JP4253596B2 - Lens barrel and camera - Google Patents

Description

  The present invention relates to a lens barrel and a camera, in particular, a lens barrel that performs a feeding operation and a feeding operation between a retracted position and a photographing position, and a camera including the lens barrel, and particularly at the tip of the lens barrel. The present invention relates to a barrier opening / closing mechanism provided.

  Conventionally, in a camera or the like for taking a photo, etc., when not in use (when not taking a picture), the lens barrel holding the taking optical system is disposed at a predetermined retracted position by retracting and storing inside the camera body, It is generally practical to have a retractable lens barrel configured so that the lens barrel in the retracted position is extended from the inside of the camera body and moved to a predetermined shooting position when in use (when shooting). Has become popular.

  Further, in a camera having a retractable lens barrel as described above, when the lens barrel is in the retracted position, it is disposed at a closed position that blocks the optical path of the photographing optical system, and when the lens barrel is in the photographing position. Conventionally, a lens barrier that can open and close the optical path of the lens barrel (imaging optical system) at a predetermined position on the distal end side of the lens barrel so that it can be disposed at an open position retracted from the optical path is also known. More commonly used and widely used.

  In this case, various open / close mechanisms for opening and closing the lens barrier have been proposed in the past, for example, in Japanese Patent Laid-Open Nos. 7-159855, 7-20369, and 3370401. It has been put into practical use.

  In the cameras disclosed in Japanese Patent Application Laid-Open Nos. 7-159855 and 7-20369, an annular barrier opening / closing ring is disposed at the tip of the lens barrel, and the barrier opening / closing ring is provided. The lens blades are rotated around the optical axis of the lens barrel in conjunction with the feeding and retracting operation of the lens barrel, thereby opening and closing the barrier blades of the lens barrier.

  Further, the barrier opening / closing ring in the camera disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-159855 is integrally formed with an arm portion extending toward the inside of the lens barrel. Correspondingly, a rotating cam plate is provided inside the lens barrel, which is driven when the lens barrel advances and retreats in the direction along the optical axis. The rotating cam plate is formed with an arm portion extending forward so as to face the extending direction of the arm portion of the barrier opening / closing ring.

  Therefore, when the rotating cam plate moves in a direction along the optical axis of the lens barrel, the arm portion engages with the arm portion of the barrier opening / closing ring and rotates the barrier opening / closing ring in a predetermined direction. become. The lens barrier is opened and closed as the barrier opening / closing ring rotates.

  On the other hand, in the lens barrel of the camera disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-20369, driving of a driving motor provided for moving a photographing optical system in a direction along the optical axis to perform a focusing operation The lens barrier can be driven using force.

  In this case, a barrier driving gear having one end meshed with the barrier opening / closing ring and the other end extending toward the inside of the lens barrel is disposed near the tip of the lens barrel, and the barrier opening / closing via the barrier driving gear. The ring and the lens barrel are arranged so as to be connected to a driving mechanism including a plurality of gears. Accordingly, when the drive motor of the drive mechanism rotates, the barrier drive ring rotates. As the barrier opening / closing ring rotates, the barrier blades of the lens barrier are opened and closed.

On the other hand, the lens barrier mechanism of the camera disclosed by the above-mentioned Japanese Patent No. 3370401 includes four barrier blades at the tip of the lens barrel and a barrier that moves the barrier blades between an open position and a closed position. In this case, the barrier blades are arranged closer to the front than the arrangement position of the barrier driving member.
JP-A-7-159855 Japanese Patent Laid-Open No. 7-20369 Japanese Patent No. 3370401

  However, in the means disclosed in Japanese Patent Laid-Open No. 7-159855 and Japanese Patent Laid-Open No. 7-20369, an annular member (barrier opening / closing ring) that rotates around the optical axis at the tip of the lens barrel. Therefore, it is necessary to arrange so that the barrier blade can smoothly open and close without interfering with the barrier opening and closing ring. Therefore, according to such a member arrangement, it is necessary to secure an arrangement space at the retracted position of the barrier blade, which causes the lens barrel to be enlarged.

  Further, in the means according to the above-mentioned Japanese Patent Application Laid-Open No. 7-159855, since the arm portion is extended from the barrier opening / closing ring toward the inside of the lens barrel, the optical axis of the arm portion is inside the lens barrel. It is necessary to secure a movement space in the direction along the direction and the direction of rotation. Therefore, this also becomes a cause of hindering downsizing of the lens barrel.

  Furthermore, since it is necessary to drill a hole through which the arm portion is inserted into the lens barrel in a member constituting the tip portion of the lens barrel, for example, dust is introduced from the hole portion into the lens barrel. Etc. may intrude. In addition to this, when such a configuration is adopted, there is also a problem that it is difficult to realize a dustproof and waterproof structure of the lens barrel.

  On the other hand, the means disclosed by the above-mentioned Japanese Patent Application Laid-Open No. 7-20369 is driven through a barrier drive gear in addition to the same problems as the above-mentioned problems that can be caused by the means according to the above-mentioned Japanese Patent Application Laid-Open No. 7-159855. Since the driving force of the drive motor of the mechanism is transmitted to the barrier opening / closing ring and is rotated, there is a possibility that malfunction will occur if dust or the like enters the parts connected using the gear. Conceivable.

  In addition, since the drive mechanism composed of a plurality of gears and the like is arranged inside the lens barrel, it is necessary to secure a space for arranging a large number of members. It is also a factor that obstructs.

  On the other hand, in the case of a lens barrel that employs a photographing optical system having a photographing range with a relatively wide angle of view, the range of the incident light beam becomes wide, and therefore it is necessary to enlarge the opening on the front side of the lens barrel. In this case, if the configuration in which the barrier member is disposed at the most distal portion of the lens barrel as in the lens barrier mechanism of the camera disclosed in Japanese Patent No. 3370401, the barrier blade itself is also enlarged. Need arises. Then, the space for disposing the barrier blades at the open position where the barrier blades are retracted from the optical path also becomes large, so that there is a problem that the lens barrel itself becomes large.

  Therefore, it is conceivable to increase the number of barrier blades in order to shield the large opening and reduce the retreat space. However, there is a problem that a more complicated mechanism is required to open and close a plurality of barrier blades with certainty.

  The present invention has been made in view of the above-described points, and an object of the present invention is to perform an opening / closing operation of moving between a closed position where the optical path of the photographing optical system is shielded and an open position where the optical path is retracted from the optical path. Provided is a lens barrel having a lens barrier opening / closing mechanism capable of suppressing an increase in size while also ensuring reliability that can be reliably executed with a simple configuration, and a camera equipped with the lens barrel considering a dustproof and waterproof structure. It is.

In order to achieve the above object, the lens barrel according to the present invention is a lens barrel that performs a feeding operation and a feeding operation between the retracted position and the photographing position, and is arranged at the tip when it is most extended. A first feeding step unit that is positioned, a first frame member that is included in the feeding step unit and that moves forward and backward in the direction along the optical axis of the photographic optical system without rotating in accordance with the feeding operation and the feeding operation; Along with the feeding operation and the feeding operation included in the unit, the photographing optical system moves forward and backward in the direction along the optical axis of the photographing optical system integrally with the first frame member, and the photographing optical with respect to the first frame member. A second frame member that rotates relatively around the optical axis of the system, a closed position that is disposed on the first frame member and blocks the optical path of the photographing optical system, and retracts from the optical path of the photographing optical system At least one pair of barrier blades moving between open positions A barrier blade driving member disposed on the first frame member and rotating around the optical axis of the photographing optical system to open and close the barrier blade; and light of the photographing optical system of the second frame member the rotational force to around the axis and tool Preparations and driving force transmitting unit, the transmitting to the barrier blade driving member, the pair of barrier blades, the imaging optical system adjacent to a distal end thereof the first frame member It is pivotally supported by a pair of shaft members protruding forward in the direction along the optical axis .

  According to the present invention, it is possible to reliably perform an opening / closing operation for moving between a closed position for shielding an optical path of a photographing optical system and an open position for retracting from the optical path with a simple configuration, while ensuring reliability. It is possible to provide a lens barrel that includes a lens barrier opening / closing mechanism that can prevent the formation of a lens, and that takes into account a dustproof and waterproof structure, and a camera including the lens barrel.

The present invention will be described below with reference to the illustrated embodiments.
FIG. 1 is an external perspective view schematically showing a camera according to an embodiment of the present invention. 2 to 5 are exploded perspective views showing a lens barrel provided in the camera of FIG. 6 to 8 are sectional views of the lens barrel of the present embodiment, FIG. 6 shows a retracted state of the lens barrel, and FIG. 7 shows a state in which the lens barrel is set to the shortest focal length (wide angle state). FIG. 8 shows a state (telephoto state) in which the lens barrel is set to the longest focal length.

  A camera 1 exemplified in the present embodiment is a small camera including a zoom lens barrel (hereinafter simply referred to as a lens barrel) 2 of a three-stage extension system as shown in FIG.

  The camera 1 includes a camera main body 1a in which various constituent members are disposed inside and on the surface and covered with an exterior member, and photographing optics including a plurality of optical elements fixed to a substantially central portion of the front surface of the camera main body 1a. The lens 2 is composed of a system 2a, a plurality of frame members and a plurality of cylindrical members for holding the system 2a, and the like, and is arranged to be extendable in a direction along the optical axis of the photographing optical system 2a.

  In the camera 1, a finder device used for observing the subject and determining a photographing range, distance information to the subject is obtained, and a distance measuring operation for setting a focusing position of the photographing optical system 2a based on the information. Various devices such as a distance measuring device that contributes to the brightness and a photometric device (not shown) for determining brightness information of the shooting range including the subject and setting the shutter speed and aperture based on the appropriate exposure value The constituent members are arranged.

  On the front side of the camera body 1a, a finder window 1d that is a part of the finder device, a distance measuring window 1e that constitutes a part of the distance measuring device, a photometric window 1f that is a part of the photometric device, and a flash. A light emitting window 1g or the like that is a part of the light emitting device is disposed.

  Further, on the upper surface side and the rear surface side of the camera body 1a, a shutter release button 1b, which is an operation member interlocked with a two-stage switch for starting a distance measuring operation, a photometric operation, and a shutter operation by operating force, is rotated. A plurality of operation members such as a zoom lever 1c, which is an operation member interlocked with a zoom switch for changing the focal length by performing the extension operation or the extension operation of the lens barrel 2, are respectively disposed at predetermined positions. .

  In a state where the camera 1 is not used (non-photographing state; not shown), the lens barrel 2 is stored in a state of being retracted into the camera body 1a. In the following description, the state at this time is particularly referred to as a retracted state, and the position of each component of the lens barrel 2 in this retracted state is referred to as a retracted position (see FIG. 6).

  When the lens barrel 2 is in the retracted position, for example, when a power operation member (not shown) linked to the power switch is operated, the camera 1 is activated and shifts to the photographing state. At this time, the lens barrel 2 is drawn forward from the retracted position and is disposed at a predetermined initial position, that is, a photographing position. In this case, the initial photographing position is, for example, a wide-angle position that is a state when the shortest focal length is set. In the following description, this state is referred to as a wide-angle state (see FIG. 7).

  Next, when the zoom lever 1c interlocked with the zoom switch for further zooming is operated from this state, the lens barrel 2 is further advanced forward, and the lens barrel 2 is in the most extended state. The lens barrel 2 is set to the telephoto position where the longest focal length is set. In the following description, this state is referred to as a telephoto state (see FIGS. 1 and 8).

  Then, the lens barrel 2 is adapted to perform a shooting operation and a drawing operation between the wide-angle position and the telephoto position, so that a photographing operation can be performed at a desired position. In the following description, the position of each component of the lens barrel 2 in this region is referred to as a photographing position.

  Therefore, the lens barrel 2 provided in the camera 1 of the present embodiment is configured to perform a feeding operation and a feeding operation between a predetermined retracted position and a photographing position. More specifically, the lens barrel 2 becomes a photographing position when it is extended from the retracted position and set to the wide angle position, and can be expanded and contracted by the extending operation and the retracting operation between the wide angle position and the telephoto position. Yes.

  Next, a detailed configuration of the lens barrel 2 included in the camera 1 of the present embodiment will be described below with reference to FIGS.

  As described above, the lens barrel 2 includes the photographing optical system 2a (see FIG. 1) composed of a plurality of optical elements (16a, 17a, 18a; see FIG. 6), and a plurality of frame members (16, 17) holding the same. , 18) and a plurality of cylindrical members (11, 12, 13, 14, 15; see FIGS. 2 to 6) and other components, and the optical axis of the photographing optical system 2a (FIG. 1). It is configured to be extendable by a drawing operation and a drawing operation within a predetermined range, that is, from a retracted position to a telephoto position through a wide angle position.

  More specifically, the lens barrel 2 includes a fixed frame 11 (FIG. 2) fixed at a predetermined position of the camera body 1 a (see FIG. 1) and an inner peripheral side of the fixed frame 11. And a rotating frame 12 (FIG. 2) disposed so as to be rotatable around the optical axis and to be movable back and forth in the direction along the optical axis, and on the inner peripheral side of the rotating frame 12. 3 and a moving frame 13 (FIG. 3) disposed in a direction along the optical axis, and arranged on the inner peripheral side of the moving frame 13 so as to be rotatable around the optical axis and to be movable in a direction along the optical axis. The second cam frame 14 (FIG. 3) provided, and the photographing optical system 2a integrally with a later-described first group frame 16 on the inner peripheral side of the second cam frame 14 along with the feeding operation and the feeding operation. Is movable in a direction along the optical axis of the optical system 2 and is arranged to rotate relative to the first group frame 16 around the optical axis of the photographing optical system 2a. A first cam frame 15 (FIG. 4) that is a second frame member, and a lens group that is a plurality of optical elements that are on the inner peripheral side of the first cam frame 15 and constitute the photographing optical system 2a (FIG. 1). A first frame that holds the first lens group 16a (FIG. 6) and is disposed so as to be movable back and forth in the direction along the optical axis of the photographing optical system 2a without rotating in accordance with the extending operation and the retracting operation. The first group frame 16 (FIG. 4), which is a member, is provided on the inner peripheral side of the first cam frame 15 and behind the first group frame 16 so as to be movable forward and backward along the optical axis. A shutter unit 19 comprising a mechanism and a second group frame 17 (FIG. 6) described later, and a second lens group among a plurality of lens groups provided on the inner peripheral side of the shutter unit 19 and constituting the photographing optical system 2a (FIG. 1). The lens group 17a (not shown in FIG. 5; see FIG. 6) is held and A second group frame 17 (not shown in FIG. 5; see FIG. 6), a first group frame 16 and a later-described third group frame 18 (see FIG. 5). And a float key 20 that restricts the rotation with the optical axis, and advances and retracts only in the direction along the optical axis, and a plurality of lens groups that are inside the float key 20 and constitute the photographing optical system 2a (FIG. 1). Each frame member such as a third group frame 18 (FIG. 5) that holds the third lens group 18a is configured.

  The fixed frame 11 (FIG. 2) is a cylindrical member fixed at a predetermined position of the camera body 1a (see FIG. 1). A female helicoid 11 a is formed on the inner peripheral surface of the fixed frame 11. The male helicoid portion 12a of the rotating frame 12 is screwed into the female helicoid 11a. As a result, the fixed frame 11 and the rotating frame 12 are helicoidally coupled, and the rotating frame 12 moves forward and backward along the optical axis while rotating around the optical axis with respect to the fixed frame 11.

  A plurality of rectilinear grooves 11b are formed on the inner peripheral surface of the fixed frame 11 with a predetermined interval on the peripheral surface, and each rectilinear groove 11b is formed in a direction along the optical axis. A rectilinear key 13a of the moving frame 13 is engaged with the rectilinear groove 11b. As a result, the rotation of the moving frame 13 with respect to the fixed frame 11 is restricted, and the moving frame 13 advances and retreats in the direction along the optical axis.

  A light shielding rubber 21 having a light shielding function and a dustproof and waterproof function is disposed at the front edge of the fixed frame 11. A lens position detection switch 11c is disposed at a predetermined position near the front end and the rear end of the rectilinear groove 11b. As a result, the straight key 13a of the moving frame 13 acts on the lens position detection switch 11c, thereby detecting the positions of both ends of the moving frame 13 during the extending and retracting operations, and driving the lens barrel 2 with high accuracy. At the same time, the movable range of the lens barrel 2 is regulated.

  The rotating frame 12 (FIG. 2) is formed of a cylindrical member that is disposed on the inner peripheral side of the fixed frame 11 so as to be movable forward and backward along the optical axis and rotatable about the optical axis. .

  A male helicoid portion 12a and a gear portion 12b are formed on the rear end edge of the outer peripheral side of the rotary frame 12. The male helicoid portion 12a is screwed into the female helicoid 11a of the fixed frame 11. As a result, the rotating frame 12 and the fixed frame are helicoidally coupled.

  Further, a drive gear (not shown) constituting a part of the drive mechanism meshes with the gear portion 12b. As a result, the rotational driving force of the drive motor is transmitted to the rotary frame 12. Therefore, when the rotary frame 12 is rotated by receiving the rotational driving force of the drive motor, the rotary frame 12 moves forward and backward along the optical axis while rotating around the optical axis with respect to the fixed frame 11.

  On the other hand, on the inner peripheral side of the rotary frame 12, a plurality of rectilinear grooves 12c are formed at predetermined intervals on the peripheral surface, and each rectilinear groove 12c is formed in a direction along the optical axis. A cam pin 14a of the second cam frame 14 is engaged with the rectilinear groove 12c via a cam pin insertion groove 13d of the moving frame 13. As a result, the rotational driving force of the rotary frame 12 is transmitted to the second cam frame 14.

  Therefore, when the rotating frame 12 rotates, the rotating frame 12 itself moves forward and backward in the direction along the optical axis while rotating around the optical axis, and accordingly, the second cam frame 14 rotates in the direction along the optical axis while rotating around the optical axis. To come and go. At this time, since the cam pin 14a is inserted through the cam pin insertion groove 13d, the cam pin 14a moves along this.

  Further, a decorative ring 22 and a light shielding rubber 23 having a light shielding function and a dustproof / waterproof function are disposed at the front edge of the rotary frame 12.

  The moving frame 13 (FIG. 3) is disposed on the inner peripheral side of the rotating frame 12 so as to be rotatable around the optical axis with respect to the rotating frame 12 and integrally move in a direction along the optical axis. It consists of a cylindrical member.

  A plurality of rectilinear keys 13 a are formed at the rear end edge of the outer peripheral side of the moving frame 13 so as to protrude outward at a predetermined interval on the peripheral surface. The rectilinear key 13a is engaged with the rectilinear groove 11b of the fixed frame 11. As a result, the movement frame 13 is restricted from rotating around the optical axis, and moves forward and backward only in the direction along the optical axis.

  Further, in the vicinity of the rear edge of the outer peripheral side of the moving frame 13 and in the vicinity of the rectilinear key 13a, a plurality of engaging claws 13e project at predetermined intervals on the peripheral surface in the same manner as the rectilinear key 13a. Has been. The engaging claw 13e engages with a circumferential groove 12e (see FIG. 8) provided on the inner peripheral side near the rear end of the rotating frame 12, so that the movable frame 13 and the rotating frame 12 are bayonet-coupled. It has become. As a result, the moving frame 13 moves forward and backward in the direction along the optical axis integrally with the rotary frame 12, and is rotatable relative to the rotary frame 12 around the optical axis. That is, when the rotating frame 12 moves in the direction along the optical axis while rotating, the moving frame 13 moves together with the rotating frame 12 in the direction along the optical axis without rotating.

  On the other hand, a female helicoid 13 b is formed on the inner peripheral surface of the moving frame 13. The female helicoid 13b is helicoidally coupled to the male helicoid 14b of the second cam frame 14. As a result, when the second cam frame 14 rotates relative to the moving frame 13, the second cam frame 14 advances and retreats in the direction along the optical axis with respect to the moving frame 13.

  A plurality of rectilinear grooves 13c are formed on the inner peripheral surface of the moving frame 13 at predetermined intervals on the peripheral surface, and each rectilinear groove 13c is formed in a direction along the optical axis. A rectilinear key 20d of the float key 20 is engaged with the rectilinear groove 13c. As a result, the moving frame 13 restricts the float key 20 from rotating, and the float key 20 can move forward and backward along the optical axis.

  A plurality of cam pin insertion grooves 13 d are formed on the peripheral surface of the moving frame 13 with a predetermined interval. As described above, the cam pin 14a of the second cam frame 14 is inserted into the cam pin insertion groove 13d, and the cam pin 14a is engaged with the rectilinear groove 12c of the rotary frame 12. Yes.

  The second cam frame 14 (FIG. 3) is formed of a cylindrical member that is disposed on the inner peripheral side of the moving frame 13 so as to be rotatable around the optical axis and to be movable back and forth along the optical axis. It is.

  A plurality of cam pins 14 a are planted at a predetermined interval on the peripheral surface of the rear end edge portion of the outer peripheral side of the second cam frame 14. As described above, the cam pin 14a is engaged with the rectilinear groove 12c of the rotating frame 12 through the cam pin insertion groove 13d of the moving frame 13. Thereby, the second cam frame 14 rotates around the optical axis together with the rotation frame 12 when the rotation frame 12 rotates.

  A male helicoid 14 b is formed at the rear end edge of the outer peripheral side of the second cam frame 14. As described above, the male helicoid 14b is helicoidally coupled to the female helicoid 13b of the moving frame 13. As a result, when the second cam frame 14 rotates together with the rotating frame 12, the second cam frame 14 advances and retreats in the direction along the optical axis while rotating around the optical axis with respect to the moving frame 13.

  A plurality of rectilinear grooves 14c are formed at predetermined intervals on the inner peripheral surface of the second cam frame 14, and each rectilinear groove 14c is formed in a direction along the optical axis. Yes. A guide protrusion 15a of the first cam frame 15 is engaged with the rectilinear groove 14c.

  Further, a female helicoid 14 d is formed on the inner peripheral surface of the second cam frame 14. The female helicoid 14d is helicoidally coupled to the male helicoid 16b of the first group frame 16. Thereby, when the second cam frame 14 rotates, the first group frame 16 advances and retreats in the direction along the optical axis.

  Therefore, the second cam frame 14 formed as described above advances and retracts in the direction along the optical axis with respect to the moving frame 13 while rotating around the optical axis in response to the rotational driving force of the rotary frame 12. To do. At this time, the first group frame 16 that is helicoidally coupled to the second cam frame 14 advances and retreats in the direction along the optical axis with respect to the second cam frame 14.

  A plurality of three-group cams 14e are formed on the inner peripheral surface of the second cam frame 14 at a predetermined interval on the peripheral surface. A third group pin 18b of a third group frame 18 described later is engaged with the third group cam 14e via a third group rectilinear groove 20c of the float key 20. As a result, the second cam frame 14 and the third group frame 18 are cam-coupled, and when the second cam frame 14 rotates, the third group frame 18 is advanced and retracted in the direction along the optical axis. Yes.

  A decorative ring 24 and a light-shielding rubber 25 having a light-shielding function and a dustproof / waterproof function are disposed at the front edge of the second cam frame 14.

  The first cam frame 15 (FIG. 4) is formed of a cylindrical member that is disposed on the inner peripheral side of the second cam frame 14 so as to be movable back and forth in the direction along the optical axis. The first group frame 16 is rotatable relative to the optical axis around the first group frame 16 and can move forward and backward integrally with the first group frame 16 in the direction along the optical axis.

  A plurality of guide protrusions 15 a are formed on the outer peripheral side rear end edge of the first cam frame 15 at a predetermined interval on the peripheral surface. As described above, the guide protrusion 15a is engaged with the rectilinear groove 14c of the second cam frame 14. As a result, the first cam frame 15 is restricted from rotating with respect to the second cam frame 14 and rotates together with the second cam frame 14. At the same time, the direction along the optical axis is movable forward and backward with respect to the second cam frame 14.

  A plurality of second group cam grooves 15 b are formed on the inner peripheral surface of the first cam frame 15 at a predetermined interval. A second group pin 19 a provided on the outer peripheral surface of the shutter unit 19 is engaged with the second group cam groove 15 b via a second group rectilinear groove 16 d of the first group frame 16.

  Further, on the inner peripheral side of the front end edge portion of the first cam frame 15, a pair of pressing portions 15 c protrudes inward at positions facing each other. The pressing portion 15c (a part of the driving force transmission unit (34; see FIG. 9)) is a barrier driving ring 27c (a part of a lens barrier 27 described later when the first cam frame 15 rotates). The barrier drive ring 27c is rotated by contacting the pressed portion 27ca (part of the driving force transmitting portion (34; see FIG. 9)) of the barrier blade driving member and pressing it in the rotating direction. It has become. As a result, the lens barrier 27 is opened and closed. The detailed configuration of the lens barrier 27 will be described later.

  A waterproof rubber 26, which is a waterproof member having a dustproof and waterproof function, is disposed at the leading edge of the first cam frame 15.

  That is, the waterproof rubber 26 is provided in the vicinity of the front end edge of the first cam frame 15 (second frame member) and the first group frame 16 (first frame member) and the first cam frame 15 (second frame). The frame member is disposed at a predetermined position closer to the first lens group 16a (optical element) than the pressed portion 27ca. The waterproof rubber 26 serves to keep the space between the first group frame 16 (first frame member) and the first cam frame 15 (second frame member) watertight.

  On the other hand, the first group frame 16 (FIG. 4) has a substantially cylindrical shape that is disposed on the inner peripheral side of the first cam frame 15 and is movable in the direction along the optical axis with respect to the second cam frame 14. The frame member is composed of a member and is disposed at the most distal portion of the lens barrel 2 together with the first cam frame 15. In other words, the first cam frame 15 (second frame member) is disposed outside the first group frame 16 (first frame member) (see FIG. 4 or FIG. 6).

  A first lens group 16 a (FIG. 6) is held inside the vicinity of the tip of the first group frame 16. That is, the first lens group 16a is an optical element that is disposed on the first group frame 16 (first frame member) and constitutes a part of the photographing optical system.

  A male helicoid 16 b is formed on the rear end edge of the outer peripheral side of the first group frame 16. The male helicoid 16b is helicoidally coupled to the female helicoid 14d of the second cam frame 14. As a result, the first group frame 16 advances and retreats in the direction along the optical axis as the second cam frame 14 rotates.

  The male helicoid 16b of the first group frame 16 is formed to have a slightly larger diameter than the outer peripheral surface of the cylindrical portion. The first cam frame 15 is disposed so as to cover the outer surface of the cylindrical portion of the first group frame 16, and the rear end edge portion of the cam frame 15 comes into contact with the front side wall portion of the male helicoid 16b. ing.

  Further, a plurality of engaging claws 16 e are projected on the outer peripheral surface of the first group frame 16 at a predetermined interval in the vicinity of the male helicoid 16 b of the first group frame 16. The engaging claw 16e engages a circumferential groove (not shown) provided on the inner peripheral side near the rear end of the first cam frame 15 to thereby connect the first group frame 16 and the first cam frame 15 together. The bayonet is connected. As a result, the first group frame 16 advances and retracts in the direction along the optical axis integrally with the first cam frame 15, and is rotatable relative to the first cam frame 15 around the optical axis. That is, when the first group frame 16 is moved in the direction along the optical axis by receiving the rotational force by the helicoid coupling with the second cam frame 14, the first cam frame 15 is driven by the second cam frame 14 to rotate. It moves in a direction along the optical axis together with the first group frame 16 while moving.

  A plurality of rectilinear guides 16c and second group rectilinear grooves 16d are formed on the cylindrical portion of the first group frame 16 at predetermined intervals on the circumferential surface. Of these, the first group straight guide piece 20b of the float key 20 (FIG. 5) is engaged with the straight guide 16c. Thereby, the rotation of the first group frame 16 is restricted by the float key 20, and the first group frame 16 is guided so as to advance and retreat in the direction along the optical axis.

  Further, a rectilinear key 19b in which the second group pin 19a of the shutter unit 19 including the second group frame 17 is implanted is engaged with the second group rectilinear groove 16d. Thereby, the shutter unit 19 including the second group frame 17 is restricted from rotating around the optical axis with respect to the first group frame 16. Further, the second group pin 19a is adapted to engage with the second group cam groove 15b of the first cam frame 15 as described above. Thus, when the first cam frame 15 rotates around the optical axis, the shutter unit 19 does not rotate with respect to the first group frame 16 due to the cam coupling of the second group pin 19a and the second group cam groove 15b. Move forward and backward along the axis.

  That is, when the second cam frame 14 rotates, the first group frame 16 advances and retreats in the direction along the optical axis by helicoid coupling. Along with this, the first cam frame 15 advances and retreats in the direction along the optical axis together with the first group frame 16, and rotates around the optical axis together with the second cam frame 14. At this time, the rotation of the first cam frame 15 and the operation in the forward / backward direction are transmitted to the shutter unit 19 having the second group frame 17 via the second group pin 19a, and the shutter unit 19 is used as the optical axis. It moves to the direction along.

  As described above, the first group frame 16 (first frame member) and the first cam frame 15 (second frame member) perform the feeding operation and the feeding operation between the retracted position and the photographing position. The lens barrel 2 constitutes a feeding stage unit located at the tip when the lens barrel 2 is in the most extended state. Of these, the first group frame 16 is provided as a first frame member that advances and retreats in the direction along the optical axis of the photographing optical system without rotating in accordance with the drawing operation and the drawing operation of the lens barrel 2. . The first cam frame 15 is integrated with the first group frame 16 (first frame member) along the optical axis of the photographing optical system as the lens barrel 2 is extended and retracted. And a second frame member that rotates relative to the first group frame 16 (first frame member) around the optical axis of the photographing optical system.

  Further, a barrier decoration 28, an opening mask 29, a lens barrier 27, and the like are arranged in order from the front side at the front end of the first group frame 16.

  Among these, the lens barrier 27 (FIG. 4) has a predetermined closed position and a predetermined open position corresponding to the lens barrel 2 performing a drawing operation and a drawing operation between the retracted position and the photographing position. It is configured to move between. Thereby, the optical path of the photographing optical system of the lens barrel 2 is blocked or opened.

  That is, when the lens barrier 27 is in the closed position, the front surface of the photographing optical system of the lens barrel 2 is covered to thereby cover and protect the front surface of the photographing optical system of the lens barrel 2. . Further, when the lens barrier 27 is in the open state, the photographing light flux is not inhibited by the lens barrier 27 by retracting from the optical path of the lens barrel 2.

  The lens barrier 27 covers the front surface of the photographing optical system and supports an annular barrier lid 27a that supports each component of the main lens barrier 27 from the front side, and the photographing optical system 2a according to the state of the main lens barrel 2. A pair of barrier blades 27x (a first barrier blade 27d and a first barrier blade 27d) that move between a closed position that blocks the optical path in FIG. 1 and an open position that retreats from the optical path of the photographing optical system 2a and is configured by a plurality of blade members. 2 barrier blades 27e), a barrier drive ring 27c that transmits the driving force in the rotational direction of the first cam frame 15 to the barrier blades 27x, and the pair of barrier blades by energizing the barrier drive ring 27c. A barrier opening spring 27b which is a pair of urging members for urging 27x in the opening direction and a barrier closing spring 27f which is a pair of urging members for urging the pair of barrier blades 27x in the closing direction It is constituted by. The detailed configuration of the lens barrier 27 will be described later.

  On the other hand, the float key 20 (FIG. 5) is formed by integrally forming an annular main body portion 20a and a plurality of first group rectilinear guide pieces 20b extending forward from the main body portion 20a. The group frame 16 and the third group frame 18 are caused to advance and retreat in the direction along the optical axis and to restrict their rotation.

  Among these, the first group linearly-moving guide piece 20b is formed by a member having a substantially arc-shaped cross section, and is provided so as to extend forward from the inner peripheral edge portion of the main body portion 20a. In addition, a plurality of the first group rectilinear guide pieces 20b are arranged at a predetermined interval on the peripheral surface with respect to the inner peripheral edge portion of the main body portion 20a. Each first group rectilinear guide piece 20b is engaged with the rectilinear guide 16c of the first group frame 16 from the inner peripheral side. As a result, the first group linear guide piece 20b guides the movement of the first group frame 16 in the direction along the optical axis.

  Each of the first group rectilinear guide pieces 20b is formed with a third group rectilinear groove 20c having a long side in the direction along the optical axis. The front end side of the third group rectilinear groove 20c is formed from a predetermined position closer to the front than the middle of the first group rectilinear guide piece 20b, and the rear end side reaches the base of the first group rectilinear guide piece 20b. It is formed between the parts reaching the inner peripheral surface of the main body 20a. Then, the straight key 18c of the third group frame 18 is engaged with the third group straight groove 20c. Thus, the third group rectilinear groove 20c guides the movement of the third group frame 18 in the direction along the optical axis.

  On the other hand, the main body portion 20a is formed of a substantially ring-shaped member, and a plurality of rectilinear keys 20d are provided on the outer peripheral surface of the main body portion 20a so as to protrude outward at a predetermined interval on the peripheral surface. The rectilinear key 20d is adapted to engage with the rectilinear groove 13c of the moving frame 13. Thereby, the float key 20 is restricted by the moving frame 13 and is guided along the optical axis by moving along the rectilinear groove 13c.

  A plurality of engaging claws 20e are provided on the outer peripheral surface of the main body 20a and in the vicinity of each of the linear keys 20d, with a predetermined interval on the peripheral surface, similar to the linear key 20d. The engaging claw 20e engages a circumferential groove 14f (see FIG. 6) provided on the inner peripheral side near the rear end of the second cam frame 14, thereby connecting the float key 20 and the second cam frame 14 to a bayonet. It is supposed to be combined. As a result, the float key 20 advances and retreats in the direction along the optical axis integrally with the second cam frame 14, and is relatively rotatable around the optical axis. That is, in this case, the float key 20 does not rotate when the second cam frame 14 rotates, and the float key 20 also moves together when the second cam frame 14 moves in the direction along the optical axis. It becomes like this.

  A flare stop 32 is fixed to the rear end surface of the float key 20 by a fastening member 33 such as a screw. The flare stop 32 is a light-shielding member that serves to block only unnecessary light beams from the light beams transmitted through the photographing optical system and transmit unnecessary light beams.

  The flare diaphragm 32 is attached to a predetermined position of the float key 20 after the third group frame 18 is disposed inside the float key 20.

  As described above, the shutter unit 19 is a unit having a substantially cylindrical shape including the shutter mechanism and the focus mechanism (not shown) and the second group frame 17 (not shown in FIG. 5; see FIG. 6). The shutter unit 19 is disposed so as to be movable back and forth in the direction along the optical axis on the inner peripheral side of the first cam frame 15 and behind the first group frame 16.

  A plurality of second group pins 19a are planted at a predetermined interval on the peripheral surface at a predetermined position near the outer periphery of the shutter unit 19. The second group pin 19a is engaged with the second group cam groove 15b of the first cam frame 15 via the second group rectilinear groove 16d of the first group frame 16, so that the shutter unit 19 and the first cam frame 15 are engaged with each other. The cam is connected. As a result, the rotational force of the first cam frame 15 is transmitted to the shutter unit 19 and the second group frame 17 inside thereof.

  Further, a light shielding bellows 30 is provided between the front end edge of the shutter unit 19 and the first group frame 16 so as to be extendable and contractable. That is, one end of the light shielding bellows 30 is fixed to the front end edge of the shutter unit 19, and the other end is fixed to a predetermined position inside the first group frame 16. Therefore, when the lens barrel 2 is extended or retracted and the shutter unit 19 (second group frame 17) and the first group frame 16 are relatively separated from each other, the light shielding bellows 30 is extended. It has become. Further, when the retracting operation is performed and the shutter unit 19 (second group frame 17) and the first group frame 16 are relatively close to each other, the light shielding bellows 30 contracts. Thus, the light shielding bellows 30 is extended and contracted as shown in FIGS.

  The second group frame 17 (not shown in FIG. 5; see FIG. 6) included in the shutter unit 19 holds the second lens group 17a among the plurality of lens groups constituting the photographing optical system as described above. A frame member that is disposed inside the shutter unit 19 and is driven forward and backward in the direction along the optical axis in the shutter unit 19 by a drive mechanism (not shown). The focusing operation of the photographing optical system 2a is performed by the advance and retreat of the second group frame 17 in the optical axis direction.

  The third group frame 18 (FIG. 5) is an annular frame member arranged on the inner peripheral side of the float key 20, and holds the third lens group 18a among a plurality of lens groups constituting the photographing optical system. It is a frame member.

  At a predetermined position on the outer peripheral side of the third group frame 18, a plurality of third group pins 18b are planted on the peripheral surface with a predetermined interval. The third group pin 18b is cam-coupled to the third group cam 14e of the second cam frame 14 via the third group rectilinear groove 20c of the float key 20. As a result, the third group frame 18 advances and retreats in the direction along the optical axis as the second cam frame 14 rotates.

  Further, on the outer peripheral surface of the third group frame 18, a rectilinear key 18c is formed at each base portion of the third group pin 18b. The rectilinear key 18c is adapted to engage with the third group rectilinear groove 20c of the float key 20. As a result, the third group frame 18 is restricted from rotating and moves only in the direction along the optical axis.

  Then, between the front end surface of the third group frame 18 and the rear end surface of the second group frame 17 in the shutter unit 19, an urging member 31 made of an extensible coil spring or the like is disposed as shown in FIG. Has been. This is provided to remove backlash at the cam coupling portion because both the frames 17 and 18 can be advanced and retracted in the direction along the optical axis by cam coupling.

  A detailed configuration of the lens barrier 27 of the lens barrel 2 included in the camera 1 of the present embodiment configured as described above will be described below mainly using FIG.

  As described above, the lens barrier 27 in the present embodiment is disposed at the distal end portion of the first group frame 16, and when the camera 1 is not used, the lens barrier 27 is in the closed position, and the first lens group 16 a of the first group frame 16. While the front surface of FIG. 6 is protected by being covered with a plurality of barrier blades 27x, when the camera 1 is used, the lens barrier 27 is opened, and the plurality of barrier blades 27x are in the lens barrel 2. It is configured to retreat from the optical path.

  Among the constituent members of the lens barrier 27, the pair of barrier blades 27x are disposed in the vicinity of the distal end portion of the first group frame 16 (first frame member) as described above, and block the optical path of the photographing optical system. It is configured to be movable between a closed position and an open position retracted from the optical path of the photographing optical system.

  Therefore, the pair of barrier blades 27x are in the same state (FIG. 6) as the pair of first barrier blades 27d disposed on the inner peripheral side when the lens barrier 27 is in the closed position (state of FIG. 6). And a pair of second barrier blades 27e arranged on the outer peripheral side in the state of the above).

  The shaft holes 27dd and 27ee formed at one end (each base end) of each of the blade members 27d and 27e constituting the pair of barrier blades 27x are outer peripheral edges of the distal end portion of the first group frame 16. It is planted toward the front in the section, and is pivotally supported with respect to a pair of barrier shafts 16g arranged at positions facing each other on the circumference. In this case, one first barrier blade 27d and one second barrier blade 27e are pivotally supported by one barrier shaft 16g, and both blades 27d and 27e rotate around the one barrier shaft 16g. Thus, the lower half of the optical path in the lens barrel 2 is shielded or opened. Similarly, the other first barrier blade 27d and the other second barrier blade 27e are pivotally supported by the other barrier shaft 16g, and both the blades 27d and 27e rotate around the other barrier shaft 16g. By moving, the upper half of the optical path in the lens barrel 2 is shielded or opened.

  A driven pin 27da is integrally formed at the base end portion of the first barrier blade 27d. This driven pin 27da is made of a shaft-like member, and is arranged so that its central axis is in a direction along the optical axis. One end of the barrier closing spring 27f is locked to the driven pin 27da. As a result, an urging force in a predetermined direction by the barrier closing spring 27f is applied to the first barrier blade 27d, and an urging force is always applied to the first barrier blade 27d toward the closed position.

  Further, a notch-like closing side pressing portion 27db is formed at each tip portion of the first barrier blade 27d. The closing-side pressing portion 27db is a portion that comes into contact with a closing-side driven projection 27ea provided at the tip of the second barrier blade 27e at a predetermined time when the first barrier blade 27d moves in the closing direction. That is, when the closing side pressing portion 27db of the first barrier blade 27d is closed, the second barrier blade 27e comes into contact with the closing side driven protrusion 27ea of the second barrier blade 27e and presses this, thereby the second barrier blade 27e is closed. It is designed to turn toward

  On the other hand, as described above, the closed-side driven projection 27ea is integrally formed at each tip of the second barrier blade 27e. The closed-side driven projection 27ea is made of a shaft-like member, and is arranged so that its central axis is in a direction along the optical axis.

  In addition, an opening-side driven projection 27eb is integrally formed at a middle portion of the outer edge portion of the second barrier blade 27e. The opening-side driven protrusion 27eb is formed of a plate-shaped protrusion and is formed so as to extend toward the rear of the lens barrel 2, that is, toward the main body side of the camera 1. The opening-side driven projection 27eb is in contact with the opening-side pressing portion 27dc at the middle part of the outer edge of the first barrier blade 27d when the first barrier blade 27d moves in the opening direction. By pressing this, the second barrier blade 27e is provided to rotate toward the open position.

  Next, the barrier closing spring 27f is an urging member provided to constantly urge the first barrier blade 27d in the closing direction. The barrier closing spring 27f is formed of a coil spring or the like, and has a shape in which arm portions at both ends thereof are extended to the outside.

  This barrier closing spring 27f is pivotally supported in a form in which it is wound around a spring shaft 16f projecting forward at the outer peripheral edge of the front end of the first group frame 16. One arm portion is locked to the outer wall of the boss portion 16h formed in the vicinity of the spring shaft 16f, and the other arm portion is locked to the driven pin 27da of the first barrier blade 27d. Thus, the first barrier blade 27d is always urged in the closing direction.

  The front side of the pair of barrier blades 27x including the first barrier blade 27d and the second barrier blade 27e, that is, the side opposite to the main body side of the camera 1 and the side closer to the subject in a state where the lens barrel 2 is assembled. The barrier drive ring 27c is rotatably arranged.

  In other words, the barrier drive ring 27c (barrier blade drive member) is disposed at a position opposite to the position where the first lens group 16a (optical element) is disposed with the pair of barrier blades 27x interposed therebetween. The pair of barrier blades 27x (27d, 27e) serve to open and close by rotating around the optical axis of the photographing optical system 2a.

  As described above, the barrier drive ring 27c serves as a mediating member for transmitting the driving force in the rotational direction of the first cam frame 15 to the first barrier blade 27d. The barrier drive ring 27c is made of an annular hard thin plate member, and a portion of the outer peripheral edge thereof facing each other is partially bent forward (to the subject side with respect to the camera 1). A pressing portion 27ca is formed. The pressed portion 27ca comes into contact with and is pressed by the pressing portion 15c when the first cam frame 15 rotates. Thereby, the driving force in the rotation direction of the first cam frame 15 is transmitted to the barrier drive ring 27c, and this is rotated in the same direction.

  That is, the pressing portion 15c of the first cam frame 15 and the pressed portion 27ca of the barrier drive ring 27c provide rotational force around the optical axis of the imaging optical system 2a of the first cam frame 15 (second frame member). It plays the role of the driving force transmission part 34 which transmits to the barrier driving ring 27c (barrier blade driving member).

  More specifically, the driving force transmitting portion 34 projects toward the inside of the first cam frame 15 (second frame member) at the tip end portion of the first cam frame 15 (second frame member). The pressing portion 15c is provided and a pressed portion 27ca provided at a position where the pressing portion 15c can come into contact with the pressing portion 15c on the outer peripheral side of the barrier driving ring 27c (barrier driving member).

  In this case, the first cam frame 15 (second frame member) is arranged outside the first group frame 16 (first frame member) as described above, and the driving force transmitting portion 34 (pressing portion). 15c and the pressed portion 27ca) are arranged on the opposite side to the side where the first lens group 16a (optical element) is arranged with the barrier blade 27x interposed therebetween.

  Further, a hole 27cf forming a barrier drive cam 27cb is formed in the vicinity of the pressed portion 27ca in the barrier drive ring 27c. The driven pin 27da of the first barrier blade 27d is inserted into the hole 27cf, and the driven pin 27da contacts a barrier drive cam 27cb formed on the outer edge of the hole 27cf. It comes to touch. As the barrier drive ring 27c rotates, the driven pin 27da moves relatively along the barrier drive cam 27cb. Thus, the first barrier blade 27d is rotated in the closing direction.

  On the other hand, the barrier drive ring 27c is formed with a pair of open spring accommodating portions 27cc each having a substantially rectangular shape so as to dispose the barrier open spring 27b. The arrangement positions of the pair of opening spring accommodating portions 27cc and the pair of pressed portions 27ca are arranged at predetermined positions shifted by approximately 90 degrees on the plane of the barrier drive ring 27c. .

  A ring-side spring hook portion 27cd formed in a standing bent shape is formed at each end portion in the long side direction of the pair of opening spring accommodating portions 27cc. One end of the barrier opening spring 27b is locked to the ring-side spring hook portion 27cd.

  Furthermore, a plurality of positioning protrusions 27ce are formed in a protruding shape outward at predetermined positions on the outer peripheral surface of the barrier drive ring 27c. Each of the positioning projections 27ce is in contact with the inner peripheral surface of the front end side of the first group frame 16, thereby serving to position the barrier drive ring 27c on the front end side of the first group frame 16. And this positioning protrusion part 27ce is rotating smoothly along this, hold | maintaining the state contact | abutted to the internal peripheral surface of the front end side of the 1st group frame 16. As shown in FIG.

  A barrier lid 27a is disposed on the front side of the barrier drive ring 27c (the side opposite to the main body side of the camera 1 and closer to the subject when the lens barrel 2 is assembled). Yes. The barrier lid 27a has a substantially annular shape, and serves to support the constituent members of the lens barrier 27 from the front side.

  A pair of lid-side spring hooks 27aa for locking the other end of the barrier opening spring 27b are projected from the inner peripheral edge of the barrier lid 27a toward the inner circumference at positions facing each other. Yes. In addition, a pair of screw holes 27ab are formed at positions facing each other on the plane of the barrier lid 27a. And corresponding to this, the said boss | hub part 16h provided with the screw hole 16k (refer FIG. 9) is formed in the front side of the front-end | tip part of the said 1 group frame 16. As shown in FIG. Accordingly, the barrier lid 27a is fastened and fixed to the screw hole 16k of the boss portion 16h on the front side of the first group frame 16 using the two screws 27g through the screw hole 27ab.

  An opening mask 29 that restricts an incident optical path to the photographing optical system is fixed to the front side of the barrier lid 27a with a double-sided tape or the like. Further, on the front side of the opening mask 29, a barrier decoration 28 serving as an exterior member that covers the outer surface side of the lens barrier 27 is fixed to the barrier lid 27a by means such as adhesion. That is, the opening mask 29 is sandwiched and mounted between the barrier lid 27a and the barrier decoration 28.

  The lens barrier opening / closing operation executed in accordance with the drawing operation and the drawing operation among the actions in the lens barrel 2 configured as described above will be described below.

  9 to 13 show the displacement of the lens barrier that operates as the lens barrel provided in the camera of the present embodiment is retracted from the photographing position (wide-angle position) toward the retracted position. It is a front view which shows the lens barrier of the front side of a lens-barrel. In addition, in order to avoid complication of drawing, illustration is abbreviate | omitted about the member which comprises the lens barrier 27, and structural members other than the member which acts on this.

  More specifically, FIG. 9 shows a state of the lens barrier 27 when the lens barrel 2 is set to the retracted position side slightly from the wide angle position, and the first and second barrier blades 27d and 27e of the lens barrier 27 are shown. Shows the state in the open position. At this time, the rotation angle of the barrier drive ring 27c is in an angle of 0 ° (degrees).

  FIG. 10 shows the state of the lens barrier 27 when the lens barrel 2 is slightly retracted from the position near the wide angle where the lens barrier 27 of FIG. 9 is the open position. At this time, the rotation angle of the barrier drive ring 27c Is a state rotated by an angle of 3 degrees (°) from the state of FIG.

  FIG. 11 shows the state of the lens barrier 27 when the lens barrel 2 is further retracted from the state of FIG. 10. At this time, the rotation angle of the barrier drive ring 27c is 5 degrees (° from the state of FIG. ) Only rotated.

  FIG. 12 shows the state of the lens barrier 27 when the lens barrel 2 is further retracted from the state of FIG. 11. At this time, the rotation angle of the barrier drive ring 27c is 8 degrees (° from the state of FIG. ) Only rotated.

  FIG. 13 shows the state of the lens barrier 27 when the lens barrel 2 is further retracted from the state of FIG. 12. At this time, the rotation angle of the barrier drive ring 27c is 10 degrees (° from the state of FIG. ) Only rotated.

  First, the operation when the lens barrier 27 is displaced to the closed position by performing the retraction operation from the state where the lens barrel 2 of the camera 1 is in the wide-angle position in the photographing position will be described.

  When the lens barrel 2 is extended to the wide-angle position in the photographing position, the barrier opening spring 27b biases the barrier drive ring 27c in the direction of arrow CW shown in FIG. 9 (clockwise in FIG. 9). Yes. When the lens barrel 2 is in the wide-angle position, the pressed portion 27ca of the barrier drive ring 27c and the pressing portion 15c of the first cam frame 15 are located at the positions indicated by the two-dot chain line in FIG. Is in a state.

  As described above, the lens barrel 2 can be displaced to any position by performing the feeding operation and the feeding operation in the region between the wide-angle position and the predetermined telephoto position. When the lens barrel 2 is displaced to an arbitrary shooting position in the region, the pressing portion 15c of the first cam frame 15 rotates in the direction of arrow CW shown in FIG. 9 (clockwise in FIG. 9). That is, when the pressing portion 15c of the first cam frame 15 is displaced between the imaging regions, the pressing portion 15c rotates within a predetermined range in the arrow CW direction in FIG. 9 with the position indicated by a two-dot chain line in FIG. 9 as one end. become.

  As described above, the barrier drive ring 27c is always applied with an urging force that rotates in the direction of arrow CW in FIG. 9 by the barrier opening spring 27b. The rotation of the barrier drive ring 27c in the same CW direction is locked by the rotation stopper portion 27cg provided at one end of the hole portion 27cf of the barrier drive ring 27c coming into contact with the barrier shaft 16g. Thus, the barrier drive ring 27c is restricted from rotating further in the CW direction from the state shown in FIG.

  As described above, in the present embodiment, the lens barrier 27 is opened when the lens barrel 2 is extended to a position slightly retracted from the wide-angle position (two-dot chain line) shown in FIG. It becomes. Then, when the lens barrel 2 is further extended to the wide-angle position that is the photographing position, the pressed portion 27ca of the barrier drive ring 27c and the pressing portion 15c of the first cam frame 15 are displaced to the position indicated by the two-dot chain line in FIG. To do. At this time, the rotation stopper portion 27cg of the barrier drive ring 27c contacts the barrier shaft 16g, the rotation of the barrier drive ring 27c in the CW direction is restricted, and the opening operation of the lens barrier 27 is completed. It should be noted that the lens barrier 27 is surely at the wide-angle position, which is the photographing position, between the position slightly retracted from the wide-angle position (two-dot chain line) shown in FIG. 9 and the wide-angle position shown by the two-dot chain line in FIG. This is an allowance for driving provided so as to be in the open position, and is for absorbing dimensional errors and assembly errors of various components.

  On the other hand, the urging force that urges the first barrier blade 27d in the closing direction by the barrier closing spring 27f always acts on the driven pin 27da of the first barrier blade 27d. That is, the barrier closing spring 27f acts on the driven pin 27da of the first barrier blade 27d, whereby the first barrier blade 27d rotates counterclockwise in FIG. 9 about the barrier shaft 16g. Is always given (to the first barrier blade 27d).

  However, when the barrier drive ring 27c is in the state shown in FIG. 9 (wide-angle position), the driven pin 27da of the first barrier blade 27d is located at a predetermined portion of the barrier drive cam 27cb (position near the rotation stopper portion 27cg). By the contact, the first barrier blade 27d is restricted from rotating in the direction of the arrow CCW in FIG. Therefore, in this state, the movement of the first barrier blade 27d to the closed position is restricted, and the open state of the first barrier blade 27d shown in FIG. 9 is maintained.

  Further, at this time, the outer side fringe portion (reference numeral 27de in FIG. 9) in the vicinity of the front end portion of the first barrier blade 27d is in contact with the blade stopper portion 16m formed on the inner peripheral edge portion on the front end side of the first group frame 16. Yes. As a result, the first barrier blade 27d does not further rotate in the CW direction in FIG. 9, and the open state of the first barrier blade 27d is maintained.

  At the same time, the opening-side pressing portion 27dc of the first barrier blade 27d abuts and is engaged with the opening-side driven protrusion 27eb of the second barrier blade 27e, so that the second barrier blade 27e moves to the closed position. And the open state of the first barrier blade 27d shown in FIG. 9 is maintained.

  In this way, when the lens barrel 2 is in any photographing position including the wide angle state, the open state of the barrier blade 27x is always maintained.

  When the lens barrel 2 is in the shooting position, for example, in the wide-angle position, a power-off operation is performed by a power operation member (not shown) that is linked to the power switch among the operation members provided in the camera 1. Then, the lens barrel 2 starts a predetermined retraction operation, and an operation for displacing the lens barrel 2 from the photographing position (wide-angle position) to the retracted position is executed.

  When this retraction operation is executed, first, a drive motor (not shown) is driven. The driving force of the drive motor rotates the rotary frame 12 and the second cam frame 14. As a result, the first group frame 16 and the third group frame 18 move backward. Along with this, the first cam frame 15 rotates in the direction of the arrow CCW shown in FIG. 9 (counterclockwise in FIG. 9). Then, the pressing part 15c (a part of the driving force transmission part 34) of the first cam frame 15 presses the pressed part 27ca (a part of the driving force transmission part 34) of the barrier drive ring 27c. As a result, the barrier drive ring 27c starts to rotate in the same direction (arrow CCW direction in FIG. 9) against the biasing force of the barrier opening spring 27b in the contraction direction. In this way, the present lens barrel 2 is retracted from the wide-angle position to the retracted position in FIG. 13 through the position near the wide-angle in FIG. Here, the state shown in FIG.

  In this state, as described above, the pressing portion 15c (a part of the driving force transmission portion) of the first cam frame 15 presses the pressed portion 27ca (a part of the driving force transmission portion) of the barrier drive ring 27c, The barrier drive ring 27c is rotated in the direction of the arrow CCW in FIG. 9 by a rotation angle of 3 degrees from the state shown in FIG.

  In the case of displacement from the state of FIG. 9 to the state of FIG. 10, when the barrier drive ring 27c starts to rotate in the direction of the arrow CCW as described above, the driven pin 27da of the first barrier blade 27d is barrier driven. It moves relatively along the cam 27cb.

  As described above, the first barrier blade 27d is urged in the closing direction by the closing spring 27f, and an urging force is always applied so as to rotate counterclockwise in FIG. 10 with the barrier shaft 16g as the rotation center. ing. However, the rotation of the first barrier blade 27d in the same direction (arrow CCW direction) is restricted by the driven pin 27da coming into contact with a predetermined position near the rotation stopper portion 27cg of the barrier driving cam 27cb.

  Here, as shown in FIG. 10, the barrier drive ring 27c rotates in the direction of the arrow CCW, and the driven pin 27da of the first barrier blade 27d relatively moves along the barrier drive cam 27cb. Accordingly, the first barrier blade 27d starts to rotate counterclockwise in FIG. 10 with the barrier shaft 16g as the rotation center. Accordingly, this causes the first barrier blade 27d to start moving toward the closed position.

  At this time, the closing-side pressing portion 27db of the first barrier blade 27d is not in contact with the closing-side driven protrusion 27ea of the second barrier blade 27e. That is, the two are not yet in contact with each other and are in positions separated from each other. Accordingly, the second barrier blade 27e is in a movable state within a predetermined range. Here, the movable range of the second barrier blade 27e is, for example, the position shown in FIG. 9 (open position) to the position shown in FIG. 10, that is, the opening side pressing portion 27dc of the first barrier blade 27d and the opening of the second barrier blade 27e. This is a range between the position where the side driven protrusion 27eb comes into contact.

  In the state shown in FIG. 10, the first cam frame 15 is further rotated in the direction of the arrow CCW, and the barrier drive ring 27c is rotated by 5 degrees from the state shown in FIG. 9 (2 degrees from the state shown in FIG. 10). If it rotates in the same direction, it will be in the state shown in FIG.

  In the state shown in FIG. 11, the first barrier blade 27d further rotates counterclockwise in FIG. 11 around the barrier shaft 16g from the state shown in FIG. 27 db is in contact with the closed driven protrusion 27 ea of the second barrier blade 27 e.

  When the first cam frame 15 is further rotated in the direction of the arrow CCW from the state of FIG. 11 and the barrier drive ring 27c is rotated in the same direction, the first barrier blade 27d is further moved to the barrier shaft 16g. It rotates counterclockwise in FIG. 11 as the center of rotation. Thereby, the closing side pressing portion 27db of the first barrier blade 27d presses the closing side driven protrusion 27ea of the second barrier blade 27e. In response to this, the second barrier blade 27e starts to rotate toward the closed position with the barrier shaft 16g as the rotation center. Then, the state shown in FIG. 12, that is, the first barrier blade 27d is completely moved to the closed position.

  That is, when the first barrier blade 27d and the second barrier blade 27e continue to rotate to the closed position with the barrier shaft 16g as the rotation center from the state of FIG. 11, a pair of first barrier blades as shown in FIG. As for 27d, the inner edge parts which mutually oppose contact | abut. As a result, the first barrier blade 27d is in the fully closed position. At this time, the second barrier blade 27e is disposed at a position in contact with the outer edge of the first barrier blade 27d, and this is also in the fully closed position. At this time, the barrier drive ring 27c is rotated in the same direction from the state shown in FIG. 9 by a rotation angle of 8 degrees (a rotation angle of 3 degrees from the state of FIG. 11) to be in the state shown in FIG.

  From the state of FIG. 12, the first cam frame 15 is further rotated in the direction of the arrow CCW of FIG. 13, and the lens barrel 2 is set to the retracted position. Along with this, the barrier drive ring 27c also rotates in the same direction. At this time, the barrier drive ring 27c is rotated in the same direction from the state shown in FIG. 9 by a rotation angle of 10 degrees (2 degrees from the state of FIG. 12) to be in the state shown in FIG.

  Then, the driven pin 27da and the barrier driving cam 27cb are separated from each other. Even in this state, the urging force of the closing spring 27f is applied to the driven pin 27da of the first barrier blade 27d so as to rotate it counterclockwise about the barrier shaft 16g. Therefore, the closed position of the barrier blade 27x composed of the first barrier blade 27d and the second barrier blade 27e is reliably maintained.

  Thus, in the region where the state of FIG. 12 is displaced from the state of FIG. 13, the barrier blade 27x secures the closed position by the urging force of the closing spring 27f. This region is referred to as an overcharge region.

  Next, an operation when the lens barrier 27 is displaced to the open position by performing the feeding operation from the state in which the lens barrel 2 is in the retracted position (state in FIG. 13) will be described.

  In the state of FIG. 13, the lens barrel 2 is in the retracted position as described above, and at this time, the barrier blade 27x is secured at the closed position by the urging force of the closing spring 27f (overcharge state). In this state, when a power-on operation is performed by a power operation member (not shown) linked to the power switch among the operation members provided in the camera 1, the lens barrel 2 starts a predetermined extending operation. Then, an operation of displacing the lens barrel 2 from the retracted position to the photographing position (wide angle position) is executed.

  When this extending operation is executed, first, a drive motor (not shown) is driven, and the rotary frame 12 and the second cam frame 14 rotate. Accordingly, the first group frame 16 and the third group frame 18 move forward, and accordingly, the first cam frame 15 rotates in the arrow CW direction shown in FIG. 13 (clockwise in FIG. 13). Then, the pressing part 15c (a part of the driving force transmission part 34) of the first cam frame 15 rotates in a direction away from the pressed part 27ca (a part of the driving force transmission part 34) of the barrier drive ring 27c. . Here, the barrier drive ring 27c is urged by the barrier opening spring 27b to rotate in the direction of the arrow CW as described above, that is, in the direction of opening the barrier blade 27x. Therefore, the barrier drive ring 27c starts to rotate in the same direction (arrow CW direction in FIG. 13) by the biasing force of the barrier opening spring 27b. Thus, the lens barrel 2 is extended from the retracted position in FIG. 13 toward the wide-angle position in FIG.

  In this case, the barrier drive ring 27c rotates from the retracted position in FIG. 13 in the direction of arrow CW in FIG. 13, and when the state shown in FIG. 12 is reached, the driven pin 27da and the barrier drive cam 27cb are in contact with each other. . In this state, the barrier blade 27x composed of the first barrier blade 27d and the second barrier blade 27e is still maintained in the closed position.

  From the state of FIG. 12, the first cam frame 15 further rotates in the direction of arrow CW, and accordingly, the barrier drive ring 27c also rotates in the same direction. Then, the driven pin 27da moves relatively along the barrier driving cam 27cb against the urging force of the closing spring 27f. Thus, the first barrier blade 27d rotates clockwise in FIG. 12 with the barrier shaft 16g as the center of rotation. Then, the contact state between the closing-side pressing portion 27db of the first barrier blade 27d and the closing-side driven protrusion 27ea of the second barrier blade 27e is released, and only the first barrier blade 27d moves in the opening direction. On the other hand, the second barrier blade 27e is left in the closed position. At this time, the second barrier blade 27e is movable within a predetermined range. Here, the movable range of the second barrier blade 27e is such that the closing-side pressing portion 27db of the first barrier blade 27d and the closed-side driven projection 27ea of the second barrier blade 27e from the position (closed position) shown in FIG. It is the range between the contact position.

  Then, the opening-side pressing portion 27dc of the first barrier blade 27d that rotates in the clockwise direction in FIG. 12 with the barrier shaft 16g as the center of rotation eventually eventually opens the second-side barrier blade 27e at the position shown in FIG. Abuts against the protrusion 27eb.

  From this state, when the first cam frame 15 is further rotated in the direction of the arrow CW and the barrier drive ring 27c is rotated in the same direction, the first barrier blade 27d is further illustrated with the barrier shaft 16g as the center of rotation. 12 in the clockwise direction. Accordingly, the opening-side pressing portion 27dc of the first barrier blade 27d continues to rotate in the same direction while pressing the opening-side driven protrusion 27eb of the second barrier blade 27e. Accordingly, the second barrier blade 27e rotates together with the first barrier blade 27d toward the closed position with the barrier shaft 16g as the rotation center. And it will be in the state of FIG. Here, the first barrier blade 27d and the second barrier blade 27e are disposed at an open position where the first barrier blade 27d and the second barrier blade 27e are retracted from the optical path of the photographing optical system.

  Further, when the barrier drive ring 27c rotates in the direction of the arrow CW, the rotation stopper portion 27cg of the hole portion 27cf of the barrier drive ring 27c contacts the barrier shaft 16g. As a result, the rotation of the barrier drive ring 27c stops, and the lens barrel 2 is set to the photographing position (wide angle position). During this time, the open position of the barrier blade 27x is maintained, and thereafter the open position of the barrier blade 27x is continuously maintained in a state where the lens barrel 2 is in the photographing position.

  As described above, according to the above-described embodiment, the component 1 constituting the lens barrel 2 of the camera 1 is a part of the feeding stage unit positioned at the tip when it is in the most extended state. A driving force for opening and closing the barrier blades 27x constituting the lens barrier 27 is obtained by using the rotational force of the first cam frame 15 which is a cylindrical member rotatably disposed on the outer peripheral side of the group frame 16. It is configured as follows.

  A barrier driving ring 27c, which is a driving member for driving the barrier blade 27x, is disposed at a predetermined position on the opposite side of the first lens group 16a among the plurality of optical elements with the barrier blade 27x interposed therebetween. Yes.

  Therefore, according to this, since the disposition position of the barrier blade 27x can be disposed close to the first lens group 16a (optical element), the enlargement of the lens barrel 2 can be suppressed and the lens mirror can be disposed. This can contribute to shortening the overall length of the cylinder 2 in the extended state. Moreover, since the increase in diameter of the opening on the front surface side of the lens barrel 2 can be suppressed, it is possible to contribute to the downsizing of the barrier blade 27x for covering the opening. Since the barrier blade 27x can be downsized, the lens barrel 2 itself can be reduced in size.

  Further, a driving force for opening and closing the barrier blade 27x from the first cam frame 15 (second frame member) that moves forward and backward integrally with the first group frame 16 (first frame member) and relatively rotates is provided. As a result, the driving force transmitting portion 34 including the pressing portion 15c of the first cam frame 15 (second frame member) and the pressed portion 27ca of the barrier driving ring 27c (barrier driving member), and the barrier blade 27x No movement space in the optical axis direction. Therefore, the lens barrel 2 can be reduced in size and the configuration of the lens barrier 27 can be simplified.

  Since the first cam frame 15 (second frame member) is arranged outside the first group frame 16 (first frame member), the barrier drive ring 27c and the first lens group 16a (optical element) are arranged. Even if the barrier blades 27x are arranged in the space between the two, the driving force can be easily transmitted.

  Further, since it is not necessary to adopt a configuration in which the driving force transmitting portion 34 for driving the barrier driving ring 27c is inserted through the inside of the lens barrel 2, the light shielding rubber (21, 23, 25) is provided between the cylindrical members. In addition, a dustproof and waterproof structure can be easily realized with a simple configuration in which only the waterproof rubber 26 and the like are provided.

1 is an external perspective view schematically showing a camera according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of a part of the constituent members of the lens barrel (peripheral portions of a fixed frame and a rotating frame) provided in the camera of FIG. 1. FIG. 3 is an exploded perspective view of a part of the lens barrel components (the peripheral part of the moving frame and the second cam frame) provided in the camera of FIG. 1. FIG. 2 is an exploded perspective view of a part of the lens barrel components (the first cam frame and the periphery of the first group frame) provided in the camera of FIG. 1. FIG. 2 is an exploded perspective view of a part of the constituent members of the lens barrel provided in the camera of FIG. 1 (the shutter unit, the float key, and the periphery of the third group frame). Sectional drawing which shows the state which has the lens-barrel with which the camera of FIG. 1 is equipped in a retracted position. Sectional drawing which shows the state which has the lens-barrel with which the camera of FIG. 1 is equipped exists in a wide angle position. Sectional drawing which shows the state which has the lens-barrel with which the camera of FIG. 1 is equipped in a telephoto position. FIG. 2 is a front view showing a lens barrier as viewed from the front side of the lens barrel provided in the camera of FIG. 1, and shows a state where the lens barrel is set near the wide-angle position and the lens barrier is in the open position (barrier The rotation angle of the drive ring is 0 degree). It is a front view which shows the lens barrier seen from the front side of the lens barrel with which the camera of FIG. 1 is equipped, Comprising: The figure which shows the state of a lens barrier when a lens barrel is retracted a little from the position of FIG. (The rotation angle of the barrier drive ring is 3 degrees). It is a front view which shows the lens barrier seen from the front side of the lens barrel with which the camera of FIG. 1 is equipped, Comprising: The state of a lens barrier when a lens barrel is further retracted from the state of FIG. 10 is shown. Fig. (The rotation angle of the barrier drive ring is 5 degrees). It is a front view which shows the lens barrier seen from the front side of the lens barrel with which the camera of FIG. 1 is equipped, Comprising: The state of a lens barrier when a lens barrel is further retracted from the state of FIG. 11 is shown. Fig. (The rotation angle of the barrier drive ring is 8 degrees). FIG. 2 is a front view showing a lens barrier viewed from the front side of the lens barrel provided in the camera of FIG. 1, and shows a state in which the lens barrel is set in a retracted position and the lens barrier is in a closed position (barrier driving); The rotation angle of the ring is 10 degrees).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Camera 2 ... Lens barrel 11 ... Fixed frame 12 ... Rotating frame 13 ... Moving frame 14 ... 2nd cam frame 15 ... 1st cam frame 15c ... Pressing part 16 ... 1 group frame 16a... First lens group 16g... Barrier shaft 17... 2 group frame 17a... 2nd lens group 18... 3 group frame 18a ... 3rd lens group 19. 23, 25 ... Light shielding rubber 22, 24 ... Decoration ring 26 ... Waterproof rubber 27 ... Lens barrier 27a ... Barrier lid 27aa ... Cover-side spring hook 27ab ... Screw hole 27b ... Barrier opening spring 27c ... ... Barrier drive ring 27ca ... Pressed part 27cb ... Barrier drive cam 27cc ... Opening spring accommodating part 27cd ... Ring-side spring hook part 27ce ... Positioning projection part 27cf ... Hole 27cg ... Rotation stopper part 2 d …… first barrier blade 27da …… driven pin 27db …… closed side pressing portion 27dc …… opening side pressing portion 27dd, 27ee …… shaft hole 27e …… second barrier blade 27ea …… closed side driven protrusion 27eb …… Open side driven projection 27f …… Closed spring 27g …… screw 27x …… barrier blade 28 …… barrier decoration 29 …… opening mask 30 …… light shielding bellows 31 …… biasing member 32 …… flare aperture 33 …… Fastening member 34 …… Drive force transmission part Attorney Susumu Ito

Claims (4)

In the lens barrel that performs the feeding operation and the feeding operation between the retracted position and the photographing position,
A feeding stage unit located at the tip when it is in the most extended state;
A first frame member which is included in the feeding stage unit and moves forward and backward in a direction along the optical axis of the photographing optical system without rotating in accordance with the feeding operation and the feeding operation;
Along with the feeding operation and the feeding operation included in the feeding stage unit, the first frame member integrally moves forward and backward in the direction along the optical axis of the photographing optical system, and with respect to the first frame member A second frame member that rotates relatively around the optical axis of the photographing optical system;
At least a pair of barrier blades disposed between the closed position disposed on the first frame member and blocking an optical path of the photographing optical system and an open position retracted from the optical path of the photographing optical system;
A barrier blade driving member disposed on the first frame member and rotated around the optical axis of the photographing optical system to open and close the barrier blade;
A driving force transmission unit that transmits the rotational force of the second frame member around the optical axis of the photographing optical system to the barrier blade driving member;
Was immediately Bei,
The pair of barrier blades are pivotally supported by a pair of shaft members projecting forward in the direction along the optical axis of the photographing optical system in the vicinity of the distal end portion of the first frame member. a lens barrel, characterized in that there.   The lens barrel according to claim 1, wherein the second frame member is disposed outside the first frame member.   A water-proof member is provided between the first frame member and the second frame member, and maintains a watertight space between the first frame member and the second frame member. The lens barrel according to claim 2. A camera comprising the lens barrel according to any one of claims 1 to 3.

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