JP2016071279A - Blade driving device and imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade driving device advantageous for reduction in thickness and an imaging apparatus.SOLUTION: The blade driving device includes a blade 105 which enters and comes out of a light passing route, a driving ring 103 which drives the blade 105, and holding substrates (102 and 106) which rotatably hold the driving ring 103. The driving ring 103 is formed of an ultra-slim sheet-like member including an engagement part engaged with the blade 105. The driving ring 103 may be formed of the ultra-slim sheet-like member having a spring property or may be formed of the ultra-slim sheet-like member having a surface layer which is a slidability improvement layer on at least one surface of a sheet base material.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a blade driving device such as a diaphragm device and an imaging device such as a camera including the blade driving device.

  Conventionally, as a blade driving device for driving a blade, a ground plate having an opening for an optical path, a blade that is supported by the ground plate and operates to open and close the opening, and rotates with respect to the ground plate The thing provided with the drive ring is known (refer patent document 1).

  Such a blade drive device such as Patent Document 1 has a configuration in which the blade is operated so as to open and close the opening for the optical path by interlocking the blade with the rotating drive ring.

JP 2012-73383 A

  In recent years, in a blade drive device, further reduction in thickness has been desired due to various demands such as reduction in mounting space and cost reduction in an imaging device such as a camera.

  The present invention provides a blade driving device and an imaging device that are advantageous for thinning.

  The present invention includes a blade that enters and exits a light passage path, a drive ring that drives the blade, and a holding substrate that rotatably holds the drive ring, and the drive ring engages with the blade. The blade driving device is characterized by being formed from an ultra-thin sheet-like member having a joint. According to this aspect of the present invention, since the drive ring is formed from an ultra-thin sheet, it is effective for thinning in the light passing direction.

  In the blade drive device of the present invention, the drive ring is formed of the ultra-thin sheet-like member having spring characteristics. According to this aspect of the present invention, it is possible to improve the shape stability when the drive ring is not rotating (during driving standby) or rotating, and also contribute to improving the posture stability during rotation.

  In the blade drive device of the present invention, the drive ring is formed from the ultra-thin sheet-like member having a surface layer that is a slidability improving layer on at least one surface of a sheet base material. . According to this aspect of the present invention, the slidability between the drive ring and other members can be enhanced.

  In the blade drive device of the present invention, the drive ring is formed of the ultra-thin sheet-like member having a surface layer that is an antistatic layer on at least one surface of a sheet base material. According to this aspect of the present invention, it is possible to effectively prevent a decrease in driving performance due to charging between the driving ring and another member.

  In the blade driving device of the present invention, the surface layer is provided on both surfaces of the sheet base material, and each is provided with a substantially equal thickness. According to this aspect of the present invention, the flatness of the drive ring can be sufficiently ensured.

  In the blade drive device of the present invention, the drive ring is formed from the ultra-thin sheet-like member having a thickness less than half of the thickness of the holding substrate. According to this aspect of the present invention, the drive ring is formed by a sheet-like member that is extremely thin compared to the holding substrate, which is effective for further thinning.

  In the blade drive device of the present invention, the drive ring is formed of the ultra-thin sheet-like member that is thinner than the holding substrate and thicker than the blade. According to this aspect of the present invention, the drive ring is formed by the sheet-like member that is thinner than the holding substrate and thicker than the blades, which is effective for further thinning.

  In the blade drive device of the present invention, the drive ring is formed of the ultra-thin sheet-like member having a thickness substantially equal to or less than the thickness of the blade. According to this aspect of the present invention, the drive ring is formed by an extremely thin sheet-like member equal to or less than the blade, which is effective for further thinning.

  In the blade drive device of the present invention, the drive ring is held in a rotating posture by a plurality of support portions provided on the holding substrate. According to this aspect of the present invention, since the drive ring is stably supported at a plurality of positions of the holding substrate, a substantially flat rotation posture can be realized.

  In the blade driving device of the present invention, the holding substrate includes a first substrate disposed on one side of the drive ring and a second substrate disposed on the other surface of the drive ring. The drive ring is held in a rotating posture in a state where it can be driven in a drive space defined between the first substrate and the second substrate. According to this aspect of the present invention, since the drive ring is substantially sandwiched and supported between the first substrate and the second substrate that face each other, the rotational posture of the drive ring is further stabilized.

  In the blade drive device of the present invention, the blade is disposed between the drive ring and the first substrate, and the drive ring is driven in the drive space, so that the drive ring and the first substrate are driven. It travels only in the space between one substrate. According to this aspect of the present invention, it is possible to sufficiently secure the traveling space of the blades while maintaining the rotational posture of the drive ring.

  In the blade drive device of the present invention, the first substrate is provided with a first contact portion that contacts a portion of the one surface side of the drive ring other than the travel region where the blade travels. The second substrate is provided with a second abutting portion that abuts around the engaging portion with which the blade is engaged, on the other surface side of the driving ring, and the driving ring is provided with the first abutting portion. The rotating posture is maintained between the contact portion and the second contact portion. According to this aspect of the present invention, the rotation posture of the drive ring is stably held by partial contact by the contact portions provided on the first substrate and the second substrate without restricting the travel of the blades. can do.

  In the blade driving device of the present invention, an opening that forms part of the light passage path is provided through the second substrate, and a periphery of the opening is provided in the drive ring. And a restricting portion for restricting the movement of the drive ring in a direction orthogonal to the optical axis direction by contacting the inner peripheral surface of the through hole serving as the light passage path. According to this aspect of the present invention, the position of the surface direction of the drive ring with respect to the light passage path (the direction orthogonal to the optical axis direction) can be defined by the restriction portion of the second substrate.

  In the blade drive device of the present invention, an engagement protrusion that engages a through hole provided in the drive ring is provided on a surface on the drive ring side of the blade, and the blade out of the blade The surface on the first substrate side is provided with a cam groove engaging projection for engaging with a cam groove provided on the first substrate. According to such an aspect of the present invention, it is only necessary to provide the engagement protrusion that engages the blade with respect to the drive ring, so that the structure of the drive ring can be simplified.

  In the blade drive device of the present invention, a cam groove engaging protrusion that engages with a cam groove provided on the drive ring is formed on the surface of the blade on the drive ring side of the blade, and the second substrate. The rotation center shaft inserted into the provided insertion portion is provided so as to protrude. According to this aspect of the present invention, by providing the drive ring with the cam groove, the drive ring can be further reduced in weight, which is advantageous for high-speed drive of the drive ring.

  In the blade drive device of the present invention, a plurality of engagement protrusions that engage with the engagement holes or the engagement cam grooves of the blades are formed on separate surfaces on the blade-side surface of the drive ring. It is provided. According to such an aspect of the present invention, the drive ring is provided with a plurality of engaging projections from different members as a portion where the drive ring and the blade engage with each other. , Lightness, springiness, etc.) and functionality (rigidity, etc.) at the engaging portion can be optimized.

  In the blade drive device of the present invention, the blade is constituted by a plurality of blade groups arranged in an annular shape around an opening provided through the holding member. According to this aspect of the present invention, it is possible to easily reduce the thickness of a diaphragm device for narrowing a light passage path by interlocking a plurality of blade groups with a rotating drive ring.

  In the blade drive device of the present invention, a drive transmission member that transmits a drive force of the drive ring is connected to an outer peripheral portion of the drive ring. According to this aspect of the present invention, reliable drive transmission can be realized with a relatively simple configuration with respect to a drive ring made of an ultra-thin sheet-like member.

  In the blade drive device of the present invention, the drive transmission member is a pinion gear mounted on the rotation shaft of the drive motor, and the thickness of the drive ring is thinner than the height dimension of the pinion gear. It is characterized by. According to this aspect of the present invention, a reliable drive connection between the drive ring and the drive transmission member (pinion gear) can be realized.

  In the blade drive device of the present invention, the drive transmission member has a drive pin that turns as the drive motor rotates, and a portion of the drive transmission member other than the drive pin includes the drive ring. Another contact portion is provided for maintaining the rotational posture. According to this aspect of the present invention, it is possible to maintain the rotational posture of the drive ring while reliably performing the drive connection between the drive ring and the drive transmission member.

  In the blade drive device of the present invention, the drive ring has a through hole that forms at least a part of the light passage path, and a peripheral edge portion of the through hole on which the blade is engaged is It is characterized by being an R-shaped part. According to this aspect of the present invention, since the sliding portion with the blade is substantially reduced, the mobility of the blade is improved.

  Note that the present invention is not limited to the blade driving device described above, but can be applied to a blade driving system in an imaging device such as a camera, and is widely used in imaging devices.

  ADVANTAGE OF THE INVENTION According to this invention, the blade drive device and imaging device which are advantageous for thickness reduction are realizable.

1 is an exploded perspective view of a diaphragm device according to Embodiment 1 of the present invention. FIG. 3 is a perspective view of a base member used in the light amount adjustment device of the first embodiment. FIG. 3 is a perspective view of a drive ring used in the light amount adjustment device according to the first embodiment. FIG. 3 is a perspective view of a diaphragm blade used in the light amount adjusting device according to the first embodiment. The perspective view of the case member used for the light quantity adjustment apparatus of Embodiment 1. FIG. FIG. 3 is a cross-sectional view of the light amount adjusting device according to the first embodiment. FIG. 3 is an exploded view of the light amount adjusting device according to the first embodiment. FIG. 3 is an exploded view of the light amount adjusting device according to the first embodiment. The aperture shape of the light quantity adjusting device of Embodiment 1. The exploded view of the diaphragm | throttle device which concerns on Embodiment 2 of this invention. The perspective view of the arm member used for the light quantity adjustment apparatus of Embodiment 2. FIG. The arm member and drive ring which are used for the light quantity adjustment apparatus of Embodiment 2. Sectional drawing of the light quantity adjustment apparatus of Embodiment 2. FIG. FIG. 4 is an exploded view of a light amount adjustment device according to a second embodiment. The aperture shape of the light quantity adjusting device of Embodiment 2. The disassembled perspective view of the light quantity adjustment apparatus of Embodiment 3 of this invention. FIG. 10 is a perspective view of a drive ring of a light amount adjusting device according to a third embodiment. The drive ring side view of the light quantity adjustment apparatus of Embodiment 3. FIG. The aperture shape of the light quantity adjustment apparatus of Embodiment 3. Sectional drawing of the light quantity adjustment apparatus of Embodiment 3. FIG. FIG. 10 is a perspective view of a drive ring of a light amount adjusting device according to a third embodiment. The disassembled perspective view of the light quantity adjustment apparatus of Embodiment 4 of this invention. The pinion perspective view of the light quantity adjustment apparatus of Embodiment 4. The gear guide perspective view of the light quantity adjustment apparatus of Embodiment 4. FIG. FIG. 6 is an exploded view of a light amount adjustment device according to a fourth embodiment. Sectional drawing of the light quantity adjustment apparatus of Embodiment 4. FIG. The disassembled perspective view of the light quantity adjustment apparatus of Embodiment 5 of this invention. FIG. 10 is a perspective view of a drive ring of a light amount adjusting device according to a fifth embodiment. FIG. 10 is a perspective view of a drive ring base of a light amount adjusting device according to a fifth embodiment. Sectional drawing of the light quantity adjustment apparatus of Embodiment 5. FIG. Sectional drawing 1 of the drive ring of the light quantity adjustment apparatus of Embodiment 5. FIG. Sectional drawing of the base in the drive ring of the light quantity adjustment apparatus of Embodiment 5. FIG. 10 is a drive pin in a drive ring of a light amount adjusting device according to a fifth embodiment. 10 is a drive pin in a drive ring of a light amount adjusting device according to a fifth embodiment. The drive ring perspective view of the light quantity adjustment apparatus of Embodiment 6 of this invention. FIG. 10 is a perspective view of a drive ring base of a light amount adjusting device according to a sixth embodiment. FIG. 10 is a cross-sectional view of a drive ring of a light amount adjusting device according to a sixth embodiment. Sectional drawing of the base in the drive ring of the light quantity adjustment apparatus of Embodiment 6. FIG. FIG. 14 is a drive pin in a drive ring of a light amount adjusting device of Embodiment 6. FIG. The disassembled perspective view of the aperture_diaphragm | restriction apparatus which concerns on Embodiment 7 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Embodiment 1>
FIG. 1 shows an exploded perspective view of a diaphragm device as a light amount adjusting device which is an example of a blade driving device according to the first embodiment of the present invention.

  In FIG. 1, reference numeral 102 denotes a base member 102 having an opening at the center. FIG. 2 is a perspective view of the base member 102. The base member 102 includes rails 102a1, 102a2, 102a3, 102a4 that serve as a plurality of support portions that support a drive ring 103a, which will be described later, and an engagement portion 102b. The base member 102 is created by resin molding. The drive unit 101 is attached to the base member 102. The drive unit 101 uses, for example, a stepping motor, a galvano motor, or the like. A pinion 104 is attached to the rotation shaft 101 a of the drive unit 101.

  FIG. 3 is a perspective view of the drive ring 103. The drive ring 103 has a through hole that constitutes at least a part of the light passage path, and is formed from an annular sheet-like member (endless ring-like member) that surrounds a path (light passage path) through which light passes, It rotates around the light passage path. The drive ring 103 is engaged with a blade described later. In other words, the drive ring is configured to be interlocked so that the blade enters and exits the light passage path as the drive ring rotates, and thus becomes a member (power transmission member) for driving the blade. . The drive ring 103 includes a base portion 103a, an inner engagement portion 103b, a drive hole 103c, and a driven portion 103d. By making the base portion 103a have a substantially uniform thickness, it is difficult to be affected by air resistance during rotation of the drive ring, so that the operating load can be reduced, and high-speed response and quietness can be improved.

  The drive ring 103 is created by resin molding. Further, for example, it is created by pressing a resin film (PET sheet material or the like). When press working can be performed, the shape accuracy can be formed with higher accuracy than the shape accuracy of resin molding, so that the drawing accuracy can be high. Here, when the drive ring 103 is manufactured by pressing a sheet, the radially inner inner edge portion (the inner edge portion of the through hole) and the radially outer outer edge portion of the drive ring 103 extend over the outer periphery. An R-shaped portion is provided. Since the R-shaped portion is tapered such that the thickness thereof becomes substantially thinner as the edge portion, the edge portion defines the shape of the opening of the drive ring 103. The drive ring 103 according to this embodiment is incorporated in the diaphragm device so that the R-shaped portion faces the blade side. Thereby, since the sliding part with a blade | wing, especially the sliding part in the inner peripheral part of the inner edge part side of the drive ring 103 decreases substantially, the mobility of a blade | wing improves. Such an R-shaped portion may be provided only at the inner edge portion of the drive ring 103 or may be provided only at the outer edge portion.

  As the thickness of the resin film, a material having a thickness of 0.03 mm to 0.30 mm can be used. By making the base 103a as thin as possible, the inertia during rotation can be reduced, and the diaphragm device can be operated at high speed. The drive ring 103 is supported by the base member 102 and the case member 106 so as to be optimally movable in both the thrust direction and the radial direction, so that deformation of the drive ring 103a is minimized even if the base portion 103a is thinned.

  The base 103a of the drive ring 103 may be made of a material that has been surface-treated on one side or both sides. Examples of the surface treatment include sliding coating, antistatic treatment, and antireflection treatment. By sliding coating, friction with the base member 102, which is a component that slides with the drive ring, a diaphragm blade 105 and a case member 106, which will be described later, can be reduced, and power-saving operation is possible. In addition, by performing antireflection treatment, it is possible to suppress the reflection of light entering the light amount adjusting device and prevent the occurrence of ghost, flare, etc. when the light amount adjusting device is incorporated in the lens barrel. it can.

  The inner engagement portion 103 b of the drive ring 103 is engaged with the engagement portion 102 a of the base member 102. The engaging portion 102a of the base member 102 may have a circular shape serving as a rotation center. In the first embodiment, the engaging portion 102 a is composed of a plurality of convex portions and engages with the inner engaging portion 103 b of the drive ring 103. The drive ring 103 and the base member 102 are engaged with each other so that the drive ring 103 is outside and the base member 102 is inside. With this relationship, since the inner engagement portion 103b of the drive ring 103a is supported by the engagement portion 102a of the base member 102, the drive ring 103 can suppress deformation in the circumferential direction. Therefore, even if the base portion 103a of the drive ring 103 is thin, it can operate without being deformed.

  Since the radial engagement length between the drive ring 103 and the base member 102 can be reduced to the thickness (0.03 mm to 0.3 mm) of the base portion 103a of the drive ring 103, the frictional resistance can be reduced and smooth. Operation and low power operation.

  Further, the drive ring 103 has a gear portion which is a driven portion 103d. The driven portion 103 d is engaged with the pinion 104. The rotational force generated in the drive unit 101 is transmitted from the pinion 104 to the driven unit 103d, and the drive ring 103 rotates. In the meshing between the gear 103d of the drive ring 103 and the gear of the pinion 104, the gear 103d is thin and the meshing area of the gear is small, so that the meshing sound between the gears is small. Further, since the mass difference between the pinion 104 and the drive ring 103 is large, even if the pinion 104 has a backlash in the gear portion 103d, the gear meshing sound, the reversing sound, etc. are reduced.

  Here, the drive ring 103 of the present embodiment will be described in more detail. The drive ring 103 in the present embodiment is formed of an ultra-thin sheet-like member having a structure that engages with a diaphragm blade 105 described later.

  As this “ultra-thin sheet-like member”, for example, a sheet that is thinner than the holding substrate (base member 102, case member 106) that holds the drive ring 103, or a sheet that has a thickness less than half of the holding substrate, or When compared with the thickness of the blade, it is possible to use a sheet that is slightly thicker than the thickness of the blade, or a sheet having a thickness substantially equal to or less than the thickness of the blade. This is effective in achieving

  In addition, the “ultra-thin sheet-like member” of the present embodiment has a thickness (thinness) that can be bent and deformed relatively easily, for example, by applying a slight physical stress from the outside. And it is preferable that it is a very thin sheet-like member from a viewpoint of thickness reduction or weight reduction. Further, the “ultra-thin sheet-like member” preferably has a spring characteristic that has a repulsive force against deformation such as a leaf spring alone. As a result, the shape stability can be sufficiently ensured before or during the rotation drive, and a stable flat rotation posture can be ensured. Therefore, the drive ring 103 in the present embodiment is preferably formed from an ultra-thin sheet-like member having spring characteristics.

  In addition, the “ultra-thin sheet-like member” of the present embodiment may be provided with a slidability improving layer by sliding coating or the like as a surface layer on at least one surface of a resin or metal sheet base material, for example. In addition, an antistatic layer for antistatic may be provided, an antireflective layer for antireflection may be provided, or a sheet-like shape in which these various surface layers are provided on both sides of the sheet substrate. It is preferable to use a member. Thereby, when a slidability improvement layer is provided, the slidability etc. between a blade | wing and another member can be improved. Further, when the antistatic layer is provided, sticking between the blade and the drive ring 103 due to charging can be prevented. In addition, when an antireflection layer is provided, reflection of light that has entered the light amount adjusting device is suppressed, and ghost flare or the like is prevented when the light adjusting device is incorporated in the lens barrel. Can do. The surface layer such as the slidability improving layer can be provided on the outer peripheral end surface (inner diameter end surface or outer diameter end surface, or both) of the sheet base material to increase the rigidity of the sheet base material. Slidability can be sufficiently enhanced. Such a surface layer includes, for example, a thin film formed by painting a material with good slidability and various film forming techniques. In addition, considering the internal stress of the sheet base material, it is possible to effectively prevent warpage and deformation by adjusting the stress balance of the entire ultra-thin sheet-like member using a film such as tensile stress or compressive stress. is there. The surface layer preferably has substantially the same thickness on both sides. For example, when the heat shrinkage rate of the “ultra-thin sheet-like member” and the heat shrinkage rate of the surface treatment layer are different, the “ultra-thin sheet-like member” applies the same stress (tensile stress, compression stress) from the front and back. Therefore, even if the environment changes, the “ultra-thin sheet-like member” can effectively prevent warping and deformation.

  Further, the drive ring 103 in the present embodiment is completely different from a conventional drive ring (resin-molded relatively thick drive ring). Here, for example, when compared with the conventional drive ring only in the thickness dimension, the conventional drive ring is a thin type of about 0.5 mm, whereas the thickness of the drive ring 103 of this embodiment is about Is, for example, preferably about 0.3 mm or less, more preferably about 0.2 mm or less, and more preferably about 0.1 mm or less.

  When such an ultra-thin sheet-like member is used for the drive ring 103, it contributes not only to the thinning of the drive ring 103 but also to the weight reduction of the drive ring 103, and further high-speed rotation can be realized. Note that the ultra-thin sheet-like member may have a single-layer structure or a multilayer structure.

  For example, in the case of a multilayer structure, a resin sheet such as a resin film may be used as a base material, or a metal sheet such as a metal foil or a thin metal plate may be used as a base material. When using a resin sheet, it is very effective in reducing the weight. On the other hand, when a metal sheet is used, posture stability during rotation can be improved.

  In the case of using a metal sheet, it is very effective to use an ultralight metal such as geralumin for high speed rotation. In the case of using a resin sheet or a metal sheet, these may be applied alone to the drive ring 103 to form a one-layer structure. However, sliding properties with blades and other members, operating loads, friction, high speed In consideration of physical interference such as responsiveness and quietness, it is preferable to form the surface layer by surface treatment (treatment including surface coating) for providing various functions.

  In particular, the drive ring 103 is preferably flat throughout because of rotational driving, but it is necessary to provide an engaging portion with the blade. For this reason, it is preferable to implement | achieve an engagement part with a blade | wing with the minimum structure in consideration of various factors, such as air resistance and sufficient engagement, for example. The drive ring 103 may be formed using the same material as that for forming the blades. In this case, the blade and the drive ring 103 have the same thickness.

  Reference numeral 103e denotes a light shielding portion. By entering and exiting the slit of the photo interrupter 107, it functions as a sensor. Used for initialization of the light quantity control device.

  FIG. 4 is a perspective view of the diaphragm blade 105. A drive pin 105a and a cam pin 105b are attached to the blade portion 105c. The diaphragm blade 105 may be formed integrally with the blade portion 105c, the drive pin 105a, and the cam pin 105b by resin molding.

  Alternatively, the blade portion 105c may be formed by a light-shielded sheet member, and the drive pin 105a and the cam pin 105b may be formed by resin molding and integrated with the blade portion 105c by bonding, welding, outsert molding, or the like. Alternatively, the drive pin 105a and the cam pin 105b may be formed of metal pins and integrated with the blade portion 105c by bonding, welding, caulking, or the like.

  FIG. 5 shows the case member 106. The case member 106 has a rail 106a1 and a rail 106a2 that serve as a plurality of support portions (contact portions) that support the drive ring 103a, and a plurality of cams (cam grooves) 106b. The drive ring 103 a and the diaphragm blade 105 are driven in the space formed by the base member 102 and the case member 106.

  A drive pin 105 a serving as the rotation center axis of the diaphragm blade 105 engages with the drive hole 103 c of the drive ring 103. The pinion 4 rotates, a force is applied to the driven part 103d of the drive ring 103, and the drive ring 103 rotates. When the drive ring 103 rotates, a driving force is applied to the drive pin 105a of the diaphragm blade 105 from the engagement hole 103c of the drive ring 103, and the diaphragm blade 105 is driven. A cam pin 105 b of the diaphragm blade 105 is engaged with a cam 106 b formed on the case 106. With the cam 106b, the aperture blade 105a moves in and out of the opening of the base member 102. The aperture shape can be adjusted by the plurality of aperture blades 105a.

  Since the base portion 103a of the drive ring 103 has a substantially uniform thickness and has no useless irregularities or holes, it is possible to prevent an operation failure such that the diaphragm blade 105 is caught with the drive ring 103 during the opening / closing operation.

  FIG. 6 is a cross-sectional view of the light amount adjusting device of the first embodiment. FIG. 7 is an exploded view seen from the case member 106 side. FIG. 8 is an exploded view seen from the base member 102 side. The drive ring 103 is rotatably supported by rails 102a1, 102a2, 102a3 and 102a4 formed on the base member 102. Since the drive ring 103 is supported by the rail of the base member, the drive ring 103 and the base member 102 do not adhere to each other on the surface, and sticking of the drive ring due to charging or the like can be prevented.

  Further, the drive ring 103 applies a load to the engagement hole 103 a engaged with the aperture blade 105. In particular, in the small aperture state, the aperture blades are knitted together, so that a large load is applied to the engagement hole 103a serving as a support portion of the aperture blade 105. Therefore, the drive ring 103 tends to deform in the direction of the base member 102. The rails 102 a 1 and 102 a 2 formed on the base member 102 support the vicinity of the drive hole 103 c of the drive ring 103. The rail 102a1 supports the inner side in the radial direction of the drive hole 103c. The rail 102a2 supports the radially outer side of the drive hole 103a. That is, the base member 102 is provided with a rail 102a2 that abuts around a drive hole (engagement portion) 103c with which the diaphragm blade 105 is engaged in the drive ring 103. With these rails, deformation of the drive ring 103 can be suppressed even if the base portion 103a is thin or a force is applied to the drive hole 103c or the like. When the strength of the base 103a is sufficient, the drive ring 103 may be supported by only one of the rail 102a1 or the rail 102a2. In the first embodiment, the rails 102a1 and 102a2 are connected on the circumference, but the same effect can be obtained by supporting the drive ring 103 with a plurality of hemispherical convex portions.

  Next, the rail 102a4 formed on the base member 102 will be described. The rail 102 a 4 is a rail that supports the periphery of the driven part 103 d of the drive ring 103. The pinion 104 and the driven portion 103d of the drive ring 103 transmit force by gear engagement. By supporting the driven portion 103d with the rail 102a4, the driving ring 103 can be prevented from being deformed even if the base portion 103a is thin or a force is applied to the driven portion 103d. The rail 102a4 is a circular rail, but the same effect can be obtained by supporting the drive ring 103 with a plurality of hemispherical convex portions or the like.

  The rail 102a3 formed on the base member 102 is a rail added as a reinforcement between the rails 102a1, 102a2, and 102a4 described above. A large load is applied to the driven portion 103d and the driving portion 103c in the driving ring 103. By supporting the portion between the driven portion 103d and the driving portion 103c with the rail 102a3, it is possible to suppress the deformation of the driving ring 103. The rail 102a3 is also an arc rail, but the same effect can be obtained by supporting the drive ring 103 with a plurality of hemispherical convex portions or the like.

  If the base 103a of the drive ring 103 has sufficient strength, the rails 102a1, 102a2, 102a3, 102a4 may be appropriately reduced. Further, when the strength of the drive ring 103 is extremely weak, a rail may be added.

  Next, the support on the aperture blade side of the drive ring 103 will be described. As shown in FIG. 8, the plurality of diaphragm blades 105 are uniformly arranged in the circumferential direction. Therefore, the drive ring 103 is not partially supported by the plurality of aperture blades 105 but is supported evenly as a whole. In this embodiment, as shown in FIG. 9, the size of the light passage opening can be varied by interlocking the plurality of diaphragm blades 105 by the rotation of the drive ring 103.

  Therefore, a large force is not applied to the drive ring 103 partially, and the force is dispersed as a whole. Therefore, even if the drive ring 103 is thin, stable driving can be realized without deformation. . Here, in order to reduce the frictional resistance between the drive ring 103 and the diaphragm blade 105, an emboss shape may be formed on the sliding surface of the drive ring 103 and the diaphragm blade 105. The emboss shape may be formed on either the drive ring 103 or the diaphragm blade 105.

  The second support method on the diaphragm blade side of the drive ring 103 will be described. A base portion 103 a of the drive ring 103 is supported by a rail 106 a 1 formed on the case member 106. In the drawing, the plurality of rails 106a1 have a circumferential shape, but the drive ring 103 may be supported by a plurality of hemispherical convex portions.

  The support method on the diaphragm blade side of the drive ring 103 has been described in terms of the support by the diaphragm blade 105 and the support by the rail 106a1 of the case member 106, but they may be used together or only one of them may be used.

  The rail 106a2 formed on the case member 106 will be described. The rail 106 a 2 is a rail that supports the periphery of the driven part 103 d of the drive ring 103. The pinion 104 and the driven portion 103d of the drive ring 103 transmit force by gear engagement. By supporting the driven portion 103d with the rail 106a2, the driving ring 103 can be prevented from being deformed even when the base portion 103a is thin or a force is applied to the driven portion 103d. The rail 106a2 is a circular rail, but the same effect can be obtained by supporting the drive ring 103 with a plurality of hemispherical convex portions or the like.

  As described above, the drive ring 103 is appropriately supported by the base member 102, the case member 106, and the diaphragm blade 105, so that the drive ring 103 operates at high speed and operates silently without being deformed even if it is configured by the thin base portion 103a. It is possible.

<Embodiment 2>
In FIG. 10, the disassembled perspective view of the aperture_diaphragm | restriction apparatus as the light quantity adjustment apparatus which is Embodiment 2 of this invention is shown.

In FIG. 10, reference numeral 202 denotes a base member 202 having an opening at the center.
The base member 202 has rails 202a1 and 202a2 and an engaging portion 202b. The base member 202 is created by resin molding. The drive unit 201 is attached to the base member 202. The driving unit 201 uses, for example, a stepping motor, a galvano motor, or the like. A drive arm 204 is attached to the rotation shaft 201 a of the drive unit 201.

  FIG. 11 is a perspective view of the drive arm 204. The drive arm 204 has a drive pin 204d and a support portion 204a.

  Reference numeral 203 denotes a drive ring. The drive ring 203 includes a base portion 203a, an inner engagement portion 203b, a drive hole 203c, and a driven portion 203d. By setting the base portion 203a to have a uniform thickness, it is difficult to be affected by the air resistance during rotation of the drive ring, so that the operating load can be reduced, and high-speed response and quietness can be improved. The drive ring 203 is created by resin molding. Further, for example, it is created by pressing a resin film (PET sheet material or the like). When press working can be performed, the shape accuracy can be formed with higher accuracy than the shape accuracy of resin molding, so that the drawing accuracy can be high.

  As the thickness of the resin film, a material having a thickness of 0.03 mm to 0.30 mm can be used. By making the base portion 203a as thin as possible, the inertia during rotation can be reduced, and the aperture device can be operated at high speed.

  The drive ring 203 is supported by the base member 202 and the case member 206 so as to be optimally movable in both the thrust direction and the radial direction, thereby suppressing the deformation of the drive ring 203a to a minimum even if the base portion 203a is thinned.

  The base 203a of the drive ring 203 may be made of a material that has been surface-treated on one or both sides. Examples of the surface treatment include sliding coating, antistatic treatment, and antireflection treatment. By sliding coating, friction with the base member 202, which is a part that slides with the drive ring, the diaphragm blade 205 and the case member 206, which will be described later, can be reduced, and power-saving operation becomes possible. . In addition, by performing antireflection treatment, it is possible to suppress the reflection of light entering the light amount adjusting device and prevent the occurrence of ghost, flare, etc. when the light amount adjusting device is incorporated in the lens barrel. it can.

  The inner engagement portion 203 b of the drive ring 203 is engaged with the engagement portion 202 a of the base member 202. The engaging portion 202a of the base member 202 may have a circular shape serving as a rotation center. In the second embodiment, the engaging portion 202 a is configured by a plurality of convex portions, and engages with the inner engaging portion 203 b of the drive ring 203. The drive ring 203 and the base member 202 are engaged with each other so that the drive ring 203 is outside and the base member 202 is inside. With this relationship, since the inner engagement portion 203b of the drive ring 203a is supported by the engagement portion 202a of the base member 202, the drive ring 203 can suppress deformation in the circumferential direction. Therefore, even if the base portion 203a of the drive ring 203 is thin, it can operate without being deformed.

  Since the radial engagement length between the drive ring 103 and the base member 102 can be reduced to the thickness (0.03 mm to 0.3 mm) of the base 203a of the drive ring 203, the frictional resistance can be reduced and smooth. Operation and low power operation.

  Further, the drive ring 203 has a groove portion that is a driven portion 203d. The driven portion 203 d is engaged with the drive arm 204. The drive arm 204 is rotated by the drive unit 201, force is transmitted from the movable pin 204 d of the drive arm 204 to the driven unit 203 d of the drive ring 203, and the drive ring 203 is rotated. Since the movable pin 204d and the driven portion 203d are driven in a state where they are always in contact with each other, no sound is generated due to the contact and separation of components. Therefore, it can be operated with a very quiet sound.

  In addition, the engagement length between the movable pin 204d of the drive arm 204 and the driven portion 203d of the drive ring 203 is as short as the thickness of the drive ring (0.03 mm to 0.3 mm), so the frictional resistance is small. Therefore, stable driving is possible.

  The diaphragm blade 205 is the same as the diaphragm blade 105 described in the first embodiment. The case member 206 is the same as the case member 106 described in the first embodiment.

  The drive ring 203 and the diaphragm blade 205 are driven in the space formed by the base member 202 and the case member 206.

  The drive pin 205 a of the diaphragm blade 205 is engaged with the drive hole 203 c of the drive ring 203. The drive arm 204 rotates, a force is applied to the driven part 203d of the drive ring 203, and the drive ring 203 rotates. When the drive ring 203 rotates, a driving force is applied to the drive pin 205a of the diaphragm blade 205 from the engagement hole 203c of the drive ring 203, and the diaphragm blade 205 is driven. A cam pin 205 b of the diaphragm blade 205 is engaged with a cam 206 b formed on the case 206. The diaphragm blade 205a moves in and out of the opening of the base member 202 by the cam 206b. The aperture shape can be adjusted by the plurality of aperture blades 205a.

  Since the base portion 203a of the drive ring 203 has a uniform thickness and is free of unnecessary irregularities and holes, it is possible to prevent an operation failure such that the diaphragm blade 105 catches the drive ring 203 during the opening / closing operation.

  FIG. 12 is a view showing the engagement between the drive ring 203 and the drive arm 204. A support portion 204 a formed on the drive arm 204 supports the periphery of the driven portion 203 d of the drive ring 203.

  FIG. 13 is a cross-sectional view of the light amount adjusting device of the second embodiment. The drive ring 203 is rotatably supported by rails 202 a 1 and 202 a 2 formed on the base member 202 and 204 a formed on the drive arm 204. Since the drive ring 203 is supported by the rail of the base member, the drive ring 203 and the base member 202 do not adhere to each other on the surface, so that sticking of the drive ring due to charging or the like can be prevented.

  In addition, the drive ring 203 applies a load to the engagement hole 203 a engaged with the aperture blade 205. In particular, in the small aperture state, the aperture blades are knitted together, so that a large load is applied to the engagement hole 203a serving as a support portion of the aperture blade 205. Therefore, the drive ring 203 tends to deform in the direction of the base member 202. The rails 202 a 1 and 202 a 2 formed on the base member support the vicinity of the drive hole 203 c of the drive ring 203. The rail 202a1 supports the inside of the drive hole 203c. The rail 202a2 supports the outside of the drive hole 203a. With these rails, deformation of the drive ring 203 can be suppressed even when the base portion 203a is thin or a force is applied to the drive hole 203c. When the strength of the base 203a is sufficient, the drive ring 203 may be supported by only one of the rail 202a1 or the rail 202a2. In the second embodiment, the rails 202a1 and 202a2 are connected on the circumference, but the same effect can be obtained by supporting the drive ring 103 with a plurality of hemispherical convex portions.

  Next, the support part 204d formed on the drive arm 204 will be described. The rail 204 d is a rail that supports the periphery of the driven part 203 d of the drive ring 203. The movable pin 204a of the drive arm 204 and the driven portion 203d of the drive ring 203 transmit force to the drive ring 203 as the drive arm 204 rotates. By supporting the driven portion 203d by the support portion 204d, the driving ring 203 can be prevented from being deformed even if the base portion 203a is thin or a force is applied to the driven portion 203d. The support portion 204d is an arc rail, but the same effect can be obtained even if the drive ring 203 is supported by a plurality of hemispherical convex portions or the like.

  When the base 203a of the drive ring 203 has sufficient strength, the rails 202a1, 202a2 and the support portion 204d may be appropriately reduced. Further, when the strength of the drive ring 203 is extremely weak, a rail may be added.

  Next, the support on the diaphragm blade side of the drive ring 203 will be described. As shown in FIGS. 14 and 15, the plurality of diaphragm blades 205 are uniformly arranged in the circumferential direction, and the size of the light passage opening can be adjusted by the plurality of diaphragm blades 205 as the drive ring 203 rotates. It becomes possible. Further, the drive ring 203 is not partially supported by the plurality of diaphragm blades 205 but is supported evenly as a whole. Therefore, a large force is not applied to the drive ring 203 partially, and the force is dispersed as a whole. Therefore, even if the drive ring 203 is thin, stable driving can be realized without deformation. . Here, in order to reduce the frictional resistance between the drive ring 203 and the diaphragm blade 205, an emboss shape may be formed on the sliding surface of the drive ring 203 and the diaphragm blade 205. The emboss shape may be formed on either the drive ring 203 or the diaphragm blade 205.

  A second support method on the diaphragm blade side of the drive ring 203 will be described. A base portion 203a of the drive ring 203 is supported by rails 206a1 formed on the case member 206. In the drawing, the plurality of rails 206a1 have a circumferential shape, but the drive ring 203 may be supported by a plurality of hemispherical convex portions or the like.

  The support method on the diaphragm blade side of the drive ring 203 has been described in two ways: support by the diaphragm blade 205 and support by the rail 206a1 of the case member 206, but they may be used together or only one of them may be used.

  The rail 206a2 formed on the case member 206 will be described. The rail 206a2 is a rail that supports the periphery of the driven portion 203d of the drive ring 203. In the driven portion 203 d of the drive arm 204 and the drive ring 203, force is transmitted to the drive ring 203 as the drive arm 204 rotates. By supporting the driven part 203d with the rail 206a2, the driving ring 203 can be prevented from being deformed even if the base part 203a is thin or a force is applied to the driven part 203d. The rail 206a2 is a circular arc rail, but the same effect can be obtained by supporting the drive ring 203 with a plurality of hemispherical convex portions or the like.

  As described above, the drive ring 203 is appropriately supported by the base member 202, the case member 206, and the diaphragm blade 205, so that the drive ring 203 operates at high speed and operates silently without being deformed even if it is configured by the thin base 203a. It is possible.

<Embodiment 3>
FIG. 16 is an exploded perspective view of a diaphragm device as a light amount adjusting device according to the third embodiment of the present invention.

In FIG. 16, reference numeral 302 denotes a base member 302 having an opening at the center.
The base member 102 has rails 302a1 and 302a2 and an engaging portion 302b. The base member 302 is created by resin molding. The drive unit 301 is attached to the base member 302. The drive unit 301 uses, for example, a stepping motor, a galvano motor, or the like. A pinion 304 is attached to the rotation shaft 301 a of the drive unit 301.

  FIG. 17 is a perspective view of the drive ring 303. The drive ring 303 includes a base portion 303a, an inner engagement portion 303b, a drive pin 303c, a driven portion 303e, and a light shielding portion 303f. By setting the base portion 303a to have a uniform thickness, it is difficult to be affected by air resistance during rotation of the drive ring, so that the operating load can be reduced, and high-speed response and quietness can be improved. The drive ring 303 is created by resin molding. Further, for example, it is created by pressing a resin film (PET sheet material or the like). When press working can be performed, the shape accuracy can be formed with higher accuracy than the shape accuracy of resin molding, so that the drawing accuracy can be high.

  As the thickness of the resin film, a material having a thickness of 0.03 mm to 0.30 mm can be used. By making the base portion 303a as thin as possible, the inertia when rotating can be reduced, and the diaphragm device can be operated at high speed.

  The drive ring 303 is supported by the base member 302 and the case member 306 so as to be optimally movable in both the thrust direction and the radial direction, thereby suppressing the deformation of the drive ring 303 to a minimum even when the base portion 303a is thinned.

  The base 303a of the drive ring 303 may be made of a material that has been surface-treated on one or both sides. Examples of the surface treatment include sliding coating, antistatic treatment, and antireflection treatment. By sliding coating, friction with the base member 302, which is a part that slides with the drive ring, the diaphragm blades 305 and the case member 306, which will be described later, can be reduced, and power-saving operation is possible. . In addition, by performing antireflection treatment, it is possible to suppress the reflection of light entering the light amount adjusting device and prevent the occurrence of ghost, flare, etc. when the light amount adjusting device is incorporated in the lens barrel. it can.

  The inner engagement portion 303 b of the drive ring 303 engages with the engagement portion 302 a of the base member 302. The engagement portion 302a of the base member 302 may have a circular shape that serves as a rotation center. In the third embodiment, the engaging portion 302 a is configured by a plurality of convex portions and engages with the inner engaging portion 303 b of the drive ring 303. The drive ring 303 and the base member 302 are engaged with each other so that the drive ring 303 is outside and the base member 302 is inside. With this relationship, since the inner engagement portion 303b of the drive ring 303a is supported by the engagement portion 302a of the base member 302, the drive ring 303 can suppress deformation in the circumferential direction. Therefore, even if the base portion 303a of the drive ring 303 is thin, it can operate without being deformed.

  Since the radial engagement length of the drive ring 303 and the base member 302 can be reduced to the thickness (0.03 mm to 0.3 mm) of the base portion 303a of the drive ring 303, the frictional resistance can be reduced and smooth. Operation and low power operation.

  Further, the drive ring 303 has a gear portion which is a driven portion 303d. The driven portion 303e meshes with the pinion 304. The rotational force generated in the drive unit 301 is transmitted from the pinion 304 to the driven unit 303e, and the drive ring 303 rotates. In the meshing of the gear portion 303e of the drive ring 303 and the gear of the pinion 304, the gear portion 303e is thin and the meshing area of the gear is small, so that the meshing sound between the gears is small. Further, since the mass difference between the pinion 304 and the drive ring 303 is large, even if the pinion 304 has a backlash in the gear portion 303e, the gear meshing sound, the reversing sound, etc. are reduced.

  Reference numeral 303f denotes a light shielding portion. By entering and exiting the slit of the photo interrupter 307, it functions as a sensor. Used to detect the initial position of the light quantity control device.

  Reference numeral 305 denotes a diaphragm blade. The aperture blade 305 is formed with an engagement hole 305c and a cam groove 305d which are driven parts. The aperture blade 305 is created by, for example, pressing a PET sheet material or the like.

  Reference numeral 306 denotes a case member. The case member 306 has a rail 306a. The drive ring 303 and the diaphragm blade 305 are driven in the space formed by the base member 302 and the case member 306.

  The engagement hole 305 c of the diaphragm blade 305 engages with the drive hole 303 c of the drive ring 303. The pinion 304 rotates, a force is applied to the driven portion 303e of the drive ring 303, and the drive ring 303 rotates. When the drive ring 303 rotates, a driving force is applied from the drive pin 303c of the drive ring 303 to the engagement hole 305c of the diaphragm blade 305, and the diaphragm blade 305 is driven. The cam groove 305d of the diaphragm blade 305 is engaged with the cam pin 302d of the base member. Therefore, the aperture blade 305 enters and exits the opening of the base member 302 by the cam groove 305d. The aperture shape can be adjusted by the plurality of aperture blades 305.

  Since the base portion 303a of the drive ring 303 has a uniform thickness and is free of unnecessary irregularities and holes, it is possible to prevent an operation failure such that the diaphragm blade 305 catches the drive ring 303 during the opening / closing operation.

  FIG. 20 is a cross-sectional view of the light amount adjusting device of the third embodiment. The drive ring 303 is rotatably supported by rails 302a1 and 302a2 formed on the base member 302. Since the drive ring 303 is supported by the rail of the base member, the drive ring 303 and the base member 302 are not in close contact with each other, so that sticking of the drive ring due to charging or the like can be prevented.

  Further, the drive ring 303 places a load on the movable pin 303c portion engaged with the aperture blade 305. In particular, in the small aperture state, the aperture blades are knitted, so that a large load is applied to the movable pin 303c which is a support portion of the aperture blade 305. Therefore, the drive ring 303 tends to deform in the direction of the base member 302. A rail 302 a 1 formed on the base member supports the vicinity of the movable pin 303 c of the drive ring 303. With these rails, deformation of the drive ring 303 can be suppressed even if the base portion 303a is thin or a force is applied to the drive pin 393c. In the third embodiment, the rails 302a1 are each formed by a plurality of semicircular convex portions or the like, but the same effect can be obtained even with rails connected on the circumference. The drive pin 303c of the drive ring 303 can be integrally formed by outsert molding. For example, as shown in FIG. 21, the gear portion 303e is integrally formed by outsert molding. It may be formed. Thereby, it becomes possible to adjust the rigidity (strength) of the gear part 303e suitably.

  Next, the rail 302a2 formed on the base member 302 will be described. The rail 302a2 is a rail that supports the periphery of the driven portion 303e of the drive ring 303. The pinion 304 and the driven portion 303e of the drive ring 303 transmit force by gear engagement. By supporting the driven portion 303e with the rail 302a2, the driving ring 303 can suppress deformation even if the base portion 303a is thin or a force is applied to the driven portion 303e. The rail 302a2 is a circular rail, but the same effect can be obtained by supporting the drive ring 303 with a plurality of hemispherical convex portions or the like.

  If the base 303a of the drive ring 303 has sufficient strength, the rails 302a1 and 302a2 may be appropriately reduced. Further, when the strength of the drive ring 303 is extremely weak, a rail may be added.

  Next, the support on the diaphragm blade side of the drive ring 303 will be described. As shown in FIG. 19, the plurality of aperture blades 305 are uniformly arranged in the circumferential direction. Therefore, the drive ring 303 is not partially supported by the plurality of diaphragm blades 305 but is supported evenly as a whole. Therefore, a large force is not applied to the drive ring 303 partially, and the force is dispersed as a whole. Therefore, even if the drive ring 303 is thin, stable driving can be realized without deformation. . Here, in order to reduce the frictional resistance between the drive ring 303 and the diaphragm blade 305, an emboss shape may be formed on the sliding surface of the drive ring 303 and the diaphragm blade 305. The embossed shape may be formed on the drive ring 303 or the diaphragm blade 305.

  A second support method on the diaphragm blade side of the drive ring 303 will be described. A base portion 303 a of the drive ring 303 is supported by rails 306 a formed on the case member 306. In the drawing, the rail 306a has a plurality of hemispherical projections, but the drive ring 303 may be supported by a semi-cylindrical rail.

  The support method on the diaphragm blade side of the drive ring 303 has been described in two ways: support by the diaphragm blade 305 and support by the rail 306a of the case member 306, but they may be used together or only one of them may be used.

  As described above, the drive ring 303 is appropriately supported by the base member 302, the case member 306, and the diaphragm blade 305, so that the drive ring 303 operates at high speed and operates silently without being deformed even if it is configured by the thin base portion 303a. It is possible.

<Embodiment 4>
FIG. 22 is an exploded perspective view of a diaphragm device as a light amount adjusting device according to the fourth embodiment of the present invention.

  The fourth embodiment is an embodiment in which only the gear transmission unit is changed from the first embodiment. The pinion 404 and the pressing member 408 are different in the fourth embodiment from the first embodiment. FIG. 23 shows a perspective view of the pinion 404. The pinion 404 has a gear part 404a and a pressing part 404b. FIG. 24 is a perspective view of the pressing member 408. The pressing member 408 has a rail portion 408b. FIG. 25 shows the relationship among the pinion 404, the drive ring 403, and the pressing member 408. FIG. 26 is a cross-sectional view. A pinion 404 and a pressing member 408 are attached to the drive unit 401. The gear portion 403 d of the drive ring 403 is accommodated between the pressing portion 404 b of the pinion 404 and the rail 408 b of the pressing member 408.

  The pinion 404 and the driven portion 403d of the drive ring 403 transmit force by gear meshing. By supporting the driven portion 403d by the pressing portion 404b and the pressing member 408 of the pinion 404, the driving ring 403 can suppress deformation even if the base portion 403a is thin or the driven portion 403d receives a force. . In the fourth embodiment, the holding member 408 is provided with the circumferential rail 408b. However, there is no problem as long as the driving range of the driving ring 403 can be limited without the rail.

  Further, in this embodiment, the gear engagement portion is sandwiched between the pressing portion 404b and the pressing member 408, so that sound leakage during gear engagement can be prevented. Therefore, it is also effective for reducing the noise of the apparatus.

  The drive ring 403 is appropriately supported by the pinion 404 and the pressing member 408 in addition to the base member 402, the case member 406, and the aperture blade 405, so that even if the drive ring 403 is configured by the thin base 403a, the drive ring 403 is not deformed. It can operate and operate silently.

<Embodiment 5>
FIG. 27 shows an exploded perspective view of a diaphragm device as a light amount adjusting device according to the fifth embodiment of the present invention.

  The configuration of the apparatus is the same as that of the third embodiment. In the fifth embodiment, the drive ring 503 will be described. FIG. 28 shows a perspective view of the drive ring 503. The drive ring 503 has a base portion 503a, an inner engagement portion 503b, a drive pin 503c, a driven portion 503e, a light shielding portion 503f, and a sliding portion 503g. By setting the base 503a to have a uniform thickness, it is difficult to be affected by the air resistance during rotation of the drive ring, so that the operating load can be reduced and high-speed response and quietness can be improved. The base 503a is created by, for example, pressing a resin film (PET sheet material or the like). FIG. 29 shows a perspective view of the base 503a of the drive ring 503. FIG. Compared to the resin molding shape accuracy, the shape accuracy can be formed with high accuracy, so that the drawing accuracy can be high.

  Moreover, as the thickness of the resin film, a material having a thickness of 0.03 mm to 0.30 mm can be used. By making the base 503a as thin as possible, the inertia during rotation can be reduced, and the aperture device can be operated at high speed.

  The base 503a of the drive ring 503 may be made of a material that has been surface-treated on one or both sides. Examples of the surface treatment include sliding coating, antistatic treatment, and antireflection treatment. By sliding coating, the friction between the drive ring and the sliding component can be reduced, and power-saving operation is possible. In addition, by performing antireflection treatment, it is possible to suppress the reflection of light entering the light amount adjusting device and prevent the occurrence of ghost, flare, etc. when the light amount adjusting device is incorporated in the lens barrel. it can.

  FIG. 31 is a cross-sectional view and a perspective view of the periphery of the drive pin 503c of the drive ring 503. FIG. 32 is a cross-sectional view and a perspective view of the base 503a. FIG. 33 is a perspective view of the drive pin 503c and the sliding portion 503g.

  The drive pin 503c and the sliding part 503g are formed on the base 503a by outsert molding, or are formed by adhesion, heat caulking, or the like. The drive pin 503c may be resin or metal. The drive pin 503c and the sliding part 503g are in a positional relationship between the front and back with respect to the base 503a. In addition, the drive pin 503c and the sliding portion 503g are connected through a hole 503i previously formed in the base portion 503a. By sandwiching the base portion 503a between the drive pin 503c and the sliding portion 503g, the mounting strength of the drive pin 503c and the base portion 503a is increased. Even if the base portion 503a is as thin as 0.03 mm to 0.3 mm, strong attachment strength can be maintained.

  The hole 503i may be a round hole, but it is also possible to prevent the drive pin 503c from rotating by making it a polygon, ellipse, semicircle or the like.

  FIG. 30 is a cross-sectional view of the fifth embodiment. As described in the third embodiment, the drive ring 503 places a load on the movable pin 503c engaged with the aperture blade 505. In particular, in the small aperture state, the aperture blades are knitted together, so that a large load is applied to the movable pin 503c serving as a support portion of the aperture blade 505. Therefore, the drive ring 503 tends to deform in the direction of the base member 502. However, in the case of the drive ring 503, there is a sliding portion 503g on the opposite surface across the base portion 503a of the movable pin 503c. Therefore, the load due to the knitting of the diaphragm blades is directly transmitted from the movable pin 503c to the sliding portion 503g. Therefore, the base portion 503a is hardly affected by the load caused by the knitting of the aperture blade 505. Therefore, a thin and weak material can be used for the base portion 503a.

  In the drive ring 503 and the base member 502, the sliding portion 503 g of the drive ring 503 slides with the base member 502. In this case, the drive ring 503 can be stably operated without the base member rail 302a1 as shown in the third embodiment.

  FIG. 34 is a second example of a cross-sectional view and a perspective view of the periphery of the drive pin 503c of the drive ring 503. Unlike FIG. 31, the central axis of the drive pin 503c and the central axis of the sliding part 503g are intentionally shifted. When the sliding portion 503g slides with the base member 502, the sliding portion 503g and the drive pin 503c are integrated, so that when the central axes of the sliding portion 503g and the drive pin 503c coincide, the drive pin 503c is inclined. Cheap. By shifting the central axes of the sliding portion 503g and the drive pin 503c, it is possible to suppress the drive pin 503c from blurring and to perform more accurate control.

  With these configurations, it is possible to provide a high-speed response, power saving, low-noise light amount adjusting device and a small optical device equipped with the same.

<Embodiment 6>
FIG. 35 is a perspective view of a drive ring 603 serving as a light amount adjusting device according to the sixth embodiment of the present invention.

  The configuration of the apparatus is the same as that of the third embodiment. The drive ring 603 has a base portion 603a, an inner engagement portion 603b, a drive pin 603c, a driven portion 603e, and a light shielding portion 603f. By setting the base 603a to have a uniform thickness, it is difficult to be affected by the air resistance during rotation of the drive ring, so that the operating load can be reduced, and high-speed response and quietness can be improved. The base 603a is created by, for example, pressing a resin film (PET sheet material or the like). FIG. 36 shows a perspective view of the base 603 a of the drive ring 603. Compared to the resin molding shape accuracy, the shape accuracy can be formed with high accuracy, so that the drawing accuracy can be high.

  Moreover, as the thickness of the resin film, a material having a thickness of 0.03 mm to 0.30 mm can be used. By making the base portion 603a as thin as possible, the inertia during rotation can be reduced, and the diaphragm device can be operated at high speed.

  The base 603a of the drive ring 603 is preferably made of a material that has been surface-treated on one or both sides. Examples of the surface treatment include sliding coating, antistatic treatment, and antireflection treatment. By sliding coating, the friction between the drive ring and the sliding component can be reduced, and power-saving operation is possible. In addition, by performing antireflection treatment, it is possible to suppress the reflection of light entering the light amount adjusting device and prevent the occurrence of ghost, flare, etc. when the light amount adjusting device is incorporated in the lens barrel. it can.

  FIG. 37 is a cross-sectional view and a perspective view of the periphery of the drive pin 603 c of the drive ring 603. FIG. 38 is a cross-sectional view and a perspective view of the base 603a. FIG. 39 is a perspective view of the drive pin 603c and the fixing portion 603g. The drive pin 603c and the fixing portion 603g are formed on the base portion 603a by outsert molding.

  The drive pin 603c and the fixing portion 603g are in a positional relationship with respect to the base portion 603a. In addition, the drive pin 603c and the fixing portion 603g are connected through a hole 603i1 previously formed in the base portion 603a. By sandwiching the base 603a between the drive pin 603c and the fixing portion 603g, the mounting strength of the drive pin 603c and the base 603a is increased. Even if the base portion 603a is as thin as 0.03 mm to 0.3 mm, strong attachment strength can be maintained.

  In the base portion 603a, a recess 603i2 is formed in addition to the hole 603i1. This shape is formed by making a hole 603i1 in a resin film (PET sheet material or the like) and then forming a recess in the resin film. By making a hole first, a resin escape area can be created and a concave shape can be made in the resin film. At this time, the shape of the hole 603i1 or the recess 603i2 may be a round hole, but the rotation of the drive pin 603c can be prevented by making the shape of a polygon, an ellipse, a semicircle, or the like. Reference numeral 603j denotes a shape formed when the base portion 603a is pressed during outsert molding.

The fixing portion 603g of the drive pin 603c can be formed in the recess 602i2. Therefore, the drive ring 603 can embed the drive pin 603c on the opposite surface across the drive pin 603c and the base 603a without a convex shape. In addition, with this method, the drive pin 603c can be formed with a small diameter regardless of the thickness of the base 603a.
With these configurations, it is possible to provide a light amount adjusting device that is small and has high-speed response, power saving, and low noise, and a small optical device equipped with the light amount adjusting device.

<Embodiment 7>
FIG. 40 is an exploded perspective view of a diaphragm device as a light amount adjusting device according to the seventh embodiment of the present invention.

  As shown in FIG. 40, the diaphragm device of this embodiment is provided with a plurality of cam grooves 703a corresponding to the blades 705 on the drive ring 703, and the blades 705 are engaged with the cam grooves 703a. The configuration of each of the above-described embodiments 1 to 6 is realized except that the projection 705a and the drive pin 705b that engages with the bearing portion 702a provided on the base member 702 are provided to rotate the drive ring 703. It can be adopted as appropriate.

  A drive unit 701 is mounted on the base member 702, and a pinion (pinion gear) 704 serving as a drive transmission unit is attached to a rotation shaft 701 a of the drive unit 701. The pinion 704 is connected to a driven portion (gear portion) 703d partially provided on the outer peripheral portion of the drive ring 703. As a result, the rotational power of the drive unit 701 is transmitted to the drive ring 703.

  In the diaphragm device according to the present embodiment, since the drive ring 703 is formed of an ultra-thin sheet-like member as in the first to sixth embodiments described above, the entire device can be reduced in thickness, Since the ring 703 has a very thin and light configuration, high speed driving and energy saving driving can be realized.

Claims (22)

Blades entering and exiting the light passage path;
A drive ring for driving the blades;
A holding substrate for rotatably holding the drive ring,
The drive ring is formed of an ultra-thin sheet-like member having an engaging portion that engages with the blade.   The blade drive device according to claim 1, wherein the drive ring is formed from the ultra-thin sheet-like member having spring characteristics.   3. The blade driving device according to claim 1, wherein the driving ring is formed from the ultra-thin sheet-like member having a surface layer that is a slidability improving layer on at least one surface of a sheet base material. .   3. The blade driving device according to claim 1, wherein the driving ring is formed of the ultra-thin sheet-like member having a surface layer that is an antistatic layer on at least one surface of a sheet base material.   5. The blade driving device according to claim 3, wherein the surface layer is provided on both surfaces of the sheet base material, and each of the surface layers is provided with substantially the same thickness.   6. The blade driving device according to claim 1, wherein the driving ring is formed from the ultra-thin sheet-like member having a thickness that is half or less of the thickness of the holding substrate. .   6. The drive ring according to claim 1, wherein the drive ring is formed from the ultra-thin sheet-like member that is thinner than the holding substrate and thicker than the blade. Blade drive device.   The said drive ring was formed from the said ultra-thin sheet-like member which has a thickness substantially equal to or less than the thickness of the said blade | wing, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. Blade drive device.   The blade driving device according to any one of claims 1 to 8, wherein the drive ring is held in a rotating posture by a plurality of support portions provided on the holding substrate. The holding substrate has a first substrate disposed on one side of the drive ring, and a second substrate disposed on the other side of the drive ring,
10. The rotating posture of the drive ring is maintained in a state where the drive ring can be driven in a drive space defined between the first substrate and the second substrate. The blade driving device according to claim 1.   The blades are disposed between the drive ring and the first substrate, and are driven only in the space between the drive ring and the first substrate by the drive ring being driven in the drive space. The blade driving device according to claim 10. The first substrate is provided with a first abutting portion that abuts against a portion other than a traveling region where the blades travel on one side of the drive ring,
The second substrate is provided with a second abutting portion that abuts around the engaging portion with which the blade engages on the other surface side of the drive ring,
The blade drive device according to claim 11, wherein the drive ring is held in a rotating posture between the first contact portion and the second contact portion.   The second substrate is provided with an opening that forms a part of the light passage path, and a through hole that is provided on the drive ring and serves as the light passage path is formed around the opening. 13. The blade drive device according to claim 12, further comprising a restricting portion that restricts movement of the drive ring in a direction perpendicular to the optical axis direction in contact with the inner peripheral surface. On the surface of the blade on the drive ring side, an engagement protrusion that engages with a through hole provided in the drive ring is provided,
14. The cam groove engaging protrusion that engages with a cam groove provided on the first substrate is provided on a surface of the blade on the first substrate side. 14. Blade drive device.   On the surface of the blades on the side of the drive ring, a cam groove engaging protrusion that engages with a cam groove provided on the drive ring and a rotation center that is inserted into an insertion portion provided on the second substrate. The blade driving device according to claim 12 or 13, wherein the shaft is provided so as to protrude.   2. A plurality of engaging protrusions that are engaged with engaging blades or engaging cam grooves of the blades are provided as separate members on a surface of the driving ring on the blade side. The blade drive device according to any one of 1 to 13.   The blade according to any one of claims 1 to 16, wherein the blade is configured by a plurality of blade groups arranged in an annular shape around an opening provided through the holding member. Drive device.   The blade drive device according to any one of claims 1 to 16, wherein a drive transmission member that transmits a drive force of the drive ring is connected to an outer peripheral portion of the drive ring. The drive transmission member is a pinion gear attached to the rotation shaft of the drive motor,
The blade driving device according to claim 18, wherein a thickness of the driving ring is smaller than a height dimension of the pinion gear. The drive transmission member has a drive pin that turns as the drive motor rotates,
The blade driving device according to claim 18, wherein a portion of the drive transmission member other than the drive pin is provided with another contact portion for maintaining the rotation posture of the drive ring. .   The drive ring has a through hole that forms at least a part of the light passage path, and a peripheral edge of the through hole on the side where the blade engages is an R-shaped portion. The blade drive device according to any one of claims 1 to 20.   An image pickup apparatus comprising the blade driving device according to any one of claims 1 to 21.

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