JP5394711B2 - Aperture device for optical equipment - Google Patents

Description

  The present invention is for an optical apparatus in which a plurality of diaphragm blades are reciprocally rotated in the same direction simultaneously by a diaphragm drive ring, and the size of a diaphragm aperture formed in cooperation is changed continuously or stepwise. The present invention relates to a diaphragm device.

  A diaphragm device in which a plurality of diaphragm blades are reciprocally rotated in the same direction at the same time by a diaphragm drive ring, and the size of a diaphragm aperture formed in cooperation is changed continuously or stepwise. Patent Document 1 listed below uses a current-controlled electromagnetic actuator that can stop the rotation of the rotor at an arbitrary position within a predetermined rotation angle range as a drive source of the drive ring. ing. This diaphragm device is described in Patent Document 1 as being mainly used for a projector, but it can also be used for various cameras.

  A diaphragm device in which a plurality of diaphragm blades are reciprocally rotated in the same direction at the same time by a diaphragm drive ring, and the size of a diaphragm aperture formed in cooperation is changed continuously or stepwise. A device using a step motor as a drive source of the aperture drive ring is described in Patent Document 2 below. This diaphragm device is described in Patent Document 2 as being used for various cameras, but it can also be used for a projector. In the case of this diaphragm device, the rotation start position of the diaphragm drive ring is directly adjusted in order to adjust the rotation start position (initial position) of the diaphragm drive ring slightly different due to individual differences in production. Therefore, an eccentric member (eccentric shaft) is provided.

  The present invention is an aperture device that employs an electromagnetic actuator of the type described in Patent Document 1 as a drive source, and by using an eccentric member as described in Patent Document 2, an individual in production The present invention relates to a diaphragm device for an optical apparatus that can suitably adjust a deviation of a diaphragm opening control position of a diaphragm drive ring caused by a difference.

JP 2006-251333 A JP 2002-258347 A

  Incidentally, in the diaphragm device described in Patent Document 2, since the drive source of the diaphragm drive ring is a step motor, each diaphragm opening corresponds to the number of pulses given on the basis of the initial position of the diaphragm drive ring. Be controlled. Therefore, for example, in the case of a diaphragm device in which the initial position is the control position of the maximum aperture opening, when the test was performed after the assembly was completed, the control position of the minimum aperture opening was obtained according to the standard, but the control position of the maximum aperture opening was If the control position of the maximum aperture opening is simply adjusted to the reference position by the eccentric member, the control position of the minimum aperture opening is shifted from the reference position. In addition, in that case, the control positions of other intermediate apertures are also shifted. Therefore, it is not easy to approximate all the aperture opening control positions to the reference position as a whole. The same thing can be said when the current control type electromagnetic actuator described in Patent Document 1 is used as a drive source.

  In the case of the diaphragm device described in Patent Document 2, since the gear is interposed between the step motor and the diaphragm drive ring, the initial position of the diaphragm drive ring is directly adjusted by the eccentric member. The eccentric member is attached in the blade chamber. Therefore, if a problem is found in a test after the assembly is completed, there is also a problem that adjustment work cannot be performed unless the cover plate constituting the blade chamber is removed from the main plate. .

  The present invention has been made in order to solve such problems. The object of the present invention is to continuously rotate the apertures of a plurality of aperture blades simultaneously in the same direction to continuously or In a diaphragm device in which the diaphragm drive ring that is changed stepwise is reciprocally rotated by a current-controlled electromagnetic actuator, the maximum diaphragm opening control position and the minimum diaphragm control position of the diaphragm drive ring in the blade chamber are determined. It is another object of the present invention to provide an aperture device for an optical instrument that can be appropriately adjusted outside the blade chamber in a state after the assembly is completed, and that a plurality of intermediate aperture opening control positions can be appropriately obtained.

To achieve the above object, a diaphragm for optical equipment device of the present invention includes a base plate which have a long hole have a circular opening centered on the optical axis, and around the optical axis A cover plate having a circular opening and constituting a blade chamber between the circular plate and the ground plate or the cover plate at positions that are substantially equiangularly spaced about the optical axis in the blade chamber. A plurality of diaphragm blades rotatably attached to the optical axis, a plurality of cam grooves formed at substantially equal angular intervals around the optical axis, and a single long hole. And a plurality of cam grooves, each having a diaphragm driving ring in which a connecting pin of each diaphragm blade is individually fitted, a permanent magnet, and the length of the main plate. two of the overhang portion and the predetermined angle range overhanging individually near both ends of the longitudinal hole A rotor that rotates in the radial direction, an arm portion that projects from the rotor in the radial direction, an output pin provided on the arm portion, and a bearing for the rotor, and a rotational position detecting means for the rotor A stator frame and at least one stator coil wound around the stator frame, and is attached to a surface outside the blade chamber of the main plate, and the output through the elongated hole of the main plate. An electromagnetic actuator in which a pin is inserted into the blade chamber and fitted into the elongated hole of the aperture drive ring, and the arm portion or the arm portion by being individually rotated at the time of manufacture attached to the two overhang portions features, and two eccentric member changing the contact position to regulate the both end positions of the rotational angle range of the rotor which enables adjusting the rotation start position and rotation end position of the diaphragm drive ring and the output pins So as to.

The front Symbol stator frame has a projecting portion of one of the long hole for inserting the output pin is formed, the two eccentric members are near both ends of the long holes Oite it may separately also be attached to the overhung portion.

Further, in the present invention, the output pin is disposed outside the blade chamber of the ground plate, and the ground plate has a drive pin and a mediating member that is reciprocally rotated in conjunction with the operation of the output pin. It may be attached, and the drive pin may be inserted into the blade chamber and fitted in the elongated hole of the aperture drive ring .

  According to the present invention, a diaphragm drive ring in which a plurality of diaphragm blades are simultaneously reciprocated in the same direction to change the size of the diaphragm aperture continuously or stepwise is reciprocated by a current-controlled electromagnetic actuator. In the diaphragm device, the position of both ends of the rotation angle range of the rotor of the electromagnetic actuator is adjusted by rotating two eccentric members attached to the outside of the device and serving as stoppers for reciprocal rotation of the rotor. Since both the maximum aperture opening control position and the minimum aperture opening control position of the aperture drive ring in the blade chamber are indirectly adjusted, the aperture is maintained in the assembled state without disassembling the device. The rotational angle range of the drive ring can be adjusted, and the rotational position detection means attached to the stator frame can rotate the rotor. By detecting the location, there is an effect that can be suitably controlled more intermediate aperture.

  The embodiment of the present invention will be described with reference to two illustrated examples. As described above, the aperture device for an optical apparatus according to the present invention can be an aperture device for a projector or an aperture device for a camera. This is configured as a diaphragm device for a camera. In the case of a diaphragm device for a camera, it is well known that the diaphragm device is constructed as a single unit together with the shutter device in addition to the case of being constructed as a single diaphragm device as in the embodiments. Therefore, the diaphragm device for optical equipment of the present invention includes a diaphragm device unitized with the shutter device. 1 to 5 are for explaining the first embodiment, and FIGS. 6 to 10 are for explaining the second embodiment.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing a control state of the maximum aperture opening, and FIG. 2 is a partially enlarged view of FIG. FIG. 3 is a plan view showing the electromagnetic actuator used in this embodiment with the flexible printed wiring board removed, and FIG. 4 is a cross-sectional view of a part of this embodiment. It is. FIG. 5 is a plan view showing a control state of the minimum aperture stop. In FIG. 1, a part of the main plate is cut away so that a part of the blade chamber can be seen.

  First, the configuration of this embodiment will be described. The base plate 1 and the cover plate 2 are made of synthetic resin and have substantially the same planar shape. The cover plate 2 is attached to the base plate 1 with three screws 3, 4, 5, and between the base plate 1 and the cover plate 2. The vane chamber is constructed. In addition, circular openings 1a and 2a are formed so as to overlap with each other around the optical axis at substantially the center of the base plate 1 and the cover plate 2, and there are three locations near the outer periphery to the camera body. The mounting holes 1b, 1c, 1d, 2b, 2c, 2d are overlapped.

  Further, the base plate 1 is formed with an arc-shaped long hole 1e penetrating to the blade chamber. Then, on the surface side, a mounting portion 1f mainly shown by a broken line in an L shape in FIG. 2 and a columnar mounting portion 1g shown only by a broken line are formed so as to be higher on the front side. Has been. Further, on the surface of the main plate 1 on the blade chamber side, a cylindrical portion 1h is formed along the edge of the opening 1a, and three blade mounting shafts 1i, 1j, 1k are erected. FIG. 4 shows the blade attachment shaft 1i, and the tip of the blade attachment shaft 1i is inserted into the hole 2e of the cover plate 2. However, the same applies to the other blade attachment shafts 1j and 1k. These tips are inserted into the respective holes.

  In the blade chamber, a diaphragm drive ring 6 and three diaphragm blades 7, 8, 9 are arranged. Among them, the diaphragm drive ring 6 has three cam grooves 6a, 6b, 6c and a long hole 6d formed at substantially equal angular intervals with the optical axis as the center. As shown in FIG. 4, the protrusion 1m formed along the outer periphery of the ground plane 1 can be rotated around the optical axis. And the tip of the protrusion 2 f formed along the outer periphery of the cover plate 2.

  The three diaphragm blades 7, 8, 9 have exactly the same shape, and like the diaphragm blade 7 shown in FIG. 4, an integrated tube member is connected to the blade mounting shafts 1i, 1j. , 1k so as to be rotatable. Further, these diaphragm blades 7, 8, 9 are provided with connecting pins 7 a, 8 a, 9 a that are fitted in cam grooves 6 a, 6 b, 6 c of the diaphragm drive ring 6.

  In this embodiment, three diaphragm blades are provided, but the number of cam grooves of the diaphragm drive ring 6 can be increased to four or more. In the case of this embodiment, the three diaphragm blades 7, 8, 9 are assembled by a so-called braided method. That is, the front ends of all the aperture blades are always overlapped with the adjacent aperture blades on the base plate 1 side so as to be on the cover plate 2 side. However, the present invention is not limited to such a configuration, and all aperture blades may be simply stacked in order from the main plate 1 side.

  An electromagnetic actuator M1 and a flexible printed wiring board P are sequentially attached to the surface outside the blade chamber of the base plate 1, and two eccentric members are provided in the vicinity of both ends in the length direction of the arc-shaped long hole 1e. 10 and 11 are attached. Therefore, their specific mounting configuration will be described in detail with reference to FIGS.

  The configuration of the electromagnetic actuator M1 of the present embodiment is basically similar to that used in the first embodiment described in Japanese Patent Application Laid-Open No. 2004-93874, for example. That is, a storage chamber is configured between the cup-shaped first stator frame 12 and the relatively plate-shaped second stator frame 13, and the rotor 14 having a permanent magnet is It arrange | positions in the storage chamber and is supported by those stator frames 12 and 13. The rotor 14 has a synthetic resin arm portion 14a that is integrally formed by projecting in a substantially radial direction, and a synthetic resin output pin 14b provided at the tip of the arm portion 14a. The majority of the arm portion 14a and the output pin 14b are located outside the storage chamber.

  Also, as shown in FIG. 3, two stator coils 15 and 16 are wound around the outside of the stator frames 12 and 13 so as to surround their bearing portions. Then, both ends of the stator coils 15 and 16 are wound around four terminal pins 12a, 12b, 12c and 12d provided on the first stator frame 12, respectively. Further, a cylindrical yoke 17 is fitted to the first stator frame 12 so as to surround the stator coils 15 and 16.

  Further, as shown in FIG. 3, the second stator frame 13 is formed with four overhanging portions 13a, 13b, 13c, and 13d in the periphery thereof, and the electromagnetic actuator M1 is formed of the second stator. The two holes 13e and 13f formed in the overhanging portions 13a and 13c of the frame 13 are used to attach the base plate 1 with two screws 18 and 19, but in the attached state, the rotor 14 The output pin 14b is inserted into the blade chamber from the arc-shaped long hole 1e of the base plate 1, and is fitted into the long hole 6d of the aperture drive ring 6 in the blade chamber.

  In the present embodiment, as described above, the two stator coils 15 and 16 are wound around the stator frames 12 and 13. In general, when a current is supplied to one stator coil 15 in such a configuration, a force is generated to rotate the rotor 14 in a clockwise direction corresponding to the current value, and a current is supplied to the other stator coil 16. When supplied, a force is generated to rotate the rotor 14 counterclockwise corresponding to the current value, and the rotor 14 is stopped at a position where these forces are balanced. . However, as described in Japanese Patent Application Laid-Open No. 2004-93874, it is also known that the rotor can be stopped at a predetermined rotational position even if only one stator coil is wound. . Therefore, the electromagnetic actuator of the present invention may employ any configuration.

  A rigid printed wiring board 20 is soldered to the flexible printed wiring board P. In addition, a hall element 21 is attached to the printed wiring board 20 as means for detecting the rotational position of the rotor 14. Then, the flexible printed wiring board P inserts the hard printed wiring board 20 into the recess 12e of the first stator frame 12 shown in FIG. 3 so that the Hall element 21 faces the peripheral surface of the rotor 14, And after making said terminal pin 12a, 12b, 12c, 12d penetrate to four holes, it attaches to said attachment part 1f, 1g of the ground plane 1 with two screws 22,23, and then terminal pin 12a, 12b, 12c, and 12d are soldered. 1 and 5, the illustration of the hard printed wiring board 20 and the hall element 21 is omitted.

  The two eccentric members 10 and 11 attached at positions near both ends in the length direction of the long hole 1e have exactly the same shape, and are usually referred to as eccentric pins. These eccentric members 10 and 11 are composed of column-shaped heads 10a and 11a and pins 10b and 11b provided at their eccentric positions. 10c, 11c and mark holes 10d, 11d are formed. The eccentric members 10 and 11 have the pins 10b and 11b fitted into the two reference holes 1n formed in the main plate 1, respectively. FIG. 4 shows the two reference holes 1n. Of these, the reference hole 1n into which the pin 10b of the eccentric member 10 is fitted is shown. Although the eccentric members 10 and 11 of the present embodiment are manufactured as eccentric pins, the eccentric member of the present invention may be an eccentric screw. This also applies to the second embodiment.

  Although the present embodiment is configured as described above, an individual difference adjusting method in the present embodiment will be described here. The individual difference adjustment in the present embodiment is characterized in that it can be performed outside the blade chamber in the assembled state of all the constituent members as shown in FIG. First, as shown in FIG. 2, the eccentric members 10 and 11 are set so that the mark holes 10d and 11d are located on the same side of the slits 10c and 11c, and the arm portion 14a of the rotor 14 is placed on the heads 10a and 11a. When the contact is made, the slits 10c and 11c are set to be substantially parallel to the arm portion 14a. This state is a restriction state of the reference rotation angle range of the rotor 14 for the eccentric members 10 and 11. That is, when the arm portion 14a of the rotor 14 is in contact with the head portion 10a of the eccentric member 10 in this state, the three diaphragm blades 7, 8, and 9 should be in the normal maximum diaphragm opening control position. In addition, when the arm portion 14a of the rotor 14 is in contact with the head portion 11a of the eccentric member 11, the three diaphragm blades 7, 8, and 9 should be in the normal minimum diaphragm opening control position. It is.

  However, in reality, individual differences occur due to the effects of component processing and assembly processing. Therefore, first, when the normal maximum diaphragm opening is not obtained in a state where the arm portion 14a of the rotor 14 is in contact with the head 10a of the eccentric member 10, the position where the regular maximum diaphragm opening can be obtained. Rotate in a predetermined direction until it is fixed with adhesive. After that, the arm portion 14a of the rotor 14 is brought into contact with the head portion 11a of the eccentric member 11, and when the normal minimum diaphragm opening is not obtained in this state, the eccentric member 11 is obtained with the normal minimum diaphragm opening. Rotate it in a predetermined direction to a certain position and fix it with adhesive. As a result of this adjustment, the detection state of the rotor 14 by the Hall element 21 is also changed. Therefore, the detection circuit is also provided so that the intermediate aperture can also be detected appropriately in accordance with the rotation angle range of the rotor 14 after adjustment. Try to adjust.

  Thus, in this embodiment, the two eccentric members 10 and 11 are both attached to the main plate 1. Therefore, if it is a current control type electromagnetic actuator having a rotational position detecting means such as the Hall element 21 and does not have any problem in how to attach it to the ground plate, it is slightly different from the electromagnetic actuator M1 of this embodiment. Since electromagnetic actuators with different specifications can be applied, the electromagnetic actuators with those specifications can be used as replacement parts, particularly during repair.

  In the case of this embodiment, the arm portion 14a of the rotor 14 is brought into contact with the heads 10a, 11a of the eccentric members 10, 11, but the output pin 14b is also brought into contact. I do not care. In the present embodiment, the rotational position of the rotor 14 is detected by the Hall element 21 which is a magnetically sensitive element. However, the rotor 14 can be obtained by using other magnetically sensitive elements or photoelectric sensors. It is possible to detect the rotational position. Therefore, the rotational position detecting means of the present invention is not limited to the Hall element 21 as in the present embodiment. This also applies to the case of Example 2 below.

Next, the operation of this embodiment will be briefly described with reference to FIGS. FIG. 1 shows a state before the start of photographing and shows a state in which the three diaphragm blades 7, 8, and 9 fully open the opening 1a, that is, a control state of the maximum aperture opening. If the subject light has a predetermined brightness or is darker than the predetermined brightness, the image is taken as it is. If the subject light is brighter than the predetermined brightness, the rotor 14 of the electromagnetic actuator M1 is used. Is rotated counterclockwise. As a result, the output pin 14b rotates the diaphragm drive ring 6 in the clockwise direction, so that the three diaphragm blades 7, 8, 9 are pushed by the connecting grooves 7a, 8a, 9a into the cam grooves 6a, 6b, 6c, At the same time, it is rotated counterclockwise to enter into the opening 1a, and the aperture is made smaller by their cooperation.

  When the aperture device of this embodiment is employed in a still camera, the rotor 14 stops when a predetermined aperture opening is obtained, and then shooting is performed, and the aperture device is employed in a movie camera. If so, the rotator 14 is rotated clockwise or counterclockwise in response to changes in the subject light so that shooting is always performed under appropriate exposure conditions. The aperture opening is changed. FIG. 5 shows a state in which the arm portion 14a of the rotor 14 is in contact with the eccentric member 11 and the three diaphragm blades 7, 8, 9 have reached the control position of the minimum diaphragm opening. It is.

  In this way, when shooting is completed, the rotor 14 is rotated clockwise, and the aperture driving ring 6 is rotated counterclockwise by the output pin 14b. Therefore, the three diaphragm blades 7, 8, 9 are simultaneously rotated clockwise. These rotations are stopped when the arm portion 14 a of the rotor 14 contacts the eccentric member 10. Thereafter, when the energization of the electromagnetic actuator M1 is cut off, the state before the start of photographing shown in FIG. 1 is restored. Although the present embodiment has been described on the assumption that FIG. 1 is a state before the start of photographing, it is needless to say that the state shown in FIG. 5 may be changed to a state before the start of photographing.

  Next, Example 2 will be described with reference to FIGS. FIG. 6 is a plan view showing a control state of the maximum aperture opening, and FIG. 7 is a partially enlarged view of FIG. FIG. 8 is a plan view showing the electromagnetic actuator used in this embodiment with the flexible printed wiring board removed, and FIG. 9 is a cross-sectional view of a part of this embodiment. It is. Further, FIG. 10 is a partially enlarged view showing an example of the state after assembly adjustment in the same manner as FIG. FIG. 6 shows a part of the ground plane in a broken view so that a part of the blade chamber can be seen in the same manner as FIG. 1 used in the description of the first embodiment.

  In the first embodiment, the two eccentric members 10 and 11 are directly attached to the main plate 1. On the other hand, in this embodiment, the eccentric members 10 and 11 are attached to the electromagnetic actuator M2 of this embodiment. Therefore, in the base plate 1 of the present embodiment, two reference holes (one reference hole 1n is provided for fitting the pins 10a and 11a of the eccentric members 10 and 11 formed in the base plate 1 of the first embodiment). (Shown in FIG. 4) is not formed. The rest of the configuration of the present embodiment except for the configuration of the electromagnetic actuator M2 is exactly the same as that of the first embodiment. Therefore, in each figure, the same code | symbol as the case of Example 1 is attached | subjected to those structural members and parts including the eccentric members 10 and 11. FIG. Therefore, the description thereof will be omitted, but everything described in the first embodiment is also applied to the present embodiment.

  Moreover, although the electromagnetic actuator M2 of the present embodiment is different in configuration from the electromagnetic actuator M1 of the first embodiment, it is substantially different only in the shape of the second stator frame 13 in the first embodiment. The function is exactly the same. Therefore, also in the case of the electromagnetic actuator M2 of the present embodiment, the same reference numerals are given to substantially the same components and parts as in the case of the electromagnetic actuator M1. Therefore, except for the description of the shape of the second stator frame 13, everything described for the electromagnetic actuator M1 of the first embodiment also applies to the present embodiment.

  Therefore, the configuration of the present embodiment, which is different from the first embodiment, that is, the shape of the second stator frame 13 will be described mainly with reference to FIGS. As shown in FIG. 8, the second stator frame 13 of the present embodiment is also formed with four overhanging portions 13a, 13b, 13c, 13d, and the electromagnetic actuator M2 is the second stator. The two holes 13e and 13f formed in the projecting portions 13a and 13c of the frame 13 are used to attach the base plate 1 to the base plate 1 with two screws 18 and 19 as shown in FIG.

  However, the overhanging portions 13c and 13d of the present embodiment have a larger overhanging area than the overhanging portions 13c and 13d of the first embodiment, and project to the vicinity of both ends in the length direction of the long hole 1e of the base plate 1. . And in the area | region which protrudes in those vicinity parts, 13 g of reference holes are formed, respectively, and it is fitting the pins 10b and 11b of the eccentric members 10 and 11, FIG. Of the reference hole 13g, a reference hole 13g into which the pin 10b of the eccentric member 10 is fitted is shown.

  The present embodiment is configured as described above, and the eccentric members 10 and 11 are attached to the second stator frame 13 of the electromagnetic actuator M2 instead of the base plate 1 as in the first embodiment. However, the individual difference adjustment of the present embodiment is also performed by rotating the eccentric members 10 and 11 as in the case of the individual difference adjustment of the first embodiment. Therefore, a description of the specific adjustment method is omitted, but as an example of the adjustment result, by rotating the eccentric member 10 counterclockwise from the state of FIG. 7 and rotating the eccentric member 11 clockwise, FIG. 9 shows an example when the rotation angle range of the rotor 14 is reduced, that is, when the rotation angle range of the aperture drive ring 6 is reduced.

  Thus, in this embodiment, the two eccentric members 10 and 11 are both attached to the electromagnetic actuator M2. Therefore, the electromagnetic actuator M2 having such a configuration can be applied to a diaphragm device including a diaphragm driving ring having a slightly different reference rotation angle range as long as there is no problem in the mounting method to the ground plane. Further, when the electromagnetic actuator M1 used in the first embodiment fails, it can be used instead of the electromagnetic actuator M1.

  In the case of the present embodiment, the two eccentric members 10 and 11 are attached to the two overhang portions 13c and 13d formed on the second stator frame 13, respectively. In addition, the two overhang portions 13c and 13d are connected to form a single overhang portion, and a long hole for inserting the output pin 14b into the overhang portion is formed like the long hole 1e. However, it may be attached to the vicinity of both ends in the longitudinal direction of the long hole.

  The operation of the present embodiment is performed in exactly the same manner as in the first embodiment, with the control state of the maximum aperture opening shown in FIG. Although not shown, the state in which the minimum aperture opening is controlled by the three aperture blades 7, 8, 9 is substantially the same as the state shown in FIG. Therefore, the operation description is omitted.

  In the first embodiment, the two eccentric members 10 and 11 are both attached to the main plate 1. In the second embodiment, the two eccentric members 10 and 11 are both attached to the second stator frame 13. However, the present invention is not limited to such a configuration. For example, one eccentric member 10 may be attached to the main plate 1 and the other eccentric member 11 may be attached to the second stator frame 13. In each of the above embodiments, one bearing portion of the rotor 14 is provided in the first stator frame 12 and the other bearing portion is provided in the second stator frame 13. The stator frame is not limited to such a configuration. Various types of stator frames of this type of electromagnetic actuator are known.

  Further, in each of the above-described embodiments, the output pin 14b integrated with the rotor 14 is fitted into the long hole 6d of the diaphragm drive ring 6 in the blade chamber. However, the present invention is not limited to such a configuration. The output pin 14c of the present embodiment is not inserted into the blade chamber, but is disposed outside the blade chamber, and a mediating member that is reciprocally rotated in conjunction with the output pin 14c is provided outside the blade chamber of the base plate 1. The drive pin provided in the mediating member may be inserted into the blade chamber and fitted into the elongated hole 6d of the aperture drive ring 6 in advance. In such a case, the arm portion 14a and the output pin 14b may be brought into contact with the head portions 10a and 11a of the two eccentric members 10 and 11, or the mediating member and the drive pin may be connected. You may make it contact | abut to the head parts 10a and 11a of the two eccentric members 10 and 11. FIG.

It is the top view of Example 1 which showed the control state of the largest aperture opening. FIG. 2 is a partially enlarged view of FIG. 1. It is the top view which showed the electromagnetic actuator used for Example 1 by removing a flexible printed wiring board. 1 is a cross-sectional view showing a part of Example 1. FIG. It is the top view of Example 1 which showed the control state of the minimum aperture stop. It is the top view of Example 2 which showed the control state of the largest aperture opening. FIG. 7 is a partially enlarged view of FIG. 6. It is the top view which showed the electromagnetic actuator used for Example 2 by removing a flexible printed wiring board. 10 is a cross-sectional view showing a part of Example 2. FIG. FIG. 8 is a partially enlarged view showing an example of a state after assembly adjustment in the same manner as in FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground plate 1a, 2a Opening part 1b, 1c, 1d, 2b, 2c, 2d Attachment hole 1e, 6d Long hole 1f, 1g Attachment part 1h Tube part 1i, 1j, 1k Blade attachment shaft 1m, 2f Projection part 1n, 13g Reference hole 2 Cover plate 2e, 13e, 13f Hole 3, 4, 5, 18, 19, 22, 23 Screw 6 Diaphragm drive ring 6a, 6b, 6c Cam groove 7, 8, 9 Diaphragm blade 7a, 8a, 9a Connecting pin M1, M2 Electromagnetic actuator P Flexible printed wiring board 10, 11 Eccentric member 10a, 11a Head 10b, 11b Pin 10c, 11c Slot 10d, 11d Mark hole 12 First stator frame 12a, 12b, 12c, 12d Terminal pin 12e Recess 13 Second stator frame 13a, 13b, 13c, 13d Overhanging portion 14 Rotor 14a Arm portion 14b Output pins 15, 16 Stator coil 17 yoke 20 printed circuit board 21 Hall element

Claims (3)

Configure blade chamber between the main plate have a circular opening centered on the optical axis are have a long hole, and have a circular opening centered on the optical axis the base plate A cover plate, a plurality of diaphragm blades that are rotatably attached to the base plate or the cover plate at positions at substantially equal angular intervals around the optical axis in the blade chamber, and an optical axis. It has a plurality of cam grooves and one long hole formed at substantially equal angular intervals around the center, and is arranged so as to be rotatable around the optical axis in the blade chamber. A diaphragm drive ring in which the connecting pins of the diaphragm blades are individually fitted, and two projecting portions each having a permanent magnet and projecting in the vicinity of both longitudinal ends of the long hole of the base plate A rotor that rotates within a predetermined angular range and a bulge projecting radially from the rotor An arm portion formed, an output pin provided on the arm portion, a stator frame bearing the rotor and provided with a rotation position detecting means of the rotor, and at least wound around the stator frame A stator coil, which is attached to the outer surface of the blade chamber of the main plate, and the output pin is inserted into the blade chamber through the long hole of the main plate and fitted into the long hole of the diaphragm drive ring. an electromagnetic actuator that is, both ends of the rotation angle range of the rotor changing the contact position between the arms or the output pins by being rotated individually at the time of fabrication is attached to said two projecting portions An aperture device for an optical apparatus, comprising: two eccentric members that regulate positions and allow adjustment of a rotation start position and a rotation end position of the diaphragm drive ring . The stator frame has one overhang part in which a long hole for inserting the output pin is formed, and the two eccentric members are individually provided in the vicinity of both ends of the long hole. The aperture device for an optical apparatus according to claim 1, wherein the diaphragm device is attached to an overhang portion . The output pin is disposed outside the blade chamber of the base plate, and the base plate is provided with a mediating member having a drive pin and reciprocatingly rotated in conjunction with the operation of the output pin. The aperture device for an optical apparatus according to claim 1 or 2, wherein a pin is inserted into the blade chamber and fitted into the elongated hole of the aperture drive ring .

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