JP2015232667A - Lens barrel and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel and an imaging device that can quickly dry water droplets accumulated inside the tip of the lens barrel to reduce leakage of water to the outside of the lens barrel and corrosion of components of the lens barrel.SOLUTION: There is provided a lens barrel including an imaging optical system, a first frame that holds the imaging optical system, and a front member that is fixed to the front face on a subject side of the first frame and has an opening with a diameter smaller than that of the first frame, where the front member has a first evaporation acceleration member made of a water-absorbing material arranged thereon, and a first induction member inducting water to the evaporation acceleration member from the inside diameter part of the first frame.

Description

  The present invention relates to a lens barrel and an imaging apparatus, and more particularly to a lens barrel and an imaging apparatus that have a retractable barrel structure and are waterproof and drip-proof.

  Conventionally, there are known lens barrels and cameras that have a multi-stage barrel structure that has a barrel structure that can be retracted and retracted, and that has a structure that prevents intrusion and immersion from the outside through adjacent cylinders. Yes.

  In the technique disclosed in Patent Document 1, as described in FIG. 6 and FIG. 1 of Patent Document 1, a waterproof member (O for keeping watertight between the barrier driving member 50 and the first frame 30). Since the ring 55 is provided, the lens barrel behind the first group lens 61 has a structure in which water droplets do not enter. In the prior art disclosed in Patent Document 2, as shown in FIG. 4 of Patent Document 2, the water droplet sensor 3f is provided around the opening 1a in front of the photographing lens 2, and the water droplet sensors 3f and 3g are arranged. It is possible to quickly detect water droplets in the vicinity of 2 and close the barrier blade.

JP 2005-173166 A JP 2005-274701 A

  However, Patent Document 1 has a structure in which water droplets and water enter the space between the barrier decoration (front member) 90 where the barrier blade 70 is located and the first lens group 61. And when the power is turned off, the barrier blades are closed and water droplets are left. Later, the water droplets flow out to the outside and wet other things, and it takes time to dry and the parts are easily corroded. . According to Permissible Document 2, when the power is turned off, the barrier blades are closed and left in the opening 1a before detection. Water drops flow out to the outside and wet other objects, and it takes time to dry. Corrosion of parts is likely to occur.

  Accordingly, an object of the present invention is to quickly dry the water droplets accumulated inside the lens barrel tip in the lens barrel and the imaging device, thereby reducing water leakage to the outside of the lens barrel and corrosion of the lens barrel components. It is an object to provide a lens barrel and an imaging device that can be used.

To achieve the above purpose,
The present invention of claim 1
Photographic optics,
A first frame for holding the photographing optical system;
In the lens barrel having a front member fixed to the subject side front surface of the first frame and having an opening smaller than the diameter of the first frame,
A first evaporation promoting member made of a water absorbing material is disposed on the front member,
A first attracting member for attracting water from the inner diameter portion of the first frame to the evaporation promoting member is disposed.

The present invention of claim 2
The lens barrel according to claim 1,
Between the photographing optical system and the front member,
A plurality of barrier blades that can be moved back and forth with respect to the optical path of the photographing optical system are arranged,
A second evaporation promoting member is disposed on each of one or more of the plurality of barrier blades;
A second attracting member for attracting water is disposed from the first evaporation promoting member or the first attracting member to the second evaporation promoting member.

The present invention of claim 3
The lens barrel according to claim 1,
Between the photographing optical system and the front member,
A plurality of barrier blades capable of moving back and forth with respect to the optical path of the photographing optical system are arranged, and at least two of the plurality of barrier blades are each provided with a second evaporation promoting member,
A connecting member made of a water-absorbing material for connecting the second evaporation promoting members to each other is arranged.

The present invention of claim 4
The lens barrel of claims 2 and 3,
When the plurality of barrier blades are retracted from the optical path of the photographing optical system,
The first evaporation promotion member and the plurality of second evaporation promotion members are overlapped when viewed from the optical axis direction,
When the plurality of barrier blades enter the optical path of the photographing optical system,
The first evaporation accelerating member and the plurality of second evaporation accelerating members are not substantially overlapped when viewed from the optical axis direction.

  A fifth aspect of the present invention is an imaging apparatus having the lens barrel according to any one of the first to fourth aspects.

  According to the present invention, in the lens barrel and the imaging device, water droplets accumulated inside the lens barrel tip can be dried quickly, and water leakage to the outside of the lens barrel and corrosion of the lens barrel components can be reduced. A lens barrel and an imaging device can be provided.

Sectional drawing which showed the retracted position of the lens barrel which shows one embodiment of this invention 1 is an exploded perspective view of the float key and the straight frame of the lens barrel in FIG. 1 is a front view of the lens barrel when the lens barrel in FIG. 1 is viewed from the direction III. Sectional drawing which showed the imaging position of the lens barrel in FIG. 4 is a front view of the lens barrel when the lens barrel in FIG. 4 is viewed from the V direction. Sectional drawing which showed the position which also starts the 2nd barrier blade | wing of the lens barrel in FIG. Front view of the lens barrel when the lens barrel in FIG. 6 is viewed from the direction VII. 2 is an enlarged view of the first barrier blade 70, the second barrier blade 80, and the barrier decoration (front member) 90 portion of the exploded perspective view of FIG. The perspective view which looked at the barrier decoration (front member) 90 from the VIII direction of FIG. The perspective view which looked at the 2nd barrier blade | wing 80 from the VIII direction of FIG. The perspective view which looked at the 1st barrier blade 70 from the VIII direction of Drawing 8 Sectional view cut along section AB in FIG. 3 at the retracted position of the lens barrel Sectional drawing cut | disconnected by the cross section AB of FIG. 7 in the position which the 2nd barrier blade begins to close Sectional view cut along section AB in FIG. 5 at the photographing position The perspective view which looked at the barrier decoration (front member) 90, the 2nd barrier blade | wing 80, and the 1st barrier blade | wing 70 from the VIII direction of FIG. 8 is a rear view of only the barrier decoration (front member) 90, the second barrier blade 80, and the first barrier blade 70 viewed from the direction VIII in FIG. FIG. 6 is a rear view of only the barrier decoration (front member) 90, the second barrier blade 80, and the first barrier blade 70 viewed from the direction VIII in FIG. 8 at the position where the second barrier blade of FIG. 6 starts to close. 8 is a rear view of only the barrier decoration (front member) 90, the second barrier blade 80, and the first barrier blade 70 viewed from the direction VIII in FIG.

  Hereinafter, a preferred embodiment for carrying out the present invention will be described with reference to the drawings.

[Embodiment 1]
FIG. 1 is a cross-sectional view showing a retracted position of a lens barrel showing an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a float key and a rectilinear frame of the lens barrel in FIG.

  As shown in FIG. 1, the lens barrel 1 is a fixed frame 10 whose base end is fixed to a camera body (not shown), and a third frame that is rotatably fitted inside the fixed frame 10. A straight frame that is a first frame that is fitted inside the rotary frame 20 and moves between the retracted position as the first position and the imaging position as the second position in the optical axis direction. A frame 30, a float key 40, which is fitted inside the rectilinear frame 30 and guides the rectilinear movement of the rectilinear frame 30 in the optical axis direction, and the front end of the rectilinear frame 30 in the optical axis direction. The main portion is configured to include a first group frame 60 that is fitted inside the rectilinear frame 30 and holds the first group lens 61 that is a part of the photographing optical system. In order to avoid the complexity of the drawing, the second group lens, the third group lens, the focus, and the shutter mechanism constituting the photographing optical system are omitted.

  On the inner peripheral surface of the fixed frame 10, for example, three rectilinear grooves 10 a positioned at equal intervals along the circumferential direction are formed along the optical axis direction, and the female helicoid screw 10 b is connected to the inner periphery of the fixed frame 10. The surface is formed in a spiral shape. Further, when the rotary frame 20 is fitted inside the fixed frame 10 at the tip of the inner peripheral surface of the fixed frame 10, one end is arranged between the fixed frame 10 and the rotary frame 20 and the outer periphery of the rotary frame 20. The other end of the light shielding member 11 in contact with the surface is fixed.

  In addition, a motor drive source for rotationally driving the rotary frame 20 (not shown) is disposed on the outer peripheral surface of the fixed frame 10.

  A male helicoid screw 20 a that is screwed with the female helicoid screw 10 b of the fixed frame 10 is formed at the rear end of the outer peripheral surface of the rotating frame 20. Note that a spur gear is formed on a part of the male helicoid screw 20a, and this spur gear is screwed with a gear (not shown) of a motor drive source disposed on the fixed frame 10. Yes.

  Therefore, the rotating frame 20 is rotatably fitted inside the fixed frame 10 by screwing the female helicoid screw 10b and the male helicoid screw 20a. Accordingly, when the male helicoid screw 20a is rotationally driven by the motor drive source, the rotating frame 20 moves forward and backward in the optical axis direction while rotating with respect to the fixed frame 10.

  A female helicoid screw 20b is formed on the inner peripheral surface of the rotating frame 20, and a circumferential groove 20c along the circumferential direction is formed near the rear end of the inner peripheral surface of the rotating frame 20. ing.

  Furthermore, when the rectilinear frame 30 is fitted inside the rotating frame 20 at the tip of the inner peripheral surface of the rotating frame 20, the rotating frame 20 is disposed between the rotating frame 20 and the rectilinear frame 30 and one end is the outer periphery of the rectilinear frame 30. The other end of the light shielding member 21 in contact with the surface is fixed. Further, on the inner peripheral surface of the rotating frame 20, a second group lens (not shown) and a frame holding the third group lens, which are a part of the photographic optical system serving as a zoom lens, are not shown for driving forward and backward in the optical axis direction. A cam groove is formed.

  A male helicoid screw 30 a that is screwed with the female helicoid screw 20 b of the rotary frame 20 is formed at the rear end of the outer peripheral surface of the rectilinear frame 30. Therefore, the rectilinear frame 30 is rotatably fitted inside the rotating frame 20 with respect to the rotating frame 20 by the female helicoid screw 20b and the male helicoid screw 30a being screwed together.

  An inward flange portion 31 having an opening 30B serving as an optical path for the first lens group 61, a second lens group (not shown), and a third lens group is formed in the center portion as shown in FIG. Has been.

  In the inward flange portion 31, a pair of barrier shaft holes 37 are formed in a point symmetry with respect to the optical axis O in the peripheral portion of the opening 30B. Further, on the surface on the front side in the optical axis direction of the inward flange portion 31 (hereinafter referred to as the tip surface) 31A, in the vicinity of the peripheral portion of the barrier shaft hole 37, a cylindrical shape is projected so as to protrude forward in the optical axis direction. A pair of opening spring hooks 34 are formed point-symmetrically about the optical axis O.

  In addition, a pair of screw holes 33 on the distal end surface 31A of the inward flange portion 31 and in a direction away from the optical axis O of the opening spring hooking portion 34 are point-symmetrical with respect to the optical axis O as a center of the rectilinear frame 30. It is formed in contact with the inner peripheral surface.

  Further, on the distal end surface 31A of the inward flange portion 31, in the vicinity of the screw hole 33, proximal end portions of a pair of engaging convex portions 32 projecting forward in the optical axis direction symmetrically about the optical axis O. Is formed in contact with the inner peripheral surface of the rectilinear frame 30. In addition, the front end surface of the engaging convex part 32 is formed to be the same height as the front end surface 30 </ b> A formed on the outer periphery of the rectilinear frame 30 in the optical axis direction front.

  Further, on the outer peripheral edge of the opening 30B of the inward flange portion 31 on the front end surface 31A of the inward flange portion 31, a circumferential edge portion 31s protruding forward is formed. Further, on the front end surface 31A of the inward flange portion 31, the edge portion 31s and the inner peripheral surface of the rectilinear frame 30 are coupled between the edge portion 31s and the inner peripheral surface of the rectilinear frame 30. Four rail portions 31b extending radially from the edge portion 31s are formed.

  The four rail portions 31b have a partial arc shape, protrude forward from the tip surface 31A of the inward flange portion 31, and are formed at positions where one set is point-symmetric about the optical axis O. . The four rail portions 31b and the edge portion 31s are integrally formed and are formed to have the same height with respect to the front in the optical axis direction.

  Further, a region on the front end surface 31A of the inward flange portion 31 and surrounded by the barrier shaft hole 37, the single rail portion 31b, the edge portion 31s, and the inner peripheral surface of the rectilinear frame 30 is partially A pair of insertion grooves 31c having an arc shape are formed at positions that are symmetric about the optical axis O.

  Each pair of the barrier shaft hole 37, the opening spring hooking portion 34, the screw hole 33, the engaging convex portion 32, and the fitting groove 31c is formed by two rail portions formed at asymmetric positions around the optical axis O. It is formed in a region surrounded by 31b, the edge 31s and the inner peripheral surface of the rectilinear frame 30.

  Further, two rail portions 31b on the front end surface 31A of the inward flange portion 31 and surrounding the pair of barrier shaft holes 37, the opening spring hooking portions 34, the screw holes 33, the engaging convex portions 32, and the fitting grooves 31c, respectively. In the region surrounded by one rail portion 31b, and the other rail portion 31b and the rail portion 31b formed at a point symmetric with respect to the optical axis O, the region protrudes forward in the optical axis direction. A pair of closing spring hooks 36 each having an oval-shaped cross section and a pair of closing spring shafts 35 having a substantially cylindrical shape protruding in the optical axis direction and located in the vicinity of the closing spring hook 36 are light beams. It is formed point-symmetrically with respect to the axis O.

  Further, for example, five convex rectilinear keys 30b, which are rotation stoppers, are formed along the optical axis direction behind the inward flange portion 31 on the inner peripheral surface of the rectilinear frame 30 along the optical axis direction. . Of these five, the two rectilinear keys 30 b are arranged in the vicinity of the barrier shaft hole 37 in the circumferential direction of the rectilinear frame 30.

  Inside the rectilinear frame 30, linear grooves 40c and linear grooves 40e, which will be described later, are slidably fitted into the five rectilinear keys 30b, so that the float key 40 is slid so as to advance and retreat in the optical axis direction. . Alternatively, a convex straight key may be provided on the float key 40, and a straight groove may be formed in the straight frame 30 so that both engage with each other.

  At the rear end of the outer peripheral surface of the float key 40, for example, three rectilinear keys 40a located at equal intervals in the circumferential direction are formed so as to protrude in a direction away from the optical axis O. Further, as shown in FIG. 1, the three rectilinear keys 40 a are fitted into three rectilinear grooves 10 a formed on the inner peripheral surface of the fixed frame 10. Therefore, the float key 40 is advanced or retracted only in the optical axis direction with respect to the fixed frame 10 by the straight advance key 40a.

  Further, on the outer peripheral surface of the float key 40 and in the vicinity of the front side in the optical axis direction of the rectilinear key 40a, for example, three bayonet claws 40b, which are engaging portions positioned at equal intervals along the circumferential direction, It protrudes in a direction away from the axis O.

  Further, of the three bayonet claws 40b, in the vicinity of the two bayonet claws 40b, for example, two bayonet claws 40f that are symmetrical with respect to the optical axis O are separated from the optical axis O. It is formed so as to protrude in the direction.

  The bayonet claw 40b and the bayonet claw 40f are formed so that the protruding height thereof is lower than the protruding height of the straight key 40a. As will be described later, the bayonet claw 40f is for receiving a force in the optical axis direction when the rectilinear frame 30 is retracted into the float key 40.

  As shown in FIG. 1, the three bayonet claws 40 b and the two bayonet claws 40 f are fitted into a circumferential groove 20 c formed on the inner peripheral surface of the rotary frame 20. Accordingly, the float key 40 is restricted from moving in the optical axis direction with respect to the rotary frame 20 by the circumferential groove 20c. That is, the float key 40 and the rotary frame 20 advance and retreat integrally in the optical axis direction by the circumferential groove 20c.

  Therefore, the circumferential groove 20c of the rotary frame 20 constitutes a thrust position restricting portion in the present invention. Further, the rotary frame 20 is rotatable about the optical axis with respect to the float key 40.

  A pair of notches 40g symmetric with respect to the optical axis O having a shape recessed backward in the optical axis direction is formed on the circumference of the tip of the float key 40 in the optical axis direction. A pair of pressing portions 40d protruding forward in the optical axis direction, for example having a triangular prism shape, are formed at positions that are point-symmetric with respect to the optical axis O. The pair of pressing portions 40d is formed with a pressing surface 40d1 in a direction inclined with respect to the optical axis O.

  Further, on the outer peripheral surface of the float key 40, for example, three rectilinear grooves 40c that are guide portions are formed along the optical axis direction from the tip end in the optical axis direction to the vicinity of the front side in the optical axis direction of the three bayonet claws 40b. ing. Of the five rectilinear keys 30b formed on the inner peripheral surface of the rectilinear frame 30, the three rectilinear keys 30b are slid into the three rectilinear grooves 40c.

  Further, on the outer peripheral surface of the float key 40, it is in the vicinity of the base end portion of the pair of pressing portions 40d and extends from the tip of the notch 40g to the vicinity of the front side of the two bayonet claws 40f in the optical axis direction. Thus, for example, two rectilinear grooves 40e, which are guide portions, are formed.

  That is, out of the five bayonet claws and the rectilinear grooves provided respectively, the two bayonet claws 40f and the rectilinear grooves 40e are positions where the pair of pressing portions 40d are disposed at the circumferential position of the float key 40. It is arranged near.

  Of the five rectilinear keys 30b formed on the inner peripheral surface of the rectilinear frame 30, two rectilinear keys 30b slide into the two rectilinear grooves 40e. As will be described later, the rectilinear groove 40e serves to assist in receiving a force around the optical axis when the rectilinear frame 30 is retracted into the float key 40.

  From this, the three linear grooves 40c and the two linear grooves 40e are slidably fitted into the five linear keys 30b, so that the float key 40 is placed inside the linear frame 30 in the optical axis direction. The slide is inserted to advance and retreat.

  Therefore, even if the male helicoid screw 30a and the female helicoid screw 20b of the rotating frame 20 are screwed together and the rectilinear frame 30 is rotated by the rotating frame 20, the float key 40 is moved by the rectilinear groove 40c and the rectilinear groove 40e. In contrast, it advances and retreats only in the optical axis direction.

  From the above, in the lens barrel 1, when the rotary frame 20 is rotated by the motor drive source, the rotary frame 20 and the float key 40 advance and retract in the optical axis direction with respect to the fixed frame 10, and the rectilinear frame 30 also rotates. In response to the rotation of the frame 20, the float key 40 advances and retracts in the optical axis direction.

  A part of the pair of barrier drive members 50 is fitted in the pair of barrier shaft holes 37 formed in the inward flange portion 31 of the rectilinear frame 30 so as to be rotatable about an axis parallel to the optical axis. Specifically, the main part of the barrier driving member 50 is constituted by a shaft portion 50b and a spring receiving portion 51 formed at the front portion of the shaft portion in the optical axis direction.

  The shaft portion 50b is formed in a cylindrical shape with a hollow center, and a cam surface is formed at an end in the optical axis direction of the cylindrical wall portion of the shaft portion 50b in a direction inclined with respect to the optical axis direction. Has been.

  The cam surface 50c contacts the pressing surface 40d1 of the pressing portion 40d of the float key 40 when the rectilinear frame 30 is retracted. Thus, the barrier driving member 50 is opposite to one direction in the circumferential direction, which is a direction toward a position corresponding to the closed state of the first barrier blade 70 and the second barrier blade 80, which will be described later. Rotate in the other direction.

  Further, the outer diameter of the shaft portion 50 b is formed so as to substantially match the inner diameter of the barrier shaft hole 37. Further, an O-ring groove 50d into which an O-ring 55 that is a waterproof member is fitted is formed along the outer periphery on the spring receiving portion 51 side of the outer peripheral surface of the shaft portion 50b.

  A mountain-shaped spring receiving portion 51 having a circular bottom surface having a diameter larger than the diameter of the shaft portion 50b is formed on the surface of the shaft portion 50b in the optical axis direction. The surface on the opposite side of the bottom surface of the spring receiving portion 51 in the optical axis direction, on which the shaft portion 50 b is not formed, is in contact with the tip surface 31 A of the inward flange portion 31.

  Therefore, only the shaft portion 50b is rotatably fitted in the barrier shaft hole 37. In this state, the O-ring 55 is in an elastically deformed state with the outer periphery contacting the barrier shaft hole 37. Therefore, since the inner peripheral surface of the barrier shaft hole 37 and the outer peripheral surface of the shaft portion 50 b are kept watertight by the O-ring 55, dust, water droplets, and the like are not mixed into the rectilinear frame 30.

  The spring receiving portion 51 has a barrier shaft 50a formed at the center of the bottom surface of the spring receiving portion 51 so as to protrude forward in the optical axis direction, and an outer periphery of the bottom surface of the spring receiving portion 51 that is lower than the barrier shaft 50a. The spring guide 50g is an arcuate wall formed so as to protrude forward in the axial direction. The barrier shaft 50a serves as a rotation shaft for a first barrier blade 70 and a second barrier blade 80 described later.

  In the spring guide 50g, a movable arm insertion portion 50e that is a cutout and a fixed arm insertion portion 50h that is a cutout larger than the movable arm insertion portion 50e are formed in parallel to the optical axis direction. One end surface of the movable arm insertion portion 50e parallel to the optical axis is a spring pressing portion 50f.

  Furthermore, the inner peripheral surface of the spring guide 50g and the bottom surface of the spring receiving portion 51 form a spring accommodating portion 50i in which a barrier opening spring 110 described later is accommodated. Specifically, a part of the pair of barrier opening springs 110 that are opening urging members are accommodated in the pair of spring accommodating portions 50i.

  More specifically, the barrier opening spring 110 is, for example, a torsion spring in the present embodiment, and includes a support portion 110a, a fixed arm 110b, and a movable arm 110c. The barrier shaft 50a of the barrier driving member 50 is inserted into the support portion 110a, and the support portion 110a is placed in the spring accommodating portion 50i.

  The arm portion of the fixed arm 110b of the barrier opening spring 110 is inserted into the fixed arm insertion portion 50h of the barrier drive member 50, and the arm portion of the movable arm 110c is inserted into the movable arm insertion portion 50e of the barrier drive member 50. ing.

  The distal end of the arm portion of the fixed arm 110 b is locked between an opening spring hook portion 34 formed on the distal end surface of the inward flange portion 31 of the rectilinear frame 30 and a boss in which the screw hole 33 is formed. Further, the center of the arm portion of the movable arm 110 c is locked to the spring pressing portion 50 f of the spring guide 50 g of the barrier driving member 50.

  Therefore, the movable arm 110c of the barrier opening spring 110 constantly urges the spring pressing portion 50f of the barrier driving member 50 toward one circumferential direction. That is, the barrier opening spring 110 moves the barrier driving member 50 in one circumferential direction, which is a direction toward a position corresponding to an opening direction state of the first barrier blade 70 and the second barrier blade 80 described later. Always energized towards. Further, the distal end of the arm portion of the movable arm 110c is locked to an opening spring hook 70c of a first barrier spring 70 described later.

  A pair of closing spring shafts 35 formed on the front end surface 31A of the inward flange portion 31 of the rectilinear frame 30 is inserted with a barrier closing spring 120 as a pair of closing biasing members. In the present embodiment, the barrier closing spring 120 is a torsion spring.

  Specifically, the barrier closing spring 120 includes a support portion 120a, a fixed arm 120b, and a movable arm 120c. The closing spring shaft 35 of the inward flange portion 31 is inserted into the support portion 120a.

  The arm portion of the fixed arm 120 b of the barrier closing spring 120 is engaged with a closing spring hook 36 formed on the distal end surface 31 A of the inward flange portion 31 of the rectilinear frame 30, and the movable arm 120 c of the barrier closing spring 120 is engaged. The arm portion is locked to a closing spring hook 70f of a first barrier spring 70 described later.

  The front end surface 31A of the inward flange portion 31 of the rectilinear frame 30 is opened and closed with respect to the opening 30B. Specifically, at least a part of the optical path of the first group lens, the second group lens, and the third group lens which are photographing optical systems is blocked A pair of first barrier blades 70 are disposed to move to a closed position where the first barrier blade 70 is moved and an open position where the light is retracted from the optical path. In the present embodiment, the pair of first barrier blades 70 blocks the optical path in the vicinity of the optical axis among the optical paths of the photographing optical system.

  Specifically, the pair of first barrier blades 70 is formed by a plate-like member having a partial arc shape, and is parallel to the optical axis direction of each first barrier blade 70 when moved to the closed position. One surface (hereinafter referred to as an inner peripheral surface) 70g is formed in a shape that engages and seals with each other.

  A shaft hole 70 a is formed at one end of the first barrier blade 70, and the distal end side of the barrier shaft 50 a of the barrier driving member 50 fitted into the support portion 110 a of the barrier opening spring 110 is inserted into the shaft hole 70 a. Inserted.

  At this time, in the open position, the first barrier blade 70 has the spring accommodating portion 50i and the spring guide 50g of the barrier driving member 50, the barrier opening spring 110, the rail portion 31b, the fitting groove 31c, the closing spring shaft 35, and the closing spring. The hook 36 and the barrier closing spring 120 are disposed inside the rectilinear frame 30 so as to cover the front of the barrier closing spring 120 in the optical axis direction so as not to shield the opening 30B. Therefore, the first barrier blade 70 prevents dust and the like from entering the support portions of the barrier opening spring 110 and the barrier closing spring 120.

  Furthermore, in the open position, the other surface (hereinafter referred to as the outer peripheral surface) 70 h parallel to the optical axis direction of the first barrier blade 70 is an open position that is an open position restricting portion formed in the rectilinear frame 30. It is in contact with the stopper 31d.

  A blade drive pin 70d extending forward in the optical axis direction is formed on the surface in the vicinity of the axial hole 70a and on the front side in the optical axis direction.

  Furthermore, the surface of the first barrier blade 70 on the side where the second barrier blade 80 described later is disposed is the other end of the first barrier blade 70 and the outer peripheral surface 70 h of the first barrier blade 70. A thrust receiving portion 70e that receives the tip of a second blade 80, which will be described later, in the radial direction and prevents the second blade 80 from tilting with respect to the optical axis direction is formed.

  In addition, the periphery of the shaft hole 70a of the first barrier blade 70 is also formed so as to protrude by the same height as the thrust receiving portion 70e in the optical axis direction, and the second surface is formed on the surface formed around the shaft hole 70a. The barrier blade 80 is prevented from tilting. In other words, the second barrier blade 80 is formed in the optical axis direction by the thrust receiving portion 70e formed at the peripheral portion of the shaft hole 70a of the first barrier blade 70 and the tip portion of the first barrier blade 70. The position is regulated.

  Also, the movable arm of the barrier opening spring 110 is located on the surface of the first barrier blade 70 on the side where the barrier driving member 50 is disposed, at a position substantially opposite to the blade driving pin 70d and closer to the outer peripheral surface 70h. A cylindrical opening spring hook 70c to which the tip of the arm portion 110c is locked is formed so as to protrude to the side where the barrier driving member 50 is disposed.

  The tip of the opening spring hook 70c is inserted into the insertion groove 31c of the inward flange portion 31 of the rectilinear frame 30, and slides in the insertion groove 31c. Therefore, the first barrier blade 70 can be biased toward the open position by the barrier opening spring 110.

  Further, the rail portion 31b formed on the front end surface 31A of the inward flange portion 31 of the rectilinear frame 30 is the surface on the flange portion 31 side of the first barrier blade 70 and in the vicinity of the other end direction of the opening spring hook 70c. A thrust receiving portion 70b that abuts and slides against the optical axis to prevent the first barrier blade 70 from tilting with respect to the optical axis direction connects the end portion on the inner peripheral surface 70g side and the end portion on the outer peripheral surface 70h side. And has a partial arc shape so as to protrude toward the flange portion 31 side.

  Further, the first barrier blade 70 is disposed on the surface of the first barrier blade 70 on the side where the barrier closing spring 120 is disposed, near the inner peripheral surface 70g in the vicinity of the other end direction of the thrust receiving portion 70b. When moved to the closed position, a columnar closing spring hook 70f that engages the tip of the arm portion of the movable arm 120c of the barrier closing spring 120 is formed so as to protrude to the side where the barrier closing spring 120 is disposed. ing. For this reason, the first barrier blade 70 is always urged to be in the closed position by the barrier closing spring 120.

  A pair of second barrier blades 80 is disposed in front of the pair of first barrier blades 70 in the optical axis direction. Specifically, the pair of second barrier blades 80 is formed of a plate-like member having a partial arc shape.

  A shaft hole 80 a is formed at one end of the second barrier blade 80, and the support portion 110 a of the barrier opening spring 110 and the support portion 70 a of the first barrier blade 70 are inserted into the shaft hole 80 a. The tip of the barrier shaft 50a of the barrier driving member 50 is inserted.

  The second barrier blade 80 is parallel to the optical axis direction and includes an inner peripheral surface 80g on the optical axis side and an outer peripheral surface 80h parallel to the optical axis direction and opposite to the optical axis. Have. Further, a long hole 80d is formed in the vicinity of the shaft hole 80a. The longitudinal direction of the long hole 80d is formed along the direction connecting the inner peripheral surface 80g and the outer peripheral surface 80h. The outer peripheral surface 80h side of the long hole 80d constitutes a first contact portion 80d1, and the inner peripheral surface 80g side of the long hole 80d constitutes a second contact portion 80d2.

  A blade driving pin 70d of the first barrier blade 70 is fitted into the long hole 80d. At this time, when the second barrier blade 80 is in the open position, the blade driving pin 70d is in contact with the first contact portion 80d1 of the long hole 80d.

  The second barrier blade 80 is opened and closed by a blade driving pin 70d, which will be described later. That is, the second barrier blade 80 opens and closes in conjunction with the opening and closing movement of the first barrier blade 70.

  A barrier decoration (front member) 90 is disposed in front of the pair of second barrier blades 80 in the optical axis direction, and the barrier decoration (front member) 90 is disposed at the inner end of the rectilinear frame 30. ing.

  Specifically, the barrier decoration (the front member 90 is formed of a disk having an opening 90B. The opening 90B is formed when the barrier decoration (front member) 90 is disposed on the rectilinear frame 30. The four corners have a large circular rectangle so as to cover the outer periphery of the opening 30B.

  In the vicinity of the outer periphery of the opening 90B of the barrier decoration (front member) 90, a pair of boss holes 90b symmetric with respect to the optical axis O inserted into the engagement convex portion 32 of the inward flange portion 31 are formed. Yes. In addition, a pair of insertion holes 90a that are point-symmetric about the optical axis O disposed at a position facing the screw hole 33 of the inward flange portion 31 are formed in the vicinity of the pair of boss holes 90b.

  The screw 95 is inserted into the pair of insertion holes 90 a, and the screw 95 is screwed into the screw hole 33 of the inward flange portion 31, whereby the barrier decoration (front member) 90 is fixed to the front end portion of the rectilinear frame 30. ing.

  The outer peripheral surface 90h of the barrier decoration (front member) 90 is in contact with and in close contact with the inner peripheral surface of the rectilinear frame 30, and the front surface of the barrier decoration (front member) 90 in the optical axis direction is straight. The front end surface 30A of the frame 30 and the front in the optical axis direction have the same height.

  The arrangement and materials of the evaporation promoting member / attracting member / connecting member will be described. As shown in FIG. 9, the evaporation promoting member A201 is bonded and fixed to the rear surface in the optical axis direction of the barrier decoration (front member) 90 in a donut shape over the entire circumference of the opening 90B. The evaporation promoting member A201 has a thickness of about 0.3 mm and is made of a rayon fiber or a polyester fiber that has been impregnated with acrylic, and its structure is a non-woven fabric or a three-dimensional knitted structure. Therefore, when a water droplet adheres, the water droplet spreads in the surface of the evaporation promoting member A201. In FIG. 9, the root portion 202a of the attracting member A202 is fixed below the evaporation promoting member A201. The middle portion 202b of the attracting member A202 is bent about 90 degrees. The leading end 202c of the attracting member A202 is in contact with the inner peripheral surface 30e of the rectilinear frame 30 as shown in the lower part of FIG.

  Similarly, in FIG. 9, the attracting member B203 and the attracting member C204 are fixed to the left and right of the evaporation promoting member A201, the intermediate portion 203b of the attracting member B203 is woven about 90 degrees, and the leading end portion 203c is within the rectilinear frame 30. It is in contact with the peripheral surface 30e.

  In FIG. 10, the evaporation promoting member C205 is bonded and fixed to the rear surface of the upper second barrier blade 80 in the optical axis direction. The root portion 206a of the attracting member B206 is fixed to a part of the evaporation promoting member B205, and the tip portion 206c is in contact with the surface of the evaporation promoting member A201 as shown in FIG.

  Similarly, an evaporation promoting member C207 is bonded and fixed to the rear surface of the lower second barrier blade 80 in the optical axis direction. The root portion 208a of the attracting member C208 is fixed to a part of the evaporation promoting member C207, and the distal end portion 208c is in contact with the surface of the evaporation promoting member A201 as shown in FIGS.

  In FIG. 11, an evaporation promoting member D209 is bonded and fixed to the surface of the upper first barrier blade 70 on the rear side in the optical axis direction. The root portion 210a of the connecting member D210 is fixed to a part of the evaporation promoting member D209, the intermediate portion 210b is bent by about 45 degrees, and the tip portion 210c is the second barrier blade 80 as shown in FIGS. Is in contact with the surface of the evaporation promoting member B205 fixed to the back surface of the plate.

  Similarly, an evaporation promoting member E211 is bonded and fixed to the rear surface of the lower first barrier blade 70 in the optical axis direction. The base portion 212a of the connecting member E212 is fixed to a part of the evaporation promoting member E211, the intermediate portion 212b is bent about 45 degrees, and the tip portion 212c is formed on the lower second barrier blade 80 as shown in FIG. In contact with the surface of the evaporation promoting member C207 which is fixed to the back surface.

  The attracting member A202, the attracting member B203, the attracting member C204, the evaporation promoting member B205, the attracting member B206, the evaporation promoting member C207, the attracting member C208, the evaporation promoting member D209, the connecting member D210, the evaporation promoting member E211, and the connecting member E212 are thick. The thickness is 0.1 mm to 0.3 mm, and the material is rayon fiber or polyester fiber impregnated with acrylic, and the structure is a non-woven fabric or a three-dimensional knitted structure. Therefore, when a water droplet adheres, the water droplet spreads within the member.

  The operation of the evaporation promoting member / attracting member / connecting member in the retracted state will be described. Next, in the photographing state of FIG. 14 (the gravity direction is in the −Y direction), a water droplet 220 due to rain, water splashing from the pool, etc. passes through the path C shown in the figure and is inside the front surface of the lens barrel 1. When the user turns off the power supply of the imaging apparatus while the lens barrel 1 in FIG. 12 is retracted in a state where the imaging apparatus accumulates below (in the direction of gravity) the inner peripheral surface 30e of a certain rectilinear frame, the imaging apparatus The operation of the present embodiment when the camera is left so that the −Y direction in FIG.

  Immediately after the collapse, it is assumed that the water droplets 220 are accumulated below (in the direction of gravity) the inner peripheral surface 30e of the rectilinear frame in FIG. The water droplets are schematically illustrated, and the water droplets are discretely attached over the entire inner circumferential surface of the straight cylinder, and in particular, a large amount of water droplets are accumulated below the inner circumferential surface 30e of the linear frame due to the influence of gravity. is there.

  Since the water droplet 220 is in contact with the tip portion 202c of the attracting member A202, the water droplet 202 is absorbed by the tip portion 202c and reaches the root portion 202a through the intermediate portion 202b. Further, the water droplet 202 spreads on the donut-shaped surface of the evaporation promoting member A201 to which the root portion 202a is fixed.

  When water droplets 220 remain below the inner peripheral surface 30e of the rectilinear frame, the water droplets of the evaporation promoting member A201 are in contact with the tip of the attracting member B206 that is in contact with the evaporation promoting member A201 as shown in FIG. It is transmitted from 206c to the root portion 206a and spreads to the evaporation promoting member B205 on the upper second barrier blade 80 to which the root portion 206a is fixed. Further, as shown in FIG. 12, the water droplets spread on the evaporation promoting member B205 are guided to the root part 210a from the tip part 210c of the connecting member D210 that is in contact with the surface of the evaporation promoting member B205, and the root part 210a contacts. The surface of the evaporation promoting member D209 that is bonded and fixed to the upper first barrier blade 70 is expanded.

  Further, as shown in FIGS. 12 and 16, the water droplets on the evaporation promoting member A201 are transmitted from the distal end portion 208c of the attracting member C208 that is in contact with the evaporation promoting member A201 to the root portion 208a. It spreads to the evaporation promoting member C207 on the fixed second barrier blade 80 on the lower side. Further, the water droplets spread on the evaporation promoting member C207 are guided to the root portion 212a from the tip end portion 212c of the connecting member E212 that is in contact with the surface of the evaporation promoting member C207, and the lower second contact portion with which the root portion 212a is in contact. The surface of the evaporation promoting member E211 bonded and fixed to one barrier blade 70 is spread.

  As described above, the water droplets accumulated below the inner peripheral surface 30e of the rectilinear frame spread in order to the evaporation promoting member A201, the evaporation promoting member B205, the evaporation promoting member C207, the evaporation promoting member D209, and the evaporation promoting member E211. Thus, drying increases as the ratio of the total surface area to the total volume of water drops increases. The first barrier blade 70 and the second barrier blade 80 are closed, but the water vapor from which water droplets have evaporated from the gap between the barrier blades and the gap between the barrier blade and the barrier decoration (front member) 90 It is possible to go outside.

  The above description is the effect of this embodiment when the posture of the imaging apparatus is left at the normal position (the gravity direction is the −Y direction).

  Next, the effect of the present embodiment when left in the vertical position (the gravity direction is the + Z direction) on the grip of the imaging apparatus will be described.

  Since the + Z direction becomes the gravity direction, the water droplet 220 depicted in FIG. 12 moves in the + Z direction along the inner peripheral surface 30e of the straight cylinder. Therefore, the leading end portion 204c of the attracting member C204 shown in FIGS. 9 and 16 comes into contact with the moved water droplet 220. Therefore, the water droplet 202 is absorbed by the tip end portion 204c, and reaches the root portion 204a through the intermediate portion 204b. Further, the water droplet 202 spreads on the donut-shaped surface of the evaporation promoting member A201 to which the root portion 204a is fixed. Subsequent movement of the water droplet is the same as that when the posture of the imaging device is left at the normal position (the gravity direction is the -Y direction).

  Next, the effect of this embodiment when left in a vertical position (gravity direction is in the −Z direction) under the grip of the imaging apparatus will be described.

  Since the −Z direction is the gravity direction, the water droplet 220 depicted in FIG. 12 moves in the −Z direction along the inner peripheral surface 30e of the straight cylinder. Therefore, in FIG. 9 and FIG. 16, the distal end portion 203 c of the attracting member B 203 comes into contact with the moved water droplet 220. Therefore, the water droplet 202 is absorbed by the distal end portion 203c and reaches the root portion 203a through the intermediate portion 203b. Further, the water droplet 202 spreads on the donut-shaped surface of the evaporation promoting member A201 to which the root portion 203a is fixed. Subsequent movement of the water droplet is the same as that when the posture of the imaging device is left at the normal position (the gravity direction is the -Y direction).

  Next, the movement of the lens barrel 1 configured as described above from the retracted position to the photographing position and the movement from the photographing position to the retracted position will be described with reference to FIGS.

  3 is a front view of the lens barrel when the lens barrel of FIG. 1 is viewed from the direction III, FIG. 4 is a cross-sectional view showing a photographing position of the lens barrel of FIG. 1, and FIG. 6 is a front view of the lens barrel as seen from the direction of V, FIG. 6 is a cross-sectional view showing a position at which the second barrier blade 80 of the lens barrel of FIG. 1 starts to close, and FIG. 6 is a front view of the lens barrel when the lens barrel of No. 6 is viewed from the direction of VII. FIG.

  As shown in FIG. 1, when the lens barrel 1 is in the retracted state, the rotary frame 20, the rectilinear frame 30 and the float key 40 are retracted inside the fixed frame 10. Therefore, the rectilinear frame 30 is located at the retracted position that is the first position. At this time, the pressing surfaces 40d1 of the pair of pressing portions 40d of the float key 40 are cam surfaces 50c of the shaft portion 50b of the barrier driving member 50 fitted into the pair of barrier shaft holes 37 of the inward flange portion 31 of the rectilinear frame 30. Are in contact with the front in the optical axis direction. In this state, the barrier driving member 50 has another direction opposite to one direction in the circumferential direction, which is a direction toward the position corresponding to the closed direction state of the first barrier blade 70 and the second barrier blade 80. It is rotated in the direction.

  Further, as shown in FIG. 3, the arm portion of the movable arm 120c of the barrier closing spring 120 in which the pair of closing spring shafts 35 of the inward flange portion 31 is inserted into the pair of support portions 120a is a pair of first barriers. The closing spring hook 70f of the blade 70 is urged so that the first barrier blade 70 is in the closed position.

  Accordingly, the pair of first barrier blades 70 are rotated to the closed position. That is, as shown in FIG. 3, the inner peripheral surfaces 70g of the pair of first barrier blades 70 are engaged with each other and are in close contact with each other to block the optical paths of the first group lens, the second group lens, and the third group lens.

  In addition, the second abutting portion 80d2 of the second barrier blade 80 is urged by the blade driving pin 70d of the first barrier blade 70 contacting and closing in the closing direction, thereby a pair of second barrier blades. 80 moves to the closed position shown in FIG. 3 and blocks the optical path of the first group lens, second group lens, and third group lens.

  In this state, the tip of the second barrier blade 80 is in contact with the opening spring hook 34. That is, the opening spring hooking portion 34 functions as a position restricting portion for the closed position of the second barrier blade 80.

  At this time, the movable arm 110c of the opening spring 110 is in contact with the spring pressing portion 50f of the barrier driving member 50, and an urging force for moving the first barrier blade 70 to the open position is stored.

  However, when the lens barrel 1 is retracted, the pressing surface 40d1 of the pressing portion 40d of the float key 40 is in contact with the cam surface 50c of the barrier driving member 50, so that the rotation of the barrier driving member 50 is restricted. . Therefore, the biasing force of the opening spring 110 is not transmitted to the first barrier blade 70, and the first barrier blade 70 is biased in the closing direction by the biasing force of the barrier closing spring 120.

  Therefore, for example, even when the first barrier blade 70 is intentionally moved to the open position by a finger or the like when the first barrier blade 70 is in the closed position, the finger is released from the first barrier blade 70. At the end, the first barrier blade 70 moves to the closed position, and the second barrier blade 80 moves to the closed position in conjunction therewith.

  When the motor drive source disposed on the outer periphery of the fixed frame 10 rotates and the male helicoid screw 20a of the rotating frame 20 rotates, as described above, the rotating frame 20 and the float key 40 are moved forward in the optical axis direction. Advances to, that is, protrudes.

  Further, the rectilinear frame 30 receives the rotation of the rotary frame 20, and the five rectilinear keys 30 b formed on the inner peripheral surface of the rectilinear frame 30 include the three rectilinear grooves 40 c and two of the float key 40. The straight groove 40e slides forward in the optical axis direction and protrudes forward in the optical axis direction.

Therefore, the lens barrel 1 moves from the retracted position shown in FIG. 1 to the photographing position shown in FIG. FIG. 4 is a diagram showing a tele state among the photographing positions. The first barrier blade 70 and the second barrier blade 80 are in the open position when the lens barrel 1 is in the wide state among the photographing positions, and are also opened when the lens barrel 1 is in the tele state. Maintaining position.
When the lens barrel 1 is moved from the retracted position to the photographing position, the pressing surfaces 40d1 of the pair of pressing portions 40d of the float key 40 are cam surfaces of the shaft portion 50b of the barrier driving member 50 pressing forward in the optical axis direction. Separated from 50c.

  As a result, the center of the arm portion of the movable arm 110c locked to the spring pressing portion 50f of the spring guide 50g of the barrier driving member 50 is connected to the spring pressing portion 50f by the first barrier blade 70 and the second barrier blade 80. Is urged in one circumferential direction, which is a direction toward the position corresponding to the open direction state. Therefore, the barrier driving member 50 is rotated in one circumferential direction, which is a direction toward the position corresponding to the open direction state of the first barrier blade 70 and the second barrier blade 80.

  At this time, the tip of the arm portion of the movable arm 110c of the barrier opening spring 110, which is engaged with the opening spring hook 70c of the first barrier blade 70 and has stored the urging force, is shown in FIG. The hook 70c is urged so that the first barrier blade 70 is in the open position.

  From this, the pair of first barrier blades 70 moves to the open position. That is, as shown in FIG. 5, the outer peripheral surfaces 70h of the pair of first barrier blades 70 are in contact with the opening position stopper 31d provided on the inner periphery of the rectilinear frame 30, and the inner peripheral surface 70g is the first group lens. , Retract from the optical path of the second group lens and third group lens. That is, the first barrier blade 70 is retracted from the optical path of the first group lens, the second group lens, and the third group lens.

Note that, when the first barrier blade 70 moves from the closed position to the open position, the thrust receiving portion 70 b of the first barrier blade 70 slides on the rail portion 31 b of the inward flange portion 31.
The pair of second barrier blades are urged by the first contact portion 80d1 of the second barrier blade 80 being urged by the blade driving pin 70d of the first barrier blade 70 contacting the opening direction. Reference numeral 80 is moved to the open position shown in FIG. 5, and retracts from the optical path of the first group lens, second group lens, and third group lens.

  In the open position, the outer peripheral surface 80 h of the second barrier blade 80 is in contact with an open position stopper 31 d provided on the inner periphery of the rectilinear frame 30.

  In the open position, the first barrier blade 70 is brought into the closed position on the arm portion of the movable arm 120c of the barrier closing spring 120 engaged with the closing spring hook 70f of the first barrier blade 70. The biasing force to rotate is stored.

  However, in the open position of the first barrier blade 70, the biasing force of the barrier opening spring 110 in the opening direction of the movable arm 110c is larger than the biasing force of the barrier closing spring 120 in the closing direction of the movable arm 120c.

  For this reason, for example, even when the first barrier blade 70 is intentionally moved to the closed position by a finger or the like when the first barrier blade 70 is in the open position, the finger is released from the first barrier blade 70. At the end, the first barrier blade 70 is moved to the open position, and the second barrier blade 80 is also moved to the open position in conjunction therewith.

  The mutual movement of the evaporation promoting member, the attracting member, and the connecting member when shifting from the retracted state to the photographing state will be described.

In the retracted state of FIGS. 12 and 16, the root portion 206a of the attracting member B206 is fixed to a part of the evaporation promoting member B205 fixed to the rear surface in the optical axis direction of the upper second barrier blade 80. The part 206c is in contact with the surface of the evaporation promoting member A201.
Similarly, the root portion 208a of the attracting member C208 is fixed to a part of the evaporation promoting member C207 fixed to the rear surface of the lower second barrier blade 80 in the optical axis direction, and the tip portion 208c is formed of the evaporation promoting member. It is in contact with the surface of A201.

  Further, the root portion 210a of the connecting member D210 is fixed to a part of the evaporation promoting member D209 fixed to the surface of the upper first barrier blade 70 in the optical axis direction, and the tip portion 210c is connected to the upper second barrier blade 70. The surface of the evaporation accelerating member B205 that is bonded and fixed to the surface of the barrier blade 80 is pressed against the surface.

  Similarly, the root portion 212a of the coupling member E212 is fixed to a part of the evaporation promoting member E211 fixed to the rear surface in the optical axis direction of the lower first barrier blade 70, and the tip portion 212c is The second barrier blade 80 is in pressure contact with the surface of the evaporation promoting member C207 that is bonded and fixed to the surface.

  Next, when only the first barrier blade 70 of FIG. 6 is visible from the retracted position of FIG. 1 and the second barrier blade 80 is not visible from the outside, as shown in FIGS. 16 to 17. In accordance with the rotation of the barrier blade, the leading end portion 206c of the attracting member B206 that is in contact with the surface of the evaporation promoting member A201 rotates around the barrier shaft 50a that is the rotation center of the upper second barrier blade 80. Then, it slides from the surface of the evaporation promoting member A201 to the surface of the attracting member C204 fixed to the evaporation promoting member A201, and transfers.

  Similarly, the tip 208c of the attracting member C208 that is in contact with the surface of the evaporation promoting member A201 rotates around the barrier shaft 50a that is the rotation center of the lower second barrier blade 80, thereby promoting evaporation. The surface slides from the surface of the member A201 to the surface of the attracting member B203 fixed to the evaporation promoting member A201.

  The distal end portion 210a of the connecting member D210 that is in contact with the surface of the evaporation promoting member B205 rotates around the barrier shaft 50a that is the center of rotation of the upper first barrier blade 70, and moves toward the surface of the evaporation promoting member B205. The contact state is maintained.

  Similarly, the tip 212a of the connecting member E212 that is in contact with the surface of the evaporation promoting member C207 rotates about the barrier shaft 50a that is the center of rotation of the lower first barrier blade 70, and the evaporation promoting member The state of contact with the C207 surface is maintained.

  Furthermore, when only the first barrier blade 70 in FIG. 6 is visible to the outside and the second barrier blade 80 is not visible from the outside to the photographing position in FIG. 4, as in FIGS. 17 to 18, As the barrier blades rotate, the leading end portion 206c of the attracting member B206 that is in contact with the surface of the evaporation promoting member A201 rotates about the barrier shaft 50a that is the rotation center of the upper second barrier blade 80. Then, the surface of the attracting member C204 is slid.

  Similarly, the leading end portion 208c of the attracting member C208 that is in contact with the surface of the evaporation promoting member A201 rotates about the barrier shaft 50a that is the center of rotation of the lower second barrier blade 80, thereby attracting member B203. Slide on the surface.

  The tip 210a of the connecting member D210 that is in contact with the surface of the evaporation promoting member B205 rotates around the barrier shaft 50a that is the center of rotation of the upper first barrier blade 70, while evaporating as shown in FIG. It will be in a non-contact state away from the surface of promotion member B205.

  Similarly, the distal end portion 212a of the connecting member E212 that is in contact with the surface of the evaporation promoting member C207 rotates around the barrier shaft 50a that is the center of rotation of the lower first barrier blade 70, as shown in FIG. Similarly, it will be in the non-contact state away from the evaporation promotion member B205 surface.

  When the lens barrel 1 is moved again from the photographing position to the retracted position, the motor drive source disposed on the outer periphery of the fixed frame 10 moves the rectilinear frame 30 from the retracted position to the photographing position. It rotates in the opposite direction. Accordingly, when the male helicoid screw 20a of the rotating frame 20 rotates, as described above, the rotating frame 20 and the float key 40 are retracted, that is, retracted, rearward in the optical axis direction.

At this time, the rectilinear frame 30 receives the rotation of the rotary frame 20, and the five rectilinear keys 30 b formed on the inner peripheral surface of the rectilinear frame 30 are replaced by the three rectilinear grooves 40 c and the two rectilinear grooves 40 c of the float key 40. The rectilinear groove 40e slides backward in the optical axis direction to retract in the rear in the optical axis direction.
Accordingly, the lens barrel 1 moves from the photographing position shown in FIG. 4 to the retracted position shown in FIG. 1 through the position shown in FIG.

  Specifically, when the lens barrel 1 is moved from the photographing position to the retracted position, the rectilinear frame 30 protruding forward in the optical axis direction retracts inside the fixed frame 10 together with the rotating frame 20. At this time, as shown in FIG. 6, the pressing surfaces 40 d 1 of the pair of pressing portions 40 d of the float key 40 come into contact with the cam surface 50 c of the shaft portion 50 b of the barrier driving member 50 and start pressing forward in the optical axis direction. Then, when the cam surface 50c is pressed against the pressing surface 40d1 of the pressing portion 40d, the barrier driving member 50 rotates against the biasing force of the barrier opening spring 110.

  At this time, the arm portion of the movable arm 120 c of the barrier closing spring 120 in which the pair of closing spring shafts 35 of the inward flange portion 31 is inserted into the pair of support portions 120 a is applied to the closing spring of the pair of first barrier blades 70. 70f starts to be urged so that the first barrier blade 70 is in the closed position.

  From this, the pair of first barrier blades 70 starts to move in the direction of the closed position. That is, the pair of first barrier blades 70 have inner peripheral surfaces 70g engaged and in close contact with each other as shown in FIG. 3 so as to block the optical paths of the first group lens, the second group lens, and the third group lens. Start moving to the closed position.

  When the pair of barrier blades 70 have moved to the positions shown in FIG. 7, the pair of the pair of barrier blades 70 that have been in contact with and urged against the first contact portions 80d1 of the pair of second barrier blades 80 in the open position. The blade driving pin 70d of the first barrier blade 70 contacts the second contact portion 80d2 of the pair of second barrier blades 80 and starts to be biased.

  As a result, the pair of second barrier blades 80 starts to rotate in the direction of the closed position. Thereafter, the lens barrel 1 is moved from the position shown in FIG. 6 to the retracted position shown in FIG. 1, and the rectilinear frame 30 protruding forward in the optical axis direction retracts inside the fixed frame 10 together with the rotating frame 20. .

Even when the first barrier blade 70 moves from the open position to the closed position, the thrust receiving portion 70 b of the first barrier blade 70 slides on the rail portion 31 b of the inward flange portion 31.
Further, when the rectilinear frame 30 receives the rotation of the rotary frame 20 and retracts with respect to the float key 40, the rectilinear frame 30 has five rectilinear keys 30b formed on the inner peripheral surface of the rectilinear frame 30. The float key 40 is retracted rearward in the optical axis direction by slidingly moving the three rectilinear grooves 40c and the two rectilinear grooves 40e rearward in the optical axis direction.

  At this time, the load for driving the barrier driving member 50 includes a force in a direction to rotate the float key 40 around the optical axis via the pressing surface 40d1 of the pressing portion 40d, and the float key 40 in the optical axis direction. It is transmitted as a force to displace

  However, the bayonet claw 40b of the float key 40 formed substantially coaxially with the position where the pressing portion 40d is formed and the optical axis direction receives a force in the optical axis direction, and the position and light where the pressing portion 40d is formed. Since the pair of rectilinear grooves 40e formed on substantially the same axis along the axial direction assists in receiving a force around the optical axis, the float key 40 is not deformed.

  That is, since the load for rotating the barrier driving member 50 is received by the bayonet claw 40b and the rectilinear groove 40e disposed in the vicinity of the pressing portion 40d to which the load is applied, the float key 40 can be prevented from being deformed.

  As described above, in one embodiment of the present invention, the pair of first barrier blades 70 is opened and closed by the shafts of the pair of barrier driving members 50 that are rotatably fitted in the barrier shaft holes 37 of the rectilinear frame 30. The contact was made between the cam surface 50c of the portion 50b and the pressing surfaces 40d1 of the pair of pressing portions 40d formed at the tip end of the float key 40 in the optical axis direction.

  Further, the opening and closing of the second barrier blade 70 is interlocked with the opening and closing of the first barrier blade 70 by using the blade driving pin 70 d of the first barrier blade 70 and the long hole 80 d of the second barrier blade 80. To open and close.

  Further, the shaft hole 70 a of the first barrier blade 70 and the shaft hole 80 a of the second barrier blade 80 are inserted into the barrier shaft 50 a of the barrier driving member 50.

  Furthermore, the barrier drive member 50 is provided with a spring accommodating chamber 50i for the barrier opening spring 110, and the barrier opening spring 110 is disposed on the rotation axes of the first barrier blade 70 and the second barrier blade 80. Yes.

  Further, the periphery of the barrier opening spring 110 is substantially covered with the spring guide 50g, and further, the periphery of the shaft hole 70a of the first barrier blade 70 is disposed so as to be in contact with the end face of the spring guide 50g. Therefore, the support portion 110 a that is the coil portion of the barrier opening spring 110 is covered with the spring guide 50 g and the first barrier blade 70. Thereby, there is no possibility that dust etc. may invade into the support portion 110a which is the coil portion of the barrier opening spring 110, and a stable opening / closing operation is performed.

  Further, the shaft portion 50 b of the barrier driving member 50 is fitted on the inner peripheral surface of the barrier shaft hole 37 via an O-ring 55 so as to be rotatable. Therefore, since the inner peripheral surface of the barrier shaft hole 37 and the outer peripheral surface of the shaft portion 50b are kept watertight by the O-ring 55, dust, water droplets, etc. are mixed into the rectilinear frame 30 with a simple structure. Can be prevented.

As described above, by absorbing and diffusing water droplets that have entered the inner peripheral surface 30e of the rectilinear frame that is on the front side from the inside of the rectilinear frame 30 that can prevent dust, water droplets, and the like from being mixed, on the evaporation promoting member. It is possible to expedite the evaporation of water droplets, to prevent the water droplets from flowing out of the lens barrel during non-photographing, and to reduce the corrosion of the lens barrel components.
In addition, a plurality of evaporation promoting members are arranged on the barrier decoration (front member), the first barrier blade, and the second barrier blade, and in the retracted position in the non-photographing state, they are viewed from the optical axis direction. By evaporating a plurality of evaporation promoting members so as not to overlap and expanding the total surface area, it is possible to increase the evaporation rate into the atmosphere.

  Further, in the photographing state, the plurality of evaporation promoting members together with the first barrier blade and the second barrier blade overlap with each other when viewed from the optical axis direction and retract from the photographing optical path so as not to disturb the photographing. ing.

  Furthermore, since the plurality of evaporation promoting members are connected by the attracting member or the connecting member, the water droplets of the wet evaporation promoting member can move to other already dried evaporation promoting members, It becomes possible to shorten the drying time of the evaporation promoting member.

DESCRIPTION OF SYMBOLS 1 ... Lens barrel, 20 ... Rotating frame (3rd frame), 20c ... Circumferential groove | channel (thrust position control part),
30 ... Linear frame (first frame), 30b ... Linear key (rotation stop), 30B ... Opening,
30e ... inner peripheral surface, 31 ... inward flange portion, 40b ... bayonet claw (engagement portion),
40f ... Bayonet claw (engagement part), 40 ... Float key (second frame),
40d ... Pressing part, 40c ... Linear groove (guide part), 50a ... Barrier shaft (barrier shaft part),
50 ... barrier driving member, 55 ... O-ring (preventing member),
61 ... 1 group lens (imaging optical system), 70 ... first barrier blade (barrier blade),
80 ... second barrier blade (other barrier blade), 90 ... barrier decoration (front member),
90B ... opening, 110 ... barrier opening spring (open biasing member),
120: Barrier closing spring (closing biasing member), O: Optical axis,
201 ... evaporation promoting member A (first evaporation promoting member),
202 ... attracting member A (first attracting member),
203 ... Attraction member B (first attraction member),
204 ... Attraction member C (first attraction member),
205 ... Evaporation promoting member B (second evaporation promoting member),
206 ... attracting member B (second attracting member),
207 ... evaporation promoting member C (second evaporation promoting member),
208 ... Attraction member C (second attraction member),
209 ... evaporation promoting member D (second evaporation promoting member),
210 ... connecting member D,
211 ... Evaporation promoting member E (second evaporation promoting member),
212 ... connecting member E,
220 ... water drops

Claims (5)

Photographic optics,
A first frame for holding the photographing optical system;
In the lens barrel having a front member fixed to the subject side front surface of the first frame and having an opening smaller than the diameter of the first frame,
A first evaporation promoting member made of a water absorbing material is disposed on the front member,
A lens barrel characterized by comprising a first attracting member for attracting water from the inner diameter portion of the first frame to the evaporation promoting member. Between the photographing optical system and the front member, a plurality of barrier blades that can advance and retreat with respect to the optical path of the photographing optical system are disposed,
A second evaporation promoting member is disposed on one or more of the plurality of barrier blades, and water is supplied from the first evaporation promoting member or the first attracting member to the second evaporation promoting member. The lens barrel according to claim 1, wherein a second attracting member for attracting is arranged.   A plurality of barrier blades capable of moving back and forth with respect to the optical path of the photographing optical system are disposed between the photographing optical system and the front member, and each of the plurality of barrier blades includes a second evaporation promoting member. The lens barrel according to claim 1, wherein a connecting member made of a water-absorbing material that connects the second evaporation promoting members is arranged. When the plurality of barrier blades are retracted from the optical path of the photographing optical system, the first evaporation promotion member and the plurality of second evaporation promotion members are overlapped when viewed from the optical axis direction. When the plurality of barrier blades enter the optical path of the photographing optical system,
4. The lens barrel according to claim 2, wherein the first evaporation promotion member and the plurality of second evaporation promotion members are not substantially overlapped when viewed from the optical axis direction. 5. .   An imaging apparatus comprising the lens barrel according to any one of claims 1 to 4.