cylindrical ring portion is formed in the cylindrical ring portion in the lens barrel frame.

  For this reason, when the drive ring is pivotally mounted on the outer peripheral surface of the cylindrical ring portion, in order to avoid interference with the caulking convex portion, a bearing portion that becomes a convex portion higher than the protruding height of the caulking convex portion is provided with the cylindrical portion. It must be provided on the outer periphery of the ring. When such a bearing portion is provided on the outer peripheral surface of the cylindrical ring portion, the cylindrical ring portion becomes thick and the outer diameter increases. Therefore, the inner diameter of the drive ring that is pivotally attached to the cylindrical ring portion having an increased outer diameter must be increased, and the outer diameter is increased accordingly, so that the entire drive ring is also increased in size.

  Some lens barrels with a barrier device have a structure in which the outer peripheral surface of the drive ring is axially attached so as to slide on the inner peripheral surface of the lens barrel frame. In the case of this structure, the caulking convex portion protrudes from the outer peripheral surface of the cylindrical ring portion. Therefore, in order to avoid the inner peripheral surface of the drive ring facing the caulking convex portion from the outer peripheral surface of the cylindrical ring portion between the outer peripheral surface of the cylindrical ring portion and the inner peripheral surface of the drive ring. It is necessary to provide a large clearance distance.

  Therefore, it is necessary to increase the inner diameter of the drive ring, and the outer diameter of the drive ring is increased. Furthermore, since the outer diameter of the drive ring increases, all the parts related to the barrier device must be shifted and arranged in the outer diameter direction. The entire lens barrel with the device is enlarged. In the lens barrel with a barrier device, even when the lens is attached to the tube ring portion of the lens holding portion in the lens barrel frame by the adhesive, the convex portion similar to the caulking convex portion is caused by the protrusion of the adhesive. May be formed. Even in this case, the entire lens barrel with the barrier device is enlarged due to the convex portion formed by the protrusion of the adhesive.

  An object of the present invention is to provide a lens barrel with a barrier device in which a lens is fixed to a lens holding portion in a lens barrel frame and a barrier device is compactly mounted between the lens and the lens barrel frame to reduce the size. It is to provide.

  In order to achieve the above object, the lens barrel with a barrier device according to claim 1 is the lens barrel with a barrier device in which a barrier blade is attached to a front surface of a lens held by a barrel frame so as to be opened and closed. A lens holding part disposed inside the tube hole of the lens barrel frame, and a lens fixing frame part formed in a small cylindrical shape around the central opening of the lens holding part for fixing the lens by a fixing means A bearing portion formed in a small cylindrical shape around the lens fixing frame portion of the lens holding portion, a drive ring that is pivotally attached to a peripheral bearing surface portion on the outer periphery of the bearing portion, and the drive ring The reinforcing rib portion formed so as to rise from the inner peripheral surface corresponding to the range of the operation space setting portion so as to increase the cross-sectional area, and the opening end side of the small tube of the lens fixing frame portion are used for the reinforcement. Passing over the width of the rib A relief recess formed by cutting out and a barrier blade having a base end pivotally attached to the lens holding portion, and a lever portion provided on the barrier blade in the space of the relief recess The barrier blade is configured to at least open by interlocking with the rotation operation of the drive ring by abutting against a contact portion provided on the drive ring.

  According to the present invention, by providing an escape recess in the lens holding portion in the lens holding part in the lens barrel frame, the space between the lens outer periphery and the lens barrel frame is widened to form a compact barrier device. By doing so, there is an effect that the lens barrel with the barrier device can be miniaturized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view showing components that are essential parts of a lens barrel with a barrier device according to an embodiment of the present invention.

  In FIG. 1, the lens barrel with a barrier device of the present embodiment is configured by incorporating a barrier device on the free end side of a lens barrel frame 1 that holds a lens 10. Further, a cam cylinder that is rotated is mounted on the base end side of the lens barrel frame 1 (not shown). The lens barrel frame 1 is configured to move back and forth in the optical axis direction in conjunction with the rotation of the cam barrel.

  The lens barrel frame 1 is configured as shown in FIGS. 2, 7, 8, 9, 10, 10, 12, and 14. FIG. FIG. 2 is an enlarged perspective view showing the lens barrel frame taken out. FIG. 7 is a front view of the barrier device in the barrier open state. FIG. 8 is a cross-sectional view showing a cut surface taken along line AA of FIG. FIG. 9 is an enlarged cross-sectional view of a main part showing a structure part for fixing the lens 10 to the lens barrel frame 1. FIG. 10 is an enlarged cross-sectional view of a main part showing another structural part for fixing the lens 10 to the lens barrel frame 1.

  As shown in FIG. 2, on the base end side of the outer peripheral portion of the lens barrel frame 1, a rectangular protruding piece protrudes from the predetermined six locations in the optical axis direction, and from the inside near the free end to the central direction (radial direction) The interlocking pin 11 that is interlocked with the cam cylinder protrudes toward the head.

  A lens holding part 101 for holding the lens 10 is provided inside the tube hole of the lens barrel frame 1. As shown in FIG. 8, the lens holding portion 101 integrally extends from the inner peripheral surface of the lens barrel frame 1 toward the center of the tube hole inside the tube hole of the lens barrel frame 1 formed in a cylindrical shape. A ring plate portion 111 is provided. Further, the lens holding portion 101 is formed in a substantially U-shaped cross section around the central opening of the ring plate portion 111, and is arranged concentrically around the lens fixing frame portion 110A around the central opening. The formed bearing portion 110B is integrally provided.

  That is, the periphery of the circular opening of the lens holding portion 101 is formed in the small cylindrical lens fixing frame portion 110A. The lens 10 is fixedly disposed on a small cylindrical inner peripheral surface portion 120 of the lens fixing frame portion 110A with a heat caulking structure as a fixing means. For this reason, a holding step 121 having a ring-shaped mounting end surface is formed on the inner peripheral surface portion 120 of the small cylinder by making the cross section stepped. Further, a step peripheral portion 10A having a stepped cross section is formed on the outer peripheral portion of the lens 10.

  In the process of fixing the lens 10 to the lens fixing frame part 110A by heat caulking, the stepped peripheral part 10A of the lens 10 is placed on the inner peripheral surface part 120 of the lens fixing frame part 110A.

  In this state, as shown in FIG. 9, the heat caulking-shaped convex portion 105 is formed by plastically deforming a portion on the free end portion of the opening peripheral portion of the inner peripheral surface portion 120 by heat caulking. As a result, the lens 10 is held by the lens fixing frame 110 </ b> A of the lens barrel frame 1 with the stepped peripheral portion 10 </ b> A sandwiched between the heat caulking-shaped convex portion 105 and the holding stepped portion 121.

  The heat caulking-shaped convex portion 105 has a shape protruding so that the tip corner portion of the inner peripheral surface portion 120 is bent toward the lens 10 side. At the same time, in the heat caulking-shaped convex portion 105, a portion at a position opposite to the tip corner portion protrudes in a triangular shape from the outer peripheral surface portion 122 of the lens fixing frame portion 110A toward the outer side in the radial direction around the optical axis O. The protrusion 123 is formed.

  As shown in FIG. 2, the lens holding portion 101 of the lens barrel frame 1 is a rotary bearing portion that supports the rotary shaft 403 of each first barrier blade 4 at each predetermined position of the ring plate portion 111. One bearing hole 104 is provided. At the same time, a second bearing hole 103 is provided at each predetermined position of the ring plate portion 111 as a rotational bearing portion that supports the rotating shaft rod 303 of each second barrier blade 3. In this lens barrel frame 1, in order to constitute a barrier device, two first barrier blades 4 and two second barrier blades 3 are mounted so as to be openable and closable. For this reason, the first bearing hole 104 and the second bearing hole, which are rotary bearing portions, are respectively provided at two predetermined symmetrical positions (two predetermined positions corresponding to the diameter direction passing through the optical axis O) of the ring plate portion 111. 103. The barrier device may be composed of one or a plurality of barrier blades.

  Further, a relief recess 102 is formed in the lens holding portion 101 of the lens barrel frame 1 at a predetermined position in the vicinity corresponding to each first bearing hole 104 that is a rotary bearing portion. The relief recess 102 is formed in a shape in which the opening end portion of the cylindrical opening portion of the lens fixing frame portion 110A is cut out over a predetermined width.

  That is, in this lens fixing frame portion 110A, the relief recess 102 is formed in advance, and thereafter, the lens 10 is fixed by heat caulking. The relief recess 102 of the lens fixing frame portion 110 </ b> A lacks a predetermined depth on the opening end side of the small tube portion including the heat caulking-shaped protrusion 105 over the width of the reinforcing rib portion 202. Side view exhibits the formation of a rectangular groove.

  The relief recess 102 is also used as a space for at least opening the lever portion 402 provided on the first barrier blade 4 described later by contacting the contact portion 203 provided on the drive ring 2. It is. The number of relief recesses 102 is the same as the number of reinforcing ribs 202.

  As shown in FIGS. 8 to 10, a drive ring (drive ring) 2 is pivotally attached to the bearing portion 110 </ b> B provided in the lens holding portion 101 of the lens barrel frame 1. For this reason, the drive ring 2 is supported by the bearing portion 110B on the peripheral bearing surface portion 130 corresponding to the inner peripheral surface thereof. That is, the drive ring 2 is supported so as to be rotatable with respect to the lens barrel frame 1 in a so-called outer diameter fitting state that slides on the circumferential bearing surface portion 130.

  The drive ring 2 is configured as shown in FIGS. FIG. 3 is a front view showing the drive ring 2 taken out. FIG. 4 is a perspective view showing the drive ring 2 taken out. FIG. 5 is a rear view showing the drive ring 2 taken out. FIG. 6 is an enlarged rear view of the main part, showing a portion where the outer diameter fitting portion 206 of the drive ring 2 is provided.

  As shown in the figure, the drive ring 2 includes a fitting rail portion 200 that is an annular member. The fitting rail portion 200 is provided with an outer diameter fitting portion 206 slidably in contact with the circumferential bearing surface portion 130 of the bearing portion 110B at a plurality of locations (here, each of six equal portions) on the outer circumferential surface. . The outer diameter fitting portion 206 is formed in an arcuate shape having a predetermined length, and is integrally provided on the outer peripheral surface of the fitting rail portion 200.

  In the mounting structure in which the drive ring 2 is attached to the bearing portion 110B of the lens holding portion 101, the fitting rail portion 200 of the drive ring 2 is placed in an annular groove having a substantially U-shaped cross section in the lens holding portion 101 of the lens barrel frame 1. Insert into. Furthermore, in this mounting structure, by sliding a plurality of (here, six) outer diameter fitting portions 206 provided on the fitting rail portion 200 on the peripheral bearing surface portion 130 of the bearing portion 110B, The drive ring 2 is attached so as to be rotatable.

  In the drive ring 2, the first auxiliary member 210 and the second auxiliary member 211 are arranged on the front end surface of the fitting rail portion 200 (the end surface opposite to the side attached to the lens holding portion 101). The first auxiliary member 210 and the second auxiliary member 211 are each formed in a semicircular arc shape, and an abutting portion 203 for interlocking with the lever portion 402 provided on the first barrier blade 4 is formed at each tip portion. To do.

  In the drive ring 2, the contact portion 203 at the distal end of the first auxiliary member 210 faces the proximal end portion of the second auxiliary member 211 with a predetermined interval, and the contact portion 203 at the distal end of the second auxiliary member 211 is the first. The auxiliary member 210 is configured to face the base end portion with a predetermined interval.

  In addition, the drive ring 2 includes small rectangular protrusions 212 on an outer peripheral portion at an intermediate position of the portion where the first auxiliary member 210 is disposed and an outer peripheral portion at an intermediate position of the portion where the second auxiliary member 211 is disposed. Project. On the front plane of each small rectangular protrusion 212, a spring hook portion 201 is provided.

  In the drive ring 2 configured as described above, an operation space for the first barrier blade 4 having a structure bridged by only the fitting rail portion 200 is formed between the contact portion 203 and the base end portion facing each other. Is done. That is, in this drive ring 2, only the operation space portion of the first barrier blade 4 is not reinforced by the first auxiliary member 210, the second auxiliary member 211, and the small rectangular protruding piece 212.

  The drive ring 2 in which the space for operating the first barrier blade 4 is formed is attached to the lens barrel frame 1 as shown in FIG. FIG. 15 is a front view showing a state in which the drive ring 2 and the first barrier blade 4 are attached to the lens barrel frame 1.

  As shown in FIG. 15, in the lens barrel with a barrier device according to the present embodiment, a portion corresponding to the operation space of the first barrier blade 4 in the drive ring 2 attached to the barrel frame 1 is provided. Various parts are aggregated. That is, in this lens barrel frame 1, the space for operation of the first barrier blade 4 in the drive ring 2, the rotation center shaft 403, the spring hooking portion on a substantially straight line passing through the optical axis O in a plane perpendicular to the optical axis O. 401 and the lever part 402 need to be arranged. For this reason, the clearance setting of this part is reflected in the outer diameter of the lens barrel frame 1 as it is.

  For this reason, this drive ring 2 is formed so that the fitting rail portion 200 of the operation space portion of the first barrier blade 4 is made thin in the thrust direction, the outer diameter in the radial direction is reduced, and the strength is maintained. It is necessary to configure.

  Therefore, as shown in FIGS. 3, 4, and 9, the reinforcing rib that protrudes in a bowl shape from a predetermined portion of the inner peripheral surface corresponding to the range of the operation space setting portion (weak strength portion) of the drive ring 2. A portion 202 is formed. That is, the reinforcing rib portion 202 is reinforced in the range of the operating space setting portion (weak strength portion) in which the fitting rail portion 200 is formed thin in the thrust direction in order to provide an operating space for the first barrier blade 4. A rib portion 202 is formed. The reinforcing rib portion 202 is formed by protruding the inner peripheral surface of the fitting rail portion 200 from the rear side end surface of the drive ring 2 to a predetermined position near the front side end surface in a rectangular shape in front view. As a result, as shown in FIG. 9, the reinforcing rib portion 202 is configured so as to have a clearance space in which the heat caulking-shaped convex portion 105 is placed on the front end surface 202A.

  When the drive ring 2 formed with the reinforcing rib portion 202 is attached to the lens barrel frame 1, the reinforcing rib is formed on the relief recess 102 formed in the lens holding portion 101 of the lens barrel frame 1. The drive ring 2 is fitted through the portion 202. For this reason, the circumferential width of the relief recess 102 is formed to be larger than the circumferential width of the reinforcing rib portion 202.

  As shown in FIG. 9, the drive ring 2 attached to the lens barrel frame 1 is in a state where the front end face 202 </ b> A of the reinforcing rib portion 202 in the drive ring 2 enters the lower side of the heat caulking-shaped convex portion 105. , Rotate around the lens fixing frame 110A. Therefore, the reinforcing rib portion 202 of the drive ring 2 is not interfered with the heat caulking-shaped convex portion 105.

  In other words, according to the configuration of the lens barrel with the barrier device described above, the relief recess 102 (shown in FIG. 2) is provided in the lens fixing frame portion 110A of the lens barrel frame 1. As a result, it is possible to provide the reinforcing rib portion 202 at the radial inner diameter portion (inner peripheral surface portion) in the operation space setting portion (weak strength portion) of the drive ring 2. Thereby, the cross-sectional area of the fitting rail part 200 which comprises the operation space setting part (weak intensity | strength part) of the drive ring 2 can be increased, and intensity | strength can be ensured, and the outer diameter of the drive ring 2 can be restrained small. Overall size can be reduced.

  A pair of first barrier blades 4 is attached to the barrel frame 1 to which the drive ring 2 is attached in this manner. Each first barrier blade 4 is rotatably attached by inserting the rotating shaft rod 403 into the corresponding first bearing hole 104.

  Further, the lens barrel frame 1 is configured such that the barrier blade 4 opens and closes following the rotational driving of the drive ring 2. For this reason, in this lens barrel frame 1, each contact portion 203 of the drive ring 2 is provided on a lever portion 402 (illustrated in FIG. 1) which is a protrusion protruding from a predetermined position near the rotary shaft 403 of the barrier blade 4. It is configured to abut.

  Further, in this lens barrel frame 1, the contact portion 203 of the drive ring 2 and the lever of the barrier blade 4 are within the space of the relief recess 102 formed by cutting out a part of the lens fixing frame portion 110 </ b> A of the lens barrel frame 1. The unit 402 is configured to abut.

  That is, the lever portion 402 is configured to move in the space of the escape recess 102 when the first barrier blade 4 rotates around the rotary shaft 403 to open and close. When configured in this manner, the positions of the lever portion 402 and the rotary shaft rod 403 of the first barrier blade 4 can be brought closer to the optical axis O by moving the lever portion 402 near the outer periphery of the lens 10. . Therefore, the outer diameter of the entire lens barrel frame 1 can be reduced.

  For example, in the lens barrel frame 1, when the escape recess 102 is not provided in the lens holding portion 101, it is necessary to avoid the lever portion 402 from colliding with the lens holding portion 101. For this reason, in the lens barrel frame 1, the lever portion 402 is configured to move outside the outer peripheral surface of the lens holding portion 101, and the positions of the lever portion 402 and the rotary shaft 403 of the first barrier blade 4 are light positions. The distance from the axis O increases, and the outer diameter of the entire lens barrel frame 1 increases.

  In the configuration of the lens barrel frame 1, an increase in the outer diameter of the entire lens barrel frame 1 in order to avoid the lens holding portion 101 is avoided by providing a relief recess 102 in the lens holding portion 101. The overall outer diameter is reduced.

  Further, in the lens barrel frame 1, as shown in FIG. 15, a tension spring 4 a that is a tension coil spring is stretched between the pair of first barrier blades 4 and the drive ring 2. For this reason, one end portion of the tension spring 4a is hooked on the spring hooking portion 401 which is a hooking protrusion protruding from a predetermined position near the rotary shaft 403 of the first barrier blade 4. Then, the other end portion of the tension spring 4 a is hooked on each spring hook portion 201 of the drive ring 2. Accordingly, as shown in FIG. 15, the lever portion 402 of the first barrier blade 4 is kept in pressure contact with the contact portion 203 by the urging force of the tension spring 4a.

  A pair of second barrier blades 3 is attached to the barrel frame 1 so as to perform an opening / closing operation in synchronization with the pair of first barrier blades 4. As shown in FIG. 1, the barrier blade 3 projects a rotation center shaft 303 at the base end portion thereof. Further, the torsion spring 3 a is assembled to the shaft portion formed coaxially with the rotation center shaft 303 in the second barrier blade 3.

  In the second barrier blade 3, the rotation center shaft 303 is pivotally attached to the second bearing hole 103 (shown in FIG. 2), one end of the torsion spring 3a is locked to the lens barrel frame 1, and the other end is second. The barrier blade 3 is engaged with the spring hook 301 protruding from the middle portion of the barrier blade 3 and assembled. The pair of barrier blades 3 assembled in this way are in pressure contact with the corresponding barrier blades 4 by the urging force of the torsion springs 3a, respectively, and open / close operation following the rotational drive of the barrier blades 4 Is configured to be performed.

  In addition, the lens barrel 1 accommodates and holds the drive ring 2, the second barrier blade 3, and the first barrier blade 4 that are attached to the lens holding portion 101, so that a barrier cover is provided in front of the first barrier blade 4. 5 is fixedly arranged by a bayonet structure. Further, a barrier cap 6 for preventing the barrier cover 5 from rotating and coming off is attached to the lens barrel frame 1 in front of the barrier cover 5.

  Next, the opening / closing operation of the barrier device in the lens barrel with the barrier device configured as described above will be described.

  First, the case where the first barrier blade 4 and the second barrier blade 3 are changed from the fully closed state (the state shown in FIG. 11) to the fully opened state (the state shown in FIG. 7) will be described. In this case, an operation of moving the lens barrel frame 1 from the retracted state to the photographing state by the operation of extending the lens barrel is performed. In this operation, although not shown, the cam cylinder is rotated by the driving means. In conjunction with the rotation of the cam barrel, the lens barrel frame 1 is extended forward, and the drive portion 204 of the drive ring 2 is separated from the power transmission surface formed on the cam barrel. Then, the drive ring 2 rotates clockwise (in the direction of arrow R in FIG. 15) about the optical axis by the spring force of the charged tension spring 4a.

  By the rotation of the drive ring 2, the first barrier blade 4 follows the drive ring 2 and rotates counterclockwise (in the direction of arrow S in FIG. 15) about the rotation center axis 403. Further, the second barrier blade 3 rotates clockwise around the rotation center axis 303 following the operation of the first barrier blade 4 rotating counterclockwise (in the direction of arrow S in FIG. 15). By this operation, the first barrier blade 4 and the second barrier blade 3 are retracted from the opening of the barrier cover 5 and are fully opened by exposing the front surface of the lens 10 (state of FIG. 7).

  Next, the case where the 1st barrier blade | wing 4 and the 2nd barrier blade | wing 3 are made into a fully closed state (state of FIG. 11) from a fully open state (state of FIG. 7) is demonstrated.

  In this case, although not shown, the cam cylinder is reversed by the driving means. As the cam barrel is reversed, the lens barrel 1 is moved backward. At the same time, the drive portion 204 of the drive ring 2 comes into contact with the power transmission surface of the cam cylinder, and the drive ring 2 rotates counterclockwise about the optical axis O while charging the tension spring 4a (reverse to the arrow R in FIG. 15). Direction). Due to the rotation of the drive ring 2, the first barrier blade 4 is pulled by the tension spring 4a and rotates clockwise about the rotation center axis 403 (in the direction opposite to the arrow S in FIG. 15). Furthermore, the second barrier blade 3 rotates counterclockwise around the rotation center axis 303 following the operation in which the first barrier blade 4 rotates clockwise. By this operation, the first barrier blade 4 and the second barrier blade 3 enter into the opening of the barrier cover 5 and are mutually closed to be fully closed so as to cover the front surface of the lens 10 (see FIG. 11). Status).

  Although the case where the lens 10 is fixed to the lens holding portion 101 of the lens barrel frame 1 by heat caulking in the above-described embodiment has been described, the present invention is not limited to this. The present invention can also be applied to the case where the lens 10 is fixed to the lens holding portion 101 by various fixing means. For example, when the lens 10 is attached to the lens holding portion 101 with an ultraviolet curable adhesive, the protrusion protrudes when the adhesive protrudes from the lens fixing frame portion 110A or for other reasons. Of course, the present invention can also be applied to cases.

It is a disassembled perspective view which shows the components used as the principal part of the lens barrel with a barrier apparatus concerning embodiment of this invention. It is an expansion perspective view which takes out and shows a lens-barrel frame. It is a front view which takes out and shows a drive ring. It is a perspective view which takes out and shows a drive ring. It is a rear view which takes out and shows a drive ring. It is a principal part enlarged rear view which takes out and shows the part in which the outer diameter fitting part of the drive ring was provided. It is a front view of the barrier device showing the fully opened state of the first barrier blade and the second barrier blade. It is sectional drawing which shows the cut surface by the AA line of FIG. It is a principal part expanded sectional view which takes out and shows the structure part which fixes a lens to the lens-barrel frame in the fully open state of the 1st barrier blade | wing and 2nd barrier blade | wing which are the B-1 range of FIG. It is a principal part expanded sectional view which takes out and shows the other structural part which fixes a lens to the lens-barrel frame in the fully open state of the 1st barrier blade | wing and 2nd barrier blade | wing which are the C-1 range of FIG. It is a front view of the barrier device showing the fully closed state of the first barrier blade and the second barrier blade. It is sectional drawing which shows the cut surface by the FF line of FIG. FIG. 12 is an enlarged cross-sectional view of a main part taken out and showing a structure portion for fixing a lens to a lens barrel frame in a fully closed state of the first barrier blade and the second barrier blade, which is in the range B-2 in FIG. 11. FIG. 12 is an enlarged cross-sectional view of a main part taken out and showing another structural part for fixing the lens to the lens barrel frame in the fully closed state of the first barrier blade and the second barrier blade, which is the range C-2 in FIG. 11. It is a front view which shows the state which attached the drive ring and the 1st barrier blade | wing to the lens-barrel frame.

Explanation of symbols

1 lens barrel frame 2 drive ring 3 second barrier blade 4 first barrier blade 10 lens 1
DESCRIPTION OF SYMBOLS 101 Lens holding part 102 Relief recessed part 103 2nd bearing hole 104 1st bearing hole 105 Heat caulking-shaped convex part 110 Bearing holding part 110A Lens fixing frame part 110B Bearing part 111 Ring plate part 123 Projection part 130 Circumferential bearing surface part 200 Fitting Rail part 201 Spring hook part 202 Reinforcing rib part 202A Front side end face 203 Abutting part 210 First auxiliary member 211 Second auxiliary member 303 Rotation center axis 402 Lever part 403 Rotation axis rod

Claims (5)

In the lens barrel with a barrier device in which the barrier blade is attached to the front surface of the lens held by the lens barrel frame so as to be opened and closed,
A lens holding portion disposed inside a tube hole of the lens barrel frame;
A lens fixing frame portion formed in a small cylindrical shape for fixing the lens by a fixing means around a central opening of the lens holding portion;
A bearing portion formed in a small cylindrical shape around the lens fixing frame portion of the lens holding portion;
A drive ring pivotally attached to a peripheral bearing surface portion of the outer periphery of the bearing portion;
A reinforcing rib portion formed so as to protrude from the inner peripheral surface corresponding to the range of the operation space setting portion in the drive ring to increase the cross-sectional area;
A relief recess formed by notching the opening end portion side of the small tube of the lens fixing frame portion over a width equal to or larger than the width of the reinforcing rib portion;
A barrier blade having a base end portion pivotally attached to the lens holding portion;
In the space of the relief recess, a lever portion provided on the barrier blade abuts on a contact portion provided on the drive ring, so that the barrier blade at least opens in conjunction with the rotation operation of the drive ring. A lens barrel with a barrier device, characterized in that it is configured as described above.   2. The barrier device according to claim 1, wherein the fixing means is a caulking, and is formed in a relief concave portion in which a portion including a convex portion formed by caulking is cut out in the lens fixing frame portion. Lens barrel.   The lens barrel with a barrier device according to claim 1, wherein the fixing means is an ultraviolet curable adhesive.   4. The lens barrel with a barrier device according to claim 1, wherein the same number of relief recesses of the lens fixing frame portion and reinforcing rib portions of the drive ring are provided. 5.   5. The lens barrel with a barrier device according to claim 1, wherein the relief concave portion of the lens fixing frame portion is disposed in the vicinity of the rotary bearing portion of the barrier blade.

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