WO2013114904A1

WO2013114904A1 - Lens barrel

Info

Publication number: WO2013114904A1
Application number: PCT/JP2013/000591
Authority: WO
Inventors: 哲哉宇野
Original assignee: パナソニック株式会社
Priority date: 2012-02-02
Filing date: 2013-02-01
Publication date: 2013-08-08
Also published as: JP2015079016A

Abstract

Provided is a lens barrel that can be made compact. A lens barrel (20) has a second rotational frame (220) and a third straight moving frame (130). The second rotational frame (220) has first and second bayonet grooves (e31, e32) and a cam groove (b4) intersecting with the first and second bayonet grooves (e31, e32). The third straight moving frame (130) has first and second bayonet projections (E31, E32) engaging with the first and second bayonet grooves (e31, e32). When the first bayonet projection (E31) is located near the cam groove (b4), the second bayonet projection (E32) engages with the second bayonet groove (e32). When the second bayonet projection (E32) is located near the cam groove (b4), the first bayonet projection (E31) engages with the first bayonet groove (e31).

Description

Lens barrel

The technology disclosed herein relates to a lens barrel provided with an optical system.

Conventionally, in a lens barrel, a bayonet mechanism has been widely used for the purpose of rotatably engaging two frames (see, for example, Patent Document 1). The bayonet mechanism is constituted by a bayonet groove and a bayonet protrusion engaged with the bayonet groove.

JP 2009-134160 A

However, in the case where the cam groove is formed so as to intersect with the bayonet groove, when the bayonet protrusion is positioned in the cam groove, the bayonet protrusion enters the cam groove, thereby engaging the two frames. There is a risk of losing.
Note that if the bayonet groove is formed deeper than the cam groove, the engagement of the two frames is maintained. In this case, however, it is necessary to make the frame thicker in order to form the bayonet groove deeply. The size of the lens barrel in the radial direction is increased. Further, if the bayonet groove is formed deeper than the cam groove, the cam follower may be detached from the cam groove.

The technology disclosed herein has been made in view of the above situation, and an object thereof is to provide a compact lens barrel.

The lens barrel includes a first frame and a second frame. The first frame includes first and second bayonet grooves and at least one cam groove that intersects the first and second bayonet grooves. The second frame has first and second bayonet protrusions engaged with the first and second bayonet grooves. In the radial direction of the first frame, the depth of the first and second bayonet grooves is equal to or less than the depth of the cam grooves. In the circumferential direction of the first frame, the width of the first and second bayonet protrusions may be equal to or less than the width of the cam groove. When the first bayonet protrusion is positioned near the cam groove, the second bayonet protrusion is engaged with the second bayonet groove. When the second bayonet protrusion is located in the vicinity of the cam groove, the first bayonet protrusion is engaged with the first bayonet groove.

According to the technique disclosed herein, a lens barrel that can be made compact can be provided.

Perspective view of digital camera Perspective view of lens barrel Disassembled perspective view of lens barrel Perspective view of fixed frame Perspective view of the first rectilinear frame Perspective view of first rotating frame Perspective view of the second rectilinear frame Perspective view of second rotating frame Perspective view of the third rectilinear frame Schematic diagram of the second rectilinear frame, the second rotating frame, and the third rectilinear frame assembled. Perspective view of first lens group frame Perspective view of second lens group frame Perspective view of shutter frame The development which looked at the inner peripheral surface of the 2nd rotation frame from the diameter direction inner side Development view of the outer peripheral surface of the third rectilinear frame as viewed from the outside in the radial direction Schematic diagram for explaining the positional relationship between the bayonet protrusion and the cam groove Schematic sectional view of the lens barrel (collapsed state) Schematic cross section of lens barrel (wide state) Schematic cross section of lens barrel (telephoto state)

Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and the ratio of each dimension may be different from the actual one. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

In the following embodiments, a digital camera will be described as an example of the imaging device. In the following explanation, the subject side is “front”, the opposite side of the subject is “rear”, the vertical upper side is “up”, the vertical lower side is “lower”, and the subject is facing the subject, with a digital camera in landscape orientation as a reference. The right side is expressed as “right”, and the left side toward the subject is expressed as “left”. The landscape orientation is a kind of orientation of the digital camera. When photographing in the landscape orientation, the long side direction of the horizontally long rectangular image substantially coincides with the horizontal direction in the image.

<Configuration of digital camera 1>
The configuration of the digital camera 1 will be described with reference to the drawings. FIG. 1 is a perspective view of the digital camera 1. FIG. 2 is a perspective view of the lens barrel 20.
As shown in FIG. 1, the digital camera 1 includes a housing 10 and a lens barrel 20.
The housing 10 includes a front plate 11, a rear plate 12, and a side plate 13. The front plate 11 has an opening 10S.

The lens barrel 20 includes a three-stage retractable zoom mechanism. The lens barrel 20 is housed in the housing 10 when not photographing, and is drawn forward from the opening 10S when photographing. Specifically, as shown in FIG. 2, the lens barrel 20 includes a first movable barrel portion 21, a second movable barrel portion 22, a third movable barrel portion 23, and a fixed barrel portion 24. ,have.
The first movable barrel portion 21 can be extended with respect to the fixed barrel portion 24. The second movable lens barrel portion 22 can be extended with respect to the first movable lens barrel portion 21. The third movable lens barrel portion 23 can be extended with respect to the second movable lens barrel portion 22. The fixed barrel portion 24 is fixed in the housing 10. When the lens barrel 20 is extended, the third movable lens barrel portion 23 is located in the foremost position among the first to third movable lens barrel portions 21 to 23.

<Detailed configuration of lens barrel 20>
Next, the detailed configuration of the lens barrel 20 will be described with reference to the drawings. FIG. 3 is an exploded perspective view of the lens barrel 20.
The first to third movable lens barrel portions 21 to 23 of the lens barrel 20 are extended from the fixed barrel portion 24 along the optical axis AX of the optical system. The optical system includes first to fourth lens groups L1 to L4. In the following description, the direction parallel to the optical axis AX is “optical axis direction”, the direction perpendicular to the optical axis direction is “radial direction”, and the direction along the circle centered on the optical axis AX is “circumferential direction”. ". The optical axis AX substantially coincides with the axis of each frame constituting the lens barrel 20.

In the present embodiment, the “straight frame” means a frame that moves in the optical axis direction without rotating in the circumferential direction. “Rotating frame” means a frame that rotates in the circumferential direction. The “rotating frame” includes both the meaning of a frame that moves in the optical axis direction and a frame that does not move in the optical axis direction. The “straight groove” means a groove provided along the optical axis direction. The “straight groove” is provided in both the rectilinear frame and the rotary frame.

“Straight” means moving in the optical axis direction without rotating in the circumferential direction. “Rotation” means rotating in the circumferential direction. “Rotation” is used to mean both when moving in the optical axis direction and when not moving in the optical axis direction. “Move” is a concept including moving in the optical axis direction while rotating in the circumferential direction.
“Bayonet” or “Bayonet mechanism” means a mechanism in which frames having “bayonet protrusions” and “bayonet grooves” provided along the circumferential direction are engaged with each other in a rotatable manner, and integrally in the optical axis direction. Meaning mechanism to engage.

1. First moving lens barrel 21
The first movable lens barrel unit 21 includes a first rectilinear frame 110, a first rotating frame 210, and a first decorative frame 301. The first rectilinear frame 110 is a cylindrical resin member disposed on the inner side in the radial direction of the fixed frame 100 described later. The first rotating frame 210 is a cylindrical resin member disposed on the radially inner side of the first rectilinear frame 110. The first decorative frame 301 is a cylindrical sheet metal member that covers the outer periphery of the first rectilinear frame 110.

2. Second moving lens barrel 22
The second movable lens barrel 22 includes a second rectilinear frame 120, a second rotating frame 220, a third rectilinear frame 130, a second lens group frame 320, a second lens group L2, a third lens group frame 330, and a third lens. It has a group L3, a shutter frame 335, and a second decorative frame 302.
The second rectilinear frame 120 is a cylindrical resin member disposed on the radially inner side of the first rotating frame 210. The second rotating frame 220 is a cylindrical resin member disposed on the radially inner side of the second rectilinear frame 120. The third rectilinear frame 130 is a cylindrical resin member disposed on the radially inner side of the second rotating frame 220. The second lens group frame 320 is disposed on the radially inner side of the third rectilinear frame 130 and supports the second lens group L2 for zooming. The third lens group frame 330 is housed in the shutter frame 335 and supports the third lens group L3 for image blur correction. The third lens group frame 330 is supported by a shutter frame 335 so as to be swingable in the radial direction, and constitutes an image blur correction mechanism together with the third lens group L3. The shutter frame 335 is disposed on the radially inner side of the third rectilinear frame 130 and incorporates a shutter mechanism. The shutter frame 335 supports the third lens group frame 330 so as to be swingable in the radial direction. A flexible control wire 335 a is connected to the shutter frame 335. The control flexible wiring 335a is disposed along the inner peripheral surface of the fixed frame 100, and is connected to a control device (not shown). The control flexible wiring 335a transmits a control signal to a shutter mechanism and an image blur correction mechanism described later. The second decorative frame 302 is a cylindrical sheet metal member that covers the outer periphery of the second rectilinear frame 120.

3. Third moving lens barrel 23
The third movable lens barrel unit 23 includes a first lens group frame 310, a first lens group L 1, and a third decorative frame 303.
The first lens group frame 310 is disposed between the second rectilinear frame 120 and the second rotation frame 220. The first lens group frame 310 supports the first lens group L 1 for taking light into the lens barrel 20. The third decorative frame 303 is a cylindrical sheet metal member that covers the outer periphery of the first lens group frame 310.

4). Fixed barrel 24
The fixed barrel portion 24 includes a fixed frame 100, a fourth lens group frame 340, a fourth lens group L4, a zoom motor 241, a zoom gear 242, a focus motor 243, a master flange 244, an image sensor 245, and an image sensor flexible wiring 245a. .
The fixed frame 100 is a cylindrical resin member disposed on the radially outer side of the first rectilinear frame 110 and the first rotating frame 210. The fourth lens group frame 340 is attached to the master flange 244 and is driven in the optical axis direction by the focus motor 243. The fourth lens group frame 340 supports the fourth lens group L4 for focus adjustment.

The zoom motor 241 is a drive source for extending the first to third movable lens barrel portions 21 to 23, and is attached to the side surface of the fixed frame 100. The zoom gear 242 transmits the driving force of the zoom motor 241 to the first rotation frame 210. The front end of the zoom gear 242 is supported by the fixed frame 100, and the rear end of the zoom gear 242 is supported by the master flange 244. The focus motor 243 is a drive source for driving the fourth lens group frame 340 in the optical axis direction, and is attached to the master flange 244. The master flange 244 is a plate-like resin member that covers the rear of the fixed frame 100. The image sensor 245 is fitted in the center of the master flange 244. The imaging element flexible wiring 245a is attached to the rear surface of the master flange 244 in a state where the imaging element flexible wiring 245a is electrically connected to the imaging element 245. The imaging element flexible wiring 245a is connected to a control device (not shown) and transmits a signal from the imaging element 245.

<Configuration of each frame>
Below, the frame which comprises the lens-barrel 20 is demonstrated, referring drawings. Specifically, the fixed frame 100, the first rectilinear frame 110, the first rotating frame 210, the second rectilinear frame 120, the second rotating frame 220, the third rectilinear frame 130, the first lens group frame 310, and the second lens group. After sequentially describing the configuration of the frame 320, the third lens group frame 330, and the shutter frame 335, the engagement state between the frames will be described.

1. Configuration of Fixed Frame 100 FIG. 4 is a perspective view of the fixed frame 100.
The fixed frame 100 includes a fixed frame main body 101 and a zoom gear support portion 102.
The fixed frame main body 101 is formed in a cylindrical shape, and has an inner peripheral surface 100S and an outer peripheral surface 100T.
The zoom gear support portion 102 is provided so as to protrude from the outer peripheral surface 100T. The zoom gear support unit 102 rotatably supports the front end of the zoom gear 242. In the present embodiment, the zoom gear support portion 102 is covered with the front plate 11 and thus is not exposed to the outside of the housing 10 (see FIG. 1). Note that the tooth portion of the zoom gear 242 protrudes inside the fixed frame main body 101.

Further, the fixed frame 100 has five rectilinear grooves a1 and three cam grooves b1. However, in FIG. 4, three rectilinear grooves a1 and two cam grooves b1 are shown.
The five rectilinear grooves a1 are formed on the inner peripheral surface 100S along the optical axis direction, and are arranged at appropriate intervals in the circumferential direction.
The three cam grooves b1 are formed on the inner peripheral surface 100S so as to intersect the optical axis direction.

2. FIG. 5 is a perspective view of the first rectilinear frame 110.
The first rectilinear frame 110 includes a first rectilinear frame body 111, five rectilinear projections A1, three rectilinear grooves a2, a bayonet groove e1, and a bayonet projection E0.
The rectilinear frame main body 111 is formed in a cylindrical shape, and has an inner peripheral surface 110S and an outer peripheral surface 110T.

The five rectilinear protrusions A1 are erected on the rear end portion of the outer peripheral surface 110T. The five rectilinear protrusions A1 are engaged with the five rectilinear grooves a1 of the fixed frame 100.
The three rectilinear grooves a2 are formed on the inner peripheral surface 110S along the optical axis direction.
The bayonet groove e1 is formed in an arc shape along the circumferential direction at the rear end portion of the inner peripheral surface 110S. The bayonet groove e1 intersects with the three rectilinear grooves a2.

The bayonet protrusion E0 is disposed at the front end portion of the inner peripheral surface 110S. The bayonet protrusion E0 is formed in an arc shape along the circumferential direction. In the present embodiment, there are a plurality of bayonet protrusions E0 in the circumferential direction.

3. Configuration of First Rotating Frame 210 FIG. 6 is a perspective view of the first rotating frame 210.
The first rotating frame 210 includes a first rotating frame main body 211 and a gear portion 212.
The first rotating frame body 211 is formed in a cylindrical shape and has an inner peripheral surface 210S and an outer peripheral surface 210T.
The gear portion 212 is erected at the rear end portion of the outer peripheral surface 210T, and is formed along the circumferential direction. When the gear unit 212 is engaged with the zoom gear 242, the first rotating frame 210 is rotated in the circumferential direction by the driving force of the zoom motor 241. Although not shown, the gear portion 212 is located behind the rectilinear protrusion A1 of the first rectilinear frame 110.

The first rotating frame 210 has three cam followers B1, three bayonet protrusions E1, three cam grooves b2, a bayonet groove e0, and three rectilinear grooves a3. However, in FIG. 6, only one rectilinear groove a3 is shown.
The three cam followers B1 are erected at the rear end portion of the outer peripheral surface 210T. Two of the three cam followers B 1 are disposed at both ends of the gear portion 212. The three cam followers B1 are engaged with the three cam grooves b1 of the fixed frame 100.

The bayonet protrusion E1 is formed along the circumferential direction at the rear end portion of the outer peripheral surface 210T. The bayonet protrusion E1 is disposed in front of the gear portion 212. The bayonet protrusion E1 is engaged with the bayonet groove e1 of the first rectilinear frame 110. In the present embodiment, the bayonet protrusion E1 and the bayonet groove e1 constitute a bayonet mechanism for engaging the first rotating frame 210 with the first rectilinear frame 110 so as to be rotatable and integrated in the optical axis direction. .

The three cam grooves b2 penetrate the first rotating frame main body 211 from the inner peripheral surface 210S to the outer peripheral surface 210T.
The bayonet groove e0 is formed at the front end portion of the outer peripheral surface 210T. The bayonet groove e0 is formed in an arc shape along the circumferential direction. The bayonet groove e0 intersects with the three cam grooves b2. A bayonet protrusion E0 is engaged with the bayonet groove e0.

The three rectilinear grooves a3 are formed along the optical axis direction on the inner peripheral surface 210S. Two of the three rectilinear grooves a3 are close to each other, and the other one is formed 120 ° to 180 ° apart.

4). Configuration of Second Rectilinear Frame 120 FIG. 7 is a perspective view of the second rectilinear frame 120.
The second rectilinear frame 120 includes a second rectilinear frame main body 121 and two locking portions 122.
The second rectilinear frame main body 121 is formed in a cylindrical shape, and has an inner peripheral surface 120S and an outer peripheral surface 120T.
The two locking portions 122 are erected on the rear end surface of the second rectilinear frame main body 121 and protrude rearward. Further, the two locking portions 122 are formed at substantially symmetrical positions around the optical axis AX (see FIG. 3), that is, at positions 120 ° to 180 ° apart. As will be described later, when the two locking portions 122 are locked to the third rectilinear frame 130, relative rotation of the third rectilinear frame 130 with respect to the second rectilinear frame 120 is suppressed. In the present embodiment, one of the two locking portions 122 is formed longer in the circumferential direction than the other.

The second rectilinear frame 120 includes three rectilinear cam followers AB2, three rectilinear grooves a4, and a bayonet groove e2.
The three rectilinear cam followers AB2 are erected at the rear end portion of the outer peripheral surface 120T, and are arranged at substantially equal pitches in the circumferential direction. The three rectilinear cam followers AB2 are engaged with the three cam grooves b2 of the first rotating frame 210. The three rectilinear cam followers AB2 are inserted into the three cam grooves b2 and engaged with the three rectilinear grooves a2 of the first rectilinear frame 110.

The three rectilinear grooves a4 are formed on the inner peripheral surface 120S along the optical axis direction. The three rectilinear grooves a4 are arranged at a substantially equal pitch in the circumferential direction.
The bayonet groove e2 is formed at the rear end portion of the inner peripheral surface 120S along the circumferential direction. The bayonet groove e2 intersects with the three rectilinear grooves a4.

5. Configuration of Second Rotating Frame 220 FIG. 8 is a perspective view of the second rotating frame 220.
The second rotating frame 220 includes a second rotating frame main body 221, three rectilinear protrusions A3, three bayonet protrusions E2, two bayonet grooves e3, three cam grooves b3, and three cam grooves. b4, three cam grooves b5, and three cam followers B6. However, in FIG. 8, two cam grooves b3, cam grooves b4, and cam grooves b5 are shown.
The second rotary frame main body 221 is formed in a cylindrical shape and has an inner peripheral surface 220S and an outer peripheral surface 220T.

The three rectilinear protrusions A3 are erected at the rear end portion of the outer peripheral surface 220T, and two of the three rectilinear protrusions A3 are close to each other in the circumferential direction, and the other one is substantially from the two adjacent rectilinear protrusions A3. Formed 120 ° or more apart. The three rectilinear protrusions A3 are engaged with the three rectilinear grooves a3 of the first rotating frame 210.
The three bayonet protrusions E2 are formed along the circumferential direction at the rear end portion of the outer peripheral surface 220T. The three bayonet protrusions E2 are disposed in front of the three rectilinear protrusions A3. The bayonet protrusion E2 is engaged with the bayonet groove e2 of the second rectilinear frame 120. In the present embodiment, the bayonet protrusion E2 and the bayonet groove e2 constitute a bayonet mechanism for engaging the second rotary frame 220 with the second rectilinear frame 120 so as to be rotatable and integrated in the optical axis direction. .

The two bayonet grooves e3 have a trapezoidal shape with a short radial outer side and a long radial inner side in a cross section including the optical axis, and the inner circumferential surface 220S of the inner circumferential surface 220S is formed along the circumferential direction. It is formed in a substantially central part. The two bayonet grooves e3 are formed in parallel to each other. The two bayonet grooves e3 intersect with the cam groove b4 and the cam groove b5. The shape of the bayonet groove e3 in the cross section including the optical axis is a trapezoidal shape in which the radially outer side is short and the radially inner side is long. This is for narrowing the groove width of the bayonet groove e3 while maintaining the strength of the bayonet protrusion E3 engaged with the bayonet groove e3. Thereby, the shape in the cross section containing the optical axis of the bayonet protrusion E3 can also be made into a trapezoidal shape in which the radially outer side is short and the radially inner side is long. That is, the bayonet protrusion E3 can have a shape with a thick root and a thin tip, and a decrease in strength is small. Further, the width of the bayonet groove e3 that crosses the cam groove can also be narrowed on the radially outer side. For this reason, the missing area by the bayonet groove | channel e3 of the cam surface of a cam groove can also be reduced. As a result, the cam protrusion can pass smoothly.

The three cam grooves b3 are formed on the outer peripheral surface 220T so as to intersect the optical axis direction, and are arranged at substantially equal pitches in the circumferential direction.
The three cam grooves b4 and the three cam grooves b5 are formed on the inner peripheral surface 220S. The three cam grooves b4 and the three cam grooves b5 intersect each other. In the radial direction of the second rotary frame 220, the depth of the cam groove b4 is substantially the same as the depth of the cam groove b5. Further, in the radial direction of the second rotary frame 220, the depth of the bayonet groove e3 is shallower than the depth of the cam groove b5. Therefore, even if the cam groove b5 intersects with the bayonet groove e3, a portion deeper in the radial direction than the bayonet groove e3 in the cam projection B5 is always in contact with the cam surface, and therefore the cam groove b5 is not caught by the bayonet groove e3. . However, the bayonet groove e3 may be substantially the same as the cam groove b5. That is, the depth of the bayonet groove e3 may be equal to or less than the depth of the cam groove b5. When the depth of the bayonet groove e3 is substantially the same as the depth of the cam groove b5, the bayonet groove e3 is shifted from the cam groove b5 in the optical axis direction, and further three cam grooves b5 ′ are arranged. Three cam projections B5 ′ that engage with the cam groove b5 ′ are also arranged. Then, when the cam projection B5 is engaged with the intersection of the cam groove b5 with the bayonet groove e3, the cam groove b5 ′ and the cam projection B5 ′ are engaged with each other so that they are not caught. Thus, there is no problem even if the depth of the bayonet groove e3 is equal to or less than the depth of the cam groove b5.

The three cam followers B6 are erected at the front end portion of the outer peripheral surface 220T, and are arranged at a substantially equal pitch in the circumferential direction. However, in FIG. 8, only two cam followers B6 are shown.

6). Configuration of Third Rectilinear Frame 130 FIG. 9 is a perspective view of the third rectilinear frame 130.
The third rectilinear frame 130 includes a third rectilinear frame main body 131, a flange portion 132, and two locking recesses 133.
The third rectilinear frame main body 131 is formed in a cylindrical shape and has an inner peripheral surface 130S and an outer peripheral surface 130T.
The flange portion 132 is formed in an annular shape and is erected on the rear end portion of the outer peripheral surface 130T.

The two locking recesses 133 are notches formed on the outer edge of the flange portion 132. The two locking recesses 133 are formed at substantially symmetrical positions around the optical axis AX (see FIG. 3), that is, at positions 120 ° to 180 ° apart. Here, FIG. 10 is a schematic diagram showing a state in which the second rectilinear frame 120, the second rotary frame 220, and the third rectilinear frame 130 are assembled. As shown in FIG. 10, the second rectilinear frame of the third rectilinear frame 130 is obtained by the two engaging portions 122 of the second rectilinear frame 120 being engaged with the two engaging recesses 133 of the third rectilinear frame 130. Relative rotation with respect to 120 is suppressed. Note that one of the two locking recesses 133 is formed longer in the circumferential direction than the other, corresponding to one of the two locking portions 122 being formed longer in the circumferential direction than the other. Thereby, the strength of the two locking recesses 133 is improved.

The third rectilinear frame 130 includes three bayonet protrusions E3, three rectilinear grooves a5, and three rectilinear grooves a6. However, in FIG. 9, only two bayonet protrusions E3 are shown.
The three bayonet protrusions E3 are formed along the circumferential direction at a substantially central portion of the outer peripheral surface 130T. The two bayonet protrusions E3 are formed in parallel to each other. The two bayonet protrusions E3 are engaged with the two bayonet grooves e3 of the second rotation frame 220. In the present embodiment, the bayonet protrusion E3 and the bayonet groove e3 constitute a bayonet mechanism for rotatably engaging the third rectilinear frame 130 with the second rotary frame 220 and integrally engaging in the optical axis direction. is doing. The positional relationship between the bayonet protrusion E3 and the cam groove b4 of the second rotating frame 220 will be described later.

The three rectilinear grooves a5 penetrate the third rectilinear frame main body 131 from the inner peripheral surface 130S to the outer peripheral surface 130T. The three rectilinear grooves a5 extend along the optical axis direction and are arranged at substantially equal pitches in the circumferential direction.
The three rectilinear grooves a6 penetrate the third rectilinear frame main body 131 from the inner peripheral surface 130S to the outer peripheral surface 130T. The three rectilinear grooves a6 extend along the optical axis direction and are arranged at substantially equal pitches in the circumferential direction.
In the present embodiment, the three rectilinear grooves a5 and the three rectilinear grooves a6 are alternately arranged in the circumferential direction.

7). Configuration of First Lens Group Frame 310 FIG. 11 is a perspective view of the first lens group frame 310.
The first lens group frame 310 includes a first lens group frame main body 311, three rectilinear projections A4, and three cam projections B3.

The first lens group frame body 311 is formed in a cylindrical shape, and has an inner peripheral surface 310S and an outer peripheral surface 310T. The first lens group frame main body 311 is formed with three projecting portions 311a projecting rearward.
The three rectilinear protrusions A4 are erected on the outer peripheral surface 310T of the protruding portion 311a, and are arranged at a substantially equal pitch in the circumferential direction. The three rectilinear protrusions A4 are engaged with the three rectilinear grooves a4 of the second rectilinear frame 120.

The three cam protrusions B3 are erected on the inner peripheral surface 310S of the protruding portion 311a, and are arranged at a substantially equal pitch in the circumferential direction. The three cam protrusions B3 are engaged with the three cam grooves b3 of the second rotating frame 220.
In the present embodiment, the three rectilinear protrusions A4 and the three cam protrusions B3 are disposed substantially opposite to each other with the protrusion 311a interposed therebetween.

8). Configuration of Second Lens Group Frame 320 FIG. 12 is a perspective view of the second lens group frame 320.
The second lens group frame 320 includes a second lens group frame main body 321, three rectilinear projections A5, and three cam projections B4.
The second lens group frame main body 321 is formed in a cup shape and has an outer peripheral surface 320T.

The three rectilinear protrusions A5 are formed on the rear end portion of the outer peripheral surface 320T, and are arranged at a substantially equal pitch in the circumferential direction. The three rectilinear protrusions A5 are engaged with the three rectilinear grooves a5 of the third rectilinear frame 130.
The three cam protrusions B4 are formed on the three rectilinear protrusions A5. The three cam protrusions B4 are engaged with the three cam grooves b4 of the second rotating frame 220.

9. Configuration of Third Lens Group Frame 330 FIG. 13 shows a state in which the third lens group frame 330 is housed inside the shutter frame 335. The configuration of the third lens group frame 330 will be described with reference to FIG.
The third lens group frame 330, that is, an OIS (Optical Image Stabilizer) unit mainly includes an OIS frame 400, a retractable lens frame 401, and a third lens group L3 for image blur correction.

The OIS frame 400 is attached to the shutter frame 335. Specifically, the OIS frame 400 is movable in a plane perpendicular to the optical axis. More specifically, a magnet (not shown) is fixed to the OIS frame 400, and a coil (not shown) is fixed to the shutter frame 335 at a position facing the magnet. In this state, when electric power is supplied from a camera circuit (not shown) to the coil of the shutter frame, a current flows through the coil to generate a magnetic field. The magnetic field drives the magnet of the OIS frame 400, and the driving force moves the OIS frame 400 in a plane perpendicular to the optical axis.

The retraction lens frame 401 is held by the OIS frame 400 so as to be movable around a retraction axis substantially parallel to the optical axis. The retractable lens frame 401 moves from a correctable position (first posture) where the third lens unit L3 can perform image blur correction to a retracted position (second posture) where the third lens unit L3 is retracted from the optical axis. Its position can be changed. The retractable lens frame 401 holds a third lens unit L3 including at least one lens.

10. Configuration of Shutter Frame 335 Next, the configuration of the shutter frame 335 will be described with reference to FIG.
The shutter frame 335 includes a shutter frame main body 336, three rectilinear protrusions A6, and three cam protrusions B5.
The shutter frame body 336 is formed in a cylindrical shape and has an outer peripheral surface 335T.
The three rectilinear protrusions A6 are formed on the outer peripheral surface 335T, and are arranged at a substantially equal pitch in the circumferential direction. The three rectilinear protrusions A6 are engaged with the three rectilinear grooves a6 of the third rectilinear frame 130.
The three cam protrusions B5 are erected on the front end portions of the three rectilinear protrusions A6. The three cam protrusions B5 are engaged with the three cam grooves b5 of the second rotating frame 220.

11. Next, the positional relationship between the bayonet protrusion E3 of the third rectilinear frame 130 and the cam groove b4 of the second rotating frame 220 will be described with reference to the drawings. FIG. 14 is a development view of the inner peripheral surface 220 S of the second rotating frame 220. FIG. 15 is a development view of the outer peripheral surface 130 T of the third rectilinear frame 130. FIG. 16 is a schematic diagram for explaining the positional relationship between the bayonet protrusion E3 and the cam groove b4.

As shown in FIG. 14, two bayonet grooves e3, three cam grooves b4, and three cam grooves b5 are formed on the inner peripheral surface 220T of the second rotating frame 220. The two bayonet grooves e3 are linearly formed along the circumferential direction. The two bayonet grooves e3 intersect the three cam grooves b4 and the three cam grooves b5. The two bayonet grooves e3 include a first bayonet groove e31 and a second bayonet groove e32. The first bayonet groove e31 is formed in front of the second bayonet groove e32. As described above, the depths of the first and second bayonet grooves e31 and e32 are not more than the depth of the cam groove b4.

As shown in FIG. 15, three bayonet protrusions E 3 are formed on the outer peripheral surface 130 T of the third rectilinear frame 130. The bayonet protrusion E3 includes a first bayonet protrusion E31 and a second bayonet protrusion E32. The first bayonet protrusion E31 is formed in front of the second bayonet protrusion E32.
The first bayonet protrusion E31 and the second bayonet protrusion E32 are disposed substantially parallel to each other at a predetermined interval in the optical axis direction at substantially the same position in the circumferential direction. The reason why the first bayonet protrusion E31 and the second bayonet protrusion E32 are in substantially the same position in the circumferential direction is as follows. When the lens barrel 20 is assembled, a portion through which the bayonet protrusion of the second rotary frame 220 passes when the third rectilinear frame 130 is inserted into the second rotary frame 220 from the rear side in the optical axis direction. It is necessary to reduce the wall thickness. Therefore, if the first bayonet protrusion E31 and the second bayonet protrusion E32 are at different positions in the circumferential direction, the number of portions that reduce the thickness increases. That is, the strength of the second rotating frame 220 is reduced. Further, when the thin portion and the cam groove overlap, the cam surface depth of the cam groove is reduced, and the cam protrusion is easily detached.

In order to avoid these problems, the first bayonet protrusion E31 and the second bayonet protrusion E32 are arranged at substantially the same position in the circumferential direction. In the present disclosure, there are three portions F1 (FIGS. 14 and 16) for reducing the wall thickness for incorporating the bayonet protrusion E32. Moreover, since the three rectilinear grooves a5 and the three rectilinear grooves a6 exist as holes in the third rectilinear frame 130, the space for arranging the bayonet protrusions on the outer peripheral side is narrow.

In the present disclosure example, the first bayonet protrusion E31 and the second bayonet protrusion E32 are arranged in a narrow width between the hole of the rectilinear groove a5 and the hole of the rectilinear groove a6 because they are at substantially the same position in the circumferential direction. Even if it is, it can solve said subject.
As shown in FIG. 16, the first bayonet protrusion E31 is movable along the circumferential direction in the first bayonet groove e31. Similarly, the second bayonet protrusion E32 is movable along the circumferential direction in the second bayonet groove e32. As a result, the third rectilinear frame 130 surrounds the second rotating frame 220 between the first bayonet protrusion E31 and the second bayonet protrusion E32 and the flange portion 132 that is the rear end portion of the third rectilinear frame 130. It is supported so as to be rotatable in the direction and immovable in the optical axis direction.

Here, in the circumferential direction, the width Y1 of the first bayonet protrusion E31 is equal to or less than the width y1 of the cam groove b4. Therefore, when the first bayonet protrusion E31 is positioned in the cam groove b4, the engagement of the first bayonet protrusion E31 with the first bayonet groove e31 is temporarily released. On the other hand, when the first bayonet protrusion E31 is located in the vicinity of the cam groove b4 (including the inside of the cam groove b4), the second bayonet protrusion E32 is engaged with the second bayonet groove e32.

In the circumferential direction, the width Y2 of the second bayonet protrusion E32 is equal to or smaller than the width y2 of the cam groove b4. Therefore, when the second bayonet protrusion E32 is positioned in the cam groove b4, the engagement of the second bayonet protrusion E32 with the second bayonet groove e32 is temporarily released. On the other hand, when the second bayonet protrusion E32 is positioned in the vicinity of the cam groove b4 (including the inside of the cam groove b4), the first bayonet protrusion E31 is engaged with the first bayonet groove e31.

Thus, when all the 1st bayonet protrusion E31 is located in the cam groove b4, at least one part of the 2nd bayonet protrusion E32 is engaged with the 2nd bayonet groove | channel e32. Further, when all of the second bayonet protrusions E32 are located in the cam groove b4, at least a part of the first bayonet protrusion E31 is the first bayonet groove e31.
12 Engagement of Frames FIGS. 17 to 19 are sectional views of the lens barrel 20. 17 to 19 are schematic diagrams in which a plurality of cut surfaces passing through the optical axis AX are combined. 17 shows the retracted state of the lens barrel 20, FIG. 18 shows the wide state of the lens barrel 20, and FIG. 19 shows the tele state of the lens barrel 20. In the present embodiment, the shootable state of the digital camera 1 means the state of the lens barrel 20 from the wide state to the tele state.

The gear portion 212 of the first rotating frame 210 is meshed with the zoom gear 242 (not shown). The cam follower B1 of the first rotating frame 210 is engaged with the cam groove b1 of the fixed frame 100. Therefore, the first rotating frame 210 can move in the optical axis direction while rotating in the circumferential direction by the driving force of the zoom motor 241.
The rectilinear projection A1 of the first rectilinear frame 110 is engaged with the rectilinear groove a1 of the fixed frame 100. The bayonet protrusion E1 of the first rotating frame 210 is engaged with the bayonet groove e1 of the first rectilinear frame 110. Therefore, the first rectilinear frame 110 can go straight in the optical axis direction together with the first rotating frame 210.

The rectilinear cam follower AB2 of the second rectilinear frame 120 is inserted into the cam groove b2 of the first rotating frame 210 and is engaged with the rectilinear groove a2 of the first rectilinear frame 110. Therefore, the second rectilinear frame 120 can go straight in the optical axis direction according to the rotation of the first rotating frame 210.
The rectilinear protrusion A3 of the second rotating frame 220 is engaged with the rectilinear groove a3 of the first rotating frame 210. Further, the bayonet protrusion E 2 of the second rotating frame 220 is engaged with the bayonet groove e 2 of the second rectilinear frame 120. Therefore, the second rotating frame 220 is movable in the optical axis direction together with the second rectilinear frame 120 while rotating in the circumferential direction together with the first rotating frame 210.

The locking portion 122 of the second rectilinear frame 120 is locked to the locking recess 133 of the third rectilinear frame 130. Further, the bayonet protrusion E3 of the third rectilinear frame 130 is engaged with the bayonet groove e3 of the second rotary frame 220. Of the intervals between the three rectilinear protrusions A3 of the second rotary frame 220, at least two intervals are arranged at a distance of approximately 120 ° or more, and the interval between the two locking portions 122 of the second rectilinear frame 120 is also approximately 120 °. They are arranged apart from each other, and their relative rotation angles during zoom driving are set to approximately 120 ° or less. Therefore, the locking portion 122 and the rectilinear protrusion A3 are disposed at the same position in the radial direction and the optical axis direction, but are disposed at different positions in the rotation angle direction, that is, the circumferential direction. As a result, the third rectilinear frame 130 can go straight in the optical axis direction together with the second rectilinear frame 120 without interfering with the rotation of the second rotary frame 220.

Corresponding to one of the two locking portions 122 being longer in the circumferential direction than the other, one of the two locking recesses 133 is formed longer in the circumferential direction than the other. It is desirable that the rectilinear frame 130 be elongated in the circumferential direction as long as it does not interfere with the rotation of the second rotating frame 220.
In addition, at least two intervals among the three rectilinear protrusions A3 of the second rotation frame 220 are approximately 150 °, and the interval between the two locking portions 122 of the second rectilinear frame 120 is also approximately 150 °. The relative rotation angle of each other during zoom driving is set to approximately 150 ° or less. Therefore, the third rectilinear frame 130 does not interfere with the rotation of the second rotating frame 220. The same applies to other angles.

The rectilinear projection A4 of the first lens group frame 310 is engaged with the rectilinear groove a4 of the second rectilinear frame 120. Further, the cam protrusion B3 of the first lens group frame 310 is engaged with the cam groove b3 of the second rotation frame 220. Therefore, the first lens group frame 310 can go straight in the optical axis direction according to the rotation of the second rotation frame 220.
The cam b6 of the first lens group frame 310 is engaged with the cam follower B6 of the second rotation frame 220. The first lens group frame 310 and the second rotation frame 220 are engaged by two cam mechanisms including a cam follower B3 that engages with the cam groove b3 and a cam follower B6 that engages with the cam b6. By doing so, the frame is prevented from being broken or detached due to an external force applied from the subject side in the optical axis direction due to dropping or the like.

The rectilinear protrusion A5 of the second lens group frame 320 is engaged with the rectilinear groove a5 of the third rectilinear frame 130. Further, the cam protrusion B4 of the second lens group frame 320 is engaged with the cam groove b4 of the second rotation frame 220. Therefore, the second lens group frame 320 can go straight in the optical axis direction according to the rotation of the second rotation frame 220.
The rectilinear protrusion A6 of the shutter frame 335 is engaged with the rectilinear groove a6 of the third rectilinear frame 130. Further, the cam projection B5 of the shutter frame 335 is engaged with the cam groove b5 of the second rotation frame 220. Therefore, the shutter frame 335 can go straight in the optical axis direction in accordance with the rotation of the second rotation frame 220.

A third lens group frame 330 is attached to the shutter frame 335, and when the shutter frame 335 moves straight in the optical axis direction with respect to the third rectilinear frame 130, the retractable lens frame 401 of the third lens group frame 330 is It is rotated by a retracting mechanism (not shown). As a result, when shifting from the retracted state to the photographing enabled state, the retractable lens frame 401 moves from the retracted position to the correctable position. Further, when shifting from the photographing enabled state to the retracted state, the retractable lens frame 401 moves from the correctable position to the retracted position. When the retractable lens frame 401 is disposed at the correctable position, the third lens unit L3 is movable in a plane perpendicular to the optical axis. That is, in this state, image blur correction can be performed.

As described above, the first to third rectilinear frames 110 to 130 and the lens group frames 310, 320, and 335 move straight by the rotation of the first rotating frame 210 and the second rotating frame 220 by the driving force of the zoom motor 241. It has been realized.

<Assembly method of lens barrel 20>
Hereinafter, a method for assembling the lens barrel 20 will be described.
First, the third rectilinear frame 130 is inserted from the rear of the second rotating frame 220. Subsequently, the third rectilinear frame 130 is rotated in the circumferential direction to be in the tele state.
Next, the second lens group frame 320 is inserted from the rear of the third rectilinear frame 130.
Next, the retractable lens frame 401 is inserted from the front of the OIS frame 400, and the retractable lens frame 401 is rotatably attached to the OIS frame 400.

Next, the OIS frame 400 is inserted from the front of the shutter frame 335.
Next, the shutter frame 335 is inserted from the rear of the third rectilinear frame 130.
Subsequently, the second rotating frame 220 is rotated in the circumferential direction to be in a retracted state.
Next, the second rotating frame 220 is inserted from the rear of the first lens group frame 310.
Next, the second rectilinear frame 120 is covered from the front of the first lens group frame 310.

Next, the first rotating frame 210 is inserted from the rear of the first rectilinear frame 110. Subsequently, the second rectilinear frame 120 is inserted from the rear of the first rotating frame 210.
Next, the first rectilinear frame 110 is inserted from the rear of the fixed frame 100.
Finally, the first rotating frame 210 is rotated with respect to the fixed frame 100 to be in the retracted state.

<Action and effect>
(1) The lens barrel 20 includes a second rotating frame 220 (first frame) having first and second bayonet grooves e31 and e32 and a cam groove b4 intersecting with the first and second bayonet grooves e31 and e32. And a third rectilinear frame 130 (an example of a second frame) having first and second bayonet protrusions E31, E32 engaged with the first and second bayonet grooves e31, e32. When the first bayonet protrusion E31 is positioned in the vicinity of the cam groove b4, the second bayonet protrusion E32 is engaged with the second bayonet groove e32. When the second bayonet protrusion E32 is positioned near the cam groove b4, the first bayonet protrusion E31 is engaged with the first bayonet groove e31.

Here, the depth of the first bayonet groove e31 is equal to or less than the depth of the cam groove b4. Further, the width Y1 of the first bayonet protrusion E31 is equal to or smaller than the width y1 of the cam groove b4. For this reason, if the second bayonet protrusion E32 does not exist, the engagement between the second rotary frame 220 and the third rectilinear frame 130 may be disengaged when the first bayonet protrusion E31 is located in the cam groove b4. is there. However, in such a case, in the lens barrel 20, since the second bayonet protrusion E32 is engaged with the second bayonet groove e32, the second rotary frame 220 and the third rectilinear frame 130 are engaged. Can be maintained.

Similarly, the depth of the second bayonet groove e32 is equal to or less than the depth of the cam groove b4. Further, the width Y2 of the second bayonet protrusion E32 is equal to or less than the width y2 of the cam groove b4. Therefore, if the first bayonet protrusion E31 does not exist, the second rotary frame 220 and the third rectilinear frame 130 may be disengaged when the second bayonet protrusion E32 is positioned in the cam groove b4. is there. However, in the lens barrel 20, in such a case, since the first bayonet protrusion E31 is engaged with the first bayonet groove e31, the second rotary frame 220 and the third rectilinear frame 130 are engaged. Can be maintained.
In addition, since the depth of the 1st and 2nd bayonet groove | channels e31 and e32 is made into the depth of the cam groove b4, compared with the case where a bayonet groove | channel is deeper than a cam groove, the thickness of the 2nd rotation frame 220 is made. Can be small. Accordingly, the size of the lens barrel 20 in the radial direction can be reduced.

(2) When all of the first bayonet protrusions E31 are located in the cam groove b4, at least a part of the second bayonet protrusion E32 engages with the second bayonet groove e32. When all of the second bayonet protrusions E32 are located in the cam groove b4, at least a part of the first bayonet protrusion E31 forms the first bayonet groove e31. Thereby, even if the width Y1 of the first bayonet protrusion E31 and the width Y2 of the second bayonet protrusion E32 are equal to or less than the widths y1 and y2 of the cam groove b4, the relationship between the second rotary frame 220 and the third rectilinear frame 130 is obtained. Can be maintained well.

(3) The 1st bayonet protrusion E31 and the 2nd bayonet protrusion E32 are arrange | positioned at predetermined intervals in the optical axis direction. Thus, by providing the two first bayonet protrusions E31 and the second bayonet protrusion E32, the coupling strength in the optical axis direction of the second rotary frame 200 with respect to the third rectilinear frame 13 can be increased.
(4) The lens barrel 20 further includes an image sensor 245. The third rectilinear frame 130 can rotate the second rotating frame 220 in the circumferential direction between the first bayonet protrusion E31 and the second bayonet protrusion E32 and the rear end portion (flange portion) of the third rectilinear frame 130. And it supports so that an optical axis direction cannot move. Accordingly, the second rotation frame 220 is held at the rear end portions of the first bayonet protrusion E31 and the third rectilinear frame 130, and the second rotation frame 220 is retained at the rear end portions of the second bayonet protrusion E32 and the third rectilinear frame 130. Can be held. As a result, the second rotary frame 200 can be more reliably held with respect to the third rectilinear frame 13.

<Other embodiments>
(A) In the above-described embodiment, the lens barrel 20 is a three-stage retractable type including the first rectilinear frame 110, the second rectilinear frame 120, and the first lens group frame 310. is not. The lens barrel 20 may be a two-stage collapsible type including a first rectilinear frame 110 and a second rectilinear frame 120. In this case, the lens barrel 20 may not include the second rotating frame 220 and the third rectilinear frame 130. Furthermore, the lens barrel 20 may be a retractable type having four or more stages.

(B) In the above embodiment, the cam groove b is formed in one of the two frames and the cam protrusion B is formed in the other frame, but the present invention is not limited to this. The cam projection B may be formed on one of the two frames, and the cam groove b may be formed on the other frame. Moreover, the cam groove b and the cam protrusion B may be formed in each of the two frames.
(C) In the above embodiment, the rectilinear groove a is formed in one of the two frames and the rectilinear protrusion A is formed in the other frame, but the present invention is not limited to this. The rectilinear protrusion A may be formed on one of the two frames, and the rectilinear groove a may be formed on the other frame. Moreover, the rectilinear advance groove | channel a and the rectilinear advance protrusion A may be formed in each of two frames.

(D) In the above embodiment, the bayonet groove e is formed in one of the two frames and the bayonet protrusion E is formed in the other frame, but this is not restrictive. The bayonet protrusion E may be formed in one of the two frames, and the bayonet groove e may be formed in the other frame. Moreover, the bayonet groove | channel e and the bayonet protrusion E may be formed in each of two frames.

(E) In the above embodiment, the third lens group frame 330 is retracted to the side of the second lens group frame 320 in the retracted state, but the present invention is not limited to this. The third lens group frame 330 may be disposed behind the second lens group frame 320 in the retracted state.
(F) In the above embodiment, the positional relationship between the bayonet protrusion E3 and the cam groove b4 has been described focusing on the engagement between the third rectilinear frame 130 and the second rotating frame 220. However, the present invention is not limited to this. Absent. The combination of the bayonet protrusion and the cam groove having the positional relationship described above can be applied to two frames that are engaged via the bayonet mechanism.

(G) In the above embodiment, the bayonet protrusion E3 is formed on the outer peripheral surface 130T of the third rectilinear frame 130, and the bayonet groove e3 and the cam groove b4 are formed on the inner peripheral surface 220S of the second rotating frame 220. However, it is not limited to this. The bayonet groove e3 and the cam groove b4 may be formed on the outer peripheral surface 130T of the third rectilinear frame 130, and the bayonet protrusion E3 may be formed on the inner peripheral surface 220S of the second rotary frame 220.

(H) Although the bayonet protrusion E3 includes the first and second bayonet protrusions E31 and E32 in the above embodiment, the present invention is not limited to this. The bayonet protrusion E3 may include three or more bayonet protrusions.
(I) In the above embodiment, the first and second bayonet protrusions E31 and E32 are opposed to each other in the optical axis direction. However, the present invention is not limited to this. The first and second bayonet protrusions E31 and E32 may be arranged at positions shifted from each other in the circumferential direction.

(J) In the above embodiment, in the circumferential direction of the third rectilinear frame 130, the widths Y1 and Y2 of the first and second bayonet protrusions E31 and E32 are less than or equal to the width y1 of the cam groove b4. It is not limited to. The widths Y1 and Y2 of the first and second bayonet protrusions E31 and E32 may be equal to or larger than the width y1 of the cam groove b4. When the first and second bayonet protrusions E31 and E32 pass near the cam groove b4, it is preferable that there is the other bayonet protrusion because the coupling strength between the two is reduced even if it does not come off.

According to the technology disclosed herein, a lens barrel that can be made compact can be provided, and can be applied to, for example, a camera, a mobile phone with a camera, a portable terminal with a camera, and the like.

DESCRIPTION OF SYMBOLS 1 ... Digital camera 10 ... Case 20 ... Lens barrel 21 ... 1st moving barrel part 22 ... 2nd moving barrel part 23 ... 3rd moving barrel part 24 ... Fixed barrel part 100 ... Fixed frame 110 ... 1st 1st rectilinear frame 120 ... 2nd rectilinear frame 122 ... locking part 130 ... 3rd rectilinear frame 133 ... locking recess 210 ... 1st rotating frame 212 ... gear part 220 ... 2nd rotating frame 241 ... zoom motor 242 ... zoom gear 310 ... First lens group frame 320 ... Second lens group frame 330 ... Third lens group frame 335 ... Shutter frames a1 to a6 ... Straight advance grooves A1, A3 to A6 ... Straight advance projections b1 to b5 ... Cam grooves B1, B3 to B5 ... Cam followers AB2 ... Straight-forward cam follower e1 to e3 ... Bayonet groove E1 to E3 ... Bayonet protrusion

Claims

A first frame having first and second bayonet grooves and at least one cam groove intersecting the first and second bayonet grooves;
A second frame having first and second bayonet protrusions engaged with the first and second bayonet grooves;
With
In the radial direction of the first frame, the depth of the first and second bayonet grooves is equal to or less than the depth of the cam grooves,
In the circumferential direction of the first frame, the width of the first and second bayonet protrusions is equal to or less than the width of the cam groove,
When the first bayonet protrusion is positioned near the cam groove, the second bayonet protrusion is engaged with the second bayonet groove;
When the second bayonet protrusion is positioned near the cam groove, the first bayonet protrusion is engaged with the first bayonet groove;
Lens barrel.
When at least a part of the first bayonet protrusion is located in the cam groove, at least a part of the second bayonet protrusion is engaged with the second bayonet groove;
When at least a part of the second bayonet protrusion is located in the cam groove, at least a part of the first bayonet protrusion is engaged with the first bayonet groove;
The lens barrel according to claim 1.
The first and second bayonet protrusions are arranged at a predetermined interval in the optical axis direction.
The lens barrel according to claim 1 or 2.
It further includes an image sensor,
The second frame is rotatable between the first and second bayonet protrusions and a flange portion formed on the imaging element side in the second frame, and is rotatable in the circumferential direction. Supporting axially immovable,
The lens barrel according to any one of claims 1 to 3.