JP4541907B2 - Zoom finder device and camera - Google Patents

Description

  The present invention relates to a zoom finder device that varies the magnification of a finder optical system in conjunction with rotation of a drive ring for driving a zoom lens barrel, and a camera incorporating the same.

  2. Description of the Related Art Conventionally, some cameras having a zoom lens are provided with a zoom finder device that varies the magnification of a finder optical system in conjunction with the zooming operation of the zoom lens (see, for example, Patent Document 1).

  This zoom finder device will be described with reference to FIGS. 25 and 26. FIG. FIG. 25 is a sectional view showing a driving mechanism of a conventional zoom finder device, and FIG. 26 is a development view of the cam ring of FIG.

  As shown in FIG. 25, the camera has a drive gear 101 to which rotation of a zoom motor (not shown) for performing zooming operation of the zoom lens is transmitted via a gear system. The drive gear 101 meshes with an inner peripheral gear 201 a formed on the drive ring 201, and the drive ring 201 is rotationally driven by the drive gear 101. An outer peripheral gear 201b is formed on the outer peripheral surface of the drive ring 201, and the outer peripheral gear 201b meshes with a transmission gear 301 for transmitting a driving force to the zoom finder device. Then, the rotation of the transmission gear 301 is transmitted to the cam ring 302. That is, the driving force of the zoom operation is transmitted to the zoom finder device side.

As shown in FIG. 26, the cam ring 302 is provided with two objective lens cams 302a and 302b. Cam pins 401 and 402 projecting from objective lenses (not shown) are abutted against the cams 302a and 302b. Here, each objective lens is held by the finder base 501 so as to be movable in the optical axis direction. When the cam ring 302 is rotated, the objective lens is moved in the direction of the optical axis following the cam shape of the cams 302a and 302b, so that the viewfinder image can be zoomed. The cams 302a and 302b have slopes in regions corresponding to the WIDE end (wide-angle end) and the TELE end (telephoto end) (regions RWa, RWb, RTa, and RTb surrounded by circles in the drawing). Since it is formed so that there is no region, it is possible to stably obtain a desired zoom position without being affected by play such as gear backlash.
JP 2004-145044 A

  However, in the cams 302a and 302b, there is an inflection point on the cam trajectory that shifts from the variable magnification region where the gradient changes to the region that does not have the gradient at the WIDE end or the TELE end. There is a problem that image fluctuation occurs when passing through the inflection point.

  Further, in order to prevent the occurrence of this image fluctuation, a separate part is required for giving the objective lens a biasing force in the direction opposite to the direction of rotation when the objective lens passes the inflection point. .

  SUMMARY OF THE INVENTION An object of the present invention is to provide a zoom finder device and a camera that can prevent the occurrence of image shake without providing a separate part for preventing the occurrence of image shake.

In order to achieve the above object, the present invention provides a zoom finder device that varies the magnification of a finder optical system in conjunction with rotation of a drive ring for driving a zoom lens barrel, and is provided on an outer surface of the drive ring. an interlocking member that is driven by a cam that is, the first engagement portion and the embedded position, collapsed position, the first with a used area in this order, Ru and second cam grooves is driven by the interlocking member is provided and cams plate, first provided is a second engagement portion, and a finder base comprising a second lens, the first, first, second cam pins respectively engaging the second cam groove butt A spring for urging the first and second lenses provided, the first and second springs for urging the cam plate in the direction of the assembly position , and provided on the outer surface of the drive ring The cams are the wide-angle end and the telephoto end of the zoom lens barrel. Of the region corresponding to each are formed such that the interlocking not member drives the dead zone without conjunction with the rotation of the drive ring, the first engaging portion rides over the second engaging portion As a result, the cam plate is prevented from falling off by receiving the urging force in the assembly position direction by the first and second springs by the engagement between the first engagement portion and the second engagement portion. A zoom finder device is provided.

  In order to achieve the above object, the present invention provides a camera in which the zoom finder device is incorporated.

  According to the present invention, it is possible to prevent the occurrence of image shake in advance without providing a separate part for preventing the occurrence of image shake.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a longitudinal sectional view of a lens barrel of a camera in which a zoom finder device according to a first embodiment of the present invention is incorporated, and FIG. 2 is an exploded perspective view of the lens barrel of FIG.

  As shown in FIGS. 1 and 2, the lens barrel includes a first group barrel 11, a second group barrel 12, a third group barrel 13, a low-pass filter 4, a CCD 5, and a CCD rubber 6. . Each of the first group barrel 11 and the second group barrel 12 holds a first group lens 1 and a second group lens 2 (see FIG. 1) having a zooming action (that is, constituting a zoom lens). Each of the lens barrel 11 and the group 2 lens barrel 12 is movable in the optical axis direction. The third group barrel 13 holds a third group lens 3 (see FIG. 1) that performs focus adjustment and image plane correction (that is, configures a focus lens), and the third group barrel 13 moves in the optical axis direction. Is possible.

  The first group barrel 11 and the second group barrel 12 are held by the movable cam ring 21. Cam grooves 21c and 21d are formed on the inner surface of the movable cam ring 21 to hold the first group barrel 11 and the second group barrel 12, respectively. The moving cam ring 21 is held by a fixed cylinder 22 so as to be movable.

  Three cam grooves 22 a are formed on the inner surface of the fixed cylinder 22, and three guide grooves 22 b that penetrate in the thickness direction are formed on the outer surface of the fixed cylinder 22. The fixed cylinder 22 is fixed to the CCD holder 23. The CCD holder 23 holds the low-pass filter 4 and the CCD 5. The CCD rubber 6 seals a gap formed between the CCD holder 23 and the CCD 5 in order to prevent dust and the like from adhering to the imaging surface of the CCD 5.

  The moving cam ring 21 is rotationally driven by a drive ring 24. The first group barrel 11 and the second group barrel 12 are moved in the optical axis direction while their rotations are restricted by the linear guide ring 25. The third group barrel 13 is driven by a focus motor 26, and the focus motor 26 is fixed to a third group cap 27. The third group cap 27 is fixed to the CCD holder 23. A cover cylinder 28 is fixed to the CCD holder 23. The cover cylinder 28 is a member for restricting the movement of the drive ring 24 in the optical axis direction, and a finder base described later is fixed to the cover cylinder 28.

  The drive ring 24 is formed with an outer peripheral gear 24a that meshes with a gear system (not shown) that transmits a drive force of a zoom motor (not shown). The drive ring 24 is connected to the zoom motor via the gear system. It is rotationally driven by the driving force transmitted to the outer peripheral gear 24a. The front end portion of the drive ring 24 abuts on a flange portion 28 a provided on the cover cylinder 28, and the rear end portion abuts on a flange portion 22 c provided on the rear end portion of the fixed cylinder 22. This restricts the movement of the drive ring 24 in the optical axis direction. On the inner surface of the drive ring 24, three rectilinear guide grooves 24b having a constant width extending in the optical axis direction are provided.

  On the outer surface of the movable cam ring 21, three follower pins 21 a that respectively fit with the three cam grooves 22 a of the fixed cylinder 22 are provided, and each follower pin 21 a corresponds to the corresponding cam groove 22 a according to the rotation of the movable cam ring 21. Will move along. A drive pin 21 b is provided at a substantially rear position of the follower pin 21 a on the outer periphery of the moving cam ring 21, and the drive pin 21 b passes through the three guide grooves 22 b of the fixed cylinder 22 and is a straight guide groove of the drive ring 24. 24b is slidably fitted. When the drive ring 24 is rotated, the rotation is transmitted to the movable cam ring 21 via the drive pin 21b fitted in the straight guide groove 24b, and the movable cam ring 21 is connected to the cam groove 22a of the fixed cylinder 22. It moves in the direction of the optical axis while rotating along the axis.

  A protrusion 25 a is provided at a front position on the outer surface of the rectilinear guide ring 25, and the protrusion 25 a is fitted in a cam groove 21 c provided on the inner periphery of the movable cam ring 21. Further, a flange portion 25 b is provided at the rear end portion of the linear guide ring 25, and the flange portion 25 b comes into contact with the rear end portion of the movable cam ring 21. As a result, the relative movement of the rectilinear guide ring 25 in the optical axis direction with respect to the moving cam ring 21 is restricted. Further, a protrusion 25c is provided at a rear position of the outer surface of the rectilinear guide ring 25, and the protrusion 25c is fitted to a rectilinear guide (not shown) provided on the inner surface of the fixed cylinder 22 so as to be able to advance straight. To do. Thereby, the rotation of the rectilinear guide tube 25 around the optical axis is restricted. Therefore, when the movable cam ring 21 rotates and moves along the cam groove 22a of the fixed cylinder 22, the rectilinear guide ring 25 moves only in the optical axis direction following the movement of the movable cam ring 21 in the optical axis direction.

  On the outer surface of the rectilinear guide ring 25, rectilinear guide grooves 25d and 25e having a constant width extending in parallel with the optical axis are provided, and guides provided integrally with the first group lens barrel 11 are provided in the rectilinear guide grooves 25d. The follower of the second group barrel 12 is slidably fitted into the straight guide groove 25e of the portion 11a. As a result, the rotation of the respective group barrels 11 and 12 is restricted. Therefore, when the movable cam ring 21 moves, the group barrels 11 and 12 move in the direction of the optical axis without rotating, and the desired focal length is obtained. It is possible to position the lens accordingly. The followers of the group barrels 11 and 12 are fitted in the cam grooves 21c and 21d of the movable cam ring 21, respectively. Here, the follower of the first group barrel 11 fitted in the cam groove 21c is composed of three follower pins 11b provided in the first group barrel 11, and the follower of the second group barrel 12 fitted in the cam groove 21d. Consists of two followers 12a provided integrally with the second group barrel 12 and a movable follower 12b biased toward the cam groove 21d by a spring.

  The first lens barrel 11 is provided with a known lens barrier mechanism 11c, and the lens barrier mechanism 11c blocks the optical path of the photographing optical system in the retracted state by a cam member 23a provided in the CCD holder 23. A known diaphragm shutter unit 15 is fixed to the second group barrel 12, and the shutter unit 15 moves integrally with the second group barrel 12 in the optical axis direction.

  Next, the shape of the cam grooves 21c and 21d of the moving cam ring 21 will be described with reference to FIG. FIG. 3 is an expanded view of the inner surface of the moving cam ring of FIG.

  As shown in FIG. 3, the cam groove 21c for the first group barrel 11 and the cam groove 21d for the second group barrel 12 in the moving cam ring 21 have gradients in the regions corresponding to the WIDE end and the TELE end, respectively. It is formed to be a region that does not have. Therefore, at each of the WIDE end and the TELE end, the group barrels 11 and 12 are positioned so as to always obtain a desired focal length stably without being affected by the play of the lens barrel.

  Next, driving of the third group lens (focus lens) 3 will be described.

  As described above, the third group lens 3 is held by the third group lens barrel 13, and the third group lens barrel 13 is slidable on a main guide bar 29 (see FIG. 2) placed parallel to the optical axis. Is held in. One end of the main guide bar 29 is fixed to the CCD holder 23, and the other end is positioned by the third group cap 27. A sub guide bar 23 b is provided in the CCD holder 23 with respect to the main guide bar 29, and the sub guide bar 23 b is disposed at a position substantially opposite to the main guide bar 29 across the optical axis. A detent (not shown) of the third group barrel 13 is slidably fitted to the sub guide bar 23b. Further, a nut receiving portion 13 a having a U-shaped cross section is provided in the vicinity of the main guide bar 29 of the third group barrel 13. A nut 14 that is screwed into the feed screw portion 26a of the focus motor 26 is placed in the U-shaped gap of the nut receiving portion 13a, and the rotation of the nut 14 is restricted by a detent 13b (see FIG. 1). The When the focus motor 26 is driven, the nut 14 that is prevented from rotating is fed in the feed screw direction.

  In the camera of the present embodiment, a zoom finder device is incorporated that varies the magnification of the finder optical system in conjunction with the zoom operation of the first group lens 1 and the second group lens 2. This zoom finder device will be described with reference to FIGS. 4 is a horizontal sectional view obtained along the optical axis of the zoom finder device, FIG. 5 is a bottom view of the zoom finder device, FIG. 6 is a top view of the cam plate, and FIG. 7 is a bottom view of the cam plate.

  As shown in FIG. 4 or FIG. 5, the zoom finder device includes a finder base 30, a plurality of objective G1 to G4 lenses 31 to 34, a prism 36, a roof prism 38, and an eyepiece lens 39. The objective G1 lens 31 is fixed to the finder base 30. Light from the subject side enters the objective G1 lens 31, and the incident light enters the prism 36 while being repeatedly refracted between the objective G2 to G4 lenses 32-34. In the prism 36, the incident light is reflected by the reflecting surface, and the reflected light forms an image once on the surface 37 with the field frame. The imaged light is repeatedly reflected by the roof prism 38 and then enters the eye of the photographer through the eyepiece 39.

  The objective G2 lens 32, the objective G3 lens 33, and the objective G4 lens 34 are along two guide bars 35a and 35b and a guide groove (not shown) provided in the finder base 30 that serves as a rotation stopper. It is configured to be movable in the optical axis direction. An objective G2 lens 32 is pivotally supported on the guide bar 35a. A compression spring 40a is inserted into the guide bar 35a, and the compression spring 40a is disposed so as to be sandwiched between the objective G2 lens 32 and the abutting portion of the finder base 30. The compression spring 40a applies a load toward the objective side with respect to the objective G2 lens 32, and biases the objective G2 lens. The cam pin 32a protruding from the objective G2 lens 32 is abutted against the objective side surface of the cam groove 41a provided in the cam plate 41 shown in FIG. Thereby, the objective G2 lens 32 moves in the optical axis direction following the cam shape defined by the cam groove 41a as the cam plate 41 moves.

  An objective G3 lens 33 and an objective G4 lens 34 are pivotally supported on the guide bar 35b. A compression spring 40b is inserted into the guide bar 35b, and the compression spring 40b is disposed so as to be sandwiched between the two objectives G3 and G4 lenses 33 and 34. By this compression spring 40b, the objective G3 lens 33 is shifted to the objective side, and the objective G4 lens 34 is shifted to the eyepiece side. A cam pin 33a that protrudes from the objective G3 lens 33 due to a biased load of the compression spring 40b protrudes from the objective G4 lens 34 on the objective side surface of the cam groove 41b provided in the cam plate shown in FIG. 34a is abutted against the eyepiece side surface of the cam groove 41c. Thereby, with the movement of the cam plate 41, the objective G3 lens 33 and the objective lens G4 lens 34 move in the optical axis direction following the cam shapes defined by the cam grooves 41b and 41c, respectively.

  As shown in FIG. 6, two rectilinear guide grooves 41 d and 41 e extending in the longitudinal direction are provided on the upper surface of the cam plate 41. Two guide pins 30a and 30b projecting from the bottom surface of the finder base 30 are slidably fitted into the straight guide grooves 41d and 41e, respectively, so that the cam plate 41 moves in the optical axis direction. Movement is restricted, and movement in the left-right direction perpendicular to the optical axis of the cam plate 41 is made possible.

  As shown in FIG. 7, a plurality of engagement sliding portions 41 f, 41 g, 41 h are provided on the lower surface of the cam plate 41, and the respective engagement sliding portions 41 f, 41 g, 41 h are provided on the finder base 30. Engage with the engaging protrusions 30c, 30d, and 30e, respectively. This prevents the cam plate 41 from falling when the cam plate 41 moves in the left-right direction orthogonal to the optical axis.

  In the zoom finder device configured as described above, when the cam plate 41 is moved in the left-right direction orthogonal to the optical axis by a later-described interlocking member, the objective lenses 32 to 34 are inserted into the cam grooves 41a, 41b, 41c. Since it moves in the optical axis direction, the viewfinder image can be zoomed.

  A zoom strobe device is integrally incorporated in the zoom finder device. This zoom strobe device will be described with reference to FIGS. 8 is a perspective view of the zoom strobe device incorporated in the zoom finder device, FIG. 9 is a bottom view of the zoom strobe device of FIG. 8, and FIG. 10 is a top view showing a state in which the zoom strobe device is incorporated in the viewfinder base. FIG. 11 is a right side view of the zoom strobe device at the WIDE position. Here, in FIG. 11, the finder base 30 and the cam plate 41 are shown in a sectional view for easy understanding.

  As shown in FIG. 8, the zoom strobe device 50 includes a panel 51, a xenon tube 52, a reflective shade 53, a strobe holding member 54, a pressing rubber 55, and the like. The panel 51 has a function of condensing or diffusing light emitted from the light source, and is fixed to the finder base 30. The xenon tube 52 is connected to a power source via a lead wire (not shown), and is a light source for illuminating the subject. The reflection shade 53 is a reflection member for reflecting the light emitted from the xenon tube 52 and guiding it to the front of the camera. The holding rubber 55 is a member for pressing the xenon tube 52 against the reflective shade 53. The xenon tube 52, the reflective shade 53, and the pressing rubber 55 are incorporated in the strobe holding member 54.

  The zoom strobe device 50 is slidably held on a main guide bar 56 (see FIG. 10) that is pivotally supported by the finder base 30. As shown in FIG. 10, a sub guide bar 30f is provided at a position substantially opposite to the main guide bar 56 of the finder base 30, and a detent 54a of the strobe holding member 54 is provided on the sub guide bar 30f. Fits slidably. A compression spring 57 is sandwiched between the strobe holding member 54 and the abutting portion of the finder base 30 with the main guide bar 56 as an axis (see FIGS. 9 and 10). The compression spring 57 applies a load to the front of the camera with respect to the strobe holding member 54 and moves the strobe holding member 54 to one side. As shown in FIG. 11, the cam pin 54 b (see FIG. 9) protruding from the lower surface of the strobe holding member 54 passes through the through hole 30 g (see FIG. 5) of the finder base 30, as shown in FIG. 41 is abutted against the front side surface of the camera in a cam groove 41i (see FIG. 6) provided in 41.

  In the zoom strobe device 50 configured as described above, the strobe holding member 54 in which the xenon tube 52 and the reflective shade 53 are incorporated as the cam plate 41 moves, and the strobe optical axis follows the cam shape of the cam groove 41i. Move forward and backward. As the strobe holding member 54 advances and retreats, the distance between the xenon tube 52 and the reflection shade 53 and the panel 51 changes, so that the irradiation angle of the strobe light changes. That is, the irradiation range of the strobe light changes in conjunction with the zoom operation (rotation of the drive ring 24) of the first group barrel 11 and the second group barrel.

  Next, a configuration when the zoom strobe device 50 is incorporated in the zoom finder device will be described with reference to FIGS. FIG. 12 is a bottom view of the zoom finder device. FIG. 12 shows a state before the cam plate 41 is assembled, although the objective lens has already been incorporated. FIG. 13 is a bottom view showing a state in which the cam plate is incorporated in the zoom finder device (state at the incorporation position), and FIG. 14 is a bottom view showing a state in which the cam plate 41 is incorporated to a position where it does not fall with respect to the finder base. FIG. 15 is a right side view at a position where the zoom strobe device is incorporated in the viewfinder base.

  As shown in FIG. 12, the objective G2 lens 32 and the objective G3 lens 33 are biased toward the objective side, and the objective G4 lens 34 is biased toward the eyepiece side by compression springs 40a and 40b (see FIG. 5). The G2 lens 32 is in contact with the object-side abutting surface of the finder base 30, the object G3 lens 33 is in contact with the protrusion 30h provided on the finder base 30, and the object G4 lens 34 is in contact with the eyepiece-side abutting surface of the finder base 30. And the bias is fixed. This mounting position corresponds to the mounting position (first position) A in the top view of the cam plate in FIG. As shown in FIG. 6, in the above-mentioned installation position, the widths of the cam grooves 41a to 41c of the objective G2 to G4 lenses 32 to 34 and the two rectilinear guide grooves 41d and 41e are larger than the diameters of the corresponding pins. Since it is formed, the cam plate 41 can be easily incorporated.

  As shown in FIG. 13, the cam pins 32a, 33a, 34a of the objective G2 to G4 lenses 32-34 and the guide pins 30a of the viewfinder base 30 are provided for the cam grooves 41a, 41b, 41c, 41d, 41e described above. In the state in which 30b is inserted, the engagement sliding portions 41f, 41g, 41h of the cam plate 41 do not overlap with the engagement protrusions 30c, 30d, 30e of the finder base 30, so that the cam plate 41 is It is in a state of falling. From this state, the cam plate 41 is moved in the direction of the arrow in the drawing, and the engagement claw 41j protruding from the cam plate 41 is assembled to a position where it passes over the engagement portion 30i of the finder base 30, as shown in FIG. As described above, the engaging sliding portions 41f, 41g, and 41h of the cam plate 41 are engaged with the respective engaging protrusions 30c, 30d, and 30e of the finder base 30 so that the cam plate 41 does not fall. Become. The state shown in FIG. 14 is a state in which the cam plate 41 is in the WIDE position.

  Here, when the cam plate 41 is incorporated in the finder base 30 and the cam pins 32a, 33a, 34a of the objective G2 to G4 lenses 32 to 34 are engaged with the corresponding cam grooves 41a, 41b, 41c, the objective G2 lens 32 is obtained. Is biased toward the objective side, the objective G3 lens 33 is biased toward the objective side, and the objective G4 lens 34 is biased toward the eyepiece side, so that the biasing force F32, F33, F34 is applied to the cam plate 41 as shown in FIG. Will work. Then, due to the relationship between the direction of the force with which the cam pins 32a, 33a, 34a push the cam grooves 41a, 41b, 41c and the gradient of the cam grooves 41a, 41b, 41c, the component forces f32, f33, f34 work, and the cam plate 41 Is always urged to the right in FIG. As a result, the cam plate 41 is urged and fixed at the position where the engaging claw 41j contacts the engaging portion 30i of the finder base 30 (collapsed position). At the retracted position, the engagement sliding portions 41f, 41g, 41h of the cam plate 41 overlap and engage with the respective engagement protrusions 30c, 30d, 30e of the finder base 30, so that the cam plate 41 falls. There is nothing. Here, the installation position (first position) of the cam plate 41 is a position outside the use area of the camera, and the position after the retracted position where the cam plate 41 is installed is the position of the use area of the camera. Become.

  As described above, according to the configuration of the present embodiment, the cam plate 41 can be easily incorporated into the finder base 30, and once the cam plate 41 is incorporated into the finder base 30, the cam plate 41 becomes the finder base 30. Since it is urged and fixed to 30, it does not come off the finder base 30 from the cam plate 41.

  Further, as shown in FIG. 15, the portion used in the cam groove 41i provided in the cam plate 41 is the front side surface, so that the rear side is largely escaped (see FIG. 6). . Also in the through hole 30g of the finder base 30, the back is largely escaped (see FIG. 4). As a result, as shown in FIG. 15, the strobe holding member 54 is located at a position further rearward than the TELE position, at a position where the detent 54 a of the strobe holding member 54 is not fitted with the sub guide bar 30 f of the finder base 30 (installation position). The cam pin 54b projecting from the lower surface can be inserted into the cam groove 41i through the through hole 30g. Therefore, when the zoom strobe device 50 (strobe holding member 54) is assembled from the upper surface side of the finder base 30 into the assembling position and the main guide bar 56 and the compression spring 57 are assembled into the finder base 30, the zoom strobe device 50 ( The strobe holding member 54) is urged forward so that the detent 54a and the sub guide bar 30f are fitted together, and the cam pin 54b is urged and fixed at a position where it abuts the cam groove 41i (see FIG. 11).

  As described above, according to the configuration of the present embodiment, it is not necessary to perform alignment with the cam plate 41 in order to incorporate the zoom strobe device 50 (strobe holding member 54), and the zoom strobe device 50 can be easily incorporated. become. Further, since the rear of the cam groove 41i is largely escaped, the relationship between the cam pin 54b and the cam groove 41i at the position where the zoom strobe device 50 is assembled is constant regardless of the position of the cam plate 41, and the cam plate 41 The zoom strobe device 50 can be incorporated at any position.

  Next, a transmission mechanism that transmits driving force from the lens barrel to the zoom finder device and the zoom strobe device will be described with reference to FIGS. 16 is an exploded perspective view showing a configuration of a transmission mechanism that transmits driving force from the lens barrel to the zoom finder device and the zoom strobe device, FIG. 17 is a perspective view showing details of the transmission mechanism in FIG. 16, and FIG. 18 is a lens mirror. FIG. 19 is an unfolded view of the outer surface of the drive ring. FIG.

  In the transmission mechanism for transmitting the driving force from the lens barrel to the zoom finder device and the zoom strobe device, an interlocking member 60 for transmitting the driving force from the drive ring 24 to the cam plate 41 is provided as shown in FIG. ing. The interlocking member 60 is formed with a locking portion 60a, a guide pin 60b extending obliquely below the interlocking member 60, and a cam pin 60c. The interlocking member 60 is slidably held by the guide bar 61, and the guide bar 61 is pivotally supported between the groove 23c of the CCD holder 23 and the hole 28b of the cover cylinder 28 (see FIG. 2). One end of the tension spring 62 is locked to the locking portion 60a of the interlocking member 60, the other end is locked to a hook 23d provided on the CCD holder 23 (see FIG. 2), and the tension spring 62 is interlocked. The member 60 is urged toward the rear side of the camera.

  The guide pin 60 b of the interlocking member 60 is slidably inserted into the guide groove 28 c formed in the cover cylinder 28 in the thickness direction, and the tip thereof is inserted into the cam groove 24 c formed on the outer surface of the drive ring 24. Mating. Accordingly, the rotation of the interlocking member 60 around the guide bar 61 is restricted, and the interlocking member 60 is driven in the optical axis direction following the cam groove 24c as the drive ring 24 rotates. Here, as shown in FIG. 19, the cam grooves 24c formed on the outer surface of the drive ring 24 are regions where the regions corresponding to the WIDE end and the TELE end have no cam gradient (the drive ring 24 is rotated). Is also formed in a dead zone where the interlocking member 60 is not moved. The finder base 30 on which the cam plate 41 is integrally held is fixed to the cover cylinder 28, and a cam pin 60 c provided on the upper surface of the interlocking member 60 is provided on the bottom surface of the cam plate 41 k. (See FIG. 7).

  As described above, the corresponding guide pins 30a and 30b of the finder base 30 are slidably fitted in the straight guide grooves 41d and 41e of the cam plate 41, respectively. Movement is restricted, and the cam plate 41 is movable in the left-right direction orthogonal to the optical axis. Therefore, when the interlocking member 60 moves in the optical axis direction as the drive ring 24 rotates, the cam plate 41 moves in the left-right direction perpendicular to the optical axis following the cam groove 41k. Here, as in the present embodiment, the transmission of the driving force from the interlocking member 60 to the cam plate 41 is not limited to the configuration in which the cam pin 60c and the cam groove 41k are engaged, For example, a mechanism that transmits a driving force using a gear and a rack may be used.

  As described above, in this embodiment, the lens barrel is converted into a linear motion in the left-right direction orthogonal to the optical axis of the cam plate 41 via the single interlocking member 60. The drive force is transmitted from the cylinder to the zoom finder and zoom strobe devices. This enables parts reduction and miniaturization, and high-precision cam plate position control by simplifying the transmission mechanism. Is possible.

  In addition, since the regions corresponding to the WIDE end and the TELE end of the cam groove 24c of the drive ring 24 are regions (dead zone) having no cam gradient, the dead zone region causes the drive ring 24 due to play of the lens barrel. Even if the drive ring 24 is rotated to a position exceeding the WIDE end or to a position exceeding the TELE end, the interlocking member 60 is moved to a position exceeding the WIDE end or a position exceeding the TELE end. There is nothing. Therefore, the cam plate 41 driven by the interlocking member 60 is not moved to a position beyond the WIDE end or to a position beyond the TELE end, and the zoom position of the desired zoom finder device and the zoom strobe are always stable. It is possible to obtain the irradiation angle (irradiation range) of the apparatus. Further, since the cam plate 41 is not moved to a position beyond the WIDE end or to a position beyond the TELE end, the cam groove 41a of the objective G2, G3, G4 lenses 32, 33, 34 provided on the cam plate 41. , 41b, and 41c are not provided with a region that does not have a gradient that is conventionally required (see FIG. 6). Therefore, since there is no inflection point when moving from the variable magnification region where the gradient of the cam groove for the objective lens that has existed in the past changes to the region without the gradient, the image fluctuation of the objective lens when passing through the inflection point Occurrence can be prevented in advance.

  As described above, according to the present embodiment, since it is not necessary to provide inflection points in the objective lens cam grooves 41a, 41b, and 41c, the objective lens can be stably operated, and further, the image is swayed. Therefore, a separate part for obtaining a biasing force for preventing the occurrence of this is not necessary, and the number of parts can be reduced.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 20 is a longitudinal sectional view in the retracted state of a lens barrel of a camera in which a zoom finder device according to a second embodiment of the present invention is incorporated, and FIG. 21 is a zoom according to the second embodiment of the present invention. FIG. 22 is an exploded perspective view of the lens barrel of FIG. 20, and FIG. 23 is a drive from the lens barrel to the zoom finder device and the zoom strobe device. FIG. 24 is an exploded perspective view showing the configuration of the transmission mechanism for transmitting force, and FIG.

  In the present embodiment, the configurations of the zoom finder device and the zoom strobe device are the same as those in the first embodiment, and a description thereof will be omitted. Moreover, in the figure, the same code | symbol is attached | subjected about the component same as the component of 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 20 to 22, the lens barrel includes a first group lens 81, a second group lens barrel 82, and a third group lens barrel 82, 3 that hold a first group lens 71, a second group lens 72, and a third group lens 73 having a zooming function. A group barrel 83, a fourth group barrel 84 that holds a fourth group lens 74 that performs focus adjustment and image plane correction, a low-pass filter 4, a CCD 5, and a CCD rubber 6 are provided. The first and second group barrels 81 and 82 are held by a movable cam ring 91 having a cam groove on the inner surface. The third group barrel 83 is fixed to the CCD holder 93.

  The moving cam ring 91 is movably held by the fixed cylinder 92. On the inner surface of the fixed cylinder 92, three cam grooves 92a and a straight guide groove 92b having a constant width extending in the optical axis direction are formed. The fixed cylinder 92 is fixed to the CCD holder 93, and the CCD holder 93 holds the low-pass filter 4 and the CCD 5. A focus motor 94 for driving the fourth group barrel 84 is fixed to the CCD holder 93.

  An outer peripheral gear 91a is formed on the outer periphery of the moving cam ring 91, and the outer peripheral gear 91a meshes with a gear system (not shown) that transmits the rotation of a zoom motor (not shown). Thereby, the movable cam ring 91 is rotationally driven by the zoom motor. Further, on the outer periphery of the movable cam ring 91, three follower pins 91 b that are fitted in the respective cam grooves 92 a of the fixed cylinder 92 are provided, and the movable cam ring 91 extends along the respective cam grooves 92 a of the fixed cylinder 92. Move in the direction of the optical axis while rotating. Two cam grooves 91c and 91d are formed on the inner surface of the movable cam ring 91, and follower pins provided in the first group barrel 81 and the second group barrel 82 are formed in the cam grooves 91c and 91d, respectively. 81c and 82b are fitted.

  A guide portion 81 a provided integrally with the first group barrel 81 is slidably fitted in the straight guide groove 92 b of the fixed barrel 92. In addition, a linear guide groove 81b having a constant width extending in the optical axis direction is formed on the outer surface of the first group barrel 81, and a guide integrally provided in the second group barrel 82 is formed in the straight guide groove 81b. The portion 82a is slidably fitted. Thereby, the rotation of each group barrel 81, 82 is restricted, and when the movable cam ring 91 is moved in the optical axis direction, each group barrel 81, 82 moves in the optical axis direction without rotating. Become. Therefore, it is possible to arrange lenses according to a desired focal length.

  The first lens barrel 81 is provided with a known lens barrier mechanism 81d. The lens barrier mechanism 81d blocks the optical path of the photographing optical system when the lens barrel is retracted by the cam member 83a provided in the third lens barrel 83. To be driven. Further, a known diaphragm shutter unit 85 is fixed to the third group barrel 83.

  Next, a transmission mechanism for transmitting driving force from the lens barrel to the zoom finder device and the zoom strobe device will be described with reference to FIGS. 23 and 24. FIG.

  In the present embodiment, the configuration related to the interlocking member 60 is the same as that of the first embodiment, and thus the description thereof is omitted. As shown in FIG. 23, the present embodiment is different from the first embodiment in that the cam groove 91e that fits with the guide pin 60b of the interlocking member 60 has a moving cam ring 91 that advances and retreats in the optical axis direction. It differs in that it is provided on the outer surface. Here, the cam groove 91e has a relative positional relationship with the interlocking member 60, and the interlocking member 60 and the cam groove 24c provided on the outer surface of the drive ring 24 that does not advance and retract in the optical axis direction in the first embodiment. The movable cam ring 91 is provided so as to be equal to the relative positional relationship between the two. Further, as shown in FIG. 24, the cam groove 91e is formed so that the regions corresponding to the WIDE end and the TELE end do not have a cam gradient like the cam groove 24c in the first embodiment. Yes. Therefore, as described in detail in the first embodiment, it is not necessary to form a region having no gradient in the cam groove for the objective lens provided in the cam plate 41.

  Thus, according to the present embodiment, as in the first embodiment, the rotational movement of the lens barrel is moved in the left-right direction perpendicular to the optical axis of the cam plate 41 via one interlocking member 60. By converting to linear motion, transmission of driving force from the lens barrel to the zoom finder device and the zoom strobe device is realized. Therefore, it is possible to reduce the number of parts and thereby reduce the size, and to control the position of the cam plate with high accuracy by simplifying the transmission mechanism. In addition, since it is not necessary to provide an inflection point in the cam groove of the objective lens, it is possible to operate the objective lens stably, and in addition, a separate force for obtaining a shifting force for preventing the occurrence of image shake is provided. Body parts are not necessary, and parts can be reduced.

1 is a longitudinal sectional view of a lens barrel of a camera in which a zoom finder device according to a first embodiment of the present invention is incorporated. It is a disassembled perspective view of the lens barrel of FIG. It is a figure which expand | deploys and shows the inner surface of the moving cam ring of FIG. It is the horizontal sectional view obtained along the optical axis of a zoom finder apparatus. It is a bottom view of a zoom finder device. It is a top view of a cam plate. It is a bottom view of a cam board. It is a perspective view of a zoom strobe device incorporated in a zoom finder device. FIG. 9 is a bottom view of the zoom strobe device of FIG. 8. It is a top view which shows the state in which the zoom strobe device was incorporated in the finder base. It is a right view of the zoom strobe device at the WIDE position. It is a bottom view of a zoom finder device. It is a bottom view which shows the state (state in an assembly position) in which the cam board was integrated in the zoom finder apparatus. It is a bottom view which shows the state in which the cam board 41 was integrated to the position which does not fall with respect to a finder base. It is a right view in the position where the zoom strobe device was incorporated in the finder base. It is a disassembled perspective view which shows the structure of the transmission mechanism which transmits a driving force from a lens barrel to a zoom finder device and a zoom strobe device. It is a perspective view which shows the detail of the transmission mechanism of FIG. It is a perspective view which shows the state in which the finder base was integrated in the lens barrel. It is a figure which expand | deploys and shows the outer surface of a drive ring. It is a longitudinal cross-sectional view in the retracted position of the lens barrel of the camera in which the finder apparatus according to the second embodiment of the present invention is incorporated. It is a longitudinal cross-sectional view in the wide-angle position of the lens barrel of the camera in which the finder apparatus which concerns on the 2nd Embodiment of this invention is incorporated. FIG. 21 is an exploded perspective view of the lens barrel of FIG. 20. It is a disassembled perspective view which shows the structure of the transmission mechanism which transmits a driving force from a lens barrel to a zoom finder device and a zoom strobe device. It is a figure which expand | deploys and shows the outer surface of the moving cam ring of FIG. It is sectional drawing which shows the drive mechanism of the conventional zoom finder apparatus. FIG. 26 is a development view of the cam ring of FIG. 25.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,71 1st group lens 2,72 2nd group lens 3,73 3rd group lens 11,81 1st group lens barrel 12,82 2nd group lens barrel 13,83 3rd group lens barrel 24 Drive ring 24c, 91e Cam groove 24c Guide groove 30 Finder base 30c, 30d, 30e Engaging protrusion 31 Objective G1 lens 32 Objective G2 lens 33 Objective G3 lens 34 Objective G4 lens 41 Cam plate 41f, 41g, 41h Engagement sliding part 50 Zoom strobe device 51 Panel 52 Xenon tube 53 Reflection shade 53
54 Strobe holding member 60 Interlocking member 60b Guide pin 74 4th group lens 84 4th group lens tube 91 Moving cam ring

Claims (6)

A zoom finder device that varies the magnification of a finder optical system in conjunction with rotation of a drive ring for driving a zoom lens barrel,
An interlocking member driven by a cam provided on the outer surface of the drive ring;
The first engagement portion and the embedded position, a retracted position, first, and second cam grooves is driven by the interlocking member provided Luke arm plate having a used area in this order,
A finder base provided with a second engagement portion and provided with first and second lenses;
A spring for urging the first and second lenses provided with first and second cam pins protrudingly engaged with the first and second cam grooves, respectively. And first and second springs for biasing ,
The cam provided on the outer surface of the drive ring is a dead zone where the regions corresponding to the wide-angle end and the telephoto end of the zoom lens barrel do not drive the interlocking member without interlocking with the rotation of the drive ring. When the first engagement portion climbs over the second engagement portion, the bias in the assembly position direction by the first and second springs is applied to the first engagement portion. A zoom finder device , wherein the cam plate is prevented from falling off by being received by engagement with a second engagement portion .   2. The zoom finder device according to claim 1, wherein the drive ring constitutes a part of the zoom lens barrel and is driven to rotate at least around the optical axis of the zoom lens barrel.   3. The zoom finder device according to claim 2, wherein the drive ring is rotationally driven around the optical axis of the zoom lens barrel without moving back and forth in the optical axis direction of the zoom lens barrel.   3. The zoom finder device according to claim 2, wherein the drive ring moves forward and backward in the optical axis direction of the zoom lens barrel while being driven to rotate around the optical axis of the zoom lens barrel.   The cam plate is provided with an objective lens cam for driving an objective lens included in the finder optical system, and the objective lens cam is a cam whose gradient always changes. The zoom finder device according to 1.   A camera incorporating the zoom finder device according to claim 1.

Images