JP2009244613A - Collapsible lens barrel for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collapsible zoom lens barrel for a camera that has a reduced overall dimension in an optical axis direction when collapsed by adopting a devised structure of a plurality of tube members for moving each lens group in the optical axis direction. <P>SOLUTION: When rotated by a motor, a first rotating tube 6 is also moved in an optical axis direction together with a first key tube 8. When rotated by the first rotating tube 6, a second rotating tube 9 is also moved in the optical axis direction together with a second key tube 11. The first rotating tube 6 includes cam grooves 6d that are engaged with follower pins 23a of a frame member 13 mounted with a second lens group 24 to move the frame member 13 in the optical axis direction. The second rotating tube 9 includes cam grooves 9b that are engaged with follower pins 12a of a straight advance tube 12 indirectly mounted with a first lens group 18 to move the straight advance tube 12 in the optical axis direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a retractable camera lens barrel provided with a zoom lens.

  In Patent Document 1 below, the first motor is rotated to change the relative distance between the first lens group and the second lens group to perform zooming, and the cylinder in which the first lens group is accommodated. A lens lens for a camera that adjusts the focus by moving a lens frame holding the first lens group in the optical axis direction with respect to the cylindrical member by rotating a second motor attached to the member. When the camera is no longer used, the first motor is rotated so that all the lens groups are housed in a fixed cylinder integrated with the camera body so as to be in a retracted state. A camera lens barrel is described.

  Further, in Patent Document 2 below, zooming is performed by changing the relative distance between the first lens group and the second lens group by rotating the first motor, and in the lens barrel. A camera lens barrel that adjusts the focus by moving the lens frame holding the third lens group in the optical axis direction by rotating a second motor attached to the base member of the lens barrel. When the camera is no longer used, the first motor is rotated so that all the lens groups are housed in a fixed cylinder integrated with the camera body so as to be in a retracted state. A lens barrel is described.

  In any of these lens barrels, a rotating cylinder (a cam cylinder in Patent Document 2) is arranged inside the fixed cylinder, and the plurality of follower pins are connected to a plurality of cams of the fixed cylinder. It is engaged with the groove. Therefore, when the rotating cylinder is rotated by the first motor, the follower pin is guided in the cam groove of the fixed cylinder, so that the rotating cylinder is also moved in the optical axis direction. In addition, a plurality of cam grooves of two types are formed in the rotating cylinder, and a plurality of follower pins of a member to which the first lens group is attached are associated with one type of cam grooves. In addition, a plurality of follower pins of a member to which the second lens group is attached are engaged with the plurality of cam grooves of the other type. For this reason, when the rotary cylinder moves in the optical axis direction while rotating, the first lens group and the second lens group are moved in the optical axis direction, and the relative distance is also changed to perform zooming. ing.

JP 2006-30291 A JP 2006-17903 A

  By the way, since recent cameras have been made very thin, in the case of a retractable lens barrel, a plurality of cylindrical members constituting the barrel can be suitably accommodated in the camera body. Therefore, it is required to make the dimension in the optical axis direction as small as possible. However, in the case of the rotating cylinder as described above, it is necessary to arrange two types of cam grooves along the optical axis, as can be seen from the rotating cylinder (cam cylinder 30) shown in FIG. Because there is, can not be reduced by any means. For this reason, even if the other cylindrical members can be reduced to some extent, there is a problem that it is difficult for the entire lens barrel to cope with the thinning of the camera.

  The present invention has been made in order to solve such problems, and an object of the present invention is to provide a collapsible camera lens mirror in which zooming is performed by the first lens group and the second lens group. A retractable camera that can reduce the overall size in the optical axis direction when retracted by forming two types of cam grooves, which were conventionally formed in the same rotating cylinder, in separate rotating cylinders. A lens barrel is provided.

  In order to achieve the above object, a retractable camera lens barrel of the present invention has a plurality of cam grooves and is integrated with a camera body, a plurality of cam grooves, And a plurality of follower pins engaged with a plurality of cam grooves of the first cylinder member, which are arranged inside the first cylinder member and moved in the optical axis direction when rotated by the driving means. A second cylindrical member, a third cylindrical member having a plurality of cam grooves, disposed inside the second cylindrical member, and moved only in the optical axis direction by rotation of the second cylindrical member; A plurality of cam grooves and a plurality of follower pins engaged with the plurality of cam grooves of the third cylinder member are disposed inside the third cylinder member and rotated by the second cylinder member. A fourth cylindrical member that is also moved in the optical axis direction, and the fourth A fifth cylindrical member disposed inside the member and moved only in the optical axis direction by rotation of the fourth cylindrical member; a first lens group; and a plurality of cam grooves in the fourth cylindrical member A sixth lens member having a plurality of engaged follower pins and disposed inside the fifth tube member and being moved only in the optical axis direction by rotation of the fourth tube member; and a second lens A frame member having a plurality of follower pins engaged with the plurality of cam grooves of the second cylinder member and being moved only in the optical axis direction by rotation of the second cylinder member; , To be equipped with.

  In order to achieve the above object, the retractable camera lens barrel of the present invention more specifically has a plurality of cam grooves and a plurality of key grooves, and the camera body has a plurality of cam grooves. A plurality of cam grooves, a plurality of key grooves, and a plurality of follower pins engaged with the plurality of cam grooves of the first cylinder member, A second cylindrical member disposed inside the first cylindrical member and moved in the optical axis direction when rotated by the driving means; a plurality of cam grooves; a plurality of first key grooves; A second key groove, and a plurality of keys engaged with the key groove of the first cylinder member, disposed inside the second cylinder member, and by rotation of the second cylinder member A third cylindrical member that is moved only in the optical axis direction; a plurality of cam grooves; and a plurality of cam grooves in the third cylindrical member; A plurality of follower pins engaged with both of the plurality of key grooves of the second cylinder member, disposed inside the third cylinder member, and rotated by the second cylinder member A fourth cylinder member that is also moved in the direction of the optical axis; a plurality of key grooves; and a plurality of keys engaged with a plurality of first keys of the third cylinder member; A fifth cylindrical member disposed inside the member and moved only in the optical axis direction by rotation of the fourth cylindrical member; a plurality of keys of the fifth cylindrical member attached to the first lens group A plurality of follower pins engaged with both the groove and the plurality of cam grooves of the fourth cylinder member, and disposed on the inner side of the fifth cylinder member, and by rotation of the fourth cylinder member A sixth cylindrical member that can be moved only in the direction of the optical axis; and a second lens group And having a plurality of follower pins engaged with both the plurality of second key grooves of the third cylinder member and the plurality of cam grooves of the second cylinder member, the inner side of the third cylinder member And a frame member that is moved only in the direction of the optical axis by the rotation of the second cylindrical member.

  In that case, the fourth cylinder member is composed of an outer cylinder member and an inner cylinder member that are integrally assembled with each other, and the outer cylinder member includes the plurality of cam grooves of the third cylinder member and the The plurality of follower pins engaged with both of the plurality of key grooves of the second cylinder member are provided, and the plurality of inner cylinder members are engaged with the plurality of follower pins of the sixth cylinder member. The plurality of cam grooves of the inner cylinder member are formed as through grooves having an inner wall surface orthogonal to the optical axis, and the plurality of follower pins of the sixth cylinder member are cylindrical. If it is made to do, it will become a structure strong against an impact. Further, when the sixth cylindrical member and the frame member are urged in opposite directions on the optical axis by at least one spring member, the mutual interval between the two lens groups can be stably obtained. .

  In order to perform focus adjustment, a motor is attached to the sixth cylindrical member, and the first lens group is moved in the optical axis direction with respect to the sixth cylindrical member by the motor. The third lens group may be arranged so as to be movable in the optical axis direction by a motor in the first cylindrical member.

  The present invention relates to a collapsible camera lens barrel in which zooming is performed by relatively changing a distance between a first lens group and a second lens group, and a member to which the first lens group is attached is an optical axis. The cam groove for moving in the direction and the cam groove for moving the member to which the second lens group is attached in the optical axis direction are formed in separate cylindrical members that can be moved in the optical axis direction while rotating. Thus, there is an advantage that the overall dimension in the optical axis direction when retracted can be reduced.

  Embodiments of the present invention will be described with reference to the illustrated examples. The retractable camera lens barrel of the present invention can be used for both a camera using a silver salt film and a digital camera, but the embodiment is configured to be used for a digital camera. Is. FIG. 1 is a cross-sectional view showing a retracted state (the camera is not used), and FIG. 2 is a cross-sectional view showing a state where the two lens groups are at the wide-angle end photographing position. 3 is a cross-sectional view showing a state where the two lens groups are at the telephoto end photographing position. 4 and 5 are views of a plurality of cylindrical members constituting the embodiment as viewed from the inside. FIG. 4 (a) is a fixed cylinder, and FIG. 4 (b) is a first view. 4 (c) shows the first key cylinder, FIG. 5 (a) shows the second rotary cylinder, FIG. 5 (b) shows the second key cylinder, and FIG. 5 (c) shows the straight cylinder. It is a thing. Note that the cross-sectional views of FIGS. 1 to 3 are not shown by cutting the exact same part, but are shown cut at different parts for convenience in order to facilitate understanding of the overall configuration with a small number of drawings. It is a thing. 4 and 5, the right side is the imaging device side, and the left side is the subject side.

  The present embodiment is a collapsible lens barrel of the type in which the first lens group also serves as a focus adjusting lens, as described in Patent Document 1. First, the configuration of this embodiment will be described. The base member 1 shown in FIGS. 1 to 3 is a member that is directly attached to the camera body, and the imaging device 2 is attached to a substantially central portion thereof. As is well known, the imaging device 2 includes a solid-state imaging device such as a CCD, and a filter plate such as a low-pass filter, a transparent cover plate, and the like are disposed on the subject side. Further, a fixed cylinder 3 is integrally attached to the base member 1 by means not shown, and a sensor 4 shown in FIG. 1 is attached to the base member 1 inside thereof. As can be seen from FIG. 1, the sensor 4 is a photo interrupter.

  As shown in FIG. 3, a protruding portion 3 a is provided outside the fixed cylinder 3, and the gear 5 is rotatably attached by the protruding portion 3 a and the base member 1. The gear 5 is inserted with teeth formed on the outer periphery thereof through a long hole of the fixed cylinder 3 formed parallel to the optical axis. Although not shown, a motor is attached to the base member 1 outside the fixed cylinder 3, and the gear 5 is reciprocally rotated by the motor via a reduction gear. As described above, in the case of the present embodiment, the fixed cylinder 3 is unitized together with the motor, the base member 1 and the like. However, the present invention is not limited to such a configuration. May be attached to a member on the camera body side, or the base member 1 may be a member on the camera body side.

  As shown in FIG. 4 (a), as is well known, the fixed cylinder 3 is rotated by a motor (not shown) by a first rotating cylinder 6 (described later) at angular positions at equal intervals. In order to make it possible to move in the optical axis direction as well, three cam grooves 3b having the same shape are formed as through grooves. Further, when the first rotary cylinder 6 (described later) moves in the optical axis direction while rotating on the inner peripheral surface of the fixed cylinder 3, the first key cylinder 8 (described later) moves in the optical axis direction with the first rotary cylinder 6. In order to move only together, the three key grooves 3c parallel to the optical axis are formed as bottomed grooves not penetrating at angular positions that do not interfere with the cam grooves 3b.

  A first rotating cylinder 6 made of synthetic resin is disposed inside the fixed cylinder 3. As can be seen from FIG. 3, the first rotating cylinder 6 has a spur partial gear 6a at the end on the imaging device 2 side over a predetermined angle range. 5 is engaged. Further, as shown in FIG. 4 (b), three follower pins 6b are provided on the outer peripheral surface of the first rotating cylinder 6 at equally spaced angular positions, and as can be seen from FIG. The cam groove 3 b of the fixed cylinder 3 is engaged. Therefore, when the first rotating cylinder 6 is rotated by the motor (not shown) via the gear 5, it is guided by the cam groove 3b of the fixed cylinder 3 so as to move in the optical axis direction. It has become.

  Further, although not shown in FIG. 4B, the first rotating cylinder 6 is provided with a light shielding piece 6c at the end on the imaging device 2 side as shown in FIG. Thus, the sensor 4 can detect that the first rotating cylinder 6 is in the state shown in FIG. 1 (collapsed state). Further, as shown in FIG. 4B, the first rotating cylinder 6 has three cam grooves 6d, three key grooves 6e, and three guide grooves 6f at equal angular positions. Are formed as bottomed grooves, and a thin portion 6g thinner than other regions is formed along the edge on the subject side (left side in the figure). As shown in FIGS. 1 to 3, a decorative ring 7 is attached to the first rotating cylinder 6 at the end on the subject side.

  A first key cylinder 8 is disposed inside the first rotating cylinder 6. As shown in FIG. 4 (c), the first key cylinder 8 has three cam grooves 8a and three two types of key grooves 8b and 8c, respectively, at equal angular positions. ing. Among them, the cam groove 8a and the key groove 8c are through grooves, but the key groove 8b is a bottomed groove. Further, three keys 8d are formed at equally spaced angular positions on the end of the first key cylinder 8 on the imaging device 2 side (right side in the figure), and equally spaced angles are formed on the subject side end. Three hook portions 8e are formed at the positions.

  Then, the first key cylinder 8 is inserted into the thin portion 6g by guiding the hook portion 8e from the imaging device 2 side to the guide groove 6f of the first rotation tube 6 with respect to the first rotation tube 6. It is assembled by rotating. The key 8d is engaged with the key groove 3c of the fixed cylinder 3 as can be seen from FIGS. For this reason, the first key cylinder 8 can be moved together with the first rotating cylinder 6 in the optical axis direction, but is not rotated. After assembly, the first rotary cylinder 6 is rotated with respect to the first key cylinder 8 within a predetermined angular range, but the hook portion 8e is outside the angular range and the guide groove 6f. Does not coincide with the position of the hook portion 8e.

  A second rotating cylinder 9 made of synthetic resin is disposed inside the first key cylinder 8. As shown in FIG. 5A, the second rotating cylinder 9 has three follower pins 9a at equiangular intervals on the outer peripheral surface. The follower pins 9a can be seen from FIG. Thus, the cam groove 8 a of the first key cylinder 8 is penetrated and engaged with the key groove 6 e of the first rotary cylinder 6. For this reason, the second rotating cylinder 9 is rotated together with the rotation of the first rotating cylinder 6. However, the second rotating cylinder 9 is independently moved by the cam groove 8a of the first key cylinder 8 in the optical axis direction. It is supposed to be.

  As shown in FIG. 5 (a), the second rotating cylinder 9 is formed with three cam grooves 9b and three guide grooves 9c connected to them at equal angular positions. In addition, a thin portion 9d thinner than other regions is formed along the edge on the subject side. The cam groove 9b and the guide groove 9c are both bottomed grooves, but the cam groove 9b is formed deeper than the guide groove 9c. As shown in FIGS. 1 to 3, a decorative ring 10 is attached to the end of the second rotating cylinder 9 on the subject side.

  A second key cylinder 11 is disposed inside the second rotating cylinder 9. As shown in FIG. 5B, the second key cylinder 11 is formed with three key grooves 11a as through grooves at equal angular positions. Further, at the end of the second key cylinder 11 on the image pickup device 2 side, three keys 11b and three escape portions 11c grooves are formed at equally spaced angular positions, and at the subject side end at equal intervals. Three hook portions 11d are formed at the angular position.

  In the second key cylinder 11, the hook portion 11d is first inserted into the cam groove 9b of the second rotating cylinder 9 from the imaging device 2 side and guided to the guide groove 9c along the shape of the cam groove 9b. Subsequently, after being inserted into the thin portion 9d by being guided by the guide groove 9c, it is assembled by being rotated with respect to the second rotating cylinder 9. The key 11b is engaged with the key groove 8b of the first key cylinder 8 as can be seen from FIG. Therefore, the second key cylinder 11 can move with the second rotating cylinder 9 in the optical axis direction but cannot rotate. After the assembly, the second rotary cylinder 9 is rotated within a predetermined angle range with respect to the second key cylinder 11. At this time, the position of the guide groove 9c coincides with the position of the hook portion 8e. Until it does not rotate.

  A rectilinear cylinder 12 is disposed inside the second key cylinder 11. As shown in FIG. 5C, the straight cylinder 12 has three follower pins 12a at equiangular intervals on the outer peripheral surface, and is equiangular at the end on the imaging device 2 side. Three escape portions 12b are formed at the interval positions. As shown in FIG. 2, the follower pin 12 a is engaged with the key groove 11 a of the second key cylinder 11 and the cam groove 9 b of the second rotating cylinder 9. Therefore, when the second rotating cylinder 9 is rotated, the follower pin 12a is pushed by the cam groove 9b and the linear cylinder 12 is moved only in the optical axis direction. The other cylinder members described so far have a relatively simple cylindrical shape, whereas the straight cylinder 12 has a complicated shape as will be described later. Therefore, in FIG. 5C, the subject side is shown broken away.

  Then, the other structure of the rectilinear cylinder 12 and the structural member attached to the rectilinear cylinder 12 are demonstrated using FIGS. 1-3. First, the rectilinear cylinder 12 is made of synthetic resin, and has a wall portion 12c formed with an opening for a photographing optical path on the subject side. The subject portion of the wall portion 12c has a wall portion 12c for the photographing optical path. A front plate 13 having an opening is attached, and a barrier plate (not shown) is arranged between them. And the decorative ring 14 is attached so that the attachment part of the front board 13 may be covered. Further, a motor mounting plate 15 is attached to the wall 12c on the imaging device 2 side by means not shown, and a step is provided on the imaging device 2 side of the motor mounting plate 15. The motor is mounted and the gear mounted on the output shaft is disposed between the wall 12c and the motor mounting plate 15, but their configuration is not directly related to the present invention. Only a part of the motor mounting plate 15 is shown in FIGS.

  The lead screw 16 shown only in FIG. 3 has a male screw portion 16a as is well known. The lead screw 16 is rotatable with one end shaft portion fitted into the hole of the wall portion 12c and the other end shaft portion supported by a member (not shown) integral with the step motor. Is attached. A gear 17 is attached to the lead screw 16 and meshes with a gear (not shown) attached to the output shaft of the step motor. Therefore, the lead screw 16 is reciprocally rotated by the rotation of the step motor.

  The lens frame 19 to which the first lens group 18 is attached is fitted to the guide tube 20 attached to the wall portion 12c, and is shown in FIG. 3 and the attached portion 19a shown in FIG. Attached portion 19b. And the hole 19a is formed in the to-be-attached part 19a, and as FIG. 2 shows, the hole is fitted to the guide shaft 21 attached to the wall part 12c. In FIG. 2, only one attached portion 19a and one guide shaft 21 are shown, but in actuality, one another is provided. On the other hand, as shown in FIG. 3, the attached portion 19b holds the nut member 22 so as to be detachable. The female thread portion of the nut member 22 is screwed into the male thread portion 16 a of the lead screw 16. Therefore, when the lead screw 16 rotates, the lens frame 19 is guided by the guide tube 20 and the guide shaft 21 and moved in the optical axis direction.

  A frame member 23 is disposed inside the first key cylinder 8. The frame member 23 is attached with a lens frame 25 to which the second lens group 24 is attached and a shutter device. Among them, the shutter device is not shown in a specific configuration, but shutter blades and diaphragm blades are attached to the image pickup device 2 side of the frame member 23, and their driving means are attached to the subject side. The frame member 23 has three follower pins 23a at equiangular intervals on the outer peripheral surface. The follower pins 23a pass through the key grooves 8c of the first key cylinder 8 and perform the first rotation. The cam groove 6d of the cylinder 6 is engaged. Therefore, when the first rotary cylinder 6 rotates, the follower pin 23a is pushed by the cam groove 6d and the frame member 23 is moved only in the optical axis direction. The escape portion 11c of the second key cylinder 11 shown in FIG. 5B and the escape portion 12b of the rectilinear cylinder 12 shown in FIG. 5C are in the retracted state shown in FIG. In order to avoid interference with the follower pin 23a, it is formed.

  Then, two springs are stretched between the frame member 23 and the rectilinear cylinder 12 and urged to draw them together. 2 and 3 show these two springs 26 and 27, one of the springs 26 is hung between the frame member 23 and the spring hooking portion 12 d provided on the rectilinear cylinder 12. The other spring 27 is hung between the motor mounting plate 15. Since the springs 26 and 27 are provided so that the distance between the first lens group 18 and the second lens group 24 can be stably obtained, the springs 26 and 27 are attached in directions opposite to each other on the optical axis. As long as it is energized, it is not limited to the tension spring as in this embodiment, and may be replaced with a compression spring. In such a case, it is preferable to use one large compression spring wound around the optical axis.

  Next, the operation of this embodiment will be described. As described above, the present embodiment is a retractable lens barrel having a zoom function in which the first lens group arranged closest to the subject is moved during focus adjustment. When the camera is not used, as shown in FIG. 1, the two rotary cylinders 6, 9, the two key cylinders 8, 11, and the rectilinear cylinder 12 are arranged on the imaging device 2 side. Is retracted into the fixed cylinder 3 and is in a retracted state. In the retracted state, a plurality of barrier plates (not shown) disposed between the wall portion 12 c of the rectilinear cylinder 12 and the front plate 13 cover the front surface of the first lens group 18.

  When the camera is turned on in such a retracted state, a motor (not shown) rotates to rotate the gear 5 shown in FIG. For this reason, the first rotating cylinder 6 is rotated, but the follower pin 6b is guided by the cam groove 3b of the fixed cylinder 3, and is therefore moved to the subject side. As a result, the first key cylinder 8 has its hook portion 8e pushed by the first rotating cylinder 6 and advances straight to the subject side, and the second rotating cylinder 9 is rotated by the follower pin 9a being pushed by the key groove 6e. However, since the follower pin 9a is guided in the cam groove 8a of the first key cylinder 8 in the second rotating cylinder 9, it is faster than the first rotating cylinder 6 and the first key cylinder 8 and moves toward the subject side. Is also moved. At this time, the frame member 23 is also moved straight toward the subject side by the follower pin 23a being guided by the cam groove 6d of the first rotating cylinder 6.

  When the second rotary cylinder 9 moves to the subject side while rotating, the second key cylinder 11 is also pushed straight by the hook portion 11d toward the subject side. However, the follower pin 12a of the straight advance cylinder 12 is rotated second. Since it is guided by the cam groove 9 b of the cylinder 9, it is made to advance straight to the subject side faster than the second rotating cylinder 9 and the second key cylinder 11. Further, in the process in which the first lens group 18 attached to the rectilinear cylinder 12 and the second lens group 24 attached to the frame member 23 are extended in this way, a plurality of the above-mentioned not shown The barrier plate opens and moves away from the front surface of the first lens group 18. Then, the state in which such a feeding operation is completed is the initial state (shooting standby state) shown in FIG. 2, and in the case of the present embodiment, this initial state is a state in which shooting is possible at the wide-angle end. .

  When the photographer does not wish to take pictures in this state after the feeding operation is completed in this way, the first rotary cylinder 6 is rotated forward and backward by a motor (not shown) while looking at the viewfinder, and the straight cylinder 12 And the frame member 23 are moved in the optical axis direction to perform zooming, and the relative positional relationship between the first lens group 18 and the second lens group 24 is changed. FIG. 3 shows an image-capable state at the telephoto end as an example of such a selection. When the release button is pressed after the angle of view of the desired magnification is determined in this way, first, focus adjustment is automatically performed, and then imaging by the imaging device 42 is performed.

  In the case of the present embodiment, the focus adjustment is performed by rotating a step motor (not shown) attached to the motor attachment plate 15. That is, when a step motor (not shown) rotates, the rotation is transmitted from a gear (not shown) attached to the output shaft to the gear 17 to rotate the lead screw 16. As a result, the nut member 22 is moved in the axial direction of the lead screw 16, so that the lens frame 19 is moved while being guided by the guide shaft 21 in a direction corresponding to the rotational direction of the lead screw 16. It can be stopped by. However, in the present invention, as described in Patent Document 2, the focus may be adjusted by the third lens group.

  In this way, when shooting is repeated and there is no longer any intention to shoot, the camera power switch is turned off, but even in such a case, the delay circuit is working and only for a predetermined time. The ON state continues, and a motor (not shown) can be rotated. Therefore, when the power switch is turned off, the motor rotates the first rotating cylinder 6 so that the cylinder members 6, 8, 9, 11, 12 and the frame member 23 are temporarily brought into the state shown in FIG. The operation is reverse to the above-described feeding operation. Along with this, a barrier plate (not shown) is closed. The operation is stopped when the sensor 4 detects the light shielding piece 6 c of the first rotating cylinder 6. This state is the retracted state shown in FIG.

  In the case of this embodiment, the cam groove 9b formed in the second rotating cylinder 9 is formed as a bottomed groove that does not penetrate. The reason is that, as can be seen from FIG. 2, the cam groove 9b is exposed to the outside when formed as a through groove. Therefore, in the case of the present embodiment, since the second rotary cylinder 9 is made of synthetic resin, the inner wall surface of the cam groove 9b with which the follower pin 12a is slidably contacted can be processed into a surface orthogonal to the optical axis. It cannot be formed as a slope. Accordingly, the follower pin 12a is also formed into a truncated cone. However, such a configuration may not be preferable.

  That is, if the camera equipped with the lens barrel of the present embodiment is dropped while being carried or dropped from a tabletop or the like, a large impact may be applied to the constituent members of the lens barrel in the optical axis direction. In particular, when the lens group is pulled out from the retracted state and carried with the front plate 13 attached to the rectilinear cylinder 12 against another object, the imaging device 2 can be compared with the rectilinear cylinder 12. This is because a strong force is applied to the side, and the straight cylinder 12 is tilted by the force, and the follower pin 12a may be disengaged from the cam groove 9b.

  In order to prevent such a phenomenon from occurring, the second rotating cylinder 9 of this embodiment is manufactured as two members of an outer cylinder and an inner cylinder, and a follower pin 9a is provided on the outer cylinder, Is formed with a cam groove 9b, and these cylinder members may be integrally fitted during assembly. By doing so, the cam groove 9b is not exposed by the outer cylinder, and at the stage of manufacturing the inner cylinder, the cam groove 9b is formed as a through groove, and the inner wall surface is processed into a surface perpendicular to the optical axis. can do. If the follower pin 12a of the rectilinear cylinder 12 that is in sliding contact with the cam groove 9b is formed in a cylindrical shape, the follower pin 12a will not come off the cam groove 9b even if the above strong force is applied. Accordingly, the present invention is also included in the present invention.

It is sectional drawing of the Example which showed the collapsed state (non-use state of a camera). It is sectional drawing of the Example which showed the state when two lens groups exist in a wide-angle end imaging position. It is sectional drawing of the Example which showed the state when two lens groups exist in a telephoto end imaging position. FIG. 4A is a view of the cylinder member of the embodiment developed from the inside, FIG. 4A is a fixed cylinder, FIG. 4B is a first rotating cylinder, and FIG. 4C is a first key cylinder. It is shown. FIG. 5A is a view of the cylinder member of the embodiment developed and viewed from the inside. FIG. 5A shows a second rotating cylinder, FIG. 5B shows a second key cylinder, and FIG. 5C shows a straight cylinder. It is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base member 2 Imaging device 3 Fixed cylinder 3a Overhang | projection part 3b, 6d, 8a, 9b Cam groove 3c, 6e, 8b, 8c, 11a Key groove 4 Sensor 5, 17 Gear 6 1st rotation cylinder 6a Partial gear 6b, 9a , 12a, 23a Follower pin 6c Light-shielding piece 6f, 9c Guide groove 6g, 9d Thin portion 7, 10, 14 Decorative ring 8 First key cylinder 8d, 11b Key 8e, 11d Hook part 9 Second rotary cylinder 11 Second key cylinder 11c, 12b Escape portion 12 Linear cylinder 12c Wall portion 12d Spring hook portion 13 Front plate 15 Motor mounting plate 16 Lead screw 16a Male screw portion 18 First lens group 19, 25 Lens frame 19a, 19b Mounted portion 20 Guide tube 21 Guide shaft 22 Nut member 23 Frame member 24 Second lens group 26, 27 Spring

Claims (6)

  A first cylinder member having a plurality of cam grooves and integrated with the camera body; a plurality of cam grooves; and a plurality of follower pins engaged with the plurality of cam grooves of the first cylinder member. A second cylindrical member disposed inside the first cylindrical member and moved in the optical axis direction when rotated by a driving means; and a plurality of cam grooves, and the second cylindrical member A third cylinder member disposed on the inside and moved only in the optical axis direction by rotation of the second cylinder member; a plurality of cam grooves; and a plurality of cam grooves engaged with the plurality of cam grooves of the third cylinder member A fourth cylinder member that has a follower pin and is disposed inside the third cylinder member and is also moved in the optical axis direction when rotated by the second cylinder member; and an inner side of the fourth cylinder member Arranged in the direction of the optical axis by the rotation of the fourth cylindrical member A fifth cylinder member to be moved and a plurality of follower pins which are attached to the first lens group and engaged with a plurality of cam grooves of the fourth cylinder member, And a sixth cylinder member which is moved only in the optical axis direction by rotation of the fourth cylinder member, and a second lens group is attached and engaged with a plurality of cam grooves of the second cylinder member. And a frame member that has a plurality of follower pins and is moved only in the direction of the optical axis by the rotation of the second cylindrical member. A first cylinder member having a plurality of cam grooves and a plurality of key grooves, and integrated with the camera body;
A plurality of cam grooves, a plurality of key grooves, and a plurality of follower pins engaged with the plurality of cam grooves of the first cylinder member, and disposed inside the first cylinder member; A second cylinder member that is also moved in the direction of the optical axis when rotated by the driving means;
A plurality of cam grooves, a plurality of first key grooves, a plurality of second key grooves, and a plurality of keys engaged with the key grooves of the first cylinder member; A third cylinder member that is disposed only in the optical axis direction by rotation of the second cylinder member;
A plurality of cam grooves, and a plurality of follower pins engaged with both the plurality of cam grooves of the third cylinder member and the plurality of key grooves of the second cylinder member, A fourth cylinder member disposed on the inside and moved in the optical axis direction when rotated by the second cylinder member;
A plurality of key grooves, and a plurality of keys engaged with a plurality of first keys of the third cylinder member, and disposed inside the fourth cylinder member; A fifth cylindrical member that is moved only in the optical axis direction by rotation of
The first lens group is mounted, and has a plurality of follower pins engaged with both the plurality of key grooves of the fifth cylinder member and the plurality of cam grooves of the fourth cylinder member, A sixth cylinder member that is disposed inside the five cylinder member and is moved only in the optical axis direction by rotation of the fourth cylinder member;
The second lens group is attached and has a plurality of follower pins engaged with both the plurality of second key grooves of the third cylinder member and the plurality of cam grooves of the second cylinder member, A frame member that is disposed inside the third cylindrical member and is moved only in the optical axis direction by rotation of the second cylindrical member;
A retractable camera lens barrel characterized by comprising:   The fourth cylinder member includes an outer cylinder member and an inner cylinder member that are integrally assembled with each other, and the outer cylinder member includes a plurality of cam grooves and the second cylinder of the third cylinder member. The plurality of follower pins that are engaged with both of the plurality of key grooves of the member, and the inner cylindrical member is the plurality of cam grooves that are engaged with the plurality of follower pins of the sixth cylindrical member. The plurality of cam grooves of the inner cylinder member are formed as through grooves having an inner wall surface orthogonal to the optical axis, and the plurality of follower pins of the sixth cylinder member have a cylindrical shape. The retractable camera lens barrel according to claim 2, wherein the lens barrel is retractable.   4. The collapsible member according to claim 1, wherein the sixth cylindrical member and the frame member are urged in opposite directions on the optical axis by at least one spring member. 5. Lens barrel for camera.   A motor is attached to the sixth cylinder member, and the first lens group is attached to the sixth cylinder member so as to be movable in the optical axis direction by the motor. 5. A retractable camera lens barrel according to any one of claims 1 to 4.   5. The retractable camera lens according to claim 1, wherein a third lens group is disposed in the first cylindrical member so as to be movable in the optical axis direction by a motor. The lens barrel.

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