JP6566244B2 - Focal plane shutter and optical equipment - Google Patents

Description

  The present invention relates to a focal plane shutter and an optical apparatus.

  For example, a focal plane shutter is employed in optical devices such as digital cameras and still cameras. The focal plane shutter includes a substrate having an opening, an arm that is swingably supported by the substrate, and a curtain that is connected to the arm and can open and close the opening. In such a focal plane shutter, the image sensor is exposed by moving the curtain so as to open and close the opening.

  By the way, the curtain moves at a high speed with respect to the substrate. For this reason, the focal plane shutter has a brake structure that applies a braking force to the curtain at the end of the movement range of the curtain. For example, the camera shutter described in Patent Document 1 has a brake structure that applies a braking force while moving in the moving direction of the curtain when the curtain moves to the end of the movement range of the curtain.

JP-A-9-197478

  By the way, recent optical devices are expected to further increase the speed in order to shorten the shooting interval during continuous shooting. For this reason, the focal plane shutter is required to increase the moving speed of the curtain. However, in order to increase the moving speed of the curtain, it is necessary to increase the braking force for properly stopping the curtain.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a focal plane shutter and an optical apparatus that can improve the braking force.

In order to solve the above problems, a focal plane shutter according to the present invention includes a substrate having an opening, an arm that is swingably supported by the substrate, a curtain that is connected to the arm and can open and close the opening, When the curtain moves to the end of the movement range of the curtain by swinging the predetermined range, at least one of the arm, the curtain, and the drive lever when the curtain moves to the end of the movement range of the curtain And the buffer member is supported with a gap between the buffer member and a positioning portion of the substrate for positioning the buffer member, and at least the arm, the curtain, and the drive lever are supported. When any one of them abuts against the buffer member, the curtain is deformed so as to bend in a direction substantially perpendicular to a plane including the moving direction of the curtain, and the curtain includes a front curtain and a rear curtain, The destination A front curtain arm coupled to the rear curtain and a rear curtain arm coupled to the rear curtain, wherein the drive lever includes a front curtain drive lever that drives the front curtain, and a rear curtain drive lever that drives the rear curtain. And the buffer member receives at least one of the front curtain, the front curtain arm, and the front curtain drive lever when the front curtain moves to the end of the movement range of the front curtain. When the front curtain buffer that contacts the rear curtain moves to the end of the movement range of the rear curtain, at least one of the rear curtain, the rear curtain arm, and the rear curtain drive lever comes into contact It is formed by one part including a curtain buffer part .

According to this configuration, when the curtain moves to the end of its movement range, at least a part of the buffer member is deformed so as to bend in a direction substantially perpendicular to the plane including the movement direction of the curtain, thereby Brake force is applied. Such a buffer member can be formed relatively large because there are fewer restrictions on the installation location than a brake structure that applies a braking force by being deformed in the moving direction of the curtain. For this reason, according to the said structure, the improvement of the braking force of a focal plane shutter can be aimed at. Further, according to the above configuration, when the front curtain moves to the end of the moving range, the front curtain buffer can apply a braking force to the front curtain. In addition, when the rear curtain moves to the end of its moving range, the rear curtain cushioning section can apply a braking force to the rear curtain. As a result, the braking force for both the front curtain and the rear curtain can be improved.

  Further, the buffer member as described above can be installed at a position different from the brake structure in which the braking force is applied by being deformed in the moving direction of the curtain. For this reason, the buffer member as described above can be additionally provided to an existing brake structure that applies a braking force by being deformed in the moving direction of the curtain. From this point of view, according to the above configuration, the braking force of the focal plane shutter can be improved.

Further, in a brake structure in which a braking force is applied by being deformed in the movement direction of the curtain, if the braking force is increased, the brake structure is enlarged in the movement direction of the curtain. When the brake structure is enlarged in the moving direction of the curtain, the focal plane shutter is enlarged.
On the other hand, when a buffer member that is deformed so as to bend in a direction substantially orthogonal to the plane including the moving direction of the curtain is used, the buffer member can be arranged without increasing the size of the brake structure in the moving direction of the curtain. According to such a configuration, it is possible to improve the braking force while avoiding an increase in the size of the focal plane shutter.

  The gap may be formed between the buffer member and the positioning portion in a direction in which at least one of the arm, the curtain, and the drive lever is in contact with the buffer member. .

  According to this configuration, when at least one of the arm, the curtain, and the drive lever comes into contact with the buffer member, the buffer member easily moves with respect to the positioning portion of the substrate. If the buffer member easily moves relative to the positioning portion of the substrate, the buffer member is greatly deformed and easily bent. If the buffer member can be greatly deformed and bent, the buffer member can apply a larger braking force. For this reason, according to the said structure, the braking force of a focal plane shutter can further be improved.

The shock-absorbing member includes a plate member that extends in the moving direction of the curtain and is provided with both the front-curtain shock-absorbing portion and the rear-curtain shock-absorbing portion.
According to this structure, the brake structure with respect to both a front curtain and a rear curtain is realizable by one buffer member. Such a configuration is advantageous for reducing the size and cost of the focal plane shutter.

In addition, the arm includes a base end portion supported by the substrate and a connecting portion connected to the curtain, and a portion between the base end portion and the connecting portion in the arm is the It contacts the buffer member.
According to this configuration, it is possible to realize a structure in which the arm and the buffer member come into contact with each other by using a portion between the base end portion and the connecting portion in the arm. That is, according to the above configuration, it is possible to realize a structure in which the arm and the buffer member abut without providing the arm with a special additional shape for abutting the buffer member. According to such a configuration, it is advantageous for downsizing the focal plane shutter, and the cost necessary for providing the buffer member can be reduced.

In addition, the buffer member includes a buffer portion with which at least one of the arm, the curtain, and the drive lever abuts, and the buffer portion is made of metal.
According to this configuration, at least one of the arm, the curtain, and the drive lever can be abutted by the metal buffer portion having a relatively high rigidity, thereby improving the durability and life of the focal plane shutter. be able to.

The optical apparatus of the present invention includes any one of the above-described focal plane shutters.
According to this configuration, it is possible to improve the braking force of the optical device. If the braking force of the optical device can be improved, the optical device can be further increased in speed.

  According to the present invention, it is possible to improve the braking force of the focal plane shutter and the optical device.

1 is a block diagram of an optical apparatus according to a first embodiment. The figure which shows the initial state of the focal plane shutter of 1st Embodiment. The figure which shows the state in the middle of exposure of the focal plane shutter of 1st Embodiment. The figure which shows the state immediately after the exposure of the focal plane shutter of 1st Embodiment is complete | finished. The perspective view which looked at the focal plane shutter shown in FIG. 4 from another angle. Sectional drawing which follows the F6-F6 line | wire of the focal plane shutter shown in FIG. The figure which shows the buffer member of 1st Embodiment typically. The figure which shows the buffer member of 1st Embodiment typically. The figure which shows typically the one modification of the buffer member of 1st Embodiment. The figure which shows the focal plane shutter of 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same reference numerals are given to configurations having the same or similar functions. And those overlapping descriptions may be omitted.

(First embodiment)
(Optical equipment)
FIG. 1 is a block diagram of the optical apparatus 1. The optical device 1 is a digital camera, a still camera, or the like. As shown in FIG. 1, the optical apparatus 1 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 device 1. The control unit 2 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 a CCD (Charge Coupled Device), a CMOS (Complementary Metal Oxide Semiconductor) image sensor, or the like. The image sensor 4 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.

(Focal plane shutter)
Next, the focal plane shutter 10 will be described.
FIG. 2 shows an initial state (charge state) of the focal plane shutter 10. FIG. 3 shows a state during exposure of the focal plane shutter 10. FIG. 4 shows a state immediately after the exposure of the focal plane shutter 10 is completed. FIG. 5 is a perspective view of the focal plane shutter 10 in the state of FIG. 4 as seen from another angle. FIG. 6 is a cross-sectional view taken along line F6-F6 of the focal plane shutter 10 shown in FIG.

  First, as shown in FIGS. 2 to 4, the focal plane shutter 10 includes a substrate 11, blades 21a to 23a, 21b to 23b, an arm 31, a drive lever 41, and electromagnets 51A and 51B.

  The substrate (base plate) 11 is made of, for example, a synthetic resin and has a rectangular opening 12. The substrate 11 is disposed closest to the lens of the optical device 1 among the members constituting the focal plane shutter 10. The substrate 11 is a component to which the arm 31, the drive lever 41, and the electromagnets 51A and 51B are attached and supports these members.

  A blade receiving plate (not shown) is attached to the substrate 11. The blade receiving plate is attached to the substrate 11 so as to accommodate the blades 21 a to 23 a, 21 b to 23 b, the arm 31, and the like between the blade receiving plate and the substrate 11. The blade receiving plate is made of, for example, a synthetic resin and has a rectangular opening. The opening of the blade receiving plate is formed so as to substantially coincide with the opening 12 of the substrate 11 in plan view.

  The blades 21a to 23a and 21b to 23b are made of synthetic resin, for example, and are formed relatively thin. Each of the blades 21 a to 23 a and 21 b to 23 b is movable between a position retracted from the opening 12 and a position overlapping at least a part of the opening 12. The blades 21 a to 23 a and 21 b to 23 b form a curtain 25 that opens and closes the opening 12. The blades 21a to 23a and 21b to 23b are opened to close the opening 12. On the other hand, the blades 21a to 23a and 21b to 23b are stored while being overlapped with each other, thereby opening the opening 12 (see FIGS. 2 to 4). In the following description, the state in which the blades 21a to 23a and 21b to 23b are deployed is referred to as “deployed state”. Moreover, the state in which the blades 21a to 23a and 21b to 23b are stored is referred to as “stored state”.

  More specifically, the curtain 25 includes a front curtain 25A and a rear curtain 25B. In the present embodiment, the three blades 21a to 23a constitute the front curtain 25A. The three blades 21b to 23b constitute a rear curtain 25B. FIG. 2 shows a case where the front curtain 25A is in the unfolded state and the rear curtain 25B is in the retracted state. FIG. 3 shows a case where both the front curtain 25A and the rear curtain 25B are stored. FIG. 4 shows a case where the front curtain 25A is in the retracted state and the rear curtain 25B is in the unfolded state.

  As shown in FIGS. 2 to 4, the front curtain 25 </ b> A is movable between a developed state in which the front curtain 25 </ b> A closes the opening 12 and a storage state in which the front curtain 25 </ b> A is retracted from the opening 12. That is, the front curtain 25A has a movement range that extends between the unfolded state and the stored state. The front curtain 25A is positioned at one end (for example, the start end) of the movement range of the front curtain 25A in the unfolded state (see FIG. 2). In addition, the front curtain 25A is located at the other end (for example, the end) of the movement range of the front curtain 25A in the retracted state (see FIG. 4).

  Similarly, the rear curtain 25B is movable between a developed state in which the rear curtain 25B closes the opening 12 and a retracted state in which the rear curtain 25B is retracted from the opening 12. That is, the rear curtain 25B has a movement range that extends between the deployed state and the stored state. The rear curtain 25B is located at one end (for example, the start end) of the movement range of the rear curtain 25B in the retracted state (see FIG. 2). In addition, the rear curtain 25B is positioned at the other end (for example, the end) of the movement range of the rear curtain 25B in the unfolded state (see FIG. 4).

Next, the arm 31 and the drive lever 41 that drive the front curtain 25A and the rear curtain 25B will be described.
As shown in FIGS. 2 to 4, the arm (arm mechanism) 31 is supported by the substrate 11 so as to be swingable. The arm 31 includes four drive arms 31a, 32a, 31b, and 32b. The two drive arms 31a and 32a are connected to the front curtain 25A. Each of the drive arms 31a and 32a is an example of a “front curtain arm”. The other two drive arms 31b and 32b are connected to the rear curtain 25B. Each of the drive arms 31b and 32b is an example of a “rear curtain arm”.

  More specifically, drive arms 31a and 32a are rotatably connected to one blade 21a included in the front curtain 25A. The blades 21a and the drive arms 31a and 32a form a parallel link mechanism. Similarly to the blade 21a, the drive arms 31a and 32a are rotatably connected to another blade 22a included in the front curtain 25A. The drive arms 31a and 32a are connected to the other blades 23a with the same structure as the blades 21a and 22a. The connection between the rear curtain 25B and the drive arms 31b and 32b is the same as the connection between the front curtain 25A and the drive arms 31a and 32a. Each of the drive arms 31a, 32a, 31b, and 32b is supported by the substrate 11 so as to be swingable. The drive arms 31a, 32a, 31b, and 32b are made of, for example, metal.

  As shown in FIG. 5, the substrate 11 has four support shafts 14a, 14b, 15a, 15b. The four support shafts 14a, 14b, 15a, 15b extend in a direction substantially orthogonal to a plane including the moving direction of the curtain 25.

  One support shaft 14a rotatably supports the drive arm 31a. Another support shaft 15a rotatably supports the drive arm 32a. That is, the support shafts 14a and 15a serve as pivot shafts for the two drive arms 31a and 32a that drive the front curtain 25A. Similarly, one support shaft 14b supports the drive arm 31b so as to be rotatable. Another support shaft 15b rotatably supports the drive arm 32b. That is, the support shafts 14b and 15b serve as pivot shafts for the two drive arms 31b and 32b that drive the rear curtain 25B.

  The drive lever (drive lever mechanism) 41 is provided on the substrate 11. The drive lever 41 includes a front curtain drive lever 41A that drives the front curtain 25A and a rear curtain drive lever 41B that drives the rear curtain 25B. The front-curtain drive lever 41A and the rear-curtain drive lever 41B are each supported by the substrate 11 so as to be able to swing within a predetermined range. For example, the front curtain drive lever 41 </ b> A is supported so as to be swingable about an axis provided on the substrate 11, and the swing range is defined by a groove formed in the substrate 11. The same applies to the trailing curtain drive lever 41B.

  The front curtain drive lever 41A is connected to the drive arm 31a. The front curtain drive lever 41A swings the predetermined range to drive the drive arm 31a. The front curtain drive lever 41A drives the drive arm 31a to drive the front curtain 25A between the deployed state and the stored state. Similarly, the rear curtain drive lever 41B is connected to the drive arm 31b. The rear curtain drive lever 41B swings the predetermined range to drive the drive arm 31b. The rear curtain drive lever 41B drives the drive arm 31b to drive the rear curtain 25B between the deployed state and the stored state.

  Each of the front curtain drive lever 41A and the rear curtain drive lever 41B holds an iron piece. The front curtain drive lever 41A can swing between a position where the iron piece abuts on the electromagnet 51A (see FIG. 2) and a position where the iron piece is separated from the electromagnet 51A. The same applies to the trailing curtain drive lever 41B.

  The front curtain drive lever 41A is biased in a direction away from the electromagnet 51A by the spring 61A. Similarly, the rear curtain drive lever 41B is urged in a direction away from the electromagnet 51B by the spring 61B. When the electromagnet 51A is energized, the iron piece of the front curtain drive lever 41A can be attracted. Similarly, when the electromagnet 51B is energized, the iron piece of the trailing curtain drive lever 41B can be attracted.

Next, the first to third buffer members 71, 72, 73 will be described.
As shown in FIG. 2, the focal plane shutter 10 includes first to third buffer members 71, 72, 73. The first and second buffer members 71 and 72 are deformed in the moving direction of the front curtain 25A and the rear curtain 25B, thereby generating a braking force for the front curtain 25A or the rear curtain 25B. On the other hand, the third buffer member 73 is deformed so as to bend in a direction substantially perpendicular to the plane including the moving direction of the front curtain 25A and the rear curtain 25B, thereby generating a braking force on the front curtain 25A and the rear curtain 25B. .

  Here, the X direction, the Y direction, and the Z direction are defined. As shown in FIG. 2, the X direction and the Y direction are substantially parallel to a plane including the moving direction of the front curtain 25A and the rear curtain 25B. The X direction is a direction substantially parallel to the moving direction of the front curtain 25A and the rear curtain 25B. The Y direction is a direction that intersects (for example, substantially orthogonal) to the X direction, and is a direction from the drive arms 31a, 32a, 31b, and 32b toward the blades 21a to 23a and 21b to 23b. The Z direction (see FIG. 5) is a direction substantially orthogonal to the plane including the moving direction of the front curtain 25A and the rear curtain 25B. The Z direction is the thickness direction of the blades 21 a to 23 a and 21 b to 23 b and is the optical axis direction of light passing through the opening 12.

Further, four end portions 11a, 11b, 11c, and 11d of the substrate 11 are defined. As shown in FIG. 2, the substrate 11 has four end portions 11a, 11b, 11c, and 11d in a plan view. The first end portion 11a and the second end portion 11b are end portions extending in the X direction, respectively. The first end portion 11a is an end portion closer to the support shafts 14a, 14b, 15a, and 15b that support the drive arms 31a, 31b, 32a, and 32b than the second end portion 11b. The support shafts 14a, 14b, 15a, 15b are arranged along the first end portion 11a.
On the other hand, the third end portion 11c and the fourth end portion 11d are end portions extending in the Y direction, respectively. The third end portion 11c is located in the vicinity of the front curtain 25A in the housed state. On the other hand, the fourth end portion 11d is located in the vicinity of the rear curtain 25B in the stored state.

  As shown in FIG. 4, the first buffer member 71 is provided at the third end portion 11 c of the substrate 11. When the front curtain 25A moves to the end of the movement range of the first buffer member 71, the drive arm 31a connected to the front curtain 25A abuts. The first buffer member 71 generates a braking force for the front curtain 25A when the drive arm 31a comes into contact therewith.

  Specifically, the first buffer member 71 includes an elastic member 71a and a cover 71b. The elastic member 71a is formed of sponge-like synthetic resin or rubber. The elastic member 71a is elastically deformed in the X direction when the drive arm 31a contacts the first buffer member 71. Since the elastic member 71a is elastically deformed, the bounce of the front curtain 25A is suppressed. The cover 71b is made of metal or plastic. The cover 71b is provided between the drive arm 31a and the elastic member 71a. The drive arm 31a contacts the cover 71b.

  Similarly, the second buffer member 72 is provided at the fourth end portion 11d of the substrate 11 as shown in FIG. The second buffer member 72 comes into contact with the drive arm 31b connected to the rear curtain 25B when the rear curtain 25B returns to the start end of its movement range. The second buffer member 72 generates a braking force for the rear curtain 25B when the drive arm 31b comes into contact therewith.

  Specifically, the second buffer member 72 includes an elastic member 72a and a cover 72b. The elastic member 72a is formed of sponge-like synthetic resin or rubber. The elastic member 72a is elastically deformed in the direction opposite to the X direction when the drive arm 31b contacts the second buffer member 72. Since the elastic member 72a is elastically deformed, the bounce of the rear curtain 25B is suppressed. The cover 72b is made of metal or plastic. The cover 72b is provided between the drive arm 31b and the elastic member 72a. The drive arm 31b contacts the cover 72b.

Next, the third buffer member 73 will be described.
The third buffer member 73 is an example of the “buffer member” in the present application. When the front curtain 25A moves to the end of its moving range, the third buffer member 73 abuts the drive arm 32a connected to the front curtain 25A. The third buffer member 73 generates a braking force for the front curtain 25A when the drive arm 32a comes into contact therewith. Further, when the rear curtain 25B moves to the end of the moving range, the third buffer member 73 comes into contact with the drive arm 31b connected to the rear curtain 25B. The third buffer member 73 generates a braking force for the rear curtain 25B when the drive arm 31b comes into contact therewith.

  More specifically, as shown in FIG. 5, the third buffer member 73 includes a plate member 80, a front curtain buffer portion 81, and a rear curtain buffer portion 82.

  The plate member (brake plate) 80 is, for example, a flat plate made of metal or plastic. The plate member 80 has elasticity that can be bent in the thickness direction (Z direction) of the plate member 80. As shown in FIG. 5, the plate member 80 is disposed in the vicinity of the support shafts 14 a, 14 b, 15 a, 15 b of the substrate 11. The plate member 80 extends in the X direction. More specifically, the plate member 80 is disposed between the blades 21a to 23a and 21b to 23b and the first end portion 11a of the substrate 11 in the same manner as the support shafts 14a, 14b, 15a, and 15b. That is, the plate member 80 is arranged in the Y direction with respect to the blades 21a to 23a and 21b to 23b. At least a part of the plate member 80 overlaps the drive arms 31a, 32a, 31b, and 32b in the Z direction. In other words, at least a part of the plate member 80 overlaps in the Z direction with respect to the movement trajectory (movement path) of the drive arms 31a, 32a, 31b, and 32b.

  As shown in FIG. 6, the substrate 11 has a support surface 11s from which the support shafts 14a, 14b, 15a, and 15b protrude. The support surface 11s is a surface that extends substantially parallel to a plane including the moving direction of the front curtain 25A and the rear curtain 25B. The plate member 80 is disposed substantially parallel to the support surface 11s. For example, the plate member 80 is in contact with the support surface 11s. Instead of this, a gap may be provided between the plate member 80 and the support surface 11s.

  FIG. 7 schematically shows the shape of the plate member 80. As shown in FIG. 7, the plate member 80 has a first portion 80a, a second portion 80b, and a third portion 80c. The first portion 80a is provided in the vicinity of the support shaft 14a. The first portion 80a is provided with a first hole 84 through which the support shaft 14a of the substrate 11 is passed. The first hole 84 is a round hole corresponding to the outer diameter of the support shaft 14a. That is, the inner diameter of the first hole 84 is formed substantially the same as the outer diameter of the support shaft 14a. For this reason, when the support shaft 14a is passed through the first hole 84, the position of the plate member 80 is fixed with respect to the support shaft 14a. The support shaft 14a may be referred to as a “fixed portion” or a “first support portion”.

  On the other hand, the second portion 80b is provided in the vicinity of the support shaft 14b. The second portion 80b is provided with a second hole 85 through which the support shaft 14b of the substrate 11 is passed. When the support shaft 14b is passed through the second hole 85, the position of the plate member 80 with respect to the support shaft 14b is determined. The support shaft 14 b is an example of a “positioning portion” that positions the third buffer member 73. Further, the support shaft 14b may be referred to as a “second support portion”.

  As shown in FIG. 7, the second hole 85 is a long hole that is formed larger than the outer diameter of the support shaft 14b. The length L in the major axis direction of the second hole 85 is larger than the outer diameter of the support shaft 14b. Therefore, a gap S is formed between the inner peripheral surface 85a of the second hole 85 and the support shaft 14b. In other words, the plate member 80 is supported with a gap S between the plate member 80 and the support shaft 14 b of the substrate 11. For this reason, the second portion 80b is movable (can be displaced) with respect to the support shaft 14b. The gap S is a gap in a direction substantially parallel to the support surface 11 s of the substrate 11.

As shown in FIG. 7, the major axis direction of the second hole 85 is substantially parallel to, for example, a contact direction D in which the drive arm 31 b contacts a rear curtain buffer portion 82 (described later). In other words, the gap S between the inner peripheral surface 85a of the second hole 85 and the support shaft 14b extends substantially in parallel with the contact direction D in which the drive arm 31b contacts the rear curtain buffer portion 82. For this reason, the second portion 80b is movable with respect to the support shaft 14b in the abutting direction D in which the drive arm 31b abuts on the trailing curtain buffer portion 82.
On the other hand, the width W in the minor axis direction of the second hole 85 may be substantially the same as the outer diameter of the support shaft 14b or may be larger than the outer diameter of the support shaft 14b.

  From another viewpoint, as shown in FIG. 5, the plate member 80 includes two support shafts 14 a, 14 b, 15 a, and 15 b provided on the substrate 11 that are the farthest apart from each other. Positioned by 14a and 14b. The plate member 80 is positioned by the two support shafts 14a and 14b farthest among the four support shafts 14a, 14b, 15a and 15b, so that the plate member 80 is positioned by the other support shafts 15a and 15b. Thus, the accuracy with respect to positioning is increased.

  The third portion 80c is provided between the first portion 80a and the second portion 80b. The third portion 80c extends between the first portion 80a and the second portion 80b, and connects the first portion 80a and the second portion 80b. Here, the third buffer member 73 is provided with a notch 86 that avoids the support shafts 15 a and 15 b of the substrate 11. By providing the notch portion 86, as shown in FIG. 7, the width W3 in the Y direction of the third portion 80c is the width W1 in the Y direction of the first portion 80a and the width W2 in the Y direction of the second portion 80b. Thinner than. For this reason, the third portion 80c can be elastically deformed with a smaller external force than the first portion 80a or the second portion 80b. In other words, the plate member 80 includes a third portion 80c that is relatively elastically deformable. The third portion 80c connects the first portion 80a and the second portion 80b by passing between the support shafts 15a and 15b of the substrate 11 and the first end portion 11a of the substrate 11.

Next, the front curtain buffer 81 and the rear curtain buffer 82 will be described.
The front curtain buffer 81 is a contact part (contact receiving part) with which at least one of the front curtain 25A, the drive arms 31a and 32a, and the front curtain drive lever 41A abuts. In the present embodiment, the drive curtain 32 a connected to the front curtain 25 </ b> A contacts the front curtain buffer 81.

  As shown in FIG. 5, the front curtain buffer 81 is a protrusion provided on the plate member 80. The front curtain buffer 81 is, for example, a metal cylindrical pin, and is fixed to the plate member 80 by caulking. The front curtain buffer 81 protrudes from the plate member 80 in the Z direction. For example, the front curtain buffer 81 is provided between the two drive arms 31a and 32a connected to the front curtain 25A. When the front curtain 25A moves to the end of its moving range, the drive curtain 32a connected to the front curtain 25A comes into contact with the front curtain buffer 81.

  Here, the drive arm 32a includes a base end portion 91 supported by the support shaft 15a, a connecting portion 92 connected to the front curtain 25A, and an intermediate portion 93 extending between the base end portion 91 and the connecting portion 92. And have. The intermediate portion 93 is an example of “a portion between the base end portion and the connecting portion”. In the present embodiment, when the front curtain 25 </ b> A moves to the end of its moving range, the intermediate portion 93 of the drive arm 32 a comes into contact with the front curtain buffer 81.

  On the other hand, the rear curtain buffer 82 is a contact part (contact receiving part) with which at least one of the rear curtain 25B, the drive arms 31b and 32b, and the rear curtain drive lever 41B comes into contact. In the present embodiment, the drive curtain 31b connected to the rear curtain 25B contacts the rear curtain buffer 82.

  The rear curtain buffer 82 is a protrusion provided on the plate member 80, as with the front curtain buffer 81. The rear curtain buffer 82 is, for example, a metal cylindrical pin, and is fixed to the plate member 80 by caulking. The rear curtain buffering portion 82 protrudes from the plate member 80 in the Z direction. For example, the rear curtain buffer 82 is provided between the two drive arms 31b and 32b coupled to the rear curtain 25B. When the rear curtain 25B moves to the end of its moving range, the driving arm 31b connected to the rear curtain 25B comes into contact with the rear curtain buffer 82.

  Here, the drive arm 31b includes a base end portion 91 supported by the support shaft 14b, a connecting portion 92 connected to the rear curtain 25B, and an intermediate portion 93 extending between the base end portion 91 and the connecting portion 92. And have. The intermediate portion 93 is an example of “a portion between the base end portion 91 and the connecting portion 92”. In the present embodiment, when the rear curtain 25B moves to the end of its movement range, the intermediate part 93 of the drive arm 31b contacts the rear curtain buffer part 82.

  As described above, in the third buffer member 73 of the present embodiment, both the front curtain buffer portion 81 and the rear curtain buffer portion 82 are provided on one plate member 80. That is, the buffer member for the front curtain 25A and the buffer member for the rear curtain 25B are formed by one component.

Next, the operation 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 unillustrated set lever is fixed at the initial position, the front curtain 25A is in the unfolded state, and the rear curtain 25B is in the retracted state. In this initial state, the iron pieces of the front curtain drive lever 41A and the rear curtain drive lever 41B abut against the electromagnets 51A and 51B, respectively, and are set at initial positions where they can be attracted to the electromagnets 51A and 51B.

  When photographing, when the release button of the optical device 1 is pressed, the coils of the electromagnets 51A and 51B are energized. When the coils of the electromagnets 51A and 51B are energized, the iron piece of the front curtain drive lever 41A is attracted to the electromagnet 51A, and the iron piece of the rear curtain drive lever 41B is attracted to the electromagnet 51B. Thereafter, the set lever retracts from the front curtain drive lever 41A and the rear curtain drive lever 41B. The front curtain drive lever 41A and the rear curtain drive lever 41B are held while being attracted to the electromagnets 51A and 51B, respectively.

  Thereafter, when the energization of the coil of the electromagnet 51A is cut off, as shown in FIG. 3, the front curtain drive lever 41A rotates counterclockwise in the drawing according to the urging force of the spring 61A. As a result, the front curtain 25A is retracted from the opening 12 and is in the stored state. On the other hand, the rear curtain 25B is maintained in the retracted state retracted from the opening 12 by maintaining energization of the coil of the electromagnet 51B for a predetermined time. As a result, the opening 12 is in an open state (exposure state).

  Energization of the coil of the electromagnet 51B is cut off after a predetermined time has elapsed since the release button was pressed. When the energization of the coil of the electromagnet 51B is interrupted, the trailing curtain drive lever 41B rotates counterclockwise by the biasing force of the spring 61B. Thereby, as shown in FIG. 4, the rear curtain 25 </ b> B expands to close the opening 12. In this way, one shooting is completed.

  Next, the front-curtain drive lever 41A and the rear-curtain drive lever 41B are rotated clockwise in the drawing by a set lever (not shown). As a result, the front curtain 25A is expanded to close the opening 12, and the rear curtain 25B is retracted from the opening 12 and returned to the initial state shown in FIG.

  Next, the operation of the first to third buffer members 71, 72, 73 will be described. Regarding the third buffer member 73, for convenience of explanation, the operation when the rear curtain 25B moves will be described first, and the operation when the front curtain 25A moves thereafter will be described.

  As shown in FIG. 4, when the front curtain 25A transitioning from the deployed state to the stowed state reaches the end of its moving range, the drive arm 31a connected to the front curtain 25A is applied to the first buffer member 71. Touch. When the drive arm 31a contacts the first buffer member 71, the elastic member 71a of the first buffer member 71 is elastically deformed in the moving direction (X direction) of the front curtain 25A. Accordingly, the first buffer member 71 generates a braking force for the front curtain 25A and suppresses the bounding of the front curtain 25A.

  As shown in FIG. 2, when the rear curtain 25B that returns from the deployed state to the retracted state reaches the end of its moving range, the drive arm 31b connected to the rear curtain 25B is applied to the second buffer member 72. Touch. When the drive arm 31b contacts the second buffer member 72, the elastic member 72a of the second buffer member 72 is elastically deformed in the moving direction of the rear curtain 25B (the direction opposite to the X direction). As a result, the second buffer member 72 generates a braking force against the movement of the rear curtain 25B and suppresses the bounce of the rear curtain 25B.

As shown in FIG. 4, the rear curtain cushioning portion 82 of the third cushioning member 73 is connected to the rear curtain 25B when the rear curtain 25B transitioning from the stored state to the deployed state reaches the end of its moving range. The drive arm 31b comes into contact. Here, as shown in FIG. 7, the plate member 80 has a gap S between the plate member 80 and the support shaft 14 b of the substrate 11. Therefore, when the drive arm 31b comes into contact with the rear curtain buffer portion 82, as shown in FIG. 8, a part of the plate member 80 (for example, the second portion 80b) is applied by the force applied by the drive arm 31b to the rear curtain buffer portion 82. ) Moves relative to the support shaft 14b. For example, a part of the plate member 80 moves toward the first portion 80a of the plate member 80 (that is, toward the support shaft 14a that fixes the first portion 80a). Accordingly, a part of the plate member 80 positioned between the support shaft 14a and the rear curtain buffer portion 82 (in other words, a part of the plate member 80 positioned between the support shaft 14a and the support shaft 14b, for example, the first The three parts 80c) receive a force in the compression direction from both sides. As a result, at least a part of the plate member 80 is deformed so as to bend in the Z direction between the rear curtain cushioning portion 82 and the support shaft 14a (see FIG. 8). One side of the plate member 80 is supported by a support surface 11 s of the substrate 11. Therefore, the plate member 80 bends in a direction away from the support surface 11 s of the substrate 11. The third buffer member 73 is deformed so as to bend in the Z direction, thereby generating a braking force for the rear curtain 25B and suppressing the bounce of the rear curtain 25B.
Further, when both the drive arm 31b and the rear curtain buffer portion 82 are made of metal, mechanical metal noise can be generated by the drive arm 31b coming into contact with the rear curtain buffer portion 82. Such a metallic sound can produce a high-class feeling of the focal plane shutter 10 and the optical device 1.

Further, as shown in FIG. 4, the front curtain cushioning portion 81 of the third cushioning member 73 has a front curtain 25A which is moved to the front curtain 25A when the front curtain 25A transitioning from the expanded state to the retracted state reaches the end of its moving range. The connected drive arm 32a abuts. Also in this case, a part of the plate member 80 is moved with respect to the support shaft 14b by the force applied by the drive arm 32a to the front curtain buffer 81, as in the case where the drive arm 31b contacts the rear curtain buffer 82. Thereby, a part of the plate member 80 located between the front curtain buffer part 81 and the support shaft 14a receives a force in the compression direction from both sides. As a result, at least a part of the plate member 80 is deformed so as to be bent in the Z direction between the front curtain buffer portion 81 and the support shaft 14a. The third buffer member 73 is deformed so as to bend in the Z direction, thereby generating a braking force against the front curtain 25A and suppressing the bounce of the front curtain 25A.
Further, when both the drive arm 32a and the front curtain buffer 81 are made of metal, a mechanical metal sound can be generated by the drive arm 32a contacting the front curtain buffer 81. Such a metallic sound can produce a high-class feeling of the focal plane shutter 10 and the optical device 1.

  According to the above configuration, it is possible to provide the focal plane shutter 10 and the optical device 1 that can improve the braking force.

  That is, the focal plane shutter 10 of the present embodiment includes a substrate 11 having an opening 12, an arm 31 that is swingably supported by the substrate 11, and a curtain 25 that is connected to the arm 31 and can open and close the opening 12. And a cushioning member 73 with which the arm 31 comes into contact when the curtain 25 moves to the end of the movement range of the curtain 25. The buffer member 73 is supported with a clearance S between the buffer member 73 and the positioning portion (support shaft 14 b) of the substrate 11 that positions the buffer member 73, and the arm 31 abuts against the buffer member 73, thereby It deform | transforms so that it may bend in the direction (Z direction) substantially orthogonal to the plane containing a moving direction of (1).

  According to this configuration, when the curtain 25 moves to the end of the movement range, at least a part of the buffer member 73 bends in a direction substantially perpendicular to the plane including the movement direction of the curtain 25, thereby The brake force for 25 can be applied. Such a buffer member 73 can be formed relatively large because there are less restrictions regarding the installation location compared to a brake structure that applies a braking force by being deformed in the moving direction of the curtain 25. For this reason, according to the said structure, the improvement of the braking force of the focal plane shutter 10 can be aimed at.

  Further, the buffer member 73 as described above can be installed at a position different from a brake structure (for example, the first buffer member 71 and the second buffer member 72) that applies a braking force by being deformed in the moving direction of the curtain 25. is there. For this reason, the buffer member 73 as described above can be additionally provided to the focal plane shutter 10 including the first buffer member 71 and the second buffer member 72. From this point of view, according to the above configuration, the braking force of the focal plane shutter 10 can be improved.

  Further, since the buffer member 73 is a buffer member that is deformed in the Z direction, the buffer member 73 can be arranged along the first end portion 11a instead of the third end portion 11c and the fourth end portion 11d of the substrate 11. That is, the buffer member 73 can be disposed between the blades 21 a to 23 a and 21 b to 23 b and the first end portion 11 a of the substrate 11. According to such a buffer member 73, it is possible to improve the braking force while avoiding an increase in the size of the focal plane shutter 10 as compared with the case where the braking force is increased in the brake structure that is deformed in the moving direction of the curtain 25. it can.

  Further, according to the buffer member 73 of the present embodiment, the braking force can be easily changed by changing the shape, thickness, material, number, etc. of the plate member 80. Also, the braking force can be easily changed by changing the pin diameters, materials, positions, etc. of the leading curtain cushioning portion 81 and the trailing curtain cushioning portion 82. Furthermore, by not providing any one of the front curtain cushioning portion 81 and the rear curtain cushioning portion 82, it is possible to change the case where the brake acts. Thus, according to the above configuration, it is possible to provide a brake structure that facilitates adjustment of the size and how to use the brake.

In the present embodiment, the gap S is formed between the buffer member 73 and the positioning portion (support shaft 14b) in the direction in which the arm 31 contacts the buffer member 73.
According to this configuration, when the arm 31 is in contact with the buffer member 73, the buffer member 73 is easy to move with respect to the positioning portion (support shaft 14 b) of the substrate 11. If the buffer member 73 is easy to move with respect to the positioning portion of the substrate 11, the buffer member 73 is greatly deformed and easily bent. If the buffer member 73 can be greatly deformed and bent, the buffer member 73 can apply a larger braking force. For this reason, according to the said structure, the braking force of the focal plane shutter 10 can further be improved.

  In the present embodiment, the major axis direction of the second hole 85 extends in a direction in which the drive arm 31 b abuts against the rear curtain buffer portion 82. However, the major axis direction of the second hole 85 is not limited to the above example. For example, the major axis direction of the second hole 85 may extend in a direction in which the drive arm 32 a connected to the front curtain 25 </ b> A contacts the front curtain buffer portion 81. When at least one of the front curtain drive lever 41A, the rear curtain drive lever 41B, the front curtain 25A, and the rear curtain 25B is in contact with the third buffer member 73, the major axis direction of the second hole 85 is the third axis direction. You may extend in the direction in which one of the above-mentioned parts contacts the buffer member 73. The gap S formed between the second hole 85 and the support shaft 14 b may be formed in a direction in which at least one of the arm 31, the curtain 25, and the drive lever 41 contacts the buffer member 73.

  FIG. 9 shows one modification of the present embodiment. In the modification shown in FIG. 9, the major axis direction of the second hole 85 is provided substantially parallel to the X direction (that is, the moving direction of the front curtain 25A and the rear curtain 25B). Thus, the direction in which the buffer member 73 moves can be regulated by changing the major axis direction of the second hole 85.

  In the present embodiment, the curtain 25 includes a front curtain 25A and a rear curtain 25B. Arm 31 includes a front curtain arm (drive arms 31a and 32a) connected to front curtain 25A and a rear curtain arm (drive arms 31b and 32b) connected to rear curtain 25B. The buffer member 73 includes a front curtain buffer 81 that contacts the front curtain arm when the front curtain 25A moves to the end of the movement range, and a rear curtain 25B that moves to the end of the movement range. And a rear curtain buffer portion with which the rear curtain arm abuts.

  According to this configuration, when the front curtain 25A moves to the end of the moving range, the front curtain buffer 81 can apply a braking force to the front curtain 25A. Further, when the rear curtain 25B moves to the end of its moving range, the rear curtain cushioning portion 82 can apply a braking force to the rear curtain 25B. Thereby, the braking force with respect to both the front curtain 25A and the rear curtain 25B can be improved.

In the present embodiment, the cushioning member 73 includes a plate member 80 that extends in the moving direction of the curtain 25 and is provided with both the leading curtain cushioning portion 81 and the trailing curtain cushioning portion 82.
According to this configuration, a single brake member 73 can realize a brake structure for both the front curtain 25A and the rear curtain 25B. Such a configuration is advantageous in reducing the size and cost of the focal plane shutter 10.

  In the present embodiment, the buffer member 73 is formed by caulking and fixing the front curtain buffer 81 and the rear curtain buffer 82 that are cylindrical pins to the plate member 80. According to such a buffer member 73, the mold shape can be simplified, and the cost related to the mold can be reduced. Thereby, the initial investment required for manufacturing the buffer member 73 can be kept low.

The arm 31 includes a base end portion supported by the substrate (for example, the base end portion 91 of the drive arms 32a and 31b) and a connection portion connected to the curtain 25 (for example, the connection portion 92 of the drive arms 32a and 31b). And a portion (intermediate portion 93) between the base end portion and the connecting portion in the arm 31 abuts against the buffer member 73.
According to this configuration, it is possible to realize a structure in which the arm 31 and the buffer member 73 are in contact with each other by using a portion between the base end portion and the connecting portion in the arm 31. That is, according to the above configuration, it is possible to realize a structure in which the arm 31 and the buffer member 73 are in contact with each other without providing the arm 31 with a special additional shape for contacting the buffer member 73. According to such a configuration, it is advantageous for downsizing the focal plane shutter 10, and the additional cost required for providing the buffer member 73 can be reduced.

In the present embodiment, the buffer member 73 has a buffer part (for example, a front curtain buffer part 81 and a rear curtain buffer part) with which the arm 31 abuts. The buffer portion is made of metal.
According to this configuration, the arm 31 can be contacted by the metal buffer portion having a relatively high rigidity, so that the durability and life of the focal plane shutter 10 can be improved.

  In the present embodiment, the optical device 1 includes the focal plane shutter 10 so that the braking force can be improved. If the braking force of the optical device 1 can be improved, the speed of the optical device 1 can be further increased.

(Second Embodiment)
Next, the focal plane shutter 10 and the optical apparatus 1 according to the second embodiment will be described. This embodiment is different from the first embodiment in that the drive lever 41 and the curtain 25 abut against the third buffer member 73 in addition to the arm 31. In addition, the other structure of this embodiment is the same as the structure of 1st Embodiment. Therefore, the description of the same part as the first embodiment is omitted.

  FIG. 10 shows a focal plane shutter 10 according to the present embodiment. As shown in FIG. 10, the third buffer member 73 of the present embodiment has a rear curtain buffer portion 82 against which the rear curtain drive lever 41B abuts when the rear curtain 25B moves to the end of the movement range. The buffer member 73 is deformed so as to bend in the Z direction when the rear curtain drive lever 41 </ b> B contacts the rear curtain buffer portion 82. Further, the buffer member 73 may include a rear curtain buffer portion 82 with which the rear curtain 25B comes into contact when the rear curtain 25B moves to the end of the moving range. Further, the buffer member 73 may have a front curtain buffer portion 81 with which the front curtain drive lever 41A abuts when the front curtain 25A moves to the end of the moving range. Further, the buffer member 73 may include a front curtain buffer portion 81 with which the front curtain 25A abuts when the front curtain 25A moves to the end of the moving range.

That is, the rear curtain cushioning portion 82 of the third cushioning member 73 has at least one of the rear curtain 25B, the drive arm 31b, and the rear curtain drive lever 41B when the rear curtain 25B moves to the end of the moving range. One abuts. Further, the front curtain buffer portion 81 of the third buffer member 73 has at least one of the front curtain 25A, the drive arm 32a, and the front curtain drive lever 41A when the front curtain 25A moves to the end of its moving range. One abuts.
In this case, the rear curtain cushioning portion 82 with which at least one of the rear curtain 25B, the drive arm 31b, and the rear curtain drive lever 41B abuts is formed of metal. Similarly, the front curtain buffer portion 81 with which at least one of the front curtain 25A, the drive arm 32a, and the front curtain drive lever 41A abuts is formed of metal.

  Also with the focal plane shutter 10 and the optical apparatus 1 having such a configuration, the braking force can be improved as in the first embodiment.

The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.
For example, the pin diameter, material, position, etc. of the front curtain buffer 81 and the rear curtain buffer 82 are not limited to specific ones. Further, the shape, thickness, material, number, etc. of the plate member 80 are not limited to specific ones. For example, a plurality of plate members 80 may be stacked. For example, desired hardness may be realized by stacking a plurality of plate members 80 having different plate thicknesses. For example, desired hardness may be realized by stacking a plurality of plate members 80 of different materials. For example, desired hardness may be realized by stacking a plurality of plate members 80 having different shapes. The front curtain buffer 81 and the rear curtain buffer 82 may be formed integrally with the plate member 80.

For example, the buffer member 73 may generate a braking force only for the front curtain 25A, or may generate a braking force only for the rear curtain 25B. The buffer member 73 may be provided with a buffer plate that acts on the front curtain 25A and a buffer plate that acts on the rear curtain 25B separately.
In the above-described embodiment, the buffer member 73 that contacts when the front curtain 25A shifts from the expanded state to the retracted state and when the rear curtain 25B shifts from the retracted state to the expanded state has been described. Alternatively, the buffer member 73 may be in contact with the front curtain 25A when it returns from the retracted state to the expanded state, and when the rear curtain 25B returns from the expanded state to the retracted state.

  In the above embodiment, the focal plane shutter 10 is a so-called spring drive system in which exposure is performed by driving the blades 21a to 23a and 21b to 23b by the biasing force of the springs 61A and 61B. However, the focal plane shutter is not limited to the above example. Even if the focal plane shutter is a so-called electromagnetic drive system in which exposure is performed by the driving force of an electromagnetic actuator, the same effect can be obtained by applying the above configuration.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Optical apparatus, 10 ... Focal plane shutter, 11 ... Board | substrate, 12 ... Opening, 25 ... Curtain, 25A ... Front curtain, 25B ... Rear curtain, 31 ... Arm, 31a, 32a ... Drive arm (front curtain arm), 31b 32b ... drive arm (rear curtain arm), 14b ... support shaft (positioning part), 41 ... drive lever, 41A ... front curtain drive lever, 41B ... rear curtain drive lever, 73 ... third buffer member (buffer member), 80: plate member, 81: front curtain cushioning part, 82: rear curtain cushioning part, 91 ... proximal end part, 92 ... coupling part, S ... gap.

Claims (7)

A substrate having an opening;
An arm supported swingably on the substrate;
A curtain connected to the arm and capable of opening and closing the opening;
A drive lever for driving the curtain by swinging a predetermined range;
A buffer member that abuts at least one of the arm, the curtain, and the drive lever when the curtain moves to an end of a movement range of the curtain;
The buffer member is supported with a gap between the buffer member and the positioning portion of the substrate for positioning the buffer member, and at least one of the arm, the curtain, and the drive lever contacts the buffer member. Thus, it is deformed so as to bend in a direction substantially perpendicular to the plane including the moving direction of the curtain ,
The curtain includes a leading curtain and a trailing curtain,
The arm includes a front curtain arm connected to the front curtain, and a rear curtain arm connected to the rear curtain,
The drive lever includes a front curtain drive lever that drives the front curtain, and a rear curtain drive lever that drives the rear curtain,
The buffer member is a front curtain buffer that contacts at least one of the front curtain, the front curtain arm, and the front curtain drive lever when the front curtain moves to an end of a movement range of the front curtain. And a rear curtain buffering portion with which at least one of the rear curtain, the rear curtain arm, and the rear curtain drive lever abuts when the rear curtain moves to the end of the movement range of the rear curtain. Formed by one part including,
This is a focal plane shutter. 2. The focal point according to claim 1, wherein the buffer member is disposed between the front curtain and the rear curtain and one end portion of the substrate in a direction substantially orthogonal to a moving direction of the film. Plain shutter. The buffer member includes a plate member that extends in the moving direction of the curtain and has both the front curtain buffer portion and the rear curtain buffer portion , and is at least one of the arm, the curtain, and the drive lever. 3. The plate member according to claim 1 , wherein the plate member is deformed so as to bend in a direction substantially perpendicular to a plane including a moving direction of the curtain, when one of them abuts against the buffer member . Focal plane shutter. The plate member includes a first portion including a first hole through which a support shaft provided in the substrate is passed, a second portion including a second hole through which the positioning portion is passed, the first portion, and the 4. A third portion provided between the second portion and a third portion having a width in a direction substantially perpendicular to the moving direction of the curtain that is narrower than the first portion and the second portion. The focal plane shutter described in 1.   The arm has a base end portion supported by the substrate and a connecting portion connected to the curtain, and a portion between the base end portion and the connecting portion in the arm is the buffer member. The focal plane shutter according to claim 1, wherein the focal plane shutter is in contact with the focal plane shutter. The focal plane shutter according to any one of claims 1 to 5 , wherein the front curtain buffer section and the rear curtain buffer section are made of metal.   An optical apparatus comprising the focal plane shutter according to any one of claims 1 to 6.

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