JP2012247719A - Lens barrel and camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel and a camera having guide shaft arrangement that does not hinder miniaturization thereof and also suppresses an influence of light leakage.SOLUTION: A lens barrel includes a first barrel (15) and a second barrel (16) moving back and forth in the optical axis direction, and a guide shaft (52) disposed between the first barrel (15) and the second barrel (16) for rectilinearly guiding a lens group.

Description

  The present invention relates to a lens barrel and a camera.

  In recent years, it has been desired to reduce the size and thickness of lens barrels. In order to reduce the size, there is a lens barrel in which a rectilinear guide shaft that guides the rectilinear movement of the lens group is disposed inside the barrel (for example, see Patent Document 1).

JP 2006-215421 A

  However, conventionally, a hole for passing the guide shaft is provided in the lens holding frame that holds the lens group in order to arrange the linear guide shaft inside the lens barrel while maintaining the size reduction. For this reason, light may enter from the hole during photographing, which may adversely affect the photographed image.

  An object of the present invention is to provide a lens barrel and a camera having a guide shaft arrangement which does not hinder downsizing and has little influence of light leakage.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

According to the first aspect of the present invention, the first cylinder (15) and the second cylinder (16) moving forward and backward in the optical axis direction, the first cylinder (15), and the second cylinder (16) And a guide shaft (52) that guides the lens group in a straight line and has a lens barrel (10).
The invention according to claim 2 is the lens barrel (10) according to claim 1, wherein the first tube (15) and the second tube (16) are adjacent to each other. This is a lens barrel (10).
The invention described in claim 3 is the lens barrel (10) according to claim 2, wherein one of the first cylinder (15) and the second cylinder (16) is a rotating cylinder (15). The lens barrel (10) is characterized in that the other is a rectilinear barrel (16).
A fourth aspect of the present invention is the lens barrel (10) according to the third aspect, wherein the rectilinear cylinder (16) is disposed inside the rotating cylinder (15). This is a lens barrel (10).
Invention of Claim 5 is a lens-barrel (10) of any one of Claims 1-4, Comprising: Said 1st pipe | tube (15) and said 2nd pipe | tube (16) Is a lens barrel (10) characterized by moving integrally in the optical axis direction.
The invention described in claim 6 is the lens barrel (10) according to any one of claims 1 to 5, wherein the first cylinder (15) and the second cylinder (16). The lens barrel (10) is characterized in that a light shielding part (16G) is formed at one end.
The invention according to claim 7 is the lens barrel (10) according to claim 6, wherein the light shielding portion (16G) is provided in a flange shape projecting from the end portion to the other tube side. A lens barrel (10).
Invention of Claim 8 is a lens-barrel (10) of any one of Claims 1-7, Comprising: The said guide shaft (52) is the cylinder (16) arrange | positioned inside. A concave portion (16D) recessed toward the inner peripheral side extending in the optical axis direction is formed in a part of the side surface of the guide shaft, and the guide shaft (52) is disposed in the concave portion (16D). A lens barrel (10).
The invention described in claim 9 is a camera (1) including the lens barrel (10) according to any one of claims 1 to 8.
Note that the configuration described with reference numerals may be modified as appropriate, and at least a part of the configuration may be replaced with another component.

  According to the present invention, it is possible to provide a lens barrel and a camera having a guide shaft arrangement that does not hinder downsizing and is less affected by light leakage.

It is a notional longitudinal cross-sectional view in the retracted state of a camera provided with the lens-barrel to which one Embodiment of this invention is applied. FIG. 2 is a view of a subject side seen from a plane orthogonal to the optical axis of the lens barrel along the line AA in FIG. 1. It is a conceptual longitudinal cross-sectional view in the imaging state in which the lens barrel is extended. FIG. 3 is a diagram extracting and showing a double-sided cam cylinder, a rectilinear guide cylinder, and a sub guide shaft from FIG. 2. It is a figure in the comparative example corresponded to FIG. FIG. 3 is a diagram in a comparative example corresponding to FIG. 2. FIG. 4 is a diagram in a comparative example corresponding to FIG. 3. It is the figure which looked at the to-be-photographed object side rather than the 3 group lens chamber in a comparative example.

Embodiments of the present invention will be described below with reference to the drawings.
Each drawing is provided with an XYZ orthogonal coordinate system for easy explanation and understanding. In this coordinate system, the direction toward the left side as viewed from the photographer at the position of the camera 1 when the photographer shoots a horizontally long image with the optical axis OA being horizontal (hereinafter referred to as a normal position) is defined as the X plus direction. Further, the direction toward the upper side in the normal position is defined as the Y plus direction. Further, the direction toward the subject at the normal position is defined as the Z plus direction. In the following description, unless otherwise specified, movement in a direction parallel to the optical axis OA in the imaging optical system is referred to as “straight forward”, and movement around the optical axis OA is referred to as “rotation”. In addition, the direction parallel to the optical axis OA in the imaging optical system is referred to as “front-rear”, the subject side is referred to as “front side”, and the other end side is referred to as “back side”.

  FIG. 1 is a conceptual longitudinal sectional view in a retracted state of a camera 1 including a lens barrel 10 to which an embodiment of the present invention is applied, and corresponds to a BB section in FIG. FIG. 2 is a view of the subject side seen from a plane orthogonal to the optical axis OA of the lens barrel 10 along the line AA in FIG. FIG. 3 is a conceptual longitudinal sectional view in a photographing state in which the lens barrel 10 is extended. FIG. 4 is a diagram showing the double-sided cam cylinder 15, the rectilinear guide cylinder 16, and the auxiliary guide shaft 52 extracted from FIG.

The camera 1 is a digital camera composed of a body part 2 and a lens barrel 10. The present invention is not limited to a digital camera, and can be applied to, for example, a still camera using a film.
The lens barrel 10 is in a retracted state in which the lens barrel 10 is retracted and accommodated in the body portion 2 as shown in FIG. 1 when the power is not turned on, and when the power is turned on, as shown in FIG. 2 protrudes to the front side and enters a shooting state.

The body part 2 includes a sensor unit 31 inside the body housing 2A.
The sensor unit 31 includes an image sensor 31A such as a CCD. The sensor unit 31 is provided in the body housing 2A so that the imaging surface of the imaging element 31A is orthogonal to the optical axis OA of the lens barrel 10. The sensor unit 31 converts an image formed on the imaging surface of the imaging element 31A by the lens barrel 10 into an electrical signal and outputs the electrical signal.

  The lens barrel 10 includes four lens groups (a first lens group L1, a second lens group L2, a third lens group L3, and a fourth lens group L4) that form an imaging optical system in the camera 1. ing. These lens groups (L 1, L 2, L 3, L 4) form a subject image on the imaging surface of the image sensor 31 A in the sensor unit 31. The fourth lens group L4 is a focusing lens group, and moves in the direction of the optical axis OA to change the imaging position.

  The camera 1 then captures the subject image light formed by the lens group (L1, L2, L3, L4) of the lens barrel 10 on the light receiving surface of the image sensor 31A by pressing the release button (not shown) by the photographer. The sensor unit 31 converts it into an electrical signal and records (photographs) the image information of the subject in a storage device (not shown). All the operation control in the camera 1 including the photographing is performed by a control device (not shown).

Next, the lens barrel 10 having a characteristic configuration in the present embodiment will be described in detail.
In the lens barrel 10, a cam barrel 12, an externally rectilinear barrel 13, a first group rectilinear barrel 14, a double-sided cam barrel 15, and a rectilinear guide barrel 16 are arranged in a nested multistage manner in which the diameter is gradually reduced. It is installed. On the inner peripheral side of the rectilinear guide tube 16, a second group lens chamber 17, a third group lens chamber 18, and a fourth group lens chamber 19 are provided in series in the direction of the optical axis OA.

  The first-group rectilinear cylinder 14 is the first lens group L1, the second-group lens chamber 17 is the second lens group L2, the third-group lens chamber 18 is the third lens group L3, and the fourth-group lens chamber 19 is the fourth lens group L4. Are held respectively. The third group lens chamber 18 holds a shutter unit 18S on the front side of the third lens group L3. The fourth lens group L4 held by the fourth group lens chamber 19 is a focusing lens group as described above, and is driven to move in the direction of the optical axis OA by the drive operation mechanism 40.

Hereinafter, each component in the lens barrel 10 will be described in order.
The fixed cylinder 11 is formed in a substantially cylindrical shape with a predetermined thickness, and constitutes an outer surface of the lens barrel 10 and also serves as an inner frame of the body portion 2. A sensor unit base 30 including a sensor unit 31 is attached to the end of the fixed cylinder 11 on the back side.
Further, a motor support portion 11 </ b> A is formed at the rear side end of the fixed cylinder 11. A drive motor 41 in a drive operation mechanism 40 to be described later is attached to the motor support portion 11A.
A helicoid groove 11 </ b> B is formed on the inner periphery of the fixed cylinder 11. The helicoid groove 11B is formed in a spiral shape whose position in the optical axis OA direction changes in the circumferential direction.

  The cam cylinder 12 has a cylindrical shape with a predetermined thickness and is located on the inner peripheral side of the fixed cylinder 11. A helicoid pin 12A protrudes from the outer periphery of the cam cylinder 12, and the helicoid pin 12A is fitted in the helicoid groove 11B of the fixed cylinder 11 so as to be slidable. The cam cylinder 12 is rotationally driven by a feeding motor (not shown), and by the rotation, the cam cylinder 12 moves in the optical axis OA direction according to the displacement of the helicoid groove 11B in the optical axis OA direction. That is, the cam cylinder 12 goes straight while rotating.

  Further, a cam groove 12B into which the cam pin 13B of the external rectilinear cylinder 13 is fitted and an interlocking groove 12C into which the rectilinear guide pin 15A of the double-side cam cylinder 15 is fitted are formed on the inner periphery of the cam cylinder 12. . The cam groove 12B is formed so that the position in the optical axis OA direction changes in a predetermined relationship in the circumferential direction. The interlocking groove 12C is formed in parallel with the optical axis OA.

The external rectilinear cylinder 13 has a cylindrical shape with a predetermined thickness and is located on the inner peripheral side of the cam cylinder 12. A bayonet portion 13 </ b> A is formed on the rear edge of the external rectilinear cylinder 13. The bayonet portion 13A engages with a bayonet portion 15B of the double-sided cam cylinder 15 described later, but can be relatively rotated but cannot be relatively moved in the direction of the optical axis OA. A rectilinear guide groove 13 </ b> C is formed on the inner periphery of the external rectilinear cylinder 13. A rectilinear guide portion 21 of a rectilinear guide key 20 is fitted in the rectilinear guide groove 13C.
Thus, when the double-sided cam cylinder 15 rotates and moves straight, the external rectilinear cylinder 13 is guided by the rectilinear guide portion 21 of the rectilinear guide key 20 and moves linearly without rotating. Yes.

  The rectilinear guide key 20 includes a rectilinear guide portion 21 that guides the rectilinear movement of the external rectilinear cylinder 13 and a rectilinear guide 22 that guides the rectilinear movement of the rectilinear guide cylinder 16. The rectilinear guide key 20 is provided at the rear end of the cam cylinder 12 so as to be relatively rotatable and immovable in the direction of the optical axis OA.

  The first group rectilinear cylinder 14 has a cylindrical shape with a predetermined thickness, holds the first lens group L1 at the end portion on the front surface side, and is positioned on the inner peripheral side of the external rectilinear cylinder 13. On the inner periphery of the first group rectilinear cylinder 14, a follower pin 14A protrudes in the vicinity of the back side, and a rectilinear groove 14B is formed in parallel with the optical axis OA. The follower pin 14 </ b> A is fitted in the first group cam groove 15 </ b> C of the double-sided cam barrel 15. A rectilinear guide protrusion 16A of the rectilinear guide tube 16 is fitted in the rectilinear groove 14B.

  When the double-sided cam cylinder 15 rotates, the first group rectilinear cylinder 14 is restricted from rotating by the rectilinear guide protrusion 16A of the rectilinear guide cylinder 16, and the follower pin 14A is operated by the first group cam groove 15C and moves in the direction of the optical axis OA. That is, the first group rectilinear cylinder 14 advances straight without rotating due to the rotation of the double-sided cam cylinder 15.

The double-sided cam cylinder 15 has a cylindrical shape with a predetermined thickness, and is located on the inner peripheral side of the first-group rectilinear cylinder 14. A rectilinear guide pin 15 </ b> A protrudes from the back side outer periphery of the double-sided cam cylinder 15. The rectilinear guide pin 15 </ b> A is fitted in the interlocking groove 12 </ b> C of the cam cylinder 12. Thereby, the double-sided cam cylinder 15 rotates in synchronization with the rotation of the cam cylinder 12.
Further, a bayonet portion 15B is formed at the rear end portion of the double-sided cam barrel 15. The bayonet portion 15B can be rotated relative to the bayonet portion 13A of the external rectilinear cylinder 13 but is immovably engaged in the direction of the optical axis OA.
As a result, the double-sided cam barrel 15 moves straight along with the external rectilinear barrel 13. That is, the double-sided cam cylinder 15 moves straight along with the rectilinear advance of the external rectilinear cylinder 13 while rotating in synchronization with the rotation of the cam cylinder 12.

A first group cam groove 15 </ b> C is formed on the outer periphery of the double-sided cam cylinder 15. A follower pin 14A of the first group rectilinear cylinder 14 is fitted in the first group cam groove 15C.
Further, a bayonet groove 15D, a second group drive cam groove 15E, and a third group drive cam groove 15F are formed on the inner periphery of the double-sided cam cylinder 15. The bayonet protrusion 16B of the straight guide tube 16 is fitted in the bayonet groove 15D. A second group follower pin 17A of the second group lens chamber 17 is fitted in the second group drive cam groove 15E. The second group follower pin 18A of the third group lens chamber 18 is fitted in the third group drive cam groove 15F.

The rectilinear guide tube 16 has a cylindrical shape with a predetermined thickness and is located on the inner peripheral side of the double-sided cam tube 15. A rectilinear guide protrusion 16 </ b> A protrudes from the front side of the rectilinear guide tube 16. The rectilinear guide protrusion 16 </ b> A is fitted in the rectilinear groove 14 </ b> B of the first group rectilinear cylinder 14.
On the inner periphery of the straight guide tube 16, a bayonet ridge 16B is projected. The bayonet protrusion 16B is fitted in the bayonet groove 15D of the double-sided cam barrel 15. As a result, the rectilinear guide tube 16 is connected to the double-sided cam tube 15 so as to be relatively rotatable but immovable in the direction of the optical axis OA.

Further, a flange-like flange 16 </ b> F is formed on the outer periphery of the front end portion of the rectilinear guide tube 16. The outer diameter of the flange 16F is substantially equal to the outer diameter of the double-sided cam cylinder 15, and the flange 16F is positioned so as to cover the front side end side of the double-sided cam cylinder 15. The straight guide protrusion 16A protrudes from the outer peripheral surface of the flange 16F.
Further, the rectilinear guide tube 16 is formed with rectilinear guide slits 16C and rectilinear grooves 16H. The 2nd group follower pin 17A of the 2nd group lens chamber 17 and the 3rd group follower pin 18A of the 3rd group lens chamber 18 pass through the rectilinear guide slit 16C.

A rectilinear guide 22 of a rectilinear guide key 20 is fitted in the rectilinear groove 16H of the rectilinear guide cylinder 16, and the rectilinear guide cylinder 16 is restricted in rotation by the rectilinear guide 22 and is allowed only rectilinear advance. ing.
Thereby, the rectilinear guide cylinder 16 advances straight without rotating as the double-sided cam cylinder 15 advances straight while rotating. That is, the double-sided cam barrel 15 advances straight while rotating, whereas the rectilinear guide barrel 16 advances straight without rotating.

  The second group lens chamber 17 is formed in a short cylindrical shape and holds the second lens group L2 in the center thereof. On the outer periphery of the second group lens chamber 17, a second group follower pin 17A is projected. The second group follower pin 17 </ b> A is fitted into and penetrates the straight guide slit 16 </ b> C of the straight guide cylinder 16, and the tip is fitted in the second group drive cam groove 15 </ b> E of the double-sided cam cylinder 15.

  The third group lens chamber 18 is formed in a short cylindrical shape, holds the third lens group L3 at the center thereof, and further holds a shutter unit 18S on the front side of the third lens group L3. A third group follower pin 18 </ b> A projects from the outer periphery of the third group lens chamber 18. The third group follower pin 18 </ b> A is fitted into and penetrates the straight guide slit 16 </ b> C of the straight guide cylinder 16, and the tip is fitted in the third group drive cam groove 15 </ b> F of the double-sided cam cylinder 15.

The fourth group lens chamber 19 holds the fourth lens group L4 in the center of a substantially disc-shaped holding plate portion 19A. A guide hole 19B is formed at a predetermined position in the vicinity of the outer peripheral edge of the holding plate portion 19A. The fourth group lens chamber 19 includes an operation arm portion 19C protruding from the holding plate portion 19A.
The operation arm portion 19C is a plate having a predetermined width and a predetermined thickness, and extends in the radial direction to form a main bearing portion 19D into which a main guide shaft 51 described later is fitted. A drive female screw 19E to which the screw 42 is screwed is provided.

The main bearing portion 19D has an operation arm portion 19C and a support plate 19Da integrally formed with a predetermined distance on the front side thereof, and a main bearing hole 19Db is formed in communication with the optical axis OA. A main guide shaft 51, which will be described later, is fitted in the main bearing hole 19Db so as to be slidable.
The fourth group lens chamber 19 is guided to move in the direction of the optical axis OA by two guide shafts (main guide shaft 51 and sub guide shaft 52) fixed to the sensor unit base 30, and is driven to move by the drive operation mechanism 40. .

  One main guide shaft 51 that moves and guides the fourth group lens chamber 19 is implanted in the sensor unit base 30 at the base end, and is positioned at a predetermined position in the circumferential direction on the outer peripheral side of the outer periphery of the fixed cylinder 11. Are arranged in parallel with each other. The length of the main guide shaft 51 corresponds to the amount of movement of the fourth group lens chamber 19 (that is, the fourth lens group L4) in the optical axis OA direction. The main guide shaft 51 is fitted in a main bearing hole 19Db of a main bearing portion 19D formed in the operation arm portion 19C in the fourth group lens chamber 19. The main guide shaft 51 exclusively guides the movement of the fourth group lens chamber 19 (fourth lens group L4).

  The other sub-guide shaft 52 that moves and guides the fourth group lens chamber 19 is implanted in the sensor unit base 30 at the base end, and is located at a position away from the main guide shaft 51 by a predetermined angle in the circumferential direction. Are arranged in parallel with each other. The length of the sub guide shaft 52 corresponds to the amount of movement of the fourth group lens chamber 19 (that is, the fourth lens group L4) in the optical axis OA direction. The sub guide shaft 52 is fitted in a guide hole 19 </ b> B formed in the holding plate portion 19 </ b> A in the fourth group lens chamber 19. The sub guide shaft 52 restricts the rotation of the fourth group lens chamber 19 around the main guide shaft 51, so that the optical axis of the fourth lens group L 4 held by the fourth group lens chamber 19 is adjusted to the lens barrel 10. It acts to prevent deviation from the entire optical axis OA.

Here, the position of the sub guide shaft 52 in the radial direction is set to the linear guide cylinder 16 side from the inner peripheral surface of the double cam cylinder 15 between the double cam cylinder 15 and the linear guide cylinder 16. This is because the rectilinear guide tube 16 does not rotate during rectilinear movement, so that it is sufficient to form a minimum necessary accommodation space.
At a position corresponding to the position where the sub guide shaft 52 is disposed in the rectilinear guide cylinder 16, a guide shaft housing recess 16D having a size capable of housing the sub guide shaft 52 is formed in parallel with the optical axis OA. The front surface side of the guide shaft housing recess 16D is closed by a closing portion 16G that is continuous with the flange 16F formed on the front surface side of the rectilinear guide tube 16.

The drive operation mechanism 40 for moving and driving the fourth group lens chamber 19 includes a drive motor 41 mounted on the motor support portion 11A of the fixed cylinder 11, and a feed screw 42 connected to the rotation shaft of the drive motor 41 and driven to rotate. And is constituted by.
The feed screw 42 is arranged in parallel with the optical axis OA and is screwed with a drive female screw 19E provided in the operation arm portion 19C in the fourth group lens chamber 19.
The drive operation mechanism 40 moves and drives the drive female screw 19 </ b> E by the rotational drive of the feed screw 42 by the drive motor 41. Accordingly, the fourth group lens chamber 19 is guided (along) by the main guide shaft 51 and moves in the direction of the optical axis OA. That is, the fourth lens unit L4 is operated to move straight forward.

  In the retracted state shown in FIG. 1, the lens barrel 10 configured as described above has the first lens unit L1, the second lens unit L2, the third lens unit L3, and the fourth lens unit L4 on the optical axis OA. It is stored compactly adjacent to each other. The second lens group L2, the third lens group L3, and the fourth lens group L4 are positioned in the overlapping region (inner peripheral side) in the radial direction of the main guide shaft 51 and the sub guide shaft 52 that move and guide the fourth group lens chamber 19. To do. In other words, the guide shafts 51 and 52 are positioned on the outer peripheral side of the lens groups L2, L3, and L4. The sub guide shaft 52 is housed inside a guide shaft housing recess 16D formed on the outer periphery of the rectilinear guide tube 16 (between the double-sided cam tube 15).

Then, the lens barrel 10 extends from the retracted state shown in FIG. 1 when the fixed cylinder 11 is rotationally driven by a feeding motor (not shown), and enters the photographing state shown in FIG.
That is, as the fixed cylinder 11 rotates, the cam cylinder 12 moves straight while rotating. The external rectilinear cylinder advances straight due to the rotation of the cam cylinder. The double-sided cam barrel 15 goes straight along with the external rectilinear barrel while rotating as the cam barrel rotates. Further, the rectilinear guide tube 16 moves straight without rotating as the double-sided cam tube 15 moves straight. The first group rectilinear cylinder 14, the second group lens chamber 17, and the third group lens chamber 18 move straight to each predetermined position without rotating by the rotation of the double-sided cam cylinder 15.

  As a result, the first lens group L1, the second lens group L2, and the third lens group L3 are at predetermined positions where photographing is possible. In addition, the fourth lens group chamber 19 is moved and operated by the drive operation mechanism 40, and the fourth lens group L4 becomes a predetermined position. As described above, the fourth lens group L4 is a focusing lens group, and is operated straight by the drive operation mechanism 40 at the time of photographing to perform a focusing action.

  Here, in the photographing state shown in FIG. 3, the rectilinear guide tube 16 moves together with the double-sided cam tube 15 to the front side with respect to the sub guide shaft 52, and the guide shaft housing recess 16 </ b> D comes off the sub guide shaft 52 and moves to the front side. Located in. In other words, the sub guide shaft 52 is missing on the back side of the guide shaft housing recess 16D. Even in this state, since the front side of the guide shaft housing recess 16D is blocked by the closing portion 16G formed integrally with the flange 16F of the rectilinear guide tube 16, stray light is incident on the guide shaft housing recess 16D from the front side. Never do.

  5-8 is a figure which showed the comparison form. These drawings correspond to FIGS. 1 to 4 in the present embodiment, respectively, and the arrangement of the sub guide shaft 52 ′ and the guide shaft accommodating recess 16D are not provided, and the through holes 17D ′ and 18D ′ are not provided. The configuration is basically the same except that there is. For this reason, the same code | symbol is attached | subjected to the same component. However, the reference numerals are limited to the main elements in order to avoid complexity. FIG. 8 also shows a third group lens chamber 18 unlike FIG.

  That is, as in the comparative example shown in FIGS. 5 to 8, the sub guide shaft 52 ′ is arranged on the inner peripheral side of the rectilinear guide tube 16, and the second lens unit L <b> 2 and the third lens unit L <b> 3 are retracted (collapsed). In the state), the sub guide shaft 52 'penetrates through holes 17D' and 18D 'formed in the second group lens chamber 17' and the third group lens chamber 18 '. In such a configuration, in the photographing state in which the lens barrel 10 is extended, as shown by an arrow in FIG. 7, the light beam incident from the first lens unit L1 passes through the through holes 17D ′ and 18D ′, and the fourth lens. There is a risk of reaching the group L4 and entering the imaging element 31A as stray light. As a result, problems such as flare and a decrease in contrast are caused in the captured image.

  On the other hand, in the configuration of the present embodiment, the guide shaft housing recess 16D that houses the sub guide shaft 52 in the retracted state is closed at the front side by the closing portion 16G, and light is transmitted through the guide shaft housing recess 16D. Does not enter the back side and cause stray light.

As described above, this embodiment has the following effects.
(1) A guide shaft housing recess 16D for housing the sub guide shaft 52 in the retracted state is formed on the outer periphery of the rectilinear guide tube 16 positioned adjacent to the inner peripheral side of the double-sided cam tube 15. The front side of the guide shaft housing recess 16D is closed by the closing portion 16G, so that no light is incident on the guide shaft housing recess 16D from the front side even in a shooting state where the sub guide shaft 52 is not housed. Stray light caused by the incident light can be prevented. As a result, no trouble is caused in the captured image due to stray light caused by the arrangement structure of the sub guide shaft 52.

(2) Since the guide shaft accommodating recess 16D is formed in the rectilinear guide tube 16 that moves straight without rotating, it does not need to be formed large in order to allow its rotation as in the case of being formed on a rotating member. Can be configured compactly.

(Deformation)
The present invention is not limited to the above-described embodiment, and various modifications and changes as described below are possible, and these are also within the scope of the present invention.
(1) In this embodiment, the camera 1 in which the lens barrel 10 and the body part 2 are integrally configured has been described as an example. However, the present invention is not limited to this, and may be applied to a so-called interchangeable lens that can be attached to and detached from the body portion.
(2) In the present embodiment, the present invention is applied to a configuration in which the movement of the second lens unit L2, which is a focusing lens unit, is guided by the guide shafts (the main guide shaft 51 and the sub guide shaft 52). However, the member to be guided to move is not limited to the focusing lens group, and may be a zooming lens, another optical element, or the like.

(3) In the present embodiment, the guide shaft housing recess 16D that houses the sub guide shaft 52 in the retracted state is disposed between the double-sided cam tube 15 and the rectilinear guide tube 16 that adjoins both and moves straight. ing. However, the portion for accommodating the sub guide shaft 52 (position of the sub guide shaft 52) is not limited to this, and may be set between other cylindrical members.
In addition, although embodiment and a deformation | transformation form can also be used in combination as appropriate, detailed description is abbreviate | omitted. Further, the present invention is not limited to the embodiment described above.

  1: camera, 2: body part, 31A: imaging element, 10: lens barrel, 11: fixed barrel, 12: cam barrel, 13: external rectilinear barrel, 14: 1 group rectilinear barrel, 15: double-sided cam barrel, 16 : Linear guide cylinder, 17: 2 group lens chamber, 18: 3 group lens chamber, 19: 4 group lens chamber, 20: Linear guide key, 40: Drive operation mechanism, 41: Drive motor, 51: Main guide shaft, 52 : Sub guide axis, OA: Optical axis

Claims (9)

A first cylinder and a second cylinder that advance and retract in the optical axis direction;
A guide shaft that is disposed between the first cylinder and the second cylinder and guides the lens group in a straight line;
A lens barrel comprising: The lens barrel according to claim 1,
The first cylinder and the second cylinder are adjacent to each other;
A lens barrel characterized by The lens barrel according to claim 2,
One of the first cylinder and the second cylinder is a rotating cylinder and the other is a rectilinear cylinder;
A lens barrel characterized by The lens barrel according to claim 3,
The rectilinear cylinder is disposed inside the rotating cylinder;
A lens barrel characterized by The lens barrel according to any one of claims 1 to 4,
The first cylinder and the second cylinder are integrally moved in the optical axis direction;
A lens barrel characterized by The lens barrel according to any one of claims 1 to 5,
A light-shielding portion is formed at one end of the first tube and the second tube;
A lens barrel characterized by The lens barrel according to claim 6, wherein
The light-shielding portion is provided in a flange shape projecting from the end portion to the other cylinder side;
A lens barrel characterized by The lens barrel according to any one of claims 1 to 7,
The guide shaft is formed with a recessed portion recessed on the inner peripheral side extending in the optical axis direction in a part of a side surface of a cylinder disposed on the inner side, and the guide shaft is disposed in the recessed portion,
A lens barrel characterized by   A camera provided with the lens barrel of any one of Claims 1-8.

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