JP2006091508A - Camera lens barrel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera lens barrel which is improved in the light shielding performance at the inside of the lens barrel where a flexible printed wiring board is installed. <P>SOLUTION: A focusing motor 32 and a 1st lens group 36 are attached to a straight advancing cylinder 16. A 2nd lens group 13 and a shutter apparatus are attached to a frame body 10. When a rotating cylinder 8 is rotated against a fixed cylinder 5, a distance between the cylinder 16 and the frame body 10 is changed, thereafter, when the motor 32 is rotated, the 1st lens group 36 is moved on the cylinder 16. The flexible printed wiring board FPC for connecting the motor 32 to a power source is foldable, two flexible light shielding plates 44 and 45 attached to a shutter cover plate 12 come in contact with the folding surface from different directions, then, the light shielding effect of clearance holes formed in the frame body 10 and the cover plate 12 is enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a camera lens barrel in which a shutter device is mounted in a lens barrel, and a lens group mounted on a subject side is moved by a motor mounted in the vicinity thereof to perform focus adjustment. .

  Zooming is performed by changing the distance between the first lens group disposed on the subject side and the second lens group disposed behind the first lens group, and the first lens group disposed behind the second lens group. A lens barrel for a camera in which focus adjustment is performed by moving three lens groups is known from Patent Document 1 below. In the case of the lens barrel having such a configuration, as described in Patent Document 1, the zooming motor and the focus adjustment motor are both a camera body (camera body), The lens barrel is usually fixed near the camera body.

  On the other hand, it is known that the first lens group or the second lens group having the above-described configuration is used without providing the third lens group for focus adjustment. In that case, the focus adjustment motor is fixed to the cylinder body to which the lens group to be used as the lens group is attached, and is moved together with the lens group together with the cylinder body during zooming. At least some of the lenses in the lens group are moved on the cylinder. Therefore, in the case of this type of lens barrel, when a flexible printed wiring board for connecting the focus adjustment motor to the power source is arranged in the lens barrel and the motor moves to the camera body side together with the cylinder, It is designed to sag inside the lens barrel.

  In addition, the lens barrel described in Patent Document 1 is also a so-called collapsible type in which the lens barrel is stored in the camera body when the camera is not used and is pulled out only when used. The so-called lens barrel is known. Even in the case of this type of lens barrel, the relative position of the focus adjustment lens and the camera body changes between when the camera is used and when it is not used, regardless of whether or not it has a zoom function. There is something to end up with. Therefore, in the case of such a configuration and a configuration in which a focus adjustment motor is fixed to a movable cylinder having a focus adjustment lens attached, as described above, In some cases, a flexible printed wiring board is disposed. An example of doing so is described in Patent Document 2 below.

Furthermore, some lens barrels are known in which a shutter device is disposed within the lens barrel. In that case, normally, considering the layout in the lens barrel, as in the configuration described in Patent Document 1, the shutter device is a frame body (zoom type or zoom type) disposed behind the first lens group. It is usually attached to the case that it is not retractable. Therefore, in the lens barrel described in Patent Document 1, in order to eliminate the need for the third lens group for focus adjustment, the focus adjustment motor is attached to the frame body to which the shutter device is attached. Instead of mounting, it is preferable that the first lens group is fixed to a cylindrical body to which the first lens group is mounted, and the first lens group is also moved during focus adjustment. In this way, in the lens barrel in which the shutter device is mounted in the lens barrel, the focus adjustment motor is disposed in the vicinity of the lens group existing on the subject side of the shutter device, and the power supply connection is made. The flexible printed wiring board for the camera is placed in the lens barrel up to the close position of the camera body, and the distance between the motor and the camera body can be changed. is there.
JP 2003-57705 A JP 2004-163748 A

  By the way, the lens barrel that is the subject of the present invention is a frame body that is fixed or movable along the optical axis on the camera body side than the focus adjustment motor arranged in the lens barrel. A shutter device is attached. Therefore, until now, a flexible printed wiring board can be arranged in the lens barrel by forming a notch-shaped relief portion in a region near the outer shape of the frame body to which the shutter device is attached, and passing through it. I was doing. However, such a relief portion is formed to be relatively large so that the flexible printed wiring board can sag suitably, so that even if the shutter blade closes the photographing optical path, the clearance from the first lens group. Incident light wraps around the camera body from the escape portion. Therefore, in order to employ it in a silver salt film camera, the light shielding measures have been extremely difficult. In addition, when it is used in a digital camera, it may not be as problematic as in the case of a silver salt film camera, but when the shooting is finished and the imaging information is transferred to the storage device, such a detour is made. When light hits a solid-state image sensor, a smear phenomenon becomes noticeable as is well known, and a good image cannot be obtained. Therefore, it is necessary to take some measures.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a shutter device attached to a frame body disposed in a lens barrel, and the frame body. In part of the lens barrel formed with a relief for passing through the flexible printed wiring board that connects the focus adjustment motor and the power supply, the light incident from the lens group on the subject side passes through the relief. It is an object of the present invention to provide a camera lens barrel configured so as not to easily travel to the camera body side.

  In order to achieve the above object, a lens barrel for a camera according to the present invention is disposed inside a first tube integral with a camera body, and is optically coupled with a first lens group corresponding to the rotation direction of a first motor. A second cylinder that reciprocates along the axis and moves in and out of the subject from the first cylinder, and is fixed to the second cylinder and moves the first lens group along the optical axis on the second cylinder during focus adjustment. And a second motor that is reciprocally operated, and a plurality of bent portions that are bent in opposite directions alternately at predetermined intervals between one end connected to the second motor and the other end on the camera body side. A foldable flexible printed wiring board, and a relief portion that is disposed inside the first cylinder with a shutter device attached thereto, and for inserting the flexible printed wiring board from the second motor side to the camera body side. With the forming frame A light-shielding plate attached to the frame body or the shutter device and having a flexible free end thereof facing the escape portion and inserted between the folded surfaces of the flexible printed wiring board. Like that.

  In that case, in addition to the light shielding plate, another light shielding plate is provided, and the free ends of the light shielding plates face the escape portion so as to overlap from opposite directions, respectively. If it is inserted between the folded surfaces on different sides of the printed wiring board, the light shielding property can be obtained more suitably. In addition to the shutter device, the frame has a second lens group attached thereto, and is disposed so as to be movable along the optical axis in the first cylinder. The first motor causes the first lens to move. If the distance between the lens groups can be changed, both a lens barrel capable of zooming and a retractable lens barrel are suitable.

  According to the present invention, a shutter device is attached to a frame body arranged in a lens barrel, and a flexible printed wiring board for connecting a focus adjusting motor and a power source is passed through a part of the frame body. In the lens barrel formed with the relief portion, the flexible printed wiring board can be folded by forming a plurality of bent portions that are alternately bent in opposite directions at predetermined intervals, and is flexible for the frame or shutter device. A light-shielding plate is attached and the free end of the light-shielding plate faces the escape portion so that it can be inserted between the folding surfaces of the flexible printed wiring board. There is an advantage that it becomes difficult to proceed to the camera body side via the. Therefore, when such a lens barrel is employed in a silver salt film camera, other light shielding measures are simplified, and when it is employed in a digital camera, other light shielding measures are not required.

  Embodiments of the present invention will be described with reference to the illustrated examples. In the embodiment, the present invention is applied to a retractable digital camera equipped with a zoom lens, and FIG. 1 is a cross-sectional view showing the camera not in use (collapsed state of the photographing lens). 2 is a cross-sectional view showing a state in which the photographing lens is extended from the position shown in FIG. 1 to a usable position of the camera (telestate), and FIG. 3 shows the frame 10 shown in FIGS. It is the top view seen from the side. 4 is a plan view of the straight cylinder as viewed from the imaging element side in the state of FIG. 1, and FIG. 5 is a plan view of the barrier mechanism in the straight cylinder as viewed from the imaging device side in the state of FIG. 6 is a plan view showing the barrier chamber with the cover plate removed from FIG. 7 is a sectional view taken along line AA in FIG. 4, FIG. 8 is a sectional view taken along line BB in FIG. 4, and FIG. 9 is a sectional view taken along line CC in FIG. FIG. 10 is a sectional view showing the moving state of the first lens group with respect to the rectilinear cylinder, and FIG. 10A shows the state in which the first lens group is in the right limit position with respect to the rectilinear cylinder. FIG. 10B shows a state in the left limit position. Further, FIG. 11 is a plan view of the inside of the lens barrel shown in FIGS. 1 and 2 as viewed from the image pickup apparatus 3 side, and FIG. 12 is a plan view in which the two light shielding plates are removed from FIG. is there. Further, FIG. 13 is a cross-sectional view as viewed from substantially below in FIG. 1, FIG. 14 is a cross-sectional view as viewed from approximately below in FIG. 2, and FIG. It is sectional drawing shown.

  First, among the configurations of the present embodiment, the configuration of the lens feeding mechanism will be described mainly with reference to FIGS. The base member 1 shown in FIGS. 1 and 2 has a slit 1a for inserting a flexible printed wiring board FPC, which will be described later, and is attached to a camera body (not shown) by appropriate means. The imaging device 3 is attached with at least one screw 2. As is well known, the image pickup apparatus 3 includes a solid-state image pickup device such as a CCD. Usually, a filter plate such as a low-pass filter and a transparent cover plate are disposed on the subject side. The base member 1 has a columnar cam member 4 attached to the subject side surface. The cam member 4 has a substantially square cross section, and a cam surface is shown at the tip of the cam member 4. 2 is formed as a linear slope as shown in FIG.

  A fixed cylinder 5 is integrally attached to the surface of the base member 1 on the subject side by means not shown. Although the shape and arrangement are not clearly shown on the inner peripheral surface of the fixed cylinder 5, as will be known (also described in Patent Document 1), the rotating cylinder 8 described later is provided at equal angular positions. Are formed with three cam grooves 5a that can move in the optical axis direction while rotating. FIG. 1 is a cross-sectional view showing two of the cam grooves 5a. In addition, on the inner peripheral surface of the fixed cylinder 5, in order to enable a key cylinder 9 (to be described later) to move linearly in the direction of the optical axis along with the movement of the rotating cylinder 8, parallel to the optical axis. Two key grooves 5b are formed so as not to interfere with the cam groove 5a.

  The fixed cylinder 5 shown in FIG. 2 is a cross-sectional view of the upper portion of the fixed cylinder 5 at an angular position different from that in FIG. 1, and the fixed cylinder 5 includes two overhang portions 5c, 5d is formed. A shaft 6a erected on the motor mounting plate 6 is fitted in the holes provided in the overhang portions 5c and 5d, and the gear 7 is rotatably fitted on the shaft 6a. , A part thereof faces the inside of the fixed cylinder 5. The motor attachment plate 6 is attached with a step motor and a reduction gear (not shown), and is attached to the camera body separately from the base member 1.

  A rotating cylinder 8 is arranged inside the fixed cylinder 5. As shown in FIG. 2, the rotary cylinder 8 has a partial gear 8 a formed at a predetermined angle range at the end on the imaging device 3 side, and meshes with the gear 7. I am letting. Further, on the outer peripheral surface of the rotating cylinder 8, three pins 8 b are provided at equal angular positions, and they are fitted in the cam grooves 5 a provided in the fixed cylinder 5, respectively. Therefore, when the rotating cylinder 8 rotates around the optical axis, the rotating cylinder 8 is also moved in the optical axis direction by the cam groove 5a. Further, two types of cam grooves 8c and 8d (see FIG. 2 for 8d) having different cam shapes are formed on the inner peripheral surface of the rotary cylinder 8 at three equally spaced angular positions. Are alternately arranged. Among them, the cam groove 8c having one shape is for moving a frame body 10 described later in the optical axis direction, and the cam groove 8d having the other shape is a straight cylinder 16 described later. It is for moving in the optical axis direction.

  A key cylinder 9 is disposed inside the rotary cylinder 8 and is configured to move linearly in the optical axis direction when the rotary cylinder 8 rotates. That is, a plurality of flexible hook portions 9 a are formed at predetermined angular positions on the subject-side end of the key cylinder 9, and these are formed in an annular shape on the inner periphery of the rotary cylinder 8. It is made to fit in the groove 8e. Further, the key cylinder 9 is formed with two keys 9b on the imaging device 3 side, and as shown in FIG. 1, they are fitted in the two key grooves 5b. Accordingly, the key cylinder 9 is guided by the key groove 5b of the fixed cylinder 5 and linearly only in the optical axis direction when the rotary cylinder 8 is rotated by the gear 7 and moves in the optical axis direction by the cam groove 5a. Will be moved. Further, in this key cylinder 9, two types of key grooves 9c, 9d are alternately formed in three angular positions at equal intervals so as to be parallel to the optical axis. Of these, the key groove 9c is inserted into a distal end portion of an arm portion 10a of the frame 10 to be described later, and a pin 10b provided at the distal end portion can be fitted into the cam groove 8c of the rotary cylinder 8. ing. Further, the key groove 9d is configured to pass through a pin 16a of a straight cylinder 16 which will be described later and to be fitted into the cam groove 8d of the rotary cylinder 8.

  Therefore, first of all, the shape of the frame 10 and the members attached to the frame 10 and the straight cylinder 16 will be described. As shown in FIG. 3, the frame 10 has three arm portions 10a radially, and the bent portion at the tip thereof is inserted into the key groove 9c of the key tube 9 as described above. Pins 10b provided at the tip portions thereof are fitted into the cam grooves 8c of the rotating cylinder 8. Therefore, when the rotary cylinder 8 rotates, the frame 10 moves while the pin 10b is guided by the cam groove 8c, but is also guided by the key groove 9c of the key cylinder 9. It does not rotate and moves linearly only in the direction of the optical axis. The amount of movement differs from the amount of movement of the rotating cylinder 8 in the optical axis direction depending on the shape of the cam groove 8c, and the direction may vary depending on the design.

  A shutter device and a second lens group are attached to the frame body 10. First, the shutter device will be briefly described. Although not shown in FIG. 3, a driving means 11 such as a motor is attached to the surface of the frame 10 on the subject side, as shown by blocks in FIGS. 1 and 2. Further, a shutter cover plate 12 is attached to the frame 10 on the imaging device 3 side with a predetermined interval, and shutter blades (not shown) are arranged between them. Therefore, it can be said that this frame 10 is a shutter base plate from the viewpoint of a shutter device. However, the shutter device may be configured as a unit and the unit may be attached to the frame body 10 without being configured in this way. In addition, when a diaphragm device is also required, a driving device for the diaphragm device is also attached to the subject side of the frame body 10, and between the frame body 10 and the shutter cover plate 12, a diaphragm blade in addition to the shutter blades. It will be sufficient to arrange. Details of the shutter cover plate 12 and members attached to the imaging device 3 will be described later.

  Next, the mounting configuration of the second lens group will be described. As shown in FIG. 3, the second lens frame 14 to which the second lens group 13 is attached has three projecting portions 14a radially, and a hole 14b formed in one of them. The guide pin 10c provided on the frame 10 is fitted. And three pin 16c provided in the linear cylinder 16 mentioned later can contact the front-end | tip part vicinity position of those overhang | projection parts 14a. The second lens frame 14 has a cylindrical portion 14c that holds the second lens group 13 fitted in the hole 10d of the frame body 10, and is movable in the optical axis direction with respect to the frame body 10. However, as shown in FIGS. 1 and 2, a plurality of hook portions 14d provided at a predetermined angular interval on the imaging device 3 side serve to prevent the object from being removed. Further, a spring 15 having a winding diameter larger than the outer diameter of the cylindrical portion 14c is fitted into the cylindrical portion 14c, and one end of the spring 15 is formed on the lower right overhanging portion 14a as shown in FIG. The other end is hung on the groove 10e formed at the edge of the hole 10d of the frame body 10, and the second lens frame 14 is urged toward the subject side with respect to the frame body 10. And urged to rotate clockwise.

  Here, a method of assembling the second lens frame 14 to the frame 10 will be described. Although not shown in FIG. 3, in addition to the groove 10e described above, a plurality of grooves that can pass through the hook portion 14d of the second lens frame 14 are provided at the edge of the hole 10d of the frame body 10. Is formed. Therefore, when the plurality of hook portions 14d of the second lens frame 14 are passed through the grooves from the subject side and rotated about the optical axis, the overhanging portion 14a forming the spring hooking portion 14e becomes the guide pin. 10c. Therefore, when the overhanging portion 14a is bent toward the object side and rotated, and when the hole 14b is positioned opposite the guide pin 10c, the overhanging portion 14a is restored to its original shape by its own elasticity. 14b and the guide pin 10c are fitted, and the assembled state of both is obtained. However, it goes without saying that there are various other assembly methods. In this embodiment, the second lens group 13 is attached to the second lens frame 14, which is a separate member from the frame body 10. Needless to say, the second lens group 13 may be directly attached to the frame body 10. . Therefore, in such a configuration, it can be said that the frame body 10 is the second lens frame. In the case of the present embodiment, as can be seen from FIG. 3, the frame 10 is not substantially circular, and the clearance 10k is formed by notching between the two arms 10a at the lower position. Such a shape will be described later.

  Next, the rectilinear cylinder 16 in the present embodiment and the members assembled thereto will be described. First, three pins 16a (only one is shown in FIG. 2) are provided on the outer periphery of the straight cylinder 16 at angular positions at equal intervals. It is inserted into the key groove 9 d and the tip is fitted into the cam groove 8 d of the rotary cylinder 8. Therefore, when the rotary cylinder 8 rotates, the straight cylinder 16 moves while the pin 16a is guided by the cam groove 8d, but is also guided by the key groove 9d of the key cylinder 9. Does not rotate, and moves linearly only in the optical axis direction. The amount of movement differs from the amount of movement of the rotating cylinder 8 in the optical axis direction depending on the shape of the cam groove 8d, and the direction may vary depending on the design. The straight cylinder 16 is provided with a well-known decorative member 17 on the outer surface, and an opening 16z for a photographing optical path is formed in a wall 16b formed on the subject side.

  A barrier mechanism and a focus adjustment mechanism including the first lens group are disposed inside the rectilinear cylinder 16. Therefore, first, the constituent members of the barrier mechanism and the mounting configuration thereof will be described mainly with reference to FIGS. As can be seen from FIG. 6, in addition to the three pins 16c provided on the inner surface of the wall 16b of the rectilinear cylinder 16, three shafts 16d, 16e, 16f, two receiving portions 16g, 16h, There are provided two stoppers 16i, 16j, three mounting portions 16k, 16m, 16n, three bearing holes 16p, 16q, 16r, two hollow portions 16s, 16t having a thin wall 16b, and a pin 16u. And the screw hole is formed in the front end surface of attachment part 16k, 16m, 16n. Further, as shown in FIG. 6, a hooking portion 16v is provided on the inner surface of the cylindrical portion of the straight cylinder 16 so as to form a space between the wall 16b and parallel to the optical axis. A key groove 16w is also formed, and although not shown in FIG. 6, a locking portion 16x as shown in FIG. 8 is provided at an upper position in FIG. .

  As can be seen from FIG. 6, barrier plates 18 and 19 are rotatably attached to the shafts 16d and 16e. The barrier plates 18 and 19 have engaging portions 18a and 19a in addition to the shielding portion covering the opening 16z. In FIGS. 4 and 5, the drawings are easy to see. In addition, the reference numerals of the engaging portions 18a and 19a are omitted. The barrier plates 18 and 19 have a similar shape at first glance, but actually have different shapes. That is, the barrier plate 18 has a flat plate shape from the engaging portion 18a to the shielding portion, but the barrier plate 19 has a bent portion 19b (see FIG. 4) between the engaging portion 19a and the shielding portion. Is omitted). For this reason, the two barrier plates 18 and 19 have their shielding portions operating on the same plane, and the size of the lens barrel in the optical axis direction is reduced due to the arrangement with the first lens group 36 described later. It is useful for.

  The two barrier plates 18 and 19 are arranged in a barrier chamber formed between the wall 16b of the straight cylinder 16 and the barrier cover plate 20. Therefore, next, the configuration of the barrier cover plate 20 and the configuration related to the cover plate 20 and the barrier plates 18 and 19 will be described. As shown in FIG. 5, the barrier cover plate 20 is in contact with the receiving portions 16g and 16h and the stopper 16i from the imaging device 3 side (front side in FIG. 5) to prevent movement to the wall 16b side. Thus, a barrier chamber is formed between the wall 16b. Therefore, the stopper 16i also serves as a receiving portion. Further, two spring shaft members 21 and 22 are fixed to the barrier cover plate 20 by caulking, and a hole formed on the subject side is fitted to the tip of the shafts 16d and 16e, The movement toward the wall 16b is also prevented by the tips of the shafts 16d and 16e (see FIGS. 7 and 9). A spring (not shown) is wound around the spring shaft members 21 and 22, and one end of each of the spring shaft members 21 and 22 is hung on the barrier plates 18 and 19. 23 is hung on the lower side of the pin 23a.

  Further, since the barrier cover plate 20 is a thin member and has flexibility in itself, the bent portion 20a formed at the upper position in FIG. It is hung on the locking portion 16x and is prevented from moving toward the imaging device 3 side. Note that the lower part of the cover plate 20 in FIG. 5 is lifted to the image pickup apparatus 3 side only by such an assembly method. In the case of this embodiment, such means is provided by means described later. The barrier cover plate 20 is substantially parallel to the wall 16b by supporting the lower portion thereof. As described above, the barrier mechanism of this embodiment is characterized in that when the barrier plates 18 and 19 and the barrier cover plate 20 are attached to the rectilinear cylinder 16, no dedicated fixing member is used.

  As can be seen from FIG. 5, the cover plate 20 assembled in this way has an opening 20b for the photographing optical path in the substantially central portion, and is a lower portion of the long hole 20c formed at the upper position. One of the three pins 16c described above is passed through. Further, from the edges of the two holes 20d and 20e formed at the position sandwiching the opening 20b, hook portions 20f and 20g (the hook portion 20g of the hook portion 20g) having a shape that stands up toward the imaging device 3 and bends the tip into a bowl shape. 8) is formed, and one of the pins 16c is passed through one of the holes 20e. Further, the barrier cover plate 20 has a hole 20h that penetrates the other pin 16c, a hole that penetrates the shaft 16f (no symbol), and a hole that penetrates the attachment portion 16n (no symbol). Are formed, and a bent portion 20i and a spring hook portion 20j are formed.

  A barrier connecting member 23 is rotatably attached to the shaft 16f on the imaging device 3 side of the barrier cover plate 20, and is prevented from coming off by a stopper member 24 (see also the sectional view of FIG. 8). The barrier connecting member 23 has a pin 23a on the wall 16b side and a pin 23b on the imaging device 3 side, and is biased to rotate clockwise in FIG. 5 by a spring (not shown). ing. The pin 23a passes through the long hole 20c and can come into contact with the engaging portions 18a and 19a of the barrier plates 18 and 19 in the barrier chamber, and the tip thereof is inserted into the recess 16t. . Further, the pin 23 b can come into contact with the cam member 4 attached to the base member 1.

  In the present embodiment, the shielding cylinder 25 is disposed so as to be in contact with such a barrier cover plate 20. The shielding cylinder 25 has a cylindrical shape that is larger in diameter than the opening 20b of the barrier cover plate 20 and shorter in the axial direction than the rectilinear cylinder 16, and as shown in FIG. The two protrusions 25a and 25b formed radially are inserted into and engaged with the hooks 20f and 20g (the engagement relationship between the hook 20g and the protrusion 25b is also shown in FIG. 8). ) Therefore, it can be said that the hook portions 20f and 20g are restricting portions for preventing the shielding cylinder 25 from moving in the direction along the optical axis. On the other hand, as far as the relationship with the barrier cover plate 20 is concerned, in the state shown in FIG. 5, the shielding cylinder 25 can be moved in a direction perpendicular to the optical axis.

  Next, mainly using FIG. 4 and FIGS. 7 to 9, constituent members related to the focus adjustment mechanism and their assembled configurations will be described. The sensor mounting plate 27 to which the sensor 26 is mounted fits the pin 27a shown in FIG. 9 into the hole 16y (not shown in FIGS. 5 and 6) of the straight cylinder 16, and one end thereof is shown in FIG. The other end is attached to the attachment portion 16k by the screw 28 while being hung on the described hook portion 16v. In addition, the motor attachment plate 31 is attached to the two attachment portions 16m and 16n described with reference to FIG. 6 by screws 29 and 30. In the attached state, the holes are formed in the holes formed therein. The pins 16u and 16c are fitted. The motor mounting plate 31 is in contact with the bent portion 20i (see FIG. 8) to prevent the barrier cover plate 20 from being lifted as described above. As can be seen from FIG. 9, the sensor mounting plate 27 can also prevent the barrier cover plate 20 from being lifted.

  A step motor 32 is attached to the motor attachment plate 31, and its output gear 33 is disposed between the wall 16 b of the straight cylinder 16 and the motor attachment plate 31. The step motor 32 has four terminal pins 32a, and one end of the flexible printed wiring board FPC is joined to them. The other end of the flexible printed wiring board FPC is led out of the lens barrel from the slit 1a formed in the base member 1 to be connected to the power source, and is fixed to the base member 1 by means not specified. Yes. The gear 34 shown only in FIG. 4 is disposed between the wall 16b and the motor mounting plate 31, and the rotation shaft is supported by the bearing hole 16p and the motor mounting plate 31 so as to output the output. It meshes with the gear 33. A first lens frame 35 is disposed in the rectilinear cylinder 16. The first lens frame 35 holds the first lens group 36 in a cylindrical portion 35 a, and the cylindrical portion 35 a is fitted in the shielding cylinder 25. A part of the first lens group 36 protrudes from the cylindrical portion 35a to the subject side, and a mask 37 having a substantially rectangular opening is attached to the front surface thereof.

  As shown in FIG. 4, the first lens frame 35 is provided with arm portions 35b, light shielding portions 35c, and overhang portions 35d in a radial manner. Among them, the arm portion 35b has a distal end fitted in the key groove 16w, and when the step motor 32 rotates, the optical axis with respect to the rectilinear cylinder 16 via a transmission mechanism as will be described later. It can move in the direction. The light-shielding portion 35c can enter and exit the slit provided in the sensor 26, and when the rectilinear cylinder 16 is retracted into the fixed cylinder 5, the sensor 26 is connected to the rectilinear cylinder 16 and the first lens frame 35. The reason for this is described later.

  Further, the projecting portion 35d of the first lens frame 35 has a complicated shape. First, as shown in FIG. 8, one end of a relatively long guide pin 38 is press-fitted into the hole 16q formed in the wall 16b of the rectilinear cylinder 16. On the other hand, the overhanging portion 35d is provided with two bent portions 35e and 35f having a predetermined interval in the direction along the optical axis, and the holes formed in these portions are fitted into the guide pins 38. It is combined. Further, a spring hooking portion 35g is provided in the vicinity of the bent portion 35e, and a spring 39 is hung between the barrier cover plate 20 and the pulling 39 is always the first lens. This is to stabilize the position of the first lens frame 35 moved by a lead screw mechanism, which will be described later, by urging the frame 35 toward the subject, and is commonly referred to as a backlash spring or the like. is there.

  Furthermore, as can be seen from FIG. 7, the overhanging portion 35d is provided with a cylindrical portion 35h having a wall at one end in the axial direction, and a circular hole 35i is formed in the wall. In addition, an inserted portion 35j for inserting a part of the nut member 40 is formed in the vicinity of the cylindrical portion 35h. The nut member 40 is made of metal and has a keyhole shape in which the planar shape is composed of a circular portion and a rectangular portion, and a female screw is formed on the inner periphery of the circular hole provided in the center of the circular portion. In addition, only the rectangular portion is detachably inserted into the insertion portion 35j. On the other hand, in the inserted portion 35j, the lower portion of FIG. 7 is an insertion port of the rectangular portion, which is not clearly shown. However, when the nut member 40 is inserted, the nut member 40 is shown in FIG. The shape is substantially immovable in the direction perpendicular to the paper surface. Further, since the first lens frame 35 is made of synthetic resin, a hole 35m is formed to form the wall 35k as shown in FIGS. In the state of FIG. 7 screwed, the nut member 40 is hardly movable in the left-right direction of FIG.

  The lead screw 41 of the present embodiment is made of metal and has a shaft portion 41a at one end and a slot 41b at the other end as shown in FIG. Forms a male screw 41c, and a cylindrical portion 41d is formed from the portion where the male screw 41c is formed to the end where the slit 41b is formed. Further, the lead screw 41 has a gear 42 attached thereto by press-fitting between the formation portion of the male screw 41c and the shaft portion 41a. The gear 42 is connected to the wall 16b of the straight cylinder 16 and the motor mounting plate 31. As shown in FIG. 4, it is arranged between the gears 34. In the state shown in FIG. 7, the lead screw 41 has a shaft portion 41a rotatably fitted in a hole 16r provided in the wall 16b, and a column portion 41d provided in the cylindrical portion 35h of the first lens frame 35. The first lens frame is fitted in the hole 35i so as to be slidable in the optical axis direction.

  Here, how to assemble the first lens frame 35 and the lead screw 41 will be described. As can be understood from the above description, the assembly state before the first lens frame 35 and the lead screw 41 are assembled is the state shown in FIG. 5 in which the guide pin 38 is inserted into the bearing hole 16q of the straight cylinder 16. One end is press-fitted. In that state, first, the lead screw 41 is temporarily assembled. The shaft portion 41a of the lead screw 41, to which the gear 42 is previously attached, is fitted in the hole 16r of the rectilinear cylinder 16, and then the hole 31a of the motor mounting plate 31 is connected to the slot 41b side of the lead screw 41. The motor attachment plate 31 is attached to the straight cylinder 16 with screws 29 and 30. Therefore, the lead screw 41 in that case is in an extremely unstable state even though the gear 42 meshes with the gear 34 and is prevented from being detached by the motor mounting plate 31, and is in an unstable state with respect to the wall 16b. It is difficult to maintain a vertical posture.

  In this case, the first lens frame 35 is assembled. In this case, the rectangular portion of the nut member 40 is inserted into the inserted portion 35j, and the nut member 40 is dropped. While taking care not to align, the alignment of the tip of the arm portion 35b with the key groove 16w of the rectilinear cylinder 16, the alignment of the hole of the overhang portion 35d and the guide pin 38, the hole of the nut member 40 and the lead The first lens frame 35 is moved toward the wall 16b of the rectilinear barrel 16 by aligning with the end of the screw 41 on the side of the slit 41b. Therefore, the female thread forming hole of the nut member 40 fits into the cylindrical portion 41d of the lead screw 41. Immediately thereafter, the cylindrical portion 35h of the first lens frame 35 is inserted into the cylindrical portion 41d of the lead screw 41. Therefore, after that, there is no need to pay attention to the nut member 40 dropping off.

  In that state, when the first lens frame 35 is still moved and the hole 35i is fitted to the cylindrical portion 41d of the lead screw 41, immediately after the formation surface of the slot 41b protrudes to the opposite side of the hole 35i, Since the female screw of the nut member 40 abuts on the male screw of the lead screw 41, the first lens frame 35 cannot be further straightened as it is. On the other hand, at that stage, the cylindrical portion 35a of the first lens frame 35, which is the mounting portion of the first lens group 36, has not yet been fitted into the shielding cylinder 25 and has reached the position immediately before it. After that, when the tip of the minus driver is inserted into the slot 41b and rotated, the female screw and the male screw are engaged with each other, and the first lens frame 35 can be moved straight.

  As already described, in the present embodiment, the shielding cylinder 25 is fitted into the cylindrical portion 35a of the first lens frame 35. The shielding cylinder 25 is integrated with the barrier cover plate 20. It is not. That is, the barrier cover plate 20 is attached so as not to be displaced relative to the rectilinear cylinder 16 even though no dedicated fixing member is used. It can be said that it is attached. However, the shielding cylinder 25 is not integrally attached to the barrier cover plate 20, and in the state shown in FIG. 5, the movement in the direction along the optical axis is restricted. In the orthogonal direction, it is possible to move slightly in either direction, and in particular, in the lower left direction, it is possible to move more than the other directions because of the convenience of assembly. Therefore, as described above, in the stage of assembling the first lens frame 35 by rotating the lead screw 41, the shielding cylinder 25 is performed while adjusting the position so that the center position thereof is the center position of the cylindrical portion 35a. Become. The shielding cylinder 25 is also restricted from moving in the direction orthogonal to the optical axis by fitting the cylindrical portion 35a.

  As can be seen from this, in the case of the present embodiment, the shielding cylinder 25 is not integrally formed with the rectilinear cylinder 16 directly or indirectly. However, if integrated, the integrated component must be manufactured in consideration of the relationship between the position and shape of the shielding cylinder and the shape and dimensions of the other parts. The entire component is required to be manufactured with high accuracy, and the cost becomes extremely high. However, in the case of the present embodiment, the number of parts is increased by one. However, as long as the fitting tolerance between the shielding cylinder 25 and the cylindrical portion 35a can be obtained with high accuracy, the two can be suitably assembled. Therefore, the overall cost can be suppressed. Further, such a configuration has the effect of variations in the outer shape of the first lens frame 35 itself, the connection relationship between the tip of the arm portion 35b and the key groove 16w of the rectilinear cylinder 16, the hole of the overhang portion 35d and the guide pin. 38, even if the arrangement position of the cylindrical portion 35a in the rectilinear cylinder 16 is not obtained in accordance with the design standard due to the influence of the connection relationship with the shielding cylinder 25, the shielding cylinder 25 The cylindrical portion 35a can be suitably fitted.

  In this way, the posture of the lead screw 41 is also stable when the first lens frame 35 is assembled. That is, as described above, before the first lens frame 35 is assembled, the lead screw 41 is in a state in which the lead screw 41 may slightly wobble with the fitting portion between the shaft portion 41a and the hole 16r as a fulcrum. It was. However, in a state where the first lens frame 35 is assembled, the columnar portion 41d is in a state of being supported by the hole 35i of the cylindrical portion 35h, so that an extremely stable arrangement state can be maintained. Further, in the case of a normal lead screw, at least two places are supported by a fixing member. In the case of this embodiment, one place is provided for the straight cylinder 16 corresponding to such a fixing member. The other part is supported by the first lens frame 35 that is movable with respect to the rectilinear cylinder 16, so that the relative assembling work between the lead screw 41 and the first lens frame 35 is performed. It is extremely easy and has a feature that a stable function between the two can be secured. Therefore, it is extremely advantageous in terms of cost.

  Finally, referring to FIG. 11 and FIG. 12, the attachment structure of the shutter cover plate 12 to the frame body 10 and the members attached to the shutter cover plate 12 will be described. As described above, in the present embodiment, the frame body 10 also serves as the shutter base plate. The shutter cover plate 12 constitutes a blade chamber between itself and the frame body 10, and as can be seen from FIG. 12, the relief portion 10 k (see FIG. 3 for the overall shape) formed on the frame body 10. An escape portion 12a having substantially the same shape is formed so as to overlap the escape portion 10k. Since the relief portions 10k and 12a are provided, the other end portion of the flexible printed wiring board FPC can be led out of the lens barrel from the slit 1a of the base member 1. .

  The shutter cover plate 12 has a photographing optical path opening 12b formed substantially at the center, a gourd-shaped hole 12c, a triangular rice ball-shaped hole 12d, and three circular shapes. Holes 12e, 12f, and 12g are formed, and the components in the blade chamber can be seen from the holes 12c and 12d. On the other hand, shafts 10f, 10g, and 10h are erected on the surface of the frame body 10 on the blade chamber side, and hook portions 10i and 10j are provided at two locations on the outer peripheral portion. The shutter cover plate 12 has its outer peripheral portion hooked to the hook portions 10i and 10j of the frame body 10, holes 12e and 12f are fitted to the shafts 10g and 10h of the frame body 10, and the holes 12g are described later. The screw 43 is inserted and screwed to the frame 10. Note that only a part of the shutter cover plate 12 having such a shape is shown in FIG. 1 and FIG. 2, and the attachment structure to the frame body 10 is also shown for convenience. The shutter cover plate 12 is also shown for convenience in FIGS. 13 to 15, and the opening on the right side of the second lens group 13 shows the opening 12 b, and the escape portion 12 a. It does not indicate. The escape portion 12a has the shape shown in FIG.

  Thus, as shown in FIG. 11, two light-shielding plates 44 and 45 having flexibility are attached to the shutter cover plate 12 attached to the frame 10. ing. One of the light shielding plates 44 has two small holes 44a and 44b and a large hole 44c. The hole 44b is fitted to the shaft 10h of the frame body 10, and the screw 44 is inserted into the hole 44a. By inserting 43, the shutter cover plate 12 and the frame 10 are screwed together. In the large hole 44c, a part of the protrusion formed on the base member 1 as a receiving portion of the screw 2 can be inserted in the state shown in FIG.

  The other light-shielding plate 45 is longer and arc-shaped than the light-shielding plate 44, and escapes from the hole 45a that is slightly larger than the gourd-shaped hole 12c and the tips of the hook portions 10i and 10j. 2 holes 45b, 45c, a large square hole 45d, and two circular holes 45e, 45f. Among them, the hole 45d is a hole for receiving the cam member 4 (see FIG. 2) attached to the base member 1 in the state of FIG. Then, the light shielding member 45 has a double-sided tape 46 affixed (adhered) from a position slightly below the hole 45a to an upper end position (a position on the left side of the hole 45e), as indicated by a broken line on the rear surface. The holes 45e and 45f are fitted to the shafts 10f and 10g, and then attached to the shutter cover plate 12 by the double-sided tape 46. In a state where the two light shielding plates 44 and 45 are attached to the shutter cover plate 12, the free ends of the two are superposed from opposite directions with the free end of the light shielding plate 45 facing the imaging device 3 side. Yes.

  Then, next, the specific structure of the flexible printed wiring board FPC in a present Example and the relationship between said light-shielding plates 44 and 45 are demonstrated. FIG. 14 is a sectional view showing the relationship between the flexible printed wiring board FPC and the light shielding plates 44 and 45 in an easy-to-understand manner when FIG. 2 is viewed from substantially below. As can be seen from FIG. The flexible printed wiring board FPC has four bent portions that are alternately bent at opposite intervals in a lens barrel, and can be folded at the bent portions. As is well known, an ordinary flexible printed wiring board FPC has three layers including a copper foil layer. On the other hand, the flexible printed wiring board FPC of the present embodiment has three layers in the four bent portions, but the other portions in the lens barrel have four layers and bends in the bent portions. It is easy to bend at other parts.

  For this reason, the flexible printed wiring board FPC has four flat portions with the bent portion as a boundary in the lens barrel, and the three flat portions except for the flat portion for attachment to the step motor 32 have three flat portions. It can be folded. On the other hand, the two light shielding plates 44 and 45 attached to the shutter cover plate 12 have flexibility as described above, and their free ends are overlapped so as to overlap. It faces the escape part 12a. Therefore, in the flexible printed wiring board FPC, the middle flat portion of the three foldable flat portions is always in contact with one of the free ends. In other words, the free ends of the two light shielding plates 44 and 45 are inserted into the folding surfaces on the different surface sides of the flexible printed wiring board FPC.

  Next, the operation of this embodiment will be described. FIGS. 1, 4 and 13 show the camera not in use. The first lens group 36 and the second lens group 13 are accommodated in a fixed cylinder 5 fixed to the camera body. Therefore, it is in a so-called retracted state. In this state, the three pins 16 c provided on the rectilinear cylinder 16 push the overhanging portion 14 a of the second lens frame 14 to which the second lens group 13 is attached against the urging force of the spring 15. As a result, the distance between the frame 10 and the second lens frame 14 is minimized, and a suitable fit within the fixed cylinder 5 is possible. At this time, the barrier connecting member 23 is brought into the state where the pin 23 b is closest to the optical axis by the cam member 4. Therefore, as shown in FIG. 4, the engaging portions 18a and 19a (see FIG. 6 for the reference numerals) of the barrier plates 18 and 19 are not in contact with the pin 23a of the barrier connecting member 23, and one barrier The plate 18 is biased clockwise by pushing one end of a spring (not shown) by the pin 23a, and the other barrier plate 19 is pushed counterclockwise by pushing one end of the spring (not shown) by the pin 23a. Both of them are brought into contact with the stopper 16i and cover the opening 16z. Further, as shown in FIG. 13, at this time, the flexible printed wiring board FPC is in a completely folded state, and the light shielding plate 45 is slightly bent toward the base member 1 side.

  When the camera is used and the power is turned on, the step motor (not shown) rotates to rotate the gear 7 (see FIG. 2) attached to the fixed cylinder 5. Therefore, while the rotary cylinder 8 is rotated and moved straight to the subject side, the key cylinder 9, the frame body 10, and the straight advance cylinder 16 are moved straight to the subject side without being rotated, and the first lens group 36 and the first lens group 36. The two lens group 13 is extended. At this time, the rotary cylinder 8 and the key cylinder 9 move to the subject side at the same speed, but the frame body 10 is faster than them as a whole, and the rectilinear cylinder 16 as a whole moves faster than the frame body 10. For this reason, the pin 16 c is separated from the frame body 10, whereby the distance between the frame body 10 and the second lens frame 14 is also increased by the biasing force of the spring 15. Then, as clearly shown in FIG. 2, finally, the hook portion 14d of the second lens frame 14 comes into contact with the frame body 10, the pin 16c of the rectilinear cylinder 16 is separated from the second lens frame 14, The distance between the first lens group 36 and the second lens group 13 is also increased.

  On the other hand, since the rectilinear cylinder 16 moves toward the subject, the pin 23 b of the barrier connecting member 23 moves away from the cam member 4. At that time, the barrier connecting member 23 is urged so as to rotate clockwise in FIG. 4 by a spring (not shown), so that the pin 23b is rotated at its tip by the cam surface (slope surface) of the cam member 4. ) And move away from the optical axis. Therefore, the other pin 23a provided on the barrier connecting member 23 loosens the tension of the respective springs hung on the barrier plates 18 and 19, and eventually comes into contact with the engaging portions 18a and 19a. Without loosening those tensions, the engaging portions 18a and 19a are pushed up, one barrier plate 18 is rotated counterclockwise, and the other barrier plate 19 is rotated clockwise. These rotations are stopped when the barrier plate 18 abuts against the stopper 16j after the opening 16z is fully opened. 5 and 6 show the state of being stopped in this manner. Immediately thereafter, a step motor (not shown) is stopped, and the operation of all members is stopped.

  In this way, the state where the feeding operation is completed is the initial state (photographing standby state) shown in FIGS. 2 and 14, and in this embodiment, in this initial state, The first lens group 36 and the second lens group 13) are ready for photographing at infinity (telephoto state). As can be seen from FIG. 14, at this time, the flexible printed wiring board FPC is unfolded from the folded state, the light shielding plate 44 is slightly bent toward the base member 1 side, and the light shielding plate 45 is greatly enlarged toward the base member 1 side. Is bent. From this state, when performing zooming when shooting, while looking through the zoom finder operated in conjunction with the shooting lens, the step motor (not shown) is rotated forward and backward to fix the fixed cylinder 5. Due to the shape of the cam grooves 5a, 8c, 8d formed in the rotary cylinder 8, the rectilinear cylinder 16 and the frame body 10 are simultaneously moved in the optical axis direction and the first lens group 36 and the second lens group 13 The relative positional relationship is also changed. FIG. 15 shows a case in which close-up photography is possible (wide state) by such zooming. At this time, the distance between the first lens group 36 and the second lens group 13 is greatly separated. The light shielding plate 44 is largely bent toward the subject side by the flexible printed wiring board FPC, but the light shielding plate 45 is not bent at all. Thus, in the case of the present embodiment, since both the light shielding plates 44 and 45 are bent by the flexible printed wiring board FPC, any operating state can be suitably obtained.

  Thereafter, when the release button is pressed at the time of shooting, first, focus adjustment is automatically performed, and subsequently, exposure for shooting with respect to the solid-state imaging device of the imaging device 3 is performed. Therefore, first, in order to perform the focus adjustment, the step motor 32 is rotated to change the relative position of the first lens group 36 with respect to the rectilinear barrel 16, thereby the first lens group 36 and the second lens group 13. The relative position of is changed. That is, when the step motor 32 rotates, the rotation is transmitted from the output gear 33 to the gear 42 via the gear 34, and the lead screw 41 is rotated. Therefore, the first lens frame 35 holding the nut member 40 is moved by a predetermined amount in any direction along the optical axis corresponding to the rotation direction of the lead screw 41.

  FIG. 10 shows the relative positional relationship between the rectilinear cylinder 16 and the first lens frame 35 when focus adjustment is performed. FIG. 10A shows the first lens frame 35 taking the most image. FIG. 10 (b) shows the case where the first lens frame 35 is closest to the subject side, particularly in the state shown in FIG. 10 (a). If the shielding cylinder 25 is not provided as in the present embodiment, a large gap is formed between the cover plate 20 and the cylindrical portion 35a of the first lens frame 35. For this reason, external dust that has entered through the opening 16z of the rectilinear cylinder 16 enters the opening 20b of the cover plate 20, and then enters the imaging device 3 side through the gap to capture the image of the first lens group 36. It will adhere to the surface of the device 3, adhere to both surfaces of the second lens group 13, or adhere to the front surface of the imaging device 3.

  In particular, since the dust reaching the front surface of the image pickup apparatus 3 is close to the image pickup surface, the dust is accumulated every time the image is taken. End up doing so. Moreover, the dust attached in such a manner cannot be easily cleaned by the user as in the case where it adheres to the subject side surface of the first lens group 36, and asks a specialty store to disassemble the camera. It must be done. Therefore, in the case of the present embodiment, by providing the shielding cylinder 25, the occurrence of such a situation is suppressed as much as possible, and the shielding cylinder 25 is not integrated with the cover plate 20, thereby As described above, the cost is not high, and the first lens frame 35 can be suitably assembled to the rectilinear cylinder 16.

  In this way, when the focus adjustment is completed, photographing by the imaging device 3 is performed. As is well known, in the case of this type of digital camera, the operation of the shutter blades is performed in one of two sequences. One is that the shutter blade is closed when the exposure opening is in the initial state of the shutter. At the time of shooting, the shutter blade is first fully opened and then the shooting is started normally. This is what is called a closed type. The other is a normally open type in which the shutter blades are in the initial state of the shutter when the exposure opening is fully open, and shooting is started immediately from that state. In the case of the present embodiment, as described above, since the zoom finder (optical finder) is provided, the case of operating in a normally closed type sequence often employed in such a configuration will be described. To do.

  When the focus adjustment as described above is performed, or when the focus adjustment as described above is completed, the shutter blades that are not specified are opened by the driving unit 11 and the opening portion of the shutter cover plate 12 is opened. 12b is opened, and from this point on, the solid-state imaging device of the imaging device 3 is exposed to the subject light passing through the first lens group 36 and the second lens group 13, and electric charges are accumulated. When the shutter blades are fully opened, the charge that has been accumulated in the solid-state imaging device is released, and the accumulation of charges for photographing is started. Thereafter, when a predetermined time elapses, the shutter blade is closed by the driving means 11 according to a signal from the exposure time control circuit. And as soon as the shutter blade closes and stops the opening 12b, the imaging information is transferred from the solid-state image sensor to the storage device. At the time of the transfer, when a predetermined amount or more of light hits the solid-state image sensor, As is well known, a smear phenomenon occurs, and a high-quality image cannot be obtained.

  By the way, in the configuration as in the present embodiment, when photographing in the telephoto state (tele state), as can be seen from FIG. 2, the first lens frame 35 to which the first lens group 36 is attached, Since the second lens frame 14 to which the lens group 13 is attached is close and the shutter blades are closed at the time of transfer, the light passing through the first lens group 36 passes through the second lens frame 14. Even if it detours to reach the imaging device 3, the amount of light is very small. Therefore, no harmful smear phenomenon occurs.

  However, in the close-up photographing state (wide state) as shown in FIG. 15, the shutter blades are closed because the first lens frame 35 and the second lens frame 14 are far apart. However, the light that has passed through the first lens group 36 passes through the escape portion 10k (see FIG. 3) of the frame body 10 to which the second lens frame 14 is attached and the escape portion 12a of the shutter cover plate 12, and is considerably This amount of light reaches the imaging device 3 and causes a harmful smear phenomenon. However, in the case of the present embodiment, the two light shielding plates 44 and 45 are attached to the shutter cover plate 12 so that the free ends thereof are overlapped with each other, which affects the arrangement of the flexible printed wiring board FPC. Moreover, most of the light that bypasses the second lens frame 14 does not reach the imaging device 3 by effectively covering the escape portions 10k and 12a. Therefore, no harmful smear phenomenon occurs.

  In this way, if the shooting is repeated and then no longer shooting, the camera power switch is turned off, but the delay circuit is still working even if it is turned off. The ON state continues for a predetermined time, and the step motor 32 and another step motor (not shown) are rotated by the OFF signal. First, when the power switch is turned off, the first lens group 36 may be in the state shown in FIG. Therefore, if the barrier plates 18 and 19 (not shown in FIG. 10B) are closed in this state and the closing operation of the opening 16z is performed, the barrier plates 18 and 19 are It will collide with the mask 37 of the first lens group 36. Therefore, in this embodiment, the step motor 32 is rotated to return the first lens frame 35 to the initial state shown in FIG. The sensor 26 detects the return state and stops the rotation of the step motor 32.

  On the other hand, when the other step motor (not shown) is rotated, the fixed cylinder 5 is rotated via the gear 7 in the reverse direction from the state shown in FIG. 1 to the state shown in FIG. Therefore, the rotary cylinder 8 is caused to advance straight toward the image pickup apparatus 3 while rotating, and the key cylinder 9 is caused to advance straight toward the image pickup apparatus 3 without rotating. Further, the frame 10 and the rectilinear cylinder 16 are also moved straight toward the image pickup apparatus 3 as a whole without rotating, and the first lens group 36 and the second lens group 13 are retracted. Since the rectilinear cylinder 16 operates faster as a whole than the frame body 10, the pin 16c of the rectilinear cylinder 16 comes into contact with the protruding portion 14a of the second lens frame 14, and the urging force of the spring 15 is pushed. Against this, the space | interval of the 2nd lens frame 14 and the frame 10 is made small.

  In parallel with this, the pin 23b of the barrier connecting member 23 comes into contact with the cam member 4 and is guided to the cam surface at the tip, so that the barrier connecting member 23 is subjected to a spring biasing force (not shown). On the contrary, it is rotated counterclockwise in FIG. Therefore, the pin 23a of the barrier connecting member 23 presses one end of two springs (not shown) hooked on the pin, and the other ends of the springs are hooked on the barrier plate 18 and the barrier plate 19, respectively. Therefore, the barrier plate 18 is rotated clockwise and the barrier plate 19 is rotated counterclockwise without tensioning those springs. Then, at the moment when the opening 16z is covered, the ends of the barrier plates 18 and 19 come into contact with the stopper 16i and stop. However, the barrier connecting member 23 is rotated slightly thereafter, and the pin 23a Is separated from the engaging portions 18a and 19a, and a spring (not shown) hung between the barrier plates 18 and 19 is tensioned. When the pin 23b is pressed down to the lower position of the cam member 4, a step motor (not shown) is stopped and the retracted state shown in FIGS.

  The present embodiment is an example when the present invention is applied to a retractable digital camera including a barrier plate and a zoom lens, but the present invention is not limited to such a configuration. That is, in the case of the present embodiment, the frame 10 has the second lens group 13 attached in addition to the shutter device, and can be reciprocated by the rotary cylinder 8 within the fixed cylinder 5. The invention is not limited to such a configuration, for example, a lens barrel having a configuration in which the frame body 10 is not attached with the second lens group 13 and is integrated with the fixed cylinder 5 or the base member 1. It doesn't matter. In the case of the present embodiment, the light shielding plates 44 and 45 are attached to the shutter cover plate 12. However, even if the second lens group 13 is not attached or is attached, the present embodiment. If the attachment method is different from the above, the frame body 10 may be attached. Further, when the shutter base plate is not shared by the frame body 10 as in the present embodiment, it may be attached to the shutter base plate. Further, in the present embodiment, the two light shielding plates 44 and 45 are provided, but only one of them may be provided.

It is sectional drawing of the Example in the non-use state (collapsed state of a photographic lens) of a camera. It is sectional drawing which shows the state (tele state) which extended the photographic lens from the position of FIG. 1 to the position which can use a camera. It is the top view which looked at the frame 10 shown by FIG.1 and FIG.2 from the to-be-photographed object side. It is the top view which looked at the inside of a straight advance cylinder from the imaging device side in the state of FIG. FIG. 3 is a plan view of the barrier mechanism in the straight cylinder in the state of FIG. 2 as viewed from the imaging device side. It is the top view which removed and showed the cover plate of the barrier chamber in FIG. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is CC sectional view taken on the line in FIG. FIG. 10A is a cross-sectional view showing a moving state of the first lens group with respect to the rectilinear cylinder, and FIG. 10A shows a state in which the first lens group is in the right limit position with respect to the rectilinear cylinder. b) shows the state in the left limit position. It is the top view which looked at the inside of the lens barrel shown by FIG.1 and FIG.2 from the imaging device 3 side. It is the top view which removed and showed two light-shielding plates from FIG. It is sectional drawing seen from the substantially downward direction of FIG. It is sectional drawing seen from the substantially downward direction of FIG. It is sectional drawing which showed the photographic lens from the tele state of FIG. 14 to the wide state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base member 1a Slit 2,28,29,30,43 Screw 3 Imaging device 4 Cam member 5 Fixed cylinder 5a, 8c, 8d Cam groove 5b, 9c, 9d, 16w Key groove 5c, 5d, 14a, 35d Overhang | projection part 6, 31 Motor mounting plate 6a, 16d, 16e, 16f, 10f, 10g, 10h Shaft 7, 34, 42 Gear 8 Rotating cylinder 8a Partial gear 8b, 10b, 16a, 16c, 16u, 23a, 23b, 27a Pin 8e, 10e Groove 9 Key cylinder 9a, 14d, 20f, 20g, 10i, 10j Hook part 9b Key 10 Frame body 10a, 35b Arm part 10c, 38 Guide pin 10d, 12c, 12d, 12e, 12f, 14b, 16r, 16y, 20d , 20e, 20h, 31a, 35i, 35m, 44a, 44b, 44c, 45a, 45b, 45c, 45d 45e, 45f Holes 10k, 12a Escape part 11 Driving means 12 Shutter cover plate 12b, 16z, 20b Opening part 13 Second lens group 14 Second lens frame 14c, 35a, 35h Cylindrical part 14e, 20j, 35g Spring hook part 15 , 39 Spring 16 Linear cylinder 16b, 35k Wall 16g, 16h Receiving portion 16i, 16j Stopper 16k, 16m, 16n Mounting portion 16p, 16q, 16r Bearing hole 16s, 16t Recessed portion 16v Hooking portion 16x Locking portion 17 Cosmetic member 18, DESCRIPTION OF SYMBOLS 19 Barrier plate 18a, 19a Engagement part 19b Bending part 20 Barrier cover board 20a, 20i, 35e, 35f Bending part 20c Long hole 21,22 Spring shaft member 23 Barrier connection member 24 Stopping member 25 Shielding cylinder 25a, 25b Protrusion Part 26 Sensor 27 Sensor mounting plate 32 Step motor 32a Terminal pin 33 Output gear 35 First lens frame 35c Shading part 35j Inserted part 36 First lens group 37 Mask 40 Nut member 41 Lead screw 41a Shaft part 41b Slot 41c Male thread 41d Cylindrical part 44, 45 Shading plate 46 Both sides Tape FPC Flexible printed circuit board

Claims (3)

  A second lens which is disposed inside a first cylinder integral with the camera body and reciprocates along the optical axis together with the first lens group in accordance with the rotation direction of the first motor, and enters and exits the subject side from the first cylinder. A cylinder, a second motor fixed to the second cylinder and reciprocating the first lens group along the optical axis on the second cylinder during focus adjustment, and one end connected to the second motor A foldable flexible printed wiring board having a plurality of bent portions that are alternately bent at predetermined intervals between the other end on the camera body side and a shutter device are attached to the first. A frame which is disposed inside the cylinder and forms a relief portion for inserting the flexible printed wiring board from the second motor side to the camera body side; and is attached to the frame body or the shutter device. Its flexibility A camera lens barrel, characterized in that it comprises a and a light shielding plate that is inserted between the free ends to face the said relief portion folded mating surface of the flexible printed wiring board.   In addition to the light-shielding plate, another light-shielding plate is provided, and the free ends of the light-shielding plates face the escape portion so as to overlap from opposite directions, respectively. The camera lens barrel according to claim 1, wherein the lens barrel is inserted between folding surfaces on different surfaces.   In addition to the shutter device, the frame has a second lens group attached thereto, and is disposed so as to be movable along the optical axis in the first cylinder. The first motor allows the first lens group to be moved. The camera lens barrel according to claim 1, wherein the distance between the camera lens barrel and the camera lens barrel is variable.