WO2005040910A1

WO2005040910A1 - Shutter device and optical device having the same

Info

Publication number: WO2005040910A1
Application number: PCT/JP2004/015015
Authority: WO
Inventors: Seiichi Oishi; Hisashi Kawamoto; Phichet Numnual; Kazuya Shioda
Original assignee: Seiko Precision Inc.
Priority date: 2003-10-29
Filing date: 2004-10-12
Publication date: 2005-05-06
Also published as: JP2005134574A; JP4335639B2

Abstract

A shutter device (1), comprising a base plate (3) having a shutter opening (4) and a braking member (40) having a plurality of sectors (10), (20), and (30) having cam grooves (12), (22), and (32), swingably disposed on the base plate, and opening/closing the shutter opening (4) and an operating member (5) engaged with the cam grooves and swinging the sectors, and providing a load to the operating member (5) to suppress the swing movement of the operating member (5) in an area where the sectors fully close the shutter opening (4) when the shutter opening is fully closed. Since the shutter device (1) comprises the braking member (40) providing the load against the movement of the operating member (5) when the operating member (5) moves the sectors (10), (20), and (30) until the shutter opening (4) is fully closed, the sectors do not come out of their specified positions.

Description

Specification

Shirter device and optical apparatus including the same

Technical field

[0001] The present invention relates to a shirter for an optical device. More particularly, the present invention relates to a shirting device that can be suitably used for optical devices such as digital cameras and video cameras.

Background art

[0002] For example, Patent Document 1 describes a camera shutter device. This patent document 1 discloses a technique of opening and closing two sectors of an upper aperture blade and a lower aperture blade by a step motor. FIG. 12 is a diagram showing an example of the sector operation in the conventional shirting device shown in Patent Document 1. In FIG. The first sector 101 is pivotable about the fixed axis 102 and the second sector 107 is pivotable about the fixed axis 108. These sectors 101 and 107 are movably disposed at positions where the shutter opening 100 formed in the shirter substrate is open and closed.

[0003] Specifically, the first sector 101 is provided with an opening 103, and the second sector 107 is similarly provided with an opening 109. An operating pin 105 pivoted by a stepper motor (not shown) penetrates and engages these openings 103 and 109. Therefore, as shown in FIG. 12, by moving the actuating pin 105 in a predetermined direction, the positions of the two sectors 101 and 107 can be controlled to form the small aperture, fully closed, and fully opened states.

Patent Document 1: Japanese Patent Application Laid-Open No. 2000-39646

Disclosure of the invention

Problem that invention tries to solve

In the shirting apparatus disclosed in Patent Document 1, the openings 103 and 109 of the first sector 101 and the second sector 107 are both simple in shape, and the position of the operating pin 105 moves upward. Accordingly, the first sector 101 and the second sector 107 form the small throttle, the fully closed, and the fully open state. In addition, when the operating pin 105 is moved downward, a state opposite to this is formed. Here, the fully closed state exists between the small aperture state and the fully closed state. Therefore, when moving the sectors 101 and 107 from the fully open position to the fully closed position or from the small throttle position to the fully closed position by driving the step motor, an electrical brake pulse is sent immediately before the sector stops. The method of controlling the drive of the step motor in the reverse direction is generally employed. Meanwhile, recent shirt speeds are high, and the width of brake timing is extremely narrow. Therefore, it is extremely difficult to electrically control the step motor to stop the rotor at a predetermined position. As a result, the operating pin 105 driven by the rotor may overrun past the intended position (position where the sector is fully closed).

When the operating pin 105 overruns in this manner, the position force for full closing for which the sectors 101 and 107 are scheduled is also shifted, and light enters the aperture 100 (hereinafter referred to as a reexposure state). As described above, light can not be blocked with certainty at the original fully closed position, and optical equipment such as a camera employing a shirt can not perform proper photographing.

In the above-mentioned Patent Document 1, two sectors form a state of small aperture, fully closed, fully open. However, there are also attempts at shirts that use the third sector for small aperture, and form the condition of small aperture, fully closed, and fully open in a 3-sheet configuration as well. As described above, also in the case of a shirt using three sectors, there is a problem that when the sector is stopped, it can not be stopped at a predetermined position due to the overrun of the operation pin 105 described above. Also, in a typical shirt, the movement restricting member is disposed at a predetermined position so that the sector does not move beyond the predetermined range. For example, the sector which closed the shirt opening does not move any more !, so that the abutment member is arranged. As described above, when the operating pin 105 overruns, the sector strongly collides with the abutment member. This collision may cause the sector to be bounced (referred to as bouncing), and may cause problems similar to those described above, such as re-exposure and damage to the sector due to a strong collision.

Therefore, an object of the present invention is to solve the above-described conventional problems and to provide a shirting device capable of reliably stopping a sector at a desired position with a simple structure.

Means to solve the problem

The above object is to provide a substrate having a shirt opening, a cam groove, and a plurality of sectors which are swingably arranged on the substrate and which open and close the shirt opening, and engage the cam groove. Actuating member for swinging the sector, and when the shutter opening is fully closed, a load is applied to a region where the sector fully closes the shirter opening to suppress swinging of the operating member. This can be achieved by a shirting device provided with a braking member.

According to the present invention, when the actuating member moves the sector to close the shutter opening to a fully closed state, the movement of the actuating member moving therearound is limited. That is, the control member applies a load so as to suppress the swing of the actuating member in the region where the sector fully closes the shirt opening. Therefore, even if the actuating member is further moved, this is restricted, so that the sector that blocked the shirt opening does not shift in position. Therefore, it is possible to provide a shirting device that does not cause re-exposure and bounce problems. The control member may be configured to be pressed and moved by the actuating member in a region where the sector fully closes the shirt opening when the shirt opening is fully closed.

The braking member includes a plate-like member which is rotatably disposed on the substrate coaxially with the sector and includes a braking cam groove engaged with the actuating member, and is pressed by the actuating member. Preferably, the shutter opening is not closed when it is turned. By forming the braking member in this manner, it can be incorporated into a shirt and used like other sectors. The braking member may be driven to rock the sector to form the shutter opening fully open, fully closed, and in a small throttle state. Further, the braking cam groove is formed such that an angle formed by a rotational direction of the actuating member and a tangential direction in which the actuating member abuts on the braking cam groove is large, and The swinging load can be increased.

Further, a substrate having a shirt opening, a cam groove, and a plurality of sectors swingably arranged on the base plate for opening and closing the shirt opening, engaged with the cam groove to rock the sector Actuating actuating member and rotatably disposed about a fixed axis provided on the substrate, the actuating member engaging the braking cam groove and the actuating member serving as the sector to open the shutter opening When the shutter is provided with the braking member, the angle formed by the moving direction of the actuating member and the tangential direction of the braking cam groove in contact with the actuating member is large when the fully closed state is achieved. Similarly, the above object can be achieved.

In addition, the above object is to provide a substrate having a shutter opening, a cam groove, and the substrate. The sector includes a plurality of sectors swingably arranged to open and close the shirt opening, and an actuating member for swinging the sector in engagement with the cam groove, and when the shirt opening is fully closed, the sector is the shirt The cam groove of a given sector is also formed in the region where the opening is fully closed so as to apply a load so as to suppress the swing of the actuating member, which can also be achieved by the shirting device.

According to the present invention, the movement of the actuating member approaching the cam groove force fully closed position of a predetermined sector for opening and closing the shirt opening is limited. That is, the cam groove applies a load so as to suppress the movement of the actuating member in a region where the sector fully closes the shirt opening when the shirt opening is fully closed. Therefore, it is possible to provide a shirting device capable of preventing the occurrence of re-exposure and the like without adding a new member. The cam groove may include a V-shape, and the sector may be formed so that the shutter opening is fully closed when the actuating member reaches the V-shaped valley.

Further, a substrate having a shirt opening, a cam groove, and a plurality of sectors swingably arranged on the base plate for opening and closing the shirt opening, engaged with the cam groove to rock the sector The cam groove includes a V-shape, and the actuating member includes the V-shape when the actuating member makes the sector and the shutter opening is fully closed. The above object can be similarly achieved by a shirt device in which the sector fully closes the shirt opening when reaching the valley.

Then, the actuating member can be driven to swing the sector to form the shutter opening fully open, fully closed, and the state of the small throttle. With the above-described shirter device, re-exposure and bouncing can not occur. With an optical apparatus such as a digital camera including this shirter device, a clear photographed image can be obtained. Effect of the invention

As described above, according to the present invention, it is possible to provide a shirt device for an optical device that can reliably stop a sector at a desired position such as a fully closed position.

Brief description of the drawings

FIG. 1 is a view showing a state in which a shirt device according to a first embodiment is in a fully open state.

[FIG. 2] (A), (B) and (C) show the three sectors included in the shirting device of the first embodiment. FIG.

FIG. 3 is a view showing a restricting plate included in the shirting device of the first embodiment.

FIG. 4 is a view showing a state in which the shirt device of Example 1 is in a fully closed state.

FIG. 5 is a view showing the state of the shirting device of Embodiment 1 in the small aperture state.

[FIG. 6] FIG. 6A is an enlarged view of the peripheral portion of each sector and the operation pin for driving the regulation plate and the stepper motor for driving the sector, and FIG. The movement range of the movement pin is a diagram shown in! /, CR.

[FIG. 7] (A), (B), (C) are enlarged views of predetermined sectors included in the shirting device of the second embodiment.

[FIG. 8] A diagram showing how the shirting device of Example 2 changes to full opening force and full closing.

[FIG. 9] (A), (B), (C) are diagrams showing three sectors included in the shirting device of the second embodiment.

FIG. 10 is a view showing how the shutter device of Embodiment 2 changes from a small aperture to a fully closed position.

FIG. 11 is a view showing a state in which the shirt device of Example 2 is in a fully closed state.

FIG. 12 is a diagram showing a sector operation in the conventional shirting device.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the best mode of the present invention will be described with reference to the drawings. Two examples are shown here.

Example 1

The shirt apparatus of the embodiment 1 will be described based on the drawings. 1 to 6 show the shirting device of the first embodiment. FIG. 1 is a view showing a state where the shirting device 1 according to the first embodiment is in a fully open state. FIG. 2 is a diagram showing three sectors included in the shirting device 1 of FIG. FIG. 3 is a view showing a regulation plate 40 as a braking member included in the shirting device 1 of FIG. FIG. 4 is a view showing the state when the shirting device 1 is in the fully closed state. FIG. 5 is a view showing the mode when the shirting device 1 is in the small aperture state. FIG. 6 is a view showing the configuration of the shirting device 1 including a step motor for driving an operating pin as an operating member for driving a sector.

As shown in FIG. 1, the shirting device 1 is configured of three sectors. This shirt device 1 It has a cutter substrate 3 and three sectors 10, 20 and 30. The first sector 10 is a first shirt blade and the second sector 20 is a second shirt blade. The third sector 30 is an aperture blade with a small aperture. Here, in order to make it easy to identify each sector, a portion relating to the first sector 10 is shown by a solid line, a portion relating to the second sector 20 is shown by a long broken line, and a portion relating to the third sector is shown by a dotted line. A shirt opening 4 is formed at the center of the shirt substrate 3.

The first sector 10 is configured to be rotatable around the fixed shaft 11 and includes a cam groove 12. The second sector 20 is configured to be rotatable around the fixed shaft 21 and includes a cam groove 22. The third sector 30 is configured to be rotatable around the fixed shaft 31, has a cam groove 32 and has a small throttle hole 33. An operating pin (operating member) 5 driven in a predetermined range is engaged with the three cam grooves 12, 22, 32 by a step motor (see FIG. 6 described later) not shown here. That is, one actuating pin 5 passes through the three cam grooves 12, 22 and 32, and the movement of this actuating pin 5 is configured such that all sectors 10, 20 and 30 perform a predetermined rocking motion. It is done.

FIG. 2 is a view taken out for easy confirmation of the configuration of each part shown in FIG. (A) shows the first sector 10, (B) shows the second sector 20, and (C) shows the third sector 30. Further, FIG. 3 is a view showing the regulation plate 40 included in the present shirting device 1 taken out. FIG. 3 shows the relationship between the operating pin 5 and the restricting plate 40 in the fully open state, the fully closed state, and the small throttle state from the top. As shown in FIG. 1, the restricting plate 40 is set to be able to rotate a predetermined range by using the fixed shaft 21 of the second sector 20 as well. The restricting plate 40 has a cam groove on a plate-like member as in the other three sectors. As will be described later, this cam groove is formed as a braking cam groove 42 that increases the load at a predetermined position so as to limit the movement of the actuating pin 5.

The restriction plate 40 restricts the movement of the actuating pin 5 at that position when the shutter plate 4 is fully closed as shown in the middle part of FIG. 3, ie, when the shirt opening 4 is closed by the sector. It is a member added. To explain this point in more detail, when the actuating pin 5 moves the sectors 10, 20, 30 to close the shutter opening 4, the braking cam groove 42 of the restricting plate 40 keeps the position. Increase the load and apply braking to limit the movement of the actuating pin 5. As illustrated in FIG. 3, the braking cam groove 42 is formed by a cam curve in which a long hole meanders. Position where the operating pin 5 corresponds to full open (5-1) force full close When it comes to the position (5-2), the actuating pin 5 abuts on the side of the projection, that is, the operating pin 5 increases the angle formed by the advancing direction of the actuating pin 5 and the tangent of the cam curve that abuts. The braking is performed by increasing the load for movement of 5.

That is, the operation pin 5 can move smoothly from the fully open position (5-1) of the upper stage toward the fully closed state of the middle stage. However, as shown in the middle of Fig. 3, when the actuating pin 5 comes near the position corresponding to the fully closed state, it reaches the meandering part indicated by the reference symbol NR, and as shown by the arrow R, the regulating plate 40 itself slightly shakes. Move. The operation pin 5 is loaded and braked by the operation of the restricting plate 40 and the shape of the cam groove 42 for braking. As a result, in the shirting device 1 of this embodiment, the sectors 10, 20, and 30 that are swung based on the movement of the operating pin 5 are over in the vicinity of the fully closed position (5-2) where the shirt opening 4 is closed. I will not run. Therefore, the state in which the sector opens and re-exposure in the fully closed state and the state in which the sector bounces can be reliably suppressed.

Then, when moving from the fully closed state in the middle of FIG. 3 to the small throttle shown in the lower part, the actuating pin 5 starts to move with the stopped state force, so it is hardly affected by the braking cam groove 42. Transition smoothly. However, conversely, when returning to the lower small-diaphragm position (5-3) force fully closed position (5-2), the actuating cam groove 42 as in the case of full closing to full closing, the operating pin 5 When is in the fully closed position (5-2), braking is applied to the movement. That is, the shape of the braking cam groove 42 is designed so as to limit the movement of the actuating pin 5 when the other position forces also come to the fully closed position (5-2). When moving from -2) to the small aperture position (5-3) or the fully open position (5-1), the load of the operating pin 5 is varied to allow free movement.

The position of the restricting plate 40 changes because the actuating pin 5 engages with the braking cam groove 42 and rotates around the fixed shaft 21. When the regulating plate 40 moves in this manner, it is formed in a shape that does not block the shutter opening 4. FIG. 3 shows the step motor 7 and its rotor shaft 7R, which is not shown in the other drawings, and the arm 8 whose one end is fixed to the rotor shaft 7R. The periphery of the step motor 7 will be described in detail with reference to the following FIG.

[0029] FIG. 6 (A) shows the operating pins 5 for driving the sectors 10, 20, 30 and the regulation plate 40, and the operation thereof. FIG. 6 is an enlarged view of a peripheral portion of a step motor 7 driving a pin 5; The three sectors 10, 20, and 30 are disposed on the front side of the shirt substrate 3 along the surface of the substrate. In these sectors, the shirt substrate 3 side force is also the first shirter blade 10, the second shirter blade 20, and the diaphragm blade 30. A restricting plate 40 is further disposed on the front side of these sectors. A step motor 7 is disposed on the back side of the shutter substrate 3.

Although the positions of the holes can not be confirmed in this FIG. 6 (A), the first sector 10 engages the holes engaged with the fixed shaft 11 provided on the substrate 3 and the operating pin 5 extended with the rotor shaft 7R. The cam groove 12 described above is provided. Similarly, the second sector 20 is provided with a hole fitted to the fixed shaft 21 provided on the substrate 3 and a cam groove 22 engaged with the operating pin 5 whose rotor shaft 7R also extends. Further, the diaphragm blade 30 is provided with a hole engaged with the fixed shaft 31 provided on the substrate 3 and a cam groove 32 engaged with the operation pin 5 extended from the rotor shaft 7R. Each of the sectors 10, 20, 30 swings along a unique trajectory as the actuation pin 5 pivots. The restricting plate 40 is rotatably engaged with the fixed shaft 21 of the sector 20.

A radially extending arm portion 8 is connected to a rotor shaft 7 R extending from a rotor 701 of the step motor 7 disposed on the back side of the substrate 3. The operating pin 5 described above is connected to the end of the arm 8. The operating pin 5 extends to the opposite side through an opening 710 provided on the shirter substrate 3 side. Cam grooves 12, 22, 32 provided on each of the sectors 10, 20, 30 and a braking cam groove 42 of the restricting plate 40 are engaged with the actuating pin 5 that has come out to the front side. Therefore, when the rotor shaft 7R of the step motor 7 rotates, the actuating pin 5 rotates in conjunction with this, and the sectors 10, 20, 30 further swing along a predetermined trajectory. Further, the regulation plate 40 slightly swings, and as described above, the movement of the actuating pin 5 in the vicinity of the fully closed position is applied with a load and braked.

In the step motor 7, a U-shaped stator 704 is disposed so as to surround the outer periphery of the rotor 701, and coils 702 and 703 are wound on both sides of the stator. The state of the stator 704 shown in FIG. 6 is shown from both ends. The control circuit 705 is connected to the coils 702 and 703 to control the driving of the step motor 7.

FIG. 6 (B) is a diagram showing the movement range CR of the operation pin 5 described above. The operating pin 5 is formed on the force substrate 3 which can rotate 360 ° as the rotor shaft 7R rotates. The opening 710 is fan-shaped, and an abutment member 709 for restricting the movement of the arm portion 8 is disposed. Thus, the operating pin 5 pivots within the predetermined range RE.

Further, the overall movement of the shirting device 1 will be described with reference to FIGS. 1 (fully open), 4 (fully closed) and 5 (small aperture). In the fully open state of FIG. 1, the operating pin 5 is at the left end of the moving range, and at this time, the sectors 10, 20, 30 are moved to the position to open the shirt opening 4 based on the shape of the cam grooves 12, 22, 32. Next, as shown in FIG. 4, when the operating pin 5 is moved to the position corresponding to the full closing, each sector 10, 20, 30 is also moved to the position to close the shutter opening 4. At this time, in the present shirting device 1, the actuating pin 5 is in a state where the smooth movement is braked by the braking cam groove 42 of the regulating plate 40. Therefore, the sectors 10, 20, and 30 slow down in the vicinity of the position shown in FIG. 4 (fully closed) and stably stop without causing a shift as in the prior art. Therefore, there are no re-exposure and bounce problems.

Then, in this shirter device 1, when moving the operating pin 5 in the fully closed position shown in FIG. 4 further to the right, it moves smoothly to become the small squeezed state shown in FIG. 5 here force fully closed When the operating pin 5 is returned to its position, the load on the operating pin 5 increases near the fully closed position by the braking cam groove 42, and the braking force is decelerated. Therefore, the sectors 10, 20, and 30 always stop stably at the position shown in FIG. 4 (fully closed) without causing misalignment. Therefore, the problem of reexposure and bounce does not occur even at the fully closed position at this time! ,.

As described above, since the shirting device 1 according to the first embodiment includes the restricting plate 40, the operating pin which has moved the sector to the fully closed position is braked and can be decelerated and stopped. Therefore, unlike the prior art, there is no problem that the sector re-exposures with a shift of 4 shutter openings. Therefore, according to an optical apparatus such as a digital still camera including the present shirt as a part, a clear image can be taken.

Example 2

A second embodiment of the present invention will be further described based on FIGS. 7 to 11. In the first embodiment described above, in addition to the three sectors, the restricting plate 40 for restricting the movement of the operating pin 5 is further disposed. On the other hand, in the second embodiment, the cam groove of the existing sector is used to realize the configuration to obtain the same effect as the regulating plate 40. Therefore, the configuration can be simplified in the second embodiment.

In the present embodiment, among the plurality of sectors incorporated in the shirt device, a cam groove of a predetermined sector Is designed in a special shape. That is, when the shutter opening is fully closed, this cam groove functions in the same manner as the restricting plate 40 of the first embodiment. This point will be described with reference to FIG. FIG. 7 is an enlarged view of one sector 50 (predetermined sector) included in the present shirting device 2. As shown in FIG. The sector 50 is rotatable about a fixed shaft 51 and is provided with a cam groove 52. The cam groove 52 is engaged with an operating pin 5 that rotates in the counterclockwise direction (CCW). The operating pin 5 moves to the CCW side as it moves from (A) to (C).

When the operating pin 5 is pivoted to swing the sector 50 from the state of (A) above, a large load RP (a reaction force from the sector 50 to the operating pin 5 as shown in the lower part of FIG. 7) ) Occurs. Then, when the sector 50 swings in the CW direction and becomes the state of (B), the reaction force RP becomes smaller. Furthermore, if it is attempted to continuously shift from the state (B) to the state (C), the sector rotates in the CW direction, but the operation pin 5 tries to move the sector in the CCW direction. In order to increase the reaction force RP again. Here, the state to be particularly focused on is the transition from (B) to (C). Since the fully closed state is formed when the operating pin 5 is in the position (B), the operating pin 5 is braked and decelerated by the reaction force RP even if it is further moved. In the second embodiment, based on such a theory, the same groove effect as the restricting plate 40 of the first embodiment is obtained by utilizing the cam groove of the incorporated sector.

When sector 50 as shown in FIG. 7 is incorporated in the shirt, (B) in the vicinity of forming a totally closed state by another sector or a plurality of sectors including this sector 50, (B) Set the relationship between the operating pin 5 and the sector 50 so as to be in the state shown by. In this way, the cam groove 52 of the sector 50 decelerates the operating pin 5 when it is in the fully closed state, thereby suppressing the overrun state. A plurality of sectors (predetermined sectors) as shown in FIG. 7 may be incorporated into one shirting device. That is, when the fully open state force is also fully closed, the cam groove of sector A is used to obtain the braking effect as described above, and when the small throttle state force is fully closed, the cam groove of other sector B is obtained. You may do so. Of course, the shape of the cam groove 52 may be designed to exert the braking effect whenever one sector 50 is fully closed.

The shirt device 2 of the second embodiment will be described in detail with reference to FIGS. 8 to 11. FIG. 8 shows a state in which the shutter device 2 according to the second embodiment is shifted to a fully open state fully closed state. FIG. FIG. 9 is a diagram showing three sectors included in the shirting device 2 of FIG. FIG. 10 is a view showing how the shutter device 2 shifts the small-diaphragm state force to the fully closed state. FIG. 11 is a view showing the state when the shirting device 2 is in the fully closed state. In the shirt apparatus 2, the sector 50 shown in FIG. 7 is incorporated as the first sector. Also, the second sector 60 is provided with a cam groove that similarly performs a braking function.

First, with reference to FIG. 8, an outline of the configuration of the shirting device 2 will be described. Although this shirting device 2 also has a three-sector configuration, it does not include the restriction plate as in the first embodiment. That is, the shirt device 2 comprises three sectors 50, 60, 70. Sector 50 is the first shirter blade, and sector 60 is the second shirter blade. Sector 70 is an aperture blade with a small aperture hole 73. Here, in order to make it easy to confirm each sector, a portion relating to the first sector 50 is shown by a solid line, a portion relating to the second sector 60 is shown by a length, a broken line, and a portion relating to the third sector 70 is shown by a dotted line.

The first sector 50 is configured to be rotatable around the fixed shaft 51, the second sector 60 is configured to be rotatable about the fixed shaft 61, and the third sector 70 is configured to rotate around the fixed shaft 71. It is configured freely. A cam groove is formed in each of the sectors 50, 60, 70 as in the case of the first embodiment, and is configured to swing by drawing a predetermined trajectory by the operating pin 5. This point is the same as that of the first embodiment described above. FIG. 9 is a diagram taken out for easy confirmation of the configuration of each part shown in FIG. (A) shows the first sector 50, (B) shows the second sector 60, and (C) shows the third sector 70.

As described later, in the shirt apparatus of this embodiment, the cam groove 52 of the sector 50 is designed to exert the function of braking the actuating pin 5 described above when the small throttle state force is fully closed. It is done. In addition, the cam groove 62 of the sector 60 is designed to exhibit the function of braking the actuating pin 5 described above when the fully open state force is also in the fully closed state.

As shown in FIG. 8, the cam groove 62 of the second sector 60 performs a characteristic function when changing from full open to full close, and as shown in FIG. 10, it changes from small aperture to full close. The second embodiment differs from the first embodiment in that the cam groove 52 of the first sector 50 performs a characteristic function when it is performed. The state of each figure will be described in order. However, in FIG. 8 and FIG. 10, in order to facilitate understanding of the features of the second embodiment, cam grooves for restricting the movement of the operating pin 5 are shown, and illustration of other cam grooves is omitted. On the other hand, FIG. 11 shows the fully closed state of the shirting device 2, in which all the sectors are shown. Shown so that you can check the cam groove of.

FIG. 8 shows how the full open state force of the shirt opening 4 also changes to the full close state. In the state shown in this figure, the second sector 60 is such that the movement of the actuating pin 5 is restricted by the cam groove 62 which is not blocked by the shutter opening 4. That is, in the case shown in FIG. 8, the first opening 50 is closed by the first sector 50 and the third sector 70, and at this time, the cam groove 62 of the second sector brakes further movement of the actuating pin 5. . Similarly, when the small throttle state force shown in FIG. 10 is also shifted to the fully closed state, the shutter opening 4 is closed by the second sector 60 and the third sector 70, and at this time the cam groove 52 of the first sector 50 Restrict movement of the actuating pin 5 further.

That is, in the second embodiment, the first sector 50 and the second sector 60 are configured to perform two functions. Specifically, the cam groove 52 of the first sector 50 brakes further movement of the actuating pin 5 in the same direction in the fully closed state when the sector 50 itself does not contribute to the shutter opening 4. It has a shape. Similarly, the cam groove 62 of the second sector 60 is formed to stop the operating pin 5 in the fully closed position when the sector 60 itself does not contribute to shielding the shutter opening 4. According to this embodiment, the operating pin 5 can be reliably stopped in the fully closed position by simply changing the existing sector without adding another member. Also in the second embodiment, a situation in which the operating pin 5 overruns can be prevented, so that the problem that the sector opens and re-exposures or bounces in the fully closed position does not occur. Therefore, a clear image can be taken even with an optical apparatus such as a digital still camera including the present shirting device 2 as a part.

Although the shirt apparatus including three sectors is illustrated in the above-described embodiment, the present invention is not limited to this! / ヽ. Even if it comprises two sectors, a shirting device having a configuration according to the above-described embodiment can be manufactured. For example, in a shirter structure, an abutment member may be arranged to define the inclination angle of the sector. If the sector strongly abuts on this member, it may be rebounded or broken. When the configuration of the embodiment described above is adopted, the actuating pin can be stopped at the desired position, so that the effect of suppressing the contact force to the contact member can be obtained.

Although the preferred embodiment of the present invention has been described above in detail, the present invention relates to a specific example of the present invention. Various modifications and changes are possible within the scope of the subject matter of the present invention set forth in the claims which are not limited to the embodiment.

Claims

The scope of the claims

[1] a substrate having a shirt opening,

A plurality of sectors provided with cam grooves and swingably arranged on the substrate and opening and closing the shutter opening;

An actuation member engaged with the cam groove to swing the sector;

In the area where the sector fully closes the shirt opening when the shirt opening is fully closed.

V, a shirt provided with a braking member for applying a load so as to suppress swinging of the actuating member

[2] The shirt according to claim 1, wherein the braking member is moved by being pressed by the actuating member to a region where the sector fully closes the shirt opening when the shirt opening is fully closed.

[3] The braking member is rotatably disposed coaxially with the sector on the substrate, includes a plate-like member provided with a braking cam groove engaged with the actuating member, and is pressed by the actuating member. 3. The shirt according to claim 2, wherein the shirt opening is not closed when it is turned.

[4] The shirt apparatus according to any one of claims 1 to 3, wherein the braking member swings the sector to make the shirt opening fully open, fully closed, and small.

[5] The braking cam groove is formed such that an angle formed by a rotational direction of the actuating member and a tangential direction in which the actuating member abuts on the braking cam groove is large. The shirt apparatus according to claim 3 or 4, wherein the rocking load is increased.

[6] a substrate having a shirt opening;

An actuation member engaged with the cam groove to swing the sector;

It is arranged so as to be rotatable around a fixed axis provided on the substrate, the operating member engages with the braking force groove, and the operating member makes the sector to make the shirt opening fully closed, Shirter device provided with the braking member formed so as to increase an angle formed by the moving direction of the actuating member and the tangential direction of the braking cam groove with which the actuating member abuts

[7] A substrate having a shirt opening, and a plurality of sectors provided with cam grooves and swingably disposed on the substrate and opening and closing the shirt opening.

An actuation member engaged with the cam groove to swing the sector;

A cam groove of a predetermined sector is formed so as to apply a load so as to suppress the swing of the actuating member in a region where the sector fully closes the shirt opening when the shirt opening is fully closed. , R shirt equipment.

[8] The cam groove includes a V shape, and when the actuating member reaches the V-shaped valley portion

The shirt apparatus according to claim 7, wherein the sector fully closes the shirt opening.

[9] a substrate having a shirt opening;

An actuation member engaged with the cam groove to swing the sector;

When the actuating member reaches the V-shaped valley when the cam groove includes a V-shape and the actuating member makes the sector to make the shutter opening fully closed. The shirt device wherein the sector fully closes the shirt opening.

[10] The shirt apparatus according to any one of claims 6 to 9, wherein the actuating member swings the sector to make the shirt opening fully open, fully closed, and reduced.

[11] An optical apparatus comprising the shirting device according to any one of claims 1 to 10.