JP2005195817A - Diaphragm apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaphragm apparatus which is miniaturized by promoting space-saving. <P>SOLUTION: Regarding the diaphragm apparatus 1 equipped with a substrate 3 having a lens aperture 4, small stop sectors 60 and 70 having small stop holes 63 and 73, and also, whose appearance is formed so as to shield the lens aperture while leaving a part of the lens aperture at a position of closing the lens aperture, and auxiliary shielding sectors 80 and 90 for shielding the part of the lens aperture not shielded by the small stop sectors, the small stop sectors and the auxiliary shielding sectors are coaxially journaled by the same shafts 61 and 71 so that they can freely undulate. Regarding the diaphragm apparatus 1, the constitution of the circumferential part of the lens aperture 4 is simplified by unnecessitating to separately install supporting shafts for the sectors 80 and 90, then, the miniaturization of the apparatus is attained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an aperture device for optical equipment. More particularly, the present invention relates to an aperture device that can be suitably used for an optical apparatus such as a digital camera or a video camera.

  Many proposals have been made for an aperture device built in a camera. A diaphragm device that drives a large number of diaphragm blades using a drive ring to realize a multistage diaphragm of five or more stages, a diaphragm device that shields a lens opening with a diaphragm blade having a small diaphragm hole, and the like, and the like. Is well known. An aperture device using a drive ring is generally used in high-end cameras because of its complicated structure and large size. However, in recent years, low-priced cameras and digital cameras have become widespread. Therefore, there is a growing demand for a diaphragm device that is limited to about 2 to 4 stops and is more compact with a simple structure.

  A diaphragm device that is reduced in size by limiting the number of diaphragm stages is disclosed in Patent Document 1, for example. The diaphragm device of Patent Document 1 includes a small diaphragm blade having a small diaphragm hole and an auxiliary blade that shields the lens opening in cooperation with the small diaphragm blade. If a large small aperture blade is used, the space around the lens opening increases, resulting in an increase in size of the apparatus. Therefore, this diaphragm device employs small diaphragm blades having a small area. However, if the small diaphragm blade is reduced in size in this way, the lens opening cannot be shielded alone. Therefore, auxiliary blades for shielding assistance are added. That is, in the diaphragm device of Patent Document 1, the small diaphragm blade and the auxiliary blade cooperate to shield the lens opening, thereby reducing the size of the device.

  With the aperture device as described above, it is possible to easily switch between a large aperture (lens aperture) provided on the substrate and a small aperture aperture with a small diameter. Since the space is saved, the apparatus can be miniaturized.

JP 2001-215553 A

  However, in the diaphragm device disclosed in Patent Document 1, the support shaft of the small diaphragm blade and the support shaft of the auxiliary blade are arranged separately. Thus, when a plurality of support shafts are arranged on the periphery of the lens opening, it is necessary to secure a certain space. Further, this diaphragm device employs an interlocking mechanism in which the operating member is first driven to swing the small diaphragm blade, and the auxiliary blade is further rocked using the rocking motion of the small diaphragm blade. Therefore, it is necessary to secure a certain space in order to realize such an interlocking mechanism. Therefore, the diaphragm apparatus disclosed in Patent Document 1 also has a problem that there is a useless space.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an aperture device that solves the above-described problems and promotes space saving to achieve miniaturization.

  The object is to provide a substrate having a lens aperture, a small aperture sector having a small aperture hole and having an outer shape formed so as to shield the lens aperture at a position where the lens aperture is closed. An aperture apparatus comprising: a shielding auxiliary sector that shields a part of the lens opening that cannot be shielded by the small aperture sector, wherein the small aperture sector and the shielding auxiliary sector are coaxially and freely pivotable. This can be achieved by a supported throttle device.

  According to the present invention, the shielding auxiliary sector that performs shielding assistance for the small aperture sector is supported coaxially with the small aperture sector. Therefore, it is not necessary to provide a separate support shaft for the shielding auxiliary sector, so that the configuration of the lens opening peripheral portion can be simplified and the apparatus can be reduced in size.

  Two sets of the small aperture sector and the shielding auxiliary sector are provided, the first small aperture sector and the first shielding auxiliary sector are pivotally supported by a first support shaft, and the second small aperture sector and The two shielding auxiliary sectors are pivotally supported by a second spindle, and when the first small aperture sector and the first shielding auxiliary sector cooperate to shield the lens opening, a first stage aperture state is formed, When the second small aperture sector and the second shielding auxiliary sector cooperate to shield the lens aperture, a diaphragm device in which a second stage diaphragm state is formed may be formed. In this case, since two small-diaphragm sectors are provided, it is possible to provide a diaphragm device that realizes a two-stage small diaphragm while saving space.

  The shielding auxiliary sector preferably has a structure having a hole larger than the small stop hole formed in the small stop sector forming a set. When such a structure is adopted, the shielding auxiliary sector does not become an obstacle to the diaphragm when the small diaphragm sector comes to a position where the lens aperture is shielded and becomes a small diaphragm. In addition, the small aperture sector and the shielding auxiliary sector that form a set can cooperate with each other when the lens opening is shielded so that the lens opening can be shielded. It is possible to adopt a structure having an outer shape in which the narrow portion is positioned oppositely.

  Each of the small aperture sector and the shielding auxiliary sector has a cam groove, and includes a drive pin that engages with the cam groove, and forms a set as the drive pin moves. The small aperture sector and the shielding auxiliary sector can be configured to swing simultaneously to a position for shielding the lens opening and a position for retracting from the lens opening. In this case, the diaphragm device swings all the sectors with one drive pin, so that the size can be further reduced. The optical apparatus apparatus including the diaphragm device described above is small and can move the diaphragm sector with high accuracy, so that a clear image can be taken.

  As described above, according to the present invention, it is possible to reduce the size of an aperture device including a small aperture sector and a shielding auxiliary sector.

  Hereinafter, a diaphragm device according to an embodiment will be described with reference to the drawings. The embodiment described below is an aperture device that includes two sets of a small aperture sector (small aperture blade) and a shielding auxiliary sector (auxiliary blade) that assists shielding to realize a two-stage small aperture.

  FIG. 1 is a diagram illustrating a state where the diaphragm device according to the embodiment is in a fully opened state. FIG. 2 is a diagram showing two small-squeezing sectors included in the diaphragm device 1 of FIG. 1 and two shielding auxiliary sectors that assist the shielding. FIG. 3 is a view showing a state when the diaphragm device 1 is in a one-stage diaphragm state. FIG. 4 is a view showing a state when the diaphragm device 1 is in a two-stage diaphragm state. Further, FIG. 5 is a side view showing the arrangement relationship between the substrate and the actuator provided in the diaphragm device of FIG.

  As shown in FIG. 1, the aperture stop device 1 includes two original small aperture sectors 60 and 70 on the left and right sides of the lens opening 4. The first sector 60 is a first small aperture blade provided with a large small aperture hole 63. The second sector 70 is a second small diaphragm blade having a small diaphragm hole 73 smaller than the small diaphragm hole 63 of the first sector. Further, a first shielding auxiliary sector 80 for shielding the lens opening in cooperation with the first sector 60 and a second shielding auxiliary sector 90 for shielding the lens opening in cooperation with the second sector 70 are further arranged. Yes. In FIG. 1, the portions related to the first sector 60 and the second sector 70 are indicated by solid lines so that each sector can be easily confirmed. Further, the first shielding auxiliary sector 80 is indicated by a long broken line, and the second shielding auxiliary sector 90 is indicated by a broken line.

  A lens opening 4 is formed in the center of the substrate 3. When the first sector 60 and the first shielding auxiliary sector 80 cooperate to shield the lens opening 4, the first sector 60 is formed with a small aperture hole 63, so that the first aperture state (one aperture) State) is formed (see FIG. 3). Further, when the second sector 70 and the second shielding auxiliary sector 90 are shielded together, the second sector 70 is formed with the small-diaphragm holes 73 having different diameters. A diaphragm state is formed (see FIG. 4).

  The first sector 60 is configured to be swingable about a support shaft (swing shaft) 61 and includes a cam groove 62 formed in an elongated hole shape. Similarly, the second sector 70 is configured to be swingable about a support shaft 71 and includes a cam groove 72. The cam pins 62 and 72 are engaged with a drive pin 5 that swings in an arcuate locus by a step motor 7 (see FIG. 5). That is, one drive pin 5 passes through the two cam grooves 62 and 72, and the two sectors 60 and 70 are moved to predetermined positions as the drive pin 5 moves. Further, the first shielding assisting sector 80 that assists the shielding of the first sector 60 is provided with a cam groove having a shape similar to the cam groove 62. Similarly, the second shielding auxiliary sector 90 that assists the shielding of the second sector 70 is provided with a cam groove having a shape similar to the cam groove 72. The sectors forming the set are configured to swing simultaneously. The cam grooves formed in each sector will be described later.

  2A and 2B are diagrams showing the sectors 60 to 90 shown in FIG. 1 so that they can be easily confirmed. FIG. 2A shows the first sector 60, FIG. 2B shows the first shielding auxiliary sector 80, and (C ) Shows the second sector 70, and (D) shows the second shielding auxiliary sector 90. When attention is paid to the first sector 60 indicated by (A), the width indicated by the reference numeral 65 is formed narrow. On the contrary, the width of the opposite portion indicated by reference numeral 66 is wide. When the width (area) on the side of the lens opening 4 is thus reduced, the sector 60 can be disposed close to the lens opening 4, so that the entire apparatus can be downsized.

  However, since the first sector 60 is small as shown in FIG. 3 (single-stage stop), the lens opening 4 cannot be completely blocked at the position where the lens opening 4 is closed, and an unshielded area PA is generated. The first shielding auxiliary sector 80 shown in FIG. 2B is arranged to shield the area PA. Therefore, in the first shielding auxiliary sector 80, a portion for shielding the area PA (portion indicated by reference numeral 85) is formed wide, but the opposite position indicated by reference numeral 86 is narrow. In this manner, the first sector 60 and the first shielding auxiliary sector 80 have an outer shape in which the wide portion and the narrow portion are oppositely positioned so as to shield the lens opening 4 in cooperation with each other.

  The second set of the second sector 70 and the second shielding auxiliary sector 90 has the same relationship as the first set as described above. In the second sector 70, the width of the portion indicated by reference numeral 75 is narrow, and the opposite position is wide. In the case of the second sector 70, as shown in FIG. 4 (two-stage stop), a region PB that cannot shield the lens aperture 4 occurs. However, since the second shielding auxiliary sector 90 of FIG. 2D is provided to shield this portion, the lens opening 4 can be reliably shielded as in the first group.

  The first shielding auxiliary sector 80 is provided with a hole 83. The hole 83 is formed larger than the small aperture hole 63 of the first sector 60. The two sectors 60 and 80 cooperate to shield the lens opening 4 as shown in FIG. 3, so that the hole 83 is formed larger so as not to interfere with the small aperture hole 63 of the first sector 60. Has been. This relationship is the same for the second sector 70 and the second shielding auxiliary sector 90, and the hole 93 of the second shielding auxiliary sector 90 is formed larger than the small aperture hole 73 of the second sector 70.

  Next, a configuration for driving each sector will be described. In FIG. 2A, the position of the drive pin 5 in the fully opened state shown in FIG. 1 is shown as the initial position (5-1). The position of the drive pin 5 at the time of the first aperture shown in FIG. 3 is indicated by a position (5-2), and the position of the drive pin 5 at the time of the second aperture shown in FIG. 4 is indicated by a position (5-3). Yes. In the present diaphragm device 1, a state of a one-stage diaphragm is formed when the drive pin 5 is rotated counterclockwise with the initial position (5-1) of the drive pin 5 therebetween, and conversely, when it is rotated clockwise, two stages are formed. A diaphragm state is formed.

  The cam grooves 62 and 72 formed in each of the first sector 60 and the second sector 70 remain at a position where the other sector is retracted from the lens opening 4 when one sector shields the lens opening 4 from each other. It is formed as follows. The cam groove 82 of the first shielding auxiliary sector 80 is approximate to the cam groove 62 of the first sector 60. Similarly, the cam groove 92 of the second shielding auxiliary sector 90 approximates the cam groove 72 of the second sector 70. The sectors forming the set swing in a similar locus and swing between a position where the lens opening 4 is shielded and a position where the lens opening 4 is retracted. However, the cam grooves 82 and 92 on the auxiliary sector side are not elongated holes, but are open at one end.

  The cam groove formed in each sector will be described. Each of the sectors 60 to 90 included in the diaphragm device 1 has cam grooves 62, 72, 82, and 92 formed so as to be guided to the lens opening 4 and remain in the retracted position when they are not involved in the diaphragm. ing. Here, the retracted position is a position where each sector 60 to 90 is retracted so as not to block the lens opening 4. In the fully open state shown in FIG. 1, the four sectors 60 to 90 are all in the retracted position. In the state of the one-stop diaphragm shown in FIG. 3, the first set of sectors 60 and 80 are in positions where the lens openings are shielded, and the second set of sectors 70 and 90 are in positions retracted from the lens openings 4. Further, the state of the two-stage aperture in FIG. 4 is opposite to the state of the first-stage aperture.

  The cam grooves 62 and 72 formed in the first sector 60 and the second sector 70 will be described with reference to FIGS. 3 and 4 together with FIG. As shown in FIG. 2, the cam groove 62 formed in the first sector 60 moves the sector 60 to the lens opening 4 when the drive pin 5 moves from the initial position (5-1) to the position (5-2). On the contrary, when the drive pin 5 moves from the initial position (5-1) to the position (5-3) to guide the second sector 70 to the lens opening 4, the sector And a non-oscillating region β that holds 60 in the retracted position.

  The first sector 60 shown in FIG. 2A is in the fully opened state of FIG. 1, and when the drive pin 5 moves to the position (5-2) from this state, the first-stage aperture state of FIG. Become. When paying attention to the first sector 60 at this time, the drive pin 5 moves in the cam groove 62 toward the swinging region α side and comes into contact with the end of the cam groove 62 and is rotated clockwise around the support shaft 61. ing. On the other hand, the attitude of the second sector 70 is not changed between FIG. 1 and FIG.

  As described above, the first sector 60 swings when the drive pin 5 moves from the initial position (5-1) to the position (5-2). However, the cam groove 72 of the second sector 70 shown in FIG. 2C is formed with a non-oscillating region β in this portion. This non-oscillating region β is formed in an arc shape along the locus of the drive pin 5. Therefore, even if the drive pin 5 moves from the initial position (5-1) to the position (5-2), the second sector 70 does not receive a force (load) that causes the second sector 70 to move from the drive pin 5. That is, the second sector 70 is held at the same position. Therefore, in the case of the one-stop diaphragm shown in FIG. 3, a state is formed in which only the first sector 60 is moved to a position where the lens opening 4 is shielded and the second sector 70 is held at the retracted position.

  The cam groove 62 of the first sector 60 and the cam groove 72 of the second sector 70 are formed in a substantially line-symmetric shape. Therefore, when the two-stage aperture state shown in FIG. 4 is reached, the opposite relationship is formed. That is, when the drive pin 5 moves from the initial position (5-1) to the position (5-3), the second sector 70 rotates around the support shaft 71 to shield the lens opening 4 as shown in FIG. . On the other hand, even if the drive pin 5 moves from the initial position (5-1) to the position (5-3), the first sector 60 does not receive a force (load) that causes the first sector 60 to move from the drive pin 5. Therefore, in the case of the two-stage stop shown in FIG. 4, contrary to the case of the single-stage stop shown in FIG. 3, only the second sector 70 is moved to a position where the lens opening 4 is shielded, and the first sector 60 is set to the retracted position. Will be retained. In addition, after forming the state of the 1st aperture shown in FIG. 3 and the state of the 2nd aperture shown in FIG. 4, it can return to the fully open state shown in FIG. 1 by driving the drive pin 5 in the reverse direction.

  In order to facilitate understanding, the cam grooves of the first sector 60 and the second sector 70 have been described above. However, the cam groove 82 of the first shielding auxiliary sector 80 has a shape approximate to the cam groove 62 of the first sector 60. I have. Therefore, the first shielding auxiliary sector 80 is simultaneously swung along the locus close to the first sector 60 as the drive pin 5 moves. The same applies to the second shielding auxiliary sector 90 that assists the second sector 70.

  As described above, in the diaphragm device 1 of the embodiment, when one set of sectors shields the lens opening 4, the other set of sectors is held at the shielding position. In particular, the return operation of the fully opened state in FIG. 1, the one-stage throttle state in FIG. 3, the two-stage throttle state in FIG. 4, and the states in FIGS. 3 and 4 to 1 is realized by cam grooves formed in each sector. . The diaphragm device 1 does not require a return spring for returning the sector to the initial position or a positioning member every time the stop position is defined. Therefore, the aperture device 1 can simplify the configuration and swing the sector.

  And this apparatus 1 is equipped with the novel structure which swings four sectors in order to save space. This point will be described. As shown in FIGS. 1 and 2, the first shielding assisting sector 80 is configured to be coaxial and swingable by using the support shaft 61 of the first sector 60. Similarly, the second shielding auxiliary sector 90 is configured to be coaxial and swingable by using the support shaft 71 of the second sector 70 as well. By adopting such a structure, it is not necessary to provide a support shaft for swinging the shielding auxiliary sector, so that space can be saved. In this structure, most of the swinging area of the shielding auxiliary sector overlaps with the swinging area of the small aperture sector. Therefore, it is not necessary to secure a space for the shielding auxiliary sector in the periphery of the lens opening 4. Therefore, in the present apparatus 1, it is not necessary to separately provide a supporting shaft for the auxiliary sector and a swinging space as in the prior art, so that the configuration can be simplified and downsized.

  Furthermore, with reference to FIG. 5, the structure which drives the sectors 60-90 of the said diaphragm | throttle device 1 is demonstrated easily. FIG. 5 is a side view showing the positional relationship between the substrate 3 and the motor 7 provided in the diaphragm device 1 of FIG. The step motor 7 includes a rotor 702 and a U-shaped stator 703 on the outer periphery thereof. Two coils 704 and 705 are wound around the stator 703. These coils 704 and 705 are driven and controlled by a control circuit (not shown).

  The substrate 3 includes the lens aperture 4 as described above, but is not shown in FIG. On the front side of the substrate 3, the above-mentioned four sectors 60 to 90 are arranged along the substrate surface. These sectors are the first sector 60, the first shielding auxiliary sector 80, the second sector 70, and the second shielding auxiliary sector 90 from the substrate 3 side. The step motor 7 is disposed on the back side of the substrate 3. A presser plate 2 is disposed on the front side of the sector.

  The first sector 60 includes a hole that engages with a support shaft 61 provided on the substrate 3 and the cam groove 62 that engages with the drive pin 5 connected to the rotor shaft 707 of the step motor 7. The first shielding auxiliary sector 80 includes a hole that engages with the support shaft 61 and the cam groove 82 that engages with the drive pin 5 connected to the rotor shaft 707 of the step motor 7. As described above, the first sector 60 and the first shielding auxiliary sector 80 are pivotally supported by the same support shaft 61 and swing.

  Similarly, the second sector 70 includes a hole that fits into a support shaft 71 provided on the substrate 3 and the cam groove 72 that engages with the drive pin 5. The second shielding auxiliary sector 90 includes a hole that engages with the support shaft 71 and the cam groove 82 that engages with the drive pin 5 connected to the rotor shaft 707 of the step motor 7. Therefore, the second sector 70 and the second shielding auxiliary sector 90 are also pivotally supported by the same support shaft 71 and swung.

  An arm portion 8 extending in the radial direction is connected to the rotor shaft 707 of the step motor 7 disposed on the back side of the substrate 3. A drive pin 5 extending from the end of the arm 8 to the opposite side through a fan-shaped opening 6 (see FIG. 1) provided on the substrate 3 side is connected. Cam grooves 62, 72, 82, and 92 (see FIG. 2) provided in each of the sectors 60 to 90 are engaged with the drive pin 5 that protrudes to the front side. Therefore, when the rotor shaft 707 of the step motor 7 is rotated, the drive pin 5 is moved along with this, and the four sectors 60 to 90 are swung along a predetermined trajectory. Closed), FIG. 3 (one-stage aperture) and FIG. 4 (two-stage aperture) can be formed. As described above, in the present apparatus 1, four sectors can be swung by only one drive pin 5. Therefore, such a configuration also simplifies the device configuration and promotes downsizing.

  As described above, since the aperture device 1 has the small aperture sectors 60 and 70 formed small, it is possible to promote downsizing of the device. In particular, the shielding auxiliary sectors 80 and 90 that shield the unshielded portions swing using the spindle shafts 61 and 71 of the small aperture sectors 60 and 70 as well. Therefore, the configuration can be simplified and the apparatus can be reduced in size. In addition, the apparatus 1 can promote downsizing in that the drive pin 5 is engaged with a cam groove formed in each sector for driving, and the device 1 can be surely opened fully without using a return pin or a fixing member. A diaphragm or a two-stage diaphragm can be formed.

  Furthermore, a more preferable improvement example for securely holding each sector 60 to 90 at the retracted position will be described. As described above, the sectors 60 to 90 are guided to the lens opening 4 by the cam grooves 62, 72, 82, and 92, and can be held at the retracted positions. The support shafts 71 and 61 can be used as a configuration for more securely holding each sector at the retracted position.

  As shown in FIG. 1, when the first sector 60 and the first shielding auxiliary sector 80 are retracted from the lens opening 4, the first sector 60 and the first sector 60 and the second sector 70 are just in contact with the support shaft 71. The end of the first shielding auxiliary sector 80 is shaped. Similarly, the end portions of the second sector 70 and the second shielding auxiliary sector 90 are shaped so as to come into contact with the support shaft 61 of the first sector 60 when the second sector 70 and the second shielding auxiliary sector 90 are retracted from the lens opening 4. In this improved example, the support shaft of one sector is also used as an auxiliary degree positioning member for the other sector. Therefore, it is possible to realize a structure that reliably stops each sector 60 to 90 at a predetermined position without increasing the number of parts.

  The preferred embodiment of the present invention has been described in detail above. However, the present invention is not limited to the specific embodiment, and various modifications can be made within the scope of the gist of the present invention described in the claims. Deformation / change is possible. In the above embodiment, it is more preferable that the first set of the first sector and the first shielding auxiliary sector and the second set of the second sector and the second shielding auxiliary sector are arranged to form a two-stage small aperture. An example is described. However, the present invention is not limited to such an embodiment. A small aperture sector and a shielding auxiliary sector that assists this may be used as a set, and the aperture device may perform full aperture and one-stage small aperture by swinging them coaxially.

It is the figure which showed a mode when the aperture_diaphragm | restriction apparatus which concerns on an Example is in a full open state. It is the figure which took out and showed two small-diaphragm sectors contained in the diaphragm | throttle device of FIG. 1, and two shielding auxiliary sectors which assist these. It is the figure which showed the mode when the aperture_diaphragm | restriction apparatus exists in the state of 1 step | paragraph aperture. It is the figure which showed a mode when the aperture_diaphragm | restriction apparatus exists in the state of a two-stage aperture. It is the side view which showed the arrangement | positioning relationship between the board | substrate and motor with which the aperture_diaphragm | restriction apparatus of FIG. 1 is provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Diaphragm 3 Substrate 4 Lens opening 5 Drive pin 60 1st sector 61 Support shaft 62 Cam groove 63 Small aperture hole 70 2nd sector 71 Support shaft 72 Cam groove 73 Small aperture hole 80 1st shielding assistance sector 90 2nd shielding assistance Sector α Oscillation region β Non-oscillation region

Claims (6)

A substrate having a lens aperture, a small aperture sector having a small aperture, and having an outer shape formed so as to shield the lens aperture at a position where the lens aperture is closed, and the small aperture An aperture stop device comprising a shielding auxiliary sector that shields a part of the lens opening that cannot be shielded by a sector,
An aperture device in which the small aperture sector and the shielding auxiliary sector are coaxially and pivotally supported. Two sets of the small aperture sector and the shielding auxiliary sector are provided, the first small aperture sector and the first shielding auxiliary sector are pivotally supported by a first support shaft, and the second small aperture sector and 2 The shielding auxiliary sector is pivotally supported by the second spindle.
When the first small aperture sector and the first shielding auxiliary sector shield the lens opening in cooperation, a first stage aperture state is formed,
2. The diaphragm device according to claim 1, wherein a second stage diaphragm state is formed when the second small diaphragm sector and the second shielding auxiliary sector cooperate to shield the lens opening. The aperture stop device according to claim 1, wherein the shielding auxiliary sector has a hole larger than the small aperture hole formed in the small aperture sector forming a set. The small aperture sector and the shielding auxiliary sector that form a set are configured so that the lens aperture can be shielded in cooperation with each other when the lens aperture is in a position to shield the lens aperture. The diaphragm apparatus according to claim 1, wherein the diaphragm device has an outer shape that is opposite to the outer shape. A cam groove is formed in each of the small aperture sector and the shielding auxiliary sector, and includes a drive pin that engages with the cam groove,
2. The small aperture sector and the shielding auxiliary sector forming a set simultaneously swing to a position for shielding the lens opening and a position for retracting from the lens opening as the driving pin moves. 5. The aperture device according to any one of 4 above. An optical apparatus apparatus including the diaphragm apparatus according to claim 1.

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