JP2006243386A - Camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve workability in assembly and reliability in use in a camera for taking a photograph by catching subject light made incident via a photographic lens comprising a plurality of lens groups. <P>SOLUTION: The camera is equipped with: a front group lens frame 310 holding a front group lens 210; a rear group lens frame 320 holding a rear group lens 220 and also supporting a light quantity control member 410; and a front moving barrel 150 to which the rear group lens frame 320 is attached. The light quantity control member 410 is equipped with a projection part 413 pressed by the pressing part 151 of the front moving barrel 150 in shifting from an extending state to a collapsible state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a camera that captures and captures subject light that has entered through a photographing lens composed of a plurality of lens groups.

  Conventionally, in a camera, a photographic lens provided with a plurality of lens groups for constituting a zoom lens has been widely used. This is also the case with a conventional camera for taking a picture on a silver halide film. The same applies to a digital camera that forms an image on an element and generates image data (see Patent Document 1).

  In the camera of this Patent Document 1, the tube length is changed between a retracted state in which the lens barrel is completely or partially accommodated in the camera body and a protruding state protruding from the camera body for the convenience of carrying. It is equipped with a retractable lens barrel that can be extended.

  In such a retractable and retractable lens barrel, in order to make the tube length at the time of retracting as short as possible, when the transition from the extended state to the retracted state, the optical axis direction front member is the rear member in the optical axis direction. A technique for further shortening the cylinder length when retracted by pressing is known.

As one of them, a front group lens frame that holds a lens at the front end in the optical axis direction of a plurality of lens groups constituting the photographing lens, and a rear group lens that is adjacent to the back of the front group lens in the optical axis direction And a rear group lens frame that supports a light quantity control member comprising a shutter member or a diaphragm member on the front surface of the rear group lens so as to be movable in the optical axis direction and spring-biased forward in the optical axis direction. When shifting from the extended state to the retracted state, the tube length at the time of retracting is shortened by pressing the light amount control member with the front group lens frame and pushing the light amount control member back in the optical axis direction against the spring bias. Technology to make it known is known.
JP 2004-347615A

  However, the lens frame often employs a process in which the position of the lens frame is adjusted in the direction of the optical axis and in the direction perpendicular to the optical axis at the time of assembly and then bonded to the components constituting the lens barrel with an adhesive. In this case, when the adhesive is shifted to the retracted state before the adhesive is completely dried and completely bonded, the lens frame receives a reaction force from the light amount control member biased forward in the optical axis direction. There is a possibility that the position in the optical axis direction of the lens frame that has been bonded and position-adjusted is displaced. In addition, since it is fixed by bonding, if the bonding is somewhat weak, there is a risk that the bonding will be lost during use due to the reaction force received each time the lens barrel is retracted.

  In view of the circumstances described above, an object of the present invention is to provide a camera with improved workability during assembly and reliability during use.

The camera of the present invention that achieves the above object is a camera that captures and captures subject light that has entered through a photographing lens composed of a plurality of lens groups.
A first lens frame that holds a predetermined first lens group of the plurality of lens groups;
Among the plurality of lens groups, the second lens group adjacent to the rear of the predetermined first lens group in the optical axis direction is held, and the passing subject disposed in front of the second lens group A second lens frame that supports a light amount control member that controls the amount of light in a state that is movable in the optical axis direction and is spring-biased forward in the optical axis direction;
A cam mechanism is provided between the first tube to which the first lens frame is fixed, the first tube, and the second lens frame, and the first lens frame and the second lens are rotated by rotation. A second cylinder that moves the lens frame in the optical axis direction, and includes a first lens group held by the first lens frame and a second lens group held by the second lens frame. A lens barrel that houses the photographing lens and changes the tube length between a retracted state with a relatively short tube length and a extended state with a relatively long tube length;
When the first tube is shifted from the extended state to the retracted state on the back surface facing the rear in the optical axis direction of the first tube or the front surface facing the front in the optical axis direction of the light amount control member, the light amount control member is It has a projection part for pushing down to the optical axis direction back against spring energizing.

  Here, in the camera according to the present invention, the protrusion may be typically provided on a light amount control member, and the protrusion may have a plurality of circumferential directions around the optical axis. It is preferable that each is provided at each location.

  According to the present invention as described above, a part of the lens barrel, not the lens frame, presses the light amount control member, and the lens frame is displaced due to the reaction force from the light amount control member side, or the problem of the adhesion failure. Thus, the operability during assembly and the reliability during use are improved.

  Hereinafter, embodiments of the present invention will be described.

  FIG. 1 and FIG. 2 are perspective views of the camera as one embodiment of the present invention, with the front and back surfaces viewed obliquely from above.

  On the front surface of the camera 10, a lens barrel 100 in a protruding state protruding from the camera body is shown. This lens barrel 100 has a retracted state shown in FIG. 1 and a retracted state in which the tube length is contracted more than the tube length in the extended state and accommodated in the camera body.

  In addition, the lens barrel 100 is provided with a photographing lens 200 including a zoom lens having a variable focal length. Further, a flash light emitting unit 11 that emits flash light at the time of shooting is provided on the front surface of the camera 10, and a shutter button 12 that provides a shooting instruction to the camera 10 is provided on the upper surface of the camera 10.

  2 is a T / W (tele / wide) switching lever 21, a shooting / playback switching button 22, a function button 23, a four-way key 24, an OK key 25, and a DISP / BACK key. 26 and an LCD panel 27 for screen display are arranged.

  Here, the T / W switching lever 21 is a lever for switching the focal length of the photographing lens. The shooting / playback switching button 22 is a button for switching the mode of the camera 10 between the shooting mode and the playback mode every time it is pressed.

  Further, when the function button 23 is pressed, a menu is displayed on the LCD panel 27. Thereafter, the menu is switched with the left and right buttons of the four-way key 24, and any item in the menu is selected with the up and down buttons of the four-way key 24, and the OK button 25 is pressed to set the selected item. By this operation, for example, ISO sensitivity, presence / absence of flash emission, and other various items in the shooting mode or playback mode are set.

  Further, the DISP / BACK key 26 sequentially switches the display mode of images displayed on the LCD panel 27 in the playback mode (displaying only one image / displaying a plurality of thumbnail images side by side) or displaying images, for example. This key is pressed when returning to the previous screen.

  3 to 5 are cross-sectional views along the optical axis showing the internal structure of the lens barrel 100 shown in FIG. 1, and FIGS. 3 to 5 are respectively the wide end (focal length) in the extended state. Are the shortest state), the tele end (the longest focal length state) in the extended state, and the retracted state. Hereinafter, the structure of the lens barrel will be described mainly with reference to FIG. 3 and with reference to FIGS. 4 and 5 as necessary.

  The lens barrel 100 includes a front group lens 210 held by a front group lens frame 310, a rear group lens 220 held by a rear group lens frame 320, and a focus lens 230 held by a focus lens frame 330. Built-in three-group photographic lens, configured so that any or all of the lens groups move in the direction of the optical axis in response to collapsing, extension, tele / wide (T / W) switching, and focus adjustment Has been.

  A zoom drive motor 101 is shown in the lower right of FIG. 3, and when the T / W switching lever 21 shown in FIG. 2 is operated, this zoom drive motor 101 is operated depending on whether it is operated to the tele side or to the wide side. The drive motor 101 rotates forward or reverse. The rotational drive force of the zoom drive motor 101 is transmitted to the drive gear 111 of the drive cylinder 110 via the worm gear 102 and the two-stage gear 103. The drive cylinder 110 rotates around the optical axis in a state in which movement in the optical axis direction is prohibited with respect to the fixed cylinder 120 provided on the inside thereof.

  The fixed cylinder 120 is formed with a cam groove 121 penetrating the wall of the fixed cylinder 120, and the drive cylinder 110 is formed with a key groove 112 extending in the optical axis direction. A cam follower pin 131 fixed to the intermediate cylinder 130 is inserted through a cam groove 121 provided in the fixed cylinder 120. Therefore, when the drive cylinder 110 rotates, the intermediate cylinder 130 rotates with the rotation of the drive cylinder 110 and moves in the optical axis direction according to the shape of the cam groove 121 of the fixed cylinder 120. However, between the wide end shown in FIG. 3 and the tele end shown in FIG. 4, the cam groove 121 of the fixed cylinder 120 extends in the circumferential direction, and the intermediate cylinder 130 does not move in the optical axis direction therebetween. At the same position. Between the retracted state shown in FIG. 5 and the wide end shown in FIG. 3, the intermediate tube 130 moves in the optical axis direction while rotating.

  A straight key ring 140 is provided inside the intermediate cylinder 130. The rectilinear key ring 140 is rotatable relative to the intermediate cylinder 130 and is not allowed to move in the optical axis direction, and is fitted into the rectilinear key groove 122 of the fixed cylinder 120. Accordingly, when the intermediate cylinder 130 moves in the optical axis direction while rotating in accordance with the rotation of the drive cylinder 110, the rectilinear key ring 140 moves in the optical axis direction along with the movement of the intermediate shaft 130 in the optical axis direction. Go straight ahead while keeping the rotation blocked.

  The rear group lens frame 320 that holds the rear group lens 220 is fitted in the key groove 141 of the straight key ring 140, and the rear group lens frame 320 is provided with a cam follower pin 321. The cam follower pin 321 is an intermediate cylinder. The cam groove 132 on the inner surface of 130 is fitted.

  Therefore, when the intermediate cylinder 130 rotates with the rotation of the drive cylinder 110, the rear lens group frame 320 moves in the optical axis direction without rotation according to the shape of the cam groove 132 on the inner surface of the intermediate cylinder 130.

  The rear lens group frame 320 holds the rear lens group 220 and supports a light amount control member 410 including a shutter blade 411 and an aperture blade 412. The light quantity control member 410 is movable in the optical axis direction with respect to the rear lens group frame 320 and is urged forward by the spring member 420 in the optical axis direction. Further, a projection 413 is formed on the front surface of the light quantity control member 410. The protrusion 413 is pressed by a pressing portion 151 of the front moving cylinder 150 described later when the lens barrel is shifted from the extended state (see FIGS. 3 and 4) to the retracted state (see FIG. 5). This is for pushing down the light amount control member 410 backward in the optical axis direction against the urging force of the member 420. In the retracted state, the shutter blade 411 and the diaphragm blade 412 are opened to the maximum opening, and the light amount control member 410 is structured to avoid interference with the rear lens group 220 even when the light amount control member 410 is pushed back in the optical axis direction.

  In addition, a first light shielding member 431 along the rear surface of the rear group lens frame 320 and the rear surface of the rear group lens 220 is fixed to the rear surface side of the rear group lens frame 320 in the optical axis direction. One end is fixed to the rear surface of the first light shielding member, and a second light shielding member 432 that extends obliquely rearward with respect to the optical axis from the rear surface is provided. The first light shielding member 431 and the second light shielding member 432 are for shielding stray light. These light shielding members will be further described later.

  Further, the rear lens group frame 320 is provided with a wall portion 322 that extends so as to cover a feed screw member 470, which will be described later, when viewed from the front in the optical axis direction, and the presence of the wall portion 322 also blocks stray light. Has contributed. Further, although not shown in FIG. 3, the arrangement of the tension spring 461 shown in FIG. 4 also contributes to prevention of stray light. Details will be described later. The tension spring 461 biases the front group lens frame 310 and the rear group lens frame 320 toward each other, and prevents backlash between the front group lens frame 310 and the rear group lens frame 320. is there.

  Further, the front moving cylinder 150 is fitted in the rectilinear key groove 142 of the rectilinear key ring 140 and is prevented from rotating. The front moving cylinder 150 is fixed with a cam follower pin 152 protruding from the outer surface thereof. The cam follower pin 152 is fitted in the cam groove 133 on the inner surface of the intermediate cylinder 130, and when the intermediate cylinder 130 rotates, the cam follower pin 152 moves in the optical axis direction with respect to the intermediate cylinder 130 according to the shape of the cam groove 133.

  The front moving cylinder 150 projects inward toward the optical axis for fixing the front group lens frame 310 storing the front group lens 210, and supports the front group lens frame 310 at a plurality of points in the circumferential direction. A support wall 153 that restricts the position of the group lens frame 310 in the optical axis direction is provided. On the other hand, the front group lens frame 310 has a projecting wall 311 that projects in the radial direction with the optical axis as the center. The overhanging wall 311 is bonded to the support wall 153 of the front moving cylinder 150. The overhanging wall 311 is pressed against the support wall 153 by a lens frame pressing plate spring 451 having one end fixed to the front moving cylinder 150. The lens frame holding plate spring 451 is necessary at the time of assembly.

  Further, an openable / closable lens barrier 460 supported by the front moving cylinder 150 is provided on the front surface of the front group lens 210.

  3 is provided with a focus drive motor 104. When the focus position of the focus lens 230 is obtained by calculation in the camera, the focus lens 230 is moved to the focus position. Accordingly, the focus drive motor 104 rotates. The rotational driving force of the focus driving motor 104 rotates the feed screw 471 through gears 105, 106, and 107.

  A male screw is formed on the outer periphery of the feed screw 471, and a nut 472 fixed to the focus lens frame 330 is screwed into the male screw, and the focus lens is rotated as the feed screw 471 rotates. The focus lens 230 held in the frame 330 moves in the optical axis direction, and an in-focus subject is imaged on the CCD solid-state imaging element 510 held in the CCD holder 511 rearward in the optical axis direction. The CCD solid-state imaging device 510 generates an image signal representing the subject and further performs image processing and the like by an electronic circuit (not shown) to record image data on a recording medium. The processing by the electronic circuit is described in the present invention. Since a known general technique may be applied instead of the subject, a detailed description thereof is omitted here.

  The lens barrel 100 shown in FIG. 3 to FIG. 5 has the above-described structure. By the rotation driving of the zoom drive motor 101 and the focus drive motor 104, the extended state shown in FIG. 3 and FIG. The components of the lens barrel 100 move between the retracted state shown in FIG. 3 and between the wide end shown in FIG. 3 and the tele end shown in FIG.

  Next, some characteristic parts in this embodiment will be described.

  FIG. 6 is a perspective view showing a portion of the front moving cylinder 150 as viewed from the front obliquely. However, in FIG. 6, the lens barrier is removed.

  FIG. 6 also shows a projecting wall 311 projecting in the radial direction of the front moving cylinder 150, the front group lens 210, the front group lens frame 310 (see FIG. 3), and a lens frame pressing plate spring, which are also shown in FIG. 451 is shown. The lens frame pressing plate spring 451 presses the overhanging wall 311 toward the support wall 153 (see FIG. 3) of the front moving cylinder 150 at the pressing portions 451 a at three places in the circumferential direction.

  FIG. 7 shows a conventional example of the support wall and the overhang wall, and corresponds to a comparative example with respect to the present embodiment.

  Moreover, FIG. 8 is a figure which shows the structure of the support wall and overhang | projection wall in this embodiment.

  7 and 8, the left-right direction corresponds to the circumferential direction of the actual lens barrel (see FIG. 3).

  Here, for the sake of easy understanding, also in the comparative example shown in FIG. 7, the members corresponding to the members in the present embodiment are denoted by the same reference numerals and the same names are used.

  In the case of the comparative example shown in FIG. 7, a protruding portion 311 a is provided at a position corresponding to the pressing portion 451 a of the lens frame pressing plate spring 451 on the overhanging wall 311 constituting the lens frame 310 (see FIG. 3). The protrusion 311a is in contact with the support wall 153 constituting the front moving cylinder 150 (see FIG. 3) and is pressed against the support wall 153 by the pressing portion 451a of the lens frame pressing plate spring 451.

  Here, the front lens group frame 310 is adjusted at the time of assembly by adjusting the position of the front lens group 210 held by the front lens group frame 310 in the optical axis direction and the position perpendicular to the optical axis. It is fixed to the front moving cylinder by bonding.

  In order to realize this position adjustment, in the conventional example shown in FIG. 7, the surface of the indicating wall 153 constituting the front moving cylinder 150 on the side supporting the protruding wall 311 of the front lens group frame 310 is circumferential ( In the left-right direction of FIG. 7, the front lens group frame 310 is rotated from the position shown in FIG. 7A to the position shown in FIG. The position of the lens frame 310 in the optical axis direction (the position of the front lens group frame 210 in the optical axis direction) is adjusted. Note that this adjustment structure is provided at three locations around the optical axis, and the front lens group frame 310 is supported by the front movable barrel 150 at three locations around the optical axis.

  In this way, the position of the front group lens 210 is first adjusted in the optical axis direction, and then the front group lens frame 310 is projected on the protruding wall 311 of the front group lens frame 310. However, the front lens group frame 310 is moved in a direction perpendicular to the optical axis within a range in which the support wall 153 of the front moving cylinder 150 is not disengaged from the stage after the optical axis direction adjustment, and the photographing lens 200 (FIG. 1, FIG. (See FIG. 5) Adjustment is made so that the entire optical axis coincides with the optical axis of the front lens group 210. After such position adjustment in the optical axis direction and the direction perpendicular to the optical axis is performed, the front lens group frame 310 is adhered to the front moving cylinder 150 with an adhesive. The lens frame pressing leaf spring 451 plays a role of temporarily fixing the front lens group frame 310 to the front moving cylinder 150 during adjustment and until the adhesive is completely dried.

  Here, in the case of the comparative example shown in FIG. 7, when the state shown in FIG. 7A is shifted to the state shown in FIG. 7B, the pressing portion 451a of the lens frame pressing plate spring 451 differs by a deviation d in the optical axis direction. Move to position. That is, when the front lens group frame 310 is rotated around the optical axis and moved to a different stage of the support wall 153 of the front moving cylinder 150 in an attempt to adjust the position of the front lens group 210 in the optical axis direction, the lens frame pressing plate spring 451 is moved. The pressing force by the pressing portion 451a is different, and when the front group lens frame 310 is moved in a direction perpendicular to the optical axis, the pressing force is too strong or too weak. There is a problem that smooth adjustment is difficult and adjustment work is difficult.

  On the other hand, in the case of FIG. 8, which is the present embodiment, the protrusion 153 a corresponding to the pressing portion 451 a of the lens frame pressing plate spring 451 is provided on the support wall 153 of the front moving cylinder 150. The overhanging wall 311 has the same thickness and has a structure biased stepwise in the optical axis direction. For this reason, when moving from the state of FIG. 8A to the state of FIG. 8B, the front lens group frame 310 itself moves in the optical axis direction, but the position of the pressing portion 451a of the lens frame holding plate spring 451 is It does not change (deviation d = 0). Therefore, the pressing force is kept constant, and the position adjustment in the optical axis direction is performed. As a result, the front lens group frame 310 is moved under the appropriate pressing force regardless of the position. It can be moved in a direction perpendicular to the optical axis.

  Also in this embodiment (in the case of FIG. 8), the structure for this adjustment is provided at three places around the optical axis, and the front lens group frame 310 is arranged at three places around the optical axis. It is supported by.

  Thus, after the position adjustment in the direction of the optical axis and the direction perpendicular to the optical axis is performed, the front lens group frame 310 is fixed to the front moving cylinder 150 with an adhesive.

  FIG. 9 is a perspective view showing the rear surface portion of the rear lens group frame 320 as seen from an oblique direction.

  Here, the rear surface in the optical axis direction of the rear lens group holding frame 320 that holds the rear lens group 220 is shown, and the rear surface of the rear lens group 220 is a region through which light from the object field passes. In addition to a first light shielding member 431 covering the periphery of the first light shielding member 431, a second light shielding member 432 having one end 432a fixed to the back surface of the rear lens group holding frame 320 is provided.

  FIG. 10 is a perspective view showing the rear surface portion of the rear lens group frame 320 as viewed obliquely with the second light shielding member 432 removed.

  As can be seen from the comparison between FIG. 9 and FIG. 10, a protruding slope portion 325 is provided on the back surface of the rear lens group frame 320 in the vicinity of the portion to which the one end 432 a of the second light shielding member 432 is fixed. One end 432a of the second light shielding member 432 is fixed so as to ride on the slope portion 325, and spreads obliquely backward with respect to the optical axis.

  FIG. 4 shows a light beam L1 from the upper part in the object scene and an approach path L2 for stray light from a light source such as the sun at a position outside the object field.

  The first light shielding member 431 has an opening that allows the light beam L1 from the object field to pass normally, and the first light shielding member 431 alone is incident through the approach path L2 shown in FIG. It is not possible to block stray light. Therefore, the second light shielding member 432 is provided, and the second light shielding member 432 plays a role of shielding stray light that has entered through such an approach path L2.

  FIG. 11 is a perspective view showing the back surface of the focus lens frame at an angle when retracted, and FIG. 12 shows the second light shielding member sandwiched between the rear lens group and the focus lens at the time of collapse. It is the perspective view which removed and showed the focus lens frame.

  The second light shielding member 432 is a flexible sheet-like member. As shown in FIG. 4, when retracted, the second light shielding member 432 is sandwiched between the rear group lens 220 and the focus lens 230 and retracted to the rear group lens frame 320. It is pressed toward the rear group lens 220. Therefore, the second light shielding member 432 extends obliquely rearward from the rear group lens frame 320 in the extended state and serves as a light shielding member, and is pressed toward the rear group lens frame 320 when retracted. The tube length when retracted is shortened.

  FIG. 13 is a schematic perspective view showing a tension spring spanned between the front surface of the rear group lens frame and the front group lens frame and the rear group lens frame.

  FIG. 14 is a view showing a conventional structure of the tension spring portion, and corresponds to a comparative example with respect to the present embodiment.

  Here, for the sake of simplicity, in the comparative example shown in FIG. 14, the members corresponding to the members in the present embodiment are denoted by the same names and the same reference numerals.

  In the comparative example shown in FIG. 14, an opening 325 for arranging the tension spring 461 is provided in the rear lens group frame 320, and the tension spring 461 is arranged there. In this case, the opening 325 becomes an approach path for stray light, which may cause flare or the like in the captured image.

  On the other hand, in the case of the present embodiment, as shown in FIG. 13, the tension spring 461 is arranged outside the rear group lens frame 320, and the rear group lens frame 320 has a shape in which the stray light entrance path is blocked. The stray light from the portion corresponding to the opening 325 shown in FIG. 14 is prevented from entering.

  Further, the rear lens group frame 320 is provided with a wall portion 322 so as to cover the front of the feed screw portion 470 (see also FIG. 3) in the optical axis direction, and this wall portion 322 causes the wall portion 322 to be covered. The approach path of stray light trying to enter from this part is blocked.

  FIG. 15 is a schematic view showing a retracted state.

  As shown in FIGS. 3 to 5 and as described above, the light amount control member 410 is provided with a protrusion 413 on the front surface thereof, and when retracted, the light amount control member 410 is pressed by the pressing portion 151 of the front moving cylinder 150. It is pushed and moves backward in the optical axis direction. Further, when retracted, there is a slight gap Δ between the front lens group frame 310 and the light quantity moving member 410.

  Conventionally, a structure in which the light amount control member 410 is pushed by the front group lens frame 310 when retracted is known. However, the front group lens frame 310 is adhered to the front moving cylinder 150 with an adhesive, and the adhesion at the time of assembly is performed. If the retracting operation is performed before the agent is completely solidified, there is a risk that the position of the front lens group frame 310 in the optical axis direction shifts and hardens as it is, and if the adhesion is somewhat weak, this camera There is a risk that the front group lens frame 310 may fall off due to the reaction force that the front group lens frame 310 receives from the light amount control member 410 while the lens is used for a long time.

  In the present embodiment, since the light amount control member 410 is provided with the protrusion 413 and is surely pushed by the front moving cylinder 50, the above-described problems of positional deviation in the optical axis direction and dropping of the front lens group frame 310 are avoided. Is done.

  In this embodiment, the protrusion 413 is provided on the light quantity control member 410. However, a protrusion may be provided on the pressing part 151 of the front moving cylinder 150 and the light quantity control member 410 may be pushed by the protrusion.

  In addition, although the present embodiment is a camera including a photographing lens including three groups of zoom lenses, the present invention can be similarly applied to a camera including a photographing lens including four or more lens groups.

It is the perspective view which showed the front of the camera as one Embodiment of this invention seeing from diagonally upward. It is the perspective view which showed the back of the camera as one Embodiment of this invention seeing from diagonally upward. It is sectional drawing of the direction in alignment with an optical axis which shows the internal structure of the lens barrel shown in FIG. It is sectional drawing of the direction in alignment with an optical axis which shows the internal structure of the lens barrel shown in FIG. It is sectional drawing of the direction in alignment with an optical axis which shows the internal structure of the lens barrel shown in FIG. It is the perspective view which showed the front movement cylinder seeing from the front diagonal. It is a figure which shows the prior art example of a support wall and an overhang | projection wall. It is a figure which shows the structure of the support wall and overhang | projection wall in this embodiment. It is the perspective view which showed the back surface part of the rear group lens frame seeing from diagonally. It is the perspective view which looked at the back part of the rear group lens frame from the diagonal, removing the 2nd light shielding member. It is the perspective view which looked at the back of the focus lens frame at the time of retraction, and saw it from diagonally. It is the perspective view which removed the focus lens frame and showed the 2nd light shielding member of the state pinched | interposed between the rear group lens and the focus lens at the time of collapse. FIG. 6 is a schematic perspective view showing a front surface of a rear group lens frame and a tension spring stretched between the front group lens frame and the rear group lens frame. It is a figure which shows the conventional structure of the part of a tension spring. It is a schematic diagram which shows a retracted state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Camera 11 Flash generation part 12 Shutter button 21 T / W (tele / wide) switching lever 22 Shooting / playback switching button 23 Function button 24 Four-way key 25 OK key 26 DISP / BACK key 27 LCD panel for screen display 100 Lens Lens barrel 110 Drive cylinder 120 Fixed cylinder 130 Intermediate cylinder 140 Linear key ring 150 Front moving wall cylinder 151 Pressing section 153 Support wall 200 Shooting lens 210 Front group lens 220 Rear group lens 230 Focus lens 310 Front group lens frame 311 Overhang wall 320 Rear group lens frame 322 Wall portion 330 Focus lens frame 410 Light amount control member 413 Projection portion 431 First light shielding member 432 Second light shielding member 451 Lens frame presser plate spring 461 Tension spring

Claims (3)

In a camera that captures and captures subject light that has entered through a taking lens composed of a plurality of lens groups,
A first lens frame that holds a predetermined first lens group of the plurality of lens groups;
Of the plurality of lens groups, the second lens group adjacent to the rear of the predetermined first lens group in the optical axis direction is held, and the passing subject light disposed on the front surface of the second lens group A second lens frame that supports a light amount control member that controls the amount of light in a state that is movable in the optical axis direction and is spring-biased forward in the optical axis direction;
A cam mechanism is provided between the first cylinder to which the first lens frame is fixed, the first cylinder, and the second lens frame, and the first lens frame and the second lens frame are rotated by rotation. A second cylinder for moving the second lens frame in the optical axis direction, and a first lens group held by the first lens frame and a second lens held by the second lens frame. And a lens barrel that changes the tube length between a retracted state with a relatively short tube length and a extended state with a relatively long tube length.
When the first tube is moved from the extended state to the retracted state on the back surface facing the rear in the optical axis direction of the first tube or the front surface facing the front in the optical axis direction of the light amount control member, A camera having a projection for pushing down the light amount control member rearward in the optical axis direction against a spring bias.   The camera according to claim 1, wherein the protrusion is provided on the light amount control member.   The camera according to claim 1, wherein the protrusions are provided at a plurality of locations in the circumferential direction around the optical axis.

Images