JP2018138982A - Blade driving device and optical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade driving device and an optical instrument that can ensure stable impact absorption capacity irrespective of an environment temperature and can ensure miniaturization.SOLUTION: An FP shutter 2 comprises: a blade mechanism 11 supported by a substrate 10; and a buffer member 13 in contact with the blade mechanism at a retracted position. The blade mechanism 11 is moved between the retracted position retracted from an opening 15 and a development position. The buffer member 13 is brought into contact with the blade mechanism 11 at the retracted position to restrict a movement toward the opening 15 of the blade mechanism 11. The buffer member 13 comprises at least two buffer parts having different temperature characteristics of modulus of repulsion elasticity.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a blade driving device and an optical apparatus.

  An optical device such as a digital camera is equipped with a focal plane shutter (hereinafter referred to as an FP shutter) in order to control exposure to an image sensor. The FP shutter has a substrate having an opening (image frame), and a front curtain blade and a rear curtain blade that are movable along the opening surface of the opening and open and close the opening.

  Some FP shutters include a buffer member at the curtain travel end of the moving range of the blade driving device. The buffer member is made of an elastic material such as rubber. For example, when the front curtain blade comes into contact with the buffer member, the impact of the front curtain blade in contact with the buffer member is absorbed by the elastic material, and bounce (bounce back) of the front curtain blade is suppressed.

By the way, the impact resilience (that is, the shock absorbing capacity) of the buffer member changes under a low temperature or high temperature environment. Therefore, it is conceivable to affect the suppression of the bounce amount of the blade at the curtain travel end in a low temperature or high temperature environment.
Further, since the resilience elastic modulus changes, it is conceivable that the impact of the blade against the buffer member may affect the durability of the blade.
For example, Patent Document 1 below discloses a cushion member in which a cavity is formed. By forming a cavity in the buffer member, it is possible to suppress a change in the resilience modulus to some extent under a low temperature or high temperature environment.
Alternatively, it is conceivable to increase the size of the buffer member to suppress the change in the resilience modulus under a low or high temperature environment to some extent.

JP 2011-170226 A

  However, by forming a cavity in the buffer member, the structure (shape) of the buffer member becomes complicated and the buffer member becomes large. For this reason, it can be considered that miniaturization of the FP shutter is hindered. Further, the size reduction of the FP shutter is also hindered when the change in the resilience elastic modulus is suppressed by increasing the size of the buffer member.

  Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a blade driving device and an optical apparatus that can secure a stable shock absorbing ability regardless of the environmental temperature and can ensure downsizing. To do.

  In order to solve the above problems, a blade driving device according to one embodiment of the present invention is supported by a substrate, is movable along an opening surface of an opening, and is retracted from the opening and the opening. And a movement of the blade mechanism by abutting against the blade mechanism at least one of the retracted position and the deployed position. A buffer member, and the buffer member includes at least two first buffer portions and second buffer portions having different temperature characteristics of rebound resilience.

  According to this configuration, the buffer member is provided in at least one of the retracted position and the deployed position. The buffer member includes at least two first buffer portions and second buffer portions. Each buffer portion has a different temperature characteristic of rebound resilience. Therefore, for example, a high-temperature characteristic material having a rebound resilience that is lower in the high temperature region than in the low temperature region is used as the first buffer portion. A low-temperature characteristic material having a low impact resilience can be used. Thereby, by combining the first buffer portion and the second buffer portion, the rebound resilience of the buffer member can be kept low over a wide range from the low temperature region to the high temperature region. As a result, it is possible to ensure a stable shock absorbing capability of the buffer member regardless of the environmental temperature from the low temperature region to the high temperature region.

Moreover, the buffer member can be formed in a relatively small size by securing a stable shock absorbing capability of the buffer member. Thereby, size reduction of the FP shutter can be ensured.
Furthermore, since the shock absorbing member can secure a stable shock absorbing ability regardless of the environmental temperature, there is no possibility of affecting the durability of the shock absorbing member due to the shock caused by the contact of the blade mechanism to the shock absorbing member.

In the above aspect, the blade mechanism is configured such that the base end is supported by the substrate, and the first buffer portion and the second buffer portion are arranged side by side in the extending direction from the base end to the tip end.
According to this structure, the 1st buffer part and the 2nd buffer part were arrange | positioned along with the extension direction of the blade | wing mechanism. Therefore, the first buffer portion and the second buffer portion can be opposed to the blade mechanism. That is, it becomes easy to contact by both the 1st buffer part and the 2nd buffer part. Therefore, the rebound elastic modulus of the buffer member can be kept low at a wide range of environmental temperatures from the low temperature region to the high temperature region by combining the first buffer portion and the second buffer portion. Thereby, it is possible to satisfactorily secure the shock absorbing ability of the stable buffer member regardless of the environmental temperature from the low temperature region to the high temperature region.

In the above aspect, the first buffer portion and the second buffer portion are continuously arranged in the extending direction.
According to this structure, the buffer member which combines the 1st buffer part of high temperature characteristic material and the 2nd buffer part of low temperature characteristic material integrally is formed. Thus, by integrating the high temperature characteristic material and the low temperature characteristic material, the rebound resilience of the buffer member can be satisfactorily kept low in a wide range of environmental temperatures from the low temperature region to the high temperature region.
Moreover, the number of parts can be reduced by integrating the first buffer portion and the second buffer portion.

In the above aspect, the first buffer portion and the second buffer portion are arranged with an interval in the extending direction.
According to this structure, the 1st buffer part of the high temperature characteristic material and the 2nd buffer part of the low temperature characteristic material have arrange | positioned at intervals. A 1st buffer part and a 2nd buffer part can be arrange | positioned separately. Thereby, the freedom degree of arrangement | positioning (layout) of a 1st buffer part and a 2nd buffer part can be raised.

In the above aspect, a base end of the blade mechanism is supported by the substrate, and a buffer portion having a low hardness is disposed at a tip opposite to the base end among the first buffer portion and the second buffer portion. .
According to this configuration, the blade mechanism is cantilevered by supporting the base end at the opening. Therefore, for example, when the blade mechanism returns to the retracted position, the blade mechanism moves largely in the retracted direction due to the inertia, compared to the proximal end side of the blade mechanism.
Therefore, a buffer portion having low hardness is disposed at the tip opposite to the base end of the first buffer portion and the second buffer portion. Therefore, the buffer portion with low hardness is more likely to be crushed than the buffer portion on the base end side. Accordingly, the blade mechanism is easily brought into contact with both the first buffer portion and the second buffer portion.

The said aspect WHEREIN: The said 1st buffer part and the said 2nd buffer part are overlapped and comprised by the direction to which the said blade | wing mechanism moves.
According to this configuration, it is possible to apply a pressing force evenly from the blade mechanism to the first buffer unit and the second buffer unit by overlapping the first buffer unit and the second buffer unit. Thereby, the impact resilience of the buffer member can be satisfactorily kept low in a wide range of environmental temperatures from the low temperature region to the high temperature region.

  In the above aspect, the blade mechanism includes an arm that is swingably supported by the substrate, and a blade that is supported by the arm and moves between the retracted position and the deployed position, and the buffer member Is configured to be able to contact both the arm and the blade, and a length dimension of a portion of the buffer member that contacts the blade is set to be larger than a length dimension of a portion that contacts the arm. Yes.

Here, for example, when the blade mechanism returns to the open position (retracted position) by the exposure operation, the blade mechanism moves largely in the direction of the buffer portion compared to the arm side due to the influence of inertia.
So, according to this structure, the length dimension of the part which a blade | wing contact | abuts among the buffer members was made larger than the length dimension of the part which an arm contact | abuts. Thereby, the pressing force when the blade is in contact with the buffer member can be satisfactorily absorbed by the buffer member.

  In the above aspect, the blade mechanism includes an arm that is swingably supported by the substrate, and a blade that is supported by the arm and moves between the retracted position and the deployed position, and the buffer member Is configured to be able to contact both the arm and the blade, and the thickness dimension in the moving direction of the blade in the portion of the buffer member that contacts the blade is the arm in the portion that contacts the arm. It is set larger than the thickness dimension in the moving direction.

  According to this structure, the thickness dimension of the part contact | abutted to a blade | wing is made larger than the thickness dimension of the part contact | abutted to an arm among buffer members. Therefore, the pressing force when the blade greatly moved under the influence of inertia comes into contact with the buffer member can be satisfactorily absorbed by the buffer member.

An optical apparatus according to an aspect of the present invention includes the blade driving device according to the above aspect.
According to this configuration, the blade driving device according to the above aspect is provided. Therefore, it is possible to provide an optical apparatus that can secure a stable shock absorbing capability of the buffer member regardless of the environmental temperature from the low temperature region to the high temperature region, and can ensure miniaturization of the FP shutter.
Furthermore, the optical device according to an aspect of the present invention includes a control unit that causes the blade mechanism to abut on the buffer member configured by at least two first buffer units and second buffer units having different temperature characteristics of rebound resilience. It has.

  According to one aspect of the present invention, the temperature characteristics of the resilience modulus of the first buffer portion and the second buffer portion of the buffer member are made different. As a result, it is possible to ensure a stable shock absorbing capability of the buffer member regardless of the environmental temperature, and further, it is possible to form the buffer member in a relatively small size, and to ensure miniaturization of the FP shutter.

1 is a block diagram of an optical apparatus according to a first embodiment of the present invention. It is a top view which shows the FP shutter which concerns on 1st Embodiment. FIG. 3 is a plan view showing a front curtain drive lever, a front curtain connecting pin, and a guide groove in the FP shutter according to the first embodiment. In the FP shutter according to the first embodiment, it is a graph showing the relationship between the rebound resilience and temperature of the first blade buffer and the second blade buffer. In the FP shutter according to the first embodiment, it is a plan view schematically illustrating a state in which the leading blade is in contact with the blade cushioning member. It is a top view which illustrates typically the state where the front curtain blade contacted the blade buffer member of the comparative example. (A)-(c) is a top view explaining the state which the front-curtain blade | wing contact | abutted the blade | wing buffer member in the FP shutter which concerns on 1st Embodiment. In the FP shutter according to the first embodiment, a plane for explaining a state in which the first blade cushioning portion of the blade cushioning member is disposed on the leading end side of the curtain blade and the second blade cushioning portion is disposed on the proximal end side of the leading blade. FIG. In the modification 2 of 1st Embodiment, it is a top view which shows the state which interposed the 3rd blade | wing buffer part between the 1st blade | wing buffer part and the 2nd blade | wing buffer part. It is a top view which shows the FP shutter which concerns on 2nd Embodiment. It is a top view which shows the FP shutter which concerns on 3rd Embodiment. It is a top view which shows the FP shutter which concerns on 4th Embodiment. In the modification 2 of 4th Embodiment, it is a top view which shows the state which comprised the blade | wing buffer member by the 1st blade | wing buffer part, the 2nd blade | wing buffer part, and the 3rd blade | wing buffer part. In the FP shutter according to the embodiment, it is a plan view showing a state where a buffer member is provided at the end of the guide groove.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
[Optical equipment]
FIG. 1 is a block diagram of an optical apparatus 1 according to the first embodiment.
As shown in FIG. 1, the optical apparatus 1 is used as, for example, a mirrorless single-lens camera, a digital single-lens reflex camera, or the like. The optical device 1 includes an FP shutter (blade driving device) 2, a control unit 3, and an image sensor 4.

The control unit 3 governs the overall operation of the optical device 1. The control unit 3 includes, for example, a CPU, a ROM, a RAM, and the like.
The image sensor 4 is, for example, a CCD or a CMOS image sensor. The image sensor 4 converts a subject image formed by light into an electrical signal.
The optical device 1 also includes a lens (not shown) for image formation.

<FP shutter>
FIG. 2 is a plan view showing the FP shutter 2. FIG. 3 is a plan view showing the front curtain drive lever 22, the front curtain connecting pin 35, and the guide groove 37 of the FP shutter 2.
As shown in FIGS. 2 and 3, the FP shutter 2 mainly includes a substrate 10, a leading blade mechanism 11, a trailing blade mechanism 12, and a buffer member 13. Operations of the leading blade mechanism 11 and the trailing blade mechanism 12 are controlled by the control unit 3.
The substrate 10 is formed with an opening 15 penetrating the substrate 10 in the optical axis P direction. The substrate 10 defines a sector region between the substrate 10 and a blade receiving plate (not shown) disposed on one side of the optical axis P direction with respect to the substrate 10.
A partition plate 14 is disposed between the substrate 10 and the blade receiving plate. The partition plate 14 partitions the space in which the leading blade mechanism 11 and the trailing blade mechanism 12 travel in the sector region in the optical axis P direction. Note that the blade receiving plate and the partition plate 14 are formed with an opening (not shown) having the same shape as the opening 15 in a plan view as viewed from the optical axis P direction.

(Lead curtain blade mechanism)
The front curtain blade mechanism 11 converts a rotational movement around the front curtain axis O1 extending along the optical axis P direction into a slide movement in a direction perpendicular to the optical axis P (X direction shown in FIG. 2) by a so-called parallel link. Then, the opening 15 is opened and closed. Specifically, the front curtain blade mechanism 11 includes a front curtain drive lever 22, front curtain arms (first front curtain arm 23 and second front curtain arm 24), and front curtain blade 25. In the front curtain blade mechanism 11, the front curtain arms 23 and 24 and the front curtain blade 25 are disposed in the sector area described above.

The front curtain drive lever 22 rotates around the front curtain axis O1 with the rotation of the front curtain electromagnetic actuator. Specifically, the front curtain drive lever 22 extends in a direction orthogonal to the optical axis P direction. The base end portion 22a of the front curtain drive lever 22 is connected to the rotary shaft 32 of the front curtain electromagnetic actuator. A front curtain connecting pin 35 extending in one direction in the direction of the optical axis P projects from the front end 22 b of the front curtain drive lever 22. The front curtain connecting pin 35 faces the sector region through a guide groove 37 formed in the substrate 10.
The guide groove 37 is formed in an arc shape extending along the circumferential direction around the front curtain axis O1. That is, as the front curtain drive lever 22 rotates, the front curtain connecting pin 35 described above moves in the guide groove 37, so that the rotational range of the front curtain drive lever 22 is defined.

The first front curtain arm 23 extends in a direction perpendicular to the optical axis P direction. The base end portion of the first front curtain arm 23 is swingably connected to the above-described front curtain connecting pin 35 and the rotary shaft 32 of the front curtain electromagnetic actuator. That is, the first front curtain arm 23 is configured to be rotatable around the front curtain axis O1 in accordance with the rotation of the front curtain electromagnetic actuator.
The second front curtain arm 24 extends following the first front curtain arm 23 in a direction orthogonal to the optical axis P direction. The base end portion of the second front curtain arm 24 is supported so as to be swingable around a support pin 39 protruding from the substrate 10 in one direction of the optical axis P.

  The leading blade 25 has a plurality of (for example, four) blades 25a to 25d. Each blade 25a to 25d extends in a direction orthogonal to the X direction (Y direction in FIG. 2) in plan view. The base ends of the blades 25a to 25d are rotatably connected to both the first front curtain arm 23 and the second front curtain arm 24 described above. Each blade 25a to 25d has an opening surface of the opening 15 between the overlapped state (the state shown in FIG. 2) overlapping in a plan view and the unfolded state developed in a plan view as the front curtain electromagnetic actuator is driven. Transition along. In the overlapped state, the blades 25a to 25d are retracted in one direction in the X direction with respect to the opening 15 so that the leading blade 25 is in an open position (hereinafter referred to as a retracted position).

(Rear curtain blade mechanism)
As shown in FIG. 2, the trailing blade mechanism 12 is disposed on the other side in the X direction with respect to the leading blade mechanism 11. The rear curtain blade mechanism 12 converts the rotational movement around the rear curtain axis extending along the optical axis P direction into a slide movement in the X direction by a so-called parallel link, similar to the front curtain blade mechanism 11 described above, The part 15 is opened and closed. The trailing blade mechanism 12 is formed symmetrically with the leading blade mechanism 11 with respect to a plane orthogonal to the X direction. Therefore, in the following description, the description of the same configuration as that of the leading blade mechanism 11 is simplified.

The rear curtain blade mechanism 12 includes a rear curtain drive lever 52, a rear curtain arm (first rear curtain arm 53 and second rear curtain arm 54), and a rear curtain blade 55. The rear curtain drive lever 52 rotates with the rotation of the rear curtain electromagnetic actuator. A rear curtain connecting pin 65 extending in one direction in the optical axis P direction protrudes from the front end of the rear curtain drive lever 52.
The first rear curtain arm 53 has a base end connected to the rear curtain connecting pin 65 and the rotary shaft 62 of the rear curtain electromagnetic actuator. The second rear curtain arm 54 is supported so that its base end portion can turn around a support pin 69 protruding from the substrate 10 in one direction of the optical axis P.

  The rear curtain blade 55 has a plurality of (for example, four) blades 55a to 55d. The base ends of the blades 55a to 55d are rotatably connected to both the first rear curtain arm 53 and the second rear curtain arm 54 described above. Each blade 55a to 55d shifts between a superposed state overlapping in a plan view and a developed state (shown in FIG. 2) deployed in a plan view as the rear curtain electromagnetic actuator 51 is driven. In the overlapped state, the blades 55a to 55d are retracted to the other side in the X direction with respect to the opening portion 15, so that the trailing blades 55 are in the retracted position.

When the blades 55a to 55d are deployed, the blades 55a to 55d cover the opening 15 from one side in the optical axis P direction, so that the trailing blades 55 are in a closed position (hereinafter referred to as a deployed position). The rear curtain blade 55 is held in a non-energized state at the retracted position and the deployed position by the detent torque (magnetic attractive force) of the rear curtain electromagnetic actuator 51. In the present embodiment, when the optical apparatus 1 is powered off, the trailing blade 55 is deenergized and held at the retracted position by the detent torque. The number of the blades 25a to 25d and 55a to 55d of the leading blade 25 and the trailing blade 55 is not limited to four, and can be changed as appropriate.
In a state where the blades 25 a to 25 d are deployed at the deployment position, the blades 25 a to 25 d overlap at least a part of the opening 15.

<Shutter operation>
At the time of shooting, when the release button (not shown) is pressed while the optical apparatus 1 is powered on, the leading blade 25 moves toward the deployed position. Specifically, when the front curtain electromagnetic actuator is energized, the rotation shaft 32 rotates in one direction (counterclockwise) around the front curtain axis O1. As a result, the front blade 25 is slid in the closing direction (the other in the X direction), so that the blades 25a to 25d are in the deployed state. As a result, the leading blade 25 is in the deployed position, and the opening 15 is closed by the leading blade 25.

Subsequently, an exposure operation is performed. Specifically, the energization direction of the front curtain electromagnetic actuator is switched, and the rotary shaft 32 is rotated in the other direction (clockwise) around the front curtain axis O1. Then, the leading blade 25 is slid in the opening direction (one in the X direction).
After a lapse of a predetermined time from the start of the movement of the leading blade 25, the trailing blade 55 is moved toward the deployed position. Specifically, similarly to the operation method of the leading blade 25, the rotating shaft 62 rotates in one direction (clockwise) by energizing the trailing curtain electromagnetic actuator. Thereby, it slides and moves toward the closing direction (one side in the X direction). At this time, the light passes through while the front curtain blade 25 opens the opening 15 and then the rear curtain blade 55 closes the opening 15, so that the image sensor 4 (see FIG. 1) is exposed and exposed. Is completed.

After the exposure operation is completed, the energization direction of the rear curtain electromagnetic actuator is switched, and the rotating shaft 62 is rotated in the other direction (counterclockwise). Then, the trailing blade 55 is slid toward the other side in the X direction, so that the trailing blade 55 returns to the retracted position.
Thus, the shutter operation ends.

(Buffer member)
The buffer member 13 is disposed between the substrate 10 and the blade receiving plate and outside the partition plate 14 in a plan view as viewed from the optical axis P direction. The direction in which the leading blade 25 moves from the deployed position to the retracted position will be referred to as the retracting direction (that is, the opening direction).

  The buffer member 13 includes an arm buffer member 71 that abuts the downstream side of the first front curtain arm 23 in the retracted direction (the lower side in FIG. 2) at the retracted position of the front curtain blade 25, and the downstream side of the front curtain blade 25 in the retracted direction. And a blade cushioning member 72 that abuts the blade. In other words, the buffer member 13 is provided at the curtain travel end of the moving range of the FP shutter 2. In other words, the control unit 3 causes the front curtain blade mechanism 11 and the rear curtain blade mechanism 12 to contact the buffer member 13 to suppress the movement of these blade mechanisms.

The arm buffer member 71 is supported by the substrate 10 along the lower inclined side 23a of the first front curtain arm 23 when the front curtain blade 25 is returned from the deployed position to the retracted position H1. The lower inclined side 23a extends in a direction inclined downward with respect to the Y direction from the base end 23b to the front end 23c.
The arm buffering member 71 includes a first arm buffering portion 74 disposed on the base end 23b side of the first front curtain arm 23, and a second arm buffering portion 75 disposed on the distal end 23c side of the first front curtain arm 23. Have The 1st arm buffer part 74 and the 2nd arm buffer part 75 are arrange | positioned so that it may continue along with the lower inclination side 23a, and along with the lower inclination side 23a.

  Here, “continuous” includes a state in which the first arm buffer portion 74 and the second arm buffer portion 75 are in contact with each other, and a state in which the first arm buffer portion 74 and the second arm buffer portion 75 are integrally formed. .

  The first arm buffer portion 74 is formed in a rectangular shape with a high-temperature characteristic material, and the upper surface 74a is disposed so as to be able to contact the lower inclined side 23a. The second arm buffering portion 75 is formed in a rectangular shape with a low-temperature characteristic material, and is disposed so that the upper surface 75a contacts the lower inclined side 23a. The first arm buffer portion 74 and the second arm buffer portion 75 are formed in the same shape. The arm buffer member 71 is formed in a rectangular body by the first arm buffer portion 74 and the second arm buffer portion 75.

  Thus, by arranging the arm buffer member 74 of the high temperature characteristic material and the second arm buffer portion 75 of the low temperature characteristic material side by side, the rebound elastic modulus of the arm buffer member 71 can be changed over a wide range of environments from the low temperature region to the high temperature region. The temperature can be kept low. Further, when the arm buffering member 71 and the second arm buffering unit 75 are integrated, the number of components can be reduced.

The first arm buffer portion 74 and the second arm buffer portion 75 are preferably formed of nitrile rubber (NBR), isobutylene isoprene rubber (IIR), or the like that does not contain a sulfur compound. It is also possible to add an additive to NBR, IIR or the like.
Moreover, the corrosive effect | action to the metal material which adjoins can be prevented by not containing a sulfur compound in the 1st arm buffer part 74 and the 2nd arm buffer part 75. FIG.

  The hardness of the upper surface 75a of the second arm buffer portion 75 is set lower than the hardness of the upper surface 74a of the first arm buffer portion 74. These hardnesses may be set by surface treatment by heating, application of a surface hardening paint, or the like, and by using a material whose material hardness of the second arm buffer portion 75 is lower than that of the first arm buffer portion 74. It may be set.

The blade cushioning member 72 is supported along the lower side 25e of the leading blade 25 when the leading blade 25 is returned from the deployed position to the retracted position H1. The lower side 25e extends in a direction orthogonal to the X direction (that is, the Y direction).
The blade cushioning member 72 includes a first blade cushioning portion 77 disposed on the base end 25 f side of the leading blade 25 and a second blade cushioning portion 78 disposed on the tip 25 g side of the leading blade 25. The 1st blade | wing buffer part 77 and the 2nd blade | wing buffer part 78 are arrange | positioned so that it may extend along with the extended direction of the lower side 25e along the lower side 25e.

  Here, “continuous” includes a state in which the first blade cushioning portion 77 and the second blade cushioning portion 78 are in contact with each other, and a state in which the first blade cushioning portion 77 and the second blade cushioning portion 78 are integrally formed. . In the present embodiment, the length dimension of the blade cushioning member 72 that abuts the front curtain blade 25 is set to be greater than the length dimension of the arm cushioning member 71 that abuts the first front curtain arm 23. Here, the length dimension of the blade cushioning member 72 refers to a dimension in the longitudinal direction (the direction from the base end 25f to the tip 25g) of the leading blade 25 where the blade cushioning member 72 contacts the leading blade 25. The length dimension of the arm cushioning member 71 refers to the dimension in the longitudinal direction of the first leading curtain arm 23 (the direction from the base end 23b to the leading end 23c) where the arm cushioning member 71 contacts the first leading curtain arm 23.

  The first blade buffer portion 77 is formed of a high-temperature characteristic material in a rectangular shape, and the upper surface 77a is disposed so as to be able to contact the lower side 25e. The 2nd blade | wing buffer part 78 is formed in a rectangular body with a low temperature characteristic material, and is arrange | positioned so that the upper surface 78a may contact | abut to the lower side 25e. The 1st blade | wing buffer part 77 and the 2nd blade | wing buffer part 78 are formed in the same shape. The first blade cushioning portion 77 and the second blade cushioning portion 78 are arranged and configured so that the blade cushioning member 72 has a rectangular shape.

  Thus, by arranging the first blade cushioning portion 77 of the high temperature characteristic material and the second blade cushioning portion 78 of the low temperature characteristic material side by side, the rebound resilience of the blade cushioning member 72 is increased from a low temperature region to a high temperature region. Can be satisfactorily kept low at the ambient temperature. Moreover, when the 1st buffer part and the 2nd buffer part are integrated, the number of parts can be reduced.

  The first blade buffer portion 77 and the second blade buffer portion 78 are preferably formed of nitrile rubber (NBR), isobutylene-isoprene rubber (IIR), etc. that do not contain a sulfur compound. It is also possible to add an additive to NBR, IIR or the like. Moreover, the corrosive effect | action to the adjacent metal material can be prevented by not containing a sulfur compound in the 1st blade | wing buffer part 77 and the 2nd blade | wing buffer part 78. FIG.

  Here, the surface hardness of the upper surface 78 a of the second blade buffer portion 78 is set to be lower than the surface hardness of the upper surface 77 a of the first blade buffer portion 77. These hardnesses may be set by surface treatment by heating, application of a surface hardening paint, or the like, and by using a material in which the material hardness of the second blade buffer portion 78 is lower than the material hardness of the first blade buffer portion 77. It may be set.

  Next, an example in which the first blade cushioning portion 77 and the second blade cushioning portion 78 of the blade cushioning member 72 suppress the bounce of the leading blade 25 will be described with reference to FIGS. 5 to 8, the blade cushioning member 72 is shown in an enlarged manner in order to facilitate understanding of the operation of the blade cushioning member 72.

FIG. 4 is a graph showing the relationship between the rebound resilience of the first blade cushioning portion 77 and the second blade cushioning portion 78 and the environmental temperature. In FIG. 4, the vertical axis represents the impact elastic modulus, and the horizontal axis represents the environmental temperature (° C.).
The graph G1 shows the relationship between the rebound resilience of the first blade cushioning portion 77 formed of the high temperature characteristic material and the environmental temperature. The graph G2 shows the relationship between the rebound resilience of the second blade cushioning portion 78 formed of the low temperature characteristic material and the environmental temperature. The graph G3 shows the relationship between the rebound resilience and the temperature obtained by combining the rebound resiliences of the first blade cushioning portion 77 and the second blade cushioning portion 78.

As shown in FIG. 4, the first blade cushioning portion 77 shown by the graph G <b> 1 has a low rebound resilience rate in a region where the environmental temperature is high. On the other hand, the first blade cushioning portion 77 has a high resilience modulus in a region where the environmental temperature is low. That is, the first blade cushioning portion 77 has an excellent shock absorbing capability in a region where the environmental temperature is high.
The second blade cushioning portion 78 indicated by the graph G2 has a low resilience modulus in a region where the environmental temperature is low. On the other hand, the second blade cushioning portion 78 has a high resilience modulus in a region where the environmental temperature is high. That is, the second blade cushioning portion 78 has an excellent impact absorbing capability in a region where the environmental temperature is low.
Thus, the 1st blade | wing buffer part 77 and the 2nd blade | wing buffer part 78 are formed with the material provided with the characteristic which conflicts.

  The graph G3 is a graph showing characteristics in a state where the first blade cushioning portion 77 and the second blade cushioning portion 78 are combined. As shown in the graph G3, by combining the first blade cushioning portion 77 and the second blade cushioning portion 78, the rebound resilience is kept low in both the region where the environmental temperature is low and the region where the environmental temperature is high, A constant rebound resilience can be obtained regardless of the environmental temperature.

FIG. 5 is a plan view schematically illustrating a state in which the lower side 25e of the leading blade 25 is in contact with the upper portion of the blade cushioning member 72. FIG.
As shown in FIG. 5, by the exposure operation of the FP shutter, the leading blade 25 is driven in the retracting direction and returns to the retracting position H1 as indicated by the arrow A. The leading blade 25 is supported at the base end 25f, and the tip 25g is a free end. The front curtain blade 25 is cantilevered at the base end 25f. Therefore, the leading blade 25 is moved more greatly in the direction of arrow A than the proximal end 25f side on the tip 25g side of the leading blade 25 by the influence of inertia.

As described above, the hardness of the upper surface 78 a of the second blade buffer portion 78 is set to be lower than the hardness of the upper surface 77 a of the first blade buffer portion 77. Therefore, the second blade cushioning portion 78 is more easily crushed than the first blade cushioning portion 77. Accordingly, the lower side 25e of the leading blade 25 is easily brought into contact (contact) with both the upper surface 78a of the second blade cushioning portion 78 and the upper surface 77a of the first blade cushioning portion 77. Therefore, the resilience elastic modulus of the first blade cushioning portion 77 and the second blade cushioning portion 78 contributes to the repulsive force to the lower side 25e of the leading blade 25.
Here, the hardness and the rebound resilience are not necessarily correlated, and there are materials having a low rebound resilience even if the hardness is high. Therefore, for example, by adjusting the hardness and the rebound resilience of the first blade cushioning portion 77 and the second blade cushioning portion 78, the rebound resilience rates of the first blade cushioning portion 77 and the second blade cushioning portion 78 are adjusted first. It becomes possible to contribute to the repulsive force to the curtain blade 25.

FIG. 6 is a plan view schematically illustrating a state in which the lower side 25e of the leading blade 25 is in contact with the upper portion of the blade cushioning member 100 of the comparative example.
As shown in FIG. 6, the blade cushioning member 100 of the comparative example includes a first blade cushioning portion 101 and a second blade cushioning portion 102. The 1st blade | wing buffer part 101 is formed in the rectangular body with the high temperature characteristic material. The 2nd blade | wing buffer part 102 is formed in the rectangular body with the low temperature characteristic material. The hardness of the upper surface 102 a of the second blade buffer 102 is set higher than the hardness of the upper surface 101 a of the first blade buffer 101.
Therefore, the second blade cushioning portion 102 is less likely to be crushed than the first blade cushioning portion 101. For this reason, the lower side 25e of the leading blade 25 is unlikely to contact the upper surface 101a of the first blade buffer 101. Therefore, it is difficult to make the rebound resilience of the first blade cushioning portion 101 contribute to the rebound force on the lower side 25e of the leading blade 25. That is, the region where the first blade cushioning portion 101 of the high temperature characteristic material and the second blade cushioning portion 102 of the low temperature characteristic material are in contact with the lower side 25e of the leading blade 25 is biased to the second blade cushioning portion 102 of the low temperature characteristic material. The repulsive force from the blade cushioning member 100 acting on the blades 25 is almost occupied by the repulsive force from the second blade cushioning portion 102 of the low-temperature characteristic material.

  On the other hand, in the blade cushioning member 72 shown in FIG. 5, the hardness of the upper surface 78 a of the second blade cushioning portion 78 is set lower than the hardness of the upper surface 77 a of the first blade cushioning portion 77. Therefore, the lower side 25e of the leading blade 25 is easily brought into contact with both the upper surface 78a of the second blade cushioning portion 78 and the upper surface 77a of the first blade cushioning portion 77. Thereby, compared with the case where there is no hardness difference of the upper surface 77a of the 1st blade | wing buffer part 77, and the upper surface 78a of the 2nd blade | wing buffer part 78, the resilience elastic modulus of the 1st blade | wing buffer part 77 and the 2nd blade | wing buffer part 78 is. Can contribute to the repulsive force to the lower side 25e of the leading blade 25. That is, the repulsive force can be transmitted to the front blade 25 in all regions where the first blade buffer portion 77 of the high temperature characteristic material and the second blade buffer portion 78 of the low temperature characteristic material are in contact with the lower side 25e of the front blade 25. it can.

  Similarly, the hardness of the upper surface 75a of the second arm buffer portion 75 is set lower than the hardness of the upper surface 74a of the first arm buffer portion 74. Therefore, the lower inclined side 23 a of the first arm 23 is easily brought into contact with both the upper surface 75 a of the second arm buffer portion 75 and the upper surface 74 a of the first arm buffer portion 74. Thereby, the rebound resilience of the first arm buffer portion 74 and the second arm buffer portion 75 compared to the case where there is no hardness difference between the upper surface 74a of the first arm buffer portion 74 and the upper surface 75a of the second arm buffer portion 75. Can contribute to the repulsive force to the lower inclined side 23a of the first arm 23. That is, the repulsive force is applied to the first arm 23 in all regions where the first arm buffer portion 74 of the high temperature characteristic material and the second arm buffer portion 75 of the low temperature characteristic material are in contact with the lower inclined side 23a of the first arm 23. Can communicate.

  FIG. 7 is a plan view illustrating a state in which the lower side 25e of the leading blade 25 is in contact with the upper portion of the blade cushioning member 72. FIG. Fig.7 (a) shows the A position (namely, position where environmental temperature is low) of FIG. FIG. 7B shows the position B in FIG. 4 (that is, the position where the environmental temperature is high). FIG.7 (c) shows the C position (namely, environmental temperature intermediate position) of FIG.

As shown in FIG. 7 (a), the leading blade 25 is driven in the retracting direction by the exposure operation and returns to the retracting position H1 as indicated by an arrow A. At this time, the leading blade 25 moves largely in the direction of arrow A in the leading edge 25g side of the leading blade 25 compared to the base end 25f side due to the influence of inertia.
The hardness of the upper surface 78 a of the second blade buffer portion 78 is set to be lower than the hardness of the upper surface 77 a of the first blade buffer portion 77. Therefore, the upper surface 78 a of the second blade cushioning portion 78 is more easily crushed than the upper surface 77 a of the first blade cushioning portion 77. Thus, the lower side 25e of the leading blade 25 is easily brought into contact with both the upper surface 78a of the second blade cushioning portion 78 and the upper surface 77a of the first blade cushioning portion 77. Therefore, the resilience elastic modulus of the first blade cushioning portion 77 and the second blade cushioning portion 78 contributes to the repulsive force to the leading blade 25.

FIG. 7A shows the state of the A position (see FIG. 4) where the environmental temperature is low. Therefore, the 1st blade | wing buffer part 77 has a high impact resilience rate, as shown to the graph G1 of FIG. Thereby, the repulsive force F1 of the 1st blade | wing buffer part 77 is large, and an impact absorption capability is restrained low. On the other hand, the second blade cushioning portion 78 has a low rebound resilience as shown by the graph G2 in FIG. Therefore, the repulsive force F2 of the 2nd blade | wing buffer part 78 is small, and it can make a shock absorption capability high.
When the repulsive force F1 of the first blade cushioning portion 77 and the repulsive force F2 of the second blade cushioning portion 78 are combined, the repulsive force F of the blade cushioning member 72 is obtained. That is, as shown in the graph G3 in FIG. 4, a stable rebound resilience can be secured in the low temperature region. As a result, in the low temperature region, the impact absorbing ability of the first blade cushioning portion 77 and the impact absorbing ability of the second blade cushioning portion 78 are combined, and a stable impact absorbing ability that does not fluctuate due to environmental temperature changes is obtained.

FIG. 7B shows a state at the B position (see FIG. 4) where the environmental temperature is high. Therefore, the first blade cushioning portion 77 has a low rebound resilience as shown by the graph G1 in FIG. Thereby, the repulsive force F3 of the 1st blade | wing buffer part 77 is small, and it can make a shock absorption capability high. On the other hand, as shown in the graph G2 of FIG. Therefore, the repulsive force F4 of the 2nd blade | wing buffer part 78 is large, and an impact absorption capability is low.
When the repulsive force F3 of the first blade cushioning portion 77 and the repulsive force F4 of the second blade cushioning portion 78 are combined, the repulsive force F of the blade cushioning member 72 is obtained. That is, as shown in the graph G3 in FIG. 4, a stable rebound resilience can be ensured in the high temperature region. Thereby, in the high temperature region, the impact absorbing ability of the first blade cushioning portion 77 and the impact absorbing capability of the second blade cushioning portion 78 are combined, and a stable impact absorbing capability that does not fluctuate due to environmental temperature changes is obtained.

FIG. 7C shows a state at the C position (see FIG. 4) where the environmental temperature is intermediate. Therefore, the first blade cushioning portion 77 is located between the position where the resilience elastic modulus is high and the position where it is low as shown in the graph G1 of FIG. Therefore, the repulsive force F5 of the first blade cushioning portion 77 has an intermediate magnitude, and the impact absorption capability also becomes an intermediate capability. Similarly, the 2nd blade | wing buffer part 78 is located in the middle of the position where a resilience elastic modulus is high, as shown to the graph G2 of FIG. Therefore, the repulsive force F5 of the 2nd blade | wing buffer part 78 becomes an intermediate | middle magnitude | size, and an impact absorption capability also becomes an intermediate capability.
When the repulsive force F5 of the first blade cushioning portion 77 and the repulsive force F5 of the second blade cushioning portion 78 are combined, the repulsive force F of the blade cushioning member 72 is obtained. That is, as shown in the graph G3 of FIG. 4, a stable rebound resilience can be ensured in the intermediate region. Thereby, in the intermediate region, the shock absorbing capacity of the first blade buffering portion 77 and the shock absorbing capability of the second blade buffering portion 78 are combined, and a stable shock absorbing capability that does not fluctuate due to environmental temperature changes is obtained. As described above, according to the present embodiment, the shock absorption capacity is not easily changed from a high temperature to a low temperature, and a stable shock absorption capacity can be obtained.

As shown in FIGS. 4 and 7 (a) to 7 (c), by adjusting the resilience elastic modulus and hardness of the first blade cushioning portion 77 and the second blade cushioning portion 78, it is stable regardless of the environmental temperature. The shock absorption ability that was able to be secured. That is, the bound amount of the leading blade 25 can be kept constant.
Further, since the blade cushioning member 72 can secure a stable shock absorbing ability regardless of the environmental temperature, the blade cushioning member 72 can be formed into a small rectangular body. Therefore, the blade cushioning member 72 can be reduced in size. Thereby, size reduction of FP shutter 2 is securable.
In addition, since the blade cushioning member 72 can secure a stable shock absorbing ability regardless of the environmental temperature, there is no possibility that the impact of the blade 25 against the blade cushioning member 72 will affect the durability of the blade 25.

Further, the first blade buffer portion 77 and the second blade buffer portion 78 are arranged side by side in the extending direction of the lower side 25e of the leading blade 25. Therefore, the first blade buffer portion 77 and the second blade buffer portion 78 can be made to face the lower side 25e of the leading blade 25. That is, the lower side 25e of the leading blade 25 is more easily brought into contact with both the first blade cushioning portion 77 and the second blade cushioning portion 78.
Therefore, by combining the first blade cushioning portion 77 and the second blade cushioning portion 78, the rebound resilience of the blade cushioning member 72 can be kept low over a wide range from the low temperature region to the high temperature region. Accordingly, it is possible to satisfactorily ensure the stable shock absorbing ability of the blade cushioning member 72 regardless of the environmental temperature from the low temperature region to the high temperature region.

  Further, the blade cushioning member 72 is formed by integrally combining the first blade cushioning portion 77 made of the high temperature characteristic material and the second blade cushioning portion 78 made of the low temperature property material. Thus, by integrating the high-temperature characteristic material and the low-temperature characteristic material, the number of parts can be reduced and the rebound resilience of the blade cushioning member 72 can be satisfactorily kept low over a wide range from the low temperature region to the high temperature region.

FIG. 8 illustrates a state in which the first blade cushioning portion 83 of the blade cushioning member 82 is disposed on the leading end 25g side of the curtain blade 25 and the second blade cushioning portion 84 is disposed on the proximal end 25f side of the leading blade 25. It is a top view.
The 1st blade | wing buffer part 83 is formed in the rectangular body with the high temperature characteristic material. The 2nd blade | wing buffer part 84 is formed in the rectangular body with the low temperature characteristic material. The hardness of the upper surface 83a of the first blade buffer part 83 is set lower than the hardness of the upper surface 84a of the first blade buffer part 84.
FIG. 8A shows the position A in FIG. 4 (that is, the position where the environmental temperature is low). FIG. 8B shows the position B in FIG. 4 (that is, the position where the environmental temperature is high). FIG. 8C shows the position C in FIG. 4 (that is, the position where the ambient temperature is intermediate).

FIG. 8A shows the state of the A position (see FIG. 4) where the environmental temperature is low. Therefore, the 1st blade | wing buffer part 83 has a high impact resilience rate, as shown to the graph G1 of FIG. Thereby, the repulsive force F6 of the 1st blade | wing buffer part 83 is large, and an impact absorption capability is restrained low. On the other hand, the second blade cushioning portion 84 has a low rebound resilience as shown by the graph G2 in FIG. Therefore, the repulsive force F7 of the 2nd blade | wing buffer part 84 is small, and can improve the impact absorption capability.
When the repulsive force F6 of the first blade buffer portion 83 and the repulsive force F7 of the second blade buffer portion 84 are combined, the repulsive force F of the blade buffer member 82 is obtained. That is, as shown in the graph G3 in FIG. 4, a stable rebound resilience can be secured in the low temperature region. As a result, in the low temperature region, the impact absorbing capability of the first blade cushioning portion 83 and the impact absorbing capability of the second blade cushioning portion 84 are combined, and a stable impact absorbing capability that does not fluctuate due to environmental temperature changes is obtained.

FIG. 8B shows a state at the B position (see FIG. 4) where the environmental temperature is high. Therefore, the first blade cushion 83 has a low rebound resilience as shown in the graph G1 of FIG. Thereby, the repulsive force F8 of the 1st blade | wing buffer part 83 is small, and it can make a shock absorption capability high. On the other hand, the 2nd blade | wing buffer part 84 has a high impact resilience rate, as shown to the graph G2 of FIG. Therefore, the repulsive force F9 of the 2nd blade | wing buffer part 84 is large, and an impact absorption capability is low.
When the repulsive force F8 of the first blade buffer portion 83 and the repulsive force F9 of the second blade buffer portion 84 are combined, the repulsive force F of the blade buffer member 82 is obtained. That is, as shown in the graph G3 in FIG. 4, a stable rebound resilience can be ensured in the high temperature region. As a result, in the high temperature region, the impact absorbing ability of the first blade cushioning portion 83 and the impact absorbing ability of the second blade cushioning portion 84 are combined, and a stable impact absorbing ability that does not vary due to environmental temperature changes is obtained.

FIG. 8C shows a state at the C position (see FIG. 4) where the environmental temperature is intermediate. Therefore, the first blade cushioning portion 83 is located between the position where the rebound resilience is high and the position where it is low, as shown in the graph G1 of FIG. Therefore, the repulsive force F10 of the first blade cushioning portion 83 has an intermediate magnitude, and the shock absorption capability is also an intermediate capability. Similarly, the 2nd blade | wing buffer part 84 is located in the middle of the position where a resilience elastic modulus is high, as shown to the graph G2 of FIG. Therefore, the repulsive force F10 of the 2nd blade | wing buffer part 84 becomes an intermediate | middle magnitude | size, and an impact absorption capability also becomes an intermediate | middle capability.
When the repulsive force F10 of the first blade cushioning portion 83 and the repulsive force F10 of the second blade cushioning portion 84 are combined, the repulsive force F of the blade cushioning member 72 is obtained. That is, as shown in the graph G3 of FIG. 4, a stable rebound resilience can be ensured in the intermediate region. Thereby, in the middle region, the shock absorbing ability of the first blade cushioning portion 83 and the shock absorbing ability of the second blade cushioning portion 84 are matched, and a stable shock absorbing ability that does not fluctuate due to environmental temperature changes is obtained. As described above, according to the present embodiment, it is difficult for the shock absorbing ability to vary from high temperature to low temperature, and a stable shock absorbing ability can be obtained.

As shown in FIGS. 4 and 8 (a) to 8 (c), by adjusting the resilience elastic modulus and hardness of the first blade cushioning portion 83 and the second blade cushioning portion 84, it is stable regardless of the environmental temperature. The shock absorption ability that was able to be secured. That is, the bound amount of the leading blade 25 can be kept constant.
Further, since the blade cushioning member 82 can secure a stable shock absorbing ability regardless of the environmental temperature, the blade cushioning member 82 can be formed into a small rectangular body. Therefore, the blade cushioning member 82 can be reduced in size. Thereby, size reduction of FP shutter 2 is securable.
In addition, since the blade cushioning member 82 can secure a stable shock absorbing ability regardless of the environmental temperature, there is no possibility that the impact of the blade 25 against the blade cushioning member 82 will affect the durability of the blade 25.

Further, the first blade buffer portion 83 and the second blade buffer portion 84 are arranged side by side in the extending direction of the lower side 25e of the leading blade 25. As a result, similarly to the blade cushioning member 72 (see FIG. 7), the stable shock absorbing capability of the blade cushioning member 82 can be secured satisfactorily regardless of the environmental temperature from the warm region to the high temperature region.
Furthermore, by combining the first blade cushioning portion 83 of the high temperature characteristic material and the second blade cushioning portion 84 of the low temperature characteristic material, the number of parts can be reduced in the same manner as the blade cushioning member 72 (see FIG. 7). Thus, the rebound resilience of the blade cushioning member 82 can be satisfactorily kept low in a wide range of environmental temperatures from the low temperature region to the high temperature region.

Returning to FIG. 2, the first front curtain arm 23 returns to the retracted position H <b> 2 as indicated by an arrow A upon completion of the exposure operation, similarly to the front curtain blade 25. At this time, the front end 23c of the first front curtain arm 23 moves greatly in the direction of arrow A compared to the base end 23b side due to inertia.
The hardness of the upper surface 75a of the second arm buffer portion 75 is set lower than the hardness of the upper surface 74a of the first arm buffer portion 74. Therefore, the second arm buffering portion 75 is more easily crushed than the first arm buffering portion 74. As a result, the lower inclined side 23 a of the first front curtain arm 23 is easily brought into contact with both the upper surface 75 a of the second arm buffer portion 75 and the upper surface 74 a of the first arm buffer portion 74. Therefore, the resilience elastic modulus of the first arm buffer portion 74 and the second arm buffer portion 75 contributes to the repulsive force to the lower inclined side 23a of the first front curtain arm 23.

Thereby, it is possible to match the rebound resilience of the first arm shock absorber 74 of the arm shock absorber 71 with the rebound resilience of the second arm shock absorber 75. As a result, the shock absorbing capability of the first arm buffering portion 74 and the shock absorbing capability of the second arm buffering portion 75 are combined, and a stable shock absorbing capability can be obtained regardless of the environmental temperature.
Further, since the arm cushioning member 71 can secure a stable shock absorbing ability regardless of the environmental temperature, the arm cushioning member 71 can be formed into a small rectangular body. Therefore, the arm buffer member 71 can be reduced in size. Thereby, size reduction of FP shutter 2 is securable.

  Further, when the blade mechanism 11 returns to the retracted position by the exposure operation, the blade mechanism 11 moves largely toward the buffer member 13 in the direction of the buffer member 13 than the base end 25f side due to the influence of inertia. In the present embodiment, as described above, the length dimension of the blade cushioning member 72 is set larger than the length dimension of the arm cushioning member 71. Thereby, the pressing force when the leading blade 25 contacts the blade cushioning member 72 can be satisfactorily absorbed by the blade cushioning member 72.

  Further, by providing the optical device 1 with the FP shutter 2, it is possible to ensure a stable shock absorbing capability of the buffer member 13 regardless of the environmental temperature from the low temperature region to the high temperature region, and to ensure the miniaturization of the FP shutter 2. Device 1 can be provided.

(Modification)
FIG. 9 is a plan view showing a state in which the third blade cushioning portion 79 is interposed between the first blade cushioning portion 77 and the second blade cushioning portion 78.
Although 1st Embodiment demonstrated the example which arranged the 1st blade | wing buffer part 77 and the 2nd blade | wing buffer part 78 of the blade | wing buffer member 72 continuously, it does not limit to this. For example, as shown in FIG. 9, it is possible to interpose a third blade cushioning portion 79 between the first blade cushioning portion 77 and the second blade cushioning portion 78. The third blade cushion 79 is set to a rebound resilience between the rebound resilience of the first blade cushion 77 and the rebound resilience of the second blade cushion 78, for example.
Similarly, it is also possible to interpose a third arm buffer portion 81 between the first arm buffer portion 74 and the second arm buffer portion 75.
Thus, by providing three types of buffer portions having different rebound resilience, it is possible to adjust the resilience resilience in accordance with the FP shutter 2, and the application can be expanded. Moreover, it is also possible to provide three or more types of buffer portions having different rebound resilience rates.

  In the above embodiment, the case where the upper surface 77a of the first blade cushioning portion 77 and the upper surface 78a of the second blade cushioning portion 78 have a hardness difference has been described, but the hardness difference may not be present. Similarly, there may be no difference in hardness between the upper surface 74a of the first arm buffer portion 74 and the upper surface 75a of the second arm buffer portion 75.

  In the above modification, the lower surface 25e of the leading blade 25 and the first blade buffer 77 are set by setting the hardness of the upper surface of the second blade buffer 78 lower than the hardness of the upper surface of the first blade buffer 77. , The upper surface of the second blade cushioning portion 78, and the upper surface of the third blade cushioning portion 79 may be more easily brought into contact with each other. Thereby, the resilience elastic modulus of the 1st blade | wing buffer part 77, the 2nd blade | wing buffer part 78, and the 3rd blade | wing buffer part 79 can be made to contribute to the repulsive force to the lower side 25e of the front curtain blade 25. That is, the three types of the first blade cushioning portion 77, the second blade cushioning portion 78, and the third blade cushioning portion 79 having different resilience elastic modulus are subjected to the repulsive force in all the regions in contact with the lower side 25 e of the leading blade 25. It can be transmitted to the blade 25. As a result, the rebound resilience of the blade cushioning member can be suppressed to a lower level in a wide range of environmental temperatures from the low temperature region to the high temperature region. In addition, the hardness of the upper surface of the buffer member on the tip 25g side of the leading blade 25 is set lower than the hardness of the upper surface of the buffer member on the base end 25f side among the plurality of blade buffer portions. That's fine. The same applies to the first arm buffer portion 74, the second arm buffer portion 75, and the third arm buffer portion 81.

  Next, the FP shutter 110 according to the second to fifth embodiments will be described with reference to FIGS. In the FP shutters 110, 120, 130, and 150 of the second to fifth embodiments, the same or similar components as those of the FP shutter 2 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. To do.

[Second Embodiment]
FIG. 10 is a plan view showing the FP shutter 110 according to the second embodiment.
As shown in FIG. 10, the FP shutter 110 is the same as the FP shutter 2 of the first embodiment except that the buffer member 113 is different from the buffer member 13 of the first embodiment.
The buffer member 113 includes an arm buffer member 114 that contacts the downstream side of the first front curtain arm 23 in the retracted direction and a blade buffer member that contacts the downstream side of the front curtain blade 25 in the retracted direction at the retracted position H1 of the front curtain blade 25. 115.

  The arm buffering member 114 includes a first arm buffering unit 74 and a second arm buffering unit 75 arranged at intervals along the lower inclined side 23a of the first front curtain arm 23. This is the same as the arm cushioning member 71 of the embodiment. The blade cushioning member 115 includes a first blade cushioning portion 77 and a second blade cushioning portion 78 arranged at intervals along the lower side 25e of the leading blade 25, and the other configurations are the blades of the first embodiment. The same as the buffer member 72.

According to the FP shutter 110 of the second embodiment, as in the FP shutter 2 of the first embodiment, a stable shock absorbing capability can be obtained regardless of the environmental temperature.
Further, the first arm buffering portion 74 and the second arm buffering portion 75 of the arm buffering member 114 are arranged at an interval, and the first blade buffering portion 77 and the second blade buffering portion 78 of the blade buffering member 115 are spaced from each other. Is placed. Therefore, the 1st blade | wing buffer part 77 and the 2nd blade | wing buffer part 78 can be arrange | positioned separately. Thereby, the freedom degree of arrangement | positioning (layout) of the 1st blade | wing buffer part 77 and the 2nd blade | wing buffer part 78 can be raised.

  In the present embodiment, the length dimension of the blade cushioning member 115 is set larger than the length dimension of the arm cushioning member 114. Thereby, the pressing force when the leading blade 25 contacts the blade cushioning member 115 can be satisfactorily absorbed by the blade cushioning member 115. Here, the length dimension of the blade cushioning member 115 is the sum of the longitudinal dimensions of the leading blade 25 where the first blade cushioning portion 77 and the second blade cushioning portion 78 are in contact with the leading blade 25. . The length dimension of the arm cushioning member 115 is the sum of the longitudinal dimensions of the first front curtain arm 23 in which the first arm cushioning section 74 and the second arm cushioning section 75 are in contact with the first front curtain arm 23. Say.

[Third Embodiment]
FIG. 11 is a plan view showing an FP shutter 120 according to the third embodiment.
As shown in FIG. 11, the FP shutter 120 is the same as the FP shutter 2 of the first embodiment except that the buffer member 123 is different from the buffer member 13 of the first embodiment.
The buffer member 123 includes an arm buffer member 124 that contacts the downstream side of the first curtain blade 23 in the retracted direction and a blade buffer member that contacts the downstream side of the leading blade 25 in the retracted direction at the retracted position H1 of the leading blade 25. 125.

The arm buffering member 124 is formed by forming the second arm buffering portion 75 longer than the first arm buffering portion 74 along the lower inclined side 23a of the first leading curtain arm 23, and the other configuration is the arm of the first embodiment. The same as the buffer member 71.
The first front curtain arm 23 returns to the retracted position H2 as shown by the arrow A by the exposure operation. At this time, the front end 23c of the first front curtain arm 23 moves greatly in the direction of arrow A compared to the base end 23b side due to inertia.
Therefore, by forming the second arm buffering portion 75 longer than the first arm buffering portion 74, the rebound resilience of the first arm buffering portion 74 and the second arm buffering portion 75 will be the lower inclined side of the first front curtain arm 23. It contributes more favorably to the repulsive force to 23a.

The blade cushioning member 125 is formed by forming the second blade cushioning portion 78 longer than the first blade cushioning portion 77 along the lower side 25e of the leading blade 25, and the other configuration is the blade cushioning member of the first embodiment. 72.
The leading blade 25 returns to the retracted position H1 as shown by the arrow A by the exposure operation. At this time, the leading blade 25 moves largely in the direction of arrow A in the leading edge 25g side of the leading blade 25 compared to the base end 25f side due to the influence of inertia.
Therefore, by forming the second blade cushioning portion 78 longer than the first blade cushioning portion 77, the resilience elastic modulus of the first blade cushioning portion 77 and the second blade cushioning portion 78 is repulsive to the lower side 25e of the leading blade 25. Contributes better to force.
As described above, according to the buffer member 123 of the third embodiment, by forming the second arm buffer portion 75 and the second blade buffer portion 78 long, the buffer member 123 has a more stable impact regardless of the environmental temperature. Absorption capacity can be secured.

  In the present embodiment, the length dimension of the blade cushioning member 125 is set larger than the length dimension of the arm cushioning member 124. Thereby, the pressing force when the leading blade 25 contacts the blade cushioning member 125 can be satisfactorily absorbed by the blade cushioning member 125. Here, the length dimension of the blade cushioning member 125 refers to the sum of the longitudinal dimensions of the leading blade 25 where the first blade cushioning portion 77 and the second blade cushioning portion 78 are in contact with the leading blade 25. The length dimension of the arm cushioning member 124 is the sum of the longitudinal dimensions of the first front curtain arm 23 in which the first arm cushioning section 74 and the second arm cushioning section 75 are in contact with the first front curtain arm 23. .

[Fourth Embodiment]
FIG. 12 is a plan view showing an FP shutter 130 according to the fourth embodiment.
As shown in FIG. 12, the FP shutter 130 is the same as the FP shutter 2 of the first embodiment except that the buffer member 133 is different from the buffer member 13 of the first embodiment.
The buffer member 133 includes an arm buffer member 134 that contacts the downstream side of the first curtain blade 23 in the retracted direction and a blade buffer member that contacts the downstream side of the leading blade 25 in the retracted position at the retracted position H1 of the leading blade 25. 135.

The arm buffering member 134 is configured such that the first arm buffering unit 136 and the second arm buffering unit 137 are overlapped in the moving direction of the first front curtain arm 23.
The first arm buffer portion 136 is formed of a high temperature characteristic material in a rectangular shape, and the second arm buffer portion 137 is overlaid on the upper surface. The second arm buffering portion 137 is formed of a low-temperature characteristic material in a rectangular shape, and is arranged so that the upper surface 137a contacts the lower inclined side 23a of the first front curtain arm 23. The first arm buffer portion 136 and the second arm buffer portion 137 are formed in the same shape. The arm buffer member 134 is formed in a rectangular shape by the first arm buffer portion 136 and the second arm buffer portion 137. The first arm buffering portion 136 and the second arm buffering portion 137 can be formed as separate members, or can be formed integrally.
As described above, the first arm cushioning portion 136 and the second arm cushioning portion 137 are overlapped, so that the arm cushioning member 134 can be equally pressed from the first front curtain arm 23.

Further, the blade cushioning member 135 is configured by overlapping the first blade cushioning portion 138 and the second blade cushioning portion 139 in the direction in which the leading blade 25 moves.
The first blade cushioning portion 138 is formed in a rectangular shape with a high-temperature characteristic material, and the second blade cushioning portion 139 is overlaid on the upper surface. The second blade cushioning portion 139 is formed in a rectangular shape with a low-temperature characteristic material, and is disposed so that the upper surface 139a contacts the lower side 25e of the leading blade 25. The 1st blade | wing buffer part 138 and the 2nd blade | wing buffer part 139 are formed in the same shape. A blade cushioning member 135 is formed in a rectangular shape by the first blade cushioning portion 138 and the second blade cushioning portion 139. The 1st blade | wing buffer part 138 and the 2nd blade | wing buffer part 139 can also be formed by another member, and can also be formed integrally. As described above, the first blade cushioning portion 138 and the second blade cushioning portion 139 are overlapped, so that the blade cushioning member 135 can be equally pressed from the leading blade 25.

  According to the FP shutter 130 of the fourth embodiment, the arm buffer member 134 can be equally pressed from the first front curtain arm 23, and the blade buffer member 135 can be equally pressed from the front blade 25. be able to. Therefore, the rebound resilience of the arm cushioning member 134 and the blade cushioning member 135 can be satisfactorily suppressed at a wide range of environmental temperatures from the low temperature region to the high temperature region. Thereby, the buffer member 133 can secure a more stable shock absorbing capability regardless of the environmental temperature.

  In the present embodiment, the length dimension of the blade cushioning member 135 is set larger than the length dimension of the arm cushioning member 134. Thereby, the pressing force when the leading blade 25 contacts the blade cushioning member 135 can be satisfactorily absorbed by the blade cushioning member 135. Here, the length dimension of the blade cushioning member 135 refers to the dimension in the longitudinal direction of the leading blade 25 where the second blade cushioning portion 139 contacts the leading blade 25. The length dimension of the arm cushioning member 134 refers to a dimension in the longitudinal direction of the first leading curtain arm 23 at which the second arm cushioning portion 137 contacts the first leading curtain arm 23.

(Modification)
FIG. 13 is a plan view showing a state in which the blade cushioning member is configured by the first blade cushioning portion 141, the second blade cushioning portion 142, and the third blade cushioning portion 143.
In the fourth embodiment, the example in which the first blade cushioning portion 138 and the second blade cushioning portion 139 of the blade cushioning member 135 are overlapped has been described, but the present invention is not limited to this. For example, as shown in FIG. 13, the blade cushioning member can be constituted by a first blade cushioning portion 141, a second blade cushioning portion 142, and a third blade cushioning portion 143. The 1st blade | wing buffer part 141 is a high temperature characteristic material. The second blade cushion 142 is a low temperature characteristic material. The third blade buffer 143 is a material having characteristics between the first blade buffer 141 and the second blade buffer 142. In the present modification, the first blade cushioning portion 141 and the second blade cushioning portion 142 are continuously arranged side by side, and the third blade cushioning portion 143 is overlapped in the moving direction of the leading blade 25 to constitute a blade cushioning member. ing.

Similarly, the arm buffering member may be configured by a first arm buffering unit 144, a second arm buffering unit 145, and a third arm buffering unit 146. The first arm buffer portion 144 is a high temperature characteristic material. The second arm buffer portion 145 is a low-temperature characteristic material. The third arm buffering part 146 is a material having characteristics between the first arm buffering part 144 and the second arm buffering part 145. In this modification, the first arm buffering portion 144 and the second arm buffering portion 145 are continuously arranged side by side, and the third blade buffering portion 143 is overlapped in the moving direction of the first front curtain arm 23 so that the arm buffering member is It is configured.
Thus, by providing three types of buffer portions having different rebound resilience, it becomes possible to adjust the resilience resilience in accordance with the FP shutter 130, and the application can be expanded. Moreover, it is also possible to provide three or more types of buffer portions having different rebound resilience rates.

[Fifth Embodiment]
FIG. 14 is a plan view showing a state in which the buffer member 153 is provided at the end portion 37a downstream of the guide groove 37 in the retracting direction.
As shown in FIG. 14, the FP shutter 150 includes a lever cushioning member 153 at an end portion 37 a downstream of the guide groove 37 in the retracting direction.
The lever cushioning member 153 includes a first lever cushioning portion 154 and a second lever cushioning portion 155. The first lever buffer portion 154 is made of a high-temperature characteristic material and is formed in a curved shape when viewed from the front. The second lever buffer 155 is made of a low-temperature characteristic material and is formed in a curved shape when viewed from the front. The first lever buffer portion 154 and the second lever buffer portion 155 are provided along the end portion 37 a of the guide groove 37.

  Here, as a result of the exposure operation, the leading blade connecting pin 35 moves downstream in the retracting direction as indicated by arrow B, whereby the leading blade 25 is returned to the retracting position H2 as indicated by arrow A shown in FIG. The front curtain connecting pin 35 contacts the lever buffer member 153 by moving to the downstream side in the retracting direction. The hardness of the first lever buffering portion 154 and the second lever buffering portion 155 can be adjusted so that the front curtain connecting pin 35 is easily brought into contact with both the first lever buffering portion 154 and the second lever buffering portion 155. . Therefore, when the front curtain connecting pin 35 comes into contact with the lever cushioning member 153, the lever cushioning member 153 can secure a more stable shock absorbing capability regardless of the environmental temperature.

The technical scope of the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the opening 15 is formed in the substrate 10 has been described, but the configuration is not limited thereto. The opening 15 may be provided in a member different from the substrate 10.
In the above-described embodiment, the buffer members 13, 113, 123, and 133 that contact when the leading blade 25 moves to the retracted position have been described, but the configuration is not limited thereto. For example, the present invention can be applied to a buffer member that abuts when the leading blade 25 moves to the deployed position. Further, the front curtain blade 25 can be applied to the buffer member in both the retracted position and the deployed position.
In the embodiment described above, the example in which the buffer member is applied to the leading blade 25 has been described, but the configuration is not limited thereto. For example, a buffer member can be applied to the trailing blade 55.
In the above-described embodiment, the example in which the buffer members 13, 113, 123, 133, and 153 are applied to the FP shutter 2 has been described, but the configuration is not limited thereto. For example, the buffer member can be applied to a lens shutter or the like.
In the above-described embodiment, the digital camera having the image sensor 4 has been described, but the present invention can also be applied to a blade driving device and an optical apparatus that use a film.

  Although the buffer member in 1st Embodiment-4th Embodiment showed the example comprised with an arm buffer member and a blade | wing buffer member, it should just be comprised by either one.

  The buffer member in the first to fourth embodiments is an example in which the length dimension of the blade cushioning member that contacts the leading blade 25 is larger than the length of the arm cushioning member that contacts the first leading arm 23. Although explained, it is not limited to this. The length dimension of the blade cushioning member and the length dimension of the arm cushioning member 71 may be the same. The shapes of the arm cushioning member and the blade cushioning member may be the same or different.

According to this configuration, by making the length of the blade cushioning member the same as the length of the arm cushioning member, the arm cushioning member and the blade cushioning member can be shared, and the product cost of the FP shutter is reduced. can do.

  Although the buffer member in the first to fourth embodiments has been described with respect to the example in which the thickness of the arm cushion member and the blade cushion member in the moving direction of the leading blade mechanism 11 is the same, Not exclusively. The thickness dimension of the blade cushioning member may be larger than the thickness dimension of the arm cushioning member. Here, the thickness dimension of the arm cushioning member refers to the thickness dimension viewed from the moving direction of the first front curtain arm 23. The thickness dimension of the blade cushioning member refers to the thickness dimension viewed from the moving direction of the leading blade 25.

  When the front curtain blade mechanism 11 returns to the retracted position by the exposure operation, the front curtain blade 25 side largely moves in the direction of the buffer member compared to the first front curtain arm 23 side due to the influence of inertia. Thus, by making the thickness of the blade cushioning member larger than the thickness of the arm cushioning member, the pressing force when the leading blade 25 contacts the blade cushioning member is absorbed well by the blade cushioning member. can do.

  In addition, in the range which does not deviate from the meaning of this invention, it is possible to replace suitably the component in the embodiment mentioned above by a known component, and you may combine each modification mentioned above suitably.

DESCRIPTION OF SYMBOLS 1 ... Optical equipment 2,110,120,130 ... FP shutter (blade drive device)
3 ... Control unit 10 ... Substrate 11 ... Front curtain blade mechanism (blade mechanism)
13, 113, 123, 133 ... buffer member 15 ... opening 23 ... first front curtain arm (arm)
23b: Base end of first front curtain arm 23c: Front end of first front curtain arm 25 ... Front curtain blade (blade)
25f: Base end of the leading blade 25g: Tip of the leading blade 71, 114, 124, 134 ... Arm buffer member 72, 82, 115, 125, 135, 153 ... Blade buffer member 74, 136 ... First arm buffer portion (First buffer part)
75, 137 ... second arm buffer (second buffer)
77, 83, 138 ... 1st blade buffer part (1st buffer part)
78, 84, 139 ... 2nd blade buffer part (2nd buffer part)
153 ... Lever cushioning member

Claims (10)

A blade mechanism that is supported by the substrate and is movable along the opening surface of the opening, and moves between a retracted position retracted from the opening and a deployed position deployed so as to overlap at least a part of the opening. When,
A buffer member that suppresses the movement of the blade mechanism by contacting the blade mechanism at at least one of the retracted position and the deployed position;
The blade driving device according to claim 1, wherein the buffer member includes at least two first buffer parts and second buffer parts having different temperature characteristics of rebound resilience. The blade mechanism has a base end supported by the substrate,
2. The blade driving device according to claim 1, wherein the first buffer portion and the second buffer portion are arranged side by side in an extending direction from the base end to the tip end.   3. The blade driving device according to claim 2, wherein the first buffer portion and the second buffer portion are continuously arranged in the extending direction.   3. The blade driving device according to claim 2, wherein the first buffer portion and the second buffer portion are arranged at intervals in the extending direction. The blade mechanism has a base end supported by the substrate,
The buffer part with low hardness is arrange | positioned at the front-end | tip on the opposite side to the said base end among the said 1st buffer part and the said 2nd buffer part, The any one of Claim 1 to 4 characterized by the above-mentioned. Blade drive device.   2. The blade driving device according to claim 1, wherein the first buffer portion and the second buffer portion are configured to overlap in a moving direction of the blade mechanism. The blade mechanism is
An arm supported swingably on the substrate;
A blade supported by the arm and moving between the retracted position and the deployed position;
The buffer member is configured to be able to contact both the arm and the blade,
The length dimension of the part contact | abutted to the said blade | wing among the said buffer members is set larger than the length dimension of the part contact | abutted to the said arm, The any one of Claim 1 to 6 characterized by the above-mentioned. The blade drive device described. The blade mechanism is
An arm supported swingably on the substrate;
A blade supported by the arm and moving between the retracted position and the deployed position;
The buffer member is configured to be able to contact both the arm and the blade,
Of the buffer member, the thickness dimension in the moving direction of the blade is set larger than the thickness dimension in the moving direction of the arm in the portion contacting the arm. The blade drive device according to any one of claims 1 to 7.   An optical apparatus comprising the blade driving device according to any one of claims 1 to 8. A blade mechanism that is supported by the substrate and is movable along the opening surface of the opening and moves between a retracted position retracted from the opening and a deployed position deployed so as to overlap at least a part of the opening; An optical device that controls a blade driving device having a buffer member that suppresses movement of the blade mechanism by abutting against the blade mechanism in at least one of the retracted position and the deployed position,
An optical apparatus comprising: a control unit that causes the blade mechanism to come into contact with the buffer member constituted by at least two first buffer units and second buffer units having different temperature characteristics of rebound resilience.

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