JP6566263B2 - Blade driving device and optical apparatus - Google Patents

Description

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

  As a blade drive device, for example, there is a focal plane shutter employed in an optical device such as a digital camera or a still camera. The focal plane shutter includes a substrate having an opening, an arm that is swingably supported by the substrate, and a blade that is supported by the arm. Then, by driving the arm, the blade is moved between a retracted position where the blade is retracted so as to expose the opening and a closed position where the opening is closed.

Here, since the movement of the blade is performed instantaneously, in order to prevent the bounce that occurs when the blade is stopped or to reduce the impact, a technique of providing a buffer member that contacts the blade at the stop position of the blade Has been proposed.
Specifically, at the closed position of the blade, the cushioning member is arranged with a slight gap from the blade. The buffer member is formed over substantially the entire area of one side that contacts the buffer member of the blade.

JP 2006-221054 A

  However, as in the above-described prior art, the buffer member is formed over almost the entire area of one side that contacts the buffer member of the blade, and is disposed at a slight distance from the blade at the closed position of the blade. There was a possibility that the shock at the time of stopping the blade could not be sufficiently absorbed by the buffer member.

  Therefore, the present invention has been made in view of the above-described circumstances, and provides a blade driving device and an optical apparatus that can reliably prevent the bounce of the blades when stopped and can surely reduce the impact of the blades. It is.

  In order to solve the above-described problems, a blade driving device according to the present invention includes a substrate having an opening, an arm that is swingably supported by the substrate, and is supported by the arm so that the opening is exposed. And at least one of the retracted position and the closed position, the blade is disposed near the blade, and the blade is moved between the retracted position retracted to the closed position for closing at least a part of the opening. A blade cushioning member that brakes the movement of the blade by contacting the blade, and the blade cushioning member includes a first blade cushioning member disposed on the arm side in the longitudinal direction of the blade, and the arm side. A second blade cushioning member disposed on the tip side of the blade opposite to the first blade cushioning member in a state where the first blade cushioning member and the blade are in contact with each other, Above They are spaced between the roots, characterized in that.

In this way, the blade cushioning member that brakes the movement of the blade is composed of at least two of the first blade cushioning member and the second blade cushioning member, and arranged on the arm side and the tip side of the blade, respectively. While it becomes easy to prevent the bounce of the blade | wing at the time of a stop, it can make it easy to relieve an impact.
Here, since the blade is supported by the arm and moves from the retracted position to the closed position by the arm, the moving amount on the tip side becomes larger than the moving amount on the arm side. In other words, the tip side of the blade swings more greatly than the arm side. For this reason, in a state where the first blade cushioning member and the blade are in contact with each other, the second blade cushioning member is disposed with a gap between the two blade cushioning members (first blade cushioning member). The second blade cushioning member) can absorb the impact of the blade in stages. Therefore, it is possible to reliably prevent the bounce of the blades at the time of stopping and to surely reduce the impact.

  In the blade driving device according to the present invention, the surface of the second blade cushioning member that is in contact with the blade is disposed so as to be separated from the blade as it moves from the arm side to the tip side of the blade. It is characterized by.

  Here, as described above, when the blade tip side swings more largely than the arm side, the blade tip side is more easily deformed than the blade arm side. That is, only the tip side may be inclined to move further due to the inertial force acting on the tip side of the blade from the time when the blade and the first blade cushioning member abut. For this reason, the surface which contacts the blade of the second blade cushioning member is arranged so as to be separated from the blade as the surface of the second blade cushioning member comes into contact with the blade from the arm side to the tip side of the blade. The surface of the blade that contacts the second blade cushioning member at the time when the blade contacts the second blade cushioning member can be made substantially parallel. As a result, the second blade cushioning member and the blade can be brought into surface contact as much as possible, and the impact applied to the blade can be minimized. Therefore, it is possible to reliably prevent the bounce of the blades at the time of stopping and to surely reduce the impact.

  In the blade driving device according to the present invention, at least one of the arm cushioning members is disposed in the vicinity of the arm at at least one of the retracted position and the closed position, and brakes the movement of the arm by contacting the arm. The hardness of the arm cushioning member is set higher than the hardness of the blade cushioning member.

In this way, by braking the arms and the blades using separate buffer members (blade buffer members and arm buffer members), it is possible to easily prevent the blades from bouncing at the time of stop and to ease the impact.
Here, since the blade is supported by the arm and is moved from the retracted position to the closed position by the arm, the moving amount of the blade is larger than the moving amount of the arm. For this reason, by setting the hardness of the arm cushioning member higher than the hardness of the blade cushioning member, the movement amount of the arm after the arm comes into contact with the arm cushioning member is suppressed as much as possible. It is easy to absorb. Therefore, it is possible to reliably prevent the bounce of the blades at the time of stopping and to surely reduce the impact.

  In the blade driving device according to the present invention, the blade is a front curtain and a rear curtain that can open and close the opening, and the arm includes a front curtain arm that drives the front curtain and a rear curtain that drives the rear curtain. The blade cushioning member is a front-curtain blade cushioning member and a rear-curtain blade cushioning member that respectively contact the front curtain and the rear curtain at the retracted position, and the arm cushioning member is at the retracted position. The front-curtain arm buffer member and the rear-curtain arm buffer member are in contact with the front-curtain arm and the rear-curtain arm, respectively.

  With this configuration, it is possible to reliably prevent the front curtain and the rear curtain from bouncing when stopped, and to reliably reduce the impact of the front curtain and the rear curtain.

  An optical apparatus according to the present invention includes the blade driving device described above.

  By configuring in this way, it is possible to provide an optical apparatus that can reliably prevent the bounce of the blades at the time of stopping and can reliably reduce the impact.

According to the present invention, the blade cushioning member that brakes the movement of the blade is composed of at least two of the first blade cushioning member and the second blade cushioning member, and is disposed on the arm side and the tip side of the blade, respectively. As a result, it is easy to prevent the bounce of the blades at the time of stopping and to ease the impact.
Moreover, in the state which the 1st blade | wing buffer member and the blade | wing contact | abutted in the state which the 2nd blade | wing buffer member contact | abutted, it arrange | positions at intervals, and two blade | wing buffer members (a 1st blade | wing buffer member, The impact of the blade can be absorbed step by step by the second blade cushioning member. For this reason, the bounce of the blade | wing at the time of a stop can be prevented reliably, and an impact can be relieved reliably.

It is a block diagram of the optical apparatus in the embodiment of the present invention. It is a front view of a focal plane shutter in a 1st embodiment of the present invention, and shows an initial state. It is a front view of a focal plane shutter in a 1st embodiment of the present invention, and shows an exposure end state. It is the front view which illustrated only the one part blade | wing of the focal plane shutter in 1st Embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is a perspective view for demonstrating the positional relationship of the front curtain and partition plate in 1st Embodiment of this invention. It is sectional drawing which follows the CC line of FIG. It is sectional drawing which follows the DD line | wire of FIG. It is explanatory drawing which shows the detailed arrangement | positioning of the front curtain buffer member in 1st Embodiment of this invention. It is explanatory drawing which shows the behavior just before the front curtain in 1st Embodiment of this invention completes the movement to a retracted position, Comprising: (a), (b) shows the behavior in the middle of operation | movement, respectively. It is a front view of the focal plane shutter in 1st Embodiment of this invention, Comprising: The middle of exposure is shown. It is a front view of the focal plane shutter in 1st Embodiment of this invention, Comprising: The middle of charge is shown. It is explanatory drawing which shows the detailed arrangement | positioning of the front curtain buffer member in 2nd Embodiment of this invention.

  Next, embodiments of the present invention will be described with reference to the drawings.

(Optical equipment)
FIG. 1 is a block diagram of the optical apparatus 1.
As shown in the figure, the optical apparatus 1 is, for example, a digital camera or a still camera, and includes a control unit 2, an image sensor 4, and a focal plane shutter 10.

  The control unit 2 controls the overall operation of the optical apparatus 1 and includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The control unit 2 controls the operation of the focal plane shutter 10 described later.

The imaging device 4 is, for example, a charge coupled device (CCD), a complementary metal oxide semiconductor (CMOS) image sensor, or the like, and converts a subject image formed by light into an electrical signal.
Although not shown in FIG. 1, the optical device 1 includes a lens for adjusting the focal length.

(First embodiment)
(Focal plane shutter)
Next, the focal plane shutter 10 will be described.
2 and 3 are front views of the focal plane shutter 10 and show a state where the blade receiving plate 15 is removed. FIG. 2 shows an initial state (charged state), and FIG. 3 shows a state immediately after the exposure is finished (exposure finished state). FIG. 4 is a front view of the focal plane shutter 10. FIG. 4 shows only some of the blades 31a and 31b for easy understanding.

  As shown in FIGS. 2 to 4, the focal plane shutter 10 is arranged between a base plate 11, a blade receiving plate 15 disposed to face the base plate 11, and the base plate 11 and the blade receiving plate 15. A partition plate (interval blade) 21, a front curtain 30A and front curtain arms 41a and 42a (a front curtain main arm 41a and a front curtain subarm 42a) disposed between the blade receiving plate 15 and the partition plate 21; The impact of the rear curtain 30B and the rear curtain arms 41b and 42b (the rear curtain main arm 41b and the rear curtain secondary arm 42b) disposed between the base plate 11 and the partition plate 21, and the front curtain 30A and the rear curtain 30B. And a buffer member 50 for relaxation.

  The base plate 11 is formed in a substantially rectangular shape by using, for example, a synthetic resin so as to be slightly longer in the first direction L1. A substantially rectangular first opening 12 that is slightly longer in the first direction L <b> 1 is formed in most of the center of the base plate 11. The base plate 11 is a member that is disposed closest to the lens of the optical device 1 among the members constituting the focal plane shutter 10.

The blade receiving plate 15 is disposed on the back surface of the base plate 11. The blade receiving plate 15 is formed in a substantially rectangular shape by using, for example, a synthetic resin or a metal material so as to be slightly longer in the first direction L1. A substantially rectangular second opening 16 that is slightly longer in the first direction L1 is formed in most of the center of the blade receiving plate 15.
The second opening 16 is formed at a position corresponding to the first opening 12 of the base plate 11. The second opening 16 is formed so as to substantially coincide with the first opening 12 in a front view. The blade receiving plate 15 is fastened and fixed to the base plate 11 with screws or the like, for example.

The partition plate 21 is disposed along the base plate 11 and the blade receiving plate 15. The partition plate 21 is formed to be slightly smaller than the base plate 11 and the blade receiving plate 15 in a plan view, for example, with synthetic resin. A rectangular third opening 22 that is slightly longer in the first direction L1 is formed in most of the center of the partition plate 21.
The third opening 22 is formed at a position corresponding to the first opening 12 of the base plate 11. The third opening 22 is formed so as to substantially coincide with the first opening 12 and the second opening 16 of the blade receiving plate 15 in a front view. The partition plate 21 is fixed to the base plate 11 at the outer peripheral portion thereof.

  Thus, the penetration direction of each of the openings 12, 16, and 22, that is, the direction in which the plates 11, 15, and 21 overlap each other is the optical axis direction L3 through which light passes. The plates 11, 15, and 21 are arranged in the order of the base plate 11, the partition plate 21, and the blade receiving plate 15 along the optical axis direction L3.

  The front curtain 30A and the rear curtain 30B reciprocate between a retracted position (open position) in which each of the openings 12, 16, and 22 is opened and a closed position in which the entire openings 12, 16, and 22 are closed. The openings 12, 16, and 22 can be opened and closed (see FIGS. 2 and 3).

  FIG. 2 shows a case where the front curtain 30A is in the closed position and the rear curtain 30B is in the retracted position. On the other hand, FIG. 3 shows a case where the front curtain 30A is in the retracted position and the rear curtain 30B is in the closed position. Here, the front curtain 30 </ b> A and the rear curtain 30 </ b> B are arranged at symmetrical positions with the openings 12, 16, 22 in between in the state where each is in the retracted position. That is, when the front curtain 30A and the rear curtain 30B are in the retracted positions, the openings 12, 16, and 22 are sandwiched between the openings 12, 16, and 22 in the short direction (second direction L2). It is provided so that it may be located in the side and the other side.

  As shown in detail in FIG. 2, the front curtain 30 </ b> A includes a plurality of (for example, four in the present embodiment) blades 31 a to 34 a. The front curtain 30A reciprocates between the retracted position and the closed position by moving the plurality of blades 31a to 34a along the second direction L2. The blades 31a to 34a are formed thin, for example, with a synthetic resin so as to be long in the first direction.

  The blades 31a to 34a are deployed at the closed position and stored while being overlapped at the retracted position. In the closed position, the blades 31a to 34a move in the moving direction (second direction L2) when the front curtain 30A moves from the retracted position to the closed position, from the upstream side to the downstream side (from the lower side to the upper side in FIG. 2) The blades 34a, 33a, 32a, 31a are arranged in this order.

  On the other hand, as shown in detail in FIG. 3, the rear curtain 30 </ b> B includes a plurality of (for example, four in the present embodiment) blades 31 b to 34 b. The rear curtain 30B also reciprocates between the retracted position and the closed position by moving the plurality of blades 31b to 34b along the second direction. The blades 31b to 34b are formed thin, for example, with a synthetic resin or the like so as to be long in the first direction.

  The blades 31b to 34b are deployed at the closed position and stored while being overlapped at the retracted position. The blades 31b to 34b are moved from the upstream side to the downstream side (from the upper side to the lower side in FIG. 3) when the rear curtain 30B moves from the retracted position to the closed position at the closed position. The blades 34b, 33b, 32b, 31b are arranged in this order.

  As shown in FIG. 2, the blades 31a to 34a constituting the front curtain 30A are connected to the front ends of the two front curtain arms 41a and 42a (the front curtain main arm 41a and the front curtain secondary arm 42a). More specifically, the blade 31a is rotatably connected to the distal end portions of the front curtain arms 41a and 42a at one end portion (base end portion) in the first direction L1. The blade 32a is rotatably connected to a portion closer to the base end than the portion of the front curtain arms 41a and 42a connected to the blade 31a at one end portion in the first direction L1.

The blade 33a is rotatably connected to a portion closer to the base end side than a portion of the front curtain arms 41a, 42a connected to the blade 32a at one end portion in the first direction L1. The blade 34a is rotatably connected to a portion closer to the base end side than a portion of the front curtain arms 41a and 42a connected to the blade 33a at one end portion in the first direction L1.
In this way, the blades 31a to 34a function as a parallel link mechanism together with the leading curtain arms 41a and 42a. The front curtain arms 41a and 42a are each formed of, for example, a metal thin plate in order to maintain strength.

  On the other hand, as shown in FIG. 3, the blades 31b to 34b constituting the rear curtain 30B are connected to the leading ends of the two rear curtain arms 41b and 42b (the rear curtain main arm 41b and the rear curtain secondary arm 42b). . More specifically, the blade 31b is rotatably connected to the tip of the rear curtain arms 41b and 42b at one end in the first direction L1. The blade 32b is rotatably connected to a portion closer to the base end side than a connection portion of the rear curtain arms 41b and 42b with the blade 31b at one end portion in the first direction L1.

The blade 33b is rotatably connected to a portion closer to the base end side than a connection portion of the rear curtain arms 41b and 42b with the blade 32b at one end portion in the first direction L1. The blade 34b is rotatably connected to a portion closer to the base end side than a connection portion of the rear curtain arms 41b and 42b with the blade 33b at one end portion in the first direction L1.
In this way, the blades 31b to 34b function as a parallel link mechanism together with the rear curtain arms 41b and 42b. The shapes of the rear curtain arms 41b and 42b are substantially symmetrical with respect to the front curtain arms 41a and 42a and the openings 12, 16, and 22, respectively. Further, the rear curtain arms 41b and 42b are formed of, for example, a thin metal plate in order to maintain the strength, similarly to the front curtain arms 41a and 42a.

FIG. 5 is a cross-sectional view taken along line AA in FIG.
As shown in FIGS. 4 and 5, the base ends 411a and 421a side of the front curtain arms 41a and 42a are rotatably supported by pins 61a and 62a standing on the base plate 11, respectively. The pins 61a and 62a protrude from the base plate 11 to the blade receiving plate 15 and are arranged side by side in the second direction L2. On the surface of the blade receiving plate 15 on the base plate 11 side (partition plate 21 side), seat surfaces 63a and 64a (main seat surface 63a and follower seat surface 64a) protrude from positions corresponding to the pins 61a and 62a, respectively. Has been.

  The seating surfaces 63a and 64a are formed with insertion holes 65a and 66a through which the pins 61a and 62a can be inserted, respectively. By inserting the tips of the pins 61a and 62a into the insertion holes 65a and 66a, the tips of the pins 61a and 62a are held by the blade receiving plate 15. Further, the base ends 411a and 421a of the front curtain arms 41a and 42a are slidably contacted with the seat surfaces 63a and 64a, respectively.

  Here, of the two seating surfaces 63a and 64a, the height of the trailing seat surface 64a to which the leading curtain slave arm 42a is slidably contacted is higher than the protruding height H1 of the main seating surface 63a to which the leading shutter main arm 41a is slidably contacting. The protrusion height H2 is set high. The change in the posture of the front curtain 30A due to the difference in the protruding heights H1 and H2 of the two seating surfaces 63a and 64a will be described in detail below.

6 is a cross-sectional view taken along line BB in FIG. 4, and FIG. 7 is a perspective view for explaining the positional relationship between the front curtain 30A and the partition plate 21. As shown in FIG.
As shown in FIGS. 6 and 7, when the protrusion height H2 of the secondary seat surface 64a is set higher than the protrusion height H1 of the main seat surface 63a, it is more than the base end 411a side of the leading curtain main arm 41a. The base end 421a side of the front curtain slave arm 42a is pushed out to the partition plate 21 side (see arrow Y1 in FIG. 7).

  Here, the front curtain arms 41 a and 42 a are disposed between the blade receiving plate 15 and the partition plate 21. Further, since the front curtain arms 41a and 42a constitute a parallel link mechanism in cooperation with the plurality of blades 31a to 34a, the base end 421a side of the front curtain secondary arm 42a is pushed out to the partition plate 21 side. As a result, the front end side of the front curtain slave arm 42a is pushed out in a direction away from the partition plate 21 (see arrow Y2 in FIG. 7). As a result, as shown in detail in FIG. 6, one side 311a in the moving direction (second direction L2) downstream (upper side in FIG. 6) when moving from the retracted position of the blade 31a to the closed position is upstream (FIG. 6). It is inclined so as to be farther from the partition plate 21 than one side 312a.

FIG. 8 is a cross-sectional view taken along the line CC of FIG.
As shown in FIGS. 4 and 8, the base ends 411 b and 421 b of the rear curtain arms 41 b and 42 b are rotatably supported by pins 61 b and 62 b erected on the base plate 11, respectively. The pins 61b and 62b protrude from the base plate 11 to the blade receiving plate 15 and are arranged side by side in the second direction L2. The blade receiving plate 15 is formed with insertion holes 65b and 66b through which the pins 61b and 62b can be inserted, respectively. By inserting the tips of the pins 61b and 62b into the insertion holes 65b and 66b, the tips of the pins 61b and 62b are held by the blade receiving plate 15.

  In addition, on the base plate 11, seat surfaces 63b and 64b (main seat surface 63b and follower seat surface 64b) are integrally formed coaxially with the pins 61b and 62b on the base sides of the pins 61b and 62b, respectively. . The base ends 411b and 421b of the rear curtain arms 41b and 42b are brought into sliding contact with the seat surfaces 63b and 64b, respectively.

Here, of the two seating surfaces 63b and 64b, the height of the projecting height H3 of the main seating surface 63b to which the rear curtain main arm 41b is slidably contacted is smaller than that of the seating surface 64b to which the rear curtain subarm 42b is slidably contacted. The protrusion height H4 is set high. The change in the posture of the trailing curtain 30B due to the difference in the protruding heights H3 and H4 of the two seating surfaces 63b and 64b will be described in detail below.
If the protrusion height H4 of the secondary seat surface 64b is set higher than the protrusion height H3 of the main seat surface 63b, the base end 421b side of the rear curtain secondary arm 42b is closer to the base end 411b side of the rear curtain main arm 41b. Extruded to the partition plate 21 side.

FIG. 9 is a cross-sectional view taken along the line DD in FIG.
As shown in FIGS. 4 and 9, the rear curtain arms 41 b and 42 b are disposed between the base plate 11 and the partition plate 21. Since the rear curtain arms 41b and 42b form a parallel link mechanism in cooperation with the plurality of blades 31b to 34b, the base end 421b side of the rear curtain follower arm 42b is pushed to the partition plate 21 side, The leading end side of the rear curtain follower arm 42b is pushed out in a direction away from the partition plate 21. As a result, one side 311b in the movement direction (second direction L2) downstream side (lower side in FIGS. 4 and 9) when the blade 31b moves from the retracted position to the closed position is upstream (upper side in FIGS. 4 and 9). ) Tilts away from the partition plate 21 rather than one side 312b.

  2 and 3, the base plate 11 has a front curtain drive lever (not shown) for driving the front curtain main arm 41a and a rear curtain main arm 41b (not shown) for driving the rear curtain main arm 41b. And a rear curtain drive lever. The front curtain drive lever and the rear curtain drive lever are each supported by the base plate 11 so as to be able to swing within a predetermined range. The front curtain drive lever and the rear curtain drive lever are provided with a front curtain drive pin and a rear curtain drive pin, respectively. The front curtain drive pin and the rear curtain drive pin are engaged with a front curtain drive hole 45A formed in the front curtain main arm 41a and a rear curtain drive hole 45B formed in the rear curtain main arm 41b, respectively.

More specifically, the front curtain drive lever is supported so as to be swingable about an axis formed on the base plate 11, and the front curtain drive pin is inserted into a guide groove 46 </ b> A formed on the base plate 11. Therefore, the swing range is defined. On the other hand, the rear curtain drive lever is supported so as to be swingable about an axis formed on the base plate 11, and the rear curtain drive pin is inserted into a guide groove 46 </ b> B formed on the base plate 11. Defines the swing range.
Then, when the front curtain drive lever configured as described above swings, the front curtain main arm 41a swings, and thereby the front curtain 30A moves. Similarly, when the rear curtain drive lever swings, the rear curtain main arm 41b swings, and thereby the rear curtain 30B moves.

  Each of the front curtain drive lever and the rear curtain drive lever is swung by a drive source (not shown). As the drive source, for example, one that drives each drive lever by the action of an electromagnet and an urging member such as a spring, or an electromagnetic actuator that includes a rotor, a stator, and a coil can be used.

  The buffer member 50 is formed of an elastic member such as nitrile rubber or urethane foam. The buffer member 50 includes a front curtain buffer member 50A and a rear curtain buffer member 50B, and is disposed between the base plate 11 and the blade receiving plate 15 and outside the partition plate 21, respectively. More detailed description will be given below. In the following description, the direction in which each curtain 30A, 30B moves from the closed position to the retracted position will be referred to as the retracted direction.

  The front curtain cushioning member 50A includes a first arm cushioning member 51a and a second arm cushioning that are in contact with the downstream side (lower side in FIGS. 2 and 3) of the front curtain main arm 41a in the retracted position of the front curtain 30A. The member 52a (front curtain arm cushioning member), the first blade cushioning member 53a that contacts the downstream side in the retracting direction of the blades 31a to 34a, and the second blade cushioning member 54a (front curtain blade cushioning member). Yes.

FIG. 10 is an explanatory view showing a detailed arrangement of the front curtain cushioning member 50A. In FIG. 10, only the blade 31 a is illustrated among the plurality of blades 31 a to 34 a, and the other blades 32 a to 34 a are not illustrated for easy understanding.
As shown in the figure, the first arm buffering member 51a and the second arm buffering member 52a are formed in a substantially rectangular parallelepiped shape. The first arm buffer member 51a and the second arm buffer member 52a are arranged side by side along the longitudinal direction of the leading curtain main arm 41a. The first arm buffering member 51a and the second arm buffering member 52a are such that one side in the short direction, which becomes the contact surfaces 511a and 521a with the leading curtain main arm 41a, is on the retracting direction side of the leading curtain main arm 41a. It arrange | positions along the one side 412a.

  On the other hand, the 1st blade | wing buffer member 53a and the 2nd blade | wing buffer member 54a are formed in the substantially rectangular parallelepiped shape so that it may become long in the longitudinal direction (1st direction L1) of the blade | wings 31a-34a. And the 1st blade | wing buffer member 53a is arrange | positioned so that the contact surface 531a with blade | wing 31a-34a may contact | abut to the front curtain main arm 41a side (base end side of blade | wing 31a-34a) of blade | wing 31a-34a. ing. In contrast, in the second blade cushioning member 54a, the contact surface 541a with the blades 31a to 34a contacts the opposite side of the front curtain main arm 41a of the blades 31a to 34a (the tip side of the blades 31a to 34a). Are arranged as follows.

  Here, the first arm cushioning member 51a, the second arm cushioning member 52a, and the first blade cushioning member 53a are respectively corresponding to the leading curtain main arm 41a and the blade at the retracted position of the leading curtain 30A (blades 31a to 34a). It arrange | positions so that it may contact | abut 31a-34a. In contrast, the second blade cushioning member 54a is in a state in which the first arm cushioning member 51a, the second arm cushioning member 52a, and the first blade cushioning member 53a are in contact with the leading curtain main arm 41a and the blades 31a to 34a. The blades 31a to 34a are disposed with a slight gap K1 therebetween.

  The interval K1 is set so as to increase in size as it moves from the leading curtain main arm 41a toward the tip side of the blades 31a to 34a. In other words, the second blade cushioning member 54a is configured so that the blades 31a to 34a move away from the blades 31a to 34a as the contact surface 541a moves from the leading curtain main arm 41a toward the tip side of the blades 31a to 34a. It is arranged obliquely with respect to one side in the retreat direction side. In addition, the inclination angle θ of the second blade cushioning member 54a with respect to one side of the blades 31a to 34a on the retracting direction side is set to about 2 °, for example.

  Returning to FIG. 2, the rear-curtain cushioning member 50 </ b> B is configured in a symmetrical position with the front-curtain cushioning member 50 </ b> A and the openings 12, 16, 22 interposed therebetween. That is, the rear-curtain cushioning member 50B includes the first arm cushioning member 51b and the second arm that abut on the downstream side (upper side in FIGS. 2 and 3) of the rear-curtain main arm 41b in the retracted position of the rear curtain 30B. It is comprised by the buffer member 52b (rear curtain arm buffer member), the 1st blade | wing buffer member 53b which contact | abuts the retraction | saving direction downstream of the blade | wings 31b-34b, and the 2nd blade buffer member 54b (rear curtain blade buffer member). ing.

  The first arm buffering member 51b and the second arm buffering member 52b are formed in a substantially rectangular parallelepiped shape. The first arm buffering member 51b and the second arm buffering member 52b are arranged side by side along the longitudinal direction of the rear curtain main arm 41b. The first arm buffering member 51b and the second arm buffering member 52b are configured such that one side in the short direction, which forms the contact surfaces 511b and 521b with the rear curtain main arm 41b, is on the retracting direction side of the rear curtain main arm 41b. It arrange | positions along the one side 412b.

  On the other hand, the 1st blade | wing buffer member 53b and the 2nd blade | wing buffer member 54b are formed in the substantially rectangular parallelepiped shape so that it may become long in the longitudinal direction (1st direction L1) of the blade | wings 31b-34b. The first blade cushioning member 53b is arranged such that the contact surface 531b with the blades 31b to 34b contacts the rear curtain main arm 41b side (the base end side of the blades 31b to 34b) of the blades 31b to 34b. ing. On the other hand, in the second blade cushioning member 54b, the contact surface 541b with the blades 31b to 34b contacts the opposite side of the rear curtain main arm 41b of the blades 31b to 34b (the tip side of the blades 31b to 34b). Are arranged as follows.

  Further, the second blade cushioning member 54b is configured so that the first arm cushioning member 51b, the second arm cushioning member 52b, and the first blade cushioning member 53b are in contact with the rear curtain main arm 41b and the blades 31b to 34b. It is arranged with a slight gap K2 between 31b and 34b. That is, in the second blade cushioning member 54b, the retracting direction of the blades 31b to 34b is such that the contact surface 541b moves away from the blades 31b to 34b as the contact surface 541b moves from the trailing curtain main arm 41b to the tip side of the blades 31b to 34b. It is arranged obliquely with respect to one side. In addition, the inclination angle of the second blade cushioning member 54b with respect to one side of the blades 31b to 34b in the retracting direction is also set to about 2 °, for example.

Next, the operation and action of the focal plane shutter 10 will be described.
As shown in FIG. 2, in the initial state of the focal plane shutter 10, the front curtain 30A is in the closed position and the rear curtain 30B is in the retracted position.
During shooting, when a release button (not shown) of the optical device 1 is pressed, the front curtain drive lever rotates. As a result, the front curtain 30A starts to move to the retracted position, and the openings 12, 16, and 22 are opened. On the other hand, since the rear curtain 30B is in the retracted position, the openings 12, 16, and 22 are maintained in an open state, light passes through the openings 12, 16, and 22 along the optical axis direction L3, and exposure is started. The

Here, based on FIG. 11, the behavior immediately before the leading curtain 30A completes the movement to the retracted position will be described.
FIG. 11A and FIG. 11B are explanatory diagrams showing the behavior immediately before the leading curtain 30A completes the movement to the retracted position. In FIG. 11, only the blade 31a is illustrated among the plurality of blades 31a to 34a, and the other blades 32a to 34a are not illustrated for easy understanding.

  As shown in FIG. 11A, when the front curtain 30A moves to the retracted position, the front curtain main arm 41a is brought into contact with the contact surface 511a of the first arm buffer member 51a and the contact surface 521a of the second arm buffer member 52a. One side 412a contacts. Further, the base end portions of the blades 31a to 34a are in contact with the contact surface 531a of the first blade cushioning member 53a. Thereby, the impact when the front curtain 30A moves to the retracted position is absorbed to some extent.

Here, the blades 31a to 34a are moved by the front curtain main arm 41a and the front curtain secondary arm 42a. The front curtain main arm 41a and the front curtain secondary arm 42a are respectively located on the base ends 411a and 421a side. It rotates around pins 61a and 62a (see FIG. 5) provided on the base plate 11. In other words, the rotation radius D of the front curtain 30A increases as the distance from the pins 61a and 62a increases, and the amount of movement increases.
In addition, an inertial force acts on the front curtain main arm 41a and the blades 31a to 34a even after the base end portions of the front curtain main arm 41a and the blades 31a to 34a come into contact with the buffer members 51a, 52a, and 53a. Furthermore, some assembling backlash occurs in each part, and some elastic deformation occurs. For this reason, the blades 31a to 34a continue to move.

As shown in FIG. 11B, when the blades 31a to 34a continue to move, the tip sides of the blades 31a to 34a come into contact with the contact surface 541a of the second blade buffer member 54a. Thereby, the impact of the blades 31a to 34a is reliably absorbed, and the inertia when the blades 31a to 34a move to the retracted position is effectively attenuated.
Moreover, in the second blade cushioning member 54a, the retracting direction of the blades 31a to 34a is such that the contact surface 541a moves away from the blades 31a to 34a as the contact surface 541a moves from the leading curtain main arm 41a toward the tip side of the blades 31a to 34a. It is arranged obliquely with respect to one side. For this reason, even if the blades 31a to 34a touch around the base end side, the blades 31a to 34a and the second blade cushioning member 54a are surely brought into surface contact. For this reason, the surface pressure of the blades 31a to 34a to the second blade cushioning member 54a is reduced, and wear of the second blade cushioning member 54a is reliably suppressed.

Subsequently, the trailing curtain drive lever rotates after a predetermined time has elapsed since the release button was pressed. As a result, the rear curtain 30B moves from the retracted position to the closed position, and the openings 12, 16, and 22 are closed. Then, the exposure is finished and one shooting is finished.
Here, when the rear curtain 30B moves from the retracted position to the closed position, the blade 31b exceeds the one side 22a (see FIG. 12) in the second direction L2 at the inner peripheral edge of the third opening 22 of the partition plate 21. become.

FIG. 12 is a front view of the focal plane shutter 10 and shows the middle of the rear curtain 30B moving from the retracted position to the closed position (during exposure).
As shown in the figure, the side 311b of the blade 31b faces the side 22a of the third opening 22 immediately before the trailing curtain 30B completes the movement to the closed position. Then, since the blade 31b goes beyond the one side 22a, the blade 31b may be caught on the one side 22a of the third opening 22. However, the rear curtain main arm 41b and the rear curtain slave arm 42b on which the blades 31b are supported differ in the support positions of the base ends 411b and 421b, respectively. For this reason, the blade 31 b is inclined such that one side 311 b is separated from the partition plate 21. As a result, the blade 31 b is prevented from being caught by the third opening 22 when the blade 31 b exceeds the side 22 a of the third opening 22.

  Next, a front-curtain drive lever and a rear-curtain drive lever are rotated in a direction opposite to that during the photographing operation by a set lever (not shown). As a result, the front curtain 30A is moved from the retracted position to the closed position, and the openings 12, 16, and 22 are closed. Further, the rear curtain 30B is housed in the retracted position, opens the openings 12, 16, and 22, and returns to the initial state shown in FIG.

  Here, when the front curtain 30A moves from the retracted position to the closed position, the same phenomenon occurs as when the rear curtain 30B moves from the retracted position to the closed position. That is, when the front curtain 30A moves from the retracted position to the closed position, the blade 31a exceeds the other side 22b (see FIG. 13) in the second direction L2 at the inner peripheral edge of the third opening 22 of the partition plate 21. become.

FIG. 13 is a front view of the focal plane shutter 10 and shows the middle of the front curtain 30A moving from the retracted position to the closed position (while charging).
As shown in the figure, immediately before the leading curtain 30A completes the movement to the closed position, one side 311a of the blade 31a faces the other side 22b of the third opening 22. The front curtain main arm 41a and the front curtain secondary arm 42a on which the blades 31a are supported differ in the support positions of the base ends 411a and 421a, respectively. For this reason, the blade 31 a is inclined such that one side 311 a is separated from the partition plate 21. As a result, when the blade 31a exceeds the other side 22b of the third opening 22, the blade 31a is prevented from being caught in the third opening 22.

Thus, in the first embodiment described above, the front curtain cushioning member 50A and the rear curtain cushioning member 50B that constitute the cushioning member 50 are the first arm cushioning members 51a and 51b and the second arm cushioning member 52a, respectively. 52b, first blade cushioning members 53a and 53b, and second blade cushioning members 54a and 54b. Among these, the first blade cushioning members 53a and 53b are disposed so as to contact the base end portions of the blades 31a to 34a at the retracted positions of the front curtain 30A and the rear curtain 30B. On the other hand, the second blade cushioning members 54a and 54b are slightly spaced K1 between the blades 31a to 34a and 31b to 34b when the first blade cushioning member 53a is in contact with the blades 31a to 34a and 31b to 34b. , K2 are arranged. For this reason, the impact of the blades 31a to 34a and 31b to 34b can be absorbed stepwise by the two blade cushioning members (the first blade cushioning members 53a and 53b and the second blade cushioning members 54a and 54b). Therefore, the bounce of the blades 31a to 34a and 31b to 34b at the time of stopping can be surely prevented and the impact can be surely mitigated.
Further, by providing the gaps K1 and K2, the second blade cushioning members 54a and 54b and the blades 31a to 34a first come into contact with each other due to manufacturing errors in each part, and an extra load is applied to the blades 31a to 34a. Can be prevented.

  Further, the second blade cushioning members 54a and 54b are configured such that the abutment surfaces 541a and 541b move from the leading blade main arm 41a and the trailing blade main arm 41b toward the leading ends of the blades 31a to 34a and 31b to 34b. The blades 31a to 34a and 31b to 34b are disposed obliquely with respect to one side in the retracting direction so as to be separated from .about.34a and 31b to 34b. For this reason, the blades 31a to 34a and 31b to 34b and the second blade cushioning members 54a and 54b are reliably brought into surface contact. Therefore, the impact of the blades 31a to 34a and 31b to 34b can be effectively absorbed by the second blade cushioning members 54a and 54b, and wear of the second blade cushioning member 54a can be reliably suppressed.

  Further, in the blade receiving plate 15, the protrusion height H2 of the follower surface 64a to which the front curtain slave arm 42a is slidably contacted is higher than the protrusion height H1 of the main seat surface 63a to which the front curtain main arm 41a is slidably contacted. It is set high. Further, in the base plate 11, the protrusion height H4 of the follower surface 64b slidably contacting the rear curtain slave arm 42b is higher than the protrusion height H3 of the main seat surface 63b slidably contacting the rear curtain main arm 41b. Is set. In other words, the base ends 421a and 421b of the slave arms 42a and 42b are supported more freely on the partition plate 21 side than the base ends 411a and 411b of the main arms 41a and 41b in the optical axis direction L3. It will be.

  For this reason, the front end side of each subarm 42a, 42b is displaced toward the direction away from the partition plate 21. As a result, the side 311a on the downstream side (the upper side in FIG. 6) in the movement direction (second direction L2) when the blade 31a constituting the front curtain 30A moves from the retracted position to the closed position is the upstream side (the lower side in FIG. 6). It tilts away from the partition plate 21 rather than the side 312a. Further, one side 311b in the moving direction (second direction L2) downstream side (lower side in FIG. 9) when moving from the retracted position to the closed position of the blade 31b constituting the rear curtain 30B is the upstream side (upper side in FIG. 9). ) Tilts away from the partition plate 21 rather than one side 312b.

  Thereby, when the front curtain 30A and the rear curtain 30B move from the retracted position to the closed position, it is possible to prevent the front curtain 30A and the rear curtain 30B from being caught on the inner peripheral edge of the third opening 22 of the partition plate 21. . Therefore, the malfunction of the blades 31a to 34a and 31b to 34b during the operation of the focal plane shutter 10 can be prevented, and damage to the blades 31a to 34a and 31b to 34b can be prevented.

  The focal plane shutter 10 includes a base plate 11, a blade receiving plate 15, and a partition plate 21, and a front curtain 30 </ b> A is disposed between the blade receiving plate 15 and the partition plate 21. A rear curtain 30 </ b> B is disposed between the partition plate 21 and the partition plate 21. Thus, the exposure time can be easily finely adjusted by opening and closing the two curtains 30A and 30B. For this reason, the performance of the optical apparatus 1 can be improved.

(Second Embodiment)
Next, a second embodiment of the present invention will be described based on FIG.
FIG. 14 is an explanatory view showing a detailed arrangement of the front curtain cushioning member 250A in the second embodiment and corresponds to FIG. 10 described above. In addition, the same code | symbol is attached | subjected to the aspect same as 1st Embodiment, and description is abbreviate | omitted.

As shown in the figure, the difference between the first embodiment and the second embodiment described above is that the second blade cushioning member 54a of the first embodiment is disposed and the second embodiment of the second embodiment. This is in the point where the blade cushioning member 254a is disposed.
That is, the second blade cushioning member 254a in the second embodiment has a contact surface 541a with the blades 31a to 34a (the blades 32a to 34a are not shown in FIG. 14) at the retracted position of the front curtain 30A. It arrange | positions so that it may contact | abut to the front end side of -34a.

  Here, in the second embodiment, the hardness of the first arm buffer member 251a and the second arm buffer member 252a is set higher than the hardness of the first blade buffer member 253a and the second blade buffer member 254a. . The hardness difference between the first blade buffer member 253a and the second blade buffer member 254a and the hardness difference between the first arm buffer member 251a and the second arm buffer member 252a is set to Hs20 or more, for example. This is because a manufacturing error of each of the buffer members 51a to 54a is taken into consideration. For example, when the hardness difference is set to Hs20 or more, the hardness of the first arm buffering member 51a and the second arm buffering member 52a is almost certainly higher than the hardness of the first blade buffering member 53a and the second blade buffering member 54a. Can be set high.

Below, each buffer member 251a to 254a for setting the hardness of the first arm buffer member 251a and the second arm buffer member 252a higher than the hardness of the first blade buffer member 253a and the second blade buffer member 254a. Examples of materials are listed.
That is,
1. The first arm buffering member 51a, the second arm buffering member 52a, the first blade buffering member 53a, and the second blade buffering member 54a are both formed of a rubber material. The hardness of the rubber material forming the first arm buffer member 51a and the second arm buffer member 52a is set higher than the hardness of the rubber material forming the first blade buffer member 53a and the second blade buffer member 54a. To do.

2. The first arm buffering member 51a and the second arm buffering member 52a are formed of a rubber material. On the other hand, the first blade cushioning member 53a and the second blade cushioning member 54a are formed of a urethane resin material.
3. The first arm buffering member 51a and the second arm buffering member 52a are formed of a rubber material. On the other hand, the first blade cushioning member 53a and the second blade cushioning member 54a are formed of a silicon-based resin material.

4). The first arm cushioning member 51a, the second arm cushioning member 52a, the first blade cushioning member 53a, and the second blade cushioning member 54a are both formed of a urethane resin material. Then, the urethane resin material forming the first arm buffer member 51a and the second arm buffer member 52a is made harder than the hardness of the urethane resin material forming the first blade buffer member 53a and the second blade buffer member 54a. Set the hardness high.
3. The first arm buffering member 51a, the second arm buffering member 52a, the first blade buffering member 53a, and the second blade buffering member 54a are both formed of a silicon-based resin material. Then, the silicon-based resin material forming the first arm buffer member 51a and the second arm buffer member 52a is made harder than the hardness of the silicon-based resin material forming the first blade buffer member 53a and the second blade buffer member 54a. Set the hardness high.

With this configuration, when the front curtain 30A moves to the retracted position, one side of the front curtain main arm 41a is brought into contact with the contact surface 511a of the first arm buffer member 251a and the contact surface 521a of the second arm buffer member 252a. 412a contacts. Further, the blades 31a to 34a are in contact with the contact surface 531a of the first blade cushioning member 253a and the contact surface 541a of the second blade cushioning member 254a. Thereby, the impact when the front curtain 30A moves to the retracted position is absorbed to some extent.
At this time, since the hardness of the first arm buffering member 251a and the second arm buffering member 252a is set high, the first arm buffering member 251a and the second arm buffering member 252a are in contact with each other. The movement of the leading curtain main arm 41a is suppressed.

On the other hand, the blades 31a to 34a having a large moving amount with respect to the leading curtain main arm 41a are subjected to a large inertia force even after coming into contact with the first blade buffer member 253a and the second blade buffer member 254a and try to move. To do. Since the hardness of the first blade cushioning member 253a and the second blade cushioning member 254a is set low, the impact of these blades 31a to 34a is effectively received while allowing the movement of the blades 31a to 34a to be attenuated. Absorbed.
Therefore, according to the second embodiment described above, the same effects as those of the front curtain cushioning member 50A and the rear curtain cushioning member 50B in the first embodiment are achieved.

Although illustration is omitted, the configurations of the first arm buffering member 51b, the second arm buffering member 52b, the first blade buffering member 53b, and the second blade buffering member 54b constituting the trailing curtain buffering member 50B are also as follows. The configurations of the first arm buffering member 251a, the second arm buffering member 252a, the first blade buffering member 253a, and the second blade buffering member 254a are the same.
In the following description, only the first arm buffer member 251a, the second arm buffer member 252a, the first blade buffer member 253a, and the second blade buffer member 254a constituting the front curtain buffer member 50A will be described. The same applies to the first arm buffering member 51b, the second arm buffering member 52b, the first blade buffering member 53b, and the second blade buffering member 54b constituting the curtain buffering member 50B.

  In the second embodiment described above, it is desirable to provide a resin plate or metal plate with high hardness on the contact surface 531a of the first blade cushioning member 253a and the contact surface 541a of the second blade cushioning member 254a. With this configuration, even when the hardness of the first blade cushioning member 253a and the second blade cushioning member 254a is set low, the wear of the first blade cushioning member 253a and the second blade cushioning member 254a is reduced. Can be suppressed.

  In the second embodiment described above, the lengths of the first blade cushioning member 253a and the second blade cushioning member 254a in the first direction L1 (see l1 in FIG. 14) are the same as the first arm cushioning member 251a and the first It is desirable to set the length longer than the length of the two-arm buffer member 252a. By comprising in this way, the contact area of the blade | wing 31a-34a which moves to a retracted position, the 1st blade | wing buffer member 253a, and the 2nd blade | wing buffer member 254a can be increased. As a result, the surface pressure when the blades 31a to 34a come into contact with the first blade buffer member 253a and the second blade buffer member 254a can be reduced, and damage to the blades 31a to 34a can be prevented.

  Furthermore, in the second embodiment described above, the thickness of the first blade cushioning member 253a and the second blade cushioning member 254a in the second direction L2 (see t1 in FIG. 14) is set to the first arm cushioning member 51b and the second It is desirable to set it thicker than the thickness of the two-arm buffer member 52b. With this configuration, even if the first blade cushioning member 253a and the second blade cushioning member 254a have low hardness, it is possible to sufficiently absorb the impact of the blades 31a to 34a.

(Modification)
The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention.
For example, in the above-described embodiment, the focal plane shutter 10 has the front curtain 30A and the rear curtain 30B, but is not limited thereto. For example, only the rear curtain 30B is provided as a focal plane shutter curtain, and the control section 2 has an electronic front curtain function that causes the imaging element 4 to perform the operation of the front curtain by electronically controlling the imaging element 4 by the control section 2 of the optical device 1. You may have it.

In the above-described embodiment, the front curtain 30A and the rear curtain 30B include four blades 31a to 34a and 31b to 34b, respectively. The blades 31a to 34a and 31b to 34b are the main arms 41a and 41b and the slave arms. The case where it connects with 42a, 42b was demonstrated. However, the present invention is not limited to this, and two or more slave arms may be provided for each of the curtains 30A and 30B. In this case, the base end side of the slave arm that is farthest from the main arms 41a and 41b can be rotated more freely on the partition plate 21 side than the base ends 411a and 411b side of the main arms 41a and 41b in the optical axis direction L3. It only has to be supported.
With this configuration, the postures of the blades 31a to 34a and 31b to 34b can be tilted. Therefore, it is possible to prevent the front curtain 30A and the rear curtain 30B from being caught on the inner peripheral edge of the third opening 22 of the partition plate 21 when the front curtain 30A and the rear curtain 30B move from the retracted position to the closed position, respectively.

  Furthermore, in the above-described embodiment, the first arm buffer members 51a, 51b, 251a and the second arm buffer members that are in contact with the downstream side in the retract direction of the leading curtain main arms 41a, 41b at the retracted positions of the curtains 30A, 30B. 52a, 52b, 252a, first blade cushioning members 53a, 53b, 253a and second blade cushioning members 54a, 54b, 254a that contact the downstream side of the blades 31a-34a, 31b-34b in the retracted direction are provided. Explained the case. However, the present invention is not limited to this, and a first blade cushioning member and a second blade cushioning member that contact the blades 31a and 31b may be provided at the closed positions of the curtains 30A and 30B. In this case, the first blade cushioning member and the second blade cushioning member are also arranged so as to correspond to the first blade cushioning members 53a, 53b, 253a and the second blade cushioning members 54a, 54b, 254a. By comprising in this way, the bounce of the blade | wings 31a and 31b in the obstruction | occlusion position of each curtain 30A, 30B can be prevented, and an impact can be relieved.

  In addition, for example, a buffer member 80 (indicated by a two-dot chain line in FIG. 2) that contacts the base end 411a of the front curtain main arm 41a may be provided at the closed position of the front curtain 30A. With this configuration, it is possible to reduce the impact when the front curtain 30A moves (deploys) from the retracted position to the closed position.

Furthermore, in the above-described embodiment, the case where the blades 31a to 34a and 31b to 34b are made of synthetic resin has been described. However, the present invention is not limited to this, and the blades 31a to 34a and 31b to 34b may be made of metal or a carbon fiber composite material.
The number of blades of each curtain 30A, 30B is not limited to four, but may be at least one.

  Furthermore, in the above-described second embodiment, the hardness of the first arm buffer member 251a and the second arm buffer member 252a is set higher than the hardness of the first blade buffer member 253a and the second blade buffer member 254a. An embodiment has been described. However, in the first embodiment, the first arm cushioning members 51a and 51b and the second arm cushioning members 52a and 52b are more rigid than the hardness of the first blade cushioning members 53a and 53b and the second blade cushioning members 54a and 54b. The hardness may be set high.

DESCRIPTION OF SYMBOLS 1 ... Optical apparatus 10 ... Focal plane shutter (blade drive device) 11 ... Base plate (board | substrate) 12 ... 1st opening (opening) 15 ... Blade | wing receiving plate (board | substrate) 16 ... 2nd opening (opening) 21 ... Partition plate ( Substrate) 22 ... 3rd opening (opening) 30A ... front curtain 30B ... rear curtain 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b ... blade 41a ... front curtain main arm (front curtain arm) 41b ... rear curtain Main arm (rear curtain arm) 42a ... front curtain secondary arm (front curtain arm) 42b ... rear curtain secondary arm (rear curtain arm) 51a, 251a ... first arm buffer member (arm buffer member, front curtain arm buffer member) 51b ... 1st arm buffer member (arm buffer member, rear curtain arm buffer member) 52a, 252a ... 2nd arm buffer member (arm buffer member, front curtain arm buffer member) 52b ... (Ar Buffer member, rear curtain arm buffer member) 53a, 253a ... 1st blade buffer member (blade buffer member, front curtain blade buffer member) 53b ... First blade buffer member (blade buffer member, rear curtain blade buffer member) 54a, 254a ... second blade cushioning member (blade cushioning member, leading curtain blade cushioning member) 54b ... second blade cushioning member (blade cushioning member, trailing curtain blade cushioning member) 531a, 531b, 541a, 541b ... contact surface (surface) K1 …interval

Claims (5)

A substrate having an opening;
An arm supported swingably on the substrate;
A vane that is supported by the arm and moves between a retracted position retracted so as to expose the opening and a closed position that closes at least a part of the opening;
A blade cushioning member disposed in the vicinity of the blade at at least one of the retracted position and the closed position, and braking the movement of the blade by contacting the blade;
With
The blade cushioning member includes, in the longitudinal direction of the blade, a first blade cushioning member disposed on the arm side, and a second blade cushioning member disposed on a tip side of the blade opposite to the arm side. Have
The second blade cushioning member is disposed with a gap between the first blade cushioning member and the blade in a state where the first blade cushioning member and the blade are in contact with each other.
A blade drive device characterized by that. The surface of the second blade cushioning member that comes into contact with the blade is disposed so as to be separated from the blade as it moves from the arm side to the tip side of the blade.
The blade driving device according to claim 1. At least one of the retracted position and the closed position, and is provided in the vicinity of the arm, and includes at least one arm cushioning member that brakes movement of the arm by contacting the arm,
The hardness of the arm cushioning member is set higher than the hardness of the blade cushioning member,
The blade driving device according to claim 1, wherein the blade driving device is provided. The blades are a front curtain and a rear curtain that can open and close the opening,
The arm is a front curtain arm that drives the front curtain, and a rear curtain arm that drives the rear curtain,
The blade cushioning member is a front curtain blade cushioning member and a rear curtain blade cushioning member that respectively contact the front curtain and the rear curtain at the retracted position;
The arm cushioning member is a front curtain arm cushioning member and a rear curtain arm cushioning member that come into contact with the front curtain arm and the rear curtain arm, respectively, in the retracted position.
The blade driving device according to claim 3. The blade drive device according to any one of claims 1 to 4 is provided.
An optical apparatus characterized by that.

Images