JP4632763B2 - Lens barrel - Google Patents

Description

  The present invention relates to a lens barrel having three frame members coupled so as to be capable of relative rotation and advance / retreat.

Conventionally, with respect to a lens barrel having a frame member coupled by a bayonet mechanism, the one disclosed in Patent Document 1 relates to a lens barrel that can be made compact and can be reliably driven forward and backward. In this lens barrel, a rectilinear guide member is coupled to a cam frame that can be rotated and advanced by a bayonet mechanism, and the rectilinear guide member is axially controlled in a rotation-restricted state with respect to the cam frame that rotates and retreats. Both are driven forward and backward.
Patent document 1 is Unexamined-Japanese-Patent No. 2003-255212.

  However, in the lens barrel disclosed in Patent Document 1 described above, the circumferential groove (bayonet groove) provided in the rectilinear guide member and the cam frame has a function of simply guiding the bayonet claw in the circumferential direction. It was a thing, and it was not equipped with other functions.

  The present invention has been made in view of the above-described situation, and an object thereof is to provide a small lens barrel that effectively uses a circumferential groove (bayonet mechanism) provided in the lens barrel.

The lens barrel according to claim 1 of the present invention is formed in a cylindrical shape, has a convex portion extending in the radial direction, has a first frame having a cam groove, a first cam follower, and the cam groove. A second frame having a second cam follower sliding with the cam groove and moving in the axial direction of the cylindrical shape relative to the first frame, and the second frame. a straight groove you drive the said first cam follower circumferentially for driving in the axial direction, to move in the axial direction together with the first frame, in order to rotate relative to the first frame It has a circumferential groove that fits and slides on the convex part, and the straight groove is provided continuously from the circumferential groove, so that the first cam follower can relatively move in the straight groove. It characterized that you have and a such third frame.

  A lens barrel according to a second aspect of the present invention is the lens barrel according to the first aspect, wherein a plurality of the first cam followers are provided, a plurality of the rectilinear grooves corresponding to the first cam followers are provided, and the rectilinear advance One of the grooves intersects the circumferential groove.

  A lens barrel according to a third aspect of the present invention is the lens barrel according to the first aspect, wherein a plurality of the convex portions are provided, and one of the convex portions is the remaining convex portion in the axial direction. Provided at different positions, the circumferential groove is further provided at a position corresponding to the one convex portion.

  According to the present invention, there is provided a small lens barrel that can effectively use a circumferential groove (bayonet mechanism portion) and a rectilinear groove provided in a lens barrel and can drive and control other frame members. Can do.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view including an optical axis in a state where a barrier of a camera having a lens barrel according to an embodiment of the present invention is closed and the lens barrel is retracted. 2 to 5 are exploded perspective views of the camera, FIG. 2 is an exploded perspective view of a barrier device including a front cover, a lens barrier, and a barrier driving unit, and FIG. 3 is a front body, a fixing frame, and a driving unit. FIG. 4 is an exploded perspective view of a part of the lens barrel, and FIG. 5 is an exploded perspective view of another part of the lens barrel. FIG. 6 is a perspective view of the barrier device with the barrier cap removed, as viewed from the front side. FIG. 7 is a perspective view of the barrier device as seen from the back side. FIG. 8 is a front view of the barrier device. FIG. 9 is a rear view of the barrier device. FIG. 10 is a front view of the camera with the front metal cover removed with the lens barrier closed. FIG. 11 is a front view of the state shown in FIG. 10 with the barrier cap further removed. FIG. 12 is a front view of the camera with the front metal cover removed with the lens barrier open. 13 is a cross-sectional view taken along the line AA in FIG. FIG. 14 is a front view showing one operation state of the barrier unit, and shows a state when the movement of the lens barrier in the closing direction is inadvertently prevented by an external force.

  In the following description, the photographing lens optical axis of the camera of the present embodiment is O, and the direction parallel to the optical axis O is the Z direction. The subject side in the Z direction is the front side, and the imaging side is the rear side (back side). The left-right direction perpendicular to the Z direction is the X direction, and the left-right direction is indicated by the direction viewed from the subject side (front side). The rotation direction is indicated by a counterclockwise direction or a clockwise direction as viewed from the subject side.

  The camera 1 of the present embodiment is a waterproof camera with a barrier having a retractable lens incorporating a CCD as an image sensor and a zoomable lens barrel, and each camera built-in member such as the drive unit 4 is housed as shown in FIG. A front main body 5 and a rear main body 6 having a lens opening 5a are disposed as a frame member (camera main body). A front metal cover 7 made of an aluminum alloy as an exterior member having a lens opening 7a that is a photographing lens opening window is fixed to the front surface of the front main body 5 with an adhesive or by screws. The rear metal cover 9 made of an aluminum alloy as an exterior member having an LCD display window is fixed by adhesion or screws. Further, between the front metal cover 7 and the rear metal cover 9, an intermediate metal cover 8 made of a strip-shaped aluminum alloy or the like is disposed as an exterior member at a part of the periphery. Also, an openable / closable external terminal / memory card lid 11 is disposed at the left end of the front main body 5.

  It is assumed that the periphery of the lens opening 7a of the front metal cover 7 forms an inclined surface in which the right side in the X direction is slightly inclined backward in the Z direction.

  Inside the front main body 5 and the rear main body 6, zooming and focusing can be performed at a position to the right of the X direction, and a retracted position that is a storage position that cannot be photographed, and a photographing position that is extended from the retracted position, A lens barrel 3 including a lens driving device that moves forward and backward on a lens movement trajectory between and a zoom driving unit 4 for driving the barrier device 2 including the lens barrel 3 and the lens barrier are built in and held. Furthermore, the electric circuit boards 12 and 13 from the front side on the left side in the X direction, the recording medium slot 14 mounted on the board 13, the main power supply battery 17 stored in the battery storage chamber, and the like are arranged in the inside, A strobe main capacitor 15 is housed in a gap between the right side of the lens barrel 3 and the front body 5, and an LCD 16 is disposed inside the LCD display window of the rear body 6. In the space between the front main body 5 and the front metal cover 7, a barrier device 2 including a lens barrier 33 and a barrier driving unit for driving the lens barrier 33 is disposed.

  The joint between the front main body 5 and the rear main body 6 has a waterproof structure including the periphery of the lens barrel 3. And the said joint part of the front main body 5 and the rear main body 6 is formed with a convex and concave fitting part, and the string-like packing 18 is wound around the fitting part for at least one turn, and is sandwiched. The joint is sealed. However, the front body 5 and the front metal cover 7 do not have a completely waterproof structure, and the barrier device 2 is housed inside the front metal cover 7, but members that are particularly problematic even if water drops enter. Not arranged.

  The zoom drive unit 4 includes a drive motor 41 as an electric drive source as shown in FIG. 3 and a gear train that is incorporated in a gear box fixedly supported by the front main body 5 with screws and driven by the drive motor 41. And a first output gear 42 driven by the gear train and a second output gear 43 driven in conjunction with the first output gear 42.

  The first output gear 42 meshes with a long gear-shaped lens barrel drive gear 44 disposed in the gear chamber 51 g of the fixed frame 51 of the lens barrel 3. The lens barrel drive gear 44 meshes with an outer peripheral gear portion 52a (FIG. 4) of the rotational movement frame 52 of the lens barrel 3 described later, and rotationally drives the rotational movement frame 52 to drive each component mirror of the lens barrel. The frame member (FIGS. 4 and 5) is driven forward and backward.

  A barrier drive gear 45 that meshes with the second output gear 43 is rotatably supported and built in the gear box. The barrier device 2 is driven via the barrier drive gear 45. The barrier drive gear 45 has an output shaft end portion 45a having a non-circular cross section whose fitting angle can be specified, and is coupled to the barrier device drive pinion 23 via a rotary shaft member 21 described later.

  The drive motor 41 performs rotational advance / retreat driving from the retracted state of the lens barrel 3 to the photographing state (or the reverse direction state) via the barrel drive gear 44 and the rotational movement frame 52 (FIG. 4). The barrier device 2 is opened / closed via the barrier drive gear 45, the pinion 23, and the drive ring 24 (FIG. 2), and the rotational movement frame 52 and the drive ring 24 are in an interlocking relationship.

  Details will be described later with reference to a development view of the operation state of the fixed frame / rotation movement frame in FIG. 22 and a development view of the operation state of the rotation movement frame / straight advance frame / cam frame in FIG. P0 is the initial rotational position (barrier closed / collapsed position) of the rotary moving frame 52 when the lens barrel 3 is in the retracted state and the lens barrel 3 is in the retracted state. 52 rotates by a rotation angle θ0 for preparation for feeding (barrier opening) and reaches the barrier opening / collapse position P1 at which feeding starts (development view in FIG. 22). Thereafter, when the rotational moving frame 52 is rotated by the rotation angle θ1 from the start to the end of the lens barrel, the barrier opening / collapse position P2 which is the extension end rotation position (that is, the wide position) is reached. Further, when the rotary moving frame 52 is rotated by the rotation angle θ2 (zoom rotation angle), the barrier opening / zoom position (tele) P3 is reached. The rotational movement frame 52 is driven by the drive motor 41 by a total rotation angle for the above-described preparation, extension, and zooming operation of the lens barrel 3, that is, θ0 + θ1 + θ2. In conjunction with the rotation of the frame 52, the drive ring 24 is rotated by an angle corresponding to the rotation angle θ0 + θ1 + θ2 through the barrier drive gear 45 and the pinion 23.

  As described above, the barrier device 2 includes the lens barrier 33 which is a barrier member as a driven portion shown in FIG. 2 and the barrier driving portion as driven portion driving means (barrier driving means).

  The lens barrier 33 is a disk-shaped resin molding member to which a barrier cap 34 is fixed by adhesion to the front surface portion thereof, and is driven by the driving force of the driving motor 41 via the second output gear 43 and the barrier driving unit. It is slid along the X direction. The slide movement position is a facing position on the optical axis O facing the front surface of a lens frame (such as the rotationally moving frame 52) including the first group lens 71 that is a photographing lens of the photographing lens barrel 3, and is a retracted position. A closed position that is a protection position (first position) that protects the photographing lens in the first position, and an open position that is a retracted position (second position) that is retracted from the front surface of the first group lens 71 and the rotary moving frame 52 and the like. Position. Further, as will be described later, when the lens barrier 33 is moved to the protection position, the left side of the lens barrier 33 is slightly rotated forward in the Z direction, the barrier cap 34 is fitted into the opening 7a, and the front surface is The front metal cover 7 moves so as to be flush with the front surface around the opening 7a.

  The lens barrier 33 is provided with an opening 33b at the center, two protrusions 33i protruding in the X direction around the optical axis O in the opening, and a front side of the protrusion along the X direction. The notched groove 33a, the slope 33d disposed at the left end of the hole 33e provided on the left side of the projection 33i, and the vertically spaced positions slightly away from the optical axis O. Two contact portions 33c protruding leftward are provided.

  The barrier cap 34 is a member made of a metal plate made of an aluminum alloy or the like, has a front-side circular protrusion that can be fitted into the lens opening 7a of the front metal cover 7, and extends along the periphery of the protrusion. The flange portion 34b is provided.

  As shown in FIG. 2, the barrier drive unit rotates around a rotating shaft member 21 as an external transmission member, a metal plate pinion 23 coupled to the rotating shaft member 21, a pinion pressing plate 25, and the front main body 5. A drive ring 24 that is held movably and meshes with a pinion 23 that constitutes a drive mechanism, a drive ring pressing plate 26, a slider 27 as a first member that can be engaged with the driving ring 24, and a slider pressing plate 28. A barrier lever 29 as a second member that rotates in conjunction with the slider 27, and a torsion spring 31 that is a biasing means that biases the barrier lever 29 and the slider 27 toward each other relatively. And a moving plate 32 that is supported by the barrier lever 29 so as to be slidable, and a guide shaft 35 that slides and guides the moving plate 32 along the X direction. It made.

  The rotating shaft member 21 is a small cylindrical shaft member arranged along the Z direction, and is a fitting hole that is inserted into the rear end of the output shaft end 45a of the barrier drive gear 45 in a relative rotation restricted state. A shaft hole portion 21c is provided, and an O-ring 22 that is a seal member is attached to a groove formed in the outer peripheral portion. Furthermore, a fitting convex portion 21b and a tip shaft portion 21a that are fitted in the shaft hole of the pinion 23 in a rotation restricted state are provided at the tip portion.

  As shown in the partial cross-sectional view of FIG. 13, the rotary shaft member 21 is rotatable in a state in which an O-ring 22 is sandwiched around the stepped through hole 5 e that is a through part disposed on the left side of the front body 5. It is supported in a state of being inserted and penetrated. The output shaft end portion 45a of the barrier drive gear 45 is fitted behind the rotary shaft member 21, and the pinion 23 is fitted together with the pinion 23 in the relative rotation regulation restricting state. The screw is inserted into the screw hole of the front main body 5 with the tip shaft 21a of the rotary shaft member 21 being rotatably fitted in the shaft hole 25a in a state where the pinion holding plate 25 restricts the forward movement of the pinion 23. It is screwed to 5 m and attached to the front main body 5.

  Accordingly, the rotation of the barrier drive gear 45 is transmitted to the pinion 23 disposed outside the front main body 5 in a state where the rotary shaft member 21 penetrates rotatably while being sealed by the O-ring 22.

  In addition, as described above, the through hole 5e of the front main body 5 is sealed from the outside of the front main body 5, so that the entire outer surface of the main body including the main body joint and other joints described above is sealed, At least the insides of the front main body 5 and the rear main body 6 are kept waterproof. Note that the space between the front surface of the front main body 5 where the constituent members of the barrier device 2 are arranged and the front metal cover 7 is not waterproofed, but the barrier device 2 itself needs to be particularly waterproofed. It is not particularly a problem because it is made up of non-members.

  The drive ring 24 is a member that is rotatably fitted to a drive ring fitting outer peripheral portion 5b disposed along the periphery (periphery) of the lens opening 5a at the center of the optical axis O of the front main body 5, and has a predetermined outer periphery. A gear part 24a provided in the angle range, and a notch part 24c and a projecting part 24d, which are engaging and releasing means, are provided on the outer peripheral part on the opposite side of the gear part 24a.

  The gear portion 24a meshes with the pinion 23. The predetermined angle range of the gear portion 24a is a total angle of the rotation angles θ0, θ1, and θ2 of the rotational movement frame 52 of the lens barrel described above by the drive motor 41. Is provided in a range that allows rotation by an angle corresponding to.

  A follower pin 27b of a slider 27, which will be described later, engages with the cutout portion 24c for a predetermined clockwise rotation period (a rotation angle corresponding to the rotation angle θ0 of the rotary moving frame 52) from the initial position of the drive ring 24. In further rotation, the engagement of the driven pin 27b is released from the notch 24c. When the drive ring 24 rotates counterclockwise, the drive ring 24 returns from the released state to the engaged state, and the drive ring 24 rotates counterclockwise in the engaged state. When the driven pin 27b is engaged, the slider 27 slides to the left or right in the X direction. In the released state, the slider 27 is stopped at the leftward movement position.

  The drive ring pressing plate 26 is attached to the periphery of the lens opening 5a by inserting the convex portion 26a into the groove 5d of the front main body 5, and is fixed with screws. The drive ring 24 is positionally restricted in the Z direction by the drive ring fitting outer peripheral portion 5b by the pressing plate 26, and is rotatably supported. The pressing plate 26 is also provided with a shaft pressing protrusion 26b of the guide shaft 35 and a ground contact piece 26d.

  The ground contact piece 26d of the drive ring pressing plate 26 is in electrical contact with the inner surface of the front metal cover 7 in the assembled state of the camera. On the other hand, the front metal cover 7, the middle metal cover 8, and the rear metal cover 9 are electrically connected to each other, and the middle metal cover 8 and the ground line of the built-in electric circuit board are bis-coupled. Therefore, all the metal exterior parts of the camera 1 fall to the ground line on the electric circuit side. Further, the tip end portion of the convex portion 26 a of the drive ring pressing plate 26 is disposed at a position that is extremely close to the outer periphery of the rotational movement frame 52 of the lens barrel 3 with the metal cap 62 being extended. Therefore, static electricity generated in the cap of the lens barrel 3 is discharged through the tip of the convex portion 26a when the lens barrel is extended.

  The slider 27 engages and engages the driven pin 27b with the notch 24c of the drive ring 24, and inserts the tip of the pin into the guide groove 5k in the X direction of the front body 5 so as to be slidable. The guide groove 27a is slidably fitted into the boss portion 5h of the front main body 5 and is attached to the front lower portion of the front main body 5. A drive pin 27c and a spring hook portion 27d are provided on the left side of the slider 27 in the X direction.

  The slider pressing plate 28 is fixed by screwing screws into a screw hole 5g on the boss portion 5h of the front main body 5 and a right screw hole 5i, and regulates the Z direction in a state where the slider 27 is slidable. The slider pressing plate 28 is provided with a protruding portion 28b protruding from the left end and an elongated hole 28c in the X direction at the center. When the drive pin 27c of the slider 27 comes into contact with a cam portion 29b described later of the barrier lever 29, the protrusion 28b comes into contact with the drive pin 27c and receives a downward component force of the drive pin 27c. The long hole 28c is an opening hole for operating the slider 27 during assembly.

  The barrier lever 29 is mounted by fitting the shaft hole 29a into the boss portion 5m of the front body 5 so as to be driven, and screwing the screw into the screw hole 5j of the boss portion 5m. The barrier lever 29 is provided with a cam portion 29b, a spring hook portion 29d in the vicinity of the shaft hole 29a, and a curved guide groove 29c at the end of the lever.

  The cam portion 29b of the barrier lever 29 is in contact with the drive pin 27c of the slider 27, and the barrier lever 29 is rotationally driven by following the X direction of the slider 27. A headed interlocking pin 36 fixed to the back side of the movable plate 32 is slidably fitted into the guide groove 29c.

  Further, one spring end 31b of the torsion spring 31 inserted in the boss portion 5m is suspended from the spring hooking portion 29d of the barrier lever 29. The barrier lever 29 is urged clockwise. The other spring end 31 a of the torsion spring 31 is suspended from the spring hooking portion 27 d of the slider 27. The torsion spring 31 makes the slider 27 approach the barrier lever 29 leftward in the X direction and turns the barrier lever 29 clockwise (the drive pin 27c of the slider 27 and the cam portion 29b of the barrier lever 29 abut on each other). Built in charge state energizing (in the direction).

  The guide shaft 35 is a straight shaft along the X direction. One end of the guide shaft 35 is supported by the left shaft support portion 5f of the front main body 5, and the other end is supported by the shaft support portion 5c positioned above the lens opening 5a. .

  The moving plate 32 is a metal plate-like member such as a stainless steel plate having a flat portion corresponding to the lens barrier 33, and the two-axis sliding is performed in a state where the flat portion is held along the vertical plane in the Z direction. The guide shaft 35 is inserted through the support portion 32a and one central shaft pressing convex portion 32b so as to be slidable in the X direction.

  The moving plate 32 is provided with a fitting groove 32i that is a fitting portion centered on the optical axis O at the center thereof, and serves as a biasing portion having a U-turn shape in the left direction from the upper side of the fitting groove. A cantilever-shaped spring portion 32d is provided, and an up-and-down convex T-shaped tip portion 32e is provided at the tip of the spring portion 32d. Further, an inclined tongue portion 32f is provided on the left side of the fitting groove 32i, and two protrusions 32g having a front-side protrusion shape are provided on the left and upper sides of the left side of the optical axis O. The right side surface portion of the convex portion 32g is an inclined surface. Further, an abutting sliding portion 32 h protruding at the lower end portion of the moving plate 32 is provided.

  The moving plate 32 is attached to the lens barrier 33 by fitting the fitting groove 32i to the protrusion 33i of the lens barrier 33 relative to the projection 33i in the X direction and fitting in a rotation restricted state. In the mounted state, the moving plate 32 has the T-shaped tip 32e abutting against the groove 33a of the lens barrier 33, and always presses the lens barrier 33 rearward (F direction (FIG. 6)) by the urging force of the spring 32d. To do. When the lens barrier 33 is in the closed position, the tongue piece 32f is inserted through the hole 33e of the lens barrier 33, and the contact portion 33c of the lens barrier 33 contacts the top of the convex portion 32g. Located in state.

  When the lens barrier 33 is in the open position, the movable plate 32 is a predetermined amount to the left in the X direction relative to the lens barrier 33 relative to the relative position of the lens barrier 33 and the movable plate 32 of the projection in the closed position. The slide is moving. Accordingly, the tongue portion 32f abuts on the inclined surface portion 33d of the lens barrier 33, and the abutting portion 33c of the lens barrier 33 receives the urging force of the spring portion 32d and descends from the convex portion 32g on the right side in the X direction. The lens barrier 33 is held in contact with the moving plate 32 side.

  A barrier lever 29 engaged with the headed interlocking pin 36 is inserted on the back surface of the moving plate 32, and a biasing force in the Z direction rearward by the barrier lever 29 acts on the moving plate 32. Therefore, the movable plate 32 is prevented from being lifted forward in the Z direction. Further, the displacement (displacement) of the moving plate 32 rearward in the Z direction is regulated by the upper side of the moving plate 32 being received by the guide shaft 35 and the lower side by the contact sliding portion 32 h slidingly contacting the surface of the slider pressing plate 28. The

  The assembled state of the barrier device 2 having the above-described configuration is shown in FIGS. 6 and 7 as perspective views seen from the front side or the back side.

Next, the opening / closing operation | movement of the barrier apparatus 2 is demonstrated using FIG.1, FIG.8-12, FIG.14 and also FIG.15-18.
15, 17, and 18 are cross-sectional views in each operation state of the camera. FIG. 15 shows a cross-section including the optical axis in a state where the barrier is closed and the lens barrel is retracted, and FIG. FIG. 17 is a cross-sectional view of a surface (surface below the optical axis) including a lens barrier / moving plate contact portion in a state where the barrier is closed and the lens barrel is retracted, and FIG. 18 shows a cross section including the optical axis in the state, and FIG. 18 shows a cross section including the optical axis in the state of the lens barrel tele with the barrier open.

  When the camera 1 is in the barrier closed state and in the initial state (completely retracted state) in which the lens barrel is retracted, when the drive motor 41 is started, the lens barrel 3 is not extended, and the drive motor 41 is driven. The barrier device 2 is opened. When the opening of the barrier device is completed, the lens barrel 3 starts to be unwound. The advance / retreat drive of the lens barrel 3 will be described in detail later.

  Hereinafter, the barrier opening / closing operation will be described in detail. The state where the lens barrel is in the fully retracted state and the drive ring 24 is in the initial position is the barrier device as shown in FIGS. 1 to 3 or 8 to 11. Reference numeral 2 denotes a closed state, and the lens barrier 33 is in a closed position that covers the front surface of the photographing lens (including the rotational movement frame 52 of the lens barrel).

  In the barrier closed state, the slider 27 is held at the right end position in the X direction with the driven pin 27 b engaged with the notch 24 c of the drive ring 24. The barrier lever 29 is urged to rotate clockwise with respect to the left end by the urging force of the torsion spring 31, and moves the movable plate 32 to the right (X direction) via the interlocking pin 36. (FIGS. 10 and 11). Similarly, the lens barrier 33 is in the closed position moved rightward. Since the moving plate 32 moves to the left relative to the lens barrier 33, the lens barrier 33 has the abutting portion 33c on the convex portion 32g of the moving plate 32 against the bias of the spring portion 32d. (See Fig. 16).

  When the lens barrier 33 described above is in the closed position, even if the barrier cap 34 is pressed in the direction of the optical axis O, the pressing force is received by the convex portion 32g with which the rear surface portion of the contact portion 33c of the lens barrier 33 contacts. The barrier cap 34 and the lens barrier 33 do not sink inward on the camera side (FIG. 16). On the other hand, the barrier cap 34 fits into the lens opening 7a of the front metal cover 7, the flange portion 34b of the barrier cap 34 contacts the inner surface of the lens opening 7a of the front metal cover 7, and the front surface of the barrier cap 34 It is held in a state where it matches the front surface around the lens opening 7a.

  Therefore, when the drive motor 41 rotates in the forward rotation direction, the rotational movement frame 52 starts to rotate from the initial rotation position (barrier closed / collapse position) P0 to the barrier open / collapse position P1 (FIG. 22). In the range of the rotation angle θ0, as will be described later, the rotational movement frame 52 only rotates without being extended, and other extension such as the movement frame 53 of the lens barrel 3 (FIG. 4). The rotational movement frame 52 rotates without all possible lens frame members being fed out. Then, it reaches a position where the feeding is started. The rotary shaft member 21 is rotationally driven in conjunction with the rotation of the rotational movement frame 52 described above, and the drive ring 24 on the outside of the front main body 5 rotates clockwise from the initial position where it rotates most counterclockwise. .

  As the drive ring 24 rotates in the clockwise direction, the slider 27 that is engaged via the driven pin 27 b starts to slide to the left (X direction), and the drive ring 24 rotates the rotation moving frame 52. When the interlocking rotation angle corresponding to the angle .theta.0 is rotated, the driven pin 27b is released from the notch 24c of the drive ring 24 and released, and the slider 27 stops at its leftward moving end position.

  The barrier lever 29 is pressed and driven through the drive pin 27 c of the slider 27 and the cam portion 29 b of the barrier lever 29 in contact with the charging force of the torsion spring 31 by the sliding movement of the slider 27 to the left. Rotate counterclockwise. Due to the counterclockwise rotation, the moving plate 32 slides to the left along the guide shaft 35. At the initial stage of the movement of the moving plate 32 to the left, as shown in FIG. 1, the barrier cap 34 is not yet moved because it is still fitted in the lens opening 7a of the front metal cover 7, and only the moving plate 32 is placed. Move to the left of the fixed amount.

  Accordingly, the abutting portion 33c of the lens barrier 33 is pressed by the urging force of the spring portion 32d of the moving plate 32, so that the lens barrier 33 slides on the right side surface of the convex portion 32g of the moving plate 32 and the front surface of the moving plate 32. Descends backward in the Z direction so as to contact. At the same time, the inclined surface portion 33 d of the lens barrier 33 comes into contact with the tongue portion 32 f of the moving plate 32. The relative movement of the lens barrier 33 in the Z direction rearward with respect to the moving plate 32 releases the fitting of the barrier cap 34 with the lens opening 7a. Thereafter, the lens barrier 33 and the barrier cap 34 together with the moving plate 32 are integrated. Slide left toward the open position. At this time, the lens barrier 33 is urged toward the rear moving plate by the spring portion 32d of the moving plate 32, and the inclined surface portion 33d is in contact with the back surface of the tongue portion 32f, so that the lens barrier 33 is not lifted from the moving plate 32. The barrier cap 34 moves to the left without contacting the inner part of the front metal cover 7 (FIG. 17).

  When the slider 27 reaches the left moving end position, the lens barrier 33 and the barrier cap 34 are located outside the movement locus of the lens barrel 3, that is, the open position retracted from the lens opening 7a of the front metal cover 7. In other words, it is located at the retracted position retracted from the front surface of the photographing lens (FIG. 12).

  After the rotation angle θ0 of the rotation moving frame 52 is rotated, the drive motor 41 is further driven to rotate, and when the rotation movement frame 52 is rotated counterclockwise by the rotation angle θ1, the rotation movement frame 52 of the lens barrel 3 is rotated. In addition, the lens frame members that can be moved back and forth are extended to a position where they can be photographed. Furthermore, when the rotational movement frame 52 is rotated within the range of the rotation angle θ2, each advancing / retracting lens frame member moves forward / backward from the wide position to the tele position. The drive ring 24 also rotates clockwise in association with the range of the rotation angles θ1 and θ2 of the rotational movement frame 52 described above. In the rotation range of the drive ring 24, the driven pin 27b of the slider 27 is The driven pin 27 b comes into contact with the outer peripheral portion of the drive ring 24 by being removed from the notch 24 c of the drive ring 24. Since the driven pin 27b is in contact with the outer peripheral portion of the drive ring 24 as described above, the slider 27 stays at the above-mentioned left moving end position, the barrier lever 29 and the moving plate 32 also stop, and the lens barrier 33 and the barrier The cap 34 also remains in the open position.

  In the state where the lens barrier 33 is in the open position, the lens frame member including the outermost rotationally moving frame 52 and each movable frame frame member does not interfere with the lens barrier 33 and passes through the lens opening 7 a of the front metal cover 7. To the position where it can be taken.

  Thereafter, in order to return the camera to the retracted state of the lens barrel and move the lens barrier 33 to the closed position, first, the drive motor 41 is driven in reverse, and the rotational moving frame 52 is retracted from the tele position. Subsequently, it is rotated in the reverse direction clockwise only by the rotation angle θ1. When the drive ring 24 is driven to rotate counterclockwise by a corresponding angle in conjunction with the reverse transfer drive of the rotational movement frame 52, the driven pin 27b of the slider 27 is pressed by the convex portion 24, and the drive ring 24 Re-engage with the notch 24c.

  Subsequently, when the drive ring 24 is rotated counterclockwise corresponding to the clockwise rotation angle .theta.0 of the rotary moving frame 52, the slider 27 moves to the right. During the movement, the barrier lever 29 rotates clockwise while the drive pin 27c of the slider 27 and the cam portion 29b of the barrier lever 29 are in contact with each other by the charging force of the torsion spring 31 (that is, the torsion spring). The barrier lever 29 is driven by the charging force 31 and rotates clockwise). By this rotation, the moving plate 32, the lens barrier 33, and the barrier cap 34 all move in the right direction.

  The slider 27 slides to the right initial position, the right end 34a of the outer diameter portion of the barrier cap 34 contacts the right end 7a1 of the lens opening 7a of the front metal cover 7, and the lens barrier 33 moves in the right direction. Stop. However, the moving plate 32 further moves to the right by a predetermined amount. At that time, the abutting portion 33c of the lens barrier 33 that moves relative to the moving plate 32 resists the urging force in the Z direction rearward by the spring portion 32d from the right side of the convex portion 32g of the moving plate 32. Get on top. Therefore, the moving plate 34 comes into contact with the inner surface side right end step portion of the lens barrier 33 and stops.

  As a result of the ride-up operation, the outer diameter portion of the barrier cap 34 is fitted into the lens opening 7a of the front metal cover 7, and the surface of the barrier cap 34 coincides with the surface of the front metal cover 7 and is returned to the barrier closed position.

  Thereafter, the drive ring 24 is further rotated counterclockwise, and only the slider 27 is overstroked to reliably move the lens barrier 33 and the moving plate 32 to the above-described barrier closed position and stop. . In the stopped state, the torsion spring 31 is charged by a small amount, and the drive pin 27c of the slider 27 and the cam portion 29b of the barrier lever 29 are slightly separated to form a gap. At this time, the rotational movement frame 52 also returns to the initial rotation position P0 described above.

  In the barrier device 2, as shown in FIG. 14, when the external force G is applied from the right side of the lens barrier 33 during the barrier closing operation and the barrier closing operation is prevented, the moving plate 32 is moved to the left by the lens barrier 33. The barrier lever 29 rotates counterclockwise while bending the torsion spring 31. Due to the bending of the torsion spring 31, the external force G is absorbed, and deformation of the barrier device 2 and damage to the gear system of the drive motor 41 can be prevented.

  In the opening / closing operation of the barrier device 2 described above, while the barrier lever 29 is rotating counterclockwise, the barrier lever 29 is rotated by pressing the cam portion 29b of the barrier lever 29 with the driving pin 27c of the slider 27. On the other hand, during the clockwise rotation of the barrier lever 29, the barrier lever 29 rotates while the cam portion 29b of the barrier lever 29 is driven by the drive pin 27c of the slider 27 or slightly separated. During the above operation, the opening angle α (FIG. 9) of the torsion spring 31 does not vary greatly. In other words, the charge state of the torsion spring hardly changes. Therefore, the energy consumption for driving the barrier device 2 of the drive motor 41 is extremely less than that of the conventional barrier drive device in which the charge amount of the drive biasing spring member is large.

  Next, the configuration of the lens barrel 3 will be described with reference to exploded perspective views of the lens barrel of FIGS.

  The lens barrel 3 includes a fixed frame 51 fixedly supported by the front body 5, a rotation moving frame 52 that is a third frame that can rotate and move forward and backward, and a rotation restricted, and the lens barrel 3 moves linearly together with the cam frame 55. A movable moving frame 53, a frame member whose rotation is restricted and capable of linear movement, a first group frame 54 that is driven forward and backward by a cam frame 55, and a frame member that is capable of rotating and moving forward and backward. A cam frame 55 that is a second frame that is driven back and forth by a frame 58 and a first group lens holding frame 72 that holds a first group lens 71 that is a photographic lens are supported so as to be able to advance and retract. A focus frame 56 that is fixedly supported, and a frame member that is rotated and controlled to advance and retreat, a second group lens holding frame 74 that holds a second group lens 73 that is a photographing lens, and a cam frame 55. A second group frame 57 driven forward and backward by The frame member is a frame member that is restricted in rotation and capable of linear movement. The linear frame 58 that is a first frame that moves forward and backward together with the rotational movement frame 52 and the key ring 59 that is a movable frame member that guides the second group frame 57 linearly. A flare diaphragm 60 (FIGS. 18 and 19) affixed to the key ring 59 and a diaphragm member forming the diaphragm device, and a flare diaphragm 69 (FIGS. 18 and 19) affixed to the fixed frame 51. 61.

  The fixed frame 31 is a cylindrical frame member, and a helicoid screw (female) 51b disposed in the second region as a rotational movement control means on the inner peripheral portion thereof, and a helicoid disposed on the end portion of the first region. A screw side surface 51a, a circumferential insertion portion 51i along the circumferential direction of the front end of the helicoid screw 51b, three inclined guide grooves 51c communicating with the circumferential insertion portion, and a circumferential direction communicating with the communication guide groove Are provided with three circumferential guide grooves 51d arranged in a third region, and further, three rectilinear guide grooves 51e having rear end face opening portions are provided.

  In addition, a gear chamber 51g that opens to the inner peripheral portion is provided at a part of the outer side of the fixed frame 51, and a shaft support hole 51h is provided at the front portion thereof. In this gear chamber 51g, the lens barrel drive gear 44 is rotatably supported with the shaft portion 44a fitted into the shaft support hole 51h and the other shaft portion 44b fitted into the shaft support hole 61c of the CCD support frame 61. And stored.

  A waterproof seal ring 65 having a V-shaped cross section for waterproofing is fixed to the outer peripheral portion of the front end surface of the fixed frame 31. When the fixed frame 31 is fixed to the front main body 5, the outer peripheral portion of the waterproof seal ring 65 is pressed against the fixed frame mounting inner peripheral surface of the front main body 5.

  The rotational movement frame 52 is a cylindrical frame member. A spur-shaped outer peripheral gear part 52a is provided on a part of the circumference of the rear part of the outer periphery, and a helicoid screw (rotational movement control means) is provided on the other part of the outer periphery. (Male) 52b, and three convex portions 52c are provided as rotational movement control means spaced apart from the gear portion 52a and the helicoid screw 52b on the front side in the Z direction. Further, a circumferential groove 52d for a bayonet mechanism, which is a cam frame driving means having a rear opening along the circumferential direction, and a circumferential groove 52d in the Z direction with respect to the circumferential groove at the inner circumferential rear part of the rotary moving frame 52. A circumferential groove 52e for a bayonet mechanism having a rear opening on a circumference separated by a predetermined distance, and two rectilinear grooves as cam frame driving means having a rear opening and continuing (communication state) to the circumferential groove 52d 52f and a straight rectilinear groove 52g that is a cam frame driving means along the Z direction that is continuous (communication state) with the circumferential groove 52d and intersects the circumferential groove 52e ( FIG. 23). A portion where the circumferential groove 52d is continuous with the rectilinear groove 52g, in other words, a clockwise groove wall surface portion 52h of the communicating portion is provided (FIG. 23).

  A metal cap 62 is fitted and bonded to the outer peripheral portion of the rotational movement frame 52. Further, a waterproof seal ring 66 having a V-shaped cross section is bonded and fixed to the inner peripheral tip of the rotary moving frame 52.

  The moving frame 53 is a cylindrical frame member, and a rectilinear guide convex portion 53a is provided at the outer peripheral rear portion thereof, and a circumferential groove 53b and a rectilinear guide groove 53d are provided at the inner peripheral rear portion thereof.

  A metal cap 63 is fitted and bonded to the outer periphery of the moving frame 53. Further, a waterproof seal ring 67 having a V-shaped cross section is bonded and fixed to the inner peripheral tip of the moving frame 53.

  The first group frame 54 is a cylindrical frame member in which a front annular portion having a lens opening is formed. A rectilinear guide convex portion 54d is provided on the outer peripheral rear portion, and a pin hole 54e in the inner peripheral rear portion. The cam follower 54c is fixed to the head. Inside the annular portion of the first group frame 54, the focus frame 56 is fixed by screwing a screw inserted through a screw insertion hole 54b provided in the annular portion into the screw hole 56a.

  The focus frame 56 includes a focusing drive mechanism including a focus motor 70, and is a frame member that is driven forward and backward by the focusing drive mechanism. The focus frame 56 includes a first group lens holding frame 72 that holds the first group lens 71. Supports advancement and retreat.

  A metal cap 64 is fitted and bonded to the outer periphery of the first group frame 54, and a decorative plate 68 is bonded and fixed to the front annular portion.

  The cam frame 55 is a cylindrical frame member, and is a second cam follower having a substantially parallelogram cross section having a side surface inclined in the direction of the optical axis O and a side surface parallel to the circumferential direction at a rear stepped outer peripheral portion. And three pin-shaped cam followers 55b0 and 55b1 which are first round-pin-shaped cam followers projecting outward are provided at the center of the cam follower 55a. Three guide convex portions 55c along the circumferential direction are provided in front of the stepped outer peripheral portion, the tip of which is lower than the stepped outer peripheral portion. A cam groove 55d, which is a cam means, is provided in the front outer peripheral portion, a circumferential groove 55e is provided in the inner peripheral rear portion, and a cam groove 55f, which is cam means, is provided in the inner peripheral portion.

  The focus frame 56 is a frame member having a circular opening, and a first group lens holding frame 72 that holds the first group lens 71 is inserted into the circular opening in a state in which the first group lens holding frame 72 can advance and retreat in the optical axis O direction. Yes. A focus motor 70 including a step motor is attached to the focus frame, and the first group lens holding frame 72 is advanced and retracted during focus drive.

  The second group frame 57 is a frame member in which a second group lens holding frame 74 that holds the second group lens 73 is incorporated, and includes a shutter mechanism unit including a shutter actuator and an ND filter mechanism unit including a filter actuator. is doing. The second group frame 57 is provided with a cam follower 57b that protrudes outward, and a rectilinear groove 57a that extends in the Z direction on both sides.

  The key ring 59 is a ring-shaped frame member having a central opening (inner peripheral portion) 59e and an outer peripheral portion 59a on a plane orthogonal to the moving direction (optical axis O direction). Three rectilinear guide protrusions 59b protruding in the direction, and two straight key portions 59c extending forward in the Z direction from the inner peripheral portion 59e are provided.

  The flare stop 60 is a deformable thin plate ring-shaped stop member having a central opening 60a made of a sheet material such as a polyester material, and has a cut 60b along the radial direction and a cut 60c along the circumferential direction. Yes. The flare stop 60 is fixed by adhering concave mounting portions 60d to the three flare stop mounting portions 59d on the back side of the key ring 59 at three locations on the outer periphery. The surface of the flare stop 60 is a plane orthogonal to the moving direction (the optical axis O direction) of the key ring 59 when the key ring 59 is mounted on the back side.

  As will be described later, the flare stop 60 attached to the key ring 59 is elastically deformed by the cuts 60b and 60c when the periphery of the central opening 60a is pressed forward or backward in the Z direction by another frame member. As a result, the periphery of the central opening 60a is displaced along the pressing direction and passes forward through the central opening 57e of the key ring 59, or around the central opening 60a by the central convex portion of another relatively moving frame member. It is also possible to move backward by pushing.

  The rectilinear frame 58 is a cylindrical frame member, and the rear end flange portion is provided with a rectilinear guide convex portion 58a projecting to the outer periphery, and the cylindrical portion closer to the outer periphery of the rear end flange has a radial direction and a circumferential direction. And a bayonet extending along the radial direction and the circumferential direction at a predetermined distance in the Z direction from the circumferential position of the convex portion 58b. Protrusions 58c that become nails are provided.

  Note that the five convex portions 58b and the one convex portion 58c are dispersedly arranged at important points on the circumference as necessary, and a thrust force is applied to the rotationally moving frame 52 and the rectilinear frame 58. Further, deformation or inclination of the rectilinear frame 58 or the rotational movement frame 52 is prevented, or damage is prevented.

  A flare stop 69 made of a sheet member is attached to the rear end surface of the rectilinear frame 58. Unlike the flare stop 60, the flare stop 69 is not deformed when the lens barrel 3 moves back and forth.

  The cylindrical part of the rectilinear frame 58 is a groove penetrating the inner and outer circumferences, which is a lens driving circumferential cam means, a circumferential groove part 58e for providing a cam frame idling region, and a feeding cam means, Three cam grooves 58d which are cam frame rotation control means including an inclined cam groove 58f for providing a cam frame drive region are provided. The inner peripheral portion is provided with three rectilinear guide grooves 58h that open to the rear and three rectilinear guide grooves 58g that open to the front.

  The CCD support frame 61 is fixed to a CCD support plate that holds the CCD 82 and the optical filter 81 serving as an image pickup device. The CCD support frame 61 is provided at the CCD opening 61 a disposed in front of the CCD 82 and the optical filter 81 and the rear inner periphery of the fixed frame 51. It has the fitting part 61b to fit.

Next, the assembly and fitting state of each component of the lens barrel 3 described above will be described.
Table 1 shows corresponding parts in which the respective constituent members are engaged with each other or fitted in the assembled state of the lens barrel 3. In the table, the reference numerals in parentheses indicate the figures. 4 and 5 are the reference numerals described in parentheses, and the portions that engage / fit each other between the constituent members are indicated by the same reference numerals.

  First, the cam frame 55, the first group frame 54, the second group frame 57, the key ring 59, and the moving frame 53 are assembled and fitted to the rectilinear frame 58.

  Specifically, the first group frame 54 is fitted into the outer periphery of the cam frame 55 in a state where the cam follower 54c is slidably fitted into the cam groove 55d of the cam frame 55 in a state where relative rotation and advance / retreat are possible. The focus frame 56 fixed to the first group frame 54 is inserted into the inner peripheral portion of the cam frame 55. The second group frame 57 is fitted into the inner peripheral portion of the cam frame 55 so as to be capable of relative rotation and advancement / retraction in a state in which the cam follower 57b is slidably fitted into the cam groove 55f.

  The key ring 59 is inserted into the inner peripheral portion of the cam frame 55 from the rear, and the outer peripheral portion 59a is fitted into the circumferential groove 55e on the inner peripheral surface of the cam frame 55 in a rotatable state. The group frame 57 is slidably fitted into the rectilinear groove 57a.

  The cam frame 55 is fitted into the inner periphery of the rectilinear frame 58 in a state in which the stepped outer peripheral portion of the cam frame 55 is fitted from the rear so as to be capable of relative rotation and advance / retreat. The cam follower 55a of the cam frame 55 is slidably fitted into the cam groove 58d.

  The moving frame 53 is fitted in such a manner that the rectilinear guide convex portion 54d of the first group frame 54 is slidably fitted into the rectilinear guide groove 53d from the front of the first group frame 54, The guide protrusion 55c of the cam frame 55 is slidably fitted into the circumferential groove 53b of the moving frame 53. The rectilinear guide convex portion 53a of the moving frame 53 is slidably fitted into the rectilinear guide groove 58g of the rectilinear frame 58. The rectilinear guide protrusion 59b of the key ring 59 is slidably fitted into the rectilinear guide groove 58h of the rectilinear frame 58. Accordingly, the key ring 59 is supported in a state in which the rotation with respect to the rectilinear frame 58 is restricted and the key ring 59 can advance and retreat.

  The rectilinear frame 58 into which the cam frame 55 and the like are assembled and inserted is inserted from the rear into the inner periphery of the rotational movement frame 52. The convex portion 58b of the rectilinear frame 58 is inserted into the circumferential groove 52d, and the convex portion 58c is inserted into the circumferential groove. In a state of being slidably fitted in the respective 52e, it can be rotated relative to the rotational movement frame 52, and can be integrally moved in the Z direction (optical axis O direction). In the fitted state, the two pin-like cam followers 55b0 of the cam frame 55 are first slidably fitted into the circumferential groove 52d of the rotational movement frame 52, and further, by the relative rotation of the rotational movement frame 52, the linear movement groove 52f side. Can enter. In addition, one pin-like cam follower 55b1 of the cam frame 55 is first slidably fitted into the circumferential groove 52d of the rotational movement frame 52, and can enter the rectilinear groove 52g side by relative rotation of the rotational movement frame 52. Mate with.

  The rotationally moving frame 52 assembled with the rectilinear frame 58 and the like is fitted so as to be able to rotate and advance / retreat in a state where the helicoid screw 52b and the helicoid screw 51b are screwed to the inner periphery of the fixed frame 31. Further, the convex portion 52c of the rotational movement frame 52 is slidably fitted into the inclined guide groove 51c and the circumferential guide groove 51d of the fixed frame 51. Further, the rectilinear guide convex portion 58a of the rectilinear frame 58 is slidably fitted into the rectilinear guide groove 51e of the fixed frame 51.

  The lens barrel drive gear 44 meshes with the gear portion 52 a of the rotational movement frame 52, and the rotational movement frame 52 is rotationally driven by the lens barrel drive gear 44.

  A CCD support plate 61 on which an optical filter 81 and a CCD 82 are mounted is fixed to the rear inner peripheral portion 51f of the fixed frame 51 in which the rotational moving frame 52 and the like are incorporated by fitting the fitting inner peripheral portion 61b.

  As a waterproof structure around the lens barrel 3, the joint between the fixed frame 51 and the front main body 5 and the sliding part between the fixed frame 51 and the cap 62 of the rotary moving frame 52 are: A waterproof seal is made by a waterproof seal ring 65 fixed to the distal end of the fixed frame 51, and the sliding portion between the inner peripheral portion of the rotational movement frame 52 and the cap 63 of the movable frame 53 is the distal end of the rotational movement frame 52. A waterproof seal is made by a waterproof seal ring 66 that is fixed to the frame, and a sliding portion between the inner peripheral portion of the moving frame 53 and the cap 64 of the first group frame 54 is fixed to the tip of the moving frame 53. A waterproof seal is made by the waterproof seal ring 67, and the space between the lens barrel 3 and the fixed frame 51 is waterproof.

  In the lens barrel 3 described above, when the rotational movement frame 52 is rotationally driven by the lens barrel driving gear 44, the rotational movement frame 52 advances and retreats by a predetermined angle during an initial period for barrier driving with respect to the fixed frame 51. After the rotation, the helicoid screw 51b is fed out to rotate at the extended position. By the rotation of the rotational movement frame 52, each lens frame is advanced or retracted or rotated as follows.

  The rectilinear frame 58 moves rectilinearly forward and backward together with the rotational movement frame 52 in a state in which the rotation is restricted by the rectilinear guide groove 51 e by the fixed frame 51. The moving frame 53 moves forward and backward in a state integrated with the forward and backward movement through the guide convex portion 55 c of the cam frame 55 that rotates and moves forward and backward in a state where the rotation is restricted by the straight guide groove 58 g.

  The cam frame 55 is in an immobile state while the rotational movement frame 52 is rotated by the initial predetermined angle. Thereafter, when the rotational movement frame 52 is rotated, the cam frame 55 moves forward and backward while rotating by the cam groove 58d of the rectilinear frame 58. . The first group frame 54 is driven forward and backward by the cam groove 55 d of the cam frame 55 integrally with the focus frame 56 in a state in which the rotation is restricted by the rectilinear guide groove 53 d of the moving frame 53. The second group frame 57 is restricted in rotation by the rectilinear guide groove of the rectilinear frame 58, and is restricted in rotation by a key ring 59 that advances and retreats integrally with the rectilinear frame 58, and is advanced and retracted by the cam groove 55 f of the cam frame 55. The

Here, the deformation state of the flare stop 60 during the lens frame advancing / retreating operation of the lens barrel 3 will be described with reference to FIGS. 1 and 19 to 21.
FIG. 19 is a longitudinal sectional view including the optical axis in the wide state of the lens barrel of the camera. 20 and 21 are perspective views of a key ring 59 and a flare stop 60 applied to the lens barrel. FIG. 20 shows a state in which the periphery of the central opening of the flare stop is pushed forward. These show the state where the periphery of the central opening of the flare stop is pushed backward.

  A flare stop 60 is affixed to the back surface of the key ring 59 fitted in the rear portion of the cam frame 55. As shown in FIG. 1, when the lens barrel 3 is in the retracted state, the convex portion around the opening 61 a of the CCD support frame 61 enters the opening 59 e of the key ring 59. At that time, as shown in FIG. 20, the flare stop 60 is deformed by the cut portion 60b of the flare stop 60, and at the same time, the beam portions 60e and 60f formed by the cut portions 60c cut in the circumferential direction are also deformed. Since the periphery of the flare stop opening 60a can be displaced forward and pass through the opening 59e of the key ring 59, the convex portion around the opening 61a of the CCD support frame 61 described above is connected to the opening 59e of the key ring 59. You can enter.

  As shown in FIG. 19, when the lens barrel 3 is in the wide state, the rear end surface of the second group frame 57 comes out behind the key ring 59. In this state, as shown in FIG. 21, in the flare stop 60, the cut portion 60b of the flare stop 60 is deformed, and at the same time, the beam-like portions 60e and 60f formed by the cut portion 60c are also deformed, and the flare stop central opening 60a is formed. The periphery of is displaced backward. As described above, this displacement allows the rear end surface of the second group frame 57 to protrude behind the opening 59e of the key ring 59.

Next, the advancing / retreating operation of the lens barrel 3 having the above-described configuration in the camera 1 will be described in accordance with the opening / closing operation of the barrier device 2 with reference to FIGS.
22A, 22B, and 22C are developed views of the inner peripheral surface of the fixed frame of the lens barrel and the lens barrel drive gear, and the outer peripheral gear portion of the rotary moving frame and the helicoid screw (male). FIG. 22A is a development view of the operating state as seen from the inner peripheral side showing the partial development views of the convex portions, and FIG. 22A shows the lens mirror at the initial stage of driving when the camera is in the closed state and the lens barrel retracted state. FIG. 22B shows the state of the lens barrel when the camera is in the barrier open state, the lens barrel retracted state, and the lens barrel extended state (wide state). (C) shows the state of the lens barrel when the camera changes from the lens barrel wide state to the tele state. FIG. 23 is a development view of the operating state as seen from the inner circumference side showing the cam follower of the cam frame and the cam groove of the rectilinear frame superimposed on the development view of the inner circumference of the rotational movement frame of the lens barrel. FIG. 4 is a diagram showing a state of a retracted / collapsed state, an opened / collapsed state of a barrier, an initial state of opening / feeding out a barrier, a state of opening / opening of a barrier, and a state of opening / zooming a barrier (tele state). FIG. 24 is a developed view of the cam follower and cam groove of the cam barrel of the lens barrel as seen from the outer periphery.

  1 and 15, to maintain the barrier closed state and the lens barrel retracted state from the lens barrel retracted state to the barrier open state, the drive motor 41 is driven forward and the lens drive gear 44 is interposed. Then, the rotational movement frame 52 is rotated counterclockwise by an angle θ0 (first region) from the initial position (barrier closed / collapsed state position) P0 (rotation in the direction D1 in FIG. 4). At that time, the drive ring 24 is also driven in conjunction with an angle corresponding to the angle .theta.0 of the rotational movement frame 52 (rotation in the direction D3 in FIG. 2), and as described above, the lens barrier 33 of the barrier device 2 is shown in FIGS. To the open position (retracted position) shown in FIG.

  On the lens barrel 3 side, the rotational moving frame 52 which is in the initial position P0 in FIG. 22A and is not screwed with the helicoid screw (female) 51b of the fixed frame 51 is counterclockwise at an angle θ0 (first And the helicoid screw (male) 52b comes into contact with the end surface 51a of the helicoid screw (female) when it reaches the barrier open / collapsed state position P1 shown in FIG. In the rotation range of the angle θ0, since the helicoid screw 52b is not yet screwed, the rotary moving frame 52 is not drawn out in the direction of the optical axis O (still in the retracted position).

  On the other hand, when the rotational movement frame 52 is at the initial position P0, the circumferential groove 52d of the rotational movement frame 52 in which the five convex portions 58b and one convex portion 58c of the rectilinear frame 58 are always slidably fitted, and Further, pin-like cam followers 55b0 and 55b1 of the cam frame 55 are fitted into the 52e (the state of the rotational movement frame 52 (P0) in FIG. 23). Therefore, when the rotational movement frame 52 is rotated by an angle θ0 (rotation to the position P1), the pin-shaped cam follower 55b0 is relatively moved on the circumferential groove 52d, and the rectilinear groove 52f of the rotational movement frame 52 and the optical axis. It will be in the state which opposes in a direction. On the other hand, the pin-shaped cam follower 55b1 moves relatively in the circumferential groove 52d, contacts the groove wall surface 52h of the circumferential groove 52d, and opposes the rectilinear groove 52g of the rotational movement frame 52 connected to the wall surface in the optical axis direction. (The state of the rotational movement frame 52 (P1) in FIG. 23).

  When the above-described rotational movement frame 52 is rotated by the angle θ0, the pin-like cam followers 55b0 and 55b1 of the cam frame 55 are on the circumferential groove 52d, so that the cam frame 55 does not move in the optical axis O direction. Further, since the cam frame 55 is not rotated with respect to the rectilinear frame 58, the cam follower 55 a of the cam frame 55 is stopped at the rear end portion of the inclined cam groove 58 f of the cam groove 58 d of the rectilinear frame 58. Accordingly, there is no movement of the rectilinear frame 58 in the optical axis O direction, and there is no advance / retreat movement of the first group frame 54. In other words, all the lens frame members of the lens barrel 3 are not extended in the direction of the optical axis O, remain in the retracted position, and the extension operation of the lens barrier 33 is not hindered.

  Subsequently, when the rotational movement frame 52 is driven to rotate counterclockwise from the barrier open / collapsed state position P1 to the barrier open / feeding end position P2, that is, the rotation range (the second rotation angle θ1) When entering the region), the helicoid screw (male) 52b contacts the helicoid screw (female) end surface 51a and receives the force in the feeding direction, so that the helicoid screw (male) 52b becomes helicoid screw (female) 51b, and the rotational movement frame 52 starts to be fed out while rotating in the direction of the optical axis O (FIG. 22B). The H direction shown in FIG. 22B indicates the moving direction of the rotational movement frame 52 on the development view.

  Since the convex portions 58 b and 58 c of the rectilinear frame 58 are fitted in the circumferential grooves 52 d and 52 e of the rotational movement frame 52, the non-rotational rectilinear frame 58 is also fed out together with the rotational movement frame 52. At the start of the extension, the lens barrier 33 has already been moved to the open position (retracted position) as shown in FIG. 17, so that there is no problem in the extension of the lens barrel.

  On the other hand, the pin-shaped cam follower 55b1 receives a counterclockwise rotational force by the groove wall surface 52h at the end of the rectilinear groove 52g of the rotational movement frame 52 by the rotational driving of the rotational movement frame 52, and the cam frame 55 and the rotational movement frame 52 Integral and counterclockwise rotation is started (state of the rotational movement frame 52 (P1) in FIG. 23). When the cam frame 55 starts to rotate counterclockwise, the cam follower 55a slides in the cam frame driving region on the inclined cam groove 58f of the cam groove 58d of the rectilinear frame 58, and the cam frame 55 is relatively relative to the rectilinear frame 58. The feeding out in the direction of the optical axis O is started. At the same time, the moving frame 53 connected to the cam frame 55 by the guide convex portion 55c is also fed out in the direction of the optical axis O in a non-rotating state.

  When the cam frame 55 starts to rotate, the first group frame 54 and the focus frame 56 start to move toward the wide position via the cam groove 55d and the cam follower 54c, and the cam groove 55 starts to be extended relative to the cam frame 55. The second group frame 57 is directed to the wide position via 55f and the cam follower 57b and starts to be retracted relative to the cam frame 55 (FIG. 24).

  When the cam frame 55 starts to be fed, the pin-shaped cam follower 55b1 enters the rectilinear groove 52g of the rotational movement frame 52, and at the same time, the pin-shaped cam follower 55b0 also enters the rectilinear groove 52f of the rotational movement frame 52. Thereafter, the pin-shaped cam followers 55b1 and 55b0 receive the rotational driving force of the rectilinear grooves 52g and 52f of the rotational movement frame 52 to rotate the cam frame 55 counterclockwise, and the cam follower 55a It continues to slide on the inclined cam groove 58f.

  When the rotational movement frame 52 is within the range of the rotational angle θ1, and is rotated by the rotational angle θa from the barrier open / collapsed state position P1, the cam frame 55 is extended by the extension amount S0 (the rotational movement frame in FIG. 23). 52 (P1 to P2)), the pin-shaped cam follower 55b1 entering the rectilinear groove 52g of the rotary moving frame 52 reaches the intersection of the rectilinear groove 52g with the circumferential groove 52e. At this time, since the other pin-shaped cam follower 55b0 is guided by the rectilinear groove 52f having no intersecting portion, the pin-shaped cam follower 55b1 does not deviate from the rectilinear groove 52g, so that the normal cam frame 55 can be rotated and fed out. To continue.

  When the rotational movement frame 52 is rotated by the range (second region) of the rotational angle θ1 and reaches the barrier opening / feeding end position P2 (in other words, the wide position), the helicoid screw 52b of the rotational movement frame 52 is fixed to the fixed frame 51. Passes through the screwed state with the helicoid screw 51 and reaches the circumferential insertion portion 51i (FIG. 22B). Similarly, the outer peripheral gear portion 52a of the rotational movement frame 52 reaches the circumferential insertion portion 51i. Further, the convex portion 52 c of the rotational movement frame 52 passes through the inclined guide groove 51 c of the fixed frame 51 and reaches the end portion (entrance) of the circumferential guide groove 51 d. The rectilinear frame 58 is also extended in the optical axis O direction together with the rotational movement frame 52.

  On the other hand, the cam follower 55a of the cam frame 55 reaches the end of the inclined cam groove 58f of the rectilinear frame 58, that is, the end (entrance) of the circumferential cam groove 58e (the state of the rotational movement frame 52 (P2) in FIG. 23). The cam frame 55 is fed out by the feed amount S1 relative to the rectilinear frame 58 (and thus also with respect to the rotational movement frame 52). The moving frame 53 is also fed out together with the cam frame 55.

  24, the cam followers 54c and 57b engaged with the cam groove of the cam frame 55 slide on the cam grooves 55d and 55f within the range of the rotation angle θ1 of the rotational movement frame 52, as shown in the cam groove development view of FIG. Then, the first group frame 54 and the focus frame 56 are extended to the wide position, and at the same time, the second group frame 57 is extended to the wide position.

  As described above, the camera 1 opens the lens barrier 33 by rotating the rotational angle θ0 (first region) of the rotational movement frame 52, and then rotates the rotational angle θ1 (second region) of the rotational movement frame 52. Each lens frame member is driven to move back and forth by the movement, and the lens barrel 3 is set from the retracted state to the extended state (wide extended state) in which photographing can be performed (FIG. 19).

  Subsequently, as shown in FIG. 22C, the rotational movement frame 52 is further moved from the barrier opening / feeding end position P2 to the barrier opening / zoom (tele end) position P3 within a range of the rotation angle θ2 (third region). Is rotated, the convex portion 52c of the rotational movement frame 52 enters the circumferential guide groove 51d of the fixed frame 51, and slides and moves with no play. Further, the helicoid screw 52b and the outer peripheral gear portion 52a move in the circumferential insertion portion 51i of the fixed frame 51.

  When the rotational movement frame 52 is guided and rotated along the circumferential guide groove 51d on the fixed frame 51 as described above, the rotational movement frame 52 rotates without moving forward and backward in the optical axis O direction. The rectilinear frame 58 is also held without moving forward and backward in the optical axis O direction together with the rotary moving frame 52.

  On the other hand, since the cam follower 55a enters the circumferential groove 58e of the rectilinear frame 58 and slides and moves with no play, the cam frame 55 can be rephrased without moving forward and backward with respect to the rectilinear frame 58 together with the rotary moving frame 52. For example, it rotates without moving forward and backward in the direction of the optical axis O on the idle region.

  As described above, when the rotational movement frame 52 and the cam frame 55 rotate within the range of the rotation angle θ2 with the cam frame 55 not moving back and forth, the cam follower 54c of the first group frame 54 is connected to the cam frame 55 as shown in FIG. The first group frame 54 is moved back and forth from the wide position to the tele position. At the same time, the cam follower 57b of the second group frame 57 slides and moves in the cam groove 55f of the cam frame 55, and the second group frame 57 is moved back and forth from the wide position to the tele position. FIG. 18 shows a state in which the lens barrel 3 is extended to the tele position.

  When the camera 1 in the above-described photographing enabled state is returned from the wide state to the retracted state and is further brought into the barrier closed state, the drive motor 41 is driven in the reverse direction, and the rotary moving frame 52 shown in FIG. When the lens barrel is retracted to the retracted position while rotating clockwise by the rotation angle θ1, the other lens frame members are also retracted to the retracted position. During the rotation period, the drive ring 24 of the barrier device 2 described above also rotates in a counterclockwise direction, but the slider 27 is restricted from moving rightward by the outer diameter portion of the drive ring 24. The lens barrier 33 remains in the open state while remaining in the leftward movement position.

  Further, when the drive motor 41 is driven in the reverse direction, the rotational moving frame 52 rotates clockwise by the rotation angle θ0 from the burr open / collapse position P1 to the barrier close / collapse position P0 shown in FIG. At the same time, the drive ring 24 further rotates counterclockwise, so that the slider 27 starts sliding to the right, and the lens barrier 33 moves to the closed position (protection position) described above. The camera 1 is returned to the initial state of the barrier closed / lens barrel retracted state by the clockwise rotation angle θ0 of the rotational movement frame 52.

  As described above, the lens driving device for driving the lens barrel 3 of the camera 1 according to the present embodiment forward and backward is a lens driving device for a camera having a retracting photographing lens and a lens barrier moving forward and backward. The rotary moving frame 52 for extending the photographing lens is initially idle, the lens barrier 33 is retracted at the idle time, and then the lens is extended. That is, the drive motor 41 is driven to rotate forward, and first, the rotary moving frame 52 is rotated counterclockwise within the range of the rotation angle θ0 (first region). In the rotation operation, the other lens frame members including the rotational movement frame 52 remain in the retracted position and are not drawn out. On the other hand, the barrier device 2 is driven in an interlocked state by the drive motor 41 to move the lens barrier 33 to the open position. Thereafter, when the rotational movement frame 52 is rotated counterclockwise in the range of the rotation angle θ1 (second region), the rotational movement frame 52 and other lens frame members are drawn out to positions where photographing is possible. Further, the lens barrel 3 can be zoomed to the wide state or the tele state by driving the rotational movement frame 52 to rotate within the range (third region) of the rotational angle θ2.

  The camera 1 of the present embodiment does not require a dedicated drive source for driving the lens barrier for opening and closing the front surface of the photographing lens, and the lens motor is opened and closed by the drive motor 41 that is one electric drive source. The advancing and retreating driving can be performed without interference, and the arrangement space required for the barrier device and the lens barrel is also small.

  In particular, in the lens barrel 3, the rotational movement frame 52, the rectilinear advance frame 58, and the cam frame 55 have a rotational / advanced / retracted coupling structure. Cam followers 55b0 and 55b1 that can be fitted are arranged, and the cam followers 55b0 and 55b1 enter the rectilinear grooves 52f and 52g of the rotary moving frame 52 by the subsequent rotation of the rotary moving frame 52, and the rotation of the rotary moving frame 52 is rotated. It is transmitted to the cam frame 55. In the present embodiment, the circumferential groove 52e intersects the rectilinear groove 52g, and the cam follower 55b that slides on the rectilinear groove 52g may be caught at the intersection with the circumferential groove 52e. However, when approaching the intersecting portion, the other cam follower 55b is fitted into another rectilinear groove 52f side and slides to restrict the rotational position of the cam frame 55 and pass through the above-described intersecting portion. The rotation of 52 is transmitted to the cam frame 55 without inconvenience.

  Therefore, in the present embodiment, even if the circumferential groove 52e intersects one rectilinear groove 52g, it is possible to pass through the intersecting portion without any trouble by guiding it with the other rectilinear groove 52f. is there. Accordingly, it is possible to slidably fit the convex portion (bayonet claw) 58c necessary for the lens barrel structure into the circumferential groove (bayonet groove) 52e intersecting with the rectilinear groove 52g, thereby performing a reliable forward / backward movement. A small lens barrel can be realized.

  In the lens barrel 3, the rectilinear groove 52g intersects the circumferential groove 52e, but the cam follower 55b1 can enter the rectilinear groove 52g from the circumferential groove 52e without necessarily having the intersecting portion. It is possible to apply.

  The lens barrel of the present invention is used as a small lens barrel capable of effectively controlling the circumferential groove (bayonet mechanism portion) and the rectilinear groove provided in the lens barrel and controlling the driving of other frame members. Is possible.

It is a cross-sectional view including the optical axis in the state of the barrier closed and the lens barrel retracted of the camera having the lens barrel which is an embodiment of the present invention. FIG. 2 is an exploded perspective view of a barrier device including a front cover, a lens barrier, and a barrier driving unit of the camera of FIG. It is a disassembled perspective view of the front main body of the camera of FIG. 1, a fixed frame, and a drive unit. FIG. 2 is an exploded perspective view of a part of a lens barrel of the camera of FIG. 1. It is a disassembled perspective view of the other part of the lens barrel of the camera of FIG. It is the perspective view which looked at the state which removed the barrier cap of the barrier device of the camera of Drawing 1 from the front side. It is the perspective view which looked at the barrier device of Drawing 6 from the back side. It is a front view of the barrier apparatus of FIG. It is a rear view of the barrier apparatus of FIG. FIG. 2 is a front view of a state in which a front metal cover is removed in a state where the lens barrier of the camera of FIG. 1 is closed. It is a front view of the state which removed the barrier cap from the state of FIG. 10 of the camera of FIG. It is a front view of the state which removed the front metal cover in the lens barrier open state of the camera of FIG. It is AA sectional drawing of FIG. FIG. 7 is a front view showing one operation state of the barrier device of FIG. 6, showing a state when the movement of the lens barrier in the closing direction is inadvertently prevented by an external force. FIG. 2 is a cross-sectional view including an optical axis in a state where the barrier of the camera of FIG. 1 is closed and the lens barrel is retracted. FIG. 2 is a cross-sectional view of a surface (a surface below the optical axis) including a barrier body / barrier base contact portion in a state in which the camera of FIG. FIG. 2 is a cross-sectional view including an optical axis in a state where a lens barrel is retracted with the barrier of the camera of FIG. 1 open. FIG. 2 is a cross-sectional view including an optical axis in a state of a lens barrel tele with the barrier of the camera of FIG. 1 open. FIG. 6 is a longitudinal sectional view including an optical axis in a wide state of the lens barrel of FIGS. The state where the periphery of the central opening of the flare stop of the lens barrel in FIGS. 4 and 5 is pushed forward is shown. 6 shows a state in which the periphery of the central opening of the flare stop of the lens barrel of FIGS. 4 and 5 are exploded views of the inner peripheral surface of the fixed frame of the lens barrel and the barrel drive gear, and a partial development view of the outer peripheral gear portion, the helicoid screw (male), and the convex portion of the rotary moving frame is shown superimposed. FIG. 22 (A) shows the state of the lens barrel in the initial stage of driving when the camera of FIG. 1 is in the barrier closed and lens barrel retracted state. FIG. 22B shows the state of the lens barrel when the camera of FIG. 1 is in the barrier open state, the lens barrel retracted state, and the lens barrel extended state (wide state), and FIG. Indicates the state of the lens barrel when the camera changes from the lens barrel wide state to the tele state. FIG. 6 is a development view of an operating state as seen from the inner peripheral side in which the cam follower of the cam frame and the cam groove of the rectilinear frame are overlapped with the development of the inner peripheral part of the rotationally moving frame of the lens barrel of FIGS. It is a figure which shows the barrier open / collapsed state from the closed / collapsed state, the barrier open / feeding initial state, the barrier open / feeding completed state, and the barrier open / zoom state (tele state). 6 is a developed view of the cam follower and cam groove of the cam frame of the lens barrel of FIGS.

Explanation of symbols

52... Rotational movement frame (third frame)
52f, 52g
… (Straight groove)
52d, 52e
... (circumferential groove)
55 ... Cam frame (second frame)
55a ... Cam follower (second cam follower)
55b0, 55b1
... Cam follower (first cam follower)
58… Straight frame (first frame)
58b, 58c
... convex part 58d ... cam groove

Agent Patent Attorney Susumu Ito

Claims (3)

A first frame formed in a cylindrical shape, having a convex portion extending in the radial direction, and having a cam groove;
A first cam follower and a second cam follower that engages with the cam groove and slides on the cam groove, and moves in the axial direction of the cylindrical shape relative to the first frame. The second frame,
It said second frame to move the first cam follower for driving in the axial direction and straight groove you dynamic drive in the circumferential direction and the axial direction together with the first frame, to the first frame A circumferential groove that slidably contacts with the convex portion for relative rotation, the linear groove is continuously provided from the circumferential groove, and the first cam follower is disposed in the linear groove. A third frame capable of relative movement;
A lens barrel characterized by comprising:   The said 1st cam follower is provided with two or more, the said several said rectilinear advance groove | channel corresponding to this is provided, and one of the said rectilinear advance groove | channels cross | intersects the said circumferential groove | channel. Lens barrel.   A plurality of the convex portions are provided, and one of the convex portions is provided at a position different from the remaining convex portion in the axial direction, and the circumferential groove is further provided at a position corresponding to the one convex portion. The lens barrel according to claim 1, wherein the lens barrel is formed.

Images