JP5089902B2 - Retractable camera lens barrel - Google Patents

Description

  The present invention relates to a lens barrel of a retractable camera.

  The retractable camera is convenient when carrying or storing because the lens barrel can be stored in the camera body when there is no plan to take a picture. However, in order to do so, it is a problem that the dimension of the camera body in the optical axis direction becomes thick. For this reason, conventionally, it has been a big problem how to appropriately accommodate the lens barrel without increasing the thickness of the camera body. However, as cameras have become smaller in size as in recent years, it has become difficult to achieve such a favorable accommodation. Therefore, in the case of this type of camera, paying attention to the fact that a shutter device is usually built in the lens barrel, and when the lens barrel is housed in the camera body, the shutter blades are fully opened. In other words, it is known that a part of the lens can enter the working surface of the shutter blade. The present invention relates to a lens barrel of a retractable camera configured as described above, and the following Patent Document 1 describes an example of a camera including a zoom lens configured as such. Yes.

JP 2003-121720 A

  In recent shutter devices, the shutter blades are opened and closed by electromagnetic drive means. In the case of a retractable camera, it is usual to use a small actuator having a permanent magnet rotor. The permanent magnet rotor is reciprocally rotated by supplying a current to the stator coil. However, since the current to the stator coil is cut off when shooting is not performed, the rotor maintains a predetermined stop position by using the magnetic force of the permanent magnet. However, since the stopped state is maintained only by the magnetic force of the permanent magnet, it cannot be completely maintained. If the camera is subjected to strong vibration or impact caused by dropping, the rotor will move from the stop position. It may be temporarily rotated.

  Incidentally, in the configuration described in Patent Document 1, the shutter blades are fully opened in the retracted state so that a part of the lens can enter the operating surface of the shutter blades. The thickness can be reduced, and it can be said that this is an extremely effective configuration. However, as described above, when vibration or impact is applied to the camera, if the rotor temporarily rotates, the shutter blades may also be temporarily closed, thereby causing the shutter blades to move. The lens and the lens frame entering the working surface may collide with each other, scratching them, or destroying the shutter blade itself.

  The present invention has been made to solve such problems, and the object of the present invention is to provide at least one of a lens and a lens frame on the operating surface of a shutter blade in a fully open state when retracted. Provided is a lens barrel of a collapsible camera that can prevent a shutter blade from operating and colliding with a lens or a lens frame even when vibration or impact is applied to the camera when the part is inserted. That is.

In order to achieve the above object, a lens barrel of a retractable camera according to the present invention has a fixed barrel fixed in the camera body and an opening for a subject optical path, and the lens barrel in the fixed barrel A base plate that is integrally attached to the fixed cylinder, and a cover that is attached to the base plate and has an opening for a subject optical path at a position facing the opening, and forms a blade chamber on the base plate side A shutter blade disposed in the blade chamber, and shutter blade electromagnetic drive means attached to the ground plate, and the shutter blade electromagnetic drive means reciprocatingly rotates the shutter blade to open and close the opening. a shutter device for performing the operation, arranged light control blade and consist a light control blade electromagnetic drive means mounted on the base plate light quantity control blade electromagnetic drive in the blade chamber A light quantity control device for advancing and retracting the light amount control blade to the opening by the reciprocating rotation of the stage, the renormalization position during use of the camera is disposed on the object side of the shutter device in the inner fixed barrel have attached the imaging lens A lens frame extended toward the subject side, operating means standing on the lens frame toward the base plate, and reciprocatingly rotating around the optical axis by attaching the base plate and operating the operating means such that when the lens frame has a ring member is in the repeated narrowing position to prevent rotation of the shutter blade electromagnetic drive means in a direction to close the shutter blades in the first blocking portion formed on the ring member And the electromagnetic for the light quantity control blade in the direction in which the light quantity control blade enters the opening by the second blocking part formed on the ring member. When in the lens frame feeding state is brought to a state to prevent rotation of the motion means is provided with a, a mediating means to be brought to a non-blocking state from the blocking state, when in position narrowing the lens frame repeatedly, the A part of at least one of the taking lens and the lens frame is inserted into at least one of the two openings.

In this case, the base plate is attached to the fixed cylinder so as to be movable along the optical axis, and when the lens frame is in the extended state , a distance from the lens frame is set to a predetermined interval via a compression spring. When the lens frame moves to the retracted position, the lens frame first moves together with the base plate, and after the ground plate stops, the operation means is operated by compressing and moving the compression spring. The mediating means may be operated by

In order to achieve the above object, the lens barrel of the retractable camera according to the present invention includes a fixed barrel fixed in the camera body and a first lens group to which the most lens side is attached. The first lens frame that is extended to the subject side, which is larger than the retraction position when the camera is used, and the second lens group are disposed in the fixed cylinder. A second lens frame extended to the subject side, a ground plate having an opening for a subject optical path and attached to the first lens frame so as to face the second lens frame, and attached to the ground plate A cover plate having an opening for a subject optical path at a position facing the opening and forming a blade chamber on the ground plate side, a shutter blade disposed in the blade chamber, and the ground A shutter blade electromagnetic drive means attached to the shutter blade, and the shutter blade electromagnetic drive means reciprocatingly rotating the shutter blade to open and close the opening, and the shutter chamber is disposed in the blade chamber. A light quantity control device comprising a light quantity control blade and an electromagnetic drive means for the light quantity control blade attached to the base plate, wherein the light quantity control blade advances and retreats to and from the opening by reciprocating rotation of the light quantity control blade electromagnetic drive means; The second lens frame has an operating means erected toward the base plate, and a ring member attached to the base plate and capable of reciprocatingly rotating around the optical axis by the operation of the operating means. When the two lens frames are in the retracted position, the shutter blade is moved in the direction in which the shutter blade is closed by the first blocking portion formed on the ring member. The electromagnetic drive means is prevented from rotating, and the second blocking part formed on the ring member is in a state of preventing the light quantity control blade electromagnetic drive means from rotating in the direction in which the light quantity control blade enters the opening. Mediating means that is moved from the blocking state to the non-blocking state when the two lens frames are in the extended state, and when the two lens frames are in the retracted position, the second lens group and At least one part of the second lens frame is inserted into at least one of the two openings.
In this case, the base plate is attached to the fixed cylinder so as to be movable along the optical axis, and when the first lens frame is in the extended state, the gap from the first lens frame is provided via a compression spring. Is maintained at a predetermined interval, and the operation means is erected on the first lens frame toward the ground plate instead of being configured to be erected on the second lens frame toward the ground plate. When the first lens frame moves to the retracted position, it first moves together with the base plate, and after the base plate stops, the compression spring is compressed and moved by the operating means. When the mediating means is operated and the two lens frames are in the retracted position, at least one part of the first lens group and the first lens frame enters at least one of the two openings. It may be there Nde.

In order to achieve the above object, the lens barrel of the retractable camera according to the present invention includes a fixed barrel fixed in the camera body and a first lens group to which the most lens side is attached. The first lens frame that is extended to the subject side, which is larger than the retraction position when the camera is used, and the second lens group are disposed in the fixed cylinder. A second lens frame extended to the subject side, a ground plate having an opening for a subject optical path and attached to the second lens frame so as to face the first lens frame, and attached to the ground plate A cover plate having an opening for a subject optical path at a position facing the opening and forming a blade chamber on the ground plate side, a shutter blade disposed in the blade chamber, and the ground A shutter blade electromagnetic drive means attached to the shutter blade, and the shutter blade electromagnetic drive means reciprocatingly rotating the shutter blade to open and close the opening, and the shutter chamber is disposed in the blade chamber. A light quantity control device comprising a light quantity control blade and an electromagnetic drive means for the light quantity control blade attached to the base plate, wherein the light quantity control blade advances and retreats to and from the opening by reciprocating rotation of the light quantity control blade electromagnetic drive means; The first lens frame has an operating means erected toward the base plate, and a ring member attached to the base plate and capable of reciprocating rotation about the optical axis by the operation of the operating means. When the two lens frames are in the retracted position, the shutter blade is moved in the direction in which the shutter blade is closed by the first blocking portion formed on the ring member. The electromagnetic drive means is prevented from rotating, and the second blocking part formed on the ring member is in a state of preventing the light quantity control blade electromagnetic drive means from rotating in the direction in which the light quantity control blade enters the opening. Mediating means that is moved from the blocking state to the non-blocking state when the two lens frames are in the extended state, and when the two lens frames are in the retracted position, the first lens group and At least one part of the first lens frame is inserted into at least one of the two openings.
In this case, the base plate is attached to the fixed cylinder so as to be movable along the optical axis, and when the second lens frame is in the extended state, the gap from the second lens frame is provided via a compression spring. Is maintained at a predetermined interval, and the operation means is erected on the second lens frame toward the ground plate instead of being configured to be erected on the first lens frame toward the ground plate. When the second lens frame moves to the retracted position, the second lens frame moves together with the base plate. After the second lens frame reaches the retracted position, only the base plate moves by compressing the compression spring. Thus, when the operating means operates the mediating means, and when the two lens frames are in the retracted position, at least one part of the first lens group and the first lens frame or the second lens frame. A's group at least one of a portion of the second lens frame may be has entered at least one of the two openings.

Also, in each of the lens barrel described above, the the ring member, the have two projections having a cam surface capable of sliding contact is formed in the electromagnetic drive means, the blocking portion thereof tip You may be made to do. Further, two blade chambers may be configured, and the shutter blades may be disposed in one blade chamber, and the light amount control blades may be disposed in the other blade chamber.

  According to the present invention, when the lens barrel is retracted, the shutter blade is fully opened, and a part of the lens is allowed to enter the operating surface of the shutter blade. Since the intermediary means for automatically preventing the rotation of the electromagnetic driving means for the shutter blades is attached, the shutter blade can be prevented from colliding with the lens or the lens frame even if vibration or impact is applied to the camera. There is.

  Embodiments of the present invention will be described with reference to the illustrated examples. The lens barrel of the retractable camera according to the present invention can be used for both cameras using silver salt films and digital cameras. Further, it can be implemented as a zoom lens barrel or a non-zoom lens barrel. However, as an embodiment, the case of a zoom lens barrel used in a digital camera will be described, and the other cases will be appropriately described.

  This embodiment will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a photographing standby state in which the first lens group and the second lens group are extended. 2 is a plan view showing the blade driving device, which is only schematically shown in FIG. 1, as viewed from the subject side. FIG. 3 is a plan view of the blade driving device shown in FIG. 2 from the imaging device side. FIG. 4 is a plan view showing the state immediately after the end of photographing in the same manner as FIG. 5 is a cross-sectional view showing the collapsed state in the same manner as in FIG. 1, and FIG. 6 is viewed in the same manner as in FIGS. 3 and 4 to explain a situation that may occur in the retracted process. It is the shown top view.

First, the configuration of this embodiment will be described. As shown in FIG. 1, the body member 1 integrated with the camera body has two guide shafts 1a and 1b erected on the subject side surface in parallel with the optical axis O (see FIG. 1). In addition, although one such guide shaft is actually erected, its illustration is omitted). In addition, an imaging device 2 is attached to the main body member 1. As is well known, the imaging device 2 includes a solid-state imaging device such as a CCD, and normally, a low-pass is provided on the subject side. A filter plate such as a filter and a transparent cover plate are arranged. The fixed cylinder 3 having a substantially cylindrical shape is integrated with the main body member 1 and disposed in the camera body. A front wall 3a is formed at the tip of the subject side, and an inner wall 3b is formed inside. Is forming. And its front wall 3a, in addition to the opening 3c formed in a substantially circular shape, the two escape grooves 3d formed toward from the opening 3 c in the radial direction, it has a 3e. A decorative plate 4 is attached to the subject side surface of the front wall 3a so as to cover the two escape grooves 3d and 3e, and is not shown on the surface of the imaging device 2 side. However, two holes into which the tips of the guide shafts 1a and 1b are inserted are formed.

  A step motor 5 is attached to the inner wall 3b of the fixed cylinder 3, and a gear 6 is attached to the output shaft 5a. The lead screw 7 has two male screw portions 7 a and 7 b with different lead angles, and is rotatably attached to the main body member 1 and the front wall 3 a of the fixed cylinder 3. The gear 8 that meshes with the gear 6 is attached. The first lens frame 10 to which the first lens group 9 is attached has two projecting portions 10a and 10b projecting in the radial direction. There is another overhang portion corresponding to the overhang portion 10b), and a part of the overhang portions 10a and 10b is formed in the escape grooves 3e and 3d as shown in FIG. It has become possible to enter. In addition, the distal end side of the overhanging portion 10 a has a bent shape, and a female screw portion 10 c formed there is screwed into one male screw portion 7 a of the lead screw 7. Further, two guided portions 10d and 10e are formed at the branch from the projecting portion 10a, and the holes provided in them are slidably fitted to the guide shaft 1a. . An operation pin 10 f is erected on the projecting portion 10 a of the first lens frame 10 toward the main body member 1.

  The second lens frame 12 to which the second lens group 11 is attached has two projecting portions 12a and 12b projecting in the radial direction, and an internal thread portion 12c formed at the distal end of the projecting portion 12a. The lead screw 7 is screwed into the other male screw portion 7b. Further, the guided portion 12b is formed with two guided portions 12d, 12e and a stopper portion 12f. Of these, the two guided portions 12d and 12e are slidably fitted to the guide shaft 1b in the holes provided in them, and the stopper portion 12f is described later. It can come into contact with the blade driving device. The third lens frame 14 to which the third lens group 13 is attached has a projecting portion 14a projecting in the radial direction, and can slide with respect to the guide shaft 1a through a hole provided at the tip thereof. Is fitted. The first lens frame 10 and the second lens frame 12 are arranged such that when the step motor 5 is rotated and the lead screw 7 is rotated via the gears 6 and 8, the optical axis indicated by the one-dot chain line in FIG. Although the top can be moved, only the third lens frame 14 is moved on the optical axis by the rotation of a motor (not shown), and the focus is adjusted each time the image is taken. .

  The blade driving device of the present embodiment is schematically shown in FIG. 1, but two current-controlled actuators, which will be described later as an example of the electromagnetic driving means of the present invention, are attached to the surface of the ground plate 15 on the subject side. The partition plate 16, the intermediate plate 17, and the cover plate 18 are sequentially attached to the surface on the imaging device 2 side at predetermined intervals. Further, constituent members described later as an example of the mediating means of the present invention are arranged between the ground plate 15 and the partition plate 16, and the blade chamber formed between the partition plate 16 and the intermediate plate 17 includes Two shutter blades, which will be described later, are arranged as an example of the shutter blades of the invention, and a blade chamber formed between the intermediate plate 17 and the cover plate 18 will be described later as an example of the light quantity control blades of the present invention. A number of filter blades are arranged. Then, next, those specific structures will be described.

  First, in FIG. 2 in which the blade driving device of the present embodiment is viewed from the subject side, an opening 15a for the subject optical path is formed in a circular shape around the optical axis at a substantially central portion of the base plate 15. Similarly, the partition plate 16, the intermediate plate 17, and the cover plate 18 are formed with openings for the subject optical path. However, as can be seen from the cross-sectional view of FIG. Since the diameters of the formed openings are the same and are smaller than the openings of the openings 15a and the partition plate 16, the exposure openings are restricted by the openings formed in the intermediate plate 17 and the cover plate 18. become. Therefore, in FIG. 2, the opening part 17a of the intermediate | middle board 17 is shown inside the opening part 15a. However, it goes without saying that the opening 15a and the opening of the partition plate 16 may restrict the exposure opening.

  Three attachment portions 15b, 15c, and 15d are formed on the periphery of the base plate 15. Although not shown, guided members are attached to the attachment portions 15b, 15c, and 15d, respectively, and holes formed in the attachment portions 15b, 15c, and 15d include three guide shafts 1a and 1b. By slidably fitting the two guide shafts, the entire blade driving device can be moved along the optical axis. In addition, two spring shafts 15e and 15f are erected on the surface of the ground plate 15 on the subject side. These spring shafts 15e and 15f are shown only in cross section in FIG. 2, but as can be seen from the case of the spring shaft 15e shown in FIG. 5, the overhanging portion 10b of the first lens frame 10 is shown. A flange portion is formed at the tip thereof, and a compression spring 19 is fitted between the overhanging portion 10 b and the main plate 15. In the state of FIG. 1, the compression spring 19 causes the protruding portion 10 b of the first lens frame 10 to abut on the flange portion, and a predetermined distance is provided between the first lens frame 10 and the blade driving device. However, as described later, when the lens barrel is in the retracted state, it is pushed and compressed by the overhanging portion 10b of the first lens frame 10, and the distance between the first lens frame 10 and the blade driving device is narrowed. Trying to get.

  The base plate 15 is formed with three arc-shaped long holes 15g, 15h, and 15i. Although not shown, the partition plate 16, the intermediate plate 17, and the cover plate 18 are also formed with long holes having the same shape at positions corresponding to the long holes 15h and 15i. Further, a bent spring hooking portion 20 a provided in a ring member 20 (described later) disposed between the main plate 15 and the partition plate 16 passes through the long hole 15 g, and the spring hook provided in the main plate 15 is provided. A coil spring 21 is hung between the portion 15j.

  Further, on the subject side surface of the base plate 15, a second actuator 22 that is electromagnetic driving means for shutter blades and a second actuator that is electromagnetic driving means for light quantity control blades and has the same configuration as the first actuator 22 are provided. Although the actuator 23 is attached, these actuators 22 and 23 have a known configuration as described in, for example, Japanese Patent Application Laid-Open No. 2005-287159. Therefore, although detailed description of the configuration is omitted, FIG. 2 shows rotors 22a and 23a made of permanent magnets that are rotated within a predetermined angle range corresponding to the energization direction to the stator coil. Yes. The output pins 22b and 23b that are integrally formed in the radial direction of the rotors 22a and 23a pass through the long holes 15h and 15i, and the partition plate 16, the intermediate plate 17, and the cover plate. 18 is inserted into a long hole (not shown) provided in the box 18.

Next, the configuration of the ground plane 15 on the imaging device 2 side will be described. 3 and 4 show the blade driving device of the present embodiment as viewed from the image pickup device 2 side. The partition plate 16, the intermediate plate 17, and the cover plate 18 constituting the two blade chambers are shown in FIGS. The illustration is omitted. Therefore, the shutter blades and the filter blades arranged in the two blade chambers are indicated by two-dot chain lines. First, the main shape of the surface of the ground plate 15 on the imaging device 2 side and the arrangement configuration between the ground plate 15 and the partition plate 16 (not shown) will be described. In Figure 3, the surface of the image pickup apparatus 2 side of the main plate 15, three blade roots shaft 15k, 15 m, and 15n, six stopper shaft 15p, 15q, 15r, 15s, 15t, and 15u have been erected, They are inserted into holes (not shown) provided in the partition plate 16, the intermediate plate 17 and the cover plate 18.

  Further, an annular groove 15v is formed around the opening 15a of the base plate 15, and the ring member 20 is rotatably disposed therein. In addition to the above-described spring hooking portion 20a, the ring member 20 is formed with two protruding portions 20b and 20c protruding in the radial direction and a connecting portion 20d composed of two bent portions. As can be seen from FIG. 3, 20 b and 20 c can face the operating locus of the output pins 22 b and 23 b of the rotors 22 a and 23 a, and their front end faces are clockwise of the rotors 22 a and 23 a. The rotation to can be prevented. In addition, each of the protrusions 20b and 20c has one of two side surfaces formed on the cam surface for the reason described later. Note that the blade driving device of the present embodiment is provided with two protrusions 20b and 20c because the shutter device and the filter device are configured as a single unit. Of course, the protrusion 20c is unnecessary.

  In this embodiment, the connecting member 24 constitutes the mediating means of the present invention together with the ring member 20. The connecting member 24 has a rotating shaft 24a and two arm portions 24b and 24c, and the rotating shaft 24a is rotatably fitted in a hole 15w formed in the base plate 15 so that one arm portion. 24b is connected to the ring member 20 by being sandwiched by the connecting portion 20d. The other arm portion 24c is provided with a pushed portion 24d having a cam surface. When the pushed portion 24d is pushed by the operation pin 10f, the connecting member 24 is counterclockwise. The ring member 20 is rotated in the clockwise direction against the force of the coil spring 21 described above. In the configuration of the present embodiment, when the filter device is not required and only the shutter device is used, the ring member 20 may not be provided with the protrusion 20c as described above. It is also possible not to have 20 itself. As an example in that case, it is considered that a spring that urges the connecting member 24 to rotate in the clockwise direction is hung so that the arm portion 24b can face the operating locus of the output pin of the rotor 22a. It is done.

  Next, although not shown in FIG. 3, a blade chamber of a shutter blade is configured between the partition plate 16 and the intermediate plate 17 shown in FIG. In the case of this embodiment, as shown by a two-dot chain line in FIG. 3, two shutter blades 25 and 26 are arranged in the blade chamber, and the shutter blade 25 has a blade shaft 15k. A long hole (not indicated) is fitted to the output pin 22b, and the shutter blade 26 is rotatably attached to the blade shaft 15m. The output pin 22b is fitted. In this embodiment, two shutter blades are provided. However, if the shutter blade is enlarged, only one shutter blade may be used. In this embodiment, the blade chamber of the shutter blade is configured between the partition plate 16 and the intermediate plate 17, but the ring member 20 and the connecting member 24 are provided on the subject side surface of the base plate 15. In this case, since the partition plate 16 is not necessary, the blade chamber of the shutter blade is configured between the ground plate 15 and the intermediate plate 17. Furthermore, when the filter device is not provided and only the shutter device is provided, the blade driving device of this embodiment is the shutter device of the present invention, and the intermediate plate 17 is not required, so the blade chamber of the shutter blade. May be configured between the partition plate 16 and the cover plate 18 or may be configured between the main plate 15 and the cover plate 18.

  Finally, the filter blade 27 employed in the present embodiment as an example of the light quantity control blade and the arrangement configuration thereof will be described. The filter blade 27 indicated by a two-dot chain line in FIG. 3 is disposed in the blade chamber between the intermediate plate 17 and the cover plate 18 shown in FIG. The filter blade 27 of the present embodiment has an opening 27a having a smaller diameter than the opening 15a of the base plate 15 and the opening 17a of the intermediate plate 17, and covers the opening 27a so as to cover the opening 27a. Is attached. And this filter blade | wing 27 is rotatably attached to the blade shaft 15n, The long hole (no code | symbol) is fitted to said output pin 23b. Further, since the ND filter sheet 27b is attached to the surface of the filter blade 27 on the cover plate 18 side, the ND filter sheet 27b is not shown in the figure, but the cover plate 18 is not damaged. In addition, a relief hole is formed at a location corresponding to the operating region of the ND filter sheet 27b.

  As can be seen from the configuration of the filter blade 27, the filter blade 27 of this embodiment is a diaphragm blade that is one of the light quantity control blades in the present invention when the ND filter sheet 27b is not attached. Therefore, when the filter blade 27 is replaced with such a diaphragm blade, the blade driving device of this embodiment is a blade driving device in which the shutter device and the diaphragm device are configured as one unit. In the present embodiment, the opening 27a of the filter blade 27 is made smaller than the diameter of the opening 17a of the intermediate plate 17 that restricts the exposure opening, but may be made larger than the diameter of the opening 17a. Needless to say, the filter blades 27 may be manufactured with only one ND filter sheet as long as measures are taken so as not to be damaged by the operation. In this embodiment, the shutter blades 25 and 26 are disposed in the blade chamber on the base plate 15 side, and the filter blade 27 is disposed in the blade chamber on the cover plate 18 side. 27 and the shutter blades 25 and 26 may be disposed in the blade chamber on the cover plate 18 side.

  Next, the operation of this embodiment will be described. FIG. 1 shows a shooting standby state in which the first lens group and the second lens group are extended. And in the case of a present Example, this state is a tele state. Therefore, when the wide state is set, the step motor 5 is rotated, and the first lens frame 10 and the second lens frame 12 are moved to the right in FIG. However, since the zooming operation itself is not directly related to the present invention, detailed description thereof is omitted. Further, in the zooming range, the operation pin 10f of the first lens frame 10 does not contact the pushed portion 24d of the connecting member 24 shown in FIG. Therefore, in this photographing standby state, the ring member 20 is rotated counterclockwise from the state shown in FIG. 3 by the biasing force of the coil spring 21, and the connecting member 24 is rotated clockwise. It is in the state shown in FIG.

  As a result, in this state, the protrusions 20b and 20c of the ring member 20 are retracted outside the operation locus of the output pins 22b and 23b. However, as is well known, this type of electromagnetic actuator is strong. As long as no vibration or impact is applied, the rotors 22a and 23a are in the rotational positions shown in FIG. 3, and the shutter blades 25 and 26 are brought into contact with the stopper shafts 15p and 15q by their output pins 22b and 23b. The filter blade 27 is in contact with the stopper shaft 15r. Therefore, in this photographing standby state, the opening 15a is fully opened as shown in FIG. 3, and of course, the intermediate plate opening 17a that regulates the exposure opening is also fully opened. Therefore, the photographer can perform zooming while observing the subject image using a liquid crystal display device or the like.

  When the release button is pressed at the time of shooting, prior to actual shooting, the metering device determines whether to shoot with the subject light dimmed or shot as it is, and if it is determined to dim and shoot Since the current is supplied to the stator coil of the second actuator 23 in the forward direction, the rotor 23a is rotated clockwise from the state shown in FIG. At this time, as described above, the ring member 20 is rotated counterclockwise from the state shown in FIG. 3, and the protrusion 20c is retracted out of the operating locus of the output pin 23b. Rotates the filter blade 27 clockwise by the output pin 23b. Then, as shown in FIG. 4, when the filter blade 27 comes into contact with the stopper shaft 15u and stops, the charge accumulated in the solid-state image sensor of the imaging device 2 is released, and the charge accumulation is newly performed. It starts and actual shooting is performed.

  When a predetermined time elapses, a current is supplied to the stator coil of the first actuator 22 in the forward direction by a signal from the exposure control circuit, and the rotor 22a is rotated clockwise from the state of FIG. . Therefore, the rotor 22a rotates the shutter blade 25 clockwise by the output pin 22b, rotates the shutter blade 26 counterclockwise, and closes the opening 15a. Thus, immediately after the opening 15a is closed, the state in which the shutter blade 25 abuts on the stopper shaft 15s and the shutter blade 26 abuts on the stopper shaft 15t and stops is the state shown in FIG. . In the stop state shown in FIG. 4, the shutter blade 25 is not in contact with the stopper shaft 15s. This is because the shutter blade 25 comes into contact with the stopper shaft 15s and the shutter blade 26 contacts the stopper shaft 15t. Since the shutter blades 25 and 26 are a well-known configuration for quickly stopping the contact timing, detailed description thereof is omitted.

  In this way, when the shutter blades 25 and 26 close the opening 15a, the electric charge accumulated in the solid-state imaging device is transferred to the storage device as imaging information. When the transfer is completed, current is supplied to the stator coils of the two actuators 22 and 23 in the opposite direction unlike the previous case. Therefore, the rotors 22a and 23a of the two actuators 22 and 23 rotate counterclockwise from the state shown in FIG. 4, and the rotor 22a opens the opening 15a to the shutter blades 25 and 26 by the output pins 22b. The rotor 23a moves the filter blade 27 away from the opening 15a by the output pin 23b. Then, the shutter blades 25 and 26 come into contact with the stopper shafts 15p and 15q, and the filter blade 27 comes into contact with the stopper shaft 15r and stops. Thereafter, the state where the energization to the stator coils of the two actuators 22 and 23 is cut off is the photographing standby state described first.

  After that, if there is no intention to shoot and the lens barrel is in the retracted state, the camera's power switch is turned off. However, the delay circuit is still active and the on state continues for a predetermined time. It is supposed to be. Therefore, on the other hand, the third lens frame 14 is moved to the initial position by a motor (not shown). On the other hand, the step motor 5 also moves the two lens frames 10 and 12 to the right in FIG. 1 beyond the zooming operation range via the lead screw 7. In this case, since the moving speeds of the first lens frame 10 and the second lens frame 12 are different, the cover plate 18 comes into contact with the stopper portion 12f when the zooming operation range is exceeded, and thereafter, the compression spring 19 Is compressed and the distance between the first lens frame 10 and the blade driving device is narrowed, and the operation pin 10f of the first lens frame 10 starts to push the driven portion 24d of the connecting member 24. Therefore, the ring member 20 is rotated clockwise by the connecting member 24 against the urging force of the coil spring 21 from the rotational position shown in FIG. As a result, at the stage where the tip surfaces of the protrusions 20b and 20c face the operating locus of the output pins 22b and 23b, the first lens group 9 and the first lens frame 10 are placed in the opening 15a of the base plate 15. It becomes intruding. The state in which the step motor 5 is stopped by detecting the position of a sensor (not shown) is a retracted state, and FIGS. 3 and 5 show this state. Thus, in the case of the present embodiment, in the retracted state, the first lens group 9 and the first lens frame 10 are located up to the operating surfaces of the shutter blades 25 and 26 and the filter blades 27. The thickness of can be reduced.

In order to change from the retracted state to the above-described shooting standby state, the power switch of the camera is turned on. Accordingly, when the step motor 5 is rotated and the lead screw 7 is rotated via the gears 6 and 8, the first lens frame 10 and the second lens frame 12 move to the left from the positions in FIG. 5 at different speeds. since we are, the compression spring 19 is gradually stretched along with it. And just before reaching the zooming operating range, the overhanging portion 10b of the first lens frame 10 comes into contact with the flange portion formed at the tip of the spring shafts 15e, 15f, and starts to push, Since the operation pin 10f of the first lens frame 10 is separated from the driven portion 24d of the connecting member 24, the ring member 20 is rotated counterclockwise by the biasing force of the coil spring 21 from the position of FIG. When the rotational position shown in FIG. 4 is reached, the protrusion 20c comes into contact with the wall of the annular groove 15v and stops. Thereafter, when the two lens frames 10 and 12 and the blade driving device are in the state shown in FIG. 1, the rotation of the step motor 5 is stopped by detecting the position of a sensor (not shown). This state is the photographing standby state described first.

  In the above description, the explanation of the operation at the time of shooting was a case where the subject light is dimmed, but when shooting without dimming the subject light, the operation explanation at the time of shooting is as follows. In the initial stage after the release, the stator coil of the second actuator 23 is energized and the filter blades 27 are not rotated, the electric charge of the solid-state imaging device is immediately released, and shooting is started. The shutter blades 25 and 26 are operated by the operation 22, but the description of the operation of the shutter blades 25 and 26 is omitted because it overlaps with the above description.

  By the way, when the camera is carried in the retracted state as described above, a large vibration may be given to the rotors 22a and 23a by swinging the camera greatly. Also, when you carry it, you may hit something and give a strong impact. If such strong vibration or impact acts to rotate the rotors 22a and 23a in the counterclockwise direction in FIG. 3, the shutter blades 25 and 26 and the filter blades 27 come into contact with the respective stopper shafts. However, the problem is small, but when the rotors 22a and 23a are operated to rotate clockwise, the shutter blades 25 and 26 and the filter blades 27 are connected to the first lens group 9 or the first lens frame 10. There is a possibility that they will come into contact with each other, scratching them, or destroying the blades themselves. However, in the case of this embodiment, when such a force is applied to the rotors 22a and 23a, the output pins 22b and 23b are prevented from being formed at the tips of the protrusions 20b and 20c of the ring member 20. Since it abuts against the surface and is prevented from rotating, such a situation does not occur.

  Also, when manufacturing the lens barrel, when the retracting operation is tested by rotating the step motor 5, it is mistakenly performed with the shutter blades 25 and 26 closed, or the filter blade 27 is exposed to the opening. In the case of the present embodiment, the side surfaces of the protrusions 20b and 20c provided on the ring member 20 on the side that rotates in the clockwise direction are formed in a cam shape. Therefore, before the first lens group 9 and the first lens frame 10 enter the operating surfaces of the shutter blades 25 and 26, their cam surfaces push the output pins 22b and 23b to bring them into the state shown in FIG. It is like that. Therefore, the above test can be performed without connecting the stator coils of the actuators 22 and 23 to the control circuit. Moreover, in this case, as can be seen from FIG. 6, the cam surface of the projection 20c starts to push the output pin 23b earlier than the cam surface of the projection 20b starts to push the output pin 22b. The step motor 5 is not subjected to a larger load than when the pressing is started at the same time.

  In the above description of the operation, the lens barrel having the configuration of the present embodiment is used in a digital camera. However, the lens barrel having such a configuration can also be employed in a silver salt film camera. As an example of doing so, the cam surface of the protrusion 20b of the ring member 20 presses the output pin 22b immediately after a well-known barrier blade (not shown) closes the opening 3c of the fixed cylinder 3. When the shutter blades 25 and 26 are in the retracted state with the opening 15a fully opened, a part of the outer peripheral portion of the first lens frame 10 may be configured to block the opening 15a of the base plate 15.

In the above embodiment, the case where both the first lens group 9 and the first lens frame 10 partially enter the working surfaces of the shutter blades 25 and 26 when the retracted state is described. In the present invention, either one of them may be used, and not the first lens group 9 and the first lens frame 10 but a part of at least one of the second lens group 11 and the second lens frame 12 enters. You may do it. In the above embodiment, the operation pin 10f provided on the first lens frame 10 is configured to press the driven portion 24d of the connecting member 24. As can be understood from the above description, Such an operation pin may be provided on the second lens frame 12. In the above embodiment, when performing zooming, the blade driving device operates integrally with the first lens frame 10, but the present invention is not limited to such a configuration. It does not matter even if it operates integrally with the lens frame. However, in such a configuration, the operation pin 10f is attached to the first lens frame 10 as in the embodiment so that the distance between the blade driving device and the second lens frame 12 does not change even in the retracted state. A compression spring corresponding to the compression spring 19 of the embodiment is disposed between the blade driving device and the second lens frame 12 so that the distance between the blade driving device and the second lens frame 12 is in the retracted state. to be smaller, by Ru provided an operation pin 10f in the first lens frame 10 Unisuru or as examples, become the operating pin corresponding thereto to be provided to the second lens frame 12.

  Furthermore, although the above embodiment is configured as a zoom lens barrel, the present invention can also be configured as a non-zoom lens barrel such as pan focus. In the case of such a configuration, the second lens frame 12 is unnecessary together with the second lens group 11 in the embodiment, but the blade driving device is movable in the fixed cylinder 3 as in the embodiment. There are cases where it is attached to the fixed cylinder integrally. Further, in the case of such a lens barrel that is not a zoom type or in the case of a zoom type lens barrel as in the above-described embodiment, if the main plate 15 is movable within the fixed cylinder 3, an operation pin is used. The operation pin corresponding to 10f may be erected toward the base plate 15 with respect to a member integrated with the camera body such as the main body member 1 in the embodiment.

It is sectional drawing of the Example which shows the imaging | photography standby state which extended the 1st lens group and the 2nd lens group. FIG. 2 is a plan view showing the blade driving device schematically shown in FIG. 1 as viewed from the subject side. FIG. 3 is a plan view showing the blade driving device shown in FIG. 2 as viewed from the imaging device side. It is the top view which looked and showed the state immediately after completion | finish of imaging | photography similarly to FIG. It is sectional drawing which showed the collapsed state similarly to FIG. FIG. 5 is a plan view seen in the same manner as in FIGS. 3 and 4 for explaining a situation that may occur in the retracting process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body member 1a, 1b Guide shaft 2 Imaging device 3 Fixed cylinder 3a Front wall 3b Inner wall 3c, 15a, 17a, 27a Opening part 3d, 3e Escape groove 4 Decorative plate 5 Step motor 5a Output shaft 6, 8 Gear 7 Lead screw 7a , 7b Male thread portion 9 First lens group 10 First lens frame 10a, 10b, 12a, 12b, 14a Overhang portion 10c, 12c Female thread portion 10d, 10e, 12d, 12e Guided portion 10f Operation pin 11 Second lens group 12 Second lens frame 12f Stopper portion 13 Third lens group 14 Third lens frame 15 Base plate 15a, 17a Opening portion 15b, 15c, 15d Mounting portion 15e, 15f Spring shaft 15g, 15h, 15i Long hole 15j, 20a Spring hook portion 15k , 15m, 15n Blade shaft 15p, 15q, 15r, 15s, 15t, 15u Stroke Par shaft 15v Annular groove 15w Hole 16 Partition plate 17 Intermediate plate 18 Cover plate 19 Compression spring 20 Ring member 20b, 20c Projection portion 20d Connection portion 21 Coil spring 22 First actuator 22a, 23a Rotor 22b, 23b Output pin 23 First 2 Actuator 24 Connecting member 24a Rotating shaft 24b, 24c Arm 24d Driven part 25, 26 Shutter blade 27 Filter blade 27b ND filter sheet

Claims (8)

  A fixed cylinder fixed in the camera body, a ground plate having an opening for a subject optical path and attached integrally to the fixed cylinder in the fixed cylinder, and the opening attached to the ground plate and the opening A cover plate which has an opening for a subject optical path at a position opposite to the portion and forms a blade chamber on the base plate side, a shutter blade arranged in the blade chamber, and a shutter blade attached to the base plate And a shutter device that causes the shutter blade to open and close the opening by reciprocating rotation of the shutter blade electromagnetic drive device, a light amount control blade disposed in the blade chamber, and the ground plate A light quantity control blade electromagnetic drive means attached to the light quantity, and the light quantity control blade electromagnetic drive means is moved back and forth by the reciprocating rotation of the light quantity control blade electromagnetic drive means. A control frame, a lens frame that is mounted on the subject side relative to the shutter device in the fixed cylinder and is extended toward the subject side relative to the retraction position when the camera is used, and the base plate on the lens frame When the lens frame is in the retracted position, the operating means is erected toward the base plate and has a ring member attached to the main plate and capable of reciprocating rotation about the optical axis by the operation of the operating means. A first blocking portion formed on the ring member blocks rotation of the shutter blade electromagnetic driving means in a direction to close the shutter blade, and a second blocking portion formed on the ring member controls the light amount control blade. The lens frame is extended when the electromagnetic drive means for the light quantity control blades is prevented from rotating in the direction in which the lens frame enters the opening. Intermediary means that is brought from the blocking state to the non-blocking state in some cases, and when the lens frame is in the retracted position, at least one part of the photographing lens and the lens frame is the two openings. A lens barrel of a collapsible camera, characterized in that the lens barrel enters into at least one of the above.   The base plate is attached to the fixed cylinder so as to be movable along the optical axis. When the lens frame is in the extended state, the distance from the lens frame is maintained at a predetermined interval via a compression spring. When the lens frame moves to the retracted position, the lens frame first moves together with the base plate, and after the base plate stops, the compression spring is compressed and moved, so that the intermediate means is operated by the operation means. 2. The lens barrel of a collapsible camera according to claim 1, wherein said means is operated.   A fixed cylinder fixed in the camera body and a first lens attached to the first lens group and disposed closest to the subject side in the fixed cylinder, and when the camera is used, the first lens is extended to the subject side larger than the retraction position. A frame, a second lens group attached to the fixed tube, and having a second lens frame extended toward the subject side from the retracted position when the camera is used, and an opening for the subject optical path, A ground plane attached to the first lens frame so as to face the second lens frame, and an opening for a subject optical path that is attached to the ground plane and faces the opening, and on the ground plane side And a shutter plate disposed in the blade chamber, and shutter blade electromagnetic driving means attached to the base plate. A shutter device that causes the shutter blades to open and close the opening by reciprocating rotation of the root electromagnetic drive means; a light quantity control blade disposed in the blade chamber; and a light quantity control blade electromagnetic drive means attached to the base plate A light quantity control device for moving the light quantity control blade back and forth with respect to the opening by reciprocating rotation of the electromagnetic drive means for the light quantity control blade, and an operation means standing on the second lens frame toward the base plate And a ring member attached to the base plate and capable of reciprocatingly rotating around the optical axis by operation of the operating means, and formed on the ring member when the two lens frames are in the retracted position. A second blocking portion formed on the ring member for blocking rotation of the shutter blade electromagnetic driving means in a direction in which the shutter blade is closed by the first blocking portion. When the light control blade electromagnetic drive means is prevented from rotating in the direction in which the light control blade enters the opening, and the two lens frames are in the extended state, the blocking state is changed to the non-blocking state. Mediating means, and when the two lens frames are in the retracted position, at least one part of the second lens group and the second lens frame is in at least one of the two openings. A lens barrel of a collapsible camera, characterized in that it is inserted. The base plate is attached to the fixed cylinder so as to be movable along the optical axis, and when the first lens frame is in the extended state, a distance from the first lens frame is predetermined via a compression spring. The operation means is erected on the first lens frame toward the ground plate, instead of being configured to be erected on the second lens frame toward the ground plate, When the first lens frame moves to the retracted position, it first moves together with the base plate, and after the base plate stops, it moves by compressing the compression spring to move the mediating means by the operating means. When the two lens frames are in the retracted position, at least one of the first lens group and the first lens frame is in at least one of the two openings. Lens barrel collapsible camera according to claim 3, characterized in that there was Unishi.   A fixed cylinder fixed in the camera body and a first lens attached to the first lens group and disposed closest to the subject side in the fixed cylinder, and when the camera is used, the first lens is extended to the subject side larger than the retraction position. A frame, a second lens group attached to the fixed tube, and having a second lens frame extended toward the subject side from the retracted position when the camera is used, and an opening for the subject optical path, A ground plate attached to the second lens frame facing the first lens frame, and an opening for a subject optical path that is attached to the ground plate and is opposed to the opening. And a shutter plate disposed in the blade chamber, and shutter blade electromagnetic driving means attached to the base plate. A shutter device that causes the shutter blades to open and close the opening by reciprocating rotation of the root electromagnetic drive means; a light quantity control blade disposed in the blade chamber; and a light quantity control blade electromagnetic drive means attached to the base plate And a light quantity control device for moving the light quantity control blade back and forth with respect to the opening by reciprocating rotation of the electromagnetic drive means for the light quantity control blade, and an operating means erected on the first lens frame toward the base plate And a ring member attached to the base plate and capable of reciprocatingly rotating around the optical axis by operation of the operating means, and formed on the ring member when the two lens frames are in the retracted position. A second blocking portion formed on the ring member for blocking rotation of the shutter blade electromagnetic driving means in a direction in which the shutter blade is closed by the first blocking portion. When the light control blade electromagnetic drive means is prevented from rotating in the direction in which the light control blade enters the opening, and the two lens frames are in the extended state, the blocking state is changed to the non-blocking state. Mediating means, and when the two lens frames are in the retracted position, at least one of the first lens group and the first lens frame is in at least one of the two openings. A lens barrel of a collapsible camera, characterized in that it is inserted. The base plate is attached to the fixed cylinder so as to be movable along the optical axis, and when the second lens frame is in the extended state, a distance from the second lens frame is predetermined via a compression spring. The operation means is erected on the second lens frame toward the ground plate, instead of being configured to be erected on the first lens frame toward the ground plate, When the second lens frame moves to the retracted position, the second lens frame moves together with the base plate, and after the second lens frame reaches the retracted position, only the base plate moves by compressing the compression spring, thereby moving the second lens frame. When the operating means operates the mediating means and the two lens frames are in the retracted position, at least one part of the first lens group and the first lens frame or the second lens group and the front Lens barrel collapsible camera according to claim 5 in which at least one of a portion of the second lens frame is characterized in that as has entered at least one of the two openings. Wherein the ring member, said two projections having a cam surface capable sliding contact is formed in each electromagnetic driving means, to claim 1 and their tip, characterized in that in said blocking portion 6. A lens barrel of a collapsible camera according to any one of 6 above. The said blade chamber is comprised by two, The said shutter blade is arrange | positioned in one blade chamber, The said light quantity control blade is arrange | positioned in the other blade chamber, The 1 thru | or 7 characterized by the above-mentioned. A lens barrel of the retractable camera according to any one of the above.

Images