JP5000990B2 - Camera aperture device - Google Patents

Description

  The present invention relates to a diaphragm device for a camera in which a plurality of blades are simultaneously rotated in the same direction by a diaphragm ring to change a diaphragm aperture in cooperation.

  2. Description of the Related Art A camera diaphragm device has been known for a long time in which a plurality of blades are simultaneously rotated in the same direction by a diaphragm ring to change a diaphragm aperture in cooperation. Among the diaphragm devices of this type, the diaphragm device employed in the popular camera is such that each blade is attached to the base plate so as to be rotatable at one end in the length direction, and the diaphragm ring is positioned in the vicinity thereof. It is normal to be connected. Therefore, the aperture diameter of each blade is changed in a state where the other end portion, that is, the tip end portion faces the photographing optical path. In addition, as described in the following Patent Document 1, the connection between each blade and the aperture ring is to fit a pin provided in the aperture ring into a long hole formed in the blade, As described in Patent Document 2 below, it is common to fit a pin provided on a blade into a long hole (generally referred to as a cam groove) formed in a diaphragm ring. Recently, the latter has become more common.

  In addition, the blades are attached to each other in the same manner as in the configuration described in Patent Document 1, in which the blades are simply stacked in order from the first blade. A device in which the tip of the last blade is prevented from contacting is known. This configuration is advantageous for cost reduction because the mounting operation is simple. However, since the plurality of blades are simply overlapped, it is difficult to keep adjacent blades in a predetermined close state. In particular, if the aperture for the photographic optical path is relatively large, the distal end faces the aperture, so the overlapping relationship between the distal ends is disturbed, resulting in unstable operation, and an appropriate minimum aperture. May not be obtained. Therefore, in order to prevent such a situation from occurring, as described in Patent Document 2, in the attached state, all the blades are configured to exist between two adjacent blades. It is known. The present invention relates to a diaphragm device for a camera in which the overlapping relationship between blades is configured as described in Patent Document 2.

Japanese Utility Model Publication No. 62-32266 JP 2005-284102 A

  Recent diaphragm devices for cameras use an electromagnetic actuator as drive means. In the case of the diaphragm device described in Patent Document 2, a step motor is used as drive means for rotating the diaphragm ring. Used. By the way, as is well known, when the overlapping relationship between the blades is configured as described in Patent Document 2, as the aperture diameter is reduced, the blades warp, and their tip portions are photographed. From the opening for the optical path, the tip portion rises in the direction in which the tip can be seen (in FIG. 3 of Patent Document 2, the depth direction of the drawing). In other words, the load on the step motor gradually increases. On the contrary, when trying to increase the aperture diameter from the state where the tip is raised, so-called catching occurs, the operation does not start smoothly, and the control in the area where the aperture diameter is small becomes unstable. There is also a case. Therefore, in the case of the diaphragm device having such a configuration in which the blades overlap each other, there is a problem that an electromagnetic actuator having a large driving force must be employed.

  The present invention has been made to solve such problems, and the object of the present invention is to ensure that all the blades exist between two adjacent blades in the mounted state. It is an object of the present invention to provide a camera diaphragm device that can suitably control a small aperture diameter despite being configured.

In order to achieve the above object, the diaphragm device for a camera according to the present invention has a plane perpendicular to the optical axis on the blade chamber side as a slope having a height difference in the direction along the optical axis, and is substantially centered on the optical axis. A ground plate having a plurality of cam surfaces formed in an arc shape, a plate member constituting the blade chamber between the ground plate, and a rotatable arrangement around the optical axis in the blade chamber A diaphragm having a plurality of cam surfaces formed on the surface on the ground plate side so as to be in contact with the cam surface of the ground plate and having a substantially arc shape with the slope direction reversed from the cam surface. A ring and each blade are overlapped between the diaphragm ring and the plate member so that a part of the ring is between adjacent blades, and are attached to the base plate or the plate member so as to be rotatable. It is connected to the aperture ring by the fitting configuration of the pin and the long hole. A diaphragm blades have the throttle ring consists of a plurality of vanes so as to vary the cooperation with aperture diameter when rotated, the surface of the vane chamber side of the base plate or the plate member have elasticity It is provided as a plurality of tongue pieces, and the cam surface of the aperture ring is always in contact with the cam surface of the main plate by making its tip always contact the surface of the aperture ring on the plate member side by its elasticity. Elastic means that presses the diaphragm ring so as to come into contact, and electromagnetic drive means that reciprocally rotates the diaphragm ring, and when the diaphragm ring is in a minimum diaphragm aperture control position, The distance from the plate member is maximized.

In that case, before Symbol base plate or the plate member is made of a synthetic resin, said plurality of tongue, a cost advantage when such are formed by the simultaneous integral molding during fabrication of the base plate or the plate member become. Further, the plurality of tongue pieces provided on the base plate may be a plurality of attachment pieces provided on the blade chamber side surface of the base plate in order to rotatably attach the diaphragm ring to the base plate. If it is, it becomes more preferable. Furthermore, in these camera diaphragm devices according to the present invention, the plate member is disposed between the ground plate and the auxiliary ground plate, and forms another blade chamber between the ground plate and the auxiliary ground plate. By arranging shutter blades in the blade chamber, it may be configured as a unit together with the shutter device.

  The present invention relates to a camera diaphragm device configured such that all blades exist between two adjacent blades, and the cam surface formed on the diaphragm ring is replaced with the cam surface formed on the base plate. On the other hand, when the diaphragm ring is rotated to the minimum diaphragm aperture control position by the electromagnetic drive means, the distance between the diaphragm ring and the plate member increases. As a result, the warpage of each blade does not become larger than in the conventional configuration, and the diaphragm control in a small aperture region can be stably performed without increasing the driving force of the electromagnetic driving means.

  The embodiment of the present invention will be described with reference to two illustrated examples. The camera diaphragm device of the present invention can be configured as a single diaphragm device or as a diaphragm device unitized with a shutter device. However, as an embodiment, a case where it is configured as a single diaphragm device will be described, and a diaphragm device unitized with a shutter device will be added after explaining two embodiments. 1 to 4 are for explaining the first embodiment, and FIGS. 5 to 8 are for explaining the second embodiment.

  A first embodiment will be described with reference to FIGS. FIG. 1 is a plan view showing a control state of the maximum aperture diameter. 2 is a cross-sectional view of the main part in the state of FIG. 1. FIG. 2 (a) shows the attachment position of the blade, and FIG. 2 (b) shows the attachment position of the aperture ring. It is. FIG. 3 is a plan view showing a control state of the minimum aperture diameter. 4 is a cross-sectional view of the main part in the state of FIG. 3, FIG. 4 (a) shows the attachment position of the blade, and FIG. 4 (b) shows the attachment position of the aperture ring. It is.

  First, the configuration of this embodiment will be described mainly with reference to FIGS. The diaphragm device for a camera according to the present embodiment forms a blade chamber between the ground plane 1 and the auxiliary ground plane 2, and FIG. 1 shows the auxiliary ground plane 2 from the side of the auxiliary ground plane 2 by showing a two-dot chain line. The configuration of the blade chamber is shown in an easy-to-understand manner. The base plate 1 of the present embodiment is made of synthetic resin, and has a large opening 1a at the center, and intermittently six walls 1b at the outer periphery. And the protrusion part 1c protruded to radial direction is formed in three places of the location which does not form the wall part 1b. The auxiliary base plate 2 is a thin metal plate member, and has a circular opening 2a centered on the optical axis at the center, and bent portions 2b at three locations on the outer periphery. Have. The auxiliary base plate 2 has a surface on the base plate 1 side of the outer peripheral portion brought into contact with the top surface of the wall portion 1b, and a hole provided in the bent portion 2b is engaged with the protruding portion 1c. 1 is screwed. In the present embodiment, the auxiliary base plate 2 is made of metal, but it may be made of synthetic resin and attached to the base plate 1 by another method.

  Further, on the blade chamber side of the base plate 1, a first annular surface 1d is formed immediately inside the wall portion 1b, and a second annular surface 1e is formed deeper than the first annular surface 1d on the inner side. ing. Further, on the second annular surface 1e, three cam surfaces 1f are formed in an arc shape with the optical axis as the center and as a slope having a height difference in the direction along the optical axis. In order to make it possible to understand the angular range in which the cam surfaces 1f are formed, the light beam is formed by placing a portion that starts to rise from the reference surface of the second annular surface 1e toward the auxiliary ground plane 2 and a highest portion. It is shown by a pair of radiating lines with a center on the axis. Of the pair of one-dot chain lines, the one-dot chain line on the right side with respect to the optical axis is the highest point, and therefore, three dot-dash lines indicating the part are denoted by the symbol H. Furthermore, three hook-like tongue pieces 1g are formed on the blade chamber side of the base plate 1 by simultaneous integral molding with a synthetic resin material. This tongue piece 1g can also be observed from FIG. 2 (b). It has elasticity.

  The diaphragm ring 4 of this embodiment is made of synthetic resin and has six cam-shaped long holes 4a. A tooth portion 4b and two concave portions 4c are formed on the outer peripheral portion. Further, on the surface facing the second annular surface 1e of the base plate 1, three cam surfaces 4d are formed in a circular arc shape with the optical axis as the center and as a slope having a height difference in the direction along the optical axis. However, in FIG. 1, in order to make it possible to understand the angular range in which the cam surfaces 4d are formed, the highest point and the highest point from the reference surface of the diaphragm ring 4 to the ground plane 1 side. Are shown by a pair of radial three-dot chain lines centered on the optical axis. Of the pair of three-dot chain lines, since the three-dot chain line on the left side with respect to the optical axis is the highest part, the three three-dot chain lines indicating the part are given the symbol h. It is. As can be seen from this, the cam surface 4d formed on the diaphragm ring 4 is opposite to the cam surface 1f formed on the second annular surface 1e of the main plate 1 in the slope height direction. (See FIG. 2).

  The aperture ring 4 is attached to the main plate 1 as follows. First, the cam surface 4d faces the ground plate 1 side, the position of the recess 4c is adjusted to the position of the tongue piece 1g, and dropped toward the second annular surface 1e. At this time, the diaphragm ring 4 is formed with only two recesses 4c, but the third recess has a part that is located on the inner side of the outer peripheral surface and connected to the tooth part 4b. Will do. Next, the tongue piece 1g is bent, and the aperture ring 4 is rotated counterclockwise to the position shown in FIG. After being assembled in this way, the aperture ring 4 is not rotated from the position of the concave portion 4c to the position of the tongue piece 1g, so that it does not come off the base plate 1. In such an assembled state, as shown in FIG. 2B, the cam surface 4d is brought into contact with the cam surface 1f by being pressed by the elasticity of the tongue piece 1g. In other words, the tongue piece 1g is not only an attachment piece for the diaphragm ring 4, but also serves as an elastic means for pressing the diaphragm ring 4.

  In the case of the present embodiment, the tongue piece 1g is formed by integral molding with the base plate 1 at the same time. However, the tongue piece 1g may be manufactured as a separate member having the same function and attached to the base plate 1. There is no problem. Further, in the case of the present embodiment, the inner diameter of the aperture ring 4 is larger than the diameter of the opening 2 a of the auxiliary base plate 2. For this reason, the size of the subject optical path is regulated by the opening 2a. However, the size of the subject optical path may be regulated by reducing the inner diameter of the aperture ring 4. Furthermore, in the case of the present embodiment, the opening 1a of the base plate 1 is formed in a considerably large non-circular opening, but this is a circle smaller than the diameter of the opening 2a and the inner diameter of the aperture ring 4. By doing so, the size of the subject optical path may be regulated.

  In the present embodiment, six blades 5 are provided as diaphragm blades. These blades 5 are made of synthetic resin and have the same shape, and have a blade shaft 5a and a connecting pin 5b on the same surface, and the blade shaft 5a is connected to the first annular surface 1d of the main plate 1. The coupling pin 5b is inserted into a long hole 4a formed in a cam shape in the aperture ring 4 so as to be rotatably fitted in the hole 1h formed in the first ring. In addition, these blades 5 are attached so that at least their tip portions overlap with adjacent blades, but in the case of this embodiment, not all the blades are overlapped in order. They are overlapped so as to exist between adjacent blades on both sides. In FIG. 3, in order to make the drawing easy to see, the elongated holes 4 a of the aperture ring 4, the blades 5, and the holes 1 h of the base plate 1 are only labeled for those related to one blade 5. is there.

  In the case of the present embodiment, the diaphragm ring 4 is reciprocally rotated by a step motor. The configuration of the step motor is the configuration of a known step motor described in Patent Document 2. Is substantially the same. Therefore, in FIG. 1, only the rotor 6 arrange | positioned at the blade chamber side is shown. The rotor 6 has an output gear 6 a and is rotatably attached to a shaft 1 i erected on the main plate 1. A reduction gear 7 is rotatably attached to the shaft 1j of the main plate 1. The reduction gear 7 is a two-stage gear having a parent gear and a child gear, and the parent gear is the output gear 6a. And the child gear is engaged with the tooth portion 4 c of the aperture ring 4.

  Next, the operation of this embodiment will be described. FIG. 1 shows a state in which the six blades 5 fully open the opening 2a, that is, a control state of the maximum aperture diameter. At this time, the cam surface 4d of the aperture ring 4 and the cam surface 1f of the base plate 1 are high in the direction along the optical axis direction as shown in FIGS. 2 (a) and 2 (b). Since the areas are in contact with each other, the distance between the aperture ring 4 and the auxiliary base plate 2 is minimized. In this state, when the rotor 6 rotates in the clockwise direction, the diaphragm ring 4 also rotates in the clockwise direction, so that the six blades 5 are simultaneously rotated counterclockwise and enter the opening 2a from the tip. By doing so, the aperture diameter formed in cooperation is reduced.

  When the aperture device of this embodiment is employed in a still camera, the rotor 6 stops when a predetermined aperture diameter is obtained, and shooting is performed, and the aperture device is employed in a movie camera. In such a case, the rotator 6 is rotated clockwise or counterclockwise in response to the change in the subject light so that shooting is always performed under appropriate exposure conditions. Although the aperture diameter is changed, FIG. 3 shows a state in which the minimum aperture diameter is formed as described above. At this time, the cam surface 4d of the aperture ring 4 and the cam surface 1f of the base plate 1 have different relative positional relationships as shown in FIGS. 4 (a) and 4 (b), but the tongue piece 1g. Due to this elasticity, the high region of the cam surface 4e is brought into contact with the low region of the cam surface 1f, so that the distance between the aperture ring 4 and the auxiliary base plate 2 is maximized.

  By the way, in this kind of conventional diaphragm device for a camera, the cam surface 4d is not formed on the diaphragm ring 4, and the cam surface 1f is not formed on the base plate 1, so that the diaphragm ring 4 has any diaphragm aperture. Even in the control position, the distance between the aperture ring 4 and the auxiliary base plate 2 was the same. Therefore, there are the following inconveniences. In the control state of the maximum aperture diameter shown in FIG. 1, each blade 5 overlaps with the blades on both sides adjacent to each other at different portions, so that the distance between the aperture ring 4 and the auxiliary base plate 2 is substantially equal. Therefore, it is only necessary to consider the overlap of the two sheets. However, when such an interval is used, as shown in FIG. 3, the tip end part overlaps with the other four sheets, resulting in a total of five sheets. Each blade comes to warp as it goes on.

  As a result, as the aperture ring 4 approaches the minimum aperture diameter control position, the load on the rotor 6 increases, and a step motor with a large driving force is required. Further, stagnation occurs between the blades, and deformation due to warpage of each blade is not constant, making it difficult to obtain an ideal aperture shape in a small aperture control region. Further, when the diaphragm ring 4 is started to rotate counterclockwise from the minimum diaphragm aperture control position as shown in FIG. 3, the so-called catching occurs due to the stagnation between the blades, and the operation start is unstable. It may become.

  Therefore, in order to eliminate these disadvantages, in the conventional mechanism, it is conceivable to increase the distance between the throttle ring 4 and the auxiliary base plate 2 so that a smooth operation can be obtained in a control region with a small throttle aperture. . However, if it does so, on the contrary, in the large aperture diameter control region, rattling of each blade 5 will become large. Therefore, conventionally, the driving force of the step motor has been increased. However, in the case of the present embodiment, as described above, the distance between the aperture ring 4 and the auxiliary base plate 2 is changed in accordance with the overlapping state of the six blades 5. Therefore, the cramped operation of the blades 5 in the control region with a small aperture is alleviated, and even if the blades 5 are warped, the load fluctuation can be minimized, so that the conventional method as described above The inconvenience in the configuration can be solved.

  Next, the second embodiment will be described with reference to FIGS. 5 to 8. FIG. 5 is a plan view of the second embodiment showing a control state of the maximum aperture diameter, and FIG. It is sectional drawing of a part. FIG. 7 is a plan view showing a control state of the minimum aperture diameter, and FIG. 8 is a cross-sectional view of a main part in the state of FIG. In addition, the structure of a present Example differs only in the part of the base plate 1, the auxiliary base plate 2, and the aperture ring 4 in Example 1. FIG. Therefore, in each drawing, the same code | symbol is attached | subjected to the substantially same member and site | part as Example 1, and description about them is abbreviate | omitted. 5 and 7, the rotor 6 and the reduction gear 7 shown in FIGS. 1 and 3 are not shown in order to make it easy to see the configuration of the main part of the present embodiment. . Further, in FIGS. 5 and 7, as in the case of FIG. 3 described above, the long hole 4a and the blade 5 of the aperture ring 4 and the hole 1h of the base plate 1 are related to one blade 5. Only the is marked.

  Therefore, a configuration different from the first embodiment will be described. First, the base plate 1 of the first embodiment intermittently forms the six wall portions 1b on the outer peripheral portion thereof, but in the present embodiment, the four wall portions 1b are intermittently formed. . Moreover, the base plate 1 of the present embodiment does not include the three tongue pieces 1g provided in the first embodiment. Others are the same as the case of the ground plane 1 of Example 1. Next, the auxiliary ground plate 2 of the present embodiment is formed by pressing three tongue pieces 2c having elasticity that are not provided in the auxiliary ground plate 2 of the first embodiment. Others are the same as the case of the auxiliary ground plane 2 of the first embodiment. In the case of the present embodiment, the tongue piece 2c is formed in this way, but it may be attached as a separate member, or it may be formed simultaneously with the auxiliary base plate 2 by a synthetic resin material. You may make it form with. Finally, the aperture ring 4 of the present embodiment does not form the two concave portions 4c formed in the first embodiment. The rest is the same as in the case of the aperture ring 4 of the first embodiment. As can be seen from such a configuration, in the case of the present embodiment, the diaphragm ring 4 is not attached to the base plate 1 but is pressed against the tongue piece 2c of the auxiliary base plate 2 so that its cam The surface 4d is merely brought into contact with the cam surface 1f of the main plate 1.

  Next, the operation of the present embodiment will be described. The operation is substantially the same as that of the first embodiment. Therefore, a brief description will be given. FIG. 5 shows a control state of the maximum aperture diameter in which the six blades 5 fully open the opening 2a. The cam surface 4d of the aperture ring 4 and the cam surface 1f of the base plate 1 are shown in FIG. As can be seen, the regions having high heights in the direction along the optical axis are in contact with each other, and the distance between the aperture ring 4 and the auxiliary base plate 2 is minimized. In the state shown in FIG. 5, when the aperture ring 4 is rotated clockwise by a rotor 6 (not shown), the six blades 5 are simultaneously rotated counterclockwise and cooperate to reduce the aperture diameter. And the relative contact relationship between the cam surface 4d and the cam surface 1f changes due to the elasticity of the tongue piece 2c, and the distance between the aperture ring 4 and the auxiliary base plate 2 increases.

  When the predetermined aperture size control position is reached, the rotor 6 stops and the rotation of the aperture ring 4 and the blades 5 also stops. However, in FIG. 7 and FIG. The state is shown in which the distance between the aperture ring 4 and the auxiliary base plate 2 is maximized after stopping at the aperture control position. In the state shown in FIG. 7, when the aperture ring 4 is rotated counterclockwise, the six blades 5 are simultaneously rotated clockwise to increase the aperture diameter. It is stopped or rotated to the state shown in FIGS. 5 and 6 and stopped. Although not described in order to avoid duplication, everything described in connection with the operation of the first embodiment is also incorporated in this embodiment.

In each of the above embodiments, each blade 5 is provided with the blade shaft 5a and the connecting pin 5b on the same surface. However, the present invention is not limited to such a configuration, and the blade 5 is provided on one surface. The shaft 5a may be provided, and the connecting pin 5b may be provided on the other surface. And when comprised in that way, the blade axis | shaft 5a will be fitted in the hole provided in the auxiliary | assistant ground plane 2. FIG. In addition, even when attached to the auxiliary base plate 2 as described above or when attached to the base plate 1 as in each of the above embodiments, the blade 5 is formed with a hole instead of the blade shaft 5a, and the hole is You may make it fit with respect to the attachment axis | shaft provided in the base plate 1 or the auxiliary | assistant base plate 2. FIG. Furthermore, in the case of each of the above embodiments, the connecting pin 5b is provided on the blade 5 and the cam-shaped long hole 4a is formed on the aperture ring 4, but as described in Patent Document 1, the aperture is reduced. A connection pin may be provided in the ring 4 and a long hole may be formed in the blade 5.

  In each of the above embodiments, the present invention is configured as a single diaphragm device. However, the present invention can also be configured as an aperture device unitized with the shutter device. In such a configuration, the base plate 1 and the auxiliary base plate 2 of the present embodiment are partitioned by an intermediate plate that is a thin plate member, and a diaphragm ring and diaphragm blades are arranged between the base plate 1 and the intermediate plate. It is known that a shutter blade is disposed between the intermediate plate and the auxiliary base plate 2. In that case, the second electromagnetic actuator is attached to the surface of the base plate 1 outside the blade chamber as a driving means for the shutter blade. Moreover, when employ | adopting the structure of said Example 2, the tongue piece 2c will be provided in an intermediate | middle board. Accordingly, the plate member of the present invention may be the auxiliary base plate 2 as in each of the above embodiments, or may be an intermediate plate in a diaphragm device unitized with the shutter device.

It is a top view of Example 1 which shows the control state of a maximum aperture diameter. FIG. 2A is a cross-sectional view of the main part in the state of FIG. 1, FIG. 2A shows the attachment position of the blade, and FIG. 2B shows the attachment position of the aperture ring. It is a top view of Example 1 which shows the control state of the minimum aperture diameter. FIG. 4A is a cross-sectional view of the main part in the state of FIG. 3, FIG. 4A shows the attachment position of the blade, and FIG. 4B shows the attachment position of the aperture ring. It is a top view of Example 2 which shows the control state of the largest aperture diameter. It is sectional drawing of the principal part in the state of FIG. It is a top view of Example 2 which shows the control state of the minimum aperture diameter. It is sectional drawing of the principal part in the state of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground plate 1a, 2a Opening part 1b Wall part 1c Projection part 1d 1st annular surface 1e 2nd annular surface 1f, 4d Cam surface 1g, 2c Tongue piece 1h Hole 1i, 1j Shaft 2 Auxiliary ground plate 2b Bending part 3 Screw 4 Restriction Ring 4a Long hole 4b Tooth part 4c Recessed part 5 Blade 5a Blade shaft 5b Connecting pin 6 Rotor 6a Output gear 7 Reduction gear

Claims (4)

A ground plane having a plurality of cam surfaces formed in a substantially arc shape around the optical axis as a slope having a height difference in a direction along the optical axis on a surface perpendicular to the optical axis on the blade chamber side, A plate member constituting the vane chamber between the main plate and the blade plate is disposed so as to be rotatable around the optical axis in the vane chamber so that the surface on the side of the main plate can be in contact with the cam surface of the main plate. The diaphragm ring has a plurality of cam surfaces formed in a substantially arc shape with the slope height direction reversed, and each blade is disposed between the diaphragm ring and the plate member. A part is overlapped between adjacent blades and is rotatably attached to the base plate or the plate member, and is connected to the aperture ring by a fitting configuration of a pin and a long hole. When the aperture ring rotates, the aperture diameter is cooperated And diaphragm blade comprising a plurality of vanes so as to reduction, the tip by its elasticity said provided as a plurality of tongues to the plane of the blade chamber side of the base plate or the plate member have elasticity Elastic means for pressing the diaphragm ring so that the cam surface of the diaphragm ring is always in contact with the cam surface of the main plate by always contacting the surface of the diaphragm ring on the plate member side ; And an electromagnetic drive means for reciprocatingly rotating the aperture ring, and when the aperture ring is at a minimum aperture diameter control position, the distance between the aperture ring and the plate member is maximized. A diaphragm device for a camera. The base plate or the plate member is made of a synthetic resin, and the plurality of tongue pieces are formed by simultaneous integral molding at the time of manufacturing the base plate or the plate member . Camera aperture device. The plurality of tongue pieces provided on the base plate are also a plurality of attachment pieces provided on the blade chamber side surface of the base plate in order to rotatably attach the diaphragm ring to the base plate. camera diaphragm device according to the in claim 1 or 2, characterized in the. The plate member is disposed between the ground plate and the auxiliary ground plate, constitutes another blade chamber between the ground plate and the auxiliary ground plate, and a shutter blade is disposed in the blade chamber, The camera diaphragm device according to any one of claims 1 to 3 , wherein the diaphragm device is configured as a unit together with the shutter device .

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